CN105338652A - Channel detection method based on contention window and device thereof - Google Patents
Channel detection method based on contention window and device thereof Download PDFInfo
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Abstract
The invention provides a channel detection method based on a contention window and a device thereof. The channel detection method based on the contention window comprises the steps that the value of the contention window is determined; when the ECCA channel detection process is started, channel detection is performed based on a random number according to the value selection random number of the contention window; and data are transmitted via a channel when occupation of the channel is determined. According to the channel detection method based on the contention window and the device thereof, the value of the contention window is flexibly adjusted according to actual situations so that collision caused by the undersized value of the contention window can be effectively avoided, a problem of increasing transmission time delay caused by the oversized value of the contention window can also be avoided, and thus utilization rate of the channel and throughput of the system can be enhanced.
Description
Technical field
The present invention relates to communication technical field, 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 technology
At present, 3GPP proposes the concept of LAA (the auxiliary access of LTEAssistedAccess, LTE), for authorizing the help of frequency spectrum to use unlicensed spectrum by LTE.And LTE (LongTermEvolution, Long Term Evolution) network is when using unauthorized frequency range, one of topmost key point guarantees that LAA can coexist with existing access technology (such as Wi-Fi) on fair friendly basis.And in traditional LTE system, do not have the mechanism of LBT (ListenBeforeTalk, listem-before-talk) to carry out collision free, in order to better coexist with Wi-Fi, LTE system needs a kind of LBT mechanism.Like this, if LTE detects channel busy in unlicensed spectrum, then can not take this frequency range, if detect that channel is not busy, just can take.
Based on the problems referred to above, propose a kind of based on LBE (Loadbasedequipment in correlation technique, equipment based on load) LBT mechanism, as shown in Figure 1: the LBT mechanism based on LBE is aperiodic, as long as business arrives, then trigger CCA to detect, if CCA detects idle, then send signaling or data at once; If channel busy detected, then get a random number N, the span of N is 1 to q, and wherein, q is the length of competition window, and its span is 4 to 32.Fig. 1 shows the situation of q=16, and now, when channel idle being detected, the maximum holding time of channel is (13/32) × q=6.5ms.After 6.5ms, taking ECCA (i.e. ExtendedCCA) mechanism, is namely also random value N, the scope of N is 1 to q, if value is 8, then represent that each CCA will detect channel detection time in ensuing continuous print CCA detection time, if channel idle detected, then N-1, if channel busy detected, then N is constant, when N is 0, send signaling or data.
In addition, in order to further keep fairness with Wi-Fi, LBE takes different ICCA (initialCCA) and the value of ECCA, and wherein, first time CCA detects and is called ICCA, and this time granularity is larger, such as 34us; When detecting that the time granularity of the ECCA after channel busy or Channel holding time cut-off is smaller, such as 9us.Meanwhile, as shown in Figure 2, in Channel Detection, if channel busy detected, then will increase a deferperiod (time of delay), the value of this deferperiod is suitable with the value of initialCCA, that is again channel idle must be detected for a long time, could N-1 be continued.
In fact the concrete time span of deferperiod process and ECCA process is all unfixed, because in deferperiod process, before the channel idle duration reaches deferperiod duration, when channel busy or channel idle duration may be had to be shorter than deferperiod duration, these are all in deferperiod process.Equally, in ECCA, before the ECCAslot (granularity) N number of free time being detected, busy ECCAslot may be detected and detecting that busy also will have the process of deferperiod, so the time span of ECCA process is also unfixed.
Owing to having certain size time each packet arrives, and be in general all need multiple maximum channel holding time just can transfer.As shown in Figure 3, when first packet comes, when namely buffer (buffering area) interior data are grown out of nothing, how first time is arranged based on contention window size initial in the channel competition process of LBE, also there is no clear and definite method at present, and after first time, Channel holding time terminated, in second time channel competition process, how competition window adjusts based on initial competition window and channel current state (channel detection result of such as HARQ feedback or eNB) etc., and detailed method is also uncertain.
Because channel circumstance and data service are changes, if take identical competition window q value in Channel Detection, then may be too small and cause collision due to the value of competition window, also may be excessive and increase transmission delay due to the value of competition window.Therefore, how can avoid taking identical contention window value and cause the technical problem that occurs that the problems referred to above become urgently to be resolved hurrily.
Summary of the invention
The present invention just based on above-mentioned technical problem one of at least, propose a kind of Channel Detection scheme based on competition window newly, achieve and neatly the value of competition window is adjusted according to actual conditions, the value that effectively prevent competition window is too small and cause collision, it also avoid value due to competition window excessive and increase the problem of transmission delay, be conducive to the throughput promoting channel utilization and system.
In view of this, according to a first aspect of the invention, propose a kind of channel detection method based on competition window, comprising: the value determining competition window; When starting ECCA channel detection process, the value according to described competition window chooses random number, and carries out Channel Detection based on described random number; When determining to take described channel, send data by described channel.
According to a second aspect of the invention, also proposed a kind of Channel Detection device based on competition window, comprising: processing unit, for determining the value of competition window; Channel detection unit, for when starting ECCA channel detection process, the value according to described competition window chooses random number, and carries out Channel Detection based on described random number; Transmitting element, during for determining to take described channel at described channel detection unit, sends data by described channel.
