WO2006134562A2 - Methode et appareil pour etablir une communication de relais a deux sauts dans des systemes de communication sans fil - Google Patents

Methode et appareil pour etablir une communication de relais a deux sauts dans des systemes de communication sans fil Download PDF

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Publication number
WO2006134562A2
WO2006134562A2 PCT/IB2006/051902 IB2006051902W WO2006134562A2 WO 2006134562 A2 WO2006134562 A2 WO 2006134562A2 IB 2006051902 W IB2006051902 W IB 2006051902W WO 2006134562 A2 WO2006134562 A2 WO 2006134562A2
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Prior art keywords
relaying
communication
cell
uel
data transmission
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PCT/IB2006/051902
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English (en)
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WO2006134562A3 (fr
Inventor
Sheng Pan
Li Sun
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Koninklijke Philips Electronics N.V.
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Publication of WO2006134562A2 publication Critical patent/WO2006134562A2/fr
Publication of WO2006134562A3 publication Critical patent/WO2006134562A3/fr

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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
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H04W40/28—Connectivity information management, e.g. connectivity discovery or connectivity update for reactive routing
    • 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 wireless communication field, and more particularly, to a method and apparatus of realizing two-hop relaying communication in wireless communication systems.
  • a UE In conventional cellular communication systems, regardless of the distance between two communicating User Equipments (UEs), a UE has to communicate with another UE only via the relaying of a base station.
  • Fig. 1 illustrates the conventional communication scheme, where UEl and UE2 communicate with each other via the Universal mobile telecommunications system Terrestrial Radio Access Network (UTRAN) consisting of the base station (Node B) and the Radio Network Controller (RNC).
  • UTRAN Universal mobile telecommunications system Terrestrial Radio Access Network
  • Node B base station
  • RNC Radio Network Controller
  • traffic QoS Quality of Service
  • data transmission rate is guaranteed mainly by wireless signal processing techniques.
  • traffic QoS e.g. data transmission rate
  • wireless signal processing techniques due to the characteristics of radio propagation, it is hard to improve traffic QoS, e.g. data transmission rate, by wireless signal processing techniques, to meet demands of video and other new wireless traffic, which require much higher QoS.
  • both academia and industrial community propose some new concepts for the wireless network architecture.
  • Fig. 2 illustrates a P2P communication scheme. As shown in Fig. 2, the dashed line represents control link, the solid line represents traffic link, and the arrowhead represents the direction of information flow. There is only control link between the UTRAN and the UEs, while only traffic link exists between two communicating UEs. Comparing with the conventional communication scheme as shown in Fig. 1, P2P communication can save almost half of the radio resources.
  • P2P communication can achieve better transmission quality and transmission delay than being relayed/forwarded by a base station, thereby achieving a higher data transmission rate.
  • application of P2P communication is rather limited for the reason that P2P communication is performed only when two UEs are close to each other.
  • Another new concept is to adopt multi-hop relaying for communication between UEs in a wireless communication network.
  • direct communication namely P2P communication
  • P2P communication is available between two UEs when they are all in their respective communication coverage.
  • the communication has to be forwarded by an third UE between the two UEs.
  • the third UE also serve as a router, which assumes the duty of searching routes and forwarding messages.
  • each UE Since the communication range of each UE is rather limited in the multi-hop network, only via the forwarding of a plurality of UEs, will data reach to the destination.
  • Communication can be carried out by means of freely networking among UEs in the multi-hop wireless communication network, without the support of wired infrastructure such as base station and the like.
  • the appearance of multi-hop wireless communication network not only gives impetus to the course of free communication under any situations, but also provides an effective solution to military communication, disaster rescue and temporary communication.
  • each UE needs to know routes for reaching all other UEs and all UEs can be moving, so maintaining the dynamically varying route information demands enormous control overheads.
  • the present invention proposes a method of establishing two-hop relaying communication in a wireless communication system, the method comprising the steps of: receiving from a first UE a request for communicating with a communication device via multi-hop relaying; selecting a second UE as a relaying device according to predefined conditions; and establishing corresponding links to make the first UE can communicate with said communication device via the relaying of the second UE.
  • the present invention also provides an apparatus of establishing two-hop relaying communication in a wireless communication system, the apparatus comprising: receiving means, for receiving from a first UE a request for communication with a communication device via multi-hop relaying; determining means, for selecting a second UE as a relaying device according to predefined conditions; and link establishing means, for establishing corresponding links to make the first UE can communicate with the communication device via the relaying of the second UE.
