WO2005053347A1 - Procede et systeme de reseau permettant d'etablir une communication de type p2p entre deux appareils d'utilisateur campant dans des cellules differentes - Google Patents

Procede et systeme de reseau permettant d'etablir une communication de type p2p entre deux appareils d'utilisateur campant dans des cellules differentes Download PDF

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Publication number
WO2005053347A1
WO2005053347A1 PCT/IB2004/052399 IB2004052399W WO2005053347A1 WO 2005053347 A1 WO2005053347 A1 WO 2005053347A1 IB 2004052399 W IB2004052399 W IB 2004052399W WO 2005053347 A1 WO2005053347 A1 WO 2005053347A1
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WIPO (PCT)
Prior art keywords
ues
communication
network system
information
cell
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PCT/IB2004/052399
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English (en)
Inventor
Li Sun
Dan Shang
Robert James Davies
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Koninklijke Philips Electronics N.V.
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Publication of WO2005053347A1 publication Critical patent/WO2005053347A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

Definitions

  • the present invention relates generally to a method and apparatus for establishing P2P (Peer-to-Peer) communication, and more particularly, to a method and apparatus for establishing P2P communication between UEs in different cells.
  • P2P Packet-to-Peer
  • a UE user equipment
  • Fig. 1 illustrates the conventional communication mode, where UE1 and UE25 exchange information through the UTRAN consisting of the base station transceiver (namely Node B) and the Resource Network Co ntroller (RNC), and this communication mode is also called UP -UTRAN-DOWN mode.
  • Fig. 2 illustrates a P2P communication mode, where the dashed line represents signaling link, the solid line represents data link and the arrowhead represen ts direction of information flow. Only signaling link exists between the UTRAN and the UE (user equipment) , while only data link exists between the two communicating UEs. Assume that only resource for maintaining basic communication is needed.
  • a direct link is taken as one unit of radio resource (with fixed frequency, timeslot and spreading code), it can be easily drawn that P2P communication mode only needs two units of radio resource to maintain basic communication. If additional signaling cost for management is ignored, P2P communication can save about 50% radio resource than conventional communication mode. Meanwhile, the UTRAN still holds control over P2P communication, especially over how to use radio resources, so that network operators can easily charge for the radio resources used in P2P communication.
  • TDD Time Division Duplex
  • TD-SCDMA Time Division - Synchronization Code Division Multiple Access
  • RF Radio Frequency
  • a method and apparatus for establishing P2P communication in wireless communication networks is suitable to any TDD CDMA communication system including TD -SCDMA systems, and the disclosures of which are hereby incorporated as reference.
  • a method and apparatus for radio link establishment and maintenance with P2P communication in wireless communicat ion networks is suitable to any TDD CDMA communication system including TD -SCDMA systems, and the disclosures of which are hereby incorporated as reference.
  • a method and apparatus for radio link establishment and maintenance with P2P communication in wireless communicat ion networks as described in a patent application entitled "A Method and Apparatus for Radio Link Establishment and Maintenance with P2P Communication in Wireless
  • TD-SCDMA systems is allocated to the UEs by the network system via the base station in the cell where the UEs are camping.
  • a UE moves the carrier frequency of receive and transmit signals to the carrier frequency used by the cell where the other UE is camping, it may not be able to access the cell which the base station belongs to due to a too long distance away from its base station, poor propagation enviro nment of wireless communication or traffic overload of the cell.
  • the P2P communication requires the two communicating UEs use the same radio resource .
  • the radio resource used by each cell is allocated and managed by the RNC.
  • An object of the present invention is to provide a P2P communication establishment method and apparatus for UEs who camp on different cells. This method and apparatus can save radio resource and increase system capacity, as well as reduce interferences and improve system communication quality.
  • each UE has t o increase its transmission power to maintain its conventional link with access node B, which will inevitably produce signal interference to other communication links in its cell and adjacent cells, (b)
  • each UE communicates with its own access node , so interference between systems will be caused no matter than the overlapped area is due to network planning of different operators or the consideration of network operators about the traffic load balance of the network .
  • P2P communication mode can be a more reasonable option if the distance between the two UEs satisfies the requirement for P2P communication .
  • a method for establishing P2P (Peer-to-Peer) communication between two UEs in accordance with the present invention comprises: (a) receiving a call request from the calling UE of the two UEs; (b) judging whether the two UEs are camping on the same cell; (c) sending a paging message to the called UE if the two UEs are camping on different cells; (d) receiving a paging response from the called UE; and (e) determining whether the two UEs satisfy the requirement for P2P according to the call request and the paging response; (f) establishing P2P link for P2P communication between the two UEs if the requirement for P2P communication is satisfied.
