WO2006064390A2 - Procede et appareil pour garantir la qualite de service lors d'un transfert intercellulaire - Google Patents

Procede et appareil pour garantir la qualite de service lors d'un transfert intercellulaire Download PDF

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Publication number
WO2006064390A2
WO2006064390A2 PCT/IB2005/054038 IB2005054038W WO2006064390A2 WO 2006064390 A2 WO2006064390 A2 WO 2006064390A2 IB 2005054038 W IB2005054038 W IB 2005054038W WO 2006064390 A2 WO2006064390 A2 WO 2006064390A2
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communication
qos parameters
communication network
network
wlan
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PCT/IB2005/054038
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English (en)
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WO2006064390A3 (fr
Inventor
Xiaohui Jin
Xiaoling Shao
Bo Liu
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Koninklijke Philips Electronics N.V.
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Publication of WO2006064390A2 publication Critical patent/WO2006064390A2/fr
Publication of WO2006064390A3 publication Critical patent/WO2006064390A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2408—Traffic characterised by specific attributes, e.g. priority or QoS for supporting different services, e.g. a differentiated services [DiffServ] type of service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2441—Traffic characterised by specific attributes, e.g. priority or QoS relying on flow classification, e.g. using integrated services [IntServ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2491—Mapping quality of service [QoS] requirements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/76—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions
    • H04L47/765—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions triggered by the end-points
    • H04L47/767—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions triggered by the end-points after changing the attachment point, e.g. after hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/78—Architectures of resource allocation
    • H04L47/783—Distributed allocation of resources, e.g. bandwidth brokers
    • H04L47/785—Distributed allocation of resources, e.g. bandwidth brokers among multiple network domains, e.g. multilateral agreements
    • H04L47/786—Mapping reservation between domains
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/808—User-type aware
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/824—Applicable to portable or mobile terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/829—Topology based
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • 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
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the present invention relates generally to a communication network technique, and more particularly, to a method and apparatus for guaranteeing QoS (Quality of Service).
  • QoS Quality of Service
  • WLAN Wireless Local Area Network
  • hotspots such as airports and hotels
  • People can use wireless terminals, such as mobile phones or laptops, via wireless access, to access the network resources in a WLAN, and the resources on Internet connected with the WLAN.
  • WWAN Wireless Wide Area Network
  • GSM Global System for Mobile Communication
  • GPRS General Packet Radio Service
  • CDMA Code Division Multiple Access
  • 3G Third-Generation Mobile Communication
  • WWAN provides voice service while WLAN provides data service.
  • WLAN provides data service.
  • Fig.l shows the conventional application of WLAN and WWAN, wherein a WWAN service area and a WLAN service area are likely to be overlaid or not, as shown in Fig.l.
  • a mobile user outside the WLAN service area performs voice communication through the WWAN service
  • the communication costs for both parties can't be lowered only if WWAN service is still adopted at that time.
  • WWAN service is switched to WLAN service, the radio resource for WWAN can be saved, the communication costs for both parties can be decreased remarkably, and it becomes possible to provide the users with richer services like video communication and etc as well.
  • a packet-based communication including wire communication network and wireless communication network
  • information is transmitted over the network in the form of packets and the nodes in the network forward the packets in store-and-forward mechanism.
  • Network nodes and the resources in the communication channel are shared by all ongoing end-to-end communication procedures.
  • the delay exceeds a certain threshold, packets tend to be dropped and thus the communication quality will deteriorate.
  • a wireless communication network such as GPRS network in WWAN and the network adopting IEEE 802.11 protocols in WLAN
  • packets tend to be dropped more easily due to the more outstanding bandwidth limitation of the wireless channel, as well as the uncertain channel fading and influences from cell handover and etc.
  • communication services therefore, are affected differently.
  • QoS parameters are set correspondingly in the communication standard adopted by each communication network so that the data forwarded by each network node can satisfy the requirements for QoS parameters, thus guaranteeing a certain QoS.
  • An object of the present invention is to provide a method and apparatus for guaranteeing end-to-end QoS, so that the communication services used by the user can satisfy the end-to-end QoS requirements when the UE switches between WLAN and WWAN.
