CN103546260B - Multi-radio remote unit cell-shared coordinating multipoint transmission method and device - Google Patents

Multi-radio remote unit cell-shared coordinating multipoint transmission method and device Download PDF

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CN103546260B
CN103546260B CN201210237441.4A CN201210237441A CN103546260B CN 103546260 B CN103546260 B CN 103546260B CN 201210237441 A CN201210237441 A CN 201210237441A CN 103546260 B CN103546260 B CN 103546260B
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rru
comp
target
rrus
data
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CN103546260A (en
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董伟
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a multi-radio remote unit cell-shared coordinating multipoint transmission method and device, and relates to the technical field of communication network technology; uplink demodulation performance can be improved, and user dropped calls can be reduced. According to an embodiment, the method includes a target RRU of a user device according to at least two radio remote units of a same base station; determining a coordinating RRU of the user device according to the target RRU and other RRU except for the target RRU; performing coordinating multipoint transmission CoMP equalization processing on received user data by the target RRU and the coordinating RRU, and acquiring demodulation data of the user device. The scheme provided by the embodiment is adaptable to multi-radio remote unit cell-shared uplink coordinating multipoint transmission.

Description

Method and device for multi-radio remote unit cell-sharing coordinated multi-point transmission
Technical Field
The present invention relates to the field of communications network technologies, and in particular, to a method and an apparatus for multi-radio remote unit co-cell coordinated multi-point transmission.
Background
At present, a cell shared by multiple Radio Remote Units (RRUs) is a cell combining multiple RRUs coverage cells into a same cell, so that a switching area between multiple cells originally becomes a same-cell connection point, switching is reduced, a single-station coverage distance is extended, probability of cell reselection and cell switching of User Equipment (UE) in a network is reduced, a call success rate of a terminal User is improved, a call drop probability is reduced, and User experience and network quality are effectively improved.
In the prior art, when a multi-RRU cell sharing mode is adopted to receive information sent by a UE in an uplink manner, all RRUs receiving the information of the UE measure an uplink Signal-to-Interference plus Noise Ratio (SINR) of the UE, select an RRU with the largest SINR to serve the UE, receive the information sent by the UE, and demodulate the information.
However, when the prior art is adopted to receive and demodulate UE information, the edge overlapping area covered by a plurality of RRUs is far away from the base station, and signals are poor, so that uplink demodulation performance is poor and user drop rate is high.
Disclosure of Invention
The embodiment of the invention provides a method and a device for multi-radio remote unit cell-sharing coordinated multi-point transmission, which can improve uplink demodulation performance and reduce user disconnection rate.
In one aspect, an embodiment of the present invention provides a method for multi-radio remote unit co-cell coordinated multi-point transmission, including:
determining a target RRU of user equipment according to at least two RRUs of the same base station;
determining a cooperative RRU of the user equipment according to the target RRU and RRUs except the target RRU;
and performing coordinated multi-point transmission (CoMP) equalization processing on the received user data by the target RRU and the coordinated RRU to obtain demodulation data of the user equipment.
In another embodiment of the present invention, the determining the target RRU of the user equipment according to at least two RRUs of the same base station includes: acquiring uplink signal to interference plus noise ratio (SINR) measured by at least two RRUs of the same base station; and determining the RRU corresponding to the maximum uplink SINR in the uplink SINRs as a target RRU of the user equipment.
In another embodiment of the present invention, the determining, according to the target RRU and RRUs other than the target RRU, the cooperative RRU of the user equipment includes: determining a cooperative RRU of the user equipment according to the uplink Reference Signal Received Power (RSRP) measured by the target RRU and the uplink RSRP measured by RRUs except the target RRU; or determining the cooperative RRU of the user equipment according to the uplink SINR measured by the target RRU and the uplink SINR measured by RRUs except the target RRU.
In another aspect, an embodiment of the present invention provides an apparatus for multi-radio remote unit co-cell coordinated multipoint transmission, including:
the processor is used for determining a target RRU of the user equipment according to the at least two RRUs; determining a cooperative RRU of the user equipment according to the target RRU and RRUs except the target RRU;
the target RRU is used for carrying out coordinated multi-point transmission CoMP equalization processing on the received user data jointly with the coordinated RRU.
