Huawei Call Reestablishment RAN14

Call Reestablishment
RAN
Feature Parameter Description
Issue 03
Date 2013-11-30
HUAWEI TECHNOLOGIES CO., LTD.

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WCDMA RAN
Call Reestablishment Contents
Issue 03 (2013-11-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
i
Contents
1 About This Document.................................................................................................................1
1.1 Scope ............................................................................................................................................... 1
1.2 Intended Audience............................................................................................................................ 1
1.3 Change History................................................................................................................................. 1
2 Overview.........................................................................................................................................3
2.1 Introduction....................................................................................................................................... 3
2.2 Benefits ............................................................................................................................................ 3
2.3 Architecture ...................................................................................................................................... 3
3 Uplink RL Failure .........................................................................................................................7
3.1 Uplink RL Failure Detection.............................................................................................................. 7
3.2 Call Reestablishment ....................................................................................................................... 8
3.2.1 Triggering................................................................................................................................. 8
3.2.2 Implementation ...................................................................................................................... 12
4 SRB Reset....................................................................................................................................14
4.1 SRB Reset Detection ..................................................................................................................... 14
4.2 Call Reestablishment ..................................................................................................................... 16
5 TRB Reset....................................................................................................................................17
5.2 TRB Reset Detection...................................................................................................................... 17
6 Air-Interface Process Overlap ................................................................................................19
6.1 Air-Interface Process Overlap Detection........................................................................................ 19
6.1.1 Scenario 1 ............................................................................................................................. 19
6.1.2 Scenario 2 ............................................................................................................................. 22
7 Air-Interface Process Timeout................................................................................................25
7.1 Air-Interface Process Timeout Detection........................................................................................ 25
7.1.1 Radio Bearer Setup Timeout ................................................................................................. 25
7.1.2 Physical Channel Reconfiguration Timeout........................................................................... 26
8 Related Features........................................................................................................................29
8.1 Prerequisite Features..................................................................................................................... 29
8.2 Mutually Exclusive Features .......................................................................................................... 29
8.3 Impacted Features ......................................................................................................................... 29
9 Network Impact...........................................................................................................................30
9.1 System Capacity ............................................................................................................................ 30
9.2 Network Performance .................................................................................................................... 30

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Call Reestablishment Contents
ii
10 Implementation.........................................................................................................................31
10.1 When to Use Call Reestablishment ............................................................................................. 31
10.2 Required Information.................................................................................................................... 31
10.3 Planning ....................................................................................................................................... 31
10.4 Deploying Call Reestablishment .................................................................................................. 31
10.4.1 Requirements ...................................................................................................................... 31
10.4.2 Data Preparation ................................................................................................................. 31
10.4.3 Function Activation .............................................................................................................. 34
10.4.4 MML Command Example .................................................................................................... 36
10.4.5 Activation Observation......................................................................................................... 36
10.4.6 Deactivation......................................................................................................................... 36
10.4.7 MML Command Example.................................................................................................... 37
10.5 Performance Monitoring............................................................................................................... 37
10.6 Parameter Optimization ............................................................................................................... 38
10.7 Troubleshooting............................................................................................................................ 38
11 Parameters.................................................................................................................................39
12 Counters.....................................................................................................................................72
13 Glossary.....................................................................................................................................73
14 Reference Documents............................................................................................................74

WCDMA RAN
Call Reestablishment 1 About This Document
1
1 About This Document
1.1 Scope
This document describes the WRFD-140103 Call Reestablishment, including its technical principles,
related features, network impact, and engineering guidelines.
1.2 Intended Audience
This document is intended for personnel who:
 Need to understand the features described herein
 Work with Huawei products
1.3 Change History
This section provides information about the changes in different document versions. There are two types
of changes, which are defined as follows:
 Feature change
Changes in features of a specific product version
 Editorial change
Changes in wording or addition of information that was not described in the earlier version
03 (2013-11-30)
This issue includes the following changes.
Change
Type
Change Description Parameter Change
Feature
change
None None
Editorial
change
Optimized the figures of Figure 6-1 and
Figure 6-2.
None
02 (2013-06-20)
This issue includes the following changes.
Change
Type
Change Description Parameter Change
Feature
change
None None
Editorial
change
Added 6 Air-Interface Process Overlap
Added 7 Air-Interface Process Timeout
Added the processing of physical
channel reconfiguration in 6 Air-Interface
Process Overlap
None

WCDMA RAN
Call Reestablishment 1 About This Document
2
01 (2012-11-30)
This document is created for RAN14.0.

WCDMA RAN
Call Reestablishment 2 Overview
3
2 Overview
2.1 Introduction
Call reestablishment is a function by which radio links (RLs) are reestablished when a service
interruption or an access failure occurs in temporary coverage holes and in tunnels, elevators, and
buildings that cause significant signal quality fluctuation.
Call reestablishment can be initiated by a UE or the RAN.
 Call reestablishment initiated by a UE: The UE sends a call reestablishment request to the network to
restore services upon detecting a downlink RL failure or a signaling radio bearer (SRB) reset.
 Call reestablishment initiated by the RAN: The RAN informs the UE to start call reestablishment upon
detecting a service interruption or an access failure.
This document describes only call reestablishment initiated by the RAN.
2.2 Benefits
The RAN detects a service interruption or an access failure before a UE does and stops downlink power
transmission to initiate call reestablishment. Call reestablishment improves user experience by
increasing the radio access bearer (RAB) setup success rate and reducing the call drop rate.
2.3 Architecture
The possible causes of a service interruption or an access failure are as follows:
 RL failure
 SRB reset
 Air-interface process overlap
 Air-interface process overlap
 PS TRB reset
These causes can impact the following processes: active set update, physical channel reconfiguration,
RB setup, SRB reconfiguration during dynamic channel configuration control (DCCC), and measurement
control.
Before releasing RLs due to the preceding causes in those processes, the RAN detects the service
interruption or access failure and initiates call reestablishment, as shown in Figure 2-1.

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4
Figure 2-1 Causes and processes that trigger call reestablishment
RL failure can trigger call reestablishment even if the processes in Figure 2-1 are not active. RB reset, air-interface
process overlap, TRB reset and air-interface process timeout must occur in one of the processes before call
reestablishment is triggered.
Call reestablishment is controlled by service switch, process switch, and cause switch parameters.
Enable the corresponding service switch before enabling a process switch or a cause switch.
Table 2-1 shows the signaling messages and causes for call reestablishment.
Table 2-1 Switch parameter mapping
Service Process Cause
CS
services Active set update
SRB reset
RL failure
Measurement control SRB reset
Physical channel reconfiguration during a hard
handover
SRB reset
RL failure
Physical channel reconfiguration in
compressed mode
SRB reset
RL failure
Radio bearer reconfiguration SRB reset
RL failure
Air-interface process timeout
Air-interface process overlap

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5
Physical channel reconfiguration during a
serving cell update
SRB reset
RL failure
Physical channel reconfiguration for inter
RNC-UE timer relationship adjustment when a
UE reports event 6G or 6F
SRB reset
RL failure
RB setup
SRB reset
PS
services
Active set update
SRB reset
RL failure
Measurement control
SRB reset
RL failure
RB setup
SRB reset
RB reconfiguration during DCCC
SRB reset
RL failure
PS TRB Reset None
Physical channel reconfiguration during a hard
handover
SRB reset
RL failure
Physical channel reconfiguration in
compressed mode
SRB reset
RL failure

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6
Physical channel reconfiguration during
HSUPA power adjustment
SRB reset
RL failure
Physical channel reconfiguration for inter
RNC-UE timer relationship adjustment when a
UE reports event 6G or 6F
SRB reset
RL failure
Physical channel reconfiguration during a
serving cell change
SRB reset
RL failure
The active set update and measurement control processes do not have process switch parameters.

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Call Reestablishment 3 Uplink RL Failure
7
3 Uplink RL Failure
3.1 Uplink RL Failure Detection
The NodeB monitors uplink RL quality. If the number of "out-sync" indications received by the NodeB
reaches the value of the NOUTSYNCIND parameter, the NodeB starts the TRlFailure timer. The
detection process continues according to the situation:
 If the number of "in-sync" indications received by the NodeB reaches the value of the NINSYNCIND
parameter before the TRlFailure timer expires, the NodeB stops and resets the TRlFailure timer.
 If the number of "in-sync" indications received by the NodeB does not reach the value of the
NINSYNCIND parameter before the TRlFailure timer expires, the NodeB considers that an RL failure
has occurred and identifies the RL set where the failure is located. (An RL set contains all the RLs of a
UE under a NodeB.)
The higher the value of the NOUTSYNCIND parameter, the harder it will be for RL failures to be triggered. The higher the
value of the NINSYNCIND parameter, the harder it will be for RLs to be synchronized. If either parameter is set to a high
value, RLs will be on the verge of RL failure for a long time, and user experience will be poor for both CS and PS services.
Set NOUTSYNCIND to a value less than the default and NINSYNCIND to a value higher than the default. This way, RL
failures are easily triggered for call reestablishment to improve user experience.
The default value of NOUTSYNCIND is 50 and NINSYNCIND is 5.
When a UE's uplink RL sets are all out of synchronization, different events occur according to the
situation:
 If the call reestablishment feature is not enabled, the call drops or the UE access finally fails.
 If the call reestablishment feature is enabled, the RNC activates a synchronization timer.
Table 3-1 shows the mapping between services, RsvdPara1:RSVDBIT1_BIT28 switch status, and
synchronization timers.
Table 3-1 Mapping between services, RsvdPara1:RSVDBIT1_BIT28 switch status, and synchronization
timers
Service RsvdPara1:RSVDBIT1_BIT28 Switch Status Synchronization Timer
CS
services
Off RlRstrTmr
On T313
PS
services
Off RlRstrTmr
On RlRstrTmr
If the NodeB does not detect uplink RL synchronization before the timer expires, call reestablishment is
initiated.
Enable the RsvdPara1:RSVDBIT1_BIT28 switch for CS services so that uplink and downlink RLs are monitored by the
same synchronization timer.
When the RsvdPara1:RSVDBIT1_BIT28 switch is enabled, the synchronization timer used to initiate RL establishment is
RlRstrTmr. The T313 timer is used only when the UE's RL sets are all out of synchronization.

