CN104717659A - Downlink pilot frequency transmission method and device - Google Patents
Downlink pilot frequency transmission method and device Download PDFInfo
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- CN104717659A CN104717659A CN201310676444.2A CN201310676444A CN104717659A CN 104717659 A CN104717659 A CN 104717659A CN 201310676444 A CN201310676444 A CN 201310676444A CN 104717659 A CN104717659 A CN 104717659A
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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
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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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
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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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
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
Abstract
The embodiment of the invention discloses a downlink pilot frequency transmission method comprising the following steps: configuring a sequence according to system parameters and a preset rule and generating a random number according to the sequence; and determining a resource index value of a downlink pilot frequency according to the sequence and the random number and transmitting the downlink pilot frequency. The embodiment of the invention further discloses a downlink pilot frequency transmission device.
Description
Technical field
The present invention relates to pilot transmission techniques, be specifically related to a kind of transmission method and device of descending pilot frequency.
Background technology
Along with the quick growth of mobile communication business traffic demand, following B4G/5G mobile communication system will in the face of demand more widely, and in 4G mobile communication standard, the employing of advanced multi-antenna technology and channel self-adapting technology etc. has made the spectrum efficiency of system approach channel capacity.Realize above-mentioned target, just need to adjust traditional network architecture, and find new Radio Resource growth point.The miniaturization of community and isomerization are the trend of future wireless network development, namely by shortening the distance between terminal and access point, can reduce the path loss of signal, can improve spectrum efficiency and the power efficiency of system; Capacity and covering is come exactly in addition by configuring more massive aerial array.
One of popular research direction of rising for nearly 2 years, namely based on extensive (Massive) antenna array scheme of large dimension antenna alignment, the degree of depth can be excavated and utilize the Radio Resource in space, can improve spectrum efficiency and the power efficiency of system 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 novel Massive aerial array transmission technology of high efficient and reliable be designed, first need the acquisition problem solving receiver side channel information.
At present, in Long Term Evolution (LTE, Long Term Evolution) system, resource is with spatial domain-antenna or antenna port, and time domain and frequency domain three-dimensional carry out distinguishing.Wherein, descending pilot frequency is all equally distributed on frequency domain, such as the measurement pilot frequency (CRS of channel condition information acquisition, Cell-specificreference signals) subcarrier spacing of adjacent two frequency pilot signs is 6, channel state information reference signals (CSI-RS, Channel-State Information Reference Signals) subcarrier spacing of adjacent two frequency pilot signs is 12, and every root antenna all needs to send pilot tone.
At the extensive antenna multiple-input, multiple-output (MIMO based on LTE, Multiple-Input Multiple-Output) in technology, because base station side is configured with large-scale antenna array, such as more than 100 antenna, even more, if need all to send pilot tone at every root antenna according to current protocol requirement, and the sub-carrier positions shared by pilot tone presses existing protocol mapping, pilot-frequency expense will be larger, has a strong impact on data transfer rate and the spectrum efficiency of system.Be used for the expense of the reference signal of channel information acquisition for reducing Massive aerial array, new channel state information acquisition method (such as based on compressed sensing or space interpolation etc.) is suggested.But it is not that also propose at present to have low expense and the solution of the transmission method of the efficient descending pilot frequency of above-mentioned channel information acquisition method can be applicable to.
Summary of the invention
For solving the technical problem of existing existence, the embodiment of the present invention provides a kind of transmission method and device of descending pilot frequency, ensure that the pilot tone frequency domain position of any two antennas of neighbor cell or same community is random distribution and can not collides, the empty frequency domain compression of pilot tone can be realized, the availability of frequency spectrum of elevator system.
For achieving the above object, the technical scheme of the embodiment of the present invention is achieved in that
The embodiment of the present invention provides a kind of transmission method of descending pilot frequency, and described method comprises:
According to system parameters and preset rules configuration sequence, and generate random number according to described sequence;
Send descending pilot frequency according to the resource index value of described sequence and described random number determination descending pilot frequency.
In such scheme, described system parameters comprises: antenna for base station total quantity, system maximum bandwidth.
In such scheme, described resource index value comprises: antenna index value, subcarrier in frequency domain index value, time-domain symbol index value.
In such scheme, described according to system parameters and preset rules configuration sequence and generate random number, according to the resource index value of described sequence and random number determination descending pilot frequency, comprising:
The length generating antenna index value random number sequence is determined according to antenna for base station total number;
The initial value of described random number sequence is determined according to preset rules; Wherein, described preset rules comprises: the antenna index value scope at described descending pilot frequency place covers all antennas;
Initial value cyclic shift according to described random number sequence generates multiple random number;
Described random number is defined as the antenna index value at descending pilot frequency place, wherein, the number of antennas at pilot tone place and the ratio of antenna for base station total number are less than the first predetermined threshold value.
