11.2.55 EC Packet Power Control/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

This message is sent on EC-PACCH by the network to the mobile station in order to update the mobile station timing advance or power control parameters.

Message type: EC PACKET POWER CONTROL/TIMING ADVANCE

Direction: network to mobile station

Classification: non-distribution message

Table 11.2.55.1: EC Packet POwer CONTROL/TIMING ADVANCE information elements

< EC Packet Power Control/Timing Advance message content > ::=

< USED_DL_COVERAGE_CLASS : < Used DL Coverage Class IE >>

{ < Global TFI : < Global TFI IE > >

{ { 0 | 1 < T_AVG_T : bit (5) > }

{ 0 | 1 < EC Packet Timing Advance : < EC Packet Timing Advance IE >> }

{ 0 | 1 < GAMMA : bit (5) > }

< padding bits >

! < Non-distribution part error : bit (*) = < no string > > }

! < Address information part error : bit (*) = < no string > > }

! < Distribution part error : bit (*) = < no string > > ;

Table 11.2.55.2: EC Packet POwer CONTROL/TIMING ADVANCE information element details

USED_DL_COVERAGE_CLASS (2 bit field)
This information element is defined in sub-clause 12.71.

Global TFI IE
This information element contains the TFI of the mobile station’s downlink TBF or uplink TBF. This field is defined in sub-clause 12.10.

T_AVG_T (5 bit field)
The T_AVG_T parameter is a signal strength filter period for power control in packet transfer mode. 2(k/2) / 6 multiframes, k = 0, 1, 2, …, 25 (see 3GPP TS 45.008). Values greater than 25 shall be interpreted as 25 by the mobile station.

EC Packet Timing Advance
This information element is defined in sub-clause 12.74.

GAMMA (5 bit field)
This field is the binary representation of the parameter GCH for MS output power control in units of 2 dB, see 3GPP TS 45.008. The field is coded according to the following table:

bit
5 4 3 2 1
0 0 0 0 0 GCH = 0 dB
0 0 0 0 1 GCH = 2 dB
: : : :
1 1 1 1 0 GCH = 60 dB
1 1 1 1 1 GCH = 62 dB