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8
To enable the call reestablishment feature triggered by an RL failure, enable the corresponding service
and cause switches listed in Table 3-2.
Table 3-2 Switches for call reestablishment triggered by an RL failure
Service Service Switch Process Switch Cause Switch
CS services RsvdPara1:RSVD
BIT1_BIT24
Physical channel reconfiguration
is controlled by
PROCESSSWITCH4:PHY_RECF
G_REEST_SWITCH.
RB reconfiguration is controlled by
PROCESSSWITCH4:RB_RECFG
_RL_REEST_SWITCH.
RsvdPara1:RSVDBIT1_BI
T23
PS services RsvdPara1:RSVD
BIT1_BIT25
RL failures can trigger call reestablishment without enabling process switches.
The service switch for CS+PS combined services is the same as that for CS services.
When call reestablishment is triggered for CS+PS combined services, calls are reestablished for both CS and PS
services.
3.2 Call Reestablishment
3.2.1 Triggering
Call reestablishment triggered by an uplink RL failure can be performed under the same RNC or under
different RNCs over the Iur interface.
Under the Same RNC
As mentioned in section 3.1 "Uplink RL Failure Detection", if the NodeB does not detect uplink RL
synchronization before the RlRstrTmr or T313 timer expires, the RNC sends to the NodeB the Radio
Link Activation Command message containing the information element (IE) "deactivate." Upon receiving
the message, the NodeB stops downlink power transmission for the UE's RL sets. Then, the RNC starts
the timer for call reestablishment (RsvdPara2 timer for CS services and RsvdPara3 timer for PS
services).
 If the RNC does not receive the Cell Update message from the UE before the timer expires, the call
drops or UE access fails.
 If the RNC receives the Cell Update message from the UE before the timer expires, the RNC stops the
timer and initiates call reestablishment.
Figure 3-1 shows the signaling procedure for call reestablishment triggered by an uplink RL failure under
the same RNC.

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9
Figure 3-1 Call reestablishment triggered by an uplink RL failure under the same RNC

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Under Different RNCs over the Iur Interface
Call reestablishment under different RNCs is controlled by the
PROCESSSWITCH4:.IUR_RL_REEST_SWITCH.
Figure 3-2 shows the signaling procedure for call reestablishment triggered by an uplink RL failure under
different RNCs over the Iur interface.

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Figure 3-2 Call reestablishment triggered by an uplink RL failure under different RNCs over the Iur interface
The difference between call reestablishment triggered by an uplink RL failure under the same RNC and
that triggered by an uplink RL failure under different RNCs is summarized as follows:
 In the former process, the RNC sends the Radio Link Activation Command to the NodeB.

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12
 In the latter process, the SRNC sends the Radio Link Deletion Request message to the DRNC, and
upon receiving the Radio Link Deletion Response message from the NodeB, the DRNC waits for the
UE's Cell Update message.
3.2.2 Implementation
The call reestablishment process is implemented as follows:
1. After the NodeB stops downlink power transmission for a UE's RLs, the UE starts the T313 timer if
the number of "out-sync" indications received consecutively from Layer 1 reaches the value of the
N313 parameter.
The higher the value of the N313 parameter, the harder it will be for the UE to detect an RL failure and the longer the UE
stays on the verge of RL failure.
2. If the number of "in-sync" indications received consecutively from Layer 1 does not reach the value of
the N315 parameter before the T313 timer expires, the UE transmits the Cell Update message with
the cause value "Radio Link Failure" to the RNC for call reestablishment. Meanwhile, the UE starts
the T302 timer as well as the T314 timer for CS services or the T315 timer for PS services.
3. If the UE does not receive the Cell Update Confirm message from the RAN side after the T302 timer
expires, the UE retransmits the Cell Update message until the T314/T315 timer expires: (The number
of retransmissions is determined by the value of the N302 parameter.)
 If faulty RLs are restored before T314/T315 expires, the call reestablishment is successful. Interrupted
services are restored or UE access succeeds.
 If faulty RLs are not restored before T314/T315 expires, the call reestablishment fails. Services are
released or UE access fails.
Set the T313, N313, N315, and T314 parameters appropriately so that UEs can quickly detect RL failures.
Figure 3-3 shows how call establishment is implemented.

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Figure 3-3 Flowchart for call reestablishment

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Call Reestablishment 4 SRB Reset
14
4 SRB Reset
Figure 4-1 shows the signaling procedure for call reestablishment triggered by an SRB reset.
Figure 4-1 Call reestablishment triggered by an SRB reset
4.1 SRB Reset Detection
The RNC sends a message in acknowledged mode (AM) to a UE. However, the RNC does not receive a
response from the UE before the number of SRB RLC PDU retransmissions reaches the value of the

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15
NoDiscardMaxDAT parameter. If the AMRlcDiscardMode parameter is set to NO_DISCARD, the RNC
triggers an SRB reset and sends the Reset PDU message to the UE to reestablish RLC entities on both
sides. Then one of the following occurs:
 If the call reestablishment feature is not enabled, the RNC sends the Iu Release Request message to
the core network.
 If the call reestablishment feature is enabled, call reestablishment is triggered.
To enable the call reestablishment feature triggered by an SRB reset, enable the corresponding service,
process, and cause switches listed in Table 4-1.
Table 4-1 Switches for call reestablishment triggered by an SRB reset
Service Service Switch Process Cause Switch
CS
services
RsvdPara1:RSVD
BIT1_BIT24
Physical channel reconfiguration is
controlled by
PROCESSSWITCH4:PHY_RECFG_REE
ST_SWITCH.
RB setup is controlled by
PROCESSSWITCH4:RB_SETUP_RL_RE
EST_SWITCH.
RB reconfiguration is controlled by
ReservedSwitch1:RESERVED_SWITCH
_1_BIT14.
NOTE
RB reconfiguration applies to a single PS
service or to services combined with a PS
service.
RsvdPara1:RSVDB
IT1_BIT22
PS
services
RsvdPara1:RSVD
BIT1_BIT25
services.
After you enable the process switch, change the length of the corresponding process timer so that call
reestablishment is more likely to be triggered by an SRB reset. Table 4-2 shows the mapping between
processes and timers.
Table 4-2 Mapping between processes and timers
Process Timer
Active set update HoAsuTmr
Physical channel reconfiguration HoPhychRecfgTmr
RB setup RbSetupRspTmr
SRB reconfiguration during dynamic channel
configuration control (DCCC)
RbRecfgRspTmr

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The process of call reestablishment triggered by an SRB reset is the same as that triggered by an RL
failure. For details, see section 3.2 "Call Reestablishment."

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Call Reestablishment 5 TRB Reset
17
5 TRB Reset
Figure 5-1 shows the signaling procedure for call reestablishment triggered by a TRB reset.
Figure 5-1 Call reestablishment triggered by a TRB reset
5.2 TRB Reset Detection
The RNC sends an AM PDU to a UE initiating PS services in the CELL_DCH state. If the RNC does not
receive a response from the UE, a TRB reset is triggered. Then one of the following occurs:

WCDMA RAN
Call Reestablishment 5 TRB Reset
18
the core network and the UE's PS services are interrupted.
 If the call reestablishment feature is enabled, the RNC does not send the Iu Release Request
message to the core network and call reestablishment is triggered. After the call reestablishment, the
UE is still in the CELL_DCH state.
To enable the call reestablishment feature in this scenario, enable the service and process switches
listed in the following table.
Table 5-1 Switches for call reestablishment triggered by a TRB reset
Service Switch Process Switch Cause
Switch
The PS service is controlled by
RsvdPara1:RSVDBIT1_BIT25
in the SET URRCTRLSWITCH
command. When RsvdPara1 is
set to RSVDBIT1_BIT25-0, the
switch for PS service is enabled.
PDU sending is controlled by SET
UCORRMPARA:ReservedSwitch
1: RESERVED_SWITCH_1_BIT26
None
Call reestablishment triggered by a TRB reset applies only to a single PS service of a UE in the CELL_DCH state.
The process of call reestablishment triggered by a TRB reset is the same as that triggered by an RL
failure. For details, see 3.2 Call Reestablishment.

