CN104301073A - Reference signal setting method in mobile communication system - Google Patents
Reference signal setting method in mobile communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0675—Space-time coding characterised by the signaling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0631—Receiver arrangements
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Abstract
A reference signal setting method in a mobile communication system is provided. The present invention presents a solution for space division multiplexing demodulation reference signals in a massive MIMO network. In one embodiment, a RE for demodulating reference signals of an LTE system is divided into two parts, one for transmitting demodulation reference signals which are not space-division-multiplexed, and the other one for transmitting demodulation reference signals in a space division multiplexing manner. The technical solution provided in the present invention solves the problem that the cost for demodulating reference signals in the massive MIMO is too high, and meanwhile maintains the compatibility with existing systems as best as possible.
Description
Technical Field
The present invention relates to a scheme for Reference Signal design in the field of mobile communication technology, and in particular, to a scheme for a downlink Demodulation Reference Signal (DMRS-Demodulation Reference Signal) in a mobile communication system using a Massive MIMO-Massive Multiple Input Multiple Output (MIMO) technology.
Background
In a conventional 3GPP 3rd Generation partnership project (3 GPP 3rd Generation partnership project) Long Term Evolution (LTE-Long Term Evolution) system, three downlink reference signals are defined:
● Cell-specific Reference Signal (CRS-Cell specific Reference Signal)
●DMRS
● channel state indication Reference Signal (CSI-RS: CSI Reference Signal)
The CRS and the DMRS are used for data demodulation, and the CSI-RS is used for channel information monitoring. Fig. 1 is a CSI-RS pattern based on Normal cyclic prefix (Normal CP-Normal cyclic prefix) in an existing LTE cell-both CRS and Demodulation Reference Signal (DMRS-Demodulation Reference Signal) are labeled, wherein one cell is a minimum Resource unit-Resource Element (RE-Resource Element) of LTE. The LTE system defines RS resources using the concept of ports: one RS port may be mapped to one physical antenna, or multiple physical antennas may be combined and superimposed to form one virtual antenna. The numbers marked in the attached figure 1 are antenna port numbers, namely antenna ports 0-3 are CRS, ports 7-10 are DMRS, and ports 15-22 are CSI-RS. Wherein, the DMRS and the CSI-RS use an Orthogonal cover Code (OCC-Orthogonal Covering Code) with a length of 2, for example, the ports 7 and 8.
Massive MIMO has recently become a research hotspot as a new cellular network antenna architecture. A typical characteristic of the Massive MIMO system is that a series of gains are obtained by increasing the number of antenna array elements to a larger value, for example, the system capacity theoretically continuously increases as the number of antennas increases; coherent superposition of transmit antenna signals reduces transmit power, and so on. A typical application scenario of masivemimo is to improve spectral efficiency by increasing the number of spatial multiplexing multiple users. One challenge faced by Massive MIMO is that the overhead of the downlink DMRS may be too large. Taking a Long Term Evolution (LTE-Long Term Evolution) system as an example, at most 4 User equipments (UE-User equipments) are supported for multi-User transmission, and 24 Resource elements (RE-Resource elements) are allocated as DMRSs, which account for 14.3% of all available REs. Assuming that MassiveMIMO simultaneously supports 20 UE multi-user transmissions using the same DMRS overhead, DMRS accounts for 71.4% of all available resources, and considering the overhead of control signaling, a small proportion of REs are left for data transmission, which greatly reduces transmission efficiency. The invention discloses a reference signal setting method aiming at the problem.
Disclosure of Invention
The invention discloses a method in system equipment, which comprises the following steps:
A. mapping K sets of reference signalsTo K groups of physical resourcesTherein are disclosedMapping to
B. Mapping K sets of reference signals in a space division multiplexed mannerTo physical resource R2Therein are disclosedMapping to R2
C. Mapping group data D in space division multiplexing mode1,…,DKTo physical resource R3In which D iskMapping to R3
D. Transmitting data on a downlink resource block, the downlink resource block comprising at least physical resourcesR2，R3
Wherein,after the same pre-coding process, the signals before pre-coding are respectivelyK is an integer greater than 1, and K is an integer taken from 1 to K.
