Parameter Name |
Link Quality Control Mode |
|---|---|
Description |
This parameter specifies the mode of controlling the quality of links. During the data transmission process, the modulation scheme and coding scheme can be changed to dynamically adapt to the radio transmission environment, thus improving the quality of links. - Setting and effect Link Adaption (LA): The network dynamically adjusts the coding scheme of a channel based on the transmission quality of the channel link. The link quality is determined by 8PSK MEAN BEP and 8PSK CV BEP carried in the Packet EGPRS Downlink Ack/Nack message. The network selects a proper coding scheme for transmission based on the measurement reports from the MS. For cells with good Um interface quality, the LA mode is usually used. Incremental Redundancy (IR): The network should retransmit only different data blocks with the puncturing coding scheme. The MS buffers the history error information and the data blocks are retransmitted through combined error correction. In the cell with bad Um interface quality, the IR mode can achieve good transmission quality, but the MS must support this mode. For cells with bad Um interface quality, the IR mode is usually used. |
GUI Value Range |
[IR,LA] |
Default Value |
IR |
Unit |
None |
Step |
- |
Modification Rules |
None |
Configuration Policy |
None |
Recommended Value |
LA |
Parameter Relationship |
None |
BSC Feature |
EGPRS |
Parameter Class |
Parameters About Radio Resources |
Caution |
None |