Thursday, April 26, 2012


Value range: 29
Unit:  Multi-frame period (51 frames)
Content: It is Paging Channel Multi-frames. It defines the number of multi-frames used as a loop of paging sub-channels.
Recommendation: 2
This parameter specifies how many paging sub-channels are assigned in a cell. In the network, MS only monitors the paging sub-channel it belongs to while ignoring contents of others. When it becomes larger, there will be more paging sub-channels in the cell and accordingly there will be less MS in each paging sub-channel. Therefore, the bearing capability of PCH will be much more(theoretically the capacity of PCH does not increase, but the buffer that buffers paging message in each BTS is increased, which makes the sending of paging messages more even in the time and space), and the lifetime of MS battery will be longer. The value of this parameter should be as smallest as possible as long as it will not cause overload on PCH. In the operation, the PCH load should be measured regularly and the value of it should be adjusted properly according to the load. In same location area, any paging must be sent in all cells within this location area. Therefore, all cells in the same location area should have the same or nearly the same PCH capacity (number of paging sub-channels). In the area where the PCH bears a medium or large load, it is set as 6 or 7 (6 or 7 multi-frames are used as a loop of paging group). For the area with a small load, it is set as 4 or 5. Besides, it is often set as 2.
1. One paging block (four consecutive CCCH timeslots) can bear two IMSI pagings or four TMSI pagings or one AGCH immediate assignment message.
2. In idle mode, When MS camps on a cell, DSC initialized to be close to 90/N (N is BS_PA_MFRMS, with the value range: 2~9). when MS decodes the message on paging sub-channel, DSC will increase by 1 for one successfully decoding, but will not exceed initially value. If decoding fails, DSC will decrease by 4. If DSC<=0, the downlink signaling link will be announced failure, resulting in cell reselection.

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