WCDMA RAN
Call Reestablishment 6 Air-Interface Process Overlap
19
6 Air-Interface Process Overlap
Air-interface process overlap occurs in the following scenarios:
 Scenario 1: The RNC sends the Radio Bearer Setup or Radio Bearer Reconfiguration or Physical
Channel Reconfiguratio message to a UE. If the RNC does not receive a response from the UE before
the RlRstrTmr or T313 timer expires, the RNC initiates call reestablishment for the UE.
 Scenario 2: After sending the Radio Bearer Setup or Radio Bearer Reconfiguration message or
Physical Channel Reconfiguratio to a UE, the RNC receives the Cell Update message containing the
cause value "Radio Link Failure" or “Rlc_Unrecoverable_Error”from the UE.
If the RNC receives the Cell Update message containing the cause value "RLC Unrecoverable Error" from the UE, only
the RsvdPara1:RSVDBIT1_BIT26 switch needs to be enabled to perform call reestablishment.
6.1 Air-Interface Process Overlap Detection
6.1.1 Scenario 1
The RNC sends the Radio Bearer Setup or Radio Bearer Reconfiguration message or Physical Channel
Reconfiguration to a UE. If the RNC does not receive a response from the UE before the RlRstrTmr or
T313 timer expires, the RNC initiates call reestablishment for the UE. Figure 6-1 shows the procedure for
scenario 1.
For details about whether to use RlRstrTmr or T313, see section 3.1 "Uplink RL Failure Detection."

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Figure 6-1 Call reestablishment triggered by air-interface process overlap in scenario 1
To enable the call reestablishment feature for scenario 1, enable the corresponding service, process,
and cause switches listed in Table 6-1 and Table 6-2.
Table 6-1 lists the switches for call reestablishment triggered when the RNC does not receive ACK of the
Radio Bearer Setup message from the UE.
Table 6-1 Switches for call reestablishment triggered when the RNC does not receive ACK of the Radio
Bearer Setup message from the UE
Service Service Switch Process Process Switch Cause Switch
CS services RsvdPara1:RS
VDBIT1_BIT24
RB setup PROCESSSWITC
H4:RB_SETUP_R
T23

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PS services RsvdPara1:RS
VDBIT1_BIT25
L_REEST_SWITC
H
services.
Radio Bearer Reconfiguration message from the UE.
Bearer Reconfiguration message from the UE
Service Service
Switch
Process Process Switch Cause Switch
Single PS
service
RsvdPara1:
RSVDBIT1_
BIT25
RB reconfiguration ReservedSwitch1:RESER
VED_SWITCH_1_BIT14
RsvdPara1:RSVD
BIT1_BIT23
CS+PS
combined
services
RsvdPara1:
RSVDBIT1_
BIT24
services.
The following table lists the switches for call reestablishment triggered when the RNC does not receive
ACK of the Physical Channel Reconfiguration Complete message for a single PS service.
Table 6-3 Switches for call reestablishment triggered when the RNC does not receive ACK of Physical
Channel Reconfiguration Complete message for a single PS service
PS services RsvdPara1:RSVDBIT1_BI
T25
The
PHY_RECFG_REEST_SW
ITCH under the
PROCESSSWITCH4
parameter controls whether
call reestablishment can be
triggered when physical
channel reconfiguration
overlaps cell update.
T23
The following table lists the switches for call reestablishment triggered when the RNC does not receive
ACK of the Physical Channel Reconfiguration Complete message for CS+PS combined services.

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Table 6-4 Switches for call reestablishment triggered when the UE does not send the RNC a Physical
Channel Reconfiguration Complete message for CS+PS combined service
CS+PS combined
services
RsvdPara1:RSVDBIT1
_BIT24
The
PHY_RECFG_REEST_
SWITCH under the
PROCESSSWITCH4
parameter controls
whether call
reestablishment can be
triggered when physical
overlaps cell update.
RsvdPara1:RSVDBIT1
_BIT23
services.
6.1.2 Scenario 2
After sending the Radio Bearer Setup or Radio Bearer Reconfiguration message to a UE, the RNC
receives the Cell Update message containing the cause value "Radio Link Failure" or “RLC
Unrecoverable error” from the UE. Then one of the following occurs:
 If the call reestablishment feature is not enabled, the call drops or UE access fails.
 If the call reestablishment feature is enabled, the RNC initiates call reestablishment, as shown in
Figure 6-2.

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Figure 6-2 Call reestablishment triggered by air-interface process overlap in scenario 2
The RNC does not send the Radio Link Activation Command message containing the "deactivate" IE to the NodeB.
Therefore, the NodeB does not stop downlink power transmission for the UE's RL sets. Instead, the RNC initiates call
reestablishment upon receiving the Cell Update message from the UE.
To enable the call reestablishment feature for scenario 2, enable the corresponding service, process,
and cause switches listed in Table 6-5 and Table 6-6.
Radio Bearer Setup message from the UE in scenario 2.
Bearer Setup message from the UE
RB setup PROCESSSWITCH4:RB_SETUP_RL_REEST_SWITCH None
services.

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Radio Bearer Reconfiguration message from the UE in scenario 2.
Bearer Reconfiguration message from the UE (PS or CS+PS)
RB reconfiguration ReservedSwitch1:RESERVED_SWITCH_1_BIT14
and SET UCORRMPARA: ReservedSwitch1:
RESERVED_SWITCH_1_BIT20
None
services.
Table 6-7 Switches for call reestablishment triggered when the RNC does not receive ACK of the Physical
Channel Reconfiguration message from the UE (PS or CS+PS)
Physical Channel
Reconfiguration
ProcessSwitch4: PHY_RECFG_REEST_SWITCH
and SET UCORRMPARA: ReservedSwitch1:
None
services.
The process of call reestablishment triggered by process overlap is the same as that triggered by an RL

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Call Reestablishment 7 Air-Interface Process Timeout
25
7 Air-Interface Process Timeout
7.1 Air-Interface Process Timeout Detection
7.1.1 Radio Bearer Setup Timeout
The RNC sends the Radio Bearer Setup message to a UE. However, the RNC does not receive the
Radio Bearer Setup Complete message from the UE before the RbSetupRspTmr timer expires. Then
either of the following occurs:
the core network and the call drops.
 If the call reestablishment feature is enabled, the RNC does not send the Iu Release Request
message to the core network but initiates call reestablishment, as shown in the following figure.
Figure 7-1 Call reestablishment triggered by radio bearer setup timeout in scenario 1
In this scenario, the call reestablishment feature is controlled by the service switch and process switch,
as described in the following table.
Table 7-1 Switches for call reestablishment triggered by radio bearer setup timeout
Switch
The CS service is controlled by
RsvdPara1:RSVDBIT1_BIT24 in the
SET URRCTRLSWITCH command.
When RsvdPara1 is set to
RB setup is controlled by SET UCORRMPARA:
ReservedSwitch1:RESERVED_SWITCH_1_BIT1
4 and SET UCORRMPARA:ReservedSwitch1=
None

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26
Switch
RSVDBIT1_BIT24-0, the switch for
CS service is enabled.
RESERVED_SWITCH_1_BIT20.
RsvdPara1:RSVDBIT1_BIT25 in the
SET URRCTRLSWITCH command.
When RsvdPara1 is set to
RSVDBIT1_BIT25-0, the switch for
PS service is enabled.
services.
7.1.2 Physical Channel Reconfiguration Timeout
After sending a Physical Channel Reconfiguration message to a UE, the RNC starts a timer whose
length is determined by the HoPhychRecfgTmr parameter that applies to the UMTS BSC6900. If the
RNC does not receive a Physical Channel Reconfiguration Complete message from the UE before the
timer expires, physical channel reconfiguration timeout occurs. Then either of the following occurs:
 If the call reestablishment feature is not enabled, the RNC sends an Iu Release Request message to
the core network and the call drops.
 If the call reestablishment feature is enabled, the RNC does not send an Iu Release Request message
to the core network but initiates call reestablishment, as shown in the following figure.

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Figure 7-2 Call reestablishment triggered by physical channel reconfiguration timeout
The following table lists the switches for call reestablishment triggered by physical channel
reconfiguration timeout.
Table 7-2 Switches for call reestablishment triggered by physical channel reconfiguration timeout
Service Switch Process Switch Cause Switch
The CS service is controlled by
RsvdPara1:RSVDBIT1_BIT24 in
the SET URRCTRLSWITCH
switch for CS service is enabled.
The PHY_RECFG_REEST_SWITCH under the
PROCESSSWITCH4 parameter and SET
CORRMPARA :ReservedSwitch1:
RESERVED_SWITCH_1_BIT19 control whether
call reestablishment can be triggered by physical
channel reconfiguration timeout. Call
reestablishment can be triggered by physical
channel reconfiguration timeout only when these
two switches are turned on.
None
RsvdPara1:RSVDBIT1_BIT25 in
the SET URRCTRLSWITCH
switch for PS service is enabled.

