WO2014124608A1 - Procédé de découverte de dispositif de communication de dispositif à dispositif, équipement utilisateur et dispositif côté réseau - Google Patents

Procédé de découverte de dispositif de communication de dispositif à dispositif, équipement utilisateur et dispositif côté réseau Download PDF

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Publication number
WO2014124608A1
WO2014124608A1 PCT/CN2014/072162 CN2014072162W WO2014124608A1 WO 2014124608 A1 WO2014124608 A1 WO 2014124608A1 CN 2014072162 W CN2014072162 W CN 2014072162W WO 2014124608 A1 WO2014124608 A1 WO 2014124608A1
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Prior art keywords
device discovery
user equipment
parameter
discovery signal
resource
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PCT/CN2014/072162
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English (en)
Chinese (zh)
Inventor
吴栓栓
梁枫
戴博
张峻峰
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中兴通讯股份有限公司
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Publication of WO2014124608A1 publication Critical patent/WO2014124608A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

Definitions

  • Device discovery method for device-to-device communication user equipment, and network side equipment
  • the present invention relates to the field of wireless communications, and in particular, to a device discovery method for device-to-device communication in a cellular wireless communication system, a user equipment, and a network side device.
  • a cellular communication system when there is a service transmission between two user equipments (User Equipments, UEs for short), the service data of UE1 to UE2 is first transmitted to the base station of the cell where the UE1 is located through the air interface (Base Station, or The evolved Node B (eNB) transmits the user data to the base station of the cell where the UE2 is located through the core network, and the base station transmits the service data to the UE2 through the air interface.
  • eNB evolved Node B
  • a similar processing flow is used for the service data transmission from UE2 to UE1.
  • D2D Device-to-Device
  • the so-called D2D means that the service data is not forwarded by the base station and the core network, and is directly transmitted by the source UE to the target UE through the air interface.
  • This communication mode is different from the communication mode of a conventional cellular system. For users of short-range communication, D2D not only saves wireless spectrum resources, but also reduces the data transmission pressure of the core network.
  • the UE In cellular communication, when two UEs communicate, in general, the UE does not need to know the location of the counterpart UE itself, but establishes a connection between two UEs through a network side device (for example, a base station or a core network device).
  • a network side device for example, a base station or a core network device.
  • the premise of establishing a communication connection is mutual discovery between UEs, which can also be called device-to-device discovery or device discovery.
  • device-to-device communication applied to cellular communication systems, since spectrum resources need to be shared with cellular communication, interference problems with cellular communication during device discovery need to be carefully studied to avoid interference between device discovery and cellular communication, and to ensure The efficiency of device discovery. Summary of the invention
  • the embodiments of the present invention provide a device discovery method for device-to-device communication, a user equipment, and a network side device, so as to improve device-to-device communication reliability.
  • An embodiment of the present invention provides a device discovery method for device-to-device communication, including: receiving, by a user equipment, device discovery first configuration signaling sent by a network side device;
  • the first configuration signaling is sent in the form of a broadcast, and includes one or more of the following parameters: a time domain radio resource configuration parameter used to indicate a device discovery frame and/or a subframe;
  • a frequency domain radio resource configuration parameter used to indicate that the device discovers a frequency band location
  • a sequence configuration parameter used to indicate a device discovery signal sequence is
  • the time domain radio resource configuration parameter includes:
  • the frequency domain radio resource configuration parameter is represented by one of the following manners:
  • LTE Long Term Evolution
  • the determining, by the user equipment, the device discovery resource used for the device discovery signal transmission according to the first configuration signaling includes:
  • the user equipment determines a transmission time slot of the discovery signal in the device discovery resource according to a preset rule, and sends a device discovery signal in the sending time slot, where the preset rule includes:
  • the user equipment randomly selects a time slot sending device discovery signal in the time domain resource; or, the user equipment determines a time slot in the time domain resource period, and sends a device discovery signal in the time slot, Wherein the determining manner is a random selection; or
  • the user equipment determines a transmission period of the discovery signal, and sends a device discovery signal according to the sending period, where the sending period is an integer multiple of a time domain common resource period; or
  • the user equipment calculates a transmission time slot of the discovery signal according to the user equipment identifier and according to an agreed formula, and sends a device discovery signal in the transmission time slot.
  • the frequency domain resource that is sent by the user equipment to the device discovery signal is a frequency band indicated by a frequency domain radio resource configuration parameter in the first configuration signaling.
  • the user equipment discovers the resource by using the device, and the device includes:
  • the user equipment detects a device discovery signal in the device discovery resource, and discovers the target user equipment by using the detection.
  • the foregoing method further includes:
  • the user equipment receives the device discovery second configuration signaling sent by the network side device, and determines, according to the first configuration signaling and the second configuration signaling, a user equipment dedicated resource used for device discovery signal transmission, Transmitting a device discovery signal in the dedicated resource;
  • the second configuration signaling includes one or more of the following parameters:
  • time domain radio resource configuration parameter for indicating a device discovery frame and/or a subframe dedicated to the user equipment
  • a frequency domain radio resource configuration parameter for indicating a device discovery band position dedicated to the user equipment; a sequence configuration parameter for indicating a device discovery signal sequence specific to the user equipment; A power control parameter for indicating a device discovery signal transmission power dedicated to the user equipment.
