CN105338652B - Channel detection method and device based on competition window - Google Patents
Channel detection method and device based on competition window Download PDFInfo
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- CN105338652B CN105338652B CN201510624067.7A CN201510624067A CN105338652B CN 105338652 B CN105338652 B CN 105338652B CN 201510624067 A CN201510624067 A CN 201510624067A CN 105338652 B CN105338652 B CN 105338652B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
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- H—ELECTRICITY
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Abstract
The present invention provides a kind of channel detection method and device based on competition window, wherein the channel detection method based on competition window, comprising: determine the value of competition window；When starting ECCA channel detection process, random number is chosen according to the value of the competition window, and Channel Detection is carried out based on the random number；When being determined to occupy the channel, data are sent by the channel.Technical solution of the present invention, which realizes, is according to the actual situation neatly adjusted the value of competition window, the value for effectively preventing competition window is too small and causes to collide, the problem of increasing transmission delay since the value of competition window is excessive is also avoided, the handling capacity for promoting channel utilization and system is conducive to.
Description
Technical field
The present invention relates to field of communication technology, in particular to a kind of channel detection method based on competition window and
A kind of Channel Detection device based on competition window.
Background technique
Currently, 3GPP proposes the concept of LAA (access of LTE Assisted Access, LTE auxiliary), for by LTE
The help of authorization frequency spectrum comes using unlicensed spectrum.And LTE (Long Term Evolution, long term evolution) network is using
When unauthorized frequency range, one of most important key point is to ensure that LAA can be on the basis of fair friendly and existing access skill
Art (such as Wi-Fi) coexists.And there is no the mechanism of LBT (Listen Before Talk, listem-before-talk) in traditional LTE system
It avoids collision, in order to preferably coexist with Wi-Fi, LTE system needs a kind of LBT mechanism.In this way, LTE is in unlicensed spectrum
If upper detect channel busy, the frequency range cannot be occupied, if detecting the channel spare time, could be occupied.
Based on the above issues, it proposes in the related technology a kind of based on LBE (Load based equipment, based on negative
The equipment of load) LBT mechanism, the LBT mechanism based on LBE is no periodic as shown in Figure 1:, as long as business reach, trigger
CCA detection sends signaling or data if CCA detection is idle at once；If detecting channel busy, a random number N, N are taken
Value range be 1 arrive q, wherein q is the length of competition window, and value range is 4 to 32.Fig. 1 shows the feelings of q=16
Condition, at this point, channel maximum holding time is (13/32) × q=6.5ms when detecting channel idle.After 6.5ms, adopt
ECCA (i.e. Extended CCA) mechanism is taken, i.e., and the range of random value N, N are 1 to q, if value is 8, then it represents that connecing
In the continuous CCA detection time got off, each CCA detection time will detect channel, if detecting channel idle, N-1,
If detecting channel busy, N is constant, when N is 0, sends signaling or data.
In addition, in order to further with Wi-Fi keep fairness, LBE take different ICCA (initial CCA) and
The value of ECCA, wherein the detection of first time CCA is known as ICCA, this time granularity is bigger, such as 34us；When detecting channel
The time granularity of ECCA after the cut-off of busy or Channel holding time is smaller, such as 9us.Meanwhile as shown in Fig. 2, believing
In road detection, if detecting channel busy, to increase a defer period (delay time), the value of the defer period
It is suitable with the value of initial CCA, that is to say, that must to detect channel idle for a long time again, N-1 could be continued.
In fact the specific time span of defer period process and ECCA process is all unfixed, because of defer
During period, before the channel idle duration reaches defer period duration, may there are channel busy or channel
When idle duration is shorter than defer period duration, these are all during defer period.Equally, in ECCA
In, before detecting the ECCA slot (granularity) of N number of free time, it may detect that busy ECCA slot and busy detecting
When also to have the process of defer period, so the time span of ECCA process is also unfixed.
It due to there is certain size when each data packet reaches, and is in general all to need multiple maximum letters
Road holding time can just transfer.As shown in figure 3, when first data packet is come, that is, buffer (buffer area) interior data
When from scratch, how contention window size initial during the channel competition based on LBE is arranged for the first time, there is presently no
Specific method, and after first time Channel holding time, how competition window is based on during second of channel competition
Initial competition window and channel current state (such as channel detection result of HARQ feedback or eNB) etc. are adjusted, in detail
Thin method is not known yet.
Since channel circumstance and data service are variations, if taking identical competition window q value in Channel Detection,
It may cause to collide since the value of competition window is too small, it is also possible to when increasing transmission since the value of competition window is excessive
Prolong.Therefore, how to avoid taking identical contention window value and causing the above problem occur as technology urgently to be resolved
Problem.
Summary of the invention
The present invention is based at least one above-mentioned technical problem, proposes a kind of new channel inspection based on competition window
Survey scheme realizes and is neatly adjusted according to the actual situation to the value of competition window, effectively prevents the value of competition window
It is too small and cause to collide, the problem of increasing transmission delay since the value of competition window is excessive is also avoided, is conducive to promote letter
The handling capacity of road utilization rate and system.
In view of this, according to the first aspect of the invention, proposing a kind of channel detection method based on competition window, wrap
It includes: determining the value of competition window；When starting ECCA channel detection process, random number is chosen according to the value of the competition window,
And Channel Detection is carried out based on the random number；When being determined to occupy the channel, data are sent by the channel.
