CN115428527A

CN115428527A - Method and device for data transmission

Info

Publication number: CN115428527A
Application number: CN202080099652.9A
Authority: CN
Inventors: 卢前溪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-06-03
Filing date: 2020-09-21
Publication date: 2022-12-02
Also published as: WO2021243887A1; WO2021243604A1

Abstract

A method and a device for data transmission are provided, the method comprises: the method comprises the steps that a remote terminal selects target connection in first connection and second connection, wherein the first connection is the connection of the remote terminal directly connected with network equipment, the second connection is the connection of the remote terminal connected with the network equipment through a relay terminal, the remote terminal and the relay terminal are connected through third connection, and the third connection comprises sidelink connection.

Description

Method and device for data transmission

This application claims priority from PCT patent application No. PCT/CN2020/094189 entitled "method and apparatus for data transmission" filed by the chinese patent office on 03/06/2020 and incorporated herein by reference in its entirety.

Technical Field

The embodiments of the present application relate to the field of communications, and more particularly, to a method and apparatus for data transmission.

Background

In some scenarios, a remote terminal may be connected to the network device through a relay terminal, or may also be directly connected to the network device. When the relay terminal can be a layer 2 relay, the remote terminal can only be connected to the network device in one way, and when at least one available connection exists between the remote terminal and the network device, how to transmit data between the remote terminal and the network device is a problem which needs to be solved urgently.

Disclosure of Invention

A method and device for data transmission are provided, which can select a connection as a target connection under the condition that at least one connection exists between a remote terminal and a network device, and further perform data transmission with the network device through the target connection.

In a first aspect, a method for data transmission is provided, including: the method comprises the steps that a far-end terminal selects target connection in first connection and second connection, wherein the first connection is the connection of the far-end terminal directly connected with network equipment, and the second connection is the connection of the far-end terminal connected with the network equipment through a relay terminal.

In a second aspect, a method for data transmission is provided, including: the method comprises the steps that a far-end terminal selects target connection in fifth connection and sixth connection, wherein the fifth connection is the connection of the far-end terminal with network equipment through a relay terminal, the sixth connection is the connection of the far-end terminal with the network equipment through the relay terminal, the far-end terminal is connected with the relay terminal through seventh connection, the far-end terminal is further connected with the relay terminal through eighth connection, and the seventh connection and the eighth connection comprise sidelink connection.

In a third aspect, a data transmission device is provided, which is configured to perform the methods in the first aspect to the second aspect or their implementation manners. In particular, the apparatus comprises functional modules for performing the methods in the first to second aspects or implementations thereof described above.

In a fourth aspect, an apparatus for data transmission is provided that includes a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and execute the computer program stored in the memory to perform the method in the first aspect to the second aspect or each implementation manner thereof.

In a fifth aspect, a chip is provided for implementing the methods in the first to second aspects or their implementations. Specifically, the chip includes: a processor, configured to call and run a computer program from a memory, so that a device in which the chip is installed performs the method according to the first aspect to the second aspect or the implementation manners thereof.

A sixth aspect provides a computer-readable storage medium for storing a computer program, the computer program causing a computer to perform the methods of the first to second aspects or implementations thereof.

In a seventh aspect, a computer program product is provided, which includes computer program instructions to make a computer execute the method in the first to the second aspects or the implementation manners thereof.

In an eighth aspect, there is provided a computer program which, when run on a computer, causes the computer to perform the method of the first to second aspects or implementations thereof.

Based on the technical scheme, under the condition that at least one connection possibly exists between the remote equipment and the network equipment, one connection is selected as a target connection, and data transmission is further carried out between the target connection and the network equipment, so that the normal data transmission between the network equipment and the remote terminal is favorably ensured. Meanwhile, flexible selection of connection in different scenes can be realized, so that the data transmission can be performed by selecting proper connection under different conditions, and the data transmission performance can be improved by fixedly using one connection instead of performing data transmission.

Drawings

Fig. 1 is a schematic diagram of a communication system architecture provided in an embodiment of the present application.

Fig. 2 is a schematic diagram of relay transmission according to an embodiment of the present application.

Fig. 3 is a schematic flow chart of a method for data transmission according to an embodiment of the present application.

Fig. 4 is a connection diagram of a remote terminal targeting a first connection.

Fig. 5 is a connection diagram of a remote terminal targeting a second connection.

Fig. 6 is a schematic flow chart of a method for data transmission according to an embodiment of the present application.

Fig. 7 is a schematic block diagram of a device for data transmission according to an embodiment of the present application.

Fig. 8 is a schematic block diagram of a device for data transmission according to an embodiment of the present application.

Fig. 9 is a schematic block diagram of a communication device provided according to an embodiment of the present application.

FIG. 10 is a schematic block diagram of a circuit provided according to an embodiment of the application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without making any creative effort with respect to the embodiments in the present application belong to the protection scope of the present application.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: global System for Mobile communications (GSM) System, code Division Multiple Access (CDMA) System, wideband Code Division Multiple Access (WCDMA) System, general Packet Radio Service (GPRS), long Term Evolution (Long Term Evolution, LTE) System, LTE-a System, new Radio (NR) System, evolution System of NR System, LTE-based Access to unlicensed spectrum, LTE-U) System, NR-based to unlicensed spectrum (NR-U) System, non-Terrestrial communication network (NTN) System, universal Mobile Telecommunications System (UMTS), wireless Local Area Network (WLAN), wireless Fidelity (WiFi), 5th-Generation (5G) System, or other communication systems.

Generally, the conventional Communication system supports a limited number of connections and is easy to implement, however, with the development of Communication technology, the mobile Communication system will support not only conventional Communication but also, for example, device to Device (D2D) Communication, machine to Machine (M2M) Communication, machine Type Communication (MTC), vehicle to Vehicle (V2V) Communication, or Vehicle to internet (V2X) Communication, and the embodiments of the present application can also be applied to these Communication systems.

Optionally, the communication system in the embodiment of the present application may be applied to a Carrier Aggregation (CA) scenario, may also be applied to a Dual Connectivity (DC) scenario, and may also be applied to an independent (SA) networking scenario.

Optionally, the communication system in the embodiment of the present application may be applied to an unlicensed spectrum, where the unlicensed spectrum may also be considered as a shared spectrum; alternatively, the communication system in the embodiment of the present application may also be applied to a licensed spectrum, where the licensed spectrum may also be regarded as an unshared spectrum.

Various embodiments are described in connection with a network device and a terminal device, where the terminal device may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, or a User Equipment.

The terminal device may be a STATION (ST) in a WLAN, and may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) STATION, a Personal Digital Assistant (PDA) device, a handheld device with Wireless communication capability, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next generation communication system such as an NR Network, or a terminal device in a future evolved Public Land Mobile Network (PLMN) Network, and the like.

In the embodiment of the application, the terminal equipment can be deployed on the land, including indoor or outdoor, handheld, wearable or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.).

In this embodiment, the terminal device may be a Mobile Phone (Mobile Phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in self driving (self driving), a wireless terminal device in remote medical (remote medical), a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation safety (transportation safety), a wireless terminal device in city (smart city), a wireless terminal device in smart home (smart home), or the like.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable intelligent equipment, is the general term of applying wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart jewelry and the like.

In this embodiment, the network device may be a device for communicating with a mobile device, and the network device may be an Access Point (AP) in a WLAN, a Base Station (BTS) in GSM or CDMA, a Base Station (NodeB, NB) in WCDMA, an evolved Node B (eNB, eNodeB) in LTE, a relay Station or an Access Point, or a vehicle-mounted device, a wearable device, a network device (gNB) in an NR network, a network device in a future evolved PLMN network, or a network device in an NTN network.

By way of example and not limitation, in embodiments of the present application, a network device may have a mobile nature, e.g., the network device may be a mobile device. Alternatively, the network device may be a satellite, balloon station. For example, the satellite may be a Low Earth Orbit (LEO) satellite, a Medium Earth Orbit (MEO) satellite, a geosynchronous Orbit (GEO) satellite, a High Elliptic Orbit (HEO) satellite, and the like. Alternatively, the network device may be a base station installed on land, water, or the like.

In this embodiment of the present application, a network device may provide a service for a cell, and a terminal device communicates with the network device through a transmission resource (e.g., a frequency domain resource or a spectrum resource) used by the cell, where the cell may be a cell corresponding to the network device (e.g., a base station), and the cell may belong to a macro base station or a base station corresponding to a Small cell (Small cell), where the Small cell may include: urban cells (Metro cells), micro cells (Micro cells), pico cells (Pico cells), femto cells (Femto cells), and the like, and the small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-rate data transmission services.

Illustratively, a communication system 100 applied in the embodiment of the present application is shown in fig. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or referred to as a communication terminal, a terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area.

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that, in the embodiments of the present application, a device having a communication function in a network/system may be referred to as a communication device. Taking the communication system 100 shown in fig. 1 as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function, and the network device 110 and the terminal device 120 may be the specific devices described above and are not described herein again; the communication device may also include other devices in the communication system 100, such as other network entities, for example, a network controller, a mobility management entity, and the like, which are not limited in this embodiment.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

It should be understood that "indication" mentioned in the embodiments of the present application may be a direct indication, an indirect indication, or an indication of an association relationship. For example, a indicates B, which may mean that a directly indicates B, e.g., B may be obtained by a; it may also mean that a indicates B indirectly, for example, a indicates C, and B may be obtained by C; it can also mean that there is an association between a and B.

In the description of the embodiments of the present application, the term "correspond" may indicate that there is a direct correspondence or an indirect correspondence between the two, may also indicate that there is an association between the two, and may also indicate and is indicated, configure and is configured, and the like.

In some scenarios, remote (remote) UE communication may be implemented with a terminal device-to-relay network (UE-to-network relay). The remote UE may have multiple connection modes to connect to the network device:

mode A: communication with a network device is achieved using a relay network (UE-to-network relay).

As shown in fig. 2, the remote UE may connect to the network device through one-hop or multi-hop relay UEs.

