CN116321178A

CN116321178A - Determination method and device for idle channel evaluation threshold

Info

Publication number: CN116321178A
Application number: CN202111560077.0A
Authority: CN
Inventors: 乔梁; 余官定; 刘瑞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2023-06-23
Also published as: WO2023116553A1

Abstract

The embodiment of the application relates to a method and a device for determining an idle channel assessment threshold. In the method, a first node obtains a power range of a self-interference signal, and determines a second clear channel assessment threshold according to the power range of the self-interference signal and the first clear channel assessment threshold. When the first node works in the full duplex mode of the unlicensed frequency band, interference generated by the first node can influence the detection result of idle channel assessment, and the detection precision of the idle channel assessment is reduced. In the method provided by the application, the first node adaptively adjusts the idle channel assessment threshold according to the power range of the self-interference signal, so that the influence of the self-interference on the detection result of the idle channel assessment can be weakened, and the detection accuracy of the idle channel assessment is improved.

Description

Determination method and device for idle channel evaluation threshold

Technical Field

The present disclosure relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for determining an idle channel evaluation threshold.

Background

Introducing wireless access and backhaul (integrated access and backhaul, IAB) techniques in a communication system may further improve communication system performance, but may squeeze spectrum resources of an access link if the backhaul link occupies excessive spectrum resources. Thus, the system capacity can be increased by full duplex technology.

The IAB node listens to the channel using a listen before talk (listen before talk, LBT) mechanism and detects whether the channel is clear using a clear channel assessment (clear channel assessment, CCA) detection scheme. If the channel is detected to be idle, the IAB node transmits data on the access link. And the IAB node based on the unlicensed frequency band works in a full duplex mode, and self-interference can be generated. The self-interference of the IAB node may have an influence on the CCA detection process, reducing CCA detection accuracy.

Disclosure of Invention

The application provides a method and a device for determining a clear channel assessment threshold value, which are used for improving the detection precision of clear channel assessment.

In a first aspect, a method for determining a clear channel assessment threshold is provided, including the following steps: the first node obtains the power range of the self-interference signal, and determines a second idle channel assessment threshold according to the power range of the self-interference signal and the first idle channel assessment threshold.

When the first node works in the full duplex mode of the unlicensed frequency band, interference (namely self-interference) generated by the first node can influence the detection result of idle channel assessment, and the detection precision of the idle channel assessment is reduced. Therefore, in the method provided by the application, the first node adaptively adjusts the idle channel assessment threshold according to the power range of the self-interference signal, so that the influence of the self-interference on the detection result of the idle channel assessment can be weakened, and the detection accuracy of the idle channel assessment is improved.

The first clear channel assessment threshold may be a set clear channel assessment threshold, e.g. a maximum value of the set clear channel assessment threshold. The first node may determine to employ a clear channel assessment policy and/or determine whether to perform self-interference cancellation based on a comparison of the power range of the self-interference signal and a magnitude of the first clear channel assessment threshold.

The second clear channel assessment threshold may be a second clear channel assessment threshold employed for the present data transmission, that is, if a channel clear is detected according to the second clear channel assessment threshold, the present data transmission may be performed.

Optionally, before each data transmission, the first node redetermines the second clear channel assessment threshold to ensure that each data transmission is performed under the new clear channel assessment result, thereby improving the transmission performance of the communication system.

In one possible implementation, when the first node determines the second clear channel assessment threshold according to the power range of the self-interference signal and the first clear channel assessment threshold, it may determine whether to perform self-interference cancellation and determine the second clear channel assessment threshold according to the power range of the self-interference signal and the first clear channel assessment threshold.

In this implementation, the first node may determine, according to the power range of the self-interference signal and the first clear channel assessment threshold, the magnitude of self-interference, that is, the magnitude of the influence of self-interference on the detection result of the clear channel assessment, to determine whether to perform self-interference cancellation. And the first node may also determine what clear channel assessment policy to employ to determine the second clear channel assessment threshold.

In one possible implementation, when the first node determines whether to perform self-interference cancellation and determines the second clear channel assessment threshold based on the power range of the self-interference signal and the first clear channel assessment threshold, the first node determines not to perform self-interference cancellation if the maximum value of the power range of the self-interference signal is less than (or less than or equal to) the first clear channel assessment threshold, and determines the second clear channel assessment threshold based on the first clear channel assessment policy.

If the maximum value of the power range of the self-interference signal is smaller (or smaller or equal) than the first clear channel assessment threshold, the self-interference can be considered smaller, and the influence on the detection result of the clear channel assessment is smaller, so that the self-interference cancellation may not be performed.

In one possible implementation, when determining the second clear channel assessment threshold according to the first clear channel assessment policy, the first node may determine the second clear channel assessment threshold according to a maximum value of a power range of the self-interference signal.

For example, the first node may select a value slightly greater than the maximum value of the power range of the self-interference signal (e.g., add a set value to the maximum value of the power range of the self-interference signal) as the second clear channel assessment threshold.

In one possible implementation, when the first node determines whether to perform self-interference cancellation and determines the second clear channel assessment threshold according to the power range of the self-interference signal and the first clear channel assessment threshold, the first node determines to perform self-interference cancellation if the minimum value of the power range of the self-interference signal is greater than (or greater than or equal to) the first clear channel assessment threshold, and determines the second clear channel assessment threshold according to the second clear channel assessment policy.

If the minimum value of the power range of the self-interference signal is greater than (or greater than or equal to) the first clear channel assessment threshold, the self-interference can be considered to be greater, and the influence on the detection result of the clear channel assessment is also greater, so that self-interference cancellation can be performed.

In one possible implementation, when determining the second clear channel assessment threshold according to the second clear channel assessment policy, the first node may perform self-interference cancellation, and perform clear channel assessment detection according to the self-interference cancelled power (i.e. the power of the environmental interference) and the clear channel assessment initial value.

If the channel is detected to be idle, the first node transmits data and tries to receive an acknowledgement of the data; when receiving an acknowledgement of the data, the first node determines the second clear channel assessment threshold as equal to the clear channel assessment initial value; when an acknowledgement of the data is not received, the first node determines a second clear channel assessment threshold, which is less than the clear channel assessment initial value.

When the channel is idle and an acknowledgement of data can be received, the current idle channel assessment initial value is considered to be available, so the idle channel assessment initial value can be kept unchanged. When the channel is idle and no acknowledgement of the data is received, the first node may reduce the idle channel assessment initial value to obtain a second idle channel assessment threshold.

If no channel idle is detected and the clear channel assessment initial value is not equal to the first clear channel assessment threshold (when the clear channel assessment initial value is less than the first clear channel assessment threshold), the first node increases the clear channel assessment initial value and re-executes the second clear channel assessment policy.

When the idle channel is not detected, the current idle channel assessment initial value is considered to be stricter, and the first node can increase the idle channel assessment initial value.

