GB2442601A - Switching a mobile station between an idle state and an active state - Google Patents

Switching a mobile station between an idle state and an active state Download PDF

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Publication number
GB2442601A
GB2442601A GB0719353A GB0719353A GB2442601A GB 2442601 A GB2442601 A GB 2442601A GB 0719353 A GB0719353 A GB 0719353A GB 0719353 A GB0719353 A GB 0719353A GB 2442601 A GB2442601 A GB 2442601A
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identity
network
message
public land
initial uplink
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GB0719353D0 (en
GB2442601B (en
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Himke Van Der Velde
Gert-Jan Van Lieshout
Kyeongin Jeong
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/04—Protocols for data compression, e.g. ROHC
    • H04Q7/38—
    • H04Q7/3809—
    • H04Q7/3816—
    • H04Q7/3823—
    • H04Q7/3883—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/12—Messaging; Mailboxes; Announcements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

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.

Description

MOBILE COMMUNICATIONS
This invention is concerned with the procedure for switching a mobile station in a wireless communications network between an idle' state and an active' state. The invention has particular, but not exclusive, relevance to transitions between the LTE-Idle and LTE-Active state.
The Long Term Evolution (LTE) wireless communications system 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 the following specifications: 3GPP TR 25.9 13 "Requirements for Evolved UTRA and UTRAN"; 3GPP TR 25.9 12 "Feasibility Study for Evolved UTRA and UTRAN"; 3GPP TR 23.882 "System architecture evolution (SAE): Report on technical options and conclusions"; and 3GPP 25.813 "Radio interface protocol aspects for Evolved UTRA".
One of the requirements for LTE is to have a fast transition from the so-called LIE_Idle to the so-called LTE_Active state, as indicated in the following extract from clause 6.2.1 of 3GPP TR 25.913: Sign fIcantly reduced C-plane latency a) Transition time (excluding downlznk 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 CELLDCH, in such a way that the user plane is established.
Further details about the LTE_Idle and LTE_Active states are provided in clause 5.5.2 of 3GPP TR 25.913, see the following extract: Power-Up Perform "Reolstrstion Inactivity -Allocate C-RNTI, TA-ID, IP addr -Release C-RNTI -Perform Authentication -Allocate DRX for PCH -Establish seainty relation
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 -Includes information to enable fast -Includes all information necessary for -Does not exist transition to LTE_ACTIVE (e g communication secunty key information> Allocated UE-ld(s) Allocated UE-Id(s) Allocated UE-ld(s) -IMSI -IMSI -IMSI -ID unique in Tracking Area (TA-ID) -ID unique in Tracking Area (TA-ID) -ID unique in cell (C.RNTI) -1 or more IP addresses -I or more lP addresses IJE position UE position UE position.
-Known by network at Tracking Area -Known by network at cell level -Not known by network (TA) level Mobility: Mobility Mobility -Handover -PLMN/CeIl selection -Cell reselection DLJUL activity-DLJLJL activity-DL activity -UE may be configured with DRXJDTX -None * UE is configured with DRX penod penods New traffic Change of PLMN/dereglstratiori -Allocate C-RNTI -Deallocate C-RNTI, TA-ID, P address Timeout of penodic TA-update -Deallocate TA-ID, P address E-UTRAN RRC protocol states For a User Equipment (UB), such as a cellular phone, in LTE_Idle, a Mobility Management Entity (MME) maintains a context. The enhanced Node B (eNB) however only maintains a context for UEs in LTE Active.
Upon transition from LTE_Idle to LIE_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 clause 7.14.2 of 3GPP TR 23.882, and is illustrated in Fig. I (corresponding to Fig. 7.14-I in 3GPP TR 23.882).
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 Access Stratum (AS) procedure for establishing a radio connection is combined with the Non Access Stratum (NAS) procedure for re-activating the previously established SAE bearers (referred to as NAS equivalent of Service Request/Accept').
One element 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 IJE i) has no dedicated resources allocated, ii) has no short cell specific identity assigned and iii) does not have an uplink timing which is aligned with the network. Hence, a preliminary message (message 1 in Figure 2) is first sent using a contention based channel for asynchronous uplink transmissions. The information that can be transferred on such a channel is very limited e.g. 4-6 bits. In response to this preliminary message, the eNB sends a message (message 2 in Figure 2) conveying timing information, scheduling information and a cell Random Network Temporary Identifier (c-RNTI).
The UIE then communicates with the eNB using layer 3 protocols such as the Radio Resource Control (RRC) protocol (see messages 3 and 4 in Figure 2). Although the information that can be included in such messages is greater, it is still quite limited for a UE at the cell edge. Some initial analysis shows that it should be possible to transfer around 100 bits when using 2 HARQ re-transmission (1.25 M}Iz bandwidth, I ms TTI).
In order to reduce the transition time between the LTE-Idle and LTE-Active states, it would be desirable to use as few uplink messages as possible 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.l.
Therefore, 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 as a result of the need for uplink/downlink (UL/DL) data 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: 16b 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, _______________ ______ ____ _____ ______ 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 cell measurement 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 Information Need ENB MME Bits Comment Element/Group name _____ _____ _____ ______ 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 UE identity MP -+ 0 Covered by information in the AS-part of the message i.e. P-TMSI, TA identity, PLMN identity 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 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 Service context NA 0 An indication of which PDP info context triggered the message.