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28
services.
The process of call reestablishment triggered by process overlap is the same as that triggered by an RL

WCDMA RAN
Call Reestablishment 8 Related Features
29
8 Related Features
8.1 Prerequisite Features
None
8.2 Mutually Exclusive Features
None
8.3 Impacted Features
None

WCDMA RAN
Call Reestablishment 9 Network Impact
30
9 Network Impact
9.1 System Capacity
None
9.2 Network Performance
When the call reestablishment feature is enabled in scenarios with weak coverage or significant signal
fluctuation, calls will be reestablished for UEs with service interruptions or access failures that are
caused by link failures or control/user plane faults. As a result, the call drop rate decreases and the UE
access success rate increases. The exact gains depend on the coverage of the live network.
When a UE service is interrupted or the UE access fails, channel element (CE), code resources, and
power resources are released for the UE. After call reestablishment succeeds, the released resources
are re-occupied by the UE.
The call reestablishment feature:
 Generally interrupts CS services for at least 8 seconds
 Does not affect network KPIs
 Affects CS user experience
 Slightly affects non-real-time PS user experience

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Call Reestablishment 10 Implementation
31
10 Implementation
10.1 When to Use Call Reestablishment
Use call reestablishment in temporary coverage holes and in tunnels, elevators, and buildings that cause
significant radio signal fluctuation.
10.2 Required Information
Before you enable this function, collect the following information:
 Causes of call drops or access failures and the number and proportion of times that UEs are involved
in the processes performed over the air interface
 Whether the Iur interface is configured with and supports common channels
To support the call reestablishment feature under different RNCs, the Iur interface must support
common channels.
10.3 Planning
None
10.4 Deploying Call Reestablishment
10.4.1 Requirements
None
10.4.2 Data Preparation
Parameter
Name
Parameter ID Remarks Data Source
Timer 302 T302 Set this parameter based on network
conditions. Otherwise, network performance
will be greatly affected. The recommended
value is 2s.
Radio network
plan (internal)
Constant 302 N302 Set this parameter based on network
value is 3.
Radio network
plan (internal)
value is 3s.
Default
value/recomme
nded value
will be greatly affected. The higher the value
of this parameter, the harder it will be for the
UE to detect an RL failure and the longer the
UE stays on the verge of RL failure. The
recommended value is 20.
Radio network
plan (internal)

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32
Parameter
Name
value is 1.
Radio network
plan (internal)
value is 8s.
Radio network
plan (internal)
value is 10s.
Radio network
plan (internal)
Num of
Continuous
Out of Sync
Ind
NoutsyncInd Set this parameter based on network
will be greatly affected. The lower the value
of this parameter, the earlier call
reestablishment is triggered by an RL failure.
The recommended value is 50, but you can
set this parameter to a value even lower than
the recommended value to improve user
experience.
Radio network
plan (internal)
Num of
Continuous in
Sync Ind
NInsyncInd Set this parameter based on network
will be greatly affected. The higher the value
of this parameter, the earlier call
reestablishment is triggered by an RL failure.
The recommended value is 5, but you can
set this parameter to a value even higher
than the recommended value to improve
user experience.
Radio network
plan (internal)
Radio Link
Failure Timer
Length
TRlFailure Set this parameter based on network
value is 5s.
Radio network
plan (internal)
Reserved
parameter 2
RsvdPara2 Timer for call reestablishment for CS
services.
Set this parameter based on network
value is 15000.
Radio network
plan (internal)
Reserved
parameter 3
RsvdPara3 Timer for call reestablishment for PS
services.
Set this parameter based on network
value is 35000.
Radio network
plan (internal)

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Parameter
Name
Reserved
parameter 1
RsvdPara1:RSVD
BIT1_BIT22
Switch that controls call reestablishment
triggered by SRB resets
Determine whether to enable this switch by
referring to section 10.2 "Required
Information."
Radio network
plan (internal)
Reserved
parameter 1
RsvdPara1:RSVD
BIT1_BIT23
caused by RL failures. Determine whether to
enable this switch by referring to section 10.2
"Required Information."
Radio network
plan (internal)
CORRM
Algorithm
Reserved
Switch 1
ReservedSwitch1
:RESERVED_SWI
TCH_1_BIT14
caused by RB reconfiguration during DCCC.
Information."
Default
value/recomme
nded value
Process
Control
Switch 4
PROCESSSWITC
H4:RB_SETUP_R
L_REEST_SWITC
H
caused by process overlap.
Information."
Default
value/recomme
nded value
Process
Control
Switch 4
PROCESSSWITC
H4:PHY_RECFG_
REEST_SWITCH
caused by physical channel reconfiguration.
Information."
Default
value/recomme
nded value
CORRM
Algorithm
Reserved
Switch 1
ReservedSwitch1
:RESERVED_SWI
TCH_1_BIT20
caused by RB reconfiguration (DCCC)
Information."
Default
value/recomme
nded value
CORRM
Algorithm
Reserved
Switch 1
ReservedSwitch1
:RESERVED_SWI
TCH_1_BIT19
caused by physical channel reconfiguration.
Information."
Default
value/recomme
nded value
CORRM
Algorithm
Reserved
Switch 1
ReservedSwitch1
:RESERVED_SWI
TCH_1_BIT26
caused by PS TRB reset.
Information."
Default
value/recomme
nded value

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Parameter
Name
Reserved
parameter 1
RsvdPara1:RSVD
BIT1_BIT24
Switch that controls call reestablishment for
CS services.
Information."
Radio network
plan (internal)
Reserved
parameter 1
RsvdPara1:RSVD
BIT1_BIT25
Switch that controls call reestablishment for
PS services.
Information."
Radio network
plan (internal)
Process
Control
Switch 4
PROCESSSWITC
H4:IUR_RL_REE
ST_SWITCH
under different RNCs.
Information."
Default
value/recomme
nded value
Reserved
parameter 1
RsvdPara1:RSVD
BIT1_BIT28
triggered when T313 expires after an RL
failure.
Information."
Radio network
plan (internal)
Wait RB setup
response
timer
RbSetupRspTmr Set this parameter to 10s if
PROCESSSWITCH4:RB_SETUP_RL_REE
ST_SWITCH is enabled.
Radio network
plan (internal)
Wait RB
reconfiguratio
n response
timer
RbRecfgRspTmr Set this parameter to 10s if
ReservedSwitch1:RESERVED_SWITCH_1
_BIT14 is enabled.
Radio network
plan (internal)
HO active set
update
response
timer
HoAsuTmr Set this parameter to 10s. Radio network
plan (internal)
HO PhyCh
reconfiguratio
n timer
HoPhychRecfgT
mr
Set this parameter to 10s if
PROCESSSWITCH4:PHY_RECFG_REEST
_SWITCH is enabled.
Radio network
plan (internal)
10.4.3 Function Activation
Step 1 Set the following parameters appropriately:
1. Run the SET UCONNMODETIMER command to set Timer 302, Constant 302, Timer 313,
Constant 313, Timer 314, Constant 315, and Timer 315.
2. Run the MOD UCELL command to set Num of Continuous in Sync Ind, Num of Continuous Out
of Sync Ind, and Radio Link Failure Timer Length.

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35
3. Run the SET UCACALGOSWITCH command to set Reserved parameter 2 and Reserved
parameter 3.
4. Run the SET URRCTRLSWITCH command to set Reserved parameter 1 to RSVDBIT1_BIT28.
Step 2 Enable the switches that control the call reestablishment feature for CS and PS services.
1. Run the SET URRCTRLSWITCH command and select RSVDBIT1_BIT24 and RSVDBIT1_BIT25
under Reserved parameter 1.
Step 3 Enable the switches that control the call reestablishment feature triggered by RL failures and
SRB resets.
1. Run the SET URRCTRLSWITCH command and select RSVDBIT1_BIT22 and RSVDBIT1_BIT23
Step 4 Set the timer for the Active Set Update process.
1. Run the SET USTATETIMER command to set HO active set update response timer.
Step 5 Enable the switch that controls the call reestablishment feature triggered by physical channel
reconfiguration.
1. Run the SET URRCTRLSWITCH command and select PHY_RECFG_REEST_SWITCH under
Process Control Switch 4.
2. Run the SET USTATETIMER command to set HO PhyCh reconfiguration timer.
Step 6 Enable the switch that controls the call reestablishment feature triggered by RB setup.
1. Run the SET URRCTRLSWITCH command and select RB_SETUP_RL_REEST_SWITCH under
2. Run the SET USTATETIMER command to set Wait RB setup response timer.
Step 7 Enable the switch that controls the call reestablishment feature triggered by RB reconfiguration.
1. Run the SET UCORRMPARA command and select RESERVED_SWITCH_1_BIT14 under CORRM
Algorithm Reserved Switch 1.
2. Run the SET USTATETIMER command to set Wait RB reconfiguration response timer.
Step 8 Enable the switch that controls the call reestablishment feature under different RNCs.
Run the SET URRCTRLSWITCH command and select IUR_RL_REEST_SWITCH under Process
Control Switch 4.
Step 9 Enable the switch that controls the call reestablishment feature triggered by RB reconfiguration
Run the SET UCORRMPARA command and select RESERVED_SWITCH_1_BIT20 under CORRM
Step 10 Enable the switch that controls the call reestablishment feature triggered by physical channel
reconfiguration
Step 11 Enable the switch that controls the call reestablishment feature triggered by PS TRB rreset