  • the present invention further provides a method of establishing two-hop relaying communication in a wireless communication system, the method comprising the steps of: sending to a network system a request for communicating with a communication device via multi-hop relaying; receiving from the network system corresponding confirmation information, wherein the confirmation information contains information about a UE that serves as a relaying device; and establishing link with the relaying device to make communication with the communication device via the relaying of the relaying device.
  • the present invention further proposes a UE, the UE comprising: estimating means, for estimating data transmission rate of conventional uplink/downlink traffic link; conventional communication means for, if the data transmission rate of the conventional uplink/downlink traffic link is less than a predetermined value, sending to a network system a request for communication with a communication device via multi-hop relaying and receiving from the network system corresponding confirmation information, wherein the confirmation information contains information about a UE that serves as a relaying device; and P2P communication means, for establishing a link with the relaying device to make communication with the communication device through the relaying of the relaying device.
  • Fig. 1 is a schematic diagram showing a conventional uplink/downlink communication scheme relayed by a base station
  • Fig. 2 is a schematic diagram showing a P2P communication scheme in a wireless communication system
  • Fig. 3 is a schematic diagram showing a P2P-based two-hop relaying wireless communication scheme according to the first embodiment of the present invention
  • Fig. 4 is a flow chart showing the process for establishing two-hop relaying wireless communication of the UE requesting for relaying according to the first embodiment of the present invention
  • Fig. 5 is a flow chart showing the process for establishing two-hop relaying wireless communication of a relaying candidate according to the first embodiment of the present invention
  • Fig. 6 is a flow chart showing the process for establishing two-hop relaying wireless communication of the network, namely the UTRAN, according to the first embodiment of the present invention
  • Fig. 7 is a schematic diagram showing a P2P-based two-hop relaying wireless communication scheme according to the second embodiment of the present invention
  • Fig. 8 is a flow chart showing the process for establishing two-hop relaying wireless communication of the UE requesting for relaying according to the second embodiment of the present invention
  • Fig. 9 is a flow chart showing the process for establishing two-hop relaying wireless communication of a relaying candidate according to the second embodiment of the present invention.
  • Fig. 10 is a flow chart showing the process for establishing two-hop relaying wireless communication of a cell on which the UE requesting for relaying is camping according to the second embodiment of the present invention
  • Fig. 11 is a flow chart showing the process for establishing two-hop relaying wireless communication of a cell on which a relaying candidate is camping according to the second embodiment of the present invention
  • Fig. 12 is a schematic diagram showing the corresponding functional units in a UE according to the present invention.
  • Fig. 13 is a schematic diagram showing the functional units of an apparatus of establishing two-hop relaying communication in a wireless communication system.
  • Fig. 3 is a schematic diagram showing a P2P-based two-hop relaying wireless communication scheme according to the first embodiment of the present invention.
  • the UE requesting for relaying and the relaying UE are camping in the same cell.
  • UEl in the uplink direction (from UEl to the base station), if wants to communicate with UE3, UEl delivers its traffic to relaying UE2 via P2P link, while relaying UE2 is responsible for forwarding the traffic to the base station (Node B) and finally sending to UE3 via the network.
  • relaying UE2 receives from the base station traffic of UE3 sent from the network and then forwards the received traffic to UEl via P2P link.
  • P2P communication between UEl and relaying UE2 may either employ the conventional air interface, i.e. the air interface between relaying UE2 and the base station, or employ another one, such as IEEE802.il a. Choosing a different air interface can avoid interference, but it puts additional requirement on RF modules. In order to reuse existing hardware and reduce costs as much as possible, it is a preferred solution of the present invention to choose a conventional air interface for P2P communication between UEl and relaying UE2.
  • Relaying UE2 in Fig. 3 is a mobile terminal.
  • the relaying UE may also be a fixed terminal. The following description is based on the case in which a mobile terminal is used as a relaying device.
  • the UEs used in the present invention have both P2P communication capability and capability of conventional communication with a base station.
  • a UE can choose to be or not to be relayed to get higher data transmission rate.
  • UEs with relaying capability volunteer to relay for others.
  • Selection of an appropriate relaying device is determined by a higher-data- transmission-rate-oriented strategy performed at both the network (hereinafter referred to as UTRAN) side and the relaying device side.
