WO2016037642A1 - Transfert depuis 3gpp vers acces non 3 gpp non securise base sur des caracteristiques de voie de transmission mesurees - Google Patents

Transfert depuis 3gpp vers acces non 3 gpp non securise base sur des caracteristiques de voie de transmission mesurees Download PDF

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Publication number
WO2016037642A1
WO2016037642A1 PCT/EP2014/069179 EP2014069179W WO2016037642A1 WO 2016037642 A1 WO2016037642 A1 WO 2016037642A1 EP 2014069179 W EP2014069179 W EP 2014069179W WO 2016037642 A1 WO2016037642 A1 WO 2016037642A1
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WO
WIPO (PCT)
Prior art keywords
network
mobile terminal
wlan
radio access
physical property
Prior art date
Application number
PCT/EP2014/069179
Other languages
English (en)
Inventor
Daniel Nilsson
Anders LUNDSTRÖM
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/EP2014/069179 priority Critical patent/WO2016037642A1/fr
Priority to PCT/EP2014/075786 priority patent/WO2016037670A1/fr
Publication of WO2016037642A1 publication Critical patent/WO2016037642A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • 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
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the invention relates to a network device and a method at the network device of determining whether to perform handover of the mobile terminal in a
  • the invention further relates to a computer program
  • the mobile terminal is typically a User Equipment (UE) such as a mobile phone, a personal digital assistant (PDA), a mobile phone, a personal digital assistant
  • PDA personal digital assistant
  • a smart phone a tablet, a laptop, a media player, etc.
  • Figure 1 shows a schematic overview of an exemplifying wireless
  • the UE may at an instance be connected to a base station, such as an eNodeB, via a network referred to as Evolved Universal Terrestrial Radio Access Network (E-UTRAN) for LTE communication with the UE over an air
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • LTE-Uu 20 interface
  • Evolved The core network in LTE is known as Evolved
  • EPC Packet Core
  • EPS Evolved Packet System
  • Illustrated in Figure 1 are also RANs in the form of trusted/untrusted
  • TWAG Wireless Access Gateway
  • AC Access Controller
  • the UE may connect to the ePDG via an SWu interface to establish a communication channel with the EPC
  • SIM Subscriber Identity Module
  • IPsec Internet Protocol Security
  • IKE Internet Key Exchange
  • the UE may have an ongoing call over the E-UTRAN and when the UE comes within reach of the WLAN, it connects to the EPC via the WLAN and is subsequently handed over from the E-UTRAN to the WLAN.
  • the connection with the E-UTRAN is thus released, and the call will proceed over WLAN.
  • This process should preferably be effected with minimal interruption (e.g. with a silent period of less than one second).
  • a problem in the art is that the UE may be handed over to the WLAN even if the quality of the connection is not high enough for the call to continue. In such a case, it would have been better if the UE had remained with the E-UTRAN instead of being handed over.
  • (a) handover of the UE to WLAN is based on the WLAN signal strength; if the signal strength of a WLAN access point (AP) as measured by the UE is above a handover threshold, then WLAN access is selected,
  • AP WLAN access point
  • (b) handover of the UE to WLAN is based on WLAN load and backhaul capacity; a WLAN AP provides appropriate beacon information to the UE, from which the UE can determine whether to handover; and
  • An object of the present invention is to solve, or at least mitigate, this problem in the art and thus to provide an improved method and device for handing over a mobile terminal from one radio access network to another.
  • This object is attained in a first aspect of the present invention by a method of determining whether to perform handover of a mobile terminal in a wireless communications network from a radio access network to a wireless local area network.
  • the method comprises measuring a physical property of a communication path established between the mobile terminal and a packet core network gateway node via the wireless local area network, determining whether the measured physical property complies with at least one
  • a network device configured to determine whether to perform handover of a mobile terminal in a wireless communications network from a radio access network to a wireless local area network.
  • the network device comprises a processing unit and a memory, which memory contains instructions executable by the processing unit, whereby the network device is operative to measure a physical property of a communication path established between the mobile terminal and a packet core network gateway node via the wireless local area network, and to determine whether the measured physical property complies with at least one communication path quality criterion. If so, the mobile terminal is handed over from the radio access network to the wireless local area network.
  • a computer program performing the method according to the present invention, and a computer program product comprising computer readable medium having the computer programs embodied therein.
