Double-timeslot extension cell? Start
Yes Multi-band cell or nor?
Is the MS band support capability known?
Main BCCH TRX band and TRX of the band being compatible with the main
BCCH TRX
Bands supported by the MS
Select the double-timeslot extension TRX
TA>63?
Concentric cell or not?
Specify the TRX of the concentric subcell attribute
TRX supporting the EGPRS Do the MS and cell support
the EGPRS? End Yes No Yes No Yes No No Yes No Yes No Yes No Specify the overlaid
subcell or underlaid subcell?
z The procedure for obtaining the assignable TRX is as follows:
TRX requirement: To allocate the PDCH for MSs, check whether the cooperative
TBF exists according to the ingress TRX index. If yes, allocate the PDCH for the MS on the specified TRX.
For a multi-band cell, the capability of the MS supporting the frequency bands
must be taken into account when assigning the PDCHs.
If the BSC does not know the radio access capability of the MS, only the
PDCHs over the main BCCH frequency band and the frequency bands compatible with the main BCCH frequency band should be assigned.
If the BSC knows the radio access capability of the MS, only the PDCHs
over the frequency bands supported by the MS are assigned.
If the cell is a double timeslot extended cell as defined by the cell attribute
parameter 【Cell Ext Type】, and if the TA reported by the MS is greater than 63, then the PDCHs on a double timeslot extended TRX should be assigned to the MS.
If the cell is a concentric cell as defined by the cell attribute parameter 【Cell
Type】, and if the BSC specifies the overlaid subcell or underlaid subcell upon a
PDCH request, then the PDCHs on an overlaid TRX or underlaid TRX should be assigned accordingly. If the overlaid subcell or underlaid subcell is not specified, the PDCHs on a concentric TRX should be assigned without specific tendency.
In the case of applying for the allocation of channels, the service type (EDGE or
GPRS service, or EDGE + GPRS service) is contained. According to the TRX attribute parameter 【TRX capability】, the TRX supporting the EGPRS is selected if the MS and cell support the EGPRS.
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Obtaining the
Allocable Channel
Start
Y e s
Is the idle PDCH with normal status & available Abis timeslot & channel priority meeting the service requirement available?
Does the number of MSs multiplexed on the PDCH reach the threshold?
The corresponding PDCH is unavailable
Allow E Down G Up Switch?
Perform processing related to Prohibit E Down G Up Switch?
End Yes
No Perform polling for all PDCHs
Match the service type to the channel priority type
No
Yes Yes
No
z To obtain the assignable channels, do as follows:
Check whether the channel type of the sub timeslot is PDCH.
Check whether the valid status of the PDCH is configured, that is, whether the
location occupied by the channel can be replaced. If it is not configured, it is unavailable. If it is configured, it is available.
Obtain the management status of the current channel. Check the channel
management status. If the channel is in the blocked state, do not perform the processing.
Check the resource status recorded through 8 bits on the left and the control
status recorded through 8 bits on the right. Make sure that they are normal.
Check whether the main control status of the channel is in the idle state.
Check whether the channel recorded in the radio resource management module
is available.
Make sure that the number of available Abis is not zero. Check whether the channel priority meets the service type.
For GPRS services, the GPRS channel group, EGPRS normal channel
group, and EGPRS priority channel group can be allocated.
For EDGE services, the EGPRS special channel group, EGPRS normal
channel group, and EGPRS priority channel group can be allocated.
z According to the cell attribute parameter 【 PDCH Uplink/Downlink Multiplex 】
Threshold, make sure that the number of MSs multiplexed on the channel does not reach the upper threshold.
For the PBCCH or PCCCH, the number of MSs multiplexed on the channel must
be smaller than 7.
Otherwise, the number of MSs multiplexed on the uplink PDTCH should be equal
to or smaller than 7, and the number of MSs multiplexed on the downlink PDTCH should be equal to or smaller than 8. In the latest version, the downlink PDTCH supports 16 MSs.
z Match the service type with the channel priority type:
The GPRS services cannot occupy the EGPRS special channels.
If an EGPRS priority channel bears the EGPRS services, the EGPRS priority
channel cannot be assigned to the GPRS services.
z Make decision according to the BSC attribute parameter 【 Allow E Down G Up Switch 】. If the switch is off (that is, the EGPRS OFF GPRS ON is prohibited),
If a channel carries the EGPRS downlink services, the channel cannot be
assigned to the GPRS uplink services.
If a channel carries the GPRS uplink services, the channel cannot be assigned to
the EGPRS downlink services.
z Obtain the assignable channel groups.
If an available channel exists according to the preceding decision, obtain all
channel groups that can be allocated to MSs based on the MS multi-timeslot capability.
Page16 Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
Data Configuration
z PDCH Uplink Multiplex Threshold
Description: This parameter specifies the PDCH uplink multiplex threshold.The
uplink PDCH can carry a maximum of (threshold/10) TBFs.
Value Range: [10,70] Default Value: 70
Configuration Policy: If this parameter is set to a lower value, the TBFs
established on the PDCH and the subscribers are fewer, and the uplink
bandwidth for each subscriber is higherIf this threshold is set to a higher value, the TBFs established on the PDCH and the subscribers are more, and the uplink bandwidth for each subscriber is lower.
z PDCH Downlink Multiplex Threshold
Description: This parameter specifies the PDCH downlink multiplex
threshold.The downlink PDCH can carry a maximum of (threshold/10) TBFs.
Value Range: [10,160] Default Value: 80
Configuration Policy: If this parameter is set to a lower value, the TBFs
established on the PDCH and the subscribers are fewer, and the downlink bandwidth for each subscriber is higher.If this threshold is set to a higher value, the TBFs established on the PDCH and the subscribers are more, and the downlink bandwidth for each subscriber is lower.
Page17 Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
Data Configuration
z Allow E Down G Up Switch
Description: This parameter specifies whether to enable the multiplexing of
EDGE download and GPRS upload onto the same channel. If this parameter is set to Open, the EDGE download and GPRS upload can use the same
channel;If this parameter is set to Close, the EDGE download and GPRS upload cannot use the same channel.In dynamic allocation or extended dynamic mode, the downlink block must use the GMSK coding scheme (including CS1-4, MCS1-4) to detect the USF assigned for the uplink by the GPRS MS. Then, the downlink cannot use the high-rate coding scheme, thus decreasing the EGPRS rate.If the Allow E Down G Up Switch is set to Open, this can prevent the EGPRS downlink and GPRS uplink from multiplexing the same channel to ensure the EGPRS rate. However, the channel needs to be properly allocated, the GPRS channel configured is to prevent decreasing the access of the GPRS MS due to no GPRS channel.If the Allow E Down G Up Switch is set to Close, the downlink uses the GMSK coding scheme, thus decreasing the EGPRS rate.At present, this parameter is usually set to Open.
Value Range: [Open,Close] Default Value: Open
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