Specifically, the remote UE and the relay UE are connected and communicate through a PC5 interface, and the last hop relay UE (i.e., the relay UE directly connected to the network device) and the network device are connected and communicate through a Uu interface, so as to connect the remote UE to a network, for example, an Evolved Core (EPC) or a 5G Core network (5G Core network, 5gc).

If the multi-hop relay UE exists, the relay UE is connected and communicated through a PC5 interface.

Mode B: the remote UE is directly connected to the network device.

For example, the remote UE may connect to and communicate with a network device via a Uu interface.

The relay terminal may be, for example, a layer 2 relay or a layer 3 relay.

For layer 2 relay, it supports functions of part or all layers between an Internet Protocol (IP) layer and a physical layer, and may support one or more functions of a Media Access Control (MAC) layer, a Radio Link Control (RLC) layer, and a Packet Data Convergence Protocol (PDCP) layer, for example.

The layer 3 relay supports a function of an IP layer, and optionally, may also support a function of an upper layer of the IP layer. When the remote terminal accesses the network through the layer 3 relay, the layer 3 relay can take the function of IP layer relay, data is transmitted between the remote terminal and the network, and the remote terminal and the relay terminal are connected through a sidelink.

For layer 3 relay, the remote UE may be connected to the network device in the two manners, and for the network device, it is visible as a terminal device directly connected to the network device, that is, if the remote UE is connected to the network device in the manner a, the network device may only see the relay UE, and it is not clear which UEs the relay UE is connected to, so that data transmission is performed between the network device and the remote UE through any connection.

For layer 2 relay, the remote UE can only connect to the network device via one connection at a time. When at least one available connection exists between the remote UE and the network device, which connection is used for data transmission with the network device is an urgent problem to be solved.

In view of this, the present application provides a data transmission method, which can solve the connection selection problem when at least one connection exists between a remote UE and a network device.

Fig. 3 is a schematic flow chart of a method 300 of data transmission according to an embodiment of the present application, and as shown in fig. 3, the method 300 may include at least some of the following:

s310, a far-end terminal selects a target connection from a first connection and a second connection, wherein the first connection is a connection of the far-end terminal directly connecting with a network device, the second connection is a connection of the far-end terminal connecting with the network device through a relay terminal, and the far-end terminal and the relay terminal are connected through a sidelink.

The embodiment of the present application may be applied to a scenario in which relay transmission is performed through layer 2 relay, or may also be applied to other scenarios in which connection selection needs to be performed, and the present application is not limited thereto.

According to the embodiment of the application, under the condition that at least one connection possibly exists between the remote terminal equipment and the network equipment, one connection is determined as the target connection, and further data transmission is carried out between the remote terminal equipment and the network equipment through the target connection, so that normal data transmission between the remote terminal equipment and the network equipment is guaranteed. In addition, flexible selection of connection in different scenes can be realized, and the method is favorable for ensuring that proper connection is selected for data transmission under different conditions instead of fixedly using one connection for data transmission, and can improve the data transmission performance. For example, when the link condition corresponding to the first connection is degraded, the second connection is selected, or when the remote terminal moves out of the coverage area of the network device corresponding to the first connection, the second connection is selected, and so on.

The first connection is that the remote terminal is directly connected with the network device, that is, no other terminal exists between the remote terminal and the network device, and the remote terminal can directly communicate with the network device.

The second connection is a connection in which the remote terminal is connected to the network device through the relay terminal. It should be understood that the number of relay terminals between the remote terminal and the network device is not limited herein, for example, the remote terminal and the network device may be connected through one or more relay terminals. In other words, the remote terminal may communicate with the network device through the one or more relay terminals.

Optionally, in this embodiment of the present application, the network device directly connected to the terminal device is an access network device in a communication system, for example, an e-NB or a g-NB.

For convenience of distinction and description, a network device directly connected to the remote terminal is referred to as a first network device, and a network device connected to the remote terminal through a relay terminal is referred to as a second network device.

Optionally, the first network device and the second network device may be the same network device, or may also be different network devices, which is not limited in this application.

Optionally, in some embodiments, the remote terminal and the first network device may be connected through a first interface, and the first interface may be, for example, a Uu interface, in which case, the first connection may be referred to as a Uu connection. In other alternative embodiments, the first interface may also be another interface for communication between a terminal and a network device, and the embodiments of the present application are not limited thereto.

Optionally, in some embodiments, the remote terminal and the relay terminal may be connected through a second interface, the second interface may be, for example, a PC5 interface, and the relay terminal directly connected to the second network device and the second network device may be connected through a third interface, which may be, for example, a Uu interface. In this case, the second connection may include at least one PC5 connection and a Uu connection. In other optional embodiments, the second interface may also be another interface used for communication between the terminal and the terminal, and the third interface may also be another interface used for communication between the terminal and the network device, which is not limited in this embodiment of the present application.

It should be noted that "the remote terminal selects the target connection in the first connection and the second connection" may also be expressed as "the remote terminal selects the target interface in the first type of interface and the second type of interface", where the first type of interface is an interface through which the remote terminal and the network device directly communicate, for example, a Uu interface, the second type of interface includes a third interface and a fourth interface, the third interface is an interface through which the remote terminal and the relay terminal communicate, for example, a PC5 interface, and the fourth interface is an interface through which the relay terminal and the network device communicate, for example, a Uu interface. The technical problem can also be solved by selecting a target interface from the first type interface and the second type interface and further carrying out communication through the target interface. Or, "the remote terminal selects a target connection from the first connection and the second connection" may also be expressed as "the remote terminal selects a target link from a first link and a second link," where the first link is a link (or called Direct link) through which the remote terminal and the network device directly communicate, the second link includes a third link and a fourth link, the third link is a link (or called access link) through which the remote terminal and the relay terminal communicate, the fourth link is a link (or called relay link) through which the relay terminal and the network device communicate, the target link is selected from the first link and the second link, and further the target link is used for communication.

It should be understood that other similar expressions may also be adopted in the technical solution of the embodiment of the present application, and the present application is not limited thereto, and for specific implementation, reference may be made to a related implementation of selecting a target connection in the first connection and the second connection, and details are not described here for brevity.

Optionally, in some embodiments of the present application, the remote terminal may select the target connection according to a channel quality of the first connection and a channel quality of the second connection.

Of course, in other embodiments, the remote terminal may also determine the target connection according to other information, for example, data transmission conditions in the first connection and the second connection, parameters such as packet loss rate, reliability, transmission delay, and the like, a movement condition of the remote terminal, location information, and the like, which is not limited in this application. For a specific implementation, reference may be made to a related implementation of connection selection according to channel quality, and for brevity, details are not described here again.

It should be understood that, in the embodiment of the present application, connection selection according to channel quality may be connection selection according to channel quality at a single time, or connection selection may also be connection selection according to channel quality for a period of time, and the present application is not limited thereto.

In some optional embodiments, the remote terminal may perform connection selection according to a certain period, so that an appropriate connection can be dynamically selected for data transmission according to channel qualities of the first connection and the second connection. Optionally, the period may be configured or preconfigured by the network device, or determined by the terminal device itself, for example, the remote terminal may determine the period for performing connection selection according to its historical connection selection condition.

In other alternative embodiments, the remote terminal may also perform connection selection based on a trigger event, and the application is not limited thereto. For example, the connection selection is performed according to an instruction of the network device or other terminal devices. For example, the network device may send an instruction to the remote terminal when the load is large, and instruct the remote terminal to perform connection selection, so that the remote terminal is switched to another connection. Or when the moving range of the far-end terminal exceeds a certain range, connection selection is carried out, and the like.

In some embodiments, the channel quality of the first connection may be determined from the channel quality of a direct connection (or direct link) of the remote terminal and the first network device. For example, the channel quality of the first connection may be the channel quality of the direct connection (or, alternatively, the direct link).

In some implementations, the channel quality of the first connection may be determined according to a measurement result of a downlink reference signal sent by the first network device.

Optionally, the downlink reference signal includes, for example and without limitation, at least one of the following: a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a Demodulation Reference Signal (DMRS), a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and the like; the synchronization signals comprise PSS and SSS; the demodulation reference signal includes DMRSs for demodulation of a Physical Downlink Shared Channel (PDSCH), a Physical Downlink Control Channel (PDCCH), and a Physical Broadcast Channel (PBCH).

Optionally, the measurement result may be, for example, but not limited to, at least one of: channel Quality Indicator (CQI), reference Signal Received Power (RSRP), reference Signal Received Quality (RSRQ), signal to Interference plus Noise Ratio (SINR).

Optionally, in some embodiments of the present application, the second connection may include a third connection between the remote terminal and the relay terminal and a fourth connection between the relay terminal and the second network device.

Optionally, in some embodiments, the remote terminal and the relay terminal are connected by a sidelink, in which case the third connection may include a sidelink connection between the terminal device and the relay terminal.

It should be understood that there may be one relay terminal between the remote terminal and the second network device, or there may also be multiple relay terminals, where the relay terminal may be any relay terminal between the remote terminal and the second network device. For example, if there are multiple relay terminals between the remote terminal and the second network device, the relay terminal may be a first-hop relay terminal, or a last-hop relay terminal.

In some embodiments, the relay terminal is a relay terminal directly connected to the second network device. I.e. the last hop relay terminal.

For example, the remote terminal is connected to the second network device through a relay terminal 1 and a relay terminal 2.

As an example, the second connection may include: a connection 1 between the remote terminal and the relay terminal 1, and a connection 2 between the relay terminal 1 and the second network device, where the connection 2 includes two connections, that is, a connection between the relay terminal 1 and the relay terminal 2, and a connection between the relay terminal 2 and the second network device.

As yet another example, the second connection may include: a connection 3 of the remote terminal to the relay terminal 2 and a connection 4 of the relay terminal 2 to said second network device, wherein the connection 3 comprises two connections, i.e. a connection of the remote terminal to the relay terminal 1 and a connection of the relay terminal 1 to the relay terminal 2.