  • the decision at the UTRAN is made according to the following criterion:
  • R _ MAX max ⁇ min ⁇ R2( ⁇ ), R12(i) ⁇ I R2(i) ⁇ R _ EXP, R12(i) ⁇ R _ EXP ⁇ ⁇ eS wherein,
  • R_MAX is the maximum available data transmission rate for the two-hop relaying communication
  • R_EXP is the expected data rate of the UE requesting for relaying; i is the index of relaying candidates;
  • S is the set of all relaying candidates
  • R2(i) is the estimated available data transmission rate for conventional link of the i th relaying candidate
  • R12(i) is the estimated available data transmission rate for P2P link with the UE requesting for relaying of the i th relaying candidate.
  • Each relaying candidate will first estimate available data transmission rates for the two-hop relaying communication.
  • the relaying candidate can report the minimum value of R2(i) and R12(i) to the UTRAN. Then the UTRAN will select a relaying device with the maximum data transmission rate from all relaying candidates according to above-mentioned formula.
  • the available data rates are evaluated by the relaying candidate based on an overall criterion including SIR (Signal to Interference Ratio), available radio resources, transmission power loss and other factors.
  • SIR Signal to Interference Ratio
  • Fig. 4 is a flow chart showing the process of the UE requesting for relaying
  • Fig. 5 is a flow chart showing the process of each relaying candidate
  • Fig. 6 is a flow chart showing the process of the network, namely the UTRAN.
  • UEl establishes conventional uplink/downlink communication with the UTRAN as shown in step S401. If UEl has already connected to the UTRAN, the flow directly starts with the next step without step
  • UEl After the establishment of link, UEl maintains its link with the UTRAN, and keeps measurements and monitors data transmission rate of the link at regular intervals, just as shown step S402. Next, UEl determines whether the average data transmission rate (Rl) over a certain period of time is larger than its lowest acceptable data transmission rate threshold
  • step S403 If Rl is larger than or equal to R_LOW, UEl keeps original link with the UTRAN, i.e., the flow returns to step S402.
  • step S404 UEl sends an INITIAL_RELAYING_REQUEST message to the UTRAN, indicating that the conventional uplink/downlink communication with the UTRAN cannot meet its demands on data transmission rate and two-hop relaying communication is needed in order to satisfy its demands on data transmission rate.
  • the INITIAL_RELAYING_REQUEST message contains UEl 's identity and its expected data rate R_EXP.
  • step S405. UEl takes further actions based on the response from the UTRAN.
  • UEl stops relaying attempt and returns to its conventional communication state, just as shown in step S412. If UEl receives the INITIAL_RELAYING_CONFIRM message from the UTRAN,
  • UEl begins to search for possible two-hop relaying route, i.e., begins to search for a most suitable relaying device.
  • UEl broadcasts a RELAYING_ROUTE_REQUEST message to other UEs in its surrounding areas, so as to search for a most suitable relaying device.
  • the format of the RELAYING_ROUTE_REQUEST message is assumed known to all UEs and should contain at least the information of UEl 's identity and its expected data rate (R_EXP). In general, R_EXP is larger than the aforesaid threshold R_L0W. Sending power of this message should be controlled within a suitable range in order to reach a certain range of potential candidate relaying UEs.
  • UEl starts a timer Tl as shown in step S407. This timer sets the waiting time for receiving indication from the UTRAN. As shown in step S408, UEl waits for reply from the UTRAN. If UEl receives a
  • UEl If UEl receives the RELAYING_ROUTE_INDICATION message before TI expires, then it extracts related information from the indication and negotiates with the relaying device on allocated channel to establish P2P link, just as shown in steps S409, S413 and S414. After the relaying device has established conventional link with the UTRAN, UEl starts two-hop relaying communication with the UTRAN relayed by the relaying device, just as shown in step S415.
  • UE 1 stops relaying attempt and returns to its conventional communication with the UTRAN, just as shown in steps S409, S410, S411 and S412.
  • UEs in the vicinity of UEl may receive the RELAYING_ROUTE_REQUEST message from UEl , just as shown in step S501.
  • these UEs On receiving this message, these UEs first decide whether they are willing to or capable of relaying, just as shown in step S502.
  • a UE If a UE is not willing to or capable of relaying, it does not respond to the RELAYING_ROUTE_REQUEST message and returns to its original state, just as shown in step S509.
  • a UE for example, UE2 If a UE, for example, UE2, is willing to and capable of relaying, it estimates available data transmission rates for its conventional link with the UTRAN (R2) and P2P link with UEl (R12) according to the measurement of each link and its available radio resources required to support both links, just as shown in step S503.
  • R2 UTRAN
  • R12 P2P link with UEl
  • the UE decides whether the minimum value of R2 and R12 is larger than expected data transmission rate R_EXP of UEl, just as shown in step S504.
  • the UE sends a CANDID ATE_ RELAYING_REPORT message to the UTRAN and starts a timer T2, just as shown in step S505.
