TW201448641A - Method and device for detecting discovery signal - Google Patents

Abstract

Embodiments of present invention disclose a method and device for detecting a discovery signal, and relate to the field of wireless communications, and are used to solve a problem that how to detect the discovery signal of a discovered User Equipment (UE) by a discovering UE when the discovering UE and the discovered UE belong to two asynchronous cells or the discovering UE and the discovered UE are out of network coverage. In this solution, when the discovering UE and the discovered UE belong to two asynchronous cells or the discovering UE and the discovered UE are out of network coverage, the discovering UE can obtain transmission timing information of the discovery signal for the discovered UE by detecting a synchronous signal of the cell which the discovered UE belongs to, then determine, according to the transmission timing information of the discovery signal, physical resources used by the discovered UE for transmitting the discovery signal, and detect the discovery signal transmitted by the discovered UE on the physical resources, thus solving the problem of how to detect the discovery signal for the discovered UE by the discovering UE.

Description

Discovery signal detection method and device

The invention belongs to the field of wireless communication, and in particular relates to a method and device for detecting a signal.

In the traditional cellular communication technology, the data communication process between two user equipments (User Equipments, UEs) is as shown in FIG. 1 . Services such as voice and data of the two UEs interact through the Evolved Node B (eNB) and the core network where they reside.

Device-to-device (D2D), that is, UE direct-through technology, refers to a method in which neighboring UEs can transmit data through a direct link in a short-range range without passing through a central node (ie, a base station). Forward, as shown in Figure 2. The short-distance communication characteristics and direct communication mode of D2D technology have the following advantages: UE short-distance direct communication can achieve higher data rate, lower delay and lower power consumption; The short-distance characteristics of the UE and the D2D communication link can realize the effective utilization of the spectrum resources; the direct communication mode of the D2D can adapt to the local data sharing requirements of services such as wireless peer-to-peer (P2P), and provide flexible adaptability. Data services; D2D direct communication can take advantage of the large number of widely distributed UEs in the network to extend the coverage of the network.

Long Term Evolution (LTE) D2D technology refers to the D2D discovery and communication process controlled by the LTE network operating on the LTE licensed frequency band. On the one hand In order to give full play to the advantages of D2D technology, the control of LTE network can also overcome some problems of traditional 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 discovery between the D2D user equipment (UE) is realized by the discovery signal, and the discovery signal can carry certain identification information, such as device information, application information, service type, etc., and the UE is found to identify the discovered UE through the information. The discovery signal is generally transmitted in a dedicated discovery subframe, and the discovery signals of different UEs may occupy different frequency domain resources. When there is network coverage, the discovery resource can be scheduled by the base station, for example, which subframes are configured to discover the subframe, and which frequency domain resources can be used to transmit the discovery signal. When there is no network coverage, the sub-frame and frequency domain resources are generally predefined. The discovery signal needs to be guaranteed to be found within the coverage of the LTE network, and it is also necessary to ensure that there is no network coverage.

Figures 3 through 5 show three typical discovery scenarios: intra-cell discovery, inter-cell discovery, and no network coverage discovery. For the situation found in the cell, the UE obtains synchronization with the network side, and the UE can acquire mutual synchronization according to the synchronization with the network side to perform mutual discovery on the synchronized discovery resources, and discover that the used resources can also be Obtained on the network side. For the case of inter-cell discovery, since the two cells may be asynchronous, if they are synchronized with the network side, the two UEs may be out of synchronization and cannot be directly discovered, and the UE may not know. Discovery resources used by neighboring cells. For the case of no network, the UEs are also asynchronous, and need to be synchronized first to discover. Generally, in the case of no network, there is a cluster header in a cluster adjacent to each other to transmit a synchronization signal, so that surrounding UEs can synchronize with each other to perform mutual discovery. Here, the role of the cluster head in synchronization is similar to that of the base station when there is network coverage.

In summary, in the inter-cell mutual discovery scenario when there is network coverage, if the neighboring cells are not synchronized, the UEs belonging to different cells cannot obtain synchronization with each other through synchronization with the network side, and thus different cells The UE cannot detect each other's discovery signals. No network overwrite When the cover is used, the UEs in different clusters are also asynchronous, so UEs in different clusters cannot detect each other's discovery signals.

An embodiment of the present invention provides a method and a device for detecting a discovery signal, which are used to find out how to detect a UE when the UE and the discovered UE are not synchronized, or when the UE is found to be in the network coverage. The problem of the UE's discovery signal was found.

A discovery signal detection method, the method comprising: detecting that a UE detects a synchronization signal of a neighboring area, where the neighboring area is a neighboring cell or a neighboring cluster; and discovering that the UE selects a destination area from the neighboring areas corresponding to the detected synchronization signals; Determining the physical resource information used by the UE in each destination area to send the discovery signal; and finding that the UE determines the discovery signal transmission timing information of the UE in the destination area according to the downlink synchronization timing information of the destination area for each destination area. And determining the discovery signal sending timing information and the physical resource corresponding to the physical resource information used by the UE in the destination area to send the discovery signal, and detecting the discovery signal sent by the UE on the physical resource.

