CN104716998A - Reference signal transmitting method and device - Google Patents
Reference signal transmitting method and device Download PDFInfo
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- CN104716998A CN104716998A CN201310693384.5A CN201310693384A CN104716998A CN 104716998 A CN104716998 A CN 104716998A CN 201310693384 A CN201310693384 A CN 201310693384A CN 104716998 A CN104716998 A CN 104716998A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
- H04B7/0608—Antenna selection according to transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
Abstract
The invention discloses a reference signal transmitting method and device and belongs to the reference signal transmitting technology in the field of wireless communication. The reference signal transmitting method includes the steps that M antennas are selected from an antenna array containing X antennas and serve as reference antennas for transmitting reference signals, and the reference signals are transmitted by the M reference antennas, wherein M is smaller than X, and the M reference antennas are scattered in the antenna array. Compared with an existing method that the reference signals are transmitted by all antennas, the method and device have the advantages that reference signal transmission expense is small and effective transmission efficiency of the antenna array is high.
Description
Technical field
The present invention relates to the reference signal transmission technology of wireless communication field, particularly relate to a kind of reference signal launching technique and device.
Background technology
For the spectrum efficiency in raising radio communication and power efficiency, capacity and covering, introduce the Massive antenna array scheme based on large dimension antenna alignment, the degree of depth can excavate and utilize the Radio Resource in space, spectrum efficiency and the power efficiency of system can be improved in theory significantly.But the transmission of Massive aerial array will present some new characteristics, such as: channel will have significantly openness in spatial distribution; Large array beams can the impact of almost complete stress release treatment, but the co-channel interference that pilot pollution etc. cause becomes the principal element of system for restricting performance.In the face of above-mentioned feature, the high efficient and reliable transmission of Massive aerial array be realized; First the acquisition problem solving receiving terminal channel condition information is needed.
In the prior art, the acquisition of receiving terminal channel condition information realizes by receiving the reference signal sent by antennas all in aerial array; And the frequency interval sending the subcarrier of reference signal is very little.Obviously, the sharply increase significantly increasing the expense that must cause the reference signal obtained for channel condition information of number of transmission antennas, and then will the problem that the effective efficiency of transmission of Massive aerial array is low be caused.
Summary of the invention
In view of this, embodiments provide a kind of reference signal launching technique and device, can effectively reduce reference signal expense, improve effective efficiency of transmission of aerial array.
For achieving the above object, technical scheme of the present invention is achieved in that
First aspect present invention provides a kind of reference signal launching technique, and described method comprises:
M root antenna is chosen, as the reference antenna sending reference signal from the aerial array comprising X root antenna; Described M is less than X, and described M root reference antenna scatters in an antenna array;
Described M root reference antenna sends reference signal.
Preferably, from the aerial array comprising X root antenna, choose M root antenna, comprise as the reference antenna sending reference signal:
X ' root antenna is chosen, as the candidate reference antenna sending reference signal from the aerial array comprising X root antenna; Described X ' is not more than X;
Described X ' root candidate reference antenna is divided into N number of candidate reference antenna sets, and each described candidate reference antenna sets comprises M root antenna; Described M is not more than X ';
Choose a reference antenna as transmission reference signal in N number of candidate reference antenna sets.
Preferably, different groups in described N number of candidate reference antenna sets comprise at least one same antenna.
Preferably, of choosing described in N number of candidate reference antenna sets as the reference antenna sending reference signal is:
According to determining that order circulation to choose in N number of candidate reference antenna sets each as the reference antenna sending reference signal.
Preferably, before described M root reference antenna sends reference signal, described method also comprises:
In the channel measurement interval sending reference signal, selected i-th reference antenna sends the Q of described reference signal
iindividual running time-frequency resource unit; Described i is the positive integer being not more than described M;
Described channel measurement interval comprises K time-domain OFDM symbol; Described K is for being not less than 1 integer;
A corresponding time-domain OFDM symbol of described running time-frequency resource unit and a subcarrier in frequency domain;
Different reference antenna is different for the running time-frequency resource unit sending reference signal;
Described Q
ibe less than total number of sub-carriers Y; Described Q
isubcarrier corresponding to individual running time-frequency resource unit is dispersed in the bandwidth that a described Y subcarrier formed.
Preferably, described selected i-th reference antenna sends the Q of described reference signal
iindividual running time-frequency resource unit comprises:
W running time-frequency resource unit is chosen, as the candidate reference running time-frequency resource unit of carrying reference signal from comprising K*Y running time-frequency resource unit; Described W is not more than K*Y;
Described W candidate reference running time-frequency resource unit is divided into P candidate reference running time-frequency resource unit group;
Wherein, the running time-frequency resource unit included by different candidate reference running time-frequency resource unit group is different;
One group is chosen, as the reference running time-frequency resource of the reference signal that carrying i-th reference antenna sends from described P candidate reference running time-frequency resource unit group.
