Parameter Name |
T3192 |
|---|---|
Description |
This parameter specifies the timer set for the MS to wait for the TBF release after receiving the last data block. When the MS receives the last RLC data block carrying the last block flag (FBI=1) and confirms that all the RLC data blocks on the TBF are received, the MS sends the Packet Downlink Ack/Nack message carrying the final acknowledgement flag (FAI=1) and starts T3192 at the same time. If T3192 expires, the MS releases the TBF resources and monitors paging channels. During the TBF release process, if the MS is in half-duplex mode and receives the Packet Uplink Assignment message, the MS responds immediately. If the MS does not receive the Packet Uplink Assignment message during the TBF release process, the MS enters the packet idle mode. If the MS is in dual transfer mode, it enters the dedicated mode. |
GUI Value Range |
[500,1000,1500,0,80,120,160,200] |
Default Value |
500 |
Unit |
Milliseconds |
Step |
- |
Modification Rules |
None |
Configuration Policy |
If this parameter is set to a higher value, the TBF resources (including TFI and timeslots) are reserved for a long time. If no downlink data needs to be sent, many resources are not used but occupied for a long time. If the timer is set to a smaller value, the MS releases the TBF resources within a shorter period. However, if the network sends new downlink PDU data packets, the network must initiate a paging or immediate assignment procedure. Therefore, the downlink TBF establishment takes a longer period. If the download data packets from the network are not received and T3192 does not expire, the network directly sends a Packet Downlink Assignment message to establish a new downlink TBF, thus shortening the TBF establishment time. On one hand, the value of the T3192 timer depends on the average transmission interval between two successive downlink data. On the other hand, you need to comprehensively analyze the traffic models of the cell and take the service load of the cell into consideration. When network resources are sufficient, that is the GPRS congestion rate is low, the T3192 should be set to a large value, shortening the time to establish new TBFs and improving data transmission rate. |
Recommended Value |
500 |
Parameter Relationship |
None |
BSC Feature |
GPRS&EGPRS |
Parameter Class |
Parameters About Radio Resources |
Caution |
None |