In another embodiment of the invention, the processor is configured to: acquiring uplink signal to interference plus noise ratio (SINR) measured by at least two RRUs; and determining the RRU corresponding to the maximum uplink SINR in the uplink SINRs as a target RRU of the user equipment.
In another embodiment of the present invention, the processor includes: a first determining module, configured to determine a cooperative RRU of the user equipment according to an uplink RSRP measured by the target RRU and uplink RSRPs measured by RRUs other than the target RRU; or, the second determining module is configured to determine the RRU for the user equipment according to the uplink SINR measured by the target RRU and uplink SINRs measured by RRUs other than the target RRU.
The embodiment of the invention provides a method and a device for multi-radio remote unit common-cell coordinated multi-point transmission, which determine a target RRU of user equipment according to at least two RRUs of the same base station; determining a cooperative RRU of the user equipment according to the target RRU and RRUs except the target RRU; and performing coordinated multi-point transmission (CoMP) equalization processing on the received user data by the target RRU and the coordinated RRU to obtain demodulation data of the user equipment. Compared with the prior art that when UE information is received and demodulated, the uplink demodulation performance is poor and the user drop rate is high due to poor signals in the edge overlapping areas covered by the plurality of RRUs, in the embodiment, the uplink demodulation performance can be improved and the user drop rate can be reduced by joint processing of the target RRU and the cooperative RRUs.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a method for multi-radio remote unit co-cell coordinated multi-point transmission according to embodiment 1 of the present invention;
fig. 2 is a block diagram of an apparatus for multi-radio remote unit co-cell coordinated multi-point transmission according to embodiment 1 of the present invention;
fig. 3 is a flowchart of a method for determining a cooperative RRU according to embodiment 2 of the present invention;
fig. 4 is a flowchart of another method for determining a cooperative RRU according to embodiment 2 of the present invention;
fig. 5 is a schematic diagram illustrating CoMP equalization processing performed by a target RRU and a cooperative RRU on received user data according to embodiment 2 of the present invention;
fig. 6 is another schematic diagram illustrating that a target RRU and a cooperating RRU perform CoMP equalization processing on received user data according to embodiment 2 of the present invention;
fig. 7 is another schematic diagram illustrating that a target RRU and a cooperating RRU perform CoMP equalization processing on received user data according to embodiment 2 of the present invention;
fig. 8 is a block diagram of an apparatus for multi-radio remote unit co-cell coordinated multi-point transmission according to embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An embodiment of the present invention provides a method for multi-radio remote unit co-cell coordinated multi-point transmission, where an execution subject of the method is a base station, and as shown in fig. 1, the method includes the following steps:
step 101, determining a target RRU of user equipment according to at least two RRUs of a same base station;
it should be noted that at least two RRUs are configured to be the same logical cell, that is, at least two RRUs belong to the same base station, where at least a target RRU and a cooperating RRU are included.
Optionally, obtaining uplink signal to interference plus noise ratio SINR measured by at least two radio remote units RRUs of the same base station; and determining the RRU corresponding to the maximum uplink SINR in the uplink SINRs as a target RRU of the user equipment.
Step 102, determining a cooperative RRU of the user equipment according to the target RRU and RRUs other than the target RRU;
optionally, determining a cooperative RRU of the user equipment according to the uplink RSRP measured by the target RRU and uplink RSRP measured by RRUs other than the target RRU;
specifically, the absolute value of the difference between the uplink RSRP measured by the target RRU and the uplink RSRP measured by each RRU except the target RRU is calculated; and determining the cooperative RRU of the user equipment according to the absolute value of the difference value.
