CN114449539B - Beam training method, device and storage medium - Google Patents
Beam training method, device and storage medium Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H04L5/00—Arrangements affording multiple use of the transmission path
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- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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Abstract
The present application relates to the field of communications technologies, and in particular, to a beam training method, apparatus, and storage medium. The method comprises the following steps: the first equipment receives first configuration information, wherein the first configuration information indicates a first time-frequency resource and a second time-frequency resource, the time-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are the same, and the frequency-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are different; the first device receives and measures a first reference signal on a first time-frequency resource using a first spatial reception filtering parameter in a target time unit, and performs energy detection and/or signal detection on a second time-frequency resource using the first spatial reception filtering parameter, the energy detection and/or signal detection being used to perform LBT of an unlicensed channel. The embodiment of the application saves the LBT overhead, reduces the time delay of the beam training process and reduces the probability of being interrupted by other devices on an unlicensed frequency band by multiplexing the time for executing the LBT and the time for measuring the first reference signal.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a beam training method, apparatus, and storage medium.
Background
Unlicensed bands are generally used for free, and access to the unlicensed bands does not require authorization, which is well suited for network deployment in a Side Link (SL) system, which does not require infrastructure and high dynamics.
At present, the unlicensed millimeter wave frequency band has higher frequency and larger channel loss attenuation, and the wave beam is formed in a specific direction by utilizing a multi-antenna architecture to improve the channel gain of transmission, so that the signal-to-noise ratio required by normal communication is ensured. In general, the position between the two transmitting and receiving ends and the information such as multipath transmission of the signal in space are unknown, and the reference signal needs to be measured by continuously switching the beam direction to determine the optimal beam direction, namely, the beam training process is completed.
However, in the above method, the beam direction needs to be frequently switched in the beam training process, and in consideration of the problem of fair access on the unlicensed frequency band, the device needs to perform a new directional listen before talk (listen before talk, LBT) process before transmitting the reference signal in each beam direction, so that many extra delays are introduced to the beam training process, and if the channel is occupied by other devices on the unlicensed frequency band in the process of performing LBT, the beam training process is also interrupted.
Disclosure of Invention
In view of this, a beam training method, apparatus and storage medium are provided. The embodiment of the application saves the LBT overhead, reduces the time delay of the beam training process and reduces the probability of being interrupted by other devices on an unlicensed frequency band by multiplexing the time for executing the LBT and the time for measuring the first reference signal.
In a first aspect, an embodiment of the present application provides a beam training method, including:
the method comprises the steps that first equipment receives first configuration information, wherein the first configuration information indicates first time-frequency resources and second time-frequency resources, the time-domain resources corresponding to the first time-frequency resources and the second time-frequency resources are the same, and the frequency-domain resources corresponding to the first time-frequency resources and the second time-frequency resources are different;
the first device receives and measures a first reference signal on the first time-frequency resource by adopting a first space receiving filtering parameter in a target time unit, and performs energy detection and/or signal detection on the second time-frequency resource by adopting the first space receiving filtering parameter, wherein the energy detection and/or the signal detection is used for executing LBT of an unauthorized channel; the target time unit is a time unit where the first time-frequency resource and the second time-frequency resource are located.
In the implementation manner, after receiving the first configuration information indicating the first time-frequency resource and the second time-frequency resource, the first device receives and measures the first reference signal on the first time-frequency resource by adopting the first space receiving filtering parameter in the target time unit, and performs energy detection and/or signal detection on the second time-frequency resource by adopting the first space receiving filtering parameter, namely multiplexing the time for executing LBT and the time for measuring the first reference signal, thereby saving LBT expenditure, reducing the time delay of the beam training process and reducing the probability of being interrupted by other devices on an unlicensed frequency band.
With reference to the first aspect, in one possible implementation manner of the first aspect, the first time-frequency resource is a configured first reference signal time-frequency resource for beam training, and the second time-frequency resource is a configured second reference signal time-frequency resource for interference measurement (interference measurement, IM).
In the implementation manner, the first time-frequency resource of the first reference signal and the second time-frequency resource of the second reference signal are configured jointly, so that the LBT is executed while the beam training is carried out, the time overhead of the LBT is reduced, and the success rate of the LBT is improved.
In another possible implementation manner of the first aspect, the first configuration information further includes a first identifier and/or a second identifier, where the first identifier indicates that the first device reports at least one beam measurement result corresponding to the first reference signal, and the second identifier indicates whether the first device reports a corresponding interference measurement result on the second time-frequency resource.
In this implementation manner, the first device is instructed to report at least one identifier corresponding to the first reference signal and a corresponding reference signal received power (Reference signal received power, RSRP) quantization result and/or an identifier corresponding to the second reference signal and a corresponding RSRP quantization result through the first configuration information, so that the peer device can learn a beam measurement result and/or an interference measurement result. In another possible implementation manner of the first aspect, the time-frequency resources of the unlicensed channel include the first time-frequency resource and the second time-frequency resource, and the performing energy detection and/or signal detection on the second time-frequency resource using the first spatial reception filtering parameter includes:
performing interference measurement on the second time-frequency resource by adopting the first space receiving filter parameter to obtain a first power measurement value;
Converting the first power measurement to a second power measurement of the unlicensed channel;
the method further comprises the steps of:
and when the second power measurement value is smaller than the power measurement threshold value, the first device transmits information on the unlicensed channel.
In this implementation manner, since the time-frequency resources of the unlicensed channel include a first time-frequency resource and a second time-frequency resource, after interference measurement is performed on the second time-frequency resource by using the first spatial reception filtering parameter to obtain a first power measurement value, the first power measurement value is converted into a second power measurement value of the unlicensed channel, and whether the unlicensed channel is idle is determined according to the magnitude relation between the second power measurement value and the power measurement threshold value. When the second power measured value is smaller than the power measured threshold value, the fact that the unauthorized channel is idle is indicated, that is, no other equipment on the unauthorized channel is used for transmitting information is confirmed, and the first equipment transmits information on the unauthorized channel, so that the information transmission effect is guaranteed.
In another possible implementation manner of the first aspect, when the second power measurement value is smaller than the power measurement threshold value, the information transmission by the first device on the unlicensed channel includes:
When the second power measurement value is smaller than the power measurement threshold value, the first device adopts a second space to transmit a third reference signal or data in a second time unit;
the second time unit is a time unit after the target time unit, and the second spatial transmission filtering parameter is a spatial transmission filtering parameter corresponding to the first spatial reception filtering parameter.
In the implementation manner, after the first device determines that the second power measurement value is smaller than the power measurement threshold value, the first device is used as a side uplink transmitting end device in a time unit after the target time unit, and a second spatial transmission filtering parameter is adopted to transmit a third reference signal or data, wherein the second spatial transmission filtering parameter is a spatial transmission filtering parameter corresponding to the first spatial reception filtering parameter, so that the beam range transmitted by the first device under the second spatial transmission filtering parameter is a subset of the beam range received by the first device under the first spatial reception filtering parameter, and the reliability of information transmission is improved.
In another possible implementation manner of the first aspect, the method further includes:
The first device sends second configuration information, the second configuration information indicates a third time-frequency resource and a fourth time-frequency resource, the time-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are the same and the frequency-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are different, the third time-frequency resource is used for sending a third reference signal, and the fourth time-frequency resource indicates a time-frequency position for energy detection and/or signal detection.
In the implementation manner, after the first device determines that the second power measurement value is smaller than the power measurement threshold value, the first device is used as the side uplink transmitting end device in a time unit after the target time unit, and transmits second configuration information indicating the third time-frequency resource and the fourth time-frequency resource, so that the opposite end device executes LBT while measuring the third reference signal, LBT expenditure of the opposite end device is saved, and time delay of a beam training process is reduced.
In a second aspect, an embodiment of the present application provides a beam training method, where the method includes:
the second equipment sends first configuration information, wherein the first configuration information indicates a first time-frequency resource and a second time-frequency resource, the time-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are the same, and the frequency-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are different;
The first time-frequency resource is used for transmitting a first reference signal, and the second time-frequency resource indicates a time-frequency position for performing energy detection and/or signal detection, wherein the energy detection and/or the signal detection is used for performing Listen Before Talk (LBT) of an unlicensed channel.