In technique scheme, by determining the value of competition window, with in ECCA channel detection process, value according to competition window chooses random number, and carry out Channel Detection based on random number, achieve and adjust the value of competition window neatly according to actual conditions, the value that effectively prevent competition window is too small and cause collision, it also avoid value due to competition window excessive and increase the problem of transmission delay, be conducive to the throughput promoting channel utilization and system.
Accompanying drawing explanation
Fig. 1 shows the frame structure schematic diagram of the LBT mechanism based on LBE;
Fig. 2 shows the frame structure schematic diagram of the LBE mechanism including deferperiod process;
Fig. 3 shows the schematic diagram of Competition adjustment window size;
Fig. 4 shows according to an embodiment of the invention based on the schematic flow diagram of the channel detection method of competition window;
Fig. 5 shows according to an embodiment of the invention based on the schematic block diagram of the Channel Detection device of competition window;
Fig. 6 shows the schematic block diagram of base station according to an embodiment of the invention;
Fig. 7 shows the schematic block diagram of terminal according to an embodiment of the invention.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
Fig. 4 shows according to an embodiment of the invention based on the schematic flow diagram of the channel detection method of competition window.
As shown in Figure 4, according to an embodiment of the invention based on the channel detection method of competition window, comprising:
Step 402, determines the value of competition window;
Step 404, when starting ECCA channel detection process, the value according to described competition window chooses random number, and carries out Channel Detection based on described random number;
Step 406, when determining to take described channel, sends data by described channel.
In this technical scheme, by determining the value of competition window, with in ECCA channel detection process, value according to competition window chooses random number, and carry out Channel Detection based on random number, make it possible to the value according to actual conditions (as channel status, data traffic requirement etc.) Competition adjustment window neatly, the value that effectively prevent competition window is too small and cause collision, it also avoid value due to competition window excessive and increase the problem of transmission delay, be conducive to the throughput promoting channel utilization and system.
In technique scheme, preferably, the step of carrying out Channel Detection based on described random number specifically comprises: in the channel detection process after choosing described random number, if channel busy detected, then the value of described random number is constant, if channel idle detected, then the value of described random number subtracts 1, until when the value of described random number is 0, determines to take described channel, wherein, the value of described random number is between 1 and the value of described competition window.
The value of above-mentioned competition window comprises the value of initial competitor window and the value of non-initial competition window.The relation of initial competitor window and non-initial competition window is described below: if ICCA process is when channel idle being detected, data can be sent by busy channel, take after duration reaches at maximum channel, then have a deferperiod process, and then ECCA process can be performed; If ICCA detects channel busy, then have a deferperiod process, and then ECCA process can be performed.Wherein, the competition window in first ECCA process is referred to as initial competitor window, and the competition window in follow-up ECCA process is referred to as non-initial competition window.
Below the value of the value how determining non-initial competition window and initial competitor window is introduced respectively:
In above-mentioned arbitrary technical scheme, preferably, determine that the step of the value of described initial competitor window specifically comprises:
Determine the QoS requirement of data service to be sent; Using the value of the minimum value of competition window corresponding for the QoS requirement of described data service to be sent as described initial competitor window.
Particularly, the minimum value of competition window as corresponding in speech business is 3, and maximum is 7, then, when data service is speech business, the value of initial competitor window can be set to 3; The minimum value of competition window as corresponding in video traffic is 7, and maximum is 15, then, when data service is video traffic, the value of initial competitor window can be set to 7; For another example the minimum value that the business of besteffort and background is corresponding is 15, and maximum is 1023, then, when data service is besteffort or background business, the value of initial competitor window can be set to 15.
In above-mentioned arbitrary technical scheme, preferably, determine that the step of the value of described initial competitor window and the value of non-initial competition window specifically comprises:
The watch window detected channel is set, and is detected by the state of described watch window to described channel; Based on the state of the described channel that described watch window detects, determine the value of described initial competitor window and/or the value of described non-initial competition window.
In this technical scheme, by arranging watch window (observationwindow), channel status is detected, to determine the value of initial competitor window and/or the value of non-initial competition window according to the channel status detected, make the value of initial competitor window of setting and/or the value of non-initial competition window can be adapted to the change of channel status, the value avoiding competition window is too small and cause collision, it also avoid value due to competition window excessive and increase the problem of transmission delay, be conducive to the throughput promoting channel utilization and system.
Wherein, the mode of watch window has following three kinds:
Mode one:
In above-mentioned arbitrary technical scheme, preferably, the watch window detected channel is set, and is specifically comprised by the step that the state of described watch window to described channel detects:
The time span arranging described watch window comprises a positive integer ECCA and detects granularity; Determine the channel status that each described ECCA detection granularity Detection arrives.
Mode two:
In above-mentioned arbitrary technical scheme, preferably, the watch window detected channel is set, and is specifically comprised by the step that the state of described watch window to described channel detects:
Within the detection time of described watch window, random selecting fixed value N, and in follow-up channel detection process, if channel busy detected, then N is constant, if channel idle detected, then N subtracts 1, until when N is 0, determine that the detection time of described watch window terminates, wherein, within the detection time of described watch window, when arbitrary ECCA detects granularity Detection to channel busy, after described arbitrary ECCA detects granularity, configure deferperiod process.