  • a physical property of a communication path between a mobile terminal and a packet core network gateway node, such as an ePDG, via a WLAN the property being one or more of e.g. bandwidth, latency, jitter, packet loss, etc.
  • a RAN such as for instance E-UTRAN
  • the handover before effecting the handover from for example E-UTRAN to WLAN, it is ensured by the measurement of the quality of the communication between the mobile terminal and the ePDG via the WLAN AP that the communication path is good enough to handle the ongoing communication session, in which case a handover of the mobile terminal is performed. If not, the mobile terminal remains in the E-UTRAN, and no handover is performed.
  • the property measured could be packet loss of the communication path setup between the mobile terminal and the ePDG acting as a gateway between the WLAN and the EPC. If the criteria is that the packet loss cannot exceed 3%, and the measured packet loss rate is 2%, the mobile terminal is handed over to the ePDG (i.e. WLAN access is effected), since the criteria is complied with.
  • the method can either be performed at the mobile terminal or the packet core network gateway node. It can even be envisaged that some steps of the method are performed at the mobile terminal while others are performed at the packet core network gateway node. For instance, the measuring of a physical property of a communication path established between the mobile terminal and a packet core network gateway node via the wireless local area network, and the determining whether the measured physical property complies with at least one communication path quality criterion are performed by the mobile terminal, wherein the packet core network gateway node is informed accordingly and performs the step of handing over the mobile terminal from the radio access network to the wireless local area network.
  • VoIP Voice over LTE
  • a property of the communication path established between the mobile phone and the ePDG via the WLAN AP i.e. the ePDG being located uplink from the AP, thereby acting as a gateway to the EPC
  • packet loss, or latency is measured, and if the quality of the communication path from the mobile phone to the ePDG is considered good enough, the mobile phone will be handed over to the WLAN where the phone call will continue, while the connection established over the E-UTRAN is released.
  • a plurality of communication path properties may be measured, for instance both packet loss and channel latency, in which case the criteria may be e.g. that the measured packet loss should be below 3% while maximum channel latency is not exceeded for the handover to be effected.
  • further physical properties of the communication path between the mobile terminal and the packet core network gateway to be measured and evaluated comprise one or more of (where uplink denotes direction on the communication path from the mobile terminal to the ePDG, while downlink denotes direction on the communication path from the ePDG to the mobile terminal):
  • Uplink + downlink one-way latency This requires synchronized clocks and could be achieved using Global Positioning System (GPS) in the mobile terminal. ⁇ Roundtrip time/latency.
  • Uplink + downlink delay variation (either between two sequential data packets or a difference in variation between e.g. a respective packet and the packet with the lowest packet delay).
  • Figure 1 shows a schematic overview of an exemplifying wireless
  • Figure 2 illustrates a flowchart of an embodiment of the method according to the present invention
  • FIG. 3 illustrates a further embodiment of the present invention.
  • FIG. 4 shows a network device according to an embodiment of the present invention.
  • the wireless communication system 100 is an LTE based system. It should be pointed out that the terms "LTE” and "LTE based” system is here used to comprise both present and future LTE based systems, such as, for example, advanced LTE systems. It should be appreciated that although Figure 1 shows a wireless communication system 100 in the form of an LTE based system, the example embodiments herein may also be utilized in connection with other wireless communication systems, such as e.g. Global System for Mobile Communications (GSM) or Universal Mobile
  • UMTS Telecommunication System
  • the wireless communication system 100 comprises one or more base stations in the form of eNodeBs, operatively connected to a Serving Gateway (SGW), in turn operatively connected to a Mobility Management Entity (MME) and a Packet Data Network Gateway (PGW), which in turn is operatively connected to a Policy and Charging Rules Function (PCRF).
  • SGW Serving Gateway
  • MME Mobility Management Entity
  • PGW Packet Data Network Gateway
  • PCRF Policy and Charging Rules Function
  • the eNodeB is a radio access node that interfaces with a mobile radio terminal 101, e.g. a UE or an Access Point.
  • the eNodeB of the system forms the radio access network called Evolved Universal Terrestrial Radio Access Network (E-UTRAN) 102 for LTE communicating with the UE 101 over an air interface such as LTE-
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • EPC Evolved Packet Core
  • EPS Evolved Packet System
  • the SGW routes and forwards user data packets over the Si-U interface, whilst also acting as the mobility anchor for the user plane during inter-eNodeB handovers and as the anchor for mobility between LTE and other 3rd Generation Partnership Project (3GPP) technologies (terminating S4 interface and relaying the traffic between 2G/3G systems and PGW).