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36
----End
10.4.4 MML Command Example
SET UCONNMODETIMER: T302=D1400, N302=3, T313=3, N313=D20, T314=D12, T315=D10, N315=D20;
MOD UCELL: CellId=01, NInsyncInd=8, NOutsyncInd=8;
SET UCACALGOSWITCH: RsvdPara2=15000, RsvdPara3=30000;
SET URRCTRLSWITCH: PROCESSSWITCH4=PHY_RECFG_REEST_SWITCH-1&
IUR_RL_REEST_SWITCH-1&RB_SETUP_RL_REEST_SWITCH-1,
RsvdPara1=RSVDBIT1_BIT22-0&RSVDBIT1_BIT23-0&RSVDBIT1_BIT24-0&RSVDBIT1_BIT25-0&RSVDBIT1_BIT28-0;
SET UCORRMPARA: ReservedSwitch1=RESERVED_SWITCH_1_BIT14-1;
SET USTATETIMER: HoAsuTmr=10000,RbSetupRspTmr=10000, RbRecfgRspTmr =10000,HoPhychRecfgTmr=10000;
10.4.5 Activation Observation
In call reestablishment triggered under the same RNC, track the IOS signaling according to Figure 3-1. If
the NBAP_RL_ACT_CMD message can be tracked, the call reestablishment feature is enabled on the
live network.
In call reestablishment triggered under different RNCs, track the IOS signaling according to Figure 3-2. If
the RNSAP_RL_DEL_REQ message can be tracked, the call reestablishment feature is enabled on the
live network.
10.4.6 Deactivation
Step 1 Disable the switches that control the call reestablishment feature for CS and PS services.
Run the SET URRCTRLSWITCH command and clear RSVDBIT1_BIT24 and RSVDBIT1_BIT25
Step 2 Disable the switches that control the call reestablishment feature triggered by RL failures and
SRB resets.
Run the SET URRCTRLSWITCH command and clear RSVDBIT1_BIT22 and RSVDBIT1_BIT23
Step 3 Disable the switch that controls the call reestablishment feature triggered by physical channel
reconfiguration.
Run the SET URRCTRLSWITCH command and clear PHY_RECFG_REEST_SWITCH under
Step 4 Disable the switch that controls the call reestablishment feature triggered by RB setup.
Run the SET URRCTRLSWITCH command and clear RB_SETUP_RL_REEST_SWITCH under
Step 5 Disable the switch that controls the call reestablishment feature triggered by RB reconfiguration.
Run the SET UCORRMPARA command and clear RESERVED_SWITCH_1_BIT14 under CORRM
Step 6 Disable the switch that controls the call reestablishment feature triggered by RB reconfiguration

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37
Step 7 Disable the switch that controls the call reestablishment feature triggered by physical channel
reconfiguration
Step 8 Disable the switch that controls the call reestablishment feature triggered by PS TRB rreset
Step 9 Disable the switch that controls the call reestablishment feature under different RNCs.
Run the SET URRCTRLSWITCH command and clear IUR_RL_REEST_SWITCH under Process
Control Switch 4.
Step 10 Run the SET URRCTRLSWITCH command and clear RSVDBIT1_BIT28 under Reserved
parameter 1.
Step 11 (Optional) Set the following parameters to the values they were before the function was enabled:
1. Run the SET UCONNMODETIMER command to reset the following parameters to their original
values: Timer 302, Constant 302, Timer 313, Constant 313, Timer 314, Constant 315, and Timer
315.
2. Run the MOD UCELL command to reset the following parameters to their original values: Num of
Continuous in Sync Ind, Num of Continuous Out of Sync Ind, and Radio Link Failure Timer
Length.
3. Run the SET UCACALGOSWITCH command to reset Reserved parameter 2 and Reserved
parameter 3 to their original values.
4. Run the SET USTATETIMER to reset the following parameters to their original values: HO active set
update response timer, HO PhyCh reconfiguration timer, Wait RB setup response timer, and
Wait RB reconfiguration response timer.
----End
10.4.7 MML Command Example
// Deactivating call reestablishment
SET URRCTRLSWITCH: PROCESSSWITCH4=PHY_RECFG_REEST_SWITCH-0&
RB_REL_RL_REEST_SWITCH-0&IUR_RL_REEST_SWITCH-0&RB_SETUP_RL_REEST_SWITCH-0,
RsvdPara1=RSVDBIT1_BIT22-1&RSVDBIT1_BIT23-1&RSVDBIT1_BIT24-1&RSVDBIT1_BIT25-1&RSVDBIT1_BIT28-1;
NOTE
When you deactivate the call reestablishment feature, change the values of the following parameters back to their settings
before this function was activated: T302, N302, T313, N313, N315, T314(CS), T315(PS), NinsyncInd, NoutsyncInd,
TRlFailure, RsvdPara2(CS), RsvdPara3(PS), RbSetupRspTmr, RbRecfgRspTmr, HoAsuTmr and
HoPhychRecfgTmr. Otherwise, network performance will be greatly affected.
10.5 Performance Monitoring
After the call reestablishment feature is enabled for CS services, observe the following KPIs:

WCDMA RAN
38
 Call drop rate: [VS.RAB.AbnormRel.AMR/(VS.RAB.AbnormRel.AMR + VS.RAB.NormRel.AMR)] x
100%
 RAB setup success rate: [(VS.RAB.SuccEstabCS.AMR/VS.RAB.AttEstab.AMR)] x 100%
After the call reestablishment feature is enabled, the preceding KPIs should be improved or the same as
those before the function was enabled. If the KPIs deteriorated, optimize them.
After the call reestablishment feature is enabled for PS services, observe the following KPIs:
 Call drop rate: [VS.RAB.AbnormRel.PS/(VS.RAB.AbnormRel.PS + VS.RAB.NormRel.PS)] x 100%
 RAB setup success rate: [(VS.RAB.SuccEstabPS.Conv+VS.RAB.SuccEstabPS.Str
+VS.RAB.SuccEstabPS.Int
+VS.RAB.SuccEstabPS.Bkg)/(VS.RAB.AttEstabPS.Conv+VS.RAB.AttEstabPS.Str+VS.RAB.AttEstab
PS.Int +VS.RAB.AttEstabPS.Bkg)]x100%
After the call reestablishment feature is enabled, the preceding KPIs should be improved or the same as
those before the function was enabled. If the KPIs deteriorated, optimize them.
10.6 Parameter Optimization
To strike a balance between KPIs and user experience, modify the following parameters based on
network conditions: T302, N302, T313, N313, N315, T314(CS), T315(PS), NinsyncInd, NoutsyncInd,
TRlFailure, RsvdPara2 (CS), and RsvdPara3 (PS). Because parameter modification greatly affects
network performance, contact Huawei technical support personnel before you modify the parameters.
10.7 Troubleshooting
None

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Call Reestablishment 11 Parameters
39
11 Parameters
Table 11-1 Parameter description
Paramet
er ID
NE MML
Command
Feature ID Feature Name Description
AMRlcDi
scardMo
de
BSC69
00
ADD
UTYPSRB
RLC
MOD
UTYPSRB
RLC
WRFD-020900 Logical Channel
Management
Meaning:This parameter
specifies whether the AM RLC
entity discards the Service Data
Units (SDUs) that need to be
sent and the discard mode. This
parameter is applicable only in
the RLC AM mode.
- If this parameter is set to
TIMER_BASED_WITH_EXPLI
CIT_SIGNALLING,
"ExplicitTimerDiscard" is
required for triggering SDU
discard. If the transmission time
exceeds a preset value, the TX
end discards this SDU. At the
same time, it sends a Move
Receiving Window (MRW)
command to the RX end,
indicating the discard, to update
the RX window. In this mode,
"ExplicitTimerMRW",
"ExplicitTimerDiscard", and
"ExplicitMaxMRW" need to be
set.
DISCARD_AFTER_MAX_DAT_
RETRANSMISSIONS,
"MaxDAT" is required for
triggering SDU discard. If the
number of transmissions of a
PDU exceeds a preset value,
the TX end discards the
corresponding SDU. At the
same time, it sends an MRW
command to the RX end,
indicating this discard, to
update the RX window. In this
mode, "MaxDAT", "TimerMRW",
and "MaxMRW" need to be set.
NO_DISCARD, the TX end
does not discard any SDU. If
the number of transmissions of
a PDU exceeds a preset value,
the AM RLC entity will be reset.
In this mode,

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40
Paramet
er ID
NE MML
Command
"NoDiscardMaxDAT" needs to
be set.
For details of this parameter,
refer to the 3GPP TS 25.322.
This parameter is an advanced
parameter. To modify this
parameter, contact Huawei
Customer Service Center for
technical support.
GUI Value
Range:TIMER_BASED_WITH_
EXPLICIT_SIGNALLING,
RETRANSMISSIONS,
NO_DISCARD
Actual Value
Range:TIMER_BASED_WITH_
EXPLICIT_SIGNALLING,
RETRANSMISSIONS,
NO_DISCARD
Unit:None
Default Value:None
HoAsuT
mr
BSC69
00
SET
USTATETI
MER
WRFD-020202
WRFD-020203
Intra RNC Soft
Handover
Inter RNC Soft
Handover
Meaning:A timer to RNC wait
for the response to active set
update in soft handover
procedure.
Note: The value range of
"HoAsuTmr" is 1 to 300000 in
the current version. In a later
version, the value range
changes into 100 to 300000. In
the current version, if you enter
a value within the range of 1 to
100 including 1, this value can
still be synchronized and issued
but the system regards the
value as 5000, the
recommended value.
Therefore, you are advised not
to enter a value smaller than
100.
GUI Value Range:1~300000
Actual Value Range:1~300000

WCDMA RAN
41
Paramet
er ID
NE MML
Command
Unit:ms
Default Value:5000
HoPhyc
hRecfgT
mr
BSC69
00
SET
USTATETI
MER
WRFD-020302
WRFD-020304
WRFD-020301
Inter Frequency Hard
Handover Based on
Coverage
Handover Based on DL
QoS
Intra Frequency Hard
Handover
Meaning:A timer to RNC wait
for the response to physical
channel reconfiguration in hard
handover procedure.
"HoPhychRecfgTmr" is 1 to
300000 in the current version.
In a later version, the value
range changes into 100 to
300000. In the current version,
if you enter a value within the
range of 1 to 100 including 1,
this value can still be
synchronized and issued but
the system regards the value as
5000, the recommended value.
100.
Unit:ms
Default Value:5000
N302 BSC69
00
SET
UCONNMO
DETIMER
WRFD-010101 3GPP R9 Specifications Meaning:Maximum number of
retransmissions of CELL
UPDATE/URA
UPDATE.Protocol default value
is 3.
GUI Value Range:0~7
Unit:None
Default Value:3
N313 BSC69
00
SET
UCONNMO
DETIMER
successive "out of sync"
indications received from L1.
Protocol default value is 20.
GUI Value Range:D1, D2, D4,
D10, D20, D50, D100, D200

