WO2013167078A2 - 一种终端间直接通信的方法及系统 - Google Patents

一种终端间直接通信的方法及系统 Download PDF

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Publication number
WO2013167078A2
WO2013167078A2 PCT/CN2013/080049 CN2013080049W WO2013167078A2 WO 2013167078 A2 WO2013167078 A2 WO 2013167078A2 CN 2013080049 W CN2013080049 W CN 2013080049W WO 2013167078 A2 WO2013167078 A2 WO 2013167078A2
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WO
WIPO (PCT)
Prior art keywords
terminal
source terminal
destination terminal
communication
destination
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PCT/CN2013/080049
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English (en)
French (fr)
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WO2013167078A3 (zh
Inventor
郭胜祥
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP13788100.9A priority Critical patent/EP2958359B1/en
Priority to US14/775,873 priority patent/US20160037570A1/en
Publication of WO2013167078A2 publication Critical patent/WO2013167078A2/zh
Publication of WO2013167078A3 publication Critical patent/WO2013167078A3/zh

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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
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H04W8/245—Transfer of terminal data from a network towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and a related system for direct communication between terminals. Background technique
  • D2D Device-to-Device
  • direct communication between mobile terminals is mainly divided into two ways: one is to achieve direct communication between the base stations through the base station access scheduling under the control of the mobile network; the other is not to use the existing mobile network, only Direct communication with each other is achieved by using the communication functions of the terminal itself.
  • the current mobile terminal it does not have the capability of direct communication between the above two types of terminals, and only has the traditional cellular communication function. Therefore, it is necessary to study a method and system for establishing direct communication to achieve direct communication between terminals. Summary of the invention
  • the purpose of the embodiments of the present invention is to provide a method and system for direct communication between terminals, so that the terminal can be applied to both D2D communication under the control of the cellular network and to the public security field.
  • a method for direct communication between terminals includes: The source terminal initiates a direct communication D2D communication request with the destination terminal; and according to the D2D communication request, whether the source terminal and the destination terminal can directly communicate for detection;
  • the detection result is that the source terminal and the destination terminal can directly communicate, establishing a D2D communication link between the source terminal and the destination terminal;
  • the source terminal and the destination terminal perform direct communication using the D2D communication link.
  • the source terminal initiates a D2D communication request with the second terminal, including: the source terminal initiates a D2D communication request to the network side to directly communicate with the requested destination terminal.
  • the detecting, by the D2D communication request, whether the source terminal and the destination terminal are capable of directly communicating includes:
  • the network side After receiving the D2D communication request, the network side performs pre-judgment on whether the source terminal and the destination terminal can directly communicate;
  • the network side separately sends a notification message for discovering the other party to the source terminal and the destination terminal;
  • the source terminal and the destination terminal respectively use the notification message received by the source terminal to send a detection signal to the other party, and detect the detection signal sent by the other party, and send the detection result to the network side;
  • the network side obtains a detection result of whether the source terminal and the destination terminal can perform direct communication according to the detection result of the source terminal and the destination terminal.
  • the pre-judging is performed on whether the source terminal and the destination terminal can directly communicate, including:
  • the network side determines whether the destination terminal supports direct communication, and determines whether the destination terminal is located in the 'j, the area, or the neighboring cell where the source terminal is located;
  • the pre-judgment result on the network side is that the source terminal and the destination terminal can directly communicate; otherwise, the network side
  • the pre-judgment result is that the source terminal and the destination terminal cannot communicate directly.
  • the pre-judging is performed on whether the source terminal and the destination terminal can directly communicate, including:
  • the network side determines whether the destination terminal supports direct communication, and whether the distance from the source terminal is smaller than a preset distance threshold
  • the network side pre-judgment result is that the source terminal and the destination terminal can directly communicate; otherwise, the network side pre-judgment result is The source terminal and the destination terminal cannot communicate directly.
  • the notification message includes the identity verification information between the source terminal and the destination terminal and the time-frequency resource information used by the sounding signal
  • the source terminal and the destination terminal respectively send the detection to the other party by using the notification message respectively received by the source terminal and the destination terminal.
  • detecting, by the source terminal and the destination terminal, the source terminal and the destination terminal respectively generate a sounding signal including the identity verification information by using the notification message received by the source terminal and the destination terminal, and using the time-frequency resource information to indicate Frequency resources, respectively sending a sounding signal to the other party;
  • the source terminal and the destination terminal respectively detect the probe signal sent by the other party by using the identity verification information, and analyze the detected probe signal of the other party to obtain a detection result including the terminal probe information and the channel quality information.
  • the network side obtains, according to the detection result of the source terminal and the destination terminal, whether the source terminal and the destination terminal can perform direct communication detection, including:
  • the network side determines, according to the terminal detection information of the source terminal and the destination terminal, whether the source terminal and the destination terminal can mutually detect each other;
  • the source terminal and the destination terminal can determine whether the source terminal and the destination terminal can directly communicate according to the channel quality information reported by the source terminal and the destination terminal.
  • the network side determines that the source terminal and the destination terminal can perform direct communication, generate a notification for The source terminal and the destination terminal perform direct communication messages, and are respectively sent to the source terminal and the destination terminal, where the message includes information for indicating time-frequency resources used for direct communication and information about initial power of the terminal.
  • the source terminal initiates a D2D communication request for directly communicating with the destination terminal, including:
  • the source terminal initiates a D2D communication request through the public safety dedicated channel to directly communicate with the destination terminal that received the D2D communication request.
  • the detecting, according to the D2D communication request, whether the source terminal and the destination terminal can directly communicate includes:
  • the probe signal is sent through the public safety dedicated channel, and the received probe signal is detected;
  • the destination terminal After receiving the D2D communication request, the destination terminal sends a detection signal through a public safety dedicated channel, and detects the received detection signal;
  • the source terminal and the destination terminal respectively send respective detection results to the other party through a public safety dedicated channel;
  • the detection result that the source terminal and the destination terminal can perform direct communication is obtained, otherwise, the source terminal and the destination terminal cannot directly communicate. Test results.
  • a system for direct communication between terminals includes:
  • the request initiation module is configured to initiate a D2D communication request with the destination terminal;
  • the detection determination module is configured to detect, according to the D2D communication request sent by the request initiation module, whether the source terminal and the destination terminal can directly communicate, and send the detection Result to the link establishment module;
  • the link establishment module is configured to: when the detection result sent by the detection and determination module is the source terminal and the destination When the terminal is capable of direct communication, when located at the source terminal, establishes a D2D communication link with the destination terminal, and when located at the destination terminal, establishes a D2D communication link with the source terminal;
  • the direct communication module is configured to perform direct communication using the D2D communication link.
