WO2011149307A2 - Appareil et procédé de réalisation ou de prise en charge d'une communication coopérative entre terminaux dans un système de communication sans fil - Google Patents

Appareil et procédé de réalisation ou de prise en charge d'une communication coopérative entre terminaux dans un système de communication sans fil Download PDF

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Publication number
WO2011149307A2
WO2011149307A2 PCT/KR2011/003908 KR2011003908W WO2011149307A2 WO 2011149307 A2 WO2011149307 A2 WO 2011149307A2 KR 2011003908 W KR2011003908 W KR 2011003908W WO 2011149307 A2 WO2011149307 A2 WO 2011149307A2
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WIPO (PCT)
Prior art keywords
terminal
cooperative communication
terminals
cooperative
base station
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PCT/KR2011/003908
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English (en)
Korean (ko)
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WO2011149307A3 (fr
Inventor
박규진
조한규
임동국
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엘지전자 주식회사
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Priority to KR1020127030871A priority Critical patent/KR20130082447A/ko
Priority to US13/700,019 priority patent/US20130064213A1/en
Publication of WO2011149307A2 publication Critical patent/WO2011149307A2/fr
Publication of WO2011149307A3 publication Critical patent/WO2011149307A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to an apparatus and a method for performing or supporting cooperative communication between terminals.
  • Machine to Machine literally means communication between an electronic device and an electronic device. Broadly, it means wired or wireless communication between electronic devices, or communication between a device controlled by a person and a machine. However, in recent years, a general term refers to wireless communication between an electronic device and an electronic device, that is, between devices.
  • M2M communication In the early 1990s, when the concept of M2M communication was first introduced, it was recognized as a concept of remote control or telematics, and the market itself was very limited.However, in the last few years, M2M communication has grown rapidly and attracted attention not only in Korea but also worldwide. Growing into the receiving market. In particular, intelligent metering that measures flow management, remote monitoring of machinery and equipment, operating hours on construction machinery and automatic measurement of heat or electricity usage in point-of-sales and security-related applications. It showed great influence in the field of (Smart Meter). In the future, M2M communication will be used for more various purposes in connection with existing mobile communication and wireless high-speed Internet, or low-power communication solutions such as Wi-Fi and Zigbee, and it will no longer be limited to the B2B market. Will be.
  • M2M communication era data can be sent and received to and from any machine equipped with a SIM card for remote management and control.
  • M2M communication technology can be used in numerous devices and equipment such as automobiles, trucks, trains, containers, vending machines, gas tanks, and the like.
  • An object of the present invention is to provide a method for performing cooperative communication between terminals in a wireless communication system.
  • Another technical problem to be achieved in the present invention is to provide a method for supporting cooperative communication between terminals in a wireless communication system.
  • Another object of the present invention is to provide a terminal for performing cooperative communication between terminals in a wireless communication system.
  • Another technical problem to be achieved in the present invention is to provide a base station for supporting cooperative communication between terminals in a wireless communication system.
  • a method for performing cooperative communication between terminals includes: identifier information of at least one second terminal linked with the first terminal and the second terminal; Transmitting to the base station a first message requesting the cooperative communication including at least one of information on a mode of performing cooperative communication of the cooperative communication; And receiving, from the base station, a second message including identifier information of at least one third terminal to perform cooperative communication among the second terminals, wherein the network linked between the first and second terminals is selected from the first and second terminals.
  • the terminal and the base station are heterogeneous with the linked network.
  • a method for performing cooperative communication between terminals transmitting, to the base station, a first message including at least one of information for enabling direct link connection with the first terminal by one or more candidate terminals capable of cooperative communication in a cell to which the cell belongs. And receiving, from the base station, a second message including identifier information of at least one second terminal to perform cooperative communication among the candidate cooperative terminals, wherein the network linked between the first terminal and the candidate terminal is the The first terminal and the base station are heterogeneous with the linked network.
  • a method for supporting inter-terminal cooperative communication wherein the identifier information of at least one second terminal linked with the first terminal and the first terminal are the same.
  • a network linked between the second terminal is heterogeneous with a network to which the first terminal and the base station are linked.
  • a method for supporting inter-terminal cooperative communication wherein the identifier information of at least one second terminal linked with a first terminal and the first terminal Receiving from the first terminal a first message requesting the cooperative communication, including at least one of information on a mode for performing cooperative communication with the second terminal; And grouping a cooperative terminal to perform cooperative communication with the first terminal based on at least one of identifier information of the one or more second terminals and information about a mode of performing the cooperative communication.
