1. 6 Paging
© Alcatel University - 8AS 90200 0726 VT ZZA Ed.01
A900/1800 NSS - PLMN setting in RCP and HLR
6.1
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.1

2. 6 Paging
Session presentation
6.2
Objective: to manage PLMN common data related
to paging
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.2

3. 6 Paging
Session presentation
6.3
Program:
6 Paging
6.1 Introduction
6.2 Scenario
6.3 Messages
6.4 Programmable data
6.5 Unsolicited messages
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.3

4. 6 Paging
6.1 Introduction
© Alcatel University - 8AS 90200 0726 VT ZZA Ed.01
6.4
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5. 6.1 Introduction
6.5
A Page message is sent by the VLR to the RCF to initiate the PAGING
procedure in the event of a TC call. This procedure follows the
authentication and ciphering phases.
A number of paging attempts are possible on all the cells or, in cases of
congestion, over a list of cells. These cases are conditioned by system
parameters.
The Search for mobile subscriber message is sent by the VLR to the
RCP when the identity of the LAC is unknown to the VLR. This message
initiates a paging procedure if option F-PA-003 is active.
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.5

6. 6 Paging
6.2 Scenarios
© Alcatel University - 8AS 90200 0726 VT ZZA Ed.01
6.6
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.6

7. 6.2 Scenarios
Successful or absentee subscriber
6.7
MS BSS RCF VLR
Paging
Paging - res
Paging request
Paging
Page - inv
Page - res
Paging
successful
Paging
Paging request
Page - inv
TPAG (to wait a response)
nb of repetitions =
NB_PAG_ATTEMPT
Paging absent
Subscriber absent
Subscriber
Paging request
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.7

8. 6.2 Scenarios
During restoration of the VLR
6.8
MS BSS RCF VLR
Paging
Paging - res
Paging request
Paging
Search MS
Search - res
Restoration of
the VLR
procedure initiated
if F-PA-003 is set to False
(the VLR has not saved the
mobile's location area)
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.8

9. 6.2 Scenarios
Early ACM
6.9
MS BSS RCF PSTN
ISUP (IAM)
SSP
INAP (Provide Instruction)
If early ACM is activated
(F_SW_003 = True), timer
RG_TACMAN is initiated
1st Paging
Paging
TPAG (to wait a response)
TPAG RG_TACMAN T1
Start T11 : wait ACM
T11 expired : call unsuccessful
ISUP (early ACM)
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.9

10. 6 Paging
6.3 Messages
© Alcatel University - 8AS 90200 0726 VT ZZA Ed.01
6.10
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.10

11. 6.3 Messages
Paging messages
Message Parameters Phase
2
M
M
O
M
O
O
M
M
M
M
M
M
M
M
O
M: Mandatory
O: Optional
6.11
PAGING-inv
RCF BSC
- Message type (paging)
- IMSI
- TMSI
- Cell Identifier list (1)
- Channel needed (2)
- Alerting required (3)
Complete layer
3 information
PAGING-res
BSC RCF
- Message type
- Cell Identifier (4)
- Layer 3 information
. Protocol discriminator
. Transaction identifier
. Skip indicator
. Message type (paging response)
. Ciphering key sequence number
. MS classmark 2 (5)
. Mobile identity
- Chosen Channel (6)
(1) Cell Identification discriminator field indicates
whether the CGI parameter is used partially or in full to
identify the cells in the list. In all paging cases (normal,
search or repetition of paging), if the list of cells exceeds
the normal length of a paging message, the All Cells
format is used.
CGI (discriminator= 00000000)
LAC+CI (discriminator= 00000001).
LAI (discriminator= 00000100).
LAC (discriminator= 00000101).
All cells of a BSC (discriminator= 00000110).
(2) Channel needed: If the BSC type supports this
parameter, the value may be SDDCH.
(3) Reserved for satellite network.
(4) Cell identifier is received in two formats:
CGI = 00000000.
LAC+CI = 00000001.
(5) Classmark2: Algorithm A5, mobile priorities, etc.
(6) SMS-MT processing (option F-SMS-007) to SDCCH
allocation.
MCC MNC LAC CI
LAI
CGI
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.11

