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

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GSM Frequency Hopping Algorithm and Parameters


Contents1. Hopping Overview

2. Hopping Classification3. Hopping Parameters

Page2


Definition of Frequency Hopping

Page3


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


Frequency Diversity of Hopping

Page5

Smoothen the rapid fading (Rayleigh fading)


Interference Diversity of Hopping

Page6

Smoothen and average the interference


Contents1. Hopping Overview2. Hopping Classification

3. Hopping Parameters

Page7


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


Baseband Hopping Principle

Page9

FH bus


Baseband Hopping Principle BCCH carrier attends hopping, on which TS0 can not attend hopping

Page10

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


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


RF Hopping Principle

Page12


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)


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

Page14

overlaidUnderlaid

（ 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.

Page15


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


Timeslot Hopping

Page17

f 0

Frame 0

f 1

f 2

f 3

f 4


•5 timeslots on 1 TRX hopping on 5 frequencies


Contents1. Hopping Overview2. Hopping Classification3. Hopping Parameters

Page18


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


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


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


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


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


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


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

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


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

Page26

5Frame 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

Page27

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

Page28

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

Page29

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