Determining the cooperative RRU of the user equipment according to the absolute value of the difference comprises the following modes:
when the absolute values of at least two of the difference values are less than or equal to a preset CoMP (Coordinated Multi-Point transmission) threshold and the RRUs corresponding to the absolute values of the at least two difference values are RRUs with the same number of antennas, determining the RRU corresponding to the absolute value of the smallest difference value among the absolute values of the at least two difference values as a cooperative RRU of the user equipment;
when the absolute values of at least two of the difference values are smaller than or equal to a preset CoMP threshold and the RRUs corresponding to the absolute values of the at least two difference values are RRUs with different antenna numbers, determining the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRUs corresponding to the absolute values of the at least two difference values;
when only one absolute value of the difference is smaller than or equal to a preset CoMP threshold, determining that the RRU corresponding to the absolute value of the difference is a cooperative RRU of the user equipment;
and when the absolute values of all the difference values are larger than the preset CoMP threshold, the user equipment is a non-CoMP user, and the processing flow is quitted.
Optionally, the cooperative RRU of the user equipment is determined according to the uplink SINR of the target RRU and uplink SINRs measured by RRUs other than the target RRU.
Specifically, the difference between the uplink SINR measured by the target RRU and the uplink SINR measured by the RRUs other than the target RRU is calculated respectively; and when the difference is smaller than or equal to a preset uplink SINR difference threshold, determining the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRU corresponding to the difference.
Step 103, performing coordinated multi-point transmission CoMP equalization processing on the received user data by the target RRU and the coordinated RRU to obtain demodulation data of the user equipment.
Optionally, when the target RRU and the cooperative RRU are RRUs with the same number of antennas, the cooperative RRU in the base station performs Discrete Fourier Transform (DFT) processing on the received user data, and sends the obtained first CoMP data to the target RRU in the base station;
and the target RRU performs DFT processing on the received user data to obtain second CoMP data, and performs interference suppression and combination processing on the first CoMP data and the second CoMP data.
Optionally, when the target RRU and the cooperative RRU are RRUs with different numbers of antennas, the cooperative RRU in the base station performs DFT processing on user data received by a preset number of antennas, and sends the obtained third CoMP data to the target RRU in the base station; the target RRU carries out DFT processing on the received user data to obtain second CoMP data, and carries out interference suppression and combination processing on the third CoMP data and the second CoMP data; or,
the target RRU in the base station performs DFT processing on the received user data, and sends the obtained second CoMP data to the cooperative RRU in the base station; the cooperative RRU performs DFT processing on user data received by a preset number of antennas to obtain third CoMP data, and performs interference suppression and combination processing on the third CoMP data and the second CoMP data; or,
when the target RRU and the cooperative RRU are RRUs with different antenna numbers, the cooperative RRU in the base station sequentially performs DFT processing, interference suppression combining processing and Inverse Discrete Fourier Transform (IDFT) on the received user data to obtain fifth CoMP data, and sends the fifth CoMP data to the target RRU; meanwhile, the target RRU in the base station sequentially performs DFT processing, interference suppression combining processing and IDFT on the received user data to obtain sixth CoMP data; and the target RRU performs maximum ratio combining processing on the fifth CoMP data and the sixth CoMP data.
The embodiment of the invention provides a method for multi-radio remote unit common-cell coordinated multi-point transmission, which can improve uplink demodulation performance and reduce user disconnection rate by respectively determining a target RRU and a coordinated RRU and then jointly performing coordinated multi-point transmission CoMP equalization processing on received user data by the target RRU and the coordinated RRU.
An embodiment of the present invention provides an apparatus for multi-radio remote unit co-cell coordinated multi-point transmission, where the apparatus may be a base station, and as shown in fig. 2, the apparatus includes: a processor 201, a target RRU202, a cooperating RRU 203;
a processor 201, configured to determine a target RRU of a user equipment according to at least two remote radio units RRUs; determining a cooperative RRU of the user equipment according to the target RRU and RRUs except the target RRU;
it should be noted that at least two RRUs are configured to be the same logical cell, that is, at least two RRUs belong to the same base station, and at least include a target RRU and a cooperating RRU.
Optionally, the processor 201 is configured to: acquiring uplink signal to interference plus noise ratio (SINR) measured by at least two RRUs; and determining the RRU corresponding to the maximum uplink SINR in the uplink SINRs as a target RRU of the user equipment.