In such scheme, described according to system parameters and preset rules configuration sequence and generate random number, according to the resource index value of described sequence and random number determination descending pilot frequency, comprising:
The length generating subcarrier index value random number sequence is determined according to system maximum bandwidth;
More than one sequence is determined according to described preset rules; Wherein, described preset rules comprises: the index range of the subcarrier at described descending pilot frequency place covers the bandwidth range of described system;
By described more than one sequence allocation to pilot tone place antenna in community and community, using the initial value of described sequence as random number sequence;
Initial value cyclic shift according to described random number sequence generates multiple random number; Wherein, in identical channel measurement time, multiple random numbers that the sequence of every root antenna configuration of neighbor cell generates are different;
Described random number is defined as the subcarrier index value at descending pilot frequency place, wherein, the subcarrier at pilot tone place is discontinuous and irregular distribution; And the total number of sub-carriers object ratio that the number of sub carrier wave at described pilot tone place and bandwidth comprise is less than the second predetermined threshold value.
In such scheme, described by described more than one sequence allocation to pilot tone place antenna in community and community, comprising:
Described more than one sequence divided into groups, sequence set is dispensed to each community, the sequence set that adjacent Liang Ge community is distributed is different;
By described more than one sequence allocation in described sequence set to pilot tone place antenna in community, the sequence that described pilot tone place antenna is obtained is all different.
In such scheme, the quantity of described more than one sequence is determined according to the antenna amount sending pilot tone in adjacent cell quantity and each community.
In such scheme, described method also comprises: in different channel measurement time, when antenna is by time division way transmission pilot tone, is the sequence that described antenna assignment is identical; Wherein, described channel measurement time interval comprises: at least one subframe, time slot or OFDM (OFDM, Orthogonal FrequencyDivision Multiplexing) symbol.
The embodiment of the present invention also provides a kind of transmitting device of descending pilot frequency, and described device comprises: configuration module, resource determination module and transport module; Wherein,
Described configuration module, for according to system parameters and preset rules configuration sequence, and generates random number according to described sequence, described sequence and random number is sent to resource determination module;
Described resource determination module, for the resource index value of the sequence that sends according to described configuration module and random number determination descending pilot frequency;
Described transport module, sends descending pilot frequency for the resource index value determined according to described resource determination module.
In such scheme, described configuration module, for determining the length generating antenna index value random number sequence according to antenna for base station total number; The initial value of described random number sequence is determined according to preset rules; Initial value cyclic shift according to described random number sequence generates multiple random number; Wherein, described preset rules comprises: the antenna index value scope at described descending pilot frequency place covers all antennas;
Described resource determination module, for described random number being defined as the antenna index value at descending pilot frequency place, wherein, the number of antennas at pilot tone place and the ratio of antenna for base station total number are less than the first predetermined threshold value.
In such scheme, described configuration module, for determining the length generating subcarrier index value random number sequence according to system maximum bandwidth; More than one sequence is determined according to described preset rules; By described more than one sequence allocation to pilot tone place antenna in community and community, using the initial value of described sequence as random number sequence; Initial value cyclic shift according to described random number sequence generates multiple random number; Wherein, described preset rules comprises: the index range of the subcarrier at described descending pilot frequency place covers the bandwidth range of described system; In identical channel measurement time, multiple random numbers that the sequence of every root antenna configuration of neighbor cell generates are different;
Described resource determination module, for described random number being defined as the subcarrier index value at descending pilot frequency place, wherein, the subcarrier at pilot tone place is discontinuous and irregular distribution; The total number of sub-carriers object ratio that the number of sub carrier wave at described pilot tone place and bandwidth comprise is less than the second predetermined threshold value.
In such scheme, described configuration module, also for described more than one sequence being divided into groups, is dispensed to each community by sequence set, and the sequence set that adjacent Liang Ge community is distributed is different; By described more than one sequence allocation in described sequence set to pilot tone place antenna in community, the sequence that described pilot tone place antenna is obtained is all different.
In such scheme, described configuration module, also in different channel measurement time, when antenna distributes identical sequence by during time division way transmission pilot tone; Wherein, described channel measurement time interval comprises: at least one subframe, time slot or OFDM symbol.