WCDMA RAN
42
Paramet
er ID
NE MML
Command
Actual Value Range:1, 2, 4, 10,
20, 50, 100, 200
Unit:None
Default Value:D50
N315 BSC69
00
SET
UCONNMO
DETIMER
successive "in sync" indications
received from L1 when T313 is
activated. Protocol default value
is 1.
D10, D20, D50, D100, D200,
D400, D600, D800, D1000
20, 50, 100, 200, 400, 600, 800,
1000
Unit:None
Default Value:D1
NInsyncI
nd
BSC69
00
ADD
UCELLSET
UP
WRFD-022000 Physical Channel
Management
defines the times of successive
in-sync indications required for
the NodeB to trigger the radio
link recovery process.The radio
link set remains in the initial
state until it has received a
certain number (the number is
defined by NInsyncInd) of
successive in-sync indications
from L1, and then the NodeB
triggers the radio link recovery
process, which indicates that
the radio link set has been
synchronized. Once the radio
link recovery process is
triggered, the radio link set is
considered to be in the
synchronized state. In the radio
link maintenance process,
NInsyncInd is used together
with the successive out-of-sync
indication counter.
Unit:None

WCDMA RAN
43
Paramet
er ID
NE MML
Command
Default Value:5
NoDisca
rdMaxD
AT
BSC69
00
ADD
UTYPSRB
RLC
MOD
UTYPSRB
RLC
WRFD-020900 Logical Channel
Management
Meaning:This parameter is
applicable to only the AM RLC
entity whose
"AMRlcDiscardMode" is set to
NO_DISCARD. This parameter
specifies the maximum number
of transmissions of a PDU
before the RLC entity is reset.
When the mode is set to
NO_DISCARD, the RLC entity
will be directly reset if the
number of retransmissions of a
PDU reaches the value defined
by this parameter. The number
of retransmissions at the RLC
layer increases when the Uu
interface signal quality
deteriorates. In this situation,
set the parameter to a large
value. For details of this
parameter, refer to the 3GPP
TS 25.322.
technical support.
D4, D5, D6, D7, D8, D9, D10,
D15, D20, D25, D30, D35, D40
5, 6, 7, 8, 9, 10, 15, 20, 25, 30,
35, 40
Unit:None
Default Value:None
NOutsyn
cInd
BSC69
00
ADD
UCELLSET
UP
WRFD-022000 Physical Channel
Management
defines the times of successive
in-sync indications required for
starting the radio link failure
timer. When the radio link set is
in the synchronized state, the
NodeB starts the timer after it
receives successive out-of-sync
indications of the number
defined by NOutsyncInd.The

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44
Paramet
er ID
NE MML
Command
NodeB shall stop and reset the
timer after receiving successive
in-sync indications of the
number defined by
NInsyncInd.When the timer
expires, the NodeB triggers the
radio link failure process, and
indicates which radio link set is
out-of-sync.
Unit:None
Default Value:50
PROCE
SSSWIT
CH4
BSC69
00
SET
URRCTRL
SWITCH
WRFD-020302
WRFD-010510
WRFD-140205
WRFD-020304
Handover Based on
Coverage
3.4/6.8/13.6/27.2Kbps
RRC Connection and
Radio Access Bearer
Establishment and
Release
Voice Service
Experience
Improvement for Weak
Reception Ues
Handover Based on DL
QoS
Meaning:1)
AMR_HHO_FAIL_ROLLBACK_
SWITCH (Hard Handover
Failure Rollback Switch for CS
AMR Speech Services)
When this switch is turned on,
the BSC6900 supports rollback
caused by failed hard
handovers of CS AMR speech
services. It is recommended
that the timer T312 be set to 1
second (SET
UCONNMODETIMER:
T312=1;) before turning on this
switch. If the timer T312 is not
set to 1 second, AMR noise will
occur on some UEs.
When this switch is turned off,
the BSC6900 does not support
rollback caused by failed hard
handovers of CS AMR speech
services, leading to call drops.
2)
RRC_CONN_SETUP_OPT_S
WITCH (RRC CONNECTION
SETUP Message Optimization
Switch)
Whether optimization of the
RRC CONNECTION SETUP
message takes effect.
optimization of the RRC

WCDMA RAN
45
Paramet
er ID
NE MML
Command
CONNECTION SETUP
message takes effect. If the IE
RLC info under SRB3 or SRB4
in the RRC CONNECTION
SETUP message contains the
same information as that under
SRB2, the BSC6900 replaces
the IE RLC info under SRB3 or
SRB4 with the IE same as
RB:0x2(2) to shorten the length
of the message.
the BSC6900 does not replace
the IE RLC info under SRB3 or
SRB4 in the RRC
CONNECTION SETUP
message.
3)
PS_F2D_OVERLAP_CELLUPT
_SWITCH (Switch for
Simultaneous PS Service Setup
F2D and Cell Update
Procedures)
During the PS service setup,
the BSC6900 undoes a
CELL_FACH-to-CELL_DCH
(F2D for short) procedure when
it receives a Cell Update
message with the cause value
"cell reselection" during the F2D
procedure.
the BSC6900 temporarily does
not send the
RANAP_RAB_ASSIGNMENT_
RESP message to the CN after
the F2D procedure is undone
and waits until the Cell Update
message is processed and the
PS service is set up
successfully.
the BSC6900 directly responds
to the CN with a
RANAP_RAB_ASSIGNMENT_
RESP message with the cause
value "IU_UNSPEC_FAIL" after
the F2D procedure is undone,
indicating that the PS service

WCDMA RAN
46
Paramet
er ID
NE MML
Command
fails to be set up.
4)
TCP_ACK_ACCELERATOR_S
WITCH (Switch for Throughput
Increase in the Case of
Simultaneous uplink and
downlink Transmissions)
This switch is turned on to
increase the total throughput in
the uplink and downlink only
when uplink and downlink
HSPA data is transmitted
simultaneously. In other
scenarios, you are advised to
turn off the switch.
the function of increasing the
total throughput in the case of
simultaneous uplink and
downlink transmissions takes
effect.
the function of increasing the
total throughput in the case of
simultaneous uplink and
downlink transmissions does
not take effect.
5)
PHY_RECFG_REEST_SWITC
H (Switch for RL
Reestablishments During the
Physical Channel
Reconfiguration)
When this switch is turned on, a
UE sends the BSC6900 a Cell
Update message with the cause
value "Radio Link Failure" and
the BSC6900 reestablishes the
radio link for the UE under the
following conditions:
The UE has not responded to
the Physical Channel
Reconfiguration message.
The BSC6900 detects
interrupted downlink
transmission on SRB2 or the
NodeB reports that all radio

WCDMA RAN
47
Paramet
er ID
NE MML
Command
links of the UE are out of
synchronization.
the BSC6900 does not
reestablish the radio link for the
UE under the preceding
conditions.
6) IUR_RL_REEST_SWITCH
(Iur RL Reestablishment
Switch)
When this switch is turned on, a
UE sends the BSC6900 a Cell
Update message with the cause
value "Radio Link Failure" and
the BSC6900 reestablishes the
radio link for the UE under the
following conditions:
The UE has a radio link for the
DRNC.
The BSC6900 does not perform
any procedures or it performs
an active set update or physical
procedure.
The BSC6900 detects that the
SRB2 is disconnected in the
downlink or the NodeB reports
that all radio links of the UE are
out of synchronization.
the BSC6900 does not
reestablish the radio link for the
UE under the preceding
conditions.
7)
RB_SETUP_RL_REEST_SWIT
CH (Switch for RL
Reestablishment or Cell Update
During an RB Setup)
When this switch is turned on
and the BSC6900 is waiting for
a UE's response during a radio
bearer (RB) setup
CELL_DCH-to-CELL_DCH
(D2D) procedure:
The BSC6900 reestablishes a

WCDMA RAN
48
Paramet
er ID
NE MML
Command
radio link (RL) for the UE if the
BSC6900 detects a signaling
radio bearer (SRB) reset at
layer 2 (L2) or all uplink RLs for
the UE are out of
synchronization upon expiration
of the RL Restore timer. For the
RL reestablishment triggered by
SRB reset detected by
BSC6900, the switch
CELLUPT_RLFAILURE_SRBR
EESTAB_SWITCH under
"PROCESSSWITCH2" in the
"SET URRCTRLSWITCH"
command should be turned on.
The BSC6900 performs a cell
update if the BSC6900 receives
a CELL UPDATE message with
the cause value of RL
FAILURE, RLC
UNRECOVERABLE ERROR,
or REENTERED SERVICE
AREA.
When this switch is turned off
and the BSC6900 is waiting for
a UE's response during an RB
setup D2D procedure, the
BSC6900 does not perform an
RL reestablishment or cell
update even if the trigger
conditions are met.
8)
RRC_CELLFACH_TRB_RESE
T_TO_F2D_SWITCH (The
CELL_FACH-to-CELL_DCH
state (F2D) transition switch by
TRB reset)
When the BSC6900 receives a
TRB reset request from a UE in
the CELL_FACH state, the
BSC6900 cannot respond to the
UE with a confirm message if
the FACH is congested. The
T_TO_F2D_SWITCH
parameter specifies whether a
UE performs an F2D transition
if the number of TRB reset
requests from the UE to the
BSC6900 reaches a specified