According to the second aspect of the invention, it is also proposed that a kind of Channel Detection device based on competition window, comprising: processing
Unit, for determining the value of competition window；Channel detection unit is used for when starting ECCA channel detection process, according to described
The value of competition window chooses random number, and carries out Channel Detection based on the random number；Transmission unit, for being examined in the channel
When survey unit is determined to occupy the channel, passes through the channel and send data.
In above-mentioned technical proposal, by determining the value of competition window, in ECCA channel detection process, according to contention window
The value of mouth chooses random number, and carries out Channel Detection based on random number, realizes according to the actual situation neatly to competition window
Value be adjusted, the value for effectively preventing competition window is too small and causes to collide, and also avoids the value mistake due to competition window
The problem of increasing transmission delay greatly is conducive to the handling capacity for promoting channel utilization and system.
Detailed description of the invention
Fig. 1 shows the frame structure schematic diagram of the LBT mechanism based on LBE；
Fig. 2 shows the frame structure schematic diagrames for the LBE mechanism for including defer period process；
Fig. 3 shows the schematic diagram of Competition adjustment window size；
Fig. 4 shows the schematic flow diagram of the channel detection method based on competition window of embodiment according to the present invention；
Fig. 5 shows the schematic block diagram of the Channel Detection device based on competition window of embodiment according to the present invention；
Fig. 6 shows the schematic block diagram of the base station of embodiment according to the present invention；
Fig. 7 shows the schematic block diagram of the terminal of embodiment according to the present invention.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Fig. 4 shows the schematic flow diagram of the channel detection method based on competition window of embodiment according to the present invention.
As shown in figure 4, the channel detection method based on competition window of embodiment according to the present invention, comprising:
Step 402, the value of competition window is determined；
Step 404, when starting ECCA channel detection process, random number, and base are chosen according to the value of the competition window
Channel Detection is carried out in the random number；
Step 406, when being determined to occupy the channel, data are sent by the channel.
In the technical scheme, by determining the value of competition window, in ECCA channel detection process, according to contention window
The value of mouth chooses random number, and carries out Channel Detection based on random number, makes it possible to (such as channel status, number according to the actual situation
According to business demand etc.) value of neatly Competition adjustment window, the value for effectively preventing competition window is too small and causes to collide, and also keeps away
The problem of increasing transmission delay since the value of competition window is excessive is exempted from, has been conducive to promote handling up for channel utilization and system
Amount.
In the above-mentioned technical solutions, it is preferable that the step of carrying out Channel Detection based on the random number specifically includes: selecting
In channel detection process after taking the random number, if detecting channel busy, the value of the random number is constant, if detecting letter
Road is idle, then the value of the random number subtracts 1, when the value of the random number is 0, is determined to occupy the channel, wherein
The value of the random number is between 1 and the value of the competition window.
The value of above-mentioned competition window includes the value of initial competitor window and the value of non-initial competition window.Initial competitor window
It is described below with the relationship of non-initial competition window: if ICCA process, when detecting channel idle, meeting busy channel sends number
According to after maximum channel occupancy duration reaches, there will be a defer period processes, and then can execute ECCA process；
If ICCA detects channel busy, there will be a defer period processes, and then can execute ECCA process.Wherein, first
Competition window during ECCA is referred to as initial competitor window, and the competition window during subsequent ECCA is referred to as non-initial
Competition window.
The value of the value for how determining non-initial competition window and initial competitor window is introduced individually below:
In any of the above-described technical solution, it is preferable that the step of determining the value of the initial competitor window specifically includes:
Determine the QoS requirement of data service to be sent；The service quality of the data service to be sent is needed
Ask the minimum value of corresponding competition window as the value of the initial competitor window.
Specifically, if the minimum value of the corresponding competition window of voice service is 3, maximum value is 7, then is language in data service
When sound business, 3 can be set by the value of initial competitor window；If the minimum value of the corresponding competition window of video traffic is 7, most
Big value is 15, then when data service is video traffic, the value of initial competitor window can be set as 7；For another example best effort
Minimum value corresponding with the business of background is 15, and maximum value is 1023, then data service be best effort or
When background business, 15 can be set by the value of initial competitor window.
In any of the above-described technical solution, it is preferable that determine the initial competitor window value and non-initial competition window
Value the step of specifically include:
The watch window detected to channel is set, and is examined by state of the watch window to the channel
It surveys；State based on the channel that the watch window detects determines the value of the initial competitor window and/or described non-
The value of initial competitor window.
In the technical scheme, channel status is examined by the way that watch window (observation window) is arranged
It surveys, to determine the value of initial competitor window and/or the value of non-initial competition window according to the channel status detected, so that setting
The value for the initial competitor window set and/or the value of non-initial competition window can adapt to the variation in channel status, avoid competing
The value for striving window is too small and causes to collide, and also avoids the problem of increasing transmission delay since the value of competition window is excessive, having
Conducive to the handling capacity for promoting channel utilization and system.
Wherein, the mode of watch window has following three kinds:
Mode one:
In any of the above-described technical solution, it is preferable that the watch window that setting detects channel, and pass through the sight
The step of window detects the state of the channel is examined to specifically include:
The time span that the watch window is arranged includes positive integer ECCA detection granularity；Determine each ECCA inspection
Survey the channel status that granularity Detection arrives.
Mode two:
In any of the above-described technical solution, it is preferable that the watch window that setting detects channel, and pass through the sight
The step of window detects the state of the channel is examined to specifically include:
In the detection time of the watch window, fixed value N is randomly selected, and in subsequent channel detection process,
If detecting channel busy, N is constant, if detecting channel idle, N subtracts 1, when N is 0, determines the watch window
Detection time terminates, wherein in the detection time of the watch window, when any ECCA detects granularity Detection to channel busy
When, defer period process is configured after any ECCA detection granularity.
