WO2015018010A1 - Method for implementing device to device (d2d)-based multicast communication in cellular network - Google Patents

Method for implementing device to device (d2d)-based multicast communication in cellular network Download PDF

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Publication number
WO2015018010A1
WO2015018010A1 PCT/CN2013/081008 CN2013081008W WO2015018010A1 WO 2015018010 A1 WO2015018010 A1 WO 2015018010A1 CN 2013081008 W CN2013081008 W CN 2013081008W WO 2015018010 A1 WO2015018010 A1 WO 2015018010A1
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WO
WIPO (PCT)
Prior art keywords
user equipment
cellular network
coverage
information
multicast group
Prior art date
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PCT/CN2013/081008
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French (fr)
Chinese (zh)
Other versions
WO2015018010A9 (en
Inventor
孟艳
蒋琦
韩锋
Original Assignee
上海贝尔股份有限公司
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 上海贝尔股份有限公司 filed Critical 上海贝尔股份有限公司
Priority to CN201380078311.3A priority Critical patent/CN105409296B/en
Priority to PCT/CN2013/081008 priority patent/WO2015018010A1/en
Priority to TW103126907A priority patent/TW201521494A/en
Publication of WO2015018010A1 publication Critical patent/WO2015018010A1/en
Publication of WO2015018010A9 publication Critical patent/WO2015018010A9/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/327—Power control of multicast channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates to cellular communication networks, and more particularly to a method of implementing device-to-device based multicast communication in a cellular network. Background technique
  • the feasibility study of proximity-based services has determined the valuable services that can be provided by the 3GPP system based on the proximity of user equipments.
  • the identified areas include Public Safety and no-Public-Safe services of interest to operators and users.
  • SI New Study Project
  • D2D LTE device to device
  • - Multicast is a one-way communication from the first user equipment to all other user equipments in the group;
  • - Broadcast is a one-way communication from the first user equipment to all other user equipment.
  • a user distribution scheme for simulation evaluation has been agreed in AN1.
  • the present invention proposes three application scenarios for applying D2D-based multicast communication to an existing cellular network.
  • Scenario 1 All user equipments in a multicast group are within the coverage of the cellular network.
  • the present invention proposes a method for configuring transmission power for an initiating user equipment in a device-to-device communication-based multicast group in a base station of a cellular network, the group All user equipments in the broadcast group are located within the coverage of the cellular network, and the method includes the following steps: A. determining a predetermined transmission power of the initiating user equipment; B. receiving the initiation from the initiating user equipment Receiving, by the user equipment, each of the multicast groups, channel condition information of the user equipment; C. based on the predetermined transmission power and the received channel of the initiating user equipment to each of the multicast groups receiving the user equipment Status information, configuring transmission power for the initiating user equipment; and D. transmitting transmission power configured for the initiating user equipment to the initiating user equipment.
  • the step C further includes: based on the predetermined transmission power, the initiating user equipment to each of the multicast groups receiving the user The channel status information of the device and the uplink interference situation of the initiating user equipment to the neighboring cellular user equipment, and configuring the transmission power for the initiating user equipment.
  • the step A comprises: determining the predetermined transmission power of the initiating user equipment based on a path loss condition between the initiating user equipment and the base station.
  • the channel status information comprises any of the following:
  • the originating user equipment to each of the multicast groups receives HARQ information of the user equipment
  • the initiating user equipment to each of the multicast groups receives path loss information of the user equipment.
  • the present invention provides a method for assisting a base station in a cellular network to configure transmission power for the initiating user equipment in the initiating user equipment in the device-to-device communication-based multicast group, All user devices in the multicast group are located in the In the coverage of the cellular network, the method includes the following steps: a. acquiring channel state information of the user equipment to the user equipment in the multicast group; b. Transmitting, by the device, channel status information of each receiving user equipment in the multicast group to the base station; c. receiving transmission power configured by the base station for the sending user equipment.
  • Scenario 2 Some user equipments in the multicast group are within the coverage of the cellular network, and another part of the user equipment is outside the coverage of the cellular network.
  • the present invention proposes a method for selecting a relay user equipment for device-to-device based multicast communication in a base station of a cellular network, the group of multicast communication
  • a part of the user equipment in the broadcast group is located in the coverage of the cellular network, and another part of the user equipment is located outside the coverage of the cellular network
  • the method includes the following steps: i. receiving each of the plurality of potential user equipments separately The number of user equipments detected by the potential user equipment outside the coverage of the cellular network; and ii. based on the received user equipment detected by each potential user equipment outside the coverage of the cellular network And selecting one user equipment from the plurality of potential user equipments as the relay user equipment.
  • the method further comprises the steps of: receiving, from the plurality of potential user equipments, path loss information of each of the potential user equipments to user equipments located outside the coverage of the cellular network in the multicast group, respectively;
  • the step ii includes: determining, according to each received potential user equipment, the number of user equipments outside the coverage of the cellular network and each of the received potential devices to be located in the multicast group.
  • the path loss information of the user equipment outside the coverage of the cellular network and selecting one user equipment from the plurality of potential user equipments as the relay user equipment.
  • the present invention provides a method for assisting a base station in a cellular network to select a relay user equipment in a potential user equipment in a device-to-device communication-based multicast group, the multicast group.
  • a portion of the user equipment is located within the coverage of the cellular network, and another portion of the user equipment is located outside the coverage of the cellular network, the method comprising the steps of: detecting a user equipment located outside the coverage of the cellular network Transmission of training signaling, the training signaling includes a synchronization sequence, an identity of the user equipment and an information part; and the detected coverage of the cellular network
  • the number of user equipments outside the range is sent to the base station.
  • the method further comprises the steps of: determining path loss information of the potential user equipment to a user equipment in the multicast group that is outside the coverage of the cellular network; and determining the determined potential user equipment to Path loss information of user equipments located outside the coverage of the cellular network in the multicast group is sent to the base station.
  • the present invention provides a user equipment located outside a coverage of a cellular network in a device-to-device communication-based multicast group for assisting a base station in the cellular network to select a relay user equipment.
  • the method the part of the user equipment in the multicast group is located in the coverage of the cellular network, and another part of the user equipment is located outside the coverage of the cellular network, the method includes the following steps: sending training signaling,
  • the training signaling includes a synchronization sequence, an identity of the user equipment, and an information part.
  • Scenario 3 All user equipments in a multicast group are not covered by the cellular network.
  • the present invention provides, in an embodiment, a method for performing multicast transmission in a user equipment in a device-to-device communication-based multicast group, all in the multicast group.
  • the user equipment is not in the coverage of the cellular network, and the method includes the following steps: I. Listening to the carrier to determine whether the carrier is in an idle state; II. If the carrier is in an idle state, at a fixed time In the window, the information is transmitted in a predetermined frame structure, the frame structure comprises two parts, the first part comprises a synchronization sequence, the synchronization sequence is generated by a unique identity of the user equipment, and the second part comprises a reference signal, a CRC check Code and information to be transmitted; III.
  • FIG. 1 illustrates all user equipments in a multicast group according to an embodiment of the present invention. a schematic diagram of the network within the coverage of the cellular network;
  • FIG. 2 is a schematic diagram of a network in which a part of user equipments in a multicast group are outside the coverage of the cellular network within the coverage of the cellular network according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a network in which all user equipments in a multicast group are not in coverage of a cellular network according to an embodiment of the present invention
  • FIG. 4 shows a frame structure diagram for multicast communication in accordance with one embodiment of the present invention
  • FIG. 5 is a flow chart showing a method for user equipment to perform multicast communication according to an embodiment of the present invention.
  • Figure 6 shows a timeline diagram of multicast communication in accordance with one embodiment of the present invention.
  • Application Scenario 1 All user equipments in the multicast group are within the coverage of the cellular network (as shown in Figure 1).
  • the multicast communication between user equipments will be completely controlled by the network side (ie, the base station).
  • the base station transmits data to some user equipments in the multicast group on some dedicated subframes, and schedules other user equipments in the multicast group to receive data on the same dedicated subframe.
  • the base station will also control the QoS (Quality of Service) of the D2D link, such as the HARQ process.
  • QoS Quality of Service
  • the user equipments 21, 22, and 23 constitute a multicast group based on D2D communication, wherein the user equipment 21 is a user equipment, and when the user equipment 21 transmits information, the user equipment 22 And 23 receive the information.
  • User equipment 20 is a cellular user equipment that communicates with base station 10.
