TWI584669B - A method and apparatus for determining a relay node - Google Patents

Description

Method and device for determining relay node

The invention belongs to the field of communication technologies, and in particular to a method and a terminal for signal transmission.

Device-to-device (D2D) communication, that is, terminal direct-through technology, means that adjacent terminals can transmit data through a direct link within a short range without going through a central node (ie, a base station). Forwarding does not require information transmission over traditional cellular links.

Long Term Evolution (LTE) D2D technology refers to the D2D discovery and communication process that is controlled by the LTE network operating in the LTE licensed band. On the one hand, the advantages of D2D technology can be fully utilized, and the control of the LTE network can also overcome some problems of the 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".

LTE D2D technology includes two aspects of D2D discovery and D2D communication. The D2D discovery refers to a D2D UE to discover other D2D UEs in the vicinity. The discovery between D2D UEs is realized by the discovery signal, and the discovery signal can carry identification information, such as device information, application information, service type, and the like. D2D communication refers to the way that D2D UEs directly transmit data through device-to-device communication connection. D2D communication can be performed on the basis of D2D discovery.

Based on the D2D discovery and communication technology, the UE can perform data transmission with the network or other UEs through a relay. There are two main relay scenarios:

The first type of communication between the UE and the network through the Relay UE is called UE-Network Relay. As shown in FIG. 1 , UE 2 outside the network coverage communicates with the network, and UE1 is used as a Relay node to forward its own uplink and downlink signals through UE1. The communication between the UE1 and the UE2 is implemented by D2D communication, and the UE1 and the network are implemented by using cellular communication.

Second, the manner in which the UE communicates with the target UE through the Relay UE is called UE-UE Relay, as shown in FIG. 2 . In order to communicate with the UE 4 that is not in the communication range of the UE, the UE2 forwards its own information through the UE1, wherein the UE1 and the UE2, the UE1 and the UE4 implement data transmission through D2D communication.

In the above two Relay scenarios, the source UE needs to find a Relay UE capable of relaying data for itself, and the UE can simultaneously transmit data with the source UE and the target node.

The process in which the source UE discovers the Relay UE can be implemented through the D2D discovery process, and the following two methods are specifically implemented:

1) The Relay UE broadcasts its own discovery signal, which carries its own information as a Relay node. After receiving the discovery signal, the source UE determines whether the Relay UE is selected to forward its own signal.

2) The source UE sends a request discovery signal, where the signal includes the information of the source UE and the target node, and after receiving the request discovery signal, the UE near the source UE determines whether it can serve as a Relay UE between the source UE and the target node. If yes, the response discovery signal is returned, and the source UE determines whether to select the Relay UE to forward after receiving the response discovery signal. signal.

If there are multiple Relay UEs satisfying the relay requirement between the source UE and the target node, how the source UE selects the optimal one from the multiple Relay UEs to ensure the data transmission performance between the source UE and the target UE is currently issues that need resolving.

The present invention provides a method and apparatus for determining a relay node to determine a relay node between a source UE and a target node to ensure data transmission performance between the source UE and the target node.

The specific technical solution provided by the embodiment of the present invention is as follows: In a first aspect, a method for determining a relay node is provided, where: a source user equipment (UE) receives a discovery signal sent by at least one candidate relay node, where the discovery signal is And carrying the channel quality information between the candidate relay node and the target node; the source UE selects one of the at least one candidate relay node according to each of the discovery signal and the channel quality information carried in each of the discovery signals. As the source UE and the relay node of the target node.

Optionally, the source UE receives the discovery signal sent by the at least one candidate relay node, and the source UE detects the discovery signal sent by the at least one UE, and determines the UE according to the relay capability indication information carried in the discovery signal. Whether it is a candidate relay node.

Optionally, the source UE according to each of the discovery signals and each of the discovery signals The channel quality information carried in the number, selecting one of the at least one candidate relay node as the source UE and the relay node of the target node, comprising: the source UE acquiring the discovery signal of each candidate relay node respectively Receiving quality information, selecting one of the at least one candidate relay node as the source UE according to the reception quality information of the discovery signal of the candidate relay node and the channel quality information carried in the discovery signal of the candidate relay node And the relay node of the target node.

Optionally, the target node is a UE in device-to-device (D2D) communication, or is a network device.

Optionally, before the source UE receives the discovery signal sent by the candidate relay node, the method further includes: the source UE sends a request discovery signal, where the request discovery signal carries information about the source UE and information of the target node.

Optionally, the channel quality information includes: a channel quality indicator (CQI), a received power value when the candidate relay node receives the signal of the target node, and a signal to interference and noise ratio between the candidate relay node and the target node. A (SINR) estimate, a combination of any one or more of Reference Signal Received Power (RSRP) obtained by the candidate relay node for signal measurement of the target node.

Optionally, after the source UE selects one of the at least one candidate relay node as the source UE and the target node, the method further includes: establishing D2D communication between the source UE and the relay node. The source UE determines the modulation and coding mode of the D2D communication according to the channel quality information carried in the discovery signal of the relay node.

In a second aspect, a method for determining a relay node is provided, comprising: a user equipment (UE) determining that it can serve as a candidate relay node between a source UE and a target node; the UE measuring itself and the target node The channel quality information is generated and the discovery signal is generated. The discovery signal carries the channel quality information. The UE sends the discovery signal to the source UE, and the source UE determines, according to the discovery signal, whether the UE is selected as the relay node.

