WO2023011106A1

WO2023011106A1 - Communication method and apparatus

Info

Publication number: WO2023011106A1
Application number: PCT/CN2022/104582
Authority: WO
Inventors: 乔梁; 余官定; 殷锐
Original assignee: 华为技术有限公司
Priority date: 2021-08-05
Filing date: 2022-07-08
Publication date: 2023-02-09
Also published as: CN115942501A

Abstract

Embodiments of the present application disclose a communication method and apparatus. The method is applied to an IAB node. The IAB node is connected to a terminal device by means of a wireless access link. The IAB node is connected to an IAB host by means of a wireless backhaul link. The method comprises: the IAB node determining a first range by means of self-interference channel estimation and self-interference cancellation, the first range being a range of an energy detection threshold detected by CCA, self-interference being interference of a first channel to a second channel, the first channel being a channel between the IAB node and the IAB host, and the second channel being a channel between the IAB node and the terminal device; determining a first energy detection threshold, the first energy detection threshold being within a first range; performing CCA detection on the second channel; and, when the energy of the second channel is less than or equal to the first energy detection threshold, sending a signal to the terminal device by means of the second channel. In the embodiments of the present application, CCA detection efficiency can be increased.

Description

A communication method and device

This application claims the priority of the Chinese patent application with the application number 202110897487.8 and the application title "A Communication Method and Device" submitted to the China Patent Office on August 5, 2021, the entire contents of which are incorporated in this application by reference.

technical field

The embodiments of the present application relate to the field of communication technologies, and in particular, to a communication method and device.

Background technique

The integrated access and backhaul (IAB) technology is a technology in which both the access link and the backhaul link use wireless transmission. In order to broaden spectrum resources, unlicensed spectrum can be introduced into the IAB network. However, when more spectrum resources are occupied on the backhaul link, it will affect the spectrum resources on the access link. Therefore, in order to solve the above problems, full-duplex technology can be introduced in the IAB network, so that the backhaul link and the access link can use the same spectrum resources.

When the IAB node (node) sends a signal to the IAB donor (donor), and the IAB node sends a signal to the terminal device at the same time, the signal transmitted on the backhaul link will interfere with the signal transmitted on the access link, and this interference is called called "self-interference". Before the IAB node uses the unlicensed spectrum to send signals on the access link, it first needs to use the listen before talk (LBT) mechanism to monitor the channel, and only sends the signal when the channel is detected to be idle. When monitoring a channel, it is possible to detect whether the channel is idle through clear channel assessment (CCA), but self-interference will affect CCA detection, thereby reducing the efficiency of CCA detection.

Contents of the invention

The embodiment of the present application discloses a communication method and device for improving CCA detection efficiency.

The first aspect discloses a communication method. The communication method can be applied to an IAB node, and can also be applied to a module (for example, a chip) in the IAB node. The following uses the IAB node as an example for illustration. The IAB node is connected to the terminal device through a wireless access link, and the IAB node is connected to the IAB host through a wireless backhaul link. The communication method may include: the IAB node determines the first range through self-interference channel estimation and self-interference cancellation, the first range is the range of the energy detection threshold detected by CCA, the self-interference is the interference of the first channel to the second channel, the second One channel is the channel between the IAB node and the IAB host, the second channel is the channel between the IAB node and the terminal equipment; determine the first energy detection threshold, the first energy detection threshold is in the first range; the second channel is CCA detection: when the energy on the second channel is less than or equal to the first energy detection threshold, sending a signal to the terminal device through the second channel.

In the embodiment of the present application, before the IAB node performs the CCA detection, self-interference cancellation can be performed first, and the influence of the self-interference on the CCA detection can be eliminated, thereby improving the efficiency of the CCA detection. In addition, the determined energy detection threshold is within the range of the energy detection threshold determined according to self-interference cancellation, which can ensure that when performing CCA detection, it can be accurately determined whether the channel is busy or idle according to the determined energy detection threshold, which can avoid the channel being idle However, when the detection result is busy, or the channel is originally busy but the detection result is idle, the accuracy of CCA detection can be improved.

As a possible implementation manner, determining the first range by the IAB node through self-interference channel estimation and self-interference cancellation includes: the IAB node performs self-interference channel estimation to obtain the first interference; performs self-interference cancellation according to the first interference to obtain the second range, The second range is a range of self-interference remaining after self-interference cancellation; the first range is determined according to the second range.

In the embodiment of the present application, the range of the energy detection threshold is determined according to the range of the remaining self-interference after the self-interference is eliminated, and the influence of the self-interference that is not eliminated after the self-interference is eliminated on the CCA detection can be further improved. accuracy.

As a possible implementation manner, the IAB node determining the first range according to the second range includes: the IAB node determines the minimum value of the first range according to the maximum value of the second range and the bandwidth of the first channel; value, the bandwidth of the first channel, and the maximum transmission power of the IAB node, determine the maximum value of the first range.

As a possible implementation manner, the IAB node determining the first energy detection threshold includes: the IAB node determining the second energy detection threshold; when the CCA detection is the first CCA detection after interference channel estimation, the second energy detection threshold Determined as the first energy detection threshold; when the CCA detection is the Kth CCA detection after self-interference channel estimation, the sum of the energy detection threshold of the K-1th CCA detection and the K-1th adjustment value is determined as the first Energy detection threshold, K is an integer greater than 1.

In the embodiment of the present application, only one initial energy detection threshold needs to be determined after one self-interference channel estimation, which reduces the number of determinations of the initial energy detection threshold, reduces the processing procedure of the IAB node, and thus reduces the power consumption of the IAB node. The energy detection threshold can be dynamically adjusted according to the difference of CCA detection, and the efficiency of CCA detection can be improved.

