WO2016054817A1

WO2016054817A1 - Resource competing, signal transmitting and signal receiving method and device

Info

Publication number: WO2016054817A1
Application number: PCT/CN2014/088347
Authority: WO
Inventors: 官磊; 马莎
Original assignee: 华为技术有限公司
Priority date: 2014-10-11
Filing date: 2014-10-11
Publication date: 2016-04-14
Also published as: CN105900514B; CN105900514A

Abstract

Disclosed in an embodiment of the present invention is a resource competing method. The method comprises: determining the length of the back-off time according to a time interval between a first time and a starting time of a next sub-frame, the length of the back-off time being not greater than the time interval. Based on the method in the embodiment of the present invention, a communication device completes back-off before the starting time of the next sub-frame, thus avoiding the possibility of crossing the starting time of the sub-frame during the process of backing off such that the time of backing off and the time of transmitting a fill-in signal by the communication device do not exceed the length of a sub-frame. The method of the embodiment improves resource utilization for the communication device having a fixed sub-frame boundary.

Description

Method and device for competing resources, transmitting signals and receiving signals

Technical field

Embodiments of the present invention relate to the field of communications, and in particular, to a competitive resource technology in a communication device.

Background technique

In the existing mobile communication network, the spectrum resources used by the operator are divided into two types, one is an unlicensed spectrum resource and the other is a licensed spectrum resource. Authorized spectrum resources, that is, only operators that have purchased the licensed spectrum have the right to use. Unlicensed spectrum resources do not need to be purchased, and they can be used free of charge as long as they meet certain requirements. Unlicensed spectrum resources are gradually receiving attention from operators today due to the scarcity of licensed frequency bands and high prices. How to reasonably and efficiently compete in the unlicensed frequency band to send resources is an urgent problem to be solved.

An existing method for competing resources is Listening Before Talk (LBT). The basic idea of LBT is: Before each communication device sends a signal on a certain channel, it needs to detect whether the current channel is idle, that is, Whether it is possible to detect that a nearby node is occupying the channel to transmit a signal, the detection process is called Clear Channel Assessment (CCA); if the channel is idle for a period of time, the communication device can send a signal. If the channel is detected to be occupied, the communication device is currently unable to transmit a signal.

When the communication device detects that the channel is occupied, the communication device may choose to wait for the channel to be idle again, and then transmit data; considering that when the channel is idle again, there may be multiple communication devices that transmit signals. In order to reduce the collision probability of signals transmitted by different communication devices, a fallback mechanism needs to be introduced.

An existing fallback mechanism is a fallback mechanism based on a random duration, that is, a time length is randomly selected as a backoff time length within a fixed range, and the backoff time length is used for backoff. This fixed range It is called the Competition Window. In a specific implementation process, the backoff counter may be applied to implement the mechanism: for each communication device that needs a contention resource, randomly select a value in the contention window for the respective backoff counter as an initial value; Communication device, when no other communication device has been detected within one CCA window time If the current channel is occupied, the backoff counter is updated, for example, minus one, but when the current channel is detected to be occupied, the backoff counter is suspended until the channel is found to be idle again, and continues according to the CCA window. The CCA result updates the backoff counter; if the backoff counter of a certain communication device is updated to a preset threshold, the communication device occupies a channel transmission signal.

The above-mentioned fallback mechanism is widely used in existing unlicensed spectrum, such as Wi-Fi systems. However, for a system with a fixed subframe boundary like the Unlicensed Long Term Evolution (U-LTE) system, directly applying this mechanism will bring about a problem of low resource utilization, which is related to a fixed subframe. The characteristics of the boundary are related:

Taking U-LTE as an example, U-LTE inherits the frame structure of the LTE system and requires a relatively fixed frame structure, and the frame boundary or subframe boundary is fixed in time, in other words, for a U-LTE In the system, the frame boundary or the subframe boundary corresponds to the determined time in time, and the frame or subframe boundary includes the start time and the end time of the frame or the subframe. Such a fixed frame boundary or a subframe boundary has the following advantages: the synchronization complexity of the receiving end and the transmitting end is reduced; the neighboring cell can perform interference coordination by time synchronization, especially for the TDD system; performing unlicensed carrier and When the carrier aggregation of the authorized carrier is performed, the time synchronization between the unlicensed carrier and the authorized carrier can be ensured, and the uplink feedback channel can be transmitted on the authorized carrier, which reduces the transmission delay of the feedback channel.

For most communication systems with fixed subframe boundaries, the subframe boundary is both the start time of the next subframe and the termination time of the previous subframe. When a system with a fixed subframe boundary competes with other systems at the same time, the resource utilization may be low. The scenario where the U-LTE system and the Wi-Fi system coexist is taken as an example: for a Wi-Fi node, When performing the rollback, the Wi-Fi node can immediately send the service information as long as the backoff counter is updated to the preset threshold; for the U-LTE sending node, when the rollback is performed, when the backoff counter is updated to the preset Threshold, according to the fallback mechanism, the U-LTE node can already send a signal at the current moment, but since the current moment may not be aligned with the subframe boundary, the current time cannot transmit the useful signal.

One method is that the U-LTE node sends a padding signal from the current time to fill the channel. In order to achieve the purpose of occupying the channel, provision is made for subsequent transmission of signals on the channel.

Although such a method of pre-filling a channel may enable a communication device having a fixed subframe boundary to successfully occupy a channel in a process of contending for a transmission resource, since it may cross its subframe boundary during execution of a backoff, thereby obtaining competition The time of the resource is too long from the boundary time of the next subframe, resulting in waste of resources. Give an example to illustrate this problem:

The length of the competition window is 100 microseconds (μs), and the length of the subframe of the U-LTE node is 1 millisecond (millisecond, ms). In the scenario, the Wi-Fi node occupies the channel, and the U-LTE node needs to transmit data; when the Wi-Fi node releases the channel at a time of 90 μs from the start time of the next subframe of the U-LTE node, the channel transits to idle; The LTE node competes for resources, randomly selecting 95 μs as the backoff time length in the 100 μs contention window, and performing the fallback.

It is easy to know that, when there are no other nodes in the scenario to contend for the channel, the U-LTE node will confirm the contention to the transmission resource after 95 μs, and the time from the boundary of the previous subframe of the U-LTE node is 5 μs. The next subframe boundary time interval at which the next useful signal can be transmitted is 995 μs, which means that the U-LTE node needs to transmit a 995 μs fill signal to occupy the channel.

The above example shows a scenario in which a communication device with a fixed subframe boundary transmits a fill signal for too long when competing for unlicensed spectrum resources. In summary, when a communication device with a fixed subframe boundary competes for an unlicensed spectrum resource, there is a possibility that the time for transmitting the padding signal is too long, thereby causing a low utilization rate of the transmission resource.

Summary of the invention

The embodiment of the invention provides a method and a device for competing resources, which are used to solve the problem that when the backoff process crosses the subframe boundary, the time for sending the padding signal is too long and the utilization of the transmission resource is low.

In one aspect, the embodiment of the present invention provides a method for competing resources, and the method includes:

The first communication device determines a length of the backoff time;

Detecting a channel within the length of the backoff time, and obtaining a detection result;

The backoff time length is not greater than a time interval between the first time and the start time of the next subframe;

Wherein the first moment is determined by the channel transitioning to an idle moment; or

The first moment is a moment when the first communication device releases the channel.

In a second aspect, an embodiment of the present invention provides an apparatus for competing resources, including a processor and a transceiver, where:

The processor is configured to determine a length of a backoff time;

The transceiver is configured to detect a channel within the length of the backoff time to obtain a channel detection result;

The first moment is a moment when the device that contends for the resource releases the channel.

In a third aspect, an embodiment of the present invention provides an apparatus for competing resources, including:

a first determining module, configured to determine a length of the backoff time;

a detecting module, configured to detect a channel in the back-off time, and obtain a detection result;

According to the solution, the communication device determines the length of the backoff time according to the time interval between the first time and the start time of the next subframe, and performs rollback according to the back time length. Since the length of the backoff time is limited to the time interval, the communication device avoids the situation that the sending filler signal is too long due to crossing the subframe boundary during the backoff process, thereby improving the utilization of the transmission resource. The problem.

The present invention also provides a method for transmitting a message, which is also used to solve the problem that when a communication device having a fixed subframe boundary contends for a resource, the time for transmitting the padding signal is too long, and the utilization rate of the transmission resource is low. The problem.

In a fourth aspect, an embodiment of the present invention provides a method for transmitting a signal, where the method includes:

The first communication device continuously transmits a signal in an available subframe time before the second moment;

The first communication device releases the channel at the second moment;

The second moment is in a last available subframe of the first communications device; a time interval between the second moment and a starting moment of a next subframe is not less than a length of a contention window.

In a fifth aspect, an embodiment of the present invention provides a device for transmitting a signal, where the device includes 31, a device for transmitting a signal, including a processor and a transceiver:

The processor is configured to control the transceiver to continuously send a signal in a available subframe time before the second moment;

The processor is further configured to control the transceiver to release the channel at the second moment;

The second moment is in a last available subframe of the apparatus for transmitting a signal; a time interval between the second moment and a start time of a next subframe is not less than a length of a contention window.

In a sixth aspect, an embodiment of the present invention provides an apparatus for sending a signal, including:

a first sending module, configured to continuously send a signal in a available subframe time before the second moment;

a release module, configured to release the channel at the second moment;

In a seventh aspect, an embodiment of the present invention provides a method for competing resources, including:

The third communication device detects that the channel transitions to idle at the second moment;

The third communication device detects a channel within the length of the backoff time, and obtains a detection result;

The length of the backoff time is determined by the length of the contention window;

The time interval between the second moment and the start time of the next subframe is not less than the The length of the competition window.

