CN110324910B

CN110324910B - Communication method and communication device

Info

Publication number: CN110324910B
Application number: CN201810289158.3A
Authority: CN
Inventors: 尹久; 蒋成钢; 张兴新; 王学寰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-03-30
Filing date: 2018-03-30
Publication date: 2023-08-22
Anticipated expiration: 2038-03-30
Also published as: CN110324910A; WO2019185010A1

Abstract

The application provides a communication method and a communication device, which can improve the system capacity. The communication method comprises the following steps: determining a starting time slot for transmitting data by a transmission resource which firstly completes LBT interception in a plurality of transmission resources; starting from a first reserved period to an N reserved period after the completion of LBT interception by an ith transmission resource in transmission resources currently completing LBT interception in a plurality of transmission resources, executing the following operations: transmitting a reservation signal on an ith transmission resource during a first time period in a jth reservation period; determining that the channel state of a transmission resource which is not monitored by the LBT at present is busy in a first time period in a first reservation period; under the condition that j is more than 1, determining the channel state of the transmission resource which is not monitored by the LBT currently and not completed in the first time period in the j reservation period; and in a second time period in the j-th reservation period, carrying out channel detection on each transmission resource which is not monitored by the LBT currently.

Description

Communication method and communication device

Technical Field

The present application relates to the field of communications, and more particularly, to a communication method and a communication apparatus.

Background

Unlicensed (unlicensed) systems based on long term evolution (long term evolution, LTE) (hereinafter abbreviated as LTE-U), such as: licensed spectrum assisted access (licensed assisted access, LAA), enhanced licensed spectrum assisted access (enhanced licensed assisted access, eLAA), multeFire systems, the channel access mechanism of which employs listen-before-talk (Listen Before Talk, LBT) mode to distributively coordinate access of multiple systems to unlicensed spectrum, avoid interference between multiple nodes and simultaneously ensure fairness of access. The bandwidth supported by the New Radio (NR) of the fifth generation (5th generation,5G) is greater than 100MHz, and an NR (hereinafter referred to as NR-U) operating in an unlicensed band may also access a channel by using a channel access mechanism such as LAA.

LTE-U may operate over a larger bandwidth by means of carrier aggregation (carrier aggregation, CA). LTE has a maximum bandwidth of 20MHz per carrier, and ca features may aggregate multiple 20MHz carriers, either contiguous or non-contiguous, together to provide a larger bandwidth radio access service for users. The fifth generation (5th generation,5G) new air interface (NR) system increases the maximum bandwidth of the carrier to 400MHz while also supporting transmission over a larger bandwidth formed by the CA feature. The LTE-U/NR-U system employing carrier aggregation may contend for access to unlicensed spectrum using the LBT scheme described above, which is protocol-referred to as Type A with defer for access to the channel. In the Type A with defer channel access mode, the network device independently starts LBT on all 20MHz channels, and waits (defer) if it detects that the channels are idle. And during the waiting period, no data is transmitted, after the interception of a plurality of channels is finished, short interception is carried out again on the channels in the waiting state before transmission, and then LTE-U/NR-U transmission can be carried out on the idle channels.

In the current channel access mode of type A with defer, after the target node rolls back, it is required to wait until the slot boundary or a plurality of channels are rolled back to transmit data, during which the channels may be preempted by other unauthorized nodes, thereby causing the target node to lose the opportunity to transmit data.

Disclosure of Invention

The application provides a communication method and a communication device, which can improve the system capacity.

In a first aspect, a communication method is provided, including:

determining a starting time slot for transmitting data by a transmission resource which is firstly monitored by Listen Before Talk (LBT) in a plurality of transmission resources;

starting from a first reserved period to an N reserved period after LBT interception is completed by an ith transmission resource in the transmission resources which currently complete LBT interception in the plurality of transmission resources, executing the following operations, wherein the duration between the starting time of the N+1th reserved period and the starting time slot is smaller than a preset duration:

transmitting a reservation signal on the ith transmission resource in a first time period in the jth reservation period, and not performing channel detection on each transmission resource of the plurality of transmission resources for which LBT interception is currently not completed in the first time period in the jth reservation period;

determining that the channel state of each transmission resource of the plurality of transmission resources, which is not currently monitored by LBT, is busy in a first time period in the first reservation period;

determining a channel status of each of the plurality of transmission resources for a first period of time in a j-th reservation period for an initial clear channel assessment (clear channel assessment, CCA) detection and/or extended (CCA) detection for each of the plurality of transmission resources for which LBT listening is currently not complete, j > 1;

In a second time period in the j-th reservation period, performing channel detection on each transmission resource of the plurality of transmission resources, which is not currently monitored by LBT, so as to perform the initial CCA detection and/or the extended CCA detection;

wherein i=1, 2, …, M is the total number of transmission resources in the plurality of transmission resources for which LBT interception is currently completed, the first period is adjacent to and does not overlap with the second period, the sum of the first period and the second period is greater than or equal to the sum of the initial CCA detection period duration and the extended CCA detection period duration, and the first period duration is greater than the second period duration, j=1, 2, …, N.

Alternatively, the transmission resource may be a channel, a Radio Frequency (RF) channel, a beam, or a carrier. If the transmission resource is a channel or carrier, the multiple channels or carriers may be used for carrier aggregation.

It should be noted that, if a certain transmission resource completes LBT interception while the sender is transmitting a reservation signal, the sender needs to wait until the next reservation period and then transmit the reservation signal together with other transmission resources completing LBT interception.

In the current channel access mode of type A with defer, after the target node rolls back, it is necessary to wait until the slot boundary or a plurality of channels are all rolled back to transmit data, during which the channels may be preempted by other unauthorized nodes, and the target node loses the opportunity to transmit data. According to the communication method provided by the application, the reserved signal is periodically sent on the transmission resource which completes LBT interception, so that the problem that the transmission resource which completes LBT interception is preempted by other nodes as far as possible, and the problem of reduced channel competitiveness can be improved. In addition, the reserved signal is periodically sent on the transmission resource completing the LBT interception, instead of the reserved signal being sent all the time before the sending time slot (i.e. the starting time slot for sending the data) is not arrived, so that the transmission resource not completing the LBT interception can have an opportunity to make a back-off, further the transmission resource not completing the LBT interception at present is likely to complete the LBT interception before the sending time slot arrives, thus the opportunity that the transmission resource not completing the LBT interception sends the data after the starting time slot arrives can be increased, and further the system capacity is improved.

In one possible implementation manner, the determining the channel state of each transmission resource of the plurality of transmission resources that is not currently monitored by LBT in the first time period in the j-th reservation period includes:

If the channel detection result of the first transmission resource in the second time period in the j-1 th reservation period in each transmission resource which is not monitored by the LBT currently is busy, determining that the channel state of the first transmission resource in the first time period in the j-1 th reservation period is busy;

if the channel detection result of the first transmission resource in the second time period in the j-1 th reservation period in each transmission resource which is not monitored by the LBT currently is idle, determining that the channel state of the first transmission resource in the first time period in the j-1 th reservation period is idle;

wherein the first transmission resource is any one of the transmission resources of which LBT interception is currently not completed in the plurality of transmission resources.