  • P2P Packeer-to-Peer
  • a method to be performed by a UE, for the UE to establish P2P (Peer-to-Peer) communication with the other UE comprises: sending a call request to a network system for establishing P2P communication with the other UE in a different cell; receiving radio resource for P2P link probing sent by the network system via the downlink of the cell where the UE is camping; utilizing the radio resource to carry out P2P link probing; performing P2P communication with the other UE after P2P connect probing succeeds.
  • P2P Packeer-to-Peer
  • Fig.1 is a schematic diagram illustrating a TD -SCDMA system employing conventional communication mode
  • Fig.2 is a schematic diagram illustrating a TD -SCDMA system employing P2P communication mode
  • Fig.3A is a schematic diagram illustrating two UEs are camping on the borders of two adjacent cells managed by the same RNC respectively
  • Fig.3B is a schematic diagram illust rating two UEs are camping on the overlapped area of two different cells managed by the same RNC
  • Fig.4A is a schematic diagram illustrating two UEs are camping on the borders of two adjacent cells those are not managed by the same RNC but belong to the same CN
  • Fig.4B is a schematic diagram illustrating two UEs are camping on the overlapped area of two different cells those are not managed by the same RNC but belong to the same CN
  • Fig.1 is a schematic diagram illustrating a TD -SCDMA system employing conventional communication mode
  • Fig.2 is a schematic diagram
  • the two UEs may also camp on the overlapped area of the two cells respectively, as shown in Fig.3B.
  • the two UEs are camping on two different cells, more specifically, the two UEs access two different nodes as NodeBI and NodeB2, and the two nodes are controlled by two different RNCs as RNC1 and RNC2 respectively but RNC1 and RNC2 belong to the same CN. This means the two UEs are controlled by two different UTRAN s in the same CN .
  • the two UEs are camping on two different cells, more specifically, the two UEs access two different nodes as NodeBI and NodeB2, and the two nodes are controlled by two different RNCs in different CNs. That means the two UEs belong to different CNs.
  • the different CNs may be run by the same network operator or different operators.
  • the two UEs are respectively camping on the borders of two adjacent cells, it can be shown as Fig.5A; if the two UEs are camping in the overlapped area of tw o adjacent cells respectively, it can be shown as Fig. ⁇ B.
  • the two UEs are camping on different cells, more specifically, the two UEs access two different nodes as NodeBI and NodeB2, NodeBI and NodeB2 are controlled by two different RNCs as RNC1 and RNC 2, RNC1 and RNC2 belong to different CNs as CN1 and CN2, and CN1 and CN2 are run by different network operators. This means the two UEs are registered in different PLMNs.
  • CN1 and CN2 belong to d ifferent PLMNs.
  • descriptions will be given to the procedure for establishing P2P communication between UEs in different cells to be executed by the network system and the UE in accordance with the present invention, in a TD-SCDMA system, in conjunction with Fig.4B.
  • the procedure for establishing P2P communication between UE1 and UE2 in different cells in accordance with the present invention can be divided into four parts .
  • UE1 and UE2 respectively select their suitable cells to register through cell search procedure after powering on (step S101). As shown in Fig.4B, after successful registration, UE1 will camp on the cell managed by NodeBI and UE2 will camp on the cell managed by NodeB2.
  • UE1 When UE1 wants to communicate with UE2, it will send a call request to NodeBI for communicating with UE2, via random access proceedu re, as the same as in conventional mode (step S102).
  • the call request should at least include information about whether UE1 has P2P communication capability and UE1 's location information.
  • NodeBI sends the call request to its RNC1 (step S103). After receiving the call request, RNC1 judges whether
  • P2P communication mode should be preferred (step S104). If RNC1 doesn 't prefer P2P communication mode, it will establish conventional communication link between UE1 and UE2 accordi ng to conventional communication mode (step S503). If P2P communication mode is preferred, RNC1 queries the CN and related HLRA/LR (Home Location Register ⁇ isitor Location Register) according to UE2 's identification number such as IMSI (International Mobil e Subscriber Identity) or MSISDN (Mobile Station's ISDN Number) included in the call request, to obtain UE2 's registration information. Then, RNC1 judges whether UE1 and UE2 are camping on the same cell according to UE2 's registration information (step S10 5).
