CN106332297A - Wireless communication method - Google Patents
Wireless communication method Download PDFInfo
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- CN106332297A CN106332297A CN201510367197.7A CN201510367197A CN106332297A CN 106332297 A CN106332297 A CN 106332297A CN 201510367197 A CN201510367197 A CN 201510367197A CN 106332297 A CN106332297 A CN 106332297A
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- Prior art keywords
- base station
- community
- message
- leading symbol
- symbol
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides a wireless communication method, and specifically relates to a downlink transmission method on a slave cell in a base station of a LTE communication system, wherein the slave cell is an unauthorized carrier. The method comprises the following steps: the base station determines at least one OFDM symbol position in a downlink sub-frame of the slave cell as a position of sending a preamble symbol; the base station carries out idle channel detection on the slave cell to determine whether the slave cell is idle; and when the slave cell is determined to be idle, the base station sends the preamble symbol at the next position of sending the preamble symbol starting from the moment of completing the idle channel detection.
Description
Technical field
The present invention relates to communication technical field, particularly relate to wireless communication technology field.
Background technology
At wireless communication field, it is however generally that, traditional deployment way is that system is operated in and awards
Power frequency range (licensed band), the most whole frequency spectrum resource all keeps for this system to use.
Typically, LTE communication system uses and authorizes band operation.
But, along with the further growth of wireless traffic, capacity and the frequency to wireless communication system
Duan Yaoqiu improves the most therewith.In this case, the mandate resource of frequency range of LTE system seems
Relative deficiency is got up.Therefore, one of nearest in LTE field study hotspot is how profit
Data service occurred frequently is shunted by the resource of unauthorized frequency range.This kind of scheme is referred to as portion
The LTE (LTE in Unlicensed spectrum is called for short LTE-U) belonging to unauthorized carrier wave is
System
Such as under one typical scene, LTE system uses the frequency range of WiFi system.I.e. LTE
The situation that the community of system and the community of WiFi system at least partly coexist on geographical position.
In this case, if LTE system can use WiFi in the moment of some high capacity
Frequency range carry out service distributing, it is clear that can be greatly improved the performance of system, thus effectively
Reply high capacity application scenarios.
It is clear that in the case of LTE coexists with WiFi system, utilize LTE system
The carrier wave that authorizes to assist the unauthorized carrier wave of WiFi system to carry out access be that one is the most direct
Selection, accordingly, with respect to authorize auxiliary access (Licensed-Assisted Access be called for short
LAA) a big focus of recent moving communicating field has been become.
The existing procedure utilizing LAA technology can farthest continue to use LTE system realizes
Authorize carrier aggregation (Carrier Aggregation the is called for short CA) tune of carrier wave and unauthorized carrier wave
Degree.But for the system compatible with unauthorized carrier wave, it is desired nonetheless to introduce some new mechanism,
One of them matter of utmost importance is how to realize sending out of unauthorized carrier wave in LTE-LAA system
(listen before talk is called for short LBT) is intercepted before sending.