  • a network linked between the second terminal is heterogeneous with a network to which the first terminal and the base station are linked.
  • a method for supporting cooperative communication between terminals including: identifier information of a first terminal and cooperative communication in a cell to which the first terminal belongs. Receiving a first message from the first terminal, the first message including at least one of information for enabling a direct link connection with the first terminal and information on a mode in which the first terminal performs cooperative communication.
  • Doing Transmitting, to the at least one candidate terminal, a connection request message of a direct link with the first terminal including at least one of identifier information of the first terminal and information about a mode in which the first terminal performs cooperative communication; Including, The network linked between the first terminal and the candidate terminal is heterogeneous with the network to which the first terminal and the base station is linked.
  • the method may further include receiving information indicating whether the requested cooperative communication can be performed from the one or more candidate terminals.
  • the method may further include determining at least one cooperative terminal to perform cooperative communication with the first terminal based on the information indicating whether the cooperative communication can be performed.
  • the method may further include transmitting identifier information of the cooperative terminal determined to perform the cooperative communication to the first terminal.
  • the method may further include transmitting a message confirming that the cooperative communication is performed to the cooperative terminal determined to perform the cooperative communication.
  • a first terminal configured to perform cooperative communication with the second terminal and identifier information of one or more second terminals to which the first terminal is linked.
  • the terminal and the base station are heterogeneous with the linked network.
  • a first terminal includes information about its identifier, a mode for performing cooperative communication to which the first terminal belongs, and a cell to which the first terminal belongs.
  • a receiver for receiving a second message from the base station, the second message including identifier information of at least one second terminal to perform the cooperative communication among the candidate cooperative terminals, wherein the network linked between the first terminal and the candidate terminal is the first terminal.
  • the terminal and the base station are heterogeneous with the linked network.
  • identifier information of at least one second terminal linked to the first terminal and the first terminal is a cooperative communication with the second terminal
  • a processor configured to group a cooperative terminal to perform cooperative communication with the first terminal based on at least one of identifier information of the at least one second terminal and information about a mode of performing the cooperative communication.
  • a network linked between the second terminal is heterogeneous with a network to which the first terminal and the base station are linked.
  • the base station the identifier information of the first terminal, at least one candidate terminal capable of cooperative communication in the cell to which the first terminal belongs to the first
  • a receiver for receiving a first message from the first terminal, the first message including at least one of information enabling a direct link connection with a first terminal and information about a mode in which the first terminal performs cooperative communication;
  • Transmitter for transmitting a direct link connection request message with the first terminal including at least one of the identifier information of the first terminal and the information on the mode in which the first terminal performs cooperative communication to the at least one candidate terminal.
  • the network linked between the first terminal and the candidate terminal is heterogeneous with the network to which the first terminal and the base station is linked.
  • communication performance such as throughput enhancement and power consumption, may be significantly improved through cooperative communication between terminals.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100,
  • FIG. 2 is a diagram illustrating an example of a process in which a terminal performs initial network entry
  • FIG. 3 is a diagram illustrating an example of a process for performing client cooperation (CC) between terminals;
  • FIG. 4 is a view showing another example of a process for performing cooperative communication (Client Cooperation, CC) between terminals, and,
  • FIG. 5 is a diagram illustrating another example of a process for performing cooperative communication (Client Cooperation, CC) between terminals.
  • Client Cooperation CC
  • the terminal refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), an M2M terminal, an HTC terminal, a notebook computer, a tablet PC, and the like.
  • UE user equipment
  • MS mobile station
  • AMS advanced mobile station
  • M2M terminal an HTC terminal
  • notebook computer a tablet PC
  • the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
  • UE user equipment
  • MS mobile station
  • AMS advanced mobile station
  • M2M terminal an M2M terminal
  • HTC terminal notebook computer
  • tablet PC tablet PC
  • AP Access Point
  • a user equipment may receive information from a base station through downlink, and the terminal may also transmit information through uplink.
  • the information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • the wireless communication system 100 may include one or more base stations and / or one or more terminals. .
  • the base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185, and a receiver ( 190, a symbol demodulator 195, and a receive data processor 197.