Specifically, if the channel detection result of the first transmission resource in the second time period in the current reservation period is busy, the channel state of the first transmission resource in the first time period in the next reservation period is considered to be busy. And if the detection result of the first transmission resource which is not completed currently and is backed off in the second time period in the current reservation period is idle. The channel state of the first transmission resource in the first period of the next reservation period is considered to be idle. If the channel state is idle, the transmitting end may perform initial CCA detection and/or perform extended CCA detection according to the duration of the first period and the duration of the second period in the previous reservation period.

determining that a channel state of a first transmission resource in each transmission resource of the plurality of transmission resources, which is not currently monitored by LBT, is busy in a first time period in a j-th reservation period;

if the channel detection result of the first transmission resource in the second time period in the j-th reservation period in each transmission resource of the current unfinished LBT interception in the plurality of transmission resources is idle, and the channel detection result in the second time period in the j-1-th reservation period is idle, setting the corresponding rollback random number P at the end time of the j-th reservation period asWherein S1 is the first time period duration, S2 is the first time period duration, T1 is the detection period of the initial CCA, T2 is the extended CCA detection period, and>representing a downward rounding;

Specifically, the transmitting end considers that the channel state of any transmission resource which does not complete LBT interception at present is busy in the first time period in the current reservation period. If the channel detection results of any transmission resource which is not finished currently and is backed off in the second time period in the current reservation period and the second time period in the last reservation period are idle, the back-off random number P is taken as

In one possible implementation, the method further includes:

starting from the end time of the Nth reserved period to the initial time slot, carrying out channel detection on the ith transmission resource;

and if the channel detection result is idle, sending the data to be sent on the ith transmission resource.

According to the communication method provided by the embodiment of the application, the channel detection is carried out before the arrival of the initial time slot, and if the channel detection result is idle, the data is retransmitted, so that the collision with other nodes can be avoided, and the system performance can be improved.

In a second aspect, a communication method is provided, including:

determining a starting time slot for transmitting data of a main channel which completes listen-before-talk (LBT) interception in a plurality of channels;

starting from a first reserved period to an Nth reserved period after the primary channel finishes LBT interception, executing the following operations, wherein the duration between the starting time of the (N+1) th reserved period and the starting time slot is smaller than a preset duration:

transmitting a reservation signal on the primary channel and on at least one first subchannel of the plurality of channels during a first time period in the first reservation period, and not channel-listening to each of the plurality of channels during the first time period in the first reservation period, the first subchannel being idle for a short listening period of a second time period preceding and adjacent to the first time period;

In the case where j > 1, transmitting a reservation signal on the primary channel and on each sub-channel of the plurality of channels for which the short sense is idle in a second period of the j-1 th reservation period in a first period of the j-th reservation period, and not performing channel sense on each of the plurality of channels for which the channel state is busy in the first period of the j-th reservation period;

and in a second time period in the j-th reservation period, carrying out the short interception on each sub-channel with busy channel state in the plurality of channels.

Specifically, after the main channel completes LBT interception, if the time of the main channel completing LBT interception and the time period before the starting time slot are longer than the preset time period, the transmitting end periodically transmits the reserved signal on the main channel and the sub-channel of which the short interception is idle until the time period between the transmitting time of the current reserved signal and the starting time slot is shorter than the preset time period. A period of time before the reservation signal is transmitted and a period of time after the reservation signal is transmitted are used for uplink and downlink switching, and both periods of time may be referred to herein as switching time. The total duration of the switching time and the time of transmitting the reservation signal is the first time period. When the reservation signal is transmitted, channel interception is not performed on the sub-channel of which the current short interception is busy or is not performed on the plurality of channels. And in a second time period after the first time period, performing short interception on the sub-channel with the current short interception being busy. And if the short interception result of a certain sub-channel is idle, transmitting a reservation signal on the sub-channel in the first time period in each subsequent reservation period.

According to the communication method provided by the application, the reserved signals are periodically sent on the main channel which completes LBT interception and the sub-channel which is idle in short interception, so that the problem that the main channel and the sub-channel which is idle in short interception are preempted by other nodes as much as possible, and the problem of reduced channel competitiveness can be improved. In addition, the reserved signal is periodically sent on the main channel and the sub-channel with idle short interception, instead of always sending the reserved signal before the sending time slot (namely, the starting time slot for sending data) is not arrived, so that the sub-channel with busy short interception is accessed, the opportunity of sending data after the starting time slot of the sub-channel with busy short interception is increased, and the system capacity is further improved.

In one possible implementation, the method further includes:

channel listening on at least one second channel from the end of the n+1th reservation period to the start time slot, the at least one second channel comprising the main channel, the at least one first sub-channel, each sub-channel for which the short listening is idle in a second period of time in any one of the nth reservation period and before the nth reservation period;

And if the channel interception result of the main channel in the at least one second channel is idle when the starting time slot arrives, if the channel interception result of any channel except the main channel in the at least one second channel is idle, transmitting data to be transmitted on the main channel and any channel from the starting time slot.

In a third aspect, a communication method is provided, including:

the first communication device determines a starting time slot for transmitting data after finishing Listen Before Talk (LBT) interception;

the first communication device starts from a first reserved period to an nth reserved period after LBT interception is completed, and executes the following operations, wherein the duration between the starting time of the (n+1) th reserved period and the starting time slot is smaller than a preset duration:

the first communication device transmits a reservation signal during a first period of a j-th reservation period and does not perform channel detection during a second period of the j-th reservation period, j=1, 2, …, N.

Specifically, after the first communication device completes LBT interception, the time when the main channel completes LBT interception and the time before the starting time slot are longer than a preset time length, and the first communication device periodically transmits the reserved signal until the time length between the transmission time of the current reserved signal and the starting time slot is smaller than the preset time length. A period of time before the reservation signal is transmitted and a period of time after the reservation signal is transmitted are used for uplink and downlink switching, and both periods of time may be referred to herein as switching time. The total duration of the switching time and the time of transmitting the reservation signal is the first time period. When the second communication device has data to be transmitted, channel access is needed through LBT interception. When the second communication device performs channel detection, if the detected signal is a known reserved signal, the channel state is considered to be idle, and if the detected signal is an unknown signal, the channel state is considered to be busy. And the transmitting end continues to perform initial CCA detection or extended CCA detection according to the channel state.

According to the communication method provided by the application, after the first communication equipment completes LBT interception, the reserved signal is periodically sent, so that the channel resource can be prevented from being preempted by other nodes as much as possible, and the problem of reduced channel competition capability can be improved. In addition, when the second communication device detects the channel, the channel state when the known reserved signal is detected is regarded as idle, so that the opportunity of the second communication device to transmit data after the arrival of the initial time slot can be increased, and the system capacity can be further improved.

In one possible implementation, the method may further include:

the first communication equipment starts from the end time of the N reserved period to the initial time slot to perform channel detection;

and if the channel detection result is idle, the first communication equipment starts to send data to be sent from the initial time slot.

Specifically, if the duration between the starting time of the n+1th reservation period and the starting time slot is less than or equal to the preset duration, the first communication device performs channel interception from the starting of the n+1th reservation period to the starting time slot. If the channel listening result is idle, the first communication device may transmit data to be transmitted from the starting time slot.

