CN104717659B - A kind of transmission method and device of descending pilot frequency - Google Patents
A kind of transmission method and device of descending pilot frequency Download PDFInfo
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- CN104717659B CN104717659B CN201310676444.2A CN201310676444A CN104717659B CN 104717659 B CN104717659 B CN 104717659B CN 201310676444 A CN201310676444 A CN 201310676444A CN 104717659 B CN104717659 B CN 104717659B
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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
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The embodiment of the invention discloses a kind of transmission methods of descending pilot frequency, which comprises generates random number according to system parameter and preset rules configuration sequence, and according to the sequence；The resource index value of descending pilot frequency is determined according to the sequence and the random number and sends descending pilot frequency.The embodiment of the present invention also discloses a kind of transmitting device of descending pilot frequency simultaneously.
Description
Technical field
The present invention relates to pilot transmission techniques, and in particular to a kind of transmission method and device of descending pilot frequency.
Background technique
With the rapid growth of mobile communication business flow demand, the following B4G/5G mobile communication system will be in face of more wide
General demand, the use of advanced multi-antenna technology and channel self-adapting technology etc. has made system in 4G mobile communication standard
Spectrum efficiency has approached channel capacity.Realize above-mentioned target, it is necessary to adjust, and be found newly to traditional network architecture
Radio resource growth point.The miniaturization and isomerization of cell are the trend of future wireless network development, that is, by shortening eventually
The distance between end and access point, can reduce the path loss of signal, the spectrum efficiency and power efficiency of system can be improved；
There are also be exactly by configuring more massive aerial array come lifting system capacity and covering.
One of nearly 2 years popular research directions risen i.e. extensive (Massive) antenna based on big dimension antenna alignment
Array technique is capable of the radio resource of depth excavation and utilization space, theoretically can significantly improve the spectrum efficiency of system
And power efficiency.But some new characteristics will be presented in the transmission of Massive aerial array, such as: channel will tool in spatial distribution
There is apparent sparsity；Big array beams can almost eliminate the influence of noise, but co-channel interference caused by pilot pollution etc.
Principal element as system for restricting performance.
In face of above-mentioned feature, the novel Massive aerial array transmission technology of high efficient and reliable is designed, it is necessary first to
Solve the problems, such as the acquisition of receiving side channel information.
Currently, resource is with airspace-antenna or day in long term evolution (LTE, Long Term Evolution) system
What line end mouth, time domain and frequency domain three-dimensional distinguished.Wherein, descending pilot frequency is all equally distributed on frequency domain, for example is used for
The two neighboring pilot tone symbol of the measurement pilot tone (CRS, Cell-specific reference signals) that channel state information obtains
Number subcarrier spacing be 6, channel state information reference signals (CSI-RS, Channel-State Information
Reference Signals) subcarrier spacing of two neighboring frequency pilot sign is 12, and every antenna is required to send and be led
Frequently.
In extensive antenna multiple-input, multiple-output (MIMO, Multiple-Input Multiple-Output) skill based on LTE
It is even more since base station side is configured with large-scale antenna array, such as more than 100 antennas in art, if according to current association
View requires to need all to send pilot tone in every antenna, and sub-carrier positions shared by pilot tone are mapped by existing protocol, pilot-frequency expense
Will be bigger, seriously affect the data transfer rate and spectrum efficiency of system.It is obtained to reduce Massive aerial array for channel information
The expense of the reference signal taken, new channel state information acquisition method (such as based on compressed sensing or space interpolation etc.) is
It is suggested.But there is presently no propose efficient downlink that is having low overhead and can be suitably used for above-mentioned channel information acquisition method
The solution of the transmission method of pilot tone.
Summary of the invention
To solve existing technical problem, the embodiment of the present invention provides the transmission method and dress of a kind of descending pilot frequency
It sets, guarantees that the pilot tone frequency domain position of any two antennas of neighboring community or same cell is random distribution and will not touch
It hits, can be realized the compression of pilot tone null tone domain, the availability of frequency spectrum of lifting system.
In order to achieve the above objectives, the technical solution 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, which comprises
Random number is generated according to system parameter and preset rules configuration sequence, and according to the sequence；
The resource index value of descending pilot frequency is determined according to the sequence and the random number and sends descending pilot frequency.
In above scheme, the system parameter includes: antenna for base station total quantity, system maximum bandwidth.
In above scheme, the resource index value includes: antenna index value, subcarrier in frequency domain index value, time-domain symbol rope
Draw value.
In above scheme, it is described according to system parameter and preset rules configuration sequence and generate random number, according to the sequence
Column and random number determine the resource index value of descending pilot frequency, comprising:
The length for generating antenna index value random number sequence is determined according to antenna for base station total number；
The initial value of the random number sequence is determined according to preset rules；Wherein, the preset rules include: the downlink
Antenna index value range where pilot tone covers all antennas；
Multiple random numbers are generated according to the initial value cyclic shift of the random number sequence；
The antenna index value random number being determined as where descending pilot frequency, wherein number of antennas where pilot tone with
The ratio of antenna for base station total number is less than the first preset threshold.
