DOC

S1-99265_N2-99277-PrePaging-Feasibility-Report.doc - x

By Carmen Murray,2014-05-17 11:36
8 views 0
The schedule for this Work Item is that the completed Pre-paging Feasibility Report will be presented for approval at the Edinburgh meeting of TSG CN WG2 in

TSG-SA Working Group 1 (Services) meeting #3 TSGS1#3(99)265 th-12thHampton Court, London, 10 May 1999 AGENDA:6.1.3

3GPP TSG-CN WG2 Tdoc 3GPP N2-99 277

    ETSI STC SMG3 Working Party ‘C’

    Issy les Moulineaux, FRANCE ndth22 -26 March 1999

Title: Liaison Statement on the Pre-paging Feasibility Report

To: TSG SA WG2

Copied to: TSG SA WG1, TSG CN WG1

From: NEC Technologies (UK), Fujitsu Telecom Europe (UK)

TSG CN WG2 would like to inform TSG SA WG2 that TSG CN WG2 is currently studying Pre-

    paging Work Item i.e. the application of pre-paging to the UMTS CN. A copy of the first draft of the

    Pre-paging Feasibility Report is attached to this LS.

The schedule for this Work Item is that the completed Pre-paging Feasibility Report will be presented

    for approval at the Edinburgh meeting of TSG CN WG2 in May and at the TSG CN meeting in June.

3GPP TSG-CN WG2 Tdoc 3GPP N2-99 176

    ETSI STC SMG3 Working Party ‘C’ Tdoc SMG3 3C99-476

    Issy les Moulineaux, FRANCE ndth -26 March 1999 22

Title: Draft Technical Report: Pre-paging in the UMTS CN

Source: NEC Technologies (UK), NTC (Nippon Telecommunications Consulting)

Agenda Item: 6.6

This is the first draft of the technical report on Pre-paging in the UMTS CN.

1. Intellectual Property Rights

    2. Foreword

    3. Introduction

    In a GSM mobile terminated call, the called mobile station is not paged until after the SRI/PRN procedure is completed. This results in a call path being set up through the GSM network between the GMSC and the VMSC before the mobile station has been paged. In some circumstances this call path may turn out to have been unnecessary if the mobile station does not accept the call (e.g. because the mobile was out of coverage). This represents an inefficient use of network resources.

    Pre-paging has been proposed as a means of using network resources in a more efficient manner. In this context, Pre-paging in GSM/UMTS networks refers to the case where the called mobile is paged during the SRI/PRN procedure, i.e. before the MSC/VLR returns the PRN to the GMSC.

    Also, this report will study whether Pre-paging is a suitable mechanism to improve the accuracy of location and status information for CAMEL. If so, this could lead to improved services for CAMEL subscribers.

4. Scope

The purpose of this ETR is to study:

    1) The potential applications of Pre-paging in GSM/UMTS networks 2) The impact of Pre-paging on the GSM/UMTS specifications. 3) The interaction of Pre-paging with the work carried out by SMG2 and SMG3 on Classmarks for

    UMTS (i.e. Service Classmark and Terminal classmark).

5. References

6. Definitions and Abbreviations

7. Applications of Pre-paging

The potential applications of Pre-paging in UMTS are as follows:

1. Basic Pre-paging (i.e. the more efficient use of network resources when mobile terminated calls

    do not complete)

    2. Signalling of terminal capabilities to the GMSC in Mobile Terminated calls 3. Signalling of current radio environment related capabilities (i.e. GSM, UTRAN coverage area)

    to the GMSC.

    4. Support of active location information retrieval for the CAMEL Any Time Interrogation (ATI)

    service

    5. Extension of the scope of Early Call Forwarding on: - not reachable (mobile not responding) - subscriber busy

    - radio congestion

7.1 Basic Pre-paging

Pre-paging in GSM/UMTS networks refers to the case where the called mobile is

    paged during the SRI/PRN procedure, i.e. the MSC/VLR returns the PRN to the

    GMSC after the mobile has responded to the paging message. This is illustrated by the

    following diagram:

    MSMSC/VLRHLRGMSC

    Initial Address Message

    Provide roaming

    Send Routing

    (IAM)

    Paging

    number

    Paging

     Information

    before call

    set up to

    PRN Response

    Page response

    MSC/VLR

    (MSRN)

    SRI Response

    (MSRN)

     IAM

    Figure ing in the GSM/UMTS network1 Basic Pre-pag

The Pre-paging procedure will need to have the capability to control

    - When the radio connection in the access network is to be released. - Define the value of a supervision timer to manage the allocated radio bearer - Control whether other normal MM/RR procedures (authentication, ciphering) can continue in

    parallel with incoming call setup after the initial Page Response is received from the MS. This

    will allow faster incoming call set-ups as access procedures in VMSC are executed in parallel

    with the core network procedures in GMSC.

The above control information will need to be transferred in the forward direction to the MSC/VLR.

    Thus the SRI and PRN messages will need to carry additional parameters.

The actual contents of the control parameters sent to the MSC/VLR are for further study.

7.2 Signalling of terminal capabilities to the GMSC/GGSN in Mobile

    Terminated Transactions

The ability to contact the MS for Pre-paging offers opportunities to obtain additional information from

    the MS in real-time very efficiently as part of generic Pre-paging procedures. This is an example of

    an enhanced service to CAMEL subscribers. Existing messages will be used where ever possible to

    “piggy-back” the additional information. The early sending of the MS terminal capabilities will be developed. This will enable decisions to be made in the core network at the earliest opportunity based

    on the actual status of the MS.