In a possible implementation manner of the second aspect, the first time-frequency resource is a first reference signal time-frequency resource configured for beam training, and the second time-frequency resource is a second reference signal time-frequency resource configured for interference measurement IM.
In another possible implementation manner of the second aspect, the first configuration information further includes a first identifier and/or a second identifier, where the first identifier indicates that the first device reports a beam measurement result corresponding to at least one first reference signal, and the second identifier indicates whether the first device reports an interference measurement result corresponding to the second time-frequency resource.
In this implementation manner, the first device is instructed to report at least one identifier corresponding to the first reference signal and a corresponding RSRP quantization result and/or at least one identifier corresponding to the second reference signal and a corresponding RSRP quantization result through the first configuration information, so that the second device can learn a beam measurement result and/or an interference measurement result. In another possible implementation manner of the second aspect, the time-frequency resources of the unlicensed channel include the first time-frequency resources and the second time-frequency resources.
In another possible implementation manner of the second aspect, the method further includes:
the second device receives a third reference signal or data in a second time unit, wherein the second time unit is a time unit after a target time unit, and the target time unit is a time unit in which the first time-frequency resource and the second time-frequency resource are located.
In another possible implementation manner of the second aspect, the method further includes:
the second device receives second configuration information, wherein the second configuration information indicates a third time-frequency resource and a fourth time-frequency resource, the time-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are the same and the frequency-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are different, the third time-frequency resource is used for sending a third reference signal, and the fourth time-frequency resource indicates a time-frequency position for energy detection and/or signal detection.
In a third aspect, a beam training apparatus is provided, the apparatus comprising at least one unit for implementing the beam training method provided by the first aspect or any one of the possible implementation manners of the first aspect.
In a fourth aspect, a beam training apparatus is provided, the apparatus comprising at least one unit for implementing the beam training method provided in the second aspect or any one of the possible implementations of the second aspect.
In a fifth aspect, an embodiment of the present application provides a beam training apparatus, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to:
receiving first configuration information, wherein the first configuration information indicates a first time-frequency resource and a second time-frequency resource, and the time-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are the same and the frequency-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are different;
receiving and measuring a first reference signal on the first time-frequency resource by adopting a first space receiving filter parameter in a target time unit, and carrying out energy detection and/or signal detection on the second time-frequency resource by adopting the first space receiving filter parameter, wherein the energy detection and/or the signal detection is used for executing LBT of an unauthorized channel; the target time unit is a time unit where the first time-frequency resource and the second time-frequency resource are located.
In a possible implementation manner of the fifth aspect, the first time-frequency resource is a first reference signal time-frequency resource configured for beam training, and the second time-frequency resource is a second reference signal time-frequency resource configured for interference measurement IM.
In another possible implementation manner of the fifth aspect, the first configuration information further includes a first identifier and/or a second identifier, where the first identifier indicates that the first device reports a beam measurement result corresponding to at least one first reference signal, and the second identifier indicates whether the first device reports a corresponding interference measurement result on the second time-frequency resource.
In this implementation manner, the first device is instructed to report at least one identifier corresponding to the first reference signal and a corresponding RSRP quantization result and/or at least one identifier corresponding to the second reference signal and a corresponding RSRP quantization result through the first configuration information. In another possible implementation manner of the fifth aspect, the time-frequency resources of the unlicensed channel include the first time-frequency resources and the second time-frequency resources, and the processor is further configured to:
performing interference measurement on the second time-frequency resource by adopting the first space receiving filter parameter to obtain a first power measurement value;
converting the first power measurement to a second power measurement of the unlicensed channel;
and when the second power measurement value is smaller than the power measurement threshold value, information transmission is carried out on the unauthorized channel.
In another possible implementation manner of the fifth aspect, the processor is further configured to:
when the second power measurement value is smaller than the power measurement threshold value, a second space transmission filter parameter is adopted to transmit a third reference signal or data in a second time unit;
the second time unit is a time unit after the target time unit, and the second spatial transmission filtering parameter is a spatial transmission filtering parameter corresponding to the first spatial reception filtering parameter.
In another possible implementation manner of the fifth aspect, the processor is further configured to:
transmitting second configuration information, wherein the second configuration information indicates a third time-frequency resource and a fourth time-frequency resource, the time-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are the same and the frequency-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are different, the third time-frequency resource is used for transmitting a third reference signal, and the fourth time-frequency resource indicates a time-frequency position for energy detection and/or signal detection.
In a sixth aspect, an embodiment of the present application provides a beam training apparatus, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to:
Transmitting first configuration information, wherein the first configuration information indicates a first time-frequency resource and a second time-frequency resource, and the time-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are the same and the frequency-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are different;
the first time-frequency resource is used for transmitting a first reference signal, and the second time-frequency resource indicates a time-frequency position for performing energy detection and/or signal detection, wherein the energy detection and/or the signal detection is used for performing Listen Before Talk (LBT) of an unlicensed channel.
In a possible implementation manner of the sixth aspect, the first time-frequency resource is a first reference signal time-frequency resource configured for beam training, and the second time-frequency resource is a second reference signal time-frequency resource configured for interference measurement IM.
In another possible implementation manner of the sixth aspect, the first configuration information further includes a first identifier and/or a second identifier, where the first identifier indicates that the first device reports a beam measurement result corresponding to at least one first reference signal, and the second identifier indicates whether the first device reports an interference measurement result corresponding to the second time-frequency resource.
In this implementation manner, the first device is instructed to report at least one identifier corresponding to the first reference signal and a corresponding RSRP quantization result and/or at least one identifier corresponding to the second reference signal and a corresponding RSRP quantization result through the first configuration information. In another possible implementation manner of the sixth aspect, the time-frequency resources of the unlicensed channel include the first time-frequency resources and the second time-frequency resources.
In another possible implementation manner of the sixth aspect, the processor is further configured to:
and receiving a third reference signal or data in a second time unit, wherein the second time unit is a time unit after a target time unit, and the target time unit is a time unit in which the first time-frequency resource and the second time-frequency resource are located.
In another possible implementation manner of the sixth aspect, the processor is further configured to:
receiving second configuration information, wherein the second configuration information indicates a third time-frequency resource and a fourth time-frequency resource, the time-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are the same and the frequency-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are different, the third time-frequency resource is used for sending a third reference signal, and the fourth time-frequency resource indicates a time-frequency position for energy detection and/or signal detection.
In a seventh aspect, embodiments of the present application provide a non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement a beam training method provided by the first aspect or any one of the possible implementations of the first aspect.
In an eighth aspect, embodiments of the present application provide a non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement a beam training method provided by the second aspect or any one of the possible implementations of the second aspect.
In a ninth aspect, embodiments of the present application provide a computer program product comprising computer readable code, or a non-transitory computer readable storage medium carrying computer readable code, which when run in an electronic device, a processor in the electronic device performs the beam training method provided by the first aspect or any one of the possible implementations of the first aspect.
In a tenth aspect, embodiments of the present application provide a computer program product comprising computer readable code, or a non-transitory computer readable storage medium carrying computer readable code, which when run in an electronic device, a processor in the electronic device performs the beam training method provided by the second aspect or any one of the possible implementations of the second aspect.
In an eleventh aspect, an embodiment of the present application provides a beam training system, where the system includes a first device and a second device, where the first device is configured to perform the beam training method provided by the first aspect or any one of the possible implementations of the first aspect, and the second device is configured to perform the beam training method provided by the second aspect or any one of the possible implementations of the second aspect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the application and together with the description, serve to explain the principles of the application.
Fig. 1a shows a schematic diagram of a network architecture to which embodiments of the present application may be applied.
Fig. 1b shows a schematic diagram of another network architecture to which embodiments of the present application may be applied.
Fig. 2 shows a schematic diagram of another network architecture to which embodiments of the present application may be applied.
Fig. 3 is a flow chart illustrating a method of beam training according to an exemplary embodiment.
Fig. 4 is a schematic diagram illustrating a time-frequency resource allocation manner according to an exemplary embodiment.
Fig. 5 is a schematic diagram illustrating a beam training method according to an exemplary embodiment.
Fig. 6 is a schematic diagram illustrating a time-frequency resource allocation manner according to another exemplary embodiment.
