WO2016184273A1

WO2016184273A1 - Relay selection and discovery method, device and system

Info

Publication number: WO2016184273A1
Application number: PCT/CN2016/078866
Authority: WO
Inventors: 袁明; 吴栓栓; 卢有雄; 黄双红; 杨瑾; 王文焕
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-05-15
Filing date: 2016-04-08
Publication date: 2016-11-24
Also published as: CN106304258A

Abstract

Disclosed are a relay selection and discovery method, device and system. The method comprises: measuring, by a terminal, link quality between the terminal and a base station; and acting, by the terminal, as a relay terminal to transmit a corresponding relay discovery signal when the link quality satisfies a first preset threshold.

Description

Method, device and system for relay selection and discovery

Technical field

This application relates to, but is not limited to, the field of communications.

Background technique

The cellular communication system has realized the multiplex of limited spectrum resources, so that the wireless communication technology has been vigorously developed. In a cellular system, when there is a service between two user equipments (UEs), the service data of the user equipment 1 (UE1) to the user equipment 2 (UE2) is first transmitted to the UE1 through the air interface. A base station (also referred to as an eNB) of the cell in which the base station transmits the user data to the base station of the cell where the UE2 is located, and the base station transmits the service data to the UE2 through the air interface. The service data transmission from UE2 to UE1 adopts a similar processing flow. 1 is a schematic diagram of cellular communication when a UE is located in the same base station cell in the related art. As shown in FIG. 1, when UE1 and UE2 are located in the same cell, although two UEs are covered by a cell of the same base station, one data transmission is performed. Two wireless spectrum resources will still be consumed.

If the user equipment 1 and the user equipment 2 are located in the same cell and are close together, then the above-described cellular communication method is obviously not the optimal communication method. With the diversification of mobile communication services, for example, social networking, electronic payment and the like are more and more widely used in wireless communication systems, so that the demand for service transmission between close-range users is increasing. Therefore, the communication mode of Device-to-Device (D2D) has received increasing attention.

2 is a schematic diagram of a D2D communication system in the related art. As shown in FIG. 2, service data is not forwarded by a base station, and is directly transmitted by a source user equipment to a target user equipment through an air interface, and may also be referred to as a proximity service (Proximity Service). , referred to as ProSe). This communication mode is different from the communication mode of a conventional cellular system. For users of short-range communication, D2D not only saves wireless spectrum resources, but also reduces the data transmission pressure of the core network. Cellular network-based D2D communication is a new technology that directly communicates between multiple D2D-enabled terminal devices under the control of the system. It can reduce system resource consumption, increase the spectrum efficiency of cellular communication systems, and reduce terminal transmission. Power consumption, and to a large extent save network operating costs.

The technical types of D2D include discovery and communication, where discovery includes Type 1 (Type 1) and Type 2 (Type 2) types, and communication includes mode 1 (mode 1) and mode 2 (mode 2). Two types. Long Term Evolution (LTE) discussed in the 3rd Generation Partnership Project (3GPP) Radio Access Network Work Group 1, RAN1 In Release 12 (Release 12, R12 for short), the applicable scenarios of communication include network coverage, network coverage, and network half coverage scenarios. For discovery, it only applies to the inner scene.

In the related art, a requirement of Type 1 discovery in a half coverage scenario and an out-of-coverage scenario is proposed, and a typical application is to act as a UE-to-network relay.

One case of acting as a UE-to-network relay is that in a half-coverage scenario, an intra-coverage D2D UE acts as a relay to provide services for an out-of-band D2D UE.

3 is a schematic diagram of a UE-to-network relay communication scenario in the related art. As shown in FIG. 3, an in-band D2D UE A (also referred to as a relay UE) is an out-of-band D2D UE B (also referred to as The remote remote terminal (remote UE) provides relay service, and performs control and data relay between the base station and the D2D UE B. The D2D UE A and the base station are Uu interfaces of the LTE cellular network, which substantially assume the role of a wireless backhaul link; the D2D UE A and the D2D UE B communicate on the system uplink resources in a D2D manner. There is a side link between them (Sidelink). At this time, the D2D UE A acts as a relay UE, and actually achieves the function of extending the coverage of the cellular network. Through the Sidelink transmission between the D2D UE A and the D2D UE B, the connection communication between the network side and the external user is realized.

Another case of UE-to-network relay is that the intra-coverage D2D UE acts as a relay to provide services for the in-coverage D2D UE. As shown in FIG. 3, the in-band D2D UE A (also referred to as a relay UE) provides a relay service for the in-band D2D UE C (also referred to as an in-cover remote UE), and performs control and data between the base station and the D2D UE C. Relay forwarding.

In order to achieve the above functions, the problem that must be solved is how to select a suitable in-coverage D2D UE to act as a relay UE, and how to implement mutual discovery between the remote UE and the relay UE.

For the related art, the control transmission and data between the base station and the remote terminal in the semi-coverage scenario The problem of transmission has not yet been proposed as an effective solution.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

This paper provides a method, device and system for relay selection and discovery to solve at least the problem of control transmission and data transmission between a base station and a remote terminal in a semi-coverage scenario.

