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Chapter 4 - System Functions 

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When the TRX receives the MS random access request, it sends the 

channel request message to the BSC. 

The CHAN RQD message contains the Request Reference parameter (MS-

selected random number, low-order bit of the TDMA frame number) and 
access burst pulse sequence measurement delay. 

Immediate Assignment 

The procedure of immediate assignment is shown in Figure 49. 

MS

LAPDm

FURRM

PAGCHM

LAPD

BSC

OAMM

(RR) im m  ass

PAG_ DATA _REQ 

(PAG IM M  ASS)

(IM M   ASS  CM D) 

DL_DATA _IND (IM M  ASS CM D)

 

The immediate assignment message is transmitted in the downlink CCCH 
(AGCH) channel. 

The immediate assignment message that is from the network side may be 
(RR) IMMEDIATE ASSIGNMENT, (RR) IMMEDIATE ASSIGNMENT 

EXTENDED or (RR) IMMEDIATE ASSIGNMENT REJECT. On the Abis 
interface, it is contained in the IMM ASS CMD message, which contains 

complete the “immediate assignment” message and where the “paging 
mode” unit is set as “unchanged”. When this message is received, the 
FURRM sends it to the PAGCHMan sub-module of the PAGCHM module. 

That sub-module places the message in the buffer. When the trigger is 
received from the ISR, the PAGCHDaemon sub-module of the PAGCHM 

module forms the messages in the waiting queue into the (RR) IMMEDIATE 
ASSIGNMENT EXTENDED or (RR) IMMEDIATE ASSIGNMENT REJECT 

message and sends to the CHP. Before the send, the OB06 changes the 
“paging mode” 

If no channel can be assigned, the BSC sends the (RR) IMMEDIATE 
ASSIGNMENT REJECT on the same CCCH timeslot where the channel 
request message is received. 

If the downlink CCCH is overloaded, the FURRM sends the DELETE IND 
message to the BSC, notifying that an IMM ASS CMD command is deleted.