  • 3GPP 3rd Generation Partnership Project
  • the SGW terminates the downlink data path and triggers paging when downlink data arrives for the UE 101, and further manages and stores UE contexts, e.g.
  • the SGW communicates with the MME via interface S11 and with the PGW via the S5 interface. Further, the SGW may communicate with the UMTS radio access network UTRAN and with the GSM EDGE ("Enhanced Data rates for GSM Evolution") Radio Access Network (GERAN) via the S12 interface.
  • GSM EDGE Enhanced Data rates for GSM Evolution
  • GERAN Radio Access Network
  • the MME is responsible for idle mode UE tracking and paging procedure including retransmissions. It is involved in the bearer activation/deactivation process and is also responsible for choosing the SGW for a UE at the initial attach and at time of intra- LTE handover involving core network node relocation. It is responsible for authenticating the user by interacting with the Home Subscriber Server (HSS).
  • HSS Home Subscriber Server
  • the Non-Access Stratum (NAS) signaling terminates at the MME and it is also responsible for generation and allocation of temporary identities to UEs via the Si-MME interface. It checks the authorization of the UE 101 to camp on the service provider's Public Land Mobile Network (PLMN) and enforces UE roaming restrictions.
  • PLMN Public Land Mobile Network
  • the MME is the termination point in the network for ciphering/integrity protection for NAS signaling and handles the security key management. Lawful interception of signaling is also supported by the MME.
  • the MME also provides the control plane function for mobility between LTE and 2G/3G access networks with the S3 interface terminating at the MME from the Serving General Packet Radio Service (GPRS) Support Node (SGSN).
  • GPRS General Packet Radio Service
  • SGSN Serving General Packet Radio Service
  • the MME also terminates the S6a interface towards the home HSS for roaming UEs. Further, there is an interface Sio configured for communication between MMEs for MME relocation and MME-to-MME information transfer.
  • the PGW provides connectivity to the UE 101 to external packet data networks (PDNs) by being the point of exit and entry of traffic for the UE 101.
  • PDNs packet data networks
  • a UE may have simultaneous connectivity with more than one PGW for accessing multiple PDNs.
  • the PGW performs policy enforcement, packet filtering for each user, charging support, lawful Interception and packet screening.
  • Another key role of the PGW is to act as the anchor for mobility between 3GPP and non-3GPP technologies such as WiMAX and 3GPP2 (CDMA lX and EvDO).
  • the interface between the PGW and the packet data network being for instance the Internet, is referred to as the SGi.
  • the packet data network may be an operator external public or private packet data network or an intra operator packet data network, e.g.
  • the PCRF determines policy rules in real-time with respect to the radio terminals of the system. This may e.g. include aggregating information in real-time to and from the core network and operational support systems, etc. of the system so as to support the creation of rules and/or automatically making policy decisions for user radio terminals currently active in the system based on such rules or similar.
  • the PCRF provides the PGW with such rules and/or policies or similar to be used by the acting PGW as a Policy and Charging Enforcement Function (PCEF) via interface Gx.
  • PCEF Policy and Charging Enforcement Function
  • the PCRF further communicates with the packet data network via the Rx interface.
  • the system further comprises a 3GPP Authentication, Authorization and Accounting (AAA) server, which takes care of the authentication,
  • AAA 3GPP Authentication, Authorization and Accounting
  • the ePDG 105 further connects to the PGW via interface S2B/GTP.
  • the 3GPP AAA server also connects to the HSS via interface SWx, to the PGW via interface S6b, and to an AC/TWAG via interface STa.
  • the AC/TWAG provides a gateway for the UE 101 between the EPC network and trusted WLAN and further connects to the PGW via interface S2a/GTP.
  • the UE 101 connects to the WLAN 103 via an access point (AP).
  • AP access point
  • the method at the mobile terminal 101 i.e. the UE of determining whether to handover to the WLAN is performed by a processing unit 115 embodied in the form of one or more microprocessors arranged to execute a computer program 117 downloaded to a suitable storage medium 116 associated with the microprocessor, such as a Random Access Memory (RAM), a Flash memory or a hard disk drive.
  • a processing unit 115 embodied in the form of one or more microprocessors arranged to execute a computer program 117 downloaded to a suitable storage medium 116 associated with the microprocessor, such as a Random Access Memory (RAM), a Flash memory or a hard disk drive.
  • RAM Random Access Memory
  • Flash memory Flash memory
  • the processing unit 115 and the storage medium are included in the UE 101.
  • the processing unit 115 is arranged to carry out the method according to embodiments of the present invention when the appropriate computer program 117 comprising computer- executable instructions is downloaded to the storage medium 116 and executed by the processing unit 115.