  • the base station 10 first determines the predetermined transmission power of the initiating user equipment 21. For example, the base station 10 can determine the predetermined transmission power of the initiating user equipment 21 based on the path loss condition between the initiating user equipment 21 and the present base station 10. When the path loss between the initiating user equipment 21 and the base station 10 is large, correspondingly, the determined value of the predetermined transmission power may also be larger, and vice versa.
  • the base station 10 receives from the initiating user equipment 21 the channel status information of each of the initiating user equipment 21 to the receiving user equipment 22, 23 in the multicast group.
  • the channel condition information may be, for example, HARQ information (e.g., number of HARQs) for initiating user equipment 22, 23 from each of user equipment 21 to the multicast group, or originating user equipment 21 to each of the multicast group receiving user equipment 22 , 23 path loss information, and so on.
  • the initiating user equipment 21 needs to obtain channel status information for each of the receiving user equipments 22, 23 in the multicast group, and transmits the acquired channel status information to the base station 10.
  • the channel status information is path loss information
  • each receiving user equipment 22, 23 needs to separately feed its received power to the initiating user equipment 21, and the initiating user equipment 21 based on its own transmitting power and the received receiving user equipment.
  • the received power of 22, 23 calculates the path loss of the initiating user equipment 21 to each of the receiving user equipments 22, 23, and then transmits the path loss information to the base station 10.
  • the base station 10 configures the transmission power for the initiating user equipment 21 based on the determined predetermined transmission power and the received channel condition information of the user equipment 22, 23 from each of the initiating user equipment 21 to the multicast group.
  • interference may occur between the uplink transmission of the initiating user equipment 21 and the uplink transmission of the cellular user equipment 20, and therefore, in this case, the base station 10 is initiating the user.
  • the device 21 configures the transmission power, it is also necessary to consider initiating the uplink of the user equipment 21 to the neighboring cellular user equipment. Disturbing the situation. That is, the base station 10 simultaneously receives the channel status information of each of the initiating user equipment 21 to the multicast group, and the originating user equipment 21 for its neighboring cells based on the determined predetermined transmission power.
  • the uplink interference situation of the user equipment configures the transmission power for the initiating user equipment 21. If the uplink interference of the initiating user equipment 21 to its neighboring cellular user equipment is large, the transmission power of the initiating user equipment 21 needs to be correspondingly reduced.
  • the base station 10 notifies the originating user device 21 of the transmission power configured to initiate the user equipment 21.
  • the initiating user equipment 21 can perform D2D communication with the receiving user equipment 22, 23 in the multicast group based on the transmission power.
  • Scenario 2 Some user equipments in the multicast group are within the coverage of the cellular network, and another part of the user equipment is outside the coverage of the cellular network (as shown in Figure 2).
  • the user equipment within the coverage of the cellular network can act as a relay user equipment (Relay UE) to relay the network information.
  • the relay user equipment When performing cellular link communication, the relay user equipment is treated as a cellular user equipment; and when performing multicast communication, the relay user equipment is treated as a multicast originating user equipment.
  • the relay user equipment will perform multicast communication based on the indication of the base station, for example, when and where to relay network information. Feedback from user equipment outside the coverage of the cellular network in the multicast group can be treated as another multicast transmission.
  • the problem to be solved is that if two or more user equipments can be used as multicast originating user equipments at the same time, how to select one of the relay user equipments should be selected.
  • user equipments 21, 23, 24 and 25 constitute a multicast group based on D2D communication; in addition, user equipments 22, 24 and 25 also constitute a multicast group based on D2D communication.
  • the user equipment 21 is located within the coverage of the cellular network, and the user equipments 23, 24, and 25 are located outside the coverage of the cellular network; in the second multicast group, the user equipment 22 is located in the cellular network. Within the coverage, user devices 24 and 25 are located outside of the coverage of the cellular network.
  • the base station 10 selects one of the potential user equipments 21 and 22 as the relay user equipment.
  • Training signaling is separately sent for requesting information from the network.
  • the training sequence includes a synchronization sequence, an identity of the user equipment, and an information content portion.
  • Each user equipment located outside the coverage of the cellular network can send training signaling on a predetermined carrier. If the cellular uplink transmission uses the same carrier as the D2D uplink transmission, each user equipment can listen to the carrier for a period of time before sending the training signaling, thereby avoiding collision.
  • Each of the potential user equipments 21, 22 respectively detects the transmission of training signaling of the user equipment located outside the coverage of the cellular network. Specifically, each potential user equipment separately receives the training signaling and resolves the identity of the user equipment from the training signaling, and then determines the detectable based on the number of the identity identifiers of the different user equipments that are solved. The number of user devices that are outside the coverage of the cellular network.
  • each potential user equipment 21, 22 transmits its respective detected number of user equipments located outside the coverage of the cellular network to the base station 10.
  • the base station 10 selects one user equipment from the two potential user equipments 21 and 22 as the relay user equipment based on the number of user equipments detected by each of the potential user equipments 21 and 22 that are located outside the coverage of the cellular network. .
  • the base station 10 can select a potential user equipment capable of detecting a greater number of user equipments located outside the coverage of the cellular network as the relay user equipment.
  • each potential user equipment 21, 22 can also determine its path loss information to the user equipment outside the coverage of the cellular network in the multicast group, and send the determined path loss information to the base station 10.
  • the base station 10 detects the number of user equipments located outside the coverage of the cellular network and each of the received potential user equipments in the multicast group based on the received each potential user equipment 21, 22.
  • the path loss information of the user equipment outside the range is selected from the two potential user equipments 21 and 22 as the relay user equipment.
  • Scenario 3 All user equipments in a multicast group are not covered by the cellular network.
  • Figure 4 shows an example of a new frame structure.
  • the frame of the present invention is divided into two parts.
  • the first part of the frame is a synchronization sequence.
  • the synchronization sequence can be generated by a unique identity of the user equipment. Since the synchronization and multicast communication are limited only in the area of one cell, which is spread in a wave manner by multicast transmission, the uniqueness of the identity of the user equipment only needs to be limited to a limited number of user equipments.
  • the second part of the frame is the information that the user equipment wants to transmit. It can be new data transmitted for the first time, or ACK/NACK information about the last time it was received from other user equipment.
  • the information part ie, the second part of the frame
  • some special markings eg, user equipment detected during reception
  • the identity should be inserted into the ACK/NACK message.
  • the reference signal should also be inserted into the ACK/NACK information.
  • the problem of conflict avoidance needs to be considered.
  • the conflict between the transmissions of each node has been considered.
  • Some methods of carrier sensing have also been proposed for avoiding potential collisions. Since there is no need to look for dedicated reception for transmission for multicast communication, this means that no handshake process is required before the information is transmitted, so the manner of multicast communication can be designed in a simpler manner.
  • the multicast transmission method will be described below with reference to FIGS. 5 and 6.
  • step S501 the user equipment 30 listens to the carrier to determine whether the carrier is in an idle state.
  • the first threshold may be preset, and the user equipment 30 determines whether the idle state of the carrier exceeds the first threshold. If the first threshold is exceeded, the subsequent step S502 is performed, if the After a threshold, the carrier is re-started to listen.
  • step S502 the user equipment 30 transmits information in the frame structure shown in FIG. 4 within a fixed time window. What needs to be explained here is that in order to maintain equality, each user equipment can only The carrier is occupied in a fixed time window. If the information to be transmitted by the user equipment is greater than the read fixed time window, the read carrier needs to be re-listened again to seek a transmission opportunity.
  • step S503 after the fixed time window arrives, the user equipment 30 stops transmitting the information. While the user equipment 30 stops transmitting information, it can listen to the carrier to receive information from other user equipments 31 and 32 in the multicast group.
  • step S503 after the user equipment 30 stops transmitting information for a predetermined length of time, if it still has information to transmit (for example, the user equipment 30 did not transmit all the information in the fixed time window during the last transmission), then The above steps S501-503 are continued.
  • the second threshold value may be preset, and the user equipment 30 determines whether the length of time for stopping the transmission of the information reaches the second threshold value. If the second threshold value is reached, the above steps S501-503 are continued.

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Abstract

Provided in the present invention are three application scenes for implementing D2D (device to device)-based multicast communication in a cellular network. Application scene 1: all user equipment in a multicast group are within the coverage of the cellular network, and for the application scene, provided is a method for configuring transmission power of initiating user equipment in the multicast group. Application scene 2: part of the user equipment in the multicast group are within the coverage of the cellular network, the other part of the user equipment are beyond the coverage of the cellular network, and for the application scene, provided is a method for selecting a relay user device. Application scene 3: all the user equipment in the multicast group are not within the coverage of the cellular network, and for the application scene, provided is a method for multicast transmission.

