WO2016026366A1

WO2016026366A1 - Method and device for determining relay nodes

Info

Publication number: WO2016026366A1
Application number: PCT/CN2015/085035
Authority: WO
Inventors: 陈文洪; 高秋彬; 彭莹; 赵锐
Original assignee: 电信科学技术研究院
Priority date: 2014-08-22
Filing date: 2015-07-24
Publication date: 2016-02-25
Also published as: CN105430633A; CN105430633B; TWI584669B; TW201608926A

Abstract

The present disclosure provides a method and device for determining relay nodes to determine the relay node between a source user equipment and a target node in order to ensure data transportation performance there between. The method is: the source user equipment receives discovering signals transmitted by at least one candidate relay node and the discovering signal carries channel quality information between the candidate relay node and the target node; the source user equipment selects one of at least one candidate relay node to be the relay node of the source user equipment and the target node according to each of the discovering signal and the channel quality information carried by the same.

Description

Method and device for determining relay node

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 201410419802.6, filed on Jan. 22, 2014, the entire content of

Technical field

The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a relay node.

Background technique

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 forwarding through a central node (ie, a base station). There is also no need to transmit information 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 on the LTE licensed frequency band. On the one hand, the advantages of D2D technology can be fully utilized, and 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".

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 of direct data transmission between D2D UEs through device-to-device communication connections. 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 acts as a Relay node, and UE1 forwards its own uplink and downlink signals. The communication between UE1 and UE2 is implemented through D2D communication, and the UE1 and the network communicate through the cellular communication. Now.

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 . UE2 forwards its own information through UE1 in order to communicate with UE4 that is not in its own communication range. UE1 and UE2, UE1 and 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 the signal after receiving the response discovery 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.

Summary of the invention

The present disclosure 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 solutions provided by the embodiments of the present disclosure are as follows:

In a first aspect, a method for determining a relay node is provided, including:

The source user equipment (UE) receives the 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 selecting, by the source UE, one of the at least one candidate relay node as the source UE and the target node according to each of the discovery signal and the channel quality information carried in each of the discovery signals. Relay node.

Optionally, the source UE receives the discovery signal sent by the at least one candidate relay node, including:

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.

Optionally, the source UE selects one of the at least one candidate relay node as the source UE and the location according to each of the discovery signal and the channel quality information carried in each of the discovery signals. The relay node of the target node includes:

Obtaining, by the source UE, the reception quality information of the discovery signal of each of the candidate relay nodes, respectively, according to the reception quality information of the discovery signal of the candidate relay node and the information carried in the discovery signal of the candidate relay node. Determining 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.

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 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 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, a reference signal received power (RSRP) obtained by signal measurement of the candidate relay node to 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 a D2D communication connection between the source UE and the relay node;

The source UE determines a 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, including:

The user equipment (UE) determines that it can serve as a candidate relay node between the source UE and the target node;

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;

And 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 a relay node.

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

Optionally, the UE determines a condition that can be 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 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 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 the determining that the UE 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 about 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 itself and the target node, including:

The UE measures a synchronization signal, a reference signal, or a 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 a signal of the target node, and a signal to interference and noise ratio between the UE and the target node ( SINR) an estimate of a combination of any one or more of reference signal received power (RSRP) obtained by signal measurement by the UE to the target node.

In a third aspect, a user equipment (UE) is provided, including:

a receiving unit, configured to receive a discovery signal sent by at least one candidate relay node, where the discovery The signal carries channel quality information between the candidate relay node and the target node;

a processing unit, configured to select one of the at least one candidate relay node 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 UE and the relay node of the target node.

Optionally, the receiving unit is specifically configured to:

And detecting, by the at least one UE, a discovery signal, and determining, 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:

Acquiring the reception quality information of the discovery signal of each of the candidate relay nodes, respectively, 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, as the relay node of the source UE and the target node, from the at least one candidate relay node.

Optionally, the method further includes a sending unit, configured to:

Before receiving the discovery signal sent by the candidate relay node, sending a request discovery signal, where the request discovery signal carries information of the source UE and information 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, establishing a D2D communication connection with the relay node;

Determining a modulation and coding scheme of the D2D communication according to the channel quality information carried in the discovery signal of the relay node.

In 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 the source UE and the 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, and determine, by the source UE, whether the UE is selected as a relay node according to the discovery signal.