Watch window under which is similar to the process of an ECCA.
Mode three:
In any of the above-described technical solution, it is preferable that the watch window that setting detects channel, and pass through the sight
It examines the step of window detects the state of the channel to specifically include: in the detection time of the watch window, execute
To the detection process of channel status, and when being continuously detected the duration that the channel is in idle condition and reaching scheduled duration,
Determine that the detection time of the watch window terminates.
Watch window under which is similar to the process of a defer period.
In any of the above-described technical solution, it is preferable that the state based on the channel that the watch window detects, really
The step of value of the fixed initial competitor window and/or the value of the non-initial competition window, specifically includes: according to the observation
The state for the channel that windows detecting arrives determines the index for being used to indicate the channel status；
Using the value of the pre-stored competition window corresponding to the index as the value of the initial competitor window and/or
The value of the non-initial competition window；Or
According to the relationship of the finger target value and the critical value of setting, the value of the non-initial competition window is adjusted.
In the technical scheme, according to using the value of the pre-stored competition window corresponding to index as initial competitor
The scheme of the value of window and/or the value of non-initial competition window then needs to be stored in advance between index and the value of competition window
Corresponding relationship, with after determining to be used to indicate the index of channel status, easily competition window corresponding with the index
Value.Further, it is also possible to according to the relationship between the critical value of the index value and setting determined, neatly to non-initial contention window
The value of mouth is adjusted.
In any of the above-described technical solution, it is preferable that according to the relationship of the finger target value and the critical value of setting, adjustment
The step of value of the non-initial competition window, specifically includes:
If the finger target value is greater than or equal to the first critical value, increase the value of the non-initial competition window；Otherwise,
Reduce the value of the non-initial competition window or the value of the non-initial competition window is set as minimum value；Or
If the finger target value is less than or equal to the second critical value, increase the value of the non-initial competition window；Otherwise,
Reduce the value of the non-initial competition window or the value of the non-initial competition window is set as minimum value.
Specifically, big come Competition adjustment window based on the relationship between index and critical value in the index difference of selection
Small method is also different, it may be possible to when index is greater than or equal to critical value, increase the value of competition window, it is also possible in index
When less than or equal to critical value, increase the value of competition window.
In any of the above-described technical solution, it is preferable that the index for being used to indicate the channel status includes: the first reference value
Or the ratio of first reference value and the second reference value；Wherein, first reference value includes: detection in the watch window
The number of the detection granularity of channel idle, the sight are detected in the number of the detection granularity of channel busy, the watch window
Examine the time hop counts that channel busy is detected in window；Second reference value includes: the detection time, described of the watch window
The detection grain that channel busy is detected in the number and the watch window of the detection granularity of channel idle is detected in watch window
The sum of number of degree.
In any of the above-described technical solution, it is preferable that described to be carried out by state of the watch window to the channel
The step of detection, specifically includes: when data service to be sent does not reach, by the watch window periodically to described
The state of channel is detected；And/or when data service to be sent arrived and need to be implemented ECCA detection process, pass through
The watch window detects the state of the channel.
In the technical scheme, the watch window period of setting can just be passed through when data service to be sent does not reach
Property the state of channel is detected；When can also arrived in data service to be sent and need to be implemented ECCA detection,
Just channel status is detected by the watch window being arranged.
Wherein, when ICCA detects channel busy or after ICCA detects channel idle and completes data transmission, meeting
Defer period process is executed, and then executes ECCA process again, i.e., before ECCA detection process, is provided with defer
Period process.If passing through the observation window when data service to be sent arrived and need to be implemented ECCA detection process
Mouth detects the state of the channel, then
The detection time of the watch window is before defer period process, and the detection time of the watch window
It is adjacent with defer period process, and be not overlapped；Or
The detection time of the watch window is before defer period process, and the detection time of the watch window
There are laps with defer period process；Or
The detection time of the watch window is after defer period process, and the detection time of the watch window
It is adjacent with defer period process, and be not overlapped；Or
The detection time of the watch window is after defer period process, and the detection time of the watch window
There are laps with defer period process；Or
The detection time of the watch window and the time of defer period process are completely overlapped.
In addition, before ECCA detection process, when being provided with defer period process.If in data service to be sent
When arrived and needing to be implemented ECCA detection process, detected by state of the watch window to the channel, then
The detection time of the watch window is the sum of the time of defer period process Yu the ECCA detection process；
Or
The detection time of the watch window is the time of the ECCA detection process；Or
It is identical as at the beginning of the ECCA detection process at the beginning of the watch window；Or
The end time of the watch window is before the end time of the ECCA detection process.
Fig. 5 shows the schematic block diagram of the Channel Detection device based on competition window of embodiment according to the present invention.
As shown in figure 5, the Channel Detection device 500 based on competition window of embodiment according to the present invention, comprising: processing
Unit 502, channel detection unit 504 and transmission unit 506.
Wherein, processing unit 502, for determining the value of competition window；Channel detection unit 504, in starting ECCA
When channel detection process, random number is chosen according to the value of the competition window, and Channel Detection is carried out based on the random number；Hair
Unit 506 is sent, for sending data by the channel when the channel detection unit is determined to occupy the channel.