Description

在蜂窝网络中实现 基于设备到设备的组播通信的方法  Method for implementing device-to-device multicast communication in a cellular network
技术领域 Technical field
本发明涉及蜂窝通信网络， 尤其涉及在蜂窝网络中实现基于设备 到设备的组播通信的方法。 背景技术  The present invention relates to cellular communication networks, and more particularly to a method of implementing device-to-device based multicast communication in a cellular network. Background technique
目前， 基于邻近性的业务（Ρ —Ρπ^ε, ΤΙ 22.803 ) 的可行性研究 已经基于用户设备相互邻近确定了能够由 3GPP***提供的有价值业 务。 所确定的区域包括运营商和用户感兴趣的公共安全 （Public Safety )和非公共安全（ no-Public- Safety )业务。 在 RAN全体会议 #58 期间， LTE设备到设备 ( device to device, D2D ) 通信的相应的新研 究项目 （ Study Item, SI ) 已经被包括在 Rel-12的讨论日程中。  At present, the feasibility study of proximity-based services (Ρ-Ρπ^ε, ΤΙ 22.803) has determined the valuable services that can be provided by the 3GPP system based on the proximity of user equipments. The identified areas include Public Safety and no-Public-Safe services of interest to operators and users. During the RAN Plenary Session #58, a corresponding New Study Project (SI) for LTE device to device (D2D) communication has been included in the Rel-12 discussion agenda.
在之前的 RAN1 #73会议期间， 已经提出了组播通信 （ groupcast communication )的新的观点。 与现有的蜂窝通信相比， 組播通信的下 列特殊特性已经在 RAN1中达成一致：  During the previous RAN1 #73 conference, a new perspective on groupcast communication has been proposed. Compared with existing cellular communications, the following special features of multicast communication have been agreed in RAN1:
• 对于组播和广播通信， 发现（discovery )并非是一个需要的步 骤；  • For multicast and broadcast communications, discovery is not a required step;
• 对于组播和广播通信， 并未假定组内的所有接收用户设备都 相互邻近；  • For multicast and broadcast communications, it is not assumed that all receiving user equipments in the group are adjacent to each other;
• 对于仿真目的，  • For simulation purposes,
- 组播是从第一用户设备到该组内的所有其他用户设备的单 向通信；  - Multicast is a one-way communication from the first user equipment to all other user equipments in the group;
- 广播是从第一用户设备到所有其他用户设备的单向通信。 此外，关于仿真评估的一个用户分布方案已经在 AN1中达成一 致。  - Broadcast is a one-way communication from the first user equipment to all other user equipment. In addition, a user distribution scheme for simulation evaluation has been agreed in AN1.
然而， 目前尚无关于在现有蜂窝网络中如何实现基于 D2D 的組 播通信的讨论。 发明内容 However, there is currently no discussion on how to implement D2D-based multicast communication in existing cellular networks. Summary of the invention
基于此， 本发明提出了将基于 D2D 的组播通信应用于现有蜂窝 网络的三种应用场景。  Based on this, the present invention proposes three application scenarios for applying D2D-based multicast communication to an existing cellular network.
应用场景 1 : 组播组中的所有用户设备均在蜂窝网络的覆盖范围 内  Scenario 1 : All user equipments in a multicast group are within the coverage of the cellular network.
对于该应用场景 1 , 本发明在一个实施例中， 提出了一种在蜂窝 网络的基站中用于为基于设备到设备通信的組播组中的发起用户设 备配置传输功率的方法， 所述组播组中的所有用户设备均位于所述蜂 窝网络的覆盖范围内， 所述方法包括以下步骤： A. 确定所述发起用 户设备的预定传输功率； B. 从所述发起用户设备处接收该发起用户 设备至所述组播组中每一个接收用户设备的信道状况信息； C. 基于 所述预定传输功率以及接收到的所述发起用户设备至所述组播组中 每一个接收用户设备的信道状况信息， 为所述发起用户设备配置传输 功率； 以及 D. 将为所述发起用户设备配置的传输功率发送至所述发 起用户设备。  For this application scenario 1, the present invention, in one embodiment, proposes a method for configuring transmission power for an initiating user equipment in a device-to-device communication-based multicast group in a base station of a cellular network, the group All user equipments in the broadcast group are located within the coverage of the cellular network, and the method includes the following steps: A. determining a predetermined transmission power of the initiating user equipment; B. receiving the initiation from the initiating user equipment Receiving, by the user equipment, each of the multicast groups, channel condition information of the user equipment; C. based on the predetermined transmission power and the received channel of the initiating user equipment to each of the multicast groups receiving the user equipment Status information, configuring transmission power for the initiating user equipment; and D. transmitting transmission power configured for the initiating user equipment to the initiating user equipment.
有利的， 如果设备到设备上行传输与蜂窝上行传输复用相同的资 源， 则所述步骤 C还包括： 基于所述预定传输功率、 所述发起用户设 备至所述组播组中每一个接收用户设备的信道状况信息以及所述发 起用户设备对其相邻的蜂窝用户设备的上行干扰情况， 为所述发起用 户设备配置传输功率。  Advantageously, if the device-to-device uplink transmission multiplexes the same resources as the cellular uplink transmission, the step C further includes: based on the predetermined transmission power, the initiating user equipment to each of the multicast groups receiving the user The channel status information of the device and the uplink interference situation of the initiating user equipment to the neighboring cellular user equipment, and configuring the transmission power for the initiating user equipment.
有利的， 所述步骤 A包括： 基于所述发起用户设备与所述基站之 间的路径损耗情况， 确定所述发起用户设备的所述预定传输功率。  Advantageously, the step A comprises: determining the predetermined transmission power of the initiating user equipment based on a path loss condition between the initiating user equipment and the base station.
有利的， 所述信道状况信息包括以下任一种：  Advantageously, the channel status information comprises any of the following:
- 所述发起用户设备至所述组播组中每一个接收用户设备的 HARQ信息；  - the originating user equipment to each of the multicast groups receives HARQ information of the user equipment;
- 所述发起用户设备至所述组播组中每一个接收用户设备的路 径损耗信息。  - the initiating user equipment to each of the multicast groups receives path loss information of the user equipment.
本发明在另一个实施例中， 提出了一种在基于设备到设备通信的 组播组中的发起用户设备中用于辅助蜂窝网络中的基站为本发起用 户设备配置传输功率的方法， 所述组播組中的所有用户设备均位于所 述蜂窝网络的覆盖范围内， 所述方法包括以下步骤： a. 获取所述发 起用户设备至所述组播组中每一个接收用户设备的信道状况信息； b. 将所获取的所述发起用户设备至所述组播组中每一接收用户设备 的信道状况信息发送至所述基站； c. 接收来自所述基站的为所述发 送用户设备配置的传输功率。 In another embodiment, the present invention provides a method for assisting a base station in a cellular network to configure transmission power for the initiating user equipment in the initiating user equipment in the device-to-device communication-based multicast group, All user devices in the multicast group are located in the In the coverage of the cellular network, the method includes the following steps: a. acquiring channel state information of the user equipment to the user equipment in the multicast group; b. Transmitting, by the device, channel status information of each receiving user equipment in the multicast group to the base station; c. receiving transmission power configured by the base station for the sending user equipment.
应用场景 2: 组播组中的一部分用户设备在蜂窝网络的覆盖范围 内， 另一部分用户设备在蜂窝网络的覆盖范围外  Scenario 2: Some user equipments in the multicast group are within the coverage of the cellular network, and another part of the user equipment is outside the coverage of the cellular network.
对于谅应用场景 2, 本发明在一个实施例中， 提出了一种在蜂窝 网络的基站中用于为基于设备到设备的组播通信选择中继用户设备 的方法， 所述組播通信的组播组中的一部分用户设备位于所述蜂窝网 络的覆盖范围内， 另一部分用户设备位于所述蜂窝网絡的覆盖范围 外， 所述方法包括以下步骤： i. 分别从多个***设备处接收每个 ***设备检测到的在所述蜂窝网络覆盖范围外的用户设备的个 数； 以及 ii. 基于接收到的每个***设备检测到的在所述蜂窝网 络覆盖范围外的用户设备的个数， 从所述多个***设备中选择一 个用户设备作为中继用户设备。  For the application scenario 2, the present invention, in one embodiment, proposes a method for selecting a relay user equipment for device-to-device based multicast communication in a base station of a cellular network, the group of multicast communication A part of the user equipment in the broadcast group is located in the coverage of the cellular network, and another part of the user equipment is located outside the coverage of the cellular network, and the method includes the following steps: i. receiving each of the plurality of potential user equipments separately The number of user equipments detected by the potential user equipment outside the coverage of the cellular network; and ii. based on the received user equipment detected by each potential user equipment outside the coverage of the cellular network And selecting one user equipment from the plurality of potential user equipments as the relay user equipment.