The reference signalAnd the reference signalComposition demodulation of the data DkRequired DMRS. The 4 steps have no strict chronological relationship, as an embodiment, the execution sequence of the steps is B, A, C and D, as another embodiment, the steps are executed in parallelThe line, i.e. the transmission (step D) while mapping (steps a, B, C). The above-mentionedIs 1 XN1Vector of theIs 1 XN2Vector of theDimensions are M × N respectively1，M×N2Wherein each row vector corresponds to a transmit antenna, and the precoding is a common transmit scheme for multi-antenna systems, i.e. Where M is the number of transmit antennas, N1,N2Are respectivelyThe length (number of REs) of (c),is a precoding vector.
Specifically, according to one aspect of the present invention, the downlink resource block is 1 Physical Resource Block (PRB) pair defined by a long term evolution (LTE-a) system.
For LTE, LTE-a downlink transmission, the smallest scheduling granule is a PRB pair, i.e., a time-frequency resource block with a frequency domain bandwidth of 180 kilohertz (kHz-killo Hertz) and a duration of 1 millisecond (ms-millisecond). The scheduling of multiple users may be different on different PRB pairs in the frequency domain, so for LTE, LTE-a system, the downlink resource block is one PRB pair.
In particular, according to one aspect of the invention, it is characterized in that saidOne Resource Element (RE) is occupied in each Physical Resource Block (PRB) pair.
The above-mentionedIn the above-mentionedAnd the uplink transmission is not subjected to space division multiplexing with other reference signals, and channel estimation information free from multi-user interference is provided. However, in order to reduce resource overhead, theThe resources occupied within 1 PRB are 1 RE. If it is saidOCC, i.e. code division multiplexing, is used, the occupied resources areThe number of occupied REs in one PRB is divided by the number of OCCs multiplexed on said occupied REs.
In particular, according to one aspect of the invention, it is characterized in that inside one PRB pair, saidAnd said R2Are all part of the REs used for demodulation reference signal (DMRS) transmission in a long term evolution (LTE-a) system.
In the LTE-a system, DMRS occupies a maximum of 24 REs within one PRB pair. Also in order to maintain compatibility with existing systems, the describedAnd said R2Within one PRB pair is distributed over the 24 REs.
In particular, according to one aspect of the invention, it is characterized in that inside one PRB pair, saidAnd said R2The occupied REs add up to all of the REs used for demodulation reference signal (DMRS) transmission in a long term evolution (LTE-a) system.
In the LTE-A system, RE occupied by DMRS is divided into two parts, one part is used forAnother part for R2。
In particular, according to one aspect of the invention, it is characterized in that inside one PRB pair, saidOccupied RE is greater than R2Occupied REs are located at more frequency domain edges.
The above-mentionedThe method has no multi-user interference, and the method should be placed at a position closer to the center of the PRB pair, so that the average channel information of the PRB pair can be embodied better. Accordingly, the method can be used for solving the problems that,comparing in channel estimationOccupying a higher weight.
In particular, according to one aspect of the invention, it is characterized in that saidCompared with thePower Boosting is used.
In order to reduce resource overhead, theOccupy less resources and ensure the accuracy of channel estimationUsing power boosting, i.e. as describedIs compared with the transmission power ofP decibels (dB) higher, the P being configured or predefined by the system.
The invention discloses a method in User Equipment (UE), which comprises the following steps:
A. receiving data on a downlink resource block, the downlink resource block comprising at least physical resourcesR2，R3
B. From local reference signalsRespectively to physical resourcesPerforming a channel estimation operation on the signal to obtain first channel information
C. From local reference signalsFor physical resource R2Performing a channel estimation operation on the signal to obtain a second signalChannel information
D. From physical resources R3Up-demodulating out data Dk_1,Dk_2,…,Dk_T
Wherein the physical resourceNo other signals of space division multiplex, the physical resource R2Other K-T sets of reference signals are space-multiplexed. K is an integer greater than 1; t is an assigned rank number and is an integer of 1 or more and K or less; k _1, K _2, …, K _ T are assigned reference signal indices, and are integers of 1 or more and K or less.
The channel estimation algorithm used in the channel estimation operation in the above steps B and C is a realization-related problem, and typical channel estimation algorithms include Least Square (LS-Least Square) channel estimation, Minimum Mean Square Error (MMSE-Minimum Mean Square Error) channel estimation, and the like.