  • the computer program 117 may be transferred to the storage medium 16 by means of a suitable computer program product, such as a Digital Versatile Disc (DVD) or a memory stick.
  • a suitable computer program product such as a Digital Versatile Disc (DVD) or a memory stick.
  • the computer program 117 may be downloaded to the storage medium 116 over a network.
  • the processing unit 115 may alternatively be embodied in the form of a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a complex programmable logic device (CPLD), etc.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array
  • CPLD complex programmable logic device
  • FIG. 2 illustrates a flowchart of an embodiment of the method of the present invention of determining whether to perform handover of the UE 101 in the wireless communications network 100 of Figure 1 from a radio access network 102 such as E-UTRAN to the untrusted WLAN 103.
  • a radio access network 102 such as E-UTRAN
  • a first step S101 when the UE 101 comes into reach of the untrusted WLAN 103, it measures a physical property of a communication path 104 established between the UE 101 and the ePDG 105, for instance round-trip latency.
  • a communication path 104 established between the UE 101 and the ePDG 105
  • packet data parameters of the path 104 uplink of the AP extending to the ePDG 105.
  • a second step S102 if the value of the round-trip latency is determined to comply with a predetermined quality criterion of the communication path 104, such as e.g. being below a
  • step S201 the UE 101 is connected to LTE via the E- UTRAN 102 and is engaged in an ongoing communication session in the form of a VoLTE call.
  • step S202 the UE 101 enters a WLAN 103 and performs an authentication process with the AP of the WLAN 103 using the WLAN Service Set Identifier (SSID).
  • the authentication could be undertaken using any known appropriate authentication mechanism, such as an Extensible Authentication Protocol (EAP) employing an Authentication and Key
  • EAP Extensible Authentication Protocol
  • AKA Agreement
  • WPA2 Protected Access 2
  • the UE 101 Upon successful authentication with the WLAN 103, the UE 101 will be assigned an Internet connection. However, the UE 101 still uses the established E-UTRAN connection for the VoLTE call.
  • step S203 using the WLAN internet connection, the UE 101 performs ePDG selection using Domain Name System (DNS) queries.
  • DNS Domain Name System
  • the 101 may alternatively be preconfigured to select a certain ePDG.
  • the UE 101 measures a physical property of the communication path 104 setup between the UE 101 and the ePDG 105 (for instance latency) in step S204 using for instance a protocol known as Two-Way Active Measurement Protocol (TWAMP). If the measured latency is considered small enough, the UE 101 is handed over to the WLAN AP in step S205 and the call proceeds with the EPC via the ePDG 105, while allocated resources in the E-UTRAN 102 is released. If not, the call is maintained over the E-UTRAN 102, and no channel is setup via the WLAN 103.
  • TWAMP Two-Way Active Measurement Protocol
  • the UE 101 may further, in case path quality is considered good enough, authenticate itself towards the ePDG 105 in step S205 using EAP-AKA or EAP-SIM utilizing Internet Key Exchange (IKE) over the SWu interface.
  • EAP-AKA or EAP-SIM utilizing Internet Key Exchange (IKE) over the SWu interface.
  • the measurement session should be setup such that conditions are comparable for the ongoing communication session via the E-UTRAN 102 and the communication path between the UE 101 and the ePDG 105, for instance sending the same amount of test packets per seconds as is used in the VoLTE flow.
  • the packet size should preferably also be of the same order.
  • the length of the measurement may depend on the quality of the 3GPP connection; if it is good enough, the measurement period can be relatively long (-10 seconds). If 3GPP coverage is not good, a shorter test period can be selected (-0.5 seconds).
  • steps S201, S205 and S205 of Figure 3 correspond to steps S101, S102 and S103, respectively, of Figure 2.
  • FIG 4 shows a network device 101 according to an embodiment of the present invention.
  • the network device 101 comprises measuring means 401 adapted to measure a physical property of a communication path established between a mobile terminal and a packet core network gateway node via a WLAN, determining means 402 adapted to determine whether the measured physical property complies with at least one communication path quality criterion. Further, the network device 101 comprises performing means 403 adapted to performing a handover of the mobile terminal from the radio access network to the WLAN.
  • the measuring means 401 and/or the performing means 403 may comprise a communications interface for receiving and providing information to other devices.
  • the network device 101 may further comprise a local storage for storing obtained data.
  • the measuring means 401, determining means 402 and performing means 403, may (in analogy with the description given in connection to Figure 1) be implemented by a processor embodied in the form of one or more
  • the measuring means 401 and performing means 403 may comprise one or more transmitters and/or receivers and/or transceivers, comprising analogue and digital components and a suitable number of antennae for radio communication.