  • the embodiments of the present invention implement direct communication between terminals, and can be applied not only to D2D communication under cellular network control, but also to public security.
  • FIG. 1 is a schematic block diagram of a method for direct communication between terminals according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a specific wireless terminal according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a network side D2D communication control module according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a process for establishing D2D communication under cellular communication control according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a process for establishing D2D communication without the participation of a cellular network according to an embodiment of the present invention. detailed description
  • FIG. 1 is a schematic block diagram of a method for direct communication between terminals according to an embodiment of the present invention. As shown in FIG. 1 , the steps include:
  • Step 101 The source terminal initiates a D2D communication request for the destination terminal.
  • the source terminal may initiate a D2D communication request to the network side to directly communicate with the destination terminal that it requests;
  • the source terminal may also initiate a D2D communication request through the public safety dedicated channel to directly communicate with the destination terminal that receives the D2D communication request.
  • Step 102 Detect whether the source terminal and the destination terminal can directly communicate according to the D2D communication request.
  • the network side when the network side receives the D2D communication request, it performs pre-judgment on whether the source terminal and the destination terminal can directly communicate. If the pre-judgment result is that the direct communication is possible, the network side respectively goes to the source terminal and The destination terminal sends a notification message for discovering the other party, so that the source terminal and the destination terminal respectively send the detection signal to the other party by using the notification message received by the source terminal and the destination terminal, and detect the detection signal sent by the other party, and send the detection result to the network side. The network side obtains a detection result of whether the source terminal and the destination terminal can perform direct communication according to the detection result of the source terminal and the destination terminal.
  • the pre-judgment includes: determining, by the network side, whether the destination terminal supports direct communication, and whether it is located in a cell where the source terminal is located or a neighboring cell; if the destination terminal supports direct communication, and is located in a cell or a neighboring cell where the first terminal is located
  • the pre-judgment result on the network side is that the source terminal and the destination terminal can directly communicate; otherwise, the pre-judgment result on the network side is that the source terminal and the destination terminal cannot directly communicate;
  • the network side determines whether the destination terminal supports direct communication, and whether the distance between the source terminal and the source terminal is less than a preset distance threshold; if the destination terminal supports direct communication, and the distance from the source terminal is less than the preset distance threshold.
  • the value of the pre-judgment result on the network side is that the source terminal and the destination terminal can directly communicate; otherwise, the pre-judgment result on the network side is that the source terminal and the destination terminal cannot directly communicate.
  • the notification message received by the source terminal and the destination terminal includes: identity verification information between the source terminal and the destination terminal, and time-frequency resource information used by the sounding signal.
  • the source terminal and the destination terminal respectively generate a sounding signal including the identity verification information by using the notification message received by the source terminal and the destination terminal, and respectively send a sounding signal to the other party by using the time-frequency resource indicated by the time-frequency resource information;
  • the source terminal and the destination terminal separately detect the sent by the other party by using the identity verification information Detecting a signal, and analyzing the detected detection signal of the other party to obtain a detection result including terminal detection information and channel quality information;
  • the network side determines whether the source terminal and the destination terminal can detect each other according to the terminal detection information of the source terminal and the destination terminal. If the network side determines that the source terminal and the destination terminal can detect each other, the source terminal and the destination terminal are The reported channel quality information determines whether the source terminal and the destination terminal can perform direct communication; if the network side determines that the source terminal and the destination terminal can perform direct communication, generates a message for notifying the source terminal and the destination terminal to perform direct communication, and respectively And sending to the source terminal and the destination terminal; the message includes: information used to indicate time-frequency resources used for direct communication and initial power of the terminal.
  • the probe signal is sent through the public safety dedicated channel, and the received probe signal is detected; after receiving the D2D communication request, the destination terminal passes the public safety dedicated channel. Sending the sounding signal and detecting the received sounding signal; the source terminal and the destination terminal respectively send the respective sounding results to the other party through the public safety dedicated channel; and the source terminal and the destination terminal determine the source terminal and the destination terminal according to the detection results of both parties.
  • the detection result that the source terminal and the destination terminal can perform direct communication is obtained, otherwise, the detection result that the source terminal and the destination terminal cannot directly communicate with each other is obtained.
  • Step 103 If the detection result is that the source terminal and the destination terminal can directly communicate, establish a D2D communication link between the source terminal and the destination terminal.
  • the source terminal and the destination terminal establish a D2D communication link by using the time-frequency resource indicated by the information indicating the time-frequency resource used for direct communication.
  • Step 104 The source terminal and the destination terminal perform direct communication by using the D2D communication link.
  • the source terminal and the destination terminal use the D2D communication link to perform direct communication according to the initial power of the terminal indicated by the information of the initial power of the terminal.
  • the embodiment of the invention further provides a system for direct communication between terminals, comprising:
  • a request initiation module located at the source terminal, configured to initiate a D2D communication request with the destination terminal
  • the detecting and determining module is located at the base station side, configured to detect whether the source terminal and the destination terminal can directly communicate according to the D2D communication request, and send the detection result to the link establishing module;
  • the link establishing module is located at the source terminal and the destination terminal, When the detection result is that the source terminal and the destination terminal can directly communicate, when located at the source terminal, establish a D2D communication link with the destination terminal, and when located at the destination terminal, establish a D2D communication link with the source terminal;
  • the direct communication module is located at the source terminal and the destination terminal, and is configured to perform direct communication by using the D2D communication link.
  • the radio access system according to the embodiment of the present invention may be an LTE system, or may be WCDMA, CDMA (2000), TD-SCDMA, GSM, and other wireless access systems.
  • the terminal involved in the embodiment of the present invention is a wireless terminal, which is used for initiating a D2D communication request, performing terminal device discovery, and direct communication between terminals, and further configured to communicate with a cellular network in a conventional terminal and cellular communication.
  • FIG. 2 is a schematic diagram of a wireless terminal according to an embodiment of the present invention.
  • the wireless terminal adds a new module to adapt to D2D direct communication on the basis of preserving the legacy LTE terminal module, thereby maximizing the maximum
  • the existing LTE terminal module is used to achieve cost saving.
  • the module added by the wireless terminal includes: a detection signal generator and a detection signal detector.
  • the receiving data pre-processing module of the wireless terminal includes not only a Single Carrier Orthogonal Frequency Division Multiplexing (OFDM) demodulator that the conventional LTE terminal has, but also an SC-OFDM demodulator.
  • the transmit data pre-processing module may include only the SC-OFDM modulator owned by the legacy LTE terminal, or may further add an OFDM modulator, which does not include the OFDM modulator in this embodiment.
  • the radio frequency transceiver module of the wireless terminal not only includes the cellular communication transceiver end owned by the traditional terminal, but also adds a public safety transceiver end.
