GB2442514A - Uplink message reduction in mobile communications - Google Patents

Uplink message reduction in mobile communications Download PDF

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Publication number
GB2442514A
GB2442514A GB0619509A GB0619509A GB2442514A GB 2442514 A GB2442514 A GB 2442514A GB 0619509 A GB0619509 A GB 0619509A GB 0619509 A GB0619509 A GB 0619509A GB 2442514 A GB2442514 A GB 2442514A
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Prior art keywords
identity
network
message
initial uplink
uplink message
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GB0619509D0 (en
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Himke Van Der Velde
Gert-Jan Lieshout Van
Kyeongin Jeong
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic or resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/06Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/02Communication control; Communication processing
    • H04L29/06Communication control; Communication processing characterised by a protocol
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Application independent communication protocol aspects or techniques in packet data networks
    • H04L69/04Protocols for data compression
    • H04Q7/38
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access

Abstract

A method of reducing the size of an initial uplink message sent between a mobile terminal and a network element of a mobile communications network, wherein the size of an initial uplink message is reduced by omitting the public land mobile network and/or the tracking area identity in the message. In particular, if the cell (node B) broadcasts a single identity which is the same is that to be signalled by the UE then the UE sends a radio resource connection request message omitting the identity. If the cell broadcasts multiple identities one of which is the identity to be signaled by the UE, then the UE includes a pointer to the identity in the message. The invention allows faster transitions from the LTE-idle to LTE-active state in UTRAN networks.

Description

MOBILE COMMUNICATIONS

This invention applies to transitions between the LTE-Idle and LTE-Active state. More particularly, but not exclusively, this invention relates to reducing size of initial uplink message.

LTE focuses on a feature enhancement of the Universal Terrestrial Radio Access (UTRA) and an optimisation of the UTRAN (UTRA network) architecture.

The LTE objectives are, for example, a demand for higher data rates, a greater flexibility in frequency allocations and a continued cost reduction.

More details of the 3GPP work of the LTE may be found in [I] to [4].

Introduction

One of the requirements for LTE is to have a fast transition from the so-called LTE Idle to the so-called LTE_Active state, as indicated in the following extract from [1, clause 6.2.11: Sigi4flcantly reduced C-plane latency a) Transition Iine (excluding downlink paging delay and NAS signaling delay) of less than 100 msfrom a camped-state, such as Release 6 Idle Mode, to an active state such as Release 6 CELL_DCH, in such a way that the user plane is established.

Further details about the LTE_Idle and LTE_Active states are provided in [4, clause 5.5.2], see the following extract: Power-U p Perform R.alsbatlon In.1vItv -Allocate C-RNTI, TA-ID, UP uddr -R.I.ss. C-RNTI -Perform Authentication -Allocate DRX for PCH -Establish seourtty rsI.tlon

LTE IDLE LTE ACTIVE LTE DETACHED

RRC: RRC_IDLE RRC: RRC_CONNECTED RRC: NULL Context In network RRC Context In network: RRC Context in network: -Inctudes Information to enable fast -Indudes all Information necsssa,y for -Does not exist trend Von to LTEJACTIVE (e.g. communication security key Infoimatlon) Allocated UE-ld(s): Allocated UE-Id(a): Mocated UE-Id(s): -IMSI -IMSI -IMSI -ID unique in Trucking Ai* (TA-ID) -ID unique in Trucking Are. (TA-ID) -ID unique In cSli (C-RNTI) -1 or more UP addresses -I or more UP addresses UE position: UE position: UE position: -Known by network at Trucking Area -Known by network at oeIi lev.l -Not known by network (TA) level Mobility; Mobility Mobility: -Handover -PLMNIC.H selection -Csfl reselection DLJUL activity: DLJUL.ctlvtty DL activity: -UE may be configured with DRXIDTX -None -UE I. configured with DRX period periods New traffic Chanoe of PLMNlderualslratlon -Allocate C-RNT1 -Dealocats C-RNTI. TA-ID, IP address Timeout of osriodlc TA-uodts -Deallocate TA-ID, IP address E-UTRAN RRC protocol states For a UE in LTE_IdIe, the MME maintains a context. The eNB will however only maintain a context for UEs in LTE_Active.