有利的， 上述方法还包括以下步骤： 分别从所述多个***设 备处接收每个***设备至所述组播组中位于所述蜂窝网絡覆盖 范围外的用户设备的路径损耗信息； 其中， 所述步骤 ii包括： 基于接 收到的每个***设备检测到的在所述蜂窝网络覆盖范围外的用 户设备的个数以及接收到的每个潜在用 设备至所述组播组中位于 所述蜂窝网络覆盖范围外的用户设备的路径损耗信息， 从所述多个潜 在用户设备中选择一个用户设备作为中继用户设备。  Advantageously, the method further comprises the steps of: receiving, from the plurality of potential user equipments, path loss information of each of the potential user equipments to user equipments located outside the coverage of the cellular network in the multicast group, respectively; The step ii includes: determining, according to each received potential user equipment, the number of user equipments outside the coverage of the cellular network and each of the received potential devices to be located in the multicast group. The path loss information of the user equipment outside the coverage of the cellular network, and selecting one user equipment from the plurality of potential user equipments as the relay user equipment.
本发明在另一个实施例中，提出了一种在基于设备到设备通信的 组播组中的***设备中用于辅助蜂窝网络中的基站选择中继用 户设备的方法， 所述组播组中的一部分用户设备位于所述蜂窝网络的 覆盖范围内， 另一部分用户设备位于所述蜂窝网络的覆盖范围外， 所 述方法包括以下步骤： 检测来自位于所述蜂窝网络覆盖范围外的用户 设备的训练信令的传输， 所述训练信令包括同步序列， 所述用户设备 的身份标识以及信息部分； 以及将所检测到的位于所述蜂窝网络覆盖 范围外的用户设备的个数发送至所述基站。 In another embodiment, the present invention provides a method for assisting a base station in a cellular network to select a relay user equipment in a potential user equipment in a device-to-device communication-based multicast group, the multicast group. A portion of the user equipment is located within the coverage of the cellular network, and another portion of the user equipment is located outside the coverage of the cellular network, the method comprising the steps of: detecting a user equipment located outside the coverage of the cellular network Transmission of training signaling, the training signaling includes a synchronization sequence, an identity of the user equipment and an information part; and the detected coverage of the cellular network The number of user equipments outside the range is sent to the base station.
有利的， 上述方法还包括以下步骤： 确定所述***设备至所 述组播组中位于所述蜂窝网絡覆盖范围外的用户设备的路径损耗信 息； 以及将所确定的所述***设备至所述组播組中位于所述蜂窝 网络覆盖范围外的用户设备的路径损耗信息发送至所述基站。  Advantageously, the method further comprises the steps of: determining path loss information of the potential user equipment to a user equipment in the multicast group that is outside the coverage of the cellular network; and determining the determined potential user equipment to Path loss information of user equipments located outside the coverage of the cellular network in the multicast group is sent to the base station.
本发明在又一个实施例中，提出了一种在基于设备到设备通信的 组播组中的位于蜂窝网絡覆盖范围外的用户设备中用于辅助所述蜂 窝网絡中的基站选择中继用户设备的方法， 所述组播组中的一部分用 户设备位于所述蜂窝网絡的覆盖范围内， 另一部分用户设备位于所述 蜂窝网络的覆盖范围外， 所述方法包括以下步骤： 发送训练信令， 所 述训练信令包括同步序列， 所述用户设备的身份标识以及信息部分。  In still another embodiment, the present invention provides a user equipment located outside a coverage of a cellular network in a device-to-device communication-based multicast group for assisting a base station in the cellular network to select a relay user equipment. The method, the part of the user equipment in the multicast group is located in the coverage of the cellular network, and another part of the user equipment is located outside the coverage of the cellular network, the method includes the following steps: sending training signaling, The training signaling includes a synchronization sequence, an identity of the user equipment, and an information part.
应用场景 3: 组播组中的所有用户设备均不在蜂窝网络的覆盖范 围内  Scenario 3: All user equipments in a multicast group are not covered by the cellular network.
对于该应用场景 3, 本发明在一个实施例中， 提出了一种在基于 设备到设备通信的组播组中的用户设备中用于进行组播传输的方法， 所述组播组中的所有用户设备均不在蜂窝网络的覆盖范围内， 所述方 法包括以下步骤： I. 对载波进行侦听以判断所述载波是否处于空闲 状态； II. 如杲所述载波处于空闲状态， 则在固定时间窗内， 以预定 的帧结构传输信息，所述帧结构包括两部分，第一部分包括同步序列， 所述同步序列由所述用户设备的唯一身份标识生成， 第二部分包括参 考信号， CRC校验码和待传输信息； III. 当所述固定时间窗到达后， 停止传输信息， 并对所述载波进行侦听以接收来自所述组播组中其他 用户设备的信息； 以及 IV. 当停止传输信息达到预定时间长度后， 如果仍有信息需要传输， 则继续执行上述步骤 I至 III。  For the application scenario 3, the present invention provides, in an embodiment, a method for performing multicast transmission in a user equipment in a device-to-device communication-based multicast group, all in the multicast group. The user equipment is not in the coverage of the cellular network, and the method includes the following steps: I. Listening to the carrier to determine whether the carrier is in an idle state; II. If the carrier is in an idle state, at a fixed time In the window, the information is transmitted in a predetermined frame structure, the frame structure comprises two parts, the first part comprises a synchronization sequence, the synchronization sequence is generated by a unique identity of the user equipment, and the second part comprises a reference signal, a CRC check Code and information to be transmitted; III. when the fixed time window arrives, stop transmitting information, and listen to the carrier to receive information from other user equipments in the multicast group; and IV. when the transmission is stopped After the information reaches the predetermined length of time, if there is still information to be transmitted, the above steps I to III are continued.
附图说明 DRAWINGS
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述， 本发明的其它特征、 目的和优点将会变得更加明显：  Other features, objects, and advantages of the present invention will become apparent from the Detailed Description of the Description
图 1 示出了根据本发明的一个实施例的组播组中所有用户设备均 在蜂窝网絡的覆盖范围内的网絡示意图； FIG. 1 illustrates all user equipments in a multicast group according to an embodiment of the present invention. a schematic diagram of the network within the coverage of the cellular network;
图 2示出了根据本发明的一个实施例的组播组中一部分用户设备 在蜂窝网络的覆盖范围内另一部分用户设备在蜂窝网络的覆盖范围 外的网络示意图；  2 is a schematic diagram of a network in which a part of user equipments in a multicast group are outside the coverage of the cellular network within the coverage of the cellular network according to an embodiment of the present invention;
图 3示出了根据本发明的一个实施例的组播组中所有用户设备均 不在蜂窝网络的覆盖范围内的网络示意图；  3 is a schematic diagram of a network in which all user equipments in a multicast group are not in coverage of a cellular network according to an embodiment of the present invention;
图 4示出了根据本发明的一个实施例的用于组播通信的帧结构示 意图；  4 shows a frame structure diagram for multicast communication in accordance with one embodiment of the present invention;
图 5示出了根据本发明的一个实施例的用户设备进行组播通信的 方法流程图； 以及  FIG. 5 is a flow chart showing a method for user equipment to perform multicast communication according to an embodiment of the present invention; and
图 6 示出了根据本发明的一个实施例的组播通信的时间线 ( timeline ) 示意图。  Figure 6 shows a timeline diagram of multicast communication in accordance with one embodiment of the present invention.