  • the wireless terminal communicates with the cellular network, Selecting the cellular communication transceiver end, when performing D2D direct communication between the terminals, the cellular communication transceiver end can be selected according to the required service, and the public safety transceiver end can also be selected.
  • the controller of the wireless terminal is configured to initiate a D2D communication request for direct communication with the destination terminal, establish a D2D communication link, and control direct communication between the terminals before directly communicating between the terminals.
  • the controller is also used to determine whether the terminals can communicate directly.
  • the probe signal generator is configured to generate a sounding signal in a terminal device discovery process, where the sounding signal includes: identity verification information between terminals, a channel reference signal, and may further include data information.
  • the sounding signal generator generates a sounding signal according to the information related to the sounding signal sent by the network side, and the sounding signal is subjected to single carrier orthogonal frequency division multiplexing in the transmitting data preprocessing module (Single The Carrier Orthogonal Frequency Division Multiplexing (SC-OFDM) modulator is modulated and then transmitted by the RF transceiver module.
  • SC-OFDM Single Carrier Orthogonal Frequency Division Multiplexing
  • the detection signal detector is used to detect and analyze the detection signals generated by other wireless terminals, and the detection results include terminal detection result information (ie, whether a certain wireless terminal is found), channel quality information, and the like.
  • the terminal receives the sounding signal from the other wireless terminal, demodulates the received sounding signal through the SC-OFDM demodulator in the receiving data preprocessing module, and then according to the identity verification information sent by the network side.
  • the probe signal is analyzed and a probe result is generated.
  • the data of the terminal is SC-OFDM modulated by the transmitting data pre-processing module, and then transmitted by the cellular communication transceiver; when downlinking, the terminal receives the base station transmission through the cellular communication transceiver.
  • the signal is then subjected to OFDM demodulation by the received data preprocessing module.
  • the probing signal generator, the probing signal detector, and the public safety transceiver are all inactive.
  • the data of the terminal is SC-OFDM modulated by the transmitting data pre-processing module, and then transmitted through the cellular communication transceiver or the public safety transceiver (selected according to the required service); , the terminal through the cellular communication transceiver or public
  • the common secure transceiver receives the signals transmitted by other terminals, and then performs the data preprocessing module.
  • the controller can implement the request initiation module, by combining the SC-OFDM modulator, the SC-OFDM demodulator, the cellular communication transceiver, and the public communication transceiver in the wireless terminal.
  • the function of the link establishment module and the direct communication module is implemented by combining a detection signal generator, a detection signal detector, and the like, and the controller can implement the function of the detection and determination module.
  • the communication network in the embodiment of the present invention may include, in addition to the wireless terminal, a base station and a D2D control module on the network side.
  • a D2D control module used for communicating with the wireless terminal, processing the wireless terminal D2D communication request, making pre-judgment of D2D communication, controlling the switching of the D2D and the cellular network, and controlling the resources and power of the D2D communication.
  • the parameters implement the functions of the detection and determination module.
  • the purpose of the D2D communication control module on the network side is to ensure that the terminal user performs D2D communication under the control of the cellular network.
  • the D2D control module includes: a D2D pre-judgment sub-module and a D2D time-frequency resource allocation sub- Module, D2D and cellular communication switching control sub-module, and D2D power control sub-module;
  • the D2D pre-judgment sub-module is configured to: 1. determine whether the terminal supports the D2D communication function; 2. determine whether the two wireless terminals are in the same cell or neighboring cells, and if the determination result is no, directly reject the D2D communication request. 3. If the wireless terminal can provide positioning information such as GPS, determine the distance between the two terminals according to the positioning information of the two terminals, and determine whether the terminals are close to each other after determining the preset distance threshold.
  • the D2D time-frequency resource allocation sub-module is configured to provide mutual authentication information between the wireless terminals and time-frequency resource information of the time-frequency resources occupied by the sounding signals.
  • the D2D and the cellular communication switching control sub-module are configured to determine whether to perform direct communication and cellular communication switching according to the information reported by the terminal, and the information reported by the terminal may include channel quality information, and may further include whether the D2D communication improves cell throughput. Quantity, D2D communication is not Beam and other information.
  • the D2D power control sub-module is configured to control a transmit power of direct communication between the wireless terminals to avoid interference with a cell user or a base station.
  • FIG. 4 is a schematic flowchart of establishing D2D communication under cellular communication control according to an embodiment of the present invention.
  • a terminal Under the control of a cellular network, a terminal initiates a D2D communication request to a network side, and the network side pre-judges the request. If the reservation condition is met, Then, the relevant terminal is notified to prepare for the device discovery process, and the terminal performs the device discovery process, and feeds the detection result to the network side, so that the network side determines whether direct communication between the terminals can be established.
  • the specific steps include:
  • Step 401 The source terminal UE2 performs D2D registration in the network before initiating the D2D communication request, where the registration related information may include: identity insurance information, address information, information owned by the service, and the like.
  • Step 402 The UE2 sends a D2D communication request to the cellular network, where the request includes related information of the destination terminal UE1.
  • Step 403 The network side D2D control module performs pre-judgment on whether the UE1 and the UE2 can directly communicate. If the D2D pre-judgment condition is not met, the message rejecting the direct communication is fed back to the UE2, and the processing flow is ended; if the D2D pre-judgment condition is met, Go to step 404.
  • the D2D pre-judgment condition includes: whether the UE1 supports direct communication, whether it is located in the cell where the UE2 is located or a neighboring cell, or whether the distance between the UE2 and the UE2 is less than a preset distance threshold.
  • the D2D pre-judgment condition is satisfied when the UE1 supporting the direct communication is located in the cell or the neighboring cell where the UE2 is located, or when the distance between the UE1 and the UE2 supporting the direct communication is less than the preset distance threshold.
  • the network side can also directly detect the user being served periodically, and predict whether the two terminals can directly communicate with each other without performing the above step 402.
  • Step 404 The network side separately informs the UE2 and the UE1 to prepare for the device discovery process, where the notification message may include identity verification information between the users, information of the time-frequency resource that the sounding signal can be used, and the like.
  • Step 405 The UE2 and the UE1 perform a device discovery process, including a process in which the UE1 and the UE2 respectively transmit a sounding signal and receive an analysis sounding signal.
  • the device discovery process includes a process of transmitting a sounding signal and receiving an analysis sounding signal.
  • the sounding signal may include authentication information between terminals, a channel reference signal, or also include data information and the like.
  • Step 406 The UE2 and the UE1 respectively feed back the detection result to the network side D2D control module, where the detection result may include channel quality information, minimum power required, and the like.