Enables aGW to decide which IP connectivity service to re-activate Selective re-activation is _______________ ______ _____ _____ ______ assumed not to e 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 UMIS: 16b 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, 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 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 lE is FFS, cause depending on the scenarios to _________________ _____ _____ _____ _____ be covered TA updata 2 Short message type assumed i.e. this integrated message can only include 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 POP contexts. Used Information Need ENB aGW Bits Comment Element/Group name _____ _____ _____ _____ 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.
The present invention addresses how to reduce the size of such an initial uplink message.
Aspects of the invention are defined by the accompanying claims.
According to one aspect of the present application, the size of an initial uplink message is reduced by omitting the public land mobile network (PLMN) and/or the tracking area (TA) identity in said message. Before forwarding any NAS stratum parts of the message to the core network, the network element receiving the radio message inserts the omitted data so that the UE is unambiguously identified to the core network.
In an embodiment, the public land mobile network and/or the tracking area identity are omitted if a network element of the cell in which the IJE 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 IJE in the initial uplink message is identical to the value that is broadcast.
In another embodiment, 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 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 IJIE in the initial uplink 4' message is identical to one of the values that is broadcast. In this case, the initial message preferably includes a pointer to the identity of the omitted data.
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. The network element may then insert the omitted data before forwarding any NAS part of the initial uplink message to the core network.
Various exemplary embodiments of the invention will now be described 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; Fig. 3 schematically shows the main components of a wireless coommunications network according to an embodiment of the invention; and Fig. 4 is a schematic diagram illustrating the initial access procedure between the UE and the eNB according to one embodiment of the present invention.
Figure 3 schematically shows components of an SAEILTE wireless communication system. As shown, TilEs I a-I c communicate with eNBs 3 via radio signals 5. The eNBs 3 communicate directly with an evolved packet core network 7, which includes a Mobility Management Entity (MIME) 9 and 4' a User Plane Entity (UPE) 11. Access Stratum (AS) messages are communicated between the UEs1 and the eNBs 3, while Non-Access Stratum (NAS) messages are communicated between the UEs I and the evolved packet core network 7.
Each eNB is associated with one or more tracking areas (TAs), and the MME keeps track of the TA within which a UE 1 is located. In addition, each eNB is associated with one or more Public Land Mobile Networks (PLMNs).
When sending a Radio Resource connection Request Message in SAE/LTE, a combination of AS and NAS information is transmitted. As discussed previously, the TA code and the PLIvIN identity contribute significantly to the message size. In this embodiment, it is assumed 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 clauses 10.3.1.7 and 10.3.1.11 of 3GPP TS 25.331 "Radio Resource Control (RRC); Protocol Specification. In particular, these clauses state: 10.3.1.7 Location Area Identification Identfies uniquely a location area for a GSM-MAP type of PLMN. Setting specf led in [5].
In formation 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 string(16) the bit siring contains the most significant bit ________________ _______ _______ ________ 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 to 3 The first element contains the first MNC digit, the second element the second ________________ _______ _______ _____________ MNC digit and so on.
>MNC digit MP _____ INTEGER(O.. 9) _______________ The functionality associated with the identities for which size optimization is proposed will now be briefly discussed.
TA identity In order to resolve potential contentions during initial access, the UE 1 needs to include a globally unique UE 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 I also has 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 PLMIN 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 IJE identity. In the case of network sharing, a cell may broadcast multiple PLMN identities out of which the IJE selects one. in such a case, the UE will have to indicate the selected PLMN to enable the eNB to route the connection request to the appropriate CN node.
in UMTS, the PLMN identities are contained in the Master Information Block, as shown in the extracts from 3GPP TS 25.33 1 below: 10.2.48.8.1 Master Information Block In formation 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 IE REL-6 List PLMN List specifies the PLMNs 10.3.1. 7a of the cell. If absent, the IE "PLMN Identity" specifies _______________ ______ ______ __________ the PLMN of the cell. _______ ANSI-4 I information elements _______ _______ ANSI-41 Core CV-ANSI-41 Network ANSI-Core Information 41 Network In formation _______________ ______ ______ 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 ANS!-4 1 The IE is mandatory present if the IE "Supported PLMN Types" is set to ANSI- 41' or GSM-MAP AND ANSI-4 1', and not _______________________________ needed otherwise 10.3.1. 7a Multiple PLMN List This information element ident/Ies 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 IE is ____________ _____ _____ _______ TRUE. _____ Multiple PLMNs MP 1 to 5 _________ _________________ REL-6 >PLMN identity PLMN REL-6 with Optional identity MCC with Optional
MCC
______________ ______ ______ 10.3.1.lla ________________ ______ In UIMTS, a single Location Area Code (LAC) is signalled, even in the case when network sharing (i.e. multiple PLMN identities) is used. This LAC is contained in the System Information Block type 1, as shown in the extracts from 3GPP TS 25.33 1 below: 10.2.48 8.4 System Information Block type / The system information block type 1 contains NAS system information as well as UE timers and counters to be used in idle mode and in connected mode.
In formation Need Multi Type and Semantics
Element/Group reference description