  • the time domain radio resource configuration parameter in the second configuration signaling includes one or more of the following parameters:
  • a parameter for indicating a device-specific device discovery subframe period and a subframe offset is a parameter for indicating a device-specific device discovery subframe period and a subframe offset.
  • the second configuration signaling is high layer signaling, and is carried by a dedicated Radio Resource Control (RRC) signaling; or
  • RRC Radio Resource Control
  • the second configuration signaling is physical layer signaling, and is carried by downlink control information or a physical downlink shared channel.
  • the foregoing method further includes:
  • the device discovery second configuration signaling sent by the network side device determining, according to the first configuration signaling and the second configuration signaling, a sending time slot or a detecting time slot of the device discovery signal, where Transmitting the device discovery signal in the sending time slot or detecting the device discovery signal in the detecting time slot;
  • the second configuration signaling is used to trigger the user equipment to send or detect a device discovery signal, including one or more of the following parameters:
  • a device discovery signal index parameter for indicating a device discovery signal sequence
  • the second configuration signaling is physical layer signaling, and is carried by downlink control information or a physical downlink shared channel.
  • the radio resource is in a Frequency Division Duplexing (FDD) system Allocated in the upstream band; or,
  • FDD Frequency Division Duplexing
  • the radio resource is allocated in an uplink subframe of a Time Division Duplexing (TDD) system
  • the radio resources are configured in a dedicated frequency band, which refers to a frequency band dedicated to device-to-device communication.
  • the embodiment of the present invention further provides a device-to-device communication device discovery method, including: the network side device sends a device discovery first configuration signaling to the user equipment, where the first configuration signaling configuration is used for the device discovery signal. The discovered device discovers the resource;
  • the user equipment discovers resources through the device to perform device discovery
  • the first configuration signaling includes one or more of the following parameters:
  • time domain radio resource configuration parameter for indicating a device discovery frame and/or a subframe
  • a frequency domain radio resource configuration parameter used to indicate that the device discovers a frequency band location
  • a sequence configuration parameter used to indicate a device discovery signal sequence is
  • the foregoing method further includes:
  • the network side device sends, to the user equipment, second configuration signaling for determining user equipment specific resources used for device discovery signal transmission;
  • the second configuration signaling includes one or more of the following parameters:
  • time domain radio resource configuration parameter for indicating a device discovery frame and/or a subframe dedicated to the user equipment
  • the foregoing method further includes:
  • the network side device sends, to the user equipment, second configuration signaling for triggering the user equipment to send or detect a device discovery signal;
  • the second configuration signaling includes one or more of the following parameters: a trigger indication parameter used to indicate that the user equipment performs a device discovery signal transmission or detection; a parameter used to indicate that the device discovers a signal transmission period;
  • An indication parameter for indicating a number of times or duration of the device discovery signal sent by the user equipment a device discovery signal index parameter for indicating a device discovery signal sequence
  • the embodiment of the invention further provides a user equipment, including:
  • the first communication module is configured to: receive the device discovery first configuration signal sent by the network side device, where the first configuration signaling includes one or more of the following parameters:
  • time domain radio resource configuration parameter for indicating a device discovery frame and/or a subframe
  • a frequency domain radio resource configuration parameter used to indicate that the device discovers a frequency band location
  • a resource determining module configured to: determine, according to the first configuration signaling, a device discovery resource for device discovery signal transmission;
  • a second communication module configured to: discover, by the device, a resource sending device discovery signal or a detecting device discovery signal, and perform device-to-device communication device discovery according to the device discovery signal.
  • the resource determining module is configured to determine a device discovery resource for device discovery signal transmission according to the first configuration signaling in the following manner:
  • Determining a transmission period of the discovery signal and determining, in the transmission period, a time slot for transmitting a device discovery signal, wherein the transmission period is an integer multiple of a time domain common resource period; or
  • the transmission time slot of the discovery signal is calculated according to the user equipment identity and according to the agreed formula.
  • the frequency domain resource that sends the device discovery signal is a frequency band indicated by a frequency domain radio resource configuration parameter in the first configuration signaling.
  • the second communication module is configured to perform device-to-device communication according to the device discovery signal in the following manner: detecting a device discovery signal in the device discovery resource, and discovering the target user device by using the detection.
  • the first communication module is further configured to: receive the device discovery second configuration signaling sent by the network side device, where the second configuration signaling includes one or more of the following parameters:
  • time domain radio resource configuration parameter for indicating a device discovery frame and/or a subframe dedicated to the user equipment
  • the resource determining module is further configured to: determine user equipment dedicated resources for device discovery signal transmission according to the first configuration signaling and the second configuration signaling;
  • the second communication module is further configured to: send a device discovery signal in the dedicated resource.
  • a device discovery signal in the dedicated resource.
  • the first communication module is further configured to: receive, by the network side device, a device for triggering a user equipment to send or detect a device discovery signal to discover second configuration signaling, where the second configuration signaling includes the following Kind or several parameters:
  • a triggering parameter for instructing the user equipment to perform device discovery signal transmission or detection a parameter for indicating that the device discovers a signal transmission period
  • a device discovery signal index parameter for indicating a device discovery signal sequence
  • the resource determining module is further configured to: determine, according to the first configuration signaling and the second configuration signaling, a sending time slot or a detecting time slot of the device discovery signal;
  • the second communication module is further configured to: send the device discovery signal in the transmission time slot or detect the device discovery signal in the detection time slot.