  • Step 407 The D2D control module determines whether to perform handover between the direct communication and the cellular network communication according to the feedback result of the feedback. If the handover condition is not met, the message rejecting the direct communication is fed back to the UE2, and the processing flow is ended; if the handover condition is met, the process is performed. Step 408.
  • the handover condition may include channel quality information, and may further include information such as whether D2D communication improves cell throughput, whether D2D communication is over, or the like. If the channel quality is poor, the cell throughput is reduced, or the D2D communication is over, then the cell communication is switched.
  • Step 408 The D2D control module sends a message to the UE2 and the UE1 to notify the UE2 and the UE1 to establish direct communication, and performs power control on the UE2 and the UE1.
  • the message may include time-frequency resources and initial power required for direct communication. And other information.
  • Step 409 A D2D communication link is established between UE1 and UE2, and direct communication is performed by using the D2D communication link.
  • Direct communication between terminals can improve spectrum utilization by sharing resources with cell users. It can also reduce the burden on cellular networks, reduce battery power consumption of mobile terminals, increase bit rate, and improve the robustness of network infrastructure failures. It also supports new small-scale peer-to-peer data services.
  • the participation of the core network is not required compared to the traditional cellular communication mode, thereby reducing the burden of communication with the base station and saving the occupied communication resources.
  • the technical research and implementation of direct communication between terminals is very important for the development of communication technology. The meaning of the meaning.
  • FIG. 5 is a schematic flowchart of establishing D2D communication without the participation of a cellular network according to an embodiment of the present invention.
  • a terminal periodically initiates a D2D communication request or a user triggers a D2D communication request without the participation of a cellular network
  • the terminal executes the device.
  • This direct communication method is particularly suitable for public safety. For example, in the event of natural disasters such as earthquakes and tsunamis, even if there is no coverage from the wireless base station, users can directly establish communication links.
  • the two terminal users UE1 and UE2 establish D2D communication as an example.
  • the steps include:
  • Step 501 The terminal UE1 initiates a D2D communication request periodically or in a manual trigger form.
  • Step 502 After receiving the D2D communication request, the terminal UE2 responds to the D2D communication request.
  • Step 503 UE1 and UE2 perform a device discovery process.
  • UE1 transmits a sounding signal
  • UE2 performs sounding signal detection
  • UE2 transmits a sounding signal
  • UE1 performs sounding signal detection
  • UE1 and UE2 mutually feed back the sounding result.
  • the frequency used by the sounding signal occupies the resources of the public safety dedicated channel.
