8.6 PACKET CONTROL ACKNOWLEDGEMENT

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

An (EC) PACKET CONTROL ACKNOWLEDGEMENT message shall always be sent in the uplink resources specified by the corresponding valid RRBP field of a downlink RLC/MAC control block, and not in any other uplink resource that may be allocated to the mobile station. However the transmission of the (EC) PACKET CONTROL ACKNOWLEDGEMENT message takes precedence over the transmission of allocated uplink radio blocks or the reception of PCCCH or assigned (EC-)PDTCH radio blocks. If transmission of the PACKET CONTROL ACKNOWLEDGEMENT message would result in more than the maximum Tx timeslots per TDMA frame allowed by the multislot class, transmission of the highest numbered PDCH(s) shall be omitted.

In dual transfer mode the reception and transmission of assigned TCH radio blocks on dedicated resources takes precedence over the transmission of the PACKET CONTROL ACKNOWLEDGEMENT.

A mobile station in packet transfer mode in a Downlink Dual Carrier configuration or a DLMC configuration shall respond in the uplink radio block indicated by the RRBP field on the same radio frequency channel as the one where the poll was received. A mobile station in dual transfer mode in a Downlink Dual Carrier configuration shall respond in the uplink radio block on the timeslot or the PDCH pair indicated by the RRBP field (see sub-clause 10.4.5) on the uplink radio frequency channel where the dedicated resource is assigned regardless of which downlink radio frequency channel the poll was received on, unless this would prevent the transmission or reception of a TCH radio block on a dedicated resource.