WO2017042626A1 - Method and apparatus for providing services to a remote ue - Google Patents

Method and apparatus for providing services to a remote ue Download PDF

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Publication number
WO2017042626A1
WO2017042626A1 PCT/IB2016/001355 IB2016001355W WO2017042626A1 WO 2017042626 A1 WO2017042626 A1 WO 2017042626A1 IB 2016001355 W IB2016001355 W IB 2016001355W WO 2017042626 A1 WO2017042626 A1 WO 2017042626A1
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WO
WIPO (PCT)
Prior art keywords
remote
relay
information
service
configuration information
Prior art date
Application number
PCT/IB2016/001355
Other languages
French (fr)
Inventor
Zhi Wang
Yigang Cai
Original Assignee
Alcatel Lucent
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 Alcatel Lucent filed Critical Alcatel Lucent
Publication of WO2017042626A1 publication Critical patent/WO2017042626A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • 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
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates to the field of communication technologies, and more specifically to a D2D communication technology.
  • a D2D (Device-to-Device) communication is a novel technology enabling terminals to directly communicate by multiplexing cell resources under control of a system, which can enhance spectrum efficiency of the cellular communication system and lower terminal transmit power, and solve the problem of shortage of wireless communication system spectrum resources to a certain extent.
  • a relay UE provides a connection to an operator's network for a remote UE.
  • the relay UE relays traffic between the remote UE and the network.
  • the remote UE herein refers to a UE that is not served by the E-UTRAN (Evolved Universal Terrestrial Radio Access Network) or a UE connected to the operator's network to enjoy network services via the relay UE.
  • the relay UE herein is also referred to as a UE-to-Network Relay UE.
  • the remote UE after accessing to the network via the relay UE, will use various services in the network. These services constitute a service chain.
  • these services constitute a service chain.
  • no solution can provide these services dynamically and intelligently for the remote UE, i.e., not specifying how the remote UE uses these services. Therefore, it becomes an imminent problem to be resolved as to how to provide an appropriate route or service chain for the remote UE.
  • An objective of the present invention is to provide a method and apparatus for providing services to a remote UE in a D2D relay.
  • a method for providing services to a remote UE in a PCRF the said remote UE communicating with a relay UE via D2D and accessing to an operator's network via the said relay UE, the method comprising steps of: A. in response to an IP-CAN session-establish request from the said remote UE or the said relay UE, transmitting a first information request to an SPR, wherein the said first information request includes a D2D relay identification which is used for identifying a correspondence relationship between the said remote UE and the said relay UE; B. receiving a first information response from the said SPR, wherein the first information response includes service configuration information of the said remote UE; C.
  • the method further comprises: if it is determined to inquire a third-party application, transmitting a second information request to the said third-party application; receiving a second information response from the said third-party application, wherein the said second information response includes relevant information related to services provided by the said third-party application; the step C further comprises: generating a service chain policy of the said remote UE based on the service configuration information of the said remote UE and the relevant information related to the services provided by the said third-party application.
  • the method further comprises: changing the service chain policy of the said remote UE based on a monitoring result from monitoring a network environment or data flow; and notifying the PCEF of the changed service chain policy of the said remote UE.
  • the method further comprises: changing the service chain policy of the said remote UE based on an indication message from the said third-party application, the said indication message includes updated relevant information related to the services provided by the said third-party application; notifying the said PCEF of the changed service chain policy of the said remote UE.
  • a method for providing services to a remote UE in an SPR the said remote UE communicating with a relay UE via D2D and accessing to a network via the said relay UE, the method comprising steps of: receiving a first information request from a PCRF, wherein the first information request includes a D2D relay identifier that is used for identifying a correspondence relationship between the said remote UE and the said relay UE; transmitting a first information response to the said PCRF, wherein the first information response includes service configuration information of the said remote UE.
  • the service configuration information of the said remote UE is preset and includes at least one rule, wherein each rule specifies a condition and a set of services used by the said remote UE corresponding to the condition.
  • service configuration information of the said remote UE will act as service configuration information of the said remote UE: default service configuration information; service configuration information of the said relay UE; service configuration information of the said remote UE obtained from the home network of the said remote UE.
  • an apparatus for providing services to a remote UE in PCRF the said remote UE communicating with a relay UE via D2D and accessing to an operator's network via the said relay UE
  • the apparatus comprising: a first transmitting device configured to, in response to an IP-CAN session establish request from the said remote UE or the said relay UE, transmit a first information request to an SPR, wherein the said first information request includes a D2D relay identification which is used for identifying a correspondence relationship between the said remote UE and the said relay UE; a first receiving device configured to receive a first information response from the said SPR, wherein the first information response includes service configuration information of the said remote UE; a policy generating device configured to generate a service chain policy of the said remote UE based on the service configuration information of the said remote UE, the service chain policy indicating network services used by the remote UE, use conditions, and use sequence; a second transmitting device configured to transmit an IP-CAN session establish request
  • the apparatus further comprises: a third transmitting device configured to, if it is determined to inquire a third-party application, transmit a second information request to the said third-party; a second receiving device configured to receive a second information response from the said third-party application, wherein the said second information response includes relevant information related to services provided by the said third-party application; the policy generating device is further configured to: generate a service chain policy of the said remote UE based on the service configuration information of the said remote UE and the relevant information related to the services provided by the said third-party application.
  • the apparatus further comprises: a first changing device configured to change the service chain policy of the said remote UE based on a monitoring result from monitoring a network environment or data flow; and a first notifying device configured to notify the PCEF of the changed service chain policy of the said remote UE.
  • a first changing device configured to change the service chain policy of the said remote UE based on a monitoring result from monitoring a network environment or data flow
  • a first notifying device configured to notify the PCEF of the changed service chain policy of the said remote UE.
  • the apparatus further comprises: a second changing device configured to change the service chain policy of the said remote UE based on an indication message from the said third-party application, the said indication message includes updated relevant information related to the services provided by the said third-party application; a second notifying device configured to notify the said PCEF of the changed service chain policy of the said remote UE.
  • a second changing device configured to change the service chain policy of the said remote UE based on an indication message from the said third-party application, the said indication message includes updated relevant information related to the services provided by the said third-party application
  • a second notifying device configured to notify the said PCEF of the changed service chain policy of the said remote UE.
  • an apparatus for providing services to a remote UE in an SP the said remote UE communicating with a relay UE via D2D and accessing to a network via the said relay UE, the apparatus comprising: a third receiving device configured to receive a first information request from a PCRF, wherein the first information request includes a D2D relay identifier that is used for identifying a correspondence relationship between the said remote UE and the said relay UE; a fourth transmitting device configured to transmit a first information response to the said PCRF, wherein the first information response includes service configuration information of the said remote UE.