In one possible implementation, when the first node determines whether to perform self-interference cancellation and determine the second clear channel assessment threshold according to the power range of the self-interference signal and the first clear channel assessment threshold, the first node determines the second clear channel assessment threshold according to the third clear channel assessment policy when the minimum value of the power range of the self-interference signal is greater than the first clear channel assessment threshold and the maximum value of the power range of the self-interference signal is greater than the first clear channel assessment threshold.

If the minimum value of the power range of the self-interference signal is greater than the first idle channel assessment threshold value and the maximum value of the power range of the self-interference signal is greater than the first idle channel assessment threshold value, the self-interference can be considered to be large or small, and the influence on the detection result of the idle channel assessment is uncertain, so that the self-interference elimination can be omitted in the third idle channel assessment strategy, and the processing complexity of the first node is reduced.

In one possible implementation, when determining the second clear channel assessment threshold according to the third clear channel assessment policy, the first node performs clear channel assessment detection according to the clear channel assessment initial value.

If no channel idle is detected and the idle channel assessment initial value is equal to the first idle channel assessment threshold, the first node performs a second idle channel assessment policy.

If no channel idle is detected and the clear channel assessment initial value is not equal to the first clear channel assessment threshold, the first node increases the clear channel assessment initial value and re-executes the third clear channel assessment policy.

When no channel idle is detected and the idle channel assessment initial value is equal to the first idle channel assessment threshold, the self-interference can be considered to be larger, and at the moment, the first node executes a second idle channel assessment strategy and performs self-interference elimination. When no idle channel is detected and the idle channel assessment initial value is not equal to the first idle channel assessment threshold, the current idle channel assessment initial value can be considered to be stricter, the first node can increase the idle channel assessment initial value, and the third idle channel assessment strategy is re-executed, so that the second idle channel assessment threshold is adjusted.

In this implementation, the detection accuracy of the clear channel assessment may be improved, and the complexity of node processing may also be reduced.

In a second aspect, embodiments of the present application provide a determining apparatus for a clear channel assessment threshold, where the apparatus may have a function in implementing the first aspect or any one of the possible implementations of the first aspect. The function of the above-mentioned determination device of the clear channel assessment threshold may be implemented by hardware, or may be implemented by executing corresponding software by hardware, where the hardware or software includes one or more modules corresponding to the above-mentioned function. The apparatus may include: an acquisition unit and a determination unit.

The acquisition unit is used for acquiring the power range of the self-interference signal;

and the determining unit is used for determining a second idle channel assessment threshold according to the power range of the self-interference signal and the first idle channel assessment threshold.

In a possible implementation, the determining unit is specifically configured to determine whether to perform self-interference cancellation according to the power range of the self-interference signal and the first clear channel assessment threshold, and determine the second clear channel assessment threshold.

In a possible implementation, the determining unit is specifically configured to determine that no self-interference cancellation is performed and determine a second clear channel assessment threshold according to the first clear channel assessment policy, in a case where a maximum value of a power range of the self-interference signal is smaller than the first clear channel assessment threshold; under the condition that the minimum value of the power range of the self-interference signal is larger than the first idle channel assessment threshold value, determining to perform self-interference elimination, and determining a second idle channel assessment threshold value according to a second idle channel assessment strategy; and determining a second idle channel assessment threshold according to a third idle channel assessment policy under the condition that the minimum value of the power range of the self-interference signal is smaller than the first idle channel assessment threshold and the maximum value of the power range of the self-interference signal is larger than the first idle channel assessment threshold.

In a possible implementation, the determining unit is specifically configured to determine the second clear channel assessment threshold according to a maximum value of the power range of the self-interference signal.

In a possible implementation, the determining unit is specifically configured to transmit data and attempt to receive an acknowledgement of the data if the channel is detected to be idle; when receiving the acknowledgement of the data, determining a second clear channel assessment threshold value to be equal to a clear channel assessment initial value; when no acknowledgement of the data is received, determining a second idle channel assessment threshold value, wherein the second idle channel assessment threshold value is smaller than an idle channel assessment initial value; if no channel idle is detected and the idle channel assessment initial value is not equal to the first idle channel assessment threshold, the idle channel assessment initial value is increased and the second idle channel assessment strategy is re-executed.

In one possible implementation, the determining unit is specifically configured to perform idle channel assessment detection according to an idle channel assessment initial value by the first node; transmitting data and attempting to receive an acknowledgement of the data if the channel is detected to be idle; when receiving the acknowledgement of the data, determining a second clear channel assessment threshold value to be equal to a clear channel assessment initial value; when no acknowledgement of the data is received, determining a second idle channel assessment threshold value, wherein the second idle channel assessment threshold value is smaller than an idle channel assessment initial value; if no channel idle is detected, and the idle channel assessment initial value is equal to the first idle channel assessment threshold value, executing a second idle channel assessment strategy; if no channel idle is detected and the idle channel assessment initial value is not equal to the first idle channel assessment threshold, increasing the idle channel assessment initial value and re-executing the third idle channel assessment strategy.

In a third aspect, embodiments of the present application provide a device for determining a clear channel assessment threshold, where the device may have a function in implementing any one of the foregoing first aspect and any one of the possible implementations of the first aspect. The function of the above-mentioned determination device of the clear channel assessment threshold may be implemented by hardware, or may be implemented by executing corresponding software by hardware, where the hardware or software includes one or more modules corresponding to the above-mentioned function.

The structure of the device comprises at least one processor and can also comprise at least one memory. The at least one processor is coupled to the at least one memory and operable to execute the computer program instructions stored in the memory to cause the apparatus to perform the method of any one of the above-described first aspect and any one of the possible implementations of the first aspect. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface. When the device is a server, the communication interface may be a transceiver or an input/output interface; when the device is a chip contained in a server, the communication interface may be an input/output interface of the chip. Alternatively, the transceiver may be a transceiver circuit and the input/output interface may be an input/output circuit.

In a fourth aspect, embodiments of the present application provide a chip system, including: a processor coupled to a memory for storing a program or instructions which, when executed by the processor, cause the system-on-a-chip to implement the method of any one of the possible implementations of the first aspect.

Optionally, the system on a chip further comprises an interface circuit for receiving code instructions and transmitting to the processor.

Alternatively, the processor in the chip system may be one or more, and the processor may be implemented by hardware or software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like. When implemented in software, the processor may be a general purpose processor, implemented by reading software code stored in a memory.

Alternatively, the memory in the system-on-chip may be one or more. The memory may be integral with the processor or separate from the processor, and is not limited in this application. For example, the memory may be a non-transitory processor, such as a ROM, which may be integrated on the same chip as the processor, or may be separately provided on different chips, and the type of memory and the manner of providing the memory and the processor are not specifically limited in this application.

In a fifth aspect, embodiments of the present application provide a readable storage medium having stored thereon a computer program or instructions which, when executed, cause a computer to perform the method of any one of the possible implementations of the first aspect, the first aspect described above.

In a sixth aspect, embodiments of the present application provide a computer program product which, when read and executed by a computer, causes the computer to perform the method of the first aspect or any one of the possible implementations of the first aspect.