In a fourth aspect, a communication method is provided, including:

the second communication equipment performs channel detection;

if the signal detected by the second communication equipment is a reserved signal, determining that the channel state of the transmission duration of the reserved signal is idle;

And the second communication equipment performs Listen Before Talk (LBT) interception according to the channel state.

According to the communication method provided by the application, the channel state when the second communication device detects the known reserved signal is regarded as idle when the second communication device detects the channel, so that the opportunity of the second communication device to send data after the starting time slot arrives can be increased, and the system capacity is further improved.

The methods provided by the above aspects also include various implementations described below. The preset time length is 2 times of the reserved period time length.

In one possible implementation, the first time period duration and the second time period duration are determined according to a priority of data to be transmitted.

It should be appreciated that the first time period includes a transmit reservation signal duration and a switch duration. The reservation signal duration is the length of time that the reservation signal is transmitted. And in the switching time period, the transmitting end does not perform any operation, namely does not transmit data and does not receive data. It should be understood that, when the transmitting end transmits the reservation signal in the first period, the transmitting end transmits the reservation signal only in the first period for transmitting the reservation signal, and does not transmit the reservation signal in the switching time.

In one possible implementation, the reserved signal duration may be 12us, the first period of time being 27us and the second period of time being 18us. That is, the reservation period is 45us.

In one possible implementation, the reservation signal may be a short training field (short training filed, STF) signal to facilitate detection of the signal by the WIFI node. The duration of the reservation signal may be the duration of 15 STF signals. Wherein the duration of each STF signal is 0.8us.

In a fifth aspect, a communication device is provided for performing the method of the first to fourth aspects or any possible implementation of the first to fourth aspects.

In a sixth aspect, the present application provides a communication device comprising: a memory, a processor and a transceiver, the memory storing thereon a computer program executable on the processor, the processor executing the computer program performing the method of the first to fourth aspects or any possible implementation of the first to fourth aspects.

In a seventh aspect, the present application provides a communication device comprising: a memory, a processor and a transceiver, the memory storing a computer program executable on the processor, the processor executing the computer program to perform the method of the first aspect to the fourth aspect or any possible implementation manner of the first aspect to the fourth aspect.

In an eighth aspect, the present application provides a computer readable medium storing a computer program comprising instructions for performing the above aspects or methods in any of the possible implementations of the above aspects.

In a ninth aspect, the application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of each of the above aspects or any of the possible implementations of each of the above aspects.

In a tenth aspect, the present application provides a chip comprising: the system comprises an input interface, an output interface, at least one processor and a memory, wherein the input interface, the output interface, the processor and the memory are communicated with each other through an internal connection path, the processor is used for executing codes in the memory, and when the codes are executed, the processor is used for executing the method in each aspect or any possible implementation manner of each aspect.

Drawings

Fig. 1 is a schematic diagram of an LBT procedure.

Fig. 2 is a schematic diagram of a Type A with defer channel access mode.

Fig. 3 is a schematic diagram of a communication system suitable for use in the communication method of an embodiment of the present application.

Fig. 4 is a schematic diagram of a communication system suitable for use in the communication method of an embodiment of the present application.

Fig. 5 is a schematic diagram of a communication system suitable for use in the communication method of an embodiment of the present application.

Fig. 6 is a schematic flow chart of a communication method according to an embodiment of the application.

Fig. 7 is a schematic diagram of a reservation period.

Fig. 8 is a schematic diagram of a communication method implementing one embodiment of the application.

Fig. 9 is a schematic diagram of a communication method implementing one embodiment of the application.

Fig. 10 is a schematic diagram of a communication method implementing one embodiment of the application.

Fig. 11 is a schematic flow chart of another communication method provided in accordance with the present application.

Fig. 12 is a schematic diagram of a communication method implementing one embodiment of the application.

FIG. 13 is a schematic flow chart of a communication method according to another embodiment of the application

Fig. 14 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 15 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 16 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Fig. 17 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical scheme of the application will be described below with reference to the accompanying drawings.

LBT is a channel access mechanism that enables LTE networks to coexist with other networks, fairly competing for unlicensed spectrum resources. Since the availability of channels on unlicensed bands cannot be guaranteed at any time, LBT requires that the channels be monitored before transmitting data, clear channel assessment (clear channel assessment, CCA) is performed, and data transmission is performed again with the channels guaranteed to be clear.

The 3GPP adopts an LBT mechanism (i.e., category 4) of an adaptive backoff window based on load (load based) as a basis for a channel access mechanism of LAA downlink. A schematic LBT mechanism flow diagram of the load-based adaptive backoff window is shown in fig. 1, and the LBT flow is described as follows:

(1) If the LAA base station has data to send, a random back-off number P is generated.

(2) The LAA base station performs an initial CCA detection with a detection period of T1, for example, 34us (same DIFS as WIFI). If the channel is detected to be idle in the time T1, jumping to the next step, otherwise, continuing to perform initial CCA detection.

(3) The extended channel idle assessment (extended clear channel assessment, ECCA) detection, i.e. the channel backoff stage is entered, with a detection period T2, for example, 9us (same time slot as WIFI) may be taken. If the channel is detected to be idle in the time T2, jumping to the next step, otherwise, returning to the step (2).

It will be appreciated that if it is detected that the channel is busy (or not idle) at time T2, channel detection is required at the next time T1. If the channel is detected to be still busy at the time T1 after the time T2, the channel detection is performed at the next time T1 until the time T1 detects that the channel is idle, and then the ECCA process is continued.

(4) Subtracting P from 1, if P is reduced to 0, completing LBT interception or finishing rollback, jumping to the next step; otherwise, returning to the step (3).

(5) Judging whether the time slot is a time slot boundary, if not, waiting; if so, data may be sent.

It should be understood that "slot boundary" in the embodiment of the present application refers to a slot boundary used for transmitting data, for example, may be a field boundary, which is not limited by the embodiment of the present application.

Currently, an LTE-U/NR-U system adopting carrier aggregation can access unlicensed spectrum through a mechanism of Type A with defer. In the Type A with defer channel access scheme, LBT is independently started on each 20MHz channel of carrier aggregation. If the time when the channel completes the backoff is not a slot boundary, a wait (transfer) is performed during which no data is transmitted. Waiting until a plurality of channels finish rollback, and carrying out short interception on the channels in a waiting state again before the arrival of the time slot boundary, wherein the channels with the short interception being idle can be used for LTE-U/NR-U transmission.

For example, as shown in fig. 2, before a target node in the system accesses a channel by way of Type A with defer channel access, channel interception must be performed on channel a and channel B. The backoff random number of channel a is 8, the target node detects that channel a is idle at time T1 and detects that channel a is idle for the next 8T 2 times. The rollback random number of the channel B is 3, and after the target node detects that the channel B is idle in the time of T1, the target node detects that the channel B is idle in the following 3 time of T2. Channel B waits after completing channel backoff, does nothing during the waiting period, and at slot boundary t ₀ Short interception is performed before the moment comes. Since channel A is at t ₀ LBT interception or rollback is completed before the moment comes, if the short interception result of the channel B is idle, the target node sends a message from t ₀ Data may be initially transmitted on channel a and channel B.