  • the service configuration information of the said remote UE is preset and includes at least one rule, wherein each rule specifies a condition and a set of services used by the said remote UE corresponding to the condition.
  • service configuration information of the said remote UE Preferably, if the said remote UE and the said SP do not belong to a same operator one of the following will act as service configuration information of the said remote UE: default service configuration information; service configuration information of the said relay UE; service configuration information of the said remote UE obtained from the home network of the said remote UE.
  • the present invention makes a detailed specification on how the remote UE uses network services and how the operator's network provides services for the remote UE, which fills in a blank in the existing D2D relay technology.
  • the service chain policy may be updated in real time based on various conditions, such that the remote UE can use network services dynamically, intelligently, and reasonably.
  • the present invention is not only applicable to 3GPP-defined wireless access technologies, but also applicable to non-3 GPP-defined wireless access technologies.
  • Fig. 1 shows an application scenario diagram of one embodiment of the present invention
  • Fig. 2 shows a schematic diagram of a process of providing services to a remote UE according to one embodiment of the present invention
  • Fig. 3 shows a schematic diagram of an apparatus for providing services to a remote UE in PCRF according to one embodiment of the present invention
  • Fig. 4 shows a schematic diagram of an apparatus for providing services to a remote UE in SPR according to one embodiment of the present invention
  • Fig, 1 shows an application scenario diagram according to one embodiment of the present invention.
  • the remote UE 101 is not within the scope of E-UTRAN, but accessed to an operator's network via a relay UE 102.
  • a D2D communication is employed between the remote UE101 and the relay UE 102.
  • This relay manner is referred to as D2D relay.
  • the access manner employed by the relay UE in this embodiment is 3GPP-defined E-UTRAN, the present invention is likewise applicable to non-3 GPP-defined other access manners (e.g., WiFi) or future possibly emerging access manner.
  • the relay UE 102 is accessed to the IP service area of the operator via the eNB (evolved NodeB) 103, an MME (Mobility Management Entity) 104, and a PCEF (Policy and Charging Enforcement Function 105), the IP service area of the operator including various IP services provided by the operator. Meanwhile, the operator's network is connected to the Internet network. In this way, the remote UE 101 may enjoy various third-party applications in the Internet network via the relay UE102. What is exemplarily shown in the figure is a third-party application 108.
  • SPR (Subscription Profile Repository) 107 is preset with a service configuration file of a remote UE.
  • the service configuration file here is for setting the services used by the remote UE, which consists of at least one rule, wherein each rule indicates one condition and a set of services used by the remote UE under the condition.
  • Table 1 exemplarily shows the contents of a service configuration file:
  • condition may be a combination of various items of information below:
  • the SPR107 may use one of the following items as the service configuration information of the remote UEl O l :
  • the default service configuration information here refers to the default service configuration information set by the system for the remote UE in the D2D relay.
  • PCRF Policy and Charging Rule Function
  • the PCRF 106 formulates a service chain policy for the remote UE lO l , the service chain policy specifying network services used by the remote UE 101 , use conditions, and use sequence.
  • the network services here may not only comprise the operator's IP services, but also may comprise a third-party application.
  • the PCRF 106 notifies the PCEF 105 of the formulated service chain policy, such that the PCEF 105 executes the service chain policy, i.e., controlling route for the remote UEl O l to access the network based on the service chain policy.
  • the remote UE lO l accesses network nodes corresponding to various services according to a sequence specified in the service chain policy.
  • the PCRF 106 also monitors the network conditions in real time and changes the service chain policy of the remote UElOl if a trigger condition is met, and notifies the PCEF 105 of the updated service chain policy, such that the PCEF 105 executes the new policy.
  • Fig. 2 shows a schematic diagram of a process of providing services to a remote UE according to one embodiment of the present invention.
  • step S201 The process starts from step S201.
  • step S201 the remote UEl Ol or the relay UE 102 initiates a PDN (Public Data Network) connection process for the D2D relay, i.e., initiating a PDN connectivity request.
  • this request includes a D2D relay identification Relay 1 , the D2D relay identification Relay 1 is used for identifying a correspondence relationship between the remote UElO l and the relay UE 102.
  • step S202 like the prior art, the PCEF 105 will receive a request for creating a session, as the Create Session Request shown in the figure.
  • this Create Session Request includes the D2D relay identification Relay 1.
  • step S203 the PCEF 105 transmits an IP-CAN (IP-Connectivity Access Network) session establish request to the PCRF 106, as the IP-CAN Session Establish Request shown in the figure.
  • the PCRF 106 derives that the request is initiated by a D2D relay based on the D2D relay identification, and the D2D relay corresponds to the remote UElO l and the relay 102.
  • step S204 the PCRF 106 transmits a first information request to the SPR107, as the Profile Request shown in the figure.
  • the first information request includes the D2D relay identification Relay 1.
  • step S205 the PCRF 106 receives a first information response from the SPR 107, as the Profile Response shown in the figure.
  • the first information response includes the service configuration information of the remote UE lO l .
  • the service configuration information of the remote UEl O l obtained by the PCRF 106 from the PSR 107 is shown in table 2:
  • the relay UE is Information security service (priority not credible level 1);
  • the relay UE102 is not a user of the remote UE I OI . Therefore, the relay UE 102 is not credible.
  • the PCRF 106 determines, for the remote UEI OI , that it is applicable to the second rule in Table 2, wherein the information security service is the IP services provided by the operator. Its priority level is 1 (i.e., highest priority), which indicates that the information security service is essential and it would be used the earliest. Based on this rule, the PCRF 106 needs to inquire the third-party application 108 to obtain more service information.
  • step S206 the PCRF 106 transmits a second information request to the third-party application 108, as the D2D Relay Service Query Request shown in the figure, to obtain the services provided by the third-party application 108 and the relevant service parameter.
  • the D2D Relay Service Query Request message newly introduced in the present invention includes an identification of the remote UE IO I , an identification of the relay UE102, and connectivity information.
  • the connectivity information herein refers to the information of the data flow, which may be 3GPP-defined Flow-Description AVP (Attribute Value Pair).
  • the PCRF 106 receives a second information response transmitted from the third-party application 108, as D2D Relay Service Query Response shown in the figure.
  • the second information response includes relevant information related to the services provided by the third-party application 108.
  • Such information which included in the D2D Relay Service Query Response message newly introduced in the present invention, may be a list of services provided by the third-party application 108 (i.e., a set of services provided by the third-party application 108 that are available to the remote UE 101) and parameters related to these services. These services may be, for example, a greater bandwidth, a video buffer, a video flow optimization, etc.