Preferably, describedly from described P candidate reference running time-frequency resource unit group, choose one group, the reference running time-frequency resource of the reference signal sent as carrying i-th reference antenna is:
According to determining that order circulates the every M group chosen in described P candidate reference running time-frequency resource group;
I-th group in described M group is that i-th reference antenna is for sending the running time-frequency resource unit group of reference signal.
Preferably, described P is the integral multiple of M.
Preferably, the running time-frequency resource unit of the carrying reference signal selected by any two neighbor cells is different.
Preferably, described M root reference antenna is evenly distributed in described aerial array.
Second aspect present invention provides a kind of reference signal emitter, and described device comprises reference antenna and chooses unit and aerial array;
Described reference antenna chooses unit, in order to choose M root antenna from the aerial array comprising X root antenna, as the reference antenna sending reference signal; Described M is less than X, and described M root reference antenna scatters in an antenna array;
Described M root reference antenna, in order to send reference signal.
Based on such scheme, described reference antenna is chosen unit and is comprised:
First chooses module, in order to choose X ' root antenna from the aerial array comprising X root antenna, as the candidate reference antenna sending reference signal; Described X ' is not more than X;
Grouping module, in order to described X ' root candidate reference antenna is divided into N number of candidate reference antenna sets, each candidate reference antenna sets comprises M root antenna; Described M is not more than X ';
Second chooses module, in order to choose a reference antenna as transmission reference signal in N number of candidate reference antenna sets.
Based on such scheme, described device also comprises:
Running time-frequency resource chooses unit, and in order in the channel measurement interval sending reference signal, selected i-th reference antenna sends the Q of described reference signal
iindividual running time-frequency resource unit; Described i is the positive integer being not more than described M;
Described channel measurement interval comprises K time-domain OFDM symbol; Described K is for being not less than 1 integer;
A corresponding time-domain OFDM symbol of described running time-frequency resource unit and a subcarrier in frequency domain;
Different reference antenna is different for the running time-frequency resource unit sending reference signal;
Described Q
ibe less than total number of sub-carriers Y; Described Q
isubcarrier corresponding to individual running time-frequency resource unit is dispersed in the bandwidth that a described Y subcarrier formed.
Based on such scheme, described running time-frequency resource is chosen unit and is comprised:
3rd chooses module, in order to choose W running time-frequency resource unit from comprising in K*Y running time-frequency resource unit, as the candidate reference running time-frequency resource unit of carrying reference signal; Described W is not more than K*Y;
Second grouping module, in order to be divided into P candidate reference running time-frequency resource unit group by described W candidate reference running time-frequency resource unit; Wherein, the running time-frequency resource unit included by different candidate reference running time-frequency resource unit group is different;
4th chooses module, in order to choose one from described P candidate reference running time-frequency resource unit group.
Embodiments provide a kind of reference signal launching technique and device, only make use of the some antennas transmitted reference signal in aerial array, thus decrease the antenna number of transmitted reference signal, reduce the reference signal expense of system, improve effective efficiency of transmission of aerial array, be particularly useful for the scene that Massive aerial array is applied.
Accompanying drawing explanation
Fig. 1 is one of reference signal launching technique schematic flow sheet described in first embodiment of the invention;
Fig. 2 is first embodiment of the invention M root reference antenna distribution schematic diagram in an antenna array;
Fig. 3 is the schematic flow sheet choosing M root reference antenna described in first embodiment of the invention;
Fig. 4 is the reference signal launching technique schematic flow sheet two described in first embodiment of the invention;
Fig. 5 is a kind of channel measurement interval schematic diagram described in first embodiment of the invention;
Fig. 6 is for choosing Q described in first embodiment of the invention
ithe schematic flow sheet of individual running time-frequency resource unit;
One of structural representation that Fig. 7 is the reference signal emitter described in second embodiment of the invention;
Fig. 8 is the structural representation two of the reference signal emitter described in second embodiment of the invention.
Embodiment
Below in conjunction with Figure of description and specific embodiment technical scheme of the present invention done and further elaborate.
First embodiment:
As shown in Figure 1, the present embodiment provides a kind of reference signal launching technique, and described method comprises:
Step S110: choose M root antenna from the aerial array comprising X root antenna, as the reference antenna sending reference signal; Described M is less than X, and described M root reference antenna scatters in an antenna array;
Step S120: described M root reference antenna sends reference signal.
Aerial array described in described step S110 can be Massive aerial array, and X root antenna alignment is embarked on journey and/or arranges.Described M root reference antenna scatters in an antenna array, is unconcentrated being distributed in described aerial array that M root antenna is sparse.Specifically as shown in Figure 2, if described aerial array comprises 32 antennas and is divided into 4 row 8 to arrange.Therefrom choose 8 antennas as reference antenna, and be selected 8 antennas are not concentrated distributions, but be dispersed in different rows and different lines, and mutually colleague or same column reference antenna between be spaced at least one non-reference antenna, wherein, described non-reference antenna is the antenna not sending reference signal.In fig. 2, solid black point represents selected reference antenna, and described hollow dots is non-reference antenna.
