GSM_USEFUL_Z1.docx

04.089.1.22Paging request type 1This message is sent on the CCCH by the network to up to two mobile stations. It may be sent to a mobile station in idle mode to trigger channel access. It may be sent to a mobile station in packet idle mode to transfer MM information (i.e. trigger of cell update procedure). The mobile stations are identified by their TMSI/P-TMSI or IMSI. See table9.22/GSM04.08.The L2 pseudo length of this message is the sum of lengths of all information elements present in the message except the P1 Rest Octets and L2 Pseudo Length information elements.Message type:PAGING REQUEST TYPE 1Significance:dualDirection:network to mobile stationTable 9.22/GSM04.08: PAGING REQUEST TYPE 1 message contentIEIInformation elementType / ReferencePresenceFormatlengthL2 Pseudo LengthL2 Pseudo LengthMV 110.5.2.19RR managementProtocol DiscriminatorMV1/2Protocol Discriminator10.2Skip IndicatorSkip IndicatorMV1/210.3.1Paging Request Type 1Message TypeMV1Message Type10.4Page ModePage ModeMV1/210.5.2.26Channels Needed forChannel NeededMV1/2Mobiles 1 and 210.5.2.8Mobile Identity 1Mobile IdentityMLV2-910.5.1.417Mobile Identity 2Mobile IdentityOTLV 3-1010.5.1.4P1 Rest OctetsP1 Rest OctetsMV0-1710.5.2.239.1.22.1Unnecessary IEA mobile station in idle mode shall consider all information elements as unnecessary IEs except for the Page Mode IE.9.1.22.2Channels needed for Mobiles 1 and 2The first CHANNEL field of Channel Needed IE is associated with Mobile Identity 1. The second CHANNEL field of Channel Needed IE is associated with Mobile Identity 2.If this message is used in the packet paging procedure, the Channel Needed IE associated with the corresponding Mobile Identity 1 or 2 shall be coded with the value 00 (any channel) by the network. The mobile station receiving a packet paging request shall treat this information element as unnecessary in the message.9.1.22.3Mobile IdentitiesThe Mobile Identity 1 and 2 IEs shall not refer to IMEI.9.1.22.4P1 Rest OctetsThe sum of the length of this IE and the L2 Pseudo Length of the message equals 22.This IE may contain a notification list number field and/or, referring to each one of the Mobile Identity 1 and 2 IEs, a Priority1 and 2 field and/or a Packet Page Indication1 and 2 field.10.5.2.26Page ModeThe purpose of the Page Mode information element is to control the action of the mobile station belonging to the paging subgroup corresponding to the paging subchannel.The Page Mode information element is coded as shown in figure10.5.56/GSM04.08 and table10.5.64/GSM04.08.The Page Mode is a type 1 information element. 8 7 6 5 4 3 2 1+-+ 0 0 octet 1 Page Mode IEI sparespare PM +-+Figure 10.5.56/GSM04.08: Page Mode information elementTable 10.5.64/GSM04.08: Page Mode information element+-+ PM (octet 1) Bits 2 1 0 0 Normal paging. 0 1 Extended paging. 1 0 Paging reorganization. 1 1 Same as before. Note: The value same as before has been defined instead of reserved to allow the use of this coding with another meaning in an upwards compatible way in later phases of the GSMsystem. +-+10.5.2.8Channel NeededThe purpose of the Channel Needed information element is to indicate to up to two mobile stations which type of channel is needed (for each mobile station) for the transaction linked to the paging procedure.The Channel Needed information element is coded as shown in figure10.5.29/GSM04.08 and table10.5.29/GSM04.08.The Channel Needed is a type 1 information element. 8 7 6 5 4 3 2 1 +-+ Channel Needed CHANNEL CHANNEL octet 1 IEI (second) (first) +-+Figure 10.5.29/GSM 04.08: Channel Needed information elementTable 10.5.29/GSM04.08: Channel Needed information element+-+ CHANNEL (octet 1) Bits 2/4 1/3 0 0 Any channel. 0 1 SDCCH. 1 0 TCH/F (Full rate). 