The transmission method of the descending pilot frequency that the embodiment of the present invention provides and device, according to system parameters and preset rules configuration sequence, and generate random number according to described sequence; Send descending pilot frequency according to the resource index value of described sequence and described random number determination descending pilot frequency; So, achieve the empty frequency domain compression of pilot tone, and ensure that the pilot tone frequency domain position of any two antennas of neighbor cell or same community is random distribution and can not collides, reach the object reducing pilot-frequency expense and AF panel simultaneously, improve the availability of frequency spectrum of system.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the transmission method of the descending pilot frequency of the embodiment of the present invention;
Fig. 2 is the schematic flow sheet of the defining method of antenna index value in the embodiment of the present invention;
Fig. 3 is the schematic flow sheet of the defining method of the subcarrier index value at the descending pilot frequency place of antenna in the embodiment of the present invention;
Fig. 4 is the schematic flow sheet to the defining method of the concrete sequence of the subcarrier index value at every root antenna determination pilot tone place of each community in the embodiment of the present invention;
Fig. 5 is the schematic diagram of the sequence set that in the embodiment of the present invention, neighbor cell adopts;
Fig. 6 is that under channel measurement interval scene different in the embodiment of the present invention, the subcarrier index value of different antennae chooses schematic diagram;
Fig. 7 is the composition structural representation of the transmitting device of the descending pilot frequency of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the schematic flow sheet of the downlink pilot transmission method of the embodiment of the present invention, as shown in Figure 1, comprises the following steps:
Step 101: according to system parameters and preset rules determination sequence and random number.
Here, described system parameters comprises: antenna for base station total quantity, system maximum bandwidth.
Described resource index value comprises: antenna index value, subcarrier in frequency domain index value, time-domain symbol index value.
Described preset rules comprises: the antenna index value scope at described descending pilot frequency place covers all antennas;
The subcarrier index value scope at described descending pilot frequency place covers the bandwidth range of described system, i.e. subcarrier index value similar even value in the bandwidth range of system, the situation that in the little bandwidth avoiding appearing at scheduling, number of pilots is too rare;
In identical channel measurement interval, the determined described sequence in neighbor cell and random number not identical, namely the pilot tone place frequency domain position of every root antenna is not overlapping.
Step 102: send descending pilot frequency according to the resource index value of described sequence and random number determination descending pilot frequency.
Preferably, when described resource index value is antenna index value, described base station, according to system parameters and preset rules determination sequence and random number, according to the resource index value of described sequence and random number determination descending pilot frequency, comprising:
The length generating antenna index value random number sequence is determined according to antenna for base station total number;
The initial value of described random number sequence is determined according to preset rules; Wherein, described preset rules comprises: the antenna index value scope at described descending pilot frequency place covers all antennas;
Initial value cyclic shift according to described random number sequence generates multiple random number;
Described random number is defined as the antenna index value at descending pilot frequency place, wherein, the number of antennas at pilot tone place and the ratio of antenna for base station total number are less than the first predetermined threshold value.
Here, the number of the antenna at described pilot tone place is much smaller than described antenna for base station total number; Preferably, described first predetermined threshold value can be 1/4th, and namely described pilot tone place number of antennas can be only 1/4th of antenna for base station total number.Certainly, described first predetermined threshold value also can be other any number being less than 1.
In the present embodiment, the described initial value cyclic shift according to described random number sequence generates multiple random number can generate multiple random number according to the displacement of predetermined sequence regular cyclic, and described sequence is the sequence with incoherence, as m sequence, gold sequence etc.
Preferably, when described resource index value is subcarrier in frequency domain index value, described base station, according to system parameters and preset rules determination sequence and random number, according to the resource index value of described sequence and random number determination descending pilot frequency, comprising:
The length generating subcarrier index value random number sequence is determined according to system maximum bandwidth;
More than one sequence is determined according to described preset rules; Wherein, described preset rules comprises: the index range of the subcarrier at described descending pilot frequency place covers the bandwidth range of described system;
By described more than one sequence allocation to pilot tone place antenna in community and community, using the initial value of described sequence as random number sequence;
Initial value cyclic shift according to described random number sequence generates multiple random number; Wherein, in identical channel measurement time, multiple random numbers that the sequence of every root antenna configuration of neighbor cell generates are different;
Described random number is defined as the subcarrier index value at descending pilot frequency place, wherein, the subcarrier at pilot tone place is discontinuous and irregular distribution; And the total number of sub-carriers object ratio that the number of sub carrier wave at described pilot tone place and bandwidth comprise is less than the second predetermined threshold value.
Here, the number of the subcarrier at described pilot tone place is much smaller than the number of described subcarrier; The subcarrier at described pilot tone place is discontinuous and be irregularly distributed in described subcarrier; Preferably, described second predetermined threshold value can be 1/24th, and namely the number of sub carrier wave at described pilot tone place can be only total number of sub-carriers object 1/24th.Certainly, described second predetermined threshold value also can be other any number being less than 1.
