Parameter Name |
BS_CV_MAX |
|---|---|
Description |
This parameter specifies the maximum countdown value of the MS. This parameter determines BS_CV_MAX and is used for the MS to calculate the CV. The parameter also determines the duration of the T3198 timer. Every time the MS sends an uplink RLC data block, the receive state of the data block is set to Pending and the T3198 is started. If the MS receives a Packet Uplink Ack/Nack message before T3198 expires, it updates the receive state of each uplink RLC data block based on the acknowledgment bitmap contained in the message. If T3198 for the RLC data block in the Pending state expires, the MS sets the receive state of this data block to Nack and retransmits the data block. |
GUI Value Range |
[0,15] |
Default Value |
10 |
Unit |
None |
Step |
- |
Modification Rules |
None |
Configuration Policy |
If the value of this parameter is set to a modest value, the MS may retransmits the RLC data block before the BSC sends an Uplink Acknowledgment message. Thus, many radio resources are not used but occupied. If this parameter is set to an excessive value, the speed of the sliding window decreases and the probability of the uplink TBF transmission countdown increases, thus decreasing the performance of uplink transmission. To make this value more accurate, you need to estimate the delay in the transmission between the MS and the BSC6 first. This value is set based on the transmission delay. |
Recommended Value |
Generally, the empirical value of this transmission delay is 200 ms. Therefore, BS_CV_MAX should not be smaller than 10.For satellite cells, this transmission delay is usually longer than 600 ms. Therefore, BS_CV_MAX should be set to 15. |
Parameter Relationship |
None |
BSC Feature |
GPRS&EGPRS |
Parameter Class |
Parameters About Radio Resources |
Caution |
None |