In other embodiments of the present application, if there are multiple relay terminals between the remote terminal and the second network device, the second connection may be further subdivided to include multiple direct connections, where a direct connection is a connection between two devices in direct communication on a link between the remote terminal and the second network device.

Following the previous example, the second connection may include: the direct connection of the remote terminal to the relay terminal 1, the direct connection of the relay terminal 1 to the relay terminal 2, and the direct connection of the relay terminal 2 to the network device.

Optionally, in this embodiment of the present application, the channel quality of the second connection may be determined according to the channel quality of part or all of the connections between the remote terminal and the second network device.

As example 1: the second connection comprises the third connection and the fourth connection, and the channel quality of the second connection may be determined according to the channel quality of the third connection and/or the channel quality of the fourth connection.

As example 2: the second connection comprises a plurality of direct connections, and the channel quality of the second connection may be determined based on some or all of the plurality of direct connections.

It is to be understood that example 1 is substantially the same as example 2 when there is only one relay terminal between the remote terminal and the network device.

Hereinafter, a determination method of the channel quality of the second connection is described by taking example 1 as an example, and an implementation method of determining the channel quality of the second connection according to example 2 is similar and is not described again here. Optionally, as an example, the channel quality of the second connection is the channel quality of the third connection.

Optionally, as another example, the channel quality of the second connection is the channel quality of the fourth connection.

Optionally, as yet another example, the channel quality of the second connection is a maximum or minimum of the channel quality of the third connection and the channel quality of the fourth connection.

Optionally, as yet another example, the channel quality of the second connection is a product of the channel quality of the third connection and the channel quality of the fourth connection.

Optionally, in other embodiments, the channel quality of the first connection may also be determined according to the stability of the channel quality of the third connection and the fourth connection, which is beneficial to ensure that a connection with high and stable channel quality is selected as a target connection, and data transmission performance is improved.

It will be appreciated that the channel quality of a connection is limited to the channel quality of the connection in the segment of the connection where the channel quality is lowest. Based on this, as an example, a difference between the channel quality of the third connection and the channel quality of the fourth connection over a period of time may be first determined. When the difference satisfies a first condition, for example, the difference between the channel quality of the third connection and the channel quality of the fourth connection is smaller than a first threshold, or the number of the differences smaller than the first threshold is greater than a second threshold, in this case, the channel quality of the third connection and the channel quality of the fourth connection may be considered to be equivalent, and therefore, the channel quality of the second connection may be determined by referring to the channel quality of the third connection and the channel quality of the fourth connection, for example, the channel quality of the third connection and the channel quality of the fourth connection are weighted, averaged, or multiplied to obtain the channel quality of the second connection. When the difference does not satisfy the first condition, for example, the difference between the channel quality of the third connection and the channel quality of the fourth connection is greater than a third threshold for a period of time, or the number of the differences greater than the third threshold is greater than a fourth threshold, in this case, the channel quality of the third connection may be considered to be entirely higher than the channel quality of the second connection, and therefore, the channel quality of the second connection may be determined according to the channel quality of the fourth connection.

In the above, the determination method of the channel quality of the second connection is only an example, and should not be limited to this application, and the channel quality of the second connection may also be calculated in other manners, and when performing the target connection selection in the following, only a channel quality threshold applicable to this manner needs to be configured, and this application is not limited to this.

In this embodiment, the channel quality of the third connection between the remote terminal and the relay terminal may be determined according to a measurement result of a sidelink reference signal sent by the relay terminal.

Optionally, the side row reference signal includes, for example and without limitation, at least one of: a lateral Synchronization Signal Block (S-SSB), a lateral Channel State Information Reference Signal (SL CSI-RS), a Demodulation Reference Signal (DMRS), and the like; the S-SSB comprises a lateral row Primary Synchronization Signal (S-PSS) and a lateral row Secondary Synchronization Signal (S-SSS); DMRSs include DMRSs for Physical Sidelink Shared Channel (psch), and Physical Sidelink Broadcast Channel (PSBCH) demodulation.

Optionally, the measurement result may be, for example, but not limited to, at least one of: CQI of a side row, side-row Reference Signal Receiving Power (SL-RSRP), side-row Reference Signal Receiving Quality (SL-RSRQ), signal to Interference plus Noise Ratio (SINR).

In this embodiment of the present application, the channel quality of the fourth connection between the relay terminal and the second network device may be determined according to a measurement result of a downlink reference signal sent by the second network device.

Optionally, the downlink reference signal includes, for example and without limitation: SSB, CSI-RS, DMRS, etc. Wherein, the SSB includes PSS and SSS, and the DMRS may include DMRS for PDSCH, PDCCH, and PBCH demodulation.

Optionally, the measurement results are for example but not limited to: RSRP, RSRQ, SINR.

Optionally, in some embodiments, after determining the measurement result of the downlink reference signal, the relay terminal may send the measurement result to the remote terminal, so that the remote terminal may select the target connection according to the measurement result of the downlink reference channel.

After determining the channel quality of the first connection and the second connection, the remote terminal may further select the target connection according to the channel quality of the first connection and the second connection. For example, a connection with a better channel quality of the first connection and the second connection may be determined as the target connection. For another example, a connection of the first connection and the second connection having a channel quality above a certain threshold may be determined to be the target connection.

Hereinafter, the selection of the target connection will be specifically described with reference to examples 1 to 3.

It should be noted that, in the embodiment of the present application, when performing comparison according to channel quality, the comparison may be performed according to a measurement result of channel quality at a single time, or may also be performed according to a measurement result of channel quality for a period of time, and the comparison is performed according to a measurement result of channel quality for a period of time, which is beneficial to selecting a connection with stable channel quality as a target connection, and further can ensure reliability of data transmission.

Optionally, the length of the period of time may be preconfigured, or network device configured, etc.

Optionally, in some embodiments of the present application, the comparing according to channel quality over a period of time may include directly or indirectly comparing according to a plurality of channel quality measurement results of the first connection and the second connection over a period of time, respectively, to obtain a plurality of comparison results, and further selecting the target connection according to the plurality of comparison results.

For example, a plurality of first measurement results and a plurality of second measurement results may be respectively compared to obtain a plurality of comparison results, where the plurality of first measurement results are a plurality of measurement results of the channel quality of the first connection in a first time period, and the plurality of second measurement results are a plurality of measurement results of the channel quality of the second connection in a second time period.

Further, a particular connection is selected as the target connection when the plurality of comparison results satisfy a particular condition. The comparison results satisfying the specific condition may mean that the comparison results all satisfy the specific condition, or that the number of the comparison results satisfying the specific condition is greater than a certain threshold.

Optionally, in other embodiments of the present application, comparing according to channel quality in a period of time may also mean that first, the measurement results of the channel quality of the first connection and the second connection in a period of time are processed, for example, averaged, to obtain an integrated result of the channel quality in the period of time, and further compare the integrated result, which is not limited in this application.

Example 1:

the remote terminal firstly determines an available connection of the first connection and the second connection according to the channel quality of the first connection and the channel quality of the second connection, and further selects the target connection according to the available connection.

Optionally, as an embodiment, the remote terminal may determine whether the first connection is available according to the channel quality of the first connection and a first threshold.

For example, the first connection may be determined to be available if the channel quality of the first connection is greater than or equal to the first threshold, or the first connection may be determined to be unavailable if the channel quality of the first connection is less than the first threshold.

For another example, the first connection may be determined to be available if the channel quality of the first connection is above the first threshold, or the first connection may be determined to be unavailable if the channel quality of the first connection is equal to or below the first threshold.

Optionally, the fact that the channel quality of the first connection is higher than the first threshold may mean that the channel quality of the first connection is higher than the first threshold in a period of time, or the number of times that the channel quality of the first connection is higher than the first threshold in a period of time is greater than a first threshold. Alternatively, the first time threshold may be preconfigured, or network device configured, etc. Similarly, the fact that the channel quality of the first connection is lower than the first threshold may mean that the channel quality of the first connection is lower than the first threshold for a period of time, or the number of times the channel quality of the first connection is lower than the first threshold for a period of time is greater than a second threshold, and the like. Optionally, the second time threshold may be preconfigured, or configured by a network device, etc.

Optionally, as an embodiment, the remote terminal may determine whether the second connection is available according to a channel quality of the second connection and a second threshold.

For example, the second connection may be determined to be available if the channel quality of the second connection is greater than or equal to the second threshold, or the second connection may be determined to be unavailable if the channel quality of the second connection is less than the second threshold.

For another example, the second connection may be determined to be available if the channel quality of the second connection is above the second threshold, or the second connection may be determined to be unavailable if the channel quality of the first connection is equal to or below the second threshold.

In some embodiments, the first threshold and the second threshold may be configured by a network device, or preconfigured, or predefined, which is not limited in this application.

Optionally, the first threshold and the second threshold may be equal or may not be equal.

Optionally, the fact that the channel quality of the second connection is higher than the second threshold may mean that the channel quality of the second connection is higher than the second threshold in a period of time, or the number of times that the channel quality of the first connection is higher than the second threshold in a period of time is greater than a third threshold, and the like. Optionally, the third time threshold may be preconfigured, or configured by a network device, etc. Similarly, the channel quality of the second connection being lower than the second threshold may refer to the channel quality of the second connection being lower than the second threshold for a period of time, or the number of times the channel quality of the second connection is lower than the second threshold for a period of time being greater than a fourth time threshold, and so on. Alternatively, the fourth time threshold may be preconfigured, or network device configured, etc.

In some embodiments, the channel quality of the first connection may be determined from measurements of downlink reference signals. As an example, the first threshold may be a threshold value determined according to a measurement result of the downlink reference signal. For example, if the measurement result of the downlink reference signal is RSRP, the first threshold is an RSRP threshold value. For another example, if the measurement result of the downlink reference signal is RSRQ, the first threshold is an RSRQ threshold.

Similarly, the second threshold may also be determined according to a measurement result of the downlink reference signal and/or the sidelink reference signal.