Watch window under which is similar to the process of an ECCA.
Mode three:
In above-mentioned arbitrary technical scheme, preferably, the watch window detected channel is set, and specifically comprised by the step that the state of described watch window to described channel detects: within the detection time of described watch window, perform the testing process to channel status, and when the duration continuing to detect that described channel is in idle condition reaches scheduled duration, determine that the detection time of described watch window terminates.
Watch window under which is similar to the process of a deferperiod.
In above-mentioned arbitrary technical scheme, preferably, based on the state of the described channel that described watch window detects, determine that the step of the value of described initial competitor window and/or the value of described non-initial competition window specifically comprises: according to the state of the described channel that described watch window detects, determine the index indicating described channel status;
Using the value of value as described initial competitor window of competition window corresponding to described index that prestore and/or the value of described non-initial competition window; Or
According to the relation of the critical value of described finger target value and setting, adjust the value of described non-initial competition window.
In this technical scheme, according to the scheme of the value corresponding to the competition window of index that will prestore as the value of the value of initial competitor window and/or non-initial competition window, then need the corresponding relation prestored between index and the value of competition window, with after determining the index being used to indicate channel status, the value of competition window corresponding with this index easily.In addition, according to the relation between the desired value determined and the critical value of setting, neatly the value of non-initial competition window can also be adjusted.
In above-mentioned arbitrary technical scheme, preferably, according to the relation of the critical value of described finger target value and setting, the step adjusting the value of described non-initial competition window specifically comprises:
If described finger target value is more than or equal to the first critical value, then increase the value of described non-initial competition window; Otherwise, reduce the value of described non-initial competition window or the value of described non-initial competition window be set to minimum value; Or
If described finger target value is less than or equal to the second critical value, then increase the value of described non-initial competition window; Otherwise, reduce the value of described non-initial competition window or the value of described non-initial competition window be set to minimum value.
Particularly, when the index chosen is different, the method carrying out Competition adjustment window size based on the relation between index from critical value is also different, may be when index is more than or equal to critical value, increase the value of competition window, also may be increase the value of competition window when index is less than or equal to critical value.
In above-mentioned arbitrary technical scheme, preferably, the index being used to indicate described channel status comprises: the ratio of the first reference value or described first reference value and the second reference value; Wherein, described first reference value comprises: time hop count channel busy being detected in the number of detection granularity channel idle being detected in the number of the detection granularity of channel busy, described watch window, described watch window detected in described watch window; Described second reference value comprises: the number sum detection granularity of channel busy being detected in the number of the detection granularity of channel idle and described watch window detected in the detection time of described watch window, described watch window.
In above-mentioned arbitrary technical scheme, preferably, the described step detected by the state of described watch window to described channel is specifically comprised: when data service to be sent does not arrive, periodically detected the state of described channel by described watch window; And/or when data service to be sent has arrived and needed to perform ECCA testing process, detected by the state of described watch window to described channel.
In this technical scheme, periodically the state of channel is detected with regard to the watch window by arranging when can not arrive in data service to be sent; When also can arrive in data service to be sent and need to perform ECCA detection, the watch window just by arranging has detected channel status.
Wherein, when ICCA detects channel busy or after ICCA detects channel idle and completes data transmission, deferperiod process can be performed, and then perform ECCA process again, namely before ECCA testing process, be provided with deferperiod process.If when data service to be sent has arrived and needed to perform ECCA testing process, detected by the state of described watch window to described channel, then
The detection time of described watch window is before deferperiod process, and the detection time of described watch window is adjacent with deferperiod process, and not overlapping; Or
The detection time of described watch window is before deferperiod process, and the detection time of described watch window and deferperiod process exist lap; Or
The detection time of described watch window is after deferperiod process, and the detection time of described watch window is adjacent with deferperiod process, and not overlapping; Or
The detection time of described watch window is after deferperiod process, and the detection time of described watch window and deferperiod process exist lap; Or
The detection time of described watch window is completely overlapping with the time of deferperiod process.
In addition, before ECCA testing process, when being provided with deferperiod process.If when data service to be sent has arrived and needed to perform ECCA testing process, detected by the state of described watch window to described channel, then
The detection time of described watch window is the time sum of deferperiod process and described ECCA testing process; Or
The detection time of described watch window is the time of described ECCA testing process; Or
The time started of described watch window is identical with the time started of described ECCA testing process; Or
The end time of described watch window is before the end time of described ECCA testing process.
Fig. 5 shows according to an embodiment of the invention based on the schematic block diagram of the Channel Detection device of competition window.
As shown in Figure 5, according to an embodiment of the invention based on the Channel Detection device 500 of competition window, comprising: processing unit 502, channel detection unit 504 and transmitting element 506.
Wherein, processing unit 502, for determining the value of competition window; Channel detection unit 504, for when starting ECCA channel detection process, the value according to described competition window chooses random number, and carries out Channel Detection based on described random number; Transmitting element 506, during for determining to take described channel at described channel detection unit, sends data by described channel.
In this technical scheme, by determining the value of competition window, with in ECCA channel detection process, value according to competition window chooses random number, and carry out Channel Detection based on random number, make it possible to the value according to actual conditions (as channel status, data traffic requirement etc.) Competition adjustment window neatly, the value that effectively prevent competition window is too small and cause collision, it also avoid value due to competition window excessive and increase the problem of transmission delay, be conducive to the throughput promoting channel utilization and system.
In technique scheme, preferably, the operation that described channel detection unit 504 carries out Channel Detection based on described random number specifically comprises: in the channel detection process after choosing described random number, if channel busy detected, then the value of described random number is constant, if channel idle detected, then the value of described random number subtracts 1, until when the value of described random number is 0, determines to take described channel, wherein, the value of described random number is between 1 and the value of described competition window.
The value of above-mentioned competition window comprises the value of initial competitor window and the value of non-initial competition window.The relation of initial competitor window and non-initial competition window is described below: if ICCA process is when channel idle being detected, data can be sent by busy channel, take after duration reaches at maximum channel, then have a deferperiod process, and then ECCA process can be performed; If ICCA detects channel busy, then have a deferperiod process, and then ECCA process can be performed.Wherein, the competition window in first ECCA process is referred to as initial competitor window, and the competition window in follow-up ECCA process is referred to as non-initial competition window.
Below the value of the value how determining non-initial competition window and initial competitor window is introduced respectively:
In above-mentioned arbitrary technical scheme, preferably, described processing unit 502 is specifically for determining the value of initial competitor window, comprise: the first determining unit 5022, for determining the QoS requirement of data service to be sent, using the value of the minimum value of competition window corresponding for the QoS requirement of described data service to be sent as described initial competitor window.
Particularly, the minimum value of competition window as corresponding in speech business is 3, and maximum is 7, then, when data service is speech business, the value of initial competitor window can be set to 3; The minimum value of competition window as corresponding in video traffic is 7, and maximum is 15, then, when data service is video traffic, the value of initial competitor window can be set to 7; For another example the minimum value that the business of besteffort and background is corresponding is 15, and maximum is 1023, then, when data service is besteffort or background business, the value of initial competitor window can be set to 15.
In above-mentioned arbitrary technical scheme, preferably, described processing unit 502 is specifically for the value of the value and non-initial competition window of determining initial competitor window, comprise: setting unit 5024, for arranging the watch window detected channel, and detected by the state of described watch window to described channel; Second determining unit 5026, based on the state of the described channel that described watch window detects, determines the value of described initial competitor window and/or the value of described non-initial competition window.
In this technical scheme, by arranging watch window (observationwindow), channel status is detected, to determine the value of initial competitor window and/or the value of non-initial competition window according to the channel status detected, make the value of initial competitor window of setting and/or the value of non-initial competition window can be adapted to the change of channel status, the value avoiding competition window is too small and cause collision, it also avoid value due to competition window excessive and increase the problem of transmission delay, be conducive to the throughput promoting channel utilization and system.
Wherein, the mode of the watch window of setting unit 5024 setting has following three kinds:
Mode one:
In above-mentioned arbitrary technical scheme, preferably, described setting unit 5024 specifically for: the time span arranging described watch window comprises a positive integer ECCA and detects granularity, and determines the channel status that each described ECCA detects granularity Detection and arrives.
Mode two:
In above-mentioned arbitrary technical scheme, preferably, described setting unit 5024 specifically for: within the detection time of described watch window, random selecting fixed value N, and in follow-up channel detection process, if channel busy detected, then N is constant, if channel idle detected, then N subtracts 1, until when N is 0, determine that the detection time of described watch window terminates, wherein, within the detection time of described watch window, when arbitrary ECCA detects granularity Detection to channel busy, after described arbitrary ECCA detects granularity, configure deferperiod process.
Watch window under which is similar to the process of an ECCA.
Mode three:
In above-mentioned arbitrary technical scheme, preferably, described setting unit 5024 specifically for: within the detection time of described watch window, perform the testing process to channel status, and when the duration continuing to detect that described channel is in idle condition reaches scheduled duration, determine that the detection time of described watch window terminates.
Watch window under which is similar to the process of a deferperiod.
In above-mentioned arbitrary technical scheme, preferably, described second determining unit 5026 comprises: the first performance element 502A, for the state of described channel detected according to described watch window, determines the index indicating described channel status;
Second performance element 502B, for the value of value as described initial competitor window of competition window corresponding to described index that will prestore and/or the value of described non-initial competition window; Or
Adjustment unit 502C, for the relation of the critical value according to described finger target value and setting, adjusts the value of described non-initial competition window.
In this technical scheme, according to the scheme of the value corresponding to the competition window of index that will prestore as the value of the value of initial competitor window and/or non-initial competition window, then need the corresponding relation prestored between index and the value of competition window, with after determining the index being used to indicate channel status, the value of competition window corresponding with this index easily.In addition, according to the relation between the desired value determined and the critical value of setting, neatly the value of non-initial competition window can also be adjusted.