Such as typical, certain unauthorized carrier wave as LTE system from community (Secondary
Cell is called for short Scell) with as main plot (Primary Cell is called for short Pcell) certain mandate
Carrier aggregation.Then before this Pcell attempts to activate this Scell, base station must determine this Scell
Do not taken by other system.Therefore base station needs to detect (Clear at Scell enterprising line space idle channel
Channel Assessment is called for short CCA) to determine that channel is idle, then perform activation
The operation of this Scell.But, when using based on load (Load Base Equipment
Be called for short LBT) pattern time, Pcell only when have load need send time, just can go to attempt to swash
Live Scell, say, that when base station carries out CCA is uncertain, and now Scell
Be whether the free time be also that base station cannot determine in advance.I.e. owing to this base station operation is in LBE mould
Under formula, so only feeling the need to use this unauthorized carrier wave to enter as Scell when this base station
In the moment of row transmission, this base station just can carry out CCA or ECCA on this unauthorized carrier wave
(Extended CCA) operates, and to confirm in this moment, this unauthorized carrier wave is the most empty
Not busy available.However, it is contemplated that CCA/ECCA operates the time extremely short (shortest time taken
About 20 microseconds), much smaller than the time of a LTE subframe.Therefore, the CCA/ECCA of base station
Operation can be to occur in the middle of a subframe of Scell, though it means that base station
Confirming that this Scell is idle at present sub-frame, intactly data transmission also can only be at the next one
Subframe sends.And present sub-frame does not also terminate, so base station must make to take by some way
The remainder of present sub-frame, otherwise in the remaining time of present sub-frame, if there being other
If system also performs CCA/ECCA operation, also can judge that this Scell is idle available,
Conflict certainly will be caused in next subframe.Unauthorized load is taken at present sub-frame in order to solve base station
The problem of ripple, has been proposed in the industry a kind of scheme: base station after confirming that Scell can use,
Targeting signal is sent, so that other equipment are carried out subsequently in the remaining time of present sub-frame
This carrier wave can be perceived during CCA/ECCA operation to be taken by certain system.And carry further
Going out, this targeting signal can be additionally used in receiving terminal and adjusts automatic growth control (automatic gain
Control is called for short AGC), or be used for notifying UE, this Scell is activated.For this
Purpose, UE can on Scell this targeting signal of blind decoding.
But, such scheme still can not fully solve problem.Firstly, since UE does not knows base
Standing and when can send this leading symbol, therefore the omnidistance trial on Scell of inevitable requirement UE is blind
Decode this leading symbol.This necessarily causes the power consumption of UE to be significantly greatly increased, and is unfavorable for UE's
Duration performance.Additionally, the most apparently, the quantity of information of the actual transmission of this leading symbol is the most little,
Yet with needing the reason of band occupancy, in such scheme, from completing CCA/ECCA's
Moment started until the start time of next subframe, and base station is required for persistently sending leading character
Number take frequency range, it is assumed that be to complete CCA/ECCA in this moment started of a subframe,
Then need to take and just can start to transmit data after a whole subframe.Obviously, so
The waste of the Radio Resource of preciousness can be caused, also cannot be as preferable solution.
So the target of the present invention is exactly to find the downlink transmission method of a kind of new Scell；This
The method of kind is required to so that UE is without persistently receiving leading symbol；Make again base station without
Persistently send leading symbol until next subframe.
Summary of the invention
For solving the problems referred to above of the prior art, the present invention proposes under a kind of new Scell
Row transmission method.By allowing base station determine at specific position transmission leading symbol, thus really
Protect UE can only attempt in corresponding position receiving this leading symbol.
Specifically, according to the first aspect of the invention, it is proposed that a kind of in LTE communication system
Zhong Cong community, base station on carry out the method for downlink transfer, wherein, described is non-from community
Authorizing carrier wave, described method includes: described base station determines described from the descending sub frame of community
At least one OFDM symbol position be send leading symbol position；Described base station is in institute
The enterprising line space idle channel detection of Shu Cong community, determines described the most idle from community；When determining
Described from cell null idle, described base station was opened from the moment completing the detection of described idle channel
The position of the next one described transmission leading symbol begun sends described leading symbol.
Preferably, wherein, the most also including, described base station will by the first message
The position of described transmission leading symbol is sent to subscriber equipment.
It is highly preferred that described first message is broadcast.
It is highly preferred that described first message is radio resource control information.
It is highly preferred that described first message is layer 1 message.
It is highly preferred that described base station sends described first message on main plot.
It is highly preferred that described base station is sending described first message on community.
Preferably, also include after the 3rd step: described base station is sending described leading character
Downlink data is sent after number..
Preferably, the 3rd step also includes: described base station is from completing the detection of described idle channel
Moment start to send descending preserved signal until the described next one described transmission leading symbol
Position.