In above scheme, it is described according to system parameter and preset rules configuration sequence and generate random number, according to the sequence
Column and random number determine the resource index value of descending pilot frequency, comprising:
The length for generating subcarrier index value random number sequence is determined according to system maximum bandwidth；
More than one sequence is determined according to the preset rules；Wherein, the preset rules include: the descending pilot frequency institute
The index range of subcarrier cover the bandwidth range of the system；
One above sequence is distributed into antenna where pilot tone in cell and cell, using the sequence as random number
The initial value of sequence；
Multiple random numbers are generated according to the initial value cyclic shift of the random number sequence；Wherein, it is surveyed in identical channel
It measures in the time, multiple random numbers that the sequence of every antenna configuration of neighboring community generates are different；
The subcarrier index value random number being determined as where descending pilot frequency, wherein the subcarrier where pilot tone is
Discontinuous and irregular distribution；And the total number of sub-carriers purpose ratio that the number of sub carrier wave where the pilot tone and bandwidth include is small
In the second preset threshold.
It is described that one above sequence is distributed into antenna where pilot tone in cell and cell in above scheme, comprising:
One above sequence is grouped, sequence component is assigned to each cell, divides two neighboring cell
The sequence group matched is different；
One above sequence in the sequence group is distributed into antenna where pilot tone in cell, makes the pilot tone institute
It is all different in the sequence that antenna obtains.
In above scheme, the quantity of one above sequence is according to transmission pilot tone in adjacent cell quantity and each cell
Antenna amount determines.
In above scheme, the method also includes: in different channel measurement times, when antenna is passed by time division way
It is the identical sequence of the antenna assignment when transporting frequency；Wherein, the channel measurement time interval include: at least one subframe,
Time slot or orthogonal frequency division multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) symbol.
The embodiment of the present invention also provides a kind of transmitting device of descending pilot frequency, and described device includes: that configuration module, resource are true
Cover half block and transmission module；Wherein,
The configuration module, for according to system parameter and preset rules configuration sequence, and according to the sequence generate with
The sequence and random number are sent to resource determination module by machine number；
The resource determination module, sequence and random number for being sent according to the configuration module determine descending pilot frequency
Resource index value；
The transmission module, the resource index value for being determined according to the resource determination module send descending pilot frequency.
In above scheme, the configuration module, for determining that generation antenna index value is random according to antenna for base station total number
The length of Number Sequence；The initial value of the random number sequence is determined according to preset rules；According to the initial of the random number sequence
It is worth cyclic shift and generates multiple random numbers；Wherein, the preset rules include: the antenna index value model where the descending pilot frequency
Enclose all antennas of covering；
The resource determination module, the antenna index value for being determined as the random number where descending pilot frequency, wherein
The ratio of number of antennas and antenna for base station total number where pilot tone is less than the first preset threshold.
In above scheme, the configuration module, for determining that generation subcarrier index value is random according to system maximum bandwidth
The length of Number Sequence；More than one sequence is determined according to the preset rules；By one above sequence distribute to cell and
Antenna where pilot tone in cell, using the sequence as the initial value of random number sequence；According to the initial of the random number sequence
It is worth cyclic shift and generates multiple random numbers；Wherein, the preset rules include: the index of the subcarrier where the descending pilot frequency
Range covers the bandwidth range of the system；In identical channel measurement time, the sequence of every antenna configuration of neighboring community
Multiple random numbers of column-generation are different；
The resource determination module, the subcarrier index value for being determined as the random number where descending pilot frequency,
In, the subcarrier where pilot tone is for discontinuous and irregular distribution；Number of sub carrier wave and bandwidth packet where the pilot tone
The total number of sub-carriers purpose ratio contained is less than the second preset threshold.
In above scheme, the configuration module is also used to for one above sequence being grouped, sequence group is distributed
To each cell, the sequence group for distributing two neighboring cell is different；By one above sequence in the sequence group
It is all different to distribute to antenna where pilot tone, the sequence that antenna where making the pilot tone obtains in cell.
In above scheme, the configuration module is also used in different channel measurement times, when antenna passes through time-division side
Formula distributes identical sequence when transmitting pilot tone；Wherein, the channel measurement time interval include: at least one subframe, time slot or
Person's OFDM symbol.
The transmission method and device of descending pilot frequency provided in an embodiment of the present invention are configured according to system parameter and preset rules
Sequence, and random number is generated according to the sequence；The resource index of descending pilot frequency is determined according to the sequence and the random number
It is worth and sends descending pilot frequency；In this way, realizing the compression of pilot tone null tone domain, and guarantee any the two of neighboring community or same cell
The pilot tone frequency domain position of root antenna is random distribution and will not collide, while reaching reduction pilot-frequency expense and AF panel
Purpose, improve the availability of frequency spectrum of system.