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

Abstract

La présente invention concerne un terminal mobile (101 105) et un procédé pour déterminer s'il faut réaliser le transfert du terminal mobile dans un réseau de communication sans fil depuis un réseau d'accès radio (102), par exemple, un réseau E-UTRAN, vers un réseau local sans fil non sécurisé (103), par exemple un réseau WLAN. Le procédé pour déterminer s'il faut effectuer un transfert d'un terminal mobile (101) dans un réseau de communication sans fil à partir d'un réseau d'accès radio (102) vers un réseau local sans fil (103) comprend la mesure (S101) d'une propriété physique d'une voie de transmission établie entre le terminal mobile (101) et un nœud de passerelle de réseau fédérateur à commutation de paquets ePDG (105) via le réseau local sans fil (103), la détermination (S102) de la conformité ou non de la propriété physique mesurée avec au moins un critère de qualité de voie de transmission; et dans l'affirmative, le transfert (S103) du terminal mobile (101) depuis le réseau d'accès radio (102) vers le réseau local sans fil (103).
PCT/EP2014/069179 2014-09-09 2014-09-09 Transfert depuis 3gpp vers acces non 3 gpp non securise base sur des caracteristiques de voie de transmission mesurees WO2016037642A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2014/069179 WO2016037642A1 (fr) 2014-09-09 2014-09-09 Transfert depuis 3gpp vers acces non 3 gpp non securise base sur des caracteristiques de voie de transmission mesurees
PCT/EP2014/075786 WO2016037670A1 (fr) 2014-09-09 2014-11-27 Transfert depuis 3gpp vers acces non 3gpp non securise base sur des caracteristiques de voies de transmission mesurees

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Application Number Priority Date Filing Date Title
PCT/EP2014/069179 WO2016037642A1 (fr) 2014-09-09 2014-09-09 Transfert depuis 3gpp vers acces non 3 gpp non securise base sur des caracteristiques de voie de transmission mesurees

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PCT/EP2014/075786 WO2016037670A1 (fr) 2014-09-09 2014-11-27 Transfert depuis 3gpp vers acces non 3gpp non securise base sur des caracteristiques de voies de transmission mesurees

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CN111163493B (zh) * 2018-11-08 2022-08-19 中国电信股份有限公司 通信配置方法、***和相关设备

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