Upon transition from LTE_Idle to LTE_Active the UE re-establishes the previous IP connectivity service. Although the details of the procedure have not been agreed, a high level description is provided in [3, clause 7.14.2], and illustrate in Fig. 1 (corresponding to Fig. 7.14-1 in [3]).

Fig. I illustrates that in order to reduce the delay of the transition, procedures that are performed sequentially in legacy systems are done in parallel in LTE/SAE: the AS-procedure for establishing a radio connection is combined with the NAS procedure for re-activating the previously established SAE bearers (referred to as NAS equivalent of Service Requests Accept').

One elements of the procedure that has not been agreed is the initial radio access procedure that is performed between the UE and the eNB.

A high level description of this procedure is shown in the Fig. 2.

At the start of the initial access procedure, the UB has no dedicated resources allocated, is has no short cell specific identity assigned and its uplink timing is not aligned with the network.

Hence, the initial message is using a contention based channel for asynchronous uplink transmissions. The information that can be transferred on such a channel is very limited i.e. 4-6 bits. Although the information that can be included in step 3 is larger, it is still quite limited for a UE at the cell edge. Some initial analysis shows that it should be possible to transfer around bits when using 2 HARQ re-transmission (1.25 MHz bandwidth, 1 ms Tn).

In order to reduce the delay, it would be desirable to avoid use of an additional uplink message to transfer the information to be included in the initial uplink message i.e. the message referred to as Radio Resource Connection Request' in Fig. 1. I.e. it would be desirable to limit the size of this message for most of the LTE_Idle to LTE_Active transitions to a value in the order of 100 bits. (

In case the transition is initiated due to of UL/ DL data to transfer i.e. the Service Request' case, it is assumed that the following information is to be included in the Radio Resource Connection Request' message: Information Need ENB MME Bits Comment Element/Group name ______ _____ _____ ______ ______________________________ RRC connection 2 CCCH message type request _____ _____ _____ _____ P-TMSI MP + + 32 Initial UE identity ____________ ____ ____ ____ ____ UMTS: 32b for P-TMSI TA code MP + + 16 Needed to have a globally unique initial UE identity UMTS: lBb for Location area code (LAC), 8b for Routing area ___________ ____ ____ ____ ____ code (RAC) PLMN identity MP + + 25 Needed to have a globally unique initial LiE identity and for muting purposes. Relevant in case of network sharing i.e. multiple PLMN identities.

UMTS: 25 bIt for PLMN identity (12b for MCCI 8 or 12b for MNCI ____________ ____ ____ ____ ____ 1 bit for MNC size) MME identity MP + + 0 Needed for routing purposes Assumed to be covered by the P..

______________ _____ ____ _____ _____ TMSI, similar to the NRI in UMTS Initial MP + -6 CQI of the current call measurement uifo ____ ____ ____ ____ ______________________ Initial UE AS MP + -12 Only the most essential capabilities capabilities, required for connection establishment May not be needed in case the MME stores this information for idle mode UEs, assuming none of these capabilities may change ______________ _____ ____ _____ _____ while in idle Establishment MP + + 5 The use of this IE is FFS, cause depending on the scenarios to be ______________ _____ ____ _____ _____ covered Service request 2 Short message type assumed i.e. this integrated message can only include limited number of NAS _______________ _____ _____ _____ _____ messages LiE Identity MP -+ 0 Covered by information in the AS.

part of the message i.e. P-TMSI, TA identity, PLMN identity Information Need ENB MME Bits Comment Element/Group name _____ ____ _____ _____ ___________________________ NAS Integrity MP -+ 36 For this initial uplink message.

check the NAS integrity is assumed to information also cover the AS-part of the message The indicated size includes a 4 bit message sequence nr as we have for UMTS today Service context MP -+ 16 Provides an overview of the UE's status active POP contexts. Used to re-synchronise mismatches between UE and MME/ UPE due to local release Needed If we assume to re- ______________ _____ _____ _____ activate all active contexts Service context NA C) An indication of which POP info context triggered the message.