  • the parameters related to these services may be priority of each service, which is used for indicating the sequence of service arrangement when the PCRF 106 generates the service chain policy; or the condition of using services, which is used for indicating under what condition the service is available; these conditions may be time, location, available data traffic of the user, existing bandwidth of the user, user balance, etc.
  • the second information response includes the video stream optimization services provided by the third-party application 108 and relevant parameters.
  • step S208 the PCRF 106 generates a service chain policy of the remote UE101 based on the service configuration information from the SPR 107 and the relevant information of the services provided by the third-party application 108.
  • the service chain policy generated by the PCRF 106 for the remote UE101 is specified as below:
  • Default information security service.
  • Data flow is between the remote UElOl and the third-party application 108: information security service, video stream optimization service.
  • the service chain policy actually also indicates the route of the network that the remote UElO l accessed.
  • step S206 and step S207 are not essential. If the service configuration information of the remote UE lO l does not include the indication of inquiring the third-party application, it would be unnecessary to inquire the third-party application.
  • the PCRF 106 generates the service chain policy of the remote UElO l based on the service configuration information from the SPR107.
  • the PCRF 106 After the PCRF 106 generates the service chain policy of the remote UE l Ol , in step S209, the PCRF 106 transmits an IP-CAN session establishment request response to the PCEF 105, as the IP-CAN Session Establish Response shown in the figure, the IP-CAN session establishment request response includes the service chain policy generated by the remote UElO l .
  • the PCEF 105 will implement the policy afterwards, i.e., controlling route of the data stream from the remote UE lO l based on the policy.
  • Steps S210 and S211 are identical to the prior art.
  • the PCEF 105 transmits a Create Session Request Response to the MME 104, as the Create Session Response shown in the figure; then the PDN connection establishment is completed.
  • the remote UE lO l accesses the network and routes based on the generated service chain policy.
  • the PCRF 106 further real-time monitors the network environment or data stream from the remote UE lO l , and in conjunction with the service configuration information of the remote UE l Ol , once a monitoring result will trigger change of the service chain policy, changes the service chain policy of the remote UE lO l, and then notifies the PCEF 105 of the changed service chain policy of the remote UE l Ol ; the PCEF 105 will implement the changed policy.
  • the PCRF 106 receives an indication message, from the third-party application 108, including updated relevant information related to the services provided by the third-party application 108.
  • the PCRF 106 changes the service chain policy of the remote UE lO l based on such updated information, and then notifies the PCEF 105 of the changed service chain policy of the remote UElO l .
  • the PCEF 105 will implement the changed policy.
  • Fig. 3 shows a schematic diagram of an apparatus for providing services to the remote UEl Ol in the PCRF 106 according to one embodiment of the present invention.
  • the apparatus 300 comprises: a first transmitting device 301 , a first receiving device 302, a policy generating device 303, and a second transmitting device 304.
  • the remote UE lO l or relay UE102 initiates a PDN connection process for the D2D relay, i.e., initiating a PDN connectivity request.
  • this request includes D2D relay identification Relay 1.
  • the D2D relay identification Relay 1 is used for identifying the correspondence relationship between the remote UElO l and the relay UE 102.
  • the PCRF 106 receives the IP-CAN session establish request, as the IP-CAN Session Establish Request shown in Fig. 2.
  • the IP-CAN session establish request includes the D2D relay identification Relay 1 mentioned above.
  • the PCRF 106 obtains, based on the D2D relay identification, that the request is initiated by one D2D relay, and what the D2D relay corresponds to are the remote UEI O I and the relay UE102.
  • the first transmitting device 301 transmits a first information request to the SPR107 in response to the IP-CAN session establish request, as the Profile Request shown in Fig. 2.
  • the first information request includes the D2D relay identification Relay 1.
  • the first receiving device 302 receives a first information response from the SPR107, as the Profile Response shown in Fig. 2.
  • the first information response includes the service configuration information of the remote UEI O I .
  • the policy generating device 303 generates a service chain policy of the remote UE IOI based on the service configuration information from the SPR 107.
  • the second transmitting device 304 transmits an IP-CAN session establish request response to the PCEF 105, as the IP-CAN Session Establish Response shown in Fig. 2.
  • the IP-CAN session establish request response includes the above generated service chain policy of the remote UEIO I .
  • the PCEF 105 implements the policy afterwards, i.e., controlling route of the data flow from the remote UEIO I based on the policy.
  • the apparatus 300 further comprises a third transmitting device (not shown in the figure) and a second receiving device (not shown in the figure).
  • the third transmitting device transmits a second information request to the third-party application 108, as the D2D Relay Service Query Request shown in Fig. 2, for obtaining the services provided by the third-party application 108 and relevant service parameters.
  • the D2D Relay Service Query Request newly introduced in the present invention contains an identification of the remote UE101 , the identification of the relay UE102, and the connectivity information.
  • the connectivity information herein refers to information regarding the data flow, which may be 3GPP-defmed Flow-Description AVP (Attribute Value Pair).
  • the second receiving device receives the second information response transmitted from the third-party application 108, as the D2D Relay Service Query Response shown in Fig. 2.
  • the second information response includes relevant information related to the services provided by the third-party application 108.
  • the information included in the newly introduced D2D Relay Service Query Response message in the present invention may be a list of services provided by the third-party application 108 (i.e., a set of services provided by the third-party application 108 that is available by the remote 101) and parameters related to these services. These services, for example, may be: a greater bandwidth, a video buffer, a video stream optimization, etc.
  • the service-related parameters may be the priority of each service, which is used for indicating the sequence of service arrangement when the PCRF 106 generates the service chain policy; or the conditions of using a service, which is used for indicating under what conditions the service is available, these conditions may be time, location, data traffic already used by the user, existing bandwidth of the user, user balance, etc.
  • the policy generating device 303 is further used for generating a service chain policy of the remote UE 101 based on the service configuration information from the SPR 107 and the relevant information related to the services provided by the third-party application 108.
  • the apparatus 300 further comprises a first changing device (not shown in the figure) and a first notifying device (not shown in the figure).
  • the PCRF also real-time monitors the network environment or the data flow from the remote UE101, in conjunction with the service configuration information of the remote UE101. Once the monitoring result will trigger change of the service chain policy, the first changing device will change the service chain policy of the remote UE101. Then, the first notifying device notifies the PCEF 105 of the changed service chain policy of the remote UE101 ; the PCEF 105 will implement the changed policy.