As a possible implementation manner, the IAB node determining the second energy detection threshold includes: the IAB node determining the second energy detection threshold according to the first range.

In the embodiment of the present application, the initial energy detection threshold after one self-interference channel estimation is determined according to the range of the energy detection threshold, and the influence of self-interference on CCA detection is considered, so that the efficiency of CCA detection can be improved.

As a possible implementation manner, the IAB node determining the first energy detection threshold includes: the IAB node determines the third energy detection threshold according to the time of the CCA detection; when the CCA detection is the first CCA detection after the interference channel estimation, the The third energy detection threshold is determined as the first energy detection threshold; when the CCA detection is the Kth CCA detection after self-interference channel estimation, the sum of the third energy detection threshold and the K-1th adjustment value is determined as the first energy Detection threshold, K is an integer greater than 1.

In the embodiment of this application, after a self-interference channel estimation, each CCA detection needs to re-determine the initial energy detection threshold, and the initial energy detection threshold is related to the time of CCA detection, and the optimal initial energy detection threshold can be determined according to the current situation , can improve the accuracy of determining the initial energy detection threshold, thereby further improving the accuracy of CCA detection.

As a possible implementation manner, the IAB node determining the third energy detection threshold according to the CCA detection time includes: the IAB node determining the third energy detection threshold according to the CCA detection time and the first range.

In the embodiment of the present application, the initial energy detection threshold of CCA detection after a self-interference channel estimation is determined according to the range of the energy detection threshold and the time of CCA detection, taking into account the time of CCA detection and the influence of self-interference on CCA detection, Therefore, the accuracy of CCA detection can be further improved.

As a possible implementation manner, the i-th adjustment values are all the same, i=1, 2, . . . , K.

In the embodiment of the present application, using the same adjustment value can avoid the number of times the IAB node determines the adjustment value, can reduce the processing complexity of the IAB node, and thus can reduce the power consumption of the IAB node.

As a possible implementation, when K is greater than 2, when the interference power is less than the first energy detection threshold and no acknowledgment (acknowledge, ACK) response from the terminal device is received for N consecutive times, the K-th adjustment value is the difference between the K-1th adjustment value and the adjustment threshold, and N is an integer greater than 1; when the interference power is less than the first energy detection threshold and the ACK response from the terminal device is received, the Kth adjustment value is the first K-1 adjustment value; when the interference power for M consecutive times is greater than the first energy detection threshold, the Kth adjustment value is the sum of the K-1th adjustment value and the adjustment threshold, and M is an integer greater than 1.

In the embodiment of the present application, the energy detection threshold can be dynamically adjusted according to whether an ACK response is received after the signal is sent, or the number of times the channel is busy is continuously detected, which can further improve the accuracy of the energy detection threshold, and further improve the accuracy of the CCA detection. accuracy.

The second aspect discloses a communication device. The communication device may be an IAB node, or may be a module (for example, a chip) in the IAB node. The IAB node is connected to the terminal equipment through a wireless access link, and the IAB node is connected to the IAB host through a wireless backhaul link. The communication device may include:

The first determination unit is configured to determine the first range through self-interference channel estimation and self-interference cancellation, the first range is the range of the energy detection threshold for CCA detection, self-interference is the interference of the first channel to the second channel, and the first channel is the channel between the IAB node and the IAB host, and the second channel is the channel between the IAB node and the terminal device;

a second determining unit, configured to determine a first energy detection threshold, where the first energy detection threshold is within a first range;

a detection unit, configured to perform CCA detection on the second channel;

The sending unit is configured to send a signal to the terminal device through the second channel when the energy on the second channel is less than or equal to the first energy detection threshold.

As a possible implementation manner, the first determining unit is specifically configured to:

performing self-interference channel estimation to obtain the first interference;

performing self-interference cancellation according to the first interference to obtain a second range, where the second range is the remaining self-interference range after self-interference cancellation;

The first range is determined based on the second range.

As a possible implementation manner, the first determining unit determining the first range according to the second range includes:

determining the minimum value of the first range according to the maximum value of the second range and the bandwidth of the first channel;

Determine the maximum value of the first range according to the maximum value of the second range, the bandwidth of the first channel, and the maximum transmission power of the IAB node.

As a possible implementation manner, the second determining unit is specifically configured to:

determining a second energy detection threshold;

When the CCA detection is the first CCA detection after the interference channel estimation, the second energy detection threshold is determined as the first energy detection threshold;

When the CCA detection is the Kth CCA detection after the interference channel estimation, the sum of the energy detection threshold of the K-1th CCA detection and the K-1th adjustment value is determined as the first energy detection threshold, and K is greater than 1 an integer of .

As a possible implementation manner, determining the second energy detection threshold by the second determining unit includes:

According to the first range, a second energy detection threshold is determined.

determining a third energy detection threshold according to the time of CCA detection;

When the CCA detection is the first CCA detection after the interference channel estimation, the third energy detection threshold is determined as the first energy detection threshold;

When the CCA detection is the Kth CCA detection after interference channel estimation, the sum of the third energy detection threshold and the K-1th adjustment value is determined as the first energy detection threshold, and K is an integer greater than 1.

As a possible implementation manner, the second determining unit determining the third energy detection threshold according to the time of CCA detection includes: determining the third energy detection threshold according to the time of CCA detection and the first range.