In above-mentioned arbitrary technical scheme, preferably, the index being used to indicate described channel status comprises: the ratio of the first reference value or described first reference value and the second reference value; Wherein, described first reference value comprises: time hop count channel busy being detected in the number of detection granularity channel idle being detected in the number of the detection granularity of channel busy, described watch window, described watch window detected in described watch window; Described second reference value comprises: the number sum detection granularity of channel busy being detected in the number of the detection granularity of channel idle and described watch window detected in the detection time of described watch window, described watch window.
In above-mentioned arbitrary technical scheme, preferably, described adjustment unit 502C specifically for: when described finger target value is more than or equal to the first critical value, increase the value of described non-initial competition window; Otherwise, reduce the value of described non-initial competition window or the value of described non-initial competition window be set to minimum value; Or
When described finger target value is less than or equal to the second critical value, increase the value of described non-initial competition window; Otherwise, reduce the value of described non-initial competition window or the value of described non-initial competition window be set to minimum value.
In above-mentioned arbitrary technical scheme, preferably, described setting unit 5024 specifically for: when data service to be sent does not arrive, periodically the state of described channel is detected by described watch window; And/or when data service to be sent has arrived and needed to perform ECCA testing process, detected by the state of described watch window to described channel.
In this technical scheme, periodically the state of channel is detected with regard to the watch window by arranging when can not arrive in data service to be sent; When also can arrive in data service to be sent and need to perform ECCA detection, the watch window just by arranging has detected channel status.
Wherein, when ICCA detects channel busy or after ICCA detects channel idle and completes data transmission, deferperiod process can be performed, and then perform ECCA process again, namely before ECCA testing process, be provided with deferperiod process.If when data service to be sent has arrived and needed to perform ECCA testing process, detected by the state of described watch window to described channel, then
The detection time of described watch window is before deferperiod process, and the detection time of described watch window is adjacent with deferperiod process, and not overlapping; Or
The detection time of described watch window is before deferperiod process, and the detection time of described watch window and deferperiod process exist lap; Or
The detection time of described watch window is after deferperiod process, and the detection time of described watch window is adjacent with deferperiod process, and not overlapping; Or
The detection time of described watch window is after deferperiod process, and the detection time of described watch window and deferperiod process exist lap; Or
The detection time of described watch window is completely overlapping with the time of deferperiod process.
In addition, before ECCA testing process, when being provided with deferperiod process.If when data service to be sent has arrived and needed to perform ECCA testing process, detected by the state of described watch window to described channel, then
The detection time of described watch window is the time sum of deferperiod process and described ECCA testing process; Or
The detection time of described watch window is the time of described ECCA testing process; Or
The time started of described watch window is identical with the time started of described ECCA testing process; Or
The end time of described watch window is before the end time of described ECCA testing process.
Fig. 6 shows the schematic block diagram of base station according to an embodiment of the invention.
As shown in Figure 6, base station 600 according to an embodiment of the invention, comprising: as shown in Figure 5 based on the Channel Detection device 500 of competition window.
Particularly, base station 600 is when sending downlink data (comprising basic data and control signal), can according to the value of actual conditions (as channel status, data traffic requirement etc.) Competition adjustment window neatly, the value that effectively prevent competition window is too small and cause collision, it also avoid value due to competition window excessive and increase the problem of transmission delay, be conducive to promoting the utilance of down channel and the throughput of system.
Fig. 7 shows the schematic block diagram of terminal according to an embodiment of the invention.
As shown in Figure 7, terminal 700 according to an embodiment of the invention, comprising: as shown in Figure 5 based on the Channel Detection device 500 of competition window.
Particularly, terminal 700 is when sending upstream data, can according to the value of actual conditions (as channel status, data traffic requirement etc.) Competition adjustment window neatly, the value that effectively prevent competition window is too small and cause collision, it also avoid value due to competition window excessive and increase the problem of transmission delay, be conducive to promoting the utilance of up channel and the throughput of system.
Technical scheme of the present invention is described in detail below with specific embodiment.
Technical scheme of the present invention mainly gives the value setting/method of adjustment of competition window (comprising initial competitor window and non-initial competition window) size, initial channel is competed and non-initial competition window can get a suitable value, thus reduce the channel collision brought because value is too little, also the time delay making channel competition overlong time because value is too large and brings be can reduce simultaneously, channel utilization and throughput of system improve.Concrete scheme is as follows:
One, the obtaining value method of initial competitor window size:
Method one:
The value of initial competitor window size gets the contention window minimum of QoS (QualityofService, the service quality) correspondence of current data service.The minimum value of competition window as corresponding in speech business is 3, and maximum is 7, then, when data service is speech business, the value of initial competitor window can be set to 3; The minimum value of competition window as corresponding in video traffic is 7, and maximum is 15, then, when data service is video traffic, the value of initial competitor window can be set to 7; For another example the minimum value that the business of besteffort and background is corresponding is 15, and maximum is 1023, then, when data service is besteffort or background business, the value of initial competitor window can be set to 15.
Method two:
1, before packet to be sent arrives, namely when this equipment (can be terminal, also can be base station) does not have data to send, (if descending, then Channel Detection is carried out in base station periodically to carry out Channel Detection; If up, then terminal carries out Channel Detection).Wherein, the Channel Detection Time that above-mentioned periodicity occurs is observationwindow, an i.e. watch window, so equipment is when this observationwindow carries out Channel Detection, can detect the number of the detection granularity (i.e. slot) in channel busy or spare time.
