12.7 Channel Request Description

3GPP44.060General Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 17TS

The Channel Request Description information element is sent by the mobile station to the network to request uplink resources.

Table 12.7.1: Channel Request Description information elements

< Channel Request Description IE > ::=

< PEAK_THROUGHPUT_CLASS : bit (4) >

< RADIO_PRIORITY : bit (2) >

< RLC_MODE : bit (1) >

< LLC_ PDU_TYPE : bit (1) >

< RLC_OCTET_COUNT : bit (16) > ;

Table 12.7.2: Channel Request Description information element details

PEAK_THROUGHPUT_CLASS (4 bit field)
This field indicates the peak throughput class for the PDP context of the LLC PDU that caused the Channel Request Description IE to be transmitted. The field is coded as the binary representation of the Peak Throughput Class specified in 3GPP TS 24.008.
Range: 1 to 9

RADIO_PRIORITY (2 bit field)
This field indicates the Radio Priority of the requested TBF. The field is encoded as the Radio Priority field of the Packet Channel Request (see sub-clause 11.2.5).

RLC_MODE (1 bit field)
This field indicates the RLC mode of the requested TBF.

0 RLC acknowledged mode
1 RLC unacknowledged mode

LLC_ PDU_TYPE (1 bit field)
This field indicates the type of the first LLC PDU to be transmitted over the requested uplink TBF.

0 LLC PDU is SACK or ACK
1 LLC PDU is not SACK or ACK

RLC_OCTET_COUNT (16 bit field)
The RLC_OCTET_COUNT field indicates the number of RLC data octets, plus the number of RLC data block length octets, that the mobile station wishes to transfer. The value ‘0’ indicates that the mobile station does not provide any information on the TBF size.
Range 0 to 65535