Preferably, described by described more than one sequence allocation to pilot tone place antenna in community and community, comprising:
Described more than one sequence divided into groups, sequence set is dispensed to each community, the sequence set that adjacent Liang Ge community is distributed is different;
By described more than one sequence allocation in described sequence set to pilot tone place antenna in community, the sequence that described pilot tone place antenna is obtained is all different.
Concrete, base station is by community, signaling terminal place sequence set used, or base station and terminal are come implicitly to obtain this community sequence set used by cell ID (ID); The sequence set that the community of such as: pre-defined function name mod(community ID, 8)=1 is used is 1, mod(community ID, 8) sequence set that the community of the sequence set that the community of=2 is used is 2, mod(community ID, 8)=3 is used is 3.
Wherein, the quantity of described more than one sequence is determined according to the antenna amount sending pilot tone in adjacent cell quantity and each community.Such as: the number of antennas sending pilot tone in each community is M, and the adjacent cell quantity of community is 6, then the quantity of described more than one sequence is 7M.
Preferably, in different channel measurement time, when antenna is by time division way transmission pilot tone, can be the sequence that described antenna assignment is identical; Wherein, described channel measurement time interval comprises: at least one subframe, time slot or OFDM symbol.
The transmission method of the descending pilot frequency described in the embodiment of the present invention is applicable to a single aerial system in wide-band mobile communication, or centralized multiaerial system, or distributed multi-antenna system.Or the frequency-selective channel sparse for time delay domain or the sparse time-selective channel of Doppler domain; By the technical scheme that the embodiment of the present invention proposes, the empty frequency domain compression of pilot tone can be realized, and ensure that the pilot tone frequency domain position of any two antennas of neighbor cell or same community is all random distribution and can not collides in identical channel measurement interval, reach the object reducing pilot-frequency expense and AF panel simultaneously, improve the availability of frequency spectrum of system.
Fig. 2 is the schematic flow sheet of the defining method of antenna index value in the embodiment of the present invention, in the present embodiment, suppose that base station has 256 antennas, antenna index is 1,2 ..., 256, every root antenna can be used for sending pilot tone, but the technical scheme that the embodiment of the present invention provides only some antennas wherein sends pilot tone, in the embodiment of the present invention, choose 1/4th in 256 antennas and send pilot tone, namely 64 antennas send pilot tone, then the defining method of described 64 antennas as shown in Figure 2, comprises the following steps:
Step 201: according to the length of antenna total number or maximum antenna index value antenna determination random number sequence.
Here, because antenna total number or maximum antenna index value are 256, because the length binary number 11111111 that is 8 can represent the digital scope of 0 ~ 255, therefore represent antenna index by the random number sequence that length is 8.
Step 202: the initial value determining described random number sequence according to preset rules.
Here, described preset rules is that the antenna index value scope at descending pilot frequency place covers all antennas, namely similarly in 0 ~ 255 is uniformly distributed, and antenna is evenly distributed, concentrated not too much; For guaranteeing that determined antenna can cover all antenna ranges, the initial value of described random number sequence should be positioned at the centre of all antennas as far as possible, and in the present embodiment, the initial value of described random number sequence can be set as 00101000.
Step 203: the initial value cyclic shift according to described random number sequence generates random number.
Here, described predetermined sequence rule can be random sequence rule, as m sequence, gold sequence etc., the random number determination antenna index value that the m sequence that can be 8 according to length in the present embodiment generates successively, in the present embodiment, by the initial value 00101000 of described random number sequence, the random number that cyclic shift generates successively is 40,80,161,67 ...
Step 204: the random number of generation is defined as antenna index value.
In the present embodiment, the antenna index selected by non-conterminous community can be overlapping, and even identical, namely the initial value of the m sequence of all base stations can be all identical, or each base station is by the unified configuration of network side.
Can find out that the random number utilizing random sequence to generate that the embodiment of the present invention provides determines that the method for antenna index both ensure that antenna there will not be the situation of integrated distribution in spatial domain by the present embodiment, also can reach the object of Stochastic choice.