  • IMSI International Mobil e Subscriber Identity
  • MSISDN Mobile Station's ISDN Number
  • P2P communication will be established and maintained between UE1 and UE2, by using the methods and apparatuses as described in the application with the application Serial NO. as 03119892.9 and 03119895.3. If UE1 and UE2 are in different cells, the method in the present invention will be started to establish P2P communication between UEs camping on different cells. II Determining whether UE1 and UE2 satisfy the requirement for establishing P2P communication RNC1 transfers the call request from UE1 to RNC2 to which UE2 belongs. The transferred call request should at least include the information about whether UE1 has P2P communication capability and UE1 's location information.
  • RNC1 can obtain UE1 's location information, through GPS for instance, and add it into the transferred call request.
  • RNC2 After receiving the transferred call request, RNC2 will send a paging message to UE2 via NodeB-2 (step S 106).
  • the routing procedure for transferring the call request from RNC1 to RNC2 can transfer signals between RNC1 and RNC2 according to the provisions in communication protocols.
  • UE2 After receiving the paging message, UE2 sends a paging response to RNC2 via NodeB-2 (step S107).
  • the paging response should at least include information about whether UE2 has P2P communication capability, and UE2's location information can also be included.
  • RNC2 ca n also obtain UE2's location information, through GPS for instance.
  • RNC2 determines whether P2P communication can be established between UE1 and UE2, according to the transferred call request, the information about whether UE1 and UE2 have P2P communication capability, UE1 and UE2's location information, and the P2P policy of the network to which RNC2 belongs (i.e.: whether RNC2 permits P2P communication mode and etc), (step S109).
  • step S503 If the requirement for establishing P2P communication between UE1 and UE2can't be satisfied, conventional communication link will be established between UE1 and UE2 according to conventional communication mode (step S503). If the requirement for establishing P2P communicati on between UE1 and UE2 can be satisfied, RNC2 sends a connect message to RNC1 , indicating that UE2 has accepted the call request (step S110).
  • the connect message should include a flag for indicating UE1 and UE2 satisfy the requirement for P2P communication, and may also include information about whether RNC2 is willing to provide radio resource for P2P link.
  • RNC1 receives the connect message from RNC2 (step S11), and learns whether UE1 and UE2 satisfy the requirement for P2P communication according to the connect message.
  • the above procedure for judging whether UE1 and UE2 satisfy the requirement for P2P communication can be accomplished in RNC1.
  • the connect message sent to RNC1 by RNC2 should include information about whether UE2 has P2P communication capability, UE2's location information, the information about the P2P policy of the network to which RNC2 belongs, such as whether RNC2 permits to adopt P2P communication mode , and the information about whether RN C2 is willing to provide radio resource for P2P link.
  • RNC1 determines whether P2P communication can be established between UE1 and UE2, according to the call request from UE1 and the information included in the connect message from RNC2, which includes whether UE1 and UE2 have P2P communication capability, UE1 and UE2's location information, and the P2P policy of RNC2 's network , and sends the judgment result to RNC2.
  • Ill UE1 and UE2 attempts to establish P2P communication by using the allocated radio resourc e
  • RNC1 and RNC2 identify the system synchronization shift between NodeB -1 and NodeB-2 (step S201), to guarantee that UE1 or UE2 can access the corresponding cell correctl y when switching to the cell managed by NodeB -2 or NodeB-1.
  • the procedure for identifying synchronization shift is similar to the procedure for identifying synchronization shift between cells during cell handover in conventional protocols.
  • RNC1 and RNC2 should negotiate about who provides radio resource and manages P2P link after synchronization shift is determined (step S202).
  • the current radio resource utilization, the cell coverage range , current traffic load in the cells managed by NodeB -1 and NodeB-2 and the mobility of UE1 and UE 2 should be sufficiently taken into consideration.
  • RNC1 takes charge of providing P2P radio resource and P2P link management after negotiation, then RNC1 provides specific system information to UE2 via RNC2-NodeB-2 (step S203).
  • the system information includes the carrier frequency, code group used by the cell managed by NodeBI and the above determined synchronizat ion shift information.
  • RNC2 takes charge of providing radio resource for P2P communication and P2P link management after negotiation, the system information that should have been allocated and provided by RNC1 will be provided by RNC2, while the followi ng steps that should have been executed by RNC1 and RNC2 respectively will be accomplished by the corresponding RNC2 and RNC1 (step S204). After acquiring the system information provided by RNC1 via
  • UE2 will start a random access procedure (s tep S205), and attempts to access the cell managed by NodeB -1 by using the system information provided by RNC1 (step S206). That is: UE2 will move the carrier frequency from that used by the cell managed by NodeB -2 to that by NodeB-1. Meanwhile, UE2 record s its current state in NodeB -2. If UE2's access to NodeB-1 fails, UE2 returns back to its former state in NodeB-2, and acquires radio resource allocated by RNC2 via RNC2-NodeB-2 (step S502), then continues with conventional communication (step S503).