  • Timer T2 sets the waiting time for the indication from the UTRAN.
  • a relaying candidate receives the RELAYING_ROUTE_INDICATION message from the UTRAN before T2 expires, then it extracts related information from the message and negotiates with UEl on allocated channel to establish P2P link and establishes conventional link with the UTRAN, just as shown in steps S506, S507, S510, S511, S512 and S513.
  • step S601 the INITIAL_RELAYING_REQUEST message from UEl
  • the UTRAN extracts from the message the identity information of UEl and its expected data transmission rate R_EXP as shown in step S602.
  • the UTRAN decides in step S603 whether it can provide two-hop relaying communication for UEl with the expected data transmission rate.
  • the UTRAN If the UTRAN can not provide two-hop relaying communication for UEl, it sends to UEl a RELAYING_ROUTE_REJECT message to notify UEl that it can not provide two-hop relaying communication, as shown in step S619, and then returns to its original state as shown in step S620.
  • the UTRAN can provide two-hop relaying communication for UEl, it sends to UEl an INITIAL_RELAYING_CONFIRM message to notify UEl that it can provide two- hop relaying communication, just as shown in step S604.
  • the UTRAN prepares an empty list Ll for UEl to record the information of possible relaying candidates, just as shown in step S605.
  • the UTRAN starts a timer T3 for UEl as shown in step S 606, and waits for reports from possible relaying candidates as shown in step S607.
  • the UTRAN If the UTRAN receives CANDID ATE_RELAYING_REPORT message(s) from one or several relaying candidates, which are capable of providing relaying service for UEl, before T3 expires, the UTRAN extracts the candidate's identity and its available data transmission rate R_MIN and then records identity of the relaying candidate and the data transmission rate R_MIN into list Ll, just as shown in steps S608, S609 and S610.
  • the UTRAN keeps a watch on whether T3 expires just as shown in step S611.
  • the UTRAN checks whether the list Ll used for recording relaying candidates for UEl is empty, just as shown in step S612.
  • the UTRAN sends to UEl a RELAYING_ROUTE_REJECT message indicating that two-hop relaying communication cannot be performed, and returns to its original state, just as shown in steps S619 and S620.
  • the UTRAN selects the relaying candidate with maximum data transmission rate as the relaying device for UEl. That is, the UTRAN selects from the relaying candidates the relaying device according to the above-mentioned formula, i.e.
  • R _ MAX max ⁇ min ⁇ R2( ⁇ ), R12(i) ⁇ I R2(i) ⁇ R _ EXP, R ⁇ 2(i) ⁇ R _ EXP ⁇ ⁇
  • the UTRAN After selecting the relaying device, the UTRAN begins to allocate radio resources for two-hop relaying communication, including the conventional link between the relaying device and the UTRAN, and the P2P link between UEl and the relaying device, just as shown in step S615. If resources allocation for the two-hop link is successful, the UTRAN sends a
  • REL AYING_ROUTE_INDIC ATION message to UEl and the relaying device respectively, as shown in step S616.
  • the RELAYING_ROUTE_INDIC ATION message contains the identities of UEl and the relaying device, the allocated radio resources, and available data transmission rate R_MAX.
  • the UTRAN begins to establish conventional link with the relaying device, and based on this, establishes two-hop relaying communication with UEl relayed by the relaying device, just as shown in steps S617 and S618.
  • the UTRAN sends a RELAYING_ROUTE_REJECT message to UEl and returns to its original state, just as shown in steps S619 and S620.
  • control channel including control channel between UEl and the UTRAN, control channel between the relaying candidates, the relaying device and the UTRAN, and control channel between UEl and the relaying candidates, the relaying device.
  • the RELAYING_ROUTE_REQUEST message sent out from the UE requesting for relaying (namely UEl) is broadcasted on a certain common control channel assigned by the UTRAN for the purpose of relaying, which is also scanned regularly by each UE in the cell.
  • Another thing needing some explanation is that due to the possible mobility of the relaying device and UEl, the two-hop relaying communication might be unstable.
  • the proposed two-hop relaying communication scheme can be used to provide a value-added service to attract mobile users with high speed data service demand. When a mobile user cannot achieved expected data transmission rate from conventional uplink/downlink communication with the network, this service can help to find a qualified relaying route to satisfy the user's need.
  • the proposed scheme can further be utilized to enhance effective service coverage range for deployed network. Due to dynamic and unpredictable changes of environment conditions and population distribution, the coverage range of a mobile network especially for high speed data transmission service often becomes unsatisfactory.
