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

Definition of Frequency Hopping

Advantages of Hopping

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

Smoothen the rapid fading (Rayleigh fading)

Interference Diversity of Hopping

Smoothen and average the interference

Contents1. Hopping Overview2. Hopping Classification

3. Hopping Parameters

Hopping Classification

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

FH bus

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

No HoppingTRX0

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

TS 0 TS 1 TS 2 TS 3 TS 4 TS 5 TS 6 TS 7

MA={10,15,20}

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

RF Hopping Principle BCCH carrier does not attends hopping

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}

(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

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

Frame Hopping

Frame 0

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

Frame 0

•5 timeslots on 1 TRX hopping on 5 frequencies

Contents1. Hopping Overview2. Hopping Classification3. Hopping Parameters

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

Hopping Parameters HSN ： Hopping Sequence Number （ 0 ～ 63 ）

HSN=0 ： cycle hopping. HSN≠0 ： random hopping. Every sequence number

corresponds a pseudo random sequence.

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.

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.

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.

Example of MAIO

No Hopping

1 2 2 2

2 2 3 2

3 2 0 2

0 2 1 2

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

No Hopping 0 2 1 2

1 2 2 2

0 1 1 2 2 2

2 2 3 2

1 1 2 2 3 2

3 2 0 2

2 1 3 2 0 2

0 2 1 2

0 3 1 3 2 3 3 3 0 3

2 3 3 3

1 3 2 3 3 3 0 3

3 3 0 3

2 3 3 3 0 3

0 3 1 3

3 3 0 3

1 3 2 3

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)

Example of MAIO

5Frame 0

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

Frame 0

• 8 timeslots of 1 TRX separately belongs to different MAs hopping on 5 frequencies, and uses different HSNs.

Example of Hopping Parameters

Frame 0

• 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

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

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