WO2015067197A1 - D2d发现信号的发送方法和发送装置 - Google Patents
D2d发现信号的发送方法和发送装置 Download PDFInfo
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- WO2015067197A1 WO2015067197A1 PCT/CN2014/090496 CN2014090496W WO2015067197A1 WO 2015067197 A1 WO2015067197 A1 WO 2015067197A1 CN 2014090496 W CN2014090496 W CN 2014090496W WO 2015067197 A1 WO2015067197 A1 WO 2015067197A1
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- discovery
- discovery resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
Definitions
- the present application relates to the field of communications, and in particular, to a method and a transmitting apparatus for transmitting a D2D discovery signal.
- FIG. 1 shows a data communication flow between two terminals in a conventional cellular communication technology.
- services such as voice and data of two UEs (User Equipments) are exchanged through respective camping base stations (for example, eNBs) and a core network, where the core network may include a packet data network gateway ( PDN Gateway) / Service Gateway.
- PDN Gateway packet data network gateway
- D2D (Device-to-Device) is a terminal direct-through technology, which means that neighboring terminals can transmit data through a direct link in a short-range range without forwarding through a central node (ie, a base station), as shown in Figure 2.
- a central node ie, a base station
- the short-range communication characteristics and direct communication of the D2D technology itself have the following advantages:
- the terminal short-distance direct communication mode can achieve higher data rate, lower delay and lower power consumption
- the direct communication method of D2D can adapt to the local data sharing requirements of services such as wireless P2P, and provide data services with flexible adaptability;
- D2D direct communication can utilize a large number of widely distributed communication terminals in the network to expand the coverage of the network.
- LTE Long Term Evolution
- LTE Long Term Evolution
- D2D technology refers to the D2D discovery and communication process controlled by the LTE network operating in the LTE licensed frequency band.
- the advantages of D2D technology can be fully utilized, and the control of the LTE network can overcome the traditional Some problems with D2D technology, such as uncontrollable interference.
- the introduction of LTE D2D features will enable LTE technology to evolve from pure wireless mobile cellular communication technology to "Universal Connectivity Technology".
- the LTE D2D technology includes two aspects: D2D discovery and D2D communication.
- the D2D discovery refers to a D2D UE to discover other D2D UEs in the vicinity.
- the discovery between the D2D UEs is implemented by the discovery signal, and the discovery signal can carry one.
- the identification information such as device information, application information, service type, etc., and the discovery between D2D UEs has a wide range of application scenarios, such as:
- (Scenario 1) Intra-cell discovery, as shown in FIG. 3, for the situation found in the cell, the UE obtains synchronization with the network side, and the UE can acquire synchronization with each other according to synchronization with the network side, thereby synchronizing.
- the system discovers resources and discovers each other, and discovers that the resources used can also be obtained from the network side.
- A Direct discovery method.
- the UE is found to send a discovery signal with a discovery message, and other UEs discover and identify the UE by detecting the discovery message.
- the discovery message carries the identification information of the discovered UE, such as a device ID, an application ID, and the like.
- (B) Request response method The UE is found to send a discovery signal with a request message. After detecting the message, the other UE determines whether it is the requested target UE, or whether it is to be discovered by itself, and determines whether to send a corresponding response message according to the judgment result, and finds that the UE passes the detection response. The signal is found, wherein the identification message can be carried in both the request message and the response message.
- the UE needs to know that the receiving resource area is used for receiving other user discovery signals, and also needs to know that the sending resource area is used for sending the self discovery signal. Due to hardware limitation, the UE cannot simultaneously perform in one subframe. Discover the transmission and reception of signals.
- the system discovery resource includes a subframe set or a PRB set and a period in which the subframe set or the PRB set appears, and the period is a system discovery resource period, as shown in FIG. 6 , a system discovery resource period may include For several subframes, subframe A in FIG. 6 is a discovery signal receiving subframe of the UE, subframe B is a discovery signal transmission subframe of the UE, and subframe C is a cellular subframe.
- Each subframe includes a plurality of PRBs (PRBs are not shown in FIG. 6).
- the subframes or PRBs are consecutive uplink or downlink resources (for example, may be consecutive uplink subframes), and each discovery is found.
- the UE may perform detection of the discovery signals of other UEs in the subframe (subframes other than the subframe B) that do not transmit the discovery signal.
- the system discovery resource is generally configured by the base station when there is network coverage, and can be configured or pre-defined by the cluster head when there is no network coverage, and in which systems discover resources (ie, subframes), the UE is allowed to transmit its own discovery signal. Or cluster head configuration, or determined according to pre-agreed rules. In general, the UE can only know which system discovers the resource period and can send the discovery signal, and the probability of sending, and on which physical resource, the discovery signal is sent. It is also up to the UE itself to choose from the allowed resources.
- the system discovers that the resources are periodic.
- the UE may send a discovery signal in each discovery resource period, thereby increasing the probability of being discovered; and when the system finds fewer resources, if the UE is in the The discovery signal is sent in each discovery resource period of the system (that is, the period in which the discovery signal is transmitted is the same as the discovery resource period), which may cause serious mutual interference due to excessive discovery signals simultaneously in one cycle, thereby affecting D2D discovery. performance.
- the present invention provides a method for transmitting a D2D discovery signal and a transmitting device, which can limit the terminal to use the system to discover resources, for the problem that the physical resources used by the UE to transmit the D2D discovery signal cannot be controlled in the related art.
- the part of the discovery resource transmits the D2D signal, thereby preventing a large number of UEs from transmitting the D2D discovery signal by using the same discovery resource, thereby overcoming the problem that the simultaneous discovery signal is too much, causing interference between users and affecting normal communication.
- a method for transmitting a D2D discovery signal includes:
- the UE determines that the system discovers resources
- the UE determines a set of discovery resources used to transmit the D2D discovery signal
- the UE sends the D2D discovery signal by using the determined physical resource corresponding to the discovery resource set.
- the system discovery resource may include multiple discovery resource sets.
- the determining, by the UE, the system to discover the resource includes: determining, by the UE, the plurality of discovery resource sets included in the system discovery resource; and determining, by the UE, the discovery resource set that sends the D2D discovery signal, that the UE selects to send from the determined multiple discovery resource sets.
- the multiple discovery resource sets are configured by the base station to the UE or pre-configured on the UE side.
- the determining, by the UE, the discovery resource set for transmitting the D2D discovery signal includes: determining, by the UE, the number of discovery resource sets in the system discovery resource; determining the physics corresponding to each discovery resource set according to the number of the discovered resource set and the system discovery resource Resource; the UE selects a set of discovery resources used to transmit the D2D discovery signal.
- determining the number of discovery resource sets in the system discovery resource includes:
- the number of discovery resource sets in the system discovery resource is determined according to the network side or the cluster head discovery resource set number indication information.
- mapping relationship may be obtained by a predetermined agreement or by a network side or a cluster head.
- the period of the foregoing discovery resource set may be obtained by a predetermined agreement or by a network side or a cluster head.
- determining, according to the number of discovery resource sets and the system discovery resources, determining the physical resources corresponding to each discovery resource set includes: distributing, based on the number of discovery resource sets, system discovery resources in each system discovery resource period to each Discovering resource sets to determine physical resources corresponding to each discovery resource set; or selecting discovery resources in different system discovery resource cycles for different discovery resource sets according to system discovery resource cycle size and number of discovery resource sets, thereby Determine the resources corresponding to each discovery resource collection.
- the discovery resource set used by the UE to send the D2D discovery signal includes at least one of the following: selecting, according to an indication of the network side or the cluster head, a discovery resource set used for transmitting the D2D discovery signal;
- the UE determines a set of discovery resources used to transmit the D2D discovery signal, including:
- the discovery resource that can be used by the UE to send the D2D discovery signal in the system discovery resource is calculated according to the identifier corresponding to the UE, and is used as a discovery resource set used for transmitting the D2D discovery signal.
- the identifier corresponding to the UE includes at least one of the following:
- D2D ID application ID
- C-RNTI cell ID
- cluster ID cluster ID
- the UE determines a set of discovery resources used to transmit the D2D discovery signal, including:
- the format of the D2D discovery signal includes at least one of the following:
- a transmitting apparatus for a D2D discovery signal comprising:
- a first determining module configured to determine a system discovery resource
- a second determining module configured to determine a discovery resource set used for transmitting the D2D discovery signal
- a sending module configured to send a D2D discovery signal by using the determined physical resource corresponding to the set of discovery resources.
- the system discovery resource may include multiple discovery resource sets.
- the first determining module when determining the system discovery resource, is configured to determine that the system discovery resource includes multiple discovery resource sets; and, when determining the discovery resource set for transmitting the D2D discovery signal, the second determining module is configured to determine Among the plurality of discovery resource sets, a set of discovery resources used for transmitting the D2D discovery signal is selected.
- the plurality of discovery resources are configured by the base station to the device or pre-configured on the device side.
- the second determining module is configured to determine the number of discovery resource sets in the system discovery resource, and determine each discovery according to the number of discovery resource sets and the system discovery resources.
- the second determining module is further configured to determine, according to a mapping relationship between the size of the system discovery resource and the number of discovery resource sets, the number of discovery resource sets in the system discovery resource; or
- the second determining module is further configured to determine, according to the system discovery resource period and the period of the discovery resource set, the number of discovery resource sets in the system discovery resource; or
- the second determining module is configured to determine, according to the number of discovery resource sets of the network side or the cluster head, the number of discovery resource sets in the system discovery resource.
- mapping relationship is obtained by pre-agreed or by the network side or the cluster head.
- the period of discovering the resource set is obtained by pre-agreed or indicated by the network side or the cluster head.
- the second determining module when determining the physical resource corresponding to each discovery resource set according to the number of discovery resource sets and the system discovery resource, is configured to discover each system in the resource cycle based on the number of discovery resource sets.
- the discovery resource is evenly distributed to each set of discovery resources, thereby determining a physical resource corresponding to each set of discovery resources; or the second determining module is configured to use different sizes according to the period of the system discovery resources and the number of discovered resource sets.
- the discovery resource set selects the discovery resources in different system discovery resource periods, thereby determining the resources corresponding to each discovery resource set.
- the manner in which the second determining module selects the discovery resource set used for transmitting the D2D discovery signal includes at least one of the following:
- the second determining module when determining a set of discovery resources used for transmitting the D2D discovery signal, is configured to The identifier corresponding to the UE is used to calculate a discovery resource that can be used by the device to send a D2D discovery signal in the system discovery resource, and is used as a discovery resource set used for transmitting the D2D discovery signal.
- the identifier corresponding to the UE includes at least one of the following:
- D2D ID application ID
- C-RNTI cell ID
- cluster ID cluster ID
- the second determining module when determining the set of discovery resources used for transmitting the D2D discovery signal, is configured to format and/or carry information of the D2D discovery signal according to the need, and a format of the pre-agreed D2D discovery signal and/or Or a correspondence between the carried information and the set of discovery resources, and selecting a set of discovery resources used for transmitting the D2D discovery signal.
- the format of the D2D discovery signal includes at least one of the following:
- a UE is provided, where the UE includes:
- a processor configured to read a program in the memory, perform the following process: determining a system discovery resource; determining a discovery resource set used for transmitting the D2D discovery signal; and transmitting the D2D discovery through the transceiver by determining the physical resource corresponding to the discovery resource set signal;
- transceiver for receiving and transmitting data under the control of a processor
- a memory that holds the data that the processor uses when performing operations.
- the system discovery resource may include multiple discovery resource sets.
- the processor when determining that the system discovers the resource, is configured to read the program in the memory, and perform the following process: determining that the system discovery resource includes multiple discovery resource sets; and, when determining the discovery resource set for transmitting the D2D discovery signal, The processor is configured to read a program in the memory, and perform the following process: selecting a set of discovery resources used for transmitting the D2D discovery signal from the determined plurality of discovery resource sets.