Fig. 7 is a flow chart illustrating a method of beam training according to another exemplary embodiment.
Fig. 8 shows a block diagram of a beam training apparatus provided by an exemplary embodiment of the present application.
Fig. 9 shows a block diagram of a beam training apparatus provided by another exemplary embodiment of the present application.
Fig. 10 is a schematic diagram illustrating a configuration of a side-uplink communication user equipment according to an exemplary embodiment of the present application.
Detailed Description
Various exemplary embodiments, features and aspects of the application will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, numerous specific details are set forth in the following description in order to provide a better illustration of the application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present application.
A description will first be given of several terms that are referred to herein.
1. The licensed band: spectrum resources that can only be used after being authorized by the regulatory authorities in the communications industry.
2. Unlicensed frequency bands: the method is that on the premise of meeting the related technical requirements, the spectrum resources can be directly used without the authorization of the management department of the communication industry, and operators can realize the distribution of network capacity by using unlicensed frequency bands to transmit data.
The related technical requirements mainly include two types, the first type of requirements do not relate to specific coexistence specifications, and mainly limit the transmitting power, that is, the transmitting power of the access network device and the transmitting power of the terminal need to be limited in a preset range, so as to avoid interference with communication devices working in adjacent frequency bands and shared frequency bands. The second type of requirements sets a specific coexistence specification for coexistence with other radio services such as radio positioning. The coexistence specifications include at least specifications for transmit power control (Transmit Power Control, TPC), dynamic frequency selection (Dynamic Frequency Selection, DFS), channel occupation bandwidth, listen before talk (Listen Before Talk, LBT), and the like.
3. LBT: for the unlicensed band, before each communication device (network device or terminal) transmits data on a certain channel, it needs to detect whether the current channel is idle, that is, detect whether other communication devices nearby are occupying the channel to transmit data; if the communication device detects that the channel is idle for a period of time, the communication device can transmit data on the current channel, but the communication device has a limit on the length of time for transmitting data, and the communication device does not need to execute the process of detecting whether the current channel is idle again in the limited time range; if it is detected that the channel is occupied, the communication device cannot transmit data on the current channel. The process of detecting whether the current channel is idle is also called idle channel assessment (Clear Channel Assessment, CCA), and the name of the process of detecting whether the current channel is idle is not limited in this embodiment.
4. Spatial filtering parameters: also called spatial domain filter parameters (spatial domain filter parameter), or spatial filter parameters or spatial parameters (spatial parameter), are the manifestation of the beam in the NR protocol.
The beam used for transmitting the signal is a transmission beam (transmission beam, tx beam), which may also be referred to as a spatial domain transmission filter parameter (spatial domain transmission filter parameter) or a spatial transmission parameter (spatial transmission parameter). The beam used to receive the signal is a receive beam (Rx beam), which may also be referred to as a spatial domain receive filter parameter (spatial domain receive filter parameter) or a spatial receive parameter (spatial RX parameter).
In order to improve the throughput of NR systems, it is necessary to use the millimeter wave band to acquire larger bandwidth resources. The attenuation of the millimeter wave frequency channel is very large, and the network equipment and the terminal need to utilize the multi-antenna beam forming technology to beam in a specific direction so as to improve the transmission channel gain and ensure the coverage of signals. The reference signal is beamformed to analog beamforming by a term shifter. Over the entire communication bandwidth, one shifter can only take one value at one time, so analog beamforming techniques require switching different beams through multiple different times. The spatial filtering parameters in the scene may be beamforming vectors, such as vectors in a set of DFT basis.
For convenience of description in the embodiment of the present application, only the beam for transmitting signals will be referred to as a spatial transmission filter parameter, and the beam for receiving signals will be referred to as a spatial reception filter parameter.
The side-link is an important branch in the mobile communication network, and aims to realize direct communication between equipment terminals (D2D) without going through a base station and a core network, thereby reducing communication delay, saving transmission power and relieving transmission pressure of the core network, and the side-link will be widely applied in the fields of internet of vehicles (Vehicle to Everything, V2X), smart home, smart factories and the like in the future. With the advent of new data services such as augmented reality (Augmented reality, AR), virtual reality (Virtual reality), and the like, which have extremely high throughput requirements, side-link systems are required to provide higher data rate transmission services for their users. In addition to the research on various new physical layer technologies, such as multiple input multiple output, non-orthogonal multiple access, etc., a key bottleneck for improving throughput of a communication system is to find new spectrum resources. The unlicensed millimeter wave frequency band is a communication frequency band with a great market prospect in the future, on one hand, the frequency band is higher, the bandwidth resources are rich, and the high-data-rate transmission service can be naturally supported; on the other hand, the unlicensed band is generally used for free, and access to the unlicensed band is not required to be licensed, which is very suitable for network deployment of a side-link system, which does not require infrastructure and has high dynamics.
While the deployment of side-link systems in unlicensed bands generally requires consideration of two issues, the first being the channel access problem and the second being the beam training problem.
Although the unlicensed band is an open band, the unlicensed band must be used to adhere to corresponding rules to ensure that all communication devices that want to use the unlicensed band can access the channel on a fair premise. Wireless communication systems currently active in unlicensed bands are mainly Wi-Fi systems based on the IEEE 802.11 family of standards. To achieve fair coexistence with existing Wi-Fi devices, the side-link devices need to follow listen before talk (Listen before talk, LBT) rules, i.e., the side-link devices need to listen to an unlicensed channel before transmitting the channel, and can occupy the unlicensed channel for data transmission after completing clean channel assessment.
The millimeter wave frequency band has higher frequency and larger channel loss attenuation, and the wave beam is formed in a specific direction by utilizing a multi-antenna framework to improve the channel gain of transmission, so that the signal-to-noise ratio required by normal communication is ensured. In general, the position between the two transmitting and receiving ends and the information such as multipath transmission of the signal in space are unknown, and the reference signal needs to be measured by continuously switching the beam direction to determine the optimal beam direction, namely, the beam training process is completed. Because most of millimeter wave communication systems are based on an analog-digital hybrid antenna architecture at present, the number of beam directions of single scanning is generally very limited, so that the beam training process is very long, and the performances of delay performance, mobility support, effective throughput and the like of side link communication are seriously affected. Therefore, the side link needs to be correspondingly improved aiming at the characteristics of the unlicensed millimeter wave frequency band, so that the time delay of beam training is reduced.
In the related art, the unlicensed band beam training process includes, but is not limited to, the following steps: and the side-link transmitting end equipment selects one beam direction, performs channel interception in the beam direction, transmits a reference signal in the beam direction when no other communication equipment is determined to be transmitting in the beam direction, measures the reference signal RSRP, switches to the other beam direction, repeats the process until the beam direction to be trained is trained, and reports a plurality of reference signal identifiers with the maximum measured RSRP and corresponding RSRP quantized values.
However, in the above method, the beam direction needs to be switched frequently in the beam training process, so that a new directional listen before talk (listen before talk, LBT) process is performed in each beam direction, which introduces a lot of extra delay to the beam training process, and if the channel is occupied by other devices on an unlicensed frequency band in the process of performing LBT, the beam training process will be interrupted.
The embodiment of the application performs joint optimization on the beam training process and the LBT process of the side link by multiplexing the time for executing the LBT and the time for measuring the reference signal, thereby reducing the LBT overhead and the time delay of the beam training.
The technical scheme of the embodiment of the application can be applied to various communication systems, such as: wireless fidelity (wifi), worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, wiMAX), global system for mobile communications (Global System of Mobile communication, GSM), code division multiple access (Code Division Multiple Access, CDMA) systems, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) systems, general packet radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE) systems, long term evolution-advanced (Advanced long term evolution, LTE-a) systems, universal mobile telecommunications systems (Universal Mobile Telecommunication System, UMTS), and third generation partnership project (The 3rd Generation Partnership Project,3GPP) related cellular systems, and The like, as well as fifth generation mobile telecommunications systems (The Fifth Generation, 5G). The embodiment of the application is mainly applied to a 5G side uplink system or a 5G evolution side uplink system. The embodiments of the present application are not limited.