As a possible implementation, when K is greater than 2, when the interference power is less than the first energy detection threshold and the ACK response from the terminal device has not been received for N consecutive times, the K-th adjustment value is the K-1th The difference between the adjustment value and the adjustment threshold, N is an integer greater than 1;

When the interference power is less than the first energy detection threshold and an ACK response from the terminal device is received, the Kth adjustment value is the K-1th adjustment value;

When the interference power for M consecutive times is greater than the first energy detection threshold, the Kth adjustment value is the sum of the K-1th adjustment value and the adjustment threshold, and M is an integer greater than 1.

The third aspect discloses a communication device. The communication device may be an IAB node, or may be a module (for example, a chip) in the IAB node. The communication device may include a processor, a memory, an input interface and an output interface, the input interface is used to receive information from other communication devices other than the communication device, and the output interface is used to send information to other communication devices other than the communication device Outputting information, when the processor executes the computer program stored in the memory, the processor executes the communication method disclosed in the first aspect or any implementation manner of the first aspect.

The fourth aspect discloses a computer-readable storage medium, on which a computer program or computer instruction is stored, and when the computer program or computer instruction is run, the first aspect or any implementation manner of the first aspect is realized Open communication methods.

The fifth aspect discloses a chip, including a processor configured to execute a program stored in a memory, and when the program is executed, the chip executes the communication method disclosed in the first aspect or any implementation manner of the first aspect.

As a possible implementation manner, the memory is located outside the chip.

The sixth aspect discloses a computer program product, the computer program product includes computer program code, and when the computer program code is executed, the communication method disclosed in the first aspect or any implementation manner of the first aspect is executed.

Description of drawings

FIG. 1 is a schematic diagram of a network architecture disclosed in an embodiment of the present application;

FIG. 2 is a schematic flowchart of a communication method disclosed in an embodiment of the present application;

Fig. 3 is a schematic diagram of determining a first energy detection threshold disclosed in an embodiment of the present application;

Fig. 4 is another schematic diagram of determining the first energy detection threshold disclosed in the embodiment of the present application;

5 is a schematic diagram of an IAB node access link transmission power and access link throughput disclosed in an embodiment of the present application;

FIG. 6 is a schematic diagram of an adjustment threshold and access link throughput disclosed in an embodiment of the present application;

7 is a schematic diagram of another IAB node access link transmission power and access link throughput disclosed in the embodiment of the present application;

FIG. 8 is a schematic structural diagram of a communication device disclosed in an embodiment of the present application;

FIG. 9 is a schematic structural diagram of another communication device disclosed in the embodiment of the present application;

Fig. 10 is a schematic structural diagram of another communication device disclosed in the embodiment of the present application.

Detailed ways

The embodiment of the present application discloses a communication method and device system for improving the efficiency of CCA detection. Each will be described in detail below.

In order to better understand the embodiment of the present application, the related technologies of the embodiment of the present application are firstly described below.

The fifth generation of mobile communication technology (5th generation, 5G) puts forward more stringent requirements for network performance indicators, such as: capacity indicators increased by 1000 times, wider coverage requirements, ultra-high reliability and ultra-low latency, etc. In order to meet the requirements of 5G ultra-high capacity, high-frequency small cells are used to form a network in hotspot areas. However, due to problems such as poor propagation characteristics of high-frequency carriers, severe shadowing attenuation, and limited coverage, a large number of small cells need to be densely deployed, resulting in the need for a large number of optical fibers for backhaul, and the deployment of optical fibers is relatively difficult. In addition, in order to meet the requirements of 5G wide coverage, it is necessary to provide network coverage in some remote areas, and the deployment of optical fibers is relatively difficult.

In order to solve the above problems, the industry has introduced an integrated access and backhaul (IAB) technology in which both the access link and the backhaul link use wireless transmission. In an IAB network, a terminal device can access an IAB node (node) through a wireless access link, and the IAB node can be connected to an IAB donor (donor) node through a wireless backhaul link.

In scenarios such as emergencies and crowd gatherings, in order to broaden spectrum resources, unlicensed spectrum can be introduced into the IAB network. However, due to the sharing of unlicensed spectrum resources, it is easy to cause the same resource to be used by different communication devices at the same time. Therefore, a reasonable resource competition mechanism is needed to ensure fair coexistence between different communication devices using the same unlicensed spectrum. competition for resources.

At present, the commonly used resource competition mechanism is the listen before talk (LBT) mechanism. This mechanism requires communication devices to monitor the channel and perform clear channel assessment (CCA) detection before using unlicensed spectrum resources to send signals, so as to ensure that the signal can only be transmitted when the channel is idle. Wherein, the CCA detecting that the channel is idle may be referred to as LBT success, and the CCA detecting that the channel is busy may also be referred to as LBT failure.

When performing CCA detection, the communication device may adopt a detection method based on signal energy, and/or may adopt a detection method based on signal type. Wherein, in the detection method based on signal energy, the communication device can judge the state of the channel through a set energy detection threshold (energy detection threshold). When the communication device detects that the signal energy in the channel exceeds the energy detection threshold, it determines that the channel is busy, and when the communication device detects that the signal energy in the channel is less than the energy detection threshold, it determines that the channel is idle.

Therefore, before the IAB node sends a signal to the terminal device, the IAB node first needs to perform CCA detection.

However, when there are many unlicensed spectrum resources occupied on the backhaul/or access link, it will have an impact on the unlicensed spectrum resources on the access/backhaul link. Therefore, in order to solve the above problems, full-duplex technology can be introduced in the IAB network, so that the backhaul link and the access link can use the same spectrum resource.

