CN102026298A - Method and system for eliminating SRS interference between different cell users in multi-point coordination - Google Patents

Method and system for eliminating SRS interference between different cell users in multi-point coordination Download PDF

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CN102026298A
CN102026298A CN2009100938641A CN200910093864A CN102026298A CN 102026298 A CN102026298 A CN 102026298A CN 2009100938641 A CN2009100938641 A CN 2009100938641A CN 200910093864 A CN200910093864 A CN 200910093864A CN 102026298 A CN102026298 A CN 102026298A
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srs
sequence
srs sequence
multipoint cooperative
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CN102026298B (en
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米德忠
夏树强
梁春丽
左志松
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception

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Abstract

The invention discloses a method for eliminating sounding reference signal (SRS) interference between different cell users in multi-point coordination, which comprises the following steps of: configuring same virtual cell identifier for user equipment (UE) performing multi-point coordinated transmission in the same multi-point coordinated transmission cell, and informing the UE performing the multi-point coordinated transmission in various cells of the virtual cell identifier; and generating sounding reference signals (SRS) by using the UE performing the multi-point coordinated transmission on the basis of the virtual cell identifier and sending to the network side. In the technical scheme, SRS sequences of the UE in different cells of the same CoMP set are generated on the basis of the same virtual cell identifier (ID), so the generated SRS sequences of the UE have good orthogonality, bearing positions are not limited when the SRS resources are configured for the cells in the CoMP set, different cyclic shifts are only configured for the SRS sequences of different UE in the CoMP cells occupying the same time frequency resource, and the interference between the SRS can be eliminated.

Description

Eliminate the method and system that SRS disturbs between the different districts user in the multipoint cooperative
Technical field
The present invention relates to eliminate multipoint cooperative (CoMP, Coordinate Multi-Point) surveys reference symbol (SRS between the different districts user in, Sounding reference symbol) technology of Gan Raoing, relate in particular to eliminate in a kind of senior Long Term Evolution (LTE-A, Long Term Evolution-Advanced) system and survey the method and system that reference symbol is disturbed in the multipoint cooperative between the different districts user.
Background technology
Along with people to improving constantly of requiring for future communications, the cell edge spectrum efficiency comes into one's own more, the transmission quality that how to improve cell edge becomes the problem of competitively studying with throughput.The multipoint cooperative transmission technology is utilized the cooperation transmission of a plurality of sub-districts transmitting antenna, can effectively solve the interference problem of cell edge, thereby improves the capacity and the reliability of Radio Link.Therefore, the CoMP technology has been introduced in the LTE-A system as a key technology.
In the CoMP technology, the cooperation transmission of each minizone is based upon each sub-district to the basis of the channel information of user terminal (UE, User Equipment).To this, a kind of direct method is that UE records each cooperation cell behind the channel condition information of UE by descending pilot frequency, explicitly is by physical layer ascending control channel (PUCCH, Physical Uplink Control Channel) or physical layer Uplink Shared Channel (PUSCH, Physical Uplink Shared Channel) feed back to the base station.This method can make the base station obtain than more comprehensive channel information, but the feedback overhead of this moment is very big, and it is very difficult that the up channel limited with respect to feedback capacity seems.A kind of improving one's methods is exactly implicit feedback, promptly to above-mentioned channel information through certain preliminary treatment, feed back to the base station after being converted into pre-coding matrix index information such as (PMI, Precoding Matrix Indicator).This method can reduce feedback overhead to a certain extent, but its expense is still very big, and this method is because the channel information that has adopted certain compress technique to cause the base station to obtain is not accurate enough.In addition, also having a kind of method is exactly to utilize the heterogeneite of up-downgoing channel, sends SRS by UE to each sub-district, and the UE that is recorded according to SRS by the base station replaces the corresponding downstream channel information to the uplink channel information of each sub-district.
