6 Paging procedures

04.603GPPGeneral Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 1999TS

For a mobile station in packet idle mode, the network may use the paging procedures to initiate the establishment of an RR connection or to trigger a cell update from the mobile station prior to a downlink packet transfer. A number of mobile stations can be paged for either downlink packet transfer or RR connection establishment in the same paging message.

For a mobile station in packet transfer mode, the network may use the paging procedures to initiate the establishment of an RR connection. A number of mobile stations can be paged for RR connection establishment in the same paging message.

Paging procedures for RR connection establishment are described in sub-clause 6.1. Paging procedures for downlink packet transfer are described in sub-clause 6.2.

6.1 Paging procedure for RR connection establishment

The network may initiate the establishment of an RR connection by the paging procedure for RR connection establishment.

The network initiates the paging procedure for RR connection establishment by sending a paging request message on the appropriate paging subchannel on CCCH or PCCCH, addressing the mobile station and indicating RR connection establishment.

The paging subchannels on CCCH and PCCCH are specified in 3GPP TS 05.02 and 3GPP TS 03.13. The paging request message for RR connection establishment is sent on the PCCCH if the mobile station is GPRS attached, PCCCH is present in the cell and the network operates in network mode of operation I (see 3GPP TS 23.060). Otherwise, the paging request message is sent on CCCH.

The network may also page the mobile station for RR connection establishment by sending a paging request message on PACCH if the mobile station is in packet transfer mode.

A mobile station in packet transfer mode is not required to decode the paging subchannels, on neither CCCH nor PCCCH, in the following two cases:

– The mobile station is not capable to handle an RR connection and a TBF simultaneously (GPRS class B mode of operation), or

– The mobile station requires that the BSS co-ordinates the allocation of radio resources for an RR connection and a simultaneous TBF (GPRS class A mode of operation by means of DTM).

6.1.1 Paging initiation using paging subchannel on CCCH

The paging initiation procedure and the paging request messages used on CCCH are specified in 3GPP TS 04.18.

6.1.2 Paging initiation using paging subchannel on PCCCH

The network initiates the paging procedure by sending a PACKET paging request message on an appropriate paging subchannel on PCCCH, considering the DRX parameters valid for each targeted mobile station.

For each mobile station, that is paged for RR connection establishment, a channel needed field is included in the PACKET PAGING REQUEST message, see sub-clause 11.2.22. The channel needed field defines how the mobile stations shall use the establishment cause field in the CHANNEL REQUEST message, as specified in 3GPP TS 04.18.

6.1.3 Paging initiation using PACCH

Paging initiation using PACCH applies when sending a paging request message to a mobile station that is GPRS attached, when the mobile station is in packet transfer mode and the network is able to co-ordinate the paging request with the radio resources allocated for the mobile station on a PDCH. This kind of paging co-ordination shall be provided in network mode of operation I (see 3GPP TS 23.060). This kind of paging co-ordination may be provided also in network mode of operation II or III. This kind of paging co-ordination shall be provided if the network supports DTM. The provision of paging co-ordination in network mode of operation II and III shall be indicated on BCCH or PBCCH. If such indication is received, a mobile station in packet transfer mode shall expect the paging messages to be received on the PACCH.

The network shall send the PACKET PAGING REQUEST message to the mobile station on the appropriate PACCH. The message includes the mobile station identification and the channel needed field which defines how the mobile station shall use the establishment cause field in the CHANNEL REQUEST message, as specified in 3GPP TS 04.18.

6.1.4 Paging response

Upon receipt of a Paging Request or Packet Paging Request message, for the purpose of triggering an RR connection establishment, a mobile station operating in GPRS class B mode of operation and in packet transfer mode shall either ignore or respond to the paging request according to 3GPP TS 22.060.

When the mobile station responds to a paging request for RR connection establishment, it shall follow the paging response procedures as specified in 3GPP TS 04.18. For that purpose, a mobile station in packet transfer mode or a mobile station that has initiated a packet access procedure may abort any ongoing TBF or the packet access procedure in the following two cases:

– The mobile station is not capable to handle an RR connection and a TBF simultaneously (GPRS class B mode of operation), or

– The mobile station requires that the BSS co-ordinates the allocation of radio resources for an RR connection and a simultaneous TBF (GPRS class A mode of operation by means of DTM).

6.2 Paging procedure for downlink packet transfer

The network may initiate the paging procedure for downlink packet transfer in order to obtain the mobile station cell location required for the downlink packet transfer. The procedure is triggered by a page request from the GMM sublayer on the network side, see 3GPP TS 24.007 and 3GPP TS 24.008. The procedure is initiated by sending a paging request message on the appropriate paging subchannel on CCCH or PCCCH. The paging subchannels on CCCH and PCCCH are specified in 3GPP TS 05.02 and 3GPP TS 03.13.

The paging request message is sent on PCCCH, if PCCCH is present in the cell. Otherwise, the paging request message is sent on CCCH.

A mobile station that indicates DTM support to the network is not required to decode the paging subchannels, on neither CCCH nor PCCCH, while it is in dedicated mode. If the cell location for a mobile station that has indicated DTM support is required while the mobile station is in dedicated mode, the network may use the packet notification procedure defined in 3GPP TS 04.18.

6.2.1 Paging procedure using paging subchannel on CCCH

The packet paging procedure and the paging request messages used on CCCH are specified in 3GPP TS 04.18.

6.2.2 Paging using paging subchannel on PCCCH

The network initiates the paging procedure by sending a PACKET paging request message on an appropriate paging subchannel on PPCH, considering the DRX parameters valid for each targeted mobile station.

6.2.3 Paging response

On receipt of a PACKET paging request message, the RR sublayer of addressed mobile station indicates the receipt the paging request to the GMM sublayer (see 3GPP TS 24.007 and 3GPP TS 24.008).

NOTE: The mobile station performs a pageresponse by sending an LLC PDU to the network as defined in 3GPP TS 24.008 and 3GPP TS 04.64. The transfer of an LLC PDU may serve as a cell update.