Optionally, the first determining module in the processor 201 is configured to determine the RRU in cooperation with the user equipment according to the uplink RSRP measured by the target RRU and the uplink RSRP measured by RRUs other than the target RRU; or, a second determining module in the processor 201 is configured to determine the RRU for the user equipment according to the uplink SINR measured by the target RRU and the uplink SINR measured by RRUs other than the target RRU.
Further, the calculating sub-module in the first determining module is configured to calculate an absolute value of a difference between the uplink RSRP measured by the target RRU and the uplink RSRP measured by each RRU except the target RRU; and the determining module in the first determining module is configured to determine the RRU of the user equipment according to the absolute value of the difference.
Further, the determining sub-module is configured to:
when the absolute values of at least two of the difference values are smaller than or equal to a preset CoMP threshold and the RRUs corresponding to the absolute values of the at least two difference values are the RRUs with the same number of antennas, determining the RRU corresponding to the absolute value of the minimum difference value in the absolute values of the at least two difference values as a cooperative RRU of the user equipment;
when the absolute values of at least two difference values are smaller than or equal to a preset CoMP threshold and the RRUs corresponding to the at least two difference values are RRUs with different antenna numbers, determining the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRUs corresponding to the at least two difference values;
when only one absolute value of the difference value is smaller than or equal to a preset CoMP threshold, determining that the RRU corresponding to the absolute value of the difference value is a cooperative RRU of the user equipment;
and when the absolute values of all the difference values are larger than the preset CoMP threshold, the user equipment is a non-CoMP user, and the processing flow is quitted.
Further, the calculating sub-module in the second determining module is configured to calculate difference values between uplink SINR measured by the target RRU and uplink SINR measured by RRUs other than the target RRU, respectively; and the determining module in the second determining module is configured to determine, when the difference is smaller than or equal to a preset uplink SINR difference threshold, the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRU corresponding to the difference.
The target RRU202 is configured to perform coordinated multi-point transmission CoMP equalization processing on the received user data in combination with the coordinated RRU 203.
Further, when the target RRU202 and the cooperative RRU203 are RRUs with the same number of antennas, the cooperative RRU203 is configured to perform Discrete Fourier Transform (DFT) processing on the received user data, and send the obtained first CoMP data to the target RRU 202;
the target RRU202 is configured to perform DFT processing on the received user data to obtain second CoMP data, and perform interference suppression and combining processing on the first CoMP data and the second CoMP data.
Further, when the target RRU and the cooperating RRU are RRUs with different numbers of antennas,
the cooperative RRU203 is configured to perform DFT processing on user data received by a preset number of antennas, and send obtained third CoMP data to the target RRU 202; the target RRU202 is configured to perform DFT processing on the received user data to obtain second CoMP data, and perform interference suppression and combining processing on the third CoMP data and the second CoMP data; or,
the target RRU202 is configured to perform DFT processing on the received user data, and send the obtained second CoMP data to the cooperative RRU 203; the cooperative RRU203 is configured to perform DFT processing on user data received by a preset number of antennas to obtain third CoMP data, and perform interference suppression and combining processing on the third CoMP data and the second CoMP data; or,
the cooperative RRU203 is configured to perform DFT processing, interference suppression combining processing, and Inverse Discrete Fourier Transform (IDFT) on the received user data in sequence to obtain fifth CoMP data, and send the fifth CoMP data to the target RRU 202; the target RRU202 is configured to perform DFT processing, interference suppression combining processing, and IDFT on the received user data in sequence to obtain sixth CoMP data; and performing maximum ratio combining processing on the fifth CoMP data and the sixth CoMP data.
It should be noted that the target RRU202 and the cooperative RRU203 may exist independently as two devices, but the target RRU202 and the cooperative RRU203 belong to one base station.