According to the second aspect of the invention, it is proposed that a kind of user in LTE communication system sets
The method receiving downlink transfer on standby Zhong Cong community, wherein, described is unauthorized from community
Carrier wave, described method includes: described subscriber equipment described from the descending sub frame of community
At least one OFDM symbol position is attempted receiving the serving BS of described subscriber equipment and is sent
Leading symbol.
Preferably, also include in above-mentioned steps, receive the first of described serving BS transmission and disappear
Breath, wherein, described first message is for notifying that described serving BS sends leading symbol extremely
A few OFDM symbol position.
It is highly preferred that described first message is broadcast.
It is highly preferred that described first message is radio resource control information.
It is highly preferred that described first message is layer 1 message.
It is highly preferred that described base station sends described first message on main plot.
It is highly preferred that described base station is sending described first message on community.
Preferably, the most also including, described subscriber equipment is being properly received
After stating leading symbol, described from community reception downlink data.
According to the third aspect of the invention we, it is proposed that a kind of in the base station of LTE communication system
Carrying out the equipment of downlink transfer on community, wherein, described is unauthorized carrier wave from community,
Described equipment comprises determining that module, determines described from the descending son of community for described base station
At least one OFDM symbol position in frame is the position sending leading symbol；Detection module,
For described base station in the described enterprising line space idle channel detection from community, determine described from community
The most idle；Sending module, for described from cell null idle when determining, described base station exists
From the next one described transmission leading symbol that starts of moment completing described idle channel detection
Position sends described leading symbol.
According to the fourth aspect of the invention, it is proposed that a kind of user in LTE communication system sets
Receiving the equipment of downlink transfer on standby Zhong Cong community, wherein, described is unauthorized from community
Carrier wave, described equipment includes: receiver module, for described subscriber equipment described from community
Descending sub frame at least one OFDM symbol position attempt receiving described subscriber equipment
The leading symbol that serving BS is sent.
In the present invention, the scheme fixing by the position of leading symbol will be sent so that UE
Leading symbol need to be received, it is to avoid trial lasting for UE receives, thus subtracts in fixing position
Lack the power consumption of UE；By allowing base station determine the scheme of the position sending leading symbol, real
Show the purpose of flexible configuration；By allowing base station carry out data after having sent leading symbol
The scheme sent, improves the utilization rate of frequency band.It is achieved thereby that the purpose of the present invention.
Accompanying drawing explanation
The following detailed description to non-limiting example is read by referring to accompanying drawing, this
Further feature, purpose and the advantage of invention will will become more apparent.
Fig. 1 show according to the present invention a kind of in the base station of LTE communication system from little
The flow chart of the method for downlink transfer is carried out in district；
Fig. 2 show according to the present invention a kind of in the subscriber equipment of LTE communication system
The flow chart of the method for downlink transfer is received from community；
Fig. 3 show according to the present invention a kind of in the base station of LTE communication system from little
The block diagram of the equipment of downlink transfer is carried out in district；
Fig. 4 show according to the present invention a kind of in the subscriber equipment of LTE communication system
The block diagram of the equipment of downlink transfer is received from community.
Wherein, same or analogous reference represents same or analogous steps characteristic or dress
Put/module.
Detailed description of the invention
In the specific descriptions of following preferred embodiment, will be with reference to constituting a present invention part
Appended accompanying drawing.Appended accompanying drawing has been illustrated by way of example and has been capable of the present invention
Specific embodiment.The embodiment of example is not intended as the limit all realities according to the present invention
Execute example.It is appreciated that without departing from the scope of the present invention, it is possible to use other
Embodiment, it is also possible to carry out the structural or amendment of logicality.Therefore, following concrete
Describe and nonrestrictive, and the scope of the present invention is defined by the claims appended hereto.
First, application according to the present invention scene, have what a LTE communication system covered
Region, including at least one base station and UE and contact mandate carrier wave between the two, i.e.
Pcell.There is also other unauthorized carrier wave in this this region external, can be this base station or
Other communication system of person is used, i.e. Scell.