As an example, if the channel quality of the second connection is determined according to the channel quality of the third connection, in this case, the second threshold may be a threshold value determined according to a measurement result of a sidelink reference signal. For example, if the measurement result of the sideline reference signal is SL-RSRP, the second threshold is a SL-RSRP threshold value. For another example, if the measurement result of the sideline reference signal is SL-RSRQ, the second threshold is an SL-RSRQ threshold value.

As another example, if the channel quality of the second connection is determined according to the channel quality of the fourth connection, in this case, the second threshold is a threshold value determined according to a measurement result of a downlink reference signal. For example, if the measurement result of the downlink reference signal is RSRP, the second threshold is an RSRP threshold value. For another example, if the measurement result of the downlink reference signal is RSRQ, the second threshold is an RSRQ threshold.

As another example, if the channel quality of the second connection is determined according to the channel quality of the third connection and the channel quality of the fourth connection, in this case, the second threshold may be determined according to a measurement result of a downlink reference signal and a measurement result of a sidelink reference signal. As an example, if the channel quality of the second connection is a product of the channel quality of the third connection and the channel quality of the fourth connection, in this case, optionally, the second threshold may be an RSRP threshold value SL-RSRP threshold value, or the second threshold may be an RSRQ threshold value SL-RSRQ threshold value, etc.

Further, if there is only one available connection in the first connection and the second connection, that is, only the first connection is available or only the second connection is available, in this case, the remote terminal may select the one available connection as the target connection, and further, the remote terminal may perform data transmission with the network device through the target connection.

Or, if there is no available connection in the first connection and the second connection, the remote terminal may select a connection with a channel quality greater than a minimum threshold of channel quality as a target connection, or select a connection with a better channel quality in the first connection and the second connection as a target connection. Alternatively, the channel quality minimum threshold may be preconfigured or network device configured.

Or, if the first connection and the second connection are both available connections, as an embodiment, since the first connection is a direct connection between the network device and a remote terminal, data transmission is performed through the connection, so that the time delay is small, and the remote terminal may prefer the first connection as the target connection. Alternatively, in other embodiments, the remote terminal may further compare the channel quality of the first connection with the channel quality of the second connection, and select the target connection.

Example 1-1:

the remote terminal may directly compare the channel quality of the first connection with the channel quality of the second connection and select the target connection.

As an embodiment, if the channel quality of the first connection is higher than the channel quality of the second connection, the remote terminal determines that the first connection is the target connection.

In a specific implementation, the measurement results of the channel qualities of the first connection in a period of time and the measurement results of the channel qualities of the second connection in a period of time may be respectively compared to obtain a plurality of comparison results. Further, the target connection is selected based on the plurality of comparison results.

For example, the first connection is selected if the comparison results are all results of a measurement of channel quality for the first connection greater than a measurement of channel quality for the second connection.

In other embodiments, in a case that the channel quality of the first connection is higher than the channel quality of the second connection, the remote terminal may further determine that the channel quality of the first connection is higher than the channel quality of the second connection, for example, if a difference between the channel quality of the first connection and the channel quality of the second connection is greater than a third threshold, that is, the channel quality of the first connection is higher than the channel quality of the second connection by more than the third threshold, the first connection may be selected as the target connection.

In this embodiment, the second connection is often the preferred connection, and the first connection is selected as the target connection only if the channel quality of the first connection is much higher than the channel quality of the second connection.

As another embodiment, if the channel quality of the first connection is lower than the channel quality of the second connection, in this case, the remote terminal selects the second connection as the target connection.

In a specific implementation, the multiple channel quality measurement results of the first connection in a period of time may be compared with the multiple channel quality measurement results of the second connection in a period of time, respectively, to obtain multiple comparison results. Further, the target connection is selected based on the plurality of comparison results.

For example, the second connection is selected if the comparison results are all that the measurement result of the channel quality of the first connection is smaller than the measurement result of the channel quality of the second connection.

In other embodiments, in a case that the channel quality of the first connection is lower than the channel quality of the second connection, the remote terminal may further determine that the channel quality of the first connection is lower than the channel quality of the second connection, for example, if a difference between the channel quality of the first connection and the channel quality of the second connection is smaller than a fourth threshold, that is, the channel quality of the first connection is lower than the channel quality of the second connection by more than the fourth threshold, the second connection may be selected as the target connection.

In this embodiment, the first connection is often the preferred connection, and the second connection is selected as the target connection only if the channel quality of the first connection is much worse than the channel quality of the second connection.

Optionally, in some embodiments of the present application, the third threshold and the fourth threshold may be configured, or preconfigured, or predefined by a network device, which is not limited in this application.

In some embodiments, when comparing the channel quality of the first connection and the channel quality of the second connection, the channel quality of the first connection and the channel quality of the second connection may be unified into the same standard first, for example, both expressed as RSRP or both expressed as RSRQ, and the specific adjustment factor may be determined according to a relationship of different measurement results.

In other embodiments, when comparing the channel quality of the first connection with the channel quality of the second connection, the channel quality of the first connection and the channel quality of the second connection may not be unified into the same standard, in which case, the third threshold and the fourth threshold may be configured appropriately to ensure the accuracy of the comparison result of the channel quality of the first connection and the channel quality of the second connection.

Examples 1 to 2:

the remote terminal may indirectly compare the channel quality of the first connection to the channel quality of the second connection to determine the target connection.

As an embodiment, if the channel quality of the first connection is higher than a fifth threshold and the channel quality of the second connection is lower than a sixth threshold, the first connection is determined to be the target connection.

In this case, in some embodiments, the second connection is a connection currently serving a remote terminal. Alternatively, the first connection has a higher priority than the second connection.

Optionally, the fact that the channel quality of the first connection is higher than a fifth threshold may mean that the channel quality of the first connection is higher than the fifth threshold in a period of time, or the number of times that the channel quality of the first connection is higher than the fifth threshold in a period of time is greater than a seventh threshold, and the like. Optionally, the seventh time threshold may be preconfigured, or network device configured, etc.

Optionally, that the channel quality of the second connection is lower than a sixth threshold may mean that the channel quality of the second connection is lower than the sixth threshold in a period of time, or the number of times that the channel quality of the second connection is lower than the sixth threshold in a period of time is greater than an eighth threshold, and the like. Alternatively, the eighth time threshold may be preconfigured, or network device configured, etc.

As another embodiment, if the channel quality of the first connection is lower than a seventh threshold and the channel quality of the second connection is higher than an eighth threshold, the second connection is determined to be the target connection.

In this case, in some embodiments, the first connection is a connection currently serving a remote terminal. Alternatively, the second connection has a higher priority than the first connection.

As another embodiment, if the channel quality of the first connection is higher than a fifth threshold, the first connection is selected as the target connection. In this case, in some embodiments, the second connection is a connection currently serving a remote terminal. Alternatively, or in addition, the first connection has a higher priority than the second connection.

As another embodiment, if the channel quality of the second connection is higher than an eighth threshold, the second connection is selected as the target connection. In this case, in some embodiments, the first connection is a connection currently serving a remote terminal. Alternatively, the second connection has a higher priority than the first connection.

Optionally, in this embodiment, the priority of the first connection may be a frequency priority to which the first connection belongs. The priority of the second connection may be a frequency priority to which the second connection belongs.

Alternatively, that the channel quality of the first connection is lower than the seventh threshold may mean that the channel quality of the first connection is lower than the seventh threshold in a period of time, or the number of times that the channel quality of the first connection is lower than the seventh threshold in a period of time is greater than a ninth threshold, and the like. Optionally, the ninth time threshold may be preconfigured, or network device configured, etc.

Optionally, the fact that the channel quality of the second connection is higher than the eighth threshold may mean that the channel quality of the second connection is higher than the eighth threshold in a period of time, or the number of times that the channel quality of the second connection is higher than the eighth threshold in a period of time is greater than a tenth threshold, and the like. Optionally, the tenth time threshold may be preconfigured, or network device configured, etc.

In this embodiment, the fifth threshold, the sixth threshold, the seventh threshold, and the eighth threshold may be configured, preconfigured, or predefined by a network device, and this is not limited in this application.

In some embodiments, the fifth threshold is greater than the seventh threshold, and the sixth threshold is less than the eighth threshold.

In this embodiment 1-2, the channel quality of the first connection and the channel quality of the second connection may be characterized by the same parameter, e.g., both RSRP or RSRQ, or may be characterized by different parameters, e.g., one RSRP and the other RSRQ.

The fifth threshold and the seventh threshold are threshold values corresponding to the characterization parameters of the channel quality of the first connection. For example, if the channel quality of the first connection is characterized by RSRP, the fifth threshold and the seventh threshold are both RSRP threshold values.

Similarly, the sixth threshold and the eighth threshold are threshold values corresponding to the characterization parameter of the channel quality of the second connection. For example, if the channel quality of the second connection is characterized by RSRP, the sixth threshold and the eighth threshold are RSRP threshold values.

Optionally, in some embodiments, when the channel quality of the first connection and the channel quality of the second connection are characterized by the same parameter, the fifth threshold may be greater than or equal to the sixth threshold, and the seventh threshold is less than or equal to the eighth threshold.

Optionally, in some embodiments, to ensure that the first connection is preferred as the target connection, in this case, the fifth threshold may be configured to be a lower threshold, and the sixth threshold may be configured to be a higher threshold; or configuring the seventh threshold as a lower threshold, and the eighth threshold as a higher threshold, so that when the channel quality of the first connection is equal to the channel quality of the second connection or the channel quality of the first connection is slightly lower than the channel quality of the second connection, the first connection is preferably used as a target connection to reduce the delay of data transmission.

It should be understood that, in the embodiment of the present application, the channel quality of the first connection is higher than the fifth threshold, and the channel quality of the second connection is lower than the sixth threshold, it may be considered that the channel quality of the first connection is sufficiently high, and the channel quality of the second connection is poor, in this case, selecting the first connection as the target connection is beneficial to ensure reliable transmission of data between the network device and the terminal device.

