CN107046732A - Up frame transmission method and device - Google Patents
Up frame transmission method and device Download PDFInfo
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- CN107046732A CN107046732A CN201610084046.5A CN201610084046A CN107046732A CN 107046732 A CN107046732 A CN 107046732A CN 201610084046 A CN201610084046 A CN 201610084046A CN 107046732 A CN107046732 A CN 107046732A
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- Prior art keywords
- srs
- transmission
- ofdm symbol
- reserved
- domain resource
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Classifications
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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
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Abstract
Embodiment of the disclosure discloses a kind of up frame transmission method and device.This method includes：To being reserved close to the specific time-domain resource before the OFDM symbol for transmission channel detection reference signal (SRS)；And clear channel assessment (CCA) (CCA) detection is carried out at reserved time-domain resource.This method can also further comprise：Specific time-domain resource before OFDM symbol for transmitting physical Uplink Shared Channel (PUSCH) data is reserved, and the progress CCA detections at reserved time-domain resource.Embodiment of the disclosure also discloses a kind of corresponding up frame forwarding apparatus.Embodiment of the disclosure proposes the technical scheme for supporting to authorize SRS transmission and PUSCH transmission in frequency spectrum auxiliary access (LAA), improves the reliability and validity of SRS transmission and PUSCH transmission.
Description
Technical field
Embodiment of the disclosure relates generally to wireless communication field, in particular it relates to a kind of
Up frame transmission method and device.
Background technology
In current LTE system, data transfer occurs authorizing frequency spectrum (Licensed
Spectrum on), however as sharply increasing for portfolio, frequency spectrum is authorized to be likely difficult to meet
The demand of portfolio.3GPP has begun working on the LTE deployment in unlicensed spectrum,
Propose mandate frequency spectrum auxiliary access (LAA：License Assisted Access) concept,
The help of frequency spectrum is authorized to use unauthorized frequency range by LTE.Communication on LAA needs should
With carrier sense (LBT：Listen Before Talk) mechanism, that is, using unlicensed spectrum
, it is necessary to first apply clear channel assessment (CCA) (CCA before communication：Clear Channel
Assessment) to intercept whether channel can use, to prevent the communication in unlicensed band from doing
Disturb.
Sounding Reference Signal (SRS in LTE system up-link：Sounding
Reference Signal) transmit for maintaining up timing, and it is easy to eNB according to channel
Estimate and carry out uplink and downlink scheduling using channel reciprocity.Therefore, it is former for identical
Cause, it is desirable to SRS transmission is supported on the unlicensed frequency band for uplink.
Because SRS signal must not necessarily be transmitted together with any uplink physical channel, its is main
There are two kinds of transmission situation, i.e. SRS with Physical Uplink Shared Channel (PUSCH) data in phase
Transmitted with subframe, or SRS is individually transmitted in the subframe without PUSCH transmission.
Need to apply carrier sense mechanism in view of the communication on LAA, and there is presently no support
The solution of above two SRS transmission situation in LAA.
The content of the invention
Based on above mentioned problem, embodiment of the disclosure is specific by being reserved before transmission SRS
Time-domain resource, and consider the support to the LBT processes of PUSCH data transfers, propose
The technical scheme of SRS and PUSCH transmission in LAA is supported, and which thereby enhances SRS
Transmission and the reliability and validity of PUSCH transmission.
According to the one side of the disclosure, there is provided a kind of up frame transmission method, this method
Including：To close to the OFDM symbol for transmission channel detection reference signal (SRS) it
Preceding specific time-domain resource is reserved；And idle letter is carried out at reserved time-domain resource
Assess (CCA) detection in road.
In accordance with an embodiment of the present disclosure, this method also includes：To close to for transmitting physical
Specific time-domain resource before the OFDM symbol of row shared channel (PUSCH) data is reserved
Reserved, and the progress CCA detections at reserved time-domain resource.
In accordance with an embodiment of the present disclosure, this method also includes：Cell-specific SRS is configured,
So that in last OFDM symbol of cell-specific SRS or first OFDM
SRS signal is transmitted on symbol.
In accordance with an embodiment of the present disclosure, this method further comprises：In cell-specific SRS
When transmitting the SRS signal in first OFDM symbol of frame, by cell-specific SRS
The tail portion time-domain resource of the previous subframe of subframe is reserved, for supporting SRS transmission
CCA detection.
In accordance with an embodiment of the present disclosure, this method further comprises：In cell-specific SRS
When transmitting the SRS signal in first OFDM symbol of subframe, by each sub-frame of uplink
Tail portion time-domain resource reserve, for supporting SRS transmission and/or PUSCH transmission
CCA detection.