  • Step 504 Communicate by using a public safety dedicated channel communication or a designated channel to establish direct communication between terminals.
  • direct communication between terminals is also in response to the needs of the public security field.
  • a major natural disaster such as earthquakes and torrents
  • the disappearance of the communication network signal makes the mobile terminal unable to carry out the necessary communication, which brings great disaster relief. Difficulty.
  • the direct communication technology between terminals can avoid this situation.
  • direct communication between terminals can be realized, which brings great convenience to disaster relief.
  • the terminal may first determine whether the signal quality of the base station of the cellular network can support the communication, and if it can support, select the cellular network control. The D2D establishment process is established. Otherwise, the D2D establishment process without cellular network participation can be selected. If the terminal supports manual control whether cellular network control is required, the base station signal quality may not be judged and manually selected.

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Abstract

本发明公开了一种终端间直接通信的方法及系统，涉及无线通信技术领域，所述方法包括：源终端发起用于与目的终端的直接通信（D2D）通信请求；根据所述D2D通信请求，对源终端和目的终端是否能够直接通信进行检测；若检测结果为源终端和目的终端能够直接通信，则建立源终端和目的终端间的D2D通信链路；源终端和目的终端利用所述D2D通信链路，进行直接通信。本发明实现了终端间直接通信，既可以用于移动网络控制下的直接通信，又可以用于无移动网络的情况，即公共安全领域。

Description

一种终端间直接通信的方法及系统 技术领域
本发明涉及无线通信技术领域， 特别涉及一种终端间直接通信的方法 以及相关系统。 背景技术
随着移动终端， 尤其是智能终端不断的增加， 移动互联网的数据业务 量呈现出高速增长。 预计到 2020年， 无线通信的带宽需求将在 1.2GHz到 1.7GHz之间， 分配的带宽资源已满足不了无线通信发展的需求。
为了突破现有频谱资源的约束， 在通信系统的后续演进中， 例如 LTE- Advanced, 提出了终端之间的直接通信（Device-to-Device, D2D )技 术。
目前， 移动终端间的直接通信主要分为两种方式： 一类是在移动网络 控制下通过基站接入调度来实现相互之间的直接通信功能； 另一类是不借 助现有移动网络， 只利用终端本身的通信功能实现相互间的直接通信。 对 于当前移动终端而言， 并不具备上述两类终端间直接通信的能力， 只具备 传统蜂窝通信功能。 因此有必要研究一种建立直接通信的方法及系统， 以 便实现终端间直接通信。 发明内容
本发明实施例的目的在于提供一种终端间直接通信的方法及系统， 使 终端既可以应用于蜂窝网络控制下的 D2D通信， 又可以应用于公共安全领 域。
根据本发明实施例的一个方面， 提供了一种终端间直接通信的方法， 所述方法包括： 源终端发起用于与目的终端的直接通信 D2D通信请求； 根据所述 D2D通信请求， 对源终端和目的终端是否能够直接通信进行 检测；
若检测结果为源终端和目的终端能够直接通信， 则建立源终端和目的 终端间的 D2D通信链路；
源终端和目的终端利用所述 D2D通信链路， 进行直接通信。
优选地， 所述源终端发起用于与第二终端的 D2D通信请求， 包括： 源终端向网络侧发起 D2D通信请求， 以便与其请求的目的终端直接通 信。
优选地， 所述根据所述 D2D通信请求对源终端和目的终端是否能够直 接通信进行检测， 包括：
网络侧收到所述 D2D通信请求后， 对源终端和目的终端是否能够直接 通信进行预判断；
当网络侧预判断结果为源终端和目的终端能够直接通信时， 网络侧分 别向源终端和目的终端发送用于发现对方的通知消息；
源终端和目的终端利用各自收到的所述通知消息， 分别向对方发送探 测信号， 并检测对方发送的探测信号， 将探测结果发送至网络侧；
网络侧根据所述源终端和所述目的终端的探测结果， 得到源终端和目 的终端是否能够进行直接通信的检测结果。
优选地， 所述对源终端和目的终端是否能够直接通信进行预判断， 包 括：
网络侧判断目的终端是否支持直接通信， 且判断所述目的终端是否位 于源终端所在' j、区或相邻小区；
若目的终端支持直接通信， 且位于所述源终端所在小区或相邻小区， 则网络侧的预判断结果为源终端和目的终端能够直接通信； 否则， 网络侧 的预判断结果为源终端和目的终端不能直接通信。
优选地， 所述对源终端和目的终端是否能够直接通信进行预判断， 包 括：
网络侧判断目的终端是否支持直接通信， 且与源终端间的距离是否小 于预设距离门限值；
若目的终端支持直接通信， 且与源终端间的距离小于所述预设距离门 限值， 则网络侧的预判断结果为源终端和目的终端能够直接通信， 否则， 网络侧的预判断结果为源终端和目的终端不能直接通信。
优选地， 所述通知消息包括源终端与目的终端间的身份验证信息和探 测信号所使用的时频资源信息， 所述源终端和目的终端利用各自收到的所 述通知消息分别向对方发送探测信号， 并检测对方发送的探测信号， 包括： 源终端和目的终端利用各自收到的所述通知消息， 分别生成包含所述 身份验证信息的探测信号， 并利用所述时频资源信息指示的时频资源， 分 别向对方发送探测信号；
源终端和目的终端利用所述身份验证信息分别检测对方发送的探测信 号， 并对检测到的对方的探测信号进行分析， 得到包含终端探测信息和信 道质量信息的探测结果。
优选地， 所述网络侧根据所述源终端和所述目的终端的探测结果， 得 到源终端和目的终端是否能够进行直接通信的检测结果， 包括：
网络侧根据源终端和目的终端的终端探测信息， 确定源终端和目的终 端是否能够相互探测到对方；
若网络侧确定源终端和目的终端能够相互探测到对方， 则根据源终端 和目的终端上报的信道质量信息， 判断源终端和目的终端是否能够进行直 接通信；