In the current channel access mode of type A with defer, after the target node rolls back, it is necessary to wait until the slot boundary or a plurality of channels are all rolled back to transmit data, during which the channels may be preempted by other unauthorized nodes, and the target node loses the opportunity to transmit data. For example, as shown in FIG. 2, if channel B is at slot boundary t ₀ The result of the short interception before the arrival of the moment is busy, the target node will lose the opportunity to send data on channel B.

In view of this, the present application provides a communication method, which can avoid the problem that the transmission resource completing LBT interception is preempted by other nodes as much as possible by periodically transmitting a reservation signal on the transmission resource completing LBT interception, thereby improving the problem of reduced channel contention capability. In addition, the reserved signal is periodically sent on the transmission resource completing the LBT interception, instead of the reserved signal being sent all the time before the sending time slot (i.e. the starting time slot for sending the data) is not arrived, so that the transmission resource not completing the LBT interception can have an opportunity to make a back-off, further the transmission resource not completing the LBT interception at present is likely to complete the LBT interception before the sending time slot arrives, thus the opportunity that the transmission resource not completing the LBT interception sends the data after the starting time slot arrives can be increased, and further the system capacity is improved.

The technical scheme of the embodiment of the application can be applied to various communication systems, such as: global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication system, future fifth generation (5th generation,5G) system, or New Radio (NR), etc.

The terminal device in the embodiments of the present application may refer to a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device may also be a cellular telephone, a cordless telephone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved public land mobile network (public land mobile network, PLMN), etc., as embodiments of the present application are not limited in this regard.

The network device in the embodiment of the present application may be a device for communicating with a terminal device, where the network device may be a base station (base transceiver station, BTS) in a global system for mobile communications (global system of mobile communication, GSM) or code division multiple access (code division multiple access, CDMA), a base station (nodeB, NB) in a wideband code division multiple access (wideband code division multiple access, WCDMA) system, an evolved base station (evolutional nodeB, eNB or eNodeB) in an LTE system, a wireless controller in a cloud wireless access network (cloud radio access network, CRAN) scenario, or the network device may be a relay station, an access point, a vehicle device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network, etc., and the embodiment of the present application is not limited.

To facilitate an understanding of embodiments of the present application, a communication system suitable for use in embodiments of the present application will be briefly described with reference to fig. 3-5. It should be understood that the network devices or terminal devices in fig. 3-5 operate in unlicensed bands.

Fig. 3 is a schematic diagram of a communication system 100 suitable for use in the communication method of an embodiment of the present application. As shown in fig. 3, the communication system 100 includes at least two communication devices, for example, a network device 110 and a terminal device 120, wherein data communication between the network device 110 and the terminal device 120 may be performed through a wireless connection. When the network device 110 needs to send data to the terminal device 120, the network device 110 may perform channel access through the communication method according to the embodiment of the present application.

Fig. 4 is a schematic diagram of a communication system 200 suitable for use in the communication method of an embodiment of the present application. As shown in fig. 4, the communication system 200 includes at least two communication devices, for example, a terminal device 130 and a terminal device 140, wherein the terminal device 130 and the terminal device 140 can perform data communication in a device-to-device (D2D) communication manner.

Fig. 5 is a schematic diagram of a communication system 300 suitable for use in the communication method of an embodiment of the present application. As shown in fig. 5, the communication system 300 includes at least two communication devices, e.g., network device 150 and network device 160, wherein the network device 150 and network device 160 are in data communication via a backhaul link.

It should be understood that more network nodes, such as terminal devices or network devices, may be included in each of the communication systems shown in fig. 3-5, and embodiments of the present application are not shown in the figures.

In order that those skilled in the art may better understand the present application, a brief description of related concepts or terms will be provided below.

(1) Channel interception

Channel sensing may also be referred to as channel detection.

Channel detection or channel listening, i.e. CCA detection, is performed. The CCA detection time may be 4us. If the channel detection result of 4us is idle, then in the next 5us, the channel state is also idle. It should be appreciated that embodiments of the present application are not limited to CCA detection durations. Generally, the CCA detection method is that the target node weights the power values of all the received interfering nodes to obtain an interference value, and compares the interference value with a preset interference threshold value, if the value is greater than the threshold value, the state of the channel is busy at this time, otherwise, the state of the channel is idle at this time. However, the embodiment of the present application is not limited to the CCA detection method, and the CCA detection method may refer to the prior art, and will not be described herein.

(2) Short interception and full interception

Short interception is relative to full interception. The short interception may be, for example, interception of two 9us or interception of 3 9us, which is not limited by the embodiment of the present application. The full interception may be, for example, interception of 5 9us or interception of 10 9us, which is not limited by the embodiment of the present application.

Short interception of X duration: refers to channel listening for a duration X.

Short interception of Y duration: refers to channel listening for a period Y. Typically Y > X.

Hereinafter, a communication method provided by the present application will be described with reference to fig. 6 to 10.

Fig. 6 is a schematic flow chart of a communication method according to an embodiment of the application. In the method shown in fig. 6, transmission resources are channel-accessed according to the LBT mechanism shown in fig. 1. It should be understood that the transmitting end in the method shown in fig. 6 may be the network device 110 in the system 100 shown in fig. 3, or any terminal device in the system 200 shown in fig. 4, or any network device in the system 300 shown in fig. 5.

S610, determining a starting time slot for transmitting data by a transmission resource for which LBT interception is first completed among a plurality of transmission resources.

After the transmission resource completes LBT interception, it is necessary to wait until the slot boundary to transmit data. In the present application, it is necessary to determine the slot boundary of the transmission resource, i.e., the starting slot, of the plurality of transmission resources, for which LBT interception is first completed. It should be appreciated that at the arrival of the initial time slot, if the resource status of the transmission resource that completes LBT interception first is idle, then data may be sent on the transmission resource that completes LBT interception first. If any one of the transmission resources except the transmission resource that completes LBT interception first completes backoff before the arrival of the initial time slot, and the resource status of the any one transmission resource is also idle when the arrival of the initial time slot, then data can also be sent on the any one transmission resource.

And S620, starting from a first reservation period to an N reservation period after the completion of LBT interception by an ith transmission resource in the transmission resources currently completing LBT interception in the plurality of transmission resources, and executing the following first reservation operation.

The duration between the starting time of the (n+1) th reservation period and the starting time slot is smaller than the preset duration. i=1, 2, …, M is the total number of transmission resources currently completing LBT interception.

That is, for any one of the plurality of transmission resources, as long as the transmission resource completes LBT interception, a first reservation operation is performed from a time point when the transmission resource completes LBT interception until a time period between a start time point of a current reservation period and the start time slot is less than a preset time period.