In accordance with an embodiment of the present disclosure, this method further comprises：In cell-specific SRS
SRS signal is transmitted in first OFDM symbol of subframe and in cell-specific subframe
When transmitting PUSCH data, the PUSCH data are transmitted close to the SRS signal.
In accordance with an embodiment of the present disclosure, this method further comprises：When stating cell-specific SRS
During last OFDM symbol transmission SRS signal of subframe, by rising for each sub-frame of uplink
Initial portion time-domain resource is reserved, while by close to the OFDM symbol for transmitting SRS signal
Part time-domain resource before is reserved, for supporting SRS transmission and/or PUSCH transmission
CCA detection.
In accordance with an embodiment of the present disclosure, this method also includes：Wherein reserved part time domain money
Source includes corresponding to an OFDM symbol on the time or corresponding to more than one
OFDM symbol or corresponding to the time-domain resource less than an OFDM symbol.
In accordance with an embodiment of the present disclosure, this method also includes：Configurating downlink-up switching
Frame so that when only one OFDM symbol is used for up in descending-up switching subframe,
SRS signal is not transmitted in descending-up switching subframe.
In accordance with an embodiment of the present disclosure, this method also includes：Reserved descending-up switching
Last OFDM symbol of frame, it is upper after descending-up switching subframe for supporting
The CCA detections of row sub-frame transmission.
In accordance with an embodiment of the present disclosure, this method also includes：When descending-up switching of use
When thering are two OFDM symbols to be used for up in subframe and descending-up switching subframe,
Last OFDM transmission SRS signal of descending-up switching subframe, and it is reserved it is descending-
The penultimate OFDM symbol of up switching subframe, for supporting SRS transmission
CCA is detected.
According to the second aspect of the disclosure, there is provided a kind of up frame forwarding apparatus, the device bag
Include：Transmission unit, is configured as to close to for transmission channel detection reference signal (SRS)
OFDM symbol before specific time-domain resource reserved；And CCA detection units,
It is configured as carrying out clear channel assessment (CCA) (CCA) detection at reserved time-domain resource.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：To close to for transmitting
Specific time domain money before the OFDM symbol of Physical Uplink Shared Channel (PUSCH) data
Source is reserved, and the progress CCA detections at reserved time-domain resource.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：Configure cell-specific
SRS so that in last OFDM symbol of cell-specific SRS or
SRS signal is transmitted in one OFDM symbol.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：In cell-specific SRS
When transmitting the SRS signal in first OFDM symbol of subframe, by cell-specific SRS
The tail portion time-domain resource of the previous subframe of subframe is reserved, for supporting SRS transmission
CCA detection.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：In cell-specific SRS
When transmitting the SRS signal in first OFDM symbol of subframe, by each sub-frame of uplink
Tail portion time-domain resource reserve, for supporting SRS transmission and/or PUSCH transmission
CCA detection.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：In cell-specific SRS
SRS signal is transmitted in first OFDM symbol of subframe and in cell-specific subframe
When transmitting PUSCH data, the PUSCH data are transmitted close to SRS signal.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：When in cell-specific
During last OFDM symbol transmission SRS signal of SRS, by each sub-frame of uplink
Start-up portion time-domain resource reserve, while by close to the OFDM for transmitting SRS signal
Part time-domain resource before symbol is reserved, for supporting SRS transmission and/or PUSCH
The CCA detections of transmission.
In accordance with an embodiment of the present disclosure, in addition to：Wherein reserved part time-domain resource includes
On time correspond to an OFDM symbol or corresponding to more than one OFDM symbol,
Or corresponding to the time-domain resource less than an OFDM symbol.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：Configurating downlink-up
Switch subframe so that when only one OFDM symbol is used in descending-up switching subframe
During row, SRS signal is not transmitted in descending-up switching subframe.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：It is reserved descending-up
Switch subframe last OFDM symbol, for support it is descending-up switching subframe it
The CCA detections of sub-frame of uplink transmission afterwards.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：When using it is descending-on
There are two OFDM symbols to be used in row switching subframe and descending-up switching subframe up
When, in last OFDM transmission SRS signal of descending-up switching subframe, and in advance
The penultimate OFDM symbol of row-up switching subframe is left, for supporting SRS
The CCA detections of transmission.
Consider the need for transmitting SRS and PUSCH data in LAA, the implementation of the disclosure
Example is realized applies LBT mechanism before being transmitted, improves SRS transmission and PUSCH is passed
Defeated reliability and validity, and and then improve channel measurement and estimation accuracy.
