11- omo133060 bsc6900 gsm v9r13 frequency hopping algorithm and parameters issue 1.00
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GSM Frequency Hopping Algorithm and Parameters
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. Hopping Overview
2. Hopping Classification3. Hopping Parameters
Page2
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Definition of Frequency Hopping
Page3
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Advantages of Hopping
Page4
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
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Frequency Diversity of Hopping
Page5
Smoothen the rapid fading (Rayleigh fading)
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Interference Diversity of Hopping
Page6
Smoothen and average the interference
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Contents1. Hopping Overview2. Hopping Classification
3. Hopping Parameters
Page7
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Hopping Classification
Page8
According to Implementation mode
•Baseband Hopping•RF Hopping•Hybrid Hopping
According to the Minimum Hopping Time Unit
•Timeslot Hopping•Frame Hopping
MML: SET GCELLHOPQUICKSETUP
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Baseband Hopping Principle
Page9
FH bus
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Baseband Hopping Principle BCCH carrier attends hopping, on which TS0 can not attend hopping
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No HoppingTRX0
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
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Baseband Hopping Principle BCCH carrier does not attends hopping
Page11
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
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RF Hopping Principle
Page12
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RF Hopping Principle BCCH carrier does not attends hopping
Page13
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)
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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
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overlaidUnderlaid
( 900M/850MHZ )Baseband Hopping
Overlaid( 1800M/1900MHZ )
RF Hopping
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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.
Page15
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Frame Hopping
Page16
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
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Timeslot Hopping
Page17
f 0
Frame 0
f 1
f 2
f 3
f 4
Frame 1 Frame 2 Frame 3 Frame 4 ……
•5 timeslots on 1 TRX hopping on 5 frequencies
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Contents1. Hopping Overview2. Hopping Classification3. Hopping Parameters
Page18
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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
Page19
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Hopping Parameters HSN : Hopping Sequence Number ( 0 ~ 63 )
HSN=0 : cycle hopping. HSN≠0 : random hopping. Every sequence number
corresponds a pseudo random sequence.
Page20
MML: ADD GCELLMAGRP MOD GCELLMAGRP
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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.
Page21
MML: SET GTRXCHANHOP
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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.
Page22
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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.
Page23
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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
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)
MA2={5,10,15,20}MA1={10,15,20}MAIO 0 1 2 MAIO 0 1 2 3
MAIO MA
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Example of MAIO
Page25
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
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)
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
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Example of MAIO
Page26
5Frame 0
10
15
20
25
Frame 1 Frame 2 Frame 3 Frame 4 ……
MA={5,10,15,20,25}
• 5 TRXs separately belongs to the same MA hopping on 5 frequencies, and uses same HSNs
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Example of Hopping Parameters
Page27
f 0
Frame 0
f 1
f 2
f 3
f 4
Frame 1 Frame 2 Frame 3 Frame 4 ……
• 8 timeslots of 1 TRX separately belongs to different MAs hopping on 5 frequencies, and uses different HSNs.
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Example of Hopping Parameters
Page28
f 0
Frame 0
f 1
f 2
f 3
f 4
Frame 1 Frame 2 Frame 3 Frame 4 ……
• 5 TRXs separately belongs to different MAs hopping on 5 frequencies, and uses different HSNs
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Summary The function of frequency hopping The classification of frequency hopping The realization of frequency hopping
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