12. 6.4 Programmable data
Paging data
Used to extend paging to all the cells of the BSCs associated with the location area, when the
first paging attempt fails.
Sys. Par.: PARNAME = RB_F_PA_001, NUM = BOOL, RTDMS Database: RELNAME=
RYR_SYSB, ATR = D_FPA001
Relevant process:
When the RCF initiates a paging procedure to a located mobile, the BSSMAP_PAGING
message is sent first to each of the BSCs having at least one cell in the mobile's location area.
If the RCF receives no response at the end of time TPAG and F-PA-002 is set to the FALSE
state, then the paging attempt is repeated. F-PA-001 operates in this precise case to define to
which cells the repeated BSSMAP_PAGING message is addressed.
The attempt is repeated NB_PAG_ATTEMPT times.
F-PA-001 is meaningless if F-PA-008 (satellite network) is set to the TRUE state.
Field values:
VRAI (TRUE): The BSSMAP_PAGING message is returned to the same BSCs as in the first
attempt. The Cell Identifier list parameter is set:
• to all cells, or
• to a restricted number of LACs and cells if F-PA-004 (BSS overload management) is set to
FAUX (FALSE): The BSSMAP_PAGING message is sent to the same BSCs as on the first
attempt and with the Cell Identifier List parameter, except in the event of congestion, in which
case the process is as defined by F-PA-004.
6.12
F-PA-001 :
the TRUE state and the BSC has declared a congestion condition.
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.12

13. 6.4 Programmable data
Paging data
6.13
NB_PAG_ATTEMPT : Number of Paging attempts.
Sys. Par.: PARNAME = NB_PAG_ATTEMPT, NUM = NUM, RTDMS
Database: RELNAME = RYR_SYSG, ATR = D_PAGRPT
Relevant process:
NB_PAG_ATTEMPT is the number of unsuccessful paging attempts
before declaring the mobile not reachable, or initiating an HPA paging.
NB_PAG_ATTEMPT is meaningless if F-PA-002 (satellite networks) is
set to FALSE.
Tip: (HPA = High Penetration Alerting)
The number of Paging attempts is the number of Pagings minus one
and, in the case of an HPA paging defined by F-PA-007 (Satellite
networks), the HPA paging attempt is not counted.
Example = D'1/ H'01
Paging number max = NB_PAG_ATTEMPT + 1
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.13

14. 6.4 Programmable data
Paging data
6.14
TPAG : Timer awaiting the response to Paging.
Sys. Par.: PARNAME = TPAG, NUM = NUM, RTDMS Database:
RELNAME = RYR_SYSG, ATR = D_T3113
Relevant process:
TPAG is the timer awaiting a response from the BSCs to the
BSSMAP_PAGING message. When the timer times out, paging is
considered to have failed.
Timer TPAG is linked to the timer controlling early ACM (RG_TACMAN), if
the early ACM procedure, conditioned by F-SW-003, is activated (see the
call handling module).
TPAG has a fixed value if F-PA-002 (satellite networks) or F-PA-007
(satellite networks) is set to the FALSE state.
If F-PA-002 or F-PA-007 is set to the TRUE state, it is strongly
recommended to activate the early ACM mechanism. Refer to F-SW-003
and RG_TACMAN.
Check that : TPAG RG_TACMAN Timer T1 in the SSP.
Example = D'4/ H'00000004 in seconds
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.14

15. 6.4 Programmable data
Search procedure
6.15
F-PA-003 : Conditions the search signalling procedure.
Sys. Par.: PARNAME = PB_F_PA_003, NUM = BOOL.
Relevant process:
The search signalling procedure is initiated if F-PA-003 is set to FALSE and if
paging needs to be executed although the VLR has not saved the mobile's
location area: in the case of a VLR restart, for example.
In this case, the MAP_SEARCH_FOR_MS message is sent by the VLR to the
RCF instead of the MAP_PAGE message to initiate a paging procedure.
If a response is received by the RCF, then the RCF returns to the VLR the
Current Location Area Id parameter duly set.
Field values:
VRAI (TRUE): The Search procedure cannot be executed and the Absent
Subscriber error is set. The system then links to call forwarding on subscriber
not reachable (if applicable) or to broadcasting of the appropriate
announcement for the No response to Paging case.
FAUX (FALSE): The search procedure can be handled by the RCF.
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.15

16. 6 Paging
6.5 Unsolicited messages
© Alcatel University - 8AS 90200 0726 VT ZZA Ed.01
6.16
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.16

17. 6.5 Unsolicited messages
6.17
PMLX/6010 :
No cell involved in paging request
PMLX/6009 :
Cell not known to RCF in message received from a BSC
PMLX/6011 :
Destination point code not declared
PMLX/6002 :
No cell in RCF (Search procedure)
PMLX/2000 :
The LAI supplied by the mobile is not known in the VLR
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.17

18. 6 paging
Evaluation
Objective: to be able to manage PLMN
common data related to paging
6.18
Thank you for answering
the self-assessment
of the objectives sheet
© Alcatel University - 8AS 90200 0726 VH ZZA Ed.01 Page 6.18