In a seventh aspect, embodiments of the present application provide a determining apparatus for a clear channel assessment threshold, including a processor and an interface circuit;

the interface circuit is used for receiving code instructions and transmitting the code instructions to the processor;

the processor is configured to execute the code instructions to perform the method of any one of the possible implementations of the first aspect.

In an eighth aspect, embodiments of the present application provide a communication system including a first node and a second node;

wherein the first node is adapted to implement the method of the first aspect or any one of the possible implementations of the first aspect, and to communicate with the second node.

For example, a first node may send data to a second node, which may send an acknowledgement of the data to the first node.

The technical effects of any implementation manner of the second aspect to the eighth aspect may be referred to the technical effects of the first aspect, which are not described herein.

Drawings

Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application;

fig. 2 is a schematic diagram of determining a clear channel assessment threshold according to an embodiment of the present application;

fig. 3 is a schematic diagram of determining a clear channel assessment threshold according to an embodiment of the present application;

fig. 4 is a schematic diagram of determining a clear channel assessment threshold according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a determining device for a clear channel assessment threshold according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a determining device for clear channel assessment threshold according to an embodiment of the present application.

Detailed Description

The present application will be described in further detail with reference to the accompanying drawings.

The present application will present various aspects, embodiments, or features about a system that may include multiple devices, components, modules, etc. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. Furthermore, combinations of these schemes may also be used.

In addition, in the embodiments of the present application, the term "exemplary" is used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the term "exemplary" is intended to present concepts in a concrete fashion.

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 in 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 in the embodiments of the present application is also applicable to similar technical problems.

The following is a description of some of the terms of the embodiments of the present application to facilitate understanding by those skilled in the art.

1) A User Equipment (UE), also called a terminal device, is a device with a radio transceiver function, which can communicate with one or more Core Network (CN) devices via an access network device in a radio access network (radio access network, RAN).

User equipment may also be called an access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, user agent, user device, or the like. User devices may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); but may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.). The user equipment may be a cellular phone (cellular phone), cordless phone, session initiation protocol (session initiation protocol, SIP) phone, smart phone (smart phone), mobile phone (mobile phone), wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), etc. Alternatively, the user equipment may also be a handheld device, a computing device or other device connected to a wireless modem, an in-vehicle device, a wearable device, an unmanned aerial vehicle device or a terminal in the internet of things, a terminal in any of a fifth generation mobile communication (5 th-generation, 5G) network and a future network (e.g. 6G), a relay user equipment or a terminal in a future evolved public mobile land network (public land mobile network, PLMN), etc. The relay user equipment may be, for example, a 5G home gateway (residential gateway, RG). For example, the user device may be a Virtual Reality (VR) terminal, an augmented reality (augmented reality, AR) terminal, a wireless terminal in an industrial control (industrial control), a wireless terminal in a self driving (self driving), a wireless terminal in a remote medical (remote medical), a wireless terminal in a smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in a smart city (smart city), a wireless terminal in a smart home (smart home), and the like. The embodiment of the application is not limited to the type or kind of the terminal device.

2) Network device refers to a device that can provide a wireless access function for a terminal. Wherein the network device may support at least one wireless communication technology, such as long term evolution (long term evolution, LTE), new Radio (NR), next generation communication systems (e.g., 6G), etc.

Wherein the network device may comprise an access network device. By way of example, network devices include, but are not limited to: a next generation base station or next generation node B (gNB), evolved node B (eNB), radio network controller (radio network controller, RNC), node B (NB), base station controller (base station controller, BSC), base transceiver station (base transceiver station, BTS), home base station (e.g., home evolved node B, or home node B, HNB), baseband unit (BBU), transceiving point (transmitting and receiving point, TRP), transmitting point (transmitting point, TP), mobile switching center, small station, micro station, etc. in a 5G network. The network device may also be a wireless controller, a Centralized Unit (CU), and/or a Distributed Unit (DU) in the cloud wireless access network (cloud radio access network, CRAN) scenario, or the network device may be a relay station, an access point, an in-vehicle device, a terminal, a wearable device, and a network device in future mobile communication or a network device in a future evolved PLMN, etc.

The network device may also include a core network device. By way of example, the core network device may include an SMF or the like.

3) Relay device, an entity capable of receiving information from a terminal device, network device or other relay device and forwarding such information to other terminals, network devices or other relay devices. The name of the relay device may be a Relay Node (RN), and the form of the relay device may be a small station, an integrated wireless access and backhaul (IAB) node, a Distributed Unit (DU), a terminal device, a transceiver point (transmitter and receiver point, TRP), a relay transmission reception point (rTRP), an IAB node (IAB node), and the like. In NR, a relay node is generally referred to as an IAB node.

4) Clear Channel Assessment (CCA) detection to detect whether a channel is in an available state before transmitting data on the channel, CCA detection is effective to avoid collisions on the wireless channel. The channel being in an available state is also referred to as the channel being in a clear state, or the channel not being occupied, or the channel not being busy, or being detected by CCA. A channel being in an unavailable state is also referred to as a channel being in a non-idle state, or a channel being occupied, or a channel being busy, or not being detected by a CCA.

The content of the CCA detection includes one or more of: whether the signal strength of the channel is above a CCA threshold, or whether the channel is transmitting or receiving other data. The CCA threshold is also referred to as a CCA energy detection threshold.

The higher the CCA threshold, the more tolerant the interference, the easier it is to detect that the channel is in a idle state, whereas the lower the CCA threshold, the less tolerant the interference, and the less likely it is to detect that the channel is in a idle state.

In the CCA detection process, the first node determines whether the signal strength of the channel is higher than a CCA threshold, if so, it indicates that the signal strength of the channel is higher, and the channel is in an unavailable state, and if not, it indicates that the signal strength of the channel is lower, and the channel is in an available state. Wherein the signal strength of the channel includes the self-interference signal strength and/or the ambient interference signal strength generated by the first node, and the ambient interference refers to interference caused by other transmission systems (or other nodes transmitting or receiving data). In the related art, the CCA threshold is fixed and not adjustable.

5) Unlicensed bands have the property of sharing without permission, and communication devices communicate in a competitive spectrum over unlicensed bands. The unlicensed frequency bands include microwave unlicensed frequency bands and/or millimeter wave unlicensed frequency bands, etc., wherein the microwave unlicensed frequency bands include frequency bands of 2.4 gigahertz (GHz) and 5 GHz. Compared with the microwave unlicensed frequency band, the millimeter wave unlicensed frequency band has richer spectrum resources.

With the increasing demand of mobile communication services, the shortage of authorized frequency bands is increasingly evident, and the deployment of unauthorized frequency bands can relieve the pressure of authorized frequency bands. For communication scenes such as emergency, crowd gathering and the like, the deployment cost of the unlicensed frequency band is low, and the stability of communication can be ensured.

