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Method of Handling Non-Access Stratum Message and Related Communication Device

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Method of Handling Non-Access Stratum Message and Related Communication Device (19) TZZ Z_T (11) EP 2 704 456 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 05.03.2014 Bulletin 2014/10 H04W 4/00 (2009.01) H04W 76/02 (2009.01) (21) Application number: 13181635.7 (22) Date of filing: 25.08.2013 (84) Designated Contracting States: (71) Applicant: HTC Corporation AL AT BE BG CH CY CZ DE DK EE ES FI FR GB Taoyuan County 330 (TW) GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (72) Inventor: Liao, Ching-Yu Designated Extension States: 330 Taoyuan City (TW) BA ME (74) Representative: Konkonen, Tomi-Matti Juhani (30) Priority: 29.08.2012 US 201261694276 P Murgitroyd & Company 22.08.2013 US 201313974005 Scotland House 165-169 Scotland Street Glasgow G5 8PL (GB) (54) Method of Handling Non-Access Stratum Message and Related Communication Device (57) Amethod ofhandling non- accessstratum (NAS) level to a network in the wireless communication system, mobility management (MM) messages for a user equip- and storing a priority indicator indicating the first priority ment in a wireless communication system when the user level in a nonvolatile memory if the user equipment re- equipment is configured for dual priority includes sending ceives a NAS MM reject message with a mobility man- a first NAS MM request message containing a first priority agement back-off (MMBK) timer from the network. EP 2 704 456 A1 Printed by Jouve, 75001 PARIS (FR) 1 EP 2 704 456 A1 2 Description the clear of the PPF, the core network cannot page the UE during the period of the implicit detach timer. If the Background of the Invention implicit detach timer expires before the UE contacts the network, the network shall implicitly detach the UE. The 1. Field of the Invention 5 implicit detach timer shall be stopped when a NAS sign- aling connection is established for the UE. [0001] The present invention relates to a method used [0005] NAS level congestion control contains functions in a wireless communication system and related commu- of "APN based congestion control" and "General NAS nication device, and more particularly, to a method of level Mobility Management control". The use of the APN handling non-access stratum (NAS) messages in a wire- 10 based congestion control is for avoiding and handling of less communication system and related communication EMM and ESM signalling congestion associated with device. UEs with a particular APN. With General NAS level Mo- bility Management control, the MME may also use the 2. Description of the Prior Art reject of NAS level Mobility Management signaling re- 15 quests under general congestion conditions. [0002] A long-term evolution (LTE) system supporting [0006] When the NAS level mobility management con- the 3GPP Rel-8 standard and/or the 3GPP Rel- 9 stand- gestion control is applied due to network overload or con- ard is developed by the 3rd Generation Partnership gestion, the MME rejects an attach request, a tracking Project (3GPP) as a successor of a universal mobile tel- area update (TAU), a routing area update (RAU) or a ecommunications system (UMTS), for further enhancing 20 service request from the UE, and the MME replies the performance of the UMTS to satisfy users’ increasing UE with a mobility management back-off timer (MMBK) needs. The LTE system includes a new radio interface in a reject message. Then, the MME/ SGSN enforces the and radio network architecture that provides a high data MMBK timer by immediately rejecting any subsequent rate, low latency, packet optimization, and improved sys- request from the UE targeting at connecting to the APN tem capacity and coverage. In the LTE system, a radio 25 before the MMBK timer is expired. access network known as an evolved universal terrestrial [0007] When the UE is configured for dual priority, the radio access network (E-UTRAN) includes a plurality of UE is configured for NAS signaling low priority and also evolved Node-Bs (eNBs) for communicating with a plu- configured to override the NAS signaling low priority in- rality of user equipments (UEs) and communicates with dicator. For example, the UE is allowed to initiate a NAS a core network including a mobility management entity 30 mobility management (MM) request message without in- (MME), a serving gateway, etc. for NAS (Non Access dicating low access priority while an MMBK timer for an- Stratum) control. In UMTS system, a Serving GPRS Sup- other NAS MM request message with a low priority indi- port Node (SGSN) is responsible for the delivery of data cator is running. However, if the UE is switched off and packets to the mobile devices back and forth within its then switched on before the expiry of an MMBK timer, geographical service area, including packet routing and 35 the UE cannot determine which priority level the MMBK transfer, mobility