Specifically, according to one aspect of the present invention, the first channel information is used for at least one of:
-acquisition of said second channel information
Said data Dk_1,Dk_2,…,Dk_TDemodulation of
As an example:
the first channel information is obtained using an LS channel estimation algorithm,whereinIs a physical resourceA received signal of/represents a dot division operation of the vector. The k _ t traverses k_1,k_2,…,k_T。
The second channel information is obtained by adopting an MMSE channel estimation algorithm, and not only background noise but also multi-user interference are considered. Channel information containing multi-user interference is obtained through an LS algorithm: <math>
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</math> Wherein E (Q) represents averaging of elements in vector Q, (Q)HIndicating that the vector Q is transposed by the conjugate. Further, second channel information is obtained by MMSE: <math>
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</math> wherein Is a physical resource R2The received signal of (1) is 1 XN2Vector, (Q)' identifies the transpose of Q,is a channel estimation filter composed ofThe statistical time-frequency correlation characteristic decision among the occupied REs is N2×N2Matrix, said k _ T traversing k _1, k _2, …, k _ T.
As a further example:
the data Dk_1,Dk_2,…,Dk_TIs realized by MMSE equalization, d is hH·z/(|h|2+2+N0) Where h is the estimated second channel information,2is multi-user interference, N0Is background noise, z is the physical resource R3Data received on one RE of (a).
The invention discloses a system side device, which is characterized by comprising:
a first module: mapping K sets of reference signalsTo K groups of physical resourcesTherein are disclosedMapping to
A second module: mapping K sets of reference signals in a space division multiplexed mannerTo physical resource R2Therein are disclosedMapping to R2
A third module: mapping group data D in space division multiplexing mode1,…,DKTo physical resource R3In which D iskMapping to R3
A fourth module: transmitting data on a downlink resource block, the downlink resource block comprising at least physical resourcesR2，R3
Wherein,after the same pre-coding process, the signals before pre-coding are respectivelyK is an integer greater than 1, and K is an integer taken from 1 to K.
The invention discloses a User Equipment (UE), which is characterized by comprising the following components:
a first module: receiving data on a downlink resource block, the downlink resource block comprising at least physical resourcesR2，R3
A second module: from local reference signalsRespectively to physical resourcesPerforming a channel estimation operation on the signal to obtain first channel information
A third module: from local reference signalsFor physical resource R2Performing a channel estimation operation on the signal to obtain second channel information
A fourth module: from physical resources R3Up-demodulating out data Dk_1,Dk_2,…,Dk_T
Wherein the physical resourceNo other signals of space division multiplex, the physical resource R2Other K-T sets of reference signals are space-multiplexed. K is an integer greater than 1; t is an assigned rank number and is an integer of 1 or more and K or less; k _1, K _2, …, K _ T are assigned reference signal indices, and are integers of 1 or more and K or less.
The invention solves the problem of overhigh DMRS expense in a Massive MIMO system, saves the resource expense by space division multiplexing on partial resources of one DMRS port and simultaneously ensures higher channel estimation performance. In addition, the invention maintains the compatibility with the existing system to the maximum extent.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 shows one example of a downlink RS pattern of an existing LTE cell;
fig. 2 illustrates a diagram of downlink reference signals mapped to REs used for DMRSs in an LTE system according to an embodiment of the present invention;
fig. 3 illustrates a diagram of partial downlink reference signals mapped to REs of non-DMRS of an LTE system according to an embodiment of the present invention;
fig. 4 shows a block diagram of a processing device for use in a base station according to an embodiment of the invention;
fig. 5 shows a block diagram of a processing device used in a UE according to an embodiment of the invention;
Detailed Description
The technical solutions of the present invention will be further described in detail with reference to the accompanying drawings, and it should be noted that the features of the embodiments and examples of the present application may be arbitrarily combined with each other without conflict.
Example 1
Embodiment 1 is a schematic diagram of mapping downlink reference signals to REs used for DMRSs in an LTE system, as shown in fig. 2.