Observationwindow can have following three kinds of forms:
The time span value of form one: observationwindow is fixed, and such as comprises N number of ECCAslot, and wherein detecting granularity is all be detect granularity with ECCAslot, even if channel busy detected, does not also have deferperiod.If so detect that M ECCAslot is channel busy, then detect that N-M ECCAslot is channel idle.
Form two: observationwindow is similar to the process of an ECCA, and such as its competition window length q value is fixing or random number value N value is fixing.When N is decremented to 0, the observationwindow time terminates, and if ECCAslot detects busy, need to increase the process of deferperiod afterwards, so the time span of this observationwindow is uncertain.Certainly, also may there is the process of a deferperiod in this before being similar to the observationwindow of ECCA process.
Form three: observationwindow is a deferperiod process.But the value of deferperiod, i.e. 16us+M × ECCAslot in each observationwindow, this M value is fixed.That is when each observationwindow starts, equipment starts Channel Detection, until when the detection channel idle duration reaches deferperiod value, observationwindow terminates.
2, after obtaining Channel Detection state in observationwindow, need definition metric (index), be used to refer to the competition window q value of the much values of choice for use, this index can have multiple, particularly:
1. index can be: the slot number of channel busy; Or the slot number in channel spare time; Or the slot number of channel busy/(the slot number in the slot number+channel spare time of channel busy); Or the slot number in channel spare time/(the slot number in the slot number+channel spare time of channel busy); Or the time hop count of channel busy (if continuous multiple slot is busy, being then called a time hop count); Or the time hop count of channel busy/(the slot number in the slot number+channel spare time of channel busy).
Wherein, the optimal observationwindow of being of the method is the situation of an integer ECCAslot, i.e. the form one of observationwindow; This method is also applicable to form two and the form three of observationwindow.
2. index can be: the slot number/observationwindow time span in channel spare time.The form two of the most applicable observationwindow of this method and form three, this method is also applicable to the form one of observationwindow certainly.
3. index can be: the slot number/observationwindow time span of channel busy; Or the time hop count/observationwindow time span of channel busy (if continuous multiple slot is busy, being then called a time hop count).The form two of the most applicable observationwindow of this method and form three, this method is also applicable to the form one of observationwindow certainly.
For 2. above-mentioned and 3. in denominator be observationwindow, molecule can be deformed into the time span sum of the not busy or busy slot of channel, and what obtain like this is exactly a time scale.
3, in method two, the length of initial competitor window is exactly that the competition window length that in the observationwindow using nearest periodicity to occur, channel detection result is corresponding is determined.Particularly, after obtaining index metric, can according to the value of the corresponding relation determination initial competitor window defined in advance.Such as, if metric value is 0.1, then initial competitor window q value is 15; If metric value is 0.2, then initial competitor window q value is 31.
It should be noted that the time span between two observationwindow adjacent in method two is fixing, such as 4ms.And the length of each observationwindow is can be different, form is also can be different, even if form is the same, be all such as 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 (buffering area) arrives, and when Channel Detection needs to open ECCA process, an observationwindow was set before ECCA process starts.This observationwindow is identical with three kinds of forms of the observationwindow arranged when determining the value of initial competitor window, and the metric arranged is also the same with the metric arranged when determining the value of initial competitor window.But the observationwindow in the method is acyclic.
Under this methodology, because observationwindow is before ECCA, and a deferperiod process is had before ECCA, so observationwindow and deferperiod process has following multiple possible relation:
1, Observationwindow is before deferperiod process, and both are close to but do not have overlap.
2, Observationwindow is before deferperiod process, can have overlap.Before the such as observationwindow time ends, the channel idle duration has been had to be Xus, after so observationwindow terminates, followed by beginning deferperiod process, if next the channel idle duration is Yus, and X+Y is when being deferperiod value, represent that deferperiod process terminates.
3, Observationwindow is after deferperiod process, and both are close to but do not have overlap.
4, Observationwindow is after deferperiod process, can have overlap.Such as deferperiod is exactly a part of observationwindow, namely an initial part of observationwindow is exactly the process of deferperiod, if deferperiod finishes, observationwindow does not also terminate, and so continues observationwindow.If deferperiod does not also terminate, observationwindow finishes, and so deferperiod process need terminates.
5, observationwindow be exactly ECCA before the process of deferperiod.In this case, the length of the metric of Competition adjustment window value preferably M/deferperiod process, M is here exactly the M value in deferperiod=16us+M × 9us (getting ECCAslot is 9us).
Meanwhile, because observationwindow is before ECCA process, if adjacent with ECCA, so the relation of observationwindow and ECCA is as follows:
1, observationwindow is exactly that deferperiod adds ECCA process;
2, observationwindow be exactly deferperiod after ECCA process;
3, observationwindow and ECCA process starts simultaneously;
4, observationwindow terminated before ECCA terminates.