Enables aGW to decide which lP connectivity service to re-activate Selective re-activation is ______________ _____ _____ _____ assumed not to a needed TOTALS ____ ____ 152 _______________________ In case the transition is initiated due a Tracking Area update' it is assumed that the following information is to be included in the Radio Resource Connection Request' message:

_____________________ _______ ______ ______ ______ _________________________________

Information Need ENB aGW Bits Comment Element/Group name _____ _____ _____ _____ ___________________________ RRC connection 2 CCCH message type request ____ ___ ____ ____ ___________________ P-TMSI MP + + 32 Initial UE identity ________________ _____ ____ _____ _____ UMTS: 32b for P-TMSI TA code MP + + 16 Needed to have a globally unique initial UE identity UMTS: 1Gb for Location area code (LAC), 8b for Routing _____________ ____ ____ ____ area code (RAC) PLMN identity MP + + 25 Needed to have a globally unique initial UE identity and for routing purposes. Relevant in case of network sharing i.e. multiple PLMN identities.

UMTS: 25 bit for PLMN identity (12b for MCC. 8 or 12b for ________________ _____ _____ _____ MNC, I bit for MNC size) ( Information Need ENB aGW Bits Comment Element/Group name _____ _____ _____ _____ ___________________________ MME identity MP + + 0 Needed for routing purposes Assumed to be covered by the P-TMSI, similar to the NRI in

_____________ ____ ____ ____ ____ UMTS

Initial measurement MP + -6 CQI of the current cell info ______ _____ _____ _____ _____________________________ Initial UE AS MP + -12 Only the most essential capabilities capabilities, required for connection establishment May not be needed in case the MME stores this information for idle mode UEs, assuming none of these capabilities may ________________ _____ ____ _____ _____ change while in idle Establishment MP + + 5 The use of this IE is FFS, cause depending on the scenarios to ________________ _____ ____ _____ _____ be covered TA updata 2 Short message type assumed i.e. this integrated message can only Wiclude limited number of ________________ _____ _____ _____ NAS messages Update type MP -_____ 4 As defined in 24.008 UE indentity MP 0 Covered by information In the AS-part of the message i.e. P. TMSI, TA identity, PLMN __________________ _____ _____ _____ identity NAS Integrity check MP 36 For this initial uplink message, information the NAS integrity is assumed to also cover the AS-part of the message The indicated size includes a 4 bit message sequence nr as we _______________ _____ ____ _____ have for UMTS today Service context MP 16 Provides an overview of the status UE's active PDP contexts. Used to re-synchronise mismatches between UE and MME/ UPE due to local release Needed if we assume to re- ________________ _____ ____ ____ ____ activate all active contexts Total 156 Similar to the Service Request _________________ _____ _____ _____ _____ case It has been suggested that it should be possible to reduce the size of the initial message by reducing the size of the integrity check info and by omitting the initial UE AS capabilities. This may reduce the size with something in the order of 30 bits. Although the result is close to the assumed limit of 100 bits, some further reduction is deemed to be necessary. (

According to one aspect of the present application, there is provided a method of reducing the size of an initial uplink message sent between a user terminal and a network element of a mobile communications message, wherein the size of an initial uplink message is reduced by omitting the public land mobile network and/or the tracking area identity in said message.

Preferably, the public land mobile network and/or the tracking area identity are omitted if a network element of the cell in which the UE sends the initial uplink message broadcasts a single public land mobile network identity and/or a single tracking area identity; and if the corresponding identity to be signalled by the UE in the initial uplink message is identical to the value that is broadcast in i), or the public land mobile network andior the tracking area identity are omitted if a network element of the cell in which the UE sends the initial uplink message broadcasts a plurality of public land mobile network identities and/or a plurality of tracking area identities; and if the corresponding identity to be signalled by the UE in the initial uplink message is identical to one of the values that is broadcast in i). Preferably, in the latter case a pointer to the identity of the serving cell.

According to another aspect of the present application, there is provided a mobile terminal for use in a mobile communications network arranged to reduce the size of an initial uplink message sent between a user terminal and a network element of a mobile communications message, wherein the size of an initial uplink message is reduced by omitting the public land mobile network and/or the tracking area identity in said message.

According to another aspect of the present application, there is provided a network element for a mobile communications network, arranged to receive an initial uplink message from a mobile terminal, wherein the size of said initial uplink message is reduced by omitting the public land mobile network and/or the tracking area identity in said message.

These and other aspects, preferred features and embodiments will be described further, by way of example only, with reference to the accompanying drawings in which: Fig. 1 is a schematic diagram of the information flow for paging and C-plane establishment extracted from [1]; Fig. 2 is a schematic diagram illustrating the initial access procedure between the UE and the eNB according to the prior art; and Fig. 3 is a schematic diagram illustrating the initial access procedure between the UP and the eNB according to one embodiment of the present invention.