The technical scheme of the embodiment of the application can be applied to various possible service scenes, such as: internet of vehicles (Vehicle to Everything, V2X), smart home, smart factory, etc. The embodiments of the present application are not limited.
The network architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided by the embodiments of the present application, and those skilled in the art can know that, with the evolution of the network architecture and the appearance of the new service scenario, the technical solution provided by the embodiments of the present application is applicable to similar technical problems.
Fig. 1a shows a schematic diagram of a network architecture to which embodiments of the present application may be applied. The network architecture may be that of a C-V2X system. Wherein, C refers to a Cellular (English: cellular), and the C-V2X system is a vehicle-mounted wireless communication system formed by evolution of a Cellular network communication system such as 3G, 4G or 5G. The network architecture may include: core network 11, access network 12, terminal 13, and vehicle 14.
The core network 11 includes a plurality of core network devices. The core network device mainly has the functions of providing user connection, managing users and carrying out service, and is used as an interface for providing a bearing network to an external network. For example, a core network of a long term evolution (Long Term Evolution, LTE) system may include a mobile management node (Mobility Management Entity, MME), a Serving Gateway (S-GW), a PDN Gateway (P-GW), and the like. The core network of the 5G NR system may include an access and mobility management function (Access and Mobility Management Function, AMF) entity, a user plane function (User Plane Function, UPF) entity, a session management function (Session Management Function, SMF) entity, and the like.
Access network 12 includes a number of access network devices 120 therein. Access network device 120 may be a base station and the remainder of access network 12 may include an internet protocol (Internet Protocol, IP) network. The base station may also coordinate attribute management for the air interface. For example, the base station may be a base station (Base Transceiver Station, BTS) in GSM or CDMA, a base station (NodeB) in WCDMA, or an evolved base station (evolutional Node B, eNB or e-NodeB) in LTE; in the 5G NR system, it is called gNodeB or gNB. The embodiment of the present application is not limited thereto.
The terminal 13 may include various handheld devices, vehicle mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, etc. with wireless communication capabilities. For example, the terminal 13 may be a personal communication services (Personal Communication Service, PCS) phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA) or the like. A Terminal may also be referred to as a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile Station), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), a User Equipment (User Device), or a User Equipment (User Equipment). For convenience of description, the above-mentioned devices are collectively referred to as a terminal. Access network device 120 and terminal 13 communicate with each other via some air interface technology, such as the Uu interface.
The vehicle 14 may be an autonomous vehicle or a non-autonomous vehicle. The vehicle 14 is provided with a vehicle-mounted device by which the vehicle 14 communicates with other vehicles, terminals 13 or other devices, such as a Road Side Unit (RSU). The in-vehicle apparatus may also be referred to as an in-vehicle terminal, an in-vehicle communication device, or other names, to which the embodiment of the present application is not limited.
The on-board devices of the vehicle 14 and other devices (e.g., other on-board devices, terminals 13, RSUs, etc.) may communicate with each other via a side-link communication interface (e.g., a PC5 interface), and accordingly, the communication link established based on the side-link communication interface may be referred to as a side-link or a side-link. In addition, the vehicle 14 may also transit with other devices through the access network 12 and the core network 11, that is, communicate with the access network device 120 by using the communication link between the terminal 13 and the access network device in the original cellular network. Compared with Uu interface communication, the side-link communication interface communication has the characteristics of short time delay, low cost and the like, and is suitable for communication between vehicle-mounted equipment and other peripheral equipment with close geographic positions.
The network architecture shown in fig. 1a may implement a V2X service scenario, where the network architecture may further include RSU, a V2X application server, a V2X control function node, and other devices, which is not limited in this embodiment of the present application. In addition, the technical scheme described in the embodiment of the application can be applied to a 5G NR system and also can be applied to a subsequent evolution system of the 5G NR system.
Fig. 1b shows a schematic diagram of another network architecture to which embodiments of the present application may be applied. The network architecture may be a network architecture of an intelligent home system. The intelligent home system is an intelligent home wireless communication system formed based on the evolution of a 3G, 4G or 5G cellular network communication system. The network architecture may include: core network 21, access network 22, terminal 23, and smart home device 24.
The core network 21 includes a plurality of core network devices. Access network 22 includes a number of access network devices 220 therein. Access network device 220 and terminal 23 communicate with each other via some air interface technology, such as the Uu interface. The terminal 23 may include various handheld devices, vehicle mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, etc. with wireless communication capabilities.
It should be noted that, the relevant descriptions of the core network 21, the access network 22, and the terminal 23 may refer to the relevant descriptions in the foregoing embodiments, and will not be repeated here.
The smart home device 24 includes an intelligent device that implements information exchange and even autonomous learning through a wireless communication technology, and the smart home device 24 can provide a convenient and effective service for a user, and reduce the amount of labor of the user. For example, smart home devices may include smart sockets, smart door locks, smart lights, smart fans, smart air conditioners, smart curtains, and the like.
The smart home device 24 and other devices (e.g., other smart home devices 24, terminals 23, RSUs, etc.) may communicate with each other via a side-link communication interface (e.g., a PC5 interface), and accordingly, the communication link established based on the side-link communication interface may be referred to as a direct link or a side-link. In addition, the smart home device 24 and other devices can also transit through the access network 22 and the core network 21, that is, communicate by using the communication link between the terminal 23 and the access network device 220 in the original cellular network. The technical scheme described by the embodiment of the application can be applied to a 5G NR system and also can be applied to a subsequent evolution system of the 5G NR system.
Fig. 2 shows a schematic diagram of another network architecture to which embodiments of the present application may be applied. The network architecture may be a wireless communication system formed based on the evolution of a cellular network communication system such as 3G, 4G, or 5G. The network architecture may include: a first device 32 and a second device 34.
The first device 32 and the second device 34 are two end devices that perform side-link communication in the internet of vehicles, smart home or other business scenarios, and the first device 32 and the second device 34 can establish a side-link through a side-link communication interface (such as a PC5 interface), and then perform interaction of user-plane data and control-plane signaling through the side-link.
For example, the first device 32 may be an on-board device of the vehicle 14 in the network architecture shown in fig. 1a, and the second device 34 may be an on-board device of another vehicle, or may be the terminal 13 or RSU. For another example, the first device 32 may be the smart home device 24 in the network architecture shown in fig. 1b, and the second device 34 may be other smart home devices 24, or may be the terminal 23 or RSU.
In some embodiments, the same device (like a vehicle-mounted device or the same terminal or the same smart home device) may be used as the first device 32 in some scenarios and as the second device 34 in other scenarios.
In the embodiment of the application, a beam training method is provided for the side uplink communication process in the Internet of vehicles, intelligent home or other business scenes so as to solve the problems of LBT overhead and time extension of beam training.
The technical scheme of the application is described and illustrated by several exemplary embodiments.
Fig. 3 is a flow chart illustrating a method of beam training according to an exemplary embodiment. The method can be applied to the network architecture shown in fig. 1a, fig. 1b or fig. 2, and in the embodiment of the present application, the first device is a side-uplink communication receiving end user device, and the second device is a side-uplink communication transmitting end user device. The method may include, but is not limited to, the following steps.
In step 301, the second device determines a first time-frequency resource and a second time-frequency resource, where the time-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are the same and the frequency-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are different.
Optionally, the second device selects the first time-frequency resource and the second time-frequency resource from the preconfigured resource pool.
Optionally, the first time-frequency resource and the second time-frequency resource are determined by the second device according to configuration information of the base station.
In one possible implementation, in a first mode of the side uplink, a second device under the coverage of the base station may send a scheduling request to the base station through a Dynamic grant (Dynamic grant), the base station configures available time-frequency resources to the first device, and the second device determines time-frequency positions of the first time-frequency resource and the second time-frequency resource from the available time-frequency resources.
In another possible implementation, the base station configures available time-frequency resources to the first device through radio resource control (Radio Resource Control, RRC) signaling by means of a configuration grant (configured grant), and the second device determines time-frequency locations of the first time-frequency resource and the second time-frequency resource from the available time-frequency resources.
In another possible implementation, in a second mode of the side-link, the second device autonomously determines available first and second time-frequency resources through a perceptual selection (sensing and selection) mechanism.