The first reservation operation specifically includes: a reservation signal is transmitted on the ith transmission resource during a first period of a jth reservation period, and channel detection is not performed for each of the plurality of transmission resources for which LBT listening is currently not complete during the first period of the jth reservation period. The channel state of each transmission resource of the current outstanding LBT interception in the first time period in the first reservation period is determined to be busy. In case j > 1, determining a channel state of each transmission resource of the current outstanding LBT listening in a first period of a j-th reservation period for initial CCA detection and/or extended CCA detection. And in a second time period in the j-th reservation period, performing channel detection on each transmission resource which is not currently monitored by the LBT in the plurality of transmission resources so as to perform initial CCA detection and/or extended CCA detection. Where i=1, 2, …, M is the total number of transmission resources currently completing LBT interception, the first period is adjacent to and does not overlap with the second period, the sum of the first period and the second period is greater than or equal to the sum of the duration of the initial CCA detection period T1 and the duration of the extended CCA detection period T2, and the first period is longer than the second period in duration, j=1, 2, …, N.

Specifically, for each transmission resource completing LBT interception, if the transmission resource ((denoted as transmission resource #r) is larger than a preset time period from the time when the LBT interception is completed to the time before the start time slot, the transmission resource #r periodically transmits a reservation signal until the time period between the time when the transmission of the current reservation signal is completed and the start time slot is smaller than the preset time period. And performing initial CCA detection and/or extended CCA detection on each transmission resource which does not complete LBT interception currently in the plurality of transmission resources until the transmission resource which does not complete LBT interception currently completes LBT interception or until the duration between the starting time of the reservation period and the starting time slot is smaller than the preset duration.

Here, performing initial CCA detection and/or extended CCA detection according to the determined channel status in the first period of each reservation period, and not transmitting any signal on the transmission resource #r in the second period of each reservation period, and performing initial CCA detection and/or extended CCA detection on each transmission resource currently not completing LBT interception among the plurality of transmission resources means: the transmitting end does not actually perform channel detection as a transmission resource of incomplete LBT interception in the first period, but sets a state of the transmission resource of incomplete LBT interception at the end of the first period according to the channel state of the transmission resource of incomplete LBT interception considered by the transmitting end in the first period. For example, if the transmitting end considers that the channel state of the transmission resource of the incomplete LBT interception in the first period is idle, and the duration of the first period is 27us, the state of the end time of the first period on the transmission resource of the incomplete LBT interception is: the first 27us channels are idle. If the duration of the second period is 18us, the initial CCA detection period T1 is 34us, the extended CCA detection period T2 is 9us, and if the channel detection result of the first 7us of the second period adjacent to the first period is idle, starting from the 8 th us of the second period, the transmission resource of the incomplete LBT interception enters the extended CCA detection stage, and if the channel detection result on the transmission resource of the incomplete LBT interception is idle in the last 11us of the second period, the backoff random number of the transmission resource of the incomplete LBT interception is subtracted by 1.

It should be understood that, when the transmitting end transmits the reservation signal in the first period, and does not transmit the reservation signal in the switching time.

According to the communication method provided by the application, the reserved signal is periodically sent on the transmission resource which completes LBT interception, so that the problem that the transmission resource which completes LBT interception is preempted by other nodes as far as possible, and the problem of reduced channel competitiveness can be improved. In addition, the reserved signal is periodically sent on the transmission resource completing the LBT interception, instead of the reserved signal being sent all the time before the sending time slot (i.e. the starting time slot for sending the data) is not arrived, so that the transmission resource not completing the LBT interception can have an opportunity to make a back-off, further the transmission resource not completing the LBT interception at present is likely to complete the LBT interception before the sending time slot arrives, thus the opportunity that the transmission resource not completing the LBT interception sends the data after the starting time slot arrives can be increased, and further the system capacity is improved.

Optionally, the first time period duration and the second time period duration are determined according to a priority of the data to be transmitted.

For example, referring to fig. 7, the transmission time of the reservation signal is 12us, the duration of the first period is 27us, and the duration of the second period is 18us. That is, the reservation period is 45us.

Alternatively, the reservation signal in the present application may be a short training field (short training filed, STF) signal, so that the WIFI node detects the signal. The duration of the reservation signal may be the duration of 15 STF signals. Wherein the duration of each STF signal is 0.8us.

By way of example and not limitation, some of the first reservation operations in S620: if j > 1, determining a channel state of each transmission resource of the current unfinished LBT interception in the plurality of transmission resources in a first time period in a j-th reservation period to perform initial clear channel assessment CCA detection and/or extended CCA detection, which may be specifically one or two of the following modes.

Mode one

And under the condition that j is more than 1, if the channel detection result of the first transmission resource in each transmission resource which is not monitored by the LBT currently and not completed in the plurality of transmission resources in the second time period of the j-1 th reservation period is busy, determining that the channel state of the first transmission resource in the first time period of the j-1 th reservation period is busy. If the channel detection result of the first transmission resource in the second time period of the j-1 reservation period is idle, determining that the channel state of the first transmission resource in the first time period of the j reservation period is idle. The first transmission resource is any one of transmission resources of which LBT interception is not currently completed in the plurality of transmission resources.

For example, referring to fig. 8, the transmitting end transmits a signal in a first period of each reservation period on the transmission resources where LBT interception is completed, and performs channel detection in a second period of each reservation period on the transmission resources where LBT is not completed. In a first time period in the first reservation period, the transmitting end transmits reservation signals on the transmission resources which complete the LBT, and the transmitting end considers that the channel state of the transmission resources which do not complete the LBT in the first time period is busy due to transmission resource leakage and the like. And in a second time period in the first reservation period, the transmitting end carries out channel detection on the transmission resources which are not monitored by the LBT. And the sending end considers that the channel state of the transmission resource which is not monitored by the LBT in the first time period in the second reservation period is also busy because the channel detection result is busy. And if the channel detection result of the transmission resource which is not monitored by the LBT in the second time period in the second reservation period is idle, the channel state of the transmission resource which is not monitored by the LBT in the first time period in the third reservation period is considered to be idle. And if the channel detection result of the transmission resource which is not monitored by the LBT is idle in the second time period in the third reservation period, the channel state of the transmission resource which is not monitored by the LBT in the first time period in the fourth reservation period is considered to be idle.

In combination with the reservation period shown in fig. 7, if the initial CCA detection period T1 is 34us and the extended CCA detection period T2 is 9us, in fig. 8, the transmission resources not completed with LBT interception totally detect 45us channel idle in the second period of time in the second reservation period and the first period of time in the third reservation period, so that extended CCA detection can be entered, and after the first period of time in the third reservation period ends, the backoff random number of the transmission resources not completed with LBT interception is subtracted by 1, and since the channel state in the second period of time is also idle, the transmission resources not completed with LBT interception can continue to backoff. For the operation of incomplete LBT interception in subsequent reservation periods, reference may be made to the reservation rules described in way one. If the transmission resource of the incomplete LBT interception can complete the LBT interception when the duration between the starting time of the current reservation period and the starting time slot is greater than the preset duration, the transmission resource of the incomplete LBT interception and the transmission resource of the complete incomplete LBT interception periodically transmit a reservation signal.

