CN104243012A - Distribution method and device for frame structures in TDD system - Google Patents
Distribution method and device for frame structures in TDD system Download PDFInfo
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- CN104243012A CN104243012A CN201310236766.5A CN201310236766A CN104243012A CN 104243012 A CN104243012 A CN 104243012A CN 201310236766 A CN201310236766 A CN 201310236766A CN 104243012 A CN104243012 A CN 104243012A
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Abstract
The invention provides a method for assisting a user in executing interference cancellation and suppression operation through a network in a TDD eIMTA scene. In an embodiment, a serving cell transmits identifiers and frame structures of adjacent cells so that target UE can accurately cancel and suppress interference from downlink adjacent cells. By the adoption of the technical scheme, the problem that UE can not accurately execute interference cancellation and suppression operation in the eIMTA scene is solved; meanwhile, the compatibility of the UE with an existing system is maintained to the maximum extent.
Description
Technical field
The present invention relates to the scheme that in time-division two (TDD-Time Division Duplex) system, frame structure distributes, particularly relate to the tdd frame structure allocative decision based on Long Term Evolution (LTE-Long Term Evolution) framework.
Background technology
In traditional third generation partner program (3GPP-3rd Generation Partner Project) Long Term Evolution (LTE-Long Term Evolution) system, define the frame structure of time division duplex (TDD-Time Division Duplex) system, as shown in table 1, wherein D represents descending sub frame, U represents sub-frame of uplink, and S is special subframe:
Table 1:TDD LTE frame structure
3GPP introduces the research topic strengthening interference management transmission adjustment (eIMTA-Enhanced Interference Traffic Adaptation) in version (R-Release) 11, main thought is the demand according to community up-downgoing traffic carrying capacity, adjusts the frame structure of TDD system faster.3GPP have evaluated three kinds of possible adjustment cycles:
● 640 milliseconds (ms-millisecond): existing R11 system can pass through system information block (SIB-System Information Block) support
● 100ms: existing R11 system is not supported, is realized by RRC signaling
● 10ms: existing R11 system is not supported, is realized by dynamic signaling
The adjustment cycle of 10ms can provide the maximum degree of freedom and performance gain, thus finally becomes the eIMTA scheme that 3GPP R12 introduces.It is pass through the frame structure of common physical layer signaling dynamic-configuration present frame that conclusion is reached in RAN1#73 meeting.
Further, 3GPP R12 starts interference elimination Restrain measurement (NAICS:Network-Assisted Interference Cancellation and Suppression) of network assistance.Concrete NAICS scheme is not also determined, its concept is that the information issued by network assistance makes UE more effective execution interference to eliminate or AF panel operation, the possible information that issues comprises interference characteristic, the send mode of interference, interference band, adjacent cell reference signal, modulation coding mode of interference etc.
Summary of the invention
Inventor is found by research, and in TDD system, for Serving cell, the interference of the downstream signal of usual adjacent cell will much larger than the interference of upward signal.Inventor finds further, and after introducing eIMTA technology, the frame structure configuration of adjacent cell and Serving cell can be different, and namely the sub-frame of uplink of the corresponding adjacent cell of the descending sub frame of Serving cell, thus needs new solution to support NAICS.
The invention discloses the method for carrying out frame structure acquisition in the subscriber equipment (UE) of a kind of time division duplex (TDD) system, wherein, comprise the steps:
-receive the first signaling to obtain K cell i
1i
2i
kidentifier i
1i
2i
k
-receive the frame structure s that the second signaling obtains a described K community
1s
2s
k
Wherein, cell i
kframe structure be s
k, described K be more than or equal to 1 integer, described k is more than or equal to 1 and is less than or equal to K, and a described K community does not comprise the community sending described first signaling and described second signaling.Described identifier is one of following:
● physical cell identifier, is identified by master sync signal (PSS-Primary Synchronized Signal)/auxiliary synchronous signals (SSS-Secondary Synchronized Signal).
● cellular global identity symbol (CGI-Cell Global Identifier), the whole network is unique.
The quantity of above-mentioned physical cell identifier is 504, can be identified in theory by 9 information bits, but when some special screnes are disposed in a large number as cellulor, may occur the in short supply of cell identifier.Above-mentioned cellular global identity symbol can support the community of sufficient amount, but needs more information bit-28 bit.
Concrete, according to an aspect of the present invention, it is characterized in that, described first signaling is high-level signaling
Concrete, according to another aspect of the invention, it is characterized in that, described second signaling is physical layer signaling
Described first signaling and described second signaling are sent by the Serving cell of UE, the interfered cell considering UE generally can not dynamic change, described first signaling is high-level signaling, such as wireless heterogeneous networks (RRC-Radio Resource Control) signaling.Further described first signaling is RRC common signaling or the proprietary signaling of RRC, and the former is suitable for for users all in community, and the latter is only applicable to particular UE.In order to support eIMTA, described second signaling is physical layer signaling, and further, described second signaling is the specific signaling in community or the specific signaling of UE, and the former is saving resource expense comparatively, and the latter is comparatively flexible.
If support that quick interfered cell is selected, described first signaling is physical layer signaling, and described second signaling is also physical layer signaling.
As an embodiment, described first signaling is system information block, wherein comprises a described K cell identifier, and described second signaling is common downlink physical layer signaling, wherein comprises the cell i of K described in present frame
1i
2i
kframe structure.
Concrete, according to an aspect of the present invention, it is characterized in that, also comprise the steps:
-perform for community at subframe t
signal perform interference eliminate suppress operation
Wherein, described subframe t is in described community
frame structure
in are all descending sub frames, described in
described i
1i
2i
ksubset.
Even if after eIMTA introduces and causes the frame structure difference of neighbor cell, the interference that UE receives neighbor cell mainly descending interference-uplink interference is generally less and be difficult to carry out interference and eliminate and suppress to operate.Therefore, UE mainly performs interference elimination suppression operation for the downstream signal of adjacent cell, and for different downstream signal types, method of operation also has difference.Typical method of operation has: for some community common signals such as cell common reference signal (CRS-Cell Reference Signal)/PSS/SSS/ Physical Broadcast Channel (PBCH-Physical Broadcasting Channel), UE performs Nonlinear perturbations and eliminates operation, namely the channel impulse response of adjacent cell to UE is first estimated, then recover the interference Received signal strength of CRS/PSS/SSS/PBCH signal at UE receiver of adjacent cell, UE Received signal strength deducts described interference Received signal strength; AF panel operation is performed for data-signal (PDSCH-Physicai Downlink Shared Channel), namely first estimates the channel impulse response of adjacent cell to UE, and then structure prewhitening filter performs whitening operation to UE Received signal strength.
UE in theory can to whole described cell i
1i
2i
kdescending interference signal perform interference and eliminate and suppress operation, but consider that the channel suppressing to need to estimate adjacent cell is eliminated in interference, will consider the signal strength signal intensity of adjacent cell in practical operation, UE can independently determine to eliminate all or part of described cell i
1i
2i
kin descending interference signal, concrete algorithm belongs to and realizes related content.
The invention discloses the method for carrying out frame structure configuration in the system equipment of a kind of time division duplex (TDD) system, wherein, comprise the steps:
-send the first signaling instruction K cell i
1i
2i
kidentifier i
1i
2i
k
-send the frame structure s that the second signaling indicates a described K community
1s
2s
k
Wherein, cell i
kframe structure be s
k, described K be more than or equal to 1 integer, described k is more than or equal to 1 and is less than or equal to K, and a described K community does not comprise the transmission community of described first signaling and described second signaling.
Concrete, according to an aspect of the present invention, it is characterized in that, described first signaling is high-level signaling
Concrete, according to another aspect of the invention, it is characterized in that, described second signaling is physical layer signaling
The invention discloses a kind of subscriber equipment (UE), it is characterized in that, this equipment comprises:
First module: receive the first signaling and obtain K cell i
1i
2i
kidentifier i
1i
2i
k
Second module: receive the frame structure s that the second signaling obtains a described K community
1s
2s
k
Wherein, cell i
kframe structure be s
k, described K be more than or equal to 1 integer, described k is more than or equal to 1 and is less than or equal to K, and a described K community does not comprise the transmission community of described first signaling and described second signaling.