Optionally, the source UE is any other UE within the UE communication range, or is a UE that sends a request discovery signal to the UE.

Optionally, the target node is a UE in device-to-device (D2D) communication, or is a network device.

Optionally, the UE determines a condition that the UE can serve as a candidate relay node between the source UE and the target node, and includes a combination of any one or more of the following conditions: the UE is configured by the network side to be the source UE and the network. a candidate relay node for roadside communication; the UE is authorized by the network side to be a candidate relay node for inter-UE communication; the UE is preconfigured to be a candidate relay node capable of inter-UE communication; the UE can simultaneously discover the source UE And the target node; the channel quality between the UE and the source UE and the channel quality between the UE and the target node satisfy a preset condition.

Optionally, before the UE determines that it can serve as a candidate relay node between the source UE and the target node, the method further includes: The UE receives the request discovery signal sent by the source UE, where the request discovery signal carries information of the source UE and information of the target node.

Optionally, the discovery signal further includes device information of the UE and/or relay capability indication information of the UE.

Optionally, the UE measures channel quality information between the UE and the target node, and the UE performs measurement on the synchronization signal, the reference signal, or the discovery signal sent by the target node to obtain the channel quality information.

Optionally, the channel quality information includes: a channel quality indicator (CQI), a received power value when the UE receives the signal of the target node, and a signal to interference and noise ratio (SINR) estimated value between the UE and the target node, A combination of any one or more of Reference Signal Received Power (RSRP) obtained by the UE measuring the signal of the target node.

The collaboration device provides a user equipment (UE), including: a receiving unit, configured to receive a discovery signal sent by at least one candidate relay node, where the discovery signal carries a channel between the candidate relay node and the target node a quality information; a processing unit, configured to select one of the at least one candidate relay node as the source UE according to each of the discovery signal received by the receiving unit and the channel quality information carried in each of the discovery signals The relay node of the target node.

Optionally, the receiving unit is configured to: detect a discovery signal sent by the at least one UE, and determine, according to the relay capability indication information carried in the discovery signal, whether the UE is a candidate relay node.

Optionally, the processing unit is specifically configured to: Obtaining, respectively, the reception quality information of the discovery signal of each candidate relay node, according to the reception quality information of the discovery signal of the candidate relay node and the channel quality information carried in the discovery signal of the candidate relay node, from at least one One of the candidate relay nodes is selected as the source UE and the relay node of the target node.

Optionally, the target node is a UE in device-to-device (D2D) communication, or is a network device.

Optionally, the method further includes: a sending unit, configured to: before receiving the discovery signal sent by the candidate relay node, send a request discovery signal, where the request discovery signal carries information of the source UE and information of the target node.

Optionally, the channel quality information includes: a channel quality indicator (CQI), a received power value when the candidate relay node receives the signal of the target node, and a signal to interference and noise ratio between the candidate relay node and the target node. A (SINR) estimate, a combination of any one or more of Reference Signal Received Power (RSRP) obtained by the candidate relay node for signal measurement of the target node.

Optionally, the processing unit is further configured to: after selecting one of the at least one candidate relay node as the relay node of the source UE and the target node, establish a D2D communication connection with the relay node; The channel quality information carried in the discovery signal of the relay node determines the modulation and coding mode of the D2D communication.

A fourth aspect, a user equipment (UE) is provided, including: a determining unit, configured to determine that the UE is a candidate relay node between a source UE and a target node; a generating unit, configured to measure channel quality information between the UE and the target node, and generate a discovery signal, where the discovery signal carries the channel quality information; and a sending unit, configured to send the discovery signal to the source UE, by the source The UE determines whether to select the UE as a relay node according to the discovery signal.

Optionally, the source UE is any other UE within the UE communication range, or is a UE that sends a request discovery signal to the UE.

Optionally, the target node is a UE in device-to-device (D2D) communication, or is a network device.

Optionally, the determining unit is specifically configured to: determine, by using any one or more of the following conditions, that the UE can serve as a candidate relay node between the source UE and the target node: the UE is configured by the network side to be a source. a candidate relay node that communicates with the network side by the UE; the UE is authorized by the network side to be a candidate relay node for inter-UE communication; the UE is preconfigured to be a candidate relay node capable of inter-UE communication; the UE can simultaneously discover The source UE and the target node; the channel quality between the UE and the source UE and the channel quality between the UE and the target node satisfy a preset condition.

Optionally, the method further includes: receiving, by the receiving unit, the request discovery signal sent by the source UE, where the determining unit determines that the UE can serve as a candidate relay node between the source UE and the target node, where the request is found in the signal The information of the source UE and the information of the target node are carried.

Optionally, the discovery signal further includes device information of the UE and/or relay capability indication information of the UE.

Optionally, the generating unit is configured to: perform measurement on the synchronization signal, the reference signal, or the discovery signal sent by the target node, to obtain the channel quality information.

Optionally, the channel quality information includes: a channel quality indicator (CQI), a received power value when the UE receives the signal of the target node, and a signal to interference and noise ratio (SINR) estimated value between the UE and the target node, A combination of any one or more of Reference Signal Received Power (RSRP) obtained by the UE measuring the signal of the target node.

A fifth aspect provides a user equipment, including: a processor; and a memory connected to the processor through a bus interface, and configured to store programs and materials used by the processor when performing operations; When the processor calls and executes the program and the data stored in the memory, the following function module is implemented: the receiving unit is configured to receive a discovery signal sent by the at least one candidate relay node, where the candidate signal carries the candidate relay Channel quality information between the node and the target node; the processing unit is configured to: according to each of the discovery signals received by the receiving unit and the channel quality information carried in each of the discovery signals, from at least one candidate relay node Select one as the source user device and the relay node of the target node.