In an eighth aspect, an embodiment of the present invention provides a device for competing resources, including a processor and a transceiver, where:

The transceiver is configured to detect that the channel transits to idle at a second moment;

The transceiver is further configured to detect a channel within a length of the backoff time to obtain a detection result;

The length of the backoff time is determined by the processor according to a length of the contention window;

The time interval between the second moment and the start time of the next subframe is not less than the length of the contention window.

In a ninth aspect, an embodiment of the present invention provides an apparatus for competing resources, including:

a first detecting module, configured to detect that the channel is idle during the second time;

a second detecting module, configured to detect a channel within a length of the backoff time, and obtain a detection result;

In a tenth aspect, an embodiment of the present invention provides a method for receiving a signal, including:

Receiving, by the second communications device, a message sent by the first communications device;

Determining, by the second communications device, a second time instant according to the message, wherein the second time instant is a time when the first communications device releases a channel in its last available subframe;

The second communication device receives a signal in the last available subframe according to the second moment;

In an eleventh aspect, an embodiment of the present invention provides an apparatus for receiving a signal, including a processor and a receiver:

The receiver is configured to receive a message sent by the first communications device;

The processor is configured to determine a second moment according to the message, where the second moment is At the moment when the first communication device releases the channel in its last available subframe;

The receiver is further configured to receive a signal in the last available subframe according to the second moment;

According to a twelfth aspect, an embodiment of the present invention provides an apparatus for receiving a signal, including: a first receiving module, configured to receive a message sent by a first communications device;

Determining a module, determining a second time according to the message, wherein the second time is a time when the first communication device releases a channel in its last available subframe;

a second receiving module, configured to receive a signal in the last available subframe according to the second moment;

According to the solution of the embodiment of the present invention, the time at which the channel is released in the last subframe that can be occupied is determined according to the relationship between the length of the contention window and the subframe boundary. Due to the second moment, that is, the time interval at which the first communication device releases the channel and the start time of the next subframe is not less than the length of the contention window, this method may enable the communication device to return in the next competition. The retreat process does not cross the sub-frame boundary as much as possible, thereby avoiding waste of resources due to over-filling in the process of pre-filling the channel.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the prior art or the embodiments will be briefly described below. Obviously, the drawings in the following description are only some implementations of the present invention. For example, other drawings may be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a flowchart of a method for competing resources according to an embodiment of the present invention;

2 is a timing diagram according to an embodiment of the present invention;

FIG. 3 is a flowchart of a method for transmitting a signal according to an embodiment of the present invention;

4 is a timing diagram according to an embodiment of the present invention.

FIG. 5 is a timing diagram according to an embodiment of the present invention.

6 is a flowchart of a method for competing resources according to an embodiment of the present invention;

FIG. 7 is a flowchart of a method for receiving a signal according to an embodiment of the present invention;

FIG. 8 is a structural block diagram of an apparatus for competing resources according to an embodiment of the present invention; FIG.

FIG. 9 is a structural block diagram of an apparatus for transmitting a signal according to an embodiment of the present invention;

FIG. 10 is a structural block diagram of a device for competing resources according to an embodiment of the present invention; FIG.

FIG. 11 is a structural block diagram of an apparatus for receiving a signal according to an embodiment of the present invention;

FIG. 12 is a structural block diagram of an apparatus for competing resources according to an embodiment of the present invention; FIG.

FIG. 13 is a structural block diagram of an apparatus for transmitting a signal according to an embodiment of the present invention; FIG.

FIG. 14 is a structural block diagram of an apparatus for competing resources according to an embodiment of the present invention; FIG.

FIG. 15 is a structural block diagram of an apparatus for receiving a signal according to an embodiment of the present invention.

detailed description

Example 1

The embodiment of the present invention provides a method for competing resources. By limiting the length of the backoff time to a certain range, the possibility of crossing the subframe boundary in the backoff process is reduced, and the back-off process is avoided. The retreat time plus the time that the channel is filled exceeds one sub-frame length occurs, thereby improving resource utilization. The method proposed by the embodiment of the present invention can be used in a communication device having a fixed subframe boundary. Figure 1 shows the steps of the method, the steps comprising:

101. The first communications device determines a length of the backoff time.

In a specific implementation process, optionally, the first communications device determines the length of the backoff time according to a time interval between the first time and the start time of the next subframe.

The first moment is determined by the channel transitioning to an idle moment. Optionally, the first time is specifically a time when the channel transits to idle; or the first time is specifically a time after the channel transitions to idle and delays the inter-frame gap IFS. The IFS may be a short short IFS (ie, Short IFS, SIFS), for example, about 9 us in a time division duplex U-LTE system; or may be a distributed IFS (ie, Distributed IFS, DIFS), for example, in a time division double It is about 20us in the U-LTE system; it can also be other IFS.

In a specific implementation process, the communication device first detects whether the channel is idle before transmitting the data, and if the channel is not in an idle state, or the channel is in an occupied state, the communication device cannot transmit data. The communication device may continue to detect the channel. When it is detected that the channel is idle, the channel is considered to be idle, and the time may be used as the first time; in a specific implementation process, the problem of the inter-frame gap IFS may also be considered, that is, when The time when the channel transitions to idle and then delays the IFS is detected as the first time. IFS, such as DIFS, is introduced to protect high-priority signals from being sent first. For example, the ACK feedback of a Wi-Fi system requires only SIFS, so delaying a DIFS protects the transmission of the above ACK.

The first moment may also be a moment when the first communications device releases the channel after successfully competing for resources in the previous round. Optionally, the first communications device continuously sends a signal in an available subframe time before the first moment; the time interval between the first moment and the start time of the next subframe is not less than a competition. The length of the window. For the method of releasing the channel, refer to the content of step 301 and step 302 in Embodiment 3 of the present invention, and details are not described herein again.

The backoff time length is not greater than the time interval.

In a specific implementation process, the start time of the next subframe refers to the future first subframe start time that is based on the first moment. For most communication systems with fixed subframe boundaries, the subframe boundary is both the start time of the next subframe and the termination time of the previous subframe.

In a specific implementation process, the backoff time length is not greater than the time interval, that is, not greater than the time interval between the first time and the start time of the next subframe. This means that for the real In the communication device of the embodiment of the present invention, the communication device performs backoff with the backoff time length from the first moment, because the backoff time length is not greater than the first time to the start of the next subframe. The time interval between the moments, before the arrival of the next subframe start time, the communication device must be able to determine whether to occupy the channel, avoiding crossing the subframe boundary during the backoff process, that is, crossing the next subframe Frame start time.

Further, when the communication device determines to occupy the channel but has not reached the start time of the next subframe, the communication device may send a padding signal to occupy the channel, and the communication device sends a padding signal until the next At the start of a sub-frame, a useful signal is sent. If the communication device crosses the start time of the next subframe in the fallback process and successfully contends to the transmission resource of the channel, this means that the communication device retreats the length of time and the time of transmitting the padding signal. The length exceeds the length of one subframe, thereby causing waste of resources; if the communication device applies the embodiment of the present invention, avoiding the start time of the next subframe in the fallback process and successfully competing for the channel The transmission resource, the length of the backoff time of the communication device and the length of the transmission of the padding signal does not exceed the length of one subframe, which reduces the waste of the transmission resources and improves the utilization of resources. Optionally, the value range of the backoff time length is determined according to the time interval between the first time and the start time of the next subframe. In other words, the length of the contention window is determined according to the time interval between the first time and the start time of the next subframe.

Optionally, the upper limit of the value range of the backoff time length is not greater than the length of the time interval between the first time and the start time of the next subframe. In other words, the length of the contention window is not greater than the length of the time interval between the first time and the start time of the next subframe. In a specific implementation process, the length of the backoff time may be selected according to the length of the contention window. Specifically, the length of the contention window is a selection range of the length of the backoff time, and the communication device needs to select from the length of the backoff time. Select within the range of the length of the backoff time.

Optionally, determining the length of the backoff time according to the value range of the backoff time length. In a specific implementation process, an optional method for determining the length of the backoff time is: randomly selecting a time length as the backoff time length within a range of values of the backoff time length. For the reference In the case of communication devices that compete with resources, the random selection method ensures the fairness of different communication devices when competing for resources. Specifically, the randomly selected backoff time length enables any communication device participating in the contention resource to have the shortest time of the backoff in the current round of competition, thereby acquiring the transmission resource of the channel in the shortest time.

102. Detect a channel within the length of the backoff time, and obtain a detection result.

Optionally, after step 102, the method further includes: determining, according to a result of detecting the channel, whether to occupy the channel; optionally, if the channel is idle during the backoff time, then in the next sub Before the start time of the frame arrives, the transmit fill signal occupies the channel; optionally, if the channel is occupied during the backoff time, the channel is not occupied.

In a specific implementation process, a method for detecting a channel includes an idle channel evaluation CCA, specifically detecting whether a channel is idle for a period of time. Optionally, the first communications device detects the channel, and if the channel is idle during the backoff time, sending a fill signal occupies the foregoing before the start time of the next subframe arrives. Channel; optionally, the first communication device detects the channel, and if the channel is occupied during the backoff time, the channel is not occupied.

In a specific implementation process, the method of the embodiment of the present invention may be applied to a communication device having a fixed subframe boundary, where the communication device includes, but is not limited to, a U-LTE cell base station, an evolved U-LTE cell base station, and a U-LTE terminal. Equipment, evolved U-LTE terminal equipment, terminal equipment with Wi-Fi function, and the like.