6) The full duplex mode refers to bidirectional transmission of data at the same time, i.e. data transmission and data reception operations are performed at the same time.

7) Based on the directional transmission characteristics of millimeter wave unlicensed band communication: two links based on millimeter wave unlicensed band communication have directionality, have small interference with each other, and still have interference.

8) The beamforming method is a signaling technique in a high frequency millimeter wave system. The beam refers to energy aggregation in a certain direction formed by superimposing different phase deviations on a plurality of transmitting units of a transmitting end (such as a relay device or a network device or a terminal device). Wherein the angle and width of the beam are limited by one or more factors such as the number of transmit elements, the size of the superimposed phases, and the order in which the phases are superimposed.

9) Antenna line of sight of backhaul link and access link: under the line-of-sight condition, the wireless signals transmitted through the wave beams are transmitted in a straight line between a transmitting end and a receiving end. Backhaul links refer to links between network devices (or relay devices), e.g., one of a transmitting end and a receiving end in a backhaul link is a network device and one is a relay device. An access link refers to a link between a network device (or relay device) and a terminal device, for example, one of a transmitting end and a receiving end of the access link is a relay device, and one is a terminal device. The location of the network device is fixed but the location of the terminal device may be moving. In general, the beam direction corresponding to the backhaul link is different from the beam direction corresponding to the access link, but because the position movement of the terminal device is not fixed, the beam direction corresponding to the backhaul link may overlap with the beam direction corresponding to the access link, thereby generating interference.

In the present application, "and/or" describing the association relationship of the association object, it means that there may be three relationships, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

Reference herein to at least one means one or more, and a plurality means two or more.

In addition, it should be understood that in the description of this application, the words "first," "second," and the like are used merely for distinguishing between the descriptions and not for indicating or implying any relative importance or order.

The technical scheme of the embodiment of the application can be applied to various communication systems. For example, the LTE system, the LTE frequency division duplex (frequency division duplex, FDD) system, the LTE time division duplex (time division duplex, TDD), the 5G communication system or NR, and other future communication systems such as 6G and the like, further support a communication system in which a plurality of wireless technologies are integrated, for example, a system in which a non-terrestrial network (non-terrestrial network, NTN) such as an unmanned aerial vehicle, a satellite communication system, and a high altitude platform (high altitude platform station, HAPS) communication is integrated with a terrestrial mobile communication network may also be applied.

The embodiment of the application is suitable for the node working in the full duplex mode of the unlicensed frequency band, for example, the node working in the full duplex mode of the unlicensed frequency band is a relay device. Fig. 1 is an example of a communication system suitable for use in embodiments of the present application, including a network device, a relay device, and a terminal device. For downlink transmission, the relay device receives data sent by the network device and forwards the data to the terminal device. For uplink transmission, the relay device receives data sent by the terminal device and forwards the data to the network device. In a transmission scenario, the network device is an upper node (also called a parent node or an upstream node) of the relay device, and the terminal device is a lower node (also called a child node or a downstream node) of the relay device.

Typically, the relay device establishes a wireless backhaul link with one or more upper nodes and accesses the core network through the upper nodes. The upper node may control the relay device (e.g., data scheduling, timing modulation, power control, etc.) through various signaling. In addition, the relay device may provide services to a plurality of subordinate nodes. The upper node of the relay device may be a base station, or may be another relay device; the subordinate node of the relay device may be another relay device; in addition, the relay device may also provide access service for the terminal device, where the terminal device is a subordinate node of the relay device. In the transmission scenario shown in fig. 1, the backhaul link refers to a link where the relay device communicates with an upper node, and the access link is a link where the relay device communicates with the terminal device.

Introducing IAB techniques into a communication system may further improve the performance of the communication system, but may squeeze the spectrum resources of the access link if the backhaul link occupies too much spectrum resources. Thus, the system capacity can be increased by full duplex technology, for example in fig. 1, an IAB node (a form of relay device) can send data to both an upper node (e.g., gNB) and a lower node (e.g., UE) at the same time.

In the communication scenario shown in fig. 1, self-interference may occur based on an unlicensed IAB node operating in full duplex mode. The IAB node listens to the channel using a listen before talk (listen before talk, LBT) mechanism and detects if the channel is clear using CCA detection. If the detection channel is idle, the IAB node performs data transmission. However, self-interference of the IAB node may have an influence on the CCA detection process, and the CCA detection accuracy is reduced.

And, interference can also be generated based on factors such as directional transmission characteristics of millimeter wave unlicensed frequency band communication, antenna line of sight of a return link and a receiving link, angle between transmission beams, and a beam forming method adopted, so that CCA detection accuracy is reduced.

Based on this, the embodiment of the application provides a method and a device for determining a clear channel assessment threshold, which can be applied to the communication scenario shown in fig. 1. In the method, the first node can adaptively adjust the idle channel assessment threshold according to the power range of the self-interference signal, and the influence of the self-interference signal of the node on idle channel assessment detection in the full duplex mode of the unlicensed frequency band is considered, so that the idle channel assessment detection precision can be improved.

Fig. 2 is a schematic diagram of a possible clear channel assessment threshold determination method according to an embodiment of the present application, including the following steps:

s201: the first node obtains a power range from the interfering signal.

The first node may be a relay device (e.g., an IAB node) in an exemplary full duplex mode in which the first node operates in an unlicensed frequency band.

In the embodiment of the present application, the first node is taken as an IAB node for illustration, and when the first node uses the same frequency to send and receive signals, or when the access link and the backhaul link of the first node are in the working mode at the same time, self-interference may be generated.

The first node may acquire the power range of the self-interfering signal without other transmission system interference (also referred to as environmental interference). Wherein no other transmission system interference means that the signal measured by the first node is guaranteed to be sent by itself rather than by other nodes in a period of time. Here is adopted

Representing the power range of the self-interfering signal, _a Iis the minimum value of the power range of the self-interference signal, < > for>

Is the maximum of the power range of the self-interfering signal.

S202: the first node determines a second clear channel assessment threshold according to the power range of the self-interference signal and the first clear channel assessment threshold.

The first clear channel assessment threshold is a clear channel assessment threshold set by the system, e.g. the first clear channel assessment threshold is the maximum value of the clear channel assessment thresholds set in the current transmission system (use a _max Indicated) or the minimum value of the clear channel assessment threshold set in the current transmission system (indicated by a) _min Representation).

The second idle channel evaluation threshold is an idle channel evaluation threshold adopted in the data transmission, and whether the channel is idle in the data transmission is detected based on the second idle channel evaluation threshold, namely if the channel is idle according to the second idle channel evaluation threshold, the data transmission can be performed.

In S202, the first node may determine whether to perform self-interference cancellation and/or determine a clear channel assessment policy adopted when the second clear channel assessment threshold is determined according to a comparison between the power range of the self-interference signal and the magnitude of the first clear channel assessment threshold.

Based on the comparison of the power range of the self-interference signal and the magnitude of the first clear channel assessment threshold, the following cases may be included:

case one: the maximum value of the power range of the self-interference signal is less than (or less than or equal to) the first clear channel assessment threshold.