1 1 TCH/H or TCH/F (Dual rate). If this information element is used for only one mobile station, then the first CHANNEL field is used and the second CHANNEL field is spare. +-+10.5.1.4Mobile IdentityThe purpose of the Mobile Identity information element is to provide either the international mobile subscriber identity, IMSI, the temporary mobile subscriber identity, TMSI/P-TMSI, the international mobile equipment identity, IMEI or the international mobile equipment identity together with the software version number, IMEISV.The IMSI shall not exceed 15 digits, the TMSI/P-TMSI is 4 octets long, and the IMEI is composed of 15 digits, the IMEISV is 16 digits (see GSM03.03).For packet paging the network shall select the mobile identity type with the following priority:1- P-TMSI: The P-TMSI shall be used if it is available.2- IMSI: The IMSI shall be used in cases where no P-TMSI is available.For all other transactions except emergency call establishment, emergency call re-establishment, mobile terminated call establishment, the identification procedure, the GMM identification procedure, the GMM authentication and ciphering procedure and the ciphering mode setting procedure, the mobile station and the network shall select the mobile identity type with the following priority:1- TMSI: The TMSI shall be used if it is available.2- IMSI: The IMSI shall be used in cases where no TMSI is available.For mobile terminated call establishment the mobile station shall select the same mobile identity type as received from the network in the PAGING REQUEST message.For emergency call establishment and re-establishment the mobile station shall select the mobile identity type with the following priority:1- TMSI: The TMSI shall be used if it is available.2- IMSI: The IMSI shall be used in cases where no TMSI is available.3- IMEI: The IMEI shall be used in cases where no SIM is available or the SIM is considered as not valid by the mobile station or no IMSI or TMSI is available.In the identification procedure and in the GMM identification procedure the mobile station shall select the mobile identity type which was requested by the network.In the ciphering mode setting procedure and in the GMM authentication and ciphering procedure the mobile shall select the IMEISV.The Mobile Identity information element is coded as shown in figure 10.5.4/GSM04.08 and table10.5.4/GSM04.08.The Mobile Identity is a type 4 information element with a minimum length of 3 octet and 11 octets length maximal. Further restriction on the length may be applied, e.g. number plans. 8 7 6 5 4 3 2 1+-+ Mobile Identity IEI octet 1+- Length of mobile identity contents octet 2+- odd/ Identity digit 1 even Type of identity octet 3 indic +-+- Identity digit p+1 Identity digit p octet 4*+-+Figure 10.5.4/GSM04.08: Mobile Identity information elementTable 10.5.4/GSM04.08: Mobile Identity information element+-+ Type of identity (octet 3) Bits 3 2 1 0 0 1 IMSI 0 1 0 IMEI 0 1 1 IMEISV 1 0 0 TMSI/P-TMSI 0 0 0 No Identity note 1) All other values are reserved. Odd/even indication (octet 3) Bit 4 0 even number of identity digits and also when the TMSI/P-TMSI is used 1 odd number of identity digits Identity digits (octet 3 etc) For the IMSI, IMEI and IMEISV this field is coded using BCD coding. If the number of identity digits is even then bits 5 to 8 of the last octet shall be filled with an end mark coded as 1111. If the mobile identity is the TMSI/P-TMSI then bits 5 to 8 of octet 3 are coded as 1111 and bit 8 of octet 4 is the most significant bit and bit 1 of the last octet the least significant bit. The coding of the TMSI/P-TMSI is left open for each administration. +-+NOTE 1:This can be used in the case when a fill paging message without any valid identity has to be sent on the paging subchannel.9.1.25Paging responseThis message is sent on the main DCCH by the mobile station to the network in connection with establishment of the main signalling link as a response to the paging request message. See table9.25/GSM04.08.Message type:PAGING RESPONSESignificance:dualDirection:mobile station to networkTable 9.25/GSM04.08: PAGING RESPONSE message contentIEIInformation elementType / ReferencePresenceFormatlengthRR managementProtocol DiscriminatorMV1/2Protocol Discriminator10.2Skip IndicatorSkip IndicatorMV1/210.3.1Paging ResponseMessage TypeMV1Message Type10.4Ciphering Key SequenceCiphering Key SequenceMV1/2NumberNumber10.5.1.2Spare Half OctetSpare Half OctetMV1/210.5.1.8Mobile StationMobile StationMLV4Classmark Classmark 210.5.1.6Mobile IdentityMobile IdentityMLV2-910.5.1.49.2.2Authentication requestThis message is sent by the network to the mobile station to initiate authentication of the mobile station identity. See table9.2.3/GSM04.08.Message type:AUTHENTICATION REQUESTSignificance:dualDirection:network to mobile stationTable 9.2.3/GSM04.08: AUTHENTICATION REQUEST message contentIEIInformation elementTyp