  • RNC1 sends radio resource for P2P link probing to UE1 and UE2 via NodeB -1 respectively , such as information about timeslots allocated for P2P communication and etc (step S207).
  • UE1 and UE2 move to the allocated P2P dedicated channel P2P -DCH (step S207).
  • step S208 start P2P connect probing (step S209), to determine whether
  • P2P communication can be conducted between UE1 and UE2 by using the allocated P2P-DCH (step S210). If P2P connect probing fails, UE2 returns back to its former state in
  • NodeB-2 acquires the radio resou rce allocated by RNC2 via
  • step S502 RNC2-NodeB-2
  • step S503 RNC2-NodeB-2
  • step S503 If P2P connect probing succeeds, UE1 or UE2 sends a P2P connect probing success message to RNC1 via NodeB -1 (step S211), indicating that
  • RNC1 sends a P2P connect confirm message to RNC2, to inform RNC2 that UE1 and UE2 are ready to start P2P communication (step S 301).
  • RNC2 After receiving the P2P connect confirm message from RNC1, RNC2 records UE2's state, and updates UE2 's related information in HLR/VLR (step S302), so that the network system can get UE2 's correct location information from HLR/VLR after UE2 alters the registered cell when UE2 's location information is needed.
  • RNC2 reclaims the radio resource occupied by the control link between NodeB-2 and UE2, and UE2 is managed by NodeB -1/RNC1 (step S303).
  • UE1 and UE2 start P2P communication in the same cell a naged by
  • step S304 the maintenance of the P2P link can refer to the application with the application
  • UE2 When P2P communication ends, UE2 will be forced to carry out a routine cell search and location update procedure, to ensure that it registers in the most suitable cell and update location information in HLR VLR (step S401).
  • the above description is given to the procedure for establishing P2P communication between UE1 and UE2 in different cells that are managed by different RNCS but belong to the same CN as shown in Fig.4B, in conjunction with Fig. ⁇ A and Fig. ⁇ B.
  • the present invention provides different solutions for the above -mentioned cases about whether two UEs are ca mping on two cells managed by the same RNC, whether the two cells belong to the same CN and whether the two cells belong to the PLMN runby the same network operator.
  • RNC1 and UE2 are camping on different cells managed by different RNCs as RNC1 and RNC2, but RNC1 and RNC2 belong to the same CN In this case (as shown in Fig.4B), RNC1 sends the call request to RNC2 via CN, RNC2 sends message to UE2 via NodeB -2 after receiving the call request, and vice versa .
  • the P2P communication establishment procedure is the same as the procedure as described in above embodiment. 3. If UE1 and UE2 are camping on different cells managed by different
  • RNCs as RNC1 and RNC2, and RNC1 and RNC2 belong to different CNs as CN1 and CN2 In this case (as shown in Fig.5B), RNC1 sends the call request to RNC2 via CN1 and CN2, RNC2 sends message to UE2 via NodeB -2 after receiving the call request, and vice versa.
  • RNC1 sends the call request to RNC2 via CN1, inter -connecting gateway ( if inter-connecting gateway exists between two PLMNs ) and CN2, RNC2 sends message to UE2 via NodeB -2 after receiving the call request, and vice vers a.
  • P2P communication between UE1 and UE2 in different cells can be achieved based on the above embodiments, in all above cases where the two cells are managed by the same RNC, or by different CNs or by different PLMNs, except that the routing situation between each RNC may be different.
  • the method for establishing P2P communication between UE1 and UE2 in different cells as proposed in the present invention can be implemented in computer software, or hardware mod ule with software functions, or in combination of software and hardware.
  • the network s ystem structure is shown in Fig.7, wherein the components the same as in conventional network systems are not given.
  • network system 100 comprises: a receiving unit 101 , for receiving a call request from the calling UE (e.g.
  • UE1 of UE1 and UE2 who attempt to establish P2P communication, wherein the call request at least includes information about UE1 's P2P communication capability; a judging unit 102, for judging whether the two UEs are camping in the same cell; a sending unit 104, for sendi ng a paging message to the called UE (e.g.
  • judging unit 102 when the judging unit judges that the two UEs are camping on different cells; after receiving unit 101 receives a paging response sent by the called UE2, judging unit 102 will determine whether the two UEs sa tisfy the requirement for P2P communication according to the call request and the paging response, wherein the paging response at least include information about the called UE2's P2P communication capability; if the judging unit judges that P2P communicati on requirement is satisfied, establishing unit 103 will establish P2P link for P2P communication between the two UEs.