management (attach/detach and loca- timer is associated to. In such a situation, the perform- tion management), logicallink management, and authen- ance of the UE may be decreased. tication and charging functions. The MME provides the [0008] Similar problems occur when the UE configured control plane function for mobility between LTE and 2G/ for dual priority has received a session management 3G access networks with the S3 interface terminating at 40 back-off (SMBK) timer for a specific APN. the MME from the SGSN. [0009] Thus, how to handle NAS messages and back- [0003] An access point name (APN) is used in the LTE off timers properly when the UE is configured for dual and LTE-advanced (LTE-A) systems for establishing priority is a topic to be addressed and discussed in the packet data connections, and is managed by the MME. industry. Further, the APN is used for identifying a packet data 45 network (PDN) or a service type (e.g. multimedia mes- Summary of the Invention saging service (MMS)), wherein the PDN or the service type is carried on the packet data connections. [0010] It is an object of present invention to provide [0004] The core network manages the mobile reacha- handling non-access stratum messages. bility by using mobile reachable timer, paging proceed 50 This object can be achieves by the features defined in factor (PPF), and implicit detach timer. The core network the independent claims. Further enhancements are char- supervises the periodic tracking/ routing/location area up- acterised by the dependent claims. At least one embod- dating procedure of the UE via the mobile reachable tim- iment of the present invention therefore provides a meth- er. By default, the mobile reachable timer is set slightly od and related communication device for handling non- larger than the periodic TAU/RAU/LAU timer. Upon ex- 55 access stratum (NAS) messages so that the communi- piry of the mobile reachable timer, the network shall clear cation device configured for dual priority can operate the PPF flag and start the implicit detach timer. The value properly when a back-off timer is running. of the implicit detach timer is network dependent. Due to [0011] At least one embodiment of the present inven- 2 3 EP 2 704 456 A1 4 tion discloses a method of handling non-access stratum skill in the art after reading the following detailed descrip- (NAS) mobility management (MM) messages for a user tion of the preferred embodiment that is illustrated in the equipment in a wireless communication system when the various figures and drawings. user equipment is configured for dual priority. The meth- od includes sending a first NAS MM request message 5 Brief Description of the Drawings containing a first priority level to a network in the wireless communication system; and storing a priority indicator [0016] FIG. 1 is a schematic diagram of a wireless com- indicating the first priority level in a non- volatile memory munications system according to an example of the if the user equipment receives a NAS MM reject message present invention. with a mobility management back- off (MMBK) timer from 10 [0017] FIG. 2 is a schematic diagram of a communica- the network. tion device according to an example of the present in- [0012] At least one embodiment of the present inven- vention. tion further discloses a method of handling non-access [0018] FIG. 3 is a flowchart of a process according to stratum (NAS) session management (SM) messages for an example of the present invention. a user equipment in a wireless communication system 15 [0019] FIG. 4 is a flowchart of a process according to when the user equipment is configured for dual priority. an example of the present invention. The method includes sending a first NAS SM request message containing a first priority level for a specific ac- Detailed Description cess point name (APN) to a network in the wireless com- munication system; and storing a priority indicator indi- 20 [0020] Please refer to FIG. 1, which is a schematic di- cating the first priority level for the specific APN in a non- agram of a wireless communication system 10 according volatile memory if the user equipment receives a NAS toan example of the presentinvention. The wireless com- SM reject message with a session management back- munication system 10, such as a General Packet Radio off (SMBK) timer for the specific APN from the network. Service (GPRS) system, a Global System for Mobile [0013] At least one embodiment of the present inven- 25 communications (GSM) system, a Universal Mobile Tel- tion further discloses a communication device for han- ecommunications System (UMTS), a Long Term Evolu- dling non-access stratum (NAS) mobility management tion (LTE) system, a Long Term Evolution-advanced (MM) messages in a wireless communication system, (LTE-A) system, or other mobile communication sys- wherein the communication device is configured for dual tems, is briefly composed of a network and a plurality of priority.
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