CN103857042B - A kind of method that tdd frame is transmitted in symmetrical spectrum - Google Patents
A kind of method that tdd frame is transmitted in symmetrical spectrum Download PDFInfo
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- CN103857042B CN103857042B CN201210512237.9A CN201210512237A CN103857042B CN 103857042 B CN103857042 B CN 103857042B CN 201210512237 A CN201210512237 A CN 201210512237A CN 103857042 B CN103857042 B CN 103857042B
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Abstract
This application discloses a kind of method that tdd frame is transmitted in symmetrical spectrum, including：The TDD uplink-downlink configurations of current area are determined, and determine the sub-frame of uplink in tdd frame and descending sub frame；For a pair of symmetrical spectrums for transmitting tdd frame, the sub-frame of uplink of tdd frame is transmitted in the uplink spectrum in a pair of symmetrical spectrums, the descending sub frame of tdd frame is transmitted in the downstream spectrum in a pair of symmetrical spectrums.So, the transmission of tdd frame is realized on FDD frequency spectrums, so that Base-Band Processing when tdd frame is transmitted in TDD and FDD frequency spectrums is consistent；Meanwhile, when transmitting tdd frame, the transmission direction of FDD frequency spectrums does not change, and will not be clashed with other FDD systems.
Description
Technical field
The application is related to time division multiplexing（TDD）Tdd frame is transmitted in the transmission technology of frame, more particularly to a kind of symmetrical spectrum
Method.
Background technology
Two kinds of frame structures are defined in LTE protocol：Frame format 1, frame format 2, are directed to FDD-LTE and TDD-LTE respectively.
Wherein, the schematic diagram of frame format 1 is as shown in figure 1, the schematic diagram of frame format 2 is as shown in Figure 2.
Because FDD/TDD standards respectively define two kinds of frame formats, meanwhile, in current frequency planning, on FDD frequency spectrums
It is only used for transmitting and is only used for transmitting tdd frame on FDD frames, TDD frequency spectrums, therefore for FDD/TDD, Base-Band Processing is different
, two kinds of frame structures are corresponded respectively to, system complexity is added.
In symmetrical spectrum（Such as FDD frequency spectrums）Using tdd frame structure, a kind of most straightforward approach be by uplink spectrum, under
Line frequency spectrum is respectively set to two TDD carrier waves and used.But TDD carrier waves a frame in sometimes as it is up be used as sometimes under
OK, therefore the problem of this scheme inevitably results from coexisting with other adjacent FDD systems.Specifically, FDD system is small
Section planning initial stage, mutual interference can be all considered, adjacent frequency generally all be up or all be descending；And if will be upper
Line frequency spectrum is directly disposed as TDD carrier waves, will not produce serious coexist with adjacent frequency when the TDD carrier waves are used to transmit sub-frame of uplink
Interference problem, but when the TDD carrier waves are used to transmit descending sub frame, because its adjacent frequency is that uplink spectrum transmits upstream data, because
Interference is produced between this TDD carrier waves meeting and adjacent frequency（Interference of the descending transmission of TDD base stations to FDD base stations uplink receiving）；Similarly,
, will not be with adjacent frequency when the TDD carrier waves are used to transmit descending sub frame if FDD downstream spectrum is directly disposed as into TDD carrier waves
Serious mutual interference problem is produced, but when the TDD carrier waves are used to transmit sub-frame of uplink, because its adjacent frequency passes for downstream spectrum
Defeated downlink data, the then descending transmission of FDD base stations can produce larger interference to the uplink receiving of TDD base stations.Based on above-mentioned feelings
Condition, is used if uplink spectrum, downstream spectrum are respectively set into two TDD carrier waves, substantially infeasible in practice.
The content of the invention
The application provides a kind of method that tdd frame is transmitted in symmetrical spectrum, can send tdd frame on FDD frequency spectrums, from
And for tdd frame, no matter transmit or transmitted on TDD frequency spectrums on FDD frequency spectrums, its Base-Band Processing is identical, is reduced
System complexity.
