Frequency Hopping Parameter modify procedure

Frequency Hopping Parameter modify

procedure

When opening Frequency Hopping, some parameters must be

modified.

1.

Hopping Enabled:

Description: Whether to use Frequency Hopping.

Value range: 0: Hopping Disabled

1: Hopping Enabled

This parameter must be set 1 in all sites which want to be opened

Frequency Hopping.

2.

MA(Mobil Allocation)

Description: A list of absolute RF numbers of each frequency node situated in the jumper group.

When informing the channels that MS should use, inform relevant messages to MS.

Value range: Exceeding no more than 64

MA use 984—1007 in Islamabad and Karachi

MA use 1002—1007 in Lahore

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Frequency Hopping Parameter modify procedure

3.

HSN(Hopping Sequence Number)

Description: According to the jumper algorithm specified by GSM specifications 05.02, MAI is

either FN (or RFN) of TDMA, and the function of HSN and Mobile Allocation Index

Offset (MAIO), where HSN determines the track where frequency nodes run in the

course of jumping. Frequency nodes near to each other employ different cells of MA.

The employment of different jumper sequence numbers can make sure that the

frequency nodes don't collide each other in their usage. Different timeslots can share a

group of MAs and corresponding HSNs. The only difference is that MAIO is put in

the attribute of timeslots.

Value range: 0~63

Refer to Frequency Hopping Plan for detailed data.

4.

MAIO(Mobile Allocation Index Offset)

Description: According to the jumper algorithm specified by GSM specifications 05.02, MAI is

either FN (or RFN) of TDMA, and the function of HSN and Mobile Allocation Index

Offset (MAIO), where HSN determines the track where frequency nodes run in the

course of jumping. Frequency nodes near to each other employ different cells of MA.

The employment of different jumper sequence numbers can make sure that the

frequency nodes don't collide each other in their usage. Different timeslots can share a

group of MAs and corresponding HSNs. The only difference is that MAIO is put in

the attribute of timeslots.

Value range: 0~63

Refer to Frequency Hopping Plan for detailed data.

5.

Allow Downlink DTX

Description: The application of DTX downlinks is a selectable process of BSC. The

discontinuous transmission (DTX) is the process in which the system doesn't

transmit signals during the voice intermission when users are

communicating. This parameter takes part in the control in the downlink

whether DTX is used. Actually, whether to apply DTX in the downlink (in

sending BTS the CHANNEL ACTIVATION message and the MODE

MODIFY message) is decided by this parameter and the indication whether

to apply it in the downlink related to MS in the ASSIGNMENT REQUEST

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Frequency Hopping Parameter modify procedure

message and the HANDOVER REQUEST message.

Value range: True: Apply DTX in the downlink direction;

False: Not to apply DTX in the downlink direction;

This parameter must be set True in all sites which want to be

opened Frequency Hopping for lower the impact of Co-channel

and Adjacent-channel Interference.

6.

Allow Downlink Power Control

Description: Whether to use power control in the downlink direction of the cell, i.e., whether

to implement power control on BTS.

Value range: True: Control the downlink power

False: Not to control the downlink power

This parameter must be set True in all sites which want to be

opened Frequency Hopping for lower the impact of Co-channel

and Adjacent-channel Interference.

2004-10-5

Appendix: Paktel EGSM frequency hopping plan (three big cities)

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