A UE, the UE includes: a synchronization signal detecting unit, configured to detect a synchronization signal of a neighboring area, where the neighboring area is a neighboring cell or a neighboring cluster; and a destination area selecting unit, configured to use the neighboring area corresponding to each detected synchronization signal Selecting a destination area; a physical resource determining unit, configured to determine physical resource information used by the UE in each destination area to send a discovery signal; and a discovery signal detecting unit for each destination area according to the destination area Downlink synchronization timing information determines a discovery signal transmission timing of the UE in the destination area And determining, by the information, the physical resource corresponding to the physical resource information used by the UE in the destination area to send the discovery signal, and detecting the discovery signal sent by the UE on the physical resource.

In the solution provided by the embodiment of the present invention, the UE is found to detect the synchronization signal of the neighboring area, and all or part of the neighboring area is selected as the destination area from the detected neighboring areas of each synchronization signal, and the UE in each destination area is determined to be sent. And discovering, by using the downlink synchronization timing information of the destination area, the discovery signal transmission timing information of the UE in the destination area, determining the discovery signal transmission timing information and the purpose for each destination area. The UE in the local area transmits a physical resource corresponding to the physical resource information used by the discovery signal, and detects, on the physical resource, a discovery signal sent by the UE in the destination area, that is, the discovered UE. With the present scheme, when the UE and the discovered UE belong to two cells that are not synchronized or the UE is found to be in the network coverage, the UE is found to be able to obtain the discovered UE by detecting the synchronization signal of the cell where the UE is found. The discovery signal sends timing information, and then determines the physical resource used by the discovered UE to send the discovery signal according to the discovery signal transmission timing information, and detects the discovery signal sent by the discovered UE on the physical resource, so that the solution solves the discovery of the UE. And when the two cells that are found to be unsynchronized by the UE or the UE and the discovered UE are not within the network coverage, the UE is found to detect the discovery signal of the discovered UE.

60~63‧‧‧Steps

80‧‧‧Synchronous signal detection unit

81‧‧‧Destination area selection unit

82‧‧‧Physical resource determination unit

83‧‧‧ Discovery signal detection unit

91‧‧‧ memory

92‧‧‧ processor

1 is a schematic diagram of a data flow of UE communication in a cellular network in the prior art; FIG. 2 is a schematic diagram of a data flow of UE direct communication in the prior art; FIG. 3 is a schematic diagram of UE discovery in a cell in the prior art; 4 is a schematic diagram of inter-cell UE discovery in the prior art; FIG. 5 is a schematic diagram of UE discovery without network coverage in the prior art; FIG. 6 is a schematic flowchart of a method according to an embodiment of the present invention; FIG. Schematic diagram of physical resources used by discovery signals of UEs of different cells; FIG. 8 is a schematic structural diagram of a device according to an embodiment of the present invention; and FIG. 9 is a schematic structural diagram of a UE according to an embodiment of the present invention.

In order to solve the problem of how to detect the discovery signal of the discovered UE when the UE is found to be unsynchronized or the UE is found to be out of synchronization, and the UE is found to be in the network coverage, the embodiment of the present invention provides a Discover signal detection methods.

Referring to FIG. 6, a method for detecting a discovery signal according to an embodiment of the present invention includes the following steps:

Step 60: The UE detects the synchronization signal of the neighboring area, where the neighboring area is a neighboring cell or a neighboring cluster. Here, the synchronization signal may include a Primary Synchronized Signal (PSS) and a Secondary Synchronization Signal (SSS). When the neighboring cell is a neighboring cell, the synchronization signal of the neighboring cell is sent by the base station of the neighboring cell. When the neighboring cell is adjacent to the cluster, the synchronization signal of the neighboring cluster is sent by the UE as the clustering head in the neighboring cluster. . A cluster refers to an area composed of a group of UEs that are temporally synchronized and geographically adjacent to each other, and the UE that transmits the synchronization signal in the configured cluster is the cluster header of the cluster. The UE may be configured to determine downlink synchronization timing information of the corresponding neighboring area according to the detected synchronization signals of the neighboring areas, where the downlink synchronization timing information includes at least information about the starting position of the subframe, and may also include the subframe number and the frame. Number and other information.

Step 61: The UE is selected to select all or part of the neighboring areas as the destination area from the neighboring areas corresponding to the detected synchronization signals.

Step 62: The UE is found to determine physical resource information used by the UE in each destination area to send a discovery signal.

Step 63: The UE is found to determine the discovery signal transmission timing information of the UE in the destination area according to the downlink synchronization timing information of the destination area, and determine the discovery signal transmission timing information and the destination area. UE sends a discovery signal The physical resource corresponding to the used physical resource information, and the discovery signal sent by the UE is detected on the physical resource.

Specifically, in step 61, the UE is selected to select a part of the neighboring area corresponding to each detected synchronization signal as the destination area. The specific implementation may be as follows: the UE is found to be based on the received strength of the detected synchronization signals or detected. The downlink reference signal received power (RSRP) strength of the adjacent area corresponding to each synchronization signal is selected according to a preset destination area selection principle, and a part of the adjacent area is selected from the adjacent areas corresponding to the detected synchronization signals. As a destination area.