Fig. 3 is the schematic flow sheet of the defining method of the subcarrier index value at the descending pilot frequency place of antenna in the embodiment of the present invention, in the present embodiment, suppose that base station has 128 antennas, antenna index is 1,2 ..., 128, every root antenna can be used for sending pilot tone, but the technical scheme that provides of the embodiment of the present invention only some antennas wherein sends pilot tone, in the embodiment of the present invention, choose 1/4th in 128 antennas and send pilot tone, namely 32 antennas send pilot tone; The maximum bandwidth of supposing the system support is 20MHz, be equivalent to have 1200 subcarriers, in the embodiment of the present invention, choose 1/24th in 1200 subcarriers and send pilot tone, namely 50 subcarriers of base station only in 1200 subcarriers send pilot tone, its remaining sub-carriers sends data; Described 50 send the defining method of the sub-carrier indices of pilot tone as shown in Figure 3, comprise the following steps:
Step 301: according to the length of the maximum bandwidth determination subcarrier random number sequence that system is supported.
Here, maximum bandwidth due to system support is 20MHz, be equivalent to there are 1200 subcarriers, namely maximum sub-carrier indices is 1199, due to the binary number 11111111111 that length is 11, the digital scope of 0 ~ 2047 can be represented, therefore represent pilot sub-carrier index by the random number sequence that length is 11.
Step 302: determine more than one sequence according to preset rules, by described more than one sequence allocation to pilot tone place antenna in community and community, using described sequence as the initial value generating random number.
In the present embodiment, for the pilot sub-carrier index of any two antennas avoiding difference or neighbor cell can not overlap, namely pilot tone can not collide or produce interference, at least needs 7 × 32=224 bar random number sequence; The condition being selected 224 sequences 2048 random number sequences of 11 from length is: the random number generated during described 224 each cyclic shifts of random number sequence is different,
Step 303: every root antenna generates a series of random number according to described initial value cyclic shift.
Step 304: a series of random numbers generated are defined as the subcarrier index value at descending pilot frequency place by every root antenna.
Can be found out by the present embodiment, the subcarrier index value that can be met difference or pilot tone of any moment place, neighbor cell by above preset rules all can not be identical, namely the frequency domain position of pilot tone all can not collide, the subcarrier index value at pilot tone place is random and covers all Subcarrier range simultaneously, there will not be overstocked, avoid and intercept number of pilots situation very little in scheduling bandwidth 1.4MHz, affect the accuracy of channel measurement.
Fig. 4 is the schematic flow sheet to the defining method of the concrete sequence of the subcarrier index value at every root antenna determination pilot tone place of each community in the embodiment of the present invention; As shown in Figure 4, base station is after selecting more than one sequence satisfied condition, and need to distribute to each community and pilot tone place antenna, concrete distribution method comprises the following steps:
Step 401: more than determine one sequence is numbered, and described more than one sequence is divided into groups.
Here, the all sequences satisfied condition picked out is carried out predefine numbering, namely every bar sequence has and to number one to one, these sequences are divided into groups, packet mode is random, as long as ensure that the numbering comprised in each group can not be overlapping, and the number of each group of sequence comprised is more than or equal to the number of antennas selected by each community, the sequence that the antenna assignment one of namely sending pilot tone to every root is independent.
Such as, determine that altogether 224 sequences meet preset rules, described sequence be numbered 1,2 ..., 224, can be divided into 8 groups, the sequence numbering comprised in each sequence set can be as shown in table 1.
| Group number | The numbering comprised |
| 1 | 1，3，5，6，9，……220 |
| 2 | 2，7，10，14，……217 |
| 3 | 4，8，12，19，……223 |
| 4 | 13，16，18，24……214 |
| 5 | 22，25，31，……180 |
| 6 | 26，27，28，……170 |
| 7 | 32，34，35，…… |
| 8 | 80，84，94…… |
Table 1
Step 402: the sequence set that base station gives each cell configuration used.
Here, base station unification is to each cell configuration sequence set used, to ensure when configuration that neighbor cell sequence set used is not identical, then base station is by community, signaling terminal place sequence set used, or base station and terminal are implied by community ID and obtain this community sequence set used.
The sequence set that the community of such as: predefine mod(community ID, 8)=1 is used is 1, mod(community ID, 8) sequence set that the community of the sequence set that the community of=2 is used is 2, mod(community ID, 8)=3 is used is 3.
Such as, Fig. 5 is the schematic diagram of the sequence set that in the embodiment of the present invention, neighbor cell adopts, and configures the situation of the sequence set that certain adjacent 7 community adopts as shown in Figure 5.
Step 403: by described more than one sequence allocation in described sequence set to pilot tone place antenna in community, the sequence that described pilot tone place antenna is obtained is all different.
Preferably, after each community obtains sequence set, in community, the numbering in sequence set got successively by pilot tone place antenna according to antenna index order from small to large, can guarantee that the sequence of every root antenna at pilot tone place is all not identical like this.
Step 404: base station intercepts the pilot frequency sequence of corresponding length by system maximum bandwidth.