在图中， 相同或类似的附图标记表示相同或相对应的部件或特征。 具体实施方式  In the figures, the same or similar reference numerals indicate the same or corresponding parts or features. detailed description
在以下优选的实施例的具体描述中， 将参考构成本发明一部分的 所附的附图。 所附的附图通过示例的方式示出了能够实现本发明的特 定的实施例。 示例的实施例并不旨在穷尽根据本发明的所有实施例。 可以理解， 在不偏离本发明的范围的前提下， 可以利用其他实施例， 也可以进行结构性或者逻辑性的修改。 因此， 以下的具体描述并非限 制性的， 且本发明的范围由所附的权利要求所限定。  In the detailed description of the preferred embodiments that follow, reference is made to the accompanying drawings which form a part of the invention. The attached drawings illustrate specific embodiments that are capable of implementing the invention. The exemplary embodiments are not intended to be exhaustive of all embodiments in accordance with the invention. It is to be understood that other embodiments may be utilized and structural or logical modifications may be made without departing from the scope of the invention. Therefore, the following detailed description is not to be considered as limiting
以下将分别针对三种应用场景对本发明的各实施例进行详细描述。 应用场景 1 : 组播组中的所有用户设备均在蜂窝网络的覆盖范围 内 （如图 1所示）  The embodiments of the present invention will be described in detail below for three application scenarios. Application Scenario 1 : All user equipments in the multicast group are within the coverage of the cellular network (as shown in Figure 1).
对于该应用场景， 将由网絡侧（也即基站）完全控制用户设备之 间的组播通信。基站将调度组播组中的某一用户设备在一些专用子帧 上传输数据， 并调度谅组播组中的其他一些用户设备在相同的专用子 帧上接收数据。 此外， 基站也将控制 D2D链路的 QoS (业务质量）， 例如 HARQ过程。 对于该应用场景， 如果 D2D链路和蜂窝链路之间 的资源能够复用， 那么需要解决组播通信的功率设置问题， 以消除蜂 窝链路和 D2D链路之间的干扰。 For this application scenario, the multicast communication between user equipments will be completely controlled by the network side (ie, the base station). The base station transmits data to some user equipments in the multicast group on some dedicated subframes, and schedules other user equipments in the multicast group to receive data on the same dedicated subframe. In addition, the base station will also control the QoS (Quality of Service) of the D2D link, such as the HARQ process. For this application scenario, if resources between the D2D link and the cellular link can be multiplexed, it is necessary to solve the power setting problem of the multicast communication to eliminate the bee. Interference between the socket link and the D2D link.
以下参照图 1 , 对基站配置 D2D链路（也即发起用户设备）的传 输功率的方法进行详细描述。 在图 1所示出的网絡拓朴中， 用户设备 21 , 22和 23构成一个基于 D2D通信的组播组， 其中， 用户设备 21 为发起用户设备， 当用户设备 21发送信息时， 用户设备 22和 23接 收信息。 用户设备 20为蜂窝用户设备， 其与基站 10之间进行通信。  The method of configuring the transmission power of the D2D link (i.e., initiating the user equipment) by the base station will be described in detail below with reference to FIG. In the network topology shown in FIG. 1, the user equipments 21, 22, and 23 constitute a multicast group based on D2D communication, wherein the user equipment 21 is a user equipment, and when the user equipment 21 transmits information, the user equipment 22 And 23 receive the information. User equipment 20 is a cellular user equipment that communicates with base station 10.
基站 10首先确定发起用户设备 21的预定传输功率。 例如， 基站 10可以基于发起用户设备 21与本基站 10之间的路径损耗情况来确定 发起用户设备 21的预定传输功率。 当发起用户设备 21与基站 10之 间的路径损耗较大时，相应的，所确定的预定传输功率的值也可较大， 反之亦然。  The base station 10 first determines the predetermined transmission power of the initiating user equipment 21. For example, the base station 10 can determine the predetermined transmission power of the initiating user equipment 21 based on the path loss condition between the initiating user equipment 21 and the present base station 10. When the path loss between the initiating user equipment 21 and the base station 10 is large, correspondingly, the determined value of the predetermined transmission power may also be larger, and vice versa.
然后， 基站 10从发起用户设备 21处接收该发起用户设备 21至 组播组中每一个接收用户设备 22， 23 的信道状况信息。 谅信道状况 信息可以是例如发起用户设备 21 至组播组中每一个接收用户设备 22， 23的 HARQ信息 （例如， HARQ次数）， 或者发起用户设备 21 至组播组中每一个接收用户设备 22, 23的路径损耗信息， 等等。  Then, the base station 10 receives from the initiating user equipment 21 the channel status information of each of the initiating user equipment 21 to the receiving user equipment 22, 23 in the multicast group. The channel condition information may be, for example, HARQ information (e.g., number of HARQs) for initiating user equipment 22, 23 from each of user equipment 21 to the multicast group, or originating user equipment 21 to each of the multicast group receiving user equipment 22 , 23 path loss information, and so on.
换言之， 发起用户设备 21 需要获取其至组播组中每一接收用户 设备 22， 23 的信道状况信息， 并将所获取的信道状况信息发送至基 站 10。 当信道状况信息为路径损耗信息的情形下，每一个接收用户设 备 22, 23需分别将其接收功率反馈给发起用户设备 21 , 发起用户设 备 21基于其自身的发射功率以及接收到的接收用户设备 22, 23的接 收功率， 计算出本发起用户设备 21至每一个接收用户设备 22， 23的 路径损耗， 然后将该路径损耗信息发送给基站 10。  In other words, the initiating user equipment 21 needs to obtain channel status information for each of the receiving user equipments 22, 23 in the multicast group, and transmits the acquired channel status information to the base station 10. When the channel status information is path loss information, each receiving user equipment 22, 23 needs to separately feed its received power to the initiating user equipment 21, and the initiating user equipment 21 based on its own transmitting power and the received receiving user equipment. The received power of 22, 23 calculates the path loss of the initiating user equipment 21 to each of the receiving user equipments 22, 23, and then transmits the path loss information to the base station 10.
接着， 基站 10基于所确定的预定传输功率以及接收到的发起用 户设备 21至组播组中每一个接收用户设备 22, 23的信道状况信息， 为发起用户设备 21配置传输功率。  Next, the base station 10 configures the transmission power for the initiating user equipment 21 based on the determined predetermined transmission power and the received channel condition information of the user equipment 22, 23 from each of the initiating user equipment 21 to the multicast group.
当 D2D上行传输与蜂窝上行传输复用相同的资源时， 发起用户 设备 21的上行传输与蜂窝用户设备 20的上行传输之间可能会产生干 扰， 因此， 在该情形下， 基站 10在为发起用户设备 21配置传输功率 时， 还需要考虑发起用户设备 21对其相邻的蜂窝用户设备的上行干 扰情况。 也就是说， 基站 10 同时基于所确定的预定传输功率， 接收 到的发起用户设备 21至组播组中每一个接收用户设备 22， 23的信道 状况信息以及发起用户设备 21 对其相邻的蜂窝用户设备的上行干扰 情况， 为发起用户设备 21配置传输功率。 如果发起用户设备 21对其 相邻的蜂窝用户设备的上行干扰较大， 则需要相应的降低发起用户设 备 21的传输功率。 When the D2D uplink transmission and the cellular uplink transmission are multiplexed with the same resources, interference may occur between the uplink transmission of the initiating user equipment 21 and the uplink transmission of the cellular user equipment 20, and therefore, in this case, the base station 10 is initiating the user. When the device 21 configures the transmission power, it is also necessary to consider initiating the uplink of the user equipment 21 to the neighboring cellular user equipment. Disturbing the situation. That is, the base station 10 simultaneously receives the channel status information of each of the initiating user equipment 21 to the multicast group, and the originating user equipment 21 for its neighboring cells based on the determined predetermined transmission power. The uplink interference situation of the user equipment configures the transmission power for the initiating user equipment 21. If the uplink interference of the initiating user equipment 21 to its neighboring cellular user equipment is large, the transmission power of the initiating user equipment 21 needs to be correspondingly reduced.
最后， 基站 10将为发起用户设备 21配置的传输功率通知发起用 户设备 21。 发起用户设备 21可以基于该发射功率与组播组中的接收 用户设备 22, 23进行 D2D通信。  Finally, the base station 10 notifies the originating user device 21 of the transmission power configured to initiate the user equipment 21. The initiating user equipment 21 can perform D2D communication with the receiving user equipment 22, 23 in the multicast group based on the transmission power.
应用场景 2: 组播组中的一部分用户设备在蜂窝网络的覆盖范围 内， 另一部分用户设备在蜂窝网絡的覆盖范围外 （如图 2所示）  Scenario 2: Some user equipments in the multicast group are within the coverage of the cellular network, and another part of the user equipment is outside the coverage of the cellular network (as shown in Figure 2).