Optionally, the determining unit is specifically configured to:

The UE can be determined as a candidate relay node between the source UE and the target node by using any one or a combination of the following conditions:

The UE can simultaneously discover the source UE and the target node;

Optionally, a receiving unit is further included, configured to:

Before the determining unit determines that the UE can be a candidate relay node between the source UE and the target node, receiving a request discovery signal sent by the source UE, where the request discovery signal carries the information of the source UE And information about the target node.

Optionally, the generating unit is specifically configured to:

The synchronization signal, the reference signal, or the discovery signal sent by the target node is measured 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 a signal of the target node, and a signal to interference and noise ratio between the UE and the target node ( SINR) an estimated value, a reference signal obtained by the UE measuring the signal of the target node A combination of any one or more of received power (RSRP).

In a fifth aspect, a user equipment is provided, including:

Processor;

a memory coupled to the processor via a bus interface and configured to store programs and data used by the processor in performing operations,

When the processor calls and executes the programs and data stored in the memory, the following functional modules are implemented:

a receiving unit, 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;

a processing unit, configured to select one of the at least one candidate relay node according to each of the discovery signal received by the receiving unit and the channel quality information carried in each of the discovery signals A source user equipment and a relay node of the target node.

In a sixth aspect, a user equipment is provided, including:

Processor;

a determining unit, configured to determine that the user equipment is a candidate relay node between the source user equipment and the target node;

a generating unit, configured to measure channel quality information between the user equipment 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 user equipment, where the source user equipment determines, according to the discovery signal, whether the user equipment is selected as a relay node.

Based on the foregoing technical solution, in the embodiment of the present disclosure, 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 the relay node is selected, and the data transmission performance between the source UE and the target node is ensured.

DRAWINGS

FIG. 1 is a schematic diagram of a scenario in which an existing UE communicates with a network through a relay;

2 is a schematic diagram of a scenario in which an existing UE communicates with other UEs through a relay;

3 is a schematic flowchart of a method for a source UE to determine a relay node according to an embodiment of the present disclosure;

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 disclosure;

FIG. 5 is a schematic structural diagram of a UE in an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of another UE according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of another UE according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of another UE in an embodiment of the present disclosure.

detailed description

The present disclosure will be further described in detail with reference to the accompanying drawings, in which FIG. 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 disclosure, 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 in the communication range of the source UE, and may 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, before the source UE receives the discovery signal sent by the at least one candidate relay node, the source UE sends a request discovery signal, where the request discovery signal carries the information of the active 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 determination manners:

The candidate relay node is a UE configured by the network side to be a relay node that communicates with the network device by the UE outside the network coverage; 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; Alternatively, the channel quality between the candidate relay node and the source UE, and the channel quality between the candidate relay node and the network device satisfy a preset condition.

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 determination manners:

The candidate relay node is a UE that is authorized by the network side to be a relay node for communication between UEs; or the candidate relay node is a pre-configured UE that can serve as a relay node for communication between UEs; or, a candidate relay The 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 of the UE and information of the target node.

Optionally, the discovery signal sent by the candidate relay node further carries its own information, for example, its own device information, its own D2D communication identifier, its own relay capability indication information, and the like.

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 the received power obtained by the candidate relay node measuring the synchronization signal sent by the target node or 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. Among them, the relay capability refers to The indication information is information for indicating 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 carried in the discovery signal sent by the UE indicates When the UE does not have a relay capability, the UE cannot be a candidate relay node.

Step 302: The source UE selects, according to each discovery signal and channel quality information carried in each discovery signal, a relay node that is a source UE and a target node from the at least one candidate relay node.

Optionally, the source UE separately obtains the reception quality information of the discovery signal of each candidate relay node, and the channel quality information carried in the discovery signal of the candidate relay node according to the reception quality information of 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 relay node of the target node. Specifically, the reception quality information may be reception power or reception signal to noise ratio.

Specifically, the source UE separately acquires the received power (or the received signal to noise ratio) of the discovery signal of each candidate relay node, according to the received power (or the received signal to noise ratio) of the discovery signal of the candidate relay node, and the candidate. Following the channel quality information carried in the discovery signal of the node, it is determined 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 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 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 for transmission efficiency can be expressed as:

C _i =A log ₂ (1+P ₁ )+B log ₂ (1+P ₂ )

Wherein P ₁ represents the received signal to noise ratio of the discovery signal, P ₂ represents the signal to 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 value, C _i represents transmission efficiency.

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 (reception). Power, received signal to noise ratio) greater than a pre-configured second threshold and/or transmission When the 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 adaptation adjustment according to 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 disclosure, after determining the relay node, the source UE may establish a communication connection with the relay node, and forward the information to the target node by using the relay node.

Based on the same inventive concept, in the embodiment of the present disclosure, as shown in FIG. 4, with the candidate relay node as the execution subject, the detailed process of determining the relay node 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 can be a candidate relay node between the source UE and the target node, including a combination of any one or more of the following conditions:

The UE is authorized by the network side to be a candidate relay node for communication between UEs;

The UE can simultaneously discover the source UE and the target node;

Optionally, the UE determines that it can serve as a candidate relay node between the source UE and the target node, and receives a request discovery signal sent by the source UE, where the request discovery signal carries information of the active UE and 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 UE that is configured as a relay node that can communicate with the network device by the UE outside the network coverage; 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 UE The channel quality with the source UE and the channel quality between the UE and the network device satisfy a preset condition.

Specifically, if the target node is a UE in D2D communication, the UE satisfies a combination of any one or more of the following conditions:

The UE is a UE that is authorized by the network side to be a relay node for communication between UEs; or the UE is a pre-configured UE that can serve as a relay node for communication between UEs; 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 the UE A combination of any one or more of the RSRPs obtained by the signal measurement of the target node.

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 separately acquires the reception quality information of the discovery signal of each UE (reception power) Or receiving the signal-to-noise ratio, determining whether the UE is selected as the source UE and the relay node of the target node according to the reception quality information of the discovery signal of the UE and the channel quality information carried in the discovery signal of the UE.

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 (reception). When the power and the received signal to noise ratio are greater than the preconfigured second threshold and/or the transmission efficiency is greater than the preconfigured 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 embodiments of the present disclosure will be described in detail below through two specific embodiments.

In the first embodiment, as shown in Figure 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 within the network 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 pair. The signal transmitted by the network side is measured by the RSRP value obtained.

The UE2 receives the discovery signal 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, it is assumed that the RSRP value carried in the discovery signal of the UE1 is represented as RSRP1, UE3. The RSRP value carried in the discovery signal is expressed 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 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, D2D identification for D2D transmission, application information, etc.

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 the discovery signal to UE2, 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 transmitted 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 of UE3 and UE4. In this particular embodiment, false It is assumed that the channel quality information carried in the discovery signal of UE1 is represented as CQ1, and the channel quality information carried in the discovery signal of UE3 is represented as CQ3.

UE2 measures the received signal to noise ratio of the discovery signals of UE1 and UE3, respectively, assuming that the received signal to noise ratio of the discovery signal of UE1 is represented as SINR1, and the received signal to noise ratio of the discovery signal of UE3 is represented as SINR3, combined with UE1 obtained from the discovery signal. With channel quality information of UE4, channel quality information of UE3 and UE4, one of UE1 and UE3 is selected 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 noise ratio of UEi, and snr _i denotes a signal carried in the discovery signal of UEi The signal to noise ratio value corresponding to the channel quality information CQ _i .

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 disclosure. 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;

The processing unit 502 is configured to select one of the at least one candidate relay node 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 UE and the relay node of the target node.

Optionally, the receiving unit 501 is specifically configured to:

Optionally, the processing unit 502 is specifically configured to:

Obtaining, respectively, the reception quality information of the discovery signal of each of the candidate relay nodes, according to the Selecting one of the at least one candidate relay node as the source UE and the received 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 The relay node of the target node.

Optionally, the UE further includes a sending unit 503, configured to:

Optionally, the processing unit is further configured to:

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;

The processor 602 is configured to select one of the at least one candidate relay node according to each of the discovery signal received by the transceiver 601 and the channel quality information carried in each of the discovery signals. The source UE and a relay node of 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 acquires the reception quality information of the discovery signal of each of the candidate relay nodes, according to the reception quality information of the discovery signal of the candidate relay node, and the candidate. Following the channel quality information carried in the discovery signal of the node, one of the at least one candidate relay node is selected 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 the information of the source UE and the 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 letter between the candidate relay node and the target node. A combination of any one or more of a dry noise ratio (SINR) estimate, a reference signal received power (RSRP) obtained by signal measurement of the candidate relay node to the target node.

Optionally, the processor 602 selects one of the at least one candidate relay node as the source UE and the relay node of the target node, and establishes a D2D communication connection with the relay node;

Based on the same inventive concept, another UE is further provided in the embodiment of the present disclosure. 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 The details are not described here. As shown in FIG. 7, the UE mainly includes:

a determining unit 701, configured to determine that the UE is a candidate relay node between the source UE and the target node;

The generating unit 702 is 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;

The sending unit 703 is configured to send the discovery signal to the source UE, and determine, by the source UE, whether the UE is selected as a relay node according to the discovery signal.

Optionally, the determining unit 701 is specifically configured to:

The UE can simultaneously discover the source UE and the target node;

Optionally, the method further includes a receiving unit 704, configured to:

Optionally, the generating unit 702 is specifically configured to:

Based on the same inventive concept, another UE is further provided in the embodiment of the present disclosure. 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 The details are not described here. As shown in FIG. 8, the UE mainly includes:

The processor 801 is configured to determine that the UE is a candidate relay node between the source UE and the target node, measure channel quality information between the UE and the target node, and generate a discovery signal, where the discovery signal is Carrying the channel quality information;

The transceiver 802 is configured to send the discovery signal to the source UE, and determine, by the source UE, whether the UE is selected as a relay node according to the discovery signal.

Optionally, the processor 801 determines that the UE can serve as a candidate relay node between the source UE and the target node by using any one or a combination of the following conditions:

The UE can simultaneously discover the source UE and the target node;

Optionally, the transceiver 802 receives a request discovery signal 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, where the request discovery signal carries Information of the source UE and information of the target node.

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.

Those skilled in the art will appreciate that embodiments of the present disclosure may be provided as a method, system, or Computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software 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 storage and optical storage, etc.) including computer usable program code.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present disclosure. 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, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

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

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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

Claims

A method for determining a relay node, comprising:

The source user equipment receives the 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 selecting, by the source user equipment, one of the at least one candidate relay node as the source user equipment and the target according to each of the discovery signal and the channel quality information carried in each of the discovery signals. The relay node of the node.
The method of claim 1, wherein the source user equipment receives the discovery signal sent by the at least one candidate relay node, including:

The source user equipment detects the discovery signal sent by the at least one user equipment, and determines whether the user equipment is a candidate relay node according to the relay capability indication information carried in the discovery signal.
The method of claim 1, wherein the source user equipment selects from 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. A relay node as the source user equipment and the target node includes:

Obtaining, by the source user equipment, 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 of the candidate relay node. The channel quality information is selected from the at least one candidate relay node as a relay node of the source user equipment and the target node.
The method of claim 1 wherein the target node is a user device in device-to-device communication or a network device.
The method of claim 1, wherein before the source user equipment receives the discovery signal sent by the candidate relay node, the method further includes:

The source user equipment sends a request discovery signal, where the request discovery signal carries information of the source user equipment and information of the target node.
The method according to any one of claims 1 to 5, 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, and the candidate a signal to interference and noise ratio estimate between the node and the target node, the candidate relay section A combination of any one or more of reference signal received power obtained by measuring the signal of the target node.
The method of claim 1, wherein after the source user equipment selects one of the at least one candidate relay node as the source user equipment and the relay node of the target node, the method further includes :

Establishing a device-to-device communication connection between the source user equipment and the relay node;

The source user equipment determines a modulation and coding mode of device-to-device communication according to channel quality information carried in the discovery signal of the relay node.
A method for determining a relay node, comprising:

The user equipment determines that it can serve as a candidate relay node between the source user equipment and the target node;

The user equipment measures channel quality information between itself and the target node, and generates a discovery signal, where 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 a relay node.
The method of claim 8, wherein the source user equipment is any other user equipment within the communication range of the user equipment or is a user equipment that sends a request discovery signal to the user equipment.
The method of claim 8 wherein the target node is a user device in device-to-device communication or a network device.
The method of claim 8, wherein the user equipment determines a condition that it can serve as a candidate relay node between the source user equipment and the target node, including a combination of any one or more of the following conditions:

The user equipment is configured by the network side as a candidate relay node capable of communicating with the network side as a 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 preconfigured to be a candidate relay node capable of communication between user equipments;

The user equipment can simultaneously discover the source user equipment and the target node;

The channel quality between the user equipment and the source user equipment and the channel quality between the user equipment and the target node satisfy a preset condition.
The method of claim 8, wherein the method further comprises: before the user equipment determines that it can be a candidate relay node between the source user equipment and the target node, the method further comprising:

The user equipment receives the request discovery signal sent by the source user equipment, where the request discovery signal carries information of the source user equipment and information of the target node.
The method of claim 8, wherein the discovery signal further comprises device information of the user equipment and/or relay capability indication information of the user equipment.
The method of claim 8, wherein the user equipment measures channel quality information between itself and the target node, including:

The user equipment measures a synchronization signal, a reference signal, or a discovery signal sent by the target node to obtain the channel quality information.
The method according to any one of claims 8 to 14, 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, the user equipment and the And a combination of any one or more of a signal to interference and noise ratio estimation value between the target nodes and a reference signal received power obtained by the user equipment on the signal measurement of the target node.
A user equipment comprising:

a receiving unit, 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;

a processing unit, configured to select one of the at least one candidate relay node according to each of the discovery signal received by the receiving unit and the channel quality information carried in each of the discovery signals A source user equipment and a relay node of the target node.
The user equipment of claim 16, wherein the receiving unit is specifically configured to:

And detecting, by the at least one user equipment, a discovery signal, and determining, according to the relay capability indication information carried in the discovery signal, whether the user equipment is a candidate relay node.
The user equipment of claim 16, wherein the processing unit is specifically configured to:

Acquiring the reception quality information of the discovery signal of each of the candidate relay nodes, respectively, 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 user equipment and the relay node of the target node.
The user equipment of claim 16, wherein the target node is a device to device User equipment in communication, or a network device.
The user equipment of claim 16, further comprising a sending unit, configured to:

Before receiving the discovery signal sent by the candidate relay node, sending a request discovery signal, where the request discovery signal carries information of the source user equipment and information of the target node.
The user equipment according to any one of claims 16 to 20, 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, and the candidate a combination of a signal to interference and noise ratio estimate between the 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.
The user equipment of claim 16, wherein the processing unit is further configured to:

After selecting one of the at least one candidate relay node as the source user equipment and the target node, establishing a device-to-device communication connection with the relay node;

Determining a modulation and coding mode of device-to-device communication according to channel quality information carried in the discovery signal of the relay node.
A user equipment comprising:

a determining unit, configured to determine that the user equipment is a candidate relay node between the source user equipment and the target node;

a generating unit, configured to measure channel quality information between the user equipment 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 user equipment, where the source user equipment determines, according to the discovery signal, whether the user equipment is selected as a relay node.
The user equipment according to claim 23, wherein the source user equipment is any other user equipment within the communication range of the user equipment, or is a user equipment that sends a request discovery signal to the user equipment.
The user equipment of claim 23, wherein the target node is a user equipment in device-to-device communication or a network device.
The user equipment of claim 23, wherein the determining unit is specifically configured to:

The user equipment can be determined as a candidate relay node between the source user equipment and the target node by using any one or a combination of the following conditions:

The user equipment is configured by the network side as a candidate relay node capable of communicating with the network side as a 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 preconfigured to be a candidate relay node capable of communication between user equipments;

The user equipment can simultaneously discover the source user equipment and the target node;

The channel quality between the user equipment and the source user equipment and the channel quality between the user equipment and the target node satisfy a preset condition.
The user equipment of claim 23, further comprising a receiving unit, configured to:

Before the determining unit determines that the user equipment can serve as a candidate relay node between the source user equipment and the target node, receiving a request discovery signal sent by the source user equipment, where the request discovery signal carries the source Information of the user equipment and information of the target node.
The user equipment of claim 23, wherein the discovery signal further comprises device information of the user equipment and/or relay capability indication information of the user equipment.
The user equipment of claim 23, wherein the generating unit is specifically configured to:

The synchronization signal, the reference signal, or the discovery signal sent by the target node is measured to obtain the channel quality information.
The user equipment according to any one of claims 23 to 29, 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, and the user equipment and a combination of a signal to interference and noise ratio estimate between the target nodes, and a reference signal received power obtained by the user equipment for the signal measurement of the target node.
A user equipment comprising:

Processor;

a memory coupled to the processor via a bus interface and configured to store programs and data used by the processor in performing operations,

When the processor calls and executes the programs and data stored in the memory, the following functional modules are implemented:

a receiving unit, 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;

a processing unit, configured to select one of the at least one candidate relay node according to each of the discovery signal received by the receiving unit and the channel quality information carried in each of the discovery signals A source user equipment and a relay node of the target node.
A user equipment comprising:

Processor;

a memory coupled to the processor via a bus interface and configured to store programs and data used by the processor in performing operations,

When the processor calls and executes the programs and data stored in the memory, the following functional modules are implemented:

a determining unit, configured to determine that the user equipment is a candidate relay node between the source user equipment and the target node;

a generating unit, configured to measure channel quality information between the user equipment 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 user equipment, where the source user equipment determines, according to the discovery signal, whether the user equipment is selected as a relay node.