  • the apparatus 300 further comprises a second changing device (not shown in the figure) and a second notifying device (not shown in the figure).
  • the PCRF 106 receives an indication message from the third-party application 108, including updated relevant information related to the services provided by the third-party application 108.
  • the second changing device changes the service chain policy of the remote UE101 based on such updated information.
  • the second notifying device notifies the PCEF 105 of the changed service chain policy of the remote UE 101 , and the PCEF 105 will implement the changed policy.
  • Fig. 4 shows a schematic diagram of an apparatus for providing services to a remote UE in SPR according to one embodiment of the present invention.
  • the apparatus 400 comprises: a third receiving device 401 and a fourth transmitting device 402.
  • the third receiving device 401 receives a first information request from the PCRF 106, as the Profile Request shown in Fig. 2.
  • the first information request includes a D2D relay identifier Relay 1 , the D2D relay identification is used for identifying a correspondence relationship between the remote UE 101 and the relay UE102.
  • the SPR107 will retrieve the locally saved service configuration information so as to obtain the service configuration information of the remote UE 101.
  • the fourth transmitting device 402 transmits a first information response to the PCRF106, as the Profile Response shown in Fig. 2.
  • the first information response includes the service configuration information of the remote UE 101.
  • the present disclosure may be implemented in software or a combination of software and hardware; for example, it may be implemented by a dedicated integrated circuit (ASIC), a general-purpose computer, or any other similar hardware device.
  • the software program of the present disclosure may be executed by a processor so as to implement the above steps or functions.
  • the software program of the present disclosure (including relevant data structure) may be stored in a computer readable recording medium, for example, a RAM memory, a magnetic or optical driver, or a floppy disk, and similar devices.
  • some steps of functions of the present disclosure may be implemented by hardware, for example, a circuit cooperating with the processor to execute various functions or steps.
  • a portion of the present disclosure may be applied as a computer program product, for example, a computer program instruction, which, when executed by the computer, may invoke or provide a method and/or technical solution according to the present disclosure through operations of the computer.
  • the program instruction invoking the method of the present disclosure may be stored in a fixed or mobile recording medium, and/or transmitted through broadcast or data flow in other signal bearer media, and/or stored in a working memory of a computer device which operates based on the program instruction.
  • an apparatus comprises a memory for storing a computer program instruction and a processor for executing the program instruction, wherein when the computer program instruction is executed by the processor, the apparatus is triggered to run the methods and/or technical solutions according to a plurality of embodiments of the present disclosure.

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Abstract

An objective of the present invention provides a method and apparatus for providing services to a remote UE. The PCRF requests the SPR for the service configuration information of the remote UE based on the IP-CAN session establish request from the remote UE or the relay UE; then, the PCRF generates a service chain policy for the remote UE based on the obtained service configuration information of the remote UE, the service chain policy indicating the network service used by the remote UE, use condition, and use sequence. The PCRF transmits the service chain policy to the PCEF, such that the PCEF implements the policy. The present invention fills in the blank of the existing technology, such that the remote UE can use the network service dynamically, flexibly, and reasonably.

Description

Method and Apparatus for Providing Services to a Remote UE
FIELD OF THE INVENTION
The present invention relates to the field of communication technologies, and more specifically to a D2D communication technology.
BACKGROUND TECHNOLOGY
A D2D (Device-to-Device) communication is a novel technology enabling terminals to directly communicate by multiplexing cell resources under control of a system, which can enhance spectrum efficiency of the cellular communication system and lower terminal transmit power, and solve the problem of shortage of wireless communication system spectrum resources to a certain extent.
Currently, there are many research tasks on D2D, one of which is D2D relay. In this technical solution, a relay UE provides a connection to an operator's network for a remote UE. The relay UE relays traffic between the remote UE and the network. According to the definition of 3 GPP, the remote UE herein refers to a UE that is not served by the E-UTRAN (Evolved Universal Terrestrial Radio Access Network) or a UE connected to the operator's network to enjoy network services via the relay UE. The relay UE herein is also referred to as a UE-to-Network Relay UE.
The remote UE, after accessing to the network via the relay UE, will use various services in the network. These services constitute a service chain. However, in the existing solutions regarding D2D relay, no solution can provide these services dynamically and intelligently for the remote UE, i.e., not specifying how the remote UE uses these services. Therefore, it becomes an imminent problem to be resolved as to how to provide an appropriate route or service chain for the remote UE. SUMMARY OF THE INVENTION
An objective of the present invention is to provide a method and apparatus for providing services to a remote UE in a D2D relay.
According to a first aspect of the present invention, there is provided a method for providing services to a remote UE in a PCRF, the said remote UE communicating with a relay UE via D2D and accessing to an operator's network via the said relay UE, the method comprising steps of: A. in response to an IP-CAN session-establish request from the said remote UE or the said relay UE, transmitting a first information request to an SPR, wherein the said first information request includes a D2D relay identification which is used for identifying a correspondence relationship between the said remote UE and the said relay UE; B. receiving a first information response from the said SPR, wherein the first information response includes service configuration information of the said remote UE; C. generating a service chain policy of the said remote UE based on the said service configuration information of the said remote UE, the said service chain policy indicating network services used by the remote UE, use conditions, and use sequence; D. transmitting an IP-CAN session-establish request response to the PCEF, wherein the said IP-CAN session-establish request response includes the said generated service chain policy of the said remote UE.
Preferably, after the step B and before the step C, the method further comprises: if it is determined to inquire a third-party application, transmitting a second information request to the said third-party application; receiving a second information response from the said third-party application, wherein the said second information response includes relevant information related to services provided by the said third-party application; the step C further comprises: generating a service chain policy of the said remote UE based on the service configuration information of the said remote UE and the relevant information related to the services provided by the said third-party application.
Preferably, the method further comprises: changing the service chain policy of the said remote UE based on a monitoring result from monitoring a network environment or data flow; and notifying the PCEF of the changed service chain policy of the said remote UE.
Preferably, the method further comprises: changing the service chain policy of the said remote UE based on an indication message from the said third-party application, the said indication message includes updated relevant information related to the services provided by the said third-party application; notifying the said PCEF of the changed service chain policy of the said remote UE.
According to a second aspect of the present invention, there is provided a method for providing services to a remote UE in an SPR, the said remote UE communicating with a relay UE via D2D and accessing to a network via the said relay UE, the method comprising steps of: receiving a first information request from a PCRF, wherein the first information request includes a D2D relay identifier that is used for identifying a correspondence relationship between the said remote UE and the said relay UE; transmitting a first information response to the said PCRF, wherein the first information response includes service configuration information of the said remote UE.
