|
2G/GSM |
||
|
Immediate Assignment
Immediate Assignement is the answering message to the initial "Channel Request" explained above. This is to say to MS "OK, I will accept your 'channel request' and here goes the radio resource you can use for the following steps".
One of the Channel Request example would be as follows. The most important thing you have to notice is that Immediate Assignment should play back the whole Channel Request message. All MS(UE) trying to connect a cell would receive the same 'Immediate Assignement', but if the 'Channel Request' portion contained in 'Immediate Assignement' does not match the Channel Request Bytes it sent, UE should discard the Immediate Assignement message since it is not for itself.
DLT: 147, Payload: gsm_a_ccch (GSM CCCH) GSM CCCH - Immediate Assignment L2 Pseudo Length 0010 11.. = L2 Pseudo Length value: 11 Protocol Discriminator: Radio Resources Management messages .... 0110 = Protocol discriminator: Radio Resources Management messages (0x06) 0000 .... = Skip Indicator: No indication of selected PLMN (0) Message Type: Immediate Assignment Page Mode .... 0000 = Page Mode: Normal paging (0) Dedicated mode or TBF 0000 .... = Dedicated mode or TBF: This message assigns a dedicated mode resource (0) Channel Description 0100 0... = SDCCH/8 + SACCH/C8 or CBCH (SDCCH/8), Subchannel 0 .... .100 = Timeslot: 4 001. .... = Training Sequence: 1 ...0 .... = Hopping channel: No .... 00.. = Spare Single channel : ARFCN 1 Request Reference Random Access Information (RA): 6 0011 1... = T1': 7 .... .010 010. .... = T3: 18 ...1 0110 = T2: 22 [RFN: 10422] Timing Advance Timing advance value: 0 Mobile Allocation Length: 0 IA Rest Octets L... ....: First Discriminator Bit: Low .L.. ....: Second Discriminator Bit: Low ..L. ....: A compressed version of the INTER RAT HANDOVER INFO message : shall not be used Padding Bits: default padding
HEX : 2D 06 3F 00 44 20 01 06 3A 56 00 00 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B
|
||