  • Another object of the present invention is to provide a reliable handover method, for the UE to perform the corresponding handover operations when assured of having entered or left WLAN coverage area, thus to avoid the aggravation of the system control load brought by frequent handovers between WWAN and WLAN and the possible communication interruption caused therein.
  • a method and apparatus for guaranteeing end-to-end QoS comprising the steps of: determining the types of the multiple communication networks through which the end-to-end communication passes, wherein the types of the communication networks are based on the communication standards adopted by the communication networks; negotiating with each communication network for the QoS parameters for each communication network according to the types of the multiple communication networks; establishing the end-to-end communication by using the negotiated QoS parameters for each communication network.
  • a communication apparatus for guaranteeing end-to-end QoS comprising: a determining unit, for determining the types of the multiple communication networks through which the end-to-end communication passes, wherein the types of the communication networks are based on the communication standards adopted by the communication networks; a negotiating unit, for negotiating with each communication network for the QoS parameters for each communication network according to the types of the multiple communication networks; a communicating unit, for establishing the end-to-end communication by using the negotiated QoS parameters for each communication network.
  • Fig.l illustrates a schematic diagram of a conventional integrated application between WWAN and WLAN
  • Fig.2 illustrates a diagram in which a UE capable of handover between WWAN and WLAN is performing end-to-end communication with another UE via Internet
  • Fig.3 illustrates the flowchart of the UE performing end-to-end communication with said another UE via Internet when switching from WWAN to WLAN;
  • Fig.4 illustrates the flowchart of the UE performing end-to-end communication with said another UE via Internet when switching from WLAN to WWAN;
  • Fig.5 illustrates the block diagram of the configuration of the UE according to an embodiment of the present invention.
  • the UE when a UE through WWAN access performs end-to-end communication with another UE, if the UE attempts to switch from WWAN to WLAN during the communication, it maintains the communication through WWAN and at the same time negotiates with WLAN for the QoS parameters by using the WLAN QoS parameters, so as to reserve the required WLAN resources.
  • the UE can also negotiate via WLAN with Internet for the QoS parameters to be used in Internet (also referred as Internet QoS parameters), to guarantee that the data transmission over Internet can meet a certain QoS requirement while through WLAN access.
  • the UE When the UE switches to communicate in WLAN, it can evaluate the data transmitted in WLAN and Internet, by using the resources reserved in WLAN and Internet respectively and the WLAN QoS parameters and Internet QoS parameters respectively. Therefore, the end-to-end communication between two UEs can satisfy the QoS requirement as long as each transmission segment forming the communication line satisfies the corresponding requirement for QoS parameters.
  • the UE when the UE attempts to switch from WLAN to WWAN, it can also reserve WWAN and Internet resources according to the WWAN QoS parameters and Internet QoS parameters, and then switches to communicate through WWAN and Internet so as to guarantee that the end-to-end QoS can satisfy the corresponding traffic requirement.
  • Fig.2 is a diagram illustrating that a UE capable of handover between WWAN and WLAN performs end-to-end communication with another UE via Internet.
  • UEl with two radio interfaces WWAN and WLAN can establish communication with another UE2 through accessing GPRS network and via Internet, or accessing WLAN adopting IEEE 802.11 communication standard for example and then via Internet. Assuming that UEl is outside the WLAN coverage at the very beginning of the communication, UEl establishes communication connection with UE2 via the communication line formed by GPRS and Internet.
  • UEl generates QoS parameters on the application layer (termed as application layer QoS parameters hereafter).
  • the application layer QoS parameters are the QoS requirement for guaranteeing normal communication between UEl and UE2 and thus is also termed as end-to-end QoS parameters.
  • UEl maps the application layer QoS parameters to the network layer QoS parameters.
  • PDP Packet Data Protocol
  • PDF Packet Data Flow
  • UEl negotiates with GPRS for QoS parameters.
  • This procedure maps the QoS requirement reserved by the user, i.e. on network layer QoS requirement, to GPRS QoS parameters, so that the RRM (Radio Resource Management) and MAC (Media Access Control) functions of lower layer, e.g. RLC/MAC (Radio Link Control/ Media Access Control) can allocate resources according the GPRS QoS parameters.