Mode two

And if j > 1, determining that the channel state of the first transmission resource in each transmission resource which is not monitored by the LBT currently and incompletely is busy in the first time period in the j-th reservation period. If the channel detection result of the first transmission resource in the second time period of the jth reservation period is idle and the channel detection result in the second time period of the jth-1 reservation period is idle, setting the corresponding rollback random number P at the end time of the jth reservation period as Wherein S1 is the first time period duration, S2 is the first time period duration, T1 is the detection period of the initial CCA, T2 is the extended CCA detection period, < ->Representing a rounding down. The first transmission resource is any one of transmission resources of which LBT interception is not currently completed in the plurality of transmission resources.

For example, referring to fig. 9, the transmitting end transmits a signal in a first period of each reservation period on the transmission resources where LBT interception is completed, and performs channel detection in a second period of each reservation period on the transmission resources where LBT is not completed. In the first time period in each reservation period, the transmitting end transmits reservation signals on the transmission resources with LBT completed, and considers that the transmission resources with LBT not completed are reserved in eachThe channel state during the first period of the cycle is busy. And in a second time period in the first reservation period, the transmitting end carries out channel detection on the transmission resources which are not monitored by the LBT, the channel detection result is that the transmission resources which are not monitored by the LBT are busy, and the transmission resources which are not monitored by the LBT can not be retracted or can not be retracted continuously. The channel detection result of the transmission end on the transmission resource which is not monitored by the LBT in the second time period in the second reservation period and the second time period in the third reservation period is idle, and then the back-off time-dependent number is set as when the second time period in the third reservation period is ended

In connection with the reservation period shown in fig. 7, if the initial CCA detection period T1 is 34us, the extended CCA detection period T2 is 9us, and in fig. 9, it is assumed that the backoff random number of the transmission resource for which LBT listening is not completed at the start time of the first period of the first reservation period is P. Since the channel detection result of the transmission resource of the unfinished LBT interception in the first reservation period is busy, the initial CCA detection is continued from the second reservation period. Although the channel detection result of the second period in the second reservation period is idle, since the duration of the second period is 18us and the channel state of the first period in the third reservation period is busy, the backoff random number of the transmission resource for which LBT interception is not completed at the time when the first period in the third reservation period ends is still P. Since the channel detection result of the transmission resource for which the LBT interception is not completed in the second period of the second reservation period and the second period of the third reservation period is idle, the channel idle state of the duration of the first period can be added so as to make the back-off time-dependent number P as at the end of the second period of the third reservation period Namely P-1.

Optionally, the method may further include:

and if the channel detection result is idle, starting from the initial time slot, transmitting data to be transmitted on the ith transmission resource.

As shown in fig. 10, if the duration from the end time of the second time period to the start time slot in the illustration is equal to the preset duration, channel detection is performed on the transmission resource a completing LBT interception and the transmission resource B completing LBT interception from the end time of the second time period until the start time slot arrives. If the channel detection results of the transmission resource a completing LBT interception and the transmission resource B completing LBT interception are idle in the period from the end time of the second period to the start time, the transmitting end may transmit the data to be transmitted on the transmission resource a completing LBT interception and the transmission resource B completing LBT interception from the start time slot. If the channel detection result of the transmission resource a completing LBT interception is busy before the arrival of the initial time slot, the transmitting end needs to re-perform LBT interception to compete for the transmission resource a.

Further, the preset duration is equal to 2 times of the reserved period duration. For example, when the reservation period is 45us, the preset duration may be 90us.

Fig. 11 is a schematic flow chart of another communication method provided in accordance with the present application. In the communication method shown in fig. 11, a transmitting end uses an LAA Type B LBT mechanism to perform channel access. The transmitting end in the method shown in fig. 11 may be the network device 110 in the system 100 shown in fig. 3, or any terminal device in the system 200 shown in fig. 4, or any network device in the system 300 shown in fig. 5.

S1110, determining a starting time slot for transmitting data of a primary channel for which LBT interception is completed among a plurality of channels.

S1120, starting from the first reservation period to the nth reservation period after the completion of LBT interception by the primary channel, performing the following second reservation operation. The duration between the starting time of the (n+1) th reservation period and the starting time slot is smaller than the preset duration.

The second reservation operation specifically includes: transmitting a reservation signal on a primary channel and on at least one first subchannel of a plurality of channels during a first period of a first reservation period, and not channel listening to each of the plurality of channels during the first period of the first reservation period, the first subchannel being idle for a short listening period of a second period of time preceding and adjacent to the first period of time. In case j > 1, a reservation signal is transmitted on the primary channel and on each sub-channel of the plurality of channels that is idle for short interception in a second period of the j-1 th reservation period in a first period of the j-th reservation period, and channel interception is not performed on each of the plurality of channels that is busy for channel state in the first period of the j-th reservation period. And in a second time period in the j-th reservation period, short interception is carried out on each sub-channel with busy channel state in the plurality of channels.

For example, referring to fig. 12, after the primary channel a completes LBT interception, if the time period between the time when the primary channel a completes LBT interception and the time before the starting time slot is longer than the preset time period, the transmitting end transmits the reserved signal on the primary channel a in the first time period in each reserved period until the time period between the transmitting time of the current reserved signal and the starting time slot is shorter than the preset time period. For example, if the duration between the ending time and the starting time slot of the third reservation period is equal to the preset duration, the reservation signal is not continuously transmitted, which is equivalent to n=3. Since the short interception result of the sub-channel B is idle before the LBT interception is completed before the main channel a, the reservation signal can be transmitted on the sub-channel B also when the reservation signal is transmitted on the main channel a from the moment when the main channel a completes the LBT interception. Since the short interception result of the sub-channels C and D is busy before the LBT interception is completed before the main channel a, channel interception is not performed on the sub-channels C and D for the first period of each reservation period. In addition, channel interception may not be performed on the primary channel a and the sub-channel B during the first period of each reservation period. And if the short interception result on the sub-channels C and D is busy in the second time period in the first reservation period, continuing to perform short interception on the sub-channels C and D in the second time period in the second reservation period. In the second time period in the second reservation period, the short interception result on the sub-channel C is idle, so that in the first time period in the third reservation period, the transmitting end transmits the reservation signal on the sub-channel C when transmitting the reservation signal on the main channel a and the sub-channel B. And in the second time period in the second reservation period, the short interception result on the sub-channel C is busy, and in the second time period in the third reservation period, the short interception on the sub-channel D is continued. If the time period between the end of the third reservation period and the time period before the start time slot is longer than the preset time period, the following operations on each channel may refer to the rule.

It should be understood that, when the transmitting end transmits the reservation signal in the first period, the transmitting end transmits the reservation signal only in the first period for transmitting the reservation signal, and does not transmit the reservation signal in the switching time.

Optionally, the first time period duration and the second time period duration are determined according to a priority of the data to be transmitted. For example, the form of the reservation period may be as shown in fig. 7, and reference may be made to the description of fig. 7 above, which is not repeated here.

Optionally, the method may further include:

and starting from the end time of the (n+1) th reservation period to the starting time slot, and performing channel interception on at least one second channel. The at least one second channel comprises a main channel, at least one first sub-channel, each sub-channel with idle short interception in a second time period in an N reservation period and any reservation period before the N reservation period;

and if the channel interception result of any channel except the main channel in the at least one second channel is idle, starting from the initial time slot, transmitting data to be transmitted on the main channel and any channel.