When the IAB node uses full-duplex technology, when the IAB node sends a signal to the IAB host, and the IAB node sends a signal to the terminal device at the same time, the signal transmitted on the backhaul link will have an impact on the signal transmitted on the access link. Interference, that is, self-interference. The self-interference will cause the signal energy on the channel between the IAB node and the terminal device to be large, so that the channel may be idle during CCA detection but the detection result is busy, which will affect the CCA detection and reduce the CCA detection efficiency. It can be seen that how to improve the detection efficiency of CCA has become an urgent technical problem to be solved.

In order to better understand the embodiment of the present application, the following describes the network architecture used in the embodiment of the present application. Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a network architecture disclosed in an embodiment of the present application. As shown in FIG. 1, the network architecture may include an IAB host, an IAB node, and a terminal device. The IAB node and the terminal device can communicate through the Uu interface of the new radio (NR), and the IAB node and the IAB host can communicate through the wireless backhaul (BH) link. The Uu interface is the wireless interface (the radio interference between UTRAN and UE). Usually, the priority of the backhaul link is higher than that of the access link. When the IAB node and the IAB host transmit signals, neither the IAB node nor the IAB host needs to perform channel detection. Before the IAB node and the terminal device send a signal to the opposite end, the IAB node or the terminal device first needs to perform a channel idle detection, and only sends a signal when the channel is idle.

The IAB host is an access network device supporting the IAB node. Including but not limited to: evolved node B (evolved node base, eNB), radio network controller (radio network controller, RNC), node B (node B, NB), base station controller (base station controller, BSC), base station Transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home node B, HNB), baseband unit (baseband unit, BBU), long term evolution (long term evolution, LTE) (evolved LTE, eLTE) base station, NR base station (next generation node B, gNB) or base station of next generation communication system, etc.

The IAB node is used to provide access services and backhaul services for terminal devices. The IAB node can be regarded as a relay node, which can be one of the above-mentioned access network devices or terminal devices with a forwarding function, or can be an independent device form. In this application, an IAB node may generally refer to any node or device with a relay function. For example, the IAB node may be a module or device set on a mobile object, and the mobile object includes but is not limited to devices in the Internet of Things, such as automobiles, trains, and airplanes. The use of IAB node and relay node in this application should be understood to have the same meaning.

Terminal equipment, also called user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a device that provides voice and/or data connectivity to users. equipment. The terminal device can be a handheld terminal, a notebook computer, a subscriber unit (subscriber unit), a cellular phone (cellular phone), a smart phone (smart phone), a wireless data card, a personal digital assistant (personal digital assistant, PDA) computer, a tablet computer , wireless modem (modem), handheld device (handheld), laptop computer (laptop computer), cordless phone (cordless phone) or wireless local loop (wireless local loop, WLL) station, machine type communication (machine type communication, MTC) terminals, wearable devices (such as smart watches, smart bracelets, pedometers, etc.), vehicle-mounted devices (such as cars, bicycles, electric vehicles, airplanes, ships, trains, high-speed rail, etc.), virtual reality (virtual reality, VR ) equipment, augmented reality (augmented reality, AR) equipment, wireless terminals in industrial control (industrial control), smart home equipment (such as refrigerators, TVs, air conditioners, electricity meters, etc.), intelligent robots, workshop equipment, driverless (self Wireless terminals in driving, wireless terminals in remote medical surgery, wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city Terminals, or wireless terminals in smart homes, flying devices (such as intelligent robots, hot air balloons, drones, airplanes, etc.) or other devices that can access the network.

It should be noted that the system architecture shown in FIG. 1 may not be limited to include only the network elements and devices shown in the figure, but may also include other network elements or devices not shown in the figure. List them all.

Based on the foregoing network architecture, please refer to FIG. 2 , which is a schematic flowchart of a communication method disclosed in an embodiment of the present application. As shown in Fig. 2, the communication method may include the following steps.

201. The IAB node determines the first range through self-interference channel estimation and self-interference cancellation.

The IAB node may determine the first range through self-interference channel estimation and self-interference cancellation. The first range is the range of the energy detection threshold for CCA detection. The self-interference is the interference of the first channel to the second channel, the first channel is the channel between the IAB node and the IAB host, and the second channel is the channel between the IAB node and the terminal device. It can be seen that the self-interference is the interference of the channel on the backhaul link to the channel on the access link.

The IAB node may first perform self-interference channel estimation to obtain the interference range, that is, the IAB node may determine the interference of the first channel to the second channel to obtain the interference range. The interference range can be understood as the interval range of the value of the self-interference. The IAB node may perform self-interference channel estimation periodically, may also perform self-interference channel estimation when sending signals to the terminal equipment, and may also perform self-interference channel estimation before using the first channel and the second channel to transmit signals. Exemplarily, the first interference may be an interval range, that is, an interval range of values of the self-interference.

Then the IAB node can perform self-interference cancellation according to the interference range to obtain the second range. The second range is the range of the remaining self-interference after the self-interference is eliminated, which can be understood as the range of the self-interference that has not been eliminated, and can also be understood as the residual self-interference. After self-interference channel estimation, the IAB node can perform self-interference cancellation in real time. In one case, the IAB node can detect the energy on the second channel, and can use the energy on the second channel to subtract the first interference to obtain the second range. In another case, the IAB can detect the first energy on the first channel and the second energy on the second channel, then can use the second energy to subtract the first energy to get the difference, and finally can use the difference to multiply The second range is obtained with the above-mentioned first interference.

Finally, the IAB node can determine the first range according to the second range. The IAB can determine the minimum value of the first range according to the maximum value of the second range and the bandwidth of the second channel, and can determine the minimum value of the first range according to the maximum value of the second range, the bandwidth of the second channel, and the maximum transmission power of the IAB node. maximum value.