  • Fig. 7 is a schematic diagram showing a P2P-based two-hop relaying wireless communication scheme according to the second embodiment of the present invention.
  • UEl that requests for relaying and UE2 that serves as the relaying device are not in the same cell. That is, UEl that requests for relaying is under the control of base station 1 of CELL 1, while UE2 is under the control of base station 2 of CELL 2.
  • the difference between the second embodiment shown in Fig. 7 and the first embodiment shown in Fig. 3 is that: in the two-hop relaying wireless communication scheme as shown in Fig. 7, UEl that requests for relaying and UE2 that serves as the relaying device are in different cells.
  • the proposed inter-cell two-hop relaying communication scheme will provide additional relaying possibility to increase data transmission rate for the UEl requesting for relaying.
  • the proposed inter-cell two-hop relaying communication scheme is based on the cooperation of two cells.
  • the UEl requesting for relaying and the relaying device are under control of their camping cells respectively.
  • the information of allocated radio resources is exchanged between the two cells via wired link between base stations, and then forwarded to the two UEs by each cell.
  • Fig. 8 is a flow chart showing the process of the UE requesting for relaying, for example UEl;
  • Fig. 9 is a flow chart showing the process of a relaying candidate, for example UE2;
  • Fig. 10 is a flow chart showing the process of the base station in a cell which the UE requesting for relaying is camping on, for example base station 1 in CELL 1;
  • Fig. 11 is a flow chart showing the process of the base station of a relaying candidate cell, base station 2 in CELL 2 for example.
  • the following assumptions are made: 1.
  • the UE requesting for relaying (UEl) is camping on CELL 1 and has conventional uplink/downlink communication with base station 1 of the CELL 1, but data transmission rate of the conventional uplink/downlink communication cannot satisfy UEl 's demands.
  • UEl has requested for relaying to increase data transmission rate, but failed to find any qualified relaying device in CELL 1 on which it is camping.
  • CELL 1 has several neighboring cells, e.g. CELL 2, CELL 3, etc.. These cells may work in different frequency bands, e.g. fl, f2, f3, etc., configured by the network.
  • Base station 1 and base stations of these neighboring cells may connect to one or several radio network controllers (RNC).
  • RNC radio network controllers
  • relaying probing channel For broadcasting and listening to relaying probing messages.
  • Each cell that can support inter-cell relaying may broadcast relevant system information such as relaying probing channel identity, the format of relaying probing message, initial sending power of probing message and so on. Therefore UEs can scan the relaying probing channels periodically to detect possible relaying request.
  • a UE requesting for relaying must be granted by the base station thereof before it can use a relaying probing channel to broadcast relaying probing message.
  • UEl After establishment of the communication, UEl keeps conventional communication with base station 1, and regularly measures and monitors data transmission rate, as shown in step S802.
  • UEl decides whether the average data transmission rate (Rl) over a certain period of time is less than its lowest acceptable data rate threshold (R_L0W) as shown in step S803. If Rl is larger than or equal to R_L0W, UEl keeps its original communication with base station 1, i.e. returns to step S802. If Rl is less than R_LOW, the flow goes to step S804. In this step, UEl tries to establish two-hop relaying communication inside CELL 1.
  • R_L0W lowest acceptable data rate threshold
  • UEl If UEl successfully establishes two-hop relaying communication inside CELL 1, UEl enters relaying state as shown in steps S805 and S806.
  • UEl fails to establish two-hop relaying communication inside CELL 1, UEl tries inter-cell relaying communication as shown in steps S805 and S807.
  • UEl sends an INITIAL_INTERCELL_RELAYING_REQUEST message to base station 1 of CELL 1 on which UEl is camping.
  • This message contains UEl 's identity, its expected data transmission rate (R_EXP) and pilot signal power level table of neighboring cells (RXLEV2, RXLEV3, etc.).
  • R_EXP expected data transmission rate
  • RXLEV2, RXLEV3, etc. pilot signal power level table of neighboring cells
  • this message may also include UEl 's current position information.
  • R_EXP is larger than the threshold R_L0W. Then, UEl waits for response from base station 1. If UEl receives the
  • UEl If UEl receives the CANDID ATE_RELAYING_CELL_INFO message from base station 1, UEl extracts the information of candidate cell(s). Then, UEl tunes to the frequency band of a candidate cell, and broadcasts an
  • INTERCELL_RELAYING_ROUTE_REQUEST message to the surrounding areas of the candidate cell on the reserved relaying probing channel of the candidate cell, using initial relaying probing transmission power, just as shown in steps S8O8 and S809.