In a sixth aspect, a user equipment is provided, including: a processor; The memory is connected to the processor through a bus interface, and is used to store programs and materials used by the processor when performing operations, when the processor calls and executes programs and materials stored in the memory, Implementing a function module: a determining unit, configured to determine that the user equipment can serve as a candidate relay node between the source user equipment and the target node; and a generating unit, configured to measure between the user equipment and the target node The channel quality information generates a discovery signal, and the discovery signal carries the channel quality information; the sending unit is configured to send the discovery signal to the source user equipment, and the source user equipment determines whether to select the use according to the discovery signal. The device acts as a relay node.

Based on the foregoing technical solution, in the embodiment of the present invention, the source UE is selected from multiple candidates according to the discovery signal sent by each candidate relay node and the channel quality information between the candidate relay node and the target node carried in the discovery signal. The relay node is selected in the node, so that the channel quality information of the relay node and the target node is comprehensively considered when selecting the relay node, thereby ensuring the data transmission performance between the source UE and the target node.

501‧‧‧ receiving unit

502‧‧‧Processing unit

503‧‧‧Send unit

601‧‧‧ transceiver

602‧‧‧ processor

701‧‧‧determination unit

702‧‧‧Generation unit

703‧‧‧Send unit

704‧‧‧ receiving unit

801‧‧‧ processor

802‧‧‧ transceiver

1 is a schematic diagram of a scenario in which an existing UE communicates with a network through a relay; FIG. 2 is a schematic diagram of a scenario in which an existing UE communicates with other UEs through a relay; FIG. 3 is a schematic diagram of a method for determining a relay node by a source UE according to an embodiment of the present invention; Schematic diagram of the process; FIG. 4 is a schematic flowchart of a method for determining a relay node by a candidate relay node according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of a UE according to an embodiment of the present invention; FIG. 6 is a schematic structural diagram of another UE according to an embodiment of the present invention; FIG. 7 is a schematic structural diagram of another UE according to an embodiment of the present invention; Another UE structure diagram.

The present invention will be further described in detail with reference to the accompanying drawings in the claims. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

In the embodiment of the present invention, as shown in FIG. 3, the detailed process of determining the relay node by the source UE is as follows:

Step 301: The source UE receives a discovery signal sent by at least one candidate relay node, where the discovery signal carries channel quality information between the candidate relay node and the target node.

The candidate relay node is any other UE within the communication range of the source UE, and may also be the UE that receives the request discovery signal sent by the source UE.

The target node may be a UE in D2D communication, or may be a network device.

Optionally, the source UE receives the discovery message sent by the at least one candidate relay node. Before the number, the source UE sends a request discovery signal, where the request discovery signal carries the information of the source UE and the information of the target node.

Specifically, if the target node is a network device, the candidate relay node may be determined by a combination of any one or more of the following determining manners: the candidate relay node is configured on the network side and can be used as the network coverage. The UE of the relay node that communicates with the network device; or the candidate relay node is a UE that is located in the network coverage and can discover the source UE at the same time; or the channel between the candidate relay node and the source UE Quality, and the quality of the channel between the candidate relay node and the network device meets the preset conditions.

Specifically, if the target node is a UE in D2D communication, the candidate relay node may be determined by a combination of any one or more of the following determining manners: the candidate relay node is authorized by the network side to be capable of communicating between UEs. a UE of the relay node; or, the candidate relay node is a pre-configured UE capable of being a relay node for communication between UEs; or the candidate relay node is a UE capable of simultaneously discovering the source UE and the target node; or The channel quality between the candidate relay node and the source UE and the channel quality between the candidate relay node and the target node satisfy a preset condition.

Optionally, the candidate relay node may broadcast the discovery signal; or after receiving the request discovery signal of the source UE, return a response signal to the source UE, where the response signal is a discovery signal, where the request discovery signal carries the source Information about the UE and information about the target node.

Optionally, the discovery signal sent by the candidate relay node also carries its own information, such as its own device information, D2D identifier for D2D transmission, and its own relay capability. Instructions, etc.

Optionally, the channel quality information includes, but is not limited to, a Channel Quality Indication (CQI), a received power value when the candidate relay node receives the signal of the target node, and a signal between the candidate relay node and the target node. A combination of any one or more of a Signal to Interference and Noise Ratio (SINR) estimate and a Reference Signal Receiving Power (RSRP) obtained by the candidate relay node for signal measurement of the target node.

Specifically, the candidate relay node measures the synchronization signal, the reference signal, or the discovery signal sent by the target node to obtain channel quality information. For example, if the target node is a network device, the channel quality information is the measured RSRP. If the target node is the UE, the channel quality information is that the candidate relay node measures the received signal sent by the target node or the received power obtained by the discovery signal.

In a specific implementation, the source UE not only receives the discovery signal sent by the candidate relay node, but also receives the discovery signal sent by other UEs, and the source UE needs to determine whether the discovery signal is from the candidate relay node. Optionally, the source UE detects the discovery signal sent by the at least one UE, and determines whether the UE is a candidate relay node according to the relay capability indication information carried in the discovery signal. The relay capability indication information is information used to indicate the relay capability of the UE.

