11- OMO133060 BSC6900 GSM V9R13 Frequency Hopping Algorithm and Parameters ISSUE 1.00.ppt

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GSM Frequency
Hopping Algorithm
and Parameters

Contents
1. Hopping Overview
2. Hopping Classification
3. Hopping Parameters
Page1

Definition of Frequency Hopping
Page2

Advantages of Hopping
Page3
 Provide a similar
communication quality
for every user
 Tighter reuse
patterns are
possible to be
used for larger
capacity
 Get an
agreeable
radio
environment Advantages
of Hopping

Frequency Diversity of Hopping
Page4
Smoothen the rapid fading (Rayleigh fading)

Interference Diversity of Hopping
Page5
Smoothen and average the interference

Contents
1. Hopping Overview
Page6

Hopping Classification
Page7
According to Implementation mode
•Baseband Hopping
•RF Hopping
•Hybrid Hopping
According to the Minimum
Hopping Time Unit
•Timeslot Hopping
•Frame Hopping
MML: SET GCELLHOPQUICKSETUP

Baseband Hopping Principle
Page8
FH bus

 BCCH carrier attends hopping, on which TS0 can not attend hopping
Page9
No Hopping
TRX0
TRX1
TRX2
TRX3
TS 0 TS 1 TS 2 TS 3 TS 4 TS 5 TS 6 TS 7 ARFCN
5(BCCH carrier)
10(TCH carrier)
15(TCH carrier)
20(TCH carrier)
MA={5,10,15,20}
MA={10,15,20}
MML: SET GCELLHOPQUICKSETUP

 BCCH carrier does not attends hopping
Page10
TRX0
TRX1
TRX2
TRX3
TS 0 TS 1 TS 2 TS 3 TS 4 TS 5 TS 6 TS 7
MA={10,15,20}
ARFCN
5(BCCH carrier)
10(TCH carrier)
15(TCH carrier)
20(TCH carrier)
No Hopping No Hopping No Hopping No Hopping No Hopping No Hopping No Hopping No Hopping

RF Hopping Principle
Page11

RF Hopping Principle
 BCCH carrier does not attends hopping
Page12
TRX0
TRX1
TRX2
TRX3
TS 0 TS 1 TS 2 TS 3 TS 4 TS 5 TS 6 TS 7
No Hopping No Hopping No Hopping No Hopping No Hopping No Hopping No Hopping No Hopping
MA={10,15,20}
MA={10,15,20}
MA={10,15,20}
(BCCH carrier)
(TCH
carrier)

Hybrid Hopping
 In hybrid FH, some TRXs adopt RF FH and other TRXs adopt
baseband FH in a cell.
 One TRX, however, can adopt either RF FH or baseband FH.
 Generally, hybrid FH is applicable to co-BCCH cells
Page13
overlaid
Underlaid
（900M/850MHZ）
Baseband Hopping
Overlaid
（1800M/1900MHZ）
RF Hopping

Hopping Classification
 Frame hopping
 Frequency changes every TDMA frame.
 The different channel of one TRX uses the same MAIO.
 Timeslot hopping
 Frequency changes every timeslot.
 The different channel of one TRX uses the different MAIO.
Page14

Frame Hopping
Page15
f 0
Frame 0
f 1
f 2
f 3
f 4
Frame 1 Frame 2 Frame 3 Frame 4 ……
One TRX (none BCCH carrier) hopping on 5 frequencies
•RF hopping and baseband hopping without BCCH carrier

Timeslot Hopping
Page16
f 0
Frame 0
f 1
f 2
f 3
f 4
•5 timeslots on 1 TRX hopping on 5 frequencies

Contents
1. Hopping Overview
Page17

Hopping Mode
 All the parameters which are related to hopping are
configured in Cell Attributes/Frequency Hopping.
 Hopping mode: the mode used by the BTS system
 No hopping
 Baseband hopping
 RF hopping
 Hybrid hopping
Page18

Hopping Parameters
 HSN：Hopping Sequence Number（0～63）
 HSN=0：cycle hopping.
 HSN≠0：random hopping. Every sequence number
corresponds a pseudo random sequence.
Page19
MML: ADD GCELLMAGRP
MOD GCELLMAGRP