It should also be understood that, in the embodiment of the present application, the channel quality of the first connection is lower than the seventh threshold, and the channel quality of the second connection is higher than the eighth threshold, it may be considered that the channel quality of the first connection is poor, and the channel quality of the second connection is sufficiently high, in this case, selecting the second connection as the target connection is beneficial to ensure reliable transmission of data between the network device and the terminal device.

Example 2:

the remote terminal may directly compare the channel quality of the first connection with the channel quality of the second connection to select the target connection.

The difference from example 1 is: in this embodiment 2, the target connection may be selected directly according to the channel quality of the first connection and the second connection without making a judgment on the availability of the first connection and the second connection. The specific selection manner can refer to the description of embodiment 1-1, and is not described herein again.

Example 3:

the remote terminal may indirectly compare the channel quality of the first connection with the channel quality of the second connection to select the target connection.

The difference from example 1 is: in this embodiment 3, a target connection may be selected directly according to the channel qualities of the first connection and the second connection without making a judgment on the availability of the first connection and the second connection. The specific selection manner can refer to the description of embodiments 1-2, and is not described herein again.

Further, when it is determined that the first connection is the target connection, the remote terminal may use the first connection to communicate with a network device, for example, as shown in fig. 4.

Alternatively, when it is determined that the second connection is the target connection, the remote terminal may use the second connection to communicate with a network device, as shown in fig. 5.

Therefore, in the embodiment of the present application, when there may be at least one connection between the remote device and the network device, the target connection is selected according to the channel quality of the at least one connection, and further data transmission is performed with the network device through the target connection, which is beneficial to ensuring the reliability of data transmission between the terminal device and the network device. And the flexible selection of connection under different scenes can be realized, which is beneficial to ensuring that the data transmission is carried out by selecting proper connection under different conditions, rather than fixedly using one connection for data transmission, and the data transmission performance can be improved.

Fig. 6 is a schematic flow chart of a method 200 of data transmission according to an embodiment of the present application, and as shown in fig. 6, the method 200 may include at least some of the following:

and S210, the remote terminal selects a target connection from a fifth connection and a sixth connection, wherein the fifth connection is the connection of the remote terminal with the network equipment through the relay terminal, the sixth connection is the connection of the remote terminal with the network equipment through the relay terminal, the remote terminal and the relay terminal are connected through a seventh connection, the remote terminal and the relay terminal are further connected through an eighth connection, and the seventh connection and the eighth connection comprise a sidelink connection.

In this embodiment, at least two relay connections exist between the remote terminal and the network device, and optionally, a direct connection may also exist between the remote terminal and the network device, for example, the first connection in the foregoing embodiment, which is not limited in this application.

It should be understood that, in the embodiment of the present application, the relay connection may refer to a connection established by the remote terminal with the network device through the interrupt terminal, which may include a connection between the remote terminal and the relay terminal and a connection between the relay terminal and the network device.

It should be understood that in the method 200, the specific connection manner of the fifth connection and the sixth connection is similar to the connection manner of the second connection in the method 300, and therefore, for brevity, the detailed description is omitted here.

It should be understood that in the embodiment of the present application, there may be more than two relay connections between the remote terminal and the network device, and when there are more relay connections, the manner of performing target connection selection is similar, and details are not described here.

It should be further understood that at least two relay connections between the remote terminal and the network device may be implemented by one relay terminal, or may also be implemented by at least two relay terminals, which is not limited in this application.

It should be noted that, in the embodiment of the present application, the present application may be applied to select one relay connection from at least two relay connections as a target connection, or may be applied to select one connection from at least one relay connection and at least one direct connection as a target connection, or select one connection from at least two direct connections as a target connection, and the like, which is not limited in this application.

According to the embodiment of the application, under the condition that at least two connections possibly exist between the remote terminal and the network equipment, one connection is determined as the target connection, and further data transmission is carried out between the remote terminal and the network equipment through the target connection, so that normal data transmission between the remote terminal and the network equipment is guaranteed. In addition, flexible selection of connection in different scenes can be realized, and the method is favorable for ensuring that proper connection is selected for data transmission under different conditions instead of fixedly using one connection for data transmission, and can improve the data transmission performance.

Optionally, in some embodiments of the present application, the remote terminal may select the target connection according to a channel quality of the fifth connection and a channel quality of the sixth connection.

Specifically, for a determination manner of the channel quality of the fifth connection and the channel quality of the sixth connection, reference may be made to the determination manner of the channel quality of the second connection in method 300, and details are not repeated here for simplicity.

In some embodiments, the fifth connection comprises a seventh connection between the remote terminal and a relay terminal and a ninth connection between the relay terminal and a network device.

The channel quality of the fifth connection may be determined on the basis of the channel quality of the seventh connection and/or the channel quality of the ninth connection.

For example, the channel quality of the fifth connection is the channel quality of the seventh connection.

For another example, the channel quality of the fifth connection is the channel quality of the ninth connection.

For another example, the channel quality of the fifth connection is a maximum or minimum of the channel quality of the seventh connection and the channel quality of the ninth connection.

As another example, the channel quality of the fifth connection is the product of the channel quality of the seventh connection and the channel quality of the ninth connection.

In some embodiments, the sixth connection comprises an eighth connection between the remote terminal and a relay terminal and a tenth connection between the relay terminal and a network device. The channel quality of the sixth connection may be determined based on the channel quality of the eighth connection and/or the channel quality of the tenth connection.

For example, the channel quality of the sixth connection is the channel quality of the eighth connection.

For another example, the channel quality of the sixth connection is the channel quality of the tenth connection.

For another example, the channel quality of the sixth connection is a maximum or minimum of the channel quality of the eighth connection and the channel quality of the tenth connection.

For another example, the channel quality of the sixth connection is a product of the channel quality of the eighth connection and the channel quality of the tenth connection.

Optionally, in some embodiments, the relay terminal to which the remote terminal is connected through the seventh connection and the eighth connection may be the same terminal, or may also be different terminals.

It should be understood that, for the specific implementation of selecting the target connection according to the channel qualities of the fifth connection and the sixth connection in the method 200, reference may be made to the specific implementation of selecting the target connection according to the channel qualities of the first connection and the second connection in the method 300, and details are not described here for brevity.

As an embodiment, determining an available connection of the fifth connection and the sixth connection based on the channel quality of the fifth connection and the channel quality of the sixth connection; the target connection is selected further based on the available connections.

For specific implementation of determining whether the fifth connection is available according to the channel quality of the fifth connection and determining whether the sixth connection is available according to the channel quality of the sixth connection, reference may be made to related implementation in the method 300, which is not described herein again.

As another embodiment, the fifth connection is selected as the target connection if the channel quality of the fifth connection is higher than a fifth threshold and the channel quality of the sixth connection is lower than a sixth threshold. In this case, in some embodiments, the sixth connection is a connection currently serving the remote terminal. Alternatively, the priority of the fifth connection is higher than the priority of the sixth connection.

As a further embodiment, if the channel quality of the fifth connection is below a seventh threshold and the channel quality of the sixth connection is above an eighth threshold, the sixth connection is selected as the target connection. In this case, in some embodiments, the fifth connection is a connection currently serving the remote terminal. Alternatively, the sixth connection has a higher priority than the fifth connection.

As a further embodiment, the fifth connection is selected as the target connection if the channel quality of the fifth connection is above a fifth threshold. In this case, in some embodiments, the sixth connection is a connection currently serving the remote terminal. Alternatively, the priority of the fifth connection is higher than the priority of the sixth connection.

As still another embodiment, the sixth connection is selected as the target connection if the channel quality of the sixth connection is higher than an eighth threshold. In this case, in some embodiments, the fifth connection is a connection currently serving the remote terminal. Alternatively, the sixth connection has a higher priority than the fifth connection.

Optionally, in this embodiment, the priority of the fifth connection may be a frequency priority to which the fifth connection belongs. The priority of the sixth connection may be a frequency priority to which said sixth connection belongs.

Therefore, in the embodiment of the present application, under the condition that there may be at least two relay connections between the remote device and the network device, the target connection is selected according to channel qualities of the at least two relay connections, and further, data transmission is performed with the network device through the target connection, which is beneficial to ensuring reliability of data transmission between the terminal device and the network device. And the flexible selection of connection under different scenes can be realized, which is beneficial to ensuring that the data transmission is carried out by selecting proper connection under different conditions, rather than fixedly using one connection for data transmission, and the data transmission performance can be improved.

While method embodiments of the present application are described in detail above with reference to fig. 3-6, apparatus embodiments of the present application are described in detail below with reference to fig. 7-10, it being understood that apparatus embodiments correspond to method embodiments and that similar descriptions may be had with reference to method embodiments.

Fig. 7 shows a schematic block diagram of an apparatus 400 for data transmission according to an embodiment of the application. As shown in fig. 7, the apparatus 400 includes:

a processing unit 410, configured to select a target connection from a first connection and a second connection, where the first connection is a connection where the device is directly connected to a network device, the second connection is a connection where the device is connected to the network device through a relay terminal, and the remote terminal and the relay terminal are connected through a sidelink.

Optionally, in some embodiments, the processing unit 410 is specifically configured to:

selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection.

Optionally, in some embodiments, the second connection includes a third connection between the device and the relay terminal and a fourth connection between the relay terminal and a network device, wherein a channel quality of the second connection is determined according to a channel quality of the third connection and/or a channel quality of the fourth connection.

Optionally, in some embodiments, the channel quality of the second connection is the channel quality of the third connection; or the channel quality of the second connection is the channel quality of the fourth connection; or the channel quality of the second connection is the maximum or minimum of the channel quality of the third connection and the channel quality of the fourth connection; or the channel quality of the second connection is the product of the channel quality of the third connection and the channel quality of the fourth connection.