  • the terminal 110 transmits (Tx) the data processor 165, the symbol modulator 175, the transmitter 175, the transmit / receive antenna 135, the processor 155, the memory 160, the receiver 140, and the symbol. It may include a demodulator 155 and a receive data processor 150.
  • the base station 105 and the terminal 110 are provided with a plurality of transmit and receive antennas. Accordingly, the base station 105 and the terminal 110 according to the present invention support a multiple input multiple output (MIMO) system. In addition, the base station 105 according to the present invention may support both a single user-MIMO (SU-MIMO) and a multi-user-MIMO (MU-MIMO) scheme.
  • MIMO multiple input multiple output
  • SU-MIMO single user-MIMO
  • MU-MIMO multi-user-MIMO
  • the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the symbols ("data"). Symbols ").
  • the symbol modulator 120 receives and processes these data symbols and pilot symbols to provide a stream of symbols.
  • the symbol modulator 120 multiplexes the data and pilot symbols and sends them to the transmitter 125.
  • each transmission symbol may be a data symbol, a pilot symbol, or a signal value of zero.
  • pilot symbols may be sent continuously.
  • the pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.
  • Transmitter 125 receives a stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency up-converts) these analog signals, A downlink signal suitable for transmission over a wireless channel is generated, and then the transmitting antenna 130 transmits the generated downlink signal to the terminal.
  • the receiving antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140.
  • Receiver 140 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples.
  • the symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.
  • the symbol demodulator 145 also receives a frequency response estimate for the downlink from the processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is an estimate of the transmitted data symbols). Obtain and provide data symbol estimates to a receive (Rx) data processor 150. Receive data processor 150 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
  • the processing by symbol demodulator 145 and receiving data processor 150 is complementary to the processing by symbol modulator 120 and transmitting data processor 115 at base station 105, respectively.
  • the terminal 110 is on the uplink, and the transmit data processor 165 processes the traffic data to provide data symbols.
  • the symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175.
  • the transmitter 175 receives and processes a stream of symbols to generate an uplink signal.
  • the transmit antenna 135 transmits the generated uplink signal to the base station 105.
  • an uplink signal is received from the terminal 110 through the reception antenna 130, and the receiver 190 processes the received uplink signal to obtain samples.
  • the symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink.
  • the received data processor 197 processes the data symbol estimates to recover the traffic data transmitted from the terminal 110.
  • the processor 155 of the terminal 110 and the processor 180 of the base station 105 instruct (eg, control, coordinate, manage, etc.) the operation in the terminal 110 and the base station 105, respectively.
  • Respective processors 155 and 180 may be connected to memories 160 and 185 that store program codes and data.
  • the memory 160, 185 is coupled to the processor 155, 180 to store operating systems, applications, and general files.
  • the processors 155 and 180 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, or the like.
  • the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention.
  • the firmware or software configured to be may be provided in the processors 155 and 180 or stored in the memory 160 and 185 to be driven by the processors 155 and 180.
  • the layers of the air interface protocol between the terminal and the base station between the wireless communication system (network) are based on the lower three layers of the open system interconnection (OSI) model, which is well known in the communication system. ), And the third layer L3.
  • the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
  • a Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network.
  • the terminal and the base station may exchange RRC messages through the wireless communication network and the RRC layer.
  • the present invention proposes a terminal-to-terminal grouping scheme for supporting client-to-device cooperative communication (CC) in a wireless communication system.
  • CC client-to-device cooperative communication
  • a direct link between terminals performing client cooperation between terminals is a heterogeneous network (for example, WiFi) that is different from a cellular network between the terminal and the base station.
  • WiFi heterogeneous network
  • a terminal grouping scheme for supporting cooperative communication between terminals for example, an example of a direct link between terminals is described with WiFi, but is not limited thereto.
  • terminals that are subjects of cooperative communication between terminals are referred to as source terminals or source nodes and cooperative terminals or cooperative nodes, respectively.
  • the source terminal refers to a terminal that is a subject of data transmission and reception with the base station and / or the repeater
  • the cooperative terminal refers to a terminal that helps data transmission and reception between the source terminal and the base station and / or the repeater.
  • the process of cooperative communication between terminals consists of a grouping of the source terminal and the cooperative terminal, data sharing through direct communication between the source terminal and the cooperative terminal, and a data transmitting / receiving step between the base station and the source terminal and the cooperative terminal.
  • This may be different for each cooperative communication mode (or scenario).
  • one or more source terminals and a cooperative terminal may be respectively configured, and roles of the source terminal and the cooperative terminal may be dynamically changed between the grouped terminals. This will be described later.
  • the present invention proposes a method for grouping between terminals when direct link communication between terminals for cooperative communication (client cooperation) uses a WiFi or WiFi ad-hoc mode.
  • an efficient and simple terminal grouping can be configured by sharing identifier information (for example, address information on a WiFi network) on a network with a base station of a cellular network for each terminal.
  • identifier information for example, address information on a WiFi network
  • the present invention is described based on the IEEE 802.16 series wireless communication system, the same can be applied to various wireless mobile communication systems of the same type (for example, the 3GPP LTE series system).
  • the terminal Before performing cooperative communication between terminals, the terminal needs to enter the network and register with the network. Next, the process of entering the network by the terminal will be briefly described with reference to FIG. 2.
  • FIG. 2 is a diagram illustrating an example of a process in which a terminal performs initial network entry.
  • the terminal transmits initial ranging to the base station (S205).
  • Initial ranging is a process for the UE to obtain an accurate timing offset with the base station and to initially adjust the transmission power.
  • the terminal acquires downlink synchronization using a downlink preamble signal received from the base station.
  • the terminal performs initial ranging to adjust uplink timing offset and transmit power.
  • the terminal selects the ranging preamble code from the initial ranging domain, and transmits the selected ranging preamble code to the base station through the selected ranging channel (S205).
  • the base station may transmit an acknowledgment response message (for example, an AAI-RNG-ACK message) for the initial ranging of the terminal to the terminal (S210).
  • the AAI-RNG-ACK message is a message that provides a response that all ranging preamble codes have been successfully received and detected at all ranging opportunities.
  • the base station may transmit three possible ranging states for initial ranging in the AAI-RNG-ACK message to the terminal.
  • three possible ranging states included in the AAI-RNG-ACK message include a "continue” state, a "success” state, and an "abort" state.
  • the base station may transmit a CDMA Allocation A-MAP IE (CDMA Allocation A-MAP IE) message to inform the UE of information necessary for transmitting the AAI-RNG-REQ message instead of the AAI-RNG-ACK message.
  • CDMA Allocation A-MAP IE CDMA Allocation A-MAP IE
  • the terminal may transmit a message (eg, an AAI-RNG-REQ message) requesting ranging to the base station through the allocated resource (S215). Then, the base station transmits a message (for example, AAI-RNG-RSP message) confirming that the ranging request message has been received to the terminal (S220). In the case of a system to which HARQ operation is applied, the terminal may transmit a message (for example, an AAI-SBC-REQ message) requesting this to the base station in order to negotiate basic capability (S225). The base station may transmit a message (for example, an AAI-SBC-RSP message) confirming reception of the AAI-SBC-REQ message to the terminal in response to the reception of the AAI-SBC-REQ message (S230).
  • a message eg, an AAI-RNG-REQ message
  • the terminal may transmit a message (for example, an AAI-RNG-REQ message) confirming that the ranging request message has been received to the
  • the terminal may transmit a message (for example, an AAI-REG-REQ message) for capability negotiation and registration to the network at the time of network entry (S235), and the base station is AAI-REG.
  • a message for example, an AAI-REG-RSP message
  • the terminal completes the entry of the network to which the base station belongs by performing such a series of processes.
  • All terminals capable of cooperative communication are WiFi-capable during terminal capability negotiation during initial network entry, handover, or network re-entry from the idle mode to the active mode. Or an identifier (e.g., MAC address or IP address) on that WiFi network with an information area indicating the supportability for WiFi ad hoc mode (for example a bitmap scheme using 1 bit can be used for this). Information area including the ") can be transmitted to the base station.
  • each terminal sends information indicating the supportability for the WiFi or WiFi ad hoc mode to the base station in the form of an existing AAI-RNG-REQ, AAI-SBC-REQ, or AAI-REG-REQ message type.
  • MAC management message defined as a new type rather than an existing defined message type.
  • This new type of MAC management message is referred to herein as an 'AAI-CC-CNF' message, but is not limited to this reference and may also be called other names.
  • the base station may configure a table by mapping WiFi MAC addresses or IP addresses of all terminals capable of cooperative communication with a STID (Station ID) of the corresponding terminal in a 1: 1 manner. That is, the base station may distinguish each terminal by mapping the STID allocated to each terminal and the WiFi MAC address or IP address transmitted while each terminal enters an initial network.