Specifically, if the duration between the starting time of the n+1th reservation period and the starting time slot is less than or equal to the preset duration, starting from the n+1th reservation period to the starting time slot, the transmitting end performs channel interception on the main channel and each sub-channel which is previously short intercepted as idle. If the channel interception result of the main channel is idle and the channel interception result of the sub-channel is busy, the transmitting end can transmit the data to be transmitted on the main channel from the initial time slot. If the channel interception result of the main channel is idle, the channel interception result of a certain sub-channel is also idle, and then the sending end can transmit the data to be sent together with the sub-channel on the main channel from the initial time slot. If the channel interception result of the main channel is busy, the transmitting end needs to re-compete the main channel no matter whether the channel interception result of the sub-channel is idle or not. For example, n=3, see fig. 12, and after the N-th reservation period ends, the transmitting end performs channel interception on the main channel a, the sub-channels B and C. If the channel interception result of the main channel a is idle from the end time of the nth reserved period to the start time slot, the transmitting end can transmit the data to be transmitted on the main channel a from the start time slot. If the interception result of the sub-channel B or C is also idle, the transmitting end may transmit the data to be transmitted together on the main channel a and the upper sub-channel B or C. If the channel interception result of the main channel A is busy, the main channel needs to be re-contended.

Fig. 13 is a schematic flow chart of a communication method according to another embodiment of the application. The first communication device and the second communication device in the method shown in fig. 13 may be network devices 150 and 160, respectively, in the system 300 shown in fig. 5. In the communication method shown in fig. 13, the second communication device performs channel access using the LBT mechanism shown in fig. 1.

S1310, the first communication device determines a starting slot for transmitting data after completing LBT interception.

S1320, the first communication device starts from the first reservation period after completing LBT interception to the nth reservation period, and performs a third reservation operation as described below.

The duration between the starting time of the (n+1) th reservation period and the starting time slot is smaller than the preset duration.

The third reservation operation specifically includes: the reservation signal is transmitted during a first period of a j-th reservation period, and no channel detection is performed during a second period of the j-th reservation period, j=1, 2, …, N.

S1330, the second communication device performs channel detection.

S1340, if the signal detected by the second communication device is the reserved signal, determining that the channel state of the reserved signal transmission duration is idle.

And S1350, the second communication equipment performs LBT interception according to the channel state.

Optionally, the method may further include:

The method provided by the embodiment of the application is described in detail above with reference to fig. 1 to 13. The following describes in detail the apparatus provided in the embodiment of the present application with reference to fig. 14 to 17.

Fig. 14 is a schematic block diagram of a communication device 1400 provided by an embodiment of the present application. As shown in fig. 14, the communication device 1400 may include: a processing unit 1410.

In one possible implementation, the processing unit 1410 is configured to: determining a starting time slot for transmitting data by a transmission resource which is firstly monitored by Listen Before Talk (LBT) in a plurality of transmission resources;

if j > 1, determining a channel state of each transmission resource of the plurality of transmission resources, which is not monitored by the LBT currently, in a first time period in a j-th reservation period, so as to perform initial idle channel assessment (CCA) detection and/or extended CCA detection;

In one possible implementation, the processing unit 1410 is configured to: determining a starting time slot for transmitting data of a main channel which completes listen-before-talk (LBT) interception in a plurality of channels;

In one possible implementation, the processing unit 1410 is configured to:

after completing listen before talk, LBT, listening, determining a starting time slot for transmitting data;

starting from the first reservation period to the N reservation period after LBT interception is completed, executing the following operations, wherein the duration between the starting time of the N+1th reservation period and the starting time slot is smaller than the preset duration:

In one possible implementation, the processing unit 1410 is configured to:

for channel detection;

and performing listen-before-talk (LBT) interception according to the channel state.

It should be understood that the communication device 1400 may correspond to a transmitting end, a first communication device, or a second communication device in the communication method of the above embodiment of the present application, the communication device 1400 may include units for performing the method performed by the respective performing bodies in the above embodiment of the present application, and each unit and the other operations and/or functions in the communication device 1400 are respectively for implementing the respective flows of the communication method of the above embodiment of the present application, and specific processes of each unit performing the respective steps in the communication method of the above embodiment have been described in detail in the communication method of the above embodiment, and are not repeated herein for brevity.

Fig. 15 shows a communication device 1500 provided by an embodiment of the application. The communication device may include a processor 1510, a transceiver 1520, and a memory 1530, the processor 1510, transceiver 1520, and memory 1530 communicating with each other through an internal connection path. The relevant functions performed by the processing unit above may be performed by the processor 1510, and the transmitting or receiving operations performed by the processing unit may be performed by the processor 1510 controlling the transceiver 1520.

The processor 1510 may include one or more processors, including, for example, one or more CPUs, which in the case of a single CPU, may be a single core CPU or a multi-core CPU.

The transceiver 1520 is configured to transmit and receive data and/or signals, as well as to receive data and/or signals. The transceiver may include a transmitter for transmitting data and/or signals and a receiver for receiving data and/or signals.

The memory 1530 includes, but is not limited to, RAM, ROM, EPROM, CD-ROM, which memory 1530 is used for storing related instructions and data.

The memory 1530 is used for storing program codes and data for the network device and may be a separate device or integrated in the processor 1510.

In particular, the processor 1510 is configured to control the transceiver to communicate information with another communication device. Reference may be made specifically to the description of the method embodiments, and no further description is given here.

It will be appreciated that fig. 15 shows only a simplified design of a communication device. In practical applications, the communication device may also include other necessary elements, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all communication devices that may implement the present application are within the scope of the present application.

In one possible design, communication device 1500 may be replaced with a chip device, such as a communication chip, for implementing the functions associated with processor 1510 in the communication device. The chip device can be a field programmable gate array, an application specific integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller which can realize related functions, and can also adopt a programmable controller or other integrated chips. In the chip, one or more memories may optionally be included for storing program code that, when executed, causes the processor to perform the corresponding functions.

Fig. 16 is a schematic structural diagram of a terminal device 1600 according to an embodiment of the present application. The terminal device 1600 may be adapted to the systems shown in fig. 3 and 4, and perform the functions of the transmitting end in the above-described method embodiments. The terminal device 1600 may be a particular implementation of the communication device 1400 shown in fig. 14. For convenience of explanation, fig. 16 shows only major components of the terminal device. As shown in fig. 16, the terminal device 1600 includes a processor, a memory, a control circuit, an antenna, and an input-output device. The processor is mainly configured to process the communication protocol and the communication data, control the entire terminal device, execute a software program, and process the data of the software program, for example, to support the terminal device to perform the actions described in the above method embodiments, for example, determining the random access preamble, the frequency point position of the random access preamble, and so on. The memory is mainly used for storing software programs and data, for example, storing preset rules and the like described in the above embodiments. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The control circuit together with the antenna, which may also be called a transceiver, is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user.

When the terminal device is started, the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data is required to be transmitted wirelessly, the processor carries out baseband processing on the data to be transmitted and then outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit carries out radio frequency processing on the baseband signal and then transmits the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.

