CN102111879A - Method and equipment for distributing resources and sending channel state information pilot signal - Google Patents
Method and equipment for distributing resources and sending channel state information pilot signal Download PDFInfo
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- CN102111879A CN102111879A CN2009102432189A CN200910243218A CN102111879A CN 102111879 A CN102111879 A CN 102111879A CN 2009102432189 A CN2009102432189 A CN 2009102432189A CN 200910243218 A CN200910243218 A CN 200910243218A CN 102111879 A CN102111879 A CN 102111879A
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Abstract
The invention provides a method and equipment for distributing resources and sending a channel state information pilot signal. The invention discloses a method and equipment for distributing resources for a CSI-RS (channel state information-reference signal) and a method and equipment for sending a CSI-RS. The method mainly comprises the following steps: after the pilot carrier frequency shift amount of a target cell is determined according to the Cell ID (identity) of the target cell, frequency shift is carried out on RE (Resource Element) carrying the CSI-RS in a PRB (Physical Resource Block) according to the determined pilot carrier frequency shift; and because the RE carrying the CSI-RS and the RE carrying a UE (user equipment)-Specific Port5-RS adopt the same algorithm for frequency shift, the CSI-RS subjected to frequency shift and the UE-Specific Port5-RS subjected to frequency shift have no interference.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of channel condition information pilot signal (Channel State Information-Reference Signal in the wireless communications environment that is, CSI-RS) method of allocating resources, system and equipment, and a kind of method and apparatus that sends CSI-RS.
Background technology
Wireless channel is a kind of fading channel, passing through OFDM (Orthogonal FrequencyDivision Multiplex, when OFDM) symbol sends data, the expansion of multidiameter delay can cause intersymbol interference (Inter-Symbol Interference, ISI), and when under mobile status, receiving data by wireless channel, because the caused frequency displacement of Doppler effect meeting destroys the orthogonality between the ofdm system subcarrier, cause between subcarrier and to disturb (Inter Carrier Interference, ICI).Therefore, (Reference Signal RS), makes receiving terminal carry out channel estimating or channel detection according to the pilot signal that receives need to insert pilot signal in the signal that sends.
Ofdm system is at regular circulation prefix (Normal Cyclic Prefix, Normal CP) configuration down, (Physical Resource Block PRB) takies 14 OFDM symbols to a Physical Resource Block on time domain, take 12 subcarriers (sub carries) on frequency domain.(ResourceElement RE) is unit to pilot signal, and pilot signal takies a RE on the PRB (be on the frequency domain on subcarrier and the time domain OFDM symbol) with resource particle.The pilot signal that in LTE R8, defines be divided into public guide frequency (Common Reference Signal, CRS) and two kinds of special pilot frequency for user (UE-specific ReferenceSignal also claims DRS).
As shown in Figure 1, it is the schematic diagram that inserts pilot signal among each RE of a PRB, as can be seen from Figure 1, preceding 3 OFDM symbols of a PRB are Physical Downlink Control Channel (Physical DownlinkControl Channel, PDCCH), R0/R1/R2/R3 is respectively corresponding 4 CRS ports (Cell specific Port0/1/2/3) among the LTE R8.Because LTE R8 agreement is supported the Beamforming of single codeword single current (Single layer), therefore also designed the downlink user dedicated pilot of one group of single codeword single current, be defined as the RS (UE-specific Port5-RS) that antenna port 5 sends.Also transmit by PRB to the data (Data) that UE sends the base station of Serving cell, and the RE that distributes to Data does not overlap with the RE that distributes to PDCCH and each pilot signal (CRS and DRS).
Strong jamming takes place in the pilot signal for fear of neighbor cell on identical RE resource particle, CRS and DRS Cell ID according to the sub-district on frequency domain resource of neighbor cell carried out frequency displacement (frequencyshifting).Shown in Fig. 2 (a), Fig. 2 (b) and Fig. 2 (c), be the pilot carrier frequency shift schematic diagram of three neighbor cells, in three neighbor cells shown in Figure 2, the Cell ID of sub-district 1 is 0, the Cell ID of sub-district 2 is 1, and the Cell ID of sub-district 3 is 2, determines that the formula of pilot carrier frequency shift amount is:
Wherein, v
ShiftExpression pilot carrier frequency shift amount, N
ID CellThe physics Cell ID of expression sub-district, therefore, it is 0 that the CellID of sub-district 1 sentences 3 remainder, and then the pilot carrier frequency shift amount of sub-district 1 is 0, and the pilot carrier frequency shift amount of sub-district 1 is 1, and the pilot carrier frequency shift amount of sub-district 2 is 2.As can be seen from Figure 2, sub-district 2 is with respect to sub-district 11 subcarrier of translation upwards, and sub-district 3 is with respect to sub-district 12 subcarriers of translation upwards, avoids pilot tone strong jamming between 1～sub-district, sub-district 3 with this.
The LTE-Advanced system is the back to evolution system of LTE R8 system, in the LTE-Advanced system, need support demodulated pilot signal (the Demodulated ReferenceSignals of 8 flow transmission for user definition, DM-RS), be used for Physical Downlink Shared Channel (Physical Downlink Shared Channel, PDSCH) demodulation of middle data symbol.DM-RS with LTE-Advanced user in 3GPP is inserted in the row of the 6th, 7,13,14 on each the PRB Resource Block OFDM symbol, and shown in the PRB content among Fig. 2, the DM-RS of 1～sub-district, sub-district 3 is identical, does not need to carry out frequency displacement.
In addition, the LTE-Advanced system detects in order to support the CQI (Channel Quality Information) of high-order mimo under the 8Tx antenna configurations, also need to realize channel condition information (Channel State Information for the user in the LTE-Advanced system, the new pilot reference signal that adopts when CSI) measuring: the channel condition information pilot signal (Channel State Information-Reference Signal, CSI-RS).The function class of CSI-RS is similar to the public guide frequency CRS among the LTE R8, is used for the measurement of LTE-A subscriber channel state information, and maximum demand is supported 8 logic ports (8 CSI-RS Ports).
Preferably can avoid simultaneously when inserting the CSI-RS pilot signal in the PRB Resource Block passing through in PDCCH control channel, the LTE R8 system passing through the dedicated pilot signal (UE-SpecificPort5-RS) that antenna port 5 sends in antenna port 0,1,2 or 3 common pilot signals (CRSPort0/1/2/3) that send, the LTE R8 system, and the OFDM symbol at the demodulated pilot signal of LTE-Advanced (DM-RS) place, thereby with the minimum interference between user in the sub-district and the inter-cell user.If the OFDM symbol at the signal place that above-mentioned needs are avoided is all got rid of, the 11st row OFDM symbol among the only remaining PRB of the resource of then keeping for the CSI-RS pilot signal to send, and 12 RE of these row OFDM symbol be used for designing the CSI-RS of 8 logic ports may be not enough.
In order to increase the number of resources of the RE that can be used to insert the CSI-RS pilot signal, LTE-A user's CSI-RS can be inserted on the OFDM symbol at LTE R8 dedicated pilot UE-Specific Port5-RS place, that is: the resource particle RE that is not taken in the 4th, the 10 row OFDM symbols, and the RE that is not taken in the 7th, the 13 row OFDM symbols by the DM-RS in UE-Specific Port5-RS and the LTE-A system by UE-specific Port5-RS.
The resource quantity of inserting CSI-RS can be increased though on the OFDM symbol at LTE R8 dedicated pilot UE-Specific Port5-RS place, insert CSI-RS, following problem can be brought:
Strong jamming takes place in the pilot tone for fear of neighbor cell on identical RE, the RE of carrying UE-SpecificPort5-RS will carry out pilot carrier frequency shift according to the CellID of sub-district on frequency domain, if but after inserting CSI-RS on the OFDM symbol at the UE-Specific Port5-RS place in the PRB of a sub-district, may cause the strong jamming between the CSI-RS of insertion and the UE-Specific Port5-RS behind the pilot carrier frequency shift again.
Summary of the invention
The embodiment of the invention provides a kind of be CSI-RS method of allocating resources and equipment, and a kind of method and apparatus that sends CSI-RS, strongly disturbing problem appears to insert on the OFDM symbol that solves the UE-Specific Port5-RS place in the PRB of sub-district between the CSI-RS that causes insertion behind the CSI-RS and the UE-SpecificPort5-RS behind the pilot carrier frequency shift.
A kind of is the CSI-RS method of allocating resources, and described method comprises:
In the Physical Resource Block PRB of Target cell, select the resource particle RE of carrying CSI-RS;
Determine the pilot carrier frequency shift amount of Target cell according to the Cell ID of Target cell;
The RE of carrying CSI-RS among the Target cell PRB is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtain the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement.
A kind of method that sends CSI-RS, described method comprises:
In the Physical Resource Block PRB of Target cell, select the resource particle RE of carrying CSI-RS;
Determine the pilot carrier frequency shift amount of Target cell according to the Cell ID of Target cell;
The RE of carrying CSI-RS among the Target cell PRB is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtain the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement;
The RE of the carrying CSI-RS of the base station of indicating target sub-district after by the frequency displacement that obtains sends CSI-RS to UE.
A kind of is the equipment of CSI-RS Resources allocation, and described equipment comprises:
The resource selection module is used for the resource particle RE at the Physical Resource Block PRB of Target cell selection carrying CSI-RS;
The frequency shift amount determination module is used for determining according to the Cell ID of Target cell the pilot carrier frequency shift amount of Target cell;
The frequency displacement module is used for the RE of Target cell PRB carrying CSI-RS is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtains the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement.
A kind of equipment that sends CSI-RS, described equipment comprises:
The resource selection module is used for the resource particle RE at the Physical Resource Block PRB of Target cell selection carrying CSI-RS;
The frequency shift amount determination module is used for determining according to the Cell ID of Target cell the pilot carrier frequency shift amount of Target cell;
The frequency displacement module is used for the RE of Target cell PRB carrying CSI-RS is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtains the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement;
The RE of indicating module, the base station that is used to the to indicate Target cell carrying CSI-RS after by the frequency displacement that obtains sends CSI-RS to UE.
Because the RE of carrying UE-Specific Port5-RS carries out frequency displacement according to the definite pilot carrier frequency shift amount of the Cell ID of Target cell, RE to carrying CSI-RS among the PRB in the embodiment of the invention also carries out frequency displacement according to the definite pilot carrier frequency shift amount of the Cell ID of sub-district, the pilot carrier frequency shift amount that the RE that is to say the RE of carrying CSI-RS and carry UE-Specific Port5-RS carries out frequency displacement is identical, therefore, not not disturbing between the RE of the RE of the carrying CSI-RS after the frequency displacement and the carrying UE-Specific Port5-RS after the frequency displacement.
Description of drawings
Fig. 1 is the schematic diagram that inserts pilot signal among each RE of PRB in the background technology;
Fig. 2 (a), Fig. 2 (b) and Fig. 2 (c) are the pilot carrier frequency shift schematic diagram of three neighbor cells in the background technology;
Fig. 3 is CSI-RS method of allocating resources schematic diagram in the embodiment of the invention one;
Can carry the schematic diagram of the RE of CSI-RS among the PRB of Fig. 4 for Target cell in the embodiment of the invention one;
Fig. 5 is that another kind is CSI-RS method of allocating resources schematic diagram in the embodiment of the invention one;
Fig. 6 is the method schematic diagram that sends CSI-RS in the embodiment of the invention two;
Fig. 7 (a), Fig. 7 (b) and Fig. 7 (c) are the PRB schematic diagram of three neighbor cells in the embodiment of the invention three;
Fig. 8 (a), Fig. 8 (b) and Fig. 8 (c) are the PRB schematic diagram of three neighbor cells in the embodiment of the invention four;
Fig. 9 (a), Fig. 9 (b) and Fig. 9 (c) are the PRB schematic diagram of three neighbor cells in the embodiment of the invention five;
Figure 10 is the device structure schematic diagram of CSI-RS Resources allocation in the embodiment of the invention six;
Figure 11 is the device structure schematic diagram that sends CSI-RS in the embodiment of the invention seven.
Embodiment
In order to realize the object of the invention, it is CSI-RS Resources allocation and the resource of passing through distribution send scheme from CSI-RS to UE that the embodiment of the invention proposes a kind of, calculate the pilot carrier frequency shift amount of resource on frequency domain among the PRB according to the Cell ID of sub-district, the RE resource of carrying CSI-RS in the LTE-A system is carried out frequency displacement according to the pilot carrier frequency shift amount that calculates again, because the RE resource of carrying CSI-RS adopts identical frequency displacement rule to carry out pilot carrier frequency shift with the resource of carrying UE-Specific Port 5-RS, therefore, effectively avoided because CSI-RS that the RE frequency displacement of carrying UE-Specific Port5-RS causes and the interference between the UE-Specific Port5-RS after the frequency displacement.
Below in conjunction with Figure of description the embodiment of the invention is described in detail.
As shown in Figure 3, for being the CSI-RS method of allocating resources in the embodiment of the invention one, said method comprising the steps of:
Step 101: the RE that in the PRB of Target cell, selects carrying CSI-RS.
In this step, Target cell can be the Serving cell of a certain UE, also can be the cooperation district of this UE, can also be the neighbor cell adjacent with the Serving cell of UE.
As shown in Figure 4, be the schematic diagram of the RE resource that can carry CSI-RS among the PRB of Target cell, as can be seen from Figure 4, the RE among the PRB of Target cell is used to carry following signal:
1, the RE of first three OFDM is used to carry the PDCCH resource;
2, the 1st, 2,5,8,9,12 of PRB the OFDM symbol, wherein part RE is used for carrying the CRS Port0/1/2/3-RS of LTE R8 system;
3, part RE is used for carrying the UE-Specific Port5-RS of LTE R8 system;
4, part RE is used to carry the DM-RS of LTE-A system.
RE among the PRB of Target cell other RE except that being used for above-mentioned 4 kinds of signals can be used to carry CSI-RS.Can from the RE that can carry CSI-RS, select part or all of RE to carry CSI-RS according to the needs of real resource configuration.In the present embodiment, the RE that being used for of selection carried CSI-RS can be the RE of the OFDM at UE-Specific Port5-RS or DM-RS place, and then the RE of Xuan Zeing will avoid the RE at UE-Specific Port5-RS or DM-RS place.
If Target cell is a sub-district in a plurality of neighbor cells, can be that CSI-RS distributes RE according to the mode of step 101 then, and the pattern of the RE of each cell selecting be identical with each sub-district in a plurality of neighbor cells.
Step 102: the pilot carrier frequency shift amount of determining Target cell according to the Cell ID of Target cell.
In this step, can be according to formula
Determine the pilot carrier frequency shift amount of Target cell.
Step 103: the RE of carrying CSI-RS among the Target cell PRB is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtain the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement.
For example the pilot carrier frequency shift amount of Target cell is 1, then compares the subcarrier that moves up on frequency domain before the RE of the carrying CSI-RS after the frequency displacement and the frequency displacement.
Particularly, this step can realize in such a way:
At first, preestablish a benchmark sub-district, the pilot carrier frequency shift amount of this benchmark sub-district can be 0,1 or 2, and the pilot carrier frequency shift amount of supposing the benchmark sub-district in this step is 0.
Then, the pilot carrier frequency shift amount of the pilot carrier frequency shift amount of Target cell and benchmark sub-district is poor, according to the difference that obtains the RE of carrying CSI-RS among the PRB of Target cell is carried out frequency displacement with respect to the benchmark sub-district.
At last, with the RE of carrying CSI-RS among the PRB of RE after of carrying CSI-RS among the PRB that obtains after the frequency displacement as the Target cell frequency displacement.
In this step, because Target cell CSI-RS pattern with the PRB of benchmark sub-district before carrying out frequency displacement is identical, therefore, after calculating the difference of pilot carrier frequency shift amount of the pilot carrier frequency shift amount of Target cell and benchmark sub-district in this step, also can carry out frequency displacement to the RE of carrying CSI-RS among the PRB of Target cell according to difference.
In present embodiment one, scheme by step 101～step 103, RE to carrying CSI-RS carries out frequency displacement according to the pilot carrier frequency shift amount of sub-district, make the RE among the PRB of sub-district be used to as much as possible carry under the situation of CSI-RS, avoided CSI-RS that the frequency displacement of the RE of carrying UE-Specific Port5-RS causes and the interference between the UE-Specific Port5-RS after the frequency displacement.
In the scheme of present embodiment one, except the pilot carrier frequency shift amount of determining according to step 102 is carried out the frequency displacement the RE that carries CSI-RS, can also carry out frequency displacement to the RE that carries UE-SpecificPort5-RS according to the pilot carrier frequency shift amount of determining, as shown in Figure 5, on the basis of step 101～step 103, can further include following steps:
Step 104: the RE of carrying UE-Specific Port5-RS among the PRB of Target cell is carried out frequency displacement according to the pilot carrier frequency shift amount of determining.
Corresponding with step 103, the specific implementation of this step is:
The pilot carrier frequency shift amount of the pilot carrier frequency shift amount of Target cell and benchmark sub-district is poor, according to the difference that obtains the RE of carrying UE-Specific Port5-RS among the PRB of Target cell is carried out frequency displacement with respect to the benchmark sub-district, and with the RE of carrying UE-Specific Port5-RS among the RE of carrying UE-Specific Port5-RS among the PRB that obtains after the frequency displacement PRB after as the Target cell frequency displacement.
In the present embodiment, except the RE that carries UE-Specific Port5-RS need carry out the frequency displacement, other RE such as carrying CRS Port0/1/2/3-RS also need to carry out frequency displacement, but because the RE of carrying CSI-RS may be positioned at same OFDM with the RE of carrying UE-Specific Port5-RS, therefore, the technological means that the RE of carrying UE-Specific Port5-RS carries out frequency displacement has only been described here emphatically.
After in the scheme of the embodiment of the invention one, increasing step 104, can find out more intuitively: the RE of carrying CSI-RS has carried out frequency displacement with the RE of carrying UE-Specific Port5-RS according to identical frequency displacement rule, even after inserting CSI-RS on the OFDM symbol at the UE-Specific Port5-RS place in the PRB of a sub-district, also can effectively avoid because CSI-RS that the UE-Specific Port5-RS frequency displacement of neighbor cell causes and the interference of the UE-Specific Port5-RS after the frequency displacement.
Embodiment two:
The embodiment of the invention two has proposed the method for a kind of CSI-RS of transmission, and as shown in Figure 6, described method comprises:
Step 201: the RE that in the PRB of Target cell, selects carrying CSI-RS.
Step 202: the pilot carrier frequency shift amount of determining Target cell according to the Cell ID of Target cell.
Step 203: the RE of carrying CSI-RS among the Target cell PRB is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtain the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement.
Step 201～step 203 is identical with step 101～step 103 among the embodiment one, after step 203, can also continue to carry out will the RE of carrying UE-Specific Port5-RS carries out frequency displacement according to the pilot carrier frequency shift amount of determining among the PRB of Target cell step.
Step 204: the RE of the carrying CSI-RS of the base station of indicating target sub-district after by the frequency displacement that obtains sends CSI-RS to UE.
The embodiment of the invention two is on the basis of embodiment one, and the base station of Target cell sends CSI-RS by the resource of distributing to CSI-RS to UE.Further, the RE of the carrying UE-Specific Port5-RS of base station that can the indicating target sub-district in step 204 after by frequency displacement sends UE-SpecificPort5-RS to UE.
Because when distributing the RE resource for CSI-RS, RE to carrying CSI-RS has carried out frequency displacement according to the Cell ID of sub-district, therefore, do not disturb mutually between CSI-RS after the frequency displacement and the UE-Specific Port5-RS after the frequency displacement, then can be correctly to UE descending transmission CSI-RS and UE-Specific Port5-RS.
In addition, Target cell may be the Serving cell that receives the UE ownership of CSI-RS, also may be and the neighboring cell of this UE, and according to different situations, the operation of the RE of selection carrying CSI-RS is as follows in the PRB of Target cell:
If Target cell is the Serving cell of UE, then can carry the RE of CSI-RS among the PRB of definite this Target cell, and, from the RE that can carry CSI-RS that determines, select the RE of part or all of RE as carrying CSI-RS according to the pattern of setting (Pattern).
If Target cell is the neighbor cell adjacent with Serving cell, then Target cell is selected the RE of carrying CSI-RS according to the pattern identical with Serving cell (Pattern).Described identical pattern is meant: RE quantity of selecting in the PRB of Target cell and the RE pattern (as the geometric distributions structure) in PRB is identical with RE quantity of selecting in Serving cell and the pattern of RE in PRB.
For the method for embodiment one and embodiment two better is described, the embodiment of the invention three, embodiment four and embodiment five are example with three neighbor cells respectively, describe the scheme of carrying out the CSI-RS resource distribution and sending CSI-RS in detail.
The embodiment of the invention three, embodiment four and embodiment five are that example describes for convenient the description with three neighbor cells, and the present invention is not limited to the situation of three neighbor cells; And, embodiment three, embodiment four and embodiment five only illustrate the position of RE in PRB of carrying CSI-RS, but do not limit logic port (Port) quantity that wherein comprises, do not limit orthogonal multiplex mode or compound mode between the CSI-RS of a plurality of logic ports yet.Embodiment three, embodiment four and embodiment five are used to just illustrate that basic skills, the present invention are not limited to the design of these three CSI-RS.
Embodiment three:
In three neighbor cells of the embodiment of the invention three, sub-district 1 is the Serving cell of UE_A, and sub-district 2 and sub-district 3 are sub-districts adjacent with sub-district 1.In the present embodiment, the RE of the carrying CSI-RS that selects in the PRB of sub-district 1 is the 11st RE among the OFDM.The embodiment of the invention three is not selected the RE among the OFDM at UE-Specific Port5-RS and DM-RS place, but the RE among the 11st OFDM that selects, in the embodiment of the invention three, can be regarded as a kind of new resource allocation and the mode of transmission CSI-RS of proposing, promptly the RE to carrying CSI-RS carries out obtaining distributing to the RE of CSI-RS behind the pilot carrier frequency shift, and the RE that passes through to distribute sends CSI-RS.
Selected 8 RE to be used to carry CSI-RS among the 11st OFDM in the PRB of sub-district 1, the label of these 8 RE is respectively a～h, and the pattern of the RE that selects in sub-district 1 is: 8 RE among the 11st OFDM.According to the pattern of selecting RE in the sub-district 1, in sub-district 2 and sub-district 3, select 8 RE carrying CSI-RS of model identical (Pattern).
Suppose according to formula
Calculate: the pilot carrier frequency shift amount of sub-district 1 is 0, the pilot carrier frequency shift amount of sub-district 2 is 1, the pilot carrier frequency shift amount of sub-district 3 is 2, then the RE of the carrying CSI-RS of three sub-districts, RE and other RE that need carry out frequency displacement of carrying UE-Specific Port5-RS are carried out frequency displacement according to the pilot carrier frequency shift amount of each sub-district respectively, obtain the PRB schematic diagram of three sub-districts after the frequency displacement shown in Fig. 7 (a), Fig. 7 (b) and Fig. 7 (c).And then the RE that the base station of sub-district 1 is used to carry CSI-RS in can the PRB by sub-district 1 sends CSI-RS to UE_A.If sub-district 2 and sub-district 3 are the cooperation district that service is provided to UE simultaneously, then the base station of the base station of sub-district 2 and sub-district 3 RE that is used to carry CSI-RS in can the PRB by sub-district 2 and sub-district 3 sends CSI-RS to UE_A.
Embodiment four:
In three neighbor cells of the embodiment of the invention four, sub-district 1 is the Serving cell of UE_A, and sub-district 2 and sub-district 3 are sub-districts adjacent with sub-district 1.In the present embodiment, the RE of the carrying CSI-RS that selects in the PRB of sub-district 1 is 6 RE among the 4th OFDM at 6 RE among the 11st OFDM and UE-Specific Port5-RS place, the label of 6 RE in the 11st OFDM is " b, d, f, h, j, i ", and the label of 6 RE of CSI-RS is " a, c, e, g, i, k " among the 4th OFDM at UE-Specific Port5-RS place.
The pattern of the RE that CSI-RS selects in sub-district 1 is: 6 RE among 6 RE among the 11st OFDM and the 4th OFDM at UE-Specific Port5-RS place.In sub-district 2 and sub-district 3, select identical pattern, promptly in the sub-district 2 and sub-district 3 select 12 RE carrying CSI-RS of model identical (Pattern).
Suppose according to formula
Calculate: the pilot carrier frequency shift amount of sub-district 1 is 1, the pilot carrier frequency shift amount of sub-district 2 is 2, the pilot carrier frequency shift amount of sub-district 3 is 0, then the RE of the carrying CSI-RS of three sub-districts, RE and other RE that need carry out frequency displacement of carrying UE-Specific Port5-RS are carried out frequency displacement according to the pilot carrier frequency shift amount of each sub-district respectively, obtain the PRB schematic diagram of three sub-districts after the frequency displacement shown in Fig. 8 (a), Fig. 8 (b) and Fig. 8 (c).And then the base station of sub-district 1 can be used to carry the RE of CSI-RS to UE A transmission CSI-RS among the PRB by sub-district 1.If sub-district 2 and sub-district 3 are the cooperation district that service is provided to UE simultaneously, then the base station of the base station of sub-district 2 and sub-district 3 RE that is used to carry CSI-RS in can the PRB by sub-district 2 and sub-district 3 sends CSI-RS to UE_A.
As can be seen from Figure 8,6 RE of the 4th OFDM symbol are used to carry CSI-RS, 3 RE are used to carry UE-Specific Port5-RS, but the RE of carrying CSI-RS has carried out identical frequency displacement with the RE of carrying UE-SpecificPort5-RS, therefore, there are not stronger interference in CSI-RS after the frequency displacement and the UE-Specific Port5-RS after the frequency displacement.
Embodiment five:
In three neighbor cells of the embodiment of the invention five, sub-district 1 is the Serving cell of UE_A, and sub-district 2 and sub-district 3 are sub-districts adjacent with sub-district 1.In the present embodiment, the RE of the carrying CSI-RS that selects in the PRB of sub-district 1 is 2 RE among 2 RE among the 6th OFDM and the 10th OFDM and 2 RE in the 14th OFDM symbol, the label of 2 RE in the 6th OFDM is " a, d ", the label of 2 RE in the 10th OFDM is " b, e ", and the label of 2 RE in the 14th OFDM is " c, f ".
The pattern of the RE that selects in sub-district 1 is: 2 RE among 2 RE among 2 RE among the 6th OFDM, the 10th OFDM and the 14th OFDM.In sub-district 2 and sub-district 3, select identical pattern, promptly in the sub-district 2 and sub-district 3 select 6 RE carrying CSI-RS of model identical (Pattern).
Suppose according to formula
Calculate: the pilot carrier frequency shift amount of sub-district 1 is 0, the pilot carrier frequency shift amount of sub-district 2 is 1, the pilot carrier frequency shift amount of sub-district 3 is 2, then the RE of the carrying CSI-RS of three sub-districts, RE and other RE that need carry out frequency displacement of carrying UE-Specific Port5-RS are carried out frequency displacement according to the pilot carrier frequency shift amount of each sub-district respectively, obtain the PRB schematic diagram of three sub-districts after the frequency displacement as shown in Figure 9, wherein, the RE of carrying DM-RS does not carry out frequency displacement.And then the RE that the base station of sub-district 1 is used to carry CSI-RS in can the PRB by sub-district 1 sends CSI-RS to UE_A.If sub-district 2 and sub-district 3 are the cooperation district that service is provided to UE simultaneously, then the base station of the base station of sub-district 2 and sub-district 3 RE that is used to carry CSI-RS in can the PRB by sub-district 2 and sub-district 3 sends CSI-RS to UE_A.
From Fig. 9 (a), Fig. 9 (b) and Fig. 9 (c) as can be seen, the RE of carrying CSI-RS and the RE that carries UE-Specific Port5-RS have carried out identical frequency displacement among the 10th OFDM, therefore, there are not interference in CSI-RS after the frequency displacement and the UE-Specific Port5-RS after the frequency displacement.
Embodiment six:
The embodiment of the invention six also provides a kind of equipment of CSI-RS Resources allocation that is, as shown in figure 10, described equipment comprises resource selection module 11, frequency shift amount determination module 12 and frequency displacement module 13, and wherein: resource selection module 11 is used for selecting at the Physical Resource Block PRB of Target cell the resource particle RE of carrying CSI-RS; Frequency shift amount determination module 12 is used for determining according to the Cell ID of Target cell the pilot carrier frequency shift amount of Target cell; Frequency displacement module 13 is used for the RE of Target cell PRB carrying CSI-RS is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtains the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement.
It is poor that described frequency displacement module 13 specifically is used for the pilot carrier frequency shift amount of the pilot carrier frequency shift amount of described Target cell and benchmark sub-district, according to the difference that obtains the RE of carrying CSI-RS among the PRB of Target cell is carried out frequency displacement with respect to the benchmark sub-district, and with the RE of carrying CSI-RS among the PRB of RE after as the Target cell frequency displacement of carrying CSI-RS among the PRB that obtains after the frequency displacement.
The RE that described frequency displacement module 13 also is used for dedicated pilot signal UE-Specific Port5-RS that the PRB of Target cell carrying is sent by antenna port 5 carries out frequency displacement according to the pilot carrier frequency shift amount of determining.
It is poor that described frequency displacement module 13 specifically is used for the pilot carrier frequency shift amount of the pilot carrier frequency shift amount of described Target cell and benchmark sub-district, according to the difference that obtains the RE of carrying UE-Specific Port5-RS among the PRB of Target cell is carried out frequency displacement with respect to the benchmark sub-district, and with the RE of carrying UE-Specific Port5-RS among the RE of carrying UE-SpecificPort5-RS among the PRB that obtains after the frequency displacement PRB after as the Target cell frequency displacement.
The embodiment of the invention six is the equipment that belongs under the same inventive concept with embodiment one, can realize each step in embodiment one scheme, six pairs of the embodiment of the invention are for the equipment of CSI-RS Resources allocation has carried out whole description, and the equipment in the present embodiment also is not limited to comprise the logic module that can realize embodiment one scheme.
Embodiment seven:
The embodiment of the invention seven also provides the equipment of a kind of CSI-RS of transmission, as shown in figure 11, described equipment comprises resource selection module 21, frequency shift amount determination module 22, frequency displacement module 23 and indicating module 24, and wherein: resource selection module 21 is used for selecting at the Physical Resource Block PRB of Target cell the resource particle RE of carrying CSI-RS; Frequency shift amount determination module 22 is used for determining according to the Cell ID of Target cell the pilot carrier frequency shift amount of Target cell; Frequency displacement module 23 is used for the RE of Target cell PRB carrying CSI-RS is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtains the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement; The RE of the carrying CSI-RS of the base station that indicating module 24 is used to indicate Target cell after by the frequency displacement that obtains sends CSI-RS to UE.
The RE that described frequency displacement module 23 also is used for dedicated pilot signal UE-Specific Port5-RS that the PRB of Target cell carrying is sent by antenna port 5 carries out frequency displacement according to the pilot carrier frequency shift amount of determining; The RE of the carrying UE-Specific Port5-RS of the base station that described indicating module 24 also is used to indicate Target cell after by the frequency displacement that obtains sends UE-Specific Port5-RS to UE.
Described resource selection module 21 specifically is used for when described Target cell is Serving cell, determine to carry among the PRB of this Target cell the RE of CSI-RS, and according to the pattern of setting, from the RE that can carry CSI-RS that determines, select the RE of part or all of RE as carrying CSI-RS, when described Target cell is the neighbor cell adjacent with Serving cell, according to the RE of the model selection carrying CSI-RS identical with Serving cell, wherein, Serving cell is meant the sub-district of described UE ownership.
The embodiment of the invention seven is the equipment that belongs under the same inventive concept with embodiment two, can realize each step in embodiment two schemes, seven pairs of equipment that send CSI-RS of the embodiment of the invention have carried out whole description, and the equipment in the present embodiment also is not limited to comprise the logic module that can realize embodiment two schemes.
By the method and apparatus that the embodiment of the invention provides, avoided effectively because CSI-RS that the UE-Specific Port5-RS frequency displacement of neighbor cell causes and the interference of the UE-Specific Port5-RS after the frequency displacement; Because the interference between the pilot signal of transmission is less, therefore, can correctly transmit CSI-RS to UE by the resource of distributing.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (17)
1. one kind is channel condition information pilot signal CSI-RS method of allocating resources, it is characterized in that described method comprises:
In the Physical Resource Block PRB of Target cell, select the resource particle RE of carrying CSI-RS;
Determine the pilot carrier frequency shift amount of Target cell according to the Cell ID of Target cell;
The RE of carrying CSI-RS among the Target cell PRB is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtain the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement.
2. the method for claim 1 is characterized in that,
The RE of carrying CSI-RS among the PRB of Target cell is carried out frequency displacement, obtains the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement, comprising:
The pilot carrier frequency shift amount of the pilot carrier frequency shift amount of described Target cell and benchmark sub-district is poor, according to the difference that obtains the RE of carrying CSI-RS among the PRB of Target cell is carried out frequency displacement with respect to the benchmark sub-district, and with the RE of carrying CSI-RS among the PRB of RE after as the Target cell frequency displacement of carrying CSI-RS among the PRB that obtains after the frequency displacement.
3. method as claimed in claim 1 or 2 is characterized in that, determines that described method also comprises after the pilot carrier frequency shift amount of Target cell:
The RE that carries the dedicated pilot signal UE-Specific Port5-RS that sends by antenna port 5 among the PRB of Target cell is carried out frequency displacement according to the pilot carrier frequency shift amount of determining.
4. method as claimed in claim 3 is characterized in that,
The RE of carrying UE-Specific Port5-RS among the PRB of Target cell is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, comprising:
The pilot carrier frequency shift amount of the pilot carrier frequency shift amount of described Target cell and benchmark sub-district is poor, according to the difference that obtains the RE of carrying UE-Specific Port5-RS among the PRB of Target cell is carried out frequency displacement with respect to the benchmark sub-district, and with the RE of carrying UE-Specific Port5-RS among the RE of carrying UE-Specific Port5-RS among the PRB that obtains after the frequency displacement PRB after as the Target cell frequency displacement.
5. as claim 2 or 4 described methods, it is characterized in that the pilot carrier frequency shift amount of described benchmark sub-district is 0,1 or 2.
6. the method for a transmitting channel state information pilot signal CSI-RS is characterized in that described method comprises:
In the Physical Resource Block PRB of Target cell, select the resource particle RE of carrying CSI-RS;
Determine the pilot carrier frequency shift amount of Target cell according to the Cell ID of Target cell;
The RE of carrying CSI-RS among the Target cell PRB is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtain the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement;
The RE of the carrying CSI-RS of the base station of indicating target sub-district after by the frequency displacement that obtains sends CSI-RS to UE.
7. method as claimed in claim 6 is characterized in that, determines that described method also comprises after the pilot carrier frequency shift amount of Target cell:
The RE that carries the dedicated pilot signal UE-Specific Port5-RS that sends by antenna port 5 among the PRB of Target cell is carried out frequency displacement according to the pilot carrier frequency shift amount of determining;
The RE of the carrying UE-Specific Port5-RS of the base station of indicating target sub-district after by the frequency displacement that obtains sends UE-Specific Port5-RS to UE.
8. method as claimed in claim 6 is characterized in that, selects the RE of carrying CSI-RS in the PRB of Target cell, comprising:
When described Target cell is Serving cell, determines to carry among the PRB of this Target cell the RE of CSI-RS, and, from the RE that can carry CSI-RS that determines, select the RE of part or all of RE as carrying CSI-RS according to the pattern of setting;
When described Target cell is the neighbor cell adjacent with Serving cell, in the PRB of Target cell, select the RE of carrying CSI-RS according to the pattern identical with Serving cell;
Wherein, Serving cell is meant the sub-district of described UE ownership.
9. method as claimed in claim 8, it is characterized in that the RE that carries CSI-RS according to the model selection identical with Serving cell is meant: RE quantity of selecting and the pattern of RE are identical with RE quantity and the pattern of RE in PRB selected in Serving cell in the PRB of Target cell.
10. method as claimed in claim 8 is characterized in that, the RE that can carry CSI-RS among the PRB comprises the RE except that the RE of the following content of carrying among the PRB:
RE on all OFDM symbols of carrying physical downlink control channel PDCCH resource;
Carry in the LTE R8 system by the RE on all OFDM symbols of antenna port 0,1,2 or the 3 common pilot signal CRSPort0/1/2/3-RS that send;
The RE of the dedicated pilot signal UE-SpecificPort5-RS that sends by antenna port 5 in the carrying LTE R8 system;
The RE of the demodulated pilot signal DM-RS of carrying LTE-A system.
11. one kind is the equipment of channel condition information pilot signal CSI-RS Resources allocation, it is characterized in that described equipment comprises:
The resource selection module is used for the resource particle RE at the Physical Resource Block PRB of Target cell selection carrying CSI-RS;
The frequency shift amount determination module is used for determining according to the Cell ID of Target cell the pilot carrier frequency shift amount of Target cell;
The frequency displacement module is used for the RE of Target cell PRB carrying CSI-RS is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtains the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement.
12. equipment as claimed in claim 11 is characterized in that,
Described frequency displacement module, it is poor specifically to be used for the pilot carrier frequency shift amount of the pilot carrier frequency shift amount of described Target cell and benchmark sub-district, according to the difference that obtains the RE of carrying CSI-RS among the PRB of Target cell is carried out frequency displacement with respect to the benchmark sub-district, and with the RE of carrying CSI-RS among the PRB of RE after as the Target cell frequency displacement of carrying CSI-RS among the PRB that obtains after the frequency displacement.
13. as claim 11 or 12 described equipment, it is characterized in that,
Described frequency displacement module, the RE that also is used for dedicated pilot signal UE-Specific Port5-RS that the PRB of Target cell carrying is sent by antenna port 5 carries out frequency displacement according to the pilot carrier frequency shift amount of determining.
14. equipment as claimed in claim 13 is characterized in that,
Described frequency displacement module, it is poor specifically to be used for the pilot carrier frequency shift amount of the pilot carrier frequency shift amount of described Target cell and benchmark sub-district, according to the difference that obtains the RE of carrying UE-Specific Port5-RS among the PRB of Target cell is carried out frequency displacement with respect to the benchmark sub-district, and with the RE of carrying UE-Specific Port5-RS among the RE of carrying UE-SpecificPort5-RS among the PRB that obtains after the frequency displacement PRB after as the Target cell frequency displacement.
15. the equipment of a transmitting channel state information pilot signal CSI-RS is characterized in that described equipment comprises:
The resource selection module is used for the resource particle RE at the Physical Resource Block PRB of Target cell selection carrying CSI-RS;
The frequency shift amount determination module is used for determining according to the Cell ID of Target cell the pilot carrier frequency shift amount of Target cell;
The frequency displacement module is used for the RE of Target cell PRB carrying CSI-RS is carried out frequency displacement according to the pilot carrier frequency shift amount of determining, obtains the RE of carrying CSI-RS among the PRB of Target cell after the frequency displacement;
The RE of indicating module, the base station that is used to the to indicate Target cell carrying CSI-RS after by the frequency displacement that obtains sends CSI-RS to UE.
16. equipment as claimed in claim 15 is characterized in that,
Described frequency displacement module, the RE that also is used for dedicated pilot signal UE-Specific Port5-RS that the PRB of Target cell carrying is sent by antenna port 5 carries out frequency displacement according to the pilot carrier frequency shift amount of determining;
The RE of described indicating module, the base station that also is used to the to indicate Target cell carrying UE-Specific Port5-RS after by the frequency displacement that obtains sends UE-Specific Port5-RS to UE.
17. equipment as claimed in claim 15 is characterized in that,
Described resource selection module, specifically be used for when described Target cell is Serving cell, determine to carry among the PRB of this Target cell the RE of CSI-RS, and according to the pattern of setting, from the RE that can carry CSI-RS that determines, select the RE of part or all of RE, when described Target cell is the neighbor cell adjacent with Serving cell, according to the RE of the model selection carrying CSI-RS identical with Serving cell as carrying CSI-RS, wherein, Serving cell is meant the sub-district of described UE ownership.
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