Preferably, the service configuration information of the said remote UE is preset and includes at least one rule, wherein each rule specifies a condition and a set of services used by the said remote UE corresponding to the condition.
Preferably, if the said remote UE and the said SPR do not belong to a same operator, one of the following will act as service configuration information of the said remote UE: default service configuration information; service configuration information of the said relay UE; service configuration information of the said remote UE obtained from the home network of the said remote UE.
According to a third aspect of the present invention, there is provided an apparatus for providing services to a remote UE in PCRF, the said remote UE communicating with a relay UE via D2D and accessing to an operator's network via the said relay UE, the apparatus comprising: a first transmitting device configured to, in response to an IP-CAN session establish request from the said remote UE or the said relay UE, transmit a first information request to an SPR, wherein the said first information request includes a D2D relay identification which is used for identifying a correspondence relationship between the said remote UE and the said relay UE; a first receiving device configured to receive a first information response from the said SPR, wherein the first information response includes service configuration information of the said remote UE; a policy generating device configured to generate a service chain policy of the said remote UE based on the service configuration information of the said remote UE, the service chain policy indicating network services used by the remote UE, use conditions, and use sequence; a second transmitting device configured to transmit an IP-CAN session establish request response to the PCEF, wherein the said IP-CAN session establishment request response includes the said generated service chain policy of the said remote UE.
Preferably, the apparatus further comprises: a third transmitting device configured to, if it is determined to inquire a third-party application, transmit a second information request to the said third-party; a second receiving device configured to receive a second information response from the said third-party application, wherein the said second information response includes relevant information related to services provided by the said third-party application; the policy generating device is further configured to: generate a service chain policy of the said remote UE based on the service configuration information of the said remote UE and the relevant information related to the services provided by the said third-party application.
Preferably, the apparatus further comprises: a first changing device configured to change the service chain policy of the said remote UE based on a monitoring result from monitoring a network environment or data flow; and a first notifying device configured to notify the PCEF of the changed service chain policy of the said remote UE.
Preferably, the apparatus further comprises: a second changing device configured to change the service chain policy of the said remote UE based on an indication message from the said third-party application, the said indication message includes updated relevant information related to the services provided by the said third-party application; a second notifying device configured to notify the said PCEF of the changed service chain policy of the said remote UE.
According to a fourth aspect of the present invention, there is provided an apparatus for providing services to a remote UE in an SP , the said remote UE communicating with a relay UE via D2D and accessing to a network via the said relay UE, the apparatus comprising: a third receiving device configured to receive a first information request from a PCRF, wherein the first information request includes a D2D relay identifier that is used for identifying a correspondence relationship between the said remote UE and the said relay UE; a fourth transmitting device configured to transmit a first information response to the said PCRF, wherein the first information response includes service configuration information of the said remote UE.
Preferably, the service configuration information of the said remote UE is preset and includes at least one rule, wherein each rule specifies a condition and a set of services used by the said remote UE corresponding to the condition.
Preferably, if the said remote UE and the said SP do not belong to a same operator one of the following will act as service configuration information of the said remote UE: default service configuration information; service configuration information of the said relay UE; service configuration information of the said remote UE obtained from the home network of the said remote UE.
Compared with the prior art, by formulating a service chain policy including various rules, the present invention makes a detailed specification on how the remote UE uses network services and how the operator's network provides services for the remote UE, which fills in a blank in the existing D2D relay technology. Moreover, the service chain policy may be updated in real time based on various conditions, such that the remote UE can use network services dynamically, intelligently, and reasonably. The present invention is not only applicable to 3GPP-defined wireless access technologies, but also applicable to non-3 GPP-defined wireless access technologies.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Through reading the detailed description of the non-limiting elements with reference to the accompanying drawings, other features, objects and advantages of the present invention will become more apparent:
Fig. 1 shows an application scenario diagram of one embodiment of the present invention;
Fig. 2 shows a schematic diagram of a process of providing services to a remote UE according to one embodiment of the present invention;
Fig. 3 shows a schematic diagram of an apparatus for providing services to a remote UE in PCRF according to one embodiment of the present invention;
Fig. 4 shows a schematic diagram of an apparatus for providing services to a remote UE in SPR according to one embodiment of the present invention;
In the accompanying drawings, same or like reference numerals represent same or like components.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
Fig, 1 shows an application scenario diagram according to one embodiment of the present invention.
In the present embodiment, the remote UE 101 is not within the scope of E-UTRAN, but accessed to an operator's network via a relay UE 102. A D2D communication is employed between the remote UE101 and the relay UE 102. This relay manner is referred to as D2D relay. It should be noted that although the access manner employed by the relay UE in this embodiment is 3GPP-defined E-UTRAN, the present invention is likewise applicable to non-3 GPP-defined other access manners (e.g., WiFi) or future possibly emerging access manner.
The relay UE 102 is accessed to the IP service area of the operator via the eNB (evolved NodeB) 103, an MME (Mobility Management Entity) 104, and a PCEF (Policy and Charging Enforcement Function 105), the IP service area of the operator including various IP services provided by the operator. Meanwhile, the operator's network is connected to the Internet network. In this way, the remote UE 101 may enjoy various third-party applications in the Internet network via the relay UE102. What is exemplarily shown in the figure is a third-party application 108.
SPR (Subscription Profile Repository) 107 is preset with a service configuration file of a remote UE. The service configuration file here is for setting the services used by the remote UE, which consists of at least one rule, wherein each rule indicates one condition and a set of services used by the remote UE under the condition. Table 1 exemplarily shows the contents of a service configuration file:
Figure imgf000009_0001
Table 1
Wherein the condition may be a combination of various items of information below:
- type of the remote UE or relay UE;
- prefix of the identification of the relay UE or scope of the identification of the relay UE;
- Prefix of the identification of the remote UE;
- APN (Access Point Number) information;
- Access technology type;
- Data flow identification;
- Application type;
- time;
- location;
- bandwidth;
- power level of UE;
- real-time situation of the network.
In one embodiment, if the remote UE 101 and SPR107 do not belong to the same operator, the SPR107 may use one of the following items as the service configuration information of the remote UEl O l :
- default service configuration information;
The default service configuration information here refers to the default service configuration information set by the system for the remote UE in the D2D relay.
- service configuration information of the relay UE;
- the service configuration information of the remote UE obtained from the home network of the remote UE.