A kind of method that tdd frame is transmitted in symmetrical spectrum, including：
The TDD uplink-downlink configurations of current area are determined, and determine the sub-frame of uplink in tdd frame and descending sub frame；
For a pair of symmetrical spectrums for transmitting the tdd frame, by the sub-frame of uplink of the tdd frame the pair of right
Claim to transmit in the uplink spectrum in frequency spectrum, by downstream spectrum of the descending sub frame of the tdd frame in the pair of symmetrical spectrum
Upper transmission.
It is preferred that when cell is accessed, UE is accessed in the downstream spectrum in fully compensated state.
It is preferred that when sub-frame of uplink and descending sub frame are mutually changed in the tdd frame, accordingly carrying out upper line frequency
The switching of spectrum and downstream spectrum.
It is preferred that according to the TDD uplink-downlink configurations of current area, it is determined that the TDD uplink-downlink configurations of complementary cell；It is described mutual
The tdd frame for mending cell is carried out after N bit shifts, and its sub-frame of uplink is identical with the time that the descending sub frame of current area tdd frame takes,
Descending sub frame is identical with the time that the sub-frame of uplink of current area tdd frame takes；N is the integer more than or equal to 0；
For the uplink spectrum, in the time interval for the sub-frame of uplink for transmitting the current area tdd frame, transmission is described
The sub-frame of uplink of complementary cell tdd frame；For the downstream spectrum, the descending sub frame of the current area tdd frame is being transmitted
Time interval, transmits the descending sub frame of the complementary cell tdd frame.
It is preferred that the TDD uplink-downlink configurations of the current area are with setting to 0, the TDD uplink-downlink configurations of the complementary cell
For configuration 1；
Or, the TDD uplink-downlink configurations of the current area are configuration 1, and the TDD uplink-downlink configurations of the complementary cell are
With setting to 0.
As seen from the above technical solution, in the application, the TDD uplink-downlink configurations of current area are determined, and are determined in tdd frame
Sub-frame of uplink and descending sub frame；For a pair of symmetrical spectrums for transmitting tdd frame, by the sub-frame of uplink of tdd frame this one
To being transmitted in the uplink spectrum in symmetrical spectrum, by the descending sub frame of tdd frame in the downstream spectrum in a pair of symmetrical spectrums
Transmission.So, the transmission of tdd frame is realized on FDD frequency spectrums, so that base when tdd frame is transmitted in TDD and FDD frequency spectrums
Tape handling is consistent；Meanwhile, when transmitting tdd frame, the transmission direction of FDD frequency spectrums does not change, will not be with other FDD systems
Clash.
Brief description of the drawings
Fig. 1 be the application in symmetrical spectrum transmit tdd frame method flow diagram；
Fig. 2 is that TDD uplink-downlink configurations are the schematic diagram for transmitting tdd frame on 0 in symmetrical spectrum；
Fig. 3 is that the transmission when TDD uplink-downlink configurations of main plot and complementary cell are respectively 0 and 1 in symmetrical spectrum is shown
It is intended to.
Embodiment
In order that the purpose of the application, technological means and advantage are more clearly understood, the application is done below in conjunction with accompanying drawing
It is further described.
Fig. 1 be the application in symmetrical spectrum tdd frame method flow diagram.As shown in figure 1, this method includes：
Step 101, the TDD uplink-downlink configurations of current area are determined, and determine the sub-frame of uplink in tdd frame and descending son
Frame.
Wherein, TDD uplink-downlink configurations can be determined according to system signaling, the every kind of different TDD uplink-downlink configurations of correspondence, all
There is the distribution of the sub-frame of uplink and descending sub frame of determination.
Step 102, the sub-frame of uplink of tdd frame is transmitted in uplink spectrum in a pair of symmetrical spectrums, by under tdd frame
Row subframe is transmitted in the downstream spectrum in a pair of symmetrical spectrums.