  • This message contains UEl 's identity and its expected data transmission rate (R_EXP).
  • UEl performs the above-mentioned procedure one by one for every candidate cell, that is, tunes to the frequency band of a candidate cell, and broadcasts an INTERCELL_RELAYING_ROUTE_REQUEST message to the surrounding areas of the candidate cell on the reserved relaying probing channel of the candidate cell, using initial relaying probing transmission power.
  • UEl waits for response from base station 1 as shown in step S810. If UEl receives the INTERCELL_RELAYING_ROUTE_INDICATION message from base station 1, UEl extracts relaying route information from the message, tunes to the radio frequency band of best relaying cell, and negotiates with best relaying UE to establish P2P link on an assigned radio channel, as shown in steps S811, S812 and S813.
  • UEl starts inter-cell two-hop relaying communication relayed by the best relaying UE, and keeps on monitoring control channel with base station 1.
  • UEs camping on candidate relaying cell(s) in the vicinity of UEl may receive the INTERCELL_RELAYING_ROUTE_REQUEST message from UEl by scanning relaying probing channel, as shown in step S901. If a UE is not willing to or capable of relaying, it does not respond to the
  • a UE If a UE is willing to and capable of relaying, it estimates available data transmission rates for the P2P link with UEl (R12) and for the conventional link with its camping base station (R2), based on signal-to-interference-ratio (SIR), available radio resources and other information related to channel quality, as shown in steps S902 and S903.
  • SIR signal-to-interference-ratio
  • R_MIN is larger than or equal to R_EXP, the UE sends a
  • CANDID ATE_INTERCELL_RELAYING_REPORT message to its base station as shown in steps S904 and S905.
  • This message contains the identities of UEl and the UE, and estimated available data transmission rate R_MIN.
  • each UE willing to and capable of relaying sends the above CANDID ATE_INTERCELL_RELAYING_REPORT message to the base stations of their camping cells, respectively.
  • each UE waits for indication from their respective camping cells as shown in step S906.
  • INTERCELL-RELAYING-ROUTEJNDICATION message from its base station over a certain period of time, it stops relaying attempt and returns to its original state, as shown in steps S907 and S908. If a candidate UE receives the INTERCELL_RELAYING_ROUTE_INDICATION message from its base station over a certain period of time, it extracts related information from the message and negotiates with UEl to establish P2P link on an assigned radio channel and establish conventional link with its base station, just as shown in steps S907, and S909-S911.
  • the best relaying UE When both links are established, the best relaying UE provides relaying for the inter-cell two-hop relaying communication, as shown in step S912. Reference is now given to Fig. 10. On receiving the
  • base station 1 extracts from the message the identity of UEl and its expected data transmission rate R_EXP, as shown in steps SlOOl and S 1002.
  • step S 1003 base station 1 prepares an empty candidate relaying cell list to record the identities of its neighboring cells that can be used for inter-cell relaying, and base station 1 negotiates with its neighboring cells via RNC to select a set of candidate cells for inter-cell relaying according to the following criteria:
  • a candidate cell should support inter-cell relaying functions; b) A candidate cell should be able to reserve sufficient radio resources for relaying to satisfy UEl 's expected data transmission rate R_EXP; c) A candidate cell should not be too far from UEl requesting for relaying to establish stable relaying communication. More specifically, base station 1 should compare pilot signal power level RXLEV2, RXLEV3, etc. of each neighboring cell received by UEl with a minimum level RXLEV_MIN. The pilot signal power level of a candidate cell should satisfy: RXLEV ⁇ RXLEV _ MIN .
  • base station 1 may also select candidate cells according to the geographic locations of neighboring base stations specified by network planning, and the current position of UEl. For example, base station 1 can utilize Global Position System (GPS) or other location estimation techniques to calculate the relative distance between UEl and the base station of a neighboring cell. Base station 1 decides whether each neighboring cell can be a candidate relaying cell. Each neighboring cell satisfying the above criteria will be selected by base station 1 as a candidate relaying cell, and the identity thereof is added into candidate relaying cell list, just as shown in steps S1004-S1009.
  • GPS Global Position System
  • base station 1 decides whether the candidate relaying cell list is empty, as shown in step SlOlO.
  • base station 1 sends to UEl an INTERCELL_RELAYING_REJECT message indicating that inter-cell relaying communication cannot be performed, and returns to its original connection state, just as shown in steps SlOIl and S1012.