  • RRM Radio Resource Management
  • MAC Media Access Control
  • a transmission segment of the above end-to-end communication line in GPRS is established between UEl and GGSN (GPRS Gateway Supporting Node) of GPRS.
  • SGSN Service Gateway Supporting Node
  • SGSN Service Gateway Supporting Node
  • GGSN is the gateway between GPRS and external PDN (Packet Data Network) such as Internet.
  • the IP-supported GGSN can perform protocol translation on GPRS packets and transmit the translated packets to Internet.
  • each intermediate node such as the nodes supporting RSVP (Resource
  • RSVP Reservation Protocol
  • IETF Internet Engineer Task Force
  • UE2 connected with Internet supports RSVP, it can map the Internet QoS parameters to the network layer QoS parameters, and further maps the network layer QoS parameters to the application layer QoS parameter, thus forming a complete end-to-end communication line.
  • UEl may negotiate with UE2 via Internet for the Internet QoS parameters, to provide the QoS guarantee of the transmission segments of Internet in the communication line during communication procedure.
  • transmission segments GPRS transmission segment and Internet transmission segment
  • UEl can establish communication with UE2 via Internet and satisfies the end-to-end QoS requirement.
  • WLAN signal strength is above a predefined value TLG PR S ⁇ W LA N
  • UEl continues communication with UE2 via WWAN and at the same time maps the network layer QoS parameters to WLAN QoS parameter, and negotiates with the WLAN via the WLAN interface for the QoS parameters.
  • the negotiated WLAN QoS parameters only involve the QoS parameters needed by the physical layer and medium access layer and these QoS parameters are different from those used on the network layer and application layer. If the WLAN adopts
  • UEl maps the network layer QoS parameters to
  • the WLAN can accept or reject the resource reservation request including the QoS parameters sent from UEl according to the current resource status. If the WLAN accepts UEl 's resource reservation request, UEl continues via WLAN interface to negotiate with UE2 for the QoS parameters for use in Internet after switching to WLAN.
  • UEl maps the network layer QoS parameters to the QoS parameters as defined in RSVP, and negotiates via WLAN interface with UE2 for the Internet QoS parameters. After switching to communicate in WLAN, the value of the
  • QoS parameters determined through negotiation can replace that of the Internet QoS parameters when communicating via WWAN, if required.
  • UE2 can map the Internet QoS parameters in accordance with RSVP to the network layer QoS parameters, and map the translated network layer QoS parameters to the application layer QoS parameters.
  • UEl can negotiate via Internet with UE2 for the Internet QoS parameters, and form a complete end-to-end line with QoS guarantee between UEl and UE2.
  • UEl and UE2 determine the Internet QoS parameters through negotiation, all involved intermediate nodes supporting RSVP in Internet reserve the corresponding resources and sets the corresponding soft status according to the value of the QoS parameters determined through negotiation, preparing to provide services satisfying QoS when switching to communicate via WLAN.
  • UEl starts to perform handover operation, i.e. sends a handover request to the WLAN via WLAN interface. After obtaining the handover response message from the WLAN, UEl continues to communicate with UE2, using the resources reserved in WLAN and Internet respectively.
  • the end-to-end communication line between UEl and UE2 formed by WLAN and Internet can satisfy the QoS requirement.
  • UEl When UEl performing communication via WLAN interface leaves the WLAN coverage area, if UEl detects its WLAN interface is unavailable, for example, UEl detects its received WLAN signal strength is below a predefined value THJV LA N ⁇ GPRS , UEl maintains communication with UE2 via WLAN continuously and at the same time starts the QoS parameter negotiation procedure with GPRS.
  • UEl Similar to the above QoS negotiation procedure when switching from WWAN to WLAN, UEl first maps the network layer QoS parameters to GPRS QoS parameters, wherein these QoS parameters only involves those below the network layer such as the physical layer and medium access layer. Through PDP or PDF context activation procedure, UEl negotiates with GPRS for the QoS parameters according to the GPRS communication standard.
  • UEl After determining GPRS QoS parameters through negotiation, UEl keeps negotiating via Internet with UE2 for the QoS parameters to be used in Internet after switching to communicate via WWAN.