PCRF (Policy and Charging Rule Function) 106 formulates a service chain policy for the remote UE lO l , the service chain policy specifying network services used by the remote UE 101 , use conditions, and use sequence. The network services here may not only comprise the operator's IP services, but also may comprise a third-party application. The PCRF 106 notifies the PCEF 105 of the formulated service chain policy, such that the PCEF 105 executes the service chain policy, i.e., controlling route for the remote UEl O l to access the network based on the service chain policy. Specifically, the remote UE lO l accesses network nodes corresponding to various services according to a sequence specified in the service chain policy.
The PCRF 106 also monitors the network conditions in real time and changes the service chain policy of the remote UElOl if a trigger condition is met, and notifies the PCEF 105 of the updated service chain policy, such that the PCEF 105 executes the new policy.
Fig. 2 shows a schematic diagram of a process of providing services to a remote UE according to one embodiment of the present invention.
The process starts from step S201.
In step S201 , the remote UEl Ol or the relay UE 102 initiates a PDN (Public Data Network) connection process for the D2D relay, i.e., initiating a PDN connectivity request. Different from the existing PDN connectivity requests, this request includes a D2D relay identification Relay 1 , the D2D relay identification Relay 1 is used for identifying a correspondence relationship between the remote UElO l and the relay UE 102.
In step S202, like the prior art, the PCEF 105 will receive a request for creating a session, as the Create Session Request shown in the figure. However, different from the prior art, this Create Session Request includes the D2D relay identification Relay 1.
Next, in step S203, the PCEF 105 transmits an IP-CAN (IP-Connectivity Access Network) session establish request to the PCRF 106, as the IP-CAN Session Establish Request shown in the figure. The PCRF 106 derives that the request is initiated by a D2D relay based on the D2D relay identification, and the D2D relay corresponds to the remote UElO l and the relay 102.
In step S204, the PCRF 106 transmits a first information request to the SPR107, as the Profile Request shown in the figure. The first information request includes the D2D relay identification Relay 1.
Next, in step S205, the PCRF 106 receives a first information response from the SPR 107, as the Profile Response shown in the figure. The first information response includes the service configuration information of the remote UE lO l .
In one embodiment, the service configuration information of the remote UEl O l obtained by the PCRF 106 from the PSR 107 is shown in table 2:
Condition Service
Default If the data flow is between the remote
UE 101 and the third-party application 108, inquiring the third-party
application 108 for more services
The relay UE is Information security service (priority not credible level 1);
If the data flow is between the remote
UEI O I and the third-party application
108, inquiring the third-party 108 for more services
Table 2
In this embodiment, the relay UE102 is not a user of the remote UE I OI . Therefore, the relay UE 102 is not credible. Based on the service configuration as shown in Table 2, the PCRF 106 determines, for the remote UEI OI , that it is applicable to the second rule in Table 2, wherein the information security service is the IP services provided by the operator. Its priority level is 1 (i.e., highest priority), which indicates that the information security service is essential and it would be used the earliest. Based on this rule, the PCRF 106 needs to inquire the third-party application 108 to obtain more service information.
Then, in step S206, the PCRF 106 transmits a second information request to the third-party application 108, as the D2D Relay Service Query Request shown in the figure, to obtain the services provided by the third-party application 108 and the relevant service parameter. It should be noted that the present invention needs to enhance the existing Rx interface between the PCRF and the third-party application. The D2D Relay Service Query Request message newly introduced in the present invention includes an identification of the remote UE IO I , an identification of the relay UE102, and connectivity information. The connectivity information herein refers to the information of the data flow, which may be 3GPP-defined Flow-Description AVP (Attribute Value Pair).
Then, in step S207, the PCRF 106 receives a second information response transmitted from the third-party application 108, as D2D Relay Service Query Response shown in the figure. The second information response includes relevant information related to the services provided by the third-party application 108. Such information, which included in the D2D Relay Service Query Response message newly introduced in the present invention, may be a list of services provided by the third-party application 108 (i.e., a set of services provided by the third-party application 108 that are available to the remote UE 101) and parameters related to these services. These services may be, for example, a greater bandwidth, a video buffer, a video flow optimization, etc. The parameters related to these services may be priority of each service, which is used for indicating the sequence of service arrangement when the PCRF 106 generates the service chain policy; or the condition of using services, which is used for indicating under what condition the service is available; these conditions may be time, location, available data traffic of the user, existing bandwidth of the user, user balance, etc. in this embodiment, the second information response includes the video stream optimization services provided by the third-party application 108 and relevant parameters.
In step S208, the PCRF 106 generates a service chain policy of the remote UE101 based on the service configuration information from the SPR 107 and the relevant information of the services provided by the third-party application 108.
In this embodiment, the service chain policy generated by the PCRF 106 for the remote UE101 is specified as below:
Default: information security service. Data flow is between the remote UElOl and the third-party application 108: information security service, video stream optimization service.
Based on the policy, for the data stream from the remote UE lO l, in the default case, it will use the information security service; if the data flow is between the remote UElO l and the third-party application 108, it will firstly use the information security service and then use the video stream optimization service. It may be seen that the service chain policy actually also indicates the route of the network that the remote UElO l accessed.
It should be noted that step S206 and step S207 are not essential. If the service configuration information of the remote UE lO l does not include the indication of inquiring the third-party application, it would be unnecessary to inquire the third-party application. In the next step S208, the PCRF 106 generates the service chain policy of the remote UElO l based on the service configuration information from the SPR107.
After the PCRF 106 generates the service chain policy of the remote UE l Ol , in step S209, the PCRF 106 transmits an IP-CAN session establishment request response to the PCEF 105, as the IP-CAN Session Establish Response shown in the figure, the IP-CAN session establishment request response includes the service chain policy generated by the remote UElO l . The PCEF 105 will implement the policy afterwards, i.e., controlling route of the data stream from the remote UE lO l based on the policy.
Subsequent Steps S210 and S211 are identical to the prior art. The PCEF 105 transmits a Create Session Request Response to the MME 104, as the Create Session Response shown in the figure; then the PDN connection establishment is completed.
Afterwards, the remote UE lO l accesses the network and routes based on the generated service chain policy.
In another embodiment, the PCRF 106 further real-time monitors the network environment or data stream from the remote UE lO l , and in conjunction with the service configuration information of the remote UE l Ol , once a monitoring result will trigger change of the service chain policy, changes the service chain policy of the remote UE lO l, and then notifies the PCEF 105 of the changed service chain policy of the remote UE l Ol ; the PCEF 105 will implement the changed policy.
In another embodiment, the PCRF 106 receives an indication message, from the third-party application 108, including updated relevant information related to the services provided by the third-party application 108. The PCRF 106 changes the service chain policy of the remote UE lO l based on such updated information, and then notifies the PCEF 105 of the changed service chain policy of the remote UElO l . The PCEF 105 will implement the changed policy.
