CN101841354A - Method and device for transmitting downlink measurement pilot frequency - Google Patents
Method and device for transmitting downlink measurement pilot frequency Download PDFInfo
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Abstract
The invention discloses a method for transmitting downlink measurement pilot frequency. The method comprises the following steps of: selecting a part of downlink sub-frames from a wireless frame to carry the downlink measurement pilot frequency according to the distribution condition of system resources; selecting an OFDM symbol in each selected downlink sub-frame; selecting a part of subcarriers on the selected OFDM symbol as resource elements for carrying the downlink measurement pilot frequency; and carrying the downlink measurement pilot frequency on the resource elements for carrying the downlink measurement pilot frequency and transmitting the downlink measurement pilot frequency to user equipment UE. The invention also discloses a device for transmitting the downlink measurement pilot frequency. Due to the application of the method and the device, the downlink measurement pilot frequency can be transmitted by utilizing the conventional time frequency resources.
Description
Technical field
The present invention relates to the pilot transmission technology, particularly a kind of downlink measurement pilot frequency transmission method and device.
Background technology
(LTE is the abbreviation of Long Term Evolution at 3GPP Long Term Evolution LTE-Advanced, it is the evolution system of 3-G (Generation Three mobile communication system), the LTE-Advanced system is the upgrading of LTE system) in the system, will adopt high-order mimo technology and multi-cell synergetic transmission innovation technology to improve systematic function.The high-order mimo technology is all to dispose nearly 8 antennas at transmitting terminal and receiving terminal, is increased in spatial parallelism data flow transmitted number, improves the average throughput of system.The multi-point cooperative transmission technology improves user's received signal quality by the combined dispatching or the collaborative transmission of a plurality of sub-districts of separating on the geographical position, reduces the interference of minizone, thereby effectively improves power system capacity and edge customer spectrum efficiency.
In wireless communication system, the base station need send downlink measurement pilot frequency (CQI-RS) to UE, and UE detects and do channel estimating after receiving downlink measurement pilot frequency, thereby obtains to measure relevant information, as PMI/CQI/RI etc.
There are 4 antenna ports in existing LTE system, so the downlink measurement pilot frequency of 4 antenna ports need be transmitted in this LTE system.But LTE-A system high-order mimo is supported 8 antenna ports, has increased by 4 antenna ports than existing LTE system, therefore needs to increase the downlink measurement pilot frequency expense of 4 antenna ports.The 56th meeting of 3GPP RAN1 determined that the high level MIMO system data demodulates adopts the user-specific pilot tone, only launches in the user data Resource Block; Measure and adopt the exclusive sparse pilot tone in sub-district, the configuration of these pilot tones should be the influence of as far as possible avoiding LTE R8 user.
In the multi-point cooperative transmission technology, UE need estimate the channel of a plurality of sub-districts.There is frequency shift in setting according to present LTE system descending public guide frequency between the adjacent cell common pilots, can avoid interference mutual between the pilot tone, yet the interference between data and the pilot tone is still inevitable.Be the precision that guarantees that CQI/PMI/RI estimates, the multi-point cooperative transmission technology also need increase new pilot tone.
Therefore, need be in the LTE-Advanced system, newly-increased downlink measurement pilot frequency.
Summary of the invention
In view of this, the invention provides a kind of downlink measurement pilot frequency transmission method, can utilize existing running time-frequency resource, the downlink measurement pilot frequency of the newly-increased antenna port of transmission.
For achieving the above object, the present invention adopts following technical scheme:
A kind of downlink measurement pilot frequency transmission method comprises:
A, according to the allocation situation of system resource, in a radio frames, select the part descending sub frame to carry described downlink measurement pilot frequency, in each descending sub frame of selecting, select an OFDM symbol, and selection portion is divided subcarrier on selected OFDM symbol, as the resource element that is used to carry described downlink measurement pilot frequency;
B, described downlink measurement pilot frequency is carried on the resource element that is used to carry described downlink measurement pilot frequency, is handed down to UE.
Preferably, OFDM symbol of described selection is: according to the allocation situation of system resource, and the OFDM symbol of other channel collision probability minimums in selection and this sub-district.
Preferably, when the long CP of the CP of system sampling, the OFDM symbol of selection is the 6th an OFDM symbol of even time slot in the determined descending sub frame.
Preferably, on selected OFDM symbol, every interval M subcarrier selects a subcarrier or one group as the described resource element that is used for the bearing downlink measurement pilot frequency, and M is default positive integer.
Preferably, according to the expense of certainty of measurement and downlink measurement pilot frequency, determine the number of the descending sub frame of the described downlink measurement pilot frequency of carrying.
Preferably, when there was discontinuous transmission DTX dormancy period in described system, described N was 2
n, n is a natural number.
Preferably, described downlink measurement pilot frequency is carried on the resource element that is used for the bearing downlink measurement pilot frequency is:
Described downlink measurement pilot frequency is superimposed upon on the user data, is carried on the described resource element that is used for the bearing downlink measurement pilot frequency;
Perhaps, remain for the resource element of bearing downlink measurement pilot frequency in advance, only carry described downlink measurement pilot frequency;
Perhaps, at the resource element place that is used for the bearing downlink measurement pilot frequency,, utilize this resource element only to carry described downlink measurement pilot frequency to the user data processing of punching.
Preferably, when the downlink measurement pilot frequency of needs transmission is the downlink measurement pilot frequency of a plurality of different ports, according to the multiplex mode of different port downlink measurement pilot frequency, the downlink measurement pilot frequency of each port of determining is carried on the resource element that is used for the bearing downlink measurement pilot frequency.
Preferably, described multiplex mode is a code division multiplexing;
The mode of determining the described downlink measurement pilot frequency of each port is:
Utilize default orthogonal sequence as described downlink measurement pilot frequency; The out of phase rotation of the corresponding described orthogonal sequence of the downlink measurement pilot frequency of different port;
Described downlink measurement pilot frequency is carried on the resource element that is used to carry described downlink measurement pilot frequency is: the downlink measurement pilot frequency of different port is carried on identical resource element.
Preferably, according to sub-district ID, be used for the subframe numbers timeslot number of bearing downlink measurement pilot frequency, high-level signaling and bandwidth generate described orthogonal sequence.
Preferably, as downlink measurement pilot frequency, the phase place of the corresponding ZC sequence of the downlink measurement pilot frequency of different port rotates to be with the ZC sequence
n
CQI-RS=0...N, wherein, n
CQI-RSBe port index, N is the port sum.
Preferably, described multiplex mode is the part code division multiplexing;
The mode of determining the described downlink measurement pilot frequency of each port is: with the different port grouping, the downlink measurement pilot frequency of port adopts different orthogonal sequences on the same group in advance;
Described downlink measurement pilot frequency is carried on the resource element that is used to carry described downlink measurement pilot frequency is: the downlink measurement pilot frequency of port is not carried on different resource elements on the same group;
After described downlink measurement pilot frequency being carried on the resource element that is used for the bearing downlink measurement pilot frequency, this method further comprises: generate scrambler according to sub-district ID, subframe numbers and timeslot number, to described downlink measurement pilot frequency scrambling.
Preferably, described multiplex mode is the frequency division multiplexing mode;
The mode of determining the described downlink measurement pilot frequency of each port is: each port adopts identical sequence as downlink measurement pilot frequency;
Described downlink measurement pilot frequency is carried on the resource element that is used to carry described downlink measurement pilot frequency is: the downlink measurement pilot frequency of different port is carried on different described resource elements;
After described downlink measurement pilot frequency being carried on the resource element that is used for the bearing downlink measurement pilot frequency, this method further comprises: according to sub-district ID, subframe numbers, and timeslot number, system bandwidth generates scrambler, to described downlink measurement pilot frequency scrambling.
Preferably, further comprise between step a and step b: the descending sub frame and the resource element information of the described downlink measurement pilot frequency of carrying definite among the step a are kept among base station and the UE.
Preferably, in system's running, carry out described step a according to the real-time allocation situation of system resource; And further comprise between step a and step b: the descending sub frame and the resource element information of the described downlink measurement pilot frequency of determining in step a of carrying are handed down to UE by high-level signaling.
A kind of downlink measurement pilot frequency transmitting device comprises:
The downlink measurement pilot frequency position determination unit, be used for allocation situation according to system resource, in a radio frames, select the part descending sub frame to carry described downlink measurement pilot frequency, in each descending sub frame of selecting, select an OFDM symbol, and selection portion is divided subcarrier on selected OFDM symbol, as the resource element that is used to carry described downlink measurement pilot frequency;
Data form and transmitting element, are used for the multiplex mode according to the described downlink measurement pilot frequency of each port, and the described downlink measurement pilot frequency of each port of determining is carried on the resource element that is used to carry described downlink measurement pilot frequency, are handed down to UE.
As seen from the above technical solution, among the present invention, at first according to the allocation situation of system resource, in a radio frames, select the part descending sub frame to carry described downlink measurement pilot frequency, in each descending sub frame of selecting, select an OFDM symbol, and selection portion is divided subcarrier on selected OFDM symbol, as the resource element that is used to carry described downlink measurement pilot frequency.Then,, the downlink measurement pilot frequency of each port of determining is carried on the resource element (RE) that is used for the bearing downlink measurement pilot frequency, is handed down to UE according to the multiplex mode of the described downlink measurement pilot frequency of each port.By the way, can be used to transmit newly-increased downlink measurement pilot frequency.
Description of drawings
Fig. 1 is the basic flow sheet of CQI-RS transmission method among the present invention.
Fig. 2 is for being reference with LTE-A system subframe, the example of a bearing downlink measurement pilot frequency that provides.
Fig. 3 (a) and Fig. 3 (b) are the schematic diagram of downlink measurement pilot frequency pattern among the present invention.
Fig. 4 is the schematic diagram of downlink measurement pilot frequency pattern in the embodiment of the invention one.
Fig. 5 is the schematic diagram of downlink measurement pilot frequency pattern in the embodiment of the invention two.
Fig. 6 is the schematic diagram of downlink measurement pilot frequency pattern in the embodiment of the invention three.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, the present invention is described in further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: system is base station configuration CQI-RS, and notice UE, wherein, CQI-RS sparsely is distributed on the OFDM symbol in certain subframe, and avoids collision with other channels as far as possible.Thereby avoid on the one hand the influence of CQI-RS transmission as far as possible, on the other hand, can guarantee the accuracy of the metrical information obtained the R8 user data.
Fig. 1 is the basic flow sheet of CQI-RS transmission method among the present invention, and as shown in Figure 1, this method comprises:
Consider the transport overhead of measurement pilot frequency, when carrying out the CQI-RS transmission, need in all descending sub frames, all not carry CQI-RS usually, in the part descending sub frame, transmit getting final product.
Particularly, the descending sub frame that is used to carry CQI-RS can be selected arbitrarily, below evenly is distributed as example with the descending sub frame of carrying CQI-RS and describes.Wherein, the descending sub frame of each selection each other can N the subframe in interval.Wherein, the value of N is big more, and then the expense of CQI-RS is more little, and PMI/CQI/RI etc. measure corresponding can the reduction of accuracy of measurement of relevant information; The value of N is more little, and the accuracy of measurement of measurement such as PMI/CQI/RI relevant information can be high more, but the expense of CQI-RS is also just big more.Therefore, can be according to system for the accuracy of measurement requirement of measurement relevant informations such as PMI/CQI/RI and the factor of CQI-RS expense two aspects, the compromise concrete value of determining N.For example, can get N is 5 or 10 subframes.Fig. 2 is for being reference with LTE-A system subframe, the example of a bearing downlink measurement pilot frequency that provides.Wherein, CQI-RS is carried on subframe # 1 and the subframe # 6.
For the LTE-A system,, then can also will be set to 2 between the descending sub frame of carrying CQI-RS if there is noncontinuity transmission (DTX) dormancy period
n, promptly identical with the DTX dormancy period, to save system resource.
In this step, on each descending sub frame of determining, for CQI-RS determines concrete carrying RE.Particularly, at first select an OFDM symbol, again measurement pilot frequency sparsely is distributed on this OFDM symbol.
In each descending sub frame of determining, CQI-RS is carried on the same OFDM symbol among the present invention.Than CQI-RS is disperseed to be carried on the different OFDM symbols, this bearing mode among the present invention can reduce the collision probability with other channels as far as possible, thereby avoids the interference to R8 user on the one hand, guarantees the reliability of self transmission on the other hand.Wherein, when selecting the OFDM symbol of carrying CQI-RS, need determine, avoid the collision with other channels as far as possible according to the allocation situation of system resource, preferably, can select with this sub-district in the OFDM symbol of other channel collision probability minimums.For example, Fig. 3 is an example with a pair of PRB, in adopting the LTE-A system of long CP, for fear of with PDCCH, PBCH, PSCH/SSCH, DRS, the conflict of CRS (R0-R3), CQI-RS is placed on the 6th symbol of even time slot.
Be the condition that need satisfy for measurement pilot frequency in the high level MIMO system that guarantees to propose in the 56th meeting of 3GPP RAN1, on aforementioned selected OFDM symbol, CQI-RS needs sparsely to distribute.Wherein, CQI-RS can sparse, at random be distributed on the OFDM symbol of this selection.Below describe with the sparse example that is distributed as equably of CQI-RS.Particularly, CQI-RS can be spaced apart, and is also can part spaced apart shown in Fig. 3 (a), shown in Fig. 3 (b).Wherein, spaced apart being meant, on selected OFDM symbol, every interval M subcarrier selects a subcarrier as the RE that is used to carry CQI-RS; Part is spaced apart to be meant, on selected OFDM symbol, every interval M subcarrier selects one group of subcarrier (2 subcarriers are as one group of subcarrier among Fig. 3 (b)) as the RE that is used to carry CQI-RS.Identical with the value of determining N in the abovementioned steps 101, for the selection of introns carrier number M, also need to require and the expense two aspect factors of CQI-RS according to the accuracy of measurement that relevant information is measured for PMI/CQI/RI etc. by system, compromise definite.
In the process of determining RE, can in the full bandwidth scope, determine, also can only in the part bandwidth, determine.For the LTE-A system, RE that can be definite according to this step to the carrying of corresponding each subcarrier separate configurations to CQI-RS, also can unify pairing all subcarriers of RE to determining one by one, and unified configuration is for the carrying of CQI-RS.
Step 103 is carried on CQI-RS on the definite RE of step 102, is handed down to UE.
The mode that the CQI-RS of each port of determining is carried on the RE can be in following three kinds any one:
1) RE that determines in the step 102 still can be used for carrying user data, when carrying CQI-RS, this CQI-RS is superimposed upon on the user data, together is carried on this RE; This bearing mode may produce user data and disturb;
2) RE that determines in the step 102 is reserved out, only be used to carry CQI-RS; This bearing mode does not have influence for user data;
3) the RE that determines in the step 102 is not reserved out, but user data is punched in definite RE position in step 102, utilizes this RE position only to carry CQI-RS.
In the present invention, CQI-RS to a plurality of ports transmits if desired, for example, in the LTE-A system, be 4 antenna port transmission CQI-RS that increase, then this step need further comprise before CQI-RS is carried on RE: concrete form and the multiplex mode of determining the CQI-RS of each port.
Wherein, the mode of distinguishing the CQI-RS of each port can have multiple, for example code division multiplexing (CDM) mode, portion C DM mode or frequency division multiplexing (FDM) mode etc.Under different modes, determine that specifically the mode of each port CQI-RS is also different, concrete mode will describe by the embodiment of back.
For different multiplex modes, difference may also be arranged for the selection of aforementioned 3 kinds of bearing modes.For the 1st) plant bearing mode, when being superimposed upon CQI-RS on the user data, disturb owing to may form to the transmission of user data, therefore, preferably, when the measurement pilot frequency of different port adopts CDM multiplex mode or portion C DM multiplex mode, can select this bearing mode; And when the measurement pilot frequency of different port adopted CDM multiplex mode or portion C DM multiplex mode, this bearing mode may cause the decline of user data receptivity, did not therefore recommend this bearing mode.
After on CQI-RS being carried on the RE that determines in the step 102, promptly can send to UE.So far, the basic procedure of downlink measurement pilot frequency transmission method of the present invention finishes.
UE detects and does channel estimating to it after receiving CQI-RS, finally obtains to measure relevant information, as PMI/CQI/RI etc.
In above-mentioned CQI-RS transmission method flow process, the concrete operations that are identified for carrying the descending sub frame of CQI-RS and RE in step 101～102 can be that the configuration state according to system resource sets in advance, and perhaps, determine in real time in system's running.When this descending sub frame and RE are when setting in advance, then can in advance concrete setting be kept among the UE; When this descending sub frame and RE are when determining in real time, then can concrete setting give UE, thereby make UE behind reception CQI-RS by the high-level signaling real time down, can correctly detect and carry out channel estimating.
Below by the specific embodiment explanation, when the downlink transfer pilot tone of a plurality of different ports of transmission, the multiplex mode of three kinds of different port pilot tones among the present invention.
Embodiment one:
In the present embodiment, the CQI-RS of different port adopts the CDM multiplex mode.Under this multiplex mode, adopt the less sequence of orthogonal sequence or correlation as CQI-RS, the generation of this sequence need be finished according to sub-district ID, subframe numbers and timeslot number, on the one hand, make different sub-districts generate different CQI-RS, on the other hand, guarantee interference randomization.Simultaneously, on the same position, same sub-district, the out of phase rotation of the corresponding sequence of the CQI-RS of different port, thus distinguish different port.
Wherein, can select arbitrarily, as long as satisfy above-mentioned condition as the sequence of CQI-RS.The ZC sequence promptly is to satisfy the sequence of above-mentioned condition, and the LTE system upstream reference signal adopts is exactly the ZC sequence, so in the present embodiment, is that example describes with the ZC sequence.The idiographic flow of concrete present embodiment CQI-RS transmission method comprises:
Step 201～202, the descending sub frame of definite carrying CQI-RS is selected an OFDM symbol in the descending sub frame of determining, and selection portion is divided subcarrier on selected OFDM symbol, as the RE that is used to carry CQI-RS.
Here the operation of step 201～202 is identical with the operation of abovementioned steps 101～102, just repeats no more here.With a pair of PRB is example, and the RE schematic diagram that above-mentioned steps is determined as shown in Figure 4.Wherein, adopt under the long CP, select the 6th OFDM symbols carry CQI-RS of even time slot, and, 2 RE in space between the RE of carrying CQI-RS.
Step 203 generates the ZC sequence according to sub-district ID, system bandwidth, subframe numbers, timeslot number and high-level signaling etc., and distinguishes different port by different phase place rotations.
As previously mentioned, the ZC sequence here refers to the sequence that the LTE system upstream reference signal adopts.The ZC sequence can be according to sub-district ID, system bandwidth, and subframe numbers, timeslot number, parameters such as high-level signaling generate, and different ZC sequences is adopted in different sub-districts.
The same locational different port CQI-RS in same sub-district distinguishes in the phase place rotation (cyclic shift of time domain) of frequency domain by the ZC sequence, promptly
n
CQI-RS=0...N-1, wherein, n
CQI-RSBe port index, N carries out the port sum of CQI-RS transmission for adopting the present embodiment method.
Utilize this step promptly can determine the CQI-RS of each port correspondence.
Step 204 is carried on the CQI-RS that determines in the step 203 on the definite RE of step 202, is handed down to UE.
Because what present embodiment adopted is the CDM multiplex mode, so the CQI-RS of different port has distinguished by the operation in the step 203.In this step, the CQI-RS of different port is carried on the identical RE, promptly all is carried on the definite RE of step 202, is handed down to UE then.Wherein, identical in the concrete bearing mode of CQI-RS on RE and the abovementioned steps 103, just repeat no more here.
Embodiment two:
In the present embodiment, the CQI-RS of different port adopts portion C DM multiplex mode.Under this multiplex mode, all ports that adopt the present embodiment method to carry out the CQI-RS transmission are divided into groups, the CQI-RS of inner port adopts the code division multiplexing mode on the same group, promptly selects the CQI-RS of the different orthogonal sequence of mutually orthogonal as different port; Not on the same group between the CQI-RS of port adopt the frequency division multiplexing mode, promptly do not adopt different RE to carry on the same group.Then, again CQI-RS is carried out scrambling, employed scrambler need generate according to sub-district ID, subframe numbers and timeslot number in the scrambling process, on the one hand, makes different sub-districts generate different CQI-RS, on the other hand, guarantees interference randomization.
Wherein, can select arbitrarily as the orthogonal sequence of CQI-RS.Be that example describes with the Walsh sequence in the present embodiment.The idiographic flow of concrete present embodiment CQI-RS transmission method comprises:
Step 301～302, the descending sub frame of definite carrying CQI-RS is selected an OFDM symbol in the descending sub frame of determining, and selection portion is divided subcarrier equably on selected OFDM symbol, as the RE that is used to carry CQI-RS.
Here the operation of step 301～302 is identical with the operation of abovementioned steps 101～102, just repeats no more here.With a pair of PRB is example, as shown in Figure 5, wherein, adopts under the long CP, selects the 6th OFDM symbols carry CQI-RS of even time slot.
Step 303 is evenly divided into groups each port, and the sequence that the group inner port adopts quadrature each other is as CQI-RS, and with mutual differentiation, port on the same group adopts one group of identical orthogonal sequence; Port does not on the same group adopt different carrying RE, with mutual differentiation.
In this step, each port is evenly divided into groups;
With newly-increased 4 antenna port R4～R7 in the LTE-A system is example, 4 ports is divided into two groups, one group of R4 and R5, one group of R6 and R7.
The group inner port adopts the sequence of quadrature each other as CQI-RS, with mutual differentiation;
As shown in Figure 5, R4 and R5 take adjacent RE (for guaranteeing mutual orthogonality, being used to carry on the same group, the RE of port CQI-RS is generally adjacent), and adopt Walsh sequence [11] and [1-1] conduct CQI-RS separately respectively, obviously, these two sequences are mutually orthogonal.
Port does not on the same group adopt one group of identical orthogonal sequence;
As shown in Figure 5, R6 and R7 also adopt Walsh sequence [11] and [1-1] conduct CQI-RS separately respectively, adopt one group of identical orthogonal sequence with R4 and R5.
Port does not on the same group adopt different carrying RE, with mutual differentiation;
At all RE that are used for carrying CQI-RS, for not on the same group port select corresponding RE, be used to carry the CQI-RS of this group port.As shown in Figure 5, with the 1st, 2,7,8 subcarrier of the 6th OFDM symbol RE, be used to carry the CQI-RS of R4 and R5 as R4 and R5 correspondence; With the 4th, 5,10,11 subcarrier of the 6th OFDM symbol RE, be used to carry the CQI-RS of R6 and R7 as R6 and R7 correspondence.
By this step as seen, about the selection of parton carrier wave, belong to the situation of ", selecting one group of subcarrier " on the OFDM symbol shown in Figure 5 as the RE that is used to carry CQI-RS every M subcarrier.Particularly, every 1 subcarrier, select the RE of two subcarriers as two port CQI-RS of carrying.
Step 304 is carried on the CQI-RS of each port correspondence on the corresponding RE, and determines scrambler according to sub-district ID, subframe numbers and timeslot number, is the CQI-RS scrambling, is handed down to UE again.
In this step, CQI-RS is carried on mode on the corresponding RE,, just repeats no more here with identical in the abovementioned steps 103.
CQI-RS is being carried on the corresponding RE, is being difference sub-district and interference randomization, this step further comprises: determine scrambler according to sub-district ID, subframe numbers and timeslot number, and utilize this scrambler of determining to be the CQI-RS scrambling.Certainly, this scrambler can also further generate according to parameters such as system bandwidth, high-level signalings except that determining according to above-mentioned parameter.If the scrambler that adopts is identical with the scrambler of user data, then the scrambling of this step operation can together be carried out with the scrambling of user data.
So far, the CQI-RS transmission method flow process in the present embodiment finishes.
Embodiment three:
In the present embodiment, the CQI-RS of different port adopts the FDM multiplex mode.Under this multiplex mode, adopt all of the port to adopt identical orthogonal sequence as CQI-RS, the CQI-RS of different port is carried on the different subcarriers, to realize frequency division multiplexing.Then, again CQI-RS is carried out scrambling, employed scrambler need generate according to sub-district ID, subframe numbers and timeslot number in the scrambling process, on the one hand, makes different sub-districts generate different CQI-RS, on the other hand, guarantees interference randomization.
The idiographic flow of concrete present embodiment CQI-RS transmission method comprises:
Step 401, the descending sub frame of definite carrying CQI-RS.
Here the operation of step 401 is identical with the operation of abovementioned steps 101, just repeats no more here.
Step 402 is selected an OFDM symbol in the descending sub frame of determining, selection portion is divided subcarrier on selected OFDM symbol, as the RE that is used to carry CQI-RS, and at all RE that are used for carrying CQI-RS, for each port is selected corresponding RE.
In this step, identical in the mode of selecting OFDM symbol and parton carrier wave and the abovementioned steps 102, just repeat no more here.Because present embodiment adopts the frequency division multiplexing mode, therefore, after being identified for carrying the RE of CQI-RS, need further the RE that determines to be distributed to each different port, be used to carry the CQI-RS of this port.
Wherein, the concrete method of salary distribution can be arbitrarily, and preferably, for arbitrary port, the CQI-RS of this port is equally distributed.And the shared number of sub carrier wave of each port is identical.
With a pair of PRB is example, and the RE schematic diagram that above-mentioned steps is determined as shown in Figure 6.Wherein, adopt under the long CP, select the 6th OFDM symbols carry CQI-RS of even time slot, and, on this OFDM symbol,, select the RE of 4 subcarriers as 4 port CQI-RS of carrying every 1 subcarrier.For example, the 2nd～4 subcarrier of this OFDM symbol is respectively applied for the (CQI-RS of R4～R7) of newly-increased 4 antenna ports in the carrying LTE-A system.
Step 403 according to the frequency division multiplexing mode, is carried on default pilot frequency sequence on the RE that determines in the step 402.
In this step, each port adopts identical pilot frequency sequence, as previously mentioned, carries the RE difference of each different port pilot frequency sequence.Here, on the RE of each port correspondence, carry the CQI-RS of this port.Identical in concrete bearing mode and the abovementioned steps 103, just repeat no more here.
Step 404 is determined scrambler according to sub-district ID, subframe numbers and timeslot number, is the CQI-RS scrambling, and is handed down to UE.
Be difference sub-district and interference randomization, this step is determined scrambler according to sub-district ID, subframe numbers and timeslot number, and utilizes this scrambler of determining to be the CQI-RS scrambling.Certainly, this scrambler can also further generate according to parameters such as system bandwidth, high-level signalings except that determining according to above-mentioned parameter.If the scrambler that adopts is identical with the scrambler of user data, then the scrambling of this step operation can together be carried out with the scrambling of user data.
So far, the CQI-RS transmission method flow process in the present embodiment finishes.
The above-mentioned specific implementation that is CQI-RS transmission method among the present invention.The present invention also provides a kind of CQI-RS transmitting device, and this device comprises:
The downlink measurement pilot frequency position determination unit, be used for allocation situation according to system resource, in radio frames, select the part descending sub frame to carry described downlink measurement pilot frequency, in each descending sub frame of selecting, select an OFDM symbol, and selection portion is divided subcarrier on selected OFDM symbol, as the resource element that is used to carry described downlink measurement pilot frequency;
Data form and transmitting element, are used for the multiplex mode according to the described downlink measurement pilot frequency of each port, and the described downlink measurement pilot frequency of each port of determining is carried on the resource element that is used to carry described downlink measurement pilot frequency, are handed down to UE.
By the specific implementation of the invention described above as seen, among the present invention, CQI-RS is sparse to be evenly distributed on certain OFDM symbol of certain descending sub frame, on the time domain at interval M subframe (M desirable 2/5/2
nDeng).N (N gets 1/2/5 usually) individual subcarrier or placement at interval not exclusively at interval on the frequency domain, as shown in Figure 2.The measurement pilot frequency of different port adopts CDM multiplexing or portion C DM multiplex mode or FDM multiplex mode.
When adopting CDM multiplexing, CQI-RS can adopt the ZC sequence, and the same locational measurement pilot frequency in same sub-district adopts identical sequence, and different port is distinguished by the phase place rotation (cyclic shift of time domain) of frequency domain, the minizone is distinguished by different sequences, and makes interference randomization.
When adopting portion C DM multiplexing, CQI-RS can adopt orthogonal sequence+scrambler, as walsh sequence+scrambler.Different port is distinguished by orthogonal sequence, and different districts is distinguished by scrambler, and makes interference randomization.
By the invention described above, promptly can realize a kind of configuration mode of new downlink measurement pilot frequency.This mode can be applied in the LTE-A system, and 4 antenna port transmission CQI-RS to newly-increased certainly, also can be applied in other various systems, and the port number that is suitable for also is not limited to 4.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. a downlink measurement pilot frequency transmission method is characterized in that, this method comprises:
A, according to the allocation situation of system resource, in a radio frames, select the part descending sub frame to carry described downlink measurement pilot frequency, in each descending sub frame of selecting, select an OFDM symbol, and selection portion is divided subcarrier on selected OFDM symbol, as the resource element that is used to carry described downlink measurement pilot frequency;
B, described downlink measurement pilot frequency is carried on the resource element that is used to carry described downlink measurement pilot frequency, is handed down to UE.
2. method according to claim 1 is characterized in that, OFDM symbol of described selection is: according to the allocation situation of system resource, and the OFDM symbol of other channel collision probability minimums in selection and this sub-district.
3. method according to claim 2 is characterized in that, when the long CP of the CP of system sampling, the OFDM symbol of selection is the 6th an OFDM symbol of even time slot in the determined descending sub frame.
4. method according to claim 1 is characterized in that, on selected OFDM symbol, every interval M subcarrier selects a subcarrier or one group as the described resource element that is used for the bearing downlink measurement pilot frequency, and M is default positive integer.
5. method according to claim 1 is characterized in that, according to the expense of certainty of measurement and downlink measurement pilot frequency, determines the number of the descending sub frame of the described downlink measurement pilot frequency of carrying.
6. method according to claim 5 is characterized in that, when there was discontinuous transmission DTX dormancy period in described system, described N was 2
n, n is a natural number.
7. method according to claim 1 is characterized in that, described downlink measurement pilot frequency is carried on the resource element that is used for the bearing downlink measurement pilot frequency is:
Described downlink measurement pilot frequency is superimposed upon on the user data, is carried on the described resource element that is used for the bearing downlink measurement pilot frequency;
Perhaps, remain for the resource element of bearing downlink measurement pilot frequency in advance, only carry described downlink measurement pilot frequency;
Perhaps, at the resource element place that is used for the bearing downlink measurement pilot frequency,, utilize this resource element only to carry described downlink measurement pilot frequency to the user data processing of punching.
8. method according to claim 1, it is characterized in that, when the downlink measurement pilot frequency of needs transmission is the downlink measurement pilot frequency of a plurality of different ports, according to the multiplex mode of different port downlink measurement pilot frequency, the downlink measurement pilot frequency of each port of determining is carried on the resource element that is used for the bearing downlink measurement pilot frequency.
9. method according to claim 8 is characterized in that, described multiplex mode is a code division multiplexing;
The mode of determining the described downlink measurement pilot frequency of each port is:
Utilize default orthogonal sequence as described downlink measurement pilot frequency; The out of phase rotation of the corresponding described orthogonal sequence of the downlink measurement pilot frequency of different port;
Described downlink measurement pilot frequency is carried on the resource element that is used to carry described downlink measurement pilot frequency is: the downlink measurement pilot frequency of different port is carried on identical resource element.
10. method according to claim 9 is characterized in that, according to sub-district ID, be used for the subframe numbers timeslot number of bearing downlink measurement pilot frequency, high-level signaling and bandwidth generate described orthogonal sequence.
11., it is characterized in that as downlink measurement pilot frequency, the phase place of the corresponding ZC sequence of the downlink measurement pilot frequency of different port rotates to be with the ZC sequence according to claim 9 or 10 described methods
n
CQI-RS=0...N, wherein, n
CQI-RSBe port index, N is the port sum.
12. method according to claim 8 is characterized in that, described multiplex mode is the part code division multiplexing;
The mode of determining the described downlink measurement pilot frequency of each port is: with the different port grouping, the downlink measurement pilot frequency of port adopts different orthogonal sequences on the same group in advance;
Described downlink measurement pilot frequency is carried on the resource element that is used to carry described downlink measurement pilot frequency is: the downlink measurement pilot frequency of port is not carried on different resource elements on the same group;
After described downlink measurement pilot frequency being carried on the resource element that is used for the bearing downlink measurement pilot frequency, this method further comprises: generate scrambler according to sub-district ID, subframe numbers and timeslot number, to described downlink measurement pilot frequency scrambling.
13. method according to claim 8 is characterized in that, described multiplex mode is the frequency division multiplexing mode;
The mode of determining the described downlink measurement pilot frequency of each port is: each port adopts identical sequence as downlink measurement pilot frequency;
Described downlink measurement pilot frequency is carried on the resource element that is used to carry described downlink measurement pilot frequency is: the downlink measurement pilot frequency of different port is carried on different described resource elements;
After described downlink measurement pilot frequency being carried on the resource element that is used for the bearing downlink measurement pilot frequency, this method further comprises: according to sub-district ID, subframe numbers, and timeslot number, system bandwidth generates scrambler, to described downlink measurement pilot frequency scrambling.
14. method according to claim 1 is characterized in that, further comprises between step a and step b: the descending sub frame and the resource element information of the described downlink measurement pilot frequency of carrying definite among the step a are kept among base station and the UE.
15. method according to claim 1 is characterized in that, in system's running, carries out described step a according to the real-time allocation situation of system resource; And further comprise between step a and step b: the descending sub frame and the resource element information of the described downlink measurement pilot frequency of determining in step a of carrying are handed down to UE by high-level signaling.
16. a downlink measurement pilot frequency transmitting device is characterized in that, this device comprises:
The downlink measurement pilot frequency position determination unit, be used for allocation situation according to system resource, in a radio frames, select the part descending sub frame to carry described downlink measurement pilot frequency, in each descending sub frame of selecting, select an OFDM symbol, and selection portion is divided subcarrier on selected OFDM symbol, as the resource element that is used to carry described downlink measurement pilot frequency;
Data form and transmitting element, are used for the multiplex mode according to the described downlink measurement pilot frequency of each port, and the described downlink measurement pilot frequency of each port of determining is carried on the resource element that is used to carry described downlink measurement pilot frequency, are handed down to UE.
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