When base station determines to need to carry out data transmission on this Scell, it is necessary first to non-at this
Authorize and carry out CCA/ECCA operation on carrier wave, determine that channel is the most idle, work as channel idle
Time, base station needs to send leading symbol, and its effect is: one, is used for taking this channel and avoids
Other communication systems use；Two, it is used for notifying that this channel of UE is the most occupied, will be at this
Data are sent on Scell.Clearly as under LBE scene, base station can be at any time
Determine to use Scell, therefore UE must be ready to receive the leading symbol that base station sends, i.e.
The trial that UE has to last for receives this leading symbol, thus adds the power consumption of UE.
Therefore the present invention is based on such scheme, it is further proposed that, can be by base station at this Scell
In all OFDM symbol of descending sub frame, some of which OFDM symbol is determined in advance and uses
Leading symbol only can be just sent in the position of these symbols in sending this leading symbol, i.e. base station,
Accordingly, UE has only to attempt receiving leading symbol in the position of these symbols, thus
It is received trial without lasting.Therefore the power consumption of UE is decreased.
For example, a descending sub frame of Scell includes 14 OFDM symbol, right
The position answered with (0,1,2 ... 13) represent.Then base station may determine that in (6,13)
Position on send leading symbol, i.e. base station be only possible to (6,13) the two position send
Leading symbol, therefore UE side only need to attempt connecing in the corresponding the two position of each subframe
It is subject to, and is no need in other 12 positions attempting.And select which OFDM symbol position
Sending leading symbol can be with flexible configuration, as long as determining at least one of descending sub frame
Send on position, such as, for above-mentioned example, base station determines only to be sent out on 1 position
Send or all send on whole 14 positions and also can realize the purpose of the present invention.Therefore may be used
Carry out the demand of flexible configuration meeting base station.Further, base station can also be changed the most true
Fixed transmission position, to adapt to different business and channel situation.
On this basis, according to one embodiment of present invention, it is proposed that a kind of logical at LTE
The method carrying out downlink transfer in the base station of communication system on Scell.Concrete:
First in the descending sub frame of Scell, the position of at least one OFDM symbol is determined by base station
Putting, only these positions can be used for sending leading symbol；
Second step, this base station carries out CCA/ECCA operation on this Scell, determines Scell
The most idle；
3rd step, if result is this Scell free time, then base station can complete previous step
The next one that the moment of CCA/ECCA operation rises can send the position transmission of leading symbol should
Leading symbol.
For example, first base station determines at (6,13) position transmission leading symbol；Second
Step base station carries out CCA/ECCA operation on Scell and determines the Scell free time, should
The moment that CCA/ECCA has operated is corresponding to the 0th character position of descending sub frame；The
Three step base stations can send leading symbol at the 6th character position.In like manner, if in second step
The moment that CCA/ECCA has operated corresponds to the 8th character position of descending sub frame, then
3rd step base station can send leading symbol at the 13rd character position.
As preferably, base station can be by the after determining the position sending leading symbol
One message will send the location information notification UE of leading symbol.This first message can be broadcast
Message or wireless heterogeneous networks (radio resource controll is called for short RRC) message or
Layer 1 (layer 1) message.This first message both can be sent by Scell, it is also possible to is
Sent by Pcell.
Additionally, after above-mentioned third step, after base station can also send leading symbol
Immediately begin to send downlink data, and without waiting until the beginning of next subframe, the most permissible
Improve band efficiency.Because after UE receives leading symbol, with regard to already known base station
Having occupied this Scell, will send data, therefore UE side has been ready for reception data
Preparation, it is not necessary to wait until next subframe.Such as in previous example, base station is at the 6th symbol
After number position has sent leading symbol, it is possible to and then start to send downlink data.
Further, in above-mentioned third step, base station has operated at CCA/ECCA
Moment can send descending reserved letter between the moment that the next one can send leading symbol
Number, the effect of this descending preserved signal is to take this Scell, prevents other system in this section
Attempt in time taking this Scell.Such as in previous example, base station is from completing CCA/ECCA
0th character position of operation starts to send descending preserved signal, until the 6th symbol is opened
Till the position begun.
