12.29 COMPACT reduced MA

3GPP44.060General Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 17TS

Table 12.29.1: COMPACT reduced MA information element

< COMPACT reduced MA IE > ::=

<Length of Reduced MA bitmap : bit (7) >

<Reduced MA bitmap : bit( val( Length of Reduced MA bitmap ) ) >

{ 0 | 1 <MAIO_2 : bit(6) >};

Table 12.29.2: COMPACT reduced MA information element details

Length of Reduced MA bitmap (7 bit field)
This field is the binary representation of the length (in bits) of the field Reduced MA bitmap.
If set to 0, then no reduced Mobile Allocation is used.
Range 0 to 127.

Reduced MA bitmap (bitmap)
This field gives the reduced Mobile Allocation.
This bitmap uses the list of frequencies given in the current Mobile Allocation, i.e. the Mobile Allocation used by the mobile for the assigned TBF. These radio frequency channels shall be arranged in the order of ascending ARFCN, except for ARFCN = 0, if included, which shall be put last.

The first bit position in the reduced MA bitmap corresponds to the last ARFCN put in the list, the last bit position corresponds to the first ARFCN put in the list. Each bit position is coded:

0 the corresponding radio frequency channel does not belong to the reduced MA;
1 the corresponding radio frequency channel belongs to the reduced MA.

MAIO_2 (6 bit field)
This field is present when a reduced MA is used, indicating more than one frequency.
This parameter is the binary representation of the mobile allocation index offset (MAIO) to be used on blocks using a reduced Mobile Allocation.
Range 0 to 63.