The time domain resources corresponding to the first time frequency resource and the second time frequency resource are the same, and the frequency domain resources corresponding to the first time frequency resource and the second time frequency resource are different. The first time-frequency resource is used for transmitting a first reference signal, and the second time-frequency resource indicates a time-frequency position where the first device performs energy detection and/or signal detection, and the energy detection and/or signal detection is used for performing LBT of an unlicensed channel.
Optionally, the first time-frequency resource is a first reference signal time-frequency resource configured for beam training, and the second time-frequency resource is a second reference signal time-frequency resource configured for IM. Optionally, the first reference signal is CSI-RS, and the second reference signal is CSI-IM. The embodiment of the present application is not limited thereto.
Optionally, the unlicensed channel is an unlicensed millimeter wave channel.
Step 302, the second device sends first configuration information, where the first configuration information indicates a first time-frequency resource and a second time-frequency resource.
Optionally, the second device confirms whether other devices are transmitting on the unlicensed channel in a third time unit, and after confirming that no other devices are transmitting, the second device sends the first configuration information to the first device, where the third time unit is a time unit before a target time unit, and the target time unit is a time unit where the first time-frequency resource and the second time-frequency resource are located.
The first configuration information includes a time-frequency location of the first time-frequency resource and a time-frequency location of the second time-frequency resource. The time domain resources corresponding to the first time frequency resources and the second time frequency resources are the same and the frequency domain resources corresponding to the first time frequency resources and the second time frequency resources are different. That is, the time domain resource corresponding to the first time-frequency resource is a target time unit, the time domain resource corresponding to the second time-frequency resource is also a target time unit, and the frequency domain resource corresponding to the first time-frequency resource and the frequency domain resource corresponding to the second time-frequency resource have no intersection.
The target time unit is a time domain resource corresponding to the configured first time-frequency resource and second time-frequency resource. For example, the target time unit is a target symbol. The embodiment of the present application is not limited thereto.
Optionally, the first configuration information is directly configured and activated through RRC signaling, or is activated through RRC signaling after being preconfigured and then through media access control Layer (Media Access Control, MAC) Layer signaling, or is activated through RRC signaling after being preconfigured and then through Physical Layer (PHY) signaling.
Optionally, the time-frequency resources of the unlicensed channel include a first time-frequency resource and a second time-frequency resource. I.e. the first time-frequency resource and the second time-frequency resource are part of the time-frequency resources of the unlicensed channel.
Optionally, the first configuration information includes resource indication information and reporting behavior indication information of the reference signal. The resource indication information of the reference signal includes first indication information and second indication information. The first indication information includes a time-frequency location, a port number, and a Quasi Co-location (QCL) indication of a first time-frequency resource of the first reference signal. The second indication information includes a time-frequency location and a port number of a second time-frequency resource of the second reference signal.
Optionally, the difference between the time domain position of the second time-frequency resource of the second reference signal and the occupation ending time of the current unlicensed channel is smaller than a preset difference threshold, the preset difference threshold is the maximum time difference allowed by the LBT interception result and the channel use time, and the preset difference threshold is determined by the relevant regulations of each region. The embodiment of the present application is not limited thereto.
In an illustrative example, as shown in FIG. 4, the second device configures the first device with the first time-frequency resource of the two-port CSI-RS and the second time-frequency resource of the two-port CSI-IM on the 12 th symbol at the same time, the time-domain position T of the CSI-IM IM0 I.e. "symbol 11", the occupation ending time T of this unauthorized channel E0 I.e. "sign 13", the absolute value of the difference between the two "2 signs" being smaller than the preset difference threshold T LBT0 "4 symbols" so as to satisfy the above-mentioned time difference requirement, so that the subsequent first device can judge whether the unlicensed channel is occupied or not by using the interference measurement result measured on the 12 th symbol, and at T LBT0 And then decides whether to perform subsequent information transmission on the unlicensed channel.
Optionally, the reporting behavior indication information includes a first identifier and/or a second identifier. The first identifier indicates the first device to report the beam measurement result corresponding to at least one first reference signal, and the second identifier indicates whether the first device reports the interference measurement result corresponding to the second time-frequency resource.
Optionally, the first identifier instructs the first device to report an identifier of the at least one first reference signal and a corresponding measurement quantization value. For example, the first reference signal is a CSI-RS, and the corresponding measurement quantized value is a quantized value of an RSRP measurement of the CSI-RS.
Optionally, the corresponding interference measurement result on the second time-frequency resource includes an identification of a corresponding second reference signal on the second time-frequency resource and a corresponding measured interference value. Since one of the purposes of the second time-frequency resources configured by the second device is to enable the first device to make energy measurements and/or signal measurements in advance to perform LBT, the second device may not require the first device to report interference measurements. For example, the second reference signal is CSI-IM.
The second identifier includes a first value or a second value, and when the second identifier is the first value, the first device is instructed to report a corresponding interference measurement result on the second time-frequency resource; and when the second identifier is a second value, indicating that the first equipment does not report the corresponding interference measurement result on the second time-frequency resource, wherein the first value is different from the second value. The embodiment of the present application is not limited thereto.
Alternatively, the first configuration information may be triggered by the side uplink control information (sidelink control information, SCI) after the second device is configured to the first device in advance through RRC signaling.
The second device transmits the first configuration information on an unlicensed channel. Alternatively, to enhance the reliability of the transmission, the unlicensed channel may be a low-band channel; such as an unlicensed channel of 5 GHz.
Correspondingly, the first device receives first configuration information sent by the second device, wherein the first configuration information indicates a first time-frequency resource and a second time-frequency resource, and the time-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are the same and the frequency-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are different.
After receiving the first configuration information, the first device determines resource indication information and reporting behavior indication information of a reference signal in the first configuration information.
In step 303, the second device uses the third spatial transmission filtering parameter to transmit the first reference signal on the configured first time-frequency resource.
The second device selects a transmission beam direction to be trained, namely, determines a third spatial transmission filtering parameter, and then performs a directional LBT procedure by using a fourth spatial reception filtering parameter. The fourth spatial reception filter parameter is a spatial filter parameter associated with the third spatial transmission filter parameter, the association being for ensuring that a beam range transmitted by the second device under the third spatial transmission filter parameter is a subset of a beam range received by the second device under the fourth spatial reception filter parameter.
When it is determined after LBT that no other communication device is transmitting information on the intercepted unlicensed channel, a third spatial transmit filtering parameter is used for transmitting information, where the information may include control information, data, and reference signals. The second device adopts a third spatial transmission filtering parameter to transmit a predefined sequence, namely a first reference signal, on the configured first time-frequency resource, and does not transmit any signal on the configured second time-frequency resource.
In step 304, the first device receives and measures the first reference signal on the first time-frequency resource using the first spatial reception filtering parameter in the target time unit, and performs energy detection and/or signal detection on the second time-frequency resource using the first spatial reception filtering parameter, where the energy detection and/or signal detection is used to perform LBT of the unlicensed channel.
The target time unit is a time unit where the first time-frequency resource and the second time-frequency resource are located.
The first device receives and measures a first reference signal on a first time-frequency resource using a first spatial reception filtering parameter in a target time unit, and performs energy detection and/or signal detection on a second time-frequency resource using the first spatial reception filtering parameter in the target time unit.
In one possible implementation, the first device selects a receiving beam direction, that is, determines a first spatial receiving filter parameter, and uses the first spatial receiving filter parameter to receive control information, data, and a reference signal sent by the second device. The first device receives and measures a first reference signal and a second reference signal on a first time-frequency resource in a target time unit by adopting a first space receiving filtering parameter.
Optionally, the first device determines the first spatial reception filtering parameter according to QCL indication of the first reference signal and/or historical measurement information of the first reference signal in the first configuration information. Alternatively, the first device randomly selects one beam direction as the reception beam direction, i.e. determines the first spatial reception filtering parameter. Wherein the first spatial receive filter parameter is used to determine a receive beam direction of the first device.
Optionally, the first device performs energy detection and/or signal detection on the second time-frequency resource, including: the first device performs energy detection on the second time-frequency resource, wherein the energy detection is used for performing LBT of an unauthorized channel; or the first device performs signal detection on the second time-frequency resource, wherein the signal detection is used for executing LBT of an unauthorized channel; alternatively, the first device performs energy detection and signal detection on the second time-frequency resource, the energy detection and signal detection being used to perform LBT of the unlicensed channel.