Brief description of the drawings
, will by reference to the detailed description to non-limiting example given by drawings below
More fully understand embodiment of the disclosure, and it is the other purposes of embodiment of the disclosure, thin
Section, feature and advantage will become apparent.In the accompanying drawings：
Fig. 1 is the SRS transmission schematic diagram for showing to perform CCA detections in existing LTE；
Fig. 2 is up frame transmission method schematic flow sheet in accordance with an embodiment of the present disclosure；
Fig. 3 is to transmit schematic diagram according to the uplink frame of one embodiment of the disclosure；
Fig. 4 is to transmit schematic diagram according to the uplink frame of another embodiment of the disclosure；
Fig. 5 is to transmit schematic diagram according to the uplink frame of another embodiment of the disclosure；
Fig. 6 is the situation for showing the different uplink of support in accordance with an embodiment of the present disclosure
Example schematic diagram；And
Fig. 7 is up frame forwarding apparatus schematic diagram in accordance with an embodiment of the present disclosure.
Embodiment
Now it is specifically described with reference to accompanying drawing embodiment of this disclosure.Appended accompanying drawing is only
The specific embodiment of the disclosure can be realized by being only illustrated by way of example, example
Embodiment is not intended as all embodiments of the limit according to the disclosure.Those skilled in the art
Can be on the basis of without departing from embodiment of the disclosure spirit and scope from the description below
Alternative embodiment is obtained, structural or logicality modification is carried out.Therefore, below
Specific descriptions and nonrestrictive, and embodiment of the disclosure scope by appended right
It is required that being limited.Although it should be noted that describing the disclosure in accompanying drawing with particular order
Embodiment in method the step of, but this do not require that or imply must be according to this
Particular order is operated to perform these, or the operation having to carry out shown in whole could be realized
Desired result, on the contrary, step described herein can change execution sequence.It is additional
Multiple steps are merged into a step execution by ground or it is alternatively possible to omit some steps,
And/or a step is decomposed into execution of multiple steps.
In LTE system, generally accorded with last OFDM of cell-specific SRS
Transmission SRS signal on number.Meanwhile, as previously mentioned, SRS is not necessarily to appointing
What uplink physical channel is transmitted together, is allowed in LTE Rel-12 from user equipment (UE)
From the perspective of have two kinds of SRS transmission situations, i.e.,：SRS and PUSCH data are same
Individual sub- frame in transmission, or passed in a sub- frame in individual transmission without PUSCH data
It is defeated.But if SRS and other physical channels (such as PUSCH) are transmitted together, one
The SRS that UE is sent in some specific sub-frame may be with other UE in cell PUSCH
Transmission overlaps each other on frequency domain.Passed in order to avoid different UE SRS transmission and PUSCH
Clashed between defeated, SRS configuration is carried out in cell-level, thus all UE know
Road cell-specific SRS configuration, and it is therefore special in cell without any UE in the cell
PUSCH data are sent in SRS OFDM symbol with being used to transmit in SRS.
Due to requiring to apply LBT mechanism on LAA, for LTE equipment in unauthorized frequency range
Upper monitoring and detection idle channel.LBT mechanism intercepts letter in the clear channel assessment (CCA) CCA times
Road, when detecting the unauthorized frequency range free time, starts to take unauthorized frequency range progress data hair
Send.
Although according to the regulation in EU standards on LBT, SRS can be considered as " short control
Signalling processed ", thus UE can transmit SRS in the case where no LBT is operated.
There is this option, how UE can transmit SRS, SRS transmission machine regardless of channel status
It will can increase.But in this case, channel measurement and estimation be probably it is inaccurate,
Because the interference level between ideal communication channel and busy channel is very different, and actual interference
Level is not estimated, meanwhile, without LBT operations, SRS transmission may be with coming from childhood
The transmission collision of interval or other technologies (such as WIFI), it is also possible to deteriorate suddenly from altogether
The ongoing transmission for the network deposited.Sum it up, LBT must be answered in LAA
For SRS transmission, to improve channel measurement accuracy and avoid possible and other nodes
Conflict.
Fig. 1 shows the schematic diagram that LBT mechanism is directly used in existing LTE communication, i.e.,
LBT processes for SRS transmission are performed with current frame structure.In fig. 1 it is shown that three
Biographies of the individual UE (UE1, UE2, UE3) with different transmission configurations in two subframes
Defeated signal, wherein, the first subframe is cell-specific SRS, and the second subframe is non-SRS
(non-SRS) subframe, meanwhile, UE1 and UE2 are configured or are triggered with the first son
Transmit SRS in frame, and UE1 also transmits PUSCH data in identical subframe, and UE2
There is no PUSCH transmission, it is therefore desirable to which SRS is individually transmitted by their own, and UE3 not by
Configure or be triggered and transmit SRS in the first subframe, it is configured as passing in two subframes
Defeated PUSCH data.In this case, by other nodes such as UE1 and UE3 institutes
There is the PUSCH transmission of progress, UE2 very high chance to detect channel to be busy, thus
CCA detection failures will be caused, it is impossible to transmit SRS signal.