In addition, the value of non-initial contention window size can also adjust according to the value (comprising the value of initial competitor window and non-initial competition window) of competition window before.Particularly, when the metric determined is higher than the threshold value arranged, the value of non-initial competition window is tuned up; When the metric determined is lower than the threshold value arranged, reduces the value of non-initial competition window, or reset to minimum value.
The technical scheme of the above embodiment of the present invention proposes a kind of method of the contention window size value when Channel Detection, according to the method, can select the value of a suitable competition window, thus the value avoiding competition window is too small and cause collision; Also can avoid that the value of competition window is excessive to be made channel competition overlong time and increase the problem of transmission delay.
More than be described with reference to the accompanying drawings technical scheme of the present invention, the present invention proposes a kind of Channel Detection scheme based on competition window newly, achieve and neatly the value of competition window is adjusted according to actual conditions, the value that effectively prevent competition window is too small and cause collision, it also avoid value due to competition window excessive and increase the problem of transmission delay, be conducive to the throughput promoting channel utilization and system.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (22)
1. based on a channel detection method for competition window, it is characterized in that, comprising:
Determine the value of competition window;
When starting ECCA channel detection process, the value according to described competition window chooses random number, and carries out Channel Detection based on described random number;
When determining to take described channel, send data by described channel.
2. the channel detection method based on competition window according to claim 1, is characterized in that, the step of carrying out Channel Detection based on described random number specifically comprises:
In channel detection process after choosing described random number, if channel busy detected, then the value of described random number is constant, if channel idle detected, then the value of described random number subtracts 1, until when the value of described random number is 0, determines to take described channel,
Wherein, the value of described random number is between 1 and the value of described competition window.
3. the channel detection method based on competition window according to claim 1 and 2, is characterized in that, describedly determines that the step of the value of competition window comprises: the value determining initial competitor window;
Determine that the step of the value of described initial competitor window specifically comprises:
Determine the QoS requirement of data service to be sent;
Using the value of the minimum value of competition window corresponding for the QoS requirement of described data service to be sent as described initial competitor window.
4. the channel detection method based on competition window according to claim 1, is characterized in that, describedly determines that the step of the value of competition window comprises: determine the value of initial competitor window and the value of non-initial competition window;
Determine that the step of the value of described initial competitor window and the value of non-initial competition window specifically comprises:
The watch window detected channel is set, and is detected by the state of described watch window to described channel;
Based on the state of the described channel that described watch window detects, determine the value of described initial competitor window and/or the value of described non-initial competition window.
5. the channel detection method based on competition window according to claim 4, is characterized in that, arranges the watch window detected channel, and is specifically comprised by the step that the state of described watch window to described channel detects:
The time span arranging described watch window comprises a positive integer ECCA and detects granularity;
Determine the channel status that each described ECCA detection granularity Detection arrives.
6. the channel detection method based on competition window according to claim 4, is characterized in that, arranges the watch window detected channel, and is specifically comprised by the step that the state of described watch window to described channel detects:
Within the detection time of described watch window, random selecting fixed value N, and in follow-up channel detection process, if channel busy detected, then N is constant, if channel idle detected, then N subtracts 1, until when N is 0, determines that the detection time of described watch window terminates,
Wherein, within the detection time of described watch window, when arbitrary ECCA detects granularity Detection to channel busy, after described arbitrary ECCA detects granularity, configure deferperiod process.
7. the channel detection method based on competition window according to claim 4, is characterized in that, arranges the watch window detected channel, and is specifically comprised by the step that the state of described watch window to described channel detects:
Within the detection time of described watch window, perform the testing process to channel status, and when the duration continuing to detect that described channel is in idle condition reaches scheduled duration, determine that the detection time of described watch window terminates.
8. the channel detection method based on competition window according to claim 4, it is characterized in that, based on the state of the described channel that described watch window detects, determine that the step of the value of described initial competitor window and/or the value of described non-initial competition window specifically comprises:
According to the state of the described channel that described watch window detects, determine the index indicating described channel status;
Using the value of value as described initial competitor window of competition window corresponding to described index that prestore and/or the value of described non-initial competition window; Or
According to the relation of the critical value of described finger target value and setting, adjust the value of described non-initial competition window.
9. the channel detection method based on competition window according to claim 8, is characterized in that, the index being used to indicate described channel status comprises: the ratio of the first reference value or described first reference value and the second reference value;
Wherein, described first reference value comprises: time hop count channel busy being detected in the number of detection granularity channel idle being detected in the number of the detection granularity of channel busy, described watch window, described watch window detected in described watch window;
Described second reference value comprises: the number sum detection granularity of channel busy being detected in the number of the detection granularity of channel idle and described watch window detected in the detection time of described watch window, described watch window.
10. the channel detection method based on competition window according to claim 8, is characterized in that, according to the relation of the critical value of described finger target value and setting, the step adjusting the value of described non-initial competition window specifically comprises:
If described finger target value is more than or equal to the first critical value, then increase the value of described non-initial competition window; Otherwise, reduce the value of described non-initial competition window or the value of described non-initial competition window be set to minimum value; Or
If described finger target value is less than or equal to the second critical value, then increase the value of described non-initial competition window; Otherwise, reduce the value of described non-initial competition window or the value of described non-initial competition window be set to minimum value.