Detailed description of the invention
Fig. 1 is the flow diagram of the transmission method of the descending pilot frequency of the embodiment of the present invention；
Fig. 2 is the flow diagram of the determination method of antenna index value in the embodiment of the present invention；
Fig. 3 is that the process of the determination method of the subcarrier index value in the embodiment of the present invention where the descending pilot frequency of antenna is shown
It is intended to；
Fig. 4 is the tool for determining the subcarrier index value where pilot tone in the embodiment of the present invention to every antenna of each cell
The flow diagram of the determination method of body sequence；
Fig. 5 is the schematic diagram for the sequence group that neighboring community uses in the embodiment of the present invention；
Fig. 6 is that the subcarrier index value of different antennae under channel measurement interval scene different in the embodiment of the present invention is chosen
Schematic diagram；
Fig. 7 is the composed structure schematic diagram of the transmitting device of the descending pilot frequency of the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in further detail.
Fig. 1 is the flow diagram of the downlink pilot transmission method of the embodiment of the present invention, as shown in Figure 1, including following step
It is rapid:
Step 101: determining sequence and random number according to system parameter and preset rules.
Here, the system parameter includes: antenna for base station total quantity, system maximum bandwidth.
The resource index value includes: antenna index value, subcarrier in frequency domain index value, time-domain symbol index value.
The preset rules include: all antennas of antenna index value range covering where the descending pilot frequency；
Subcarrier index value range where the descending pilot frequency covers the bandwidth range of the system, i.e. sub-carrier indices
Value similar uniform value in the bandwidth range of system, avoids the occurrence of the feelings that number of pilots is excessively rare in the small bandwidth of scheduling
Condition；
In identical channel measurement interval, the sequence and random number determined by neighboring community are different from, i.e., often
Frequency domain position where the pilot tone of root antenna is not overlapped.
Step 102: the resource index value of descending pilot frequency being determined according to the sequence and random number and sends descending pilot frequency.
Preferably, when the resource index value is antenna index value, the base station is according to system parameter and preset rules
It determines sequence and random number, the resource index value of descending pilot frequency is determined according to the sequence and random number, comprising:
The length for generating antenna index value random number sequence is determined according to antenna for base station total number；
The initial value of the random number sequence is determined according to preset rules；Wherein, the preset rules include: the downlink
Antenna index value range where pilot tone covers all antennas；
Multiple random numbers are generated according to the initial value cyclic shift of the random number sequence；
The antenna index value random number being determined as where descending pilot frequency, wherein number of antennas where pilot tone with
The ratio of antenna for base station total number is less than the first preset threshold.
Here, the number of the antenna where the pilot tone is much smaller than the antenna for base station total number；Preferably, described first
Preset threshold can be a quarter, i.e., number of antennas where the described pilot tone can be only a quarter of antenna for base station total number.
Certainly, first preset threshold can also be other any numbers less than 1.
In the present embodiment, it is described multiple random numbers are generated according to the initial value cyclic shift of the random number sequence can basis
The displacement of predetermined sequence regular cyclic generates multiple random numbers, and the sequence is the sequence with incoherence, such as m-sequence, gold
Sequence etc..
Preferably, when the resource index value is subcarrier in frequency domain index value, the base station is according to system parameter and in advance
If rule determines sequence and random number, the resource index value of descending pilot frequency is determined according to the sequence and random number, comprising:
The length for generating subcarrier index value random number sequence is determined according to system maximum bandwidth；
More than one sequence is determined according to the preset rules；Wherein, the preset rules include: the descending pilot frequency institute
The index range of subcarrier cover the bandwidth range of the system；
One above sequence is distributed into antenna where pilot tone in cell and cell, using the sequence as random number
The initial value of sequence；
Multiple random numbers are generated according to the initial value cyclic shift of the random number sequence；Wherein, it is surveyed in identical channel
It measures in the time, multiple random numbers that the sequence of every antenna configuration of neighboring community generates are different；
The subcarrier index value random number being determined as where descending pilot frequency, wherein the subcarrier where pilot tone is
Discontinuous and irregular distribution；And the total number of sub-carriers purpose ratio that the number of sub carrier wave where the pilot tone and bandwidth include is small
In the second preset threshold.
Here, the number of the subcarrier where the pilot tone is much smaller than the number of the subcarrier；Where the pilot tone
Subcarrier is discontinuous and irregular is distributed in the subcarrier；Preferably, second preset threshold can be 24
/ mono-, i.e., the number of sub carrier wave where the described pilot tone can be only 20 a quarter of total number of sub-carriers purpose.Certainly, described
Second preset threshold can also be other any numbers less than 1.
It is preferably, described that one above sequence is distributed into antenna where pilot tone in cell and cell, comprising:
One above sequence is grouped, sequence component is assigned to each cell, divides two neighboring cell
The sequence group matched is different；
One above sequence in the sequence group is distributed into antenna where pilot tone in cell, makes the pilot tone institute
It is all different in the sequence that antenna obtains.