In this case, it can be considered that the self-interference is relatively small, the influence on the detection result of the idle channel estimation is relatively small, and the first node can confirm that the self-interference cancellation is not performed.

Further, the first node may determine a second clear channel assessment threshold according to the first clear channel assessment policy.

In the first clear channel assessment policy, the first node may determine a second clear channel assessment threshold from a maximum value of a power range of the self-interference signal. For example, the first node may determine the second clear channel assessment threshold as

Where δ is a constant greater than 0, i.e. the firstThe two idle channel evaluation threshold values are equal to the sum value of the maximum value and the constant delta of the power range of the self-interference signal, so that the detection precision of idle channel evaluation is improved, and the performance of a communication system is improved. Alternatively, the first node may be preconfigured with the value of δ, or the network device may configure the first node with the value of δ.

And a second case: the minimum value of the power range of the self-interference signal is greater than (or, greater than or equal to) the first clear channel assessment threshold.

In this case, the self-interference ratio may be considered to be large, the influence on the idle channel estimation detection may be large, and the first node may determine to perform self-interference cancellation.

Further, the first node may determine a second clear channel assessment threshold according to a second clear channel assessment policy.

In the second idle channel assessment strategy, the first node performs self-interference cancellation, and performs idle channel assessment detection according to signal power (signal power after self-interference cancellation) and an idle channel assessment initial value. The clear channel assessment initial value is an initial value for determining the second clear channel assessment threshold, i.e. the second clear channel assessment threshold may be determined by adjusting the clear channel assessment initial value. Wherein the clear channel assessment initial value may be a set point or a second clear channel assessment threshold that may be determined for a last data transmission. The interference experienced during the signal transmission process generally includes self-interference and environmental interference, so that the signal power obtained after the self-interference cancellation herein includes the power of the environmental interference.

If a channel idle is detected (i.e., detected by idle channel assessment), the first node transmits data and attempts to receive an Acknowledgement (ACK) acknowledgement of the data.

When receiving an acknowledgement of the data, the first node determines the second clear channel assessment threshold to be equal to the clear channel assessment initial value. The first node may keep the current clear channel assessment initial value unchanged when a channel clear is detected and an acknowledgement of the data may be received.

When not receiving the dataThe first node determines a second clear channel assessment threshold that is less than the clear channel assessment initial value. That is, the first node may lower the clear channel assessment initial value to obtain the second clear channel assessment threshold. For example, the first node may decrease the first step value based on the clear channel assessment initial value to obtain the second clear channel assessment threshold. The first step value is a positive number, and the value obtained after the first step value is reduced is ensured to be greater than 0, so that the situation that the detection condition is too strict (for example, the second idle channel assessment threshold value is 0) can be avoided, and a channel for the data transmission cannot be detected. In one case, the value obtained by reducing the first step value based on the initial value of clear channel assessment is greater than or equal to the minimum value A of the clear channel assessment threshold set in the current transmission system _min . For another example, the first node may increase a value based on the initial value of the clear channel assessment, where the value is negative, and the value obtained after increasing the value is guaranteed to be greater than 0. Alternatively, the first node may scale down the clear channel assessment initial value to determine the second clear channel assessment threshold. For example, the first node may multiply a value, which is a positive fraction, on the basis of the initial value of the clear channel assessment. As another example, the first node may divide by a value that is greater than 1 based on the clear channel assessment initial value.

If no channel idle is detected (i.e., no idle channel assessment detection is passed), e.g., no channel idle is detected n consecutive times, n being a positive integer, whose idle assessment initial value is not equal to the first idle channel assessment threshold (at which time the idle channel assessment initial value is less than the first idle channel assessment threshold), the first node increases the idle channel assessment initial value and re-executes the second idle channel assessment policy. For example, the first node may increase the second step value based on the initial value of the clear channel assessment, and re-execute the second clear channel assessment policy, thereby adjusting the second clear channel assessment threshold. Wherein the second step value is positive, and the value obtained after the second step is increased is ensured to be far smaller than infinity, so that the signal with overlarge signal strength caused by too loose detection conditions can be avoidedThe track is detected as idle and the second step value may be the same or different from the first step value. In one case, the value obtained by adding the second step value to the clear channel assessment initial value is less than or equal to the maximum value A of the clear channel assessment threshold set in the current transmission system _max . When no idle channel is detected, namely the busy channel is detected, the first node considers that the current idle channel evaluation initial value is strict and is not easy to pass idle channel evaluation detection, and the idle channel evaluation detection can be performed again by adding the idle channel evaluation initial value. For another example, the first node may decrease a value based on the initial value of the clear channel assessment, where the value is negative, and the value obtained after decreasing the value is guaranteed to be far less than infinity. Or the first node may scale up the idle channel assessment initial value to determine a second idle channel assessment threshold. For example, the first node may multiply a value on the basis of the initial value of the clear channel assessment, the value being greater than 1. As another example, the first node may divide by a value that is a positive fraction based on the clear channel assessment initial value.

Illustratively, one possible procedure for determining the second clear channel assessment threshold according to the second clear channel assessment strategy is shown in fig. 3, comprising the steps of:

s301: the first node performs self-interference cancellation.

In this case, since the influence of the self-interference on the clear channel assessment detection is relatively large, the self-interference cancellation is performed in S301, and the influence of the self-interference can be reduced or cancelled to some extent.

S302: the first node performs clear channel assessment detection.

In this 302, the first node performs clear channel assessment detection based on the power after self-interference cancellation and a clear channel assessment initial value (denoted by θ). The power for idle channel estimation detection includes power after self-interference cancellation (i.e. interference caused by transmitting or receiving data by other nodes), so that whether a channel is idle or not can be detected by comparing the power after self-interference cancellation with an idle channel estimation initial value, that is, whether the transmitting or receiving data by other nodes can generate larger interference on the current data transmission or not can be detected.

S303: the first node judges whether the channel is idle according to the detection result of idle channel assessment; if yes, executing S304; if not, S309 is performed.

If the channel is detected to be idle, other nodes can be considered to send or receive data to generate less interference on the data transmission, and no conflict is generated with the data transmission. If the channel is not detected to be idle, other nodes can be considered to send or receive data to cause larger interference to the data transmission, and conflict with the data transmission.

S304: in the case of a channel idle, the first node transmits data.

S305: the first node judges whether an ACK response of the data is received or not; if yes, execute S306; if not, S307 is performed.

The first node may determine whether the channel in the current idle state may normally transmit data according to whether an ACK acknowledgement is received.

S306: the first node keeps the value of θ unchanged, i.e., sets the second clear channel assessment threshold to θ, and performs S313.

If the ACK response is received, the channel representing the current idle state can normally transmit data, and the first node does not influence the data transmission even if the theta value is not adjusted, so that the first node can keep the theta value unchanged.