Those skilled in the art will appreciate that for ease of illustration, fig. 16 shows only one memory and one processor. In an actual terminal device, there may be multiple processors and multiple memories. The memory may also be referred to as a storage medium or storage device, and the embodiments of the present application are not limited in this regard.

As an alternative implementation manner, the processor may include a baseband processor, which is mainly used for processing the communication protocol and the communication data, and a central processor, which is mainly used for controlling the whole terminal device, executing a software program, and processing the data of the software program. The processors in fig. 16 may integrate the functions of the baseband processor and the central processor, and those skilled in the art will appreciate that the baseband processor and the central processor may also be separate processors, interconnected by bus technology, etc. Those skilled in the art will appreciate that the terminal device may include multiple baseband processors to accommodate different network formats, and that the terminal device may include multiple central processors to enhance its processing capabilities, and that the various components of the terminal device may be connected by various buses. The baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, which is executed by the processor to realize the baseband processing function.

In the embodiment of the present application, the antenna and control circuit having the transceiving function may be regarded as the transceiving unit 1601 of the terminal device 1600, for example, for supporting the terminal device to perform the receiving function and the transmitting function as described in fig. 6 or fig. 11. A processor with processing functions is considered to be the processing unit 1602 of the terminal device 1600. As shown in fig. 16, the terminal device 1600 includes a transceiver unit 1601 and a processing unit 1602. The transceiver unit may also be referred to as a transceiver, transceiver device, etc. Alternatively, a device for implementing a receiving function in the transceiver unit 1601 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiver unit 1601 may be regarded as a transmitting unit, that is, the transceiver unit 1601 includes a receiving unit, which may also be referred to as a receiver, an input port, a receiving circuit, or the like, and a transmitting unit, which may be referred to as a transmitter, or a transmitting circuit, or the like.

The processor 1602 may be configured to execute the instructions stored in the memory to control the transceiver unit 1601 to receive signals and/or transmit signals, thereby performing the functions of the transmitting end in the above-described method embodiment. As an implementation, the function of the transceiver unit 1601 may be considered to be implemented by a transceiver circuit or a dedicated chip for transceiving.

Fig. 17 is a schematic structural diagram of a network device, such as a base station, according to an embodiment of the present application. As shown in fig. 17, the base station may be applied to the system shown in fig. 3 or fig. 5, and perform the functions of the transmitting end, the first communication device, or the second communication device in the above method embodiment. Base station 1700 may include one or more radio frequency units, such as a remote radio frequency unit (remote radio unit, RRU) 1710 and one or more baseband units (BBU) (also referred to as digital units, DUs) 1720. The RRU 1710 may be referred to as a transceiver unit, transceiver circuitry, or transceiver, etc., which may include at least one antenna 1711 and a radio frequency unit 1712. The RRU 1710 is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals and baseband signals. The BBU1720 portion is mainly used for baseband processing, control of a base station, and the like. The RRU 1710 and BBU1720 may be physically located together or may be physically separate, i.e., a distributed base station.

The BBU1720 is a control center of the base station, and may also be referred to as a processing unit, and is mainly configured to perform baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and so on. For example, the BBU (processing unit) 1720 may be used to control a base station to perform the operational procedures described above with respect to the network device in the method embodiments.

In one example, the BBU 1720 may be configured by one or more single boards, where the multiple single boards may support a single access indicated radio access network (e.g., an LTE network) together, or may support radio access networks of different access schemes (e.g., an LTE network, a 5G network, or other networks) respectively. The BBU 1720 further comprises a memory 1721 and a processor 1722, said memory 1721 for storing necessary instructions and data. For example, the memory 1721 stores the preset rules in the above embodiment. The processor 1722 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the operation procedure related to the network device in the above method embodiment. The memory 1721 and processor 1722 may serve one or more boards. That is, the memory and the processor may be separately provided on each board. It is also possible that multiple boards share the same memory and processor. In addition, each single board can be provided with necessary circuits.

The application also provides a communication system comprising one or more network devices as described above and one or more terminal devices.

It should be appreciated that the processor in embodiments of the application may be a central processing unit (Central Processing Unit, CPU), which 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 appreciated that the memory in embodiments of the present application may be either 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 but not limitation, many forms of random access memory (random access memory, RAM) are available, such as Static RAM (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced Synchronous Dynamic Random Access Memory (ESDRAM), synchronous Link DRAM (SLDRAM), and direct memory bus RAM (DR RAM).

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more sets of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.

It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

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 thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

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 by the present 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 the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units 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 on 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 the embodiments 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 this 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, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: 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 illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within 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 of communication, comprising:

2. The method of claim 1, wherein the determining the channel state for the first time period in the j-th reservation period for each of the plurality of transmission resources for which LBT interception is currently outstanding comprises:

3. The method of claim 1, wherein the determining the channel state for the first time period in the j-th reservation period for each of the plurality of transmission resources for which LBT interception is currently outstanding comprises:

if the channel detection result of the first transmission resource in the second time period in the j-th reservation period in each transmission resource of the current unfinished LBT interception in the plurality of transmission resources is idle, and the channel detection result in the second time period in the j-1-th reservation period is idle, setting the corresponding rollback random number P at the end time of the j-th reservation period as Wherein S1 is the first time period duration, S2 is the first time period duration, T1 is the detection period of the initial CCA, T2 is the extended CCA detection period, and>representing a downward rounding;

4. A method according to any one of claims 1 to 3, wherein the method further comprises:

5. A method according to any one of claims 1 to 3, wherein the preset time period is 2 times the reservation period time period.

6. A communication device, comprising:

a processing unit, configured to determine a starting time slot for transmitting data by a transmission resource for which listen before talk LBT listening is first completed in the plurality of transmission resources;

the processing unit is further configured to perform the following operations from a first reservation period to an nth reservation period after LBT interception is completed by an ith transmission resource in transmission resources for which LBT interception is currently completed in the plurality of transmission resources, where a duration between a start time of the (n+1) th reservation period and the start time slot is less than a preset duration:

7. The communication device of claim 6, wherein the processing unit is specifically configured to:

8. The communication device of claim 6, wherein the processing unit is specifically configured to:

9. The communication device of any of claims 6 to 8, wherein the processing unit is further to:

the communication device further includes:

and the sending unit is used for sending the data to be sent on the ith transmission resource if the channel detection result is idle.

10. A communication device according to any of claims 6 to 8, wherein the preset time period is 2 times the reservation period time period.

11. A method of communication, comprising:

12. The method of claim 11, wherein the method further comprises:

13. A communication device, comprising:

a processing unit, configured to determine a starting time slot for transmitting data for a main channel for which listen-before-talk LBT listening is completed in a plurality of channels;

The processing unit is further configured to: starting from a first reserved period to an Nth reserved period after the primary channel finishes LBT interception, executing the following operations, wherein the duration between the starting time of the (N+1) th reserved period and the starting time slot is smaller than a preset duration:

14. The communication device of claim 13, wherein the processing unit is further to:

the communication device further includes:

and the sending unit is used for sending data to be sent on the main channel and any channel except the main channel from the initial time slot if the channel interception result of the main channel in the at least one second channel is idle when the initial time slot arrives.

15. A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1 to 5, 11, 12.