Specifically, base station can be passed through by sequence group or base station used in cell where signaling terminal and terminal
Cell ID (ID) Lai Yinhan obtains sequence group used in this cell；Such as: pre-defined function name mod(cell ID, 8)=1
Sequence group used in cell is 1, mod(cell ID, 8) sequence group used in=2 cell is 2, mod(cell ID, 8)=3 small
Sequence group used in area is 3.
Wherein, the quantity of one above sequence is according to the antenna number for sending pilot tone in adjacent cell quantity and each cell
Amount determines.Such as: the number of antennas that pilot tone is sent in each cell is M, and the adjacent cell quantity of cell is 6, then it is one with
The quantity of upper sequence is 7M.
It preferably, can be described when antenna transmits pilot tone by time division way in different channel measurement times
The identical sequence of antenna assignment；Wherein, the channel measurement time interval includes: at least one subframe, time slot or OFDM symbol
Number.
Single antenna system of the transmission method of descending pilot frequency described in the embodiment of the present invention suitable for wide-band mobile communication
System, 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；The technical solution proposed through the embodiment of the present invention is able to achieve pilot tone null tone
Domain compression, and guarantee neighboring community or same cell any two antennas pilot tone frequency domain position in identical channel measurement
All it is random distribution and will not collides in interval, while achieving the purpose that reduce pilot-frequency expense and AF panel, is promoted
The availability of frequency spectrum of system.
Fig. 2 is the flow diagram of the determination method of antenna index value in the embodiment of the present invention, in this example, it is assumed that
Base station shares 256 antennas, antenna index 1,2 ..., 256, every antenna may serve to send pilot tone, but the present invention
The technical solution that embodiment provides only sends pilot tone on some antennas wherein, in the embodiment of the present invention, chooses 256 antennas
In a quarter send pilot tone, i.e. 64 antennas send pilot tones, then the determination method of 64 antennas is as shown in Fig. 2, packet
Include following steps:
Step 201: the length of random number sequence is determined according to antenna total number or maximum antenna index value antenna.
Here, since antenna total number or maximum antenna index value are 256, due to length be 8 binary number
11111111 can indicate 0~255 digital scope, therefore indicate antenna index with the random number sequence that length is 8.
Step 202: the initial value of the random number sequence is determined according to preset rules.
Here, the preset rules are that the antenna index value range where descending pilot frequency covers all antennas, i.e., 0~
It is similar in 255 to be uniformly distributed, so that antenna is evenly distributed, not undue concentration；To ensure that identified antenna can cover all antennas
The initial value of range, the random number sequence should be as far as possible in the centre of all antennas, the present embodiment, the random number sequence
Initial value may be set to 00101000.
Step 203: random number is generated according to the initial value cyclic shift of the random number sequence.
Here, the predetermined sequence rule can be random sequence rule, such as m-sequence, gold sequence, in the present embodiment
The random number that sequentially generates of m-sequence that can be 8 according to length determine antenna index value, in the present embodiment, pass through the random number
The initial value 00101000 of sequence, the random number that cyclic shift sequentially generates are 40,80,161,67 ....
Step 204: the random number of generation is determined as antenna index value.
In the present embodiment, the non-conterminous selected antenna index of cell can be overlapped or even identical, i.e., all bases
The initial value of the m-sequence at station can all be that identical or each base station is configured by network side is unified.
Through this embodiment it can be seen that the random number provided in an embodiment of the present invention generated using random sequence is determined
The method of antenna index both ensure that antenna the case where spatial domain is not in integrated distribution, can also reach randomly selected mesh
's.
Fig. 3 is that the process of the determination method of the subcarrier index value in the embodiment of the present invention where the descending pilot frequency of antenna is shown
Be intended to, in this example, it is assumed that base station shares 128 antennas, antenna index 1,2 ..., 128, every antenna is ok
For sending pilot tone, but technical solution provided in an embodiment of the present invention only sends pilot tone on some antennas wherein, the present invention
In embodiment, chooses a quarter in 128 antennas and send pilot tone, is i.e. 32 antennas send pilot tone；Assuming that system was supported
Maximum bandwidth is 20MHz, is equivalent to and shares 1200 subcarriers, in the embodiment of the present invention, chooses two in 1200 subcarriers
Ten a quarters send pilot tone, i.e. base station only sends pilot tone, remaining sub-carriers on 50 subcarriers in 1200 subcarriers
Send data；The determination method of the sub-carrier indices of 50 transmissions pilot tone is as shown in Figure 3, comprising the following steps:
Step 301: the length of subcarrier random number sequence is determined according to the maximum bandwidth that system is supported.