For example, when the standard used is the European Telecommunications Standards Institute (ETSI) standard, the relationship between the maximum transmission power _PH of the IAB node and the energy detection threshold can be shown in Table 1:

P _H P _H	能量检测门限Energy Detection Threshold
P _H≤13dBm P _H ≤13dBm	-75dBm/MHz+I ₁ -75dBm/MHz+I ₁
13dBm＜P _H＜23dBm 13dBm＜ _PH ＜23dBm	TL+23dBm-P _H+I ₁ TL+23dBm-P _H +I ₁
P _H≥23dBm P _H≥23dBm	TL+I ₁ TL+I ₁

Table 1

Wherein, TL=-85dBm/MHz+10*log(BW), BW is the bandwidth of the second channel, and I ₁ is the maximum value of the second range, that is, the maximum value of the remaining self-interference after interference cancellation. According to Table 1, it can be determined that the first range is [TL+I ₁ , TL+23dBm-P _H +I ₁ ].

It should be understood that the above is an illustration of determining the first range based on the second range, and does not constitute a limitation thereto. For example, when other criteria are used, the above-mentioned interval division of _PH may change. For another example, the energy detection thresholds corresponding to different _pH intervals may change.

In one case, the first range may be determined after self-interference channel estimation and before the first CCA detection. There is only one first range for one self-interference channel estimation. In another case, a first range may be determined before each CCA detection. For multiple CCA detections after one self-interference channel estimation, multiple first ranges may be determined, and the multiple first ranges may be the same or different.

202. The IAB node determines a first energy detection threshold.

In one case, the IAB node may determine a second energy detection threshold. When the CCA detection is the first CCA detection after interference channel estimation, the second energy detection threshold may be determined as the first energy detection threshold. When the CCA detection is the Kth CCA detection after interference channel estimation, the sum of the energy detection threshold of the K-1th CCA detection and the K-1th adjustment value may be determined as the first energy detection threshold. K is an integer greater than 1. The first adjustment value may be configured by the IAB host, or may be pre-configured according to a protocol. It can be seen that the first adjustment value is a known value.

The second energy detection threshold may be understood as the initial energy detection threshold. It can be seen that there is only one initial energy detection threshold for all CCA detections after one self-interference channel estimation. Please refer to FIG. 3 . FIG. 3 is a schematic diagram of determining a first energy detection threshold disclosed in an embodiment of the present application. As shown in FIG. 3 , the energy detection threshold TL ₁ of the first CCA detection after the interference channel estimation, namely CCA ₁ , is the optimal initial energy detection threshold TL _best . When the first CCA detection is completed, the sum of the energy detection threshold TL ₁ of the first CCA detection and the first adjustment value TL _adjust (t ₁ ) can be determined as the energy detection threshold TL ₁ at the end of the first CCA detection (t ₁ ). The energy detection threshold TL ₁ (t ₁ ) at the end of the first CCA detection can be determined as the energy detection threshold TL ₂ of the second CCA detection, and so on.

The IAB node may determine the second energy detection threshold according to the first range. The IAB node may determine the energy detection threshold corresponding to the maximum throughput on the access link among the energy detection thresholds in the first range as the second energy detection threshold.

In another case, the IAB may determine the third energy detection threshold according to the time of CCA detection. When the CCA detection is the first CCA detection after the interference channel estimation, the third energy detection threshold can be determined as the first energy detection threshold, and when the CCA detection is the Kth CCA detection after the interference channel estimation, it can be The sum of the third energy detection threshold and the K-1th adjustment value is determined as the first energy detection threshold. K is an integer greater than 1. The first adjustment value may be configured by the IAB host, or may be pre-configured. It should be understood that the first adjustment value here may be the same as or different from the above first adjustment value.

Different CCA detection times determine different third energy detection thresholds, that is, different CCA detection times determine different initial energy detection thresholds (ie, third energy detection thresholds). It can be seen that different CCA detections after one self-interference channel estimation all need to determine corresponding initial energy detection thresholds. Please refer to FIG. 4 . FIG. 4 is another schematic diagram of determining the first energy detection threshold disclosed in the embodiment of the present application. As shown in Fig. 4, _the energy detection threshold TL ₁ (t 1 ) of the first CCA detection after the interference channel estimation, namely CCA ₁ , is the optimal initial energy detection threshold TL _best (t ₁ ) at the first moment. The first moment is the start moment of the first CCA detection. When the first CCA detection is completed, the sum of the optimal initial energy detection threshold TL _best (t ₂ ) and the first adjustment value TL _adjust (t ₂ ) at the second moment can be determined as the Energy detection threshold TL ₁ (t ₂ ). The second moment is the end moment of the first CCA detection. The sum of the optimal initial energy detection threshold TL _best (t ₃ ) and the first adjustment value TL _adjust (t ₂ ) at the third moment can be determined as the energy detection threshold TL ₂ (t ₃ ) for the second CCA detection, to And so on. The third moment is the start moment of the second CCA detection.

The IAB node may determine the third energy detection threshold according to the third range. The third range is the range of self-interference remaining after self-interference cancellation corresponding to the time of CCA detection. When CCA detection is to be performed, the IAB node may perform self-interference cancellation first to obtain the third range. After that, the IAB node may determine the energy detection threshold corresponding to the maximum system throughput among the energy detection thresholds in the third range as the third energy detection threshold. It can be seen that the third energy detection thresholds corresponding to different CCA detection times may be different. For a detailed description of self-interference cancellation, reference may be made to the relevant description of step 201 .

In one case, the i-th adjustment values are all the same, i=1, 2, . . . , K. It can be seen that the adjustment value for each CCA detection can be the same.