A method of relay selection and discovery, including:

The terminal measures the link quality between the terminal and the base station;

If the link quality meets the first threshold, the terminal acts as a relay terminal to send a corresponding relay discovery signal.

Optionally, the link quality includes at least one of the following:

The terminal receives the power RSRP according to the reference signal calculated by the pilot transmitted by the base station;

The terminal receives the quality RSRQ according to the reference signal calculated by the pilot transmitted by the base station;

The signal calculated by the terminal according to the pilot transmitted by the base station and the interference plus noise ratio SINR;

The path loss calculated by the terminal according to the pilot transmitted by the base station.

Optionally, in a case that the first threshold includes a first upper limit value and/or a first lower limit value, the case where the link quality meets the first threshold value includes at least one of the following:

a terminal whose link link quality between the terminal and the base station is greater than the first lower limit value and smaller than the first upper limit value;

The link quality of the backhaul link between the terminal and the base station is greater than the terminal of the first lower limit.

Optionally, the first upper limit value and/or the first lower limit value include at least one of the following:

The first upper limit value and/or the first lower limit value predefined in the protocol;

The first upper limit value and/or the first lower limit value preconfigured on the network side;

Threshold in the current system.

Optionally, the relay discovery signal includes at least one of the following:

Identification information of the terminal;

Link information between the terminal and the base station.

Optionally, the method further includes:

The relay discovery signal is sent on a pre-configured relay discovery resource or on a relay discovery resource configured by the base station.

Optionally, the method further includes:

a terminal that satisfies the first threshold corresponding to the link quality, and sends a request for the terminal to act as a relay base station to the base station;

The terminal receives a relay terminal selection decision of the base station, and selects the terminal to serve as a relay terminal according to the relay terminal selection decision, wherein the information determining the relay terminal selection decision includes at least one of the following: the terminal and the The uplink quality information of the backhaul link between the base stations, the mobility information of the terminal, and the power information of the terminal.

Optionally, the request that the terminal acts as a relay terminal is carried on a physical uplink control channel PUCCH or a physical uplink traffic channel PUSCH.

A method of relay selection and discovery, including:

The remote terminal monitors the relay discovery signal sent by the terminal, selects the relay terminal according to the relay discovery signal, and sends a corresponding request message to the relay terminal; wherein the request information is used by the relay terminal to request the base station Following the transmission.

Optionally, the remote terminal monitors the relay discovery signal sent by the terminal, and selects the relay terminal according to the relay discovery signal, including one of the following:

The remote terminal measures the link quality between the remote terminal and the relay terminal, and selects a relay terminal that meets the second threshold according to the quality of the link;

The remote terminal randomly selects a relay terminal in the relay terminal;

The remote terminal selects the relay terminal with the best link quality.

Optionally, the link quality includes at least one of the following:

The remote terminal receives the reference signal calculated according to the pilot or data symbol sent by the relay terminal Power RSRP;

The reference signal received by the remote terminal according to the pilot or data symbol transmitted by the relay terminal receives the quality RSRQ;

The signal to interference plus noise ratio SINR calculated by the remote terminal according to the pilot or data symbol sent by the relay terminal;

The path loss calculated by the remote terminal according to the pilot or data symbol transmitted by the relay terminal.

Optionally, in the case that the second threshold includes a second lower limit, the selecting the relay terminal that meets the second threshold includes:

The relay terminal of the side link of the relay terminal is selected to be greater than the second lower limit.

Optionally, the second lower limit value includes at least one of the following:

The second lower limit value predefined in the protocol;

The second lower limit value preconfigured on the network side;

Threshold in the current system.

Optionally, the request information sent by the remote terminal to the relay terminal is carried by the discovery channel;

The request message includes at least one of the following: a proximity service relay terminal identity ID, a public land mobile network identity ID, and an identity ID type.

A method of relay selection and discovery, including:

The base station selects a relay terminal for the remote terminal according to the information of the relay terminal;

The base station sends feedback information carrying the relay terminal information to the remote terminal.

Optionally, before the base station selects a relay terminal for the remote terminal according to the information of the relay terminal, the method includes:

When the remote terminal is located outside the network coverage, the base station receives a relay terminal candidate set and/or a link link status of the relay terminal that is forwarded by the relay terminal using the physical uplink control channel PUSCH, and the relay terminal candidate set And/or the link status of the edge link is that the remote terminal sends to the relay terminal by using the discovery channel;

When the remote terminal is located in the network coverage, the base station receives a link terminal candidate set and/or a link link status of the remote terminal using the physical uplink control channel PUSCH.

Optionally, the feedback information includes at least one of the following:

The remote terminal identifies the ID information, and the relay terminal is adjacent to the service identity information.

A device for relay selection and discovery, located on the terminal side, comprising:

a measuring module, configured to: measure a link quality between the terminal and the base station;

The first sending module is configured to: when the link quality meets the first threshold, the terminal acts as a relay terminal to send a corresponding relay discovery signal.

