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