The embodiment of the invention provides a device for multi-remote radio unit common-cell coordinated multi-point transmission, which is used for determining a target RRU of user equipment according to at least two Remote Radio Units (RRUs) of the same base station through a processor; determining a cooperative RRU of the user equipment according to the target RRU and RRUs except the target RRU; the target RRU is used for carrying out coordinated multi-point transmission CoMP equalization processing on the received user data jointly with the coordinated RRU, so that the uplink demodulation performance can be improved, and the user disconnection rate can be reduced.
Example 2
An embodiment of the present invention provides a method for multi-radio remote unit co-cell coordinated multi-point transmission, where an execution subject of the method is a base station, and as shown in fig. 1, the method includes:
step 101, according to at least two RRUs of the same base station, the base station determines a target RRU of user equipment;
it should be noted that at least two RRUs are configured to be the same logical cell, that is, at least two RRUs belong to the same base station, and at least include a target RRU and a cooperating RRU.
Optionally, obtaining uplink signal to interference plus noise ratio (SINR) measured by at least two Radio Remote Units (RRUs) of the same base station; and determining the RRU corresponding to the maximum uplink SINR in the uplink SINRs as a target RRU of the user equipment.
Step 102, the base station determines a cooperative RRU of the user equipment according to the target RRU and RRUs other than the target RRU;
the cooperative RRU can be determined in the following two ways:
the first method is as follows: and determining the cooperative RRU of the user equipment according to the Reference Signal Received Power (RSRP) measured by the target RRU and the uplink RSRP measured by the RRUs except the target RRU. As shown in fig. 3, the method comprises the following steps:
step 301, acquiring an uplink RSRP measured by a target RRU, and marking as RSRP (0);
step 302, obtaining uplink RSRP measured by RRUs except for the target RRU, and sequencing the measured uplink RSRP from high to low, and recording as RSRP (i), where i is 1, 2, … N-1, where N is the number of RRUs in the same base station;
step 303, calculating an absolute value of a difference between RSRP (0) and RSRP (i), that is, calculating an absolute value of a difference between uplink RSRP according to D [ i ] ═ abs [ RSRP (0) -RSRP (i) ], where i is 1, 2, 3 … N-1.
Step 304, judging whether the D [ i ] is larger than a preset CoMP threshold;
optionally, the preset CoMP threshold may be 6dB or 10 dB.
305, when the D [ i ] is larger than the preset CoMP threshold, the user equipment is a non-CoMP user, and the processing flow exits;
step 306, when the D [ i ] is less than or equal to the preset CoMP threshold, judging whether the RRUs corresponding to the D [ i ] are the RRUs with the same number of antennas;
it should be noted that when at least two RRUs satisfying the preset CoMP threshold are provided, it is further determined whether the RRUs corresponding to the dj are the RRUs with the same number of antennas; when only one RRU satisfying the preset CoMP threshold is used, the RRU satisfying the condition is directly determined to be a cooperative RRU.
Step 307, when the RRUs corresponding to the dj are the RRUs with the same number of antennas, determining the RRU corresponding to the absolute value of the minimum difference in the dj as a cooperative RRU of the user equipment;
the same number of antennas of RRUs may be 2 antennas of RRUs, or may be 8 antennas of RRUs.
And 308, when the RRUs corresponding to the D [ i ] are the RRUs with different antenna numbers, determining the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRU corresponding to the D [ i ].
The RRUs with different antenna numbers may be 2-antenna RRUs and 8-antenna RRUs.
The second method comprises the following steps: determining the cooperative RRU of the user equipment according to the uplink SINR measured by the target RRU and the uplink SINR measured by RRUs except the target RRU; as shown in fig. 4, the method comprises the following steps:
step 401, respectively calculating the difference between the uplink SINR measured by the target RRU and the uplink SINR measured by the RRUs other than the target RRU;
step 402, judging whether the calculated difference is less than or equal to a preset uplink SINR difference threshold;
step 403, when the difference is smaller than or equal to a preset uplink SINR difference threshold, determining the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRU corresponding to the difference.
And step 404, when the difference is greater than the preset uplink SINR difference threshold, the user equipment is a non-CoMP user, and the processing flow exits.