A device for relay selection and discovery, located on the remote terminal side, includes:

The monitoring module is configured to: monitor a relay discovery signal sent by the terminal;

The first selection module is configured to: select a relay terminal according to the relay discovery signal, and send a corresponding request message to the relay terminal, wherein the request information is used by the relay terminal to request a relay transmission from the base station.

A device for relay selection and discovery, located at the base station side, includes:

a second selection module, configured to: select a relay terminal for the remote terminal according to the information of the relay terminal;

The second sending module is configured to: send feedback information carrying the relay terminal information to the remote terminal.

A system for relay selection and discovery, comprising: a terminal, a remote terminal, a relay terminal, and a base station;

The terminal is configured to: measure a link quality between the terminal and the base station, where the terminal is within the network coverage; if the link quality meets the first threshold, the terminal acts as the relay terminal to send the corresponding Relay discovery signal;

The remote terminal is configured to: monitor the relay discovery signal, select a relay terminal according to the relay discovery signal, and send a corresponding request message to the relay terminal, where the request information is used by the relay terminal to The base station requests a relay transmission.

A computer readable storage medium storing computer executable instructions for performing the method of any of the above.

According to the embodiment of the present invention, the terminal is used to measure the link quality between the terminal and the base station, and the chain When the path quality meets the first threshold, the terminal acts as a relay terminal to send a corresponding relay discovery signal, which solves the problem of control transmission and data transmission between the base station and the remote terminal in the semi-coverage scenario, and implements the network side. Communicate with the connection of the external terminal.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic diagram of cellular communication when UEs are located in the same base station cell in the related art;

2 is a schematic diagram of a D2D communication system in the related art;

3 is a schematic diagram of a UE-to-network relay communication scenario in the related art;

4 is a flowchart 1 of a method for relay selection and discovery according to an embodiment of the present invention;

FIG. 5 is a second flowchart of a method for relay selection and discovery according to an embodiment of the present invention; FIG.

6 is a flowchart 3 of a method for relay selection and discovery according to an embodiment of the present invention;

7 is a structural block diagram 1 of an apparatus for relay selection and discovery according to an embodiment of the present invention;

FIG. 8 is a structural block diagram 2 of an apparatus for relay selection and discovery according to an embodiment of the present invention; FIG.

9 is a structural block diagram 3 of an apparatus for relay selection and discovery according to an embodiment of the present invention;

10 is a first schematic diagram of a relay selection and discovery process according to an embodiment of the present invention;

11 is a second schematic diagram of a relay selection and discovery process according to an embodiment of the present invention;

FIG. 12 is a third schematic diagram of a relay selection and discovery process according to an embodiment of the present invention; FIG.

FIG. 13 is a fourth schematic diagram of a relay selection and discovery process according to an embodiment of the present invention; FIG.

14 is a schematic diagram 5 of a relay selection and discovery process according to an embodiment of the present invention;

15 is a sixth diagram of a relay selection and discovery flow in accordance with an embodiment of the present invention.

Embodiments of the invention

Embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It should be noted that the terms "first", "second" and the like in the specification and claims of the present specification and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or order.

In this embodiment, a method for relay selection and discovery is provided. FIG. 4 is a flowchart 1 of a method for relay selection and discovery according to an embodiment of the present invention. As shown in FIG. 4, the process includes the following steps. step:

Step S402, the terminal measures the link quality between the terminal and the base station;

Step S404: If the link quality meets the first threshold, the terminal acts as a relay terminal to send a corresponding relay discovery signal.

Through the above steps, the terminal measures the link quality between the terminal and the base station. If the link quality meets the first threshold, the terminal acts as a relay terminal to send a corresponding relay discovery signal, and solves the base station in the half coverage scenario. The problem of control transmission and data transmission between the remote terminal and the remote terminal enables communication between the network side and the external terminal.

In this embodiment, the link quality may include:

The reference signal receiving power (Reference Signal Receiving Power, referred to as RSRP) calculated by the terminal according to the pilot transmitted by the base station;

The reference signal receiving quality (Reference Signal Receiving Quality, referred to as RSRQ) calculated by the terminal according to the pilot transmitted by the base station;

The signal calculated by the terminal according to the pilot transmitted by the base station and the interference plus noise ratio (Signal to Interference plus Noise Ratio, referred to as SINR);

In this embodiment, in a case that the first threshold range includes a first upper limit value and/or a first lower limit value, the case where the link quality meets the first threshold value includes at least one of the following:

In this embodiment, the first upper limit value and/or the first lower limit value include at least one of the following: The first upper limit value and/or the first lower limit value predefined in the discussion; the first upper limit value and/or the first lower limit value preconfigured on the network side; a threshold value in the current system.

In this embodiment, the relay discovery signal includes at least one of: identity identification information of the terminal; link information between the terminal and the base station.

In this embodiment, the relay discovery signal is sent on a pre-configured relay discovery resource, or is sent on a relay discovery resource configured by the base station.

