12.7a Iu mode 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 Iu mode Channel Request Description information element is sent by the mobile station to the network to request uplink resources.

Table 12.7a.1: Iu mode Channel Request Description information elements

< Iu mode Channel Request Description IE > ::=

< RB Id : bit (5) >

< RADIO_PRIORITY : bit (2) >

{ 0 | 1 < RLC_BLOCK_COUNT : bit (8) > }

{ 0 | 1 < Iu mode Channel Request Description IE > } ; — IE to be repeated only when
— in a Multiple TBF request message

Table 12.7a.2: Iu mode Channel Request Description information element details

RB Id (5 bit field)
This field indicates the radio bearer identity of the upper layer PDU that caused the Iu mode Channel Request Description IE to be transmitted.

Range: 0 to 31

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_BLOCK_COUNT (8 bit field)
If present, the RLC_BLOCK_COUNT field indicates the number of RLC data blocks that the mobile station wishes to transfer (assuming a CS-1 coding).

This field is encoded as a binary number as shown:

bit
8 7 6 5 4 3 2 1
0 0 0 0 0 0 0 0 9 RLC data blocks
0 0 0 0 0 0 0 1 10 RLC data blocks
. . .
1 1 1 1 1 1 1 1 264 RLC data blocks