In the technical scheme, by determining the value of competition window, in ECCA channel detection process, according to contention window
The value of mouth chooses random number, and carries out Channel Detection based on random number, makes it possible to (such as channel status, number according to the actual situation
According to business demand etc.) value of neatly Competition adjustment window, the value for effectively preventing competition window is too small and causes to collide, and also keeps away
The problem of increasing transmission delay since the value of competition window is excessive is exempted from, has been conducive to promote handling up for channel utilization and system
Amount.
In the above-mentioned technical solutions, it is preferable that the channel detection unit 504 is based on the random number and carries out Channel Detection
Operation specifically include: in choosing the channel detection process after the random number, if detecting channel busy, the random number
Value it is constant, if detecting channel idle, the value of the random number subtracts 1, until the random number value be 0 when, determine energy
Enough occupy the channel, wherein the value of the random number is between 1 and the value of the competition window.
The value of above-mentioned competition window includes the value of initial competitor window and the value of non-initial competition window.Initial competitor window
It is described below with the relationship of non-initial competition window: if ICCA process, when detecting channel idle, meeting busy channel sends number
According to after maximum channel occupancy duration reaches, there will be a defer period processes, and then can execute ECCA process；
If ICCA detects channel busy, there will be a defer period processes, and then can execute ECCA process.Wherein, first
Competition window during ECCA is referred to as initial competitor window, and the competition window during subsequent ECCA is referred to as non-initial
Competition window.
The value of the value for how determining non-initial competition window and initial competitor window is introduced individually below:
In any of the above-described technical solution, it is preferable that the processing unit 502 is specifically used for determining initial competitor window
Value, comprising: the first determination unit 5022 will be described to be sent for determining the QoS requirement of data service to be sent
Data service the corresponding competition window of QoS requirement value of the minimum value as the initial competitor window.
Specifically, if the minimum value of the corresponding competition window of voice service is 3, maximum value is 7, then is language in data service
When sound business, 3 can be set by the value of initial competitor window；If the minimum value of the corresponding competition window of video traffic is 7, most
Big value is 15, then when data service is video traffic, the value of initial competitor window can be set as 7；For another example best effort
Minimum value corresponding with the business of background is 15, and maximum value is 1023, then data service be best effort or
When background business, 15 can be set by the value of initial competitor window.
In any of the above-described technical solution, it is preferable that the processing unit 502 is specifically used for determining initial competitor window
The value of value and non-initial competition window, comprising: setting unit 5024, for the watch window detected to channel to be arranged, and
It is detected by state of the watch window to the channel；Second determination unit 5026 is examined based on the watch window
The state of the channel measured determines the value of the initial competitor window and/or the value of the non-initial competition window.
In the technical scheme, channel status is examined by the way that watch window (observation window) is arranged
It surveys, to determine the value of initial competitor window and/or the value of non-initial competition window according to the channel status detected, so that setting
The value for the initial competitor window set and/or the value of non-initial competition window can adapt to the variation in channel status, avoid competing
The value for striving window is too small and causes to collide, and also avoids the problem of increasing transmission delay since the value of competition window is excessive, having
Conducive to the handling capacity for promoting channel utilization and system.
Wherein, the mode for the watch window that setting unit 5024 is arranged has following three kinds:
Mode one:
In any of the above-described technical solution, it is preferable that the setting unit 5024 is specifically used for: the watch window is arranged
Time span include positive integer ECCA detection granularity, and determine the channel shape that each ECCA detection granularity Detection arrives
State.
Mode two:
In any of the above-described technical solution, it is preferable that the setting unit 5024 is specifically used for: in the watch window
In detection time, fixed value N is randomly selected, and in subsequent channel detection process, if detecting channel busy, N is constant, if
Detect channel idle, then N subtracts 1, when N is 0, determines that the detection time of the watch window terminates, wherein in the sight
It examines in the detection time of window, when any ECCA detection granularity Detection arrives channel busy, after any ECCA detects granularity
Configure defer period process.
Watch window under which is similar to the process of an ECCA.
Mode three:
In any of the above-described technical solution, it is preferable that the setting unit 5024 is specifically used for: in the watch window
It in detection time, executes to the detection process of channel status, and in the duration for being continuously detected the channel and being in idle condition
When reaching scheduled duration, determine that the detection time of the watch window terminates.
Watch window under which is similar to the process of a defer period.
In any of the above-described technical solution, it is preferable that second determination unit 5026 includes: the first execution unit
502A, the state of the channel for being detected according to the watch window determine the finger for being used to indicate the channel status
Mark；
Second execution unit 502B, for using the value of the pre-stored competition window corresponding to the index as described in
The value of the value of initial competitor window and/or the non-initial competition window；Or
Adjustment unit 502C is adjusted described non-initial for the relationship according to the finger target value and the critical value of setting
The value of competition window.
In the technical scheme, according to using the value of the pre-stored competition window corresponding to index as initial competitor
The scheme of the value of window and/or the value of non-initial competition window then needs to be stored in advance between index and the value of competition window
Corresponding relationship, with after determining to be used to indicate the index of channel status, easily competition window corresponding with the index
Value.Further, it is also possible to according to the relationship between the critical value of the index value and setting determined, neatly to non-initial contention window
The value of mouth is adjusted.
In any of the above-described technical solution, it is preferable that the index for being used to indicate the channel status includes: the first reference value
Or the ratio of first reference value and the second reference value；Wherein, first reference value includes: detection in the watch window
The number of the detection granularity of channel idle, the sight are detected in the number of the detection granularity of channel busy, the watch window
Examine the time hop counts that channel busy is detected in window；Second reference value includes: the detection time, described of the watch window
The detection grain that channel busy is detected in the number and the watch window of the detection granularity of channel idle is detected in watch window
The sum of number of degree.