Specifically, if the relay capability indication information carried in the discovery signal sent by the UE indicates that the UE has the relay capability, the UE is the candidate relay node; if the relay capability indication information indicator carried in the discovery signal sent by the UE When the UE does not have a relay capability, the UE cannot be a candidate relay node.

Step 302: The source UE is based on each discovery signal and each discovery signal. The channel quality information carried is selected from at least one of the candidate relay nodes as a relay node of the source UE and the target node.

Optionally, the source UE separately obtains the reception quality information of the discovery signal of each candidate relay node, and according to the reception quality information of the discovery signal of the candidate relay node and the channel quality information carried in the discovery signal of the candidate relay node. And selecting one of the at least one candidate relay node as the source UE and the target node. Specifically, the reception quality information may be a received power or a received signal to interference and noise ratio.

Specifically, the source UE separately acquires the received power (or the received signal to interference and noise ratio) of the discovery signal of each candidate relay node, according to the received power (or the received signal to interference and noise ratio) of the discovery signal of the candidate relay node, and the The channel quality information carried in the discovery signal of the candidate relay node determines whether the candidate relay node is selected as the source UE and the relay node of the target node.

For example, the source UE may calculate the transmission efficiency of the candidate relay node according to the received signal to interference and noise ratio of the discovery signal of the candidate relay node and the channel quality information carried in the discovery signal of the candidate relay node; The maximum value of the transmission efficiency of the candidate relay node, and the candidate relay node corresponding to the maximum value is determined as the relay node.

In a specific embodiment, the calculation formula of the transmission efficiency can be expressed as: C _i = A log ₂ (1+ P ₁ ) + B log ₂ (1+ P ₂ )

P ₁ represents the received signal to interference and noise ratio of the discovery signal, P ₂ represents the signal to interference and noise ratio corresponding to the channel quality information carried in the discovery signal, A represents a preset first weighting value, and B represents a preset second weighting. The value, C _{i ,} represents the transmission efficiency.

In addition, the source UE can also judge based on the pre-configured threshold value, only A measurement parameter, such as the channel quality information carried in the discovery signal is greater than the pre-configured first threshold and/or the received quality of the discovery signal (received power, received signal to interference and noise ratio) is greater than the pre-configured second threshold When the transmission efficiency is greater than the pre-configured third threshold, the corresponding candidate relay node can be used as the relay node.

Optionally, after determining the relay node, the source UE may further perform link self-adjustment adjustment according to the channel quality information corresponding to the relay node, for example, selecting a size of the transmitted data packet according to the channel quality information. Specifically, after the source UE selects the relay node, a D2D communication connection is established with the relay node; the source UE determines the modulation and coding mode of the D2D communication according to the channel quality information carried in the discovery signal of the relay node.

In the embodiment of the present invention, after determining the relay node, the source UE can establish a communication connection with the relay node, and forward the information to the target node through the relay node.

Based on the same inventive concept, in the embodiment of the present invention, as shown in FIG. 4, the detailed process of determining the relay node by using the candidate relay node as the execution subject is as follows:

Step 401: The UE determines that it can serve as a candidate relay node between the source UE and the target node.

The source UE is any other UE in the communication range of the UE, or is a UE that sends a request discovery signal to the UE.

The target node may be a UE in D2D communication, or may be a network device.

Optionally, the UE determines a condition that the UE can serve as a candidate relay node between the source UE and the target node, and includes a combination of any one or more of the following conditions: the UE is configured by the network side to be the source UE and the network side. Communication waiting Selecting a relay node; the UE is authorized by the network side to be a candidate relay node for inter-UE communication; the UE is pre-configured to be a candidate relay node capable of inter-UE communication; the UE can simultaneously discover the source UE and the target node; The channel quality between the UE and the source UE and the channel quality between the UE and the target node satisfy a preset condition.

Optionally, before determining that the UE can serve as the candidate relay node between the source UE and the target node, the UE receives the request discovery signal sent by the source UE, where the request discovery signal carries the information of the source UE and the information of the target node.

Step 402: The UE measures channel quality information between itself and the target node and generates a discovery signal, where the discovery signal carries the channel quality information.

Optionally, the discovery signal further carries device information of the UE and/or relay capability indication information of the UE.

Optionally, the UE measures the synchronization signal, the reference signal, or the discovery signal sent by the target node to obtain channel quality information.

Specifically, if the target node is a network device, the UE satisfies a combination of any one or more of the following conditions: the UE is a trunk configured on the network side and capable of communicating with the network device as a UE outside the network coverage The UE of the node; or the UE is a UE that is located in the network coverage and can discover the source UE at the same time; or the channel quality between the UE and the source UE, and the channel quality between the UE and the network device meets Preset conditions.

Specifically, if the target node is a UE in D2D communication, the UE is satisfied. a combination of any one or more of the following conditions: the UE is a UE authorized by the network side to be a relay node for communication between UEs; or the UE is a pre-configured relay node capable of communicating between UEs UE; or, the UE can simultaneously discover the source UE and the target node; or the channel quality between the UE and the source UE and the channel quality between the UE and the target node satisfy a preset condition.

Optionally, the channel quality information includes, but is not limited to, a CQI, a received power value when the UE receives the signal of the target node, an SINR estimated value between the UE and the target node, and a signal measurement of the target node by the UE. A combination of any one or more of the obtained RSRPs.

Specifically, the UE measures the synchronization signal, the reference signal, or the discovery signal sent by the target node to obtain channel quality information. For example, if the target node is a network device, the channel quality information is the measured RSRP. If the target node is the UE, the channel quality information is the received power obtained by the UE measuring the synchronization signal or the discovery signal sent by the target node.

Step 403: The UE sends a discovery signal to the source UE, and the source UE determines, according to the discovery signal, whether the UE is selected as the relay node.

Optionally, the UE may broadcast the discovery signal; or after receiving the request discovery signal of the source UE, return a response signal to the source UE, where the response signal is a discovery signal, where the request discovery signal carries the information of the source UE. And information about the target node.

Optionally, the discovery signal further carries information about the UE itself, for example, device information of the UE, an identifier of the D2D communication of the UE, and the like.

Optionally, the source UE obtains the reception quality information (receive power or received signal to interference and noise ratio) of the discovery signal of each UE, and the quality of the channel carried in the discovery signal of the UE according to the received quality information of the discovery signal of the UE. Information to determine whether to select the UE as the source The relay node of the UE and the target node.

For example, the source UE may calculate the transmission efficiency of the candidate relay node according to the received signal to interference and noise ratio of the discovery signal of the candidate relay node and the channel quality information carried in the discovery signal of the candidate relay node; The maximum value of the transmission efficiency of the candidate relay node, and the candidate relay node corresponding to the maximum value is determined as the relay node.

In addition, the source UE may also perform judgment based on the pre-configured threshold. Only a certain measurement parameter, such as the channel quality information carried in the discovery signal, is greater than the pre-configured first threshold and/or the received quality of the discovery signal (received power). When the received signal to interference and noise ratio is greater than the pre-configured second threshold and/or the transmission efficiency is greater than the pre-configured third threshold, the corresponding candidate relay node can serve as the relay node.

The specific process of discovering and determining a relay node in the embodiment of the present invention is described in detail below through two specific embodiments.

In the first embodiment, in the scenario shown in FIG. 1, it is assumed that UE2 is the source UE, and the UE2 is not in the network coverage, but the UE2 wants to be able to communicate with the network device, and both UE1 and UE3 are in the network. Within the coverage, it is also within the communication range of UE2, and both UE1 and UE3 are authorized by the network side as candidate relay nodes.

The UE1 and the UE3 respectively broadcast and transmit a discovery signal, where the discovery signal carries its own device information (including a D2D identifier for D2D transmission) and relay capability indication information capable of relaying between the UE and the network, and carries The RSRP value obtained by measuring the signal transmitted by the network side.

The UE2 receives the discovery signals sent by the UE1 and the UE3, and obtains the device information, the relay capability indication information, and the RSRP value from each discovery signal. In this embodiment, the fake It is assumed that the RSRP value carried in the discovery signal of UE1 is represented as RSRP1, and the RSRP value carried in the discovery signal of UE3 is represented as RSRP3.

The UE2 measures the received power of the discovery signal of the UE1 and the UE3, respectively, and assumes that the received power of the discovery signal of the UE1 is RP1, and the received power of the discovery signal of the UE3 is RP3, and the UE2 carries the received power according to each discovery signal and each discovery signal. The RSRP value selects one UE as the relay node.

Specifically, the transmission efficiency of UE1 and UE3 is calculated separately, and the UE with the highest transmission efficiency is selected as the relay node. The calculation formula for transmission efficiency is: C _i = A log ₂ (1+ RP _i ) + B log ₂ (1+ RSRP _i )

A indicates a preset first weighting value, B indicates a preset second weighting value, C _i indicates the transmission efficiency of UEi, RP _i indicates the receiving power of UEi, and RSRP _i indicates the RSRP value carried in the discovery signal of UEi. .

Assuming that UE2 selects UE1 as the relay node, UE2 sends a request and establishes a communication connection with UE1, and UE2 implements data transmission with the network device through a communication connection with UE1 and a connection between UE1 and the network device.

In the second specific embodiment, as shown in the application scenario of FIG. 2, it is assumed that UE1, UE2, UE3, and UE4 are all outside the network coverage, UE2 is the source UE, and it is desirable to communicate with the target UE4, but UE4 is not in UE2. Within the communication range, UE1 and UE3 are both within the communication range of UE2 and UE4, and are both authorized to be candidate relay nodes.

The UE2 sends a request discovery signal, where the request discovery signal carries the information of the UE2 and the information of the target node UE4, and the information of the UE2 includes the device information of the UE2, the D2D identifier for the D2D transmission, the application information, and the like, and the information of the UE4 includes the device of the UE4. Information, for D2D identification, application information, etc. of D2D transmission.

UE1 and UE3 each receive the request discovery signal sent by UE2, and learn the information of UE2 and UE4.

UE1 and UE3 each discover UE4 through a D2D discovery procedure because UE2 and UE4 can be simultaneously discovered, and UE1 and UE3 determine candidate relay nodes that can serve as UE2 and UE4.

UE1 and UE3 each respond to the request discovery signal of UE2, and respond to UE2 with a discovery signal, which carries its own device information (including D2D identifier for D2D transmission), device information of UE2, and channel quality between itself and UE4. Information, the channel quality information is obtained by UE1 or UE3 measuring the synchronization signal or D2D discovery signal sent by UE4.

The UE2 receives the discovery signal sent by the UE1 and the UE3, and obtains the device information of the UE1 (including the D2D identifier for D2D transmission) and the channel quality information of the UE1 and the UE4 from the discovery signal of the UE1, and obtains the UE3 from the discovery signal of the UE3. Device information (including D2D identification for D2D transmission) and channel quality information for UE3 and UE4. In this embodiment, it is assumed that the channel quality information carried in the discovery signal of the UE1 is represented as CQ1, and the channel quality information carried in the discovery signal of the UE3 is represented as CQ3.