In another case, when K is greater than 2, when the interference power is less than or equal to the first energy detection threshold and no acknowledgment (acknowledge, ACK) response is received from the terminal equipment for N consecutive times, the K-th adjustment The value is the difference between the K-1th adjustment value and the adjustment threshold. It can be seen that when the second channel is detected to be idle during the K-1 CCA detection, the same signal is repeatedly sent N times to the terminal device through the second channel, but no ACK is received from the terminal device for the N signals. The adjustment value may be reduced during the K-time CCA detection. N is an integer greater than 1.

When the interference power is less than or equal to the first energy detection threshold and a certain ACK is received from the terminal device, the Kth adjustment value is the K-1th adjustment value. It can be seen that when the second channel is detected to be idle during the K-1 CCA detection, a signal is sent to the terminal device through the second channel, and an ACK for this signal is received from the terminal device, and the K-th CCA detection The adjustment value can be kept unchanged, that is, the adjustment value of the Kth time is kept the same as the adjustment value of the K-1th time.

When the interference power for M consecutive times is greater than the first energy detection threshold, the Kth adjustment value is the sum of the K-1th adjustment value and the adjustment threshold. It can be seen that when the second channel is detected to be busy for M consecutive CCA detections before the Kth time, the adjustment value may be increased during the Kth CCA detection. M is an integer greater than 1.

It should be understood that the above interference power is detected signal energy on the second channel during CCA detection.

It should be understood that the above adjustment threshold may be configured by the IAB host, or may be pre-configured.

It should be understood that the corresponding adjustment thresholds in the above two cases may be the same or different.

It should be understood that the first energy detection threshold is within the first range. When the energy detection threshold determined in the above manner is within the first range, the determined energy detection threshold may be determined as the first energy detection threshold. When the energy detection threshold determined in the above manner is smaller than the minimum value of the first range, the minimum value of the first range may be determined as the first energy detection threshold. When the energy detection threshold determined in the above manner is greater than the maximum value in the first range, the maximum value in the first range may be determined as the first energy detection threshold.

In order to illustrate the impact of the residual self-interference and the adjusted threshold on the throughput of the access link, it can be illustrated through simulation results. Please refer to FIG. 5, which is a schematic diagram of an IAB node access link transmit power and access link throughput disclosed in an embodiment of the present application. As shown in FIG. 5 , the access link throughput without residual self-interference is much greater than that with residual self-interference. The throughput of the access link with the adjusted threshold Δ is higher than the throughput of the access link without the adjusted threshold Δ. Please refer to FIG. 6 . FIG. 6 is a schematic diagram of an adjustment threshold and access link throughput disclosed in an embodiment of the present application. As shown in Figure 6, as the modulation threshold increases, the access link throughput first increases and then remains unchanged. Please refer to FIG. 7 . FIG. 7 is a schematic diagram of another IAB node access link transmission power and access link throughput disclosed in the embodiment of the present application. As shown in FIG. 7 , the access link throughput without residual self-interference is much greater than that with residual self-interference. The throughput of the access link with the adjusted threshold Δ is higher than the throughput of the access link without the adjusted threshold Δ.

It should be understood that Fig. 5 and Fig. 6 show the case of only one optimal initial energy detection threshold for one self-interference channel estimation, and Fig. 7 shows the case of different optimal initial energy detection thresholds for different CCA detections after one self-interference channel estimation.

Next, continue to describe the method shown in FIG. 2 , 203. The IAB node performs CCA detection on the second channel. The IAB node performs CCA detection according to the first CCA monitoring threshold determined in 202 .

204. If the energy on the second channel is less than or equal to the first energy detection threshold, the IAB node sends a signal to the terminal device through the second channel.

After determining the first energy detection threshold, the IAB node may perform CCA detection on the second channel, that is, detect the energy of the signal on the second channel. When it is detected that the energy on the second channel is less than or equal to (or less than) the first energy detection threshold, it indicates that the second channel is idle, and the IAB node can send a signal to the terminal device through the second channel. The spectrum resource used by the IAB node to send a signal is an unlicensed spectrum resource. When it is detected that the energy on the second channel is greater than (or greater than or equal to) the first energy detection threshold, it indicates that the second channel is busy, and the IAB node can wait for the next CCA detection to arrive before performing CCA detection.

Correspondingly, the terminal device can receive the signal sent from the IAB node through the second channel.

It should be understood that the signal sent by the IAB node may be data, information, or an instruction.

It should be understood that the functions performed by the IAB node in the above communication method may also be performed by a module (for example, a chip) in the IAB node, and the functions performed by the terminal device may also be performed by a module (for example, a chip) in the terminal device. .

Based on the foregoing network architecture, please refer to FIG. 8 , which is a schematic structural diagram of a communication device disclosed in an embodiment of the present application. As shown in Figure 8, the communication device may include:

The first determination unit 801 is configured to determine the first range by self-interference channel estimation and self-interference cancellation, the first range is the range of the energy detection threshold for CCA detection, and the self-interference is the interference of the first channel to the second channel, the first The channel is the channel between the IAB node and the IAB host, and the second channel is the channel between the IAB node and the terminal device;

The second determining unit 802 is configured to determine a first energy detection threshold, where the first energy detection threshold is within a first range;

A detection unit 803, configured to perform CCA detection on the second channel;

The sending unit 804 is configured to send a signal to the terminal device through the second channel when the energy on the second channel is less than or equal to the first energy detection threshold.

In one embodiment, the first determining unit 801 is specifically configured to:

The first range is determined based on the second range.

In one embodiment, the first determining unit 801 determining the first range according to the second range includes:

Determine the maximum value of the first range according to the maximum value of the second range, the bandwidth of the first channel and the maximum transmission power of the IAB node.