In any of the above-described technical solution, it is preferable that the adjustment unit 502C is specifically used for: big in the finger target value
When the first critical value, increase the value of the non-initial competition window；Otherwise, reduce the non-initial competition window
The value of the non-initial competition window is set as minimum value by value；Or
When the finger target value is less than or equal to the second critical value, increase the value of the non-initial competition window；Otherwise,
Reduce the value of the non-initial competition window or the value of the non-initial competition window is set as minimum value.
In any of the above-described technical solution, it is preferable that the setting unit 5024 is specifically used for: in data industry to be sent
When business does not reach, periodically the state of the channel is detected by the watch window；And/or in number to be sent
When arrived according to business and needing to be implemented ECCA detection process, examined by state of the watch window to the channel
It surveys.
In the technical scheme, the watch window period of setting can just be passed through when data service to be sent does not reach
Property the state of channel is detected；When can also arrived in data service to be sent and need to be implemented ECCA detection,
Just channel status is detected by the watch window being arranged.
Wherein, when ICCA detects channel busy or after ICCA detects channel idle and completes data transmission, meeting
Defer period process is executed, and then executes ECCA process again, i.e., before ECCA detection process, is provided with defer
Period process.If passing through the observation window when data service to be sent arrived and need to be implemented ECCA detection process
Mouth detects the state of the channel, then
The detection time of the watch window is before defer period process, and the detection time of the watch window
It is adjacent with defer period process, and be not overlapped；Or
The detection time of the watch window is before defer period process, and the detection time of the watch window
There are laps with defer period process；Or
The detection time of the watch window is after defer period process, and the detection time of the watch window
It is adjacent with defer period process, and be not overlapped；Or
The detection time of the watch window is after defer period process, and the detection time of the watch window
There are laps with defer period process；Or
The detection time of the watch window and the time of defer period process are completely overlapped.
In addition, before ECCA detection process, when being provided with defer period process.If in data service to be sent
When arrived and needing to be implemented ECCA detection process, detected by state of the watch window to the channel, then
The detection time of the watch window is the sum of the time of defer period process Yu the ECCA detection process；
Or
The detection time of the watch window is the time of the ECCA detection process；Or
It is identical as at the beginning of the ECCA detection process at the beginning of the watch window；Or
The end time of the watch window is before the end time of the ECCA detection process.
Fig. 6 shows the schematic block diagram of the base station of embodiment according to the present invention.
As shown in fig. 6, the base station 600 of embodiment according to the present invention, comprising: be based on competition window as shown in Figure 5
Channel Detection device 500.
Specifically, base station 600, can be according to practical feelings when sending downlink data (including basic data and control signaling)
The value of condition (such as channel status, data traffic requirement) neatly Competition adjustment window, effectively prevents the value mistake of competition window
It is small and cause to collide, the problem of increasing transmission delay since the value of competition window is excessive is also avoided, is conducive to promote downlink
The utilization rate of channel and the handling capacity of system.
Fig. 7 shows the schematic block diagram of the terminal of embodiment according to the present invention.
As shown in fig. 7, the terminal 700 of embodiment according to the present invention, comprising: be based on competition window as shown in Figure 5
Channel Detection device 500.
Specifically, terminal 700 is when sending upstream data, can (such as channel status, data service need according to the actual situation
Ask) value of neatly Competition adjustment window, the value for effectively preventing competition window is too small and causes to collide, also avoid due to
The value of competition window is excessive and the problem of increase transmission delay, be conducive to promote the utilization rate of up channel and handling up for system
Amount.
Below with the specific embodiment technical solution that the present invention will be described in detail.
Technical solution of the present invention mainly gives competition window (including initial competitor window and non-initial contention window
Mouthful) value setting/method of adjustment of size, enable initial channel competition and non-initial competition window take one it is suitable
Value to reduce due to the too small bring channel collision of value, while also can be reduced and make channel competition since value is too big
Overlong time and bring time delay, improve channel utilization and throughput of system.Concrete scheme is as follows:
One, the obtaining value method of initial competitor window size:
Method one:
The value of initial competitor window size takes QoS (Quality of Service, the Service Quality of current data service
Amount) corresponding contention window minimum.If the minimum value of the corresponding competition window of voice service is 3, maximum value is 7, then in number
When according to business being voice service, 3 can be set by the value of initial competitor window；Most such as the corresponding competition window of video traffic
Small value is 7, and maximum value is 15, then when data service is video traffic, the value of initial competitor window can be set as 7；For another example
The corresponding minimum value of business of best effort and background are 15, and maximum value is 1023, then are best in data service
When effort or background business, 15 can be set by the value of initial competitor window.
Method two:
1, before data packet to be sent reaches, that is, when the equipment (can be terminal, be also possible to base station) does not have
When having data can be transmitted, periodically (if it is downlink, then base station carries out Channel Detection to progress Channel Detection；If it is uplink,
Then terminal carries out Channel Detection).Wherein, the above-mentioned Channel Detection Time periodically occurred is observation window, i.e.,
One watch window, then equipment this observation window carry out Channel Detection when, can detecte channel busy or
The number of not busy detection granularity (i.e. slot).
Observation window can have following three kinds of forms:
The time span value of one: observation window of form is fixed, for example includes N number of ECCA slot, wherein examining
Surveying granularity is all also not have defer period even if detecting channel busy for detection granularity with ECCA slot.If that
It detects that M ECCA slot is channel busy, then detects that N-M ECCA slot is channel idle.