Fig. 3 shows a schematic diagram of an apparatus for providing services to the remote UEl Ol in the PCRF 106 according to one embodiment of the present invention. The apparatus 300 comprises: a first transmitting device 301 , a first receiving device 302, a policy generating device 303, and a second transmitting device 304.
Hereinafter, the work process of the apparatus will be described with reference to Fig. 1 and Fig.2.
First, the remote UE lO l or relay UE102 initiates a PDN connection process for the D2D relay, i.e., initiating a PDN connectivity request. Different from the existing PDN connectivity request, this request includes D2D relay identification Relay 1. The D2D relay identification Relay 1 is used for identifying the correspondence relationship between the remote UElO l and the relay UE 102.
Next, the PCRF 106 receives the IP-CAN session establish request, as the IP-CAN Session Establish Request shown in Fig. 2. The IP-CAN session establish request includes the D2D relay identification Relay 1 mentioned above. The PCRF 106 obtains, based on the D2D relay identification, that the request is initiated by one D2D relay, and what the D2D relay corresponds to are the remote UEI O I and the relay UE102.
Afterwards, the first transmitting device 301 transmits a first information request to the SPR107 in response to the IP-CAN session establish request, as the Profile Request shown in Fig. 2. The first information request includes the D2D relay identification Relay 1.
Then, the first receiving device 302 receives a first information response from the SPR107, as the Profile Response shown in Fig. 2. The first information response includes the service configuration information of the remote UEI O I .
The policy generating device 303 generates a service chain policy of the remote UE IOI based on the service configuration information from the SPR 107.
After the policy generating device 303 generates the service chain policy of the remote UE IO I , the second transmitting device 304 transmits an IP-CAN session establish request response to the PCEF 105, as the IP-CAN Session Establish Response shown in Fig. 2. The IP-CAN session establish request response includes the above generated service chain policy of the remote UEIO I . The PCEF 105 implements the policy afterwards, i.e., controlling route of the data flow from the remote UEIO I based on the policy.
In a further embodiment, the apparatus 300 further comprises a third transmitting device (not shown in the figure) and a second receiving device (not shown in the figure).
If the PCRF 106 determines a need of inquiring the third-party application 108 based on the service configuration information from the SPR107, the third transmitting device transmits a second information request to the third-party application 108, as the D2D Relay Service Query Request shown in Fig. 2, for obtaining the services provided by the third-party application 108 and relevant service parameters. It should be noted that the present invention needs to enhance the current Rx interface between the PCRF and the third-party application. The D2D Relay Service Query Request newly introduced in the present invention contains an identification of the remote UE101 , the identification of the relay UE102, and the connectivity information. The connectivity information herein refers to information regarding the data flow, which may be 3GPP-defmed Flow-Description AVP (Attribute Value Pair).
Next, the second receiving device receives the second information response transmitted from the third-party application 108, as the D2D Relay Service Query Response shown in Fig. 2. The second information response includes relevant information related to the services provided by the third-party application 108. The information included in the newly introduced D2D Relay Service Query Response message in the present invention may be a list of services provided by the third-party application 108 (i.e., a set of services provided by the third-party application 108 that is available by the remote 101) and parameters related to these services. These services, for example, may be: a greater bandwidth, a video buffer, a video stream optimization, etc. The service-related parameters may be the priority of each service, which is used for indicating the sequence of service arrangement when the PCRF 106 generates the service chain policy; or the conditions of using a service, which is used for indicating under what conditions the service is available, these conditions may be time, location, data traffic already used by the user, existing bandwidth of the user, user balance, etc.
The policy generating device 303 is further used for generating a service chain policy of the remote UE 101 based on the service configuration information from the SPR 107 and the relevant information related to the services provided by the third-party application 108.
In a still further embodiment, the apparatus 300 further comprises a first changing device (not shown in the figure) and a first notifying device (not shown in the figure).
The PCRF also real-time monitors the network environment or the data flow from the remote UE101, in conjunction with the service configuration information of the remote UE101. Once the monitoring result will trigger change of the service chain policy, the first changing device will change the service chain policy of the remote UE101. Then, the first notifying device notifies the PCEF 105 of the changed service chain policy of the remote UE101 ; the PCEF 105 will implement the changed policy.
In a still further embodiment, the apparatus 300 further comprises a second changing device (not shown in the figure) and a second notifying device (not shown in the figure).
The PCRF 106 receives an indication message from the third-party application 108, including updated relevant information related to the services provided by the third-party application 108. The second changing device changes the service chain policy of the remote UE101 based on such updated information. Then, the second notifying device notifies the PCEF 105 of the changed service chain policy of the remote UE 101 , and the PCEF 105 will implement the changed policy.
Fig. 4 shows a schematic diagram of an apparatus for providing services to a remote UE in SPR according to one embodiment of the present invention. The apparatus 400 comprises: a third receiving device 401 and a fourth transmitting device 402.
Hereinafter, the work process of the apparatus will be described in detail with reference to Fig. 1 and Fig. 2.
The third receiving device 401 receives a first information request from the PCRF 106, as the Profile Request shown in Fig. 2. The first information request includes a D2D relay identifier Relay 1 , the D2D relay identification is used for identifying a correspondence relationship between the remote UE 101 and the relay UE102.
Next, the SPR107 will retrieve the locally saved service configuration information so as to obtain the service configuration information of the remote UE 101.
Then, the fourth transmitting device 402 transmits a first information response to the PCRF106, as the Profile Response shown in Fig. 2. The first information response includes the service configuration information of the remote UE 101.
It should be noted that the present disclosure may be implemented in software or a combination of software and hardware; for example, it may be implemented by a dedicated integrated circuit (ASIC), a general-purpose computer, or any other similar hardware device. In one embodiment, the software program of the present disclosure may be executed by a processor so as to implement the above steps or functions. Likewise, the software program of the present disclosure (including relevant data structure) may be stored in a computer readable recording medium, for example, a RAM memory, a magnetic or optical driver, or a floppy disk, and similar devices. Besides, some steps of functions of the present disclosure may be implemented by hardware, for example, a circuit cooperating with the processor to execute various functions or steps.
Further, a portion of the present disclosure may be applied as a computer program product, for example, a computer program instruction, which, when executed by the computer, may invoke or provide a method and/or technical solution according to the present disclosure through operations of the computer. Further, the program instruction invoking the method of the present disclosure may be stored in a fixed or mobile recording medium, and/or transmitted through broadcast or data flow in other signal bearer media, and/or stored in a working memory of a computer device which operates based on the program instruction. Here, in an embodiment according to the present disclosure, an apparatus comprises a memory for storing a computer program instruction and a processor for executing the program instruction, wherein when the computer program instruction is executed by the processor, the apparatus is triggered to run the methods and/or technical solutions according to a plurality of embodiments of the present disclosure.