S307: in the case where an ACK response of the data is not received, the first node judges whether θ is equal to θ _min The method comprises the steps of carrying out a first treatment on the surface of the If yes, execute S306; if not, S308 is performed.

Wherein θ is _min ＝A _min 。

If the ACK response is not received, the channel in the current idle state cannot normally transmit data, and the theta value used for detecting whether the channel is idle is loose, so that the first node can try to reduce the theta value, and the channel detection is performed again by adopting a stricter detection condition.

If θ is equal to θ _min Representing the currentThe value of θ is the most stringent detection condition, and the first node can not reduce the value of θ any more, so the value of θ can be kept unchanged.

S308: the first node decreases θ by Δθ, i.e., the second clear channel assessment threshold θ=θ—Δθ, and performs S313.

If θ is not equal to θ _min I.e. θ is greater than θ _min Indicating that the current θ value is not the most stringent detection condition, the first node may perform channel detection again for decreasing the θ value by the first step value Δθ.

S309: the first node judges whether the channel is busy for n times continuously; if so, S310 is performed; if not, S312 is performed.

If the channel is detected to be busy n times continuously, the θ value used for detecting whether the channel is idle is strict, so the first node can try to increase the θ value, and perform channel detection again with loose detection conditions, so as to avoid that the channel capable of performing the data transmission is filtered out under too strict detection conditions.

S310: the first node determines whether θ is equal to θ _max The method comprises the steps of carrying out a first treatment on the surface of the If not, executing S311; if so, S312 is performed.

If θ is equal to θ _max The current θ value is the looest detection condition, and the first node can not increase the θ value any more, so that the θ value can be kept unchanged.

If θ is not equal to θ _max I.e. θ is smaller than θ _max Indicating that the current θ value is not the looest detection condition, the first node may perform channel detection again by adding the second step value Δθ to the θ value. In this example, the second step value is the same as the first step value.

S311: the first node returns θ to S302 by increasing Δθ, i.e., the second clear channel assessment threshold θ=θ+Δθ.

S312: the first node holds the θ value unchanged and returns to S302.

In this case, the first node may try to perform channel detection again, so as to perform the data transmission when detecting that the channel is idle, and improve the timeliness of the data transmission.

S313: the first node determines whether a new data transmission requirement exists, and if so, returns to S302.

If no new data transmission requirement exists, the first node can keep the second idle channel assessment threshold value theta to carry out the data transmission.

And a third case: the minimum value of the power range of the self-interference signal is smaller than the first idle channel assessment threshold, and the maximum value of the power range of the self-interference signal is larger than the first idle channel assessment threshold, namely the first idle channel assessment threshold is located in the power range of the self-interference signal.

In this case, since the first clear channel assessment threshold is located in the power range of the self-interference signal, the self-interference may be larger or smaller, and the influence on the clear channel assessment detection is also uncertain, and at this time, the first node may or may not perform self-interference cancellation. Alternatively, the first node may not perform self-interference cancellation first, so as to reduce processing complexity of the first node, and then further determine whether to perform self-interference cancellation. For example, when no channel idle is detected and the idle channel assessment initial value is equal to the maximum value A of the set idle channel assessment threshold _max In the case of the present embodiment, the detection condition may be considered to be sufficiently relaxed but the channel for the present data transmission may not be detected, and the self-interference may be large, and the first node determines to perform self-interference cancellation.

Further, the first node may determine a second clear channel assessment threshold according to a third clear channel assessment policy.

In the third clear channel assessment strategy, the first node performs clear channel assessment detection according to the signal power (including the power of the self-interference signal and the power of the environmental interference) and the clear channel assessment initial value.

If a channel idle is detected, the first node transmits data and attempts to receive an acknowledgement of the data.

When receiving an acknowledgement of the data, the first node determines a clear channel assessment initial value as a second clear channel assessment threshold.

When no acknowledgement of the data is receivedThe first node determines a second clear channel assessment threshold that is less than the clear channel assessment initial value. For example, the first node may decrease the third step value based on the clear channel assessment initial value to obtain the second clear channel assessment threshold. The third step value is positive, and the value obtained after the third step value is reduced is ensured to be larger than 0, so that the situation that the channel for the data transmission cannot be detected due to too strict detection conditions can be avoided. In one case, the value obtained by reducing the third step value based on the initial value of clear channel assessment is greater than or equal to the minimum value A of the clear channel assessment threshold set in the current transmission system _min . For another example, the first node may increase a value based on the initial value of the clear channel assessment, where the value is negative, and the value obtained after increasing the value is guaranteed to be greater than 0. Alternatively, the first node may scale down the clear channel assessment initial value to determine the second clear channel assessment threshold. For example, the first node may multiply a value, which is a positive fraction, on the basis of the initial value of the clear channel assessment. As another example, the first node may divide by a value that is greater than 1 based on the clear channel assessment initial value.

If no channel idle is detected, e.g., no channel idle is detected n consecutive times and the idle channel assessment initial value is equal to the first idle channel assessment threshold, the first node performs a second idle channel assessment policy.

If no channel idle is detected, e.g., no channel idle is detected n consecutive times and the idle channel assessment initial value is not equal to the first idle channel assessment threshold, the first node increases the idle channel assessment initial value and re-executes the third idle channel assessment policy. For example, the first node may increase the fourth step value based on the idle channel assessment initial value, where the fourth step value is a positive number, and ensure that the value obtained after increasing the second step is far less than infinity, so that it may be avoided that the detection condition is too loose, so that the channel with too high signal strength is detected as idle, and the fourth step value and the third step value may be the same or different. In one case, the clear channel assessment initial value is increased by a fourth step valueA value less than or equal to the maximum value A of the clear channel assessment threshold set in the current transmission system _max . For another example, the first node may decrease a value based on the initial value of the clear channel assessment, where the value is negative, and the value obtained after decreasing the value is guaranteed to be far less than infinity. Or the first node may scale up the idle channel assessment initial value to determine a second idle channel assessment threshold. For example, the first node may multiply a value on the basis of the initial value of the clear channel assessment, the value being greater than 1. As another example, the first node may divide by a value that is a positive fraction based on the clear channel assessment initial value.

By way of example, one possible procedure for determining the second clear channel assessment threshold according to the third clear channel assessment strategy is shown in fig. 4, comprising the steps of:

the processes of S401 to S408 are referred to S302 to S309.

S409: the first node determines whether θ is equal to θ _max The method comprises the steps of carrying out a first treatment on the surface of the If not, executing S410; if so, a second clear channel assessment strategy is performed (e.g., steps shown in FIG. 3 are performed starting with S301 in FIG. 3 described above).

If θ is equal to θ _max The current theta value is the looest detection condition, and the channel may have larger self-interference, and at the moment, the first node executes the second idle channel assessment strategy to eliminate the self-interference, so that the influence caused by the self-interference can be weakened or eliminated to a certain extent.

The processes of S410 to S412 are described in S311 to S413.