As an embodiment, also comprise in the said equipment:
3rd module: perform for community at subframe t
signal perform interference eliminate suppress operation
Wherein, described subframe t is in described community
frame structure
in are all descending sub frames, described in
described i
1i
2i
ksubset.
The invention discloses a kind of system equipment, it is characterized in that, this equipment comprises:
First module: send the first signaling instruction K cell i
1i
2i
kidentifier i
1i
2i
k
Second module: send the frame structure s that the second signaling indicates a described K community
1s
2s
k
Wherein, cell i
kframe structure be s
k, described K be more than or equal to 1 integer, described k is more than or equal to 1 and is less than or equal to K, and a described K community does not comprise the transmission community of described first signaling and described second signaling.
The invention solves UE in eIMTA scene and accurately cannot perform the problem that suppression operation is eliminated in interference, the frame structure being issued neighbor cell by network makes object UE accurately can eliminate the descending adjacent cell interference of suppression, and the present invention at utmost maintains the compatibility with existing system.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more apparent:
Fig. 1 shows UE according to an embodiment of the invention and receives the schematic diagram that Serving cell signaling obtains two adjacent cell frame structures;
Fig. 2 shows the schematic flow sheet that UE according to an embodiment of the invention receives the signaling acquisition adjacent cell frame structure that Serving cell sends;
Fig. 3 shows the structured flowchart for the device in UE according to an embodiment of the invention;
Embodiment
Hereafter will be described in further detail technical scheme of the present invention by reference to the accompanying drawings, and it should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine arbitrarily mutually.
Embodiment 1
Embodiment 1 illustrates UE reception Serving cell signaling and obtains two adjacent cell frame structures, as shown in Figure 1.In accompanying drawing 1, community 10 is Serving cells of UE40, and community 20 and community 30 are two adjacent cells of community 10.UE40 receives the cell identifier that proprietary RRC signaling obtains community 20 and community 30, receives descending scheduling signaling and obtains community 20 and community 30 frame structure at present frame.Described proprietary RRC signaling and described descending scheduling signaling are all the specific signalings of UE, are sent by connection 104 of eating dishes without rice or wine by described community 10.Described community 20 sends to community 10 by described community 20 by X2 interface, as accompanying drawing 1 connects shown in 201 at the frame structure of present frame.Described community 30 sends to community 10 by described community 30 by X2 interface, as accompanying drawing 1 connects shown in 301 at the frame structure of present frame.Described connection 201 and described connection 301 are not eated dishes without rice or wine, and are represented by dotted lines.
Embodiment 2
Embodiment 2 illustrates the flow process that UE receives the signaling acquisition adjacent cell frame structure that Serving cell sends, as shown in Figure 2.In accompanying drawing 2, cell i 3 is Serving cells of UEul, and cell i 1 and cell i 2 are adjacent cells of described cell i 3, and in step s11, i3 sends the cell identifier of the first physical layer signaling instruction i1 and i2, is respectively i1, i2.In step s12, the frame structure that i3 sends the present frame of the second physical layer signaling instruction i1 community and i2 community is respectively s1, s2, and wherein s1 is 1, s2 is 2.Described first physical layer signaling and described second physical layer signaling are the different information bits of same Physical Downlink Control Channel (PDCCH-Physical Downlink Control Channel).
In step s21, the cell identifier that u1 receives described first physics signaling acquisition i1 and i2 is respectively i1, i2, and in step s22, u1 receives described second physics signaling and obtains i1 community, and i2 community is respectively #1 at the frame structure of present frame, #2.
In step s31, i1 sends downstream signal in the subframe 0/1/4/5/6/9 (descending sub frame of frame structure #1) of present frame, in step s41, i2 sends downstream signal in the subframe 0/1/3/4/5/6/8/9 (descending sub frame of frame structure #2) of present frame.
In step s23, u1 performs interference and eliminates suppression operation.Operative algorithm one is:
-perform i1 community in subframe 0/1/4/5/6/9, the interference of i2 community is eliminated and is suppressed operation
-perform the interference elimination suppression operation to i2 community in subframe 3/8.