In addition, it is next to protect to have to interruption PUSCH transmission without the SRS UE3 configured
From the SRS transmission of cell interior nodes.In order to restart PUSCH transmission, UE3 should
Channel availability is detected again.However, SRS transmission is hindered in cell by LBT processes
Plug, its CCA testing result is likely to busy, leads to not recover PUSCH transmission.
It is therefore desirable to have new frame structure and transmission means are to support the SRS transmission in LAA.
Embodiment of the disclosure proposes a kind of up frame transmission method, to support to be used for unauthorized carrier wave
The Channel Detection of upper SRS transmission and PUSCH transmission, while remaining in that existing LTE frames
The advantage of structure.
Fig. 2 shows method flow diagram in accordance with an embodiment of the present disclosure.
In step S201, according to one embodiment of the disclosure, to close to for transmitting SRS
Specific time-domain resource before the OFDM symbol of signal is reserved, for supporting SRS
The CCA detections of transmission.In this step, in order to support the SRS transmission to be carried out, pre-
Any signal can not be transmitted in the time-domain resource stayed.
In step S202, clear channel assessment (CCA) (CCA) is carried out at reserved time-domain resource
Detection.In this step, UE can be at reserved time-domain resource using for example " energy is visited
Survey " perform clear channel assessment (CCA) detection, such as the sensing channel at reserved time-domain resource,
If more than one power level threshold of energy level in the channel, then it is assumed that the channel quilt
Take, if it find that the channel idle or being referred to as " clean " (clear), then may be used
To transmit immediately.
According to another embodiment of the disclosure, to close to for transmission channel detection reference letter
Specific time-domain resource before the OFDM symbol of number (SRS) is reserved；And pre-
Clear channel assessment (CCA) (CCA) detection is carried out at the time-domain resource stayed.Its process and above-mentioned branch
The process for holding the CCA detections of SRS transmission is similar.
Because each UE before transmission SRS or PUSCH data, is provided in cell
CCA detections are carried out at reserved time-domain resource so that each UE uplink is reduced
The interference transmitted in unlicensed band to other equipment, while can be effective according to channel status
Transmit SRS and PUSCH data in ground.
It should be noted that for reserved time-domain resource, can be according to concrete application scene
Reasonably it is configured, for example, considers UE ability, LAA power system capacities, unauthorized frequency
Other communication systems load etc. is taken, reserved time-domain resource can correspond on such as time
One OFDM symbol or on the time correspond to more than one OFDM symbol, even when
Between the upper time-domain resource corresponded to less than an OFDM symbol.
Below for involved in following three kinds different subframe situation embodiments of this disclosure
Time-domain resource is reserved to be specifically described.
● the situation of cell-specific SRS
According to one embodiment of the disclosure, in cell-specific SRS, followed by match somebody with somebody
Before the SRS symbols put, certain time-domain resource is reserved.For example uplink can be pre-
Blanked in the corresponding OFDM symbol stayed.Thus, whether to cell-specific SRS
Single SRS transmission, the SRS transmission together with PUSCH are again without configuration in subframe
SRS PUSCH transmission, reserved time-domain resource, can to LBT processes are performed with chance
For carrying out CCA detections.
Be used as a specific example, it is contemplated that in current LTE always subframe last
OFDM symbol transmits SRS, thus reserved time-domain resource can be current SRS in LTE
Resource in the SRS of configuration before last OFDM symbol, for example, can be located at
Penultimate OFDM symbol in subframe.
As another specific example, SRS transmission position can be moved to the first of subframe
Individual OFDM symbol, now, reserved time-domain resource can be the tail portions in preceding subframe
Time-domain resource, for example, can be located at last OFDM symbol in preceding subframe.This feelings
Condition for positioning sub-frame of uplink in LBT positions will be it is beneficial, now, reserved time domain
Resource can be located at last OFDM symbol of sub-frame of uplink.
According to another embodiment of the disclosure, when UE is not configured or is triggered with small
SRS transmission in the special SRS in area and it is scheduled as and then SRS symbols
During PUSCH transmission, UE still performs LBT processes in reserved time-domain resource, and
If LBT processes success, in the symbol for transmitting SRS transmit stick signal so as to for
Follow-up PUSCH transmission keeps channel.Now, UE transmits the stick signal, while not shadow
Ring the SRS transmission that other users equipment is carried out.This will be beneficial so that the UE is matched somebody with somebody
The PUSCH transmission put can be not disrupted.