  • the base station may use the configured table for terminal grouping for cooperative communication.
  • a table in which a WiFi MAC address or an IP address is mapped 1: 1 with a STID (Station ID) of a corresponding terminal may be defined in advance.
  • the STID of the terminal is an identifier assigned to the base station for each terminal upon initial network entry. If the WiFi MAC address or IP address is changed later, each terminal may signal the base station and share the changed information with the base station.
  • FIG. 3 is a diagram illustrating an example of a process for performing client cooperation (CC) between terminals.
  • the source terminal may request cooperative communication from the base station (S310). Such a request for client cooperation may be transmitted from the source terminal to the base station in the form of a MAC management message.
  • the corresponding MAC management message for a client cooperation request is referred to as an 'AAI-CC-REQ' message, but is not limited to this title alone.
  • the source terminal Before the source terminal transmits the AAI-CC-REQ message, the source terminal performs the WiFi MAC address or IP address of the terminals connected to the WiFi ad-hoc link through a neighbor terminal search process in the WiFi or WiFi ad-hoc mode. Can be identified.
  • the source terminal may include the WiFi MAC address or IP address information of the terminals connected to the secured WiFi ad-hoc link in the AAI-CC-REQ message and transmit the same to the base station (S310).
  • the source terminal may transmit channel state information of the WiFi ad-hoc link of each of the terminals to which the WiFi ad-hoc link is additionally included in the AAI-CC-REQ message to the base station (S310).
  • the source terminal may transmit information including the information on the objective of the client cooperation request in the AAI-CC-REQ message to the base station (S310). That is, the source terminal instructs the base station of the desired cooperative communication mode (client cooperation) mode among the various cooperative communication modes, so that the base station can know the purpose of the terminal to cooperate.
  • the base station may inform the base station whether to minimize power consumption of the terminal or to improve throughput of the terminal for the purpose of requesting client cooperation of the source terminal. It is also possible to inform the preference of the terminal between simultaneous transmission of the source terminal and the cooperative terminal and transmission by only the cooperative terminal for the purpose of requesting client cooperation of the source terminal. Or, even if the information on the uplink and downlink, or additionally, even if the cooperation of the uplink may also transmit a request of the terminal whether to receive help from the cooperative terminal through the cooperation of the downlink system information.
  • the processor 180 of the base station may group the cooperative terminals to perform cooperative communication with the source terminal (S320).
  • the processor 180 of the base station may group the terminals in consideration of the cooperative communication purpose (or cooperative communication mode) requested by the source terminal, the link state between the source terminal and the cooperative terminal, and the link state between the base station and the cooperative terminal ( S320). For example, when the cooperative communication request mode requested by the source terminal is a mode for power saving, the base station gives more weight to the distance between the source terminal than the channel state between the cooperative terminal and the base station, and thus the adjacent terminal close to the source terminal. Can be grouped into a cooperative terminal.
  • the processor 180 of the base station considers the channel state between the cooperative terminal and the base station and is adjacent to the source terminal among the terminals having good channel conditions.
  • the terminal may be determined to be a cooperative terminal.
  • elements used by the processor 180 of the base station to determine and group the cooperative terminals may be different according to the cooperative communication mode requested by the source terminal. That is, the processor 180 of the base station may consider the distance between the source terminal and the channel state between the cooperative terminal and the base station in grouping the source terminal and the cooperative terminal.
  • the base station may transmit the identifier information (for example, WiFi MAC address or IP address) of the grouped cooperative terminals to the source terminal requesting cooperative communication through the AAI-CC-RSP message (S340). Or, the base station may send only the ACK signal for the request to the terminal requesting the cooperation (Sclient cooperation) (S340). Accordingly, the source terminal may obtain information about one or more grouped cooperative terminals that have performed cooperative communication with the source terminal.
  • the identifier information for example, WiFi MAC address or IP address
  • the base station before transmitting the identifier information of the grouped cooperative terminal or the ACK signal for the cooperative communication request (S340), the base station notifies the one or more grouped cooperative terminals to perform cooperative communication (client cooperation) for the source terminal. May transmit the message (S330).
  • the message for notifying the cooperative communication may be referred to as an AAI-CC-IND message, but is not limited thereto.
  • the base station may instruct the cooperative terminal to perform cooperative communication for the source terminal by transmitting identifier information (for example, WiFi MAC address or IP address) of the source terminal through the AAI-CC-IND message (S330). .