In the idle channel assessment threshold determination method provided by the application, the first node adaptively adjusts the idle channel assessment threshold according to the power range of the self-interference signal, so that the influence of the self-interference on the detection result of the idle channel assessment can be weakened, and the detection accuracy of the idle channel assessment can be improved. And the first node dynamically decides whether to use the self-interference cancellation technology according to the power range of the self-interference signal, so that the use frequency of the self-interference cancellation technology is effectively reduced, the time resource utilization rate of the communication system is improved, and the system energy consumption increased by self-interference cancellation can be reduced.

The solutions provided in the embodiments of the present application are mainly described in terms of the method flows in fig. 2 to fig. 4. It will be appreciated that in order to achieve the above-described functions, the apparatus may comprise corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In case of an integrated unit, fig. 5 shows a possible exemplary block diagram of the clear channel assessment threshold determination means 500 referred to in the embodiments of the present application, which may be present in the form of software. The determining means 500 of the clear channel assessment threshold may comprise: an acquisition unit 501 and a determination unit 502.

The determining means 500 of the clear channel assessment threshold may be the first node described above, or may also be a chip provided in the first node. Specifically, in one embodiment, the acquiring unit 501 is configured to acquire a power range of the self-interference signal;

a determining unit 502, configured to determine a second clear channel assessment threshold according to the power range of the self-interference signal and the first clear channel assessment threshold.

In one possible design, the determining unit 502 is specifically configured to determine whether to perform self-interference cancellation according to the power range of the self-interference signal and the first idle channel assessment threshold, and determine the second idle channel assessment threshold.

In a possible design, the determining unit 502 is specifically configured to determine that no self-interference cancellation is performed in a case where a maximum value of the power range of the self-interference signal is smaller than the first clear channel assessment threshold, and determine a second clear channel assessment threshold according to the first clear channel assessment policy; under the condition that the minimum value of the power range of the self-interference signal is larger than the first idle channel assessment threshold value, determining to perform self-interference elimination, and determining a second idle channel assessment threshold value according to a second idle channel assessment strategy; and determining a second idle channel assessment threshold according to a third idle channel assessment policy under the condition that the minimum value of the power range of the self-interference signal is smaller than the first idle channel assessment threshold and the maximum value of the power range of the self-interference signal is larger than the first idle channel assessment threshold.

In a possible design, the determining unit 502 is specifically configured to determine the second clear channel assessment threshold according to a maximum value of the power range of the self-interference signal.

In a possible design, the determining unit 502 is specifically configured to transmit data and attempt to receive an acknowledgement of the data if the channel is detected to be idle; when receiving the acknowledgement of the data, determining a second clear channel assessment threshold value to be equal to a clear channel assessment initial value; when no acknowledgement of the data is received, determining a second idle channel assessment threshold value, wherein the second idle channel assessment threshold value is smaller than an idle channel assessment initial value; if no channel idle is detected and the idle channel assessment initial value is not equal to the first idle channel assessment threshold, the idle channel assessment initial value is increased and the second idle channel assessment strategy is re-executed.

In one possible design, the determining unit 502 is specifically configured to perform idle channel assessment detection by the first node according to the idle channel assessment initial value; transmitting data and attempting to receive an acknowledgement of the data if the channel is detected to be idle; when receiving the acknowledgement of the data, determining a second clear channel assessment threshold value to be equal to a clear channel assessment initial value; when no acknowledgement of the data is received, determining a second idle channel assessment threshold value, wherein the second idle channel assessment threshold value is smaller than an idle channel assessment initial value; if no channel idle is detected, and the idle channel assessment initial value is equal to the first idle channel assessment threshold value, executing a second idle channel assessment strategy; if no channel idle is detected and the idle channel assessment initial value is not equal to the first idle channel assessment threshold, increasing the idle channel assessment initial value and re-executing the third idle channel assessment strategy.

The division of the units in the embodiment of the application is schematic, which is merely a logic function division, and other division manners may be adopted in actual implementation. The functional units in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all or part of the technical solution contributing to the prior art or in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

As shown in fig. 6, another possible structural schematic diagram of a clear channel assessment threshold determining apparatus is provided in an embodiment of the present application, where the clear channel assessment threshold determining apparatus includes at least one processor 602 and at least one communication interface 604. Further, the image processing apparatus may further include a memory 606, where the memory 606 is configured to store a computer program or instructions. The memory 606 may be either internal or external to the processor. In the case where the respective unit modules described in fig. 6 are implemented by software, software or program codes necessary for the processor 602 to perform the corresponding actions are stored in the memory 606. The processor 602 is configured to execute programs or instructions in the memory 606 to implement the steps shown in fig. 2 to 4 in the above-described embodiments. The communication interface 604 is used to enable communication between the device and other devices.

In the case where the memory 606 is external to the processor, the memory 606, the processor 602, and the communication interface 604 are interconnected by a bus 608, which may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, or the like. It should be appreciated that buses may be divided into address buses, data buses, control buses, and the like. For ease of illustration, only one thick line is shown in fig. 6, but not only one bus or one type of bus.

It should be noted that, for the sake of brevity, the operations and/or functions of the respective modules in the apparatus 600 are not described herein again for implementing the respective flows of the methods shown in fig. 2 to 4.

The embodiment of the application also provides a chip system, which comprises: a processor coupled to the memory for storing programs or instructions which, when executed by the processor, cause the system-on-a-chip to implement the method of any of the method embodiments described above.

Alternatively, the processor in the system-on-chip may be one or more. The processor may be implemented in hardware or in software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like. When implemented in software, the processor may be a general purpose processor, implemented by reading software code stored in a memory.

The system-on-chip may be, for example, a field programmable gate array (field programmable gate array, FPGA), an application specific integrated chip (application specific integrated circuit, ASIC), a system on chip (SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), a microcontroller (micro controller unit, MCU), a programmable controller (programmable logic device, PLD) or other integrated chip.

It should be understood that the steps in the above-described method embodiments may be accomplished by integrated logic circuitry in hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor or in a combination of hardware and software modules in a processor.

The embodiment of the application also provides a computer readable storage medium, in which computer readable instructions are stored, which when read and executed by a computer, cause the computer to perform the method in any of the above method embodiments.

The present application also provides a computer program product which, when read and executed by a computer, causes the computer to perform the method of any of the method embodiments described above.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are produced in whole or in part. The computer may be the communication device described above. Computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. The computer readable storage medium may be the storage medium described above or the memory described above.

In one possible design, when the above determination of the clear channel assessment threshold is a chip, such as a chip in a relay device, the determination means of the clear channel assessment threshold may include one or more logic circuits, input/output interfaces (also referred to as communication interfaces, or interface circuits, or interfaces, or transceivers, etc.). The logic circuit may be a chip, a processing circuit, an integrated circuit, or a system on chip (SoC) chip, etc., and the interface circuit may be a communication interface, an input-output interface, etc. In the embodiment of the application, the logic circuit and the interface circuit may also be coupled to each other. The embodiments of the present application are not limited to specific connection modes of the logic circuit and the interface circuit.

