12.12a Global Packet Timing Advance

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

The Global Packet Timing Advance field describes the timing advance mode and timing advance value assigned to the mobile station for uplink and/or downlink TBF.

Table 12.12a.1: Global Packet Timing Advance information elements

< Global Packet Timing Advance IE > ::=

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

{ 0 | 1 < UPLINK_TIMING_ADVANCE_INDEX : bit (4) >

< UPLINK_TIMING_ADVANCE_TIMESLOT_NUMBER : bit (3) > }

{ 0 | 1 < DOWNLINK_TIMING_ADVANCE_INDEX : bit (4) >

< DOWNLINK_TIMING_ADVANCE_TIMESLOT_NUMBER : bit (3) > }

Table 12.12a.2: Global Packet Timing Advance information element details

TIMING_ADVANCE_VALUE (6 bit field)
If the TIMING_ADVANCE_VALUE field is present, the mobile station shall use the value contained therein after time defined in 3GPP TS 45.010. If the TIMING_ADVANCE_VALUE field is not present the mobile station shall not change its timing advance value. The Timing Advance value field is encoded the same as the Timing Advance value of the Timing Advance information element defined in 3GPP TS 44.018

UPLINK_TIMING_ADVANCE_INDEX (4 bit field)
This field indicates the Timing Advance Index related to Uplink TBF. This information field is encoded as a binary representation of the Timing Advance Index defined in 3GPP TS 45.002.
Range 0 to 15.

UPLINK_TIMING_ADVANCE_TIMESLOT_NUMBER (3 bit field)
This field indicates the timeslot assigned for the Continuous Timing Advance procedure on the PTCCH related to Uplink TBF. This field is coded as the binary representation of the timeslot number as defined in 3GPP TS 45.010.
Range 0 to 7

DOWNLINK_TIMING_ADVANCE_INDEX (4 bit field)
This field indicates the Timing Advance Index related to Downlink TBF. This information field is encoded as a binary representation of the Timing Advance Index defined in 3GPP TS 45.002.
Range 0 to 15.

DOWNLINK_TIMING_ADVANCE_TIMESLOT_NUMBER (3 bit field)
This field indicates the timeslot assigned for the Continuous Timing Advance procedure on the PTCCH related to Downlink TBF. This field is coded as the binary representation of the timeslot number as defined in 3GPP TS 45.010.
Range 0 to 7

If Timing Advance Index and Timing Advance Timeslot Number are present for any of the TBFs already existing or to be established with this message, the mobile station shall begin operation of the Continuous Timing Advance procedure at the point in time denoted by the TBF starting time if present, otherwise within the reaction time specified in 3GPP TS 45.010.

If Timing Advance Index and Timing Advance Timeslot Number are not present for any of the TBFs already existing or to be established with this message, the mobile station shall stop operation of the Continuous Timing Advance procedure.