  • base station 1 If the candidate relaying cell list is not empty, base station 1 notifies the base station of each candidate relaying cell to prepare for inter-cell relaying, and prepares for UEl a candidate relaying UE list to record information of possible candidate relaying UEs delivered from candidate cells, just as shown in steps S1013 and S1014.
  • step S 1015 base station 1 sends to UEl a
  • CANDID ATE_RELAYING_CELL_INFO message contains the candidate relaying cell list together with the radio frequency band and reserved relaying probing channel information of each candidate relaying cell.
  • step S1016 base station 1 waits for relaying information from candidate relaying cells.
  • base station 1 If base station 1 does not receive information of best candidate relaying UE from the base stations of each candidate cell over a certain period of time, it will send the INTERCELL_RELAYING_REJECT message to UEl to indicate that inter-cell relaying communication cannot be performed, and returns to its original state, just as shown in steps S1017, SlOIl and S1012.
  • base station 1 If base station 1 receives information of best candidate relaying UE from the base station(s) of one or more candidate relaying cells over a certain period of time, it will record the identity of each candidate relaying UE and corresponding available data transmission rate R_MAX (cell j) into the candidate relaying UE list prepared for UEl, as shown in step S 1018.
  • step S 1020 after base station 1 receives information of best candidate relaying UEs from all candidate relaying cells, it compares the available data rates of all candidate relaying UEs to select a best relaying UE with the maximum available data transmission rate as the relaying device, i.e. selects a relaying device according to:
  • R _ MAX max ⁇ R _ MAX (cell j) ⁇ where j is the index of a candidate cell, and C is the set of candidate cells.
  • base station 1 After selecting a best relaying UE for UEl, base station 1 notifies the base station of the best relaying UE to reserve radio resources for relaying, waits for response from the base station, and notifies base stations of other candidate cells that they are not selected for relaying to make them return to their original states, just as shown in step S 1021.
  • base station 1 waits for the message indicating whether radio resources allocation is successful from the base station of the relaying UE.
  • base station 1 If radio resources allocation at the best relaying cell is not successful, base station 1 sends an INTERCELL_RELAYING_REJECT message to UEl to indicate that inter-cell relaying communication can not be performed, and returns to its original state, just as shown in steps S1022, SlOIl and S1012.
  • the system can also be set such that after failure of radio resources allocation at the best relaying cell, one cell is selected from other candidate relaying cells as a best relaying cell for radio resources allocation. If radio resources allocation at the best relaying cell is successful, base station 1 sends an INTERCELL-RELAYING-ROUTEJNDICATION message to UEl, indicating that inter-cell relaying communication can be performed.
  • This message contains the identity information about the base station of the best relaying cell and about the best relaying UE, as well as allocated radio resources, just as shown in steps S 1022 and S 1023.
  • base station 1 keeps the control link with UEl as shown in step S 1024.
  • base stations of cells in the vicinity of CELL 1 may receive a relaying request from base station 1 of CELL 1.
  • these base stations On receiving the relaying request message from base station 1, these base stations begin to negotiate with base station 1 to know if they can become relaying cells respectively, just as shown in steps SIlOl and S 1102.
  • a cell has not been selected as relaying cell for relaying UEl, its base station returns to its original state as if it has not received the relaying request message, just as shown in steps S 1103 and Sl 111. If a cell has been selected as relaying cell for relaying UEl, its base station prepares an empty candidate relaying UE list Ll for UEl, just as shown in steps S 1103 and S 1104.
  • the base station waits for candidate relaying UE's report from its own UEs as shown in step S 1105.
  • a base station receives CANDIDATEJNTERCELL-RELAYING-REPORT message(s) from its UEs, including one or more UEs, the base station extracts the identity information and estimated available data transmission rate R_MIN from its UEs which can serve as relaying candidates, and records the information into its candidate relaying UE list Ll, just as shown in steps S 1106 and S 1108.
  • step SlIlO after receiving one or several
  • the base station selects the best candidate UE with the maximum available data transmission rate according to:
  • R _ MAX (cell j) max ⁇ min ⁇ R2(i), R12(i) ⁇ I R2(i) ⁇ R _ EXP, R12(i) ⁇ R _ EXP ⁇
  • j is the index of a candidate cell
  • S j is the set of candidate relaying UE of cell j
  • i is the index of candidate relaying UE
  • R2(i) is the estimated available data transmission rate of conventional link between candidate relaying UEi and corresponding base station thereof
  • R12(i) is the estimated available data rate of P2P link between candidate relaying UEi and UEl;
  • R_EXP is the expected data transmission rate of UEl requesting for relaying.