Here, since the maximum bandwidth that system is supported is 20MHz, 1200 subcarriers have been equivalent to, i.e., maximum subcarrier
Index is 1199, due to the binary number 11111111111 that length is 11, can indicate 0~2047 digital scope, therefore use
The random number sequence that length is 11 indicates pilot sub-carrier index.
Step 302: determining more than one sequence according to preset rules, one above sequence is distributed into cell and small
Antenna where pilot tone in area, using the sequence as the initial value for generating random number.
In the present embodiment, to avoid the pilot sub-carrier index of any two antennas of different or neighboring community from not occurring
Overlapping, i.e., pilot tone will not collide or generate interference, at least need 7 × 32=224 random number sequences；It is 11 from length
The condition of 224 sequences is selected in 2048 random number sequences are as follows: generate when each cyclic shift of 224 random number sequences
Random number be different,
Step 303: every antenna generates a series of random numbers according to the initial value cyclic shift.
Step 304: a series of random numbers of generation are determined as the subcarrier index value where descending pilot frequency by every antenna.
It is led at any moment as can be seen that can satisfy different or neighboring community by the above preset rules through this embodiment
Subcarrier index value where frequency all will not be identical, i.e., the frequency domain position of pilot tone will not all collide, while where pilot tone
Subcarrier index value is random and all Subcarrier ranges of covering, be not in it is overstocked, avoid interception scheduling bandwidth
The very little situation of number of pilots in 1.4MHz, influences the accuracy of channel measurement.
Fig. 4 is the tool for determining the subcarrier index value where pilot tone in the embodiment of the present invention to every antenna of each cell
The flow diagram of the determination method of body sequence；As shown in figure 4, base station is after selecting more than one sequence of the condition of satisfaction,
Antenna where needing to distribute to each cell and pilot tone, specific distribution method the following steps are included:
Step 401: more than one determining sequence being numbered, and one above sequence is grouped.
Here, all sequences for meeting condition that will be singled out carry out predefined number, i.e. every sequence has a pair
The number answered is grouped these sequences, and packet mode is random, as long as guaranteeing that the number for including in each group cannot be overlapped i.e.
Can, and the item number of each group of sequence for including is more than or equal to the selected number of antennas of each cell, i.e., to every transmission pilot tone
One individual sequence of antenna assignment.
For example, determine that 224 sequences meet preset rules altogether, the number of the sequence is 1,2 ..., 224, can be with
It is divided into 8 groups, the sequence number for including in each sequence group can be as shown in table 1.
| Group number | The number for including |
| 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 base station sequence group used to the configuration of each cell.
Here, the unified sequence group used to the configuration of each cell in base station, configuration when, will guarantee used in neighboring community
Sequence group be it is different, then base station, which passes through, signals sequence group or base station and end used in cell where terminal
End obtains sequence group used in this cell by cell ID come implicit.
Such as: cell sequence group used in cell predefined mod(cell ID, 8)=1 is 1, mod(cell ID, 8)=2
Sequence group used is 2, mod(cell ID, 8) sequence group used in=3 cell is 3.
For example, Fig. 5 is the schematic diagram for the sequence group that neighboring community uses in the embodiment of the present invention, configure certain adjacent 7 small
The case where sequence group used by area, is as shown in Fig. 5.
Step 403: one above sequence in the sequence group being distributed into antenna where pilot tone in cell, makes institute
The sequence that antenna where stating pilot tone obtains is all different.
Preferably, after each cell obtains sequence group, in cell antenna where pilot tone according to antenna index from small to large
Sequence successively takes the number in sequence group, may insure that the sequence of every antenna where pilot tone is all different in this way.
Step 404: base station intercepts the pilot frequency sequence of corresponding length by system maximum bandwidth.
Through this embodiment it can be seen that above-mentioned sequence allocating method provided by the invention, ensure that any of neighboring community
Sub-carrier indices where two antenna pilots will not be identical, and using sequence generate random number realize pilot tone frequency domain position with
The purpose of machine.
Below with reference to embodiment in the embodiment of the present invention in a period of time pilot tone send in pilot frequency locations it is entire
Process is described in further detail.
Before pilot tone transmission, in a channel measurement interval, random number that base station is sequentially generated according to initiation sequence
Determine that this cell sends the subcarrier index value in the antenna index value and every antenna of pilot tone where pilot tone；Wherein, described first
The selection of beginning sequence will guarantee that the random number generated covers entire antenna index or sub-carrier indices.The determining transmission pilot tone
Method such as Fig. 2 of subcarrier index value in antenna index value and every antenna where pilot tone does not exist herein to Fig. 4 method therefor
It repeats.
Assuming that in the present embodiment determine antenna or antenna port index value be 1,5,9,17,24,36,42,56,
78 ... ... 120 }, in identical channel measurement time, the pilot tone between different antennae port can pass through frequency division or the side of time-division
Formula inhibits to interfere.
Frequency division, that is, selection sub-carrier indices are different, OFDM symbol or time slot or son where time-division, that is, pilot tone transmission
Frame is different.