Following mode is adopted in the generation of SRS sequence among the current LTE Rel-8: ZC (Zadoff-Chu) sequence that at first generates certain-length according to cell ID (ID), be called basic sequence, this basic sequence has a kind of like this character, be to have good orthogonality between the different shift sequences of same base sequence, and do not satisfy orthogonality between the different basic sequences based on different I D generation with it; UE carries out certain displacement according to upper-layer configured parameters and just can obtain corresponding SRS sequence on the basis of above-mentioned basic sequence.
Because in the CoMP transmission technology, need know that in base station side UE arrives the channel condition information of a plurality of minizones, adopt the method based on SRS like this, by the SRS that a plurality of cell detection UE send, the channel condition information that just can get between each sub-district and the UE is surveyed in the base station.Yet each sub-district ID usually and inequality like this, is positioned at the basic sequence difference of the SRS that the UE of different districts sends in the CoMP transmission.According to the principle of CoMP, the SRS that different UEs sends has identical bandwidth and frequency domain position.Like this, just do not have orthogonality between the SRS sequence that the UE of the different districts that generates based on different basic sequences sends, different UEs sends between the SRS will exist very large disturbance, thereby causes the Channel Detection decreased performance of base station side, and then reduces the CoMP transmission quality.
For top problem, some companies propose, SRS for the concentrated different districts UE of CoMP, adopt the mode of time-division or frequency division to send the SRS interference of avoiding the UE in the different districts, but, adopt the method for time-division, the SRS that is different districts UE sends on different subframes respectively, like this channel condition information that records of base station respectively corresponding different districts UE at the channel information of different time, CoMP transmission is had certain influence, also can bring certain restriction to the scheduling of SRS so in addition; And if adopt the frequency division method, the SRS that is different districts UE goes up transmission, the waste that can bring frequency resource like this at different Resource Block (RB, Resource Block), and the channel condition information that base station side obtains belongs to different frequency bands, so also can bring certain influence to the CoMP transmission.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of the elimination to survey the method and system that reference symbol is disturbed in the multipoint cooperative between the different districts user, and the SRS that can eliminate between the user terminal in the concentrated different districts of CoMP disturbs.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of elimination surveyed the method that reference symbol is disturbed between the different districts user in the multipoint cooperative, comprising:
For the identical virtual subdistrict of UE configuration that carries out the multipoint cooperative transmission in the same multipoint cooperative transmission set of cells identifies, and notify the UE that carries out the multipoint cooperative transmission in each sub-district with described virtual subdistrict sign; And
The UE that carries out the multipoint cooperative transmission represents to generate detection reference symbol SRS and be sent to network side based on described virtual subdistrict.
Preferably, described UE generates the SRS sequence based on described virtual subdistrict sign, comprising:
Described UE is that the SRS bandwidth parameter that described UE disposes is determined the length of the SRS sequence of described UE according to the sub-district of multipoint cooperative, and generates the basic sequence of the SRS sequence of described UE based on described virtual subdistrict sign; And
To be the shift parameters of the SRS sequence that described UE disposed and initial position message according to the sub-district of multipoint cooperative generate the SRS sequence to the basic sequence displacement back of the SRS sequence of described UE to described UE.
Preferably, be the length that SRS bandwidth parameter that described UE disposed is determined the SRS sequence of described UE according to the sub-district of multipoint cooperative, be specially:
According to determining that for the SRS bandwidth parameter that described UE disposed shared Resource Block RB counts P, determine the length of the SRS sequence of described UE again according to P, for: (P * 12)/2.
Preferably, describedly generate the basic sequence of the SRS sequence of described UE, comprising based on described virtual subdistrict sign:
If the length of SRS sequence is not more than 36, then determine the basic sequence of SRS sequence for the motif tabulation of the SRS sequence that described UE disposed by inquiry according to described virtual subdistrict sign; If the length of SRS sequence greater than 36, is then determined the basic sequence of the SRS sequence of described UE by following formula:
Figure B2009100938641D0000031
Figure B2009100938641D0000032
Wherein,
Figure B2009100938641D0000033
Be the length of the SRS sequence determined, x qExpression length is
Figure B2009100938641D0000034
The basic sequence of SRS sequence, For less than
Figure B2009100938641D0000036
Largest prime, wherein,
Figure B2009100938641D0000038
The q value is determined by described virtual subdistrict sign.