103, performing coordinated multi-point transmission CoMP equalization processing on the received user data according to the target RRU and the coordinated RRU to obtain demodulation data of the user equipment;
the following two equalization schemes can be adopted in this step according to the number of antennas of the target RRU and the cooperative RRU:
optionally, when the target RRU and the cooperative RRU are RRUs with the same number of antennas, for example, when the target RRU and the cooperative RRU are both 2-antenna RRUs, as shown in fig. 5, the cooperative RRU performs Discrete Fourier Transform (DFT) processing on user data received by the 2 antennas, that is, converts time domain data to a frequency domain, obtains first CoMP data, and sends the obtained first CoMP data to the target RRU;
while the cooperative RRU processes the received user data, the target RRU performs DFT processing on the user data received by the 2 antennas to obtain second CoMP data; the target RRU receives first CoMP data sent by the cooperative RRU, and performs Interference Rejection Combining (IRC) processing on the first CoMP data and the second CoMP data, that is, performs joint IRC equalization on RRUs with 4 antennas.
After the equalization processing, the target RRU sequentially performs Inverse Discrete Fourier Transform (IDFT), Quadrature Amplitude Modulation (QAM), deinterleaving operation, Hybrid Automatic repeat request (HARQ) combining, and Turbo decoding Turbo Decode to obtain demodulated data of the user equipment.
Optionally, when the target RRU and the cooperative RRU are RRUs with different antenna numbers, for example, the target RRU is a 2-antenna RRU, and the cooperative RRU is an 8-antenna RRU, as shown in fig. 6, the cooperative RRU performs DFT processing on user data received by a preset number of antennas, that is, time domain data is converted into frequency domain, and optionally, performs DFT processing on user data received by any 6 antennas in the 8-antenna RRUs to obtain third CoMP data; sending the obtained third CoMP data to a target RRU; the target RRU performs DFT processing on the user data received by the 2 antennas while the cooperative RRU performs DFT processing on the received user data to obtain second CoMP data; the target RRU receives third CoMP data sent by the cooperative RRU, and carries out interference suppression and merging processing on the third CoMP data and the second CoMP data;
or, the target RRU performs DFT processing on the user data received by the 2 antennas to obtain second CoMP data; the target RRU sends the obtained second CoMP data to the cooperative RRU; performing DFT processing on the received user data by the target RRU, and simultaneously performing DFT processing on the user data received by a preset number of antennas by the cooperative RRU, optionally performing DFT processing on the user data received by any 6 antennas among 8 antennas in the RRU, and obtaining third CoMP data; and the cooperative RRU receives second CoMP data sent by the target RRU, and performs interference suppression and combination processing on the third CoMP data and the second CoMP data.
It should be noted that after performing the equalization processing, the target RRU sequentially performs IDFT, QAM, deinterleave operation, HARQ combining, and Turbo decoding Turbo Decode to obtain the demodulation data of the user equipment.
Optionally, when the target RRU and the cooperative RRU are RRUs with different antenna numbers, for example, the target RRU is a 2-antenna RRU, and the cooperative RRU is an 8-antenna RRU, the method described below may be further adopted to perform CoMP equalization processing, as shown in fig. 7, the cooperative RRU performs DFT processing, interference rejection combining processing, and inverse discrete fourier transform IDFT on user data received by 8 antennas in sequence, obtains fifth CoMP data, and sends the fifth CoMP data to the target RRU; while the cooperative RRU processes the user data received by the 8 antennas, the target RRU sequentially performs DFT processing, interference rejection combining processing, and IDFT on the user data received by the 2 antennas to obtain sixth CoMP data; a target RRU receives fifth CoMP data sent by a cooperative RRU, and performs Maximum Ratio Combining (MRC) processing on the fifth CoMP data and the sixth CoMP data;
it should be noted that, after performing the equalization processing, the target RRU sequentially performs QAM, deinterleave operation, HARQ combining, and Turbo decoding Turbo Decode to obtain the demodulation data of the user equipment.
The method for multi-RRU co-cell coordinated multi-point transmission provided by the embodiment of the invention can be used for receiving and processing UE data through a plurality of uplink RRUs in a combined manner, thereby further improving the uplink demodulation performance of users in RRU overlapping areas and reducing the user disconnection rate.