The TA code and the PLMN identity contribute significantly to the message size, as already shown in the above table. The assumption is that in SAE/LTE, these identities will resemble the corresponding identities as used in legacy networks i.e. the Location Area Code and the PLMN identity as specified in [6, clauses 10.3.1.7 and 10.3.1.11] and as shown below in the following: 10.3.1.7 Location Area Identification Identifies uniquely a location area for a GSM-MAP type of PLMN. Setting specified in [5].

Information Need Multi Type and Semantics description Element/Group name _______ _______ reference ___________________ PLMN identity MP PLMN identity _________________ ________ ________ 10.3.1.11 ____________________ LAC MP Bit The first/leftmost bit of i string(16) the bit string contains I the most significant bit _____________ ______ 1. of the LAC..

10.3.1.11 PLMN identity This information element identifies a Public Land Mobile Network for a GSM-MAP type of PLMN. Setting of digits is defined in [11]. (

Information Need Multi Type and Semantics description Element/Group reference name _______ _______ _____________ ___________________ MCC MP 3 The first element contains the first MCC digit, the second element the second ________________ ______ ______ ____________ MCC digit and so on.

>MCC digit MP ______ INTEGER(O..9) __________________ MNC MP 2(03 The first element contains the first MNC digit, the iecond element the second ________________ _______ _______ ____________ MNC digit and 80 on.

>MNC digit MP ______ INTEGER(O..9) _________________ Further information about concerned identities This section briefly discusses the functionality associated with the S identities for which size optimization is proposed.

TA identity In order to resolve potential contentions during initial access, the UE needs to include a globally unique liE identity in the initial uplink message. Most of UEs in the LTE_Idle are assumed to have stored on the SIM a temporary identity that the network has previously assigned i.e. a P-TMSI'.

Since this temporary identity is unique within a TA, when using the P-TMSI', the UE will also have to identify the TA in which it was assigned. A globally unique TA identity comprises of a TA code, that uniquely identifying a TA within a PLMN, and a PLMN identity.

PLMN identity In case the UE applies a P-TMSI', the PLMN identity of the TA in which this temporary identity was assigned is needed to provide a globally unique UE identity.

In the case of network sharing, a cell may broadcast multiple PLMN identities out of which the liE selects one. In such a case, the liE will have to indicate the selected PLMN to enable the eNB to route the connection request to the appropriate CN node. ( l0

Broadcasting of concerned identities in UMTS In UMTS, the PLMN identifies are contained in the Master Information Block, as shown below (see [6, clauses 10.2.48.8.1 and 10.3. h7a1.

10.2.48.8.1 Master Information Block Information Need Multi Type and Semantics Version

Element/Group reference description

name _______ _______ ___________ ___________________ _______ Other information elements _______ _______ __________ ___________________ _______ MIB Value tag MP MIB Value tag _______________ ______ ______ 10.3.8.9 _________________ _______ CN information elements ______ _______ __________ __________________ _______ Supported PLMN MP PLMN types Type ______________ ______ ______ 10.3.1.12 ________________ ______ PLMN Identity CV-PLMN GSM Identity ______________ _____ ______ 10.3.1.11 ________________ ______ Multiple PLMN OP Multiple If present, this lE REL-6 List PLMN List specifies the PLMNs 10.3.1.7a of the cell. If absent, the IE UPLMN Identity specifies _____________ _____ ______ _________ the PLMN of the cell. ______ ANSI-41 information elements ______ _______ __________ __________________ _______ ANSI-41 Core CV-ANSI41 Network ANSI-Core Information 41 Network Information _______________ ______ ______ 10.3.9.1 _________________ _______ References to MP References other system to other information blocks system and scheduling information blocks blocks and scheduling blocks _______________ ______ ______ 10.3.8.14 _________________ _______ ( Condition Explanation GSM The IE is mandatory present If the IE Supported PLMN Types' is set to GSM-MAP' or GSM-MAP AND ANSI-41', and ______________________________ not needed otherwise ANSI-41 The IE is mandatory present if the IE Supported PLMN Types' is set to ANSI- 41' or GSM-MAP AND ANSI-41', and not _____________________________ needed otherwise I0.3.1.7a Multiple PLMN List This information element identifies the multiple Public Land Mobile Networks (for a GSM-MAP type of PLMN) of a cell in a shared network.