For example, the foregoing destination area selection principle may be: selecting at least one neighboring area with the highest receiving signal strength or the downlink RSRP strength as the destination area; or selecting the proximity of the synchronization signal receiving strength or the downlink RSRP strength greater than the preset threshold. The area is used as the destination area, and the threshold may be preset or indicated by the network side device of the cell where the UE is located or the cluster head of the cluster where the UE is located; the preset threshold is a value not less than 0; or, the synchronization signal reception strength is selected. a maximum neighboring area, and a neighboring area in which the difference between the synchronization signal receiving strength and the synchronization signal receiving strength of the neighboring area is within a set range as a destination area; or selecting a neighboring area having the largest downlink RSRP strength, and a downlink RSRP strength and the The difference between the downlink RSRP strength of the adjacent area is the destination area within the set range; the setting range may be specifically within a certain value interval, or greater than a certain value, or not less than a certain value, etc.; The setting range can be preset or by finding the small location of the UE The network side device of the area or the cluster head of the cluster is instructed; the downlink synchronization timing is selected as the destination area in which the difference between the downlink synchronization timing of the serving cell or the cluster in which the UE is found is within the set range; the setting range is specific However, it is within a certain numerical range, or greater than a certain value, or not less than a certain value; The setting range may be preset or indicated by a network side device of the cell in which the UE is located or a cluster head of the cluster in which the UE is located.

Specifically, in step 62, the UE is configured to determine the physical resource information used by the UE in each destination area to send the discovery signal, and specifically includes at least one of the following solutions:

Solution 1: The UE receives the indication information of the physical resource used by the UE in the one or more areas sent by the serving cell or the cluster head of the cluster to send the discovery signal, and obtains the information in each destination area from the indication information. The UE sends the physical resource information used by the discovery signal. In the solution, the indication information includes the identifier information of one or more areas and the physical resource information used by the UE corresponding to each identifier information to send the discovery signal; The physical resource information used by the UE in each destination area to send the discovery signal is obtained. The specific implementation may be as follows: acquiring the identification information of the corresponding destination area from the detected synchronization signals of each destination area, and receiving the indication from the received information. The information in the information is used to read the physical resource information used by the UE to send the discovery signal corresponding to the identification information of each destination area.

Solution 2: The UE receives the downlink broadcast information of the corresponding destination area according to the downlink synchronization timing information of each destination area, and obtains the physics used by the UE in the corresponding destination area to send the discovery signal from the received downlink broadcast information. Specifically, the UE is configured to receive the downlink broadcast information of the corresponding destination area according to the downlink synchronization timing information of each destination area, and the specific implementation may be as follows: the UE detects the downlink synchronization timing information and the physical basis according to each destination area. a broadcast channel (Physical Broadcasting Channel, PBCH) information, determining a resource location for receiving downlink broadcast information of the corresponding destination area, and receiving according to the resource location and the detected information of the destination area in the synchronization signal of the corresponding destination area The downlink broadcast information corresponding to the destination area.

Solution 3: It is found that the UE determines the physical resource information preset to each item. The UE in the local area transmits the physical resource information used by the discovery signal.

Scheme 1 to Scheme 3 can be used separately. That is, one of the schemes can obtain complete physical resource information, or multiple schemes can be used together to obtain complete physical resource information, such as partial physical resource information (such as a subframe). Through the first scheme, the other part of the physical resource information is obtained through scheme 3 (such as bandwidth).

Specifically, in step 63, determining the discovery signal transmission timing information of the UE in the destination area according to the downlink synchronization timing information of the destination area, the specific implementation may be as follows: determining the downlink synchronization timing information of the destination area as the The discovery signal of the UE in the destination area sends timing information; or, according to the downlink synchronization timing information of the destination area and a preset timing offset, the discovery signal transmission timing information of the UE in the destination area is determined, for example, And adding the subframe start position in the downlink synchronization timing information of the destination area to the timing offset, to obtain a subframe start position in the destination area, that is, the UE in the destination area. The discovery signal transmission timing information includes the start position of the subframe in the destination area. The timing offset may be a value greater than 0 or less than 0, and the timing offset may be preset or indicated by a network side device of the cell in which the UE is located or a cluster header of the cluster in which the UE is located.

Specifically, the discovery signal sending timing information includes at least information about a starting position of the subframe; the physical resource information includes at least a subframe number and a bandwidth; and in step 63, determining the discovery signal sending timing information and the destination area The UE may send the physical resource corresponding to the physical resource information used by the discovery signal, and the specific implementation may be as follows: determining, by using the start position of the subframe included in the timing information of the discovery signal, determining, by the UE, the discovery signal in the destination area The physical resource information included in the physical resource information includes a sub-frame set corresponding to the sub-frame number, and the physical resource block (PRB) in the bandwidth included in the physical resource information in the sub-frame set is determined as The discovery signal sends timing information and physical resources used by the UE in the destination area to send the discovery signal. The physical resource corresponding to the information. For example, the subframe set corresponding to the subframe number included in the physical resource information used by the UE in the destination area to transmit the discovery signal is {3, 4, 5}, and the UE in the destination area sends the discovery signal. The physical resource information used includes a bandwidth of 10-100 MHz, and the PRB in the 10-100 MHz in the subframe 3, the PRB in the 10-100 MHz in the subframe 4, and the 10 in the subframe 5. The PRB within -100 MHz is determined as the physical resource corresponding to the discovery signal transmission timing information and the physical resource information used by the UE in the destination area to transmit the discovery signal.