An embodiment of the present invention provides an apparatus for multi-radio remote unit co-cell coordinated multi-point transmission, where the apparatus may be a base station, and as shown in fig. 8, the apparatus includes: the system comprises a processor 801, a first determining module 8011, a calculating sub-module 80111, a determining sub-module 80112, a second determining module 8012, a calculating sub-module 80121, a determining sub-module 80122, a target RRU802, and a cooperative RRU 803;
a processor 801, configured to determine a target RRU of a user equipment according to at least two remote radio units RRUs; determining a cooperative RRU of the user equipment according to the target RRU and RRUs except the target RRU;
at least two remote radio units RRUs belong to the apparatus for multi-remote radio unit co-cell coordinated multipoint transmission in this embodiment, that is, belong to one base station.
Further, the processor 801 is configured to: acquiring uplink signal to interference plus noise ratio (SINR) measured by at least two RRUs; and determining the RRU corresponding to the maximum uplink SINR in the uplink SINRs as a target RRU of the user equipment.
Further, a first determining module 8011 in the processor 801 is configured to determine a cooperative RRU of the user equipment according to an uplink RSRP measured by the target RRU and an uplink RSRP measured by an RRU other than the target RRU; or,
a second determining module 8012 in the processor 801 is configured to determine the RRU for cooperation with the user equipment according to the uplink SINR measured by the target RRU and uplink SINRs measured by RRUs other than the target RRU.
It should be noted that at least one of the first determining module 8011 and the second determining module 8012 is included in the processor 801.
Further, the calculating sub-module 80111 in the first determining module 8011 is configured to calculate an absolute value of a difference between the uplink RSRP measured by the target RRU and the uplink RSRP measured by each RRU except the target RRU, respectively;
a determining sub-module 80112 of the first determining module 8011 is configured to determine a cooperating RRU of the user equipment according to an absolute value of the difference. Specifically, the determining sub-module 80112 is configured to determine, when the absolute values of at least two of the difference values are smaller than or equal to a preset CoMP threshold, and the RRUs corresponding to the absolute values of the at least two difference values are the RRUs with the same number of antennas, the RRU corresponding to the absolute value of the smallest difference value of the at least two difference values is the cooperative RRU of the user equipment; when the absolute values of at least two difference values are smaller than or equal to a preset CoMP threshold and the RRUs corresponding to the at least two difference values are RRUs with different antenna numbers, determining the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRUs corresponding to the at least two difference values; when only one absolute value of the difference value is smaller than or equal to a preset CoMP threshold, determining that the RRU corresponding to the absolute value of the difference value is a cooperative RRU of the user equipment; and when the absolute values of all the difference values are larger than the preset CoMP threshold, the user equipment is a non-CoMP user, and the processing flow is quitted.
Further, the calculating sub-module 80121 in the second determining module 8012 is configured to calculate a difference between the uplink SINR measured by the target RRU and uplink SINRs measured by RRUs other than the target RRU, respectively;
the determining module 80122 in the second determining module 8012 is configured to determine, when the difference is smaller than or equal to a preset uplink SINR difference threshold, the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRU corresponding to the difference.
The target RRU802 is configured to perform coordinated multi-point transmission CoMP equalization processing on the received user data in combination with the coordinated RRU 803.
Further, when the target RRU802 and the cooperative RRU803 are RRUs with the same number of antennas, the cooperative RRU803 is configured to perform Discrete Fourier Transform (DFT) processing on the received user data, and send the obtained first CoMP data to the target RRU 802;
the target RRU802 is configured to perform DFT processing on the received user data to obtain second CoMP data, and perform interference suppression and combining processing on the first CoMP data and the second CoMP data.