Information Need Multi Type and Semantics Version

Element/Group reference description

name _______ _______ _________ ___________________ _______ MIB PLMN MP Boolean The PLMN identity IE REL-6 IdentIty 10.3.1.11, broadcasted in the MIB, shall be included in the multiple PLMN list if and only if this lE is _____________ ______ _____ ________ TRUE. ______ Multiple PLMNs MP I to 5 _________ _________________ REL-6 >PLMN identity PLMN REL-6 with Optional identity MCC with Optional

MCC

______________ ______ ______ 10.3.1.1 Ia ________________ ______ In UMTS, a single Location Area Code (LAC) is signalled, even in case network sharing (i.e. multiple PLMN identities) is used. This LAC is contained in the System Information Block type 1, as shown below (see [6, clauses 10.2.48.8.4 and 10.3.1.9].

10.2.48.8.4 System Information Block tyDe 1 The system information block type I contains NAS system information as well as UE timers and counters to be used in idle mode and in connected mode.

L

Information Need Multi Type and Semantics

Element/Group reference description

name _____ _______________ _________ CN information elements _____ ________________ CN common MP NAS GSM-MAP NAS system system information information (GSM-MAP) ____ ______________ 10.3.1.9 ________________ CN domain MP 1 to Send CN information system <maxCNdomains> for each CN domain.

information list _____ _________________ __________ >CN domain MP CN system domain information system information _____ ______________ 10.3.1.2 _________________ UE information _____ _______________ UE Timers and MD UE Timers The UE behaviour is constants In idle and unspecified if this IE mode constants is absent.

in idle mode _______________ _____ _______________ 10.3.3.44 _________________ UE Timers and MD UE Tuners Default value means constants in and that for all timers and connected mode constants constants in -For parameters connected with need MD, the mode defaults specified in 10.3.3.43 10.3.3.43 apply and -For parameters wtth need OP, the parameters are _______________ _____-_______________ _________ absent 10.3.1.9 NAS system information (GSM-MAP) This information element contains system information that belongs to the non-access stratum for a GSM-MAP type of PLMN. This information is transparent to RRC. It may contain either information specific to one CN domain (CS or PS) or information common for both CN domains. )

information Need Multi Type and Semantics description Element/Group name _______ _______ reference __________________ GSM-MAP WAS MP Octet The first octet contains system information string(1..8 octet 1 [5) of the NAS ) system information element, the second octet contains octet 2 of the NM system information element and _______ ________ so on.

Size Reduction of the UE & PLMN identification within the initial uplink messae Fig. 3 illustrates the enhancement proposed in this application.

The figure illustrates the main benefit of the proposal, which is that due to the size reduction, it is possible to transfer a Radio Resource Connection Request message as first uplink L3 message' (i.e. in step 3 of the figure) including a combination of AS-and NAS-information as discussed in the previous.

In the following the different steps in the procedure are described in more detail. More specifically, the proposal affects step 3: i.e. the signalling is optimized by which the size of the concerned message is reduced Step 0) Before initiating the initial access procedure, the UE acquires the part of the system information that is broadcast in the cell the UE has selected, which includes one or, in case network sharing is used, more PLMN identities and NAS-system information which carries the TA code.

From the perspective of this application, it is assumed that SAE/ LTE will apply a similar organization as in UMTS e.g. as shown in the following. However, this is merely shown as an example i.e. the proposal is independent of the actual structure that is used. As an example, S/tE/ LTE may broadcast multiple TA codes.

Master Information Block'

I

Information Need Multi Type and Semantics description Element/Group name ________ _______ reference ___________________ CN information elements ______ ______ ______ _______________ PLMNLIs1 MP 1.. 6 _______ _______________ >PLMN Identity MP PLMN __________________ ________ ________ Identity _____________________ System Information Block type 1' Information Need Multi Type and Semantics description Element/Group name _______ _______ reference ___________________ CN information elements ________ ________ __________ ______________________ NAS system MP information ________ ________ _________ _____________________ >NAS system MP OCTET Including the TA code information ______ ______ STRING _________________ Step 1) The UE sends a Random Access Pre-amble' Step 2) Upon correctly detecting a Random Access Pre-amble', the eNB returns a Random Access Response' including e.g. Timing Advance, a scheduling grant (allowing the liE to transmit a first uplink message), cell specific temporary identifier (C-RNT1) Step 3) Upon receiving the Random Access Response', the UE sends the Radio Resource Connection Request message as first uplink L3 message' It is assumed that in most of the transitions from LTE Idle to LTE_Active, In case the PLMN identity and/ or the TA code to be included in the Radio Resource Connection Request message correspond with (one of the) corresponding identities that are broadcast in the cell (i.e. acquired by the liE in step 0), the UE does not include the full identity in the this message.