According to another embodiment of the disclosure, in order to carry out respectively PUSCH transmission and
The CCA detections of SRS transmission, when can be for example to the start-up portion of each cell-specific subframe
Domain resource and back to back part time-domain resource is reserved before SRS symbols.
● the situation of non-SRS (common) subframe
According to one embodiment of the disclosure, it will transmit PUSCH's to and then next
Time-domain resource before starting point (such as sub-frame boundary or OFDM symbol #1) is reserved.
As a specific example, the mesh detected for the CCA of SRS transmission or PUSCH transmission
, the tail portion time-domain resource of each non-SRS is reserved, for example, reserves each non-SRS
Last OFDM symbol of subframe.As another specific example, for PUSCH
The purpose of the CCA detections of transmission, to each sub-frame of uplink start-up portion time-domain resource, for example
First OFDM symbol of each sub-frame of uplink.
● the situation of descending-up switching subframe
According to one embodiment of the disclosure, for descending-up switching subframe, such as LTE
Special subframe in TDD, if only one symbol is used for up, disclosure proposition SRS
Transmission descending at this-up should not switch in subframe and be configured or trigger, because can
It can have insufficient time to perform LBT processes for UE.
If more than two symbol be used for it is up, SRS transmission can be in descending-up switching
It is configured in subframe or triggers.If SRS transmission is configured or triggered, descending-up switching
Such as penultimate symbol in subframe is reserved for SRS LBT processes, and last
One symbol is used for SRS transmission.Correspond to symbol second from the bottom alternatively it is also possible to only reserve
Number part time-domain resource.
As mentioned above, in order to defer to the LBT processes on unauthorized carrier wave, UE should
CCA detections are performed before SRS transmission, and SRS is only transmitted in channel idle.
The such scheme proposed using the disclosure, realizes SRS and PUSCH CCA detections,
Solve that UE is carrying out channel detection and when UE has data transfer in other cells, CCA
Detect the problem of possible and unreliable and SRS transmission is possible to be blocked.
Multiple specific embodiments are described below in conjunction with accompanying drawing 3-5, to be more clearly understood that this public affairs
The principle and essence opened.It should be noted that embodiment of the disclosure is for only for ease of reason
The purpose of solution, and with example, non-limiting more non-exhaustively describe numerous embodiments.
In addition, for the reason for convenient description, in the following example time-domain resource it is reserved only
Exemplified by corresponding to an OFDM symbol, as previously mentioned, for the reserved of time-domain resource,
Embodiment of the disclosure is not limited to correspond to the situation of an OFDM symbol, this area skill
Art personnel are readily appreciated that, in the feelings of the spirit or essential attributes without departing substantially from embodiment of the disclosure
Under condition, there may be some different implement.
Fig. 3 is that the example of uplink frame transmission in the LAA according to one embodiment of the disclosure is shown
It is intended to.Wherein, it is descending-up switching subframe by taking TDD special subframes in LTE as an example,
UpPTS only takes up configuration transmission PUSCH numbers in an OFDM symbol, non-SRS
According to configuration transmission PUSCH data and SRS signal in SRS.
In this embodiment, due in special subframe UpPTS only take up an OFDM symbol,
Therefore SRS transmission is not allowed in special subframe, but for the transmission of next sub-frame of uplink
LBT processes can be completed in UpPTS, therefore the symbol in UpPTS is reserved.
Configuration transmission PUSCH data, last OFDM of the subframe in non-SRS
Symbol is reserved for CCA detections.In SRS, penultimate OFDM symbol
Reserved for CCA detections, and last OFDM symbol retains for SRS transmission.
It can be seen from the embodiment LBT processes can subframe last OFDM
Performed in symbol or penultimate OFDM symbol.According to another implementation of the disclosure
Example, in order to position LBT position, SRS transmission in SRS and non-SRS
Position can be moved to first OFDM symbol of cell-specific SRS, such as Fig. 4
It is shown.In this case, the last symbol of each subframe is reserved for LBT.Now,
If SRS is transmitted together with PUSCH data, due in cell other users all in subframe
First OFDM symbol on transmit SRS, now the follow-up PUSCH transmission of the UE can
To continue without affecting SRS transmission, therefore can directly it be transmitted after SRS transmission
PUSCH data.