  • Internet adopting IntServ model is still taken as an example.
  • UEl After mapping the network layer QoS parameters to the QoS parameters as defined in RSVP, UEl sends a resource reservation request including the QoS parameters to Internet via GPRS.
  • the intermediate nodes in GPRS network doesn't support RSVP, so each intermediate node in GPRS will forward the resource reservation request as a normal traffic message.
  • the GGSN in GPRS supports RSVP (GGSN's supporting of RSVP can make the end-to-end line with QoS guarantee seamless)
  • the GGSN will record the soft status of the corresponding resource reservation and send the resource reservation request to Internet.
  • UE2 communicating with UEl via Internet maps the Internet QoS parameters to network layer QoS parameters and maps the translated network layer QoS parameters to the application layer QoS parameters. Via Internet, UE2 can negotiate with UEl for the QoS parameters for use in Internet according to the resource reservation request sent from UEl.
  • all involved intermediate nodes supporting RSVP will reserve the corresponding resource and set the corresponding soft status according to the value of the QoS parameters determined through negotiation.
  • the GGSN will also reserve the corresponding resources according to the resource reservation confirmation message from Internet, preparing to provide communication service satisfying the QoS requirement when switching to communicate via WWAN.
  • UEl When UEl detects that its received WLAN signal strength is below a predefined value TLWLAN ⁇ GPRS, where TLWLAN ⁇ GPRS ⁇ THWLAN ⁇ GPRS, that is, the WLAN signal strength has decreased to the handover threshold, UEl is assured of having left the WLAN area.
  • UEl starts to execute handover operation, i.e. sends a handover request to GPRS via WWAN interface. After acquiring the handover response message from GPRS, UEl continues to communicate with UE2 using the resources reserved in GPRS and Internet respectively.
  • the end-to-end communication line between UEl and UE2 formed by GPRS and Internet can satisfy the QoS requirement.
  • WLAN and that from WLAN to WWAN as provided in the present invention, in conjunction with the communication method for handover between WWAN and WLAN as disclosed in the above patent application with Serial No. IB 2004/051496, taking two communicating UEl and UE2 as example.
  • Fig.3 illustrates the procedure where UEl switches to continue communication with UE2 via WLAN interface through the line with QoS guarantee formed by WLAN and Internet when performing communication with UE2 via WWAN interface through the line with QoS guarantee formed by GPRS and Internet.
  • UEl generates the application layer QoS parameters according to different applications and maps the application layer QoS parameters to the network layer QoS parameters (step SlO).
  • the mapped network layer QoS parameters are end-to-end QoS parameters. Taking transmission rate, bit error rate and delay as example, the end-to-end QoS parameters indicate transmission rate Rateg ⁇ g, bit error rate BER ⁇ and delay Delay ⁇ .
  • UEl maps the network layer QoS parameters to GPRS QoS parameters (step S20), wherein these mapped QoS parameters only involve the QoS parameters on each layer (e.g. physical layer and medium access layer) below the network layer, still taking transmission rate Rate GP ass bit error rate BERGPRS and delay Delay GPRS as example.
  • layer e.g. physical layer and medium access layer
  • UEl sends to GPRS a resource reservation request including GPRS QoS parameters, so as to negotiate with GPRS for QoS parameters (step S30).
  • UEl maps the network layer QoS parameters to Internet QoS parameters according to the QoS mechanism adopted by Internet located behind the access network GPRS, taking the core protocol RSVP of IntServ model adopted by Internet as an example, wherein these mapped QoS parameters only involve the QoS parameters on each layer (e.g. physical layer and medium access layer) below the network layer, such as transmission rate Ra.tei nternet , bit error rate BER Intemet and delay Delay /nter ⁇ e/ (step S40).
  • layers e.g. physical layer and medium access layer
  • UEl sends a resource reservation request including the Internet QoS parameters to Internet via GPRS, so as to negotiate with UE2 for the QoS parameters (step S50).
  • RaXei nternet , BERi ntemet and Delay i nternet all involved intermediate nodes supporting RSVP in Internet also reserve the corresponding resource and set the corresponding soft status according to the Internet QoS parameters (step S60).