In this embodiment, the terminal that meets the first threshold corresponding to the link quality sends a request to the base station to act as a relay base station;

The terminal receives the relay terminal selection decision of the base station, and selects the terminal in the terminal to act as the relay terminal according to the relay terminal selection decision, wherein the information determining the relay terminal selection decision includes at least one of the following: the terminal and the base station The uplink quality information between the backhaul link, the mobility information of the terminal, and the terminal power information.

In this embodiment, the request of the terminal to act as a relay terminal is carried on a Physical Uplink Control CHannel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

In this embodiment, a method for relay selection and discovery is provided. FIG. 5 is a second flowchart of a method for relay selection and discovery according to an embodiment of the present invention. As shown in FIG. 5, the process includes the following steps. step:

Step S502: The remote terminal monitors the relay discovery signal sent by the terminal.

Step S504, selecting a relay terminal according to the relay discovery signal, and transmitting a corresponding request message to the relay terminal, wherein the request information is used by the relay terminal to request a relay transmission from the base station.

Through the above steps, the remote terminal monitors the relay discovery signal sent by the terminal, selects the relay terminal according to the relay discovery signal, and sends a corresponding request message to the relay terminal, where the request information is used for the relay terminal. Requesting the relay transmission to the base station solves the problem of control transmission and data transmission between the base station and the remote terminal in the semi-coverage scenario, and realizes the connection communication between the network side and the coverage terminal.

In this embodiment, the remote terminal monitors the relay discovery signal sent by the terminal, and selects the relay terminal according to the relay discovery signal to include one of the following:

The remote terminal randomly selects a relay terminal in the relay terminal;

The remote terminal selects the relay terminal with the best link quality.

In this embodiment, the link quality includes at least one of the following:

The remote terminal receives the power RSRP according to the reference signal calculated by the pilot or the data symbol transmitted by the relay terminal;

In this embodiment, in the case that the second threshold range includes a second lower limit, the selecting the relay terminal that satisfies the second threshold includes: selecting a chain of side links of the relay terminal The relay terminal whose road quality is greater than the second lower limit value.

In this embodiment, the second lower limit value includes at least one of the following: a second lower limit value predefined in the protocol; the second lower limit value preconfigured on the network side; and a threshold value in the current system.

In this embodiment, the request information sent by the remote terminal to the relay terminal is carried by the discovery channel; wherein the request message includes at least one of the following: a proximity service relay terminal identity ID, and a public land mobile network identity identifier. ID, identity ID type.

In this embodiment, a method for relay selection and discovery is provided. FIG. 6 is a flowchart 3 of a method for relay selection and discovery according to an embodiment of the present invention. As shown in FIG. 6, the process includes the following steps. step:

Step S602, the base station selects a relay terminal for the remote terminal according to the information of the relay terminal.

Step S604, the base station sends feedback information carrying the relay terminal information to the remote terminal.

Through the above steps, the base station selects a relay end for the remote terminal according to the information of the relay terminal. The base station sends the feedback information carrying the relay terminal information to the remote terminal, and solves the problem of control transmission and data transmission between the base station and the remote terminal in the semi-coverage scenario, and implements network side and coverage. The connection of the external terminal is communicated.

In this embodiment, before the base station selects a relay terminal for the remote terminal according to the information of the relay terminal, the base station includes:

When the remote terminal is located outside the network coverage, the base station receives a relay terminal candidate set and/or a link link status of the relay terminal that is forwarded by the relay terminal using the physical uplink control channel PUSCH, and the relay terminal candidate set And/or the link status of the side link is that the remote terminal transmits to the relay terminal by using a discovery channel;

When the remote terminal is located in the network coverage, the base station receives the relay terminal candidate set and/or the side link link status of the remote terminal using the physical uplink control channel PUSCH.

In this embodiment, the feedback information includes at least one of the following: the remote terminal identity ID (identity) information, and the relay terminal proximity service (ProSe) identity information.

The embodiment of the invention further provides a computer readable storage medium storing computer executable instructions for performing the above method of relay selection and discovery.

In this embodiment, a device for relay selection and discovery is also provided, which is used to implement the above-mentioned embodiments and optional embodiments, and has not been described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the devices described in the following embodiments may be implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 7 is a structural block diagram of an apparatus for relay selection and discovery according to an embodiment of the present invention. As shown in FIG. 7, the apparatus is located on a terminal side, and the apparatus includes:

The measuring module 72 is configured to: measure a link quality between the terminal and the base station;

The first sending module 74 is configured to: when the link quality meets the first threshold, the terminal acts as a relay terminal to send a corresponding relay discovery signal.

FIG. 8 is a structural block diagram 2 of an apparatus for relay selection and discovery according to an embodiment of the present invention. As shown in FIG. 8, the terminal is located on the terminal side, and the device includes:

The monitoring module 82 is configured to: monitor the relay discovery signal sent by the terminal;

The first selection module 84 is configured to: select a relay terminal according to the relay discovery signal, and send a corresponding request message to the relay terminal, wherein the request information is used by the relay terminal to request a relay transmission from the base station.