- the multiple discovery resources are configured by the base station to the UE, or are pre-configured on the UE side.
- the processor when determining the set of discovery resources for transmitting the D2D discovery signal, is configured to read the program in the memory, and perform the following process: determining the number of discovery resource sets in the system discovery resource, and according to the number of discovery resource sets and The system discovers resources, determines physical resources corresponding to each set of discovery resources, and is used to select a set of discovery resources used for transmitting D2D discovery signals.
- the processor is configured to read a program in the memory, and perform the following process: determining a number of discovery resource sets in the system discovery resource according to a mapping relationship between a size of the system discovery resource and a number of discovery resource sets; or
- the processor is configured to read a program in the memory, and perform the following process: determining the number of discovery resource sets in the system discovery resource according to the system discovery resource period and the period of the discovery resource set; or
- the processor is configured to read a program in the memory, and perform the following process: determining the number of discovery resource sets in the system discovery resource according to the network side or the cluster head discovery resource set indication information.
- mapping relationship is obtained by pre-agreed or by the network side or the cluster head.
- the period of discovering the resource set is obtained by pre-agreed or indicated by the network side or the cluster head.
- the processor when determining the physical resource corresponding to each discovery resource set according to the number of discovery resource sets and the system discovery resource, the processor is configured to read the program in the memory, and perform the following process: based on the number of discovery resource sets, each will The system discovers that the system discovery resources in the resource cycle are evenly distributed to each discovery resource set, thereby determining the physical resources corresponding to each discovery resource set; or the processor is used to read the program in the memory, and performs the following process: according to the system The period size of the discovery resource and the number of discovery resource sets are selected, and the discovery resources in different system discovery resource periods are selected for different discovery resource sets, thereby determining the resources corresponding to each discovery resource set.
- the processor is configured to read the program in the memory, and perform the following process: the manner of selecting the set of discovery resources used for transmitting the D2D discovery signal includes at least one of the following:
- the processor when determining the set of discovery resources used for transmitting the D2D discovery signal, is configured to read the program in the memory, and perform the following process: calculating, according to the identifier corresponding to the UE, the system discovery resource can be used for the device
- the discovery resource of the D2D discovery signal is sent as a set of discovery resources used to transmit the D2D discovery signal.
- the identifier corresponding to the UE includes at least one of the following:
- D2D ID application ID
- C-RNTI cell ID
- cluster ID cluster ID
- the processor when determining a set of discovery resources for transmitting the D2D discovery signal, is configured to read a program in the memory, and perform the following process: format and/or carried information of the D2D discovery signal to be transmitted according to need, and pre-agreed The mapping between the format of the D2D discovery signal and/or the carried information and the set of discovery resources selects a set of discovery resources used to transmit the D2D discovery signal.
- the format of the D2D discovery signal includes at least one of the following:
- the present invention enables the UE to use the physical resources in the discovery resource set to transmit the D2D discovery signal, so that the terminal can use the partial discovery resources in the system discovery resource to transmit the D2D signal, thereby preventing a large number of UEs from using the same resource to send the D2D discovery signal, thereby overcoming the simultaneous Excessive discovery signals are sent, causing interference between users and affecting normal communication.
- FIG. 1 is a schematic diagram of communication between UEs through a network in the prior art
- FIG. 2 is a schematic diagram of direct communication between UEs in the prior art
- 3 to 5 are schematic diagrams of mutual discovery between UEs in the prior art
- FIG. 6 is a schematic diagram of a corresponding subframe of a system discovery resource
- FIG. 7 is a flowchart of a method for transmitting a D2D discovery signal according to an embodiment of the present application.
- FIG. 8 and FIG. 9 are schematic diagrams of dividing a system discovery resource into different discovery resource sets in a transmission scheme of a D2D discovery signal according to an embodiment of the present application;
- FIG. 10 is a block diagram of a transmitting apparatus of a D2D discovery signal according to an embodiment of the present application.
- FIG. 11 is a structural block diagram of a UE according to an embodiment of the present application.
- FIG. 12 is a structural block diagram of a computer capable of implementing the technical solution according to the present application.
- a method of transmitting a D2D discovery signal is provided.
- the sending method includes:
- Step S701 the UE determines that the system discovers resources
- Step S703 the UE determines a discovery resource set used for transmitting the D2D discovery signal.
- Step S705 The UE sends a D2D discovery signal by using the determined physical resource corresponding to the discovery resource set.
- the system discovery resource may include multiple discovery resource sets, and the physical resources corresponding to different discovery resource sets are different or completely different.
- the discovery resource collection is also called the discovery resource pool.
- the manner in which the UE determines the set of discovery resources for transmitting the D2D discovery signal will be separately described below.
- the UE selects a discovery resource set used for transmitting the D2D discovery signal from the multiple discovery resource sets.
- the number of discovery resource sets in the system discovery resource may be first determined; and then each discovery resource collection is determined according to the number of discovery resource sets and the system discovery resources. Corresponding physical resources; next, the UE selects a set of discovery resources used to transmit the D2D discovery signal.
- multiple methods may be used, for example:
- the mapping relationship may be obtained by a predetermined agreement or by a network side (for example, a base station) or a cluster head.
- the period of the foregoing discovery resource set may be obtained by a predetermined agreement or by a network side (for example, a base station) or a cluster head.
- the system discovery resources in each system discovery resource period may be equally allocated based on the number of discovery resource sets.
- Each discovery resource set determines the physical resource corresponding to each discovery resource set; or, according to the system discovery resource cycle size and the number of discovery resource sets, select different system discovery resource cycles for different discovery resource sets.
- the discovery resources determine the resources corresponding to each discovery resource collection.
- the process of the UE selecting the discovery resource set used for transmitting the D2D discovery signal may include at least one of the following:
- the UE may calculate, according to the identifier corresponding to the UE, a discovery resource that can be used by the UE to send a D2D discovery signal in the system discovery resource, as a discovery resource set used for transmitting the D2D discovery signal.
- the UE does not need to first determine all the discovery resource sets according to the information such as the number of discovery resource sets, and can directly obtain the discovery resource set to be used by the D2D discovery signal.
- the identifier corresponding to the UE may include at least one of the following: a D2D ID, an application ID, a C-RNTI, a cell ID, and a cluster ID.
- the format of the D2D discovery signal includes at least one of the following: a discovery sequence, a discovery message, a request message, or a response message.
- the period of the discovery resource set that the UE can use to send the D2D discovery signal is greater than the system discovery resource period, and/or the discovery resource set that the UE can use to send the D2D discovery signal has less physical resources than the system discovery resource in the same period.
- the number of physical resources in the period the different D2D UEs may be divided into different resources to send discovery signals, thereby reducing the interference between the discovery signals and improving the discovery probability. In this way, each UE determines the resources used by the UE to transmit the D2D discovery signal.
- different UE groups can use different regions in the system discovery resource to reduce interference between UEs and improve the overall system. The probability of discovery.
- the UE determines a system discovery resource for transmitting and receiving D2D discovery signals in the system
- the UE determines the number of discovery resource sets in the system, and determines the physical resources corresponding to each discovery resource set according to the number of discovery resource sets and the system discovery resources in the system;
- the discovery resource set is a subset of the system discovery resources, and the different discovery resource sets include different physical resources, so that different UEs or UE groups send D2D discovery signals in different discovery resource sets.
- a discovery resource set generally also includes a subframe set or a PRB set, and a period in which the set appears, the period is greater than or equal to the system discovery resource period, as shown in FIG. 8;
- the method for the UE to determine the number of discovered resource sets includes:
- the UE determines the discovery resource set according to the mapping relationship between the size of the pre-agreed system discovery resource and the number of discovery resource sets, or according to the mapping relationship between the size of the system discovery resource and the number of discovery resource sets indicated by the base station/cluster head. number.
- the mapping relationship can be determined by the base station/cluster head according to the current number of users, the channel environment, and the discovery of the distance. Example of mapping relationship:
- the number of resources occupied by each discovery resource set is fixed.
- the UE obtains the number of discovery resource sets according to the size of the system discovery resources and the maximum number of discovery resource sets that can be supported (if the number of resources occupied by the resource collection is found)
- the number of resources that cannot be occupied by the system discovery resource is divisible, and the rounding operation can be performed; for example, each discovery resource set occupies 8 subframes in each system discovery resource period, and currently each system discovery resource period has a total of 32 subframes, which can be allocated to 4 discovery resource sets, the corresponding number of discovery resource sets is 4;
- the discovery resource collection period and the system discovery resource period are respectively; the system discovery resource period is 2s, and the discovery resource period of each discovery resource set is 8s, then the number of discovery resource sets can be 4;
- the number of resource collections found in the system directly received by the UE or the cluster head; for example, the number of discovery resources in the system is determined by the base station or the cluster head through the UE-specific high-level signaling or the system broadcast mode. Inform the UE.
- the UE may allocate the system discovery resources to each discovery resource set to determine the physical resources corresponding to each discovery resource set; for example, the discovery resources in each system discovery resource period may be equally allocated to each discovery resource.
- the set, the period of each discovery resource set is the same as the system discovery resource, but the resources in one cycle are a subset of the system discovery resources.
- the subframes corresponding to the discovery resource sets A1 and A0 and each are shown. Discovering the period of the resource collection; for example, sequentially assigning the discovery resources in each system discovery resource period to each discovery resource set (the resources in each cycle are only assigned to one discovery resource set), so that each discovery resource set
- the period is N times that of the system discovery resource, but the resources in one cycle are the same as the system discovery resources.
- the subframes corresponding to the discovery resource sets A0, A1, and A2 and the period of each discovery resource set are shown. .
- the UE may also select different cycle start positions for different discovery resource sets according to the period of the discovery resource set and the location of the system discovery resource, and the number of discovery resource sets, thereby determining the resources of the discovery resource set;
- the UE determines the set of discovery resources used, and sends a D2D discovery signal on the physical resource corresponding to the discovery resource set;
- the method for the UE to determine the set of discovery resources used includes:
- the UE learns the set of discovery resources used according to the indication of the base station or the cluster head; for example, indicates the discovery resource set index used by the UE through the high-level signaling specific to the UE, or indicates the UE by using the downlink control signaling indication (DCI).
- Discovery resource collection index indicates the discovery resource set index used by the UE through the high-level signaling specific to the UE, or indicates the UE by using the downlink control signaling indication (DCI).
- DCI downlink control signaling indication
- the UE randomly selects one discovery resource set from all discovery resource sets; the UE discovers resources in each The set of discovery resources selected in the cycle may be the same (ie, only selected once), or may be different (ie, selected every cycle);
- the UE learns the set of discovery resources used by itself according to its corresponding identifier and the corresponding relationship between the agreed identifier and the discovery resource set;
- the identifier corresponding to the UE may be a D2D ID of the UE, a corresponding application ID, a C-RNTI, etc., may distinguish information of different UEs or applications, or may be a Cell ID, a Cluster ID, etc. may distinguish different cells or
- the cluster information may also be a combination of the above information.
- the UE determines the set of discovery resources used to transmit the D2D discovery signal according to the format of the D2D discovery signal to be transmitted or the information carried.
- the UE selects one or more discovery resources from the physical resources corresponding to the discovery resource set for transmitting the D2D discovery signal; and discovers resources at other time. Receiving D2D discovery signals of other UEs;
- the UE determines a system discovery resource for transmitting and receiving D2D discovery signals in the system
- the UE determines a set of discovery resources used by the UE to generate a D2D discovery signal from the system discovery resources, and sends a D2D discovery signal on the physical resources in the determined discovery resource set;
- the set of discovery resources used by the UE to transmit the D2D discovery signal is a subset of the system discovery resources
- a method for the UE to determine a set of discovery resources used by the UE to transmit a D2D discovery signal from the system discovery resource including:
- the UE calculates, according to the corresponding identifier of the UE, the correspondence between the agreed identifier and the discovery resource index used by the UE to send the D2D discovery signal, that the system discovery resource can be used for the UE to send the D2D discovery.