The Pre-paging procedures are likely to be part of the MM procedures (GSM 04.08) which are

    normally performed in response to Paging from the core network. This will be a one way flow of

    information of the MS terminal capabilities from the MS towards the core network.

The MS terminal capability information received in the core network (3G MSC/ 3G SGSN) will be

    transported transparently to the interrogating node in the core network (3G HLR and subsequently 3G

    GMSC / 3G GGSN) as part of the existing MAP procedures (GSM 09.02, GSM 03.18)

Thus the MS Terminal Capabilities will be transported to the core network in the following messages:

    - Page Response (DTAP signalling)

    - PRN Response (MAP signalling)

    - SRI Response (MAP signalling)

    - Also PSI Response (MAP), ATI Response (MAP) and Intitial DP (CAP) will be affected.

The actual contents of the MS Terminal Capabilities fields are for further study. Its relationship to

    the similar features in GSM will need to be considered e.g. MS Classmark, MExE Classmark etc.

The interaction with GSM Location Services (LCS) will need to be considered. It may be possible to

    also return the information of the actual location of the MS as part of the generic Pre-paging

    procedures.

7.3 Signalling of current radio environment related capabilities (i.e.

    GSM, UTRAN coverage area) to the GMSC/GGSN.

The ability to contact the MS for Pre-paging offers opportunities to obtain additional information from

    the serving BSS / RNS in real-time very efficiently as part of general Pre-paging procedures. This is

    an example of an enhanced service to CAMEL subscribers. Existing messages will be used where ever possible to “piggy-back” the additional information. The early sending of the RNS capabilities

    will be developed. This will enable decisions to be made in the core network at the earliest opportunity based on the actual status of the serving RNS.

    This feature will enable the core network to determine the capability of the access network serving the MS i.e. whether GSM or UMTS coverage serves the MS. This real time information may be useful in the core network when there are functional differences in the access network (for example the location of the Transcoder).

    These procedures are likely to be part of the BSSMAP/ RANAP procedures (GSM 08.08) which are normally performed in response to Paging from the core network. This will be a one way flow of information of the serving RNS capabilities from the RNC towards the core network.

    The RNS capability information received in the core network (3G MSC/ 3G SGSN) will be transported transparently to the interrogating node in the core network (3G HLR and subsequently 3G GMSC / 3G GGSN) as part of the existing MAP procedures (GSM 09.02, GSM 03.18)

    Thus the RNS Capabilities will be transported to the core network in the following messages: - Complete Layer 3 message [Page Response] (BSSMAP/RANAP signalling) - PRN Response (MAP signalling) - SRI Response (MAP signalling) - Also PSI Response (MAP), ATI Response (MAP) and Intitial DP (CAP) will be affected.

    The actual contents of the RNS Capabilities field are for further study. Its relationship to the similar features in GSM will need to be considered e.g. MS Classmark, Network Node Capability (e.g. MSC

    capability) etc.

    The interaction with GSM Location Services (LCS) will need to be considered. It may be possible to also return the information of the actual location of the MS as part of the generic Pre-paging procedures.

    7.4 Support of active location information retrieval for the CAMEL

    Any Time Interrogation (ATI) service

[Editor’s note: this application will be described in detail within this sub-section.]

This is an example of an enhanced service to CAMEL subscribers.

7.5 Extension of the scope of Early Call Forwarding

    The scope of Early Call Forwarding could be extended by Pre-paging to include Early Call Forwarding on:

    - not reachable (mobile not responding) - subscriber busy

    - radio congestion

    This is an example of an enhanced service to CAMEL subscribers.

8. Interaction of Pre-paging with Existing Services

8.1 Interaction with OR-LCF

[Editor’s note: The impact of Pre-Paging on the Optimal Routing for Late Call Forwarding service

    needs further study. It is possible that Pre-Paging may make some cases of OR-LCF redundant. But

    Pre-Paging will not replace OR-LCF for (CFNRy) Call Forwarding on No Reply.]

The Pre-paging procedure has some similarities with the OR-LCF procedures. However there are

    some significant differences between the two, i.e.:

    - Pre-paging does not make use of the MAP message Resume Call Handling

    - In Pre-paging the call is forwarded without routing to the visited network.

8.2 Interaction With Location Services

9. Compatibility of Pre-paging with GSM Release 98

    Specifications

[Editor’s note: This will study the compatibility of Pre-paging with GSM specifications.]

The existing GSM specifications are likely to be impacted by Pre-paging work item. Enhancements to

    the following specifications may be necessary:

    - GSM 03.18

    - GSM 03.78

    - GSM 04.08

    - GSM 08.08

    - GSM 09.02

9.1 Basic Pre-paging

    GSM 09.02 specifies the PRN timer within the HLR to have a value of 15-30 seconds. It is for further

    study whether this timer is suitable for Pre-paged calls.

10. Impact of Pre-paging on GSM Release 99

    Specifications

[Editor’s note: Describes the detailed changes required in GSM Release 99 to implement basic Pre-

    paging]

    11. Conclusions

Report this document

For any questions or suggestions please email
cust-service@docsford.com