Optionally, in some embodiments, the processing unit 410 is further configured to:

determining an available connection of the first connection and the second connection based on the channel quality of the first connection and the channel quality of the second connection; selecting the target connection based on the available connections.

determining whether the first connection is available based on the channel quality of the first connection and a first threshold.

determining that the first connection is available if the channel quality of the first connection is greater than or equal to the first threshold; or

Determining that the first connection is unavailable if the channel quality of the first connection is below the first threshold.

determining whether the second connection is available based on the channel quality of the second connection and a second threshold.

determining that the second connection is available if the channel quality of the second connection is greater than or equal to the second threshold; or

Determining that the second connection is unavailable if the channel quality of the second connection is below the second threshold.

if only the first connection is available, selecting the first connection as the target connection; or

Selecting the first connection as the target connection if only the second connection is available.

Optionally, the processing unit 410 is further configured to: selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection if both the first connection and the second connection are available.

Optionally, the processing unit 410 is specifically configured to: and if the channel quality of the first connection is higher than that of the second connection, selecting the first connection as the target connection.

Optionally, a difference between the channel quality of the first connection and the channel quality of the second connection is greater than a third threshold.

Optionally, the processing unit 410 is specifically configured to: selecting the second connection as the target connection if the channel quality of the first connection is lower than the channel quality of the second connection.

Optionally, a difference between the channel quality of the first connection and the channel quality of the second connection is smaller than a fourth threshold.

selecting the first connection as the target connection if the channel quality of the first connection is higher than a fifth threshold and the channel quality of the second connection is lower than a sixth threshold; or if the channel quality of the first connection is lower than a seventh threshold and the channel quality of the second connection is higher than an eighth threshold, selecting the first connection as the target connection.

Optionally, the fifth threshold is greater than the seventh threshold, and the sixth threshold is less than the eighth threshold.

Optionally, in some embodiments, the fifth threshold and the seventh threshold are determined according to a measurement result of a downlink reference signal, and the sixth threshold and the eighth threshold are determined according to a measurement result of a side-row reference signal and/or a downlink reference signal.

Optionally, in some embodiments, the first connection is a Uu connection, and the second connection includes a PC5 connection between the device and the relay terminal and a Uu connection between the relay terminal and a network device.

Optionally, in some embodiments, the target connection is for data transfer between the device and a network device.

Optionally, in some embodiments, the apparatus 400 further comprises:

and the communication unit is used for carrying out data transmission with the network equipment through the target connection.

Optionally, in some embodiments, the fifth connection is a connection currently serving a remote terminal.

Optionally, in some other embodiments, the sixth connection is a connection currently serving the remote terminal.

Optionally, in some embodiments, the priority of the fifth connection is higher than the priority of the sixth connection.

Optionally, in further embodiments, the sixth connection has a higher priority than the fifth connection.

Optionally, in some embodiments, the communication unit may be a communication interface or a transceiver, or an input/output interface of a communication chip or a system on a chip. The processing unit may be one or more processors.

It should be understood that the device 400 according to the embodiment of the present application may correspond to a remote terminal in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the device 400 are respectively for implementing a corresponding flow of the remote terminal in the method 300 shown in fig. 3, and are not described herein again for brevity.

Fig. 8 shows a schematic block diagram of an apparatus 500 for data transmission according to an embodiment of the application. As shown in fig. 8, the apparatus 500 includes:

a processing unit 510, configured to select a target connection from a fifth connection and a sixth connection, where the fifth connection is a connection where the remote end connects to the network device through the relay terminal, the sixth connection is a connection where the remote end connects to the network device through the relay terminal, the remote end and the relay terminal connect through a seventh connection, the remote end and the relay terminal further connect through an eighth connection, and the seventh connection and the eighth connection include a sidelink connection.

Optionally, in some embodiments, the processing unit 510 is further configured to:

selecting the target connection based on the channel quality of the fifth connection and the channel quality of the sixth connection.

Optionally, in some embodiments, the fifth connection includes the seventh connection between the remote terminal and the relay terminal and a ninth connection between the relay terminal and a network device, wherein a channel quality of the fifth connection is determined according to a channel quality of the seventh connection and/or a channel quality of the ninth connection.

Optionally, in some embodiments, the channel quality of the fifth connection is the channel quality of the seventh connection; or the channel quality of the fifth connection is the channel quality of the ninth connection; or the channel quality of the fifth connection is the maximum or minimum of the channel quality of the seventh connection and the channel quality of the ninth connection; or the channel quality of the fifth connection is the product of the channel quality of the seventh connection and the channel quality of the ninth connection.

Optionally, in some embodiments, the sixth connection includes an eighth connection between the remote terminal and the relay terminal and a tenth connection between the relay terminal and a network device, where a channel quality of the sixth connection is determined according to a channel quality of the eighth connection and/or a channel quality of the tenth connection.

Optionally, in some embodiments, the channel quality of the sixth connection is the channel quality of the eighth connection; or the channel quality of the sixth connection is the channel quality of the tenth connection; or the channel quality of the sixth connection is the maximum or minimum of the channel quality of the eighth connection and the channel quality of the tenth connection; or the channel quality of the sixth connection is the product of the channel quality of the eighth connection and the channel quality of the tenth connection.

determining an available connection of the fifth connection and the sixth connection according to the channel quality of the fifth connection and the channel quality of the sixth connection; selecting the target connection based on the available connections.

determining whether the fifth connection is available based on the channel quality of the fifth connection and a first threshold.

determining that the fifth connection is available if the channel quality of the fifth connection is greater than or equal to the first threshold; or

Determining that the fifth connection is unavailable if the channel quality of the fifth connection is below the first threshold.

determining whether the sixth connection is available based on the channel quality of the sixth connection and a second threshold.

determining that the sixth connection is available if the channel quality of the sixth connection is greater than or equal to the second threshold; or

Determining that the sixth connection is unavailable if the channel quality of the sixth connection is below the second threshold.

selecting the fifth connection as the target connection if the channel quality of the fifth connection is higher than a fifth threshold and the channel quality of the sixth connection is lower than a sixth threshold; or

And if the channel quality of the fifth connection is lower than a seventh threshold and the channel quality of the sixth connection is higher than an eighth threshold, selecting the sixth connection as the target connection.

selecting the fifth connection as the target connection if the channel quality of the fifth connection is higher than a fifth threshold; or

And if the channel quality of the sixth connection is higher than an eighth threshold, selecting the sixth connection as the target connection.

Optionally, in some embodiments, the fifth connection includes a PC5 connection between the remote terminal and the relay terminal and a Uu connection between the relay terminal and a network device; the sixth connection includes a PC5 connection between the remote terminal and the relay terminal and a Uu connection between the relay terminal and a network device.

Optionally, the target connection is used for data transmission between the remote terminal and a network device.

Optionally, in other embodiments, the sixth connection is a connection of a currently serving remote terminal.

Optionally, in some embodiments, the sixth connection has a higher priority than the fifth connection.

It should be understood that the device 500 according to the embodiment of the present application may correspond to a remote terminal in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the device 500 are respectively for implementing a corresponding flow of the remote terminal in the method 200 shown in fig. 6, and are not described herein again for brevity.

Fig. 9 is a schematic structural diagram of a communication device 800 according to an embodiment of the present application. The communication device 800 shown in fig. 9 comprises a processor 810, and the processor 810 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 9, the communication device 800 may also include a memory 820. From the memory 820, the processor 810 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 820 may be a separate device from the processor 810 or may be integrated into the processor 810.

Optionally, as shown in fig. 9, the communication device 800 may further include a transceiver 830, and the processor 810 may control the transceiver 830 to communicate with other devices, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

Transceiver 830 may include a transmitter and a receiver, among other things. The transceiver 830 may further include antennas, and the number of antennas may be one or more.

Optionally, the communication device 800 may specifically be a network device in the embodiment of the present application, and the communication device 800 may implement a corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the communication device 800 may specifically be a remote terminal in this embodiment, and the communication device 800 may implement a corresponding process implemented by the remote terminal in each method in this embodiment, and for brevity, details are not described here again.

Fig. 10 is a schematic configuration diagram of a circuit of an embodiment of the present application. The circuit 900 shown in fig. 10 includes a processor 910, and the processor 910 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 10, the circuit 900 may further include a memory 920. From the memory 920, the processor 910 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 920 may be a separate device from the processor 910, or may be integrated in the processor 910.

Optionally, the circuit 900 may also include an input interface 930. The processor 910 may control the input interface 930 to communicate with other devices or chips, and in particular, may obtain information or data transmitted by other devices or chips.

Optionally, the circuit 900 may further include an output interface 940. The processor 910 may control the output interface 940 to communicate with other devices or chips, and in particular, may output information or data to the other devices or chips.

Optionally, the circuit may be applied to the network device in the embodiment of the present application, and the circuit may implement the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the circuit may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the circuit may implement the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Alternatively, the circuits mentioned in the embodiments of the present application may also be circuits on a chip. The Chip may be, for example, a System-on-Chip (SOC) Chip, or the like.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, etc. as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), enhanced Synchronous SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memories are exemplary but not limiting illustrations, for example, the memories in the embodiments of the present application may also be Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced SDRAM, ESDRAM), synchronous Link DRAM (SLDRAM), direct Rambus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the application also provides a computer readable storage medium for storing the computer program.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the computer-readable storage medium may be applied to the remote terminal in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the remote terminal in each method in the embodiment of the present application, which is not described herein again for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions enable the computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity.