- the discovery resource of the signal as a set of discovery resources used by the D2D discovery signal itself (corresponding to the third method described above);
- the identifier corresponding to the UE may be a D2D ID of the UE, a corresponding application ID, a C-RNTI, etc., which may distinguish information of different UEs or applications, or may be a Cell ID, a Cluster ID, etc., which can distinguish different cells or clusters. Information can also be a combination of the above information.
- the UE determines the set of discovery resources used to transmit the D2D discovery signal according to the format of the D2D discovery signal to be transmitted or the information carried (corresponding to the above method 4).
- the format of the D2D discovery signal includes, but is not limited to, a discovery sequence, a discovery message, a request message, or a response message.
- the information content carried by the D2D discovery signal includes a D2D ID, an application ID, a UE type, and the like. For example, when the UE sends the discovery sequence, the discovery message, the request message, and the response message, the three different discovery resource sets may be separately used for sending, and the discovery resource set corresponding to different D2D discovery signal formats may be obtained through pre-configuration.
- the UE selects one or more discovery resources from the physical resources corresponding to the discovery resource set for transmitting the D2D discovery signal; and receives the discovery resources at other times. D2D discovery signals of other UEs.
- the UE is within the coverage of the base station and is a D2D UE.
- the UE receives the SIB broadcast of the base station, and learns the system discovery resources for the D2D discovery signal transmission and reception in the system through the discovery resource indication field in the broadcast.
- the discovery resource indication field includes discovery resource indication information for D2D discovery signal transmission and discovery resource indication information for D2D discovery signal reception, and the discovery resource indication information used for D2D discovery signal transmission includes several discovery resource sets.
- the indication information, the indication information of each discovery resource set includes a subframe index and a respective discovery resource period in the discovery resource period. Specifically, it is assumed that the current indication information indicates that three discovery resource sets are used for sending the D2D discovery signal;
- the UE receives the SIB broadcast of the base station, and uses the discovery resource set indication field in the broadcast to learn the three discovery resource sets for the D2D discovery signal transmission in the system;
- the UE randomly selects one discovery resource set from the three discovery resource sets, and uses the physical resource corresponding to the discovery resource set as the transmission resource of the D2D discovery signal; and assumes that the discovery resource set selected by the UE is the discovery resource set 0;
- the UE selects one or more discovery resources from the physical resources corresponding to the discovery resource set 0 for transmitting the D2D discovery signal.
- the UE is within the coverage of the base station and is a D2D UE.
- the UE receives the SIB broadcast of the base station, and learns the system discovery resources for the D2D discovery signal transmission and reception in the system through the discovery resource indication field in the broadcast.
- the discovery resource indication field includes discovery resource indication information for D2D discovery signal transmission and discovery resource indication information for D2D discovery signal reception, and the discovery resource indication information used for D2D discovery signal transmission includes a system discovery resource period. Subframe index and corresponding system discovery resource period. Specifically, it is assumed that the system discovery resource sub-frame index used by the cell where the UE is currently located is 0-2, and the period is 1 s;
- the UE receives the SIB broadcast of the base station, and the discovery resource set indication field in the broadcast indicates the number of discovery resource sets in the system; for example, the base station indicates the number of discovery resource sets by using 2-bit signaling, and the current indicated number is 2;
- the UE allocates the discovery resources in each system discovery resource period to each discovery resource set according to the agreed discovery resource set resource allocation manner (the resources in each period are only assigned to one discovery resource set, and each discovery resource) The set is allocated in turn, so that the period of each discovery resource set is twice that of the system discovery resource, but the resources in one cycle are the same as the system discovery resources, as shown in FIG. 9. It is found that the resource set 0 occupies the resources of the odd cycle, and the resource set 1 is found to occupy the resources of the even cycle.
- the UE randomly selects one discovery resource set from the two discovery resource sets, and uses the physical resource corresponding to the discovery resource set as the transmission resource of the D2D discovery signal; and assumes that the discovery resource set selected by the UE is the discovery resource set 0;
- the UE selects one or more discovery resources for transmitting D2D from the physical resource corresponding to the discovery resource set 0 (subframe index is 0-2) The signal is found and the D2D discovery signals of other UEs are detected on other subframes of the system discovery resource.
- the UE is within the coverage of the base station and is a D2D UE.
- the UE receives the UE-specific high-level signaling sent by the base station, and learns the system discovery resources used for the D2D discovery signal transmission and reception in the system.
- the UE selects different resource starting positions for the two discovery resource sets according to the location of the system discovery resource and the discovery resource collection period, so that the resources in each discovery resource collection period are the same as the system discovery resources, such as Figure 8 shows.
- the resource set 0 is found to occupy an odd-period resource, and the resource set 1 is found to occupy an even-period resource;
- the UE selects one discovery resource set from the two discovery resource sets according to its own D2D ID, and uses the physical resource corresponding to the discovery resource set as the transmission resource of the D2D discovery signal; wherein the resource collection index and the D2D ID are found.
- the UE selects one or more discovery resources for transmitting D2D from the physical resource corresponding to the discovery resource set 0 (subframe index is 0-2) The signal is found and the D2D discovery signals of other UEs are detected on other subframes of the system discovery resource.
- the UE is outside the coverage of the base station and is a D2D UE.
- the UE receives the discovery resource set indication information of the cluster head, and knows that the number of discovery resource sets in the system is 3, and the information is sent through the SIB broadcast;
- each discovery resource set occupies a different discovery subframe within a system discovery resource period;
- the UE randomly selects one discovery resource set from the three discovery resource sets, and uses the physical resource corresponding to the discovery resource set as the transmission resource of the D2D discovery signal. ;
- the UE selects one or more discovery resources from the physical resources corresponding to the selected discovery resource set for transmitting the D2D discovery signal, and in the period The D2D discovery signal of the other UE is detected on the discovery resource of the other subframes; for example, if the discovery resource set selected by the UE is 1 in a certain discovery resource set period, the UE selects a discovery from the subframe corresponding to the subframe index 1
- the resource is used to transmit a D2D discovery signal and detect D2D discovery signals of other UEs on subframes 0 and 2.
- the UE receives the high layer signaling indication of the base station, and learns the system discovery resources used for the D2D discovery signal transmission and reception in the system.
- the UE selects one of the system discovery resources according to the Cell ID of the serving cell and its own D2D ID. Part of the resource acts as a collection of discovery resources that send D2D discovery signals by itself.
- the method of selection is as follows:
- the UE selects one or more discovery resources from the determined discovery resource set for transmitting the D2D discovery signal, and detects on the discovery resources of other subframes in the period. D2D discovery signals of other UEs.
- FIG. 8, FIG. 9, Table 1, Table 2, and the above descriptions are only for illustration.
- the present application can configure a more complex discovery resource set with more complex subframe distribution. An enumeration.
- the method for transmitting a D2D discovery signal can divide the discovery resources into different sets, and the method for configuring the resources can be different according to the system discovery resource size.
- the discovery resource grouping by constraining the resource allocation of the UE, enables different UE groups to use different regions in the system discovery resource, reduce interference between UEs, and improve the overall discovery probability of the system, for example, can find fewer resources in the system.
- the discovery delay of the UE is not significantly improved.
- a transmitting apparatus for a D2D discovery signal is also provided.
- the transmitting apparatus includes:
- a first determining module 101 configured to determine a system discovery resource
- a second determining module 102 configured to determine a discovery resource set used to send the D2D discovery signal
- the sending module 103 is configured to send the D2D discovery signal by using the determined physical resource corresponding to the set of discovery resources.
- the system discovery resource may include multiple discovery resource sets.
- the first determining module 101 is configured to determine that the system discovery resource includes multiple discovery resource sets; and, when determining the discovery resource set for transmitting the D2D discovery signal, the second determining module 102 is determined. And a set of discovery resources used for selecting a D2D discovery signal to be sent from the determined plurality of discovery resource sets.
- the plurality of discovery resources are configured by the base station to the device or pre-configured on the device side.
- the second determining module 102 is further configured to determine the number of discovery resource sets in the system discovery resource, and determine each according to the number of discovery resource sets and the system discovery resources.
- the physical resources corresponding to the discovery resource set are used to select a set of discovery resources used for transmitting the D2D discovery signal.
- the second determining module 102 is further configured to: according to the size of the system discovery resource and the number of discovery resource sets Mapping relationship, determining the number of discovery resource collections in the system discovery resource; or
- the second determining module 102 is configured to determine, according to the system discovery resource period and the period of the discovery resource set, the number of discovery resource sets in the system discovery resource; or
- the second determining module 102 is configured to determine, according to the number of discovery resource sets of the network side or the cluster head, the number of discovery resource sets in the system discovery resource.
- the mapping relationship may be obtained by a pre-agreed agreement or by a network side or a cluster head.
- the period of discovering the resource set is obtained by pre-agreed or indicated by the network side or the cluster head.
- the second determining module 102 is further configured to discover each resource discovery resource period based on the number of the discovery resource set.
- the system discovery resource is evenly distributed to each discovery resource set, thereby determining a physical resource corresponding to each discovery resource set; or the second determining module 102 is configured to discover the resource cycle size according to the system, and discover the number of resource collections. Selecting discovery resources in different system discovery resource periods for different discovery resource sets, thereby determining resources corresponding to each discovery resource set.
- the manner in which the second determining module 102 selects the discovery resource set used for transmitting the D2D discovery signal may include at least one of the following:
- the second determining module 102 when determining the set of discovery resources used for transmitting the D2D discovery signal, is further configured to calculate, according to the identifier corresponding to the UE, a discovery that the system discovery resource can be used for sending the D2D discovery signal by the device.
- the resource as a set of discovery resources used to transmit the D2D discovery signal (corresponding to the second method described above).
- the identifier corresponding to the UE includes at least one of the following:
- D2D ID application ID
- C-RNTI cell ID
- cluster ID cluster ID
- the second determining module 102 when determining the set of discovery resources used for transmitting the D2D discovery signal, is further configured to: according to the format and/or carried information of the D2D discovery signal to be sent, and the format of the pre-agreed D2D discovery signal. And the corresponding relationship between the information carried and the set of discovery resources, and the set of discovery resources used for transmitting the D2D discovery signal (corresponding to the above manner 3).
- the format of the D2D discovery signal includes at least one of the following:
- a UE is further provided. As shown in FIG. 11, the UE includes:
- the processor 1101 is configured to read a program in the memory 1103, and perform the following process: determining a system discovery resource; determining a discovery resource set used for transmitting the D2D discovery signal; and determining, by using the determined physical resource corresponding to the discovery resource set, by the transceiver 1101 Send a D2D discovery signal;
- the transceiver 1103 is configured to receive and transmit data under the control of the processor 1101.
- the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1101 and various circuits of memory represented by memory 1103.
- the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
- the bus interface provides an interface.
- the transceiver 1102 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
- the user interface 1104 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
- the processor 1101 is responsible for managing the bus architecture and general processing, and the memory 1103 can store data used by the processor 1101 when performing operations.
- the object of the present application can also be achieved by running a program or a set of programs on any computing device.
- the computing device can be a well-known general purpose device.
- the object of the present application can also be achieved by merely providing a program product comprising program code for implementing the method or apparatus. That is to say, such a program product also constitutes the present application, and a storage medium storing such a program product also constitutes the present application. It will be apparent that the storage medium may be any known storage medium or any storage medium developed in the future.
- a storage medium (which may be a ROM, a RAM, a hard disk, a detachable memory, etc.), in which a computer program for transmitting a D2D discovery signal is embedded,
- the computer program has a code segment configured to perform the steps of: determining a system discovery resource; determining a set of discovery resources used by the UE to transmit the D2D discovery signal; and transmitting the D2D discovery signal by the determined physical resource corresponding to the discovery resource set.
- a computer program having a code segment configured to perform the following D2D discovery signal transmission step: determining a system discovery resource; determining a discovery used by the UE to transmit a D2D discovery signal A set of resources; transmitting a D2D discovery signal by determining a physical resource corresponding to the set of discovery resources.
- a program constituting the software is installed from a storage medium or a network to a computer having a dedicated hardware structure, such as the general-purpose computer 1100 shown in FIG.
- a computer having a dedicated hardware structure such as the general-purpose computer 1100 shown in FIG.
- a central processing module (CPU) 1201 executes various processes in accordance with a program stored in a read only memory (ROM) 1202 or a program loaded from a storage portion 1208 to a random access memory (RAM) 1203.
- ROM read only memory
- RAM random access memory
- data required when the CPU 1201 executes various processes and the like is also stored as needed.
- the CPU 1201, the ROM 1202, and the RAM 1203 are connected to each other via a bus 1204.
- Input/output interface 1205 is also coupled to bus 1204.
- the following components are connected to the input/output interface 1205: an input portion 1206 including a keyboard, a mouse, etc.; an output portion 1207 including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), and the like, and a speaker and the like;
- the storage portion 1208 includes a hard disk or the like; and the communication portion 1209 includes a network interface card such as a LAN card, a modem, and the like.
- the communication section 1209 performs communication processing via a network such as the Internet.
- the driver 1210 is also connected to the input/output interface 1205 as needed.
- a removable medium 1211 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory or the like is mounted on the drive 1210 as needed, so that a computer program read therefrom is installed into the storage portion 1208 as needed.
- a program constituting the software is installed from a network such as the Internet or a storage medium such as the detachable medium 1211.
- such a storage medium is not limited to the removable medium 1211 shown in FIG. 12 in which a program is stored and distributed separately from the device to provide a program to the user.
- the detachable medium 1211 include a magnetic disk (including a floppy disk (registered trademark)), an optical disk (including a compact disk read only memory (CD-ROM) and a digital versatile disk (DVD)), and a magneto-optical disk (including a mini disk (MD) (registered trademark) )) and semiconductor memory.
- the storage medium may be a ROM 1202, a hard disk included in the storage portion 1208, or the like, in which programs are stored, and distributed to the user together with the device including them.
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Abstract
本申请公开了一种D2D发现信号的发送方法和装置，其中，该方法包括：UE确定系统发现资源；确定发送D2D发现信号所用的发现资源集合；通过确定的发现资源集合所对应的物理资源，发送D2D发现信号。本申请通过使UE利用发现资源集合中的物理资源发送D2D发现信号，能够限制终端使用系统发现资源中的部分发现资源发送D2D信号，从而避免大量UE使用相同的资源发送D2D发现信号，克服了同时发送的发现信号过多而导致用户间干扰、影响正常通信的问题，提高了UE之间相互发现的性能。
Description
本申请要求在2013年11月08日提交中国专利局、申请号为201310553883.4、发明名称为“D2D发现信号的发送方法和发送装置”的中国专利申请，和在2014年03月04日提交中国专利局、申请号为201410076858.6、发明名称为“D2D发现信号的发送方法和发送装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
本申请涉及通信领域，并且特别地，涉及一种D2D发现信号的发送方法和发送装置。
图1示出了传统的蜂窝通信技术中，两个终端之间的数据通信流程。如图1所示，两个UE(User Equipment，用户设备)的语音和数据等业务经过各自驻留的基站(例如，eNB)以及核心网进行交互，其中，核心网可以包括分组数据网网关(PDN Gateway)/服务网关(Service Gateway)。
D2D(Device-to-Device)即终端直通技术，是指邻近的终端可以在近距离范围内通过直连链路进行数据传输的方式，不需要通过中心节点(即基站)进行转发，如图2所示，D2D技术本身的短距离通信特点和直接通信方式使其具有如下优势：
(1)终端近距离直接通信方式可实现较高的数据速率、较低的延迟和较低的功耗；
(2)利用网络中广泛分布的用户终端以及D2D通信链路的短距离特点，可以实现频谱资源的有效利用；
(3)D2D的直接通信方式能够适应如无线P2P等业务的本地数据共享需求，提供具有灵活适应能力的数据服务；
(4)D2D直接通信能够利用网络中数量庞大且分布广泛的通信终端以拓展网络的覆盖范围。
LTE(Long Term Evolution，长期演进)D2D技术是指工作在LTE授权频段上的受LTE网络控制的D2D发现和通信过程，一方面可以充分发挥D2D技术的优势，同时LTE网络的控制也可以克服传统D2D技术的一些问题，例如干扰不可控等。LTE D2D特性的引入将使LTE技术从单纯的无线移动蜂窝通信技术向着“通用连接技术”(Universal Connectivity Technology)的方向演进。
LTE D2D技术包括D2D发现和D2D通信两个方面，其中，D2D发现指一个D2D UE去发现附近的其他D2D UE，D2D UE间的发现靠发现信号来实现，发现信号可以携带一
定的识别信息，比如设备信息、应用信息、服务类型等，并且，D2D UE间的发现有着很广泛的应用场景，例如：
(场景一)小区内发现，如图3所示，对于小区内发现的情况，UE都获得了与网络侧的同步，则UE可以根据各自与网络侧的同步，获取相互间的同步从而在同步的系统发现资源上进行相互发现，发现所用的资源也可以从网络侧获得。
(场景二)小区间发现，如图4所示，对于小区间发现的情况，由于两个小区之间可能是不同步的，如果按照各自与网络侧的同步，则两个UE间可能是不同步的，无法直接进行发现，同时UE也可能不知道邻小区所用的系统发现资源。
(场景三)无网络覆盖的发现，如图5所示，对于无网络的情况，UE间同样是异步的，需要首先获得同步，才能进行发现。一般无网络情况下，在一个相互临近的簇内会有一个簇头来发送同步信号，以使周围的UE能够通过与它的同步获得相互同步，进而进行发现。这里，簇头在同步方面的作用和有网络覆盖时基站的作用是类似的。
D2D UE间的发现至少可以有以下两种方式：
(A)直接发现方式。被发现UE发送带有发现消息的发现信号，其他UE通过检测该发现消息来发现并识别该UE。发现消息中携带该被发现UE的识别信息，比如设备ID、应用ID等。
(B)请求响应方式。发现UE发送带有请求消息的发现信号，其他UE检测到该消息后，判断是否为请求的目标UE，或者本身是否要被发现，根据判断结果确定是否发送相应的响应消息，发现UE通过检测响应信号进行发现，其中，请求消息和响应消息中都可以携带识别信息。
此外，在D2D发现过程中，UE需要知道接收资源区域用于其他用户发现信号的接收，也需要知道发送资源区域用于自身发现信号的发送，由于硬件限制，UE无法在一个子帧内同时进行发现信号的发送和接收。一般情况下，系统发现资源包括一个子帧集合或者PRB集合以及该子帧集合或者PRB集合出现的周期，该周期即为系统发现资源周期，如图6所示，一个系统发现资源周期内可以包含若干子帧，图6中的子帧A为UE的发现信号接收子帧，子帧B为UE的发现信号发送子帧，子帧C为蜂窝子帧。其中，每个子帧包含若干PRB(图6中未示出PRB)，一般情况下这些子帧或者PRB是连续的上行或者下行资源(例如，可以是连续的上行子帧)，而在每个发现资源周期内，UE可以在不发送发现信号的子帧(子帧B以外的其他子帧)内都进行其他UE的发现信号的检测。系统发现资源在有网络覆盖时一般由基站进行配置，在没有网络覆盖时可以由簇头配置或者预先定义，在哪些系统发现资源(即子帧)中允许UE发送自身的发现信号也可以由网络或者簇头配置，或者按照预先约定的规则确定。一般情况下，UE只能获知在哪个系统发现资源周期内可以发送发现信号，以及发送的概率多大，而具体在哪个物理资源上发送发现信号，
还要靠UE自身从允许的资源中进行选择。
并且，系统发现资源是周期性的，当系统发现资源较多时，UE可以在每个发现资源周期内都发送发现信号，从而提高被发现的概率；而当系统发现资源较少时，如果UE在系统的每个发现资源周期内都发送发现信号(即发送发现信号的周期与发现资源周期相同)，则可能因为一个周期内同时存在的发现信号过多产生严重的相互干扰，进而影响D2D发现的性能。
针对相关技术中无法控制UE发送D2D发现信号所使用的物理资源而导致发现性能降低、影响正常通信的问题，目前尚未提出有效的解决方案。
发明内容
针对相关技术中无法控制UE发送D2D发现信号所使用的物理资源而导致发现性能降低、影响正常通信的问题，本申请提出一种D2D发现信号的发送方法和发送装置，能够限制终端使用系统发现资源中的部分发现资源发送D2D信号，从而避免大量UE使用相同的发现资源发送D2D发现信号，克服了同时发送的发现信号过多而导致用户间干扰、影响正常通信的问题。
本申请的技术方案是这样实现的：