The downlink synchronization timing information and the discovery signal transmission timing information may further include information such as a subframe number and a frame number, and the physical resource information used for transmitting the discovery signal may further include information such as a transmission period.

The present invention will be described below in conjunction with specific embodiments:

Embodiment 1:

In this embodiment, it is assumed that UE A is a discovery UE, and UE B is a discovered UE. The respective serving cells of UE A and UE B are cell A and cell B, respectively, and cell A and cell B are not synchronized.

Step 1: UE B acquires the discovery signal transmission timing according to the downlink synchronization timing of its serving cell (here, it is assumed that the signal transmission timing and the downlink synchronization timing of the serving cell B have a T offset), and the downlink broadcast signal from the serving cell B Obtain the physical resource information used to send the discovery signal, including the sub-frame index, the transmission period, and the bandwidth information. The UE B selects a resource unit on the bandwidth in the subframe corresponding to the subframe index, and periodically sends a discovery signal according to the sending period on the selected resource unit.

Step 2: The UE A detects the downlink synchronization signals sent by the surrounding cells, and obtains the downlink synchronization timing information of the surrounding cells A, B, C, and D according to the detected downlink synchronization signals, including the children of the cells A, B, C, and D. Frame start position (time) and subframe number and frame number information. The process of this step is similar to the process of detecting a multi-cell synchronization signal in the current LTE system.

Step 3: UE A selects a cell with an RSRP strength higher than a preset value as a target cell according to the measured downlink RSRP strength of the cells in the cells A, B, C, and D, and assumes the selected target cell. For cells A, B, C.

Step 4: The UE A determines the resource location of receiving the downlink broadcast information of the corresponding target cell according to the downlink synchronization timing information of each target cell and the bandwidth included in the PBCH. The downlink broadcast information of each target cell is received and detected in combination with the cell ID (Cell ID) of each target cell obtained during synchronization signal detection. The UE A obtains the physical resource information used by the UE in the corresponding target cell to send the discovery signal, including the subframe index, the bandwidth information, the sending period, and the like, from the downlink broadcast information of each target cell.

Step 5: For each target cell A, B, and C, the UE obtains the discovery signal transmission timing information of the UE in the target cell according to the downlink synchronization timing information of the target cell (assuming the discovery signal transmission timing and the downlink synchronization timing of the serving cell) There is an offset of T). The UE A determines the target according to the physical resource information (including the subframe index, the transmission period, and the bandwidth information) used by the UE in the target cell to send the discovery signal, and the discovery signal of the UE in the target cell. The UE in the cell transmits the physical resource used by the discovery signal, and detects the discovery signal sent by the UE in the target cell on the physical resource, as shown in FIG. 7 .

Step 6: The UE A detects the discovery signal sent by the UE B on the physical resource used by the UE in the cell B to send the discovery signal, and performs the identification of the UE B.

Embodiment 2:

In this embodiment, it is assumed that UE A and the discovered UE B are both outside the network coverage, and UE A and UE B respectively detect synchronization signals of two different clusters A and B, and perform other UEs in clusters A and B. Synchronized.

Step 1: UE B uses the downlink synchronization timing of the cluster in which it is located as the discovery signal transmission timing, and periodically transmits the discovery signal on the predefined physical resources. The predefined physical resources include the subframe used for the discovery signal and the occupied bandwidth, and are the same predefined in UE A and UE B.

Step 2: The UE A detects the synchronization signal sent by the UEs in the clusters as the cluster heads, and obtains the downlink synchronization timing information of the corresponding cluster according to the detected synchronization signals. The process of this step is similar to the process of detecting a multi-cell synchronization signal in the current LTE system.

Step 3: UE A selects a partial cluster as a target cluster from the clusters corresponding to the detected synchronization signals. The specific principle is to select a cluster with the highest received strength of the synchronization signal, and a cluster whose synchronization signal reception strength and the synchronization signal reception strength of the cluster do not exceed the set threshold as a target cluster, which is defined in advance on the UE side (for example, 6dB). Suppose the target cluster contains only clusters A and B.

Step 4: The UE A uses the predefined physical resource information as the physical resource information used by the UE to send the discovery signal in each target cluster, that is, a fixed subframe and a bandwidth.

Step 5: For each target cluster, UE A uses the downlink synchronization timing information of the target cluster as the discovery signal transmission timing of the UE in the target cluster, and combines the physical resource information used by the UE to send the discovery signal in the target cluster, including the sub-component. a frame and a bandwidth, etc., determining a physical resource used by the UE in the target cluster to transmit a discovery signal, and detecting a discovery signal sent by the UE in the target cluster on the physical resource, and specifically determining a physical resource used by the discovery signal Similar to Figure 7.