FIG. 9 is a structural block diagram 3 of an apparatus for relay selection and discovery according to an embodiment of the present invention. As shown in FIG. 9, the apparatus is located at a base station side, and the apparatus includes:

The second selection module 92 is configured to: select a relay terminal for the remote terminal according to the information of the relay terminal;

The second sending module 94 is configured to: send feedback information carrying the relay terminal information to the remote terminal.

In the embodiment of the present invention, a system for relay selection and discovery is further provided, including: a terminal, a remote terminal, a relay terminal, and a base station;

Example 1:

This embodiment provides a method for selecting and discovering a relay, and the steps include:

Step 11: The intra-coverage D2D UE periodically measures the link quality between the UE and the base station, and the D2D UE that meets the specified threshold range acts as a relay UE, and periodically transmits a relay discovery signal, which is in the foregoing embodiment. The function and function of the first threshold are the same;

Step 12: The remote UE listens to the relay discovery signal sent by the surrounding relay UE, selects a relay UE serving itself, and sends a corresponding request message to the selected relay UE; or the eNB selects a relay UE for the remote UE;

Step 13: If the remote UE selects the relay UE by itself, when the relay UE listens to the request information sent by the remote UE, it uses the PUCCH or the PUSCH to request the relay transmission to the base station. If the relay UE is selected by the eNB, the eNB transmits corresponding feedback information.

In step 11, the quality of the link between the in-coverage D2D UE and the base station includes: RSRP (Reference Signal Receiving Power) and/or RSRQ (Reference Signal Receiving Quality) calculated by the intra-D2D UE according to the pilot transmitted by the base station. Or SINR (Signal to Interference plus Noise Ratio) and/or path loss.

In step 11, the threshold range includes an upper limit and/or a lower limit:

The relay UE that meets the threshold range is a relay UE whose backhaul link quality is greater than a lower limit value and less than an upper limit value;

Or the relay UE that meets the threshold range is a relay UE whose backhaul has a link quality greater than a lower limit.

In step 13, the upper limit and/or the lower limit include:

Pre-agreed in the agreement, or pre-configured, or used in the current system threshold.

In step 11, the relay discovery signal includes ID information of the relay UE, and/or link quality information between the relay UE and the eNB, and the like.

In step 11, the relay discovery signal is sent on a pre-configured relay discovery resource or on a relay discovery resource configured by the eNB.

In step 11, the D2D UE that satisfies the specified threshold range may also first send a request to the eNB that it wishes to act as a relay UE, and then the base station according to the backhaul uplink quality, and/or the mobility of the relay UE, and/or relay The power of the UE or the like determines which D2D UEs act as relay UEs, and the selected relay UE periodically transmits a relay discovery signal.

The D2D UE sends a request to the eNB to play the relay UE on the PUCCH (Physical Uplink Control Channel) or the PUSCH (Physical Uplink Shared Channel).

In step 12, the manner in which the remote UE selects the relay UE includes:

The remote UE measures the link quality between the UE and the one or more relay UEs, and selects one or more relay UEs that meet the specified threshold according to the link quality of the Sidelink, where the remote UE is in the one or more The relay UE randomly selects one or selects the relay UE with the best link quality;

Or the remote UE randomly selects one of the relay UEs that can detect the relay discovery signal or selects the relay UE with the best link quality.

The method for obtaining the link quality of the Sidelink includes: the remote UE calculates the RSRP/RSRQ and/or the SINR and/or the path loss according to the pilot or data symbols sent by the relay UE.

The threshold includes a lower limit, and the relay UE that meets the threshold is a relay UE whose side link has a link quality greater than the threshold;

The lower limit includes:

Pre-agreed in the agreement, or pre-configured by the network, or the threshold in the current system.

In step 12, the manner in which the eNB selects the relay UE includes:

When the remote UE is located outside the coverage, the remote UE reports the link status of the relay UE candidate set and/or the sidelink to the relay UE by using the discovery channel, and the relay UE forwards to the eNB by using the PUSCH, and finally the eNB selects the relay for its service. UE.

When the remote UE is located in the coverage, the remote UE directly reports the link status of the relay UE candidate set and/or the side link to the eNB by using the PUSCH, and the eNB selects the relay UE served by the eNB.

In step 12, the request information sent by the remote UE to the relay UE is carried by the discovery channel, and includes information such as a ProSe Relay UE ID, a PLMN ID, and an ID type.

In step 13, the feedback information carries the UE ID information of the relay service selected by the base station, and the ProSe Relay UE ID of the selected relay UE.

FIG. 10 is a first schematic diagram of a relay selection and discovery process according to an embodiment of the present invention. As shown in FIG. 10, the method includes the steps of: the remote UE is located outside the coverage or within the coverage, and the relay UE that sends the relay discovery signal is determined by the UE itself. And the relay UE selects a relay selection and discovery process determined by the remote UE;

FIG. 11 is a second schematic diagram of a relay selection and discovery process according to an embodiment of the present invention. As shown in FIG. 11, a remote UE is located in an overlay, and a relay UE that transmits a relay discovery signal is determined by the UE itself, and the relay UE is selected by The relay selection and discovery process determined by the eNB;

FIG. 12 is a schematic diagram 3 of a relay selection and discovery process according to an embodiment of the present invention. As shown in FIG. 12, the remote UE is located outside the coverage, and the relay UE that sends the relay discovery signal is determined by the UE itself, and the selection of the Relay UE is determined by The relay selection and discovery process determined by the eNB;

13 is a schematic diagram 4 of a relay selection and discovery process according to an embodiment of the present invention. As shown in FIG. 13, a remote UE is located in or out of coverage, and a relay UE that transmits a relay discovery signal is determined by an eNB, and a Relay UE Select the trunk selection and discovery process determined by the remote UE.