根据本申请的一个方面，提供了一种D2D发现信号的发送方法，该发送方法包括：
UE确定系统发现资源；
UE确定发送D2D发现信号所用的发现资源集合；
UE通过确定的发现资源集合所对应的物理资源，发送D2D发现信号。
其中，系统发现资源可以包括多个发现资源集合。
一方面，UE确定系统发现资源包括：UE确定系统发现资源中包含的多个发现资源集合；并且，UE确定发送D2D发现信号的发现资源集合包括：UE从确定的多个发现资源集合中选择发送D2D发现信号所用的发现资源集合。
其中，多个发现资源集合由基站配置给UE、或在UE侧预先配置。
另一方面，UE确定发送D2D发现信号的发现资源集合包括：UE确定系统发现资源中的发现资源集合的数目；根据发现资源集合的数目和系统发现资源，确定每个发现资源集合所对应的物理资源；UE选择发送D2D发现信号所用的发现资源集合。
并且，确定系统发现资源中的发现资源集合的数目包括：
根据系统发现资源的大小与发现资源集合的数目之间的映射关系，确定系统发现资源中发现资源集合的数目；或者，
根据系统发现资源周期以及发现资源集合的周期，确定系统发现资源中的发现资源集
合的数目；或者，
根据网络侧或者簇头的发现资源集合数目指示信息，确定系统发现资源中的发现资源集合的数目。
此外，上述映射关系可以由预先约定得到、或者由网络侧或簇头指示得到。
并且，上述发现资源集合的周期可以由预先约定得到、或者由网络侧或簇头指示得到。
此外，根据发现资源集合的数目和系统发现资源，确定每个发现资源集合所对应的物理资源包括：基于发现资源集合的数目，将每个系统发现资源周期内的系统发现资源平均分配给每个发现资源集合，从而确定每个发现资源集合所对应的物理资源；或者根据系统发现资源周期大小、以及发现资源集合的数目，为不同的发现资源集合选择不同系统发现资源周期内的发现资源，从而确定每个发现资源集合所对应的资源。
其中，UE选择发送D2D发现信号所用的发现资源集合包括以下至少之一：根据网络侧或簇头的指示，选择发送D2D发现信号所用的发现资源集合；
在多个发现资源集合中随机选择发送D2D发现信号所用的发现资源集合；
根据UE对应的标识、以及预定的标识与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合；
根据需要发送的D2D发现信号的格式和/或D2D发现信号所携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
再一方面，UE确定发送D2D发现信号所用的发现资源集合包括：
根据UE对应的标识，计算得到所述系统发现资源中能够用于该UE发送D2D发现信号的发现资源，作为发送D2D发现信号所用的发现资源集合。
并且，UE对应的标识包括以下至少之一：
D2D ID、应用ID、C-RNTI、小区ID、簇ID。
又一方面，UE确定发送D2D发现信号所用的发现资源集合包括：
根据需要发送的D2D发现信号的格式和/或携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
并且，D2D发现信号的格式包括以下至少之一：
发现序列、发现消息、请求消息或者响应消息。
根据本申请的另一方面，提供了一种D2D发现信号的发送装置，该发送装置包括：
第一确定模块，用于确定系统发现资源；
第二确定模块，用于确定发送D2D发现信号所用的发现资源集合；
发送模块，用于通过确定的发现资源集合所对应的物理资源，发送D2D发现信号。
其中，系统发现资源可以包括多个发现资源集合。
一方面，在确定系统发现资源时，第一确定模块用于确定系统发现资源中包含多个发现资源集合；并且，在确定发送D2D发现信号的发现资源集合时，第二确定模块用于从确定的多个发现资源集合中选择发送D2D发现信号所用的发现资源集合。
其中，多个发现资源由基站配置给所述装置、或在所述装置侧预先配置。
另一方面，在确定发送D2D发现信号的发现资源集合时，第二确定模块用于确定系统发现资源中的发现资源集合的数目，以及根据发现资源集合的数目和系统发现资源，确定每个发现资源集合所对应的物理资源，并且用于选择发送D2D发现信号所用的发现资源集合。
此外，第二确定模块还用于根据系统发现资源的大小与发现资源集合的数目之间的映射关系，确定系统发现资源中的发现资源集合的数目；或者，
第二确定模块还用于根据系统发现资源周期以及发现资源集合的周期，确定系统发现资源中的发现资源集合的数目；或者，
第二确定模块用于根据网络侧或者簇头的发现资源集合数目指示信息，确定系统发现资源中的发现资源集合的数目。
并且，映射关系由预先约定得到、或者由网络侧或簇头指示得到。
并且，发现资源集合的周期由预先约定得到、或者由网络侧或簇头指示得到。
此外，在根据发现资源集合的数目和系统发现资源，确定每个发现资源集合所对应的物理资源时，第二确定模块用于基于发现资源集合的数目，将每个系统发现资源周期内的系统发现资源平均分配给每个发现资源集合，从而确定每个发现资源集合所对应的物理资源；或者，第二确定模块用于根据系统发现资源的周期大小、以及发现资源集合的数目，为不同的发现资源集合选择不同系统发现资源周期内的发现资源，从而确定每个发现资源集合所对应的资源。
并且，第二确定模块选择发送D2D发现信号所用的发现资源集合的方式包括以下至少之一：
根据网络侧或簇头的指示，选择发送D2D发现信号所用的发现资源集合；
在多个发现资源集合中随机选择发送D2D发现信号所用的发现资源集合；
根据UE对应的标识、以及预定的标识与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合；
根据需要发送的D2D发现信号的格式和/或D2D发现信号所携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
再一方面，在确定发送D2D发现信号所用的发现资源集合时，第二确定模块用于根据
UE对应的标识，计算得到所述系统发现资源中能够用于本装置发送D2D发现信号的发现资源，作为发送D2D发现信号所用的发现资源集合。
并且，UE对应的标识包括以下至少之一：
D2D ID、应用ID、C-RNTI、小区ID、簇ID。
又一方面，在确定发送D2D发现信号所用的发现资源集合时，第二确定模块用于根据需要发送的D2D发现信号的格式和/或携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
并且，D2D发现信号的格式包括以下至少之一：
发现序列、发现消息、请求消息或者响应消息。
根据本申请的又一方面，提供了一种UE，该UE包括：
处理器，用于读取存储器中的程序，执行下列过程：确定系统发现资源；确定发送D2D发现信号所用的发现资源集合；通过确定的发现资源集合所对应的物理资源，通过收发机发送D2D发现信号；
收发机，用于在处理器的控制下接收和发送数据；
存储器，用于保存处理器在执行操作时所使用的数据。
其中，系统发现资源可以包括多个发现资源集合。
一方面，在确定系统发现资源时，处理器用于读取存储器中的程序，执行下列过程：确定系统发现资源中包含多个发现资源集合；并且，在确定发送D2D发现信号的发现资源集合时，处理器用于读取存储器中的程序，执行下列过程：从确定的多个发现资源集合中选择发送D2D发现信号所用的发现资源集合。
其中，多个发现资源由基站配置给所述UE、或在所述UE侧预先配置。
另一方面，在确定发送D2D发现信号的发现资源集合时，处理器用于读取存储器中的程序，执行下列过程：确定系统发现资源中的发现资源集合的数目，以及根据发现资源集合的数目和系统发现资源，确定每个发现资源集合所对应的物理资源，并且用于选择发送D2D发现信号所用的发现资源集合。
此外，处理器用于读取存储器中的程序，执行下列过程：根据系统发现资源的大小与发现资源集合的数目之间的映射关系，确定系统发现资源中的发现资源集合的数目；或者，
处理器用于读取存储器中的程序，执行下列过程：根据系统发现资源周期以及发现资源集合的周期，确定系统发现资源中的发现资源集合的数目；或者，
处理器用于读取存储器中的程序，执行下列过程：根据网络侧或者簇头的发现资源集合数目指示信息，确定系统发现资源中的发现资源集合的数目。
并且，映射关系由预先约定得到、或者由网络侧或簇头指示得到。
并且，发现资源集合的周期由预先约定得到、或者由网络侧或簇头指示得到。
此外，在根据发现资源集合的数目和系统发现资源，确定每个发现资源集合所对应的物理资源时，处理器用于读取存储器中的程序，执行下列过程：基于发现资源集合的数目，将每个系统发现资源周期内的系统发现资源平均分配给每个发现资源集合，从而确定每个发现资源集合所对应的物理资源；或者，处理器用于读取存储器中的程序，执行下列过程：根据系统发现资源的周期大小、以及发现资源集合的数目，为不同的发现资源集合选择不同系统发现资源周期内的发现资源，从而确定每个发现资源集合所对应的资源。
并且，处理器用于读取存储器中的程序，执行下列过程：选择发送D2D发现信号所用的发现资源集合的方式包括以下至少之一：
根据网络侧或簇头的指示，选择发送D2D发现信号所用的发现资源集合；
在多个发现资源集合中随机选择发送D2D发现信号所用的发现资源集合；
根据UE对应的标识、以及预定的标识与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合；
根据需要发送的D2D发现信号的格式和/或D2D发现信号所携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
再一方面，在确定发送D2D发现信号所用的发现资源集合时，处理器用于读取存储器中的程序，执行下列过程：根据UE对应的标识，计算得到所述系统发现资源中能够用于本装置发送D2D发现信号的发现资源，作为发送D2D发现信号所用的发现资源集合。
并且，UE对应的标识包括以下至少之一：
D2D ID、应用ID、C-RNTI、小区ID、簇ID。
又一方面，在确定发送D2D发现信号所用的发现资源集合时，处理器用于读取存储器中的程序，执行下列过程：根据需要发送的D2D发现信号的格式和/或携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
并且，D2D发现信号的格式包括以下至少之一：
发现序列、发现消息、请求消息或者响应消息。
本申请通过使UE利用发现资源集合中的物理资源发送D2D发现信号，能够限制终端使用系统发现资源中的部分发现资源发送D2D信号，从而避免大量UE使用相同的资源发送D2D发现信号，克服了同时发送的发现信号过多而导致用户间干扰、影响正常通信的问题。
图1是现有技术中UE之间通过网络进行通信的示意图；
图2是现有技术中UE之间直接通信的示意图；
图3-图5是现有技术中UE之间相互发现的示意图；
图6是系统发现资源的所对应子帧的示意图；
图7是根据本申请实施例的D2D发现信号的发送方法的流程图；
图8和图9是根据本申请实施例的D2D发现信号的发送方案中将系统发现资源划分为不同发现资源集合的示意图；
图10是根据本申请实施例的D2D发现信号的发送装置的框图；
图11是本申请实施例的UE的结构框图；
图12是能够实现根据本申请的技术方案的计算机的结构框图。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本申请保护的范围。
根据本申请的实施例，提供了一种D2D发现信号的发送方法。
如图7所示，该发送方法包括：
步骤S701，UE确定系统发现资源；
步骤S703，UE确定发送D2D发现信号所用的发现资源集合；
步骤S705，UE通过确定的发现资源集合所对应的物理资源，发送D2D发现信号。
其中，系统发现资源可以包括多个发现资源集合，不同发现资源集合所对应的物理资源部分不同或者完全不同。
其中，发现资源集合也称为发现资源池。
下面将分别描述UE确定发送D2D发现信号的发现资源集合的方式。
(方式一)
当系统发现资源包含由基站配置给UE、或在UE侧预先配置的多个发现资源集合时，UE从该多个发现资源集合中选择发送D2D发现信号所用的发现资源集合。
(方式二)
在确定发送D2D发现信号的发现资源集合时，可以首先确定系统发现资源中的发现资源集合的数目；然后根据发现资源集合的数目和系统发现资源，确定每个发现资源集合所
对应的物理资源；接下来，由UE选择发送D2D发现信号所用的发现资源集合。
其中，在确定系统发现资源中的发现资源集合的数目时，可以采用多种方式，例如：
(1)根据系统发现资源的大小与发现资源集合的数目之间的映射关系，确定系统发现资源中的发现资源集合的数目；或者，
(2)根据系统发现资源周期以及发现资源集合的周期，确定系统发现资源中的发现资源集合的数目；或者，
(3)根据网络侧或者簇头的发现资源集合数目指示信息，确定系统发现资源中的发现资源集合的数目。
其中，上述映射关系可以由预先约定得到、或者由网络侧(例如，基站)或簇头指示得到。另外，上述发现资源集合的周期可以由预先约定得到、或者由网络侧(例如，基站)或簇头指示得到。
此外，在根据发现资源集合的数目和系统发现资源，确定每个发现资源集合所对应的物理资源时，可以基于发现资源集合的数目，将每个系统发现资源周期内的系统发现资源平均分配给每个发现资源集合，从而确定每个发现资源集合所对应的物理资源；或者，也可以根据系统发现资源周期大小、以及发现资源集合的数目，为不同的发现资源集合选择不同系统发现资源周期内的发现资源，从而确定每个发现资源集合所对应的资源。
并且，UE选择发送D2D发现信号所用的发现资源集合的处理可以包括以下至少之一：