In another embodiment, first OFDM symbol of each sub-frame of uplink in order to
PUSCH transmission CCA detection purpose and reserve.Also, for the CCA of SRS transmission
The mesh of detection, and then the OFDM symbol before SRS symbols be reserved.Such case is such as
Shown in Fig. 5.In Figure 5, SRS has two OFDM symbols to be reserved, worst
In the case of, if each sub-frame of uplink has SRS transmission, then transport overhead will have
Uplink frame configuration in a larger increase, but the embodiment is that existing LTE frame structures are influenceed most
Small.
This is non-exhaustively described with different specific examples it should be understood that the above is only
The open uplink frame transmission plan proposed, with support to be used on unauthorized carrier wave SRS transmission and
The Channel Detection of PUSCH transmission, those skilled in the art are easily known without departing substantially from the disclosure
Embodiment spirit or essential attributes in the case of, also there are a variety of different uplink frames and pass
Transmission scheme, embodiment of the disclosure can be realized in other specific forms.
Fig. 6 gives how the technical scheme proposed according to the disclosure supports different up biographies
The example of defeated situation.As shown in fig. 6, the first subframe is equipped with the special SRS of cell/user
The sub-frame of uplink of subframe, the second subframe is generic uplink subframe.Assuming that following scenario：
- UE1 is scheduled with the PUSCH transmission in two subframes, and SRS transmission exists
Configured in first subframe；
- UE2 is configured in SRS transmission in the first subframe, and in this subframe not by
Scheduling is with PUSCH transmission；
- UE3 is scheduled with the PUSCH transmission in two subframes；
- UE4 is scheduled with the PUSCH transmission only in the second subframe；
- in the first subframe, UE1 and UE3 PUSCH transmission are in frequency domain multiplexing；
In second subframe, UE1, UE3 and UE4 PUSCH transmission are in frequency domain multiplexing.
The scheme proposed in accordance with an embodiment of the present disclosure, the specifically up biography for each UE
It is defeated can be as follows：
For UE1, the LBT processes of PUSCH transmission are directed in the first subframe previous
Performed in last OFDM symbol of common subframe.PUSCH transmission is to come from SRS
OFDM symbol #0 to #11 in subframe.LBT processes for SRS transmission are sub first
Performed in the penultimate OFDM symbol of frame.Because UE1 is also scheduled with the second subframe
In PUSCH transmission, PUSCH can after SRS transmission directly in the second subframe quilt
Transmission, while last OFDM symbol of reserved second subframe, for subsequent transmission
CCA detection, that is, in non-SRS on OFDM symbol #0 to #12 carry out
PUSCH transmission.
For UE2, it detects channel in the penultimate OFDM symbol of the first subframe
Availability.If channel is detected as the free time, the single SRS of UE2 can be transmitted.
For UE3, it is not configured or triggered with SRS transmission, and LBT processes are in SRS
In penultimate OFDM symbol in and non-SRS in last OFDM
Performed in symbol.Now due to data transfer be not allowed to SRS last
In OFDM symbol, to protect the SRS transmission of other UE in cell, retain letter
Number it should be transmitted by UE3 with busy channel.For example, the stick signal can be SRS sequences,
It is orthogonal with existing SRS sequences.Or, stick signal can be in order to channel retain and
The UE dedicated sequences of PUSCH transmitted over resources.
For UE4, it is scheduled to only have the PUSCH transmission in non-SRS subframes, on
Row transmission is similar with UE3 process.
Fig. 7 is up frame forwarding apparatus schematic diagram in accordance with an embodiment of the present disclosure.According to this
Disclosed one embodiment includes there is provided a kind of up frame forwarding apparatus, the device：Transmission
Unit 701, is configured as to close to for transmission channel detection reference signal (SRS)
Specific time-domain resource before OFDM symbol is reserved；And CCA detection units, quilt
It is configured to carry out clear channel assessment (CCA) (CCA) detection at reserved time-domain resource.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：To close to for transmitting
Specific time domain money before the OFDM symbol of Physical Uplink Shared Channel (PUSCH) data
Source is reserved, and the progress CCA detections at reserved time-domain resource.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：Configure cell-specific SRS
Subframe so that in last OFDM symbol of cell-specific SRS or first
SRS signal is transmitted in OFDM symbol.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：In cell-specific SRS
When transmitting the SRS signal in first OFDM symbol of subframe, by cell-specific SRS
The tail portion time-domain resource of the previous subframe of subframe is reserved, for supporting SRS transmission
CCA detection.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：In cell-specific SRS
When transmitting the SRS signal in first OFDM symbol of subframe, by each sub-frame of uplink
Tail portion time-domain resource reserve, for supporting SRS transmission and/or PUSCH transmission
CCA detection.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：In cell-specific SRS
SRS signal is transmitted in first OFDM symbol of subframe and in cell-specific subframe
When transmitting PUSCH data, the PUSCH data are transmitted close to SRS signal.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：When in cell-specific SRS
During last OFDM symbol transmission SRS signal of subframe, by rising for each sub-frame of uplink
Initial portion time-domain resource is reserved, while by close to the OFDM symbol for transmitting SRS signal
Part time-domain resource before is reserved, for supporting SRS transmission and/or PUSCH transmission
CCA detection.