Above-mentioned sequence allocating method provided by the invention can be found out by the present embodiment, ensure that the sub-carrier indices at any two antenna pilot places of neighbor cell can not be identical, and utilize sequence generation random number to realize the randomized object of pilot tone frequency domain position.
Below in conjunction with embodiment, the whole process that in the embodiment of the present invention, pilot tone sends in pilot frequency locations is in a period of time described in further detail.
Before pilot tone sends, in a channel measurement interval, according to the random number that initiation sequence generates successively, base station determines that this community sends the subcarrier index value at pilot tone place on the antenna index value of pilot tone and every root antenna; Wherein, the selection of described initiation sequence will ensure that the random number generated covers whole antenna index or sub-carrier indices.Described determine to send pilot tone antenna index value and every root antenna on the method for subcarrier index value at pilot tone place as Fig. 2 to Fig. 4 method therefor, do not repeating herein.
Suppose the antenna determined in the present embodiment or antenna port index value for 1,5,9,17,24,36,42,56,78 ... 120}, in identical channel measurement time, the pilot tone between different antennae port can suppress interference by frequency division or the mode of time-division.
The sub-carrier indices namely selected of frequency division is different, and it is different that time-division and pilot tone send the OFDM symbol at place or time slot or subframe.
When adopting frequency division manner to suppress interference, be exactly in identical OFDM symbol, the sub-carrier indices at different antennae pilot tone place is determined according to this series of random numbers.Described employing frequency division manner suppresses to disturb the pilot sending method adopted to comprise the following steps:
Step 601: the maximum bandwidth value supported according to system and pilot-frequency expense, number of sub carrier wave namely shared by frequency domain generates the first pilot frequency sequence of corresponding length, and intercepts according to the system bandwidth of reality the second pilot frequency sequence that First ray obtains sending.
Such as, the maximum bandwidth of system support is 20MHz, and pilot-frequency expense is 1/24, and the length of the general pilot frequency sequence generated is 48.If real system bandwidth is 5MHz, only intercept the pilot frequency sequence in 5MHz from centre.
Step 602: described second pilot frequency sequence is mapped on the time-frequency location of the determined antenna of method provided by the invention.
Step 603: the frequency pilot sign mapped and other downlink datas are sent by antenna or antenna port by base station.
At different channel measurement intervals, the antenna selected by base station and sub-carrier indices group can by the multiplexing identical sequences of mode of time-division.Use antenna and sub-carrier indices in turn as far as possible, thus realize the randomized distribution of empty pilot tone position.
Such as, be the base station of 128 antennas for total number, the different antenna index selected by channel measurement interval can be as shown in table 2.
Table 2
Can find out, the antenna index of different base station selected by same channel Measuring Time can be overlapping, and the antenna selected by channel measurement interval that same base is different is as far as possible different, and selected antenna index is similar even value in 1 ~ 128.
For different channel measurement intervals, the situation that the sub-carrier indices of different antennae is chosen as shown in Figure 6.The index value of the subcarrier at different antennae pilot tone place is nonoverlapping, and pilot tone sparse random distribution in whole bandwidth, a series of random numbers that concrete index value generates according to the sequence of distributing are determined.In addition, in different channel measurement intervals, the index value of the subcarrier at different antennae pilot tone place can be identical.
Meanwhile, on the antenna that neighbor cell is different, the identical channel measurement interval that is distributed in of pilot tone also can not be overlapping, suppresses the interference between pilot tone.
Fig. 7 is the composition structural representation of the transmitting device of the descending pilot frequency of the embodiment of the present invention, and the transmitting device of the descending pilot frequency described in the embodiment of the present invention is applied to base station; As described in Figure 7, described device comprises: configuration module 71, resource determination module 72 and transport module 73; Wherein,
Described configuration module 71, for according to system parameters and preset rules configuration sequence, and generates random number according to described sequence, described sequence and random number is sent to resource determination module 72;
Described resource determination module 72, for the resource index value of the sequence that sends according to described configuration module 71 and random number determination descending pilot frequency;
Described transport module 73, sends descending pilot frequency for the resource index value determined according to described resource determination module 72.
Preferably, described configuration module 71, for determining the length generating antenna index value random number sequence according to antenna for base station total number; The initial value of described random number sequence is determined according to preset rules; Initial value cyclic shift according to described random number sequence generates multiple random number; Wherein, described preset rules comprises: the antenna index value scope at described descending pilot frequency place covers all antennas;
Described resource determination module 72, for described random number being defined as the antenna index value at descending pilot frequency place, wherein, the number of antennas at pilot tone place and the ratio of antenna for base station total number are less than the first predetermined threshold value.