对于该应用场景， 如果蜂窝网络中的基站需要传输信号给其覆盖 范围外的用户设备， 那么谅蜂窝网络覆盖范围内的用户设备可以充当 中继用户设备（Relay UE ) 来中继谅网络信息。 当进行蜂窝链路通信 时， 该中继用户设备被当做蜂窝用户设备； 而当进行组播通信时， 谅 中继用户设备则被当做组播发起用户设备。 中继用户设备将基于基站 的指示进行组播通信， 例如， 在何时以及在何处中继网络信息。 组播 组中在蜂窝网络覆盖范围外的用户设备的反馈能够被当做另一次的 组播传输。 对于该应用场景， 需要解决的问题是如果同时有两个或两 个以上的用户设备能够被用作组播发起用户设备， 那么应谚如何从中 选择一个中继用户设备。  For this application scenario, if a base station in a cellular network needs to transmit a signal to a user equipment outside its coverage area, the user equipment within the coverage of the cellular network can act as a relay user equipment (Relay UE) to relay the network information. When performing cellular link communication, the relay user equipment is treated as a cellular user equipment; and when performing multicast communication, the relay user equipment is treated as a multicast originating user equipment. The relay user equipment will perform multicast communication based on the indication of the base station, for example, when and where to relay network information. Feedback from user equipment outside the coverage of the cellular network in the multicast group can be treated as another multicast transmission. For this application scenario, the problem to be solved is that if two or more user equipments can be used as multicast originating user equipments at the same time, how to select one of the relay user equipments should be selected.
以下参照图 2, 对基站选择中继用户设备的方法进行详细描述。 在图 2所示出的网絡拓朴中， 用户设备 21， 23 , 24和 25构成一个基 于 D2D通信的组播组； 此外， 用户设备 22, 24和 25也构成一个基 于 D2D通信的组播组。 在第一个组播组中， 用户设备 21位于蜂窝网 络的覆盖范围内，用户设备 23， 24和 25位于蜂窝网络的覆盖范围外； 在第二个组播组中， 用户设备 22位于蜂窝网络的覆盖范围内， 用户 设备 24和 25位于蜂窝网络的覆盖范围外。 基站 10从***设备 21和 22中选择一个作为中继用户设备。  The method for selecting a relay user equipment by the base station will be described in detail below with reference to FIG. In the network topology shown in FIG. 2, user equipments 21, 23, 24 and 25 constitute a multicast group based on D2D communication; in addition, user equipments 22, 24 and 25 also constitute a multicast group based on D2D communication. . In the first multicast group, the user equipment 21 is located within the coverage of the cellular network, and the user equipments 23, 24, and 25 are located outside the coverage of the cellular network; in the second multicast group, the user equipment 22 is located in the cellular network. Within the coverage, user devices 24 and 25 are located outside of the coverage of the cellular network. The base station 10 selects one of the potential user equipments 21 and 22 as the relay user equipment.
两个组播组中位于蜂窝网络覆盖范围外的用户设备 23 , 24和 25 分别发送训练信令，用于向网络请求信息。训练序列中包括同步序列， 用户设备的身份标识以及信息内容部分。每个位于蜂窝网絡覆盖范围 外的用户设备可以在预定的载波上发送训练信令。如杲蜂窝上行传输 与 D2D上行传输使用相同的载波， 那么每个用户设备在发送训练信 令之前可以先侦听该载波一段时间， 从而避免产生冲突。 User equipment 23, 24 and 25 located outside the coverage of the cellular network in two multicast groups Training signaling is separately sent for requesting information from the network. The training sequence includes a synchronization sequence, an identity of the user equipment, and an information content portion. Each user equipment located outside the coverage of the cellular network can send training signaling on a predetermined carrier. If the cellular uplink transmission uses the same carrier as the D2D uplink transmission, each user equipment can listen to the carrier for a period of time before sending the training signaling, thereby avoiding collision.
每一个***设备 21， 22分别检测这些位于蜂窝网络覆盖范 围外的用户设备的训练信令的传输。 具体的， 每一个***设备分 别接收训练信令并从训练信令中解出用户设备的身份标识， 然后基于 所解出的不同的用户设备的身份标识的个数， 确定其能够检测到的位 于蜂窝网络覆盖范围外的用户设备的个数。  Each of the potential user equipments 21, 22 respectively detects the transmission of training signaling of the user equipment located outside the coverage of the cellular network. Specifically, each potential user equipment separately receives the training signaling and resolves the identity of the user equipment from the training signaling, and then determines the detectable based on the number of the identity identifiers of the different user equipments that are solved. The number of user devices that are outside the coverage of the cellular network.
然后， 每一个***设备 21 , 22分别将其各自检测到的位于 蜂窝网絡覆盖范围外的用户设备的个数发送至基站 10。  Then, each potential user equipment 21, 22 transmits its respective detected number of user equipments located outside the coverage of the cellular network to the base station 10.
基站 10则基于接收到的每一个***设备 21 , 22检测到的位 于蜂窝网絡覆盖范围外的用户设备的个数， 从两个***设备 21 和 22中选择一个用户设备作为中继用户设备。 例如， 基站 10可以选 择能够检测到较多位于蜂窝网络覆盖范围外的用户设备的个数的潜 在用户设备作为中继用户设备。  The base station 10 selects one user equipment from the two potential user equipments 21 and 22 as the relay user equipment based on the number of user equipments detected by each of the potential user equipments 21 and 22 that are located outside the coverage of the cellular network. . For example, the base station 10 can select a potential user equipment capable of detecting a greater number of user equipments located outside the coverage of the cellular network as the relay user equipment.
有利的， 每一***设备 21 , 22 还可以分别确定其至组播组 中位于蜂窝网络覆盖范围外的用户设备的路径损耗信息， 并将所确定 的路径损耗信息发送至基站 10。  Advantageously, each potential user equipment 21, 22 can also determine its path loss information to the user equipment outside the coverage of the cellular network in the multicast group, and send the determined path loss information to the base station 10.
相应的， 基站 10基于接收到的每一个***设备 21 , 22检测 到的位于蜂窝网絡覆盖范围外的用户设备的个数以及接收到的每一 个***设备至组播组中位于蜂窝网絡覆盖范围外的用户设备的 路径损耗信息， 从两个***设备 21和 22中选择一个用户设备作 为中继用户设备。  Correspondingly, the base station 10 detects the number of user equipments located outside the coverage of the cellular network and each of the received potential user equipments in the multicast group based on the received each potential user equipment 21, 22. The path loss information of the user equipment outside the range is selected from the two potential user equipments 21 and 22 as the relay user equipment.
应用场景 3： 组播組中的所有用户设备均不在蜂窝网络的覆盖范 围内  Scenario 3: All user equipments in a multicast group are not covered by the cellular network.
对于该应用场景， 设计了类似波浪形的传输方式（如图 3所示）。 并且， 在此提出了 3条设计原理以使得组播通信能够以简单的方式实 现。 ■ 原理 1: 每一次组播通信都基于载波侦听 For this application scenario, a wave-like transmission method is designed (as shown in Figure 3). Moreover, three design principles are proposed here to enable multicast communication to be implemented in a simple manner. ■ Principle 1: Each multicast communication is based on carrier sense
■ 原理 2: 不设计 HARQ和反馈结构， 反馈能够通过一次新的 组播传输实现  ■ Principle 2: Without designing HARQ and feedback structure, feedback can be achieved through a new multicast transmission.
■ 原理 3:. 无需全局同步， 仅在包括在一次组播传输 /接收内的 有限的用户设备之间保持同步  ■ Principle 3:. No need for global synchronization, only to synchronize between limited user devices included in a multicast transmission/reception
为了适应上述原理， 设计了一种新的帧结构。 图 4示出了新的帧 结构的一个示例。 不同于 LTE帧结构， 本发明的帧被分成两部分。 帧 的第一部分为同步序列， 为了识别用户设备本身， 同步序列可以由用 户设备唯一的身份标识生成。 由于同步和组播通信仅限制在一个小区 的区域内， 其以组播传输呈波浪式扩散， 因此， 用户设备的身份标识 的唯一性仅需要限制在有限数目的用户设备。 帧的第二部分为该用户 设备想要传输的信息。 其可以是第一次传输的新数据， 或者是关于上 一次从其他用户设备接收的情况的 ACK/NACK信息。 如果信息部分 (也即， 帧的第二部分） 用于传输 ACK/NACK信息， 为了区分对于 不同用户设备的 ACK/NACK信息， 那么， 一些特殊标记 （例如在接 收过程中检测到的用户设备的身份标识）应该被***到 ACK/NACK 信息中。 此外， 参考信号也应当被***到 ACK/NACK信息中。  In order to adapt to the above principle, a new frame structure is designed. Figure 4 shows an example of a new frame structure. Unlike the LTE frame structure, the frame of the present invention is divided into two parts. The first part of the frame is a synchronization sequence. To identify the user equipment itself, the synchronization sequence can be generated by a unique identity of the user equipment. Since the synchronization and multicast communication are limited only in the area of one cell, which is spread in a wave manner by multicast transmission, the uniqueness of the identity of the user equipment only needs to be limited to a limited number of user equipments. The second part of the frame is the information that the user equipment wants to transmit. It can be new data transmitted for the first time, or ACK/NACK information about the last time it was received from other user equipment. If the information part (ie, the second part of the frame) is used to transmit ACK/NACK information, in order to distinguish ACK/NACK information for different user equipments, then some special markings (eg, user equipment detected during reception) The identity) should be inserted into the ACK/NACK message. In addition, the reference signal should also be inserted into the ACK/NACK information.
对于该应用场景， 需要考虑的是冲突避免的问题。 事实上， 在 IEEE 802.11 MAC设计中， 已经考虑了每个节点的传输之间的冲突。 也已经提出了一些载波侦听的方法以用于避免潜在的冲突。 由于对于 组播通信而言， 无需为传输寻找专用接收， 这意味着在信息传输之前 无需握手过程， 因此， 组播通信的方式可以以更简单的方式设计。  For this application scenario, the problem of conflict avoidance needs to be considered. In fact, in the IEEE 802.11 MAC design, the conflict between the transmissions of each node has been considered. Some methods of carrier sensing have also been proposed for avoiding potential collisions. Since there is no need to look for dedicated reception for transmission for multicast communication, this means that no handshake process is required before the information is transmitted, so the manner of multicast communication can be designed in a simpler manner.
以下参照图 5和图 6, 对组播传输方法进行描述。  The multicast transmission method will be described below with reference to FIGS. 5 and 6.
首先， 在步骤 S501中， 用户设备 30对载波进行侦听以判断该载波 是否处于空闲状态。 例如， 可以预先设定第一门限值， 用户设备 30判 断谅载波的空闲状态是否超过该第一门限值， 如果超过该第一门限值， 则执行后续步骤 S502, 如果未超过谅第一门限值， 则重新开始对该载波 进行侦听。  First, in step S501, the user equipment 30 listens to the carrier to determine whether the carrier is in an idle state. For example, the first threshold may be preset, and the user equipment 30 determines whether the idle state of the carrier exceeds the first threshold. If the first threshold is exceeded, the subsequent step S502 is performed, if the After a threshold, the carrier is re-started to listen.
在步骤 S502中， 用户设备 30在固定时间窗内， 以图 4示出的帧结 构传输信息。 此处需要说明的是， 为了保持平等性， 每个用户设备仅能 够在一个固定时间窗内占用该载波， 如果用户设备要传输的信息大于读 固定时间窗， 则需要再次重新侦听读载波以寻求传输机会。 In step S502, the user equipment 30 transmits information in the frame structure shown in FIG. 4 within a fixed time window. What needs to be explained here is that in order to maintain equality, each user equipment can only The carrier is occupied in a fixed time window. If the information to be transmitted by the user equipment is greater than the read fixed time window, the read carrier needs to be re-listened again to seek a transmission opportunity.
然后， 在步骤 S503中， 当固定时间窗到达后， 用户设备 30停止传 输信息。 在用户设备 30停止传输信息的期间， 其可以对载波进行侦听 以接收来自组播组中其他用户设备 31和 32的信息。  Then, in step S503, after the fixed time window arrives, the user equipment 30 stops transmitting the information. While the user equipment 30 stops transmitting information, it can listen to the carrier to receive information from other user equipments 31 and 32 in the multicast group.
在步骤 S504中，当用户设备 30停止传输信息达到预定时间长度后， 如果其仍有信息需要传输（例如， 用户设备 30在上一次传输时， 在固 定时间窗内未传输完所有信息）， 则继续执行上述步骤 S501-503。  In step S504, after the user equipment 30 stops transmitting information for a predetermined length of time, if it still has information to transmit (for example, the user equipment 30 did not transmit all the information in the fixed time window during the last transmission), then The above steps S501-503 are continued.
例如， 可以预先设定第二门限值， 用户设备 30判断其停止传输信 息的时间长度是否达到该第二门限值， 如果达到读第二门限值， 则继续 执行上述步骤 S501-503。  For example, the second threshold value may be preset, and the user equipment 30 determines whether the length of time for stopping the transmission of the information reaches the second threshold value. If the second threshold value is reached, the above steps S501-503 are continued.
需要说明的是，上述实施例仅是示范性的，而非对本发明的限制。 任何不背离本发明精神的技术方案均应落入本发明的保护范围之内， 这包括使用在不同实施例中出现的不同技术特征， 装置方法可以进行 组合， 以取得有益效果。 此外， 不应将权利要求中的任何附图标记视 为限制所涉及的权利要求； "包括" 一词不排除其他权利要求或说明 书中未列出的装置或步骤。  It should be noted that the above-described embodiments are merely exemplary and not limiting of the invention. Any technical solution that does not depart from the spirit of the present invention should fall within the scope of the present invention, including the use of different technical features that appear in different embodiments, and the device methods can be combined to achieve a beneficial effect. In addition, any reference signs in the claims should not be construed as limiting the claims. The term "comprising" does not exclude the means or steps that are not listed in the other claims.

Claims

权 利 要 求 书 Claim
1. 一种在蜂窝网絡的基站中用于为基于设备到设备通信的组播 组中的发起用户设备配置传输功率的方法， 所述组播组中的所有用户 设备均位于所述蜂窝网络的覆盖范围内， 所述方法包括以下步骤：A method for configuring transmission power for an initiating user equipment in a device-to-device communication-based multicast group in a base station of a cellular network, where all user equipments in the multicast group are located in the cellular network Within the scope of coverage, the method includes the following steps:
A. 确定所述发起用户设备的预定传输功率； A. determining a predetermined transmission power of the initiating user equipment;
B. 从所述发起用户设备处接收谅发起用户设备至所述组播组中 每一个接收用户设备的信道状况信息；  B. receiving, from the initiating user equipment, channel condition information of each of the receiving user equipments to each of the multicast groups;
C. 基于所述预定传输功率以及接收到的所述发起用户设备至所 述组播组中每一个接收用户设备的信道状况信息， 为所述发起用户设 备配置传输功率；  C. configuring transmission power for the initiating user equipment based on the predetermined transmission power and the received channel status information of the receiving user equipment to each of the multicast groups;
D . 将为所述发起用户设备配置的传输功率发送至所述发起用户 设备。  D. Transmit the transmission power configured for the initiating user equipment to the initiating user equipment.
2. 根椐权利要求 1所述的方法， 其特征在于，如果设备到设备上 行传输与蜂窝上行传输复用相同的资源， 则所述步骤 C还包括：  2. The method of claim 1, wherein the step C further comprises: if the device-to-device uplink transmission multiplexes the same resources as the cellular uplink transmission, the step C further includes:
- 基于所述预定传输功率、 所述发起用户设备至所述组播组中每 一个接收用户设备的信道状况信息以及所述发起用户设备对其相邻 的蜂窝用户设备的上行干扰情况， 为所述发起用户设备配置传输功 率。  Determining, according to the predetermined transmission power, channel condition information of the user equipment to each of the multicast groups, and uplink interference of the initiating user equipment to the neighboring cellular user equipment, The initiating user equipment configures the transmission power.
3. 根据权利要求 1所述的方法， 其特征在于， 所述步骤 A包括： - 基于所述发起用户设备与所述基站之间的路径损耗情况， 确定 所述发起用户设备的所述预定传输功率。  The method according to claim 1, wherein the step A comprises: - determining the predetermined transmission of the initiating user equipment based on a path loss condition between the initiating user equipment and the base station power.
4. 根据权利要求 1或 2中任一项所述的方法，其特征在于， 所述 信道状况信息包括以下任一种：  The method according to any one of claims 1 to 2, wherein the channel status information comprises any one of the following:
- 所述发起用户设备至所述组播组中每一个接收用户设备的 HARQ信息；  - the originating user equipment to each of the multicast groups receives HARQ information of the user equipment;
- 所述发起用户设备至所述组播组中每一个接收用户设备的路 径损耗信息。  - the initiating user equipment to each of the multicast groups receives path loss information of the user equipment.