14 is a schematic diagram 5 of a relay selection and discovery process according to an embodiment of the present invention. As shown in FIG. 14, a remote UE is located in an overlay, a relay UE that transmits a relay discovery signal is determined by an eNB, and a selection of a Relay UE is performed by an eNB. The relay selection and discovery process to determine;

15 is a schematic diagram 6 of a relay selection and discovery process according to an embodiment of the present invention. As shown in FIG. 15, the remote UE is located outside the coverage, and the relay UE that transmits the relay discovery signal is determined by the eNB, and the selection of the Relay UE is performed by the eNB. To determine the relay selection and discovery process.

Example 2:

The remote UE is located outside the coverage or within the coverage, and the relay UE selects the relay selection and discovery process determined by the remote UE:

The intra-coverage D2D UE periodically measures the pilot transmitted by the base station to obtain a corresponding RSRP/RSRQ or SINR or path loss. The system defines two thresholds of RSRP/RSRQ or SINR or path loss for the backhaul link, such as N1 and N2. When the measured RSRP/RSRQ or SINR or path loss value of the D2D UE is greater than N1 and less than N2 (ie, The D2D UE at the cell edge acts as a relay UE) or when the measured RSRP/RSRQ or SINR or path loss value of the D2D UE is greater than N1 (ie, the D2D UE located at the cell center acts as a relay UE), the D2D UE acts as a relay UE and The relay discovery signal is periodically transmitted, as shown in FIG.

Or the measured RSRP/RSRQ or SINR or the path loss value is greater than N1 or less than N2 or RSRP/RSRQ or SINR or the path loss value is greater than N1. The D2D UE first sends a request to the eNB to play the relay UE by using the PUCCH or the PUSCH, and then the base station Determining which D2D UEs act as relay UEs according to the backhaul uplink quality, and/or the mobility of the relay UE, and/or the power of the relay UE, etc., and the selected relay UE periodically sends a relay discovery signal, such as Figure 13 shows.

The relay discovery signal is sent on the pre-configured relay discovery resource or the eNB configures the relay discovery resource, including the ID information of the relay UE and/or the link quality information between the relay UE and the eNB.

The remote UE having the communication requirement with the base station listens to the relay discovery signal sent by the surrounding relay UE, selects a relay UE serving itself, and sends a corresponding request message to the selected relay UE. There are two ways for the relay UE to be selected. One is that the remote UE measures the pilot or data symbol sent by the relay UE, and obtains the corresponding RSRP/RSRQ or SINR or path loss. The system defines a threshold R of RSRP/RSRQ or SINR or path loss for the sidelink. When the RSRP/RSRQ or SINR or path loss value measured by the remote UE is greater than M, it is a candidate relay UE, and then the remote UE is Select one relay UE among the candidate relay UEs or select the relay UE with the best sidelink link quality. The other is that if the remote UE can detect the discovery signal sent by the relay UE, it is included in the candidate relay UE, and the remote UE selects one relay UE among the candidate relay UEs or selects the relay UE with the best sidelink link quality.

The remote UE sends a corresponding request message to the selected relay UE through the discovery channel, including information such as a ProSe Relay UE ID, a PLMN ID, and an ID type.

After the relay UE listens to the request information sent by the remote UE, it uses the PUCCH or the PUSCH to request the relay transmission to the base station.

The base station authorizes the relay UE and the remote UE to establish a connection, thereby starting control and data transmission.

Example 3:

The remote UE is located in the coverage, and the relay UE selects the relay selection and discovery process determined by the eNB:

The intra-coverage D2D UE periodically measures the pilot transmitted by the base station to obtain a corresponding RSRP/RSRQ or SINR or path loss. The system defines two thresholds of RSRP/RSRQ or SINR or path loss for the backhaul link, such as N1 and N2. When the measured RSRP/RSRQ or SINR or path loss value of the D2D UE is greater than N1 and less than N2 (ie, The D2D UE at the cell edge acts as a relay UE) or when the measured RSRP/RSRQ or SINR or path loss value of the D2D UE is greater than N1 (ie, the D2D UE located at the cell center acts as a relay UE), the D2D UE acts as a relay UE and Cycle The transmission of the relay discovery signal is shown in Figure 11.

Or the measured RSRP/RSRQ or SINR or the path loss value is greater than N1 or less than N2 or RSRP/RSRQ or SINR or the path loss value is greater than N1. The D2D UE first sends a request to the eNB to play the relay UE by using the PUCCH or the PUSCH, and then the base station Determining which D2D UEs act as relay UEs according to the backhaul uplink quality, and/or the mobility of the relay UE, and/or the power of the relay UE, etc., and the selected relay UE periodically sends a relay discovery signal, such as Figure 14 shows.