Illustratively, the first device performs energy detection and/or signal detection on the second time-frequency resource, including: the first device performs RSRP measurements on the second time-frequency resources.
Optionally, after the first device receives and measures the first reference signal on the first time-frequency resource by using the first spatial receiving filter parameter in the target time unit, the beam measurement result corresponding to at least one first reference signal is reported to the second device. Wherein the beam measurement results corresponding to the at least one first reference signal include an identification of the at least one first reference signal and the corresponding measurement results.
Optionally, after performing energy detection and/or signal detection on the second time-frequency resource, the first device reports or does not report a corresponding interference measurement result on the second time-frequency resource. The interference measurement result corresponding to the second time-frequency resource comprises the identification of the second reference signal corresponding to the second time-frequency resource and the corresponding interference measurement value.
In an illustrative example, the first reference signal is a CSI-RS, the second reference signal is a CSI-IM, and after the first device performs RSRP measurement on the first time-frequency resource, i.e., the CSI-RS position, and the second time-frequency resource, i.e., the CSI-IM position, the first device reports the identifier of at least one CSI-RS and the quantization value of the corresponding RSRP measurement result to the second device. If the second device indicates the first device to report the CSI-IM measurement result through the first configuration information, the first device reports the identifier of at least one CSI-IM and the quantization value of the corresponding interference measurement result to the second device.
In step 305, after the LBT detection is successful, the first device uses the second spatial transmit filter parameter to transmit the third reference signal or data in the second time unit.
Optionally, the first device performs interference measurement on the second time-frequency resource by using the first spatial receiving filtering parameter to obtain a first power measurement value, and converts the first power measurement value into a second power measurement value of an unlicensed channel, so as to determine a magnitude relation between the second power measurement value and a power measurement threshold value. When the second power measurement value is less than the power measurement threshold value, the first device transmits information on an unlicensed channel.
Optionally, the second power measurement value is a power measurement value corresponding to the whole channel of the converted unlicensed channel, and when the second power measurement value is smaller than the power measurement threshold value, the first device adopts the second spatial transmission filtering parameter on the unlicensed channel to perform information transmission.
Optionally, the first device applies the first power measurement P by the following formula CSI-IM Second power measurement P converted into unlicensed channel LBT ：P LBT ＝P CSI-IM +10log 10 (M LBT /M CSI-IM )。
Wherein M is LBT Measurement bandwidth defined for LBT (e.g. 20MHz for one unlicensed channel), M CSI-IM The measurement bandwidth for CSI-IM.
The first device judges the magnitude relation between the second power measurement value and the power measurement threshold value, and determines whether an unauthorized channel is idle, namely whether LBT detection is successful. And when the second power measurement value is smaller than the power measurement threshold value, the unlicensed channel is idle, that is, no other equipment on the unlicensed channel is confirmed to be transmitting information, and the first equipment can transmit information on the unlicensed channel. When the second power measurement value is greater than or equal to the power measurement threshold value, the unlicensed channel is not idle, that is, it is confirmed that other devices exist on the unlicensed channel and information transmission cannot be performed on the unlicensed channel, and the first device initiates a new LBT procedure or performs other operations.
Optionally, when the second power measurement value is smaller than the power measurement threshold value, the first device transmits the third reference signal or data using the second spatial transmission filtering parameter in the second time unit. Correspondingly, the second device receives a third reference signal or data in the second time unit. After the first device determines that the second power measurement value is smaller than the power measurement threshold value, the first device is used as a side uplink transmitting end device in a second time unit, and a second space transmission filtering parameter is adopted to transmit a third reference signal or data. Optionally, the first device uses the second spatial transmission filtering parameter to transmit a third reference signal or data to the second device or a third device, where the third device is other than the second device. The embodiment of the present application is not limited thereto. For convenience of description, only the case where the first device transmits the third reference signal or data to the second device using the second spatial transmission filtering parameter will be described.
The second time unit is a time unit after the target time unit, the target time unit is a time unit in which the first time-frequency resource and the second time-frequency resource are located, and the second spatial transmission filtering parameter is a spatial transmission filtering parameter corresponding to the first spatial reception filtering parameter.
Optionally, the second time unit is a kth time unit after the target time unit, and k is a positive integer. For example, k may be 1. The embodiment of the present application is not limited thereto.
Wherein the second time unit is also referred to as a time unit after the first reference signal. Optionally, the second spatial transmission filter parameter is a spatial filter parameter associated with the first spatial reception filter parameter, and the association is used to ensure that a beam range transmitted by the first device under the second spatial transmission filter parameter is a subset of a beam range received by the first device under the first spatial reception filter parameter.
Optionally, in a time unit after the target time unit, the first device becomes a side-uplink transmitting end device, the second device becomes a side-uplink receiving end device, and when the first device needs to transmit a third reference signal for beam training in the second time unit by adopting the second spatial transmission filtering parameter, available third time-frequency resources and fourth time-frequency resources are determined. The first device sends second configuration information, the second configuration information indicates a third time-frequency resource and a fourth time-frequency resource, the time-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are the same and the frequency-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are different, the third time-frequency resource is used for sending a third reference signal, and the fourth time-frequency resource indicates a time-frequency position for energy detection and/or signal detection. Correspondingly, the second device receives the second configuration information. The second device receives and measures a third reference signal on a third time-frequency resource using a fifth spatial reception filtering parameter in the second time unit, and performs energy detection and/or signal detection on a fourth time-frequency resource, the energy detection and/or signal detection being used to perform LBT of an unlicensed channel.
Optionally, the first device transmits the second configuration information before transmitting the third reference signal or data.
Optionally, after receiving the second configuration information, the second device receives and measures the third reference signal on the third time-frequency resource by using the fifth spatial reception filtering parameter, and performs energy detection and/or signal detection on the fourth time-frequency resource, where the energy detection and/or signal detection is used to perform LBT of the unlicensed channel.
Optionally, the third time-frequency resource is a third reference signal time-frequency resource configured for beam training, and the fourth time-frequency resource is a fourth reference signal time-frequency resource configured for IM.
It should be noted that, the description of the second configuration information may be analogically referred to the description of the first configuration information, which is not described herein.
In an illustrative example, the third reference signal is CSI-RS and the fourth reference signal is CSI-IM, as shown in fig. 5, the first device configures the third time-frequency resource of the two-port CSI-RS and the fourth time-frequency resource of the two-port CSI-IM on the 13 th symbol for the second device at the same time, and the time-domain position T of the CSI-IM IM1 I.e. "symbol 12", the occupation ending time T of this unauthorized channel E1 I.e. "sign 13", the absolute value of the difference between the two "1 sign" being smaller than the preset difference threshold T LBT1 "4 symbols" so that the time difference requirement is met so that a subsequent second device can determine whether the unlicensed channel is occupied by the interference measurement measured on the 13 th symbol, and at T LBT1 And then decides whether to perform subsequent information transmission on the unlicensed channel.
It should be noted that, the first device may be used as a side uplink transmitting end device, and the details related to the second device for transmitting the second configuration information may refer to the second device as a side uplink transmitting end device, and the descriptions related to the first configuration information transmitted to the first device are not described herein; in addition, the second device serves as a side uplink receiving end device, and the details related to performing beam training and performing LBT after receiving the second configuration information may be referred to the first device as a side uplink receiving end device, and details related to performing beam training and performing LBT after receiving the first configuration information are not described herein.
In an illustrative example, as shown in fig. 6, the first device U1 receives and measures CSI-RS transmitted by the second device U2 using a first spatial reception filtering parameter at the end of a first time slot, performs LBT through CSI-IM configured by the second device U2 at the end of the time slot, and after the LBT detection is successful, transmits a new CSI-RS for beam training and CSI-IM for performing LBT to the second device U2 using a second spatial transmission filtering parameter corresponding to the first spatial reception filtering parameter.
The first device and the second device may continuously switch the transceiving state. The embodiment of the present application is not limited thereto. And new LBT overhead is not required to be introduced in the switching process, so that the time for beam training is saved, and the beam reliability is improved.