Concrete M root antenna of how choosing from X root antenna has multiple method as with reference to antenna.Concrete as, by the management entity of aerial array, M root antenna can be randomly drawed from X root antenna, or choose M root antenna wherein according to the selective rules prestored.Concrete implementation has multiple, does not just repeat one by one at this.
M root reference antenna sends reference signal, and described reference signal is used for receiving terminal to the estimation of channel status or channel measurement.How described M root reference antenna specifically sends reference signal, can adopt sending method in prior art, as broadcast reference signal.After receiving terminal receives the reference signal of described M root reference antenna transmission, adopt the advanced technology such as compressed sensing or space interpolation to process received reference signal, and then the channel status obtaining complete X root antenna is estimated.
Compressed sensing (Compressive Sensing is called for short CS) is a kind of technology that less sample of signal can be utilized to recover primary signal.If the transform-domain signals of primary signal is sparse, the primary signal sample of ascertain the number (the sample of signal number much smaller than total) that adopt compressed sensing technology can extract from primary signal, follow the trail of (Basis Pursuit is called for short BP) method by utilizing base and just can reconstruct primary signal.Test shows that most of wireless channel is in time domain and spatial domain, is all that multipath is sparse usually.Therefore adopt compressed sensing technology to process reference signal, the described openness traffic volume greatly reducing reference signal can be utilized, thus reduce the expense sending reference signal.
In reference signal launching technique described in the present embodiment, the whole antennas in aerial array are utilized to send reference signal relative to tradition, the antenna number of obvious transmitted reference signal decreases, thus reduce the expense of the reference signal of system, thus more running time-frequency resource can be used for sending communication data etc., finally improves effective efficiency of transmission of aerial array.
As further improvement of this embodiment, as shown in Figure 3, the present embodiment has done further specified in more detail to described step S110, specific as follows:
Described step S110 comprises:
Step S111: choose X ' root antenna from the aerial array comprising X root antenna, as the candidate reference antenna sending reference signal; Described X ' is not more than X;
Step S112: described X ' root candidate reference antenna is divided into N number of candidate reference antenna sets, and each described candidate reference antenna sets comprises M root antenna; Described M is not more than X ';
Step S113: choose in N number of candidate reference antenna sets, as the reference antenna sending reference signal.
In the present embodiment, utilizing step S111 have chosen may as the individual candidate reference antenna of X ' with reference to antenna, recycling step S112 carries out the grouping of candidate reference antenna, when needs transmitted reference signal, utilizes step S113 one group of choosing wherein to carry out the transmitting of reference signal.Adopt the above-mentioned method choosing reference antenna, utilize step S111 and step S112, disposablely define several candidate reference antenna sets, thus when wanting transmitted reference signal, only need the selecting step carrying out step S113 next time.The reference antenna choosing method of one is chosen in the N number of candidate reference antenna sets formed from described step S112, choose in units of group, all to choosing reference antenna one by one before not being each transmitted reference signal, thus improve the efficiency choosing reference antenna.Described in concrete implementation procedure, M equals any positive integer.Antenna total number X in usual aerial array is very large, thus described M is much smaller than described X.
Describe for simplifying candidate reference antenna, be numbered by X ' root candidate reference antenna, wherein, each root antenna is represented by the index determined.
Wherein, described step S112 comprises:
Random selecting or according to determining rule, chooses included M the reference antenna of each group in described N number of candidate reference antenna sets.
Regularly equally spacedly choose candidate reference antenna according to determining that rule is chosen to comprise, the candidate reference antenna that candidate reference antenna sets is comprised scatters in an antenna array.Such as, imagination candidate reference antenna number X ' equals the product of the antenna number M that candidate reference antenna sets number N comprises with each group, then likely form N number of candidate reference antenna sets below:
First group: 1, N+1,2N+1,3N+1,4N+1,5N+1 ..., (M-1) N+1;
Second group: 2, N+2,2N+2,3N+2,4N+2,5N+2 ..., (M-1) N+2;
3rd group: 3, N+3,2N+3,3N+3,4N+3,5N+3 ..., (M-1) N+3;
…………………………
N group: N, 2N, 3N, 4N, 5N, 6N ..., MN.
Wherein, in above-mentioned grouping, N is the group number of candidate reference antenna, the spacing that to be also simultaneously N be also between two candidate reference antennas.Described according to determine that rule chooses in N number of candidate reference antenna sets each included by M root antenna be not limited to aforesaid way.
The random packet that random selecting comprises according to determining directly obtains.
Example 1, imagination candidate reference antenna number X ' equals the product of the antenna number M that candidate reference antenna sets number N comprises with each group, particularly: imagine X '=32, N=4 and M=8, then likely form the grouping of following determination:
First group: 5,10,13,20,22,24,27,31;
Second group: 3,7,9,11,17,23,25,32;
3rd group: 1,6,12,14,16,18,28,30;
4th group: 2,4,8,15,19,21,26,29.
Example 2, imagination candidate reference antenna number X ' is less than the product of the antenna number M that candidate reference antenna sets number N comprises with each group, and particularly: imagination X '=32, N=4 and M=10, then likely form the grouping determined below:
First group: 1,5,10,13,17,20,22,24,27,31;
Second group: 3,7,9,11,15,17,23,25,28,32;
3rd group: 1,6,12,14,16,18,21,26,28,30;
4th group: 2,4,8,11,15,19,21,24,26,29.
In above example 2, different candidate reference antenna sets comprises at least one same antenna, and the namely different antenna part antennas included by candidate reference antenna sets is identical; Such as, first and second candidate reference antenna sets all comprises 17, second, candidate reference antenna and the 4th candidate reference antenna sets all comprises candidate reference antenna 11 and 15.
Conveniently store and follow-up choosing, after the management entity of described aerial array obtains N group candidate reference antenna, stored the formation of N group candidate reference antenna, concrete realization comprises the steps:
Record the index of each group candidate reference antenna, and store with the form of array;
When needs send reference signal, look for the candidate reference antenna to correspondence according to the index of candidate reference antenna, and send reference signal.
Adopting choosing and storage means of above-mentioned reference antenna, when sending reference signal, the reference antenna sending reference signal can be determined as far as possible soon.
For continuous print channel measurement interval, preferred according to determining that order circulation chooses in N number of candidate reference antenna sets that each sends described reference signal in the present embodiment, namely all candidate reference antenna sets are traveled through, more comprehensively reference signal is obtained to make receiving terminal, the reference signal that adjacent channel measurement interval receives is different, thus obtains the estimation of more accurate channel status.Such as, the total N of imagination equals 4(and N=4) individual candidate reference antenna sets, then the 1st to the 4th sends the channel measurement interval of reference signal, choose the 1st group to the 4th group candidate reference antenna successively, the channel measurement interval of the 5th to the 8th transmission reference signal remains chooses the 1st group to the 4th group candidate reference antenna successively, by that analogy.
In the process realized, different districts comprises choosing of reference antenna:
The first: the corresponding same candidate reference antenna in different districts, corresponding same candidate reference antenna packet mode or grouping rule, and sending the channel measurement interval of reference signal, the corresponding identical or different candidate reference antenna sets in different districts;
The second: the corresponding same candidate reference antenna in different districts, corresponding different candidate reference antenna packet mode or grouping rule;
The third: the corresponding different candidate reference antenna in different districts.
As further improvement of this embodiment, as shown in Figure 4, before described M root reference antenna sends reference signal, described method also comprises:
Step S100: in the channel measurement interval sending reference signal, selected i-th reference antenna sends the Q of described reference signal
iindividual running time-frequency resource unit; Described i is the positive integer being not more than described M;
Described channel measurement interval comprises K time domain OFDM (Orthogonal Frequency DivisionMultiplexing, OFDM) symbol; Described K be not less than 1 integer;
A corresponding time-domain OFDM symbol of described running time-frequency resource unit and a subcarrier in frequency domain;
Different reference antennas is different for the running time-frequency resource unit sending reference signal.
Described Q
ibe less than total number of sub-carriers Y; Described Q
isubcarrier corresponding to individual running time-frequency resource unit is dispersed in the bandwidth that a described Y subcarrier formed.
In specific implementation process, there is no dividing of priority between described step S100 and described step S110, as shown in Figure 3, first can carry out step S100 and carry out step S110 again; Also can synchronously carry out, or step S110 is prior to step S100 with step S110 by step S100.
Channel measurement interval comprises K continuous print time-domain OFDM symbol altogether, and system bandwidth comprises Y subcarrier in frequency domain continuously, then channel measurement interval is corresponding, and K is multiplied by Y running time-frequency resource unit.As shown in Figure 5, channel measurement interval wherein comprises K and equals 7 continued time domain OFDM symbol, and channel measurement interval comprises 7 altogether and is multiplied by Y running time-frequency resource unit.
Described step S100 chooses Q successively from the channel measurement interval comprising K*Y running time-frequency resource unit
1, Q
2..., Q
mindividual running time-frequency resource unit, respectively as the reference running time-frequency resource of the reference signal that the described M root reference antenna of carrying sends.Such as, Q
15the number of the running time-frequency resource unit of the carrying reference signal selected by the 15th reference antenna.
In concrete implementation procedure, described step S100 is by running time-frequency resource management entity, chooses successively comprise Q according to the grouping determined
1, Q
2..., Q
mm running time-frequency resource unit group of individual running time-frequency resource unit or choose Q successively according to the selective rules prestored
1, Q
2..., Q
mindividual running time-frequency resource unit.Y the subcarrier in frequency domain frequency that system bandwidth comprises is continuous print, and the Q be selected
isparse and the de-centralized of sub-carrier frequencies corresponding to individual running time-frequency resource unit be distributed in the system bandwidth comprising a described Y subcarrier in frequency domain, obtain the reference signal that more can reflect current channel condition to make receiving terminal.
