1

Timeslot (radio and Abis) for GPRS/EGPRS services

Huawei/Vodafone Optimization

2

Coding Scheme mapping

Coding Scheme Abis TS (Sub)

CS1 1

CS2 1

CS3 2

CS4 2

MCS1 1

MCS2 1

MCS3 2

MCS4 2

MCS5 2

MCS6 2

MCS7 3

MCS8 4

MCS9 4

3

Coding Schemes

GPRS:

CS1: 8.0 kbps

CS2: 12.2 kbps

CS3: 14.4 kbps

CS4: 20.2 kbps

EGPRS:

MCS1: 8.8 kbps

MCS2: 11.2 kbps

MCS3: 14.8 kbps

MCS4: 17.6 kbps

MCS5: 22.4 kbps

MCS6: 29.6 kbps

MCS7: 44.8 kbps

MCS8: 54.4 kbps

MCS9: 59.2 kbps

4

Dynamic conversion between TCH and PDCH

to reduce the impact of GPRS services on GSM voice services, Huawei GPRS BSS Supports dynamic conversion between TCH and PDCH

In GPRS BSS channels are classified into fixed channels, voice channels and dynamic channels

fixed packet channels (PBCCH, PCCCH, PDCCH, PDTCH)

fixed voice channels (TCH, BCCH, SDCCH)

Dynamic channels (TCH, PDCH)

5

1. Channel Type

For built-in PCU case

If channel type is set to TCH Full Rate, the BSC supports overall dynamic PDCH and PDTCH may not be configured

GPRS/EGPRS Important parameters

6

2. Maximum Ratio Threshold of PDCH in a cell

this parameter sets the maximum number or ratio of PDCH allowed in a cell

The total number of TCHs and PDCHs available in a cell is fixed. The PDCH ratio is equal to PDCHs / (TCH/Fs + static PDCHs). This parameter determines the proportion of PDCHs to the total number of TCHs + PDCHs

Actual Value Range (0-100)

GUI Value Range (0-100)

Default value (30)

GPRS/EGPRS Important parameters

7

3. PDCH downlink/uplink Multiplex Threshold

this parameter sets the capability of a cell to process packet services

The downlink PDCH can carry a maximum of (threshold/10) TBFs

Actual value range (10-160)

GUI value range (10-160)

Default value (80)

The uplink PDCH can carry a maximum of (threshold/10) TBFs

Actual value range (10-70)

GUI value range (10-70)

Default value (70)

GPRS/EGPRS Important parameters

8

4. Downlink/Uplink Multiplex Threshold of Dynamic Conversion

This parameter specifies the downlink multiplex threshold of dynamic channel conversion.

When the number of subscribers carried over the channel reaches the threshold/10, dynamic channels are used.

Downlink:

Actual value range (10-80)

GUI value range (10-80)

Default value (20)

Uplink:

Actual value range (10-70)

GUI value range (10-70)

Default value (20)

GPRS/EGPRS Important parameters

9

5. Level of Preempting Dynamic channel and Reservation Threshold of Dynamic channel conversion

When voice service is busy, the BSC convert PDCH into TCH

Voice services take priority over packet services to guarantee the QOS of voice services

These 2 parameters sets the capability of a cell to preempt PDCH

Level of Preempting Dynamic channel:

This parameter specifies the levels of dynamic channels preempted by CS services and PS services. Only full-rate TCHs are the dynamic channels that can be preempted

Actual value range (0,1,2)

GUI value range (all dynamic channels can be preempted, control channels cannot be preempted, dynamic channels carrying services cannot be preempted)

Default value (all dynamic channels can be preempted)

Reservation Threshold of Dynamic channel conversion:

This parameter specifies the number of channels reserved for the CS services.

Actual value range (0-8)

GUI value range (0-8)

Default value (2)

Caution: This parameter is invalid when "Level of Preempting Dynamic Channel" is set to "All dynamic channels can be preempted".

GPRS/EGPRS Important parameters

10

6. Initial coding schemes parameters and dynamic rate adjustments parameters

GPRS:

Downlink CS default type

Uplink CS default type

Downlink fixed CS type

Uplink fixed CS type

EGPRS:

Downlink MCS default type

Uplink MCS default type

Downlink fixed MCS type

Uplink fixed MCS type

GPRS/EGPRS Important parameters