UE2 measures the received signal to interference and noise ratio of the discovery signals of UE1 and UE3, respectively, and assumes that the received signal to interference and noise ratio of the discovery signal of UE1 is represented as SINR1, and the received signal to interference and noise ratio of the discovery signal of UE3 is expressed as SINR3, combined with the discovery signal. Obtaining channel quality information of UE1 and UE4, channel quality information of UE3 and UE4, and selecting one of UE1 and UE3 as a relay node.

The specific selection method is: calculating the transmission efficiency of UE1 and UE3 separately, and selecting the UE with the highest transmission efficiency as the relay node. The calculation formula for transmission efficiency can be expressed as: C _i = A log ₂ (1+ SINR _i ) + B log ₂ (1+ snr _i )

A denotes a preset first weighting value, B denotes a preset second weighting value, C _i denotes a transmission efficiency of UEi, SINR _i denotes a received signal to interference and noise ratio of UEi, and snr _i denotes a discovery signal carried by UEi The channel quality information CQ _i corresponds to the signal to interference and noise ratio.

Assuming UE2 selects UE1 as the relay node, UE2 sends a communication request and establishes a communication connection with UE1. UE2 selects the size of the transmitted data packet according to the transmission efficiency of UE1, that is, selects the modulation coding mode used. The UE 2 communicates with the UE 4 through a communication connection with the UE 1 and a communication connection between the UE 1 and the UE 4.

Based on the same inventive concept, a UE is provided in the embodiment of the present invention. For the specific implementation of the UE, refer to the description of the source UE in the foregoing method part, and the repeated description is not repeated. As shown in FIG. 5, the UE mainly includes: The receiving unit 501 is configured to receive a discovery signal sent by the at least one candidate relay node, where the discovery signal carries channel quality information between the candidate relay node and the target node, and the processing unit 502 is configured to receive according to the receiving unit. Each of the discovery signals and the channel quality information carried in each of the discovery signals selects one of the at least one candidate relay node as the source UE and the relay node of the target node.

Optionally, the receiving unit 501 is configured to: detect a discovery signal sent by the at least one UE, and determine, according to the relay capability indication information carried in the discovery signal, whether the UE is a candidate relay node.

Optionally, the processing unit 502 is specifically configured to: Obtaining, respectively, the reception quality information of the discovery signal of each candidate relay node, according to the reception quality information of the discovery signal of the candidate relay node and the channel quality information carried in the discovery signal of the candidate relay node, from at least one One of the candidate relay nodes is selected as the source UE and the relay node of the target node.

Optionally, the target node is a UE in device-to-device (D2D) communication, or is a network device.

Optionally, the UE further includes a sending unit 503, configured to: before receiving the discovery signal sent by the candidate relay node, send a request discovery signal, where the request discovery signal carries information of the source UE and information of the target node.

Optionally, the channel quality information includes: a channel quality indicator (CQI), a received power value when the candidate relay node receives the signal of the target node, and a signal to interference and noise ratio between the candidate relay node and the target node. A (SINR) estimate, a combination of any one or more of Reference Signal Received Power (RSRP) obtained by the candidate relay node for signal measurement of the target node.

Optionally, the processing unit is further configured to: after selecting one of the at least one candidate relay node as the relay node of the source UE and the target node, establish a D2D communication connection with the relay node; The channel quality information carried in the discovery signal of the relay node determines the modulation and coding mode of the D2D communication.

Based on the same inventive concept, the present disclosure further provides another UE. For the specific implementation of the UE, refer to the description of the source UE in the foregoing method part, and the repeated description is not repeated. As shown in FIG. 6, the UE mainly includes: The transceiver 601 is configured to receive a discovery signal sent by the at least one candidate relay node, where the discovery signal carries channel quality information between the candidate relay node and the target node, and the processor 602 is configured to receive according to the transceiver 601. Each of the discovery signals and the channel quality information carried in each of the discovery signals are selected from at least one of the candidate relay nodes as a relay node of the source UE and the target node.

Optionally, the transceiver 601 detects the discovery signal sent by the at least one UE, and determines whether the UE is a candidate relay node according to the relay capability indication information carried in the discovery signal.

Optionally, the processor 602 separately obtains the reception quality information of the discovery signal of each candidate relay node, according to the reception quality information of the discovery signal of the candidate relay node and the discovery signal carried in the discovery signal of the candidate relay node. Channel quality information, selecting one of the at least one candidate relay node as the source UE and the relay node of the target node.

The target node is a UE in device-to-device (D2D) communication, or is a network device.

Optionally, before receiving the discovery signal sent by the candidate relay node, the transceiver 601 sends a request discovery signal, where the request discovery signal carries information about the source UE and information of the target node.

Optionally, the channel quality information includes: a channel quality indicator (CQI), a received power value when the candidate relay node receives the signal of the target node, and a signal to interference and noise ratio between the candidate relay node and the target node ( The SINR) estimate, a combination of any one or more of Reference Signal Received Power (RSRP) obtained by the candidate relay node for signal measurement of the target node.

Optionally, the processor 602 selects one of the at least one candidate relay node as the relay node of the source UE and the target node, and establishes a D2D communication connection with the relay node; according to the relay node The channel quality information carried in the discovery signal determines the modulation and coding mode of the D2D communication.