Two: observation window of form is similar to the process of an ECCA, for example its competition window length q value is consolidated
Fixed or random number value N value is fixed.When N is decremented to 0, the observation window time terminates, and if ECCA
Slot detects busy, needs to increase the process of defer period later, thus this observation window when
Between length be uncertain.Certainly, this is also likely to be present one before being similar to the observation window of ECCA process
The process of a defer period.
Three: observation window of form is a defer period process.But each observation
The value of defer period in window, i.e. 16us+M × ECCA slot, this M value are fixed.That is each
When observation window starts, equipment starts Channel Detection, reaches defer until the detection channel idle duration
When period value, observation window terminates.
2, it after obtaining Channel Detection state in observation window, needs to define a metric and (refers to
Mark), be used to refer to selection using much values competition window q value, this index can there are many, specifically:
1. index may is that the slot number of channel busy；Or the slot number in channel spare time；Or slot number/(channel busy of channel busy
Slot number+channel spare time slot number)；Or the slot number in channel spare time/(the slot number of channel busy+channel spare time slot number)；Or
The time hop counts (if continuous multiple slot are busy, a referred to as time hop counts) of channel busy；Or the period of channel busy
Number/(the slot number of channel busy+channel spare time slot number).
Wherein, it is the case where observation window is integer ECCA slot that this method is most suitable, i.e.,
The form one of observation window；This method is also suitble to the form two and form three of observation window.
2. index may is that the slot number/observation window time span in channel spare time.This method is most suitable for
The form two and form three of observation window, this certain method are also suitble to the form of observation window
One.
3. index may is that slot number/observation window time span of channel busy；Or the time of channel busy
Number of segment/observation window time span (if continuous multiple slot are busy, a referred to as time hop counts).This
A method is most suitable for the form two and form three of observation window, this certain method is also suitble to observation
The form one of window.
For it is above-mentioned 2. and 3. in if denominator is observation window, it is not busy or busy that molecule can be deformed into channel
The sum of the time span of slot, what is obtained in this way is exactly a time scale.
3, in method two, the length of initial competitor window is exactly using the nearest observation periodically occurred
Channel detection result corresponding competition window length determines in window.It specifically, can be with after obtaining index metric
The value of initial competitor window is determined according to the corresponding relationship defined in advance.For example, if metric value is 0.1, initial contention window
Mouth q value is 15；If metric value is 0.2, initial competitor window q value is 31.
It should be noted that the time span between two observation window adjacent in method two is fixed
, such as 4ms.And the length of each observation window be can be different, form is also can be different,
Even if form is the same, for example is all ECCA process, but wherein the value of the value of q, the value of N or M can be different.
Two, the obtaining value method of non-initial contention window size:
When the data service in buffer (buffer area) reaches, and when Channel Detection needs to open ECCA process,
An observation window is arranged before starting in ECCA process.This observation window is initial competing with determination
The three kinds of forms for the observation window being arranged when striving the value of window are identical, and the metric being arranged is also first with determination
The metric being arranged when the value of beginning competition window is the same.But the observation window in this method is aperiodicity
's.
Under this methodology, due to observation window be before ECCA, and ECCA before be to have a defer
Period process, so observation window and defer period process has following a variety of possible relationships:
1, Observation window is before defer period process, the two close to but be not overlapped.
2, Observation window can have overlapping before defer period process.Such as observation
Before the window time ends, having had the channel idle duration is X us, then observation window terminates
Later, followed by start defer period process, if the following channel idle duration is Y us, and X+Y is
When defer period value, indicate that defer period process terminates.
3, Observation window is after defer period process, the two close to but be not overlapped.
4, Observation window can have overlapping after defer period process.Such as defer
Period is exactly a part of observation window, that is, starting a part of observation window is exactly
The process of defer period, if defer period finishes, observation window does not terminate also, then continuing
observation window.If defer period does not terminate also, observation window is had finished on, then
Defer period process needs to terminate.
5, the process of the defer period before observation window is exactly ECCA.In this case, it adjusts
The metric of contention window value is preferably the length of M/defer period process, and M here is exactly defer period=
M value in 16us+M × 9us (taking ECCA slot is 9us).
Simultaneously as observation window is before ECCA process, if adjacent with ECCA,
The relationship of observation window and ECCA are as follows:
1, observation window is exactly defer period plus ECCA process；
2, observation window is exactly the ECCA process after defer period；
3, observation window and ECCA process start simultaneously at；
4, observation window terminates before ECCA terminates.
In addition, the value of non-initial contention window size can also be (including initial competing according to the value of competition window before
Strive the value of window and non-initial competition window) it is adjusted.Specifically, it when determining metric is higher than the threshold value of setting, adjusts
The value of big non-initial competition window；When threshold value of the determining metric lower than setting, reduce the value of non-initial competition window, or
Reset to minimum value.
The technical solution of the above embodiment of the present invention proposes a kind of side of contention window size value in Channel Detection
Method can choose out the value of a suitable competition window, the value so as to avoid competition window is too small and makes according to this method
At collision；Also be avoided that the value of competition window it is excessive so that channel competition overlong time and the problem of increase transmission delay.