Step 6: The UE A detects the discovery signal of the UE B on the physical resource used by the UE in the cluster B to send the discovery signal, and performs the identification of the UE B.

Referring to FIG. 8, an embodiment of the present invention provides a UE, where the UE includes: a synchronization signal detecting unit 80, configured to detect a synchronization signal of a neighboring area, where the neighboring area is a neighboring cell or a neighboring cluster; and a destination area selecting unit 81, configured to Selecting all or part of the neighboring areas as the destination area from the neighboring areas corresponding to the detected synchronization signals; the physical resource determining unit 82 is configured to determine physical resource information used by the UE in each destination area to send the discovery signal; a signal detecting unit 83 for each destination area according to the destination The downlink synchronization timing information of the local area determines the discovery signal transmission timing information of the UE in the destination area, and determines the physics of the discovery signal transmission timing information and the physical resource information used by the UE in the destination area to send the discovery signal. A resource on which the discovery signal sent by the UE is detected.

Further, the destination area selecting unit 81 is configured to: according to the received receiving strength of each synchronization signal or the detected downlink RSRP strength of the adjacent area corresponding to each synchronization signal, according to a preset destination area selection principle, A part of the adjacent area corresponding to each of the detected synchronization signals is selected as the destination area.

Further, the destination area selection unit 81 uses the destination area selection principle as: selecting at least one adjacent area with the highest synchronization signal receiving strength or the downlink RSRP strength as the destination area; or selecting the synchronization signal receiving strength or the downlink RSRP. The neighboring area whose intensity is greater than the preset threshold is used as the destination area; or the neighboring area with the synchronization signal receiving strength or the downlink RSRP strength is the largest, and the difference between the synchronization signal receiving strength or the downlink RSRP strength of the neighboring area is within the setting range. The adjacent area within the area is used as the destination area; or, the neighboring area within the set range that is different from the downlink synchronization timing of the serving cell or the cluster in which the UE is found is selected as the destination area.

Further, the physical resource determining unit 82 includes at least one of a first determining unit, a second determining unit, and a third determining unit: the first determining unit is configured to receive a serving cell of the UE or a cluster head of the cluster. The UE in the one or more areas sends the indication information of the physical resource used by the discovery signal, and the physical resource information used by the UE in each destination area to send the discovery signal is obtained from the indication information; The second determining unit is configured to receive downlink broadcast information of the corresponding destination area according to the downlink synchronization timing information of each destination area, and obtain a discovery signal sent by the UE in the corresponding destination area from the received downlink broadcast information. The third resource determining unit is configured to determine the physical resource information used by the UE in each destination area to send the discovery signal.

Further, the first determining unit is configured to: receive indication information of a physical resource used by the UE in the one or more areas sent by the serving cell or the cluster head of the cluster to send the discovery signal, where the indication information includes one Or the identification information of the multiple areas and the physical resource information used by the UE corresponding to each identification information to send the discovery signal; and acquiring the identification information of the corresponding destination area from the detected synchronization signals of each destination area, from the indication information The physical resource information used by the UE corresponding to the identification information of each destination area to send the discovery signal is read.

Further, the second determining unit is configured to: determine, according to downlink synchronization timing information and PBCH information of each destination area, a resource location for receiving downlink broadcast information of the corresponding destination area, according to the resource location and the detected corresponding destination. The identification information of the destination area in the synchronization signal of the local area receives the downlink broadcast information of the corresponding destination area, and obtains the physical resource information used by the UE in the corresponding destination area to send the discovery signal from the received downlink broadcast information.

Further, the discovery signal detecting unit 83 is configured to determine downlink synchronization timing information of the destination area as discovery signal transmission timing information of the UE in the destination area, or according to downlink synchronization timing information of the destination area. And the preset timing offset amount, and the discovery signal transmission timing information of the UE in the destination area is obtained.

Further, the discovery signal detecting unit 83 is configured to: at least the sub-frame start position is included in the discovery signal transmission timing information If the physical resource information includes at least the subframe number and the bandwidth, the physics of the UE transmitting the discovery signal in the destination area is determined by using the start position of the subframe included in the discovery signal transmission timing information as a reference. The sub-frame set corresponding to the sub-frame number included in the resource information, and the physical resource block PRB in the bandwidth included in the physical resource information in the sub-frame set is determined as the discovery signal transmission timing information and the purpose The UE in the local area transmits the physical resource corresponding to the physical resource information used by the discovery signal.

Referring to FIG. 9, an embodiment of the present invention provides a UE, where the UE includes: a memory 91 and a processor 92. The processor 92 is configured with a computer program for executing the method in the embodiment of the present invention; The code for storing the computer program may be used to configure the processor 92. The processor 92 may include a baseband processing component, a radio frequency processing component, and the like according to actual needs, for transmitting related information.

Specifically, the processor 92 is configured to: detect a synchronization signal of a neighboring area, where the neighboring area is a neighboring cell or a neighboring cluster; select all or part of the neighboring area from the detected neighboring areas corresponding to each synchronization signal as a destination area; The UE in each destination area sends the physical resource information used by the discovery signal. For each destination area, the discovery signal transmission timing information of the UE in the destination area is determined according to the downlink synchronization timing information of the destination area, and the determination is performed. The discovery signal transmission timing information and the physical resource corresponding to the physical resource information used by the UE in the destination area to send the discovery signal, and detecting the discovery signal sent by the UE on the physical resource.

Further, the processor 92 responds to the detected synchronization signals according to the preset destination region selection principle according to the received reception strength of each synchronization signal or the detected downlink RSRP strength of each synchronization signal corresponding to each synchronization signal. Selected in the neighborhood Part of the neighborhood is the destination area.

Further, the destination area selection principle used by the processor 92 is: selecting at least one neighboring area with the highest receiving signal strength or the downlink RSRP intensity as the destination area; or selecting the synchronization signal receiving strength or the downlink RSRP intensity is greater than the preset. The neighboring area of the threshold is used as the destination area; or, the neighboring area with the synchronization signal receiving strength or the downlink RSRP strength is the largest, and the difference between the synchronization signal receiving strength or the downlink RSRP strength of the neighboring area is within the set range. As the destination area; or, the neighboring area whose difference from the downlink synchronization timing of the serving cell or the cluster of the found UE is within the set range is selected as the destination area.

Further, the processor 92 receives the indication information of the physical resource used by the UE in the one or more areas sent by the serving cell or the cluster head of the cluster to send the discovery signal, and obtains the information in each destination area from the indication information. The UE transmits the physical resource information used by the discovery signal; receives the downlink broadcast information of the corresponding destination area according to the downlink synchronization timing information of each destination area, and obtains the UE in the corresponding destination area from the received downlink broadcast information. The physical resource information used for transmitting the discovery signal is determined; the preset physical resource information is determined as the physical resource information used by the UE in each destination area to send the discovery signal.

Further, the processor 92 receives the indication information of the physical resource used by the UE in the one or more areas sent by the serving cell or the cluster head of the cluster to send the discovery signal, where the indication information includes one or more areas. Identifying information and physical resource information used by the UE corresponding to each identification information to send a discovery signal; acquiring identification information of the corresponding destination area from the detected synchronization signals of each destination area, and reading each destination from the indication information The physical resource information used by the UE corresponding to the identifier information of the area to send the discovery signal.

Further, the processor 92 determines, according to the downlink synchronization timing information of each destination area and the physical broadcast channel PBCH information, that the downlink broadcast of the corresponding destination area is received. The resource location of the information receives the downlink broadcast information of the corresponding destination area according to the resource location and the detected information of the destination area in the synchronization signal of the corresponding destination area, and obtains the corresponding destination from the received downlink broadcast information. The UE in the area transmits the physical resource information used by the discovery signal.

Further, the processor 92 determines the downlink synchronization timing information of the destination area as the discovery signal transmission timing information of the UE in the destination area; or, according to the downlink synchronization timing information of the destination area and a preset timing offset The shift amount is used to determine the discovery signal transmission timing information of the UE in the destination area.

Further, the processor 92 sends at least the information of the start position of the sub-frame at the discovery signal transmission timing information, and the sub-message included in the timing information is sent by the discovery signal when the physical resource information includes at least the sub-frame number and the bandwidth. The frame start position is a reference, and the subframe set corresponding to the subframe number included in the physical resource information used by the UE in the destination area to send the discovery signal is determined, and the physical resource information in the subframe set is determined. The physical resource block PRB in the included bandwidth is determined as the physical resource corresponding to the discovery signal transmission timing information and the physical resource information used by the UE in the destination area to send the discovery signal.

In summary, the solution provided by the embodiment of the present invention includes: in the solution provided by the embodiment of the present invention, the UE detects the synchronization signal of the neighboring area, and selects all or part of the neighboring area as the destination area from the adjacent areas corresponding to the detected synchronization signals. Determining physical resource information used by the UE in each destination area to send a discovery signal, and determining, for each destination area, discovery signal transmission timing information of the UE in the destination area according to downlink synchronization timing information of the destination area, Determining the discovery signal transmission timing information and the physical resource corresponding to the physical resource information used by the UE in the destination area to send the discovery signal, and detecting, on the physical resource, the discovery signal sent by the UE in the destination area, that is, the discovered UE . With the present scheme, when the UE and the discovered UE belong to two cells that are not synchronized, the UE can find that the UE transmits the timing information of the discovery signal of the discovered UE by detecting the synchronization signal of the cell where the UE is found, and then sends the timing according to the discovery signal. Information determined to be sent by the discovered UE Detecting the physical resource used by the signal, and detecting the discovery signal sent by the discovered UE on the physical resource; when the UE is found and the discovered UE is not under the network coverage, the UE is found to be able to detect the synchronization of the cluster in which the UE is found. The signal is sent to the discovery signal of the discovered UE, and the timing information is used to determine the physical resource used by the discovered UE to send the discovery signal, and the discovery signal sent by the discovered UE is detected on the physical resource. The problem of how the UE discovers the discovery signal of the discovered UE when the UE and the discovered UE belong to two cells that are not synchronized or when the UE is found and the discovered UE is not within the network coverage is solved.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor or other programmable data processing device to produce a machine for executing instructions by a processor of a computer or other programmable data processing device Means are provided for implementing the functions specified in one or more of the flow or in one or more blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can boot a computer or other programmable data processing device to operate in a particular manner, such that instructions stored in the computer readable memory produce an article of manufacture including the instruction device. The instruction means implements the functions specified in one or more blocks of the flow or in a flow or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device to perform a series of operational steps on a computer or other programmable device to produce computer-implemented processing on a computer or other programmable device. The instructions executed above provide steps for implementing the functions specified in one or more blocks of the flowchart or in a block or blocks of the flowchart.

Although a preferred embodiment of the invention has been described, those skilled in the art Additional changes and modifications may be made to these embodiments once the basic inventive concept is known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

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Claims (16)

A method for detecting a discovery signal, comprising: determining, according to frame information FI of each time slot received, a specific time slot indicated by a plurality of nodes other than the local node in the FI, and occupying the specific time slot The specific occupancy information of the multiple nodes is detected; the user equipment UE detects the synchronization signal of the neighboring area, and the neighboring area is a neighboring cell or a neighboring cluster; the UE is found to select the destination area from the neighboring areas corresponding to the detected synchronization signals; The UE is configured to determine physical resource information used by the UE in each destination area to send the discovery signal; and the UE is found to determine the discovery signal of the UE in the destination area according to the downlink synchronization timing information of the destination area for each destination area. The timing information determines a physical resource corresponding to the physical signal information used by the UE in the destination area to send the discovery signal, and detects the discovery signal sent by the UE on the physical resource. The discovery signal detection method according to claim 1, wherein the discovery UE selects a partial neighboring area as a destination area from the neighboring areas corresponding to the detected synchronization signals, and specifically includes: discovering, according to the detected synchronization signals, the UE The received strength or the downlink reference signal received power RSRP strength of the adjacent region corresponding to each detected synchronization signal, and according to the preset destination region selection principle, a part of the adjacent region is selected from the adjacent regions corresponding to the detected synchronization signals. Destination area. The discovery signal detection method according to claim 2, wherein the destination area selection principle is: Selecting at least one adjacent area with the highest receiving signal strength or the downlink RSRP strength as the destination area; or selecting the neighboring area with the synchronization signal receiving strength or the downlink RSRP strength greater than the preset threshold as the destination area; or, selecting the synchronization signal a neighboring area having the highest receiving strength or downlink RSRP strength, and a neighboring area having a difference between the synchronization signal receiving strength or the downlink RSRP strength of the neighboring area within a set range as a destination area; or selecting and serving the UE's serving cell or The adjacent area in which the difference of the downlink synchronization timing of the cluster is within the set range is taken as the destination area. The discovery signal detection method according to claim 1, wherein the discovery UE determines the physical resource information used by the UE in each destination area to send the discovery signal, and specifically includes at least one of the following solutions: Option 1: discovering the UE receiving The information of the physical resource used by the UE in one or more areas sent by the serving cell or the cluster head of the cluster to transmit the discovery signal, and the UE in each destination area is used to send the discovery signal. Physical resource information; scheme 2: The UE receives the downlink broadcast information of the corresponding destination area according to the downlink synchronization timing information of each destination area, and obtains the UE in the corresponding destination area from the received downlink broadcast information to send the discovery. The physical resource information used by the signal; scheme 3: The UE discovers the physical resource information that is preset, and determines the physical resource information used by the UE in each destination area to send the discovery signal. The discovery signal detecting method according to claim 4, wherein the indication information includes one or The identification information of the multiple areas and the physical resource information used by the UE corresponding to each identifier information to send the discovery signal. The physical resource information used by the UE in each destination area to send the discovery signal is obtained from the indication information, and specifically includes: The identification information of the corresponding destination area is obtained from the detected synchronization signal of each destination area, and the physical resource information used by the UE corresponding to the identification information of each destination area to transmit the discovery signal is read from the indication information. The discovery signal detection method according to claim 4, wherein the discovery UE receives the downlink broadcast information of the corresponding destination area according to the downlink synchronization timing information of each destination area, which specifically includes: discovering the UE according to each destination area The downlink synchronization timing information and the physical broadcast channel PBCH information determine a resource location for receiving downlink broadcast information of the corresponding destination area, and according to the resource location and the detected identification information of the destination area in the synchronization signal of the corresponding destination area, Receiving downlink broadcast information corresponding to the destination area. The discovery signal detection method according to claim 1, wherein the determining, according to the downlink synchronization timing information of the destination area, the discovery signal transmission timing information of the UE in the destination area, specifically: the downlink of the destination area The synchronization timing information is determined to be the timing information of the discovery signal of the UE in the destination area; or the discovery of the UE in the destination area is obtained according to the downlink synchronization timing information of the destination area and a preset timing offset. Signal timing information. The discovery signal detection method according to any one of claims 1 to 7, wherein the discovery signal transmission timing information includes at least information of a start position of the subframe; the physical resource information includes at least The subframe number and the bandwidth; the physical resource corresponding to the physical resource information used by the UE to send the discovery signal in the destination area, and the specific information includes: sending the timing information by using the discovery signal The start position of the subframe is a reference, and the subframe set corresponding to the subframe number included in the physical resource information used by the