Parameter Name |
Release Delay of Downlink TBF(ms) |
|---|---|
Description |
This parameter specifies the release delay of the downlink TBF. After sending the last downlink RLC data block and confirming that all downlink data blocks are received, the network does not immediately notify the MS of releasing this TBF but forcedly set the last data block not received. Therefore, keep this TBF unreleased by continuously resending the last downlink data block with the Relative Reserved Block Period (RRBP) flag. During the release delay of a downlink TBF, as long as the upper layer of the network has a requirement of downlink data transmission, the extracted downlink RLC blocks can be sent on this downlink TBF. At the same time, the status of the downlink TBF changes from release delay to downlink transmission. In addition, during the release delay, the MS must send the Packet Downlink Ack/Nack message on the uplink data block corresponding to the RRBP to maintain the communication with the network. Therefore, when the MS needs to send the uplink data, it can send an uplink request through Channel Request Description carried in the Packet Downlink Ack/Nack message. The value 0 specifies that release delay function of the downlink TBF is disabled. |
GUI Value Range |
[0,5000] |
Default Value |
2400 |
Unit |
Milliseconds |
Step |
- |
Modification Rules |
None |
Configuration Policy |
If this parameter is set to a higher value, this wastes the wireless resources and influences the the access performance of other MSs in the network, thus causing the useless signaling seizing the channel bandwidth and wasting the downlink resources. If this parameter is set to a lower value, the uplink TBF frequently releases and establishes, thus increasing the delay for the delay tests of the Attach and Ping services. The original downlink TBF is released immediately and cannot be used to transmit subsequent downlink data. Therefore, a new TBF must be established. The original downlink TBF also cannot be used for a new requirement of uplink data transmission. Therefore, the duration and success rate of the TBF establishment are greatly affected. |
Recommended Value |
2400 |
Parameter Relationship |
None |
BSC Feature |
GPRS&EGPRS |
Parameter Class |
Parameters About Radio Resources |
Caution |
None |