In the embodiment of the present invention, the length of the backoff time is determined according to the time interval between the first time and the start time of the next subframe, and the back time length is less than the back time interval. In the method of the embodiment of the present invention, the time at which the backoff is ended is limited to the start time of the next subframe, and the time length of sending the padding signal plus the backoff time is avoided due to the backoff process spanning the subframe boundary. The length is longer than the length of one subframe. Applying the method of the embodiment of the invention improves the utilization of resources.

The embodiment of the present invention is further described by taking the scenario mentioned in the background as an example. The subframe length of the U-LTE node is 1 ms. In the scenario, the Wi-Fi node occupies the channel, and the U-LTE node has data to be transmitted; when the Wi-Fi node is at the starting time of the next subframe from the U-LTE node, there is still 90 μs. Release the channel, the channel transits to idle; the U-LTE node contends for the resource, and determines the length of the contention window to be 90 μs according to the time when the channel transits to idle and the start time of the next subframe, that is, the next subframe boundary. The 90 μs contention window randomly selects the length of the backoff time and performs a fallback.

It is easy to know that if there are no other nodes in the scenario to contend for the channel, the U-LTE node will confirm the contention to the transmission resource within 90 μs, thereby avoiding the situation that the backoff time exceeds 90 μs and the sub-frame boundary is crossed during the fallback process. occur. In other words, the sum of the backoff time of the U-LTE node and the time when the padding signal is sent after competing for the resource is 90 μs on the premise that the channel is idled as the fallback start time; Based on the prior art example in the technology, the total time is reduced by 90%, thereby increasing the utilization of resources.

Optionally, in a specific implementation process, the rollback mechanism may be implemented by using a mechanism for backing off the counter. Specifically, the length of the backoff time may be divided into units of the idle channel evaluation CCA time window, and the backoff time length is divided by the rounding value of the quotient of the CCA time window as the initial value of the backoff counter; The CCA result is used as an update basis for the backoff counter; when the backoff counter is updated to a preset threshold, the channel is occupied. This method is simple to implement in engineering. The method for implementing the backoff time length by means of the backoff counter includes the following steps:

An initial value of the backoff counter is set; wherein an initial value of the backoff counter satisfies a quotient of the length of the backoff time divided by the duration of the CCA window.

Optionally, the initial value of the backoff counter satisfies the quotient of the backoff time length divided by the CCA window time. If the quotient is not an integer, the initial value of the backoff counter satisfies the quotient of the quotient Round or round down.

Whether to occupy the channel is determined according to the initial value of the backoff counter and the result of the idle channel evaluation CCA.

In a specific implementation process, the initial value of the backoff counter corresponds to the length of the backoff time.

Optionally, if the channel is idle during the CCA window time, the backoff counter is updated. Specifically, updating the back-off counter refers to changing a value of the back-off counter. Optionally, the value of the back-off counter is incremented or decremented by one. The specific update method is related to a preset threshold. There is no limit here.

Optionally, if the channel is occupied in the CCA time window, suspending the backoff counter, and when detecting that the channel is idle again, continuing to perform a rollback according to the value of the backoff counter; or resetting the back The back-off counter, an optional reset method, includes setting a value of 0 or a larger value for the back-off counter. The specific reset method is not limited to the update method of the back-off counter.

If the backoff counter is updated to a preset threshold, the channel is occupied. Optionally, the preset threshold is 0, and when the backoff counter is updated to 0, it indicates that the communication device can occupy the channel.

In a specific implementation process, optionally, the fallback mechanism may be implemented by another mechanism for backing off the counter. Specifically, the initial value range of the backoff counter may be determined according to the interval between the first time and the start time of the next subframe, and the backoff counter is selected according to the initial value range of the backoff counter. The initial value updates the value of the backoff counter according to the CCA result of the CCA time window. When the value of the backoff counter is updated to a preset threshold, the communication device occupies the channel. The specific steps include:

The initial value range of the backoff counter is determined according to the interval between the first time and the start time of the next subframe.

Optionally, the initial value of the backoff counter ranges from [a, b], where a is an integer not less than 0, and b includes an upward quotation of the quotient of the time interval divided by the idle channel evaluation CCA window duration. The result of rounding down or down.

And determining an initial value of the backoff counter according to a value range of the initial value of the backoff counter.

Optionally, within the range of values, an integer is randomly selected as an initial value of the backoff counter. Since the duration of the CCA window is a certain period of time, when the initial value of the backoff counter is determined, the length of the backoff is actually determined.

Updating the backoff counter according to the CCA result in the CCA time window; specifically, if The backoff counter is updated when the channel is idle within the CCA time window. The update backoff counter refers to updating the value of the backoff counter, for example, adding one to the value of the backoff counter, or subtracting one.

In a specific implementation process, the implementation method of the back-off counter according to the embodiment of the present invention can also be equivalently converted into an implementation method using a back-off timer, starting with the method proposed by the embodiment of the present invention, and using the back-off timing. The method of implementation is also within the scope of the present invention.

Optionally, the value range of the backoff duration or the value range of the initial value of the backoff counter may be determined according to the foregoing time interval and the duration of the channel continuously occupying the channel. Generally, if the duration of consecutively occupying the channel after competing for the channel is longer, the determined backoff duration or the range of the backoff counter is larger; otherwise, the smaller. For example, if the U-LTE nodes of the two competing channels are synchronized, then the time interval is consistent for the two. If the back-off duration or the range of the counter is determined only according to the time interval, then The two are the same, and there may be competition conflicts. Then, the value range may be further determined according to the length of time that the two need to be sent after the channel competes with the channel. For example, if the U-LTE node 1 needs to occupy 10 subframes after competing for the channel, the U-LTE node 2 if After competing to the channel, it takes 5 subframes, so the former has a larger value range than the latter. For example, the value range of the initial value of the backoff counter is [1, 10] for node 1, and [1, 5] for node 2, then the initial value of node 2 is selected with a higher probability. It is smaller than the node 1, and the time that the node 2 occupies the channel is short, and it does not seriously affect the subsequent occupation of the channel by the node 1.

The method for competing resources in this embodiment determines the length of the backoff time according to the time interval between the first time and the start time of the next subframe, where the back time length is not greater than the time interval. Based on the method of the embodiment of the present invention, the communication device can complete the rollback before the start time of the next subframe, avoiding the possibility of crossing the start time of the subframe in the backoff process, thereby causing the backoff time and the transmission padding of the communication device. The time of the signal does not exceed the length of one subframe. With the method of the embodiment, the utilization of resources can be improved for a communication device having a fixed subframe boundary.

Example 2

The embodiment of the present invention further describes the method of Embodiment 1 based on Embodiment 1 in combination with two specific scenarios.

In the scenario of the embodiment of the present invention, a first U-LTE communication device and a second U-LTE communication device having a fixed subframe boundary are included; the first U-LTE communication device and the second U-LTE communication device are frame synchronization. And the subframe boundary is both the start time of the next subframe and the end time of the previous subframe; the scene also includes a Wi-Fi node that does not have a fixed subframe boundary.

In the scenario of the embodiment of the present invention, the subframe length of the first U-LTE communication device and the second U-LTE communication device is 1 ms; the CCA window of the first U-LTE communication device and the Wi-Fi node when performing CCA The length is 10μs. 2 is a timing diagram showing signals transmitted by the present Wi-Fi node, the first U-LTE communication device, and the second U-LTE communication device.

In the scenario, the Wi-Fi node is occupying the channel to transmit data, and the first U-LTE communication device and the second U-LTE communication device detect whether the channel is idle when the data bearer is to be sent, that is, the CCA is executed. . At this time, since the Wi-Fi node is occupying the channel, the first U-LTE communication device and the second U-LTE communication device may detect that the channel is not idle and cannot transmit a signal.

It is assumed that at time t ₀ , that is, when there is still 50 μs from the subframe boundary of the first U-LTE communication device, the Wi-Fi node stops transmitting signals, and the channel goes idle. At this time, the first U-LTE communication device and the second U-LTE communication device detect that the channel is idle, and determine the first moment according to the moment. An optional method is to transfer the channel to idle. Time is the first moment.

The first U-LTE communication device and the second U-LTE communication device determine the length of the backoff time according to a time interval between the first time and the start time of the next subframe. One way to achieve the length of the rollback time is to use a backoff counter. In this scenario, the time interval is 50 μs. Since the CCA window time is 10 μs, a data value range [0, 5] can be set; within this range, the first U-LTE communication device and the second Within this range of values, the U-LTE communication device randomly selects integers as the initial values of the respective backoff counters. Here, it is assumed that the back value of the back-off counter randomly selected by the first U-LTE communication device is 3, and the initial value of the back-off counter randomly selected by the second U-LTE communication device is 5.

The first U-LTE communication device and the second U-LTE communication device determine whether to occupy the channel according to the result of the idle channel evaluation CCA within the backoff time length. Specifically, the first U-LTE communication device and the second U-LTE communication device start from the first moment, and use the CCA window time as a detection unit to detect whether the channel is idle. When no channel is occupied during a CCA window time, the backoff counter of the communication device is updated, specifically in this embodiment, the backoff counter is decremented by one; and when the backoff counter is updated to 0, it is considered to be competing to send resources. That is, 0 is the preset threshold of the backoff counter.

Specifically, as shown in the timing shown in FIG. 2, after 10μs at time _0, when particularly t, i.e., at time t1, the backoff counter of the first U-LTE 4 by the communication apparatus 3 is updated, the second U-LTE communication device The backoff counter is updated from 5 to 4.