The remote UE having the communication requirement with the base station listens to the relay discovery signal sent by the surrounding relay UE, and determines the candidate relay UE. There are two methods for determining the candidate relay UE. One is that the remote UE measures the pilot or data symbols sent by the relay UE, and obtains the corresponding RSRP/RSRQ or SINR or path loss. The system pre-configures a threshold R of RSRP/RSRQ or SINR or path loss for the sidelink. When the RSRP/RSRQ or SINR or path loss value measured by the remote UE is greater than M, the relay UE is included in the candidate relay UE. . The other is that as long as the remote UE can detect the discovery signal sent by the relay UE, it is included in the candidate relay UE.

The remote UE directly reports the link status of the candidate relay UE and/or the side link to the eNB by using the PUSCH.

The eNB selects the relay UE that is served by the eNB according to the reporting situation, and sends the corresponding feedback information to the remote UE by using the downlink traffic channel or the downlink control channel, where the feedback information carries the relay service UE information selected by the base station.

The eNB authorizes the relay UE and the remote UE to establish a connection, thereby starting control and data transmission.

Example 4:

The remote UE is located outside the coverage, and the relay UE selects the relay selection and discovery process determined by the eNB:

The intra-coverage D2D UE periodically measures the pilot transmitted by the base station to obtain the corresponding RSRP/RSRQ. Or SINR or road loss. The system defines two thresholds of RSRP/RSRQ or SINR or path loss for the backhaul link, such as N1 and N2. When the measured RSRP/RSRQ or SINR or path loss value of the D2D UE is greater than N1 and less than N2 (ie, The D2D UE at the cell edge acts as a relay UE) or when the measured RSRP/RSRQ or SINR or path loss value of the D2D UE is greater than N1 (ie, the D2D UE located at the cell center acts as a relay UE), the D2D UE acts as a relay UE and The relay discovery signal is periodically transmitted, as shown in FIG.

Or the measured RSRP/RSRQ or SINR or the path loss value is greater than N1 or less than N2 or RSRP/RSRQ or SINR or the path loss value is greater than N1. The D2D UE first sends a request to the eNB to play the relay UE by using the PUCCH or the PUSCH, and then the base station Determining which D2D UEs act as relay UEs according to the backhaul uplink quality, and/or the mobility of the relay UE, and/or the power of the relay UE, etc., and the selected relay UE periodically sends a relay discovery signal, such as Figure 15 shows.

The remote UE forwards the link status of the candidate relay UE and/or the sidelink to the relay UE in the candidate relay UE by using the PUSCH, and the relay UE forwards the information reported by the remote UE to the eNB by using the PUSCH.

The eNB selects a relay UE for which the relay UE serves according to the information that is forwarded by the relay UE, and sends a corresponding feedback information to the selected relay UE by using the downlink traffic channel, where the feedback information carries the UE with the relay service selected by the base station. information.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention in essence or the contribution to the related art can be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, CD-ROM). The method includes a plurality of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method of the embodiment of the present invention.

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps of the implementation method:

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A plurality of media such as a disc or an optical disc that can store the program code of the method of the above embodiment.

Optionally, in the embodiment, the processor executes the foregoing embodiment method according to the stored program code in the storage medium.

Obviously, those skilled in the art should understand that the above-described modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network of multiple computing devices. Alternatively, they may be implemented by program code executable by a computing device such that they may be stored in a storage device by a computing device and, in some cases, may be executed in a different order than herein. The steps shown or described are either made separately into a plurality of integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above is only an embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

The embodiment of the invention solves the problem of control transmission and data transmission between the base station and the remote terminal in the semi-coverage scenario, and realizes the connection communication between the network side and the coverage terminal.

Claims

A method of relay selection and discovery, including:

The terminal measures the link quality between the terminal and the base station;

When the link quality meets the first threshold, the terminal acts as a relay terminal to send a corresponding relay discovery signal.
The method of claim 1 wherein said link quality comprises at least one of:

The terminal receives the power RSRP according to the reference signal calculated by the pilot transmitted by the base station;

The terminal receives a quality RSRQ according to a reference signal calculated by the pilot transmitted by the base station;

The signal calculated by the terminal according to the pilot transmitted by the base station and the interference plus noise ratio SINR;

The path loss calculated by the terminal according to the pilot transmitted by the base station.
The method according to claim 1, wherein, in the case where the first threshold includes a first upper limit value and/or a first lower limit value, the link quality satisfies the first threshold value Includes at least one of the following:

a terminal whose link quality between the terminal and the base station is greater than the first lower limit value and smaller than the first upper limit value;

The link quality of the backhaul link between the terminal and the base station is greater than the terminal of the first lower limit.
The method of claim 3, wherein the first upper limit value and/or the first lower limit value comprises at least one of the following:

The first upper limit value and/or the first lower limit value predefined in the protocol;

The first upper limit value and/or the first lower limit value preconfigured on the network side;