若网络侧确定源终端和目的终端能够进行直接通信， 则生成用于通知 源终端和目的终端进行直接通信的消息， 并分别发送至源终端和目的终端， 所述消息包含用于指示直接通信所使用时频资源的信息和终端初始功率的 信息。
优选地， 所述源终端发起用于与目的终端直接通信的 D2D通信请求， 包括：
源终端通过公共安全专用信道发起 D2D 通信请求， 以便与收到所述 D2D通信请求的目的终端进行直接通信。
优选地， 所述根据所述 D2D通信请求， 对源终端和目的终端是否能够 直接通信进行检测， 包括：
源终端发送所述 D2D通信请求后， 通过公共安全专用信道发送探测信 号， 并检测收到的探测信号；
目的终端收到所述 D2D通信请求后， 通过公共安全专用信道发送探测 信号， 并检测收到的探测信号；
源终端和目的终端通过公共安全专用信道分别将各自的探测结果发送 至对方；
当源终端和目的终端根据双方的探测结果， 确定源终端和目的终端能 够相互探测到对方时， 得到源终端和目的终端能够进行直接通信的检测结 果， 否则， 得到源终端和目的终端不能直接通信的检测结果。
根据本发明实施例的另一方面， 提供了一种终端间直接通信的系统， 所述系统包括：
请求发起模块， 配置为发起用来与目的终端的 D2D通信请求； 检测判断模块， 配置为根据请求发起模块发来的所述 D2D通信请求， 检测源终端和目的终端是否能够直接通信， 并发送检测结果至链路建立模 块；
链路建立模块， 配置为当检测判断模块发来的检测结果为源终端和目 的终端能够直接通信时， 当位于源终端时， 建立与目的终端间的 D2D通信 链路， 当位于目的终端时， 建立与源终端间的 D2D通信链路；
直接通信模块， 配置为利用所述 D2D通信链路， 进行直接通信。
与现有技术相比较， 本发明实施例的有益效果在于：
本发明实施例实现了终端间直接通信， 不仅可以应用于蜂窝网络控制 下的 D2D通信， 还可以应用于公共安全领域。 附图说明
图 1是本发明实施例提供的终端间直接通信的方法原理框图； 图 2是本发明实施例提供的一个具体无线终端模型图；
图 3是本发明实施例提供的网络侧 D2D通信控制模块示意图； 图 4是本发明实施例提供的在蜂窝通信控制下建立 D2D通信的流程示 意图；
图 5是本发明实施例提供的在没有蜂窝网络参与下建立 D2D通信的流 程示意图。 具体实施方式
以下结合附图对本发明的优选实施例进行详细说明， 应当理解， 以下 所说明的优选实施例仅用于说明和解释本发明， 并不用于限定本发明。
图 1 是本发明实施例提供的终端间直接通信的方法原理框图， 如图 1 所示， 步驟包括：
步驟 101 : 源终端发起用于与目的终端的 D2D通信请求。
在所述步驟 101中， 源终端可以向网络侧发起 D2D通信请求， 以便与 其请求的目的终端直接通信；
或者， 源终端也可以通过公共安全专用信道发起 D2D通信请求， 以便 与收到所述 D2D通信请求的目的终端进行直接通信。 步驟 102: 根据所述 D2D通信请求， 检测源终端和目的终端是否能够 直接通信。
在所述步驟 102中， 当网络侧收到所述 D2D通信请求时， 对源终端和 目的终端是否能够直接通信进行预判断， 若预判断结果为能够直接通信， 则网络侧分别向源终端和目的终端发送用于发现对方的通知消息， 使源终 端和目的终端利用各自收到的所述通知消息， 分别向对方发送探测信号， 并检测对方发送的探测信号， 将探测结果发送至网络侧， 网络侧根据所述 源终端和所述目的终端的探测结果， 得到源终端和目的终端是否能够进行 直接通信的检测结果。
具体地说， 所述预判断包括： 网络侧判断目的终端是否支持直接通信， 且是否位于源终端所在小区或相邻小区； 若目的终端支持直接通信， 且位 于第一终端所在小区或相邻小区， 则网络侧的预判断结果为源终端和目的 终端能够直接通信； 否则， 网络侧的预判断结果为源终端和目的终端不能 直接通信；
或者， 网络侧判断目的终端是否支持直接通信， 且与源终端间的距离 是否小于预设距离门限值； 若目的终端支持直接通信， 且与源终端间的距 离小于所述预设距离门限值， 则网络侧的预判断结果为源终端和目的终端 能够直接通信； 否则， 网络侧的预判断结果为源终端和目的终端不能直接 通信。
具体地说， 所述源终端和目的终端收到的通知消息包括： 源终端与目 的终端间的身份验证信息和探测信号所使用的时频资源信息。
首先， 源终端和目的终端利用各自收到的所述通知消息， 分别生成包 含所述身份验证信息的探测信号， 并利用所述时频资源信息指示的时频资 源， 分别向对方发送探测信号；
然后， 源终端和目的终端利用所述身份验证信息分别检测对方发送的 探测信号， 并对检测到的对方的探测信号进行分析， 得到包含终端探测信 息和信道质量信息的探测结果；
最后， 网络侧根据源终端和目的终端的终端探测信息， 判断源终端和 目的终端是否能够相互探测到对方， 若网络侧确定源终端和目的终端能够 相互探测到对方， 则根据源终端和目的终端上报的信道质量信息， 确定源 终端和目的终端是否能够进行直接通信； 若网络侧确定源终端和目的终端 能够进行直接通信， 则生成用于通知源终端和目的终端进行直接通信的消 息， 并分别发送至源终端和目的终端； 所述消息包含： 用于指示直接通信 所使用时频资源的信息和终端初始功率的信息。
在所述步驟 102中， 源终端发送所述 D2D通信请求后， 通过公共安全 专用信道发送探测信号， 并检测收到的探测信号； 目的终端收到所述 D2D 通信请求后， 通过公共安全专用信道发送探测信号， 并检测收到的探测信 号； 源终端和目的终端通过公共安全专用信道分别将各自的探测结果发送 至对方； 当源终端和目的终端根据双方的探测结果， 确定源终端和目的终 端能够相互探测到对方时， 得到源终端和目的终端能够进行直接通信的检 测结果， 否则， 得到源终端和目的终端不能直接通信的检测结果。
步驟 103: 若检测结果为源终端和目的终端能够直接通信， 则建立源终 端和目的终端间的 D2D通信链路。
在所述步驟 103 中， 源终端和目的终端利用所述用于指示直接通信所 使用时频资源的信息指示的时频资源， 建立 D2D通信链路。
步驟 104: 源终端和目的终端利用所述 D2D通信链路， 进行直接通信。 在所述步驟 104中， 源终端和目的终端利用所述 D2D通信链路， 按照 所述终端初始功率的信息指示的终端初始功率进行直接通信。
本发明实施例还提供了一种终端间直接通信的系统， 包括：
请求发起模块，位于源终端，配置为发起与目的终端的 D2D通信请求； 检测判断模块， 位于基站侧， 配置为根据所述 D2D通信请求， 检测源 终端和目的终端是否能够直接通信， 并发送检测结果至链路建立模块； 链路建立模块， 位于源终端及目的终端， 配置为当检测结果为源终端 和目的终端能够直接通信时， 当位于源终端时， 建立与目的终端间的 D2D 通信链路， 当位于目的终端时， 建立与源终端间的 D2D通信链路；
直接通信模块， 位于源终端及目的终端， 配置为利用所述 D2D通信链 路， 进行直接通信。
本发明实施例涉及的无线接入系统可以是 LTE 系统， 也可以是 WCDMA、 CDMA ( 2000 )、 TD-SCDMA、 GSM, 以及其它的无线接入系统。 本发明实施例所涉及的终端是无线终端， 用于发起 D2D通信请求， 执行终 端设备发现， 以及终端间直接通信， 此外， 在传统的终端与蜂窝通信中， 还配置为与蜂窝网络进行通信。
为了便于理解， 下面以 LTE系统为例对本发明实施例进一步说明。 图 2是本发明实施例提供的一个无线终端模型图， 如图 2所示， 所述 无线终端是在保留传统 LTE终端模块的基础上，增加新模块以适应 D2D直 接通信， 因此可以最大限度的利用已有的 LTE终端模块， 达到节省成本的 目的。