Suppose beginning from t ₀ has no other communication device seizing the channel, the time t _2, i.e. the time from the time t ₀ 30μs, the backoff counter of the first U-LTE updates the communication device to 0, a first U-LTE communication device advance filling channel, i.e. the transmission fill signal occupies the channel, and reaches the sub-frame boundary time t ₃ to start sending useful signal; a second U-LTE communication apparatus starts from time t _2, when executing the CCA, the detected channel is occupied, Then stop updating the backoff counter.

The above is a process of contending to send resources. It can be seen that the first U-LTE communication device or the second U-LTE communication device does not cross the subframe boundary when performing the rollback, thereby making the current U-LTE communication device When the first or second U-LTE communication device competes to transmit resources and sends a padding signal, the time for transmitting the padding signal is not excessively long, thereby improving resource utilization.

In the above implementation process, the update method of the back-off counter is specifically reduced by one each time, and the preset threshold is 0. In a specific implementation process, the update manner of the back-off counter may also be one for each time, and the preset threshold is For a fixed value greater than 0, the initial value is randomly selected when the back-off counter is initialized; in a specific implementation process, the preset threshold may be reset when the back-off counter is initialized, thereby using the same The initial values and update rules are updated. Various implementation methods based on the idea of the embodiments of the present invention are all within the scope of the present invention.

In the above implementation process, the method of applying the backoff counter implements the contention process, and those skilled in the art should recognize that the method of applying the backoff counter can be equivalently converted into the method of applying the timer. It is also within the scope of the present invention to apply a timer to implement the method of the embodiments of the present invention.

According to the above analysis, it can be known that the method in the embodiment of the present invention avoids the time length of sending the padding channel because the backoff process spans the subframe boundary by limiting the backoff end time to the start time of the next subframe. Long situation. Based on the embodiment of the present invention, the overhead of sending a padding signal can be reduced, and resource utilization can be improved.

Example 3

However, in a real-life scenario, the backoff time of some communication devices cannot be determined according to the time interval between the time when the channel transits to idle and the start time of the next frame. For example, the communication device does not have the detection before competing for resources. The ability to start at a sub-frame. In this case, the method for transmitting a signal is proposed in the embodiment of the present invention, and the method is applicable to a communication with a fixed subframe boundary. Equipment or system System. Figure 3 shows the steps of an embodiment of the present invention, the first communication device and the third communication device mentioned in the steps are devices having fixed subframe boundaries, and the communication devices include but are not limited to U-LTE cell base stations, evolved U - an LTE cell base station, a U-LTE terminal device, an evolved U-LTE terminal device, a Wi-Fi enabled terminal device, etc., the method steps include:

Step 301: The first communications device continuously sends a signal in an available subframe time before the second moment.

Step 302: The first communications device releases the channel at the second moment;

In a specific implementation process, the length of the contention window is preset, or the length of the contention window is predictable, and the length thereof represents a range in which the communication device selects the length of the backoff time when performing the fallback mechanism. The length of the competition window can be either time or other unit corresponding to the time. For example, if the length of the contention window is 100 μs, it means that the upper limit of the length of the back-off time is 100 μs when the rollback is performed; for example, in the case of the back-off counter as the back-off time length embodiment, the value of the contention window is 10 , indicating that the initial value selection threshold of the backoff counter is 10, and if the CCA window time of each update back counter is 10 μs, the time corresponding to the contention window is 100 μs.

In a specific implementation process, the first communication device has contend for the transmission resource, ie the first communication device has or will transmit a signal on the channel. The first communication device may use the method in the first embodiment of the present invention to compete for the transmission resource, and may also use other methods. As for how the first communication device competes to obtain the transmission resource, the embodiment of the present invention is not limited.

In a specific implementation process, the first communication device may occupy one or consecutive multiple subframes to transmit signals. Specifically, in a system with a fixed subframe boundary, the width of the subframe is determined. For example, in a U-LTE system, the width of the subframe is 1 ms. The last available subframe referred to in step 301 refers to the last available subframe of one or more consecutive subframes occupied by the first communication device.

In a specific implementation, the first communication device continuously transmits signals in available subframes. Specific The first communication device sends a signal that is continuous with the previous transmission signal before the second moment of the last available subframe.

The time interval between the second moment and the start time of the next subframe is not less than the length of the contention window. In a specific implementation process, the time when the first communication device releases the channel is the second time, and since the time interval between the second time and the start time of the next subframe is not less than the length of the contention window, this means After the channel is released by the first communication device, if the first communication device or other communication device has a need for a contention channel, the communication device may complete the time when the channel transitions to idle to the next subframe boundary. Based on the process of the contention channel of the fallback mechanism, the situation of crossing the next subframe boundary does not occur during the fallback process, thereby avoiding the situation that the channel is excessively pre-filled in order to occupy the channel due to crossing the subframe boundary.

Preferably, in a specific implementation process, a time interval between the second time instant and a start time of the next subframe is equal to a difference between the length of the last available subframe and the length of the contention window. This means that when the first communication device or other communication device has a need for a contention channel, the communication device must complete the contention channel based on the fallback mechanism during the time when the channel transits to the idle time to the next subframe boundary. The process does not occur across the next subframe boundary in the fallback process, thereby avoiding the situation that the channel is excessively pre-filled in order to occupy the channel due to crossing the subframe boundary; and, when the communication device selects the backoff time length When the maximum duration, that is, the duration of the contention window, the time at which the communication device contends to transmit the resource is exactly the subframe boundary, that is, it is not necessary to fill the channel in advance to occupy the channel. This method not only avoids the problem of excessively long to send the fill signal, but also statistically minimizes the time to send the fill signal.

Optionally, in a specific implementation process, the time interval between the second moment and the start time of the next subframe may also be selected from a limited set of time lengths. Specifically, if the subframe length is 1 ms and the contention window length is 150 μs, then preferably, the first time length is 850 μs, but in a specific implementation process, it is easier to implement the sending for the first communication device. The time length is an integral multiple of 100 μs, then 800 μs can be selected as the length of the first time in the set of selectable transmission time lengths {100 μs, 200 μs, 300 μs ... 1000 μs}. Knot In the case of Time Division Duplexion U-LTE, the set of values of the first time length includes a set of time lengths of downlink pilot time slots in the TDD LTE system. For another example, the number of OFDM symbols supported by the downlink pilot time slot of the current TDD may be any one of 3, 6, 9, 10, 11, or 12. This method of selecting the time interval between the second time and the start time of the next subframe from a limited set has the advantage of being easy to combine with the prior art and reducing the complexity of the implementation.

Optionally, the foregoing start time of the next subframe is specifically a start time of a next subframe of the last available subframe of the first communications device.

Optionally, when determining the second moment, the first communications device may further determine, according to a time interval between a subframe start time of the first communications device and a subframe start time of the third communications device. The start time of the next subframe, wherein the third communication device may be adjacent to the first communication device. In a specific implementation process, the subframe start times of the first communication device and the third communication device may not be aligned, so that the third communication device may avoid crossing the sub-process during the next competition process in the next competition process. a problem of the start time of the frame, when the first communication device determines the second time, the time interval between the start time of the subframe of the first communication device and the start time of the subframe of the third communication device is also considered. Inside.

In a specific implementation process, optionally, the first communications device detects a synchronization signal and/or a reference signal sent by the third communications device to obtain a subframe boundary of the third communications device.

Before proceeding further, the first subframe start time and the second subframe start time are first defined. The start time of the first subframe is the start time of the next subframe of the last available subframe of the first communications device; the start time of the second subframe is the first subframe. The next third communication device subframe start time at the beginning time, in other words, the second subframe start time is a subframe start time of the third communication device, and the second subframe time is The subframe start time of the first third communication device in the future, which is determined by the start time of the first subframe.

And selecting, according to the relationship between the start time of the first subframe and the start time of the second subframe, the starting time of the next subframe that the second time depends on may include:

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. The beginning time.

If the time interval between the start time of the first subframe and the start time of the second subframe is not less than the length of the contention window, the start time of the next subframe includes the first subframe a start time, or a subframe start time before the second subframe start time of the third communication device.

Optionally, the method of the embodiment of the present invention further includes: the first communications device sends a message to the second communications device, where the message is used to notify the second communications device of the available subframe before the second moment Receive signals within time.

According to the method of the embodiment of the present invention, the timing of releasing the channel in the last available subframe is determined according to the relationship between the length of the contention window and the start time of the next subframe. Due to the second moment, that is, the time interval at which the first communication device releases the channel and the start time of the next subframe is not less than the length of the contention window, the method may enable other communication devices or the first communication device In the next competition, the fallback process does not cross the subframe boundary, thereby avoiding waste of resources due to overfilling in the process of pre-filling the channel. Applying the method of the embodiment of the invention helps to improve resource utilization.

Example 4

The content of Embodiment 3 of the present invention is further described in conjunction with a scenario in the embodiment of the present invention. The scenario includes a third U-LTE communication device; wherein the third U-LTE communication device has a subframe time length of 1 ms. The U-LTE communication device performs a random number-based fallback competition mechanism when competing resources, and the contention window length is 150 μs; the maximum duration of the third U-LTE communication device occupying the channel is 2 subframes; the third U-LTE communication The device has more than 2 subframes to send the signal.

Assuming that the third U-LTE communication device has acquired the transmission resource of the channel for the first time, or will have transmitted a signal on the channel; although the third U-LTE communication device has more than 2 subframes to transmit, it is subject to The maximum duration of the occupied channel is limited to 2 subframes, and the third U-LTE communication device needs to acquire the transmission resources of the channel at least twice before the signal can be sent. Delivery is complete.