UE in the destination area to send the discovery signal is determined, and the subframe set in the subframe set The physical resource block PRB in the bandwidth included in the physical resource information is determined as the physical resource corresponding to the discovery signal transmission timing information and the physical resource information used by the UE in the destination area to send the discovery signal. A user equipment UE, characterized in that the UE comprises: a synchronization signal detecting unit, configured to detect a synchronization signal of a neighboring area, the neighboring area is a neighboring cell or an adjacent cluster; and the destination area selecting unit is configured to detect from a destination area is selected in a neighboring area corresponding to each synchronization signal; a physical resource determining unit is configured to determine physical resource information used by the UE in each destination area to send a discovery signal; and a discovery signal detecting unit is configured for each destination area Determining the discovery signal transmission timing information of the UE in the destination area according to the downlink synchronization timing information of the destination area, determining the discovery signal transmission timing information, and the physical resource information used by the UE in the destination area to send the discovery signal. Corresponding physical resources, detecting a discovery signal sent by the UE on the physical resource. The user equipment UE according to claim 9, wherein the destination area selecting unit is configured to: according to the received strength of the detected synchronization signals or the detected synchronization signals The downlink reference signal of the neighboring area receives the power RSRP strength, and selects a part of the neighboring area as the destination area from the adjacent areas corresponding to the detected synchronization signals according to a preset destination area selection principle. The user equipment UE according to claim 10, wherein the destination area selection principle used by the destination area selection unit is: selecting at least one adjacent area with the highest synchronization signal receiving strength or the downlink RSRP strength as the destination area; Alternatively, a neighboring area with a synchronization signal receiving strength or a downlink RSRP strength greater than a preset threshold is selected as a destination area; or a neighboring area with a synchronization signal receiving strength or a downlink RSRP strength being the largest, and a synchronization signal receiving strength with the neighboring area are selected. Or the neighboring area in which the difference of the downlink RSRP strength is within the set range is used as the destination area; or the neighboring area whose difference from the downlink synchronization timing of the serving cell or the cluster of the found UE is within the set range is selected as the destination area. The user equipment UE according to claim 9, wherein the physical resource determining unit comprises at least one of a first determining unit, a second determining unit, and a third determining unit: the first determining unit is configured to receive its own The UE in one or more areas sent by the serving cell or the cluster head of the cluster sends indication information of the physical resource used by the discovery signal, and obtains, from the indication information, the physics used by the UE in each destination area to send the discovery signal. The second information determining unit is configured to receive downlink broadcast information of the corresponding destination area according to downlink synchronization timing information of each destination area, and obtain the downlink broadcast information from the received downlink broadcast information. Corresponding to the physical resource information used by the UE in the destination area to send the discovery signal; the third determining unit is configured to determine the preset physical resource information as the physical resource used by the UE in each destination area to send the discovery signal. News. The user equipment UE according to claim 12, wherein the first determining unit is configured to: receive a physical medium used by a UE in one or more areas sent by a serving cell or a cluster head of the cluster to send a discovery signal, The indication information of the resource includes the identification information of one or more areas and the physical resource information used by the UE corresponding to each identification information to send the discovery signal; and the corresponding destination is obtained from the detected synchronization signals of each destination area. The identification information of the local area, and the physical resource information used by the UE corresponding to the identification information of each destination area to send the discovery signal is read from the indication information. The user equipment UE according to claim 12, wherein the second determining unit is configured to: determine, according to the downlink synchronization timing information of each destination area and the physical broadcast channel PBCH information, the downlink broadcast information of the corresponding destination area. The resource location receives the downlink broadcast information of the corresponding destination area according to the resource location and the detected identification information of the destination area in the synchronization signal of the corresponding destination area, and obtains the corresponding destination from the received downlink broadcast information. The UE in the area sends the physical resource information used by the discovery signal. The user equipment UE according to claim 9, wherein the discovery signal detecting unit is configured to: determine downlink synchronization timing information of the destination area as discovery signal transmission timing information of the UE in the destination area; or The discovery signal transmission timing information of the UE in the destination area is obtained based on the downlink synchronization timing information of the destination area and a preset timing offset amount. The user equipment UE according to any one of claims 9 to 15, wherein the discovery signal detecting unit is configured to: at least the information of the start position of the subframe, the physical resource information, When at least the sub-frame number and the bandwidth are included, the sub-frame information included in the physical resource information used by the UE in the destination area to transmit the discovery signal is determined based on the start position of the sub-frame included in the discovery signal transmission timing information. The subframe set corresponding to the frame number, the physical resource block PRB in the bandwidth included in the physical resource information in the subframe set is determined as the discovery signal sending timing information and the UE in the destination area sends The physical resource corresponding to the physical resource information used by the discovery signal.