CN104539405A - Channel detection method, channel detection system, base station and terminal - Google Patents
Channel detection method, channel detection system, base station and terminal Download PDFInfo
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- CN104539405A CN104539405A CN201510043773.2A CN201510043773A CN104539405A CN 104539405 A CN104539405 A CN 104539405A CN 201510043773 A CN201510043773 A CN 201510043773A CN 104539405 A CN104539405 A CN 104539405A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/04—Scheduled or contention-free access
Abstract
The invention provides a channel detection method of an LTE system during unlicensed frequency band operation, a channel detection system of the LTE system during unlicensed frequency band operation, a base station and a terminal. The method comprises the following steps: continuously performing channel detection according to the frame structure-based fixed cycle; setting load-based extra channel detection time when a data service reaches; and determining whether to transmit the data service according to a first detection result obtained by performing channel detection according to the fixed cycle and/or a second detection result obtained by performing channel detection according to the extra channel detection time. According to the technical scheme disclosed by the invention, the channel detection is simultaneously performed by virtue of the LBT mechanism for performing channel detection according to the frame structure-based fixed cycle and the load-based LBT mechanism for performing channel detection when the data service reaches, the channel occupancy can be further increased, and the time delay is reduced.
Description
Technical field
The present invention relates to communication technical field, in particular to the channel detection method of a kind of LTE system when unauthorized band operation, LTE system at unauthorized band operation time Channel Detection system, a kind of base station and a kind of terminal.
Background technology
Along with the sharply increase of message volume, the mandate frequency spectrum of 3GPP is more and more not enough to provide higher network capacity.In order to improve the utilance of frequency spectrum resource further, 3GPP is just discussing how under the help of authorizing frequency spectrum, to use unlicensed spectrum, as 2.4GHz and 5GHz frequency range.The systems such as these unlicensed spectrums current mainly Wi-Fi, bluetooth, radar, medical treatment are in use.
Under normal circumstances, the access technology designed for authorizing frequency range, as LTE (Long TermEvolution, Long Term Evolution) is not suitable for using in unauthorized frequency range, because the requirement that this kind of access technology of LTE is optimized spectrum efficiency and Consumer's Experience is very high.But carrier aggregation (CarrierAggregation, CA) function allows and LTE is deployed in unauthorized frequency range becomes possibility.3GPP proposes the concept of LAA (access that Licensed Assisted Access, LTE authorize frequency spectrum auxiliary), authorizes the help of frequency spectrum to use unlicensed spectrum by LTE.And unlicensed spectrum can have two kinds of working methods, one is supplementary descending (SDL, Supplemental Downlink), namely only has downlink transfer subframe; Another kind is tdd mode, has both comprised downlink transfer subframe, also comprises uplink subframe.Supplementing descending this situation can only be use (as shown in Figure 1) by carrier aggregation technology.And tdd mode is except can using by DC (Dual Connectivity, doubly-linked leads to), also can independently use.
Compared to Wi-Fi system, the LTE system being operated in unauthorized frequency range has the ability to provide higher spectrum efficiency and larger coverage effect, allows data traffic authorize seamless switching between frequency range and unauthorized frequency range based on same core net simultaneously.Concerning user, this means better broadband experience, higher speed, better stability and mobile facility.
The existing access technology used in unlicensed spectrum, as Wi-Fi, has more weak antijamming capability.In order to avoid interference, rule is avoided in a lot of interference of Wi-Fi system, as CSMA/CD (Carrier Sense Multiple Access/Collision Detection, csma/collision detection method), the general principle of this method is the AP (AccessPoint of Wi-Fi, access point) or terminal transmission signaling or data before, want whether have other AP or other-end around first Monitor detection in sending/receiving signaling or data, if have, then continue to monitor, do not have until listen to; If no, then generate a random number as back off time, in this back off time, if signaling or transfer of data do not detected, so after back off time terminates, AP or terminal can start to send signaling or data.This process as shown in Figure 2.
But, owing to there being good orthogonality to ensure that interference level in LTE network, so the downstream transmission of base station and user need not consider whether have other base stations or other users transmitting data around.If whether have other equipment around also not considering when LTE uses in unauthorized frequency range in the unauthorized frequency range of use, so great interference will be brought to Wi-Fi equipment.As long as because LTE has business just to transmit, without any monitoring rule, so Wi-Fi equipment just can not be transmitted when LTE has business to transmit, can only wait until that LTE business is transmitted, just can detect that channel clear is to carry out transfer of data.
So LTE network is when using unauthorized frequency range, and 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 (Listen Before Talk, listem-before-talk) to carry out collision free.In order to better coexist with Wi-Fi system, LTE system needs a kind of LBT mechanism.
But the LBT mechanism of layout is all frame based LBT frame structure, and as shown in Figure 3, the cycle of LBT is fixing before, the time of CCA (Clear Channel Assessment, clear channel assessment (CCA)) is starting most of each cycle.Such as, in LBT frame structure, take 10ms as the cycle, CCA takies one or more symbol (symbol) of the foremost of #0 work song frame.Under the frame structure of this fixed cycle, only have #0 work song frame just can be CCA, if data service arrives, then after must waiting until that the #0 work song frame of next cycle carries out CCA at #1 work song frame, could judge whether channel can take, thus bring very large time delay.