The technical scheme of the present invention has been explained in detail above with reference to the attached drawings, and the invention proposes a kind of new based on contention window
The Channel Detection scheme of mouth, realizes and is neatly adjusted according to the actual situation to the value of competition window, effectively prevent competing
The value for striving window is too small and causes to collide, and also avoids the problem of increasing transmission delay since the value of competition window is excessive, having
Conducive to the handling capacity for promoting channel utilization and system.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (16)
1. a kind of channel detection method based on competition window characterized by comprising
Determine the value of competition window；
When starting ECCA channel detection process, random number is chosen according to the value of the competition window, and be based on the random number
Carry out Channel Detection；
When being determined to occupy the channel, data are sent by the channel；
The step of value of the determining competition window, comprises determining that the value of initial competitor window and the value of non-initial competition window；
Determine the initial competitor window value and non-initial competition window value the step of specifically include:
The watch window detected to channel is set, and is detected by state of the watch window to the channel；
State based on the channel that the watch window detects determines the value of the initial competitor window and/or described
The value of non-initial competition window；
State based on the channel that the watch window detects determines the value of the initial competitor window and/or described
The step of value of non-initial competition window, specifically includes:
According to the state for the channel that the watch window detects, the index for being used to indicate the channel status is determined；
Using the value of the pre-stored competition window corresponding to the index as the value of the initial competitor window and/or described
The value of non-initial competition window；Or
According to the relationship of the finger target value and the critical value of setting, the value of the non-initial competition window is adjusted.
2. the channel detection method according to claim 1 based on competition window, which is characterized in that be based on the random number
The step of carrying out Channel Detection specifically includes:
In choosing the channel detection process after the random number, if detecting channel busy, the value of the random number is constant, if
Detect channel idle, then the value of the random number subtracts 1, when the value of the random number is 0, is determined to occupy the letter
Road,
Wherein, the value of the random number is between 1 and the value of the competition window.
3. the channel detection method according to claim 1 based on competition window, which is characterized in that setting carries out channel
The watch window of detection, and the step of being detected by state of the watch window to the channel specifically includes:
The time span that the watch window is arranged includes positive integer ECCA detection granularity；
Determine the channel status that each ECCA detection granularity Detection arrives.
4. the channel detection method according to claim 1 based on competition window, which is characterized in that setting carries out channel
The watch window of detection, and the step of being detected by state of the watch window to the channel specifically includes:
In the detection time of the watch window, fixed value N is randomly selected, and in subsequent channel detection process, if inspection
Channel busy is measured, then N is constant, if detecting channel idle, N subtracts 1, when N is 0, determines the detection of the watch window
Time terminates,
Wherein, in the detection time of the watch window, when any ECCA detects granularity Detection to channel busy, at described
One ECCA configures defer period process after detecting granularity.
5. the channel detection method according to claim 1 based on competition window, which is characterized in that setting carries out channel
The watch window of detection, and the step of being detected by state of the watch window to the channel specifically includes:
In the detection time of the watch window, the detection process to channel status is executed, and be continuously detected the letter
When the duration that road is in idle condition reaches scheduled duration, determine that the detection time of the watch window terminates.
6. the channel detection method according to claim 1 based on competition window, which is characterized in that be used to indicate the letter
The index of road state includes: the ratio of the first reference value or first reference value and the second reference value；
Wherein, first reference value includes: the number of detection granularity that channel busy is detected in the watch window, the sight
The time hop counts examined the number of the detection granularity for detecting channel idle in window, detect channel busy in the watch window；
Second reference value includes: the detection time of the watch window, detects channel idle in the watch window
Detect the sum of the number that the detection granularity of channel busy is detected in the number and the watch window of granularity.
7. the channel detection method according to claim 1 based on competition window, which is characterized in that according to the index
The step of relationship of value and the critical value of setting, the value of the adjustment non-initial competition window, specifically includes:
If the finger target value is greater than or equal to the first critical value, increase the value of the non-initial competition window；Otherwise, reduce
The value of the non-initial competition window is set as minimum value by the value of the non-initial competition window；Or
If the finger target value is less than or equal to the second critical value, increase the value of the non-initial competition window；Otherwise, reduce
The value of the non-initial competition window is set as minimum value by the value of the non-initial competition window.
8. the channel detection method according to any one of claim 1 to 7 based on competition window, which is characterized in that institute
The step of detecting by state of the watch window to the channel is stated to specifically include:
When data service to be sent does not reach, periodically the state of the channel is examined by the watch window
It surveys；And/or
When data service to be sent arrived and need to be implemented ECCA detection process, by the watch window to the letter
The state in road is detected.
9. the channel detection method according to claim 8 based on competition window, which is characterized in that executing the ECCA
Before detection process, it is configured with defer period process；
If when data service to be sent arrived and need to be implemented ECCA detection process, by the watch window to described
The state of channel is detected, then
The detection time of the watch window before defer period process, and the detection time of the watch window with
Defer period process is adjacent, and is not overlapped；Or the detection time of the watch window defer period process it
Before, and there are laps with defer period process for the detection time of the watch window；Or the inspection of the watch window
The time is surveyed after defer period process, and the detection time of the watch window is adjacent with defer period process,
And it is not overlapped；Or the detection time of the watch window is after defer period process, and the inspection of the watch window
Surveying the time, there are laps with defer period process；Or the detection time of the watch window and defer period mistake
The time of journey is completely overlapped；And/or
The detection time of the watch window is the sum of the time of defer period process Yu the ECCA detection process；Or institute
The detection time for stating watch window is the time of the ECCA detection process；Or at the beginning of the watch window with it is described
It is identical at the beginning of ECCA detection process；Or the end time of the watch window the ECCA detection process at the end of
Between before.