name ______ _________________ ___________ ____________________ CN in formation elements ______ _________________ ___________ ____________________ CN common MP NAS GSM-MAP NAS system system in formation information (GSM-MAP) ______________ _____ ______________ 10.3.1.9 ________________ CN domain MP I to Send CN information system <maxCNdomains> for each CN domain.
in formation list _____ ________________ __________ ___________________ >CN domain MP CN system domain inform ation system in formation _______________ _____ _______________ 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 Timers 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 with 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 NAS MP Octet The first octet contains system information slring(1..8 octet 1 (5] of the NAS ) system information element, the second octet contains octet 2 of the NAS system information element and __________________ ________ _______ _________ so on.
In this embodiment, the initial uplink message size is reduced by not specifying the UE & PLMN identification within the initial uplink message.
Fig. 4 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 liE I acquires the part of the system information that is broadcast in the cell the UE I has selected, which includes one or, in case network sharing is used, more PLMN identities and NAS-system information which carries the TA code.
In this embodiment, 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, SAE/ LTE may broadcast multiple TA codes.
Master Information Block' Information Need Multi Type and Semantics description Element/Group name ________ ________ reference _____________________ CN information elements _________ PLMN List 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 TiE 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 UE to transmit an initial uplink message), and a cell specific temporary identifier (C-RNTI) Step 3) Upon receiving the Random Access Response', the UE sends the Radio Resource Connection Request message as first uplink L3 message' In this embodiment, if the PLMN identity and/or the TA code to be included in the Radio Resource Connection Request message corresponds with (one of the) corresponding identities that are broadcast in the cell (i.e. acquired by the UE in step 0), the TiE I does not include the full identity in the this message. Instead, the TiE either: * If the cell in which the UE 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 * Signallinclude the (full) identity * If the cell in which the IJE 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 U Signal! include the (full) identity A possible way to specify this is shown below (in the style of 3GPP IS 25.33 1 as set out above): Radio Resource Connection Request' Information Need Multi Type and Semantics description ElementlGroup reference name ________ ________
CHOICE PLMN MP
identity type ________ ________ ___________ _____________________ >Same as MIB entry MP lnteger(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 string(16) value included in the lE 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 by 30-34 bits (The size of the PLMN identity may be 20 bits, while the size of the TA code maybe 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 a size-optimized version of the PLMN identity and/or the TA code, the eNB converts these into a full version of the corresponding identity before forwarding them to the MME 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
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 information elements _________ _________ PLMN List MP _______ ________ ___________________ >PLMN Identity MP PLMN Identity ________________ _______ _______ P-A' __________________ > PLMN Identity MP PLMN Identity ________________ _______ _______ P-B' __________________ >PLMN Identity MP PLMN Identity >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 UE I 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 UB will set the select the Same as MIB entry' value of CHOICE PLN'IN identity type and set it to a value of 1' The TA code that the tilE shall indicate in the Radio Resource Connection Request message is equal to 1-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.
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 UMTS, see the extract from 3GPP TR 25.913 below: 8.1.3.5 Cell re-selection, T300 or T318 timeout 1> f the UE has not yet received an RRC CONNECTION SETUP message with the value of the IE "initial UE identity" equal to the value of the variable INITIAL UEIDENTITY; and 1> f cell re-selection or expiry of timer T300 or timer T318 occurs: the UE shall: 1> check the value of V300; and 2> if V300 is equal to or smaller than N300: 3> f 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 R1?C CONNECTION REQUEST message according to subclause 8.1.3.3; 3> perform the mapping of the Access Class to an Access Service Class as specfied in subclause 8.5.13; and 3> apply she 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 clause 8.5.1 of 3GPP TS 25.331 a visiting/roaming IJE that has a P-TMSI' stored on the SIM will apply this as initial identity i.e. the roaming UB will not revert back to applying the IMSI. This is probably for reasons of identity confidentiality. For visiting TilEs, the IJE may not be able to route the connection request solely based on the Network Routing Information (NRJ, i.e. bits 14-23 of the TMSD.
Consequently, a TilE roaming into 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 message size of around 100 bits.
This is not considered to be a problem, because the IIMSI 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 uplirik message only includes AS-information ) a 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 UIMTS 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.
References [1] 3GPP TR 25.913: "Requirements for Evolved UTRA and UTRAN" [2J 3GPP TR 25.912; "Feasibility Study for Evolved UTRA and UTRAN" [3] 3GPP TR 23.882, "System architecture evolution (SAE): Report on
technical options and conclusions"
[4] 3GPP TR 25.813: "Radio interface protocol aspects for Evolved UTRA" [5] 3GPP TR 25.8 14: "Physical Layer Aspects for Evolved UTRA" [6] 3GPP TS 25.331: Radio Resource Control (R.RC); Protocol
Specification
Abbreviations AS Access Stratum. All that extends from below NAS to the actual physical layer.
CN Core Network eNB Enhanced Node B GMM GPRS Mobility Management LA Location Area LTE Long Term Evolution MIME 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, GMM, 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 (18)