  • the embodiment of the invention further provides a network side device, including:
  • a resource configuration module configured to: configure a device discovery resource and generate a device discovery first configuration signaling, where the first configuration signaling includes one or more of the following parameters: used to indicate that the device discovers a frame and/or a sub Time domain radio resource configuration parameters of the frame;
  • a frequency domain radio resource configuration parameter used to indicate that the device discovers a frequency band location
  • the time domain radio resource configuration parameter includes: a parameter indicating a device to discover a time domain resource period, a radio frame offset, and a subframe position, where the user equipment determines according to the parameter. Time domain resources for device discovery; or,
  • the frequency domain radio resource configuration parameter is represented by one of the following manners:
  • a parameter used to indicate the start of a frequency domain resource is a parameter used to indicate the start of a frequency domain resource.
  • the resource configuration module is further configured to: after the communication module sends the first configuration signaling, configure a user equipment dedicated resource for device discovery signal transmission and generate second configuration signaling; and the communication module further The method is configured to: send the second configuration signaling to the user equipment, where the second configuration signaling includes one or more of the following parameters:
  • time domain radio resource configuration parameter for indicating a device discovery frame and/or a subframe dedicated to the user equipment
  • a frequency domain radio resource configuration parameter for indicating a device discovery band position dedicated to the user equipment; a sequence configuration parameter for indicating a device discovery signal sequence specific to the user equipment;
  • the time domain radio resource configuration parameter in the second configuration signaling includes one or more of the following parameters:
  • a parameter for indicating a device-specific device discovery subframe period and a subframe offset is a parameter for indicating a device-specific device discovery subframe period and a subframe offset.
  • the second configuration signaling is high layer signaling, and the RRC signaling bearer is controlled by a dedicated radio resource; or
  • the second configuration signaling is physical layer signaling, and is carried by downlink control information or a physical downlink shared channel.
  • the resource configuration module is further configured to: after the sending, by the communications module, the first configuration signaling, generate second configuration signaling, configured to trigger the user equipment to send or detect a device discovery signal, where
  • the second configuration signaling includes one or more of the following parameters: a trigger indication parameter used to indicate that the user equipment performs a device discovery signal transmission or detection, and a parameter used to indicate that the device discovers a signal transmission period;
  • the second configuration signaling is physical layer signaling, and is carried by downlink control information or a physical downlink shared channel.
  • the radio resource is allocated in an uplink frequency band of the frequency division duplex FDD system; or the radio resource is allocated in an uplink subframe of the time division duplex TDD system; or the radio resource is configured in a dedicated frequency band,
  • a dedicated frequency band refers to a frequency band dedicated to device-to-device communication.
  • the problem of device discovery of device-to-device communication in a cellular communication system is solved, which not only avoids interference between device discovery and cellular communication of device-to-device communication, but also ensures device discovery efficiency and helps Improve the breadth of device-to-device communication applications.
  • 1 is a schematic structural diagram of a radio frame of an LTE/LTE-A system
  • FIG. 2 is a schematic structural diagram of physical resources of an LTE/LTE-A system
  • FIG. 3 is a schematic diagram of network deployment of a cellular wireless communication system
  • FIG. 5 is a schematic structural diagram of another radio frame proposed in Embodiment 1;
  • FIG. 6 is a schematic structural diagram of a third radio frame proposed in Embodiment 1;
  • FIG. 7 is a schematic structural diagram of a radio frame in an implementation manner of Embodiment 4.
  • FIG. 8 is a schematic structural diagram of a radio frame in another implementation manner of Embodiment 4.
  • FIG. 9 is a schematic structural diagram of a user equipment provided in Embodiment 6;
  • 10 is a schematic structural diagram of a network side device provided in Embodiment 7; 11 is a schematic structural diagram of a network side device provided in Embodiment 8. Preferred embodiment of the invention
  • Common cellular wireless communication systems can be based on CDMA (Code Division Multiplexing Access) technology, FDMA (Frequency Division Multiplexing Access) technology, OFDMA (Orthogonal-FDMA, Orthogonal Frequency Division Multiple Access) technology.
  • SC-FDMA Single Carrier-FDMA, Single Carrier Frequency Division Multiple Access
  • 3 GPP 3rd Generation Partnership Project
  • LTE/LTE-A LTE-Advanced, Advanced Long Term Evolution
  • wireless communication resources are in the form of time-frequency two-dimensional.
  • uplink and downlink communication resources are divided in units of radio frames in the time direction, and each radio frame has a length of 10 milliseconds ( Ms), containing 10 sub-frames of length 1 ms, each sub-frame consisting of two slots of length 0.5 ms, as shown in Figure 1.
  • Ms milliseconds
  • each time slot can include 6 or 7 OFDM (Orthogonal Frequency Division Multiplexing) or SC-FDM (Single Carrier-FDM). , single carrier frequency division multiplexing) symbols.
  • resources are divided into subcarriers.
  • the smallest unit of frequency domain resource allocation is RB (Resource Block), and one PRB (Physical RB, physical resource block corresponding to physical resources) ).
  • a PRB contains 12 sub-carriers in the frequency domain, corresponding to one slot in the time domain.
  • a resource corresponding to one subcarrier on each OFDM/SC-FDM symbol is referred to as a resource element (Resource Element, RE). as shown in picture 2.
  • RE resource element
  • the UE discovers an LTE network by detecting a synchronization signal (Synchronization Signal, SS).
  • SS Synchronization Signal
  • the SS includes a primary synchronization signal (Primary SS, PSS) and a secondary synchronization signal (Secondary SS, SSS).
  • Primary SS Primary synchronization signal
  • SSS secondary synchronization signal
  • the UE On the uplink, when the UE has uplink data transmission, it needs to initiate random access (RA) for uplink synchronization and establish an RRC (Radio Resource Control, RRC) connection, that is, enter the RRC from the RRC idle (Idle) state. Connected state.
  • RRC Radio Resource Control
  • the UE needs to send a random access preamble (preamble) during random access.
  • the network side device detects the random access preamble in a specific time-frequency resource to implement the identification of the UE and the synchronization of the uplink.
  • Figure 3 shows a schematic diagram of a network deployment of a cellular wireless communication system.
  • the network deployment shown in the figure may be a 3GPP LTE/LTE-A system, or other cellular wireless communication technology.
  • a network side device In an access network of a cellular radio communication system, a network side device generally includes a certain number of base stations (also referred to as a Node B), or an eNB, or an enhanced Node B (eNB). , and other network entities. Or, in summary, they may also be collectively referred to as an Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network).
  • Evolved Universal Terrestrial Radio Access Network Evolved Universal Terrestrial Radio Access Network
  • the base station referred to herein also includes a Low Power Node (LPN) in the network, for example, a pico, relay, femto or home base station (Home eNB, HeNB).
  • LPN Low Power Node
  • the base station provides a certain wireless signal coverage, and the terminal (terminal, or user equipment, UE or device device) in the coverage area can perform wireless communication with the base station.
  • the radio signal coverage area of a base station may be divided into one or more cells (sectors) or sectors based on certain criteria. For example, there may be three cells, and each cell may have independent wireless communication.
  • the subsystems are processed, for example, as separate RF units.
  • the device discovery process may require the assistance of the network-side device, and the device discovery is managed through the assistance of the network to avoid device discovery.
  • Cellular communication creates interference and improves the efficiency of device discovery through network assistance.
  • Network entities that manage wireless resources are generally The base station, for example, may allocate radio resources for device discovery by the base station, and the UE that performs device-to-device communication discovers or detects the device discovery signal in the radio resource. Alternatively, the foregoing radio resource allocation may also be performed by the base station according to an indication of an upper layer network entity.
  • Device discovery methods based on the above considerations include:
  • the user equipment receives the device discovery first configuration signaling sent by the network side device; the user equipment determines, according to the first configuration signaling, a device discovery resource used for device discovery signal transmission, and discovers the resource through the device to perform device discovery.
  • the first configuration signaling is sent in the form of a broadcast, and includes one or more of the following parameters: a time domain radio resource configuration parameter used to indicate a device discovery frame and/or a subframe; and is used to indicate that the device discovers a frequency band location.
  • the frequency domain radio resource configuration parameter is used to indicate a sequence configuration parameter of the device discovery signal sequence.
  • the first configuration signaling may include a time domain radio resource configuration parameter for indicating a device discovery frame and/or a subframe, by which the device discovers the configuration of the time domain resource.
  • a radio frame for device discovery can be allocated by time domain resource period, radio frame offset.
  • SFN system frame number
  • the allocation period can be configurable, such as 1, 2, 4, 8, 16, 32, 64, etc.
  • the allocation offset can be configurable, such as 0/1/2/3/4/ 5/6/7, etc.; or, the allocation period can be agreed, such as 16, or 32
  • the allocation offset can be configurable, such as 0-16, or 0-32, and so on.
  • the numbers herein are examples and are not intended to limit the embodiments of the present invention. The above numerical values may take any integer value within the range of the system frame number.
  • the device can discover the radio frame by using the foregoing periodic and offset configurable device, and the device discovery subframe can be reconfigured in the radio frame.
  • the subframe configured in the radio frame to be the device discovery resource can be represented by a bitmap, for example, A bitmap that can be m bits represents a device discovery subframe configured in a radio frame, and m is a maximum number of subframes in a radio frame that can be configured as a device discovery subframe, such as 5 or 6 or 10; or A device discovery subframe may be configured by using multiple radio frames as a basic unit, for example, 2 or 4 or 8 or 16 or 32 radio frames as a basic time unit.
  • the size of the bitmap is 2m, 4m, 8m, 16m and 32m, respectively, and m has the same meaning as before. It should also be noted that 2/4/8/16/32 is an example and does not constitute a limitation.
  • the device can discover the configuration of time domain common resources.
  • the radio frame is found; the bitmap is 0000001000, indicating that the device finds that the subframe with the number 6 in the radio frame is configured as the device discovery subframe.
  • the time domain resource period is the same as the offset, but the bitmap is 100000, indicating that the device finds that the subframe within the radio frame number 1 that can be configured as the device discovery subframe is configured as the device discovery subframe.
  • a subframe that can be configured as a device discovery subframe is an uplink subframe
  • a maximum set of uplink subframe numbers in a TDD system is 2/3/4/7/8/9 (subframe number 0) -9)
  • the above bitmap indicates that the subframe numbered 2 is configured as a device discovery subframe.
  • the time domain resource is configured by indicating a period and a subframe offset.
  • a device discovery resource allocation period may be defined, where the allocation period may be used to indicate a repetition interval or time of the device discovery resource.
  • the allocation period may be in units of radio frames, and may be configured as 1, 2, 4, 8, 16, 32, etc., respectively, indicate that the device has discovered one or two or four resources... The radio frame is repeated once.
  • subframes for example, may be configured as 5, 10, 20, 40 , 80, 160, and so on, respectively, indicate that the device discovery resource has a repetition period of 5, 10, 20, 40, 80, and 160 subframes.
  • the subframe offset (Offset) parameter included in the time domain resource configuration is used to indicate the subframe position within the time domain resource allocation period.
  • the subframe offset can be configured as 0/1/2/3/4/..., indicating that the 1/2/3/4/5/... subframes are configured in the time domain resource allocation period, respectively. Discover resources for your device. It should be noted that the numbers herein are examples and are not intended to limit the embodiments of the present invention.
  • a device discovery resource period is configured in units of subframes, and an example of determining a subframe position by a subframe offset is shown in FIG. 5.
  • Subframe the period of the device discovery resource configured by the first configuration signaling is 320 milliseconds, that is, 320 subframes; and the subframe offset Offset is 83, based on which it is determined that the device discovers the subframe as shown in FIG. 5
  • the color sub-frame is shown.
  • the time domain resource can be configured by indicating the period and the subframe position.
  • the description of the cycle is the same as the foregoing and will not be described again.
  • the subframe position parameter included in the time domain resource configuration is used to indicate the subframe allocated in the time domain resource allocation period.
  • the subframe position can be configured in a bitmap manner, and whether the bitmap is set to 1 indicates whether the subframe corresponding to the bit is configured as a device discovery subframe.
  • the time domain resource is determined by indicating the combination of subframes.
  • a subframe belonging to a Hybrid Autonomous Repeat Request (HARQ) process may be agreed as a combination, so that there are 8 combinations in total, and an 8-bit bitmap is used to represent the corresponding combination.
  • the subframe is configured as a device discovery subframe.
  • the subframe is configured as the device discovery subframe (SN range 0-9), the second in the bitmap.
  • the first configuration signaling may further include a frequency domain radio resource configuration parameter for indicating that the device discovers a frequency band location, where the frequency domain radio resource configuration parameter is used by the distribution device to discover the frequency domain resource.
  • the frequency domain resources may be allocated by using a frequency domain resource block allocation manner in the LTE system (that is, the frequency domain radio configuration parameter in the first configuration signaling is a resource allocation parameter based on a frequency domain resource block allocation manner defined by the LTE system) .
  • the frequency domain resource allocation may be performed by resource allocation type 0 (Resource Allocation type 0, RA type 0 ), resource allocation type 1 (RA type 1 ), or resource allocation type 2 ( RA type 2 ), and will not be described again.
  • the frequency domain resources may be allocated by means of a bitmap (ie, the frequency domain radio configuration parameter in the first configuration signaling is a predefined frequency domain resource configuration index).
  • the length of the bitmap is n/k rounded down (ie, L «/ ”) bits, where n is the system bandwidth of the carrier where the frequency domain resource is located or The maximum bandwidth of a carrier supported by the system, in units of resource blocks.
  • Whether the bit in the bitmap is set to 1 indicates whether the frequency band represented by the bit is configured as a device discovery resource.
  • the length of the bitmap may be n, and each bit indicates whether the resource block corresponding to the bit is configured as a device discovery resource.
  • the frequency domain resource is allocated by using the frequency offset parameter, that is, the frequency domain radio configuration parameter in the first configuration signaling is a parameter indicating a start of the frequency domain resource, and the user starts the parameter according to the frequency domain resource.
  • the frequency domain resources used for device discovery can be determined by combining the frequency bandwidth of the frequency domain agreed in advance. For example, if the device discovery signal occupies k resource blocks in the frequency domain, the value of the frequency offset parameter is rounded down to 0 to n/k, and the meaning of n is the same as the foregoing. Take 0 to indicate that the resource block number starts from 0, and the k resource blocks are configured as device discovery resources. Take 1 to indicate that the resource block number starts from k+1.
  • the k resource blocks are configured as device discovery resources, and 2 indicates resource block number.
  • the k resource blocks starting from 2*k+l are configured as device discovery resources, and so on.
  • the value of the frequency offset parameter is 0 to nk, and 0 means that the k resource blocks whose resource block number starts from 0 are configured as device discovery resources, and 1 represents k resource blocks whose resource block number starts from 1.
  • Configured as a device discovery resource take 2 resource blocks whose resource block number starts from 2 are configured as device discovery resources, and so on.
  • the network side device allocates the device to discover the common resource according to the foregoing configuration manner, and generates the first configuration signaling according to the configuration, and sends the first configuration signaling to the user equipment.
  • the first configuration signaling can be sent in the form of a broadcast.
  • the first configuration signaling may be sent through System Information (SI) and carried in a System Information Block (SI Block, SIB).
  • SIB can be an SIB of an existing system or a newly added SIB in the system, for example, a new SIB dedicated to D2D communication.