  • UEl communicates with UE2 via the communication line formed by GPRS and Internet (step S70), wherein both GPRS and Internet QoS parameters should satisfy the requirement for end-to-end QoS parameters, that is, the transmission rates Rate GPA s and Rateintemet of GPRS and Internet both should be not less than Rate ⁇ iE, the BERs BERGPAS and BERi n ter n et of GPRS and Internet should both be not more than EER E2E , and the delays Delay GPRS and Delay i ntern et of GPRS and Internet should both be not more than Delayer-
  • UEl When UEl enters WLAN coverage area and detects that its WLAN interface is available, for example, the detected WLAN signal strength exceeds threshold ⁇ L GPRS ⁇ WLAN (step S80), UEl maps the network layer QoS parameters to WLAN QoS parameters meeting the communication standard according to the communication standard adopted by
  • WLAN still taking IEEE 802.11 as an example, wherein in the same manner these mapped QoS parameters only involve the QoS parameters on each layer (e.g. physical layer and medium access layer) below the network layer, such as transmission rate RdXtwiAN, bit error rate B ⁇ RWL ⁇ N and delay (step S90).
  • UEl sends a resource reservation request including the WLAN QoS parameters to WLAN via the WLAN interface, so as to negotiate with WLAN for QoS parameters (step SlOO).
  • UEl After obtaining the WLAN QoS parameters (like Rate ⁇ LAN , according to the resource reservation response message for WLAN, UEl maps the network layer QoS parameters to Internet QoS parameters, such as transmission rate Rate/ Bternef , bit error rate BER/ Bto7 , e , and delay Delayi ntemet , according to the RSVP QoS mechanism adopted by Internet located behind the access network WLAN (step SIlO). Further, UEl sends a resource reservation request including the Internet QoS parameters to Internet via WLAN interface, so as to negotiate with UE2 for the value of the Internet QoS parameters (step S 120).
  • Internet QoS parameters such as transmission rate Rate/ Bternef , bit error rate BER/ Bto7 , e , and delay Delayi ntemet , according to the RSVP QoS mechanism adopted by Internet located behind the access network WLAN (step SIlO). Further, UEl sends a resource reservation request including the Internet QoS parameters to Internet via WLAN interface, so as
  • the value of the QoS parameters determined through negotiation can replace the value of the Internet QoS parameters when communicating via WWAN, as required.
  • all involved intermediate nodes supporting RSVP will generate resource reservation request and record the soft status of the corresponding resource reservation.
  • UEl acquires the Internet QoS parameters such as RaXcinternet, BER/ nterne( and Delay internet', all involved intermediate nodes supporting RSVP in Internet also reserve the corresponding resource and set the corresponding soft status according to the Internet QoS parameters (step S 130).
  • UEl After determining the WLAN and Internet QoS parameters (both WLAN and Internet QoS parameters should satisfy the end-to-end parameter requirement) through negotiation, when UEl detects that its received WLAN signal strength exceeds the above handover threshold TRQ PRS ⁇ W LA N, UEl starts to execute handover operations, that is, sends a handover request to the WLAN (step S 140).
  • UEl After acquiring the WLAN's handover response message (step S 150), UEl sends a handover notification message to GPRS to inform GPRS that it has switched to WLAN (step S160). Upon receipt of the handover notification message, GPRS releases the resources reserved for UEl and sends a handover confirmation message to UEl (step S170).
  • Receipt of the handover confirmation message indicates that UEl has completed the handover procedure from WWAN to WLAN.
  • UEl continues to communicate with UE2 via WLAN interface, by using the resources reserved in WLAN and Internet respectively (step S180).
  • Fig.4 illustrates the procedure where UEl switches back to GPRS when leaving the WLAN coverage area and continues communication with UE2 via WWAN through the QoS guarantee line formed by GPRS and Internet.
  • UEl maps the network layer QoS parameters to GPRS QoS parameters, wherein these mapped QoS parameters only involve the QoS parameters on each layer (e.g. physical layer and medium access layer) below the network layer, such as transmission rate Rate G r ⁇ s, bit error rate BERcms and delay Delay GPRS (step S220).