So layout is based on (LBE, Load based equipment) LBT mechanism of load again, cardinal principle is when load (data service) arrives, carry out Channel Detection at once, if detect channel idle, then send data service at once; If detection channel busy, then adopt extendedCCA time, i.e. Stochastic choice one number N, in ensuing Channel Detection Time, if channel busy detected, then N is constant, if detect, channel is not busy, then N subtracts 1, when N is kept to 0, then can send data.
Based on the LBT mechanism of LBE, seem that Channel Detection chance is many, so can think that the probability of channel occupancy is large.And machine-processed based on the LBT of (FBE, the Framed based equipment) of frame structure, Channel Detection Time periodically repeats, as long as namely detect that channel is not busy, just can send; Detect busy, just do not send.
But, under certain conditions, as shown in Figure 4, figure A above) be the situation of equipment #1 when using FBE, figure B below) be the situation of equipment #1 when using LBE: suppose only have now equipment #1 and equipment #2 competitive channel, so in the t1 moment, the business of equipment #1 arrives, and carries out Channel Detection based on FBE and LBE simultaneously, and at this moment, equipment #2 transmits data, so equipment #1 detects channel busy in both cases.So in A situation, equipment #1 continues the arrival waiting until next Channel Detection Time; And in caseb, equipment #1 gets N=5 at random, continue to detect, but channel is always busy, N remains unchanged; In the t2 moment, equipment #2 reaches Channel holding time, starts again to carry out Channel Detection, if equipment #2 is value N=3 (as long as less than the N value of equipment #1), if so equipment #1 is B situation, after so channel idle being detected at 3 times, the N of equipment #2 becomes 0, starts to send data; And the N=2 of equipment #1, also need to continue to detect; And if equipment #1 uses the situation of FBE, namely A situation, in the t3 moment, the N=1 of equipment #2, and equipment #1 detects a channel idle, then start to send data.So, as can be seen from Figure 4, the situation of FBE also may probability larger than the situation of LBE take channel.
Therefore, how effectively reduce and carry out the LBT mechanism of Channel Detection or data service by the fixed cycle based on frame structure because only using to arrive the machine-processed channel seizure ratio caused of the LBT based on load namely carrying out Channel Detection low, to improve channel seizure ratio further and to reduce the technical problem that time delay becomes urgently to be resolved hurrily.
Summary of the invention
The present invention is just based on the problems referred to above, propose a kind of new technical scheme, arrive the LBT mechanism based on load of namely carrying out Channel Detection in conjunction with the LBT mechanism and data service of carrying out Channel Detection by the fixed cycle based on frame structure and carry out Channel Detection simultaneously, can channel seizure ratio be improved further and reduce time delay.
In view of this, an aspect of of the present present invention proposes the channel detection method of a kind of LTE system when unauthorized band operation, comprising: continue to carry out Channel Detection according to the fixed cycle based on frame structure; When there being data service to arrive, the extra Channel Detection Time based on load is set; According to carrying out the first testing result that Channel Detection obtains according to the described fixed cycle and/or carrying out according to described extra Channel Detection Time the second testing result that Channel Detection obtains, determine whether to send described data service.
In this technical scheme, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, arrive when there being data service (i.e. load) the extra Channel Detection Time namely arranged based on load and together carry out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely carry out by the fixed cycle based on frame structure the machine-processed parallel detection channel of the LBT based on load that namely the LBT mechanism of Channel Detection and data service arrival carry out Channel Detection by combining.In other technical scheme, can also be, channel sensitive manner based on the fixed cycle of frame structure just triggers when data service (i.e. load) arrives and carries out Channel Detection, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, when detecting that channel idle then carries out data service transmission, when channel busy being detected, the extra Channel Detection Time then arranged based on load together carries out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.Both are combined improve channel seizure ratio further and reduce time delay by testing mechanism.To improve channel seizure ratio further and to reduce time delay.
In technique scheme, preferably, when described first testing result and/or described second testing result are channel idle, described data service is sent.
In this technical scheme, as long as there is at least one LBT mechanism wherein to detect that channel idle then sends data service, thus reduces time delay and improve channel seizure ratio.
In technique scheme, preferably, when described first testing result and described second testing result are channel busy, Channel Detection is proceeded; And when described second testing result is busy, select random number N, and in follow-up testing process, if channel busy detected, then N value is constant, if channel idle detected, then N value subtracts 1, until when N value is kept to 0, determines to send described data service; And carrying out in channel detection process according to described extra Channel Detection Time, if the Channel Detection Time of described fixed cycle arrives, then carry out Channel Detection, until channel idle detected simultaneously; And the original position of described extra Channel Detection Time is the original position of subframe.
In this technical scheme, when the channel status detected by two kinds of LBT mechanism is busy, then proceed Channel Detection, and define a kind of method of carrying out channel status detection with indefinite sense cycle based on the LBT mechanism of data service, and when channel status is busy, Stochastic choice Integer N, and repeat to arrange this Channel Detection Time to carry out channel status detection in continuous multiple subframe after the subframe arranging above-mentioned Channel Detection Time, when channel status testing result is idle, N is subtracted 1, and when testing result is busy, N remains unchanged, so, until N is kept to 0, carry out data traffic transmission, and, if be kept to before 0 at N, the Channel Detection Time carrying out Channel Detection by the fixed cycle arrives, then carry out channel status detection simultaneously, until channel idle detected, so, channel status detection can be carried out in multiple continuous print subframe, and combination together detects by the LBT mechanism of fixed cycle, to reduce time delay further and to improve channel seizure ratio.
In this technical scheme, because when data service arrives, namely to carry out the time span of Channel Detection uncertain at every turn, and when channel busy being detected, also Channel Detection will be proceeded, and the number of the Channel Detection Time of the channel idle detected can only be determined, again because channel situation is different, so final Channel Detection Time is also different, in addition, after a Channel holding time, if data service has not passed, also Channel Detection will be proceeded, by the original position of extra Channel Detection Time to be all set to the original position of subframe at every turn, namely the initial time that control channel detects is from the original position of subframe, so at most, the end position of Channel Detection Time is in the middle of subframe, so only have one and half subframes to need process, so, can realize while Channel holding time meets and be no more than maximum channel holding time, channel occupancy is terminated at the end position of certain subframe, to improve channel seizure ratio.
In technique scheme, preferably, the span of N is 1 ~ q, and the span of described q is: 4 ~ 32, and when carrying out described data transmission service, Channel holding time is less than or equal to (13/32) × q.
In technique scheme, preferably, before described data service arrives or the Channel Detection Time of described fixed cycle is set when described data service arrival; And described data service is disposable data service or repeatedly continuity data service.
In this technical scheme, can arrange before data service arrives and carry out the Channel Detection Time of Channel Detection by the fixed cycle, also can after data service arrives, such as, what just determined before coming without any data service carries out Channel Detection at the #9 work song frame of frame structure, if the cycle is 10ms, then there is CCA detection time at each #9 work song frame; Or the time arrived by certain data service is determined, such as certain data service arrives at the #5 work song frame of frame structure, then CCA detection time first time is #5 work song frame, before this data service has passed, CCA based on FBE periodically occurs detection time, if the cycle is 10ms, then there is CCA detection time at each #5 work song frame.
And data service can be disposable data service, can be also repeatedly continuity data service, such as last time, data service also pass, and next data service just arrives, and so this twice data service can be called a continuous print data service.
In technique scheme, preferably, when carrying out Channel Detection by terminal, and the Channel Detection Time of described fixed cycle being set before arriving in described data service, being sent the Channel Detection Time of described fixed cycle and described fixed cycle by base station to described terminal; Or when arranging the Channel Detection Time of described fixed cycle when described data service arrives, send the described fixed cycle by base station to described terminal, and the Channel Detection Time of described fixed cycle is set by described terminal.
In this technical scheme, when carrying out channel status detection by terminal, and the Channel Detection Time of fixed cycle arranged before data service arrives, then cycle and Channel Detection Time need base station to inform terminal, if arrange Channel Detection Time when data service arrives, then terminal receives the cycle from base station and oneself can determine Channel Detection Time, the LBT mechanism of Channel Detection is carried out by the fixed cycle and data service arrives the machine-processed prerequisite guarantee carried out Channel Detection simultaneously and provide strong of the LBT namely carrying out Channel Detection for realizing terminal, to reduce time delay further and to improve channel seizure ratio.
In technique scheme, preferably, when not having downstream data traffic to reach, Channel Detection is carried out in base station in Channel Detection Time, can reduce the time delay of upstream data service transmission further.
Proposing the Channel Detection system of a kind of LTE system when unauthorized band operation according to a further aspect in the invention, comprising: control module, continuing to carry out Channel Detection according to the fixed cycle based on frame structure for controlling; Module is set, for when there being data service to arrive, the extra Channel Detection Time based on load is set; Sending module, for according to carrying out the first testing result that Channel Detection obtains according to the described fixed cycle and/or carrying out according to described extra Channel Detection Time the second testing result that Channel Detection obtains, determines whether to send described data service.
In this technical scheme, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, arrive when there being data service (i.e. load) the extra Channel Detection Time namely arranged based on load and together carry out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely carry out by the fixed cycle based on frame structure the machine-processed parallel detection channel of the LBT based on load that namely the LBT mechanism of Channel Detection and data service arrival carry out Channel Detection by combining.In other technical scheme, can also be, channel sensitive manner based on the fixed cycle of frame structure just triggers when data service (i.e. load) arrives and carries out Channel Detection, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, when detecting that channel idle then carries out data service transmission, when channel busy being detected, the extra Channel Detection Time then arranged based on load together carries out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.Both are combined improve channel seizure ratio further and reduce time delay by testing mechanism.To improve channel seizure ratio further and to reduce time delay.
In technique scheme, preferably, described sending module specifically for: when described first testing result and/or described second testing result are channel idle, send described data service.
In this technical scheme, as long as there is at least one LBT mechanism wherein to detect that channel idle then sends data service, thus reduces time delay and improve channel seizure ratio.
In technique scheme, preferably, described control module also for: when described first testing result and described second testing result are channel busy, control proceed Channel Detection; And when described second testing result is busy, control to select random number N, and in follow-up testing process, if channel busy detected, then control N value is constant, if channel idle detected, then control N value subtracts 1, until when N value is kept to 0, determines to send described data service; And carrying out in channel detection process according to described extra Channel Detection Time, if the Channel Detection Time of described fixed cycle arrives, then control to carry out Channel Detection, until channel idle detected simultaneously; And described arrange module also for: the original position arranging described extra Channel Detection Time is the original position of subframe.
In this technical scheme, when the channel status detected by two kinds of LBT mechanism is busy, then proceed Channel Detection, and define a kind of method of carrying out channel status detection with indefinite sense cycle based on the LBT mechanism of data service, and when channel status is busy, Stochastic choice Integer N, and repeat to arrange this Channel Detection Time to carry out channel status detection in continuous multiple subframe after the subframe arranging above-mentioned Channel Detection Time, when channel status testing result is idle, N is subtracted 1, and when testing result is busy, N remains unchanged, so, until N is kept to 0, carry out data traffic transmission, and, if be kept to before 0 at N, the Channel Detection Time carrying out Channel Detection by the fixed cycle arrives, then carry out channel status detection simultaneously, until channel idle detected, so, channel status detection can be carried out in multiple continuous print subframe, and combination together detects by the LBT mechanism of fixed cycle, to reduce time delay further and to improve channel seizure ratio.
In this technical scheme, because when data service arrives, namely to carry out the time span of Channel Detection uncertain at every turn, and when channel busy being detected, also Channel Detection will be proceeded, and the number of the Channel Detection Time of the channel idle detected can only be determined, again because channel situation is different, so final Channel Detection Time is also different, in addition, after a Channel holding time, if data service has not passed, also Channel Detection will be proceeded, by the original position of extra Channel Detection Time to be all set to the original position of subframe at every turn, namely the initial time that control channel detects is from the original position of subframe, so at most, the end position of Channel Detection Time is in the middle of subframe, so only have one and half subframes to need process, so, can realize while Channel holding time meets and be no more than maximum channel holding time, channel occupancy is terminated at the end position of certain subframe, to improve channel seizure ratio.
In technique scheme, preferably, the span of N is 1 ~ q, and the span of described q is: 4 ~ 32, and when carrying out described data transmission service, Channel holding time is less than or equal to (13/32) × q.
In technique scheme, preferably, described module is set also for the Channel Detection Time that arranges the described fixed cycle before described data service arrives or when described data service arrival; And described data service is disposable data service or repeatedly continuity data service.
In this technical scheme, can arrange before data service arrives and carry out the Channel Detection Time of Channel Detection by the fixed cycle, also can after data service arrives, such as, what just determined before coming without any data service carries out Channel Detection at the #9 work song frame of frame structure, if the cycle is 10ms, then there is CCA detection time at each #9 work song frame; Or the time arrived by certain data service is determined, such as certain data service arrives at the #5 work song frame of frame structure, then CCA detection time first time is #5 work song frame, before this data service has passed, CCA based on FBE periodically occurs detection time, if the cycle is 10ms, then there is CCA detection time at each #5 work song frame.
And data service can be disposable data service, can be also repeatedly continuity data service, such as last time, data service also pass, and next data service just arrives, and so this twice data service can be called a continuous print data service.
In technique scheme, preferably, described control module also for: when carrying out Channel Detection by terminal, and the Channel Detection Time of described fixed cycle is set before arriving in described data service, control the Channel Detection Time being sent described fixed cycle and described fixed cycle by base station to described terminal; Or when arranging the Channel Detection Time of described fixed cycle when described data service arrives, control to send the described fixed cycle by base station to described terminal, and control the Channel Detection Time that the described fixed cycle is set by described terminal.
In this technical scheme, when carrying out channel status detection by terminal, and the Channel Detection Time of fixed cycle arranged before data service arrives, then cycle and Channel Detection Time need base station to inform terminal, if arrange Channel Detection Time when data service arrives, then terminal receives the cycle from base station and oneself can determine Channel Detection Time, the LBT mechanism of Channel Detection is carried out by the fixed cycle and data service arrives the machine-processed prerequisite guarantee carried out Channel Detection simultaneously and provide strong of the LBT namely carrying out Channel Detection for realizing terminal, to reduce time delay further and to improve channel seizure ratio.
In technique scheme, preferably, described control module also for: when not having downstream data traffic to reach, control base station in Channel Detection Time, carry out Channel Detection, can reduce further upstream data service transmission time delay.
According to another aspect of the invention, propose a kind of base station, comprising: the Channel Detection system of the LTE system as above described in any one technical scheme when unauthorized band operation.
In this technical scheme, base station is by the Channel Detection system of this LTE system when unauthorized band operation, when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, arrive when there being data service (i.e. load) the extra Channel Detection Time namely arranged based on load and together carry out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.In other technical scheme, can also be, channel sensitive manner based on the fixed cycle of frame structure just triggers when data service (i.e. load) arrives and carries out Channel Detection, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, when detecting that channel idle then carries out data service transmission, when channel busy being detected, the extra Channel Detection Time then arranged based on load together carries out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.Both are combined improve channel seizure ratio further and reduce time delay by testing mechanism.To improve channel seizure ratio further and to reduce time delay.
In accordance with a further aspect of the present invention, propose a kind of terminal, comprising: the Channel Detection system of the LTE system as above described in any one technical scheme when unauthorized band operation.
In this technical scheme, terminal is by the Channel Detection system of this LTE system when unauthorized band operation, when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, arrive when there being data service (i.e. load) the extra Channel Detection Time namely arranged based on load and together carry out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.In other technical scheme, can also be, channel sensitive manner based on the fixed cycle of frame structure just triggers when data service (i.e. load) arrives and carries out Channel Detection, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, when detecting that channel idle then carries out data service transmission, when channel busy being detected, the extra Channel Detection Time then arranged based on load together carries out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.Both are combined improve channel seizure ratio further and reduce time delay by testing mechanism.To improve channel seizure ratio further and to reduce time delay.
By technical scheme of the present invention, arrive the LBT mechanism based on load of namely carrying out Channel Detection in conjunction with the LBT mechanism and data service of carrying out Channel Detection by the fixed cycle based on frame structure and carry out Channel Detection simultaneously, can channel seizure ratio be improved further and reduce time delay.
Accompanying drawing explanation
Fig. 1 shows the schematic diagram of two kinds of working methods of unlicensed spectrum;
Regular schematic diagram is avoided in the interference that Fig. 2 shows Wi-Fi system;
Fig. 3 shows the schematic diagram of frame based LBT frame structure;
Fig. 4 shows the probability schematic diagram of busy channel when equipment uses FBE and LBE respectively;
Fig. 5 shows the schematic flow sheet of the channel detection method of LTE system when unauthorized band operation according to an embodiment of the invention;
Fig. 6 shows the structural representation of the Channel Detection system of LTE system when unauthorized band operation according to an embodiment of the invention;
Fig. 7 show random number N be according to an embodiment of the invention taken as 8 and Channel Detection Time original position be positioned at the Channel holding time schematic diagram of subframe original position;
Fig. 8 shows the structural representation of base station according to an embodiment of the invention;
Fig. 9 shows the structural representation 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. 5 shows the schematic flow sheet of the channel detection method of LTE system when unauthorized band operation according to an embodiment of the invention.
As shown in Figure 5, the channel detection method of LTE system when unauthorized band operation, comprising: step 502 according to an embodiment of the invention, continues to carry out Channel Detection according to the fixed cycle based on frame structure; Step 504, when there being data service to arrive, arranges the extra Channel Detection Time based on load; Step 506, according to carrying out the first testing result that Channel Detection obtains according to the described fixed cycle and/or carrying out according to described extra Channel Detection Time the second testing result that Channel Detection obtains, determines whether to send described data service.
In this technical scheme, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, arrive when there being data service (i.e. load) the extra Channel Detection Time namely arranged based on load and together carry out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely carry out by the fixed cycle based on frame structure the machine-processed parallel detection channel of the LBT based on load that namely the LBT mechanism of Channel Detection and data service arrival carry out Channel Detection by combining.In other technical scheme, can also be, channel sensitive manner based on the fixed cycle of frame structure just triggers when data service (i.e. load) arrives and carries out Channel Detection, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, when detecting that channel idle then carries out data service transmission, when channel busy being detected, the extra Channel Detection Time then arranged based on load together carries out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.Both are combined improve channel seizure ratio further and reduce time delay by testing mechanism.To improve channel seizure ratio further and to reduce time delay.
In technique scheme, preferably, when described first testing result and/or described second testing result are channel idle, described data service is sent.
In this technical scheme, as long as there is at least one LBT mechanism wherein to detect that channel idle then sends data service, thus reduces time delay and improve channel seizure ratio.
In technique scheme, preferably, when described first testing result and described second testing result are channel busy, Channel Detection is proceeded; And when described second testing result is busy, select random number N, and in follow-up testing process, if channel busy detected, then N value is constant, if channel idle detected, then N value subtracts 1, until when N value is kept to 0, determines to send described data service; And carrying out in channel detection process according to described extra Channel Detection Time, if the Channel Detection Time of described fixed cycle arrives, then carry out Channel Detection, until channel idle detected simultaneously; And the original position of described extra Channel Detection Time is the original position of subframe.
In this technical scheme, when the channel status detected by two kinds of LBT mechanism is busy, then proceed Channel Detection, and define a kind of method of carrying out channel status detection with indefinite sense cycle based on the LBT mechanism of data service, and when channel status is busy, Stochastic choice Integer N, and repeat to arrange this Channel Detection Time to carry out channel status detection in continuous multiple subframe after the subframe arranging above-mentioned Channel Detection Time, when channel status testing result is idle, N is subtracted 1, and when testing result is busy, N remains unchanged, so, until N is kept to 0, carry out data traffic transmission, and, if be kept to before 0 at N, the Channel Detection Time carrying out Channel Detection by the fixed cycle arrives, then carry out channel status detection simultaneously, until channel idle detected, so, channel status detection can be carried out in multiple continuous print subframe, and combination together detects by the LBT mechanism of fixed cycle, to reduce time delay further and to improve channel seizure ratio.
In this technical scheme, because when data service arrives, namely to carry out the time span of Channel Detection uncertain at every turn, and when channel busy being detected, also Channel Detection will be proceeded, and the number of the Channel Detection Time of the channel idle detected can only be determined, again because channel situation is different, so final Channel Detection Time is also different, in addition, after a Channel holding time, if data service has not passed, also Channel Detection will be proceeded, by the original position of extra Channel Detection Time to be all set to the original position of subframe at every turn, namely the initial time that control channel detects is from the original position of subframe, so at most, the end position of Channel Detection Time is in the middle of subframe, so only have one and half subframes to need process, so, can realize while Channel holding time meets and be no more than maximum channel holding time, channel occupancy is terminated at the end position of certain subframe, to improve channel seizure ratio.
In technique scheme, preferably, the span of N is 1 ~ q, and the span of described q is: 4 ~ 32, and when carrying out described data transmission service, Channel holding time is less than or equal to (13/32) × q.As shown in Figure 7, the LBT cycle is 10ms, q value is 16, N value is 8, then Channel holding time is less than or equal to 6.5ms, and namely channel occupancy maximum time is (13/32) × 16=6.5ms, then when satisfied each original position based on the extra Channel Detection Time of load is subframe original position, the time of each channel occupancy is incomplete same, namely meet be no more than the prerequisite of maximum holding time under, terminate at subframe end position; Certainly, if data service has passed in the middle of subframe, then without the need to considering above-mentioned rule, so, channel seizure ratio can have been improved.
In technique scheme, preferably, before described data service arrives or the Channel Detection Time of described fixed cycle is set when described data service arrival; And described data service is disposable data service or repeatedly continuity data service.
In this technical scheme, can arrange before data service arrives and carry out the Channel Detection Time of Channel Detection by the fixed cycle, also can after data service arrives, such as, what just determined before coming without any data service carries out Channel Detection at the #9 work song frame of frame structure, if the cycle is 10ms, then there is CCA detection time at each #9 work song frame; Or the time arrived by certain data service is determined, such as certain data service arrives at the #5 work song frame of frame structure, then CCA detection time first time is #5 work song frame, before this data service has passed, CCA based on FBE periodically occurs detection time, if the cycle is 10ms, then there is CCA detection time at each #5 work song frame.
And data service can be disposable data service, can be also repeatedly continuity data service, such as last time, data service also pass, and next data service just arrives, and so this twice data service can be called a continuous print data service.
In technique scheme, preferably, when carrying out Channel Detection by terminal, and the Channel Detection Time of described fixed cycle being set before arriving in described data service, being sent the Channel Detection Time of described fixed cycle and described fixed cycle by base station to described terminal; Or when arranging the Channel Detection Time of described fixed cycle when described data service arrives, send the described fixed cycle by base station to described terminal, and the Channel Detection Time of described fixed cycle is set by described terminal.
In this technical scheme, when carrying out channel status detection by terminal, and the Channel Detection Time of fixed cycle arranged before data service arrives, then cycle and Channel Detection Time need base station to inform terminal, if arrange Channel Detection Time when data service arrives, then terminal receives the cycle from base station and oneself can determine Channel Detection Time, the LBT mechanism of Channel Detection is carried out by the fixed cycle and data service arrives the machine-processed prerequisite guarantee carried out Channel Detection simultaneously and provide strong of the LBT namely carrying out Channel Detection for realizing terminal, to reduce time delay further and to improve channel seizure ratio.
In technique scheme, preferably, when not having downstream data traffic to reach, Channel Detection is carried out in base station in Channel Detection Time, can reduce the time delay of upstream data service transmission further.
Fig. 6 shows the structural representation of the Channel Detection system of LTE system when unauthorized band operation according to an embodiment of the invention.
As shown in Figure 6, the Channel Detection system 600 of LTE system when unauthorized band operation, comprising: control module 602 according to an embodiment of the invention, continues to carry out Channel Detection according to the fixed cycle based on frame structure for controlling; Module 604 is set, for when there being data service to arrive, extra Channel Detection Time is set; Sending module 606, for according to carrying out the first testing result that Channel Detection obtains according to the described fixed cycle and/or carrying out according to described extra Channel Detection Time the second testing result that Channel Detection obtains, determines whether to send described data service.
In this technical scheme, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, arrive when there being data service (i.e. load) the extra Channel Detection Time namely arranged based on load and together carry out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely carry out by the fixed cycle based on frame structure the machine-processed parallel detection channel of the LBT based on load that namely the LBT mechanism of Channel Detection and data service arrival carry out Channel Detection by combining.In other technical scheme, can also be, channel sensitive manner based on the fixed cycle of frame structure just triggers when data service (i.e. load) arrives and carries out Channel Detection, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, when detecting that channel idle then carries out data service transmission, when channel busy being detected, the extra Channel Detection Time then arranged based on load together carries out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.Both are combined improve channel seizure ratio further and reduce time delay by testing mechanism.To improve channel seizure ratio further and to reduce time delay.
In technique scheme, preferably, described sending module 606 specifically for: when described first testing result and/or described second testing result are channel idle, send described data service.
In this technical scheme, as long as there is at least one LBT mechanism wherein to detect that channel idle then sends data service, thus reduces time delay and improve channel seizure ratio.
In technique scheme, preferably, described control module 602 also for: when described first testing result and described second testing result are channel busy, control proceed Channel Detection; And when described second testing result is busy, control to select random number N, and in follow-up testing process, if channel busy detected, then control N value is constant, if channel idle detected, then control N value subtracts 1, until when N value is kept to 0, determines to send described data service; And carrying out in channel detection process according to described extra Channel Detection Time, if the Channel Detection Time of described fixed cycle arrives, then control to carry out Channel Detection, until channel idle detected simultaneously; And described arrange module 604 also for: the original position arranging described extra Channel Detection Time is the original position of subframe.
In this technical scheme, when the channel status detected by two kinds of LBT mechanism is busy, then proceed Channel Detection, and define a kind of method of carrying out channel status detection with indefinite sense cycle based on the LBT mechanism of data service, and when channel status is busy, Stochastic choice Integer N, and repeat to arrange this Channel Detection Time to carry out channel status detection in continuous multiple subframe after the subframe arranging above-mentioned Channel Detection Time, when channel status testing result is idle, N is subtracted 1, and when testing result is busy, N remains unchanged, so, until N is kept to 0, carry out data traffic transmission, and, if be kept to before 0 at N, the Channel Detection Time carrying out Channel Detection by the fixed cycle arrives, then carry out channel status detection simultaneously, until channel idle detected, so, channel status detection can be carried out in multiple continuous print subframe, and combination together detects by the LBT mechanism of fixed cycle, to reduce time delay further and to improve channel seizure ratio.
In this technical scheme, because when data service arrives, namely to carry out the time span of Channel Detection uncertain at every turn, and when channel busy being detected, also Channel Detection will be proceeded, and the number of the Channel Detection Time of the channel idle detected can only be determined, again because channel situation is different, so final Channel Detection Time is also different, in addition, after a Channel holding time, if data service has not passed, also Channel Detection will be proceeded, by the original position of extra Channel Detection Time to be arranged the original position being subframe at every turn, namely the initial time that control channel detects is from the original position of subframe, so at most, the end position of Channel Detection Time is in the middle of subframe, so only have one and half subframes to need process, so, can realize while Channel holding time meets and be no more than maximum channel holding time, channel occupancy is terminated at the end position of certain subframe, to improve channel seizure ratio.
In technique scheme, preferably, the span of N is 1 ~ q, and the span of described q is: 4 ~ 32, and when carrying out described data transmission service, Channel holding time is less than or equal to (13/32) × q.As shown in Figure 7, the LBT cycle is 10ms, q value is 16, N value is 8, then Channel holding time is less than or equal to 6.5ms, and namely channel occupancy maximum time is (13/32) × 16=6.5ms, then when satisfied each original position based on the extra Channel Detection Time of load is subframe original position, the time of each channel occupancy is incomplete same, namely meet be no more than the prerequisite of maximum holding time under, terminate at subframe end position; Certainly, if data service has passed in the middle of subframe, then without the need to considering above-mentioned rule, so, channel seizure ratio can have been improved.
In technique scheme, preferably, described module 604 is set also for the Channel Detection Time that arranges the described fixed cycle before described data service arrives or when described data service arrival; And described data service is disposable data service or repeatedly continuity data service.
In this technical scheme, can arrange before data service arrives and carry out the Channel Detection Time of Channel Detection by the fixed cycle, also can after data service arrives, such as, what just determined before coming without any data service carries out Channel Detection at the #9 work song frame of frame structure, if the cycle is 10ms, then there is CCA detection time at each #9 work song frame; Or the time arrived by certain data service is determined, such as certain data service arrives at the #5 work song frame of frame structure, then CCA detection time first time is #5 work song frame, before this data service has passed, CCA based on FBE periodically occurs detection time, if the cycle is 10ms, then there is CCA detection time at each #5 work song frame.
And data service can be disposable data service, can be also repeatedly continuity data service, such as last time, data service also pass, and next data service just arrives, and so this twice data service can be called a continuous print data service.
In technique scheme, preferably, described control module also 602 for: when carrying out Channel Detection by terminal, and the Channel Detection Time of described fixed cycle is set before arriving in described data service, control the Channel Detection Time being sent described fixed cycle and described fixed cycle by base station to described terminal; Or when arranging the Channel Detection Time of described fixed cycle when described data service arrives, control to send the described fixed cycle by base station to described terminal, and control the Channel Detection Time that the described fixed cycle is set by described terminal.
In this technical scheme, when carrying out channel status detection by terminal, and the Channel Detection Time of fixed cycle arranged before data service arrives, then cycle and Channel Detection Time need base station to inform terminal, if arrange Channel Detection Time when data service arrives, then terminal receives the cycle from base station and oneself can determine Channel Detection Time, the LBT mechanism of Channel Detection is carried out by the fixed cycle and data service arrives the machine-processed prerequisite guarantee carried out Channel Detection simultaneously and provide strong of the LBT namely carrying out Channel Detection for realizing terminal, to reduce time delay further and to improve channel seizure ratio.
In technique scheme, preferably, described control module 602 also for: when not having downstream data traffic to reach, control base station in Channel Detection Time, carry out Channel Detection, can reduce further upstream data service transmission time delay.
Fig. 8 shows the structural representation of base station according to an embodiment of the invention.
As shown in Figure 8, base station 800 according to an embodiment of the invention, comprising: the Channel Detection system 600 of the LTE system as above described in any one technical scheme when unauthorized band operation.
In this technical scheme, base station 800 is by the Channel Detection system 600 of this LTE system when unauthorized band operation, when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, arrive when there being data service (i.e. load) the extra Channel Detection Time namely arranged based on load and together carry out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.In other technical scheme, can also be, channel sensitive manner based on the fixed cycle of frame structure just triggers when data service (i.e. load) arrives and carries out Channel Detection, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, when detecting that channel idle then carries out data service transmission, when channel busy being detected, the extra Channel Detection Time then arranged based on load together carries out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.Both are combined improve channel seizure ratio further and reduce time delay by testing mechanism.To improve channel seizure ratio further and to reduce time delay.
Fig. 9 has gone out the structural representation of terminal according to an embodiment of the invention.
As shown in Figure 9, terminal 900 according to an embodiment of the invention, comprising: the Channel Detection system 600 of the LTE system as above described in any one technical scheme when unauthorized band operation.