所述无线终端增加的模块包括： 探测信号生成器和探测信号检测器。 所述无线终端的接收数据预处理模块不仅包含传统 LTE终端所具有的 正交频分复用 ( Single Carrier Orthogonal Frequency Division Multiplexing, OFDM )解调器， 同时还增加了 SC-OFDM解调器。发射数据预处理模块可 以只包含传统 LTE终端所拥有的 SC-OFDM调制器， 也可以再增加 OFDM 调制器， 本实施例中没有包含 OFDM调制器。
所述无线终端的射频收发模块不仅包含传统终端所拥有的蜂窝通信收 发端， 而且还增加了公共安全收发端。 当无线终端与蜂窝网络进行通信时， 选择蜂窝通信收发端， 在终端间进行 D2D直接通信时， 依据所要求的服务 可以选择蜂窝通信收发端， 也可以选择公共安全收发端。
所述无线终端的控制器用来在终端间直接通信前， 发起用于与目的终 端直接通信的 D2D通信请求， 建立 D2D通信链路， 控制终端间直接通信。 此外， 在没有蜂窝网络时， 控制器还用于确定终端间是否能够直接通信。
所述探测信号生成器用来产生终端设备发现过程中的探测信号， 所述 探测信号包括： 终端间的身份验证信息、 信道参考信号、 还可以包括数据 信息。
在终端设备发现过程中， 探测信号生成器根据网络侧下发的与探测信 号相关的信息， 生成探测信号， 所述探测信号经过发射数据预处理模块中 的单载波正交频分复用 ( Single Carrier Orthogonal Frequency Division Multiplexing, SC-OFDM )调制器进行调制后，再由射频收发模块发射出去。 所述探测信号检测器用来探测和分析其他无线终端产生的探测信号， 探测 结果包括终端探测结果信息（即是否发现某个无线终端 ),信道质量信息等。
在终端设备发现过程中， 终端接收来自其它无线终端的探测信号， 通 过接收数据预处理模块中的 SC-OFDM解调器对接收的探测信号进行解调， 再根据网络侧下发的身份验证信息分析该探测信号， 并生成探测结果。
在传统的终端与 LTE蜂窝网络通信过程中， 上行时， 终端的数据经过 发射数据预处理模块进行 SC-OFDM调制， 再经过蜂窝通信收发端发射； 下行时， 终端通过蜂窝通信收发端接收基站发射的信号， 再经过接收数据 预处理模块进行 OFDM解调。 探测信号生成器、 探测信号检测器， 以及公 共安全收发端都处于非工作状态。
在终端间直接通信过程中， 发射时， 终端的数据经过发射数据预处理 模块进行 SC-OFDM调制，再经过蜂窝通信收发端或者公共安全收发端（依 据所要求的服务来选择）发射； 接收时， 终端通过蜂窝通信收发端或者公 共安全收发端接收其它终端发射的信号， 再经过接收数据预处理模块进行
SC-OFDM解调。
由图 2可知，通过结合所述无线终端中的 SC-OFDM调制器、 SC-OFDM 解调器、 蜂窝通信收发端、 公共通信收发端， 所述控制器能够实现所述请 求发起模块、 所述链路建立模块、 所述直接通信模块的功能， 通过结合探 测信号生成器、 探测信号检测器等器件， 所述控制器能够实现所述检测判 断模块的功能。
本发明实施例中的通信网络除了无线终端以外， 还可以包括基站和处 于网络侧的 D2D控制模块。 在蜂窝网络控制的直接通信中， 用于与无线终 端通信，处理无线终端 D2D通信请求，做 D2D通信的预判断，并控制 D2D 与蜂窝网络的切换， 以及控制 D2D通信的使用的资源及功率等参数， 实现 了所述检测判断模块的功能。 其中， 网络侧的 D2D通信控制模块的目的是 为了保证终端用户在蜂窝网络控制下进行 D2D通信， 如图 3 所示， 所述 D2D控制模块包括： D2D预判断子模块、 D2D时频资源分配子模块、 D2D 与蜂窝通信切换控制子模块， 以及 D2D功率控制子模块； 其中，
所述 D2D预判断子模块， 配置为： 1、 判断终端是否支持 D2D通信的 功能； 2、 判断两个无线终端是否处于同一小区或者相邻小区， 如果判断结 果为否， 则直接拒绝 D2D通信请求； 3、 如果无线终端能够提供 GPS等定 位信息， 则根据两个终端的定位信息， 确定两个终端间的距离， 从而与预 设距离门限值判断后， 判断终端间是否彼此接近。
所述 D2D时频资源分配子模块， 配置为提供无线终端间互相识别的身 份验证信息、 以及探测信号所占用时频资源的时频资源信息。
所述 D2D与蜂窝通信切换控制子模块， 配置为根据终端上报的信息判 断是否进行直接通信与蜂窝通信间切换， 所述终端上报的信息可以包括信 道质量信息， 还可以包括 D2D通信是否提高小区吞吐量、 D2D通信是否结 束等信息。
所述 D2D功率控制子模块， 配置为控制无线终端间直接通信的发射功 率， 以避免对小区用户或者基站的干扰。
图 4是本发明实施例提供的在蜂窝通信控制下建立 D2D通信的流程示 意图， 在蜂窝网络控制下， 终端向网络侧发起 D2D通信请求， 网络侧对该 请求作预判断， 如果满足预订条件， 则通知相关终端作设备发现过程准备， 终端执行设备发现过程， 并将探测结果反馈至网络侧， 使网络侧判断是否 可以建立终端间直接通信。 如图 4所示， 具体步驟包括：
步驟 401： 源终端 UE2在发起 D2D通信请求之前， UE2在网络中进行 D2D注册， 其中注册相关信息可包括： 身份险证信息、 地址信息、 所拥有 的服务等信息。
步驟 402: UE2向蜂窝网络发送 D2D通信请求， 该请求中包含目的终 端 UE1的相关信息。
步驟 403:网络侧 D2D控制模块对 UE1和 UE2是否能够直接通信进行 预判断，如果不满足 D2D预判断条件，则向 UE2反馈拒绝直接通信的消息， 结束处理流程； 如果满足 D2D预判断条件， 则执行步驟 404。
所述 D2D预判断条件包括： UE1 是否支持直接通信， 是否位于 UE2 所在小区或相邻小区， 或是否与 UE2间的距离小于预设距离门限值。 当支 持直接通信的 UE1位于 UE2所在小区或相邻小区时，或者当支持直接通信 的 UE1与 UE2间的距离小于预设距离门限值时， 满足 D2D预判断条件。
网络侧也可以直接周期性的检测正在服务的用户， 预判段任意两个终 端间是否可以直接通信， 而不需要进行上述步驟 402。
步驟 404: 网络侧分别通知终端 UE2和 UE1作设备发现过程准备， 所 述通知消息可包括用户间的身份验证信息、 探测信号可使用时频资源的信 息等。 步驟 405: 终端 UE2和 UE1执行设备发现过程， 包括 UE1和 UE2分 别发射探测信号和接收分析探测信号的过程。
所述设备发现过程， 包括发射探测信号和接收分析探测信号的过程。 所述探测信号可能包括终端间的身份验证信息、 信道参考信号， 或者还包 括数据信息等。
步驟 406:终端 UE2和 UE1分别向网络侧 D2D控制模块反馈探测结果， 所述探测结果可包括信道质量信息 , 所需的最小功率等信息。
步驟 407: D2D控制模块根据反馈的探测结果判断是否执行直接通信 与蜂窝网络通信间切换， 如果不满足切换条件， 则向 UE2反馈拒绝直接通 信的消息， 结束处理流程； 如果满足切换条件， 则执行步驟 408。
所述切换条件可以包括信道质量信息， 还可以包括 D2D通信是否提高 小区吞吐量、 D2D通信是否结束等信息。 若信道质量较差， 小区吞吐量降 低， 或 D2D通信是否结束， 则切换为蜂窝网络通信。
步驟 408: D2D控制模块向 UE2和 UE1分别发送配置为通知 UE2和 UE1建立直接通信的消息， 并对 UE2和 UE1进行功率控制， 所述消息可以 包括直接通信所需的时频资源和终端初始功率等信息。
步驟 409: UE1和 UE2之间建立 D2D通信链路， 并利用所述 D2D通 信链路， 进行直接通信。