Logic circuitry may be used to perform functions or operations, etc., performed by the first node described above. Logic circuitry may be configured to implement any of the method embodiments described above by executing code instructions. The interface circuit may be configured to receive signals from other communication devices than the determination of the clear channel assessment threshold and transmit signals from the logic circuit to the logic circuit or to other communication devices than the determination of the clear channel assessment threshold.

It should be appreciated that the processors referred to in the embodiments of the present application may be central processing units (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), off-the-shelf programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be understood that the memory referred to in the embodiments of the present application may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM).

Note that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, the memory (storage module) is integrated into the processor.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic of the processes, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

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

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

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

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for determining a clear channel assessment threshold, comprising:

the first node obtains a power range of the self-interference signal;

and the first node determines a second idle channel evaluation threshold according to the power range of the self-interference signal and the first idle channel evaluation threshold.

2. The method of claim 1, wherein the first node determining a second clear channel assessment threshold based on the power range of the self-interfering signal and a first clear channel assessment threshold comprises:

the first node determines whether to perform self-interference cancellation or not according to the power range of the self-interference signal and a first idle channel evaluation threshold value, and determines a second idle channel evaluation threshold value.

3. The method of claim 2, wherein the first node determining whether to perform self-interference cancellation based on the power range of the self-interference signal and a first clear channel assessment threshold, and determining a second clear channel assessment threshold comprises:

under the condition that the maximum value of the power range of the self-interference signal is smaller than the first idle channel assessment threshold value, the first node determines that self-interference elimination is not carried out, and determines a second idle channel assessment threshold value according to a first idle channel assessment strategy;

Under the condition that the minimum value of the power range of the self-interference signal is larger than the first idle channel assessment threshold value, the first node determines to perform self-interference elimination and determines a second idle channel assessment threshold value according to a second idle channel assessment strategy;

and under the condition that the minimum value of the power range of the self-interference signal is smaller than the first idle channel assessment threshold value and the maximum value of the power range of the self-interference signal is larger than the first idle channel assessment threshold value, the first node determines a second idle channel assessment threshold value according to a third idle channel assessment strategy.

4. The method of claim 3, wherein the determining a second clear channel assessment threshold according to a first clear channel assessment policy comprises:

and determining the second idle channel assessment threshold according to the maximum value of the power range of the self-interference signal.

5. The method of claim 3, wherein the determining a second clear channel assessment threshold according to a second clear channel assessment policy comprises:

performing self-interference elimination, and performing idle channel estimation detection according to the power and idle channel estimation initial value after the self-interference elimination;

If the channel is detected to be idle, the first node transmits data and tries to receive an acknowledgement of the data;

when receiving the acknowledgement of the data, the first node determines the second clear channel assessment threshold value to be equal to the clear channel assessment initial value;

when the acknowledgement of the data is not received, the first node determines a second idle channel assessment threshold value, wherein the second idle channel assessment threshold value is smaller than the idle channel assessment initial value;

if no channel idle is detected and the idle channel assessment initial value is not equal to the first idle channel assessment threshold, the first node increases the idle channel assessment initial value and re-executes the second idle channel assessment policy.

6. The method of claim 3, wherein the first node determining a second clear channel assessment threshold according to a third clear channel assessment policy comprises:

the first node performs idle channel assessment detection according to the idle channel assessment initial value;

if no channel idle is detected and the idle channel assessment initial value is equal to the first idle channel assessment threshold, the first node executes the second idle channel assessment policy;

if no channel idle is detected and the idle channel assessment initial value is not equal to the first idle channel assessment threshold, the first node increases the idle channel assessment initial value and re-executes the third idle channel assessment policy.

7. A clear channel assessment threshold determination apparatus, comprising:

an acquisition unit for acquiring a power range of the self-interference signal;

and the determining unit is used for determining a second idle channel evaluation threshold according to the power range of the self-interference signal and the first idle channel evaluation threshold.

8. The apparatus of claim 7, wherein the means for determining is configured to determine whether to perform self-interference cancellation based in particular on a power range of the self-interference signal and a first clear channel assessment threshold, and to determine a second clear channel assessment threshold.

9. The apparatus of claim 8, wherein the determining unit is specifically configured to determine that no self-interference cancellation is performed and to determine a second clear channel assessment threshold according to a first clear channel assessment policy, if a maximum value of a power range of the self-interference signal is less than the first clear channel assessment threshold; determining to perform self-interference cancellation and determining a second clear channel assessment threshold according to a second clear channel assessment policy, if the minimum value of the power range of the self-interference signal is greater than the first clear channel assessment threshold; and determining a second idle channel assessment threshold according to a third idle channel assessment policy under the condition that the minimum value of the power range of the self-interference signal is smaller than the first idle channel assessment threshold and the maximum value of the power range of the self-interference signal is larger than the first idle channel assessment threshold.

10. The apparatus according to claim 9, wherein the determining unit is configured to determine the second clear channel assessment threshold based in particular on a maximum value of the power range of the self-interference signal.

11. The apparatus according to claim 9, wherein the determining unit is specifically configured to transmit data and attempt to receive an acknowledgement of the data if a channel idle is detected; when an acknowledgement of the data is received, determining the second clear channel assessment threshold to be equal to the clear channel assessment initial value; when the acknowledgement of the data is not received, determining the second idle channel assessment threshold value, wherein the second idle channel assessment threshold value is smaller than the idle channel assessment initial value; if no channel idle is detected and the idle channel assessment initial value is not equal to the first idle channel assessment threshold, the idle channel assessment initial value is increased and the second idle channel assessment policy is re-executed.

12. The apparatus of claim 9, wherein the determining unit is specifically configured to perform clear channel assessment detection by the first node according to a clear channel assessment initial value; transmitting data and attempting to receive an acknowledgement of the data if the channel is detected to be idle; when receiving the acknowledgement of the data, determining the second clear channel assessment threshold value to be equal to a clear channel assessment initial value; when the acknowledgement of the data is not received, determining the second idle channel assessment threshold value, wherein the second idle channel assessment threshold value is smaller than the idle channel assessment initial value; if no channel idle is detected and the idle channel assessment initial value is equal to the first idle channel assessment threshold, executing the second idle channel assessment strategy; if no channel idle is detected and the idle channel assessment initial value is not equal to the first idle channel assessment threshold, increasing the idle channel assessment initial value and re-executing the third idle channel assessment policy.

13. An apparatus for determining a clear channel assessment threshold, the apparatus comprising at least one processor coupled to at least one memory:

The at least one processor configured to execute a computer program or instructions stored in the at least one memory to cause the apparatus to perform the method of any one of claims 1-6.

14. A readable storage medium storing instructions which, when executed, cause a method according to any one of claims 1-6 to be implemented.

15. A clear channel assessment threshold determination apparatus, comprising a processor and interface circuitry;

the processor is configured to execute the code instructions to implement the method of any of claims 1-6.