In this technical scheme, terminal 900 is by the Channel Detection system 600 of this LTE system when unauthorized band operation, when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, arrive when there being data service (i.e. load) the extra Channel Detection Time namely arranged based on load and together carry out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.In other technical scheme, can also be, channel sensitive manner based on the fixed cycle of frame structure just triggers when data service (i.e. load) arrives and carries out Channel Detection, LTE system is when unauthorized band operation, first continue to carry out Channel Detection according to the fixed cycle based on frame structure, when detecting that channel idle then carries out data service transmission, when channel busy being detected, the extra Channel Detection Time then arranged based on load together carries out Channel Detection, and determine whether to send data service based on the result of two kinds of channel status testing mechanisms, namely the LBT mechanism of Channel Detection is carried out by the fixed cycle based on frame structure and data service arrives the machine-processed parallel detection channel of the LBT based on load namely carrying out Channel Detection by combining.Both are combined improve channel seizure ratio further and reduce time delay by testing mechanism.To improve channel seizure ratio further and to reduce time delay.
More than be described with reference to the accompanying drawings technical scheme of the present invention, arrive the LBT mechanism based on load of namely carrying out Channel Detection in conjunction with the LBT mechanism and data service of carrying out Channel Detection by the fixed cycle based on frame structure and carry out Channel Detection simultaneously, can channel seizure ratio be improved further and reduce time delay.
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 (12)
1. the channel detection method of LTE system when unauthorized band operation, is characterized in that, comprising:
Continue to carry out Channel Detection according to the fixed cycle based on frame structure;
When there being data service to arrive, the extra Channel Detection Time based on load is set;
According to carrying out the first testing result that Channel Detection obtains according to the described fixed cycle and/or carrying out according to described extra Channel Detection Time the second testing result that Channel Detection obtains, determine whether to send described data service.
2. the channel detection method of LTE system according to claim 1 when unauthorized band operation, is characterized in that, when described first testing result and/or described second testing result are channel idle, sends described data service.
3. the channel detection method of LTE system according to claim 1 when unauthorized band operation, is characterized in that, when described first testing result and described second testing result are channel busy, proceeds Channel Detection; And
When described second testing result is busy, select random number N, and in follow-up testing process, if channel busy detected, then N value is constant, if channel idle detected, then N value subtracts 1, until when N value is kept to 0, determines to send described data service; And
Carrying out in channel detection process according to described extra Channel Detection Time, if the Channel Detection Time of described fixed cycle arrives, then carrying out Channel Detection, until channel idle detected simultaneously; And
The original position of described extra Channel Detection Time is the original position of subframe.
4. the channel detection method of LTE system according to any one of claim 1 to 3 when unauthorized band operation, is characterized in that, before described data service arrives or arrange the Channel Detection Time of described fixed cycle when described data service arrival; And
Described data service is disposable data service or repeatedly continuity data service.
5. the channel detection method of LTE system according to claim 4 when unauthorized band operation, is characterized in that, when carrying out Channel Detection by terminal, and
The Channel Detection Time of described fixed cycle is set before arriving in described data service, is sent the Channel Detection Time of described fixed cycle and described fixed cycle by base station to described terminal; Or
When arranging the Channel Detection Time of described fixed cycle when described data service arrives, send the described fixed cycle by base station to described terminal, and the Channel Detection Time of described fixed cycle is set by described terminal.
6. the Channel Detection system of LTE system when unauthorized band operation, is characterized in that, comprising:
Control module, continues to carry out Channel Detection according to the fixed cycle based on frame structure for controlling;
Module is set, for when there being data service to arrive, the extra Channel Detection Time based on load is set;
Sending module, for according to carrying out the first testing result that Channel Detection obtains according to the described fixed cycle and/or carrying out according to described extra Channel Detection Time the second testing result that Channel Detection obtains, determines whether to send described data service.
7. the Channel Detection system of LTE system according to claim 6 when unauthorized band operation, it is characterized in that, described sending module specifically for: when described first testing result and/or described second testing result are channel idle, send described data service.
8. the Channel Detection system of LTE system according to claim 6 when unauthorized band operation, it is characterized in that, described control module also for: when described first testing result and described second testing result are channel busy, control proceed Channel Detection; And
When described second testing result is busy, control to select random number N, and in follow-up testing process, if channel busy detected, then control N value is constant, if channel idle detected, then control N value subtracts 1, until when N value is kept to 0, determines to send described data service; And
Carrying out in channel detection process according to described extra Channel Detection Time, if the Channel Detection Time of described fixed cycle arrives, then controlling to carry out Channel Detection, until channel idle detected simultaneously; And
Described arrange module also for: the original position arranging described extra Channel Detection Time is the original position of subframe.
9. the Channel Detection system of the LTE system according to any one of claim 6 to 8 when unauthorized band operation, it is characterized in that, described module is set also for the Channel Detection Time that arranges the described fixed cycle before described data service arrives or when described data service arrival; And
Described data service is disposable data service or repeatedly continuity data service.
10. the Channel Detection system of LTE system according to claim 9 when unauthorized band operation, is characterized in that, described control module also for: when carrying out Channel Detection by terminal, and
The Channel Detection Time of described fixed cycle is set before arriving in described data service, controls the Channel Detection Time being sent described fixed cycle and described fixed cycle by base station to described terminal; Or
When arranging the Channel Detection Time of described fixed cycle when described data service arrives, control to send the described fixed cycle by base station to described terminal, and control the Channel Detection Time that the described fixed cycle is set by described terminal.
11. 1 kinds of base stations, is characterized in that, comprise the Channel Detection system of LTE system when unauthorized band operation according to any one of claim 6 to 10.
12. 1 kinds of terminals, is characterized in that, comprise the Channel Detection system of LTE system when unauthorized band operation according to any one of claim 6 to 10.
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