  • GPRS QoS parameters e.g. physical layer and medium access layer
  • UEl uses PDP context activation procedure to negotiate with GPRS via WWAN interface, to negotiate with
  • UEl maps the network layer QoS parameters to Internet QoS parameters, such as transmission rate Rate/ nterne( , bit error rate BER /Mterae/ and delay Delay /ntera ⁇ , according to the RSVP QoS mechanism adopted by Internet located behind the access network GPRS (step S240).
  • UEl sends a resource reservation request including the Internet QoS parameters to Internet via WWAN interface, so as to negotiate with UE2 for the value of the Internet QoS parameters (step S250).
  • the value of the QoS parameters determined through negotiation can replace the value of the
  • UEl After determining the GPRS and Internet QoS parameters (both GPRS and Internet QoS parameters should satisfy the end-to-end parameter requirement) through negotiation, when UEl detects that its received WLAN signal strength is below the above handover threshold TL W LA N - GPRS , UEl starts to execute handover operations, that is, sends a handover request to the GPRS (step S270). After acquiring the GPRS's handover response message (step S280), UEl sends a handover notification message to WLAN to inform WLAN that it has switched to GPRS (step S290).
  • WLAN Upon receipt of the handover notification message, WLAN releases the resources reserved for UEl and sends a handover confirmation message to UEl (step S300).
  • Receipt of the handover confirmation message indicates that UEl has completed the handover procedure from WLAN to WWAN.
  • UEl continues to communicate with UE2 via WWAN interface, by using the resources reserved in GPRS and Internet respectively (step S310).
  • the handover procedure executed by UEl is similar to the case where it's connected to Internet directly via WLAN, except that the GPRS QoS parameters via the communication line formed by WLAN, GPRS and Internet are to be negotiated according to the actual conditions of the communication when switching to WLAN, in addition to the above negotiated WLAN and Internet QoS parameters.
  • PDP context activation procedure can still be adopted in negotiating GPRS QoS parameters.
  • intermediate networks can be included in the communication line between UEl and UE2.
  • UEl can transmit traffic information with UE2 via the intermediate networks during communication procedure.
  • Fig.5 illustrates a UE according to an embodiment of the present invention, wherein the UE can perform the proposed method for providing end-to-end QoS guarantee during handover between WWAN and WLAN.
  • components same as or similar to those in conventional UEs are not shown.
  • the UE at least comprises the following modules: (1) determining unit 10, the determining unit 10 should be able to determine the types of multiple communication networks adopting different communication standards between the UE and the other party of the communication;
  • the partitioning unit 20 can partition the end-to-end QoS parameter into QoS parameters of multiple transmission segments according to the types of the communication networks forming the communication line determined by determining unit 10, so that the end-to-end communication line formed by the multiple transmission segments can satisfy the QoS requirement if only the negotiated QoS parameters of each transmission segment can meet a certain QoS requirement.
  • mapping unit 30, the mapping unit 30 can translate different application into the application layer QoS parameters and map the application layer QoS parameters to the corresponding network layer QoS parameters, and map the network layer QoS parameters respectively to the QoS parameters of each communication network as well, according to the types of the communication networks in the communication line determined by determining unit 10.
  • the mapped QoS parameters only involve the QoS parameters on each layer (such as physical layer and medium access layer) below the network layer.
  • the mapping unit 30 maps the network layer QoS parameters to GPRS QoS parameters, Internet QoS parameters and WLAN QoS parameters respectively according to the communication standards adopted by GPRS, Internet and WLAN.
  • the negotiating unit 40 uses the QoS parameters generated by the mapping unit 30 to negotiate with the corresponding communication network for the QoS parameters to be used.
  • detecting unit 50 the detecting unit 50 detects the location of the UE within the
  • WLAN area according to the WLAN signal strength received by receiving unit 60 so as to start negotiating unit 40 to negotiate with the newly accessed communication network for the corresponding QoS parameters when the UE enters or leaves WLAN and start handover operations to WLAN or WWAN when the detected signal strength reaches a certain threshold.
  • WLAN and Internet as an example, descriptions are given to the procedure where UEl and UE2 communicate via the communication line, wherein WLAN can be the wireless network adopting IEEE 802.11 communication standard as stated in the embodiment of the present invention or the wireless network adopting HyperLan2 communication standard, the wire PDN can be Internet as stated in the embodiment of the present invention or those adopting other communication standards such as ATM network.
