11.2.36 Packet CS Command

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

This optional message is sent by the network on the PACCH to encapsulate RR control messages. This message may be segmented across more than two RLC/MAC control block by using extended RLC/MAC control message segmentation.

Message type: PACKET CS COMMAND

Direction: network to mobile station

Classification: non distribution message

Table 11.2.36.1: Packet CS Command information elements

< Packet CS Command message content > ::=

< PAGE_MODE : bit (2) >

{ < GLOBAL_TFI : < Global TFI IE > >

{ < spare : bit (2) >

< CONTAINER_LENGTH : bit (8) >

< CONTAINER_DATA : octet ** >
< padding bits >

! < Non-distribution part error : bit (*) = < no string > > }

! < Address information part error : bit (*) = < no string > > }

! < Distribution part error : bit (*) = < no string > > ;

Table 11.2.36.2: Packet CS Command information element details

The Packet CS Command message encapsulates RR control message (e.g. DTM ASSIGNMENT COMMAND, IMMEDIATE ASSIGNMENT or IMMEDIATE ASSIGNMENT REJECT).

PAGE_MODE (2 bit field)
This field is defined in sub-clause 12.20 and gives the PAGE_MODE parameter valid in the serving cell.

Global_TFI
This information element contains the TFI of the mobile station’s downlink TBF or uplink TBF. This field is defined in sub-clause 12.10.

CONTAINER_LENGTH (8 bit field)
This field indicates the number of CONTAINER_DATA octets that form the specific RR control message and is coded as shown below.

Bit

8 7 6 5 4 3 2 1

0 0 0 0 0 0 0 0 No CONTAINER_DATA follows; Spare padding is used to fill the rest of the message;

0 0 0 0 0 0 0 1 CONTAINER_DATA length = 1 octet;

….

1 0 1 0 1 0 0 0 CONTAINER_DATA length = 168 octets;

All other values reserved. If a reserved value is received the contents of the container shall be discarded.

CONTAINER DATA (n*8 bits)
The CONTAINER DATA octets forms the actual RR control message content. The information contained in the Packet CS Command message shall exclude the following information elements from the beginning of the RR control message: L2 Pseudo Length; RR management Protocol Discriminator and Skip Indicator.

Extra octets of padding bits at the end of the RR control message may be excluded.