(a)根据网络侧或簇头的指示，选择发送D2D发现信号所用的发现资源集合；
(b)在多个发现资源集合中随机选择发送D2D发现信号所用的发现资源集合；
(c)根据UE对应的标识、以及预定的标识与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合；
(d)根据需要发送的D2D发现信号的格式和/或D2D发现信号所携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
(方式三)
UE可以根据UE对应的标识，计算得到所述系统发现资源中能够用于该UE发送D2D发现信号的发现资源，作为发送D2D发现信号所用的发现资源集合。
(方式四)
根据需要发送的D2D发现信号的格式和/或携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
在(方式三)和(方式四)中，UE无需根据发现资源集合的数量等信息首先确定所有发现资源集合，而是可以直接得到自身发送D2D发现信号所要使用的发现资源集合。
在以上描述的多个方式中，UE对应的标识可以包括以下至少之一：D2D ID、应用ID、C-RNTI、小区ID、簇ID。另外，D2D发现信号的格式包括以下至少之一：发现序列、发现消息、请求消息或者响应消息。
UE可以用于发送D2D发现信号的发现资源集合的周期大于系统发现资源周期，和/或UE可以用于发送D2D发现信号的发现资源集合在同一周期内的物理资源数量少于系统发现资源在同一周期内的物理资源数量，则不同D2D UE将可能被分在不同的资源中发送发现信号，从而降低发现信号间的干扰，提高发现概率。这样，每个UE都会确定自身发送D2D发现信号所使用的资源，通过对UE发现资源分配的约束，可以使不同UE组使用系统发现资源中的不同区域，降低UE间的干扰，并提高系统整体的发现概率。
下面将详细描述在采用上述(方式二)确定的发现资源集合进行D2D发现信号发送的具体过程，步骤如下：
(1)UE确定系统中用于D2D发现信号发送和接收的系统发现资源；
(2)UE确定系统中的发现资源集合数目，并根据系统中的发现资源集合数目和系统发现资源，确定每个发现资源集合对应的物理资源；
(2.1)发现资源集合是系统发现资源的子集，不同发现资源集合包含的物理资源不完全相同，用以让不同的UE或者UE组在不同的发现资源集合内发送D2D发现信号。
(2.2)一个发现资源集合一般也包括一个子帧集合或者PRB集合，以及该集合出现的周期，该周期大于或者等于系统发现资源周期，如图8所示；
(2.3)UE确定发现资源集合数目的方法包括：
(2.3.1)UE根据预先约定的系统发现资源的大小与发现资源集合数目的映射关系，或者根据基站/簇头指示的系统发现资源的大小与发现资源集合数目的映射关系，确定发现资源集合数目。映射关系可以通过基站/簇头(cluster head)根据当前用户数量，信道环境，发现距离的需求确定。映射关系举例：
(2.3.1a)当发现资源占用的子帧较多时，则采用较大的发现资源集合数目，反之则采用较小的发现资源集合数目，例如可以采用表1所示的对应关系：
表1
(2.3.1b)当发现资源的周期较小时则采用较大的发现资源集合数目，反之则采用较小的发现资源集合数目，例如可以采用表2所示的对应关系：
| 系统发现资源周期 | 发现资源集合数目 |
| 500ms | 1 |
| 1s | 2 |
| 3s | 3 |
(2.3.1c)每个发现资源集合占用的资源数目是固定的，UE根据系统发现资源的大小，以及能够支持的最大发现资源集合数目得到发现资源集合的数目(如果发现资源集合占用的资源数目不能被系统发现资源占用的资源数目整除，可以进行取整操作)；例如，每个发现资源集合固定占用每个系统发现资源周期内的8个子帧，而当前每个系统发现资源周期内一共有32个子帧，可以分配给4个发现资源集合，则相应的发现资源集合的数目为4；
(2.3.2)UE根据系统发现资源周期以及基站或者簇头指示的发现资源集合的周期，确定发现资源集合的数目；例如，发现资源集合的数目可以为N＝T1/T2，其中T1和T2分别为发现资源集合的周期和系统发现资源周期；系统发现资源周期为2s，而各个发现资源集合的发现资源周期均为8s，则可以得到发现资源集合的数目为4；
(2.3.3)UE直接接收基站或者簇头指示的系统中发现资源集合的数目；比如，基站或者簇头通过UE专属的高层信令，或者系统广播的方式，将系统中的发现资源集合数目告知UE。
(2.4)UE可以将系统发现资源平均分配给每个发现资源集合，从而确定每个发现资源集合对应的物理资源；比如，可以将各个系统发现资源周期内的发现资源平均分配给每个发现资源集合，每个发现资源集合的周期与系统发现资源相同，但一个周期内的资源是系统发现资源的子集，参照图8，其中示出了对应发现资源集合A1和A0的子帧以及每个发现资源集合的周期；比如，还可以将各个系统发现资源周期内的发现资源顺序分配给每个发现资源集合(每个周期内的资源只分给一个发现资源集合)，从而每个发现资源集合的周期为系统发现资源的N倍，但一个周期内的资源与系统发现资源相同，参照图9，其中示出了对应发现资源集合A0、A1和A2的子帧以及每个发现资源集合的周期。
(2.5)UE也可以按照发现资源集合的周期和系统发现资源的位置，以及发现资源集合的数目，为不同的发现资源集合选择不同的周期起始位置，从而确定发现资源集合的资源；
(3)UE确定所用的发现资源集合，并在该发现资源集合对应的物理资源上发送D2D发现信号；
UE确定所用发现资源集合的方法包括：
(3.1.1)UE根据基站或者簇头的指示获知所用的发现资源集合；比如通过UE专属的高层信令指示UE所用的发现资源集合索引，或者通过下行控制信令指示(DCI)指示UE所用的发现资源集合索引；
(3.1.2)UE从所有发现资源集合中随机选择一个发现资源集合；UE在每个发现资源
周期内选择的发现资源集合可以相同(即只选择一次)，也可以不同(即每个周期都进行选择)；
(3.1.3)UE根据自身对应的标识，以及约定好的标识与发现资源集合的对应关系，获知自身所用的发现资源集合；
(3.1.3a)比如，UE对应的标识的取值为K，发现资源集合的数目为M，则该UE所用的发现资源集合索引可以表示为：m＝(K mode M)。
(3.1.3b)其中，UE对应的标识可以是UE的D2D ID，相应的应用ID，C-RNTI等可以区分不同UE或者应用的信息，也可以是Cell ID，Cluster ID等可以区分不同小区或者簇的信息，也可以是以上信息的组合。
(3.1.4)UE根据所要发送的D2D发现信号的格式或者所携带的信息，确定发送该D2D发现信号所用的发现资源集合。
(3.2)一般地，在每个发现资源集合的周期内，UE从该发现资源集合对应的物理资源上选择一个或者多个发现资源用于发送D2D发现信号；并在其他时间的系统发现资源上接收其他UE的D2D发现信号；
下面将详细描述在采用上述(方式三)和(方式四)确定的发现资源集合进行D2D发现信号发送的具体过程，步骤如下：
(1)UE确定系统中用于D2D发现信号发送和接收的系统发现资源；
(2)UE从系统发现资源中确定自身发送D2D发现信号所用的发现资源集合，并在确定的发现资源集合内的物理资源上发送D2D发现信号；
(2.1)UE发送D2D发现信号所用的发现资源集合为系统发现资源的子集；
(2.2)UE从系统发现资源中确定自身发送D2D发现信号所用的发现资源集合的方法，包括：
(2.2.1)UE根据自身对应的标识，以及约定好的标识与用于该UE发送D2D发现信号的发现资源索引的对应关系，计算得到所述系统发现资源中可以用于该UE发送D2D发现信号的发现资源，作为自身发送D2D发现信号所用的发现资源集合(对应于上述的方式三)；
(2.2.1a)比如，UE对应的标识的取值为K，则UE将满足以下周期要求的系统发现资源作为自身发送D2D发现信号所用的发现资源集合：m＝(K mode M)或者(m mod M)＝(K mode M)，其中M为预设值或者配置值，m为系统发现资源周期的索引。举例如下：假设M＝2，K为奇数，则m mod M＝(K mode M)＝1，即UE将奇数周期内的系统发现资源作为自身发送D2D发现信号所用的发现资源集合；
(2.2.1b)比如，UE对应的标识的取值为K，则UE将每个系统发现资源周期内满足以下要求的资源索引对应的物理资源作为自身发送D2D发现信号所用的发现资源集合：
m＝(K mode M)或者(m mod M)＝(K mode M)，其中M为预设值或者配置值，m为每个发现资源周期内的子帧或者PRB资源的索引。举例如下：假设M＝2，K为偶数，则m＝(K mode M)＝0，即UE将第0个子帧或者第0个PRB作为自身发送D2D发现信号所用的发现资源集合；
(2.2.1c)UE对应的标识可以是UE的D2D ID，相应的应用ID，C-RNTI等可以区分不同UE或者应用的信息，也可以是Cell ID，Cluster ID等可以区分不同小区或者簇的信息，也可以是以上信息的组合。
(2.2.2)UE根据所要发送的D2D发现信号的格式或者所携带的信息，确定发送该D2D发现信号所用的发现资源集合(对应于上述的方式四)。其中D2D发现信号的格式包括但不限于发现序列、发现消息、请求消息或者响应消息；D2D发现信号所携带的信息内容包括D2D ID，应用ID，UE类型等。例如，当UE发送发现序列、发现消息、请求消息和响应消息时，可以分别采用三个不同的发现资源集合进行发送，不同的D2D发现信号格式对应的发现资源集合可以通过预先配置得到。
(2.3)一般地，在每个发现资源集合的周期内，UE从该发现资源集合对应的物理资源上选择一个或者多个发现资源用于发送D2D发现信号；并在其他时间的发现资源上接收其他UE的D2D发现信号。
下面将结合具体的实例，详细描述本申请的技术方案。
实例1
假设UE在基站的覆盖范围内，且为D2D UE。
(1)UE接收基站的SIB广播，通过广播中的发现资源指示域获知系统中用于D2D发现信号发送和接收的系统发现资源。其中，发现资源指示域包括用于D2D发现信号发送的发现资源指示信息和用于D2D发现信号接收的发现资源指示信息，用于D2D发现信号发送的发现资源指示信息包含了若干个发现资源集合的指示信息，每个发现资源集合的指示信息都包含其发现资源周期内的子帧索引和各自的发现资源周期。具体的，假设当前指示信息指示了三个发现资源集合用于D2D发现信号的发送；
(2)UE接收基站的SIB广播，通过广播中的发现资源集合指示域获知系统中用于D2D发现信号发送的三个发现资源集合；
(3)UE从三个发现资源集合中随机选择一个发现资源集合，固定采用该发现资源集合对应的物理资源来作为D2D发现信号的发送资源；假设UE选择的发现资源集合为发现资源集合0；
(4)在发现资源集合0的每个周期内，UE从发现资源集合0对应的物理资源上选择一个或者多个发现资源用于发送D2D发现信号。
实例2
假设UE在基站的覆盖范围内，且为D2D UE。
(1)UE接收基站的SIB广播，通过广播中的发现资源指示域获知系统中用于D2D发现信号发送和接收的系统发现资源。其中，发现资源指示域包括用于D2D发现信号发送的发现资源指示信息和用于D2D发现信号接收的发现资源指示信息，用于D2D发现信号发送的发现资源指示信息包含了系统发现资源周期内的子帧索引和相应的系统发现资源周期。具体的，假设目前UE所在小区所用的系统发现资源子帧索引为0-2，且周期为1s；
(2)UE接收基站的SIB广播，通过广播中的发现资源集合指示域获知系统中的发现资源集合数目；例如，基站通过2比特的信令来指示发现资源集合数目，且当前指示的数目为2；
(3)UE按照约定的发现资源集合资源分配方式，将各个系统发现资源周期内的发现资源顺序分配给每个发现资源集合(每个周期内的资源只分给一个发现资源集合，各发现资源集合轮流分配)，从而每个发现资源集合的周期为系统发现资源的2倍，但一个周期内的资源与系统发现资源相同，如图9所示。发现资源集合0占用奇数周期的资源，发现资源集合1占用偶数周期的资源。
(4)UE从2个发现资源集合中随机选择一个发现资源集合，固定采用该发现资源集合对应的物理资源来作为D2D发现信号的发送资源；假设UE选择的发现资源集合为发现资源集合0；
(5)在发现资源集合0的每个周期内(周期为2s)，UE从发现资源集合0对应的物理资源上(子帧索引为0-2)选择一个或者多个发现资源用于发送D2D发现信号，并在系统发现资源的其他子帧上检测其他UE的D2D发现信号。
实例3
假设UE在基站的覆盖范围内，且为D2D UE。
(1)UE接收基站发送的UE专属的高层信令，获知系统中用于D2D发现信号发送和接收的系统发现资源。其中，发现资源指示域包括用于D2D发现信号发送的发现资源指示信息和用于D2D发现信号接收的发现资源指示信息，用于D2D发现信号发送的发现资源指示信息包含了系统发现资源周期内的子帧索引和相应的系统发现资源周期。具体的，假设目前UE所在小区所用的系统发现资源子帧索引为0-2，且周期为T2＝1s；
(2)UE接收基站发送的UE专属的高层信令，获知系统中的发现资源集合的周期；例如，基站通过若干比特的信令来指示发现资源集合的周期，且当前指示的周期为T1＝2s；
(3)UE根据系统发现资源周期以及发现资源集合的周期，确定发现资源集合的数目：发现资源集合的数目为N＝T1/T2＝2；
(4)UE根据系统发现资源的位置以及发现资源集合的周期，为两个发现资源集合选择不同的资源起始位置，从而使每个发现资源集合周期内的资源与系统发现资源相同，如