WCDMA RAN
49
Paramet
er ID
NE MML
Command
threshold.
If the switch is turned on, the
UE moves from the
CELL_FACH state to the
CELL_DCH state.
If the switch is turned on, the
UE does not move from the
CELL_DCH state.
This function helps to reduce
the number of call drops caused
by the BSC6900 not responding
to the TRB reset requests
during FACH congestion.
9)
SEND_MSG_NULL_SWITCH
(MM NULL Message Switch)
Whether the BSC6900 sends
an MM NULL message to the
CS CN. If the switch
RNC_CS_QUERY_UE_IMEI_S
WITCH under
PROCESSSWITCH2 in the
SET URRCTRLSWITCH
command is turned on, testing
the interworking between the
BSC6900 and the CN is
required. If the CN needs to
verify the serial number of direct
transfer messages, turn on this
switch.
The BSC6900 rather than the
CS CN sends an IDENTITY
REQUEST message to a UE to
obtain its IMEI. Upon receiving
an IDENTITY RESPONSE
message from the UE:
The BSC6900 sends an MM
NULL message to the CS CN if
this switch is turned on.
The BSC6900 does not send an
MM NULL message to the CS
CN if this switch is turned off.
10)
CS_HHO_ASYNC_CTRL_SWI
TCH(Asynchronous

WCDMA RAN
50
Paramet
er ID
NE MML
Command
Reconfigure Switch for CS
HHO)
the BSC6900 does not put the
activation time information
element (IE) in the hard
handover configuration
message for CS services. After
receiving the message, the UE
immediately activates the
configuration.
the BSC6900 puts the
activation time IE in the hard
message for CS services. After
activates the configuration at
the specified activation time.
11)
PS_HHO_ASYNC_CTRL_SWI
TCH(Asynchronous
Reconfigure Switch for PS
HHO)
message for PS services. After
immediately activates the
configuration.
message for PS services. After
activates the configuration at
the specified activation time.
12)
IUR_HHO_ASYNC_CTRL_SWI
TCH(Asynchronous
Reconfigure Switch for Iur
HHO)

WCDMA RAN
51
Paramet
er ID
NE MML
Command
message across the Iur
interface. After receiving the
message, the UE immediately
activates the configuration.
message across the Iur
interface. After receiving the
message, the UE activates the
configuration at the specified
activation time.
13)
R8_UE_SEL_DPUE_SWITCH
(Switch for Preferentially
Allocating DPUe Resources to
UEs That Comply with 3GPP
Release 8 or Later)
the BSC6900 preferentially
allocates DPUe resources in
any subrack to UEs that comply
with 3GPP Release 8 or later.
the BSC6900 preferentially
allocates DPU resources in the
subrack that the UEs access to
UEs that comply with 3GPP
Release 8 or later. The
BSC6900 allocates DPU
resources in other subracks
only when the amount of
consumed DPU resources in
this subrack exceeds a preset
threshold for inter-subrack
resource sharing.
14)
F2P_DATATRANS_OPTIMIZE_
SWITCH(Switch for Optimized
Data Transmission before a
State Transition from
CELL_FACH to CELL_PCH or
URA_PCH)
Whether the BSC6900 queries

WCDMA RAN
52
Paramet
er ID
NE MML
Command
the RLC state before and after a
UE moves from the
CELL_PCH or URA_PCH state
due to event 4B.
A UE in the CELL_FACH state
can move to the CELL_PCH or
URA_PCH state even when
there is downlink data
transmission for the UE. When
this occurs, data packets are
suspended on the BSC6900
side. This switch is introduced
to solve this problem.
the BSC6900 queries the RLC
state before a UE moves from
the CELL_FACH state to the
CELL_PCH or URA_PCH state
due to event 4B. If the state
query fails, the UE does not
perform the state transition. If
the state query succeeds, the
UE continues with the state
transition. The BSC6900
queries the RLC state again
after the state transition is
complete and before the L2 link
is deactivated. If there is SRB3,
SRB4, or TRB data to be
transmitted to the UE on the
RLC, the paging procedure is
triggered.
the original state transition from
CELL_FACH to CELL_PCH or
URA_PCH is used.
technical support.
GUI Value
Range:PS_F2D_OVERLAP_C
ELLUPT_SWITCH,
SWITCH,
H, IUR_RL_REEST_SWITCH,

WCDMA RAN
53
Paramet
er ID
NE MML
Command
CH,
WITCH,
WITCH,
T_TO_F2D_SWITCH,
SEND_MSG_NULL_SWITCH,
TCH,
TCH,
TCH,
R8_UE_SEL_DPUE_SWITCH,
SWITCH
Actual Value
Range:PS_F2D_OVERLAP_C
ELLUPT_SWITCH,
SWITCH,
H, IUR_RL_REEST_SWITCH,
CH,
WITCH,
WITCH,
T_TO_F2D_SWITCH,
SEND_MSG_NULL_SWITCH,
TCH,
TCH,
TCH,
R8_UE_SEL_DPUE_SWITCH,
SWITCH
Unit:None
Default
Value:PS_F2D_OVERLAP_CE
LLUPT_SWITCH-0&AMR_HH
O_FAIL_ROLLBACK_SWITCH-
0&PHY_RECFG_REEST_SWI
TCH-0&IUR_RL_REEST_SWIT

WCDMA RAN
54
Paramet
er ID
NE MML
Command
CH-0&RB_SETUP_RL_REEST
_SWITCH-0&RRC_CONN_SE
TUP_OPT_SWITCH-0&TCP_A
CK_ACCELERATOR_SWITCH
-0&RRC_CELLFACH_TRB_RE
SET_TO_F2D_SWITCH-0&SE
ND_MSG_NULL_SWITCH-0&
TCH-0&PS_HHO_ASYNC_CT
RL_SWITCH-0&IUR_HHO_AS
YNC_CTRL_SWITCH-0&R8_U
E_SEL_DPUE_SWITCH-0&F2
P_DATATRANS_OPTIMIZE_S
WITCH-0
RbRecfg
RspTmr
BSC69
00
SET
USTATETI
MER
WRFD-010101 3GPP R9 Specifications Meaning:A timer used to wait
for the RB reconfiguration
response from UE in the RB
procedure. Refer to the Note.
Actual Value
Range:300~300000
Unit:ms
Default Value:5000
RbSetup
RspTmr
BSC69
00
SET
USTATETI
MER
WRFD-010101 3GPP R9 Specifications Meaning:A timer to RNC wait
for the RB setup response from
UE in the RB procedure. Refer
to the Note.
Actual Value
Range:300~300000
Unit:ms
Default Value:5000
Reserve
dSwitch
1
BSC69
00
SET
UCORRMP
ARA
None None Meaning:CORRM algorithm
reserved switch 1. The switch is
reserved for further change
request use.
Disuse statement: This
parameter is used temporarily
in patch versions and will be
replaced with a new parameter
in later versions. The new
parameter ID reflects the

WCDMA RAN
55
Paramet
er ID
NE MML
Command
parameter function. Therefore,
this parameter is not
recommended for the
configuration interface.
GUI Value
Range:RESERVED_SWITCH_
1_BIT1,
RESERVED_SWITCH_1_BIT2,
0,
1,
2,
3,
4,
5,
6,
7,
8,
9,
0,
1,
2,
3,
4,
5,
6,
7,

WCDMA RAN
56
Paramet
er ID
NE MML
Command
8,
9,
0,
1,
2
Actual Value
Range:RESERVED_SWITCH_
1_BIT1,
0,
1,
2,
3,
4,
5,
6,
7,
8,
9,
0,
1,
2,
3,
4,
5,

WCDMA RAN
57
Paramet
er ID
NE MML
Command
6,
7,
8,
9,
0,
1,
2
Unit:None
Default
Value:RESERVED_SWITCH_1
_BIT1-0&RESERVED_SWITC
H_1_BIT2-0&RESERVED_SWI
TCH_1_BIT3-0&RESERVED_S
WITCH_1_BIT4-0&RESERVED
_SWITCH_1_BIT5-0&RESERV
ED_SWITCH_1_BIT6-1&RESE
RVED_SWITCH_1_BIT7-0&RE
SERVED_SWITCH_1_BIT8-0&
RESERVED_SWITCH_1_BIT9-
0&RESERVED_SWITCH_1_BI
T10-0&RESERVED_SWITCH_
1_BIT11-0&RESERVED_SWIT
CH_1_BIT12-0&RESERVED_S
WITCH_1_BIT13-0&RESERVE
D_SWITCH_1_BIT14-0&RESE
RVED_SWITCH_1_BIT15-0&R
ESERVED_SWITCH_1_BIT16-