Transmission means in the application is referred to as UDD（Unified Division Duplexing time-frequency combinations duplex）Pass
It is defeated.Wherein, for a pair of symmetrical spectrums for transmitting tdd frame（Such as a pair of FDD frequency spectrums）, when transmitting tdd frame, keep former
This transmission direction is constant；In the transmission time of TDD sub-frame of uplink, TDD sub-frame of uplink is transmitted in uplink spectrum；In TDD
In the transmission time of descending sub frame, TDD descending sub frames are transmitted in downstream spectrum.It is specific to pass by taking TDD uplink-downlink configurations 0 as an example
Defeated schematic diagram is as shown in Figure 2.
As shown in Fig. 2 for eNB, in downstream spectrum in the time of correspondence subframe 0,1,5,6, eNB and UE are in downlink frequency
Sending and receiving for subframe 0,1,5,6 is carried out in spectrum respectively；In uplink spectrum in the time of correspondence subframe 2,3,4,7,8,9,
ENB and UE carry out the reception and transmission of subframe 2,3,4,7,8,9 respectively in uplink spectrum.
When cell is accessed, fully compensated state first is in downstream spectrum, treats that cell searching is finished, you can only accordingly matched
Descending sub frame received, and be then transmitted in sub-frame of uplink according to eNB timing.
In addition, in the transmitting procedure of above-mentioned carry out ascending-descending subframes, it is up with it is descending mutually changed when, for example
Conversion or subframe 4 of the subframe 1 to subframe 2 arrive conversion of subframe 5 etc., it is necessary to carry out corresponding frequency between up-downgoing frequency spectrum in Fig. 2
Point switching.
So far, the method flow for transmitting tdd frame in the application in symmetrical spectrum terminates.Using the TDD of above-mentioned the application
After frame transmission method, either eNB or UE, only need only to support tdd frame form i.e. can while support FDD/TDD frequency ranges,
And a set of baseband processing unit need to be only supported, the complexity of system realization is enormously simplify.Meanwhile, when transmitting tdd frame,
The transmission direction of FDD frequency spectrums does not change, and will not be clashed with other FDD systems.
Further, in above method flow and Fig. 2,50% resource of FDD frequency spectrums is only make use of, i.e., in up-downgoing
It is used to carry out corresponding up-downgoing data transfer in part-time on frequency spectrum.More fully to utilize FDD frequency spectrum resources, preferably
Ground, can also utilize remaining 50% FDD frequency spectrum resources, resettle a complementary cell, two community associated utilizations
FDD frequency spectrum resources, reach and FDD-LTE identical spectrum efficiencies.
Specifically, except utilizing a pair of up-downgoing spectrum transmissions current areas according to the method shown in above-mentioned Fig. 1 and Fig. 2（It is main
Cell）Tdd frame outside, a complementary cell can also be determined according to the TDD uplink-downlink configurations of current area；The complementation is small
The TDD uplink-downlink configurations in area meet following condition：
The tdd frame of complementary cell carries out the displacement of N, the sub-frame of uplink of tdd frame and current area after complementary cell displacement
The time that the descending sub frame of tdd frame takes is identical, the descending sub frame and current area tdd frame of tdd frame after complementary cell displacement
The time that sub-frame of uplink takes is identical；Wherein, N is the integer more than or equal to 0.
It is current small in transmission for the uplink spectrum for transmitting current area sub-frame of uplink when carrying out data transmission
The time interval of the sub-frame of uplink of area's tdd frame, the sub-frame of uplink of the complementary cell tdd frame of transmission；For for transmitting current area
The downstream spectrum of descending sub frame, in the time interval of the descending sub frame of transmission current area tdd frame, the complementary cell tdd frame of transmission
Descending sub frame.
According to current existing TDD uplink-downlink configurations, above-mentioned condition can be met with setting to 0 and configuring 1, as shown in figure 3, can
So that with the cell set to 0, as main plot, the cell for configuring 1 will be regard as complementary cell；Or, the cell for configuring 1 can be made
For main plot, complementary cell will be used as with the cell set to 0.So, two cells, can be abundant with the use of a pair of symmetrical spectrums
Utilize whole frequency spectrum resources.