Based on the same inventive concept, another UE is further provided in the embodiment of the present invention. For the specific implementation of the UE, refer to the specific description in the foregoing method part about the UE that can serve as the relay node between the source UE and the target node, and repeat As shown in FIG. 7 , the UE mainly includes: a determining unit 701, configured to determine that the UE can serve as a candidate relay node between the source UE and the target node, and a generating unit 702, configured to measure the UE and The channel quality information between the target nodes generates a discovery signal, and the discovery signal carries the channel quality information. The sending unit 703 is configured to send the discovery signal to the source UE, and the source UE determines whether to select according to the discovery signal. The UE acts as a relay node.

The source UE is any other UE in the communication range of the UE, or is a UE that sends a request discovery signal to the UE.

The target node is a UE in device-to-device (D2D) communication, or is a network device.

Optionally, the determining unit 701 is specifically configured to: determine, by using any one or more of the following conditions, that the UE can serve as a candidate relay node between the source UE and the target node: The UE is configured by the network side as a candidate relay node capable of communicating with the network side as a source UE; the UE is authorized by the network side to be a candidate relay node for inter-UE communication; the UE is preconfigured to be capable of communicating between UEs. a candidate relay node; the UE can simultaneously discover the source UE and the target node; the channel quality between the UE and the source UE and the channel quality between the UE and the target node satisfy a preset condition.

Optionally, the receiving unit 704 is further configured to: before the determining unit determines that the UE can serve as a candidate relay node between the source UE and the target node, receive a request discovery signal sent by the source UE, where the request discovery signal is received. The information of the source UE and the information of the target node are carried in the information.

Optionally, the discovery signal further includes device information of the UE and/or relay capability indication information of the UE.

Optionally, the generating unit 702 is configured to: perform measurement on the synchronization signal, the reference signal, or the discovery signal sent by the target node, to obtain the channel quality information.

Optionally, the channel quality information includes: a channel quality indicator (CQI), a received power value when the UE receives the signal of the target node, and a signal to interference and noise ratio (SINR) estimated value between the UE and the target node, A combination of any one or more of Reference Signal Received Power (RSRP) obtained by the UE measuring the signal of the target node.

Based on the same inventive concept, another UE is further provided in the embodiment of the present invention. For the specific implementation of the UE, refer to the method part in the above method regarding the source UE and the target node. For a detailed description of the UE of the relay node, the repeated description is not repeated. As shown in FIG. 8 , the UE mainly includes: a processor 801, configured to determine that the UE can serve as a candidate between the source UE and the target node. a relay node, measuring channel quality information between the UE and the target node, and generating a discovery signal, the discovery signal carrying the channel quality information; and a transceiver 802, configured to send the discovery signal to the source UE, by the source The UE determines whether to select the UE as a relay node according to the discovery signal.

The source UE is any other UE in the communication range of the UE, or is a UE that sends a request discovery signal to the UE.

The target node is a UE in device-to-device (D2D) communication, or is a network device.

Optionally, the processor 801 determines, by using any one or a combination of the following conditions, that the UE can serve as a candidate relay node between the source UE and the target node: the UE is configured by the network side to be the source UE and the network side. a candidate relay node for communication; the UE is authorized by the network side to be a candidate relay node for inter-UE communication; the UE is preconfigured to be a candidate relay node capable of inter-UE communication; the UE can simultaneously discover the source UE and The target node; the channel quality between the UE and the source UE and the channel quality between the UE and the target node satisfy a preset condition.

Optionally, the transceiver 802 receives the request discovery sent by the source UE before the processor 801 determines that the UE can serve as a candidate relay node between the source UE and the target node. The signal, the request discovery signal carries information of the source UE and information of the target node.

Optionally, the discovery signal further includes device information of the UE and/or relay capability indication information of the UE.

Optionally, the processor 801 measures the synchronization signal, the reference signal, or the discovery signal sent by the target node to obtain the channel quality information.

Optionally, the channel quality information includes: a channel quality indicator (CQI), a received power value when the UE receives the signal of the target node, and a signal to interference and noise ratio (SINR) estimated value between the UE and the target node, A combination of any one or more of Reference Signal Received Power (RSRP) obtained by the UE measuring the signal of the target node.

Based on the foregoing technical solution, in the embodiment of the present invention, the source UE is selected from multiple candidates according to the discovery signal sent by each candidate relay node and the channel quality information between the candidate relay node and the target node carried in the discovery signal. The relay node is selected in the node, so that the channel quality information of the relay node and the target node is comprehensively considered when selecting the relay node, thereby ensuring the data transmission performance between the source UE and the target node.

Those skilled in the art will appreciate that embodiments of the present disclosure can be provided as a method, system, or computer program product. Thus, the present disclosure may take the form of a fully hardware embodiment, a fully software embodiment, or an embodiment combining soft and hardware aspects. Moreover, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk memory and optical memory, etc.) containing computer usable code.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each of the processes and/or blocks, and the flowcharts and/or A combination of processes and/or blocks in the block diagram. 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.

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

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Claims (18)

A method for determining a relay node, comprising: receiving, by a source user equipment, a discovery signal sent by at least one candidate relay node, where the discovery signal carries channel quality information between the candidate relay node and a target node; The device selects one of the at least one candidate relay node as the source user equipment and the relay node of the target node according to each of the discovery signal and the channel quality information carried in each of the discovery signals. The method for determining a relay node according to claim 1, wherein the source user equipment is configured from at least one candidate relay node according to each of the discovery signal and the channel quality information carried in each of the discovery signals. Selecting a relay node as the source user equipment and the target node, comprising: the source user equipment respectively acquiring the reception quality information of the discovery signal of each candidate relay node, according to the discovery signal of the candidate relay node And the channel quality information carried in the discovery signal of the candidate relay node, and selecting one of the at least one candidate relay node as the source user equipment and the relay node of the target node. The method for determining a relay node according to claim 1, wherein the target node is a user equipment in device-to-device communication, or is a network device. The method for determining a relay node according to any one of claims 1 to 3, wherein the channel quality information comprises: a channel quality indicator, a received power value when the candidate relay node receives a signal of the target node, Any one of a signal to interference and noise ratio estimate between the candidate relay node and the target node, and a reference signal received power obtained by the candidate relay node for signal measurement of the target node or A variety of combinations. A method for determining a relay node, comprising: determining, by a user equipment, a candidate relay node between a source user equipment and a target node; the user equipment measuring channel quality information between itself and the target node and generating The discovery signal carries the channel quality information; the user equipment sends the discovery signal to the source user equipment, and the source user equipment determines, according to the discovery signal, whether the user equipment is selected as the relay node. The method for determining a relay node according to claim 5, wherein the target node is a user equipment in device-to-device communication, or is a network device. The method for determining a relay node according to claim 5, wherein the user equipment determines a condition that can be a candidate relay node between the source user equipment and the target node, including any one or more of the following conditions: Combination: the user equipment is configured by the network side to be a candidate relay node capable of communicating with the network side of the source user equipment; the user equipment is authorized by the network side to be a candidate relay node for communication between user equipments The user equipment is pre-configured to be a candidate relay node for communication between user equipments; the user equipment can simultaneously discover the source user equipment and the target node; the user equipment and the source user equipment The quality of the channel and the quality of the channel between the user equipment and the target node meet the preset conditions. The method for determining a relay node according to claim 5, wherein the user equipment measures channel quality information between itself and the target node, and includes: a synchronization signal and a reference signal sent by the user equipment to the target node. Or find the signal to measure and get the channel quality information. The method for determining a relay node according to any one of claims 5-8, wherein the channel quality information comprises: a channel quality indicator, a received power value when the user equipment receives the signal of the target node, the use A combination of any one or more of the signal to interference and noise ratio estimate between the device and the target node, and the reference signal received power obtained by the user equipment for the signal measurement of the target node. A user equipment, comprising: a processor; and a memory connected to the processor through a bus interface, and configured to store programs and materials used by the processor when performing operations, when the processor calls and executes When the program and the data are stored in the memory, the following function module is implemented: a receiving unit, configured to receive a discovery signal sent by at least one candidate relay node, where the discovery signal carries the candidate relay node and the target node a channel quality information; a processing unit, configured to select one of the at least one candidate relay node as the one according to each of the discovery signal received by the receiving unit and the channel quality information carried in each of the discovery signals The source user device and the relay node of the target node. The user equipment of claim 10, wherein the processing unit is specifically configured to: Obtaining, respectively, the reception quality information of the discovery signal of each candidate relay node, according to the reception quality information of the discovery signal of the candidate relay node and the channel quality information carried in the discovery signal of the candidate relay node, from at least One of the candidate relay nodes is selected as the source user equipment and the relay node of the target node. The user equipment of claim 10, wherein the target node is a user equipment in device-to-device communication, or is a network device. The user equipment of any one of the preceding claims, wherein the channel quality information comprises: a channel quality indicator, a received power value when the candidate relay node receives the signal of the target node, the candidate relay A combination of a signal to interference and noise ratio estimate between the node and the target node, and a reference signal received power obtained by the candidate relay node for the signal measurement of the target node. A user equipment, comprising: a processor; and a memory connected to the processor through a bus interface, and configured to store programs and materials used by the processor when performing operations, when the processor calls and executes When the program and the data stored in the memory are implemented, the following function module is implemented: a determining unit, configured to determine that the user equipment can serve as a candidate relay node between the source user equipment and the target node; And measuring a channel quality information between the user equipment and the target node, and generating a discovery signal, where the discovery signal carries the channel quality information; The sending unit is configured to send the discovery signal to the source user equipment, and the source user equipment determines, according to the discovery signal, whether the user equipment is selected as the relay node. The user equipment of claim 14, wherein the target node is a user equipment in device-to-device communication, or is a network device. The user equipment of claim 14, wherein the determining unit is specifically configured to: determine, by using any one or more of the following conditions, that the user equipment can be a candidate between the source user equipment and the target node; Successive node: the user equipment is configured by the network side as a candidate relay node capable of communicating with the network side of the source user equipment; the user equipment is authorized by the network side to be a candidate relay node for communication between user equipments The user equipment is pre-configured to be a candidate relay node for communication between user equipments; the user equipment can simultaneously discover the source user equipment and the target node; the user equipment and the source user equipment The quality of the channel and the quality of the channel between the user equipment and the target node meet the preset conditions. The user equipment of claim 14, wherein the generating unit is configured to: measure a synchronization signal, a reference signal, or a discovery signal sent by the target node to obtain the channel quality information. The user equipment of any one of the preceding claims, wherein the channel quality information comprises: a channel quality indicator, a received power value when the user equipment receives a signal of the target node, a combination of the signal to interference and noise ratio between the user equipment and the target node, and any one or more of the reference signal received power obtained by the user equipment for the signal measurement of the target node.