In summary, the embodiment of the present application provides a new joint configuration method of reference signal time-frequency resources for beam measurement and reference signal time-frequency resources for interference measurement, and a new LBT mechanism, so that a side-link receiving end device performs LBT while receiving beam training, reduces time overhead of LBT, and improves success rate of LBT, thereby shortening flow of beam training.
Fig. 7 is a flow chart illustrating a method of beam training according to an exemplary embodiment. The method can be applied to the network architecture shown in fig. 1a or fig. 1b or fig. 2. The method may comprise the following steps.
In step 701, the second device sends first configuration information, where the first configuration information indicates a first time-frequency resource and a second time-frequency resource, where time-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are the same and frequency-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are different.
The time unit where the first time frequency resource and the second time frequency resource are located is a target time unit.
The first time-frequency resource is used for transmitting a first reference signal, the second time-frequency resource indicates a time-frequency position for performing energy detection and/or signal detection, and the energy detection and/or signal detection is used for performing Listen Before Talk (LBT) of an unauthorized channel.
In step 702, a first device receives first configuration information, the first configuration information indicating a first time-frequency resource and a second time-frequency resource.
The time domain resources corresponding to the first time frequency resource and the second time frequency resource are the same, and the frequency domain resources corresponding to the first time frequency resource and the second time frequency resource are different.
In step 703, the first device receives and measures the first reference signal on the first time-frequency resource using the first spatial reception filtering parameter in the target time unit, and performs energy detection and/or signal detection on the second time-frequency resource using the first spatial reception filtering parameter, where the energy detection and/or signal detection is used to perform LBT of the unlicensed channel, and the target time unit is a time unit where the first time-frequency resource and the second time-frequency resource are located.
It should be noted that, for details of each step in this embodiment, reference may be made to the description of the foregoing embodiments, which is not repeated herein.
In summary, after the first configuration information indicating the first time-frequency resource and the second time-frequency resource, which is sent by the second device, is received by the first device, the first reference signal is received and measured on the first time-frequency resource by using the first spatial reception filtering parameter in the target time unit, and the energy detection and/or the signal detection are performed on the second time-frequency resource by using the first spatial reception filtering parameter, that is, the time for executing the LBT and the time for measuring the first reference signal are multiplexed, so that the LBT overhead is saved, the time delay of the beam training process is reduced, and the probability of being interrupted by other devices on the unlicensed frequency band is reduced.
Referring to fig. 8, a block diagram of a beam training apparatus according to an exemplary embodiment of the present application is shown. The beam training apparatus may be implemented as all or part of the first device by software, hardware or a combination of both. The beam training apparatus may include: a receiving unit 810 and a processing unit 820.
A receiving unit 810, configured to receive first configuration information, where the first configuration information indicates a first time-frequency resource and a second time-frequency resource, and the time-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are the same and the frequency-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are different;
a processing unit 820, configured to receive and measure a first reference signal on a first time-frequency resource using a first spatial reception filtering parameter in a target time unit, and perform energy detection and/or signal detection on a second time-frequency resource using the first spatial reception filtering parameter, where the energy detection and/or signal detection is used to perform LBT of an unlicensed channel; the target time unit is a time unit where the first time-frequency resource and the second time-frequency resource are located.
In one possible implementation, the first time-frequency resource is a configured first reference signal time-frequency resource for beam training, and the second time-frequency resource is a configured second reference signal time-frequency resource for IM.
In another possible implementation manner, the first configuration information further includes a first identifier and/or a second identifier, where the first identifier indicates that the first device reports a beam measurement result corresponding to at least one first reference signal, and the second identifier indicates whether the first device reports an interference measurement result corresponding to the second time-frequency resource.
In another possible implementation, the time-frequency resources of the unlicensed channel include a first time-frequency resource and a second time-frequency resource, and the processing unit 820 is further configured to:
carrying out interference measurement on a second time-frequency resource by adopting a first space receiving filter parameter to obtain a first power measurement value;
converting the first power measurement to a second power measurement of the unlicensed channel;
and when the second power measurement value is smaller than the power measurement threshold value, information transmission is carried out on the unauthorized channel.
In another possible implementation manner, the apparatus further includes a transmitting unit, where the transmitting unit is configured to transmit the third reference signal or the data using the second spatial transmission filtering parameter in a second time unit when the second power measurement value is less than the power measurement threshold value;
the second time unit is a time unit after the target time unit, and the second spatial transmission filtering parameter is a spatial transmission filtering parameter corresponding to the first spatial reception filtering parameter.
In another possible implementation manner, the apparatus further includes a transmitting unit, where the transmitting unit is configured to transmit second configuration information, where the second configuration information indicates a third time-frequency resource and a fourth time-frequency resource, where time-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are the same and frequency-domain resources corresponding to the fourth time-frequency resource are different, where the third time-frequency resource is used to transmit a third reference signal, and where the fourth time-frequency resource indicates a time-frequency location where energy detection and/or signal detection is performed.
It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the respective units is used as an example, in practical application, the foregoing functional allocation may be implemented by different units according to actual needs, that is, the content structure of the device is divided into different units, so as to implement all or part of the functions described above.
The specific manner in which the respective units perform the operations in the apparatus of the above embodiment has been described in detail in relation to the embodiment of the method, and the related details may be combined with the embodiment of the method described with reference to fig. 3 to 7, which will not be described in detail here.
Referring to fig. 9, a block diagram of a beam training apparatus according to another exemplary embodiment of the present application is shown. The beam training apparatus may be implemented as all or part of the second device by software, hardware or a combination of both. The beam training apparatus may include: a transmitting unit 910.
A transmitting unit 910, configured to transmit first configuration information, where the first configuration information indicates a first time-frequency resource and a second time-frequency resource, the time-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are the same and the frequency-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are different, and a time unit where the first time-frequency resource and the second time-frequency resource are located is a target time unit;
the first time-frequency resource is used for transmitting a first reference signal, the second time-frequency resource indicates a time-frequency position for performing energy detection and/or signal detection, and the energy detection and/or signal detection is used for performing LBT of an unauthorized channel.
In one possible implementation, the first time-frequency resource is a configured first reference signal time-frequency resource for beam training, and the second time-frequency resource is a configured second reference signal time-frequency resource for IM.
In another possible implementation manner, the first configuration information further includes a first identifier and/or a second identifier, where the first identifier indicates that the first device reports a beam measurement result corresponding to at least one first reference signal, and the second identifier indicates whether the first device reports an interference measurement result corresponding to the second time-frequency resource.
In another possible implementation, the time-frequency resources of the unlicensed channel include a first time-frequency resource and a second time-frequency resource.
In another possible implementation manner, the apparatus further includes a receiving unit, where the receiving unit is configured to receive the third reference signal or the data in a second time unit, and the second time unit is a time unit after the target time unit, and the target time unit is a time unit in which the first time-frequency resource and the second time-frequency resource are located.
In another possible implementation manner, the apparatus further includes a receiving unit, where the receiving unit is configured to receive second configuration information, where the second configuration information indicates a third time-frequency resource and a fourth time-frequency resource, where time-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are the same and frequency-domain resources corresponding to the fourth time-frequency resource are different, where the third time-frequency resource is used to send a third reference signal, and where the fourth time-frequency resource indicates a time-frequency location where energy detection and/or signal detection is performed.
It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the respective units is used as an example, in practical application, the foregoing functional allocation may be implemented by different units according to actual needs, that is, the content structure of the device is divided into different units, so as to implement all or part of the functions described above.
The specific manner in which the respective units perform the operations in the apparatus of the above embodiment has been described in detail in relation to the embodiment of the method, and the related details may be combined with the embodiment of the method described with reference to fig. 3 to 7, which will not be described in detail here.
Referring to fig. 10, a schematic structural diagram of a side-link communication ue according to an exemplary embodiment of the present application is shown, where the side-link communication ue may be the first device or the second device. The side-uplink communication user equipment includes: a processor 101, a receiver 102, a transmitter 103, a memory 104, and a bus 105.
The processor 101 includes one or more processing cores, and the processor 101 executes various functional applications and information processing by running software programs and modules.