  • the user equipment supporting the D2D device discovery or having the D2D device discovery requirement receives the first configuration signaling sent by the above broadcast.
  • the user equipment When the user equipment has a need to send a device discovery signal, the user equipment according to the received The broadcast signaling obtains a set of time domain resources discovered by the device, and determines a time domain resource of the device discovery signal, such as a subframe, in the resource set according to a preset rule.
  • the preset rule may be a method of randomly selecting a resource in the time domain. For example, the UE randomly selects the time domain resource in the time domain resource set in one cycle of the device discovery resource, for example, selecting one subframe to perform the device discovery signal transmission, that is, the UE performs the device in the cycle of the device discovery resource period. Discover the transmission of the signal. Or, the UE determines a sending period of the device discovery signal, where the period is a multiple of the device discovery resource period, and the UE randomly selects the time domain resource in the time domain resource set during the device discovery signal sending period, for example, selecting one subframe to perform the device. The transmission of the discovery signal, that is, the UE transmits the device discovery signal with a specific multiple of the device discovery resource period.
  • the preset rule may be that the UE calculates the available time domain discovery resources according to the user equipment identifier (UE_Identifier, UE_ID). For example, it is assumed that the period in which the UE sends the discovery signal is the same as the period in which the device discovers the time domain resource, that is, the discovery signal is sent once in each time domain resource period, and the UE calculates the time domain resource location of the discovery signal according to the UE-ID. H does not allocate a time domain resource or subframe for discovery signal transmission in a time domain resource period, and then UE_ID mod N can determine the time domain subframe position of the UE transmitting device discovery signal.
  • UE_Identifier UE_Identifier
  • the period in which the UE sends the discovery signal may be a multiple of the time domain resource period of the device discovery.
  • the multiple is represented by i, and i may take an integer greater than or equal to 1.
  • the UE may be determined by using UE_ID mod (i*N).
  • the device identifier can also be other identifiers, and will not be described again.
  • the allocated device discovery resource set is indicated to the user equipment by using the first configuration signaling, and the user equipment is triggered or authorized to perform the device discovery signal transmission by using the second configuration signaling.
  • the device discovery process of device-to-device communication is described as follows: The user equipment receives the first configuration signaling sent by the network side device by using the broadcast message, and the user equipment determines, according to the device, the time domain resource set, wherein the description and the sending manner of the first configuration signaling may refer to Embodiment 1; When the user equipment is authorized to send the device discovery signal, the network side device sends the second configuration signaling to the user equipment, and triggers or authorizes the user equipment to send the device discovery signal by using the second configuration signaling.
  • the first configuration signaling may be used to configure a device to discover a common parameter, for example, configuring a device to discover a time domain common resource set and a frequency domain resource set; and the second configuration signaling may be used to configure a device discovery specific parameter.
  • a device that can configure a user device discovers time domain-specific resources. When the domain resource, such as a subframe, satisfies the subframe in the device discovery time domain resource set configured by the first configuration signaling, and the user equipment dedicated device discovery subframe configured by the second configuration signaling, the user equipment is in the subframe. The device sends a discovery signal.
  • the device configured by the first configuration signaling device discovers that the time domain resource set is a subframe represented by blue, and the user equipment dedicated device configured by the second configuration signaling is a subframe represented by red, and the two are coincident. That is, the subframe represented by red is the subframe in which the user equipment sends the device discovery signal.
  • the second configuration signaling may be configured by configuring a radio frame period and a radio frame offset to configure a time domain radio frame position of the UE-specific device discovery resource, and setting a device discovery sub-frame position in the radio frame by using a bitmap.
  • the second configuration signaling indicates that the radio frame period is 2, the radio frame offset is 1, and the bitmap is 0001000000.
  • the second configuration signaling may configure the UE dedicated device to discover the subframe by configuring the subframe period and the subframe offset.
  • the second configuration signaling indicates that the subframe period is 20 and the subframe offset is 13.
  • the second configuration signaling may configure the UE-specific device discovery subframe by configuring a transmission period and a subframe offset of the device discovery signal.
  • the configured device discovers that the period of the time domain common resource is represented by the radio frame as the Pr, and the transmission period Pt configured by the second configuration signaling may take an integer greater than or equal to 1, indicating that the user equipment sends the device discovery signal for the period.
  • the radio frame is denoted as Pt*Pr; the subframe offset is used to indicate the location of the dedicated device discovery subframe configured for the user equipment during the transmission period. For example, in the example shown in FIG.
  • the second configuration signaling is that the device discovery signal transmission period configured for the user equipment is 2 radio frames, and the subframe offset is 1, indicating that Transmission week During the period, the second device discovery subframe is configured as a device discovery dedicated subframe of the user equipment.
  • each parameter configured by the foregoing second configuration signaling may be represented by using independent parameters in the second configuration signaling, or may be jointly coded by each parameter, and represented by independent parameters obtained by joint coding. .
  • the second configuration signaling described in this example may be high layer signaling, for example, sent to the user through RRC signaling.
  • the second configuration signaling may also be physical layer signaling, for example, transmitted by a Physical Downlink Shared Channel (PDSCH) indicated by a Physical Downlink Control Channel (PDCCH); or sent by using a PDCCH.
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • the second configuration signaling may be set in the existing Downlink Control Information (DCI) or the DCI used for D2D communication scheduling, or the DCI format in the system may be reused for the second configuration signaling.
