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ZTE Corporation ZXG-BTS2 Benutzerhandbuch

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Chapter 4 - System Functions 
Confidential and Proprietary Information of ZTE CORPORATION 79 
Immediate Assignment 
The procedure of immediate assignment is shown in Figure 58. 
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M M E D I A T E  
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MS 
LAPD
FURRM 
PAGCHM 
LAPD 
BSC 
OAMM 
(RR) imm 
ass 
PAG_ DATA_REQ 
(PAG IMM ASS) 
(IMM ASS CMD) 
DL_DATA_IND (IMM ASS CMD) 
 
 
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 sending, the BTS 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. 
Paging 
The paging procedure is shown in Figure 59, and the MS paging response 
is shown in Figure 60.