Instead, the UE either: If the cell in which the HE sends the Radio Resource Connection Request message broadcasts a single corresponding identity: o If the identity to be signalled is identical to the value that is broadcast (i.e. apply the broadcast value as the mandatory default value') * Omit the identity o Otherwise * Signal/ include the (full) identity If the cell in which the UE initiates the initial uplink message broadcasts multiple of the corresponding identities: o if the identity to be signalled is identical to one of the values that is broadcast Include an index i.e. a pointer to the matching identity o Otherwise * Signal/include the (full) identity A possible way to specify this is shown below (in the style of [6)): Radio Resource Connection Request' Information Need Multi Type and Semantics description Element/Group reference name ________ ________ ___________ _____________________

CHOICE PLMN MP

identity type ________ ________ ___________ ____________________ >Same as MIB entry MP Integer(1. .6) Indicates the applicable entry within the IE PLMN list that is included in the Master _________________ _______ _______ __________ Information Block' >Explicit PLMN PLMN In case the PLMN list identity identity that is included in the Master Information Block' does not include a matching entry, the full details of the PLMN _________________ _______ _______ __________ are signalled TA Code MD Bit The default value is the stiing(1 6) value included in the IE NAS system informatIon that is included in the System Information ________________ _______ _______ __________ Block type 1' Note A Mandatory Default (MD) value implies that no value is signalled in case the value to be indicated equals the default value The proposal may reduce the size of the initial message with 30- 34 bits (The size of the PLMN identity may be 20 bits, while the size of the TA code may be 16 bits).

Step 3*) The eNB forwards (relevant parts of) the Radio Resource Connection Request message to the MME. In case the Radio Resource Connection Request message includes an size optimized version of the PLMN identity and/ or the TA code, the eNB will have to convert these into a full version of the corresponding identity before forwarding them to the MM.E Step 4*) The MME returns a Radio Resource Connection Setup*' to the eNB Step 4) The eNB returns a Radio Resource Connection Setup' message to the

UE

I

Example

In order to clarify the proposal, an example is provided: The system information broadcast by the cell includes 4 PLMN identities and a single TA code i.e. as shown below.

Master Information Block' Information Need Multi Type and Semantics description Element/Group name ________ _______ reference ___________________ CN *,formation elements ________ ________ _________ PLMN List MP ______ _______ >PLMN Identity MP PLMN Identity _________________ _______ _______ P-A' ___________________ >PLMN Identity MP PLMN Identity >PLMN Identity MP PLMN Identity ________________ _______ _______ P-c. __________________ >PLMN Identity MP PLMN Identity System Information Block 1' Information Need Multi Type and Semantics description Element/Group name _______ _______ reference ___________________ CN information elements ________ ________ _________ NAS system MP InformatIon _________ _________ __________ >NAS system MP OCTET Including the TA code information ______ ______ STRING T-A' The PLMN identity the LIE shall indicate in the Radio Resource Connection Request message is equal to P-A' i.e. the same as the first entry of the list of PLMN identities included in the Master Information Block'.

Hence, the UE will set the select the Same as MIB entry' value of CHOICE PLMN identity type and set it to a value of 1' The TA code that the IJE shall indicate in the Radio Resource Connection Request message is equal to T-A' i.e. the same as the value of the TA code that is included in the System Information Block type 1'. Since this value is the default value, the UE need not signal the actual value.

pplicabi1itv ApDlicability of methods in SAEI LTE The methods covered by this application are applicable whenever the concerned identities are to be included in the initial uplink message, provided that the UE is required to update the contents of the message when it needs to re-transmit the message in another cell. The assumption is that the latter condition will apply, since this UE behaviour is also required in 1JMTS, see the following extract from [1, clause 8.1.3.5] below: 8.1.3.5 Cell re-selection, T300 or T318 timeout 1> if the UE has not yet received an RRC CONNECTION SETUP message with the value of the [B "Initial UE identity" equal to the value of the variable INITIAL_liE_IDENTiTY; and 1> if cell re-selection or expiry of timer T300 or timer T3 18 occurs:theUB shall: 1> check the value of V300; and 2> if V300 is equal to or smaller than N300: 3> if cell re-selection occurred: 4> set CFN in relation to SFN of current cell according to subclause 8.5.15.