  1. CLAll4S: 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 i).
  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 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).
  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. )
  6. 6. A method according to any preceding claim, wherein the network element, when forwarding parts of the initial uplink message to a second network element, includes the omitted public land mobile network andlor 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 arid 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 andlor 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 terminal 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 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).
  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 andlor 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 uplrnk 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 andIor tracking area identity, when forwarding parts of the initial uplink message to a second network element.
  17. 17. A wireless communication system in which a mobile station is operable to communicate with a core network via a radio access network, wherein the radio access network comprise a plurality of radio access nodes with each radio access node being associated with one or more tracking areas and one or more public land mobile networks, wherein the mobile station is operable to send an initial connection request message conveying information for the core network, wherein the connection request message omits the full identity of a tracking area and/or a public land mobile network, and wherein the radio access network is operable to detennine the omitted tracking area andlor public land mobile network before forwarding the information for the core network conveyed by the initial connection request.
  18. 18. A system according to claim 17, wherein at least one radio access node is operable to transmit data identifying the one or more associated tracking areas and the one or more associated public land mobile networks, and wherein the mobile station is operable to omit the full identity of the tracking area andlor public land mobile network if the full identity was transmitted by the radio access node in which the mobile station is located.
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WO2014113953A1 (en) 2013-01-24 2014-07-31 Nokia Corporation Method and apparatus for cell reselection
CN110383939B (en) 2017-01-05 2023-09-22 日本电气株式会社 Wireless terminal, base station, methods therefor, and non-transitory computer-readable medium

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