The third U-LTE communication device sends a signal after acquiring the transmission resource of the channel for the first time; in the last available subframe, that is, in the second subframe, the channel needs to be released in advance for the next competition. When resources are sent, there is no waste of resources due to overfilling the channel. Specifically, the following steps are included:

Determining, by the third U-LTE communication device, the length of the transmission signal occupied in the last available subframe, that is, the second subframe, according to the length of the contention window of 150 μs and the subframe boundary of the third U-LTE communication device. 1ms-150μs=850μs, that is, a time interval of 150μs from the termination boundary of the last available subframe as the second time; the third U-LTE communication device transmits a signal before the second time, and stops transmitting the signal at the second time .

The third U-LTE communication device releases the channel at a time of 150 [mu]s from its subframe boundary. Since the third U-LTE communication device still has a need to transmit a signal, the third U-LTE communication device continues to contend for the channel. The third U-LTE communication device adopts a method of a contention channel based on a back-off mechanism, and the contention window is 150 μs, and the length of the back-off time is selected in the time range. For the method of the specific back-off, refer to the method of the back-off part in Embodiment 1. Content, no more details here. Since the maximum value of the selected backoff time is not more than 150 μs, when the first communication device competes again for the transmission resource of the channel, the backoff does not cross the subframe boundary, and a padding signal needs to be sent to fill the channel. The time is limited to a smaller range. Through the method of the embodiment of the present invention, the overhead of filling the channel is controlled, and the resource utilization rate is reduced.

The above scenario considers how to delineate the length of the first time only from the perspective of the third U-LTE communication device. Another scenario is shown below, in addition to the third U-LTE communication device, the scenario further includes a fourth U-LTE communication device, wherein the subframe boundary of the fourth U-LTE communication device and the third U-LTE communication device The subframe boundaries are not synchronized, and the length of one subframe is also 1 ms. The fourth U-LTE communication device also generates a request for transmitting a signal during the first time that the third U-LTE communication device transmits a signal.

Assume that the competition window length is 150 μs, when the third U-LTE communication device is first transmitted After the resource, the time at which the channel is released in the last available subframe is determined according to the length of the contention window. In the embodiment of the present invention, the third U-LTE communication device determines according to the length of the contention window and the time interval between the subframe boundary of the third U-LTE communication device and the subframe boundary of the fourth U-LTE communication device. At the second moment, a certain method includes:

As shown in FIG. 4, if the subframe boundary b _{3 of} the third U-LTE communication device is b ₃ = 1000 μs and the time interval b ₄ between the subframe boundary b ₄ = 1600 μs of the next fourth U-LTE communication device - When b ₃ = 600 μs is not less than the length t _CW = 150 μs of the contention window, the start time of the previous subframe of b ₄ of the fourth U-LTE communication device may be used as the next subframe for selecting the second time. The starting time, that is, the time during which the third U-LTE communication device transmits a signal in its last available subframe is not greater than 1000-(1000-600)-150=450 μs; it may also be communicated in a third U-LTe The b _{3 of the} device is used as the start time of the next subframe to select the second time. Both of these options can avoid the problem that the fourth U-LTE communication device crosses its next subframe boundary b ₄ during the fallback process.

As shown in FIG. 5, if the subframe boundary b ₃ = 1000 μs of the third U-LTE communication device is shown and the time interval b ₄ between the subframe boundary b ₄ =1100 μs of the next fourth U-LTE communication device is ₄ - When b ₃ = 100 μs is smaller than the length t _CW = 150 μs of the contention window, b _{4 of the} fourth U-LTE communication device is used as the next subframe start time for selecting the second time μs. This option avoids the fourth U-LTE communication device issues across its next subframe boundary b ₄ appears in the fallback procedure.

After determining the second moment, the third U-LTE communication device transmits a signal before the second moment and releases the channel at the second moment. After the channel is idle, the third U-LTE communication device and the fourth U-LTE communication device compete for a transmission resource, and the method for competing resources is similar to the foregoing backoff-based contention resource method, where It is to be noted that the fourth U-LTE communication device does not cross the subframe boundary of the fourth U-LTE communication device during the fallback process, thereby avoiding excessive transmission of the padding signal to occupy the channel. The problem has improved resource utilization.

According to the method of the embodiment of the present invention, the timing of releasing the channel in the last subframe that can be occupied is determined according to the relationship between the length of the contention window and the subframe boundary. Due to the second time The time interval between the time when the first communication device releases the channel and the start time of the next subframe is not less than the length of the contention window, and the method may enable the communication device to skip the next time in the competition. The sub-frame boundary avoids the waste of resources due to over-filling during the early filling of the channel. Applying the method of the embodiment of the invention helps to improve resource utilization.

Example 5

The embodiment of the present invention provides a method for competing resources, and the method may correspond to the method for transmitting a signal proposed in Embodiment 3 of the present invention. The first communication device and the third communication device mentioned in the embodiments of the present invention are devices having fixed subframe boundaries, and the communication device includes but is not limited to a U-LTE cell base station, an evolved U-LTE cell base station, and a U-LTE terminal. The device, the evolved U-LTE terminal device, the terminal device with the Wi-Fi function, and the like, the embodiment of the present invention refers to the first communication device and the third communication device may be the same device, or may be different devices. Figure 6 shows the steps of an embodiment of the present invention, the steps including:

Step 601: The third communication device detects that the channel is idle in the second time;

In a specific implementation process, optionally, the second moment is a moment when the first communications device releases the channel in its last available subframe. The first communication device occupies a channel before the second time. The first communication device determines the second moment according to a width of a contention window and a start time of a next subframe, and a time interval between the second moment and a start time of a next subframe is not less than the The length of the competition window; optionally, the set of values of the time interval between the second time and the start time of the next subframe includes a set of time lengths of the downlink pilot time slots, and the set may be in TDD In the U-LTE system.

In a specific implementation process, the third communication device selects a backoff time length according to the length of the contention window. Specifically, the third communication device randomly selects the length of the backoff time within the length of the contention window. Because the contention window length is not greater than the second time and the next subframe The time interval between the start times, therefore, when the third communication device selects the backoff time length and sequentially performs the rollback, the end time of the rollback process will be before the start time of the next subframe. Thus, the situation of crossing the sub-frame boundary is avoided, thereby avoiding the situation that the channel is excessively pre-filled in order to occupy the channel due to crossing the sub-frame boundary.

Optionally, in a specific implementation process, if the third communication device is synchronized with the subframe boundary of the first communication device, or the third communication device and the first communication device are the same device, the start time of the next subframe may be Is the start time of the next subframe of the last available subframe of the first communication device, in which case the third communication device does not cross the next time when selecting the backoff time length and performing the rollback The start time of a sub-frame.

Selecting the second according to the relationship between the start time of the first subframe and the start time of the second subframe The starting time of the next subframe on which the time depends may include:

Step 602: The third communications device determines whether to occupy the channel according to a result of the CCA within the length of the backoff time.

Optionally, determining, according to the CCA result in the length of the backoff time, determining whether to occupy the channel includes: detecting the channel, if the channel is idle during the backoff time, then in the next sub Before the start time of the frame arrives, the transmit fill signal occupies the channel; optionally, if the channel is occupied during the backoff time, the channel is not occupied.

Specifically, the method for determining whether to occupy the channel according to the CCA result in the backoff time is the same as the method in step 102 in Embodiment 1 of the present invention, and details are not described herein.

According to the method of the embodiment of the present invention, the third communication device detects that the channel transitions to idle at the second moment, and selects the backoff time length according to the length of the contention window, and contends for channel resources. Since the second moment is related to the length of the contention window and the start time of the next subframe, the third communication device does not cross the next subframe boundary during the backoff process, thereby avoiding the backoff time. The case where the sum of the padding times exceeds one sub-frame length occurs, thereby improving resource utilization.

Example 6

The embodiment of the invention provides a method for receiving a message, and the method may correspond to a method for competing resources proposed in Embodiment 3 of the present invention. The first communication device and the third communication device mentioned in the embodiments of the present invention are devices having fixed subframe boundaries, and the communication device includes but is not limited to a U-LTE cell base station, an evolved U-LTE cell base station, and a U-LTE terminal. Equipment, evolved U-LTE terminal The device, the Wi-Fi-enabled terminal device, and the like, the first communication device and the third communication device may be the same device, or may be different devices. The second communication device mentioned in the embodiment of the present invention Is a device that transmits communication with the first communication device. Figure 7 shows the steps of an embodiment of the invention, the steps comprising:

Step 701: The second communications device receives the message sent by the first communications device.

Step 702: The second communications device determines a second moment according to the message, where the second moment is a moment when the first communications device releases a channel in its last available subframe;

Step 703: The second communications device receives a signal in the last available subframe according to the second moment.

Optionally, in a specific implementation process, the next subframe start time is specifically a start time of the next subframe of the last available subframe of the first communications device; or

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. The beginning time; or

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the first subframe. Starting time

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.

Optionally, the set of values of the time interval between the second time and the start time of the next subframe includes a set of time lengths of the downlink pilot time slots.

According to the method proposed by the embodiment, the second communication device is in accordance with a message sent by the first communication device, in an available subframe time of the first communication device, in particular, the most The message is received within a time before the second time of the last available subframe. The method provided by the embodiment of the present invention can correctly receive information before the second moment, and does not affect the advantage of the first communication device to improve resource utilization.

Example 7

The embodiment of the present invention provides a device for competing resources, and the device provided by the embodiment of the present invention can be used to implement the method for competing resources proposed in Embodiment 1 of the present invention.

FIG. 8 is a structural diagram of a device for competing resources according to an embodiment of the present invention, where the device includes:

The processor 801 is configured to determine a length of the backoff time;

The transceiver 802 is configured to detect a channel within the length of the backoff time to obtain a channel detection result;

The first moment is a moment when the device that competes for resources releases the channel.