  • the base station delivers to base station 1 the information about the best candidate relaying UE under its management, together with the available data transmission rate R_MAX(cell j), and waits for response from base station 1, as shown in S1112.
  • base station of the cell stops relaying procedures and returns to its original state, just as shown in steps S1113 and Sllll.
  • base station of the cell performs radio resources allocation under the control of the RNC for the inter-cell two-hop relaying communication, just as shown in steps S1113 and S1114.
  • the base station of the best relaying UE notifies base station 1 of information about unsuccessful resources allocation, stops relaying procedures, and returns to its original state, just as shown in steps S1115, S1120 and Sllll.
  • the base station of the best relaying UE notifies base station 1 of the information about radio resources allocation, sends an INTERCELL-RELAYING-ROUTEJNDICATION message to the best relaying UE.
  • This message contains radio resources information assigned for the two-hop relaying communication, just as shown in steps S1115-S1117.
  • the base station of the best relaying UE establishes conventional link with this best relaying UE and starts inter-cell two-hop relaying communication, as shown in steps S1118 and S1119.
  • base station 1 the base station of best relaying cell, base station 2 for example, and UEl should respectively do the following:
  • Base station 1 is no longer in charge of traffic data for UEl, and hence can release traffic channel for UEl. But base station 1 should still maintain control channel for UEl and exchange control information regarding UEl with base station 2.
  • Base station 2 should be in charge of the traffic forwarding between UEl and Core Network. Base station 2 only communicates with best relaying UE, for example UE2, via traffic and control channels, and has no direct link with UEl. In case base station 2 needs to send control information to UEl, base station 2 may forward this information to base station 1, and then base station 1 will forward this information to UEl via control channel in CELL l.
  • UEl works in the frequency band of best relaying cell and communicates only with UE2 via P2P traffic and control channels. Meanwhile, UEl also periodically monitors its original control channel with base station 1 to exchange control information with base station 1 at the frequency band of CELL 1.
  • inter-cell two-hop relaying communication might be unstable due to mobility effect of relaying device and UEl. In case UEl detects that the inter-cell two-hop relaying communication become unsatisfactory, UEl may negotiate with base station 1 to perform handover procedures to another two-hop relaying communication from the current two-hop relaying communication, or switch back to conventional communication with base station 1.
  • inter-cell two-hop relaying communication scheme can benefit traffic load distribution of a multi-cell communication system.
  • inter-cell two- hop relaying communication may divert part of load to neighboring cells that have available radio resources and appropriate relaying UEs.
  • Fig.12 is a schematic diagram showing the corresponding functional units in a UE according to the present invention.
  • the UE1200 comprises: a P2P communication unit 1203, for performing P2P communication with another UE; a conventional communication unit 1204, for performing conventional uplink/downlink communication with a base station; an estimating unit 1202, for estimating data transmission rate of links; a controlling unit 1201, for controlling the estimating unit 1202, the P2P communication unit 1203 and the conventional communication unit 1204; and a forwarding unit 1205 for, under the control of the controlling unit 1201, forwarding traffic data from the P2P communication unit 1203 to the conventional communication unit 1204, and vice versa, so that another UE' s traffic received via P2P link can be forwarded to a base station, and vice versa.
  • Fig. 13 is a schematic diagram showing the functional units of an apparatus of establishing two-hop relaying communication in a wireless communication system.
  • the apparatus 1300 is at the UTRAN.
  • the apparatus 1300 comprises: receiving means 1301, for receiving a two-hop relaying communication request; determining means 1302, for determining a UE as a relaying device after the receiving means 1301 receives the two-hop relaying communication request; and link establishing means 1303, for establishing corresponding links so as to enable two-hop data transmission be performed via the relaying device, if the determining means 1302 determines a relaying device.

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

Abstract

L'invention concerne une méthode et un appareil pour établir une communication de relais à deux sauts dans un système de communication sans fil. Cette méthode comprend les étapes consistant à: recevoir, à partir d'un premier équipement utilisateur (EU), une demande pour communiquer avec un dispositif de communication par un relais multisaut; sélectionner un second EU en tant que dispositif de relais, selon un critère prédéfini; et établir des liaisons correspondantes pour faire communiquer le premier EU avec le dispositif de communication par le relais du second EU. Selon la méthode et l'appareil de l'invention, des routes de relais spécifiées peuvent satisfaire les exigences des utilisateurs à une haute vitesse de transmission de données.
PCT/IB2006/051902 2005-06-17 2006-06-14 Methode et appareil pour etablir une communication de relais a deux sauts dans des systemes de communication sans fil WO2006134562A2 (fr)

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