  • the base station may further include information on the cooperative communication mode (client cooperation mode) requested by the source terminal in the AAI-CC-IND message (S330).
  • the information on the cooperative communication mode is the source terminal relays uplink data to the close cooperative terminal to reduce power to request a mode for the cooperative terminal to transmit the uplink data to the base station, throughput enhancement (throughput enhancement) It may include various information about whether the cooperative terminal and the source terminal requests to perform in the cooperative communication mode for performing cooperative transmission.
  • the base station can also transmit the information about the cooperative communication mode to the source terminal if necessary.
  • FIG. 4 is a diagram illustrating another example of a process for performing client cooperation (CC) between terminals.
  • the source terminal may request cooperative communication from the base station (S410). This request for client cooperation is made through the ⁇ AAI-CC-REQ ⁇ message, but is not limited to this message alone.
  • the source terminal may transmit the WiFi MAC address or IP address of the terminals connected with the WiFi ad-hoc link to the AAI-CC-REQ message and information on the purpose of the client cooperation request to the base station. (S410).
  • the source terminal may further include channel state information of the WiFi ad-hoc link of each of the terminals to which the WiFi ad-hoc link is connected in the AAI-CC-REQ message (S410).
  • the processor 180 of the base station groups the cooperative terminals to perform cooperative communication with the source terminal, the cooperative communication purpose (or cooperative communication mode) requested by the source terminal, the link state between the source terminal and the cooperative terminal, and the base station
  • the terminal may be grouped in consideration of a link state between the terminal and the cooperative terminal (S420).
  • the base station before the base station transmits an AAI-CC-IND message to one or more terminals grouped together with the source terminal to perform cooperative communication, whether the base station performs cooperative communication with the source terminal to the cooperative terminal.
  • a message requesting whether or not may be transmitted (S430).
  • the base station may transmit the identifier information (for example, WiFi address (or IP address), cooperative communication mode, etc.) of the source terminal to one or more grouped cooperative terminals (S430).
  • the processor of the grouped one or more cooperative terminal may determine whether to perform cooperative communication for each source terminal (S440), and transmit the result thereof in the form of a response message to the base station (S450). .
  • the base station may transmit the identifier information of the cooperative terminal to perform cooperative communication (or allow cooperative communication) to the source terminal through the AAI-CC-RSP message (S460).
  • 3 and 4 may be performed at the request of the source terminal, or may be performed by the base station to initiate cooperative communication by itself for any terminal.
  • the base station needs to transmit a message instructing the cooperative communication to the source terminal requiring the cooperative communication.
  • FIG. 5 is a diagram illustrating another example of a process for performing cooperative communication (Client Cooperation, CC) between terminals.
  • Client Cooperation CC
  • a WiFi modem for discovering a neighboring terminal in a network (for example, WiFi) where a source terminal and a cooperative terminal are always connected between terminals, may be used.
  • Transceiver antenna, RF chain, etc. should be operated. However, this may cause unnecessary power consumption for the terminal.
  • terminals may perform WiFi ad-hoc communication only when client cooperation or direct communication between terminals is required. For example, as shown in FIG. 5, when a specific source terminal determines that cooperative communication is necessary, the AAI-CC-REQ message may be transmitted to the base station (S510).
  • the source terminal facilitates direct link connection through the AAI-CC-REQ message through its own identifier (WiFi MAC address or IP address) and candidate cooperative terminals capable of cooperative communication in the cell through the discovery of WiFi neighbor terminals with the corresponding source terminal.
  • Information timing, etc.
  • the purpose ie, cooperative communication mode
  • the base station receiving the AAI-CC-REQ message may transmit a message requesting one or more candidate cooperative terminals to perform a connection to a WiFi direct link for the corresponding source terminal (S520). That is, the base station may transmit a message requesting the candidate cooperative terminals to perform a search for the corresponding source terminal through the WiFi neighbor terminal discovery process (S520).
  • each candidate cooperative terminal may perform a search for a WiFi direct link with a source terminal requesting cooperative communication (S530), and report the search result and whether cooperative communication is possible to the base station (S530). There is (S540).
  • the processor 180 of the base station selects (or determines) the cooperative terminal to perform the cooperative communication based on a search result of the WiFi direct link transmitted by each candidate cooperative terminal and the cooperative communication availability indication information. It may be (S550).
