12.12b Packet Extended 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 Packet Extended Timing Advance field is a 2 bit field used to support Extended Timing Advance. These two bits represent the two most significant bits of the timing advance value to be applied by the mobile station. The coding of the timing advance value is defined in the Timing Advance IE defined in 3GPP TS 44.018. The mapping of the two bits of the Packet Extended Timing Advance field is defined as follows:

Bit
1 bit 7 of the Timing Advance IE defined in 3GPP TS 44.018
2 bit 8 of the Timing Advance IE defined in 3GPP TS 44.018

The least significant bits of a timing advance value is provided the TIMING_ADVANCE_VALUE field in either a Packet Timing Advance IE (sub-clause 12.12) or a Global Packet Timing Advance IE (sub-clause 12.12a). If the least significant bits of the timing advance value is not provided in the message, then the Packet Extended Timing Advance field shall be ignored.