图8所示。发现资源集合0占用奇数周期的资源，发现资源集合1占用偶数周期的资源；
(5)UE根据自身的D2D ID，从两个发现资源集合中选择一个发现资源集合，固定采用该发现资源集合对应的物理资源来作为D2D发现信号的发送资源；其中发现资源集合索引与D2D ID的对应关系为M＝(K mode 2)，M为发现资源集合索引，K为UE的D2D ID，假设UE选择的发现资源集合为发现资源集合0；
(6)在发现资源集合0的每个周期内(周期为2s)，UE从发现资源集合0对应的物理资源上(子帧索引为0-2)选择一个或者多个发现资源用于发送D2D发现信号，并在系统发现资源的其他子帧上检测其他UE的D2D发现信号。
实例4
假设UE在基站的覆盖范围外，且为D2D UE。
(1)UE根据预先配置的资源，确定系统中用于D2D发现信号发送和接收的系统发现资源；假设预先配置的系统发现资源子帧索引为0-2，且周期为T2＝1s；
(2)UE接收簇头的发现资源集合指示信息，获知系统中的发现资源集合数目为3，该信息通过SIB广播发送；
(3)UE按照约定的资源分配方式，将各个系统发现资源周期内的发现资源平均分配给每个发现资源集合，每个发现资源集合的周期与系统发现资源相同，但一个周期内的资源是系统发现资源的子集，如图8所示，每个发现资源集合占用一个系统发现资源周期内的不同发现子帧；
(4)在每个发现资源集合的周期内(周期为1s)，UE从3个发现资源集合中随机选择一个发现资源集合，采用该发现资源集合对应的物理资源来作为D2D发现信号的发送资源；
(5)在每个发现资源集合的周期内(周期为1s)，UE从所选择的发现资源集合对应的物理资源上选择一个或者多个发现资源用于发送D2D发现信号，并在该周期内的其他子帧的发现资源上检测其他UE的D2D发现信号；例如，在某个发现资源集合周期内UE选择的发现资源集合为1，则UE从子帧索引1对应的子帧内选择一个发现资源用于发送D2D发现信号，并在子帧0和2上检测其他UE的D2D发现信号。
实例5
(1)UE接收基站的高层信令指示，获知系统中用于D2D发现信号发送和接收的系统发现资源。其中，发现资源指示域包括用于D2D发现信号发送的发现资源指示信息和用于D2D发现信号接收的发现资源指示信息，用于D2D发现信号发送的发现资源指示信息包含了系统发现资源周期内的子帧索引和相应的系统发现资源周期。具体的，假设目前UE所在小区所用的系统发现资源子帧索引为0-2，且周期为T2＝1s；
(2)UE根据所在服务小区的Cell ID以及自身的D2D ID，从系统发现资源中选择一
部分资源作为自身发送D2D发现信号的发现资源集合。选择的方法如下：
(2.1)首先用Cell ID确定所述发现资源集合包含哪些周期内的系统发现资源，即将满足以下周期要求的系统发现资源作为候选的发现资源集合：(m mod M)＝(Cell ID mode M)，其中M＝所述发现资源集合的周期/系统发现资源周期，m为系统发现资源周期的索引。
(2.2)再用D2D ID确定之前得到的候选发现资源集合中，哪些资源可以作为自身发送D2D发现信号的发现资源；即在每个发现资源集合周期内，选择满足(k mod K)＝(D2D ID mode K)的资源索引对应的物理资源作为目标发现资源集合，k为资源索引，K为预设值；
(3)在每个发现资源集合的周期内，UE从所确定的发现资源集合内选择一个或者多个发现资源用于发送D2D发现信号，并在该周期内的其他子帧的发现资源上检测其他UE的D2D发现信号。
应当注意，图8、图9、表1、表2以及以上描述多个实例仅仅用于说明，本申请可以配置数量更多、子帧分布情况更复杂的发现资源集合，具体情况本文不再一一列举。
根据以上具体实施例，不难看出，根据本申请技术方案提供的D2D发现信号的发送方法能够对发现资源分为不同的集合，借助于这种资源配置的方法，可以根据系统发现资源大小进行不同的发现资源分组，通过对UE发现资源分配的约束，使不同UE组使用系统发现资源中的不同区域，降低UE间的干扰，并提高系统整体的发现概率，例如，能够在系统发现资源较少时，避免UE间干扰，并且不会明显提高UE的发现时延。
根据本申请的实施例，还提供了一种D2D发现信号的发送装置。
如图10所示，该发送装置包括：
第一确定模块101，用于确定系统发现资源；
第二确定模块102，用于确定发送D2D发现信号所用的发现资源集合；
发送模块103，用于通过确定的发现资源集合所对应的物理资源，发送D2D发现信号。
其中，系统发现资源可以包括多个发现资源集合。
其中，一方面，在确定系统发现资源时，第一确定模块101用于确定系统发现资源中包含多个发现资源集合；并且，在确定发送D2D发现信号的发现资源集合时，第二确定模块102用于从确定的多个发现资源集合中选择发送D2D发现信号所用的发现资源集合。
其中，多个发现资源由基站配置给所述装置、或在所述装置侧预先配置。
另一方面，在确定发送D2D发现信号的发现资源集合时，第二确定模块102还用于确定系统发现资源中的发现资源集合的数目，以及根据发现资源集合的数目和系统发现资源，确定每个发现资源集合所对应的物理资源，并且用于选择发送D2D发现信号所用的发现资源集合。
并且，第二确定模块102还用于根据系统发现资源的大小与发现资源集合的数目之间
的映射关系，确定系统发现资源中的发现资源集合的数目；或者，
第二确定模块102用于根据系统发现资源周期以及发现资源集合的周期，确定系统发现资源中的发现资源集合的数目；或者，
第二确定模块102用于根据网络侧或者簇头的发现资源集合数目指示信息，确定系统发现资源中的发现资源集合的数目。
其中，映射关系可以由预先约定得到、或者由网络侧或簇头指示得到。
并且，发现资源集合的周期由预先约定得到、或者由网络侧或簇头指示得到。
并且，在根据发现资源集合的数目和系统发现资源，确定每个发现资源集合所对应的物理资源时，第二确定模块102还用于基于发现资源集合的数目，将每个系统发现资源周期内的系统发现资源平均分配给每个发现资源集合，从而确定每个发现资源集合所对应的物理资源；或者，第二确定模块102用于根据系统发现资源的周期大小、以及发现资源集合的数目，为不同的发现资源集合选择不同系统发现资源周期内的发现资源，从而确定每个发现资源集合所对应的资源。
并且，第二确定模块102选择发送D2D发现信号所用的发现资源集合的方式可以包括以下至少之一：
根据网络侧或簇头的指示，选择发送D2D发现信号所用的发现资源集合；
在多个发现资源集合中随机选择发送D2D发现信号所用的发现资源集合；
根据UE对应的标识、以及预定的标识与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合；
根据需要发送的D2D发现信号的格式和/或D2D发现信号所携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
再一方面，在确定发送D2D发现信号所用的发现资源集合时，第二确定模块102还用于根据UE对应的标识，计算得到所述系统发现资源中能够用于本装置发送D2D发现信号的发现资源，作为发送D2D发现信号所用的发现资源集合(对应于上述方式二)。
其中，UE对应的标识包括以下至少之一：
D2D ID、应用ID、C-RNTI、小区ID、簇ID。
又一方面，在确定发送D2D发现信号所用的发现资源集合时，第二确定模块102还用于根据需要发送的D2D发现信号的格式和/或携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合(对应于上述方式三)。
其中，D2D发现信号的格式包括以下至少之一：
发现序列、发现消息、请求消息或者响应消息。
根据本申请实施例，还提供一种UE，如图11所示，该UE包括：
处理器1101，用于读取存储器1103中的程序，执行下列过程：确定系统发现资源；确定发送D2D发现信号所用的发现资源集合；通过确定的发现资源集合所对应的物理资源，通过收发机1101发送D2D发现信号；
收发机1103，用于在处理器1101的控制下接收和发送数据。
其中，在图11中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器1101代表的一个或多个处理器和存储器1103代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机1102可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户设备，用户接口1104还可以是能够外接内接需要设备的接口，连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。
处理器1101负责管理总线架构和通常的处理，存储器1103可以存储处理器1101在执行操作时所使用的数据。
综上所述，借助于本申请的上述技术方案，能够限制终端使用系统发现资源中的部分发现资源发送D2D信号，从而避免大量UE使用相同的资源发送D2D发现信号，克服了同时发送的发现信号过多而导致用户间干扰、影响正常通信的问题，提高了UE之间相互发现的性能。
以上结合具体实施例描述了本申请的基本原理，但是，需要指出的是，对本领域的普通技术人员而言，能够理解本申请的方法和装置的全部或者任何步骤或者部件，可以在任何计算装置(包括处理器、存储介质等)或者计算装置的网络中，以硬件、固件、软件或者它们的组合加以实现，这是本领域普通技术人员在阅读了本申请的说明的情况下运用它们的基本编程技能就能实现的。
因此，本申请的目的还可以通过在任何计算装置上运行一个程序或者一组程序来实现。所述计算装置可以是公知的通用装置。因此，本申请的目的也可以仅仅通过提供包含实现所述方法或者装置的程序代码的程序产品来实现。也就是说，这样的程序产品也构成本申请，并且存储有这样的程序产品的存储介质也构成本申请。显然，所述存储介质可以是任何公知的存储介质或者将来所开发出来的任何存储介质。
根据本申请的另一实施例，还提供了一种存储介质(该存储介质可以是ROM、RAM、硬盘、可拆卸存储器等)，该存储介质中嵌入有用于发送D2D发现信号的计算机程序，该计算机程序具有被配置用于执行以下步骤的代码段：确定系统发现资源；确定UE发送D2D发现信号所用的发现资源集合；通过确定的发现资源集合所对应的物理资源，发送D2D发现信号。
根据本申请的另一实施例，还提供了一种计算机程序，该计算机程序具有被配置用于执行以下D2D发现信号发送步骤的代码段：确定系统发现资源；确定UE发送D2D发现信号所用的发现资源集合；通过确定的发现资源集合所对应的物理资源，发送D2D发现信号。
在通过软件和/或固件实现本申请的实施例的情况下，从存储介质或网络向具有专用硬件结构的计算机，例如图11所示的通用计算机1100安装构成该软件的程序，该计算机在安装有各种程序时，能够执行各种功能等等。
在图12中，中央处理模块(CPU)1201根据只读存储器(ROM)1202中存储的程序或从存储部分1208加载到随机存取存储器(RAM)1203的程序执行各种处理。在RAM 1203中，也根据需要存储当CPU 1201执行各种处理等等时所需的数据。CPU 1201、ROM 1202和RAM 1203经由总线1204彼此连接。输入/输出接口1205也连接到总线1204。
下述部件连接到输入/输出接口1205：输入部分1206，包括键盘、鼠标等等；输出部分1207，包括显示器，比如阴极射线管(CRT)、液晶显示器(LCD)等等，和扬声器等等；存储部分1208，包括硬盘等等；和通信部分1209，包括网络接口卡比如LAN卡、调制解调器等等。通信部分1209经由网络比如因特网执行通信处理。
根据需要，驱动器1210也连接到输入/输出接口1205。可拆卸介质1211比如磁盘、光盘、磁光盘、半导体存储器等等根据需要被安装在驱动器1210上，使得从中读出的计算机程序根据需要被安装到存储部分1208中。
在通过软件实现上述系列处理的情况下，从网络比如因特网或存储介质比如可拆卸介质1211安装构成软件的程序。
本领域的技术人员应当理解，这种存储介质不局限于图12所示的其中存储有程序、与装置相分离地分发以向用户提供程序的可拆卸介质1211。可拆卸介质1211的例子包含磁盘(包含软盘(注册商标))、光盘(包含光盘只读存储器(CD-ROM)和数字通用盘(DVD))、磁光盘(包含迷你盘(MD)(注册商标))和半导体存储器。或者，存储介质可以是ROM 1202、存储部分1208中包含的硬盘等等，其中存有程序，并且与包含它们的装置一起被分发给用户。
还需要指出的是，在本申请的装置和方法中，显然，各部件或各步骤是可以分解和/或重新组合的。这些分解和/或重新组合应视为本申请的等效方案。并且，执行上述系列处理的步骤可以自然地按照说明的顺序按时间顺序执行，但是并不需要一定按照时间顺序执行。某些步骤可以并行或彼此独立地执行。
虽然已经详细说明了本申请及其有点，但是应当理解在不脱离由所附的权利要求所限定的本申请的精神和范围的情况下可以进行各种改变、替代和变换。而且，本申请的术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要
素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者装置中还存在另外的相同要素。
Claims (30)
- 一种D2D发现信号的发送方法，其特征在于，包括：UE确定系统发现资源；所述UE确定发送D2D发现信号所用的发现资源集合；所述UE通过确定的所述发现资源集合所对应的物理资源，发送D2D发现信号。