Base station equipment mapping 16 groups of reference signalsTo 16 groups of physical resourcesTherein are disclosedMapping to1≤k≤16，One RE is occupied and a total of 16 REs are shown in the first area of fig. 2. Base station equipment maps 16 groups of reference signals in a space division multiplexing modeTo physical resource R2Therein are disclosedMapping to R2And k is more than or equal to 1 and less than or equal to 16. The R is2As shown in the second area of fig. 2. Base station apparatus mapping group data D in space division multiplexing manner1,…,D16To physical resource R3In which D iskMapping to R3And k is more than or equal to 1 and less than or equal to 16. The R is3As indicated by the blank RE in figure 2. The base station apparatus transmits on a downlink PRB pair,D1,…,D16. Wherein,Dkthe same precoding process is performed.
In fig. 2, the first and second regions cover exactly 24 REs for DMRS of the conventional LTE system. Furthermore, the REs of the first region are located at positions relatively closer to the center of the frequency domain than the REs of the second region, and the channel information obtained based on the REs of the first region is closer to the average value of the channel information of the whole PRB pair, and therefore, the RE of the first region is more suitable for occupying a larger weight during channel equalization.
Example 2
Embodiment 2 is a schematic diagram of mapping part of downlink reference signals to REs of non-DMRS in an LTE system, as shown in fig. 3. Embodiment 2 differs from embodiment 1 in the arrangement of the first region. In embodiment 2, the 16 REs of the first region include 8 REs for DMRS and 8 non-DMRS REs, and the second region is the same as in embodiment 1. Compared to embodiment 1, the first region in embodiment 2 is located closer to the center of the frequency domain, and therefore can be closer to the average value of the channel information of the entire PRB pair.
Example 3
Embodiment 3 is a block diagram of a processing apparatus used in a base station (eNB), as shown in fig. 4. In fig. 4, the eNB apparatus 300 includes a mapping apparatus 301, a mapping apparatus 302, a mapping apparatus 303, and a transmitting apparatus 304. Wherein the mapping means 301 maps the K sets of reference signalsTo K groups of physical resourcesTherein are disclosedMapping to(ii) a Mapping means 302 maps K sets of reference signals in space division multiplexTo physical resource R2Therein are disclosedMapping to R2(ii) a The mapping means 303 maps the group data D in a space division multiplexing manner1,…,DKTo physical resource R3In which D iskMapping to R3(ii) a Transmitting means 304 transmits data on downlink resource blocks comprising at least physical resourcesR2，R3. Wherein,after the same pre-coding process, the signals before pre-coding are respectivelyK is an integer greater than 1, and K is an integer taken from 1 to K.
Example 4
Embodiment 4 is a block diagram of a processing apparatus used in a UE, as shown in fig. 5. In fig. 5, UE apparatus 400 includes receiving apparatus 401, processing apparatus 402, processing apparatus 403, and processing apparatus 404. Wherein the receiving means 401 receives data on downlink resource blocks comprising at least physical resourcesR2，R3(ii) a The processing device 402 is based on the local reference signalRespectively to physical resourcesPerforming a channel estimation operation on the signal to obtain first channel information; the processing device 403 is based on the local reference signalAnd first channel information for physical resource R2The signal on the first channel is subjected to channel estimation operation to obtain second channel information; the processing means 403 slave physical resources R according to the first channel information and the second channel information3Up-demodulating out data Dk_1,Dk_2,…,Dk_T. Wherein the physical resourceNo other signals of space division multiplex, the physical resource R2Other K-T sets of reference signals are space-multiplexed. K is an integer greater than 1; t is an assigned rank number and is an integer of 1 or more and K or less; k _1, K _2, …, K _ T are assigned reference signal indices, and are integers of 1 or more and K or less.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a hard disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented by using one or more integrated circuits. Accordingly, the module units in the above embodiments may be implemented in a hardware form, or may be implemented in a form of software functional modules, and the present application is not limited to any specific form of combination of software and hardware.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (11)
1. A method in a system device, comprising the steps of:
A. mapping K sets of reference signalsTo K groups of physical resourcesTherein are disclosedMapping to
B. Mapping K sets of reference signals in a space division multiplexed mannerTo physical resource R2Therein are disclosedMapping to R2
C. Mapping group data D in space division multiplexing mode1,…,DKTo physical resource R3In which D iskMapping to R3
D. Transmitting data on a downlink resource block, the downlink resource block comprising at least physical resourcesR2，R3
Wherein,after the same pre-coding process, the signals before pre-coding are respectivelyK is an integer greater than 1, and K is an integer taken from 1 to K.