Operative algorithm two is:
-perform the interference elimination suppression operation to i1 community in subframe 0/1/4/5/6/9
Above-mentioned algorithm two does not perform the interference cancellation operation to i2 community.
Embodiment 3
Embodiment 3 illustrates the structured flowchart for the device in UE, as shown in Figure 3.In accompanying drawing 3, the device 300 in UE comprises three devices: receiving system 301, receiving system 302, and restraining device 303 is eliminated in interference.Described receiving system 301 receives the first signaling and obtains adjacent cell identifier, described receiving system 302 receives the second signaling and obtains adjacent cell frame structure, and interference elimination restraining device 303 is eliminated according to the downstream signal execution interference of described adjacent cell frame structure to described adjacent cell and suppressed to operate.
The all or part of step that one of ordinary skill in the art will appreciate that in said method can be carried out instruction related hardware by program and complete, and described program can be stored in computer-readable recording medium, as read-only memory, and hard disk or CD etc.Optionally, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Accordingly, each modular unit in above-described embodiment, can adopt example, in hardware to realize, and also can be realized by the form of software function module, the application is not limited to the combination of the software and hardware of any particular form.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improves, all should be included within protection scope of the present invention.
Claims (10)
1. carry out a method for frame structure acquisition in the subscriber equipment (UE) of time division duplex (TDD) system, wherein, comprise the steps:
-receive the first signaling to obtain K cell i
1i
2i
kidentifier i
1i
2i
k
-receive the frame structure s that the second signaling obtains a described K community
1s
2s
k
Wherein, cell i
kframe structure be s
k, described K be more than or equal to 1 integer, described k is more than or equal to 1 and is less than or equal to K, and a described K community does not comprise the community sending described first signaling and described second signaling.
2. method according to claim 1, is characterized in that, also comprises the steps:
-perform for community at subframe t
signal perform interference eliminate suppress operation
Wherein, described subframe t is in described community
frame structure
in are all descending sub frames, described in
described i
1i
2i
ksubset.
3. method according to claim 1, is characterized in that, described first signaling is high-level signaling.
4. method according to claim 1, is characterized in that, described second signaling is physical layer signaling.
5. carry out a method for frame structure configuration in the system equipment of time division duplex (TDD) system, wherein, comprise the steps:
-send the first signaling instruction K cell i
1i
2i
kidentifier i
1i
2i
k
-send the frame structure s that the second signaling indicates a described K community
1s
2s
k
Wherein, cell i
kframe structure be s
k, described K be more than or equal to 1 integer, described k is more than or equal to 1 and is less than or equal to K, and a described K community does not comprise the transmission community of described first signaling and described second signaling.
6. method according to claim 1, is characterized in that, described first signaling is high-level signaling.
7. method according to claim 1, is characterized in that, described second signaling is physical layer signaling.
8. a subscriber equipment (UE), it is characterized in that, this equipment comprises:
First module: receive the first signaling and obtain K cell i
1i
2i
kidentifier i
1i
2i
k
Second module: receive the frame structure s that the second signaling obtains a described K community
1s
2s
k
Wherein, cell i
kframe structure be s
k, described K be more than or equal to 1 integer, described k is more than or equal to 1 and is less than or equal to K, and a described K community does not comprise the transmission community of described first signaling and described second signaling.
9. equipment according to claim 8, is characterized in that, also comprises:
3rd module: perform for community at subframe t
signal perform interference eliminate suppress operation
Wherein, described subframe t is in described community
frame structure
in are all descending sub frames, described in
described i
1i
2i
ksubset.
10. a system equipment, is characterized in that, this equipment comprises:
First module: send the first signaling instruction K cell i
1i
2i
kidentifier i
1i
2i
k
Second module: send the frame structure s that the second signaling indicates a described K community
1s
2s
k
Wherein, cell i
kframe structure be s
k, described K be more than or equal to 1 integer, described k is more than or equal to 1 and is less than or equal to K, and a described K community does not comprise the transmission community of described first signaling and described second signaling.
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| CN201310236766.5A CN104243012B (en) | 2013-06-13 | 2013-06-13 | Frame structure distribution method and device in a kind of TDD system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104243012B (en) | 2019-06-14 |
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