It is exactly the son in identical OFDM symbol, where different antennae pilot tone when inhibiting interference using frequency division manner
Carrier index is determined according to this series of random numbers.It is described that pilot sending method packet used by interfering is inhibited using frequency division manner
Include following steps:
Step 601: the maximum bandwidth value and pilot-frequency expense supported according to system, i.e. number of sub carrier wave shared by frequency domain generate
First pilot frequency sequence of corresponding length, and the second pilot tone sequence to be sent is obtained according to actual system bandwidth interception First ray
Column.
For example, the maximum bandwidth that system is supported is 20MHz, pilot-frequency expense 1/24, the length of the pilot frequency sequence probably generated
Degree is 48.If real system bandwidth is 5MHz, only from the pilot frequency sequence in taken intermediate 5MHz.
Step 602: second pilot frequency sequence is mapped to the time-frequency position of antenna determined by method provided by the invention
It sets.
Step 603: base station sends the frequency pilot sign mapped and other downlink datas by antenna or antenna port
It goes out.
At different channel measurement intervals, the selected antenna in base station and sub-carrier indices group can be by way of the time-divisions
It is multiplexed identical sequence.Antenna and sub-carrier indices are used in turn as far as possible, to realize the randomization point of null tone domain pilot frequency locations
Cloth.
For example, being the base station of 128 antennas for total number, the different selected antenna index in channel measurement interval can
With as shown in table 2.
Table 2
As can be seen that different base station selected antenna index in same channel time of measuring can be overlapped, identical base
The selected antenna in channel measurement interval for standing different is different as far as possible, and selected antenna index is similar in 1~128 uniformly to be taken
Value.
For different channel measurement intervals, the case where sub-carrier indices of different antennae are chosen, is as shown in Fig. 6.It is different
The index value of subcarrier where antenna pilot is nonoverlapping, and pilot tone sparse random distribution in whole bandwidth, specific rope
Draw value according to a series of random numbers that the sequence of distribution generates to determine.In addition, in different channel measurement intervals, different antennae
The index value of subcarrier where pilot tone can be identical.
Meanwhile the identical channel measurement interval that is distributed in of pilot tone is also that cannot be overlapped on the different antenna in neighboring community
, to inhibit the interference between pilot tone.
Fig. 7 is the composed structure schematic diagram of the transmitting device of the descending pilot frequency of the embodiment of the present invention, institute of the embodiment of the present invention
The transmitting device for the descending pilot frequency stated is applied to base station；As described in Figure 7, described device includes: that configuration module 71, resource determine mould
Block 72 and transmission module 73；Wherein,
The configuration module 71, for being generated according to system parameter and preset rules configuration sequence, and according to the sequence
The sequence and random number are sent to resource determination module 72 by random number；
The resource determination module 72, sequence and random number for being sent according to the configuration module 71 determine that downlink is led
The resource index value of frequency；
The transmission module 73, the resource index value for being determined according to the resource determination module 72 send downlink and lead
Frequently.
Preferably, the configuration module 71 generates antenna index value random number for determining according to antenna for base station total number
The length of sequence；The initial value of the random number sequence is determined according to preset rules；According to the initial value of the random number sequence
Cyclic shift generates multiple random numbers；Wherein, the preset rules include: the antenna index value range where the descending pilot frequency
Cover all antennas；
The resource determination module 72, the antenna index value for being determined as the random number where descending pilot frequency,
In, the ratio of number of antennas and antenna for base station total number where pilot tone is less than the first preset threshold.
Preferably, the configuration module 71 generates subcarrier index value random number for determining according to system maximum bandwidth
The length of sequence；More than one sequence is determined according to the preset rules；One above sequence is distributed into cell and small
Antenna where pilot tone in area, using the sequence as the initial value of random number sequence；According to the initial value of the random number sequence
Cyclic shift generates multiple random numbers；Wherein, the preset rules include: the index model of the subcarrier where the descending pilot frequency
Enclose the bandwidth range for covering the system；In identical channel measurement time, the sequence of every antenna configuration of neighboring community
The multiple random numbers generated are different；
The resource determination module 72, the subcarrier index value for being determined as the random number where descending pilot frequency,
Wherein, the subcarrier where pilot tone is discontinuous and is randomly distributed；Number of sub carrier wave where the pilot tone includes with bandwidth
Total number of sub-carriers purpose ratio less than the second preset threshold.
Preferably, the configuration module 71 is also used to for one above sequence being grouped, sequence component is assigned to
Each cell, the sequence group for distributing two neighboring cell are different；By one above sequence in the sequence group point
Antenna where pilot tone, the sequence that antenna where making the pilot tone obtains are all different in dispensing cell.
Preferably, the configuration module 71, is also used in different channel measurement times, when antenna passes through time division way
Identical sequence is distributed when transmitting pilot tone；Wherein, the channel measurement time interval include: at least one subframe, time slot or
OFDM symbol.