  • the DCI format 0 or the format 1A or the format 3 or other existing formats are redefined, and the bearer of the second configuration signaling is performed by using the DCI format.
  • the user equipment After receiving the first configuration signaling and the second configuration signaling, the user equipment determines, according to the first configuration signaling and the second configuration signaling, a device discovery subframe, and sends or detects
  • the second configuration signaling may also be used to trigger the user equipment to transmit the device discovery signal.
  • the device discovery time domain resource set of the first configuration signaling configuration is as shown in the blue subframe in the figure, and the second configuration signaling is in the subframe 9 of the radio frame 4n+1 (subframe number 0 ⁇ ) 9) Send.
  • the number of times the sending device discovers the signal may be sent only once, or multiple times.
  • the multiple times of the transmission may be determined by the agreed form. For example, after the user equipment receives the second configuration signaling, the user equipment continuously transmits the information in the available device discovery subframes that meet the interval requirement, i is an integer greater than or equal to 1.
  • the number of times of transmission may also be configured.
  • the second configuration signaling includes a parameter for indicating the number of consecutive transmissions of the device discovery signal, and the user equipment determines the number of consecutive transmissions of the device discovery signal according to the indication of the parameter.
  • the second configuration signaling indicates a period in which the user equipment sends the device discovery signal.
  • the period can be represented by a multiple of the time domain resource period of the device discovery. For example, it can be configured as 1/2/3/4..., indicating that the period during which the user equipment sends the device discovery signal is 1/2 of the time domain resource period. 3/4... times.
  • the device discovers that the time domain resource period is 20ms, then when configured as 1/2/3/4..., the period of the sending device discovery signal is 20/40/60/80... ms.
  • the second configuration signaling may also include a power control parameter for indicating a device discovery signal transmission power dedicated to the user equipment, and the user equipment sets the transmission power of the device discovery signal according to the parameter.
  • This embodiment provides a device-to-device communication device discovery method, which mainly includes the following operations:
  • the network side device sends a device discovery first configuration signaling to the user equipment, where the first configuration signaling configuration is used for device discovery signal transmission.
  • Device discovery resource user device discovers resources through device discovery;
  • the first configuration signaling includes one or more of the following parameters:
  • time domain radio resource configuration parameter for indicating a device discovery frame and/or a subframe
  • a frequency domain radio resource configuration parameter used to indicate that the device discovers a frequency band location
  • a sequence configuration parameter used to indicate a device discovery signal sequence is
  • the network side device may further send, to the user equipment, second configuration signaling for determining a user equipment dedicated resource used for device discovery signal transmission, where the second configuration signaling is performed. Includes one or more of the following parameters:
  • time domain radio resource configuration parameter for indicating a device discovery frame and/or a subframe dedicated to the user equipment
  • a frequency domain radio resource configuration parameter for indicating a device discovery band position dedicated to the user equipment; a sequence configuration parameter for indicating a device discovery signal sequence specific to the user equipment;
  • the network side device may send, to the user equipment, a second configuration signaling that is used to trigger the user equipment to send or detect a device discovery signal, where the second configuration signaling includes One or more of the following parameters:
  • a trigger indication parameter for instructing the user equipment to perform device discovery signal transmission or detection; an indication parameter for indicating the number of times or duration of the device discovery signal sent by the user equipment; and a device discovery signal index parameter for indicating the device discovery signal sequence;
  • the second configuration signaling involved in the foregoing two schemes may be high layer signaling, and is carried by dedicated RRC signaling. It can also be physical layer signaling, which is carried by downlink control information or physical downlink shared channel.
  • the time domain radio resource configuration parameter in the second configuration signaling includes one or more of the following parameters: a parameter for indicating a device discovery resource period, a radio frame offset, and a subframe position dedicated to the user equipment;
  • a parameter for indicating a device-specific device discovery subframe period and a subframe offset is a parameter for indicating a device-specific device discovery subframe period and a subframe offset.
  • the present embodiment provides a user equipment, which can implement the device discovery method of the foregoing embodiments 1 and 2.
  • the structure is as shown in FIG. 9, and includes a first communication module 91, a resource determination module 92, and a second communication module 93.
  • the first communication module 91 is configured to: communicate with the network side device, and receive the device discovery first configuration signaling sent by the network side device, where the first configuration signaling includes one or more of the following parameters: Time domain radio resource configuration parameters of frames and/or subframes;
  • a frequency domain radio resource configuration parameter used to indicate that the device discovers a frequency band location
  • a sequence configuration parameter used to indicate a device discovery signal sequence is
  • the resource determining module 92 is configured to: determine, according to the first configuration signaling, a device discovery resource used for device discovery signal transmission;
  • the resource determining module 92 is configured to determine a device discovery resource for device discovery signal transmission according to the first configuration signaling in the following manner:
  • Determining a transmission period of the discovery signal and determining, in the transmission period, a time slot for transmitting the device discovery signal, where the transmission period is an integer multiple of the time domain common resource period;
  • the transmission time slot of the discovery signal is calculated according to the user equipment identity and according to the agreed formula.
  • the second communication module 93 is configured to: use a device discovery resource to send a device discovery signal or a detection device discovery signal, and perform device-to-device communication device discovery according to the device discovery signal.