  • sending unit 104 sends the system information of the cell where the other UE (such as UE1 ) camps to one UE of UE1 and UE2 (such as UE2) , so that UE2 can switch to the same cell as UE1, wherein the system information at least includes the carrier frequency used by the cell where UE1 camps, synchronization shift between the cells where UE1 and UE2 camp.
  • sending unit 103 sends radio resource for P2P link probing to the two UEs, wherein the radio resource at least includes information about the timeslots allocated for P2P communication.
  • updating unit 105 When receiving unit 101 receives the P2P connect probing success message sent by UE1 or UE2, updating unit 105 will update the location information of UE2 who changed a cell to camp on HLRA LR to its location information in current cell.
  • the negotiating units and management units in the network systems decide which network system will take charge of the above system information sent to UE2 and radio resource provided to UE1 and UE2 for P2P communication.
  • transferring unit 106 in network system 100 first transfers UE1 's call request to the called network system to which the called UE2 belongs (the called network system can have basically same modules as the calling network system 100).
  • the receiving unit in the called network system receives the forwarded call request, and sends a paging message to the called UE2 via the sending unit.
  • the sending unit in the called network system will send a connect message to the calling network system 100 according to the paging response.
  • Negotiating unit 107 in the calling network system 100 negotiate s with the negotiating unit in the called network system about the calling network system 100 or the called network system provides the above system information and radio resource for P2P communication.
  • the management unit in the network responsible for providing radio resource for P2P communication (e.g. if network system 100 is responsible for providing system information and P2P radio resource, it will be management unit 108 in network system 100), manages the P2P link between UE1 and UE2 during P2P communication course according to the negotiation result.
  • the present invention proposes a method and apparatus for establishing P2P c ommunication between UE1 and UE2 in different cells.
  • UE2 in the cell managed by NodeB -2 can obtain system information such as the carrier frequency of the cell where UE1 camps via the route between RNC1 to which UE1 belongs and RNC2 to which UE2 belongs and the link between RNC2 and NodeB2, thus accesses the same cell as UE ln this way, the present invention skillfully converts the problem of establishing P2P communication between UE1 and UE2 in different cells into a procedure for establishing P2P communication between UE1 and UE2 in the same cell, moreover it can continue to use the various schemes for avoiding interferences caused by introducing P2P communication as described in the above application documents.
  • radio resources of the communication system can be saved to increase system capacity and mitigate interferences so as to improve communication quality of the communication system.
  • the method for establishing P2P communication between UE1 and UE2 in different cells as disclosed in this invention is not limited herein for TD -SCDMA systems, but also applicable to other TDD radio systems.
  • TSM TD-SCDMA for Mobile
  • the above operations performed, by Node B, RNC and CN in the present invention will be executed by BSS (Base station transceiver and controller) and MSC (Mobile Switching

Abstract

Procédé trouvant application dans un système de réseau et servant à établir une communication entre homologues de type P2P entre deux appareils d'utilisateur (UE). Ce procédé consiste à recevoir une demande d'appel en provenance de l'UE appelant parmi les deux UE (s102) ; à déterminer si les deux UE campent dans la même cellule (s105); à envoyer à l'UE appelant un message de recherche de correspondant lorsque les deux UE campent dans des cellules différentes (s106); à recevoir une réponse de recherche en provenance de l'UE appelant (s108); et à déterminer si les deux UE satisfont à l'exigence de communication de type P2P en fonction de la demande d'appel et de la réponse de recherche (s109). Selon un mode de réalisation, des informations de système sont envoyées à un UE afin que cet UE puisse se commuter sur la même cellule (s203), et des informations de ressource radioélectrique pour le sondage de liaisons entre homologues sont envoyées aux deux UE une fois qu'ils ont accès à la même cellule (s207). Les cellules peuvent être gérées par des systèmes de réseau différents, et la demande d'appel, la réponse de recherche et un message de raccordement en provenance d'un autre réseau peuvent comprendre une fonctionnalité de communication de type P2P de l'UE appelant ou appelé respectif.
PCT/IB2004/052399 2003-11-27 2004-11-16 Procede et systeme de reseau permettant d'etablir une communication de type p2p entre deux appareils d'utilisateur campant dans des cellules differentes WO2005053347A1 (fr)

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CNA2003101186461A CN1622678A (zh) 2003-11-27 2003-11-27 在处于不同小区中的用户终端之间建立点到点通信的方法和装置
CN200310118646.1 2003-11-27

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