Preferably, described virtual identifying is different from the cell ID of each sub-district in the described multipoint cooperative.
Preferably, the value of described virtual identifying for the set 0,1,2 ..., the element among the 503}.
A kind of elimination surveyed the system that reference symbol is disturbed between the different districts user in the multipoint cooperative, comprising:
Determining unit is used to the identical virtual subdistrict sign of UE configuration of carrying out the multipoint cooperative transmission in the same multipoint cooperative transmission set of cells;
Notification unit is used for notifying each sub-district to carry out the UE of multipoint cooperative transmission described virtual subdistrict sign;
Generation unit is arranged in the UE that carries out the multipoint cooperative transmission, is used for generating SRS based on described virtual subdistrict sign; And
Transmitting element, the SRS sequence that is used for described generation unit is generated is sent to network side.
Preferably, described generation unit generates the SRS sequence based on described virtual subdistrict sign, comprise: the sub-district according to multipoint cooperative is that the SRS bandwidth parameter that described UE disposes is determined the length of the SRS sequence of described UE, and generates the basic sequence of the SRS sequence of described UE based on described virtual subdistrict sign; And
Being the shift parameters of the SRS sequence that described UE disposed and initial position message according to the sub-district of multipoint cooperative generates the SRS sequence to the basic sequence displacement back of the SRS sequence of described UE.
Preferably, described determining unit is the length that SRS bandwidth parameter that described UE disposed is determined the SRS sequence of described UE according to the sub-district of multipoint cooperative, is specially:
According to determining that for the SRS bandwidth parameter that described UE disposed shared Resource Block RB counts P, determine the length of the SRS sequence of described UE again according to P, for: (P * 12)/2.
Preferably, described generation unit generates the basic sequence of the SRS sequence of each sub-district based on described virtual subdistrict sign, comprise:, then determine the basic sequence of SRS sequence for the motif tabulation of the SRS sequence that described UE disposed by inquiry according to described virtual subdistrict sign if the length of SRS sequence is not more than 36; If the length of SRS sequence greater than 36, is then determined the basic sequence of the SRS sequence of described UE by following formula:
Figure B2009100938641D0000042
Wherein, Be the length of the SRS sequence determined, x qExpression length is
Figure B2009100938641D0000044
The basic sequence of SRS sequence, For less than
Figure B2009100938641D0000046
Largest prime, wherein,
Figure B2009100938641D0000047
Figure B2009100938641D0000048
The q value is determined by described virtual subdistrict sign.
Preferably, described virtual identifying is different from the cell ID of each sub-district in the described multipoint cooperative, and, the value of described virtual identifying for the set 0,1,2 ..., the element among the 503}.
Among the present invention, the UE that carries out the CoMP transmission in each sub-district for the CoMP collection is provided with identical virtual subdistrict ID, and this virtual subdistrict ID is notified to each UE that carries out the CoMP transmission that CoMP concentrates each sub-district, each UE that carries out the CoMP transmission is that the relevant parameter that described UE disposes is determined the SRS sequence according to this virtual subdistrict ID and CoMP sub-district, UE place, and is sent to network side.In the technical solution of the present invention, because same CoMP concentrates the SRS sequence of the UE that carries out the CoMP transmission of different districts to be based on identical virtual subdistrict ID and generates, the SRS sequence of therefore respectively carrying out the UE generation of CoMP transmission has good orthogonality, when the SRS resource of the UE that carry out CoMP transmission of configuration in each CoMP collection sub-district, the SRS sequence that needn't limit the UE that carries out CoMP transmission of different districts is positioned on the different carrier wave or subframe, and the different cyclic shift of SRS sequence configuration that only is required to be the UE that carries out the CoMP transmission different in the CoMP sub-district that takies identical running time-frequency resource just can be eliminated the interference problem between SRS.The present invention realizes simple and practical.
Description of drawings
Fig. 1 eliminates the flow chart of surveying the method for reference symbol interference in the multipoint cooperative between the different districts user for the present invention;
Fig. 2 is the SRS sequence carrying schematic diagram of UE in the CoMP cooperation cell of the present invention;
Fig. 3 eliminates the composition structural representation of surveying the system of reference symbol interference in the multipoint cooperative between the different districts user for the present invention.
Embodiment
Basic thought of the present invention is: the UE that carries out the CoMP transmission in each sub-district for the CoMP collection is provided with identical virtual subdistrict ID, and this virtual subdistrict ID is notified to each UE that carries out the CoMP transmission that CoMP concentrates each sub-district, each UE that carries out the CoMP transmission is that the relevant parameter that described UE disposes is determined the SRS sequence according to this virtual subdistrict ID and CoMP sub-district, UE place, and is sent to network side.In the technical solution of the present invention, because same CoMP concentrates the SRS sequence of the UE that carries out the CoMP transmission of different districts to be based on identical virtual subdistrict ID and generates, the SRS sequence of therefore respectively carrying out the UE generation of CoMP transmission has good orthogonality, when the SRS resource of the UE that carry out CoMP transmission of configuration in each CoMP collection sub-district, the SRS sequence that needn't limit the UE that carries out CoMP transmission of different districts is positioned on the different carrier wave or subframe, and the different cyclic shift of SRS sequence configuration that only is required to be the UE that carries out the CoMP transmission different in the CoMP sub-district that takies identical running time-frequency resource just can be eliminated the interference problem between SRS.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 eliminates the flow chart of surveying the method for reference symbol interference in the multipoint cooperative between the different districts user for the present invention, and as shown in Figure 1, the present invention eliminates the method for surveying the reference symbol interference in the multipoint cooperative between the different districts user and may further comprise the steps:
Step 101:, and notify the UE that carries out the multipoint cooperative transmission in each sub-district with described virtual subdistrict sign for the identical virtual subdistrict of UE configuration that carries out the multipoint cooperative transmission in the same multipoint cooperative transmission set of cells identifies.
Supposing that CoMP concentrates has three different districts, and some UE in each sub-district carries out the CoMP transmission, and wherein, UE1 is positioned at sub-district 1, and UE2 is positioned at sub-district 2, and UE3 is positioned at sub-district 3.According to agreement regulation, the set of the ID value of each sub-district for 0,1,2 ..., 503} supposes that the ID of above-mentioned three sub-districts is respectively 125,230 and 350.Base station side is distributed an identical virtual ID for the UE that carries out the multipoint cooperative transmission in this CoMP set of cells, uses
Figure B2009100938641D0000061
Expression, this value is different with above-mentioned three sub-district ID separately, and its value is 280.It will be appreciated by those skilled in the art that above-mentioned value can also be 0,1,2 ..., any one value among the 503} except that 125,230,350 and 280.
With determined Value is notified to all UE that carry out the CoMP transmission in the CoMP set of cells, and here, base station side will by Radio Resource control (RRC, Radio Resource Control) signaling
Figure B2009100938641D0000063
Value is notified to all UE that carry out the CoMP transmission in the CoMP set of cells; Perhaps, be notified to the UE that carries out the CoMP transmission of each sub-district in the CoMP set of cells by the implicit expression mode, being about to should
Figure B2009100938641D0000064
Be worth relatedly with existing downstream parameter, the existing parameter by existing transmission makes the UE that carries out the CoMP transmission determine this
Figure B2009100938641D0000065
Value, for example, by adopting specific coded system to indicate this to existing parameter
Figure B2009100938641D0000066
Value, certain coded system is corresponding to concrete virtual subdistrict sign.Also can be with in the CoMP set of cells Value is fixing, configuration different CoMP set of cells in UE Value when UE determines to be arranged in the CoMP set of cells, finds out this CoMP set of cells correspondence of being disposed
Figure B2009100938641D0000073
Value gets final product, and needn't notify this more separately
Figure B2009100938641D0000074
Value.
Step 102: the UE that carries out the multipoint cooperative transmission generates based on described virtual subdistrict sign and surveys reference symbol SRS and be sent to network side.
UE determines the length of the SRS sequence of each sub-district according to each sub-district of multipoint cooperative for the SRS bandwidth parameter of this UE configuration, and generates the basic sequence of the SRS sequence of this UE based on described virtual subdistrict sign; UE is according to for the shift parameters of the SRS sequence that UE disposed of carrying out CoMP transmission and initial position message the basic sequence displacement back of the SRS sequence of this UE of being determined being generated the SRS sequence in the multipoint cooperative set of cells.
The system bandwidth that is disposed of supposing above-mentioned three sub-districts is 20M.According to the principle of CoMP, multipoint cell concentrates the SRS of the UE correspondence of carrying out the multipoint cooperative transmission should have identical bandwidth, and has identical frequency domain position.Suppose that the base station is that the SRS bandwidth that three UE dispose is 8 RB, place that therefore, the SRS sequence length that three UE in above-mentioned three sub-districts send is (8 * 12)/2=48 because SRS adopts every position (every carrier wave).Because this SRS sequence length is greater than 36, so the basic sequence of this SRS adopts based on the Zadoff-Chu sequence and generates, referring to following formula:
r ( n ) = x q ( n mod N ZC RS ) , 0 &le; n < M sc RS
R (n) represents Zadoff-Chu sequence (basic sequence),
Figure B2009100938641D0000077
Be the length (originally being exemplified as 48) of the SRS sequence of the UE that determined, x qExpression length is
Figure B2009100938641D0000078
The basic sequence of SRS sequence of UE, For less than
Figure B2009100938641D00000710
Largest prime (originally being exemplified as 47), wherein,
Figure B2009100938641D00000711
Figure B2009100938641D00000712
The q value is determined by described virtual subdistrict sign.About definite method of q value, can be referring to the relevant regulations among the RS36.211.
When above-mentioned definite SRS sequence length was not more than 36, according to the regulation of related protocol in the LTE-A system, by the set SRS sequence length and the mapping table of SRS basic sequence, the SRS basic sequence of determining concrete UE by the mode of tabling look-up got final product.
For identical virtual ID, consider that simultaneously the concentrated different time-frequency position that SRS sent of cooperation is identical, so the employed basic sequence of SRS of the UE1 in this example, UE2 and UE3 is identical.
Here it is to be noted, above-mentioned Zadoff-Chu sequence, has such character: have good orthogonality between the different displacements of Zadoff-Chu sequence that generate based on identical q, but the orthogonality that is based between the Zadoff-Chu sequence that different q generate is unsatisfactory.On the basis of above-mentioned same base sequence, the SRS sequence of different districts UE can be carried out different cyclic shifts on above-mentioned Zadoff-Chu sequence basis, has so just generated three UE SRS sequence separately.Concrete, according to three CoMP sub-districts separately the shift parameters of the SRS sequence of rrc layer configuration carry out corresponding cyclic shift, so just generated three UE SRS sequence separately.
At last, according to three CoMP sub-districts separately the initial position message of the SRS sequence of rrc layer configuration determine the initial position of the SRS sequence of three UE, thereby the SRS sequence of above-mentioned three UE is mapped on the correspondence position of carrier wave separately.Fig. 2 is the SRS sequence carrying schematic diagram of UE in the CoMP cooperation cell of the present invention, as shown in Figure 2, as previously mentioned, the SRS of three (only show the SRS sequence bearing mode of UE1, UE2 among the figure, the SRS sequence bearing mode of UE3 is identical with the bearing mode of UE1, UE2) UE occupies identical time-frequency position.
Because the SRS sequence of different districts UE was generated by the basic sequence cyclic shift that generates based on identical virtual ID during CoMP transmitted among the present invention, therefore, still keep good orthogonality between them, send SRS at the UE of different cooperation cell like this and just needn't avoid interference between them by the mode of time-division or frequency division, avoid the waste of running time-frequency resource, also can not increase the complexity of scheduling of resource.