It will be appreciated by those skilled in the art that each processing module in the transmitting device of the descending pilot frequency of the embodiment of the present invention
Function can refer to the associated description of the transmission method of aforementioned descending pilot frequency and understand, the biography of the descending pilot frequency of the embodiment of the present invention
Each processing module in defeated device can be realized by realizing the analog circuit of function described in the embodiment of the present invention, can also be led to
It crosses operation of the software on intelligent terminal for executing function described in the embodiment of the present invention and realizes.
Wherein, the transmitting device of the descending pilot frequency is applied in base station, configuration module 71 and resource in described device
Determining module 72, in practical applications can by base station central processing unit (CPU, Central Processing Unit) or
Digital signal processor (DSP, Digital Signal Processor) or programmable gate array (FPGA, Field-
Programmable Gate Array) it realizes；Transmission module 73 in described device, in practical applications can be by base station
Transmission antenna is realized.
The embodiment of the present invention is directed to LTE downlink, devises in maximum bandwidth and is directed to multiple antennas, multiple cell, different channels
Measurement interval, the pilot frequency locations of the different empty frequency-domain sparse random distribution of different pilot tone patterns-, and ensure that identical
In channel measurement interval, the frequency domain position between different community and antenna where pilot tone is all different, to reach interference
The purpose of inhibition.
Meanwhile it can be seen that a kind of transmission method solution of descending pilot frequency provided by the present invention from above-mentioned all embodiments
The big problem of original pilot-frequency expense in large-scale multi-antenna system of having determined, and can be suitably used for for Massive antenna array biographies
The new channel information acquisition method of defeated proposition finally further improves the availability of frequency spectrum and handling capacity of system.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, the shape of hardware embodiment, software implementation or embodiment combining software and hardware aspects can be used in the present invention
Formula.Moreover, the present invention, which can be used, can use storage in the computer that one or more wherein includes computer usable program code
The form for the computer program product implemented on medium (including but not limited to magnetic disk storage and optical memory etc.).
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (11)
1. a kind of transmission method of descending pilot frequency, which is characterized in that the described method includes:
Random number is generated according to system parameter and preset rules configuration sequence, and according to the sequence；
The resource index value of descending pilot frequency is determined according to the sequence and the random number and sends descending pilot frequency；
Wherein, it according to system parameter and preset rules configuration sequence and generation random number, is determined according to the sequence and random number
The resource index value of descending pilot frequency, comprising:
The length for generating antenna index value random number sequence is determined according to antenna for base station total number；
The initial value of the random number sequence is determined according to preset rules；Wherein, the preset rules include: the descending pilot frequency
The antenna index value range at place covers all antennas；
Multiple random numbers are generated according to the initial value cyclic shift of the random number sequence；
The antenna index value random number being determined as where descending pilot frequency, wherein number of antennas and base station where pilot tone
The ratio of antenna total number is less than the first preset threshold.
2. the method according to claim 1, wherein the system parameter includes: antenna for base station total quantity, system
Maximum bandwidth.
3. the method according to claim 1, wherein the resource index value includes: antenna index value, frequency domain
Carrier index value, time-domain symbol index value.
4. method according to any one of claims 1 to 3, which is characterized in that configured according to system parameter and preset rules
Sequence and generation random number, the resource index value of descending pilot frequency is determined according to the sequence and random number, further includes:
The length for generating subcarrier index value random number sequence is determined according to system maximum bandwidth；
More than one sequence is determined according to the preset rules；Wherein, where the preset rules include: the descending pilot frequency
The index range of subcarrier covers the bandwidth range of the system；
One above sequence is distributed into antenna where pilot tone in cell and cell, using the sequence as random number sequence
Initial value；
Multiple random numbers are generated according to the initial value cyclic shift of the random number sequence；Wherein, in identical channel measurement
In, multiple random numbers that the sequence of every antenna configuration of neighboring community generates are different；
The subcarrier index value random number being determined as where descending pilot frequency, wherein the subcarrier where pilot tone is not connect
Continuous and irregular distribution；And the number of sub carrier wave where the pilot tone and bandwidth the total number of sub-carriers purpose ratio that includes are less than the
Two preset thresholds.
5. according to the method described in claim 4, it is characterized in that, described distribute to cell and small for one above sequence
Antenna where pilot tone in area, comprising:
One above sequence is grouped, sequence component is assigned to each cell, distributes two neighboring cell
Sequence group is different；
One above sequence in the sequence group is distributed into antenna where pilot tone in cell, makes day where the pilot tone
The sequence that line obtains is all different.
6. according to the method described in claim 5, it is characterized in that, the quantity of one above sequence is according to adjacent cell quantity
And the antenna amount of transmission pilot tone determines in each cell.
7. according to the method described in claim 4, it is characterized in that, the method also includes: in different channel measurement times
It is interior, it is the identical sequence of the antenna assignment when antenna transmits pilot tone by time division way；Wherein, between channel measurement time
Every including: at least one subframe, time slot or orthogonal frequency division multiplex OFDM symbol.