10. a kind of Channel Detection device based on competition window characterized by comprising
Processing unit, for determining the value of competition window；
Channel detection unit, for choosing random number according to the value of the competition window when starting ECCA channel detection process,
And Channel Detection is carried out based on the random number；
Transmission unit, for sending number by the channel when the channel detection unit is determined to occupy the channel
According to；
The processing unit is specifically used for determining the value of initial competitor window and the value of non-initial competition window, comprising:
Setting unit, for the watch window detected to channel to be arranged, and by the watch window to the channel
State is detected；
Second determination unit, the state based on the channel that the watch window detects, determines the initial competitor window
Value and/or the non-initial competition window value；
Second determination unit includes:
First execution unit, the state of the channel for being detected according to the watch window determine described in being used to indicate
The index of channel status；
Second execution unit, for using the value of the pre-stored competition window corresponding to the index as the initial competitor
The value of the value of window and/or the non-initial competition window；Or
Adjustment unit adjusts the non-initial competition window for the relationship according to the finger target value and the critical value of setting
Value.
11. the Channel Detection device according to claim 10 based on competition window, which is characterized in that the Channel Detection
Unit is specifically included based on the operation that the random number carries out Channel Detection:
In choosing the channel detection process after the random number, if detecting channel busy, the value of the random number is constant, if
Detect channel idle, then the value of the random number subtracts 1, when the value of the random number is 0, is determined to occupy the letter
Road,
Wherein, the value of the random number is between 1 and the value of the competition window.
12. the Channel Detection device according to claim 10 based on competition window, which is characterized in that the setting unit
It is specifically used for:
The time span that the watch window is arranged includes positive integer ECCA detection granularity, and determines each ECCA detection
The channel status that granularity Detection arrives.
13. the Channel Detection device according to claim 10 based on competition window, which is characterized in that the setting unit
It is specifically used for:
In the detection time of the watch window, fixed value N is randomly selected, and in subsequent channel detection process, if inspection
Channel busy is measured, then N is constant, if detecting channel idle, N subtracts 1, when N is 0, determines the detection of the watch window
Time terminates,
Wherein, in the detection time of the watch window, when any ECCA detects granularity Detection to channel busy, at described
One ECCA configures defer period process after detecting granularity.
14. the Channel Detection device according to claim 10 based on competition window, which is characterized in that the setting unit
It is specifically used for:
In the detection time of the watch window, the detection process to channel status is executed, and be continuously detected the letter
When the duration that road is in idle condition reaches scheduled duration, determine that the detection time of the watch window terminates.
15. the Channel Detection device according to claim 10 based on competition window, which is characterized in that the adjustment unit
It is specifically used for:
When the finger target value is greater than or equal to the first critical value, increase the value of the non-initial competition window；Otherwise, reduce
The value of the non-initial competition window is set as minimum value by the value of the non-initial competition window；Or
When the finger target value is less than or equal to the second critical value, then increase the value of the non-initial competition window；Otherwise, subtract
The value of the non-initial competition window is set as minimum value by the value of the small non-initial competition window.
16. the Channel Detection device described in any one of 0 to 15 based on competition window according to claim 1, which is characterized in that
The setting unit is specifically used for:
When data service to be sent does not reach, periodically the state of the channel is examined by the watch window
It surveys；And/or
When data service to be sent arrived and need to be implemented ECCA detection process, by the watch window to the letter
The state in road is detected.
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| CN201510624067.7A CN105338652B (en) | 2015-09-25 | 2015-09-25 | Channel detection method and device based on competition window |
| PCT/CN2015/093498 WO2017049724A1 (en) | 2015-09-25 | 2015-10-31 | Channel detection method and apparatus based on contention window |
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| EP3409065A4 (en) * | 2016-03-02 | 2019-01-16 | Samsung Electronics Co., Ltd. | Method and apparatus for uplink channel accessin wireless communication system |
| CN107294662B (en) * | 2016-03-30 | 2020-11-27 | 上海诺基亚贝尔股份有限公司 | Method and apparatus for adjusting CWS values for UL transmissions at UE side |
| EP3397016B1 (en) * | 2016-06-01 | 2021-08-04 | Huawei Technologies Co., Ltd. | Channel contention method and apparatus |
| GB2552716A (en) * | 2016-08-05 | 2018-02-07 | Tcl Communication Ltd | Methods and devices for updating an uplink contention window size in a wireless communication system |
| CN107426772B (en) * | 2017-07-04 | 2020-01-03 | 北京邮电大学 | Dynamic competition window adjusting method, device and equipment based on Q learning |
| CN110166182B (en) * | 2018-02-14 | 2022-07-19 | 华为技术有限公司 | Method for managing contention window and sending equipment |
| EP3855649A4 (en) * | 2018-09-18 | 2021-09-08 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and apparatus for determining number of uplink control information transmission resources, and program |
| WO2020186489A1 (en) * | 2019-03-20 | 2020-09-24 | 北京小米移动软件有限公司 | Method, apparatus and device for determining channel detection mechanism, and storage medium |
| US11122624B2 (en) * | 2019-06-17 | 2021-09-14 | Sony Group Corporation | Pre-packet arrival channel contention |
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| CN104812032A (en) * | 2015-04-10 | 2015-07-29 | 宇龙计算机通信科技(深圳)有限公司 | Method and device for using DRX in non-authorized frequency band |
| CN104936303A (en) * | 2015-06-17 | 2015-09-23 | 西安电子科技大学 | Carrier sensing threshold and competition window combined control method |
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