In one embodiment, the second determination unit 802 is specifically configured to:

determining a second energy detection threshold;

In one embodiment, the second determining unit 802 determining the second energy detection threshold includes:

In one embodiment, the second determining unit 802 is specifically configured to:

In one embodiment, the second determining unit 802 determining the third energy detection threshold according to the time of CCA detection includes:

Determine a third energy detection threshold according to the time of CCA detection and the first range.

In one embodiment, the i-th adjustment values are all the same, i=1, 2, . . . , K.

In one embodiment, when K is greater than 2, when the interference power is less than the first energy detection threshold and no ACK response from the terminal device is received for N consecutive times, the K-th adjustment value is the K-1-th adjustment value and the difference between the adjustment threshold, N is an integer greater than 1;

More detailed descriptions about the first determining unit 801, the second determining unit 802, the detecting unit 803, and the sending unit 804 can be directly obtained by referring to the relevant description of the IAB node in the method embodiment shown in FIG. 2 above, and will not be repeated here. .

Based on the foregoing network architecture, please refer to FIG. 9 , which is a schematic structural diagram of another communication device disclosed in an embodiment of the present application. As shown in FIG. 9 , the communication device may include a processor 901 , a memory 902 , an input interface 903 , an output interface 904 and a bus 905 . The memory 902 may exist independently, and may be connected to the processor 901 through the bus 905 . The memory 902 can also be integrated with the processor 901. Among them, the bus 905 is used to realize the connection between these components.

The communication device may be an IAB node or a module (for example, a chip) in the IAB node. When the computer program instructions stored in the memory 902 are executed, the processor 901 is used to control the sending unit 804 to perform the operations performed in the above embodiments, The processor 901 is also configured to execute the operations performed by the first determining unit 801, the second determining unit 802, and the detecting unit 803 in the above embodiments, and the input interface 903 is configured to receive information from other communication devices other than the communication device, The output interface 904 is configured to perform operations performed by the sending unit 804 in the foregoing embodiments. The above-mentioned IAB node or modules in the IAB node can also be used to execute various methods performed by the IAB node in the above-mentioned method embodiment in FIG. 2 , which will not be repeated here.

Based on the above network architecture, please refer to FIG. 10, which is a schematic structural diagram of another communication device disclosed in an embodiment of the present application. As shown in FIG. 10 , the communication device may include an input interface 1001 , a logic circuit 1002 and an output interface 1003 . The input interface 1001 is connected to the output interface 1003 through a logic circuit 1002 . Wherein, the input interface 1001 is used for receiving information from other communication devices, and the output interface 1003 is used for outputting, scheduling or sending information to other communication devices. The logic circuit 1002 is configured to perform operations other than the operations of the input interface 1001 and the output interface 1003 , such as implementing the functions implemented by the processor 901 in the above-mentioned embodiments. The communication device may be an IAB node or a module of the IAB node. Wherein, more detailed descriptions about the input interface 1001, the logic circuit 1002, and the output interface 1003 can be directly obtained by referring to the relevant description of the IAB node in the above method embodiment, and will not be repeated here.

The embodiment of the present application also discloses a computer-readable storage medium, on which instructions are stored, and when the instructions are executed, the methods in the foregoing method embodiments are executed.

The embodiment of the present application also discloses a computer program product including an instruction, and when the instruction is executed, the method in the above method embodiment is executed.

The embodiment of the present application also discloses a communication system, which includes an IAB host, an IAB node, and a terminal device. For specific description, please refer to the above description.

The specific implementation manners described above have further described the purpose, technical solutions and beneficial effects of the application in detail. It should be understood that the above descriptions are only specific implementation modes of the application and are not intended to limit the scope of the application. Scope of protection: All modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of this application shall be included within the scope of protection of this application.

Claims

A communication method, characterized in that the method is applied to an integrated IAB node for access backhaul, the IAB node is connected to a terminal device through a wireless access link, and the IAB node and an IAB host are connected through a wireless backhaul link connections, including:

The IAB node determines the first range through self-interference channel estimation and self-interference elimination, the first range is the range of the energy detection threshold of the idle channel assessment CCA detection, and the self-interference is the interference of the first channel to the second channel , the first channel is a channel between the IAB node and the IAB host, and the second channel is a channel between the IAB node and the terminal device;

The IAB node determines a first energy detection threshold, the first energy detection threshold is within the first range;

The IAB node performs CCA detection on the second channel;

When the signal energy on the second channel is less than or equal to the first energy detection threshold, the IAB node sends a signal to the terminal device through the second channel.
The method according to claim 1, wherein the IAB node determining the first range through self-interference channel estimation and self-interference cancellation includes:

The IAB node performs self-interference channel estimation to obtain the first interference;

The IAB node performs self-interference cancellation according to the first interference to obtain a second range, where the second range is the remaining self-interference range after self-interference cancellation;

The IAB node determines the first range according to the second range.
The method according to claim 2, wherein the IAB node determining the first range according to the second range includes:

The IAB node determines the minimum value of the first range according to the maximum value of the second range and the bandwidth of the first channel;

The IAB node determines the maximum value of the first range according to the maximum value of the second range, the bandwidth of the first channel, and the maximum transmission power of the IAB node.
The method according to any one of claims 1-3, wherein the IAB node determining the first energy detection threshold comprises:

The IAB node determines a second energy detection threshold;

When the CCA detection is the first CCA detection after the self-interference channel estimation, the IAB node determines the second energy detection threshold as the first energy detection threshold;