To those skilled in the art, it is apparent that the present disclosure is not limited to the details of the above exemplary embodiments, and the present disclosure may be implemented with other forms without departing from the spirit or basic features of the present disclosure. Thus, in any way, the embodiments should be regarded as exemplary, not limitative; the scope of the present disclosure is limited by the appended claims, instead of the above depiction. Thus, all variations intended to fall into the meaning and scope of equivalent elements of the claims should be covered within the present disclosure. No reference signs in the claims should be regarded as limiting the involved claims. Besides, it is apparent that the term "comprise/comprising/include/including" does not exclude other units or steps, and singularity does not exclude plurality. A plurality of units or means stated in the apparatus claims may also be implemented by a single unit or means through software or hardware. Terms such as the first and the second are used to indicate names, but do not indicate any particular sequence.

Claims

Claims
1. A method for providing services to a remote UE in a PC F, the said remote UE communicating with a relay UE via D2D and accessing to an operator's network via the said relay UE, the method comprising steps of:
A. in response to an IP-CAN session establish request from the said remote UE or the said relay UE, transmitting a first information request to an SPPv, wherein the said first information request includes a D2D relay identification which is used for identifying a correspondence relationship between the said remote UE and the said relay UE;
B. receiving a first information response from the said SPR, wherein the first information response includes service configuration information of the said remote UE;
C. generating a service chain policy of the said remote UE based on the said service configuration information of the said remote UE, the said service chain policy indicating network services used by the remote UE, use conditions, and use sequence;
D. transmitting an IP-CAN session establish response to the PCEF, wherein the said IP-CAN session establish response includes the said generated service chain policy of the said remote UE.
2. The method according to claim 1 , wherein after the step B and before the step C, the method further comprises:
if it is determined to inquire a third-party application, transmitting a second information request to the said third-party application;
receiving a second information response from the said third-party application, wherein the said second information response includes relevant information related to services provided by the said third-party application;
the step C further comprises:
generating a service chain policy of the said remote UE based on the service configuration information of the said remote UE and the relevant information related to the services provided by the said third-party application.
3. The method according to claim 1 or 2, wherein the method further comprises:
changing the service chain policy of the said remote UE based on a monitoring result from monitoring a network environment or data flow; and
notifying the PCEF of the changed service chain policy of the said remote UE.
4. The method according to claim 2, wherein the method further comprises:
changing the service chain policy of the said remote UE based on an indication message from the said third-party application, the said indication message includes updated relevant information related to the services provided by the said third-party application;
notifying the said PCEF of the changed service chain policy of the said remote UE.
5. A method for providing services to a remote UE in an SP , the said remote UE communicating with a relay UE via D2D and accessing to a network via the said relay UE, the method comprising steps of:
receiving a first information request from a PCRF, wherein the first information request includes a D2D relay identifier that is used for identifying a correspondence relationship between the said remote UE and the said relay UE;
transmitting a first information response to the said PCRF, wherein the first information response includes service configuration information of the said remote UE.
6. The method according to claim 5, wherein the service configuration information of the said remote UE is preset and includes at least one rule, wherein each rule specifies a condition and a set of services used by the said remote UE corresponding to the condition.
7. The method according to claim 5 or 6, wherein if the said remote UE and the said SPR do not belong to a same operator, one of the following will act as service configuration information of the said remote UE:
default service configuration information;
service configuration information of the said relay UE;
service configuration information of the said remote UE obtained from the home network of the said remote UE.
8. An apparatus for providing services to a remote UE in PCRF, the said remote UE communicating with a relay UE via D2D and accessing to an operator's network via the said relay UE, the apparatus comprising: a first transmitting device configured to, in response to an IP-CAN session establish request from the said remote UE or the said relay UE, transmit a first information request to an SPR, wherein the said first information request includes a D2D relay identification which is used for identifying a correspondence relationship between the said remote UE and the said relay UE; a first receiving device configured to receive a first information response from the said SPR, wherein the first information response includes service configuration information of the said remote UE;
a policy generating device configured to generate a service chain policy of the said remote UE based on the service configuration information of the said remote UE, the service chain policy indicating network services used by the remote UE, use conditions, and use sequence;
a second transmitting device configured to transmit an IP-CAN session establish response to the PCEF, wherein the said IP-CAN session establish response includes the said generated service chain policy of the said remote UE.
9. The apparatus according to claim 8, wherein the apparatus further comprises:
a third transmitting device configured to, if it is determined to inquire a third-party application, transmit a second information request to the said third-party;
a second receiving device configured to receive a second information response from the said third-party application, wherein the said second information response includes relevant information related to services provided by the said third-party application;
the policy generating device is further configured to:
generate a service chain policy of the said remote UE based on the service configuration information of the said remote UE and the relevant information related to the services provided by the said third-party application.
10. The apparatus according to claim 8 or 9, wherein the apparatus further comprises:
a first changing device configured to change the service chain policy of the said remote UE based on a monitoring result from monitoring a network environment or data flow; and
a first notifying device configured to notify the PCEF of the changed service chain policy of the said remote UE.
11. The apparatus according to claim 9, wherein the apparatus further comprises:
a second changing device configured to change the service chain policy of the said remote UE based on an indication message from the said third-party application, the said indication message includes updated relevant information related to the services provided by the said third-party application;
a second notifying device configured to notify the said PCEF of the changed service chain policy of the said remote UE.
12. An apparatus for providing services to a remote UE in an SPR, the said remote UE communicating with a relay UE via D2D and accessing to a network via the said relay UE, the apparatus comprising: a third receiving device configured to receive a first information request from a PCRF, wherein the first information request includes a D2D relay identifier that is used for identifying a correspondence relationship between the said remote UE and the said relay UE;
a fourth transmitting device configured to transmit a first information response to the said PCRF, wherein the first information response includes service configuration information of the said remote UE.
13. The apparatus according to claim 12, wherein the service configuration information of the said remote UE is preset and includes at least one rule, wherein each rule specifies a condition and a set of services used by the said remote UE corresponding to the condition.
14. The apparatus according to claim 12 or 13, wherein if the said remote UE and the said SPR do not belong to a same operator one of the following will act as service configuration information of the said remote UE:
default service configuration information;
service configuration information of the said relay UE;
service configuration information of the said remote UE obtained from the home network of the said remote UE.
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