  • the second communication module 93 is a device discovery for performing device-to-device communication based on the device discovery signal in the following manner: A device discovery signal is detected in the device discovery resource, and the target user device is found by the detection.
  • the first communication module 91 in the user equipment may be further configured to: receive, by the network side device, the device discovery second configuration signaling, where the second configuration signaling includes one or more of the following parameters:
  • Time domain radio resource configuration parameters for indicating device discovery frames and/or subframes dedicated to user equipment Number
  • the resource determining module 92 is further configured to: determine user equipment dedicated resources for device discovery signal transmission according to the first configuration signaling and the second configuration signaling;
  • the second communication module 93 is further configured to: send the device discovery signal in the determined dedicated resource.
  • the first communication module 91 in the user equipment may be further configured to: receive, by the network side device, a second configuration signaling that is used by the device that triggers the user equipment to send or detect the device discovery signal, where The second configuration signaling includes one or more of the following parameters:
  • a trigger parameter for instructing the user equipment to perform device discovery signal transmission or detection
  • an indication parameter for indicating the number of times the device finds the signal transmission time or duration
  • a device discovery signal index parameter for indicating a device discovery signal sequence
  • the resource determining module 92 is further configured to: determine, according to the first configuration signaling and the second configuration signaling, a sending time slot or a detecting time slot of the device discovery signal;
  • the second communication module 93 is further configured to: send the device discovery signal in the determined transmission time slot or detect the device discovery signal in a detection time slot.
  • the present embodiment provides a network side device, which can implement the device discovery method of the foregoing embodiments 1 to 3.
  • the structure of the device is as shown in FIG. 10, and includes a resource configuration module 101 and a communication module 102.
  • the resource configuration module 101 is configured to: configure a device to discover resources and generate configuration signaling.
  • the configuration signaling includes the first configuration signaling.
  • the communication module 102 is configured to: broadcast the first configuration signaling configured by the resource configuration module 101 to the user equipment;
  • the solution configuration module 101 is further configured to: after the communication module 102 sends the first configuration signaling, configure the second configuration signaling, where the second configuration signaling is used in the first configuration.
  • the user equipment-specific device discovery resource is allocated in the signaling configuration resource or is used to trigger the user equipment to send or detect the device discovery signal.
  • the communication module 102 is further configured to: send the first configuration signaling and the second configuration signaling configured by the resource configuration module 101 to the user equipment.
  • the second configuration signaling refer to the corresponding content of the foregoing embodiments 1 to 3, and details are not described herein again.
  • This embodiment provides a network side device, and its structure is as shown in FIG. 11, and includes a resource configuration module 111, a trigger module 112, and a communication module 113.
  • the resource configuration module 111 is configured to: configure a device discovery resource and generate first configuration signaling. No longer.
  • the triggering module 112 is configured to: trigger the user equipment to send or detect a device discovery signal and generate second configuration signaling.
  • the communication module 113 is configured to: send the first configuration signaling configured by the resource configuration module 111 to the user equipment; and send the second configuration signaling generated by the triggering module 112 to the user equipment.
  • the second configuration signaling includes one or more of the following parameters:
  • a trigger indication parameter for instructing the user equipment to perform device discovery signal transmission or detection; an indication parameter for indicating the number of times or duration of the device discovery signal sent by the user equipment; and a device discovery signal index parameter for indicating the device discovery signal sequence;
  • the communication module 113 sends the second configuration signaling to the user equipment.
  • the foregoing second configuration signaling may be physical layer signaling, and is carried by downlink control information or a physical downlink shared channel.
  • the radio resources configured by the network side device may be allocated in the uplink frequency band of the FDD system; or By,
  • the radio resource may be allocated in an uplink subframe of the TDD system.
  • the radio resources may be configured in a dedicated frequency band, which refers to a frequency band dedicated to device-to-device communication.
  • the problem of device discovery of device-to-device communication in a cellular communication system is solved, which not only avoids interference between device discovery and cellular communication of device-to-device communication, but also ensures device discovery efficiency and helps Improve the breadth of device-to-device communication applications.

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Abstract

L'invention concerne un procédé de découverte de dispositif de communication de dispositif à dispositif, un équipement utilisateur et un dispositif côté réseau. Le procédé se déroule de la manière suivante : un équipement utilisateur reçoit une première signalisation de configuration pour la découverte de dispositif envoyée par un dispositif côté réseau ; en fonction de la première signalisation de configuration, l'équipement utilisateur détermine une ressource de découverte de dispositif utilisée pour la transmission de signal de découverte de dispositif, et effectue la découverte de dispositif par l'intermédiaire de la ressource de découverte de dispositif ; la première signalisation de configuration envoyant dans un formulaire de diffusion le ou les paramètres suivants : un paramètre de configuration de ressources radio de domaine temporel servant à indiquer une trame et/ou une sous-trame de découverte de dispositif ; un paramètre de configuration de ressources radio de domaine fréquentiel servant à indiquer un emplacement de bande de fréquences de découverte de dispositif ; et un paramètre de configuration de séquence servant à indiquer une séquence de signal de découverte de dispositif.
PCT/CN2014/072162 2013-02-18 2014-02-17 Procédé de découverte de dispositif de communication de dispositif à dispositif, équipement utilisateur et dispositif côté réseau WO2014124608A1 (fr)

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