11. channel detection methods based on competition window according to any one of claim 4 to 10, it is characterized in that, the described step detected by the state of described watch window to described channel is specifically comprised:
When data service to be sent does not arrive, periodically the state of described channel is detected by described watch window; And/or
When data service to be sent has arrived and needed to perform ECCA testing process, detected by the state of described watch window to described channel.
12. channel detection methods based on competition window according to claim 11, is characterized in that, before the described ECCA testing process of execution, are configured with deferperiod process;
If when data service to be sent has arrived and needed to perform ECCA testing process, detected by the state of described watch window to described channel, then
The detection time of described watch window is before deferperiod process, and the detection time of described watch window is adjacent with deferperiod process, and not overlapping; Or the detection time of described watch window is before deferperiod process, and there is lap in the detection time of described watch window and deferperiod process; Or the detection time of described watch window is after deferperiod process, and the detection time of described watch window is adjacent with deferperiod process, and not overlapping; Or the detection time of described watch window is after deferperiod process, and there is lap in the detection time of described watch window and deferperiod process; Or the detection time of described watch window is completely overlapping with the time of deferperiod process; And/or
The detection time of described watch window is the time sum of deferperiod process and described ECCA testing process; Or the detection time of described watch window is the time of described ECCA testing process; Or the time started of described watch window is identical with the time started of described ECCA testing process; Or the end time of described watch window is before the end time of described ECCA testing process.
13. 1 kinds, based on the Channel Detection device of competition window, is characterized in that, comprising:
Processing unit, for determining the value of competition window;
Channel detection unit, for when starting ECCA channel detection process, the value according to described competition window chooses random number, and carries out Channel Detection based on described random number;
Transmitting element, during for determining to take described channel at described channel detection unit, sends data by described channel.
The 14. Channel Detection devices based on competition window according to claim 13, it is characterized in that, the operation that described channel detection unit carries out Channel Detection based on described random number specifically comprises:
In channel detection process after choosing described random number, if channel busy detected, then the value of described random number is constant, if channel idle detected, then the value of described random number subtracts 1, until when the value of described random number is 0, determines to take described channel,
Wherein, the value of described random number is between 1 and the value of described competition window.
15. Channel Detection devices based on competition window according to claim 13 or 14, it is characterized in that, described processing unit, specifically for determining the value of initial competitor window, comprising:
First determining unit, for determining the QoS requirement of data service to be sent, using the value of the minimum value of competition window corresponding for the QoS requirement of described data service to be sent as described initial competitor window.
The 16. Channel Detection devices based on competition window according to claim 13, is characterized in that, described processing unit, specifically for the value of the value and non-initial competition window of determining initial competitor window, comprising:
Setting unit, for arranging the watch window detected channel, and is detected by the state of described watch window to described channel;
Second determining unit, based on the state of the described channel that described watch window detects, determines the value of described initial competitor window and/or the value of described non-initial competition window.
The 17. Channel Detection devices based on competition window according to claim 16, is characterized in that, described setting unit specifically for:
The time span arranging described watch window comprises a positive integer ECCA and detects granularity, and determines the channel status that each described ECCA detection granularity Detection arrives.
The 18. Channel Detection devices based on competition window according to claim 16, is characterized in that, described setting unit specifically for:
Within the detection time of described watch window, random selecting fixed value N, and in follow-up channel detection process, if channel busy detected, then N is constant, if channel idle detected, then N subtracts 1, until when N is 0, determines that the detection time of described watch window terminates,
Wherein, within the detection time of described watch window, when arbitrary ECCA detects granularity Detection to channel busy, after described arbitrary ECCA detects granularity, configure deferperiod process.
The 19. Channel Detection devices based on competition window according to claim 16, is characterized in that, described setting unit specifically for:
Within the detection time of described watch window, perform the testing process to channel status, and when the duration continuing to detect that described channel is in idle condition reaches scheduled duration, determine that the detection time of described watch window terminates.
The 20. Channel Detection devices based on competition window according to claim 16, it is characterized in that, described second determining unit comprises:
First performance element, for the state of described channel detected according to described watch window, determines the index indicating described channel status;
Second performance element, for the value of value as described initial competitor window of competition window corresponding to described index that will prestore and/or the value of described non-initial competition window; Or
Adjustment unit, for the relation of the critical value according to described finger target value and setting, adjusts the value of described non-initial competition window.
The 21. Channel Detection devices based on competition window according to claim 20, is characterized in that, described adjustment unit specifically for:
When described finger target value is more than or equal to the first critical value, increase the value of described non-initial competition window; Otherwise, reduce the value of described non-initial competition window or the value of described non-initial competition window be set to minimum value; Or
When described finger target value is less than or equal to the second critical value, then increase the value of described non-initial competition window; Otherwise, reduce the value of described non-initial competition window or the value of described non-initial competition window be set to minimum value.
22., according to claim 16 to the Channel Detection device based on competition window according to any one of 21, is characterized in that, described setting unit specifically for:
When data service to be sent does not arrive, periodically the state of described channel is detected by described watch window; And/or
When data service to be sent has arrived and needed to perform ECCA testing process, detected by the state of described watch window to described channel.
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