Accompanying drawing 1 shows the flow chart carrying out downlink transfer according to above-described embodiment, including:
The most described base station determines described at least one OFDM from the descending sub frame of community
Character position is the position sending leading symbol；
The most described base station in the described enterprising line space idle channel detection from community, determine described from
Community is the most idle；
S13. described from cell null idle when determining, described base station is from completing described idle letter
The position of the next one described transmission leading symbol that the moment of road detection starts sends described leading
Symbol.
Corresponding, according to another embodiment of the invention, it is proposed that a kind of logical at LTE
The method receiving downlink transfer in the UE of communication system on Scell.Concrete:
This UE attempts at least one the OFDM symbol position in the descending sub frame of this Scell
Receive the leading symbol that the serving BS of this UE is sent.
Further, also including that this UE receives the first message that this base station sends, this first disappears
Breath is used for notifying this UE, and this serving BS will send leading symbol on which position.This is years old
One message can be broadcast or wireless heterogeneous networks (radio resource controll letter
Claim RRC) message or layer l (layer 1) message.This first message both can pass through Scell
Send, it is also possible to be to be sent by Pcell.
Preferably, this UE is after being properly received described leading symbol, immediately on this Scell
Receive downlink data and without waiting until next subframe.
Accompanying drawing 2 shows the flow chart receiving downlink transfer according to above-described embodiment, including:
The most described subscriber equipment is at least one from the descending sub frame of community described
OFDM symbol position attempts receiving the leading character that the serving BS of described subscriber equipment is sent
Number.
Hereinafter combine accompanying drawing again and introduce set corresponding with said method provided by the present invention
Standby, in view of unit/device characteristic therein has corresponding relation with the steps characteristic in said method,
To conform to the principle of simplicity.
Accompanying drawing 3 show according to the present invention a kind of in the base station of LTE communication system
Carrying out the equipment 30 of downlink transfer on Scell, described equipment includes:
Determine module 3001, determine for described base station described from the descending sub frame of community
At least one OFDM symbol position is the position sending leading symbol；
Detection module 3002, for described base station in the described enterprising line space idle channel inspection from community
Survey, determine described the most idle from community；
Sending module 3003, for described from cell null idle when determine, described base station from
Complete the position of the next one described transmission leading symbol that the moment of described idle channel detection starts
Put the described leading symbol of transmission.
Accompanying drawing 4 show according to the present invention a kind of in the UE of LTE communication system at Scell
The equipment 40 of upper reception downlink transfer, described equipment includes:
Receiver module 4001, for described subscriber equipment described from the descending sub frame of community
At least one OFDM symbol position attempt receive described subscriber equipment serving BS sent out
The leading symbol sent.
Above embodiments of the invention are described, but the invention is not limited in spy
Fixed system, equipment and concrete agreement, those skilled in that art can want in appended right
Various deformation or amendment is made in the range of asking.
The those skilled in the art of those the art can be by research description, disclosed
Content and accompanying drawing and appending claims, understand and implement the embodiment disclosed
Other change.In the claims, word " includes " element and the step being not excluded for other,
And wording " one " is not excluded for plural number.In the present invention, " first ", " second "
Only represent title, do not represent orbution.In the actual application of invention, a part can
The function of multiple technical characteristics cited in claim can be performed.Appointing in claim
What reference should not be construed as the restriction to scope.
Claims (19)
1. the side carrying out downlink transfer on the Zhong Cong community, base station of LTE communication system
Method, wherein, described is unauthorized carrier wave from community, and described method includes:
The most described base station determines the described symbol of at least one OFDM from the descending sub frame of community
Number position is the position sending leading symbol；
The most described base station, in the described enterprising line space idle channel detection from community, determines described from little
District is the most idle；
C. described from cell null idle when determining, described base station is from completing described idle channel
The position of the next one described transmission leading symbol that the moment of detection starts sends described leading character
Number.