WCDMA RAN
58
Paramet
er ID
NE MML
Command
1_BIT32-0
RlRstrT
mr
BSC69
00
SET
USTATETI
MER
WRFD-010101 3GPP R9 Specifications Meaning:A timer to RNC wait
for radio link restoration
indication in the radio link
procedure.
"RlRstrTmr" is 1 to 300000 in
the current version. In a later
version, the value range
changes into 100 to 300000. In
the current version, if you enter
a value within the range of 1 to
100 including 1, this value can
still be synchronized and issued
but the system regards the
value as 11000, the
recommended value.
100.
Unit:ms
Default Value:11000
RsvdPar
a1
BSC69
00
SET
URRCTRL
SWITCH
WRFD-010101 3GPP R9 Specifications Meaning:2)
NAS_QOS_MOD_SWITCH
(QoS Change Switch for NAS)
When the switch is turned on,
for UEs whose HS-DSCH
category is smaller than 13, if
the maximum downlink rate
specified in the PDP activation
requests from the UEs exceeds
16 Mbit/s, the requests are sent
to the CN after the rate is
changed to 16 Mbit/s.
When the switch is turned off,
the PDP activation requests are
sent to the CN without changing
the maximum downlink rate.
15) RSVDBIT1_BIT15
(Reserved Parameter 1 Bit 15)

WCDMA RAN
59
Paramet
er ID
NE MML
Command
the RNC enables the function of
AMR mute detection.
the RNC disables the function
of AMR mute detection.
16) RSVDBIT1_BIT16
the RNC can perform DRDs
during the P2D procedure.
the RNC cannot perform DRDs
during the P2D procedure.
17)
SYSHO_CSIN_PERMIT_SWIT
CH (2G-to-3G CS Handover
Switch)
inter-RAT CS handovers from
2G cells to 3G cells are allowed.
inter-RAT CS handovers from
2G cells to 3G cells are not
allowed.
20) RSVDBIT1_BIT20
the RNC performs a state
transition from CELL_PCH or
URA_PCH to CELL_FACH
(P2F) upon receiving a CELL
UPDATE message with the
cause value "uplink data
transmission" or "paging
response".
When this switch is turned off, if
receiving a CELL UPDATE
message with the cause value
"uplink data transmission" or
"paging response," the RNC
performs a state transition from
CELL_PCH or URA_PCH to
CELL_DCH (P2D) in either of
the following scenarios:
(1)Congestion occurs on the

WCDMA RAN
60
Paramet
er ID
NE MML
Command
FACH.
(2)Congestion occurs on the
DCCH, and the value of the
Establishment cause
information element (IE) in the
message is Originating
Conversational Call,
Terminating Conversational
Call, or Emergency Call.
21) RSVDBIT1_BIT21
for UEs that are establishing
AMR services and shifting from
CELL_DCH state, the RNC
stops establishing AMR
services to handle cell update if
the RNC receives from the UEs
a cell update message
containing the cause value "cell
reselection."
for UEs that are establishing
AMR services and shifting from
CELL_DCH state, if the RNC
receives from the UEs a cell
update message containing the
cause value "cell reselection,"
the RNC stops establishing
AMR services to handle cell
update and resumes AMR
services only after cell update is
completed.
22) RSVDBIT1_BIT22
the RNC does not trigger cell
update with the cause value
"RL Failure" if the RNC detects
transmission on SRB2.
the RNC triggers cell update
with the cause value "RL
Failure" and reestablishes radio
links if the RNC detects

WCDMA RAN
61
Paramet
er ID
NE MML
Command
transmission on SRB2.
23) RSVDBIT1_BIT23
the RNC does not trigger cell
"RL Failure" reported by a UE if
the associated NodeB reports
to the RNC that all radio links
for the UE experience
synchronization loss.
Failure" reported by a UE and
reestablishes radio links, if the
associated NodeB reports to
the RNC that all radio links for
the UE experience
24) RSVDBIT1_BIT24
for UEs using CS services, the
RNC does not trigger cell
"RL Failure" reported by a UE, if
the RNC detects interrupted
downlink transmission on
SRB2, or if the associated
NodeB reports to the RNC that
all radio links for the UE
experience synchronization
loss.
for UEs using CS services, the
RNC triggers cell update with
the cause value "RL Failure"
reported by a UE and
reestablishes radio links, if the
RNC detects interrupted
loss.

WCDMA RAN
62
Paramet
er ID
NE MML
Command
25) RSVDBIT1_BIT25
for UEs using PS services only,
the RNC does not reestablish
radio links for a UE if the RNC
detects interrupted downlink
transmission on SRB2, or if the
associated NodeB reports to
the RNC that all radio links for
the UE experience
for UEs using PS services only,
Failure" reported by a UE and
reestablishes radio link, if the
RNC detects interrupted
loss.
26) RSVDBIT1_BIT26
the RNC does not reestablish
radio links for a UE if the UE
reports to the RNC cell update
caused by SRB reset.
the RNC reestablishes radio
links for a UE if the UE reports
to the RNC cell update caused
by SRB reset.
28) RSVDBIT1_BIT28
for UEs using CS services, if a
all radio links for a UE
loss, the RNC starts the RL
Restore timer whose duration is
specified by the RlRstrTmr
parameter in the SET

WCDMA RAN
63
Paramet
er ID
NE MML
Command
USTATETIMER command.
After the timer has expired, the
RNC triggers cell update with
the cause value "radio link
failure" and reestablishes radio
links for the UE.
for UEs using CS services, if a
all radio links for a UE
loss, the RNC starts the RL
Restore timer whose duration is
specified by the T313
parameter in the SET
UCONNMODETIMER
command. After the timer has
expired, the RNC triggers cell
"radio link failure" and
reestablishes radio links for the
UE.
29) RSVDBIT1_BIT29
the RNC performs the
CELL_DCH-to-CELL_FACH
(D2F for short) procedure on
UEs that support fast dormancy.
the RNC performs the
CELL_DCH-to-CELL_PCH
(D2P for short) procedure on
UEs that support fast dormancy.
recommended for the
GUI Value
Range:RSVDBIT1_BIT1,
NAS_QOS_MOD_SWITCH,
RSVDBIT1_BIT3,

WCDMA RAN
64
Paramet
er ID
NE MML
Command
RSVDBIT1_BIT4,
RSVDBIT1_BIT5,
RSVDBIT1_BIT6,
RSVDBIT1_BIT7,
RSVDBIT1_BIT8,
RSVDBIT1_BIT9,
RSVDBIT1_BIT10,
RSVDBIT1_BIT11,
RSVDBIT1_BIT12,
RSVDBIT1_BIT13,
RSVDBIT1_BIT14,
RSVDBIT1_BIT15,
RSVDBIT1_BIT16,
SYSHO_CSIN_PERMIT_SWIT
CH, RSVDBIT1_BIT18,
RSVDBIT1_BIT19,
RSVDBIT1_BIT20,
RSVDBIT1_BIT21,
RSVDBIT1_BIT22,
RSVDBIT1_BIT23,
RSVDBIT1_BIT24,
RSVDBIT1_BIT25,
RSVDBIT1_BIT26,
RSVDBIT1_BIT27,
RSVDBIT1_BIT28,
RSVDBIT1_BIT29,
RSVDBIT1_BIT30,
RSVDBIT1_BIT31,
RSVDBIT1_BIT32
Actual Value Range:This
parameter is set to 0 or 1
according to the related
domains.
Unit:None
Default
Value:RSVDBIT1_BIT1-0&NAS
_QOS_MOD_SWITCH-0&RSV
DBIT1_BIT3-0&RSVDBIT1_BIT
4-0&RSVDBIT1_BIT5-0&RSVD
BIT1_BIT6-0&RSVDBIT1_BIT7
-0&RSVDBIT1_BIT8-0&RSVDB
IT1_BIT9-0&RSVDBIT1_BIT10-
0&RSVDBIT1_BIT11-0&RSVD
BIT1_BIT12-0&RSVDBIT1_BIT
13-0&RSVDBIT1_BIT14-0&RS
VDBIT1_BIT15-0&RSVDBIT1_
BIT16-0&SYSHO_CSIN_PERM
IT_SWITCH-1&RSVDBIT1_BIT

WCDMA RAN
65
Paramet
er ID
NE MML
Command
BIT21-1&RSVDBIT1_BIT22-1&
RSVDBIT1_BIT23-1&RSVDBIT
1_BIT24-1&RSVDBIT1_BIT25-
1&RSVDBIT1_BIT26-1&RSVD
BIT1_BIT27-1&RSVDBIT1_BIT
BIT31-0&RSVDBIT1_BIT32-1
RsvdPar
a2
BSC69
00
SET
URRCTRL
SWITCH
WRFD-010101 3GPP R9 Specifications Meaning:Reserved parameter
2.
recommended for the
GUI Value
Range:RSVDBIT1_BIT1,
RSVDBIT1_BIT2,
RSVDBIT1_BIT3,
RSVDBIT1_BIT4,
RSVDBIT1_BIT5,
RSVDBIT1_BIT6,
RSVDBIT1_BIT7,
RSVDBIT1_BIT8,
RSVDBIT1_BIT9,
RSVDBIT1_BIT10,
RSVDBIT1_BIT11,
RSVDBIT1_BIT12,
RSVDBIT1_BIT13,
RSVDBIT1_BIT14,
RSVDBIT1_BIT15,
RSVDBIT1_BIT16,
RSVDBIT1_BIT17,
RSVDBIT1_BIT18,
RSVDBIT1_BIT19,
RSVDBIT1_BIT20,
RSVDBIT1_BIT21,
RSVDBIT1_BIT22,
RSVDBIT1_BIT23,
RSVDBIT1_BIT24,
RSVDBIT1_BIT25,
RSVDBIT1_BIT26,
RSVDBIT1_BIT27,
RSVDBIT1_BIT28,
RSVDBIT1_BIT29,

Huawei Call Reestablishment RAN14

Huawei Call Reestablishment RAN14

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