Optionally, the computer program product may be applied to a remote terminal in the embodiment of the present application, and the computer program instructions enable a computer to execute a corresponding process implemented by the remote terminal in each method in the embodiment of the present application, which is not described herein again for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the computer program may be applied to the remote terminal in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the remote terminal in each method in the embodiment of the present application, and for brevity, details are not described here again.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. With regard to such understanding, the technical solutions of the present application may be essentially implemented or contributed to by the prior art, or may be implemented in a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method of data transmission, comprising:

the method comprises the steps that a remote terminal selects target connection in first connection and second connection, wherein the first connection is the connection of the remote terminal directly connected with network equipment, the second connection is the connection of the remote terminal connected with the network equipment through a relay terminal, the remote terminal and the relay terminal are connected through third connection, and the third connection comprises sidelink connection.
The method of claim 1, wherein selecting, by the remote terminal, a target connection among the first connection and the second connection comprises:

selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection.
The method of claim 2, wherein the second connection comprises a third connection between the remote terminal and the relay terminal and a fourth connection between the relay terminal and a network device, and wherein a channel quality of the second connection is determined according to a channel quality of the third connection and/or a channel quality of the fourth connection.
A method according to claim 3, characterized in that the channel quality of the second connection is the channel quality of the third connection; or

The channel quality of the second connection is the channel quality of the fourth connection; or

The channel quality of the second connection is a maximum or minimum of the channel quality of the third connection and the channel quality of the fourth connection; or

The channel quality of the second connection is the product of the channel quality of the third connection and the channel quality of the fourth connection.
The method according to any of claims 2-4, wherein said selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection comprises:

determining an available connection of the first connection and the second connection based on the channel quality of the first connection and the channel quality of the second connection;

selecting the target connection based on the available connections.
The method of claim 5, wherein determining the available one of the first connection and the second connection based on the channel quality of the first connection and the channel quality of the second connection comprises:

determining whether the first connection is available based on the channel quality of the first connection and a first threshold.
The method of claim 6, wherein the determining whether the first connection is available based on the channel quality of the first connection and a first threshold comprises:

determining that the first connection is available if the channel quality of the first connection is greater than or equal to the first threshold; or

Determining that the first connection is unavailable if the channel quality of the first connection is below the first threshold.
The method according to any of claims 5-7, wherein said determining available ones of said first connection and said second connection based on a channel quality of said first connection and a channel quality of said second connection comprises: determining whether the second connection is available based on the channel quality of the second connection and a second threshold.
The method of claim 8, wherein the determining whether the second connection is available based on the channel quality of the second connection and a second threshold comprises:

determining that the second connection is available if the channel quality of the second connection is greater than or equal to the second threshold; or

Determining that the second connection is unavailable if the channel quality of the second connection is below the second threshold.
The method according to any of claims 5-9, wherein said selecting said target connection based on said available connections comprises: if only the first connection is available, selecting the first connection as the target connection; or if only the second connection is available, selecting the first connection as the target connection.
The method according to any of claims 5-10, wherein said selecting said target connection based on said available connections comprises: selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection if both the first connection and the second connection are available.
The method according to any of claims 2-11, wherein said selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection comprises: and if the channel quality of the first connection is higher than that of the second connection, selecting the first connection as the target connection.
The method of claim 12, wherein a difference between the channel quality of the first connection and the channel quality of the second connection is greater than a third threshold.
The method according to any of claims 2-11, wherein said selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection comprises: selecting the second connection as the target connection if the channel quality of the first connection is lower than the channel quality of the second connection.
The method of claim 14, wherein a difference between the channel quality of the first connection and the channel quality of the second connection is less than a fourth threshold.
The method according to any of claims 2-11, wherein said selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection comprises:

selecting the first connection as the target connection if the channel quality of the first connection is higher than a fifth threshold and the channel quality of the second connection is lower than a sixth threshold; or

And if the channel quality of the first connection is lower than a seventh threshold and the channel quality of the second connection is higher than an eighth threshold, selecting the second connection as the target connection.
The method according to any of claims 2-11, wherein said selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection comprises:

selecting the first connection as the target connection if the channel quality of the first connection is higher than a fifth threshold; or

And if the channel quality of the second connection is higher than an eighth threshold, selecting the second connection as the target connection.
The method of claim 16 or 17, wherein the fifth threshold is greater than the seventh threshold, and wherein the sixth threshold is less than the eighth threshold.
The method according to any of claims 16-18, wherein the fifth threshold and the seventh threshold are determined from measurements of downlink reference signals, and wherein the sixth threshold and the eighth threshold are determined from measurements of sidelink reference signals and/or downlink reference signals.
The method of any of claims 1-19, wherein the first connection is a Uu connection, and wherein the second connection comprises a PC5 connection between the remote terminal and the relay terminal and a Uu connection between the relay terminal and a network device.
The method according to any of claims 1-20, wherein the target connection is used for data transmission between the remote terminal and a network device.
A method according to any of claims 1-21, characterized in that said second connection is the connection currently serving the remote terminal.
A method according to any of claims 1-21, characterized in that said first connection is a connection currently serving a remote terminal.
The method according to any of claims 1-23, wherein the first connection has a higher priority than the second connection.
The method according to any of claims 1-23, wherein the second connection has a higher priority than the second connection.
A method of data transmission, comprising:

the method comprises the steps that a far-end terminal selects target connection in fifth connection and sixth connection, wherein the fifth connection is the connection of the far-end terminal with network equipment through a relay terminal, the sixth connection is the connection of the far-end terminal with the network equipment through the relay terminal, the far-end terminal and the relay terminal are connected through seventh connection, the far-end terminal and the relay terminal are further connected through eighth connection, and the seventh connection and the eighth connection comprise sidelink connection.
The method of claim 26, wherein the remote terminal selects a target connection among a fifth connection and a sixth connection, comprising:

selecting the target connection based on the channel quality of the fifth connection and the channel quality of the sixth connection.
The method of claim 27, wherein the fifth connection comprises the seventh connection between the remote terminal and the relay terminal and a ninth connection between the relay terminal and a network device, and wherein a channel quality of the fifth connection is determined according to a channel quality of the seventh connection and/or a channel quality of the ninth connection.
The method according to claim 28, characterized in that the channel quality of said fifth connection is the channel quality of said seventh connection; or the channel quality of the fifth connection is the channel quality of the ninth connection; or the channel quality of the fifth connection is the maximum or minimum of the channel quality of the seventh connection and the channel quality of the ninth connection; or the channel quality of the fifth connection is the product of the channel quality of the seventh connection and the channel quality of the ninth connection.
The method according to any of claims 27-29, wherein the sixth connection comprises an eighth connection between the remote terminal and the relay terminal and a tenth connection between the relay terminal and a network device, wherein the channel quality of the sixth connection is determined according to the channel quality of the eighth connection and/or the channel quality of the tenth connection.
The method according to claim 30, characterised in that the channel quality of the sixth connection is the channel quality of the eighth connection; or the channel quality of the sixth connection is the channel quality of the tenth connection; or the channel quality of the sixth connection is the maximum or minimum of the channel quality of the eighth connection and the channel quality of the tenth connection; or the channel quality of the sixth connection is the product of the channel quality of the eighth connection and the channel quality of the tenth connection.
The method according to any of claims 27-31, wherein said selecting said target connection based on the channel quality of said fifth connection and the channel quality of said sixth connection comprises:

determining an available connection of the fifth connection and the sixth connection based on the channel quality of the fifth connection and the channel quality of the sixth connection; and selecting the target connection based on the available connections.
The method of claim 32, wherein determining the available one of the fifth connection and the sixth connection based on the channel quality of the fifth connection and the channel quality of the sixth connection comprises:

determining whether the fifth connection is available based on the channel quality of the fifth connection and a first threshold.
The method of claim 33, wherein the determining whether the fifth connection is available according to the channel quality of the fifth connection and a first threshold comprises:

determining that the fifth connection is available if the channel quality of the fifth connection is greater than or equal to the first threshold; or

Determining that the fifth connection is unavailable if the channel quality of the fifth connection is below the first threshold.
A method according to any of claims 32-34, wherein said determining available ones of said fifth connection and said sixth connection based on said channel quality of said fifth connection and said channel quality of said sixth connection comprises: determining whether the sixth connection is available based on the channel quality of the sixth connection and a second threshold.
The method of claim 35, wherein the determining whether the sixth connection is available according to the channel quality of the sixth connection and a second threshold comprises:

determining that the sixth connection is available if the channel quality of the sixth connection is greater than or equal to the second threshold; or

Determining that the sixth connection is unavailable if the channel quality of the sixth connection is below the second threshold.
The method according to any of claims 27-31, wherein said selecting said target connection based on the channel quality of said fifth connection and the channel quality of said sixth connection comprises:

selecting the fifth connection as the target connection if the channel quality of the fifth connection is higher than a fifth threshold and the channel quality of the sixth connection is lower than a sixth threshold; or

And if the channel quality of the fifth connection is lower than a seventh threshold and the channel quality of the sixth connection is higher than an eighth threshold, selecting the sixth connection as the target connection.
The method according to any of claims 27-31, wherein said selecting said target connection based on the channel quality of said fifth connection and the channel quality of said sixth connection comprises:

selecting the fifth connection as the target connection if the channel quality of the fifth connection is higher than a fifth threshold; or

And if the channel quality of the sixth connection is higher than an eighth threshold, selecting the sixth connection as the target connection.
The method of claim 37 or 38, wherein the fifth threshold is greater than the seventh threshold, and wherein the sixth threshold is less than the eighth threshold.
The method according to claim 38 or 39, wherein the fifth threshold and the seventh threshold are determined according to a measurement result of a downlink reference signal, and the sixth threshold and the eighth threshold are determined according to a measurement result of a side-row reference signal and/or a downlink reference signal.
A method according to any of claims 26 to 40, wherein the fifth connection comprises a PC5 connection between the remote terminal and the relay terminal and a Uu connection between the relay terminal and a network device;

the sixth connection includes a PC5 connection between the remote terminal and the relay terminal and a Uu connection between the relay terminal and the network device.
The method of any of claims 26-41, wherein the target connection is used for data transfer between the remote terminal and a network device.
A method according to any of claims 26-42, wherein said fifth connection is the connection currently serving the remote terminal.
A method according to any of claims 26-42, wherein the sixth connection is the connection currently serving the remote terminal.
The method according to any of claims 26-44, wherein the priority of the fifth connection is higher than the priority of the sixth connection.
The method according to any of claims 26-44, wherein the sixth connection has a higher priority than the fifth connection.
An apparatus for data transmission, comprising:

the system comprises a processing unit and a relay terminal, wherein the processing unit is used for selecting target connection in first connection and second connection, the first connection is the connection of the equipment directly connected with the network equipment, the second connection is the connection of the equipment connected with the network equipment through the relay terminal, the remote terminal is connected with the relay terminal through third connection, and the third connection comprises sidelink connection.
The device according to claim 47, wherein the processing unit is specifically configured to:

selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection.
The device of claim 48, wherein the second connection comprises a third connection between the device and the relay terminal and a fourth connection between the relay terminal and a network device, and wherein a channel quality of the second connection is determined according to a channel quality of the third connection and/or a channel quality of the fourth connection.
The apparatus of claim 49, wherein the channel quality of the second connection is the channel quality of the third connection; or the channel quality of the second connection is the channel quality of the fourth connection; or the channel quality of the second connection is the maximum or minimum of the channel quality of the third connection and the channel quality of the fourth connection; or the channel quality of the second connection is the product of the channel quality of the third connection and the channel quality of the fourth connection.
The device of any one of claims 48-50, wherein the processing unit is further configured to: determining an available connection of the first connection and the second connection based on the channel quality of the first connection and the channel quality of the second connection;

selecting the target connection based on the available connections.
The device of claim 51, wherein the processing unit is further configured to:

determining whether the first connection is available based on the channel quality of the first connection and a first threshold.
The device according to claim 52, wherein the processing unit is specifically configured to:

determining that the first connection is available if the channel quality of the first connection is greater than or equal to the first threshold; or