By the above-mentioned means, for network side, equivalent to establishing two same coverage cells：Main plot+complementation is small
Area.For UE, according to the energy for receiving P-SCH/S-SCH, Stochastic accessing is to main plot or complementary cell, for UE's
Flow does not have any modification.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (5)
1. a kind of method that tdd frame is transmitted in symmetrical spectrum, it is characterised in that including：
The TDD uplink-downlink configurations of current area are determined, and determine the sub-frame of uplink in tdd frame and descending sub frame；
For a pair of frequency division multiplexing FDD frequency spectrums for transmitting the tdd frame, by the sub-frame of uplink of the tdd frame described one
To being transmitted in the uplink spectrum in FDD frequency spectrums, by downlink frequency of the descending sub frame of the tdd frame in the pair of FDD frequency spectrums
Transmitted in spectrum.
2. according to the method described in claim 1, it is characterised in that when cell is accessed, UE is in the downstream spectrum
Fully compensated state is accessed.
3. according to the method described in claim 1, it is characterised in that sub-frame of uplink and descending sub frame are carried out in the tdd frame
When mutually changing, the switching of uplink spectrum and downstream spectrum is accordingly carried out.
4. according to any described method in Claim 1-3, it is characterised in that matched somebody with somebody according to the TDD up-downgoings of current area
Put, it is determined that the TDD uplink-downlink configurations of complementary cell；The tdd frame of the complementary cell is carried out after N bit shifts, its sub-frame of uplink with
The time that the descending sub frame of current area tdd frame takes is identical, descending sub frame and the sub-frame of uplink occupancy of current area tdd frame
Time is identical；N is the integer more than or equal to 0；
For the uplink spectrum, in the time interval for the sub-frame of uplink for transmitting the current area tdd frame, the complementation is transmitted
The sub-frame of uplink of cell tdd frame；For the downstream spectrum, in the time for the descending sub frame for transmitting the current area tdd frame
Interval, transmits the descending sub frame of the complementary cell tdd frame.
5. method according to claim 4, it is characterised in that the TDD uplink-downlink configurations of the current area be with setting to 0,
The TDD uplink-downlink configurations of the complementary cell are configuration 1；
Or, the TDD uplink-downlink configurations of the current area are configuration 1, and the TDD uplink-downlink configurations of the complementary cell are configuration
0。
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| CN201210512237.9A CN103857042B (en) | 2012-12-04 | 2012-12-04 | A kind of method that tdd frame is transmitted in symmetrical spectrum |
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| CN201210512237.9A CN103857042B (en) | 2012-12-04 | 2012-12-04 | A kind of method that tdd frame is transmitted in symmetrical spectrum |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101287281A (en) * | 2007-04-11 | 2008-10-15 | 北京三星通信技术研究有限公司 | Transmission apparatus and method for scheduling control signaling of downlink in wireless communication system |
| CN102118756A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | Carrier aggregation method and dynamic spectrum allocation method |
| CN102487514A (en) * | 2010-12-06 | 2012-06-06 | 华为技术有限公司 | Method and equipment for coexisting WiMAX (Worldwide Interoperability for Microwave Access) system and TDD-LTE (Time Division Duplex Long Term Evolution) system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8811359B2 (en) * | 2010-04-15 | 2014-08-19 | Qualcomm Incorporated | Multiplexing of peer-to-peer (P2P) communication and wide area network (WAN) communication |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101287281A (en) * | 2007-04-11 | 2008-10-15 | 北京三星通信技术研究有限公司 | Transmission apparatus and method for scheduling control signaling of downlink in wireless communication system |
| CN102118756A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | Carrier aggregation method and dynamic spectrum allocation method |
| CN102487514A (en) * | 2010-12-06 | 2012-06-06 | 华为技术有限公司 | Method and equipment for coexisting WiMAX (Worldwide Interoperability for Microwave Access) system and TDD-LTE (Time Division Duplex Long Term Evolution) system |
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