  • UEl maps the network layer QoS parameters to the QoS parameters of the corresponding communication network and negotiates with each communication network for the QoS parameters so as to meet the QoS requirement of the whole communication line based on guaranteeing that each segment of communication network can satisfy its respective QoS requirement.
  • the UE can partition the end-to-end QoS parameters into the corresponding QoS parameters of each communication network according to the types of the communication networks on the communication line, and negotiate with each communication network for the corresponding QoS parameters respectively, the end-to-end communication line can meet the QoS requirement when communications are performed via the communication line because the negotiated QoS of each segment can satisfy its respective QoS requirement.
  • the UE can partition the end-to-end QoS parameters into QoS parameters of several network segments corresponding to their types and negotiate with each network for the QoS parameters, and then communicate using the corresponding QoS parameters of each network determined through negotiation.
  • the UE can partition the end-to-end QoS parameters into QoS parameters of several network segments corresponding to their types and negotiate with each network for the QoS parameters, and then communicate using the corresponding QoS parameters of each network determined through negotiation.
  • handover is performed in two steps, that is, starting to negotiate with the communication network to be switched for the QoS parameters and starting handover operations when the handover threshold is reached. Consequently, with the handover method provided in the present invention, frequent handovers between WWAN and WLAN can be avoided, thus the system control load can be reduced and the possibility that system control overload causes communication interruption decreases.

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

Abstract

La présente invention a trait à un procédé pour garantir la qualité de service de bout en bout, comprenant: la détermination de types de la pluralité de réseaux de communication à travers lesquels passe la communication de bout en bout, les types de réseaux de communication étant basés sur les normes de communication adoptées par les réseaux de communication; la négociation avec chaque réseau de communication pour les paramètres de qualité de service pour chaque réseau de communication selon les types de la pluralité de réseaux de communication; l'établissement d'une communication de bout en bout à l'aide des paramètres négociés pour chaque réseau de communication.
PCT/IB2005/054038 2004-12-13 2005-12-05 Procede et appareil pour garantir la qualite de service lors d'un transfert intercellulaire WO2006064390A2 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001028160A2 (fr) * 1999-10-14 2001-04-19 Nortel Networks Limited Etablissement d'une session de communications presentant une qualite de service dans un systeme de communications
WO2001031963A1 (fr) * 1999-10-29 2001-05-03 Telefonaktiebolaget L M Ericsson (Publ) Transfert de terminal mobile d'un reseau de deuxieme generation vers un reseau ip de troisieme generation
EP1392077A1 (fr) * 2002-08-21 2004-02-25 Thomson Licensing S.A. Gestion de la Qualité de Service (QoS) lors d'un transfert entre un réseau local sans fil (WLAN) et un réseau de téléphonie mobile
WO2004034592A2 (fr) * 2002-10-08 2004-04-22 Interdigital Technology Corporation Mise en correspondance de la qualite de service entre divers types de systemes de communication sans fil
EP1435748A1 (fr) * 2002-12-30 2004-07-07 France Telecom Sa Transfert entre réseaux mobiles de technologies différentes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001028160A2 (fr) * 1999-10-14 2001-04-19 Nortel Networks Limited Etablissement d'une session de communications presentant une qualite de service dans un systeme de communications
WO2001031963A1 (fr) * 1999-10-29 2001-05-03 Telefonaktiebolaget L M Ericsson (Publ) Transfert de terminal mobile d'un reseau de deuxieme generation vers un reseau ip de troisieme generation
EP1392077A1 (fr) * 2002-08-21 2004-02-25 Thomson Licensing S.A. Gestion de la Qualité de Service (QoS) lors d'un transfert entre un réseau local sans fil (WLAN) et un réseau de téléphonie mobile
WO2004034592A2 (fr) * 2002-10-08 2004-04-22 Interdigital Technology Corporation Mise en correspondance de la qualite de service entre divers types de systemes de communication sans fil
EP1435748A1 (fr) * 2002-12-30 2004-07-07 France Telecom Sa Transfert entre réseaux mobiles de technologies différentes

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