In accordance with an embodiment of the present disclosure, in addition to：Wherein reserved time-domain resource includes the time
The upper time-domain resource for corresponding to OFDM symbol or corresponding to more than one
The time-domain resource of OFDM symbol or provided corresponding to the time domain less than OFDM symbol
Source.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：Configurating downlink-up is cut
Change subframe so that when descending-up switch in subframe only has an OFDM symbol for up
When, do not transmit SRS signal in descending-up switching subframe.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：Reserve descending-up cut
Last OFDM symbol of subframe is changed, after descending-up switching subframe of support
Sub-frame of uplink transmission CCA detection.
In accordance with an embodiment of the present disclosure, transmission unit is additionally configured to：When using descending-up
There are two OFDM symbols to be used in switching subframe and descending-up switching subframe up
When, in last OFDM transmission SRS signal of descending-up switching subframe, and in advance
The penultimate OFDM symbol of row-up switching subframe is left, for supporting SRS
The CCA detections of transmission.
Pass through the teaching gone out given in above description and relevant drawings, this public affairs described herein
The many modifications and other embodiment opened will be by disclosure those skilled in the relevant art
Recognized.Therefore, it is understood that embodiment of the present disclosure is not limited to institute
Disclosed embodiment, and modification and other embodiment are intended to be included in this
Within scope of disclosure.In addition, although above description and relevant drawings are in part and/or function
Some example combination forms background under example embodiment is described, but should
When it is appreciated that part and/or the various combination of function can be provided by alternate embodiment
Form is without departing from the scope of the present disclosure.On this point, for example, clearly being retouched with more than
The different part and/or other combining forms of function stated also are expected in the disclosure
Within the scope of.Although concrete term is employed herein, they are only with general and description
The implication of property uses and is not intended to and is limited.
Claims (22)
1. a kind of up frame transmission method, including：
To close to before the OFDM symbol for transmission channel detection reference signal (SRS)
Specific time-domain resource reserved；And
Clear channel assessment (CCA) (CCA) detection is carried out at the reserved time-domain resource.
2. according to the method described in claim 1, in addition to：
To being accorded with close to the OFDM for transmitting physical Uplink Shared Channel (PUSCH) data
Specific time-domain resource before number is reserved, and
CCA detections are carried out at the reserved time-domain resource.
3. method according to claim 1 or 2, in addition to：
Configure cell-specific SRS so that in the last of the cell-specific SRS
The SRS signal is transmitted in one OFDM symbol or first OFDM symbol.
4. method according to claim 3, further comprises：
The SRS is transmitted in first OFDM symbol of the cell-specific SRS
During signal, the tail portion time domain of the previous subframe of the cell-specific SRS is provided
Source is reserved, for supporting the CCA detections of SRS transmission.
5. method according to claim 3, further comprises：
The SRS is transmitted in first OFDM symbol of the cell-specific SRS
During signal, the tail portion time-domain resource of each sub-frame of uplink is reserved, for supporting SRS
The CCA detections of transmission and/or PUSCH transmission.
6. method according to claim 3, further comprises：
The SRS is transmitted in first OFDM symbol of the cell-specific SRS
Signal and in the cell-specific subframe transmit PUSCH data when, the PUSCH
Data are transmitted close to the SRS signal.
7. method according to claim 3, further comprises：
When last OFDM symbol transmission SRS letters in the cell-specific SRS
Number when, the start-up portion time-domain resource of each sub-frame of uplink is reserved, at the same will close to for
Part time-domain resource before transmitting the OFDM symbol of SRS signal is reserved, for supporting
The CCA detections of SRS transmission and/or PUSCH transmission.
8. the method according to claim 1, wherein the reserved time-domain resource bag
Include and correspond to the time-domain resource of OFDM symbol on the time or corresponding to more than one
OFDM symbol time-domain resource or corresponding to the time domain less than an OFDM symbol
Resource.
9. according to the method described in claim 1, in addition to：
Configurating downlink-up switching subframe so that only have when in descending-up switching subframe
When one OFDM symbol is used for up, do not transmitted in descending-up switching subframe
SRS signal.
10. method according to claim 9, in addition to：
Last OFDM symbol of reserved descending-up switching subframe, for branch
Hold it is described it is descending-up switching subframe after sub-frame of uplink transmission CCA detection.
11. according to the method described in claim 1, in addition to：
Have two in using descending-up switching subframe and descending-up switching subframe
When individual OFDM symbol is used for up, in last of descending-up switching subframe
SRS signal described in OFDM transmission, and reciprocal the of reserved descending-up switching subframe
Two OFDM symbols, for supporting the CCA detections of SRS transmission.
12. a kind of up frame forwarding apparatus, including：
Transmission unit, is configured as to close to for transmission channel detection reference signal (SRS)
OFDM symbol before specific time-domain resource reserved；And
CCA detection units, are configured as carrying out idle letter at the reserved time-domain resource
Assess (CCA) detection in road.
13. device according to claim 12, wherein the transmission unit is also configured
For：
To being accorded with close to the OFDM for transmitting physical Uplink Shared Channel (PUSCH) data
Specific time-domain resource before number is reserved, and
The CCA detection units are additionally configured to：
CCA detections are carried out at the reserved time-domain resource.
14. the device according to claim 12 or 13, wherein the transmission unit also by
It is configured to：
Configure cell-specific SRS so that in the last of the cell-specific SRS
The SRS signal is transmitted in one OFDM symbol or first OFDM symbol.
15. device according to claim 14, wherein the transmission unit is also configured
For：
The SRS is transmitted in first OFDM symbol of the cell-specific SRS
During signal, the tail portion time domain of the previous subframe of the cell-specific SRS is provided
Source is reserved, for supporting the CCA detections of SRS transmission.
16. device according to claim 14, wherein the transmission unit is also configured
For：
The SRS is transmitted in first OFDM symbol of the cell-specific SRS
During signal, the tail portion time-domain resource of each sub-frame of uplink is reserved, for supporting SRS
The CCA detections of transmission and/or PUSCH transmission.
17. device according to claim 14, wherein the transmission unit is also configured
For：
The SRS is transmitted in first OFDM symbol of the cell-specific SRS
Signal and in the cell-specific subframe transmit PUSCH data when, the PUSCH
Data are transmitted close to the SRS signal.
18. device according to claim 14, wherein the transmission unit is also configured
For：
When last OFDM symbol transmission SRS letters in the cell-specific SRS
Number when, the start-up portion time-domain resource of each sub-frame of uplink is reserved, at the same will close to for
Part time-domain resource before transmitting the OFDM symbol of SRS signal is reserved, for supporting
The CCA detections of SRS transmission and/or PUSCH transmission.
19. the device according to claim 12, wherein the reserved time-domain resource
Including corresponding to the time-domain resource of OFDM symbol on the time or corresponding to more than one
The time-domain resource of individual OFDM symbol or corresponding to less than OFDM symbol when
Domain resource.
20. device according to claim 12, wherein the transmission unit is also configured
For：
Configurating downlink-up switching subframe so that only have when in descending-up switching subframe
When one OFDM symbol is used for up, do not transmitted in descending-up switching subframe
SRS signal.
21. device according to claim 20, wherein the transmission unit is also configured
For：
Last OFDM symbol of reserved descending-up switching subframe, for branch
Hold it is described it is descending-up switching subframe after sub-frame of uplink transmission CCA detection.
22. device according to claim 12, wherein the transmission unit is also configured
For：
Have two in using descending-up switching subframe and descending-up switching subframe
When individual OFDM symbol is used for up, in last of descending-up switching subframe
SRS signal described in OFDM transmission, and reciprocal the of reserved descending-up switching subframe
Two OFDM symbols, for supporting the CCA detections of SRS transmission.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610084046.5A CN107046732B (en) | 2016-02-05 | 2016-02-05 | Uplink frame transmission method and device |
| PCT/IB2017/000169 WO2017134527A1 (en) | 2016-02-05 | 2017-01-24 | Method and apparatus for uplink frame transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610084046.5A CN107046732B (en) | 2016-02-05 | 2016-02-05 | Uplink frame transmission method and device |
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| CN107046732A true CN107046732A (en) | 2017-08-15 |
| CN107046732B CN107046732B (en) | 2020-04-17 |
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| CN201610084046.5A Active CN107046732B (en) | 2016-02-05 | 2016-02-05 | Uplink frame transmission method and device |
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| CN (1) | CN107046732B (en) |
| WO (1) | WO2017134527A1 (en) |
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| BR112018072710A2 (en) | 2016-05-04 | 2019-02-19 | Huawei Tech Co Ltd | ua licensed assisted access system uplink transmission method, computer readable storage device and media |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2017134527A1 (en) | 2017-08-10 |
| CN107046732B (en) | 2020-04-17 |
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