5. 一种在基于设备到设备通信的组播组中的发起用户设备中用 于辅助蜂窝网络中的基站为本发起用户设备配置传输功率的方法， 所 述组播组中的所有用户设备均位于所述蜂窝网络的覆盖范围内， 所述 方法包括以下步骤： 5. A method for assisting a base station in a cellular network to configure transmission power for an initiating user equipment in an initiating user equipment in a device-to-device communication-based multicast group, All user equipments in the multicast group are located in the coverage of the cellular network, and the method includes the following steps:
a. 莸取所述发起用户设备至所述组播组中每一个接收用户设备 的信道状况信息；  Obtaining, from the initiating user equipment to each of the multicast groups, channel state information of the user equipment;
b. 将所获取的所述发起用户设备至所述组播组中每一接收用户 设备的信道状况信息发送至所述基站；  And transmitting, to the base station, the acquired channel status information of the initiating user equipment to each receiving user equipment in the multicast group;
c. 接收来自所述基站的为所述发送用户设备配置的传输功率。 c. receiving transmission power configured for the transmitting user equipment from the base station.
6. 根据权利要求 5所述的方法，其特征在于， 所述信道状况信息 包括以下任一种： The method according to claim 5, wherein the channel status information comprises any one of the following:
- 所述发起用户设备至所述组播组中每一个接收用户设备的 HARQ信息；  - the originating user equipment to each of the multicast groups receives HARQ information of the user equipment;
- 所述发起用户设备至所述组播组中每一个接收用户设备的路 径损耗信息。  - the initiating user equipment to each of the multicast groups receives path loss information of the user equipment.
7. 一种在蜂窝网络的基站中用于为基于设备到设备的组播通信 选择中继用户设备的方法， 所述组播通信的组播组中的一部分用户设 备位于所述蜂窝网络的覆盖范围内， 另一部分用户设备位于所述蜂窝 网絡的覆盖范围外， 所述方法包括以下步骤：  A method for selecting a relay user equipment for device-to-device based multicast communication in a base station of a cellular network, wherein a part of the user equipment in the multicast group of the multicast communication is located in the coverage of the cellular network Within the scope, another part of the user equipment is located outside the coverage of the cellular network, and the method includes the following steps:
i. 分别从多个***设备处接收每个***设备检测到的 在所述蜂窝网络覆盖范围外的用户设备的个数；  i. receiving, from a plurality of potential user equipments, the number of user equipments detected by each potential user equipment outside the coverage of the cellular network;
ii. 基于接收到的每个***设备检测到的在所述蜂窝网絡覆 盖范围外的用户设备的个数， 从所述多个***设备中选择一个用 户设备作为中继用户设备。  Ii. Select one user device from the plurality of potential user devices as the relay user device based on the received number of user devices detected by each potential user device outside the coverage of the cellular network.
8. 根据权利要求 7 所述的方法， 其特征在于， 所述方法还包括 以下步骤：  8. The method according to claim 7, wherein the method further comprises the following steps:
- 分别从所述多个***设备处接收每个***设备至所 述组播组中位于所述蜂窝网络覆盖范围外的用户设备的路径损耗信 白 ·  Receiving from each of the plurality of potential user equipments a path loss signal of each of the potential user equipments to user equipments outside the coverage of the cellular network in the multicast group, respectively
其中所述步骤 ii包括：  The step ii includes:
- 基于接收到的每个***设备检测到的在所述蜂窝网络覆 盖范围外的用户设备的个数以及接收到的每个***设备至所述 组播组中位于所述蜂窝网络覆盖范围外的用户设备的路径损耗信息， 从所述多个***设备中选择一个用户设备作为中继用户设备。 - based on the received number of user equipments detected by each potential user equipment outside the coverage of the cellular network and each potential user equipment received to the said The path loss information of the user equipment in the multicast group that is located outside the coverage of the cellular network, and selecting one user equipment from the plurality of potential user equipments as the relay user equipment.
9. 一种在基于设备到设备通信的组播组中的***设备中用 于辅助蜂窝网络中的基站选择中继用户设备的方法， 所述组播组中的 一部分用户设备位于所述蜂窝网络的覆盖范围内， 另一部分用户设备 位于所述蜂窝网络的覆盖范围外， 所述方法包括以下步骤：  A method for assisting a base station in a cellular network to select a relay user equipment in a potential user equipment in a device-to-device communication-based multicast group, where a part of user equipments in the multicast group are located in the cellular Within the coverage of the network, another part of the user equipment is located outside the coverage of the cellular network, and the method includes the following steps:
- 检测来自位于所述蜂窝网络覆盖范围外的用户设备的训练信 令的传输， 所述训练信令包括同步序列， 所述用户设备的身份标识以 及信息部分；  - detecting a transmission of a training signal from a user equipment located outside the coverage of the cellular network, the training signaling comprising a synchronization sequence, an identity of the user equipment and an information portion;
- 将所检测到的位于所述蜂窝网絡覆盖范围外的用户设备的个 数发送至所述基站。  - transmitting the detected number of user equipments located outside the coverage of the cellular network to the base station.
10. 根据权利要求 9所述的方法， 其特征在于， 所述方法还包括 以下步骤：  10. The method according to claim 9, wherein the method further comprises the following steps:
- 确定所述***设备至所述组播组中位于所述蜂窝网络覆 盖范围外的用户设备的路径损耗信息；  Determining path loss information of the potential user equipment to user equipment in the multicast group that is outside the coverage of the cellular network;
- 将所确定的所述***设备至所述组播组中位于所述蜂窝 网络覆盖范围外的用户设备的路径损耗信息发送至所述基站。  - transmitting the determined path loss information from the potential user equipment to the user equipment in the multicast group that is outside the coverage of the cellular network to the base station.
11. 一种在基于设备到设备通信的组播组中的位于蜂窝网絡覆盖 范围外的用户设备中用于辅助所述蜂窝网络中的基站选择中继用户 设备的方法， 所述组播组中的一部分用户设备位于所述蜂窝网络的覆 盖范围内， 另一部分用户设备位于所述蜂窝网络的覆盖范围外， 所述 方法包括以下步骤：  A method for assisting a base station in a cellular network to select a relay user equipment in a user equipment outside the coverage of the cellular network in a device-to-device communication-based multicast group, in the multicast group A part of the user equipment is located in the coverage of the cellular network, and another part of the user equipment is located outside the coverage of the cellular network, and the method includes the following steps:
- 发送训练信令， 所述训练信令包括同步序列， 所述用户设备的 身份标识以及信息部分。  - Sending training signaling, the training signaling comprising a synchronization sequence, an identity of the user equipment and an information part.
12. 一种在基于设备到设备通信的组播组中的用户设备中用于 进行组播传输的方法， 所述组播组中的所有用户设备均不在蜂窝网络 的覆盖范围内， 所述方法包括以下步骤：  A method for performing multicast transmission in a user equipment in a device-to-device communication-based multicast group, where all user equipments in the multicast group are not in coverage of the cellular network, the method Includes the following steps:
I. 对载波进行侦听以判断所述载波是否处于空闲状态；  I. Listening to the carrier to determine whether the carrier is in an idle state;
II. 如果所述载波处于空闲状态， 则在固定时间窗内， 以预定的 帧结构传输信息， 所述帧结构包括两部分， 第一部分包括同步序列， 所述同步序列由所述用户设备的唯一身份标识生成， 第二部分包括参 考信号， CRC校验码和待传输信息； II. If the carrier is in an idle state, transmitting information in a predetermined frame structure within a fixed time window, the frame structure comprising two parts, the first part comprising a synchronization sequence, The synchronization sequence is generated by a unique identity of the user equipment, and the second part includes a reference signal, a CRC check code, and information to be transmitted;
III. 当所述固定时间窗到达后， 停止传输信息， 并对所述载波进 行侦听以接收来自所述组播组中其他用户设备的信息；  III. After the fixed time window arrives, stop transmitting information, and listen to the carrier to receive information from other user equipments in the multicast group;
IV. 当停止传输信息达到预定时间长度后， 如果仍有信息需要传 输， 则继续执行上述步骤 I至 III。  IV. After stopping the transmission of the information for a predetermined length of time, if there is still information to be transmitted, continue with steps I to III above.
PCT/CN2013/081008 2013-08-07 2013-08-07 Method for implementing device to device (d2d)-based multicast communication in cellular network WO2015018010A1 (en)

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