Preferably, described configuration module 71, for determining the length generating subcarrier index value random number sequence according to system maximum bandwidth; More than one sequence is determined according to described preset rules; By described more than one sequence allocation to pilot tone place antenna in community and community, using the initial value of described sequence as random number sequence; Initial value cyclic shift according to described random number sequence generates multiple random number; Wherein, described preset rules comprises: the index range of the subcarrier at described descending pilot frequency place covers the bandwidth range of described system; In identical channel measurement time, multiple random numbers that the sequence of every root antenna configuration of neighbor cell generates are different;
Described resource determination module 72, for described random number being defined as the subcarrier index value at descending pilot frequency place, wherein, the subcarrier at pilot tone place is discontinuous and irregular distribution; The total number of sub-carriers object ratio that the number of sub carrier wave at described pilot tone place and bandwidth comprise is less than the second predetermined threshold value.
Preferably, described configuration module 71, also for described more than one sequence being divided into groups, is dispensed to each community by sequence set, and the sequence set that adjacent Liang Ge community is distributed is different; By described more than one sequence allocation in described sequence set to pilot tone place antenna in community, the sequence that described pilot tone place antenna is obtained is all different.
Preferably, described configuration module 71, also in different channel measurement time, when antenna distributes identical sequence by during time division way transmission pilot tone; Wherein, described channel measurement time interval comprises: at least one subframe, time slot or OFDM symbol.
Those skilled in the art are to be understood that, the function of each processing module in the transmitting device of the descending pilot frequency of the embodiment of the present invention, can refer to the associated description of the transmission method of aforementioned descending pilot frequency and understand, each processing module in the transmitting device of the descending pilot frequency of the embodiment of the present invention, realizing by realizing the analog circuit of the function described in the embodiment of the present invention, also can be realized by the operation of the software of the function of execution described in the embodiment of the present invention on intelligent terminal.
Wherein, the transmitting device of described descending pilot frequency is applied in base station, configuration module 71 in described device and resource determination module 72, can be realized by the central processing unit (CPU, CentralProcessing Unit) in base station or digital signal processor (DSP, Digital Signal Processor) or programmable gate array (FPGA, Field-Programmable Gate Array) in actual applications; Transport module 73 in described device, can be realized by the transmit antenna in base station in actual applications.
The embodiment of the present invention is descending for LTE, devise in maximum bandwidth for multiple antennas, multiple cell, different channels measures interval, the pilot frequency locations of the empty frequency-domain sparse random distribution of different pilot tone pattern-different, and ensure that in identical channel measurement interval, between different districts and antenna, the frequency domain position at pilot tone place is all not identical, thus reaches the object of AF panel.
Simultaneously, as can be seen from above-mentioned all embodiments, the transmission method of a kind of descending pilot frequency provided by the present invention solves the problem that in large-scale multi-antenna system, original pilot-frequency expense is large, and the new channel information acquisition method proposed for the transmission of Massive aerial array can be applicable to, finally improve the availability of frequency spectrum and the throughput of system further.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of hardware embodiment, software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (13)
1. a transmission method for descending pilot frequency, is characterized in that, described method comprises:
According to system parameters and preset rules configuration sequence, and generate random number according to described sequence;
Send descending pilot frequency according to the resource index value of described sequence and described random number determination descending pilot frequency.
2. method according to claim 1, is characterized in that, described system parameters comprises: antenna for base station total quantity, system maximum bandwidth.
3. method according to claim 1, is characterized in that, described resource index value comprises: antenna index value, subcarrier in frequency domain index value, time-domain symbol index value.
4. the method according to any one of claims 1 to 3, is characterized in that, described according to system parameters and preset rules configuration sequence and generate random number, according to the resource index value of described sequence and random number determination descending pilot frequency, comprising:
The length generating antenna index value random number sequence is determined according to antenna for base station total number;
The initial value of described random number sequence is determined according to preset rules; Wherein, described preset rules comprises: the antenna index value scope at described descending pilot frequency place covers all antennas;
Initial value cyclic shift according to described random number sequence generates multiple random number;
Described random number is defined as the antenna index value at descending pilot frequency place, wherein, the number of antennas at pilot tone place and the ratio of antenna for base station total number are less than the first predetermined threshold value.