Hopping Parameters
 MA (Mobile Allocation Set):
 MA is the set of available RF bands when hopping, containing at most 64
frequency carriers. The frequency being used must be those of the available
frequency
 MAIO (Mobile Allocation Index Offset)
 MAIO is used to define the initial frequency of the hopping.
 Be careful to configure the MAIO of same timeslot in all channels, otherwise
interference occurs.
 MAI (Mobile Allocation Index)
 At the air interface, the frequency used on a specific burst is an element in MA
set. MAI is used for indication, referring to a specific element in the MA set.
 MAI is the function of TDMA FN, HSN and MAIO.
Page20
MML: SET GTRXCHANHOP

Data Configuration of FH
 There are two ways to configure frequency hopping:
 1. In active mode, run SET GCELLHOPQUICKSETUP can
complete the data configuration quickly.
 The system will set MA, HSN and MAIO automatically.
Page21

Data Configuration of FH
 There are two ways to configure frequency hopping:
 2. In inactive mode, we can set those parameters manually.
 2.1. Run DEA GCELL to deactivate the cell.
 2.2. Run ADD GCELLMAGRP to add a FH group.
 2.3. Run SET GCELLHOPTP to set the FH type of the cell.
 2.4. Run SET GTRXHOP to set the FH type of a TRX.
 2.5. Run SET GTRXCHANHOP to set the MAIO of a channel.
 2.6. Run ACT GCELL to activate the cell.
Page22

Example of MAIO
Page23
No
Hopping
0 2 1 2 2 2 3 2 0 2 1 2 2 2
0 1 1 2 2 2 3 2 0 2 1 2 2 2 3 2
1 1 2 2 3 2 0 2 1 2 2 2 3 2 0 2
2 1 3 2 0 2 1 2 2 2 3 2 0 2 1 2
TRX0
TRX1
TRX2
TRX3
5(BCCH carrier)
10(TCH carrier)
15(TCH carrier)
20(TCH carrier)
MA2={5,10,15,20}
MA1={10,15,20}
MAIO 0 1 2 MAIO 0 1 2 3
MAIO MA

Example of MAIO
Page24
No Hopping 0 2 1 2 2 2 3 2 0 2 1 2 2 2
0 1 1 2 2 2 3 2 0 2 1 2 2 2 3 2
1 1 2 2 3 2 0 2 1 2 2 2 3 2 0 2
2 1 3 2 0 2 1 2 2 2 3 2 0 2 1 2
0 3 1 3 2 3 3 3 0 3 1 3 2 3 3 3
1 3 2 3 3 3 0 3 1 3 2 3 3 3 0 3
2 3 3 3 0 3 1 3 2 3 3 3 0 3 1 3
3 3 0 3 1 3 2 3 3 3 0 3 1 3 2 3
TRX0
TRX1
TRX2
TRX3
5(BCCH carrier)
10(TCH carrier)
15(TCH carrier)
20(TCH carrier)
MA2={5,10,15,20}
MA1={10,15,20}
MA3={510,515,520,525}
510(TCH carrier)
515(TCH carrier)
520(TCH carrier)
525(TCH carrier)
TRX4
TRX5
TRX6
TRX7

Example of MAIO
Page25
5
Frame 0
10
15
20
25
MA={5,10,15,20,25}
• 5 TRXs separately belongs to the same MA hopping on 5
frequencies, and uses same HSNs

Example of Hopping Parameters
Page26
f 0
Frame 0
f 1
f 2
f 3
f 4
• 8 timeslots of 1 TRX separately belongs to different MAs hopping
on 5 frequencies, and uses different HSNs.

Example of Hopping Parameters
Page27
f 0
Frame 0
f 1
f 2
f 3
f 4
• 5 TRXs separately belongs to different MAs hopping on 5
frequencies, and uses different HSNs

Summary
 The function of frequency hopping
 The classification of frequency hopping
 The realization of frequency hopping
Page28

11- OMO133060 BSC6900 GSM V9R13 Frequency Hopping Algorithm and Parameters ISSUE 1.00.ppt

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