Further, when the target RRU802 and the cooperative RRU803 are RRUs with different antenna numbers, the cooperative RRU803 is configured to perform DFT processing on user data received by a preset number of antennas, and send obtained third CoMP data to the target RRU 802; the target RRU802 is configured to perform DFT processing on the received user data to obtain second CoMP data, and perform interference suppression and combining processing on the third CoMP data and the second CoMP data; or,
the target RRU802 is configured to perform DFT processing on the received user data, and send the obtained second CoMP data to the cooperative RRU 803; the cooperative RRU803 is configured to perform DFT processing on user data received by a preset number of antennas to obtain third CoMP data, and perform interference suppression and combining processing on the third CoMP data and the second CoMP data; or,
the cooperative RRU803 is configured to perform DFT processing, interference suppression combining processing, and Inverse Discrete Fourier Transform (IDFT) on the received user data in sequence to obtain fifth CoMP data, and send the fifth CoMP data to the target RRU 802; the target RRU802 is configured to perform DFT processing, interference suppression combining processing, and IDFT on the received user data in sequence to obtain sixth CoMP data; and performing maximum ratio combining processing on the fifth CoMP data and the sixth CoMP data.
It should be noted that the target RRU802 and the cooperative RRU803 may exist independently as two devices, but the target RRU802 and the cooperative RRU803 belong to one base station.
The embodiment of the invention provides a device for multi-remote radio unit common-cell coordinated multi-point transmission, which is used for determining a target RRU of user equipment according to at least two Remote Radio Units (RRUs) of the same base station through a processor; determining a cooperative RRU of the user equipment according to the target RRU and RRUs except the target RRU; the target RRU is used for carrying out coordinated multi-point transmission CoMP equalization processing on the received user data jointly with the coordinated RRU, so that the uplink demodulation performance can be improved, and the user disconnection rate can be reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (14)

1. A method for multi-radio remote unit co-cell coordinated multi-point transmission is characterized by comprising the following steps:
determining a target RRU of user equipment according to at least two RRUs of the same base station;
determining a cooperative RRU of the user equipment according to the target RRU and RRUs except the target RRU;
performing coordinated multi-point transmission (CoMP) equalization processing on the received user data by the target RRU and the coordinated RRU to obtain demodulation data of the user equipment;
wherein, when the target RRU and the cooperating RRU are RRUs with the same number of antennas, performing, by the target RRU and the cooperating RRU, coordinated multi-point transmission CoMP equalization processing on the received user data includes:
the cooperation RRU in the base station performs Discrete Fourier Transform (DFT) processing on the received user data, and sends the obtained first CoMP data to the target RRU in the base station;
and the target RRU performs DFT processing on the received user data to obtain second CoMP data, and performs interference suppression and combination processing on the first CoMP data and the second CoMP data.
2. The method of claim 1, wherein the determining the target RRU of the user equipment according to at least two RRUs of the same base station comprises:
acquiring uplink signal to interference plus noise ratio (SINR) measured by at least two RRUs of the same base station;
and determining the RRU corresponding to the maximum uplink SINR in the uplink SINRs as a target RRU of the user equipment.
3. The method of claim 2, wherein the determining the cooperative RRU of the user equipment according to the target RRU and RRUs other than the target RRU comprises:
determining a cooperative RRU of the user equipment according to the uplink Reference Signal Received Power (RSRP) measured by the target RRU and the uplink RSRP measured by RRUs except the target RRU; or,
and determining the cooperative RRU of the user equipment according to the uplink SINR measured by the target RRU and the uplink SINR measured by RRUs except the target RRU.
4. The method of claim 3, wherein the determining the RRUs cooperating with the user equipment according to the uplink RSRP measured by the target RRU and the uplink RSRP measured by RRUs other than the target RRU comprises:
respectively calculating the absolute value of the difference value of the uplink RSRP measured by the target RRU and the uplink RSRP measured by each RRU except the target RRU;
and determining the cooperative RRU of the user equipment according to the absolute value of the difference value.
5. The method of claim 4, wherein the determining the RRU for the user equipment according to the absolute value of the difference comprises:
when the absolute values of at least two of the difference values are smaller than or equal to a preset CoMP threshold and the RRUs corresponding to the absolute values of the at least two difference values are the RRUs with the same number of antennas, determining the RRU corresponding to the absolute value of the minimