CN106658718A - Method and system for improving LAA uplink transmission performance - Google Patents
Method and system for improving LAA uplink transmission performance Download PDFInfo
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- CN106658718A CN106658718A CN201510726306.XA CN201510726306A CN106658718A CN 106658718 A CN106658718 A CN 106658718A CN 201510726306 A CN201510726306 A CN 201510726306A CN 106658718 A CN106658718 A CN 106658718A
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- Prior art keywords
- grant message
- user terminal
- cca
- unauthorized carrier
- carrier wave
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
Abstract
The invention discloses a method and system for improving the LAA uplink transmission performance. The method comprises the steps: transmitting an uplink scheduling request and a caching state report to a base station when a user terminal carries out the uplink transmission; enabling the base station to select a corresponding unauthorized carrier according to the caching state report transmitted by the user terminal, all current carrier load conditions and unauthorized carrier interference conditions, transmitting an uplink scheduling authorization UL grant message to the user terminal, wherein the UL grant message comprises unauthorized carrier indication information used by the uplink transmission of the user terminal, and uplink transmission resource distribution information; carrying out the spare channel assessment of the unauthorized carrier indicated by the UL grant message after the user terminal receives the UL grant message; enabling the user terminal to carry out the uplink transmission on the uplink transmission resource of an unauthorized carrier indicated by the UL grant message at a specific moment if the unauthorized carrier channel indicated by the UL grant message is spare and available. The method improves the uplink access probability of the terminal, reduces the CCA detection conflict among the terminals of a local cell, and makes the most of uplink scheduling resources.
Description
Technical field
The present invention relates to moving communicating field, more particularly to a kind of lifting LAA upstream performances
Method and system.
Background technology
The popularization on a large scale developed rapidly with intelligent terminal of mobile Internet, data traffic explodes
So that the multiplication of existing network capacity pressure.In order to solve the problems, such as mobile network's capacity, on the one hand need
The utilization rate of existing frequency spectrum is lifted by technological innovation, on the other hand needs to seek more frequency spectrums
Resource.
At present 3GPP primary studies in Release 13 LAA (License Assisted Access,
Auxiliary is authorized to access) technology as solves the problems, such as the key of LTE network dilatation using unlicensed spectrum
One of technology, the technology can be realized under the assistance for authorizing frequency spectrum, by way of carrier aggregation
LTE is deployed in into unauthorized frequency range, the substantial amounts of available unlicensed spectrum of 5GHz frequency ranges is made full use of
Resource.
Unlike LAA and CA (Carrier Aggregation, CA)：CA is mandate frequency range
Carrier availability problem need not be considered, multiple carrier wave up-downgoing scheduling are carried out by base station.LAA is utilized
Unlicensed spectrum carries out downstream transmission, in order to coexist (such as Wi-Fi, thunder with other systems close friend
Up to and other LAA systems etc.), need before transmission to detect channel status.
Some countries and regions define to be needed to carry out LBT (Listen before transmitting the data
Before Talk) listem-before-talk operation, i.e., CCA (Clear are carried out before data is transmitted
Channel Assessment, clear channel assessment (CCA)) determining channel upstate, it is to avoid to it
He produces interference at system.In prior art, RAN1 is to LAA deployment scenarios and various LBT
Technical scheme is estimated discussion.LBT schemes are divided into into four in 3GPP conceptual phases assessment at present
Class：1st, LBT it is not；2nd, the LBT based on FBE (Frame Based Equipment)；
3rd, the LBE (Load Based Equipment) based on fixed competition window；4th, based on variable
The LBE (Load Based Equipment) of competition window.But for up in prior art
LBT is carried out by base station or terminal, it is not clear and definite using which kind of LBT scheme.
Therefore, it is necessary to propose how a kind of up CCA methods carry out LBT with clear and definite terminal, together
When reduce the detection conflict of CCA between this cell terminal, ensure making full use of for uplink scheduling resource, with
Improve upstream performance.
The content of the invention
The invention solves the problems that a technical problem be how a kind of up CCA methods are provided, subtract
CCA detections conflict between few this cell terminal, it is ensured that making full use of for uplink scheduling resource, realizes
Close friend coexists.
The present invention provides a kind of method of lifting LAA upstream performances, including：User's end
End sends uplink scheduling request and buffer status report when uplink is carried out to base station；
Buffer status report that base station sends according to user terminal, current all carrier load situations and
Unauthorized carrier-in-interference situation, selects corresponding unauthorized carrier wave, and sends to user terminal
Row scheduling authorization UL grant message, includes user terminal uplink in UL grant message
The unauthorized carrier indication information for using and uplink transmission resource distribution information；User terminal is received
After UL grant message, idle channel is carried out to the unauthorized carrier wave that UL grant message is indicated
Assessment；If the unauthorized carrier channel that UL grant message is indicated is idle available, user's end
Hold the uplink transmission resource of the unauthorized carrier wave at the specified moment, indicating in UL grant message
On carry out uplink.
Further, base station sends uplink scheduling authorization UL grant message to user terminal
Step includes：Base station sends UL grant message in n-th subframe.
Further, user terminal carries out sky to the unauthorized carrier wave that UL grant message is indicated
The step of channel assessment, includes：User terminal is in the designated symbols position of the n-th+3 subframes
On, clear channel assessment (CCA) is carried out to the unauthorized carrier wave that UL grant message is indicated；The finger
Timing is carved as first symbol of the n-th+4 subframes.
Further, user terminal is received after UL grant message, in UL grant message
The step of carrying out clear channel assessment (CCA) on the unauthorized carrier wave for indicating includes：Receiving UL
After grant message, in same subframe each user terminal in the same cells of uplink scheduling is carried out
The unauthorized carrier wave that UL grant message is indicated is carried out based on the idle channel of contention window simultaneously
Assessment；If first user terminal determines that the unauthorized carrier channel that UL grant message is indicated is empty
Spare time is available, then with busy channel, other are used the up preserved signal RS for sending this cell-specific
Family terminal stops carrying out clear channel assessment (CCA) after the RS for detecting this cell-specific.
Further, user terminal is received after UL grant message, in UL grant message
The step of carrying out clear channel assessment (CCA) on the unauthorized carrier wave for indicating includes：Receiving UL
After grant message, in same subframe each user terminal in the same cells of uplink scheduling is carried out
The unauthorized carrier wave that UL grant message is indicated is carried out based on the idle channel of contention window simultaneously
Assessment, wherein each user terminal has identical contention window and fallback counter parameter, so as to
The maximum clear channel assessment (CCA) time of each user is identical.
Further, each user terminal is when clear channel assessment (CCA) fails, if not arriving maximum
The clear channel assessment (CCA) time, then the clear channel assessment (CCA) of extension is continued executing with, it is right to continue
The unauthorized carrier wave that UL grant message is indicated carries out clear channel assessment (CCA).
Further, the unauthorized carrier wave that user terminal is indicated in UL grant message it is up
The step of uplink is carried out on transfer resource includes：If user terminal takes continuous subframes and carries out
Transmission, then between continuous subframes not to UL grant message indicate unauthorized carrier wave carry out
Clear channel assessment (CCA).
The present invention also provides a kind of system of lifting LAA upstream performances, including：User
Terminal, for when uplink is carried out, to base station uplink scheduling request and caching shape being sent
State is reported；After the UL grant message for receiving base station transmission, UL grant message is indicated
Unauthorized carrier wave carry out clear channel assessment (CCA)；If the unauthorized load that UL grant message is indicated
Ripple channel idle can use, then at the specified moment, in the unauthorized load that UL grant message is indicated
Uplink is carried out in the uplink transmission resource of ripple；Base station, for what is sent according to user terminal
Buffer status report, current all carrier load situations and unauthorized carrier-in-interference situation, choosing
Corresponding unauthorized carrier wave is selected, and uplink scheduling authorization UL grant are sent to user terminal and disappeared
Breath, indicates in UL grant message comprising the unauthorized carrier wave that user terminal uplink is used
Information and uplink transmission resource distribution information.
Further, base station specifically sends UL grant message in n-th subframe；User's end
End specifically on the designated symbols position of the n-th+3 subframes, is indicated UL grant message
Unauthorized carrier wave carries out clear channel assessment (CCA)；The wherein described specified moment is the n-th+4 subframes
First symbol.
Further, after UL grant message is received, in same subframe uplink scheduling is carried out
Same cells in each user terminal unauthorized carrier wave that UL grant message is indicated simultaneously
Carry out based on the clear channel assessment (CCA) of contention window；Wherein first user terminal is it is determined that UL
When the unauthorized carrier channel free time that grant message is indicated can use, up this cell-specific of transmission
Preserved signal RS with busy channel, other user terminals are detecting this cell-specific
Stop carrying out clear channel assessment (CCA) after RS.
Further, after UL grant message is received, in same subframe uplink scheduling is carried out
Same cells in each user terminal unauthorized carrier wave that UL grant message is indicated simultaneously
Carry out based on the clear channel assessment (CCA) of contention window, there is wherein each user terminal identical to compete
Window and fallback counter parameter, so as to the maximum clear channel assessment (CCA) time of each user it is identical.
Further, each user terminal is additionally operable to when clear channel assessment (CCA) fails, if not
To the maximum clear channel assessment (CCA) time, then continue executing with the clear channel assessment (CCA) of extension, so as to after
It is continuous that clear channel assessment (CCA) is carried out to the unauthorized carrier wave that UL grant message is indicated.
Further, user terminal is additionally operable to when occupancy continuous subframes are transmitted, even
Idle channel is not carried out between continuous subframe to the unauthorized carrier wave that UL grant message is indicated to comment
Estimate.
The method and system of the lifting LAA upstream performances that the present invention is provided, terminal is utilized
Unlicensed spectrum carries out uplink, be given LBT and transmitting uplink data timing relationship and on
Row data transmission procedure, the method for up clear channel assessment (CCA) is lifting terminal uplink access probability
While, reduce between this cell terminal CCA detection conflicts, it is ensured that uplink scheduling resource it is abundant
Utilize, realize that close friend coexists.
Description of the drawings
Fig. 1 illustrates the stream of the method for the lifting LAA upstream performances of one embodiment of the invention
Cheng Tu.
Fig. 2 is the schematic diagram for describing hidden node problem.
Fig. 3 illustrates the terminal of one embodiment of the invention and base station schematic diagram of a scenario.
Fig. 4 illustrates one embodiment of the invention LBT and transmitting uplink data time diagram.
Fig. 5 illustrates one embodiment of the invention using fixed contention window and fallback counter data transfer
Time diagram.
What Fig. 6 illustrated a kind of lifting LAA upstream performances of one embodiment of the invention is
System,
Specific embodiment
The present invention is described more fully with reference to the accompanying drawings, wherein illustrating the example of the present invention
Property embodiment.
Fig. 1 illustrates the stream of the method for the lifting LAA upstream performances of one embodiment of the invention
Cheng Tu, as shown in figure 1, the method mainly includes：
Step 100, when uplink is carried out, sending uplink scheduling to base station please for user terminal
Ask (SR) and buffer status report (BSR).
Step 102, buffer status report, current all loads that base station sends according to user terminal
Carrier load situation and unauthorized carrier-in-interference situation, the corresponding unauthorized carrier wave of selection, and to
User terminal sends UL grant (uplink scheduling authorization) message, wraps in UL grant message
Unauthorized carrier indication information and uplink transmission resource distribution that uplink containing user terminal is used
Information.
Step 104, user terminal is received after UL grant message, and UL grant message is referred to
The unauthorized carrier wave for showing carries out clear channel assessment (CCA)；
Step 106, if the unauthorized carrier channel that UL grant message is indicated is idle available,
Then user terminal is at the specified moment, the unauthorized carrier wave indicated in UL grant message it is up
Uplink is carried out on transfer resource.
In one embodiment, base station sends UL grant message in n-th subframe；User
Terminal is on the designated symbols position of the n-th+3 subframes, and what UL grant message was indicated is non-
Carrier wave is authorized to carry out clear channel assessment (CCA)；The specified moment is the first of the n-th+4 subframes
Individual symbol.
In one embodiment, user terminal is received after UL grant message, in UL grant
The step of carrying out clear channel assessment (CCA) on the unauthorized carrier wave that message is indicated includes：Receiving UL
After grant message, in same subframe each user terminal in the same cells of uplink scheduling is carried out
The unauthorized carrier wave that UL grant message is indicated is carried out based on the idle channel of contention window simultaneously
Assessment；If first user terminal determines that the unauthorized carrier channel that UL grant message is indicated is empty
Spare time is available, then with busy channel, other are used the up preserved signal RS for sending this cell-specific
Family terminal stops carrying out clear channel assessment (CCA) after the RS for detecting this cell-specific.So,
Same subframe scheduling, first terminal sends RS when judging that channel idle is available, so as to other
Terminal stops assessment.
In one embodiment, user terminal is received after UL grant message, in UL grant
The step of carrying out clear channel assessment (CCA) on the unauthorized carrier wave that message is indicated includes：Receiving UL
After grant message, in same subframe each user terminal in the same cells of uplink scheduling is carried out
The unauthorized carrier wave that UL grant message is indicated is carried out based on the idle channel of contention window simultaneously
Assessment, wherein each user terminal has identical contention window and fallback counter parameter, so as to
The maximum clear channel assessment (CCA) time of each user is identical.The assessment of same subframe scheduling user is same
When complete.
In one embodiment, each user terminal is when clear channel assessment (CCA) fails, if not
To the maximum clear channel assessment (CCA) time, then continue executing with the clear channel assessment (CCA) of extension, so as to after
It is continuous that clear channel assessment (CCA) is carried out to the unauthorized carrier wave that UL grant message is indicated.So, use
Family, if maximum time does not arrive, can proceed with assessment in assessment failure.
In one embodiment, the unauthorized carrier wave that user terminal is indicated in UL grant message
Uplink transmission resource on include the step of carry out uplink：If user terminal takes continuous son
Frame is transmitted, then the unauthorized load not indicated UL grant message between continuous subframes
Ripple carries out clear channel assessment (CCA).When continuous subframes are taken, only using front once being commented
Estimate, be not estimated between continuous subframes, the assessment time can be saved.
The method of lifting LAA upstream performances provided in an embodiment of the present invention, provides one kind
The method of clear channel assessment (CCA) is carried out when carrying out uplink using unauthorized frequency range, and is given
LBT and transmitting uplink data timing relationship, and transmitting uplink data process, can improve
LAA upstream performances, it is possible to lift terminal uplink access probability, reduce this cell end
CCA detections conflict between end, it is ensured that uplink scheduling resource makes full use of, realization with other is
The close friend of system coexists.For hinge structure, based on the change to existing LBT schemes,
LBT sums between the complexity relatively low user for being prevented effectively from same subframe uplink scheduling in realization
Interfere according to transmitting procedure, realize that close friend coexists, lift resource utilization, meet up
The system requirements of MU-MIMO and frequency division multiplexing.
In prior art, if carrying out LBT by base station, due to limited coverage area, Ke Nengwu
Method finds some nodes, and these nodes are referred to as concealed nodes, as shown in Fig. 2 by
ENB1 carries out LBT, can cover UE, but due to limited coverage area, therefore can not
Cover eNB2, WIFI AP, WIFI STA.Therefore, it is up that LBT is carried out by terminal
Testing result is the most reliable, in addition European Regulation Policy regulation, and each sending node is awarded non-
Power carrier wave transmitting must carry out LBT, therefore the scheme for carrying out LBT by base station can not in Europe
OK.
In prior art, UL LBT are in the following ways：Cat1：DL LBT are in base station,
UL Grant are sent to UE, base station can be accounted for by Reserved signal to channel
With UE directly carries out uplink in corresponding subframe, is not LBT, and this method is simple
But European regulatory policy is not allowed；Cat2：Terminal completes Frame Based LBT, terminal
CCA is carried out in Idle period, channel can be used on Channel Occupancy if finding
Time carries out data transmission；If detection channel is unavailable, in Channel Occupancy
Time is not transmitted, and waits next detection cycle.This mode frame timing is fixed, eventually
End detection is synchronous, relatively easy, but access probability is low, if while CCA results are channel
It is busy, data are not passed in whole Fixed Frame Period, cause channel utilization low；
Cat3&Cat4：Terminal completes Load Based LBT, can fix contention window or can
Become contention window, when terminal finds that channel is available, data is activation is carried out immediately, though this mode
So can flexibly be changed according to system load, but frame length is not fixed, and terminal access probability is high, phase
To complexity.
LAA upcoming base station United Dispatching terminals are carried out after LBT, after assessment channel is available
Carry out uplink.Because there is base station scheduling user, but channel is found not after user's assessment
Can use, it is impossible to carry out the situation of uplink, it is therefore necessary to upstream data is needed to fix
Timing sends, in case base station does not know whether terminal has carried out uplink.In prior art
Cat3＆4LBT schemes find to be transmitted immediately after channel idle, due to ECCA competition windows
Different with backoff counter, up delivery time is not fixed, and window and counter are little
User carries out uplink after bid upstate at first, influences whether the identical son of this cell
The ECCA processes of the other users of frame scheduling.Specifically, a certain user first judges channel
Transmitting uplink data can be immediately carried out with after, when other users can be caused to carry out ECCA, be sentenced
Channel is determined unavailable, so as to waste unauthorized frequency range this moment available resources.
Terminal utilizes unauthorized frequency in a kind of network architecture of LAA that the embodiment of the present invention is proposed
Spectrum carry out uplink, the method that up idle channel is estimated, and be given LBT with
Transmitting uplink data timing relationship, and transmitting uplink data process, lift terminal uplink and access
While probability, CCA detections conflict between this cell terminal is reduced, it is ensured that uplink scheduling resource
Make full use of, realize that close friend coexists.In order to realize coexisting with the close friend of other systems, entering
Before row transmitting uplink data, need to detect channel status, that is, perform CCA mistakes
Journey, prevents from producing it interference in other systems busy channel.Method proposed by the present invention is
Terminal carries out CCA, and when terminal is detected when channel is idle condition uplink is just carried out.
Specifically process is：The terminal for carrying out uplink is needed to authorize carrier wave to send scheduling to base station
Request (SR) and buffer status information (BSR), base station is carrying out unauthorized carrier wave selection
Afterwards, can authorize frequency range to be unauthorized frequency range to needs in the descending carrier of base station
The terminal for carrying out uplink sends uplink scheduling authorization (UL grant), afterwards corresponding
Time terminal carries out CCA, if the result of detection is channel idle, carries out in the stipulated time
Transmitting uplink data, does not otherwise carry out data transmission.
Three key issues are related generally in said process, i.e.,：Idle channel detection method,
LBT and uplink sequential relationship, transmitting uplink data process.For the problems referred to above, this
Inventive embodiments provide solution below：
1st, idle channel detection method：Carried out based on the UL LBT of LBE by terminal.When
When terminal detection channel is available, transmitting uplink data is carried out, otherwise do not carry out upstream data biography
It is defeated.Concrete detection method can be adopted：(1) user of same subframe uplink scheduling enters simultaneously
LBE of the row based on contention window.After a certain user has found that channel is available, send immediately reserved
Signal (reserved signal, RS) busy channel.RS is the related special signal of cell, this
When cell other users recognize this cell reserved signal, CCA is no longer carried out, directly
Being connected on the regulation moment starts transmitting uplink data；(2) the competing of same subframe scheduling user is set
Window is striven identical with fallback counter parameter, parameter setting needs high-level signaling to notify, to ensure to use
Family completes LBT processes simultaneously.Specifically, when ICCA (Initial CCA) detections find letter
Road is taken when cannot transmit, and can start ECCA (Extended CCA), and ECCA includes two
Parameter, competition window (Contention Window) Q and fallback counter (backoff
counter)N.When ECCA is carried out, terminal is based on contention window value, random selection one
The value of individual fallback counter N, N is related to CW settings, and N is less than or equal to more than or equal to 0
q-1.Counter subtracts 1 if channel idle, and until N=0, channel idle carries out line number
According to transmission.If the value that can be seen that for different user Q and N from this process is arranged
Difference, required Channel Detection Time is certainly different.By the reasonable setting to Q and N
User is allowd while completing channel detection process.
2nd, LBT and uplink sequential relationship：Terminal is sent after SR, and base station is descending
Carrier wave (can be mandate or unauthorized carrier wave) subframe #n sends UL Grant, and terminal is in subframe
Last 1～2 symbol (depending on contention window size) of #n+3 carries out CCA, in subframe
First sign-on transmitting uplink data of #n+4.
3rd, transmitting uplink data：If terminal takes continuous subframes transmission, only transmit in first time
Before be LBT；If continuous subframes resource allocation is to different user, previous sub-frame data transmission is needed
It is empty (can indicate in UL grant) to reserve last 1～2 symbol, in order to avoid under interference
One subframe scheduling user's UL LBT processes.
Fig. 3 illustrates the terminal of one embodiment of the invention and base station schematic diagram of a scenario, such as Fig. 3
The shown scene includes UE1, UE2, UE3 and eNodeB.In order to embody technical scheme
Main contents, by scene simplification for only comprising terminal and base station, terminal UE 1, UE2,
UE3 is the terminal for needing to be carried out using unlicensed spectrum uplink, positioned at base station eNodeB
Coverage within, eNodeB is entered by downstream grants frequency spectrum to UE1, UE2, UE3
Row scheduling,
Fig. 4 illustrates one embodiment of the invention LBT and transmitting uplink data time diagram,
As shown in Figure 4：
Step 401, in subframe #n：ENodeB to UE1 and UE2 sends UL grant.
Step 402, in subframe #n+1：ENodeB to UE1 and UE3 sends UL
grant。
Step 403, enters simultaneously in last 1～2 symbol UE1 and UE2 of subframe #n+3
Row CCA, detects channel status.Wherein, last 1～2 symbol of subframe #n+3 is for substantially
Position, can set according to contention window and Backoff timer and change.
Channel Detection can have two schemes：A) UE2 has found that channel can through initial CCA
With, the reservation signal busy channels of cell-specific are sent at once, UE1 is initial
CCA fails, and carries out ECCA, after finding the reservation signal of this cell-specific,
Judge that channel can use, stop Channel Detection；B) system is competing to UE1 and UE2 settings identical
Window and fallback counter, such as q=4, N=3 are striven, such UE1 and UE2 completes the institute of CCA
The maximum time for needing is identical.Fig. 5 illustrates one embodiment of the invention using fixed contention window and returns
Counter data transmission time sequence schematic diagram is moved back, as shown in figure 5, UE1 is after first time CCA
Judge that channel can use, but because up delivery time is not arrived, can not still carry out data is activation；
UE2 fails after first time CCA, proceeds ECCA processes, through three times
ECCA has found that channel can use.
Step 404, in first OFDM symbol of subframe #n+4, on UE1, UE2 start
Row transmission.Wherein UE2 only takes up a sub-frame of uplink, and this is unauthorized for next subframe #n+5
Carrier wave will distribute to UE3 uplink, therefore in last OFDM of subframe #n+4
Symbol, UE2 stops transmission data.UE1 non-is awarded because this will be held in subframe #n+5
Power frequency range, without the need for carrying out LBT, therefore in last or two OFDM of subframe #n+4
Symbol keeps data transfer.
Step 405, in last 1 OFDM symbol of subframe #n+4, UE3 starts up
CCA, has found to send RS busy channels after channel is available；
Step 406, in first OFDM symbol of subframe #n+5, on UE1, UE3 start
Row transmission.
What Fig. 6 illustrated a kind of lifting LAA upstream performances of one embodiment of the invention is
System, as shown in fig. 6, the system includes：User terminal 601, for carrying out uplink
When, send uplink scheduling request and buffer status report to base station；Receiving base station 602
After the UL grant message sent, is carried out to the unauthorized carrier wave that UL grant message is indicated the free time
Channel estimating；If the unauthorized carrier channel that UL grant message is indicated is idle available,
Specified moment, the uplink transmission resource of the unauthorized carrier wave indicated in UL grant message is enterprising
Row uplink；Base station 602, for the buffer status report sent according to user terminal 601
Announcement, current all carrier load situations and unauthorized carrier-in-interference situation, select corresponding non-
Carrier wave is authorized, and uplink scheduling authorization UL grant message, UL are sent to user terminal 601
The unauthorized carrier indication information used comprising the uplink of user terminal 601 in grant message
Distribute information with uplink transmission resource.
In one embodiment, base station 602 specifically sends UL grant and disappears in n-th subframe
Breath；User terminal 601 specifically on the designated symbols position of the n-th+3 subframes, to UL
The unauthorized carrier wave that grant message is indicated carries out clear channel assessment (CCA)；The wherein described specified moment
For first symbol of the n-th+4 subframes.
In one embodiment, after UL grant message is received, on same subframe is carried out
What each user terminal 601 was indicated UL grant message in the same cells of row scheduling non-awards
Power carrier wave is carried out based on the clear channel assessment (CCA) of contention window simultaneously；Wherein first user terminal 601
When it is determined that the unauthorized carrier channel free time that UL grant message is indicated can use, up transmission
With busy channel, other user terminals 601 are being detected the preserved signal RS of this cell-specific
Stop carrying out clear channel assessment (CCA) after the RS of this cell-specific.
In one embodiment, after UL grant message is received, on same subframe is carried out
What each user terminal 601 was indicated UL grant message in the same cells of row scheduling non-awards
Power carrier wave is carried out based on the clear channel assessment (CCA) of contention window, wherein each user terminal 601 simultaneously
With identical contention window and fallback counter parameter, so as to the maximum idle channel of each user
The assessment time is identical.
In one embodiment, each user terminal 601 is additionally operable to be lost in clear channel assessment (CCA)
When losing, if not arriving the maximum clear channel assessment (CCA) time, the idle channel for continuing executing with extension is commented
Estimate, to continue that the unauthorized carrier wave that UL grant message is indicated is carried out idle channel and comments
Estimate.
In one embodiment, user terminal 601 is additionally operable to be passed in occupancy continuous subframes
When defeated, between continuous subframes not to UL grant message indicate unauthorized carrier wave carry out sky
Channel assessment.
The network architecture system of LAA provided in an embodiment of the present invention, terminal utilizes unlicensed spectrum
Uplink is carried out, and provides LBT and transmitting uplink data timing relationship, and upstream data
Transmitting procedure, the method for up clear channel assessment (CCA), while lifting terminal uplink access probability,
Reduce CCA detections conflict between this cell terminal, it is ensured that making full use of for uplink scheduling resource, it is real
Existing close friend coexists.
Description of the invention is given for the sake of example and description, and is not exhaustively
Or the form disclosed in limiting the invention to.Many modifications and variations are for the common skill of this area
It is obvious for art personnel.It is to more preferably illustrate the principle of the present invention to select and describe embodiment
And practical application, and one of ordinary skill in the art is made it will be appreciated that the present invention is suitable so as to design
In the various embodiments with various modifications of special-purpose.
Claims (12)
1. a kind of method of lifting LAA upstream performances, it is characterised in that include：
User terminal sends uplink scheduling request and delays when uplink is carried out to base station
Deposit state report；
Buffer status report, current all carrier load feelings that base station sends according to user terminal
Condition and unauthorized carrier-in-interference situation, select corresponding unauthorized carrier wave, and to user terminal
Uplink scheduling authorization UL grant message is sent, comprising on user terminal in UL grant message
Unauthorized carrier indication information and uplink transmission resource distribution information that row transmission is used；
User terminal is received after UL grant message, non-the awarding to the instruction of UL grant message
Power carrier wave carries out clear channel assessment (CCA)；
If the unauthorized carrier channel that UL grant message is indicated is idle available, user terminal
At the specified moment, in the uplink transmission resource of the unauthorized carrier wave indicated in UL grant message
Carry out uplink.
2. method according to claim 1, it is characterised in that
The step of base station sends uplink scheduling authorization UL grant message to user terminal includes：
Base station sends UL grant message in n-th subframe；
User terminal carries out clear channel assessment (CCA) to the unauthorized carrier wave that UL grant message is indicated
The step of include：
User terminal on the designated symbols position of the n-th+3 subframes, to UL grant message
The unauthorized carrier wave for indicating carries out clear channel assessment (CCA)；
The specified moment is first symbol of the n-th+4 subframes.
3. method according to claim 2, it is characterised in that
User terminal is received after UL grant message, in non-the awarding of UL grant message instruction
The step of carrying out clear channel assessment (CCA) on power carrier wave includes：
After UL grant message is received, in same subframe the same cells of uplink scheduling are carried out
The unauthorized carrier wave that interior each user terminal is indicated UL grant message is carried out based on competing simultaneously
Strive the clear channel assessment (CCA) of window；
If first user terminal determines that the unauthorized carrier channel that UL grant message is indicated is idle
Can use, then it is up send this cell-specific preserved signal RS with busy channel, other users
Terminal stops carrying out clear channel assessment (CCA) after the RS for detecting this cell-specific.
4. method according to claim 2, it is characterised in that
User terminal is received after UL grant message, in non-the awarding of UL grant message instruction
The step of carrying out clear channel assessment (CCA) on power carrier wave includes：
After UL grant message is received, in same subframe the same cells of uplink scheduling are carried out
The unauthorized carrier wave that interior each user terminal is indicated UL grant message is carried out based on competing simultaneously
The clear channel assessment (CCA) of window is striven, wherein each user terminal has identical contention window and rollback meter
Number device parameters, so as to the maximum clear channel assessment (CCA) time of each user it is identical.
5. the method according to claim 3 or 4, it is characterised in that
Each user terminal is when clear channel assessment (CCA) fails, if do not arrive maximum idle channel commenting
Estimate the time, then continue executing with the clear channel assessment (CCA) of extension, to continue that UL grant are disappeared
The unauthorized carrier wave that breath is indicated carries out clear channel assessment (CCA).
6. the method according to any one of claim 1-4, it is characterised in that
In the uplink transmission resource of the unauthorized carrier wave that user terminal is indicated in UL grant message
The step of carrying out uplink includes：
If user terminal takes continuous subframes and is transmitted, not to UL between continuous subframes
The unauthorized carrier wave that grant message is indicated carries out clear channel assessment (CCA).
7. a kind of system of lifting LAA upstream performances, it is characterised in that include：
User terminal, for when uplink is carried out, to base station uplink scheduling request being sent
And buffer status report；After the UL grant message for receiving base station transmission, to UL
The unauthorized carrier wave that grant message is indicated carries out clear channel assessment (CCA)；If UL grant message refers to
The unauthorized carrier channel shown is idle available, then at the specified moment, refer in UL grant message
Uplink is carried out in the uplink transmission resource of the unauthorized carrier wave for showing；
Base station, for the buffer status report, the current all carrier waves that are sent according to user terminal
Loading condition and unauthorized carrier-in-interference situation, select corresponding unauthorized carrier wave, and to
Family terminal sends uplink scheduling authorization UL grant message, and user is included in UL grant message
Unauthorized carrier indication information and uplink transmission resource distribution information that terminal uplink transmission is used.
8. system according to claim 7, it is characterised in that
Base station specifically sends UL grant message in n-th subframe；
User terminal specifically on the designated symbols position of the n-th+3 subframes, to UL grant
The unauthorized carrier wave that message is indicated carries out clear channel assessment (CCA)；
The wherein described specified moment is first symbol of the n-th+4 subframes.
9. system according to claim 8, it is characterised in that
After UL grant message is received, in same subframe the same cells of uplink scheduling are carried out
The unauthorized carrier wave that interior each user terminal is indicated UL grant message is carried out based on competing simultaneously
Strive the clear channel assessment (CCA) of window；Wherein first user terminal is it is determined that UL grant message is indicated
Unauthorized carrier channel it is idle available when, the preserved signal RS of up this cell-specific of transmission
With busy channel, other user terminals stop carrying out sky after the RS for detecting this cell-specific
Channel assessment.
10. system according to claim 8, it is characterised in that
After UL grant message is received, in same subframe the same cells of uplink scheduling are carried out
The unauthorized carrier wave that interior each user terminal is indicated UL grant message is carried out based on competing simultaneously
The clear channel assessment (CCA) of window is striven, wherein each user terminal has identical contention window and rollback meter
Number device parameters, so as to the maximum clear channel assessment (CCA) time of each user it is identical.
11. systems according to claim 9 or 10, it is characterised in that
Each user terminal is additionally operable to when clear channel assessment (CCA) fails, if not arriving the maximum free time
Channel assessment time, then continue executing with the clear channel assessment (CCA) of extension, to continue to UL
The unauthorized carrier wave that grant message is indicated carries out clear channel assessment (CCA).
12. systems according to any one of claim 7-10, it is characterised in that
User terminal is additionally operable to when occupancy continuous subframes are transmitted, between continuous subframes
Clear channel assessment (CCA) is not carried out to the unauthorized carrier wave that UL grant message is indicated.
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