- 根据权利要求1所述的发送方法，其特征在于，UE确定系统发现资源包括：UE确定系统发现资源中包含的多个发现资源集合；并且，所述UE确定发送D2D发现信号的发现资源集合包括：所述UE从确定的所述多个发现资源集合中选择发送D2D发现信号所用的发现资源集合。
- 根据权利要2所述的发送方法，其特征在于，所述多个发现资源集合由基站配置给UE、或在UE侧预先配置。
- 根据权利要求1所述的发送方法，其特征在于，所述UE确定发送D2D发现信号的发现资源集合包括：确定所述系统发现资源中的发现资源集合的数目；根据发现资源集合的数目和所述系统发现资源，确定每个发现资源集合所对应的物理资源；所述UE选择发送D2D发现信号所用的发现资源集合。
- 根据权要求4所述的发送方法，其特征在于，确定所述系统发现资源中的发现资源集合的数目包括：根据所述系统发现资源的大小与发现资源集合的数目之间的映射关系，确定所述系统发现资源中的发现资源集合的数目；或者，根据所述系统发现资源周期以及发现资源集合的周期，确定所述系统发现资源中的发现资源集合的数目；或者，根据网络侧或者簇头的发现资源集合数目指示信息，确定所述系统发现资源中的发现资源集合的数目。
- 根据权利要求5所述的发送方法，其特征在于，所述映射关系由预先约定得到、或者由网络侧或簇头指示得到。
- 根据权利要求5所述的发送方法，其特征在于，所述发现资源集合的周期由预先约定得到、或者由网络侧或簇头指示得到。
- 根据权利要求4所述的发送方法，其特征在于，根据发现资源集合的数目和所述系统发现资源，确定每个发现资源集合所对应的物理资源包括：基于发现资源集合的数目，将每个系统发现资源周期内的系统发现资源平均分配给每个发现资源集合，从而确定每个发现资源集合所对应的物理资源；或者根据系统发现资源周期大小、以及发现资源集合的数目，为不同的发现资源集合选择不同系统发现资源周期内的发现资源，从而确定每个发现资源集合所对应的资源。
- 根据权利要求2或4所述的发送方法，其特征在于，所述UE选择发送D2D发现信号所用的发现资源集合包括以下至少之一：根据网络侧或簇头的指示，选择所述UE发送D2D发现信号所用的发现资源集合；在多个发现资源集合中随机选择所述UE发送D2D发现信号所用的发现资源集合；根据所述UE对应的标识、以及预定的标识与发现资源集合之间的对应关系，选择所述UE发送D2D发现信号所用的发现资源集合；根据需要发送的D2D发现信号的格式和/或所述D2D发现信号所携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择所述UE发送D2D发现信号所用的发现资源集合。
- 根据权利要求1所述的发送方法，其特征在于，所述UE确定发送D2D发现信号所用的发现资源集合包括：根据所述UE对应的标识，计算得到所述系统发现资源中能够用于该UE发送D2D发现信号的发现资源，作为发送D2D发现信号所用的发现资源集合。
- 根据权利要求9所述的发送方法，其特征在于，所述UE对应的标识包括以下至少之一：D2D ID、应用ID、C-RNTI、小区ID、簇ID。
- 根据权利要求9所述的发送方法，其特征在于，所述UE对应的标识包括以下至少之一：D2D ID、应用ID、C-RNTI、小区ID、簇ID。
- 根据权利要求1所述的发送方法，其特征在于，所述UE确定发送D2D发现信号所用的发现资源集合包括：根据需要发送的D2D发现信号的格式和/或携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
- 根据权利要求9所述的发送方法，其特征在于，D2D发现信号的格式包括以下至少之一：发现序列、发现消息、请求消息或者响应消息。
- 根据权利要求13所述的发送方法，其特征在于，D2D发现信号的格式包括以 下至少之一：发现序列、发现消息、请求消息或者响应消息。
- 一种D2D发现信号的发送装置，其特征在于，包括：第一确定模块，用于确定系统发现资源；第二确定模块，用于确定发送D2D发现信号所用的发现资源集合；发送模块，用于通过确定的所述发现资源集合所对应的物理资源，发送D2D发现信号。
- 根据权利要求16所述的发送装置，其特征在于，在确定系统发现资源时，所述第一确定模块用于确定系统发现资源中包含的多个发现资源集合；并且，在确定发送D2D发现信号的发现资源集合时，所述第二确定模块用于从确定的所述多个发现资源集合中选择发送D2D发现信号所用的发现资源集合。
- 根据权利要求17所述的发送装置，其特征在于，所述多个发现资源由基站配置给所述装置、或在所述装置侧预先配置。
- 根据权利要求16所述的发送装置，其特征在于，在确定发送D2D发现信号的发现资源集合时，所述第二确定模块用于确定所述系统发现资源中的发现资源集合的数目，以及根据发现资源集合的数目和所述系统发现资源，确定每个发现资源集合所对应的物理资源，并且用于选择发送D2D发现信号所用的发现资源集合。
- 根据权要求19所述的发送装置，其特征在于，所述第二确定模块用于根据所述系统发现资源的大小与发现资源集合的数目之间的映射关系，确定所述系统发现资源中的发现资源集合的数目；或者，所述第二确定模块用于根据所述系统发现资源周期以及发现资源集合的周期，确定所述系统发现资源中的发现资源集合的数目；或者，所述第二确定模块用于根据网络侧或者簇头的发现资源集合数目指示信息，确定所述系统发现资源中的发现资源集合的数目。
- 根据权利要求20所述的发送装置，其特征在于，所述映射关系由预先约定得到、或者由网络侧或簇头指示得到。
- 根据权利要求20所述的发送装置，其特征在于，所述发现资源集合的周期由预先约定得到、或者由网络侧或簇头指示得到。
- 根据权利要求19所述的发送装置，其特征在于，在根据发现资源集合的数目和所述系统发现资源，确定每个发现资源集合所对应的物理资源时，所述第二确定模块用于基于发现资源集合的数目，将每个系统发现资源周期内的系统发现资源平均分配给每个发现资源集合，从而确定每个发现资源集合所对应的物理资源；或者，所述第二确定模块用于根据系统发现资源周期大小、以及发现资源集合的数目，为不同的 发现资源集合选择不同系统发现资源周期内的发现资源，从而确定每个发现资源集合所对应的资源。
- 根据权利要求13或19所述的发送装置，其特征在于，所述第二确定模块选择发送D2D发现信号所用的发现资源集合的方式包括以下至少之一：根据网络侧或簇头的指示，选择发送D2D发现信号所用的发现资源集合；在多个发现资源集合中随机选择发送D2D发现信号所用的发现资源集合；根据所述UE对应的标识、以及预定的标识与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合；根据需要发送的D2D发现信号的格式和/或所述D2D发现信号所携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
- 根据权利要求16所述的发送装置，其特征在于，在确定发送D2D发现信号所用的发现资源集合时，所述第二确定模块用于根据UE对应的标识，计算得到所述系统发现资源中能够用于所述装置发送D2D发现信号的发现资源，作为发送D2D发现信号所用的发现资源集合。
- 根据权利要求24所述的发送装置，其特征在于，所述UE对应的标识包括以下至少之一：D2D ID、应用ID、C-RNTI、小区ID、簇ID。
- 根据权利要求25所述的发送装置，其特征在于，所述UE对应的标识包括以下至少之一：D2D ID、应用ID、C-RNTI、小区ID、簇ID。
- 根据权利要求16所述的发送装置，其特征在于，在确定发送D2D发现信号所用的发现资源集合时，所述第二确定模块用于根据需要发送的D2D发现信号的格式和/或携带的信息、以及预先约定的D2D发现信号的格式和/或携带的信息与发现资源集合之间的对应关系，选择发送D2D发现信号所用的发现资源集合。
- 根据权利要求24所述的发送装置，其特征在于，D2D发现信号的格式包括以下至少之一：发现序列、发现消息、请求消息或者响应消息。
- 根据权利要求28所述的发送装置，其特征在于，D2D发现信号的格式包括以下至少之一：发现序列、发现消息、请求消息或者响应消息。
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| KR1020167011827A KR101813822B1 (ko) | 2013-11-08 | 2014-11-06 | D2d 발견 신호의 송신 방법과 송신 장치 |
| EP14860618.9A EP3068172A4 (en) | 2013-11-08 | 2014-11-06 | METHOD AND DEVICE FOR SENDING D2D SEARCH SIGNAL |
| JP2016528188A JP6300918B2 (ja) | 2013-11-08 | 2014-11-06 | Ｄ２ｄ発見信号の送信方法及び送信装置 |
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| CN201410076858.6 | 2014-03-04 |
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| CN (1) | CN104640172A (zh) |
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| US10517119B2 (en) * | 2014-09-25 | 2019-12-24 | Intel IP Corporation | Apparatuses, systems, and methods for probabilistic transmission of device-to-device (D2D) discovery messages |
| JP6533085B2 (ja) * | 2015-03-31 | 2019-06-19 | Ｌｉｎｅ株式会社 | 端末、情報処理方法、及びプログラム |
| US20170048036A1 (en) * | 2015-08-10 | 2017-02-16 | Qualcomm Incorporated | Extending lte-d discovery for v2v |
| KR102430874B1 (ko) * | 2015-11-25 | 2022-08-09 | 삼성전자주식회사 | 위치를 측정하기 위한 장치 및 방법 |
| WO2018201405A1 (zh) * | 2017-05-04 | 2018-11-08 | Oppo广东移动通信有限公司 | 数据的收发方法及相关产品 |
| US11191059B2 (en) | 2017-08-04 | 2021-11-30 | Lg Electronics Inc. | Method by which terminal simultaneously transmits messages in at least two carriers in wireless communication system supporting device to device communication, and apparatus therefor |
| US11716707B2 (en) | 2017-08-11 | 2023-08-01 | Lg Electronics Inc. | Method by which terminal simultaneously transmits messages in at least two carriers in wireless communication system supporting device to device communication, and apparatus therefor |
| CN111107517B (zh) * | 2019-12-31 | 2022-02-11 | 北京紫光展锐通信技术有限公司 | 通信资源的配置方法、装置、终端及可读存储介质 |
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- 2014-11-06 JP JP2016528188A patent/JP6300918B2/ja active Active
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| TWI556678B (zh) | 2016-11-01 |
| JP2016539568A (ja) | 2016-12-15 |
| EP3068172A4 (en) | 2016-10-19 |
| US20160278068A1 (en) | 2016-09-22 |
| TW201519690A (zh) | 2015-05-16 |
| EP3068172A1 (en) | 2016-09-14 |
| KR101813822B1 (ko) | 2017-12-29 |
| KR20160068844A (ko) | 2016-06-15 |
| JP6300918B2 (ja) | 2018-03-28 |
| CN104640172A (zh) | 2015-05-20 |
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