Threshold in the current system.
The method of claim 1 wherein said relay discovery signal comprises at least one of:

Identification information of the terminal;

Link information between the terminal and the base station.
The method of claim 1 further comprising:

The relay discovery signal is sent on a pre-configured relay discovery resource or on a relay discovery resource configured by the base station.
The method of claim 1 further comprising:

a terminal that satisfies the first threshold corresponding to the link quality, and sends a request for the terminal to act as a relay base station to the base station;

The terminal receives a relay terminal selection decision of the base station, and selects the terminal to serve as a relay terminal according to the relay terminal selection decision, where the information for determining the relay terminal selection decision includes at least one of the following: Uplink quality information of a backhaul link between the terminal and the base station, mobility information of the terminal, power information of the terminal.
The method of claim 7 wherein

The request that the terminal acts as a relay terminal is carried on a physical uplink control channel PUCCH or a physical uplink traffic channel PUSCH.
A method of relay selection and discovery, including:

The remote terminal monitors the relay discovery signal sent by the terminal, selects the relay terminal according to the relay discovery signal, and sends a corresponding request message to the relay terminal; wherein the request information is used for the relay terminal Request a relay transmission to the base station.
The method according to claim 9, wherein the remote terminal monitors a relay discovery signal sent by the terminal, and selecting the relay terminal according to the relay discovery signal comprises one of the following:

The remote terminal measures a link quality between the remote terminal and the relay terminal, and selects a relay terminal that meets a second threshold according to the link quality;

The remote terminal randomly selects a relay terminal in the relay terminal;

The remote terminal selects the relay terminal with the best link quality.
The method of claim 10 wherein said link quality comprises at least one of:

a reference signal calculated by the remote terminal according to a pilot or data symbol transmitted by the relay terminal Receive power RSRP;

Receiving quality RSRQ of the reference signal calculated by the remote terminal according to the pilot or data symbol sent by the relay terminal;

The signal and interference plus noise ratio SINR calculated by the remote terminal according to the pilot or data symbol sent by the relay terminal;

The path loss calculated by the remote terminal according to the pilot or data symbol sent by the relay terminal.
The method according to claim 10, wherein, in the case that the second threshold includes a second lower limit, the selecting the relay terminal that satisfies the second threshold comprises:

And selecting a relay terminal whose edge link of the relay terminal is greater than the second lower limit.
The method of claim 12 wherein said second lower limit value comprises at least one of:

The second lower limit value predefined in the protocol;

The second lower limit value preconfigured on the network side;

Threshold in the current system.
The method of claim 9 wherein:

The request information sent by the remote terminal to the relay terminal is carried by the discovery channel;

The request message includes at least one of the following: a proximity service relay terminal identity ID, a public land mobile network identity ID, and an identity ID type.
A method of relay selection and discovery, including:

The base station selects a relay terminal for the remote terminal according to the information of the relay terminal;

The base station sends feedback information carrying the relay terminal information to the remote terminal.
The method according to claim 15, wherein before the base station selects a relay terminal for the remote terminal according to the information of the relay terminal, the method further includes:

When the remote terminal is located outside the network coverage, the base station receives a relay terminal candidate set and/or a link link status of the edge link forwarded by the relay terminal by using a physical uplink control channel (PUSCH), where The link status of the terminal candidate set and/or the edge link is that the remote terminal utilizes the transmission Sending the current channel to the relay terminal;

When the remote terminal is located in the network coverage, the base station receives a link terminal candidate set and/or a link link status of the edge link transmitted by the remote terminal using the physical uplink control channel PUSCH.
The method of claim 15, wherein the feedback information comprises at least one of:

The remote terminal identifies the ID information, and the relay terminal is adjacent to the service identity information.
A device for relay selection and discovery, located on the terminal side, comprising:

a measuring module, configured to: measure a link quality between the terminal and a base station;

The first sending module is configured to: when the link quality meets the first threshold, the terminal acts as a relay terminal to send a corresponding relay discovery signal.
A device for relay selection and discovery, located on the remote terminal side, includes:

The monitoring module is configured to: monitor a relay discovery signal sent by the terminal;

a first selection module, configured to: select a relay terminal according to the relay discovery signal, and send a corresponding request message to the relay terminal, where the request information is used by the relay terminal to request from the base station Following the transmission.
A device for relay selection and discovery, located at the base station side, includes:

a second selection module, configured to: select a relay terminal for the remote terminal according to the information of the relay terminal;

The second sending module is configured to: send feedback information carrying the relay terminal information to the remote terminal.
A system for relay selection and discovery, comprising: a terminal, a remote terminal, a relay terminal, and a base station;

The terminal is configured to: measure a link quality between the terminal and a base station, where the terminal is in a network coverage; if the link quality meets a first threshold, the terminal acts as the middle Following the terminal sending a corresponding relay discovery signal;

The remote terminal is configured to: monitor the relay discovery signal, select a relay terminal according to the relay discovery signal, and send a corresponding request message to the relay terminal, where the request information is used by the The relay terminal requests a relay transmission from the base station.