When the CCA detection is the Kth CCA detection after the self-interference channel estimation, the IAB node determines the sum of the energy detection threshold of the K-1th CCA detection and the K-1th adjustment value as the first Energy detection threshold, K is an integer greater than 1.
The method according to claim 4, wherein said IAB node determining the second energy detection threshold comprises:

The IAB node determines a second energy detection threshold according to the first range.
The method according to any one of claims 1-3, wherein the IAB node determining the first energy detection threshold comprises:

The IAB node determines a third energy detection threshold according to the time of the CCA detection;

When the CCA detection is the first CCA detection after the self-interference channel estimation, the IAB node determines the third energy detection threshold as the first energy detection threshold;

When the CCA detection is the Kth CCA detection after the self-interference channel estimation, the IAB node determines the sum of the third energy detection threshold and the K-1th adjustment value as the first energy detection Threshold, K is an integer greater than 1.
The method according to claim 6, wherein the IAB node determines the third energy detection threshold according to the time of the CCA detection comprising:

The IAB node determines a third energy detection threshold according to the CCA detection time and the first range.
The method according to any one of claims 4-7, characterized in that the i-th adjustment values are all the same, i=1, 2, . . . , K.
The method according to any one of claims 4-7, wherein when K is greater than 2, when the interference power is less than the first energy detection threshold, and the terminal equipment has not received any When the ACK response is confirmed, the Kth adjustment value is the difference between the K-1th adjustment value and the adjustment threshold, and N is an integer greater than 1;

When the interference power is less than the first energy detection threshold and an ACK response from the terminal device is received, the Kth adjustment value is the K-1th adjustment value;

When the interference power for M consecutive times is greater than the first energy detection threshold, the Kth adjustment value is the sum of the K-1th adjustment value and the adjustment threshold, and M is an integer greater than 1.
A communication device, characterized in that the device is an integrated IAB node for access and backhaul, the IAB node is connected to the terminal equipment through a wireless access link, and the IAB node is connected to the IAB host through a wireless backhaul link , the device includes:

The first determination unit is configured to determine a first range through self-interference channel estimation and self-interference cancellation, the first range is the range of the energy detection threshold of the free channel assessment CCA detection, and the self-interference is the first channel to the second channel interference, the first channel is a channel between the IAB node and the IAB host, and the second channel is a channel between the IAB node and the terminal device;

a second determining unit, configured to determine a first energy detection threshold, where the first energy detection threshold is within the first range;

a detection unit, configured to perform CCA detection on the second channel;

A sending unit, configured to send a signal to the terminal device through the second channel when the energy on the second channel is less than or equal to the first energy detection threshold.
The device according to claim 10, wherein the first determining unit is specifically configured to:

performing self-interference channel estimation to obtain the first interference;

performing self-interference cancellation according to the first interference to obtain a second range, where the second range is the remaining self-interference range after self-interference cancellation;

The first range is determined according to the second range.
The device according to claim 11, wherein the first determining unit determining the first range according to the second range comprises:

determining a minimum value in the first range based on the maximum value in the second range and the bandwidth of the first channel;

Determine the maximum value of the first range according to the maximum value of the second range, the bandwidth of the first channel, and the maximum transmit power of the IAB node.
The device according to any one of claims 10-12, wherein the second determining unit is specifically configured to:

determining a second energy detection threshold;

When the CCA detection is the first CCA detection after the self-interference channel estimation, determining the second energy detection threshold as the first energy detection threshold;

When the CCA detection is the Kth CCA detection after the self-interference channel estimation, the sum of the energy detection threshold of the K-1th CCA detection and the K-1th adjustment value is determined as the first energy detection threshold, K is an integer greater than 1.
The device according to claim 13, wherein the determination by the second determining unit of the second energy detection threshold comprises:

Determine a second energy detection threshold according to the first range.
The device according to any one of claims 10-12, wherein the second determining unit is specifically configured to:

determining a third energy detection threshold according to the time of the CCA detection;

When the CCA detection is the first CCA detection after the self-interference channel estimation, determining the third energy detection threshold as the first energy detection threshold;

When the CCA detection is the Kth CCA detection after the self-interference channel estimation, the sum of the third energy detection threshold and the K-1th adjustment value is determined as the first energy detection threshold, and K is An integer greater than 1.
The device according to claim 15, wherein the second determining unit determining the third energy detection threshold according to the time of the CCA detection comprises:

Determine a third energy detection threshold according to the CCA detection time and the first range.
The device according to any one of claims 13-16, characterized in that the i-th adjustment values are all the same, i=1, 2, . . . , K.
The device according to any one of claims 13-16, wherein when K is greater than 2, when the interference power is less than the first energy detection threshold, and the terminal device has not received any When the ACK response is confirmed, the Kth adjustment value is the difference between the K-1th adjustment value and the adjustment threshold, and N is an integer greater than 1;

When the interference power is less than the first energy detection threshold and an ACK response from the terminal device is received, the Kth adjustment value is the K-1th adjustment value;

When the interference power for M consecutive times is greater than the first energy detection threshold, the Kth adjustment value is the sum of the K-1th adjustment value and the adjustment threshold, and M is an integer greater than 1.
A communication device, characterized in that it includes a processor, a memory, an input interface and an output interface, the input interface is used to receive information from other communication devices other than the communication device, and the output interface is used to send information to the other communication devices other than the communication device to output information, and the processor invokes the computer program stored in the memory to implement the method according to any one of claims 1-9.
A computer-readable storage medium, characterized in that, a computer program or computer instruction is stored in the computer-readable storage medium, and when the computer program or computer instruction is executed, any one of claims 1-9 is realized. the method described.
A chip, characterized by comprising a processor, configured to execute a program stored in a memory, and when the program is executed, the chip executes the method according to any one of claims 1-9.