8. a kind of transmitting device of descending pilot frequency, which is characterized in that described device include: configuration module, resource determination module and
Transmission module；Wherein,
The configuration module, for generating random number according to system parameter and preset rules configuration sequence, and according to the sequence,
The sequence and random number are sent to resource determination module；
The resource determination module, sequence and random number for being sent according to the configuration module determine the resource of descending pilot frequency
Index value；
The transmission module, the resource index value for being determined according to the resource determination module send descending pilot frequency；
Wherein, the configuration module is also used to determine generation antenna index value random number sequence according to antenna for base station total number
Length；The initial value of the random number sequence is determined according to preset rules；It is recycled and is moved according to the initial value of the random number sequence
Position generates multiple random numbers；Wherein, the preset rules include: the antenna index value range covering institute where the descending pilot frequency
There is antenna；
The resource determination module is also used to for the random number to be determined as the antenna index value where descending pilot frequency, wherein lead
The ratio of number of antennas and antenna for base station total number where frequency is less than the first preset threshold.
9. device according to claim 8, which is characterized in that the configuration module is also used to according to system maximum bandwidth
Determine the length for generating subcarrier index value random number sequence；More than one sequence is determined according to the preset rules；It will be described
More than one sequence distributes to antenna where pilot tone in cell and cell, using the sequence as the initial value of random number sequence；
Multiple random numbers are generated according to the initial value cyclic shift of the random number sequence；Wherein, under the preset rules include: described
The index range of subcarrier where row pilot tone covers the bandwidth range of the system；In identical channel measurement time, phase
Multiple random numbers that the sequence of every antenna configuration of adjacent cell generates are different；
The resource determination module, the subcarrier index value for being determined as the random number where descending pilot frequency, wherein lead
Subcarrier where frequency is for discontinuous and irregular distribution；The son that number of sub carrier wave and bandwidth where the pilot tone include
Total number subcarriers purpose ratio is less than the second preset threshold.
10. device according to claim 9, which is characterized in that the configuration module is also used to one above sequence
Column are grouped, and sequence component is assigned to each cell, and the sequence group for distributing two neighboring cell is different；By the sequence
One above sequence in group distributes to antenna where pilot tone in cell, and the sequence that antenna where making the pilot tone obtains is all
It is different.
11. device according to claim 9, which is characterized in that the configuration module is also used in different channel measurements
In time, identical sequence is distributed when antenna transmits pilot tone by time division way；Wherein, channel measurement time interval includes:
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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| CN201310676444.2A CN104717659B (en) | 2013-12-11 | 2013-12-11 | A kind of transmission method and device of descending pilot frequency |
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| CN106998247A (en) * | 2016-01-22 | 2017-08-01 | 中兴通讯股份有限公司 | The method and the network equipment of a kind of transmission of reference signals |
| CN107453853B (en) * | 2016-05-31 | 2020-10-16 | 华为技术有限公司 | Method and device for pilot frequency transmission |
| CN114696971A (en) * | 2020-12-25 | 2022-07-01 | 维沃移动通信有限公司 | Pilot frequency transmission method, device, equipment and storage medium |
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| CN1829373A (en) * | 2005-03-01 | 2006-09-06 | 阿尔卡特公司 | A method for OFDM data transmission, a base transceiver station, a base station controller, a mobile terminal and a mobile network therefor |
| CN101540631A (en) * | 2009-04-27 | 2009-09-23 | 中兴通讯股份有限公司 | Multi-antenna sending method and device for measuring reference signal |
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| CN100571239C (en) * | 2006-01-16 | 2009-12-16 | 华为技术有限公司 | Synchronizing pilot sequence generation system and method in the communication system |
| US8218663B2 (en) * | 2008-07-29 | 2012-07-10 | Texas Instruments Incorporated | Reference signal resource allocation for single user MIMO |
| US8194762B2 (en) * | 2008-08-19 | 2012-06-05 | Motorola Mobility, Inc. | Feedforward of non-quantized precoding weights in a wireless communications system |
| CN101883383A (en) * | 2009-05-08 | 2010-11-10 | 中兴通讯股份有限公司 | Method for sending downlink measuring pilot frequencies |
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| CN1829373A (en) * | 2005-03-01 | 2006-09-06 | 阿尔卡特公司 | A method for OFDM data transmission, a base transceiver station, a base station controller, a mobile terminal and a mobile network therefor |
| CN101605117A (en) * | 2008-06-13 | 2009-12-16 | 中兴通讯股份有限公司 | Pilot distribution method and system |
| CN101540631A (en) * | 2009-04-27 | 2009-09-23 | 中兴通讯股份有限公司 | Multi-antenna sending method and device for measuring reference signal |
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| WO2014187294A1 (en) | 2014-11-27 |
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