5. the method according to any one of claims 1 to 3, is characterized in that, described according to system parameters and preset rules configuration sequence and generate random number, according to the resource index value of described sequence and random number determination descending pilot frequency, comprising:
The length generating subcarrier index value random number sequence is determined according to system maximum bandwidth;
More than one sequence is determined according to described preset rules; Wherein, described preset rules comprises: the index range of the subcarrier at described descending pilot frequency place covers the bandwidth range of described system;
By described more than one sequence allocation to pilot tone place antenna in community and community, using the initial value of described sequence as random number sequence;
Initial value cyclic shift according to described random number sequence generates multiple random number; Wherein, in identical channel measurement time, multiple random numbers that the sequence of every root antenna configuration of neighbor cell generates are different;
Described random number is defined as the subcarrier index value at descending pilot frequency place, wherein, the subcarrier at pilot tone place is discontinuous and irregular distribution; And the total number of sub-carriers object ratio that the number of sub carrier wave at described pilot tone place and bandwidth comprise is less than the second predetermined threshold value.
6. method according to claim 5, is characterized in that, described by described more than one sequence allocation to pilot tone place antenna in community and community, comprising:
Described more than one sequence divided into groups, sequence set is dispensed to each community, the sequence set that adjacent Liang Ge community is distributed is different;
By described more than one sequence allocation in described sequence set to pilot tone place antenna in community, the sequence that described pilot tone place antenna is obtained is all different.
7. the method according to claim 5 or 6, is characterized in that, the quantity of described more than one sequence is determined according to the antenna amount sending pilot tone in adjacent cell quantity and each community.
8. method according to claim 5, is characterized in that, described method also comprises: in different channel measurement time, when antenna is by time division way transmission pilot tone, is the sequence that described antenna assignment is identical; Wherein, described channel measurement time interval comprises: at least one subframe, time slot or orthogonal frequency division multiplex OFDM symbol.
9. a transmitting device for descending pilot frequency, is characterized in that, described device comprises: configuration module, resource determination module and transport module; Wherein,
Described configuration module, for according to system parameters and preset rules configuration sequence, and generates random number according to described sequence, described sequence and random number is sent to resource determination module;
Described resource determination module, for the resource index value of the sequence that sends according to described configuration module and random number determination descending pilot frequency;
Described transport module, sends descending pilot frequency for the resource index value determined according to described resource determination module.
10. device according to claim 9, is characterized in that, described configuration module, for determining the length generating antenna index value random number sequence according to antenna for base station total number; The initial value of described random number sequence is determined according to preset rules; Initial value cyclic shift according to described random number sequence generates multiple random number; Wherein, described preset rules comprises: the antenna index value scope at described descending pilot frequency place covers all antennas;
Described resource determination module, for described random number being defined as the antenna index value at descending pilot frequency place, wherein, the number of antennas at pilot tone place and the ratio of antenna for base station total number are less than the first predetermined threshold value.
11. devices according to claim 9, is characterized in that, described configuration module, for determining the length generating subcarrier index value random number sequence according to system maximum bandwidth; More than one sequence is determined according to described preset rules; By described more than one sequence allocation to pilot tone place antenna in community and community, using the initial value of described sequence as random number sequence; Initial value cyclic shift according to described random number sequence generates multiple random number; Wherein, described preset rules comprises: the index range of the subcarrier at described descending pilot frequency place covers the bandwidth range of described system; In identical channel measurement time, multiple random numbers that the sequence of every root antenna configuration of neighbor cell generates are different;
Described resource determination module, for described random number being defined as the subcarrier index value at descending pilot frequency place, wherein, the subcarrier at pilot tone place is discontinuous and irregular distribution; The total number of sub-carriers object ratio that the number of sub carrier wave at described pilot tone place and bandwidth comprise is less than the second predetermined threshold value.
12. devices according to claim 11, is characterized in that, described configuration module, also for described more than one sequence being divided into groups, sequence set are dispensed to each community, and the sequence set that adjacent Liang Ge community is distributed is different; By described more than one sequence allocation in described sequence set to pilot tone place antenna in community, the sequence that described pilot tone place antenna is obtained is all different.
13. devices according to claim 11, is characterized in that, described configuration module, also in different channel measurement time, when antenna distributes identical sequence by during time division way transmission pilot tone; Wherein, described channel measurement time interval comprises: at least one subframe, time slot or orthogonal frequency division multiplex OFDM symbol.
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| CN201310676444.2A CN104717659B (en) | 2013-12-11 | 2013-12-11 | A kind of transmission method and device of descending pilot frequency |
| PCT/CN2014/077804 WO2014187294A1 (en) | 2013-12-11 | 2014-05-19 | Method, apparatus and computer storage media for transmitting downlink pilot |
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Also Published As
| Publication number | Publication date |
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| WO2014187294A1 (en) | 2014-11-27 |
| CN104717659B (en) | 2019-08-30 |
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