11.2.10 Packet Paging Request

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

This message is sent on the PCCCH by the network to trigger channel access by up to four mobile stations, for either TBF or RR connection establishment. It may also be sent on PACCH to a mobile station in packet transfer mode to indicate page request for RR connection establishment. The mobile stations are identified by either IMSI, TMSI or P-TMSI. Depending on the method used to identify the mobile station, 1 – 4 mobile stations can be addressed in the message. Special requirements for the transmission of this message on PACCH applies, see 3GPP TS 05.02.

Message type: PACKET PAGING REQUEST MESSAGE

Direction: network to mobile station

Classification: distribution message

Table 11.2.10.1: PACKET PAGING REQUEST message content

< Packet Paging Request message content > ::=

< PAGE_MODE : bit (2) >

{ 0 | 1 < PERSISTENCE_LEVEL : bit (4) >* 4}

{ 0 | 1 < NLN : bit (2) > }

{ { 1 < Repeated Page info : < Repeated Page info struct > > } ** 0

< padding bits > } // — truncation at end of message allowed, bits ‘0’ assumed

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

< Repeated Page info struct > ::=

{ 0 — Page request for TBF establishment

{ 0 < PTMSI : bit (32) >

| 1 < Length of Mobile Identity contents : bit (4) >

< Mobile Identity : octet (val (Length of Mobile Identity contents)) > }

| 1 — Page request for RR conn. establishment

{ 0 < TMSI : bit (32) >

| 1 < Length of Mobile Identity contents : bit (4) >

< Mobile Identity : octet (val (Length of Mobile Identity contents)) > }

< CHANNEL_NEEDED : bit (2) >

{ 0 | 1 < eMLPP_PRIORITY : bit (3) > } }

! < Ignore : bit (*) = <no string> > ;

Table 11.2.10.2: PACKET PAGING REQUEST information element details

PAGE_MODE (2 bit field)
This field is defined in sub-clause 12.20.

PERSISTENCE_LEVEL (4 bit field for each Radio Priority 1…4)
This field is defined in sub-clause 12.14, PRACH Control Parameters.

NLN (2 bit field)
Notification List Number – This field may only be present if the message contains at least one page request for an RR connection establishment. The field is coded as defined in the P1 Rest Octets information element in 3GPP TS 04.08.

Repeated Page info struct
The Repeated Page info struct is repeated as many times as required to fulfil the number of wanted paged mobiles. If the Paging Request Message is used with only P-TMSIs or TMSIs, the field can be repeated up to four times within one message. If the Paging Request Message is used with only IMSIs, the field can be repeated up to two times within one message.

The first bit in the Repeated Page info field indicates if this is a page request for TBF connection establishment or for RR connection establishment.

A page request for TBF connection establishment can either be addressed with P-TMSI or IMSI.

A page request for RR connection establishment contains a Channel Needed and optionally a Priority parameter and can either be addressed with TMSI or IMSI.

PTMSI (32 bit field)
The Packet Temporary Mobile Station Identity (PTMSI) is defined in 3GPP TS 03.03. This field is encoded as a binary number.
Range 0 to 4294967295

Mobile Identity (variable length octet string)
This octet string is the representation of the Mobile Identity. It shall provide the international mobile subscriber identity, IMSI. The encoding of this octet string is the value part (starting with octet 3) of the type 4 information element Mobile Identity defined in 3GPP TS 04.08.

Any value other than IMSI for the type of identity in this octet string is spare. Such mobile identity shall be disregarded by the receiver but any further occurrence of the Repeated Page Info struct in the message shall be analysed.

TMSI (32 bit field)
TMSI is a unique Temporary Mobile Subscriber Identity. TMSI is associated with the mobile subscriber and defined in 3GPP TS 03.03. This field is coded as a binary number.
Range 0 to 4294967295

CHANNEL_NEEDED (2 bit field)
The channel needed field indicates which type of channel is needed for the mobile station for the transaction linked to the paging procedure. The field is coded according to following table:

bit
2 1
0 0 Any channel
0 1 SDCCH
1 0 TCH/F (Full rate)
1 1 TCH/H or TCH/F (Dual rate)

eMLPP_PRIORITY (3 bit field)
The optional eMLPP_PRIORITY field relates to Mobile Station Identity i(i = 1,2,3,4) and may only be present when the page relates to a paging request to trigger RR connection establishment. The eMLPP_PRIORITY field is coded as the Priority field defined in the P1 Rest Octets information element in 3GPP TS 04.08.