终端间直接通信可以通过与小区用户共享资源来提高频谱的利用率， 它还能减轻蜂窝网络的负担、 减少移动终端的电池功耗、 增加比特速率、 提高网络基础设施故障的鲁棒性等， 还能支持新型的小范围点对点数据服 务。
同时， 终端间直接通信过程中， 相比于传统的蜂窝通信模式不需要通 过核心网的参与， 因此减少了和基站通信的负担， 并节省了所占用的通信 资源。 终端间直接通信的技术研究和实施对于通信技术的发展具有非常重 要的意义。
图 5是本发明实施例提供的在没有蜂窝网络参与下建立 D2D通信的流 程示意图， 在没有蜂窝网络的参与下， 终端周期性地发起 D2D通信请求或 者有用户触发 D2D通信请求时， 终端执行设备发现过程， 并接收反馈回来 的探测结果， 用以判断是否可以建立直接通信。 这种直接通信方式特别适 合于公共安全领域， 例如发生地震、 海嘯等自然灾害时， 即使没有来自无 线基站的覆盖， 用户间也可以直接建立通信联系。 如图 5 所示， 以两个终 端用户 UE1和 UE2建立 D2D通信为例， 步驟包括：
步驟 501 :终端 UE1周期性地或者以手动触发形式发起 D2D通信请求。 步驟 502: 终端 UE2收到所述 D2D通信请求后， 响应所述 D2D通信 请求。
步驟 503: UE1和 UE2执行设备发现过程。
UE1发射探测信号， UE2进行探测信号检测， UE2发射探测信号， UE1 进行探测信号检测， UE1和 UE2相互反馈探测结果。 其中， 探测信号使用 的频率占用的是公共安全专用信道的资源。
步驟 504: 以公共安全专用信道通信或者指定信道进行通信， 建立终端 间直接通信。
从本实施例可知， 终端间直接通信也是为了应对公共安全领域的需要。 在发生大型自然灾害的时候， 如地震、 山洪等， 往往会给现有部署的通信 网络造成毁灭性的破坏， 通信网络信号的消失使得移动终端无法进行必要 的通信， 给救灾带来很大的难度。 而终端间直接通信技术却可以避免这种 情况的出现， 在没有通信网络信号的情况下， 实现终端之间的直接通信， 给救灾救援带来很大的便利性。
本发明实施例中， 终端 UE2在发起 D2D请求后， 终端可以先判断蜂窝 网络的基站信号质量是否可以支持通信， 如果可以支持， 选择蜂窝网络控 制下的 D2D建立流程， 否则， 可以选择无蜂窝网络参与的 D2D建立流程。 如果终端支持手动控制是否需要蜂窝网络控制， 也可以不对基站信号质量 进行判断， 直接手动选择。
尽管上文对本发明进行了详细说明， 但是本发明不限于此， 本技术领 理所作的修改， 都应当理解为落入本发明的保护范围。

Claims

权利要求书
1、 一种终端间直接通信的方法， 所述方法包括：
源终端发起用于与目的终端的直接通信 D2D通信请求；
根据所述 D2D通信请求， 对源终端和目的终端是否能够直接通信进行 检测；
若检测结果为源终端和目的终端能够直接通信， 则建立源终端和目的 终端间的 D2D通信链路；
源终端和目的终端利用所述 D2D通信链路， 进行直接通信。
2、 根据权利要求 1所述的方法， 其中， 所述源终端发起用于与第二终 端的 D2D通信请求， 包括：
源终端向网络侧发起 D2D通信请求， 以便与其请求的目的终端直接通 信。
3、 根据权利要求 2所述的方法， 其中， 所述根据所述 D2D通信请求 对源终端和目的终端是否能够直接通信进行检测， 包括：
网络侧收到所述 D2D通信请求后， 对源终端和目的终端是否能够直接 通信进行预判断；
当网络侧预判断结果为源终端和目的终端能够直接通信时， 网络侧分 别向源终端和目的终端发送用于发现对方的通知消息；
源终端和目的终端利用各自收到的所述通知消息， 分别向对方发送探 测信号， 并检测对方发送的探测信号， 将探测结果发送至网络侧；
网络侧根据所述源终端和所述目的终端的探测结果， 得到源终端和目 的终端是否能够进行直接通信的检测结果。
4、 根据权利要求 3所述的方法， 其中， 所述对源终端和目的终端是否 能够直接通信进行预判断， 包括：
网络侧判断目的终端是否支持直接通信， 且判断所述目的终端是否位 于源终端所在' j、区或相邻小区；
若目的终端支持直接通信， 且位于所述源终端所在小区或相邻小区， 则网络侧的预判断结果为源终端和目的终端能够直接通信； 否则， 网络侧 的预判断结果为源终端和目的终端不能直接通信。
5、 根据权利要求 3所述的方法， 其中， 所述对源终端和目的终端是否 能够直接通信进行预判断， 包括：
网络侧判断目的终端是否支持直接通信， 且与源终端间的距离是否小 于预设距离门限值；
若目的终端支持直接通信， 且与源终端间的距离小于所述预设距离门 限值， 则网络侧的预判断结果为源终端和目的终端能够直接通信， 否则， 网络侧的预判断结果为源终端和目的终端不能直接通信。
6、 根据权利要求 4或 5所述的方法， 其中，
所述通知消息包括： 源终端与目的终端间的身份验证信息和探测信号 所使用的时频资源信息；
所述源终端和目的终端利用各自收到的所述通知消息， 分别向对方发 送探测信号， 并检测对方发送的探测信号， 包括：
源终端和目的终端利用各自收到的所述通知消息， 分别生成包含所述 身份验证信息的探测信号， 并利用所述时频资源信息指示的时频资源， 分 别向对方发送探测信号；
源终端和目的终端利用所述身份验证信息分别检测对方发送的探测信 号， 并对检测到的对方的探测信号进行分析， 得到包含终端探测信息和信 道质量信息的探测结果。
7、 根据权利要求 6所述的方法， 其中， 所述网络侧根据所述源终端和 所述目的终端的探测结果， 得到源终端和目的终端是否能够进行直接通信 的检测结果， 包括： 网络侧根据源终端和目的终端的终端探测信息， 确定源终端和目的终 端是否能够相互探测到对方；
若网络侧确定源终端和目的终端能够相互探测到对方， 则根据源终端 和目的终端上报的信道质量信息， 判断源终端和目的终端是否能够进行直 接通信；
若网络侧确定源终端和目的终端能够进行直接通信， 则生成用于通知 源终端和目的终端进行直接通信的消息， 并分别发送至源终端和目的终端， 所述消息包含用于指示直接通信所使用时频资源的信息和终端初始功率的 信息。
8、 根据权利要求 1所述的方法， 其中， 所述源终端发起用于与目的终 端的 D2D通信请求， 包括：
源终端通过公共安全专用信道发起 D2D 通信请求， 以便与收到所述 D2D通信请求的目的终端进行直接通信。
9、 根据权利要求 8所述的方法， 其中， 所述根据所述 D2D通信请求， 对源终端和目的终端是否能够直接通信进行检测， 包括：
源终端发送所述 D2D通信请求后， 通过公共安全专用信道发送探测信 号， 并检测收到的探测信号；
目的终端收到所述 D2D通信请求后， 通过公共安全专用信道发送探测 信号， 并检测收到的探测信号；
源终端和目的终端通过公共安全专用信道分别将各自的探测结果发送 至对方；
当源终端和目的终端根据双方的探测结果， 确定源终端和目的终端能 够相互探测到对方时， 得到源终端和目的终端能够进行直接通信的检测结 果， 否则， 得到源终端和目的终端不能直接通信的检测结果。
10、 一种终端间直接通信的系统， 所述系统包括： 请求发起模块， 配置为发起用来与目的终端的 D2D通信请求； 检测判断模块， 配置为根据请求发起模块发来的所述 D2D通信请求， 检测源终端和目的终端是否能够直接通信， 并发送检测结果至链路建立模 块；
链路建立模块， 配置为当检测判断模块发来的检测结果为源终端和目 的终端能够直接通信时， 当位于源终端时， 建立与目的终端间的 D2D通信 链路， 当位于目的终端时， 建立与源终端间的 D2D通信链路；
直接通信模块， 配置为利用所述 D2D通信链路， 进行直接通信。
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