Fig. 3 eliminates the composition structural representation of surveying the system of reference symbol interference in the multipoint cooperative between the different districts user for the present invention, as shown in Figure 3, the present invention eliminates the system that surveys the reference symbol interference in the multipoint cooperative between the different districts user and comprises determining unit 30, notification unit 31, generation unit 32 and transmitting element 33, wherein, determining unit 30 is used to the identical virtual subdistrict sign of UE configuration of carrying out the multipoint cooperative transmission in the same multipoint cooperative transmission set of cells; Notification unit 31 is used for notifying each sub-district to carry out the UE of multipoint cooperative transmission described virtual subdistrict sign; Generation unit 32 is arranged in the UE that carries out the multipoint cooperative transmission, is used for generating SRS based on described virtual subdistrict sign; The SRS sequence that transmitting element 33 is used for described generation unit is generated is sent to network side.Virtual identifying is different from the cell ID of each sub-district in the described multipoint cooperative, and, the value of described virtual identifying for the set 0,1,2 ..., the element among the 503}.
Concrete, generation unit 32 generates the SRS sequence based on described virtual subdistrict sign, comprise: the sub-district according to multipoint cooperative is that the SRS bandwidth parameter that described UE disposes is determined the length of the SRS sequence of described UE, and generates the basic sequence of the SRS sequence of described UE based on described virtual subdistrict sign; And
Being the shift parameters of the SRS sequence that described UE disposed and initial position message according to the sub-district of multipoint cooperative generates the SRS sequence to the basic sequence displacement back of the SRS sequence of described UE.
Determining unit 30 is the length that SRS bandwidth parameter that described UE disposed is determined the SRS sequence of described UE according to the sub-district of multipoint cooperative, is specially:
According to determining that for the SRS bandwidth parameter that described UE disposed shared Resource Block RB counts P, determine the length of the SRS sequence of described UE again according to P, for: (P * 12)/2.
Generation unit 32 generates the basic sequence of the SRS sequence of each sub-district based on described virtual subdistrict sign, comprise:, then determine the basic sequence of SRS sequence for the motif tabulation of the SRS sequence that described UE disposed by inquiry according to described virtual subdistrict sign if the length of SRS sequence is not more than 36; If the length of SRS sequence greater than 36, is then determined the basic sequence of the SRS sequence of described UE by following formula:
Figure B2009100938641D0000091
Figure B2009100938641D0000092
Wherein,
Figure B2009100938641D0000093
Be the length of the SRS sequence determined, x qExpression length is
Figure B2009100938641D0000094
The basic sequence of SRS sequence,
Figure B2009100938641D0000095
For less than
Figure B2009100938641D0000096
Largest prime, wherein,
Figure B2009100938641D0000098
The q value is determined by described virtual subdistrict sign.
Those skilled in the art are to be understood that, the system that surveys the reference symbol interference in the elimination multipoint cooperative shown in Figure 3 between the different districts user is for realizing that the method for surveying the reference symbol interference in the aforesaid elimination multipoint cooperative between the different districts user designs, the function of each processing unit can be with reference to the description of preceding method and understand in the system shown in Figure 3, the function of each processing unit can realize by the program that runs on the processor, also can realize by concrete logical circuit.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (11)

1. eliminate the method for surveying the reference symbol interference in the multipoint cooperative between the different districts user for one kind, it is characterized in that, comprising:
For the identical virtual subdistrict of UE configuration that carries out the multipoint cooperative transmission in the same multipoint cooperative transmission set of cells identifies, and notify the UE that carries out the multipoint cooperative transmission in each sub-district with described virtual subdistrict sign; And
The UE that carries out the multipoint cooperative transmission represents to generate detection reference symbol SRS and be sent to network side based on described virtual subdistrict.
2. method according to claim 1 is characterized in that, described UE generates the SRS sequence based on described virtual subdistrict sign, comprising:
Described UE is that the SRS bandwidth parameter that described UE disposes is determined the length of the SRS sequence of described UE according to the sub-district of multipoint cooperative, and generates the basic sequence of the SRS sequence of described UE based on described virtual subdistrict sign; And
To be the shift parameters of the SRS sequence that described UE disposed and initial position message according to the sub-district of multipoint cooperative generate the SRS sequence to the basic sequence displacement back of the SRS sequence of described UE to described UE.