3> set the lEs in the RRC CONNECTION REQUEST message according to subclause 8.1.3.3; 3> perform the mapping of the Access Class to an Access Service Class as specified in subclause 8.5.13; and p 3> apply the given Access Service Class when accessing the RACH; 3> submit a new RRC CONNECTION REQUEST message to lower layers for transmission on the uplink CCCH; 3> increment counter V300; 3> restart timer T300 when the MAC layer indicates success or failure to transmit the message.

According to [6, clause 8.5.1] a visiting1 roaming UE that has a P-TMSI' stored on the SIM will apply this as initial identity i.e. the roaming UE will not revert back to applying the IMSI. This is probably for reasons of identity confidentiality. For visiting UEs, the UE may not be able to route the connection request solely based on the Network Routing Information (NM, i.e. bits 14-23 of the TMS1).

Consequently, a UE roaming in to a shared network may have to indicate both the PLMN identity associated with the P-TMSI stored in the SIM and the PLMN identity corresponding with the selected PLMN. In such a scenario, the proposed optimization is applicable.

The optimization proposal is also applicable in case the IMSI is used as initial identity even though, due to the fact that the IMSI is larger than the P-TMSI', it may not result in the desired messagc size of around 100 bits.

This is not considered to be a problem, because the IMSI is assumed to be used as initial identity only in a limited number of cases.

ApplicabilitY of methods to legacy systems

It is important to note that the situation in legacy networks e.g. UMTS is somewhat different in the following respects: In legacy networks the AS and NAS-procedures used upon transition from idle to Connected are performed sequentially. Hence, the initial uplink message only includes AS-information

I

o When these networks were designed, less stringent delay requirements were applicable * The size limitation of the initial uplink message is somewhat less stringent i.e. 168 bit in R99 UMTS networks and 238 from REL-6 -onwards In principle the proposed optimisation could equally well be used for the RRC connection request message in UMTS. The proposed optimisation can not be used for the PLMN identity included in the INITIAL DIRECT TRANSFER message, because this message may be received in a cell other than the one the UE had selected when preparing the message.

Note In case cell re-selection occurs, the UE will prepare a new RRC connection request message.

As mentioned in the previous, the situation in legacy networks e.g. UMTS is different. Hence, the proposed solution is assumed not to be applicable to legacy networks References [1] 3GPP TR 25.913: "Requirements for Evolved UTRA and UTRAN" [2] 3GPP TR 25.9 12; "Feasibility Study for Evolved UTRA and UTRAN" [3] 3GPP TR 23.882, "System architecture evolution (SAE): Report on

technical options and conclusions"

[41 3GPP TR 25.813: "Radio interface protocol aspects for Evolved IJTRA" [5] 3GPP TR 25.8 14: "Physical Layer Aspects for Evolved UTRA" [6] 3GPP TS 25.331: Radio Resource Control (RRC); Protocol

Specification

Abbreviations AS Access Stratum. All that extends from below NAS to the actual physical layer.

CN Core Network eNB Enhanced Node B GM1*4 GPRS Mobility Management LA Location Area LTE Long Term Evolution MME Mobility Management Entity NAS Non-Access Stratum. Commonly understood to extend above AS right up to the interface with the application level.

Specifically it is what is given in 3GPP TS 24.008 encompassing the MM, 0MM, CC, SMS, SM, SS.