  • the base station may transmit the identifier information (WiFi MAC address or IP address) of the selected (or determined) cooperative terminal to the source terminal through an AAI-CC-RSP message (S560).
  • the base station may transmit a confirmation message to perform a client cooperation to the selected cooperation terminal (S570).
  • the candidate cooperative terminal described above may be any terminal capable of cooperative communication in a cell.
  • the base station may set the cell-specific cooperative communication STID to facilitate message transmission to the candidate cooperative terminal. That is, during the network entry / re-entry process of the terminals, the base station may inform the terminals capable of cooperative communication by setting a cell-specific cooperative communication STID only for terminals capable of cooperative communication through a capability negotiation process.
  • the cell-specific cooperative communication STID configured as described above is used when a specific source terminal requests cooperative communication, or when a base station requests cooperative communication for a specific terminal, the base station cooperates for the source terminal using the cell-specific cooperative communication STID.
  • Information for multi-casting a message for cooperating terminals capable of performing communication may be transmitted.
  • the base station may transmit a CRC masked control channel (eg, A-MAP-IE) to the cell-specific cooperative communication STID.
  • the base station can directly transmit information for cooperative communication (client cooperation) through the corresponding A-MAP-IE.
  • the base station may transmit resource allocation information of a data channel through which information for cooperative communication is transmitted to a terminal capable of cooperative communication in a cell at the same time.
  • the base station may set a group-specific cooperative communication group STID (group-specific cooperative communication STID) by grouping terminals capable of cooperative communication (client cooperation) according to a specific condition in order to define a candidate cooperative terminal. That is, during the network entry / re-entry process of the terminals, the base station sets a group-specific cooperative communication STID only for specific terminals among the terminals that are capable of cooperative communication through a capability negotiation process and transmits the same to the terminals belonging to the group. I can tell you.
  • group-specific cooperative communication group STID group-specific cooperative communication STID
  • the base station may reconfigure the group-specific cooperative communication STID for the specific terminal. For example, when the specific condition of grouping is the location of the terminal, the base station may allocate the group-specific cooperative communication STID according to the location of the terminal in one cell. Since the location may change dynamically because the terminal may be mobile, the base station needs to change the group-specific cooperative communication STID according to the location of the terminal.
  • the base station may reconfigure the MAC-specific message or reconfigure the group-specific cooperative STID through a control channel such as an A-MAP IE. It can be transmitted to the group terminals.
  • the base station may allocate a group-specific cooperative communication STID only to a terminal supporting a location based service (LBS) to track the location of the terminal.
  • LBS location based service
  • the base station may assign a group-specific cooperative communication STID by grouping terminals belonging to the same user or the same user group. That is, the base station may assign a group-specific cooperative communication STID to terminals belonging to the same user group (for example, a mobile terminal, a laptop, a tablet PC, etc. belonging to a specific user).
  • the base station When a specific source terminal requests cooperative communication in the group, or when the base station requests cooperative communication for a specific terminal, the base station multicasts a message for the cooperative terminals capable of performing cooperative communication for the source terminal.
  • the group-specific cooperative communication STID may be used to transmit information.
  • the base station directly transmits information for cooperative communication through a control channel (for example, A-MAP IE) CRC masked to the corresponding group-specific cooperative communication STID, or a data channel for transmitting information for cooperative communication.
  • Resource allocation information may be simultaneously transmitted to the group terminal.
  • terminals supporting the WiFi ad-hoc mode may transmit their identifier information (WiFi MAC address or IP address) to the base station through a network entry / reentry process.
  • the terminal may transmit not only its own WiFi MAC address but also the WiFi MAC addresses of terminals connected to the WiFi ad-hoc link to the base station.
  • the terminals to which the corresponding WiFi ad-hoc link is connected may be terminals belonging to the same user.
  • the terminals may also transmit a channel measurement result with the terminals connected to the WiFi ad-hoc link connection to the base station.
  • the plurality of terminals each have their own WiFi MAC address.
  • the WiFi MAC address or IP address of the terminals capable of direct communication in the WiFi ad-hoc mode may be transmitted together with the IP address.
  • the plurality of terminals may transmit the WiFi direct link channel state information for each terminal to the base station.
  • the WiFi MAC address information of the terminals capable of direct communication through the WiFi ad-hoc mode may be transmitted by all of the terminals, or in the case of terminals belonging to the same user, a specific header (or representative) terminal may be transmitted to the base station.