Method the most according to claim 1, wherein, described step a also includes: institute
State base station, by the first message, the position of described transmission leading symbol is sent to subscriber equipment.
Method the most according to claim 2, wherein, described first message is that broadcast disappears
Breath.
Method the most according to claim 2, wherein, described first message is wireless money
Source controls message.
Method the most according to claim 2, wherein, described first message is that layer 1 disappears
Breath.
Method the most according to claim 2, wherein, described base station is sent out on main plot
Send described first message.
Method the most according to claim 2, wherein, described base station described from community
Described first message of upper transmission.
Method the most according to claim 1, wherein, also wraps after described step c
Include,
The most described base station sends downlink data after having sent described leading symbol.
Method the most according to claim 1, wherein, described step c also includes: institute
State base station to start to send descending preserved signal straight from the moment completing the detection of described idle channel
Position to the described next one described transmission leading symbol.
10. one kind receives descending biography on the subscriber equipment Zhong Cong community of LTE communication system
Defeated method, wherein, described is unauthorized carrier wave from community, and described method includes:
The most described subscriber equipment is at the described OFDM of at least one from the descending sub frame of community
Character position is attempted receiving the leading symbol that the serving BS of described subscriber equipment is sent.
11. methods according to claim 10, described step A also includes, receives institute
Stating the first message that serving BS sends, wherein, described first message is used for notifying described clothes
Business base station sends at least one OFDM symbol position of leading symbol.
12. methods according to claim 11, wherein, described first message is broadcast
Message.
13. methods according to claim 11, wherein, described first message is wireless
Resource Control Message.
14. methods according to claim 11, wherein, described first message is layer 1
Message.
15. methods according to claim 11, wherein, described serving BS is main little
Described first message is sent in district.
16. methods according to claim 11, wherein, described serving BS is described
Described first message is sent from community.
17. methods according to claim 10, also include after described step A,
The most described subscriber equipment, after being properly received described leading symbol, connects from community described
Receive downlink data.
18. 1 kinds carry out downlink transfer on the Zhong Cong community, base station of LTE communication system
Equipment, wherein, described is unauthorized carrier wave from community, and described equipment includes:
Determine module, determine for described base station described from the descending sub frame of community at least
One OFDM symbol position is the position sending leading symbol；
Detection module, for described base station in the described enterprising line space idle channel detection from community,
Determine described the most idle from community；
Sending module, for described from cell null idle when determining, described base station is from completing
The position of the next one described transmission leading symbol that the moment of described idle channel detection starts is sent out
Send described leading symbol.
19. 1 kinds receive descending biography on the subscriber equipment Zhong Cong community of LTE communication system
Defeated equipment, wherein, described is unauthorized carrier wave from community, and described equipment includes:
Receiver module, for described subscriber equipment described from the descending sub frame of community to
The serving BS of few OFDM symbol position trial described subscriber equipment of reception is sent
Leading symbol.
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| CN201510367197.7A CN106332297B (en) | 2015-06-29 | 2015-06-29 | Wireless communication method |
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| CN201510367197.7A CN106332297B (en) | 2015-06-29 | 2015-06-29 | Wireless communication method |
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Cited By (1)
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| WO2020020360A1 (en) * | 2018-07-27 | 2020-01-30 | Oppo广东移动通信有限公司 | Wireless communication method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020020360A1 (en) * | 2018-07-27 | 2020-01-30 | Oppo广东移动通信有限公司 | Wireless communication method and device |
| CN112586058A (en) * | 2018-07-27 | 2021-03-30 | Oppo广东移动通信有限公司 | Wireless communication method and apparatus |
| US11627611B2 (en) | 2018-07-27 | 2023-04-11 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Wireless communication method and device for blind detection of downlink signals |
| CN112586058B (en) * | 2018-07-27 | 2023-11-17 | Oppo广东移动通信有限公司 | Wireless communication method and device |
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| Publication number | Publication date |
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| CN106332297B (en) | 2019-12-17 |
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