On-Demand PDCHs

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General on-demand PDCH allocation as a new PSET (not for individual MS support), can be performed only in the BCCH frequency band if the parameter MBCRAC is set to 0 (default value). To allow general on demand allocation of PDCHs in other bands in a cell MBCRAC must be set to 1 or 2.

Extension of an already existing on-demand PSET is however generally allowed regardless of the MBCRAC setting.

The maximum number of on-demand PDCHs per channel group can be limited by the parameter ODPDCHLIMIT.
At allocation of on-demand PDCHs, the requested number of channels (or as many as available and allowed) are selected within the allowed frequency band(s) and subcell(s) according to the following algorithm:
1 In the case of adding PDCHs to a PSET, then select the TCHGRP where the other PDCHs in the PSET are located. Then proceed to step 10.

2 Among all TCHGRPs, select the TCHGRPs that have the best idle rank value for E-TCH.

3 Among these TCHGRPs, select the TCHGRPs that have the best idle rank value for G-TCH.

4 Among these TCHGRPs, select the TCHGRPs that have the best idle rank value for B-TCH.
5 Among these select the TCHGRP(s) that fulfils the operator chosen strategy regarding non hopping TCH on the BCCH frequency, according to parameter CSPSALLOC.

6 If the function Idle Channel Measurements is active, select among these TCHGRPs the TCHGRPs with the lowest interference level. (This refers to the channel with the highest interference level within the TCHGRP.)

7 If frequency hopping is used, select among these TCHGRPs the TCHGRPs hopping over as many frequencies as possible.

8 Among these TCHGRPs select ones in the non BCCH frequency band first, and the BCCH band as second choice if the prerequisites mentioned above will admit this.

9 If Packet Data in Overlaid subcell is used, select among these TCHGRPs the TCHGRPs in the preferred subcell according to the parameter SCALLOC.

10 Among these TCHGRPs, select the first found TCHGRP and allocate as many PDCHs as requested (or as many as possible and allowed according to the parameter ODPDCHLIMIT, if less).


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