Optionally, the first time is determined by the channel being transferred to the idle time, where the first time is specifically a time when the channel is idle, or the channel is idle and delayed. The time after the inter-frame gap IFS.

Optionally, the moment that the device that is the contention resource releases the channel includes: the transceiver is configured to continuously send a signal in an available subframe time before the first moment; the first The time interval between the time distance and the start time of the next subframe is not less than the length of the contention window.

Optionally, the determining, by the processor, the length of the backoff time according to the time interval between the first time and the start time of the next subframe includes: the processor is configured to use the first communication time to the next subframe. a time interval between the start time, determining a value range of the backoff time length; the processor is further configured to randomly select the back time length within a value range of the backoff time length; The upper limit of the value range of the backoff time length is not greater than the time interval.

Optionally, the processor is further configured to determine, according to the result of the channel detection, whether to occupy the channel: if the channel is idle during the backoff time, the transceiver is used to Before the start time of a frame arrives, the transmit padding signal occupies the channel; if the channel is occupied within the backoff time length, the channel is not occupied.

The method for de-competing resources according to the embodiment of the present invention has been described in detail in Embodiment 1 of the present invention, and details are not described herein again.

The device according to the embodiment of the present invention determines the backoff time length according to the time interval between the first time and the start time of the next subframe when the resource is contending, and the back time length is not greater than the time interval. . The device according to the embodiment of the present invention can complete the rollback before the start time of the next subframe, and avoids the possibility of crossing the start time of the subframe in the backoff process, so that the backoff time and the time for sending the padding signal are not More than one sub-frame length. With the apparatus of the present embodiment, resource utilization can be improved for communication having a fixed subframe boundary.

Example 8

The embodiment of the present invention provides a device for transmitting a signal, and the device provided by the embodiment of the present invention can be used to implement a method for transmitting a signal according to Embodiment 3 of the present invention.

FIG. 9 is a structural diagram of the apparatus for transmitting a signal according to an embodiment of the present invention. The apparatus includes a processor 901 and a transceiver 902:

The processor 901 is configured to control the transceiver 902 to continuously send a signal in a available subframe time before the second moment;

The processor 901 is further configured to control the transceiver 902 to release the channel at the second moment;

The second time is in a last available subframe of the device that sends the signal; the time interval between the second time and the start time of the next subframe is not less than the length of the contention window.

Optionally, the next subframe start time is specifically the last one of the devices that send the signal. The start time of the next subframe of the available subframe.

In a specific implementation, if the first subframe start time is the next subframe start time of the last available subframe of the device that sends the signal; the second subframe start time is The next third communication device subframe start time at the start time of the first subframe. Then there are:

Optionally, if the time interval between the start time of the first subframe and the start time of the second subframe is less than the length of the contention window, the start time of the next subframe includes the The start time of the two subframes;

Optionally, if the time interval between the start time of the first subframe and the start time of the second subframe is not less than the length of the contention window, the start time of the next subframe includes the The first subframe start time.

Optionally, the transceiver is further configured to send a message to the second communications device, where the message is used to notify the second communications device to receive the time before the second moment of the last available subframe. signal.

According to the apparatus of the embodiment of the present invention, the timing of releasing the channel in the last available subframe is determined according to the relationship between the length of the contention window and the start time of the next subframe. Due to the second moment, that is, the time interval at which the device releases the channel from the start time of the next subframe is not less than the length of the contention window, this method may cause other communication devices or the device to compete in the next competition. The fallback process does not cross the subframe boundaries, thereby avoiding waste of resources due to overfilling in the process of pre-filling the channel. The apparatus to which the embodiments of the present invention are applied contributes to an improvement in resource utilization.

Example 9

The embodiment of the present invention provides a device for competing resources, and the device provided by the embodiment of the present invention can be used to implement the method for competing resources proposed in Embodiment 5 of the present invention.

FIG. 10 is a structural diagram of the apparatus for transmitting a signal according to an embodiment of the present invention. The apparatus includes a processor 1001 and a transceiver 1002:

The transceiver 1002 is configured to detect that the channel transits to idle at a second moment;

The transceiver 1002 is further configured to detect a channel within a length of a backoff time to obtain a detection result;

Optionally, the second moment is a moment when the first communications device releases the channel in its last available subframe.

Optionally, the next subframe start time is specifically a start time of a next subframe of the last available subframe of the first communications device.

In a specific implementation, if the first subframe start time is the next subframe start time of the last available subframe of the first communications device; the second subframe start time is a subframe start time of the next device of the contention resource at the start time of the first subframe. Then there are:

Optionally, the processor is further configured to determine, according to the result of the detecting, whether to occupy the channel: if the channel is idle during the backoff time, the transceiver is used in the next Before the start time of the frame arrives, the transmit padding signal occupies the channel; if the channel is occupied within the backoff time length, the channel is not occupied.

According to the apparatus of the embodiment of the present invention, when the transceiver detects that the channel is idle at the second moment, and selects the backoff time length according to the length of the contention window, and contends for channel resources. Since the second time is related to the length of the contention window and the start time of the next subframe, the device of the contention resource does not cross the next subframe boundary during the rollback process, thereby avoiding the backoff time. The case where the sum of the padding times exceeds one sub-frame length occurs, thereby improving resource utilization.

Example 10

The embodiment of the present invention provides a device for receiving a signal, and the device provided by the embodiment of the present invention can be used to implement the method for receiving a signal according to Embodiment 6 of the present invention.

FIG. 11 is a structural diagram of an apparatus for transmitting a signal according to an embodiment of the present invention. The apparatus includes a processor 1101 and a receiver 1102:

The receiver 1102 is configured to receive a message sent by the first communications device.

The processor 1101 is configured to determine a second moment according to the message, where the second moment is a moment when the first communications device releases a channel in its last available subframe;

The receiver 1102 is further configured to receive a signal in the last available subframe according to the second moment;

Optionally, the next subframe start time is specifically a next subframe start time of the last available subframe of the first communications device;

In a specific implementation, the first subframe start time is a next subframe start time of the last available subframe of the first communications device; the second subframe start time is The next third communication device subframe start time at the start time of the first subframe. Then there are:

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. Starting time or

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the first subframe. The beginning time.

An apparatus according to an embodiment, the apparatus according to a message sent by the first communication device, during an available subframe time of the first communication device, in particular a second of a last available subframe of the first communication device Receive a message before the time. The apparatus provided by the embodiment of the present invention can correctly receive information before the second moment, and does not affect the advantage that the first communication device improves resource utilization.

Example 11

FIG. 12 is a structural diagram of a device for competing resources according to an embodiment of the present invention, where the device includes:

The first determining module 1201 is configured to determine a length of the backoff time;

The detecting module 1202 is configured to detect a channel according to the back-off time, and obtain a detection result.

Optionally, the first moment is a moment when the device that contends for the resource releases the channel, and the device further includes: a sending module, where the device for competing resources is before the first moment The signal may be continuously transmitted in a subframe time; the time interval between the first moment and the start time of the next subframe is not less than the length of the contention window.

Optionally, the determining, by the first determining module, the length of the backoff time according to the time interval between the first time and the start time of the next subframe includes: a second determining module, configured to use the first communication time to the next time a time interval between the start time of the subframe, determining a value range of the backoff time length; and a selecting module, configured to randomly select the back time length within a value range of the backoff time length; The upper limit of the value range of the backoff time length is not greater than the time interval.

Optionally, the device for competing resources further includes a third determining module, configured to determine, according to the detection result, whether to occupy the channel, and a sending module, if the channel is idle during the backoff time, For transmitting a padding signal to occupy the channel before the start time of the next subframe arrives.

Optionally, the sturdy man of the contending resource further includes a third determining module, configured to determine, according to the detection result, whether to occupy the channel; if the channel is occupied during the retreat time, the device does not occupy The channel.

Optionally, the apparatus according to the embodiment of the present invention includes a communication device having a fixed subframe boundary.

Example 12

The embodiment of the present invention provides a device for receiving a signal, and the device provided by the embodiment of the present invention can be used to implement the method for transmitting a signal according to Embodiment 3 of the present invention.

FIG. 13 is a structural diagram of a device for transmitting a signal according to an embodiment of the present invention, where the device is configured include:

The first sending module 1301 is configured to continuously send a signal in a available subframe time before the second moment;

a release module 1302, configured to release the channel at the second moment;

Optionally, the next subframe start time is specifically the next subframe start time of the last available subframe of the device that sends the signal.

In a specific implementation, if the first subframe start time is the next subframe start time of the last available subframe of the device for transmitting the signal, the second subframe start time is The next third communication device subframe start time at the start time of the first subframe. Then there are:

If the time interval between the start time of the first subframe and the start time of the second subframe is not less than the length of the contention window, the start time of the next subframe includes the first subframe Initial time

engraved.

Optionally, the device further includes a second sending module, configured to send a message to the second communications device, where the message is used to notify the second communications device at the second moment of the last available subframe Receive signal in the previous time

According to the apparatus of the embodiment of the present invention, the timing of releasing the channel in the last available subframe is determined according to the relationship between the length of the contention window and the start time of the next subframe. Due to the second moment, that is, the time interval at which the device releases the channel from the start time of the next subframe is not less than the length of the contention window, this method may cause other communication devices or the device to In the next competition, the fallback process does not cross the subframe boundary, thus avoiding the waste of resources caused by overfilling in the process of pre-filling the channel. The apparatus to which the embodiments of the present invention are applied contributes to an improvement in resource utilization.

Example 13

FIG. 14 is a structural diagram of a device for competing resources according to an embodiment of the present invention, where the device includes:

The first detecting module 1401 is configured to detect that the channel is idle during the second time;

The second detecting module 1402 is configured to detect a channel within a length of the backoff time, and obtain a detection result;

Optionally, the set of values of the time interval between the second time and the start time of the next subframe includes: a set of time lengths of the downlink pilot time slots.

Optionally, if the time interval between the start time of the first subframe and the start time of the second subframe is not less than the length of the contention window, the start time of the next subframe includes the First subframe start time;

Optionally, the device further includes: a determining module, configured to determine, according to the detection result, whether to occupy the channel; and a sending module, if the channel is idle during the backoff time, The transmit fill signal occupies the channel before the start time of the next subframe arrives.

Optionally, the device further includes a determining module, configured to determine, according to the detection result, whether to occupy the channel; if the channel is occupied during the backoff time, the channel is not occupied.

Optionally, the determining module includes a channel detecting module and a sending module, where the channel detecting module is configured to detect the channel; if the channel is idle during the backing time, the sending module is used to: Before the arrival of the start time of the next subframe, the transmit padding signal occupies the channel; if the channel is occupied during the backoff time, the channel is not occupied.

Example 14

FIG. 15 is a structural diagram of the apparatus for receiving a signal according to an embodiment of the present invention, where the apparatus includes:

The first receiving module 1501 is configured to receive a message sent by the first communications device.

The determining module 1502 determines a second moment according to the message, where the second moment is a moment when the first communications device releases a channel in its last available subframe;

The second receiving module 1503 is configured to receive a signal in the last available subframe according to the second moment;

Optionally, the next subframe start time is specifically a next subframe start time of the last available subframe of the first communications device.

Optionally, if the time interval between the start time of the first subframe and the start time of the second subframe is less than the length of the contention window, the start time of the next subframe includes the The start time of the second subframe; or

Optionally, if the time interval between the start time of the first subframe and the start time of the second subframe is less than the length of the contention window, the start time of the next subframe includes the The start time of a sub-frame.

Those of ordinary skill in the art will appreciate that various aspects of the present invention, or possible implementations of various aspects, may be embodied as a system, method, or computer program product. Thus, aspects of the invention, or possible implementations of various aspects, may be implemented in an entirely hardware embodiment. All software embodiments (including firmware, resident software, etc.), or a combination of software and hardware aspects, are collectively referred to herein as "circuits," "modules," or "systems." Furthermore, aspects of the invention, or possible implementations of various aspects, may take the form of a computer program product, which is a computer readable program code stored in a computer readable medium.

The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium includes, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing, such as random access memory (RAM), read only memory (ROM), Erase programmable read-only memory (EPROM or flash memory), optical fiber, portable read-only memory (CD-ROM).

The processor in the computer reads the computer readable program code stored in the computer readable medium such that the processor is capable of performing the various functional steps specified in each step of the flowchart, or a combination of steps; A device that functions as specified in each block, or combination of blocks.

The computer readable program code can execute entirely on the user's computer, partly on the user's computer, as a separate software package, partly on the user's computer and partly on the remote computer, or entirely on the remote computer or server. . It should also be noted that in some alternative implementations, the functions noted in the various steps in the flowcharts or in the blocks in the block diagrams may not occur in the order noted. For example, two steps, or two blocks, shown in succession may be executed substantially concurrently or the blocks may be executed in the reverse order.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

A method of competing for resources, characterized by comprising:

The first communication device determines a length of the backoff time;

Detecting a channel within the length of the backoff time, and obtaining a detection result;

The backoff time length is not greater than a time interval between the first time and the start time of the next subframe;

Wherein the first moment is determined by the channel transitioning to an idle moment; or

The first moment is a moment when the first communication device releases the channel.
The method according to claim 1, wherein the determining that the first time is determined by a channel transition to an idle time comprises:

The first time is specifically a time when the channel transits to idle; or specifically, the time after the channel transitions to idle and delays the inter-frame gap IFS.
The method according to claim 1, wherein the first moment is when the first communication device releases the channel:

The first communication device continuously transmits a signal in an available subframe time before the first moment;

The time interval between the first time and the start time of the next subframe is not less than the length of the contention window.
The method according to any one of claims 1 to 3, wherein the determining, by the first communication device, the length of the backoff time according to the time interval between the first time and the start time of the next subframe comprises:

Determining, according to a time interval between the first communication time and the start time of the next subframe, a value range of the backoff time length;

The length of the backoff time is randomly selected within a range of values of the length of the backoff time;

The upper limit of the value range of the backoff time length is not greater than the time interval.
The method according to any one of claims 1 to 4, further comprising:

Determining whether to occupy the channel according to the detection result;

If the channel is always idle during the backoff time, the transmit fill signal occupies the channel before the start time of the next subframe arrives.
The method according to any one of claims 1 to 4, further comprising:

Determining whether to occupy the channel according to the detection result;

If the channel is occupied during the backoff time, the channel is not occupied.
Method according to any of claims 1 to 6, characterized in that the method is applied to a communication device having a fixed subframe boundary.
A method for transmitting a signal, comprising:

The first communication device continuously transmits a signal in an available subframe time before the second moment;

The first communication device releases the channel at the second moment;

The second moment is in a last available subframe of the first communications device; a time interval between the second moment and a starting moment of a next subframe is not less than a length of a contention window.
The method according to claim 8, wherein the next subframe start time is specifically the next subframe start time of the last available subframe of the first communication device.
The method of claim 8 wherein:

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. Starting time

The first subframe start time is the last available subframe of the first communications device. The start time of the next subframe;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.
The method of claim 8 wherein:

If the time interval between the start time of the first subframe and the start time of the second subframe is not less than the length of the contention window, the start time of the next subframe includes the first subframe Starting time

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.
The method according to any one of claims 8 to 11, wherein the set of values of the time interval between the second time instant and the start time of the next subframe comprises:

A set of time lengths of downlink pilot slots.
The method according to any one of claims 8 to 12, wherein the first communication device sends a message to the second communication device, the message being used to notify the second communication device of the last available child A signal is received within a time prior to the second time of the frame.
A method of competing for resources, characterized by comprising:

The third communication device detects that the channel transitions to idle at the second moment;

The third communication device detects a channel within the length of the backoff time, and obtains a detection result;

The length of the backoff time is determined by the length of the contention window;

The time interval between the second moment and the start time of the next subframe is not less than the length of the contention window.
The method of claim 14 wherein said second time instant is when said first communication device releases a channel in its last available subframe.
The method according to any one of claims 14 to 15, wherein the set of values of the time interval between the second time instant and the start time of the next subframe comprises:

A set of time lengths of downlink pilot slots.
The method according to any one of claims 14 to 16, wherein the next subframe start time is specifically a start time of a next subframe of a last available subframe of the first communication device.
A method according to any one of claims 14 to 16, wherein

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. Starting time

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.
A method according to any one of claims 14 to 16, wherein

If the time interval between the start time of the first subframe and the start time of the second subframe is not less than the length of the contention window, the start time of the next subframe includes the first subframe Starting time

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is the next one of the first subframe start time The starting time of the three communication device subframes.
The method according to any one of claims 14 to 19, further comprising:

Determining whether to occupy the channel according to the detection result;

If the channel is always idle during the backoff time, the transmit fill signal occupies the channel before the start time of the next subframe arrives.
The method according to any one of claims 14 to 19, further comprising:

Determining whether to occupy the channel according to the detection result;

If the channel is occupied during the backoff time, the channel is not occupied.
A method for receiving a signal, comprising:

Receiving, by the second communications device, a message sent by the first communications device;

Determining, by the second communications device, a second time instant according to the message, wherein the second time instant is a time when the first communications device releases a channel in its last available subframe;

The second communication device receives a signal in the last available subframe according to the second moment;

The time interval between the second moment and the start time of the next subframe is not less than the length of the contention window.
The method according to claim 22, wherein the next subframe start time is specifically the next subframe start time of the last available subframe of the first communication device; or

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. The beginning time; or

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the first subframe. Starting time

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.
The method according to any one of claims 23 or 24, wherein the set of values of the time interval between the second time instant and the start time of the next subframe comprises:

A set of time lengths of downlink pilot slots.
A device for competing resources, comprising a processor and a transceiver, wherein:

The processor is configured to determine a length of a backoff time;

The transceiver is configured to detect a channel within the length of the backoff time to obtain a channel detection result;

The backoff time length is not greater than a time interval between the first time and the start time of the next subframe;

Wherein the first moment is determined by the channel transitioning to an idle moment; or

The first moment is a moment when the device that contends for the resource releases the channel.
The apparatus according to claim 25, wherein said first time is determined by a channel transition to an idle time comprises:

The first time is specifically a time when the channel transits to idle; or specifically, the time after the channel transitions to idle and delays the inter-frame gap IFS.
The apparatus according to claim 25, wherein the moment when the first moment is that the device that contends for the resource releases the channel comprises:

The transceiver is configured to continuously send a signal during an available subframe time before the first moment;

The time interval between the first time and the start time of the next subframe is not less than the length of the contention window.
The device according to any one of claims 25 to 27, wherein the determining, by the processor, the length of the backoff time according to the time interval between the first time and the start time of the next subframe comprises:

The processor is configured to determine a value range of the backoff time length according to a time interval between the first communication time and a start time of the next subframe;

The processor is further configured to randomly select the backoff time length within a range of values of the backoff time length;

The upper limit of the value range of the backoff time length is not greater than the time interval.
The device according to any one of claims 25 to 28, wherein the processor is further configured to determine whether to occupy the channel according to a result of the channel detection;

If the channel is idle for the length of the backoff time, the transceiver is configured to send a fill signal to occupy the channel before the start time of the next frame arrives.
The device according to any one of claims 25 to 28, wherein the processor is further configured to determine whether to occupy the channel according to a result of the channel detection;

If the channel is occupied within the length of the backoff time, the channel is not occupied.
A device for transmitting a signal, comprising: a processor and a transceiver:

The processor is configured to control the transceiver to continuously send a signal in a available subframe time before the second moment;

The processor is further configured to control the transceiver to release the channel at the second moment;

The second moment is in a last available subframe of the apparatus for transmitting a signal; a time interval between the second moment and a start time of a next subframe is not less than a length of a contention window.
The apparatus according to claim 31, wherein the next subframe start time is specifically the next subframe start time of the last available subframe of the apparatus for transmitting the signal.
The device of claim 31 wherein:

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. Starting time

The first subframe start time is a next subframe start time of the last available subframe of the device that sends the signal;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.
The device according to claim 31, wherein

If the time interval between the start time of the first subframe and the start time of the second subframe is not less than the length of the contention window, the start time of the next subframe includes the first subframe Starting time

The first subframe start time is a next subframe start time of the last available subframe of the device that sends the signal;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.
The device according to any one of claims 31 to 34, wherein the set of values of the time interval between the second time instant and the start time of the next subframe comprises:

A set of time lengths of downlink pilot slots.
The apparatus according to any one of claims 31 to 35, wherein said transceiver is further configured to send a message to said second communication device, said message being used to notify said second communication device that said last one is available A signal is received within a time period prior to the second time of the subframe.
A device for competing resources, comprising a processor and a transceiver, wherein:

The transceiver is configured to detect that the channel transits to idle at a second moment;

The transceiver is further configured to detect a channel within a length of the backoff time to obtain a detection result;

The length of the backoff time is determined by the processor according to a length of the contention window;

The time interval between the second moment and the start time of the next subframe is not less than the length of the contention window.
The apparatus of claim 37, wherein the second time instant is a time at which the first communication device releases the channel in its last available subframe.
The device according to any one of claims 37 to 38, wherein the set of values of the time interval between the second time instant and the start time of the next subframe comprises:

A set of time lengths of downlink pilot slots.
The apparatus according to any one of claims 37 to 39, wherein the next subframe start time is specifically a start time of a next subframe of a last available subframe of the first communication device.
The method according to any one of claims 37 to 39, wherein if the time interval between the start time of the first subframe and the start time of the second subframe is less than the length of the contention window, the next The start time of a subframe includes the start time of the second subframe;

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is a subframe start time of the next device of the contention resource at the start time of the first subframe.
A device according to any one of claims 37 to 39, wherein

If the time interval between the start time of the first subframe and the start time of the second subframe is not less than the competition a start time of the next subframe, where the start time of the next subframe includes the start time of the first subframe;

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is a subframe start time of the next device of the contention resource at the start time of the first subframe.
The device according to any one of claims 37 to 42, wherein the processor is further configured to determine whether to occupy the channel according to the result of the detecting;

If the channel is idle for the length of the backoff time, the transceiver is configured to send a fill signal to occupy the channel before the start time of the next frame arrives.
The device according to any one of claims 37 to 42, wherein the processor is further configured to determine whether to occupy the channel according to the result of the detecting;

If the channel is occupied within the length of the backoff time, the channel is not occupied.
A device for receiving a signal, comprising: a processor and a receiver:

The receiver is configured to receive a message sent by the first communications device;

The processor is configured to determine a second moment according to the message, where the second moment is a moment when the first communications device releases a channel in its last available subframe;

The receiver is further configured to receive a signal in the last available subframe according to the second moment;

The time interval between the second moment and the start time of the next subframe is not less than the length of the contention window.
The apparatus according to claim 45, wherein the next subframe start time is specifically the next subframe start time of the last available subframe of the first communication device; or

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. The beginning time; or

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the first subframe. Starting time

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.
The method according to any one of claims 45 or 46, wherein the set of values of the time interval between the second time instant and the start time of the next subframe comprises:

A set of time lengths of downlink pilot slots.
A device for competing resources, characterized in that it comprises:

a first determining module, configured to determine a length of the backoff time;

a detecting module, configured to detect a channel in the back-off time, and obtain a detection result;

The backoff time length is not greater than a time interval between the first time and the start time of the next subframe;

Wherein the first moment is determined by the channel transitioning to an idle moment; or

The first moment is a moment when the device that contends for the resource releases the channel.
The apparatus according to claim 48, wherein said first time is determined by a channel transition to an idle time comprises:

The first time is specifically a time when the channel transits to idle; or specifically, the time after the channel transitions to idle and delays the inter-frame gap IFS.
The device according to claim 48, wherein the first moment is a moment when the device competing for the resource releases the channel, the device further comprising:

a sending module, where the device for the contention resource continuously sends a signal in an available subframe time before the first moment;

The time interval between the first time and the start time of the next subframe is not less than the length of the contention window.
The device according to any one of claims 48 to 50, wherein the first determining module comprises a second determining module and a selecting module, wherein

The second determining module is configured to determine a value range of the backoff time length according to a time interval between the first communication time and the start time of the next subframe;

The selection module is used to select a range of the backoff time length, and randomly select the backoff time length;

The upper limit of the value range of the backoff time length is not greater than the time interval.
The device according to any one of claims 48 to 51, further comprising:

a third determining module, configured to determine, according to the detection result, whether to occupy the channel;

And a sending module, if the channel is always idle during the backoff time, for sending a padding signal to occupy the channel before the start time of the next subframe arrives.
The device according to any one of claims 48 to 51, further comprising:

a third determining module, configured to determine, according to the detection result, whether to occupy the channel;

If the channel is occupied during the backoff time, the channel is not occupied.
Apparatus according to any of claims 48 to 53, wherein said apparatus comprises communication means having fixed subframe boundaries.
A device for transmitting a signal, comprising:

a first sending module, configured to continuously send a signal in a available subframe time before the second moment;

a release module, configured to release the channel at the second moment;

The second moment is in a last available subframe of the first communications device; a time interval between the second moment and a starting moment of a next subframe is not less than a length of a contention window.
The apparatus according to claim 55, wherein the next subframe start time is specifically the next subframe start time of the last available subframe of the apparatus for transmitting the signal.
The device of claim 55 wherein:

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. Starting time

The first subframe start time is a next subframe start time of the last available subframe of the device that sends the signal;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.
The device of claim 55, wherein

If the time interval between the start time of the first subframe and the start time of the second subframe is not less than the length of the contention window, the start time of the next subframe includes the first subframe Starting time

The first subframe start time is a next subframe start time of the last available subframe of the device that sends the signal;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.
Apparatus according to any one of claims 55 to 58, wherein said second moment The set of values of the time interval between the start times of the next subframe includes:

A set of time lengths of downlink pilot slots.
The device according to any one of claims 55 to 59, further comprising a second transmitting module for transmitting a message to the second communication device, the message being used to notify the second communication device at the last A signal is received within a time period prior to the second time of an available subframe.
A device for competing resources, characterized in that it comprises:

a first detecting module, configured to detect that the channel is idle during the second time;

a second detecting module, configured to detect a channel within a length of the backoff time, and obtain a detection result;

The length of the backoff time is determined by the length of the contention window;

The time interval between the second moment and the start time of the next subframe is not less than the length of the contention window.
The apparatus of claim 61 wherein said second time instant is when said first communication device releases a channel in its last available subframe.
The apparatus according to any one of claims 61 to 62, wherein the set of values of the time interval between the second time instant and the start time of the next subframe comprises:

A set of time lengths of downlink pilot slots.
The apparatus according to any one of claims 61 to 63, wherein the next subframe start time is specifically a start time of a next subframe of a last available subframe of the first communication device.
A device according to any one of claims 61 to 63, wherein

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. Starting time

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is a subframe start time of the next device of the contention resource at the start time of the first subframe.
A device according to any one of claims 61 to 63, wherein

If the time interval between the start time of the first subframe and the start time of the second subframe is not less than the length of the contention window, the start time of the next subframe includes the first subframe Starting time

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is a subframe start time of the next device of the contention resource at the start time of the first subframe.
The device according to any one of claims 61 to 66, further comprising:

a determining module, configured to determine, according to the detection result, whether to occupy the channel;

And a sending module, if the channel is always idle during the backoff time, for sending a padding signal to occupy the channel before the start time of the next subframe arrives.
The device according to any one of claims 61 to 66, further comprising:

a determining module, configured to determine, according to the detection result, whether to occupy the channel;

If the channel is occupied during the backoff time, the channel is not occupied.
A device for receiving a signal, comprising:

a first receiving module, configured to receive a message sent by the first communications device;

Determining a module, determining a second time according to the message, wherein the second time is a time when the first communication device releases a channel in its last available subframe;

a second receiving module, configured to receive a signal in the last available subframe according to the second moment;

The time interval between the second moment and the start time of the next subframe is not less than the length of the contention window.
The apparatus according to claim 69, wherein the next subframe start time is specifically the next subframe start time of the last available subframe of the first communication device; or

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the second subframe. The beginning time; or

If the time interval between the start time of the first subframe and the start time of the second subframe is smaller than the length of the contention window, the start time of the next subframe includes the first subframe. Starting time

The first subframe start time is a next subframe start time of the last available subframe of the first communications device;

The second subframe start time is the next third communication device subframe start time of the first subframe start time.
The device according to any one of claims 69 or 70, wherein the set of values of the time interval between the second time instant and the start time of the next subframe comprises:

A set of time lengths of downlink pilot slots.