  • the base station may group terminals capable of connecting to the corresponding WiFi ad-hoc based on the WiFi MAC address information of the terminals capable of direct communication through the WiFi ad-hoc mode.
  • the base station may allocate a group-specific cooperative communication STID to the grouped terminals and transmit them to the corresponding terminals.
  • the source terminal may directly designate the cooperative terminal and request the base station.
  • Pairing between terminals for cooperative communication may be performed in the above group or may be performed between groups.
  • the base station may set a new pairing STID only for paired terminals for cooperative communication and assign it to the paired terminals. This is a STID of a temporary characteristic shared between terminals paired for actual cooperative communication in a form different from the cell-specific or group-specific cooperative communication STID described above.
  • the terminal paired for the cooperative communication may be a plurality of terminals, and when the cooperative communication between the paired terminals is performed, the source terminal and the cooperative terminal are not in a fixed form, and the terminal in which data transmission with the base station is actually performed.
  • the source terminal and the cooperative terminal may be dynamically changed according to which of the paired terminals. For example, assume that terminal A and terminal B are paired terminals for cooperative communication.
  • terminal A and terminal B are paired terminals for cooperative communication.
  • the terminal A acts as a source terminal and the terminal B operates as a cooperative terminal.
  • the terminal A can be operated as a cooperative terminal.
  • the base station for the terminals performing the dynamic cooperative communication is performed by the base station through a control channel (eg, assigned A-MAP IE (Assignment AMAP-IE)) for the paired terminal.
  • a control channel eg, assigned A-MAP IE (Assignment AMAP-IE)
  • Information terminal indicating whether the terminal is a source terminal or a cooperative terminal).
  • the IEEE 802.16m system which is an example of a wireless communication system, supports multiple connections to one terminal. Therefore, the terminal needs to identify a plurality of connections.
  • the flow ID is a identifier for identifying a connection in the terminal.
  • the base station may configure a flow ID for cooperative communication with a specific flow identifier (flow ID) on the advanced air interface (AAI).
  • the base station may transmit the cooperative flow ID configured as described above to the terminals through system information or transmit only the cooperative communication flow ID (client cooperation dedicated flow ID) to the terminals capable of cooperative communication during the network entry process of the terminal.
  • the source terminal and the cooperative terminal which perform the cooperative communication may decode a connection for the cooperative communication using the flow ID for the cooperative communication.
  • Apparatus and method for performing cooperative communication between terminals and apparatus and method for supporting cooperative communication between terminals may be applied industrially in various communication systems such as IEEE 802.16, 3GPP LTE, LTE-A system.

Abstract

La présente invention porte sur un appareil et un procédé de réalisation d'une communication coopérative entre terminaux dans un système de communication sans fil, et sur un appareil et un procédé de prise en charge d'une communication coopérative entre terminaux dans un système de communication sans fil. Selon un mode de réalisation de la présente invention, une station de base comprend un récepteur et un émetteur. Le récepteur reçoit, en provenance d'un premier terminal, un premier message contenant des informations sur un identifiant premier de terminal, des informations qui permettent une connexion en liaison directe entre le premier terminal et un ou plusieurs terminaux candidats capables de réaliser une communication coopérative dans une cellule dont relève le premier terminal, et/ou des informations sur le mode dans lequel le premier terminal réalise une communication coopérative. L'émetteur transmet, auxdits terminaux candidats, un message pour demander une connexion en liaison directe au premier terminal, le message contenant les informations sur l'identifiant de premier terminal et/ou des informations sur le mode dans lequel le premier terminal réalise une communication coopérative. Dans la présente invention, le réseau auquel le premier terminal et les terminaux candidats sont connectés est différent du réseau auquel le premier terminal et la station de base sont connectés.
PCT/KR2011/003908 2010-05-27 2011-05-27 Appareil et procédé de réalisation ou de prise en charge d'une communication coopérative entre terminaux dans un système de communication sans fil WO2011149307A2 (fr)

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KR1020127030871A KR20130082447A (ko) 2010-05-27 2011-05-27 무선통신 시스템에서 단말간 협력통신을 수행 또는 지원하기 위한 장치 및 그 방법
US13/700,019 US20130064213A1 (en) 2010-05-27 2011-05-27 Apparatus and method for performing or supporting cooperative communication between terminals in a wireless communication system

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