The receiver 102 and the transmitter 103 may be implemented as one communication component, which may be a communication chip, and the communication chip may include a receiving module, a transmitting module, a modem module, etc. for modulating and/or demodulating information and receiving or transmitting the information through a wireless signal.
The memory 104 is connected to the processor 101 via a bus 105. The memory 104 stores program instructions and data necessary for the side-link communication user equipment.
The processor 101 is configured to execute program instructions and data in the memory 104 to perform the functions of the various steps performed by the sidelink communication user equipment in the various method embodiments of the present application.
The processor 101 controls the receiver 102 to implement the receiving function of the called side uplink communication user equipment side in the above steps by executing at least one program instruction in the memory 104; the processor 101 controls the transmitter 103 to implement the transmission function of the called-side uplink communication user equipment side in the above-described respective steps by executing at least one program instruction in the memory 104.
Furthermore, the memory 104 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
It will be appreciated that figure 10 shows only a simplified design of a side-uplink communications user equipment. In other embodiments, the sidelink communication user equipment may comprise any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all sidelink communication user equipment in which the present application may be implemented are within the scope of the present application.
An embodiment of the present application provides a beam training apparatus, including: a processor and a memory for storing processor-executable instructions; wherein the processor is configured to implement the above-described method performed by the first device or the second device when executing the instructions.
Embodiments of the present application provide a computer program product comprising a computer readable code, or a non-transitory computer readable storage medium carrying computer readable code, which when run in a processor of an electronic device, performs the above-described method performed by the first device or the second device.
An embodiment of the present application provides a beam training system, which includes a first device including a beam training apparatus as shown in fig. 8, and a second device including a beam training apparatus as shown in fig. 9.
Embodiments of the present application provide a non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the above-described method performed by a first device or a second device.
The computer readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: portable computer disk, hard disk, random Access Memory (Random Access Memory, RAM), read Only Memory (ROM), erasable programmable Read Only Memory (Electrically Programmable Read-Only-Memory, EPROM or flash Memory), static Random Access Memory (SRAM), portable compact disk Read Only Memory (Compact Disc Read-Only Memory, CD-ROM), digital versatile disk (Digital Video Disc, DVD), memory stick, floppy disk, mechanical coding devices, punch cards or in-groove protrusion structures having instructions stored thereon, and any suitable combination of the foregoing.
The computer readable program instructions or code described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in the respective computing/processing device.
Computer program instructions for carrying out operations of the present application may be assembly instructions, instruction set architecture (Instruction Set Architecture, ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, c++ or the like and conventional procedural programming languages, such as the "C" language or similar programming languages. The computer readable program instructions may be executed entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a local area network (Local Area Network, LAN) or a wide area network (Wide Area Network, WAN), or it may be connected to an external computer (e.g., through the internet using an internet service provider). In some embodiments, aspects of the present application are implemented by personalizing electronic circuitry, such as programmable logic circuitry, field programmable gate arrays (Field-Programmable Gate Array, FPGA), or programmable logic arrays (Programmable Logic Array, PLA), with state information for computer readable program instructions.
Various aspects of the present application are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer readable program instructions may also be stored in a computer readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer readable medium having the instructions stored therein includes an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by hardware (e.g., circuits or ASICs (Application Specific Integrated Circuit, application specific integrated circuits)) which perform the corresponding functions or acts, or combinations of hardware and software, such as firmware, etc.
Although the application is described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (16)
1. A method of beam training, the method comprising:
the method comprises the steps that first equipment receives first configuration information, wherein the first configuration information indicates first time-frequency resources and second time-frequency resources, the time-domain resources corresponding to the first time-frequency resources and the second time-frequency resources are the same, and the frequency-domain resources corresponding to the first time-frequency resources and the second time-frequency resources are different;
the first device receives and measures a first reference signal on the first time-frequency resource by adopting a first space receiving filtering parameter in a target time unit, and performs energy detection and/or signal detection on the second time-frequency resource by adopting the first space receiving filtering parameter, wherein the energy detection and/or the signal detection is used for executing Listen Before Talk (LBT) of an unauthorized channel; the target time unit is a time unit where the first time-frequency resource and the second time-frequency resource are located.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the first time-frequency resource is a configured first reference signal time-frequency resource used for beam training, and the second time-frequency resource is a configured second reference signal time-frequency resource used for interference measurement IM.
3. The method according to claim 2, wherein the first configuration information comprises a first identifier and/or a second identifier, the first identifier indicating whether the first device reports the beam measurement result corresponding to the at least one first reference signal, and the second identifier indicating whether the first device reports the interference measurement result corresponding to the second time-frequency resource.
4. A method according to any one of claims 1 to 3, wherein the time-frequency resources of the unlicensed channel comprise the first time-frequency resources and the second time-frequency resources; the performing energy detection and/or signal detection on the second time-frequency resource by adopting the first spatial receiving filtering parameter includes:
performing interference measurement on the second time-frequency resource by adopting the first space receiving filter parameter to obtain a first power measurement value;
converting the first power measurement to a second power measurement of the unlicensed channel;
the method further comprises the steps of:
and when the second power measurement value is smaller than a power measurement threshold value, the first device transmits information on the unlicensed channel.
5. The method of claim 4, wherein said transmitting information by said first device over said unlicensed channel when said second power measurement value is less than a power measurement threshold value comprises:
when the second power measurement value is smaller than the power measurement threshold value, the first device adopts a second space to transmit a third reference signal or data in a second time unit;
The second time unit is a time unit after the target time unit, and the second spatial transmission filtering parameter is a spatial transmission filtering parameter corresponding to the first spatial reception filtering parameter.
6. The method according to claim 4 or 5, characterized in that the method further comprises:
the first device sends second configuration information, the second configuration information indicates a third time-frequency resource and a fourth time-frequency resource, the time-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are the same and the frequency-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are different, the third time-frequency resource is used for sending a third reference signal, and the fourth time-frequency resource indicates a time-frequency position for energy detection and/or signal detection.
7. A method of beam training, the method comprising:
the second equipment sends first configuration information, wherein the first configuration information indicates a first time-frequency resource and a second time-frequency resource, the time-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are the same, and the frequency-domain resources corresponding to the first time-frequency resource and the second time-frequency resource are different;
the first time-frequency resource is used for transmitting a first reference signal, and the second time-frequency resource indicates a time-frequency position for performing energy detection and/or signal detection, wherein the energy detection and/or the signal detection is used for performing Listen Before Talk (LBT) of an unlicensed channel.
8. The method of claim 7, wherein the step of determining the position of the probe is performed,
the first time-frequency resource is a configured first reference signal time-frequency resource used for beam training, and the second time-frequency resource is a configured second reference signal time-frequency resource used for interference measurement IM.
9. The method of claim 8, wherein the first configuration information further comprises a first identifier and/or a second identifier, the first identifier indicating that the first device reports beam measurement results corresponding to at least one first reference signal, and the second identifier indicating whether the first device reports interference measurement results corresponding to the second time-frequency resource.
10. The method according to any of claims 7 to 9, wherein the time-frequency resources of the unlicensed channel comprise the first time-frequency resources and the second time-frequency resources.
11. The method according to any one of claims 7 to 9, further comprising:
the second device receives a third reference signal or data in a second time unit, wherein the second time unit is a time unit after a target time unit, and the target time unit is a time unit in which the first time-frequency resource and the second time-frequency resource are located.
12. The method according to any one of claims 7 to 9, further comprising:
the second device receives second configuration information, wherein the second configuration information indicates a third time-frequency resource and a fourth time-frequency resource, the time-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are the same and the frequency-domain resources corresponding to the third time-frequency resource and the fourth time-frequency resource are different, the third time-frequency resource is used for sending a third reference signal, and the fourth time-frequency resource indicates a time-frequency position for energy detection and/or signal detection.
13. A beam training apparatus, the apparatus comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to implement the method of any of claims 1-6 when executing the instructions.
14. A beam training apparatus, the apparatus comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to implement the method of any of claims 7-12 when executing the instructions.
15. A non-transitory computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the method of any of claims 1-6.
16. A non-transitory computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the method of any of claims 7-12.
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| WO2022089642A1 (en) | 2022-05-05 |
| CN114449539A (en) | 2022-05-06 |
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