2. The method of claim 1, wherein the downlink resource blocks are 1 Physical Resource Block (PRB) pair defined by a long term evolution (LTE-a) system.
3. The method of claim 1, wherein the step of applying the coating comprises applying a coating to the substrateAn average of one Resource Element (RE) is occupied in each Physical Resource Block (PRB) pair.
4. The method of claim 1, wherein the PRB pair is within one PRB pairAnd said R2Are all part of the REs used for demodulation reference signal (DMRS) transmission in a long term evolution (LTE-a) system.
5. The method of claim 1, wherein the PRB pair is within one PRB pairAnd said R2The occupied REs add up to all of the REs used for demodulation reference signal (DMRS) transmission in a long term evolution (LTE-a) system.
6. The method of claim 1, wherein the PRB pair is within one PRB pairOccupied RE is greater than R2Occupied REs are located at more frequency domain edges.
7. The method of claim 1, wherein the step of applying the coating comprises applying a coating to the substrateCompared with thePower Boosting is used.
8. A method in a User Equipment (UE), comprising the steps of:
A. receiving data on a downlink resource block, the downlink resource block comprising at least physical resourcesR2，R3
B. From local reference signalsRespectively to physical resourcesPerforming a channel estimation operation on the signal to obtain first channel information
C. From local reference signalsFor physical resource R2Performing a channel estimation operation on the signal to obtain second channel information
D. From physical resources R3Up-demodulating out data Dk_1,Dk_2,…,Dk_T
Wherein the physical resourceNo other signals of space division multiplex, the physical resource R2Other K-T sets of reference signals are space-multiplexed. K is an integer greater than 1; t is an assigned rank number and is an integer of 1 or more and K or less; k _1, K _2, …, K _ T are assigned reference signal indices, and are integers of 1 or more and K or less.
9. The method of claim 8, wherein the first channel information is used for at least one of:
-acquisition of said second channel information
-saidData Dk_1,Dk_2,…,Dk_TAnd (4) demodulating.
10. A system-side device, comprising:
a first module: mapping K sets of reference signalsTo K groups of physical resourcesTherein are disclosedMapping to
A second module: mapping K sets of reference signals in a space division multiplexed mannerTo physical resource R2Therein are disclosedMapping to R2
A third module: mapping group data D in space division multiplexing mode1,…,DKTo physical resource R3In which D iskMapping to R3
A fourth module: transmitting data on a downlink resource block, the downlink resource block comprising at least physical resourcesR2，R3
Wherein,after having been subjected to the same pre-coding process,the signals before precoding are respectivelyK is an integer greater than 1, and K is an integer taken from 1 to K.
11. A User Equipment (UE), characterized in that the apparatus comprises:
a first module: receiving data on a downlink resource block, the downlink resource block comprising at least physical resourcesR2，R3
A second module: from local reference signalsRespectively to physical resourcesPerforming a channel estimation operation on the signal to obtain first channel information
A third module: from local reference signalsFor physical resource R2Performing a channel estimation operation on the signal to obtain second channel information
A fourth module: from physical resources R3Up-demodulating out data Dk_1,Dk_2,…,Dk_T
Wherein the physical resourceNo other signals of space division multiplex, the physical resource R2Other K-T sets of reference signals are space-multiplexed. K is an integer greater than 1; t is an assigned rank number and is an integer of 1 or more and K or less; k _1, k _2, …, k _ T are assigned reference signal indexes, all are greater than or equal to 1 and less than or equal toAn integer at K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310300905.6A CN104301073B (en) | 2013-07-17 | 2013-07-17 | A kind of reference signal setting method in mobile communication system |
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| CN107949999A (en) * | 2015-07-14 | 2018-04-20 | 瑞典爱立信有限公司 | Reference signal in communication network |
| CN109150447A (en) * | 2017-06-16 | 2019-01-04 | 中兴通讯股份有限公司 | Information transmission, data demodulation method and device, communication node, network side equipment |
| CN109863716A (en) * | 2016-11-04 | 2019-06-07 | 高通股份有限公司 | For configuring the technology of the reference signal mode in wireless communication |
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