Reference signal launching technique described in the present embodiment, only have chosen a little part in K*Y running time-frequency resource unit to carry reference signal, but not most running time-frequency resource unit all will be used for carrying reference signal, thus decrease the running time-frequency resource unit number of carrying reference signal, thus again reduce the reference signal expense of system, finally improve effective efficiency of transmission of aerial array.
The selection of the same reference running time-frequency resource in order to accelerate reference signal, as shown in Figure 6, present embodiments provides the following choosing method with reference to running time-frequency resource:
Described step S100 comprises:
Step S101: choose W running time-frequency resource unit from comprising K*Y running time-frequency resource unit, as the candidate reference running time-frequency resource unit of carrying reference signal; Described W is not more than K*Y;
Step S102: described W candidate reference running time-frequency resource unit is divided into P candidate reference running time-frequency resource unit group; Preferred described P equals the integral multiple of M.Any two groups in described P candidate reference running time-frequency resource unit group, identical or different running time-frequency resource unit number can be comprised, and the running time-frequency resource unit difference included by any two candidate reference running time-frequency resource unit groups;
Step S103: the reference running time-frequency resource choosing a reference signal sent as carrying i-th reference antenna in P candidate reference running time-frequency resource unit group, or from P group, choose M group, respectively as the reference running time-frequency resource of the reference signal that the described M root reference antenna of carrying sends; Wherein, the running time-frequency resource unit number of described M candidate reference running time-frequency resource unit group is respectively Q
1, Q
2..., Q
mindividual.
Wherein, described W candidate reference running time-frequency resource unit can only include the part time-domain OFDM symbol in a described K time-domain OFDM symbol; Such as, if channel measurement interval comprises 7(and K=7) individual time-domain OFDM symbol, then described W candidate reference running time-frequency resource unit can only include 1-3 time domain OFMM symbol or 3-5 time-domain OFDM symbol.
First, adopt step S101 and described step S102, disposablely define multiple may be used for and carry the candidate reference running time-frequency resource unit group of reference signal, when the transmitting of follow-up reference signal, selection with reference to running time-frequency resource is for the base unit selected carries out with running time-frequency resource unit group, instead of selection is one by one with reference to running time-frequency resource unit, thus accelerate the selection with reference to running time-frequency resource.Secondly, when carrying out the grouping of candidate reference running time-frequency resource unit in described step S102, ensure that the running time-frequency resource unit included by different candidate reference running time-frequency resource unit group is different, thus different noiseless each other when carrying the reference signal of different reference antenna at same channel measurement interval with reference to running time-frequency resource unit group, and then ensure that normal transmission and the reception of reference signal.
From the above, adopt step S101 to step S103 to carry out the selection of reference running time-frequency resource, the running time-frequency resource unit number that different candidate reference running time-frequency resource unit group comprises is equal or not etc.Preferred different candidate reference running time-frequency resource unit group comprises identical running time-frequency resource unit number Q in the present embodiment, and then candidate reference running time-frequency resource unit number W can be met, equal the product of the running time-frequency resource unit number Q that candidate reference running time-frequency resource list number of tuples P comprises with every group.
Describe for simplifying candidate reference running time-frequency resource unit, W candidate reference running time-frequency resource unit is numbered.Such as, be numbered in the mode of time domain after first frequency domain; Wherein, each is represented by the index determined with reference to running time-frequency resource unit.
Wherein, described step S102 comprises:
Random selecting or according to determining rule, chooses included Q the running time-frequency resource unit of each group in described P candidate's running time-frequency resource unit group.
Regularly equally spacedly choosing candidate's running time-frequency resource unit according to determining that rule is chosen to comprise, to make the subcarrier in candidate's running time-frequency resource unit group corresponding to candidate's running time-frequency resource unit be dispersed in system bandwidth, is below a concrete example:
First group: 1, P+1,2P+1,3P+1,4P+1,5P+1 ..., (Q-1) P+1;
Second group: 2, P+2,2P+2,3P+2,4P+2,5P+2 ..., (Q-1) P+2;
3rd group: 3, P+3,2P+3,3P+3,4P+3,5P+3 ..., (Q-1) P+3;
…………………………
P group: P, 2P, 3P, 4P, 5P, 6P ..., QP.
Wherein, in above example, define P candidate reference running time-frequency resource unit group altogether, and any two candidate reference running time-frequency resource unit are that spacing is selected with P.Described according to determine that rule chooses in P candidate's running time-frequency resource unit group each included by Q running time-frequency resource unit be not limited to aforesaid way.
The grouping example of a kind of direct acquisition P candidate reference running time-frequency resource unit group is below provided:
Imagination W=64, P=8 and Q=8, then likely form the following grouping determined:
First group: 3,8,18,31,38,43,50,58;
Second group: 5,11,23,30,40,45,54,62;
3rd group: 10,17,27,34,42,49,59,63;
4th group: 1,13,21,29,35,44,55,60;
5th group: 7,15,19,25,37,48,61,64;
6th group: 2,9,14,22,28,36,47,52;
7th group: 4,12,20,26,32,39,53,56;
8th group: 6,16,24,33,41,46,51,57.
In above example, the running time-frequency resource unit that different candidate reference running time-frequency resource unit groups comprises is different.
Conveniently store and follow-up choosing, the management entity of described running time-frequency resource, after obtaining P group candidate reference running time-frequency resource unit, has stored the formation of P group candidate reference running time-frequency resource unit, directly to use during follow-up carrying reference signal; Concrete realization comprises the steps:
Record the index of each group candidate reference running time-frequency resource unit, and store with the form of array;
When needs send reference signal, the index according to candidate reference running time-frequency resource unit adopts corresponding candidate reference running time-frequency resource unit, carrying reference signal.
Adopting above-mentioned choosing and storage means with reference to running time-frequency resource unit, when sending reference signal, the reference running time-frequency resource unit carrying reference signal can be determined as far as possible soon.
At continuous print channel measurement interval, preferred according to determining that order circulates the every M group chosen in P candidate reference resource unit group in the present embodiment, for the reference signal that M root reference antenna sends.When namely choosing running time-frequency resource unit group, travel through all candidate reference running time-frequency resource unit groups, to make receiving terminal obtain more comprehensively reference signal, the reference signal that adjacent channel measurement interval receives is different, thus obtains the estimation of more accurate channel status.Such as, if the antenna number that each channel measurement interval sends reference signal is 4(and M=4), total 16(P=16) individual candidate reference running time-frequency resource unit group, then the 1st group to the 4th group candidate's running time-frequency resource unit can be chosen in the 1st channel measurement interval, for the reference signal that 4 reference antennas send, the 5th group to the 8th group candidate's running time-frequency resource unit can be chosen in 2nd channel measurement interval, for the reference signal that 4 reference antennas send, the 1st group to the 4th group candidate's running time-frequency resource unit is still chosen at 5th channel measurement interval, for the reference signal that 4 reference antennas send, by that analogy.
In the process realized, different districts comprises with reference to choosing of running time-frequency resource unit:
The candidate reference running time-frequency resource unit that different districts is corresponding identical and identical candidate reference running time-frequency resource unit packet mode or grouping rule.
Usual different districts is covered by different antennae array, and the community on border is neighbor cell altogether.In order to prevent the mutual interference between the reference signal of adjacent area, further define in the present embodiment, specific as follows:
When the reference antenna of described neighbor cell sends reference signal, the reference running time-frequency resource that any two neighbor cells are chosen for carrying reference signal is different.
In the process of specific implementation, the management entity of aerial array manages the antenna sending reference signal, and the running time-frequency resource unit of management entity to carrying reference signal of running time-frequency resource manages, simple and convenient.The management entity of aerial array and running time-frequency resource is positioned at network side or base station side, and corresponds to identical or different physical entity (described physical entity is as the Network Management Equipment of base station itself and management of base station).
In reference signal launching technique described in the present embodiment, the some antennas that only have chosen in aerial array relative to existing method sends reference signal, and the very fraction running time-frequency resource that have chosen in running time-frequency resource corresponding to channel measurement interval is to carry reference signal, the quantity of reference signal greatly reducing, thus decrease reference signal the taking running time-frequency resource of system, give and send communication data with more running time-frequency resource, reduce the power consumption that aerial array sends reference signal simultaneously.
Second embodiment
As shown in Figure 7, the present embodiment provides a kind of reference signal emitter, and described device comprises reference antenna and chooses unit 510 and aerial array 520;
Described reference antenna chooses unit 510, in order to choose M root antenna from the aerial array comprising X root antenna, as the reference antenna sending reference signal; Described M is less than X, and described M root reference antenna scatters in an antenna array;
Described M root reference antenna, in order to send reference signal.
The concrete structure that described reference antenna chooses unit 510 can comprise processor; Described processor can be central processing unit, single-chip microcomputer, digital processing unit or programmable logic array, is self-contained unit or the structure that is integrated in the management equipment of described aerial array.Concrete, described reference antenna chooses the management equipment that unit 510 can be described aerial array.Described reference signal emitter also comprises storage medium; Described storage medium comprises non-moment storage medium; Described non-moment storage medium stores software or firmware, handled device is connected with described storage medium, run described software or firmware, from the aerial array comprising X root antenna, choose M root in order to send the antenna of reference signal as reference antenna using at least realizing.
Reference signal emitter described in the present embodiment, for the reference signal launching technique described in the first embodiment provides physical unit, same having reduces the reference signal expense of aerial array, improves the advantages such as the effective efficiency of transmission of aerial array.
Further, described reference antenna is chosen unit 510 and is comprised:
First chooses module, in order to choose X ' root antenna from the aerial array comprising X root antenna, as the candidate reference antenna sending reference signal; Described X ' is not more than X; First chooses module can choose X ' root according to the algorithm prestored or at random from X root antenna, realizes the initial option of reference antenna;
Grouping module, in order to described X ' root candidate reference antenna is divided into N number of candidate reference antenna sets, each candidate reference antenna sets comprises M root antenna; Described M is not more than X '; Grouping module is when carrying out the grouping of reference antenna, and need the reference antenna in same group is scattered in an antenna array, the nonconcentrated distribution that namely antenna of same reference antenna group is sparse in an antenna array;
Second chooses module, in order to choose a reference antenna as transmission reference signal in N number of candidate reference antenna sets.Second chooses module, achieves the selection again of reference antenna, the community that aerial array covers, can from once dividing into groups the N group reference antenna that formed, random or regularly chooses the transmission that a group realizes reference signal.
Adopt the reference signal emitter described in the present embodiment, one time reference antenna is selected and grouping, may be used for repeatedly the transmission of the reference signal of reference signal and multiple community, the flow process of reference signal transmitting is simple and operation that is experience is few, thus the resource that reference signal emitter execution reference signal spends is few.
As shown in Figure 8, the reference signal emitter described in the present embodiment, described device also comprises:
Running time-frequency resource chooses unit 530, and in order in the channel measurement interval sending reference signal, selected i-th reference antenna sends the Q of described reference signal
iindividual running time-frequency resource unit; Described i is the positive integer being not more than described M;
Described channel measurement interval comprises K time-domain OFDM symbol; Described K is for being not less than 1 integer;
A corresponding time-domain OFDM symbol of described running time-frequency resource unit and a subcarrier in frequency domain;
Different reference antennas is different for the running time-frequency resource unit sending reference signal;
Described Q
ibe less than total number of sub-carriers Y; Described Q
isubcarrier corresponding to individual running time-frequency resource unit is dispersed in the bandwidth that a described Y subcarrier formed.
In addition, described running time-frequency resource is chosen unit and is comprised:
3rd chooses module, in order to choose W running time-frequency resource unit from comprising in K*Y running time-frequency resource unit, as the candidate reference running time-frequency resource unit of carrying reference signal; Described W is not more than K*Y;
Second grouping module, in order to be divided into P candidate reference running time-frequency resource unit group by described W candidate reference running time-frequency resource unit; Wherein, the running time-frequency resource unit included by different candidate reference running time-frequency resource unit group is different;
4th chooses module, in order to choose one from described P candidate reference running time-frequency resource unit group.
The concrete structure that running time-frequency resource chooses unit 530 can comprise processor; Described processor can be central processing unit, single-chip microcomputer, digital processing unit or programmable logic array, is self-contained unit or the structure that is integrated in the management equipment of described aerial array.Concrete, running time-frequency resource chooses the management equipment that unit 530 can be described running time-frequency resource.Described reference signal emitter also comprises storage medium; Described storage medium comprises non-moment storage medium; Described non-moment storage medium stores software or firmware, and handled device is connected with described storage medium, runs described software or firmware, and in order in the channel measurement interval sending reference signal, selected i-th reference antenna sends the Q of described reference signal
iindividual running time-frequency resource unit.
Q
ibe less than total number of sub-carriers Y, Q
isubcarrier corresponding to individual running time-frequency resource unit is dispersed in bandwidth that Y subcarrier formed or sparse not integrated distribution, can obtain channel estimating more accurately to facilitate receiving terminal.
In concrete implementation procedure, described aerial array is a part of base station, then described reference antenna is chosen unit 510 and described running time-frequency resource to choose unit 530 can be the device or the device be integrated on the Network Management Equipment of base station that are integrated on described base station, is preferably integrated in the present embodiment on described base station.
Reference signal dispensing device described in the present embodiment, can realize arbitrary technical scheme of the reference signal launching technique described in the first embodiment, and the same reference signal expense with the system of reducing, improves the advantage of effective efficiency of transmission of aerial array.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (14)
1. a reference signal launching technique, is characterized in that, described method comprises:
M root antenna is chosen, as the reference antenna sending reference signal from the aerial array comprising X root antenna; Described M is less than X, and described M root reference antenna scatters in an antenna array;
Described M root reference antenna sends reference signal.
2. method according to claim 1, is characterized in that, chooses M root antenna from the aerial array comprising X root antenna, comprises as the reference antenna sending reference signal:
X ' root antenna is chosen, as the candidate reference antenna sending reference signal from the aerial array comprising X root antenna; Described X ' is not more than X;
Described X ' root candidate reference antenna is divided into N number of candidate reference antenna sets, and each described candidate reference antenna sets comprises M root antenna; Described M is not more than X ';
Choose a reference antenna as transmission reference signal in N number of candidate reference antenna sets.
3. method according to claim 2, is characterized in that, different groups in described N number of candidate reference antenna sets comprise at least one same antenna.
4. according to the method in claim 2 or 3, it is characterized in that, described in choose in N number of candidate reference antenna sets one and as the reference antenna sending reference signal be:
According to determining that order circulation to choose in N number of candidate reference antenna sets each as the reference antenna sending reference signal.
5. the method according to claim 1,2 or 3, is characterized in that, before described M root reference antenna sends reference signal, described method also comprises:
In the channel measurement interval sending reference signal, selected i-th reference antenna sends the Q of described reference signal
iindividual running time-frequency resource unit; Described i is the positive integer being not more than described M;
Described channel measurement interval comprises K time-domain OFDM symbol; Described K is for being not less than 1 integer;
A corresponding time-domain OFDM symbol of described running time-frequency resource unit and a subcarrier in frequency domain;
Different reference antenna is different for the running time-frequency resource unit sending reference signal;
Described Q
ibe less than total number of sub-carriers Y; Described Q
isubcarrier corresponding to individual running time-frequency resource unit is dispersed in the bandwidth that a described Y subcarrier formed.
6. method according to claim 5, is characterized in that, described selected i-th reference antenna sends the Q of described reference signal
iindividual running time-frequency resource unit comprises:
W running time-frequency resource unit is chosen, as the candidate reference running time-frequency resource unit of carrying reference signal from comprising K*Y running time-frequency resource unit; Described W is not more than K*Y;
Described W candidate reference running time-frequency resource unit is divided into P candidate reference running time-frequency resource unit group;
Wherein, the running time-frequency resource unit included by different candidate reference running time-frequency resource unit group is different;
One group is chosen, as the reference running time-frequency resource of the reference signal that carrying i-th reference antenna sends from described P candidate reference running time-frequency resource unit group.
7. the method according to claim 5 or 6, is characterized in that, describedly from described P candidate reference running time-frequency resource unit group, chooses one group, and the reference running time-frequency resource of the reference signal sent as carrying i-th reference antenna is:
According to determining that order circulates the every M group chosen in described P candidate reference running time-frequency resource group;
I-th group in described M group is that i-th reference antenna is for sending the running time-frequency resource unit group of reference signal.
8. the method according to claim 5 or 6, is characterized in that, described P is the integral multiple of M.
9. method according to claim 5, is characterized in that, the running time-frequency resource unit of the carrying reference signal selected by any two neighbor cells is different.
10. the method according to claim 1,2 or 3, is characterized in that, described M root reference antenna is evenly distributed in described aerial array.
11. 1 kinds of reference signal emitters, is characterized in that, described device comprises reference antenna and chooses unit and aerial array;
Described reference antenna chooses unit, in order to choose M root antenna from the aerial array comprising X root antenna, as the reference antenna sending reference signal; Described M is less than X, and described M root reference antenna scatters in an antenna array;
Described M root reference antenna, in order to send reference signal.
12. devices according to claim 11, is characterized in that, described reference antenna is chosen unit and comprised:
First chooses module, in order to choose X ' root antenna from the aerial array comprising X root antenna, as the candidate reference antenna sending reference signal; Described X ' is not more than X;
Grouping module, in order to described X ' root candidate reference antenna is divided into N number of candidate reference antenna sets, each candidate reference antenna sets comprises M root antenna; Described M is not more than X ';
Second chooses module, in order to choose a reference antenna as transmission reference signal in N number of candidate reference antenna sets.
13. devices according to claim 11 or 12, it is characterized in that, described device also comprises:
Running time-frequency resource chooses unit, and in order in the channel measurement interval sending reference signal, selected i-th reference antenna sends the Q of described reference signal
iindividual running time-frequency resource unit; Described i is the positive integer being not more than described M;
Described channel measurement interval comprises K time-domain OFDM symbol; Described K is for being not less than 1 integer;
A corresponding time-domain OFDM symbol of described running time-frequency resource unit and a subcarrier in frequency domain;
Different reference antenna is different for the running time-frequency resource unit sending reference signal;
Described Q
ibe less than total number of sub-carriers Y; Described Q
isubcarrier corresponding to individual running time-frequency resource unit is dispersed in the bandwidth that a described Y subcarrier formed.
14. devices according to claim 13, is characterized in that, described running time-frequency resource is chosen unit and comprised:
3rd chooses module, in order to choose W running time-frequency resource unit from comprising in K*Y running time-frequency resource unit, as the candidate reference running time-frequency resource unit of carrying reference signal; Described W is not more than K*Y;
Second grouping module, in order to be divided into P candidate reference running time-frequency resource unit group by described W candidate reference running time-frequency resource unit; Wherein, the running time-frequency resource unit included by different candidate reference running time-frequency resource unit group is different;
4th chooses module, in order to choose one from described P candidate reference running time-frequency resource unit group.
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| CN201310693384.5A CN104716998A (en) | 2013-12-16 | 2013-12-16 | Reference signal transmitting method and device |
| PCT/CN2014/079110 WO2014187388A1 (en) | 2013-12-16 | 2014-06-03 | Reference signal transmission method, device and computer storage medium |
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