RA Routing Area SAE System Architecture Evolution SM Session management TA Tracking Area UMTS Universal Mobile Telecommunications System UPE User Plane Entity

Claims (16)

  1. CLAIMS: 1. A method of reducing the size of an initial uplink message
    sent between a mobile terminal and a network element of a mobile communications network, wherein the size of an initial uplink message is reduced by omitting the public land mobile network and/or the tracking area identity in said message.
  2. 2. A method according to claim 1, wherein the public land mobile network and/or the tracking area identity are omitted if i) a network element of the cell in which the mobile terminal sends the initial uplink message broadcasts a single public land mobile network identity and/or a single tracking area identity; and ii) if the corresponding identity to be signalled by the mobile terminal in the initial uplink message is identical to the value that is broadcast in 1).
  3. 3. A method according to claim 1 or 2, wherein the public land mobile network and/or the tracking area identity are omitted if 1) a network element of the cell in which the mobile terminal sends the initial uplink message broadcasts a plurality of public land mobile network identities andlor a plurality of tracking area identities; and ii) if the corresponding identity to be signalled by the mobile terminal in the initial uplink message is identical to one of the values that is broadcast in i).
  4. 4. A method according to claim 3, wherein a pointer to the identity of the serving cell is included in said message.
  5. 5. A method according to any preceding claim, wherein the mobile terminal sends a radio resource connection request message as the initial uplink message.
    using predetermined building blocks.
  6. 6. A method according to any preceding claim, wherein the network elements, when forwarding parts of the initial uplink message to a second network element, includes the omitted public land mobile network and/or tracking area identity.
  7. 7. A mobile terminal for use in a mobile communications network arranged to reduce the size of an initial uplink message sent between a user terminal and a network element of a mobile communications message, wherein the size of an initial uplink message is reduced by omitting the public land mobile network and/or the tracking area identity in said message.
  8. 8. A terminal according to claim 7, arranged to omit the public land mobile network and/or the tracking area identity if i) a network element of the cell in which the mobile terminal sends the initial uplink message broadcasts a single public land mobile network identity and/or a single tracking area identity; and ii) if the corresponding identity to be signalled by the mobile tenninal in the initial uplink message is identical to the value that is broadcast in i).
  9. 9. A terminal according to claim 7 or 8, arranged to omit the public land mobile network and/or the tracking area identity if i) a network clement of the cell in which the mobile terminal sends the initial uplink message broadcasts a plurality of public land mobile network identities and/or a plurality of tracking area identities; and ii) if the corresponding identity to be signalled by the mobile terminal in the initial uplink message is identical to one of the values that is broadcast in i).
  10. 10. A terminal according to claim 9, arranged to include a pointer to the identity of the serving cell.
  11. 11. A terminal according to any of claims 7 to 10, arranged to send a radio resource connection request message as the initial uplink message.
  12. 12. A network element for a mobile communications network, arranged to receive an initial uplink message from a mobile terminal, wherein the size of said initial uplink message is reduced by omitting the public land mobile network and/or the tracking area identity in said message.
  13. 13. A network element according to claim 12, arranged to receive said initial uplink message wherein the public land mobile network and/or the tracking area identity are omitted if i) a network element of the cell in which the mobile terminal sends the initial uplink message broadcasts a single public land mobile network identity and/or a single tracking area identity and ii) if the corresponding identity to be signalled by the mobile terminal in the initial uplink message is identical to the value that is broadcast in i).
  14. 14. A network element according to claim 12 or 13, arranged to receive said initial uplmk message wherein the public land mobile network and/or the tracking area identity are omitted if i) a network element of the cell in which the mobile terminal sends the initial uplink message broadcasts a plurality of public land mobile network identities and/or a plurality of tracking area identities; and ii) if the corresponding identity to be signalled by the mobile terminal in the initial uplink message is identical to one of the values that is broadcast in i).
  15. 15. A network element according to claim 14, wherein a pointer to the identity of the serving cell is included in said message.
  16. 16. A network element according to any of claims 12 to 15, arranged to include the omitted public land mobile network and/or tracking area identity, when forwarding parts of the initial uplink message to a second network element.
GB0619509A 2006-10-03 2006-10-03 Uplink message reduction in mobile communications Withdrawn GB2442514A (en)

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KR1020070099346A KR101378629B1 (en) 2006-10-03 2007-10-02 Apparatus and method for transmitting/receiving a initial uplink message in mobile comminication system
PCT/KR2007/004821 WO2008041816A1 (en) 2006-10-03 2007-10-02 System and method for reducing size of initial uplink message in mobile communication system
GB0719353A GB2442601B (en) 2006-10-03 2007-10-03 Mobile communications

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GB0719353D0 (en) 2007-11-14
KR101378629B1 (en) 2014-03-26

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