3. method according to claim 2 is characterized in that, is the length that SRS bandwidth parameter that described UE disposed is determined the SRS sequence of described UE according to the sub-district of multipoint cooperative, is specially:
According to determining that for the SRS bandwidth parameter that described UE disposed shared Resource Block RB counts P, determine the length of the SRS sequence of described UE again according to P, for: (P * 12)/2.
4. according to claim 2 or 3 described methods, it is characterized in that, describedly generate the basic sequence of the SRS sequence of described UE, comprising based on described virtual subdistrict sign:
If the length of SRS sequence is not more than 36, then determine the basic sequence of SRS sequence for the motif tabulation of the SRS sequence that described UE disposed by inquiry according to described virtual subdistrict sign; If the length of SRS sequence greater than 36, is then determined the basic sequence of the SRS sequence of described UE by following formula:
Figure F2009100938641C0000011
Figure F2009100938641C0000012
Wherein, Be the length of the SRS sequence determined, x qExpression length is
Figure F2009100938641C0000014
The basic sequence of SRS sequence, For less than
Figure F2009100938641C0000016
Largest prime, wherein, The q value is determined by described virtual subdistrict sign.
5. method according to claim 4 is characterized in that described virtual identifying is different from the cell ID of each sub-district in the described multipoint cooperative.
6. method according to claim 5 is characterized in that, the value of described virtual identifying for the set 0,1,2 ..., the element among the 503}.
7. eliminate the system that surveys the reference symbol interference in the multipoint cooperative between the different districts user for one kind, it is characterized in that, comprising:
Determining unit is used to the identical virtual subdistrict sign of UE configuration of carrying out the multipoint cooperative transmission in the same multipoint cooperative transmission set of cells;
Notification unit is used for notifying each sub-district to carry out the UE of multipoint cooperative transmission described virtual subdistrict sign;
Generation unit is arranged in the UE that carries out the multipoint cooperative transmission, is used for generating SRS based on described virtual subdistrict sign; And
Transmitting element, the SRS sequence that is used for described generation unit is generated is sent to network side.
8. system according to claim 7, it is characterized in that, described generation unit generates the SRS sequence based on described virtual subdistrict sign, comprise: the sub-district according to multipoint cooperative is that the SRS bandwidth parameter that described UE disposes is determined the length of the SRS sequence of described UE, and generates the basic sequence of the SRS sequence of described UE based on described virtual subdistrict sign; And
Being the shift parameters of the SRS sequence that described UE disposed and initial position message according to the sub-district of multipoint cooperative generates the SRS sequence to the basic sequence displacement back of the SRS sequence of described UE.
9. system according to claim 8 is characterized in that, described determining unit is the length that SRS bandwidth parameter that described UE disposed is determined the SRS sequence of described UE according to the sub-district of multipoint cooperative, is specially:
According to determining that for the SRS bandwidth parameter that described UE disposed shared Resource Block RB counts P, determine the length of the SRS sequence of described UE again according to P, for: (P * 12)/2.
10. according to Claim 8 or 9 described systems, it is characterized in that, described generation unit generates the basic sequence of the SRS sequence of each sub-district based on described virtual subdistrict sign, comprise:, then determine the basic sequence of SRS sequence for the motif tabulation of the SRS sequence that described UE disposed by inquiry according to described virtual subdistrict sign if the length of SRS sequence is not more than 36; If the length of SRS sequence greater than 36, is then determined the basic sequence of the SRS sequence of described UE by following formula:
Figure F2009100938641C0000032
Wherein,
Figure F2009100938641C0000033
Be the length of the SRS sequence determined, x qExpression length is
Figure F2009100938641C0000034
The basic sequence of SRS sequence,
Figure F2009100938641C0000035
For less than
Figure F2009100938641C0000036
Largest prime, wherein,
Figure F2009100938641C0000037
Figure F2009100938641C0000038
The q value is determined by described virtual subdistrict sign.
11. system according to claim 10 is characterized in that, described virtual identifying is different from the cell ID of each sub-district in the described multipoint cooperative, and, the value of described virtual identifying for the set 0,1,2 ..., the element among the 503}.
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