Determining that the first connection is unavailable if the channel quality of the first connection is below the first threshold.
The device of any one of claims 51-53, wherein the processing unit is further configured to: determining whether the second connection is available based on the channel quality of the second connection and a second threshold.
The device according to claim 54, wherein the processing unit is specifically configured to:

determining that the second connection is available if the channel quality of the second connection is greater than or equal to the second threshold; or

Determining that the second connection is unavailable if the channel quality of the second connection is below the second threshold.
The device of any one of claims 51-55, wherein the processing unit is further configured to: if only the first connection is available, selecting the first connection as the target connection; or alternatively

Selecting the first connection as the target connection if only the second connection is available.
The device of any one of claims 51-55, wherein the processing unit is further configured to: selecting the target connection based on the channel quality of the first connection and the channel quality of the second connection if both the first connection and the second connection are available.
The device according to any one of claims 48 to 57, wherein the processing unit is specifically configured to: selecting the first connection as the target connection if the channel quality of the first connection is higher than the channel quality of the second connection.
The apparatus of claim 58, wherein a difference between the channel quality of the first connection and the channel quality of the second connection is greater than a third threshold.
The device according to any of claims 48-57, wherein the processing unit is specifically configured to: selecting the second connection as the target connection if the channel quality of the first connection is lower than the channel quality of the second connection.
The apparatus of claim 60, wherein a difference between the channel quality of the first connection and the channel quality of the second connection is less than a fourth threshold.
The device according to any of claims 48-57, wherein the processing unit is specifically configured to: selecting the first connection as the target connection if the channel quality of the first connection is higher than a fifth threshold and the channel quality of the second connection is lower than a sixth threshold; or

And if the channel quality of the first connection is lower than a seventh threshold and the channel quality of the second connection is higher than an eighth threshold, selecting the first connection as the target connection.
The device according to any one of claims 48 to 57, wherein the processing unit is specifically configured to: selecting the first connection as the target connection if the channel quality of the first connection is higher than a fifth threshold; or

And if the channel quality of the second connection is higher than an eighth threshold, selecting the second connection as the target connection.
The apparatus of claim 62 or 63, wherein the fifth threshold is greater than the seventh threshold, and wherein the sixth threshold is less than the eighth threshold.
The device according to any of claims 62-64, wherein the fifth threshold and the seventh threshold are determined based on measurements of downlink reference signals, and wherein the sixth threshold and the eighth threshold are determined based on measurements of sidelink reference signals and/or downlink reference signals.
The device of any of claims 47-65, wherein the first connection is a Uu connection, and wherein the second connection comprises a PC5 connection between the device and the relay terminal and a Uu connection between the relay terminal and a network device.
The device of any of claims 47-66, wherein the target connection is used for data transfer between the device and a network device.
An arrangement according to any of claims 47-67, characterised in that said second connection is the connection currently serving the remote terminal.
An arrangement according to any of claims 47-67, characterised in that said first connection is the connection currently serving the remote terminal.
The apparatus of any of claims 47-69, wherein the first connection has a higher priority than the second connection.
The apparatus of any of claims 47-69, wherein the second connection has a higher priority than the second connection.
An apparatus for data transmission, comprising:

and the processing unit is used for selecting target connection in fifth connection and sixth connection, wherein the fifth connection is the connection of the remote terminal with the network equipment through the relay terminal, the sixth connection is the connection of the remote terminal with the network equipment through the relay terminal, the remote terminal and the relay terminal are connected through seventh connection, the remote terminal and the relay terminal are further connected through eighth connection, and the seventh connection and the eighth connection comprise sidelink connection.
The device of claim 72, wherein the processing unit is further configured to:

selecting the target connection based on the channel quality of the fifth connection and the channel quality of the sixth connection.
The device of claim 73, wherein the fifth connection comprises the seventh connection between the remote terminal and the relay terminal and a ninth connection between the relay terminal and a network device, and wherein a channel quality of the fifth connection is determined according to a channel quality of the seventh connection and/or a channel quality of the ninth connection.
The apparatus according to claim 74, wherein the channel quality of the fifth connection is the channel quality of the seventh connection; or the channel quality of the fifth connection is the channel quality of the ninth connection; or the channel quality of the fifth connection is the maximum or minimum of the channel quality of the seventh connection and the channel quality of the ninth connection; or the channel quality of the fifth connection is the product of the channel quality of the seventh connection and the channel quality of the ninth connection.
The device according to any of claims 73-75, wherein the sixth connection comprises an eighth connection between the remote terminal and the relay terminal and a tenth connection between the relay terminal and a network device, wherein the channel quality of the sixth connection is determined according to the channel quality of the eighth connection and/or the channel quality of the tenth connection.
The apparatus according to claim 76, wherein the channel quality of the sixth connection is the channel quality of the eighth connection; or the channel quality of the sixth connection is the channel quality of the tenth connection; the channel quality of the sixth connection is the maximum or minimum of the channel quality of the eighth connection and the channel quality of the tenth connection; or the channel quality of the sixth connection is the product of the channel quality of the eighth connection and the channel quality of the tenth connection.
The apparatus of any one of claims 73-77, wherein the processing unit is further configured to:

determining an available connection of the fifth connection and the sixth connection according to the channel quality of the fifth connection and the channel quality of the sixth connection; and selecting the target connection based on the available connections.
The device of claim 78, wherein the processing unit is further configured to:

determining whether the fifth connection is available based on the channel quality of the fifth connection and a first threshold.
The device of claim 79, wherein the processing unit is further configured to:

determining that the fifth connection is available if the channel quality of the fifth connection is greater than or equal to the first threshold; or

Determining that the fifth connection is unavailable if the channel quality of the fifth connection is below the first threshold.
The device of any one of claims 78-80, wherein the processing unit is further configured to:

determining whether the sixth connection is available based on the channel quality of the sixth connection and a second threshold.
The device of claim 81, wherein the processing unit is further configured to:

determining that the sixth connection is available if the channel quality of the sixth connection is greater than or equal to the second threshold; or

Determining that the sixth connection is unavailable if the channel quality of the sixth connection is below the second threshold.
The apparatus of any one of claims 73-77, wherein the processing unit is further configured to:

selecting the fifth connection as the target connection if the channel quality of the fifth connection is higher than a fifth threshold and the channel quality of the sixth connection is lower than a sixth threshold; or

And if the channel quality of the fifth connection is lower than a seventh threshold and the channel quality of the sixth connection is higher than an eighth threshold, selecting the sixth connection as the target connection.
The apparatus of any one of claims 73-77, wherein the processing unit is further configured to:

selecting the fifth connection as the target connection if the channel quality of the fifth connection is higher than a fifth threshold; or

Selecting the sixth connection as the target connection if the channel quality of the sixth connection is higher than an eighth threshold.
The device of claim 83 or 84, wherein the fifth threshold is greater than the seventh threshold, and wherein the sixth threshold is less than the eighth threshold.
The device according to any of claims 83-85, wherein the fifth and seventh thresholds are determined from measurements of downlink reference signals, and wherein the sixth and eighth thresholds are determined from measurements of sidelink reference signals and/or downlink reference signals.
The device according to any of claims 72-86, wherein the fifth connection comprises a PC5 connection between the remote terminal and the relay terminal and a Uu connection between the relay terminal and a network device;

the sixth connection includes a PC5 connection between the remote terminal and the relay terminal and a Uu connection between the relay terminal and the network device.
The device of any one of claims 72-87, wherein the target connection is used for data transfer between the remote terminal and a network device.
The arrangement according to any of claims 72-88, characterised in that said fifth connection is the connection currently serving the remote terminal.
The device according to any of claims 72-88, wherein said sixth connection is a connection currently serving a remote terminal.
The apparatus of any of the claims 72-90, wherein the priority of the fifth connection is higher than the priority of the sixth connection.
The apparatus of any of the claims 72-90, wherein the priority of the sixth connection is higher than the priority of the fifth connection.
An apparatus, comprising: a processor and a memory for storing a computer program, the processor being adapted to invoke and execute the computer program stored in the memory to perform the method of any of claims 1 to 25.
A circuit, comprising: a processor for invoking and running a computer program from a memory, causing a device on which the circuitry is installed to perform the method of any of claims 1-20.
A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 1 to 25.
A computer program product comprising computer program instructions to cause a computer to perform the method of any one of claims 1 to 25.
A computer program, characterized in that the computer program causes a computer to perform the method according to any of claims 1 to 25.
An apparatus, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 26 to 46.
A circuit, comprising: a processor for retrieving from memory and executing a computer program to cause a device in which the circuitry is installed to perform the method of any of claims 26 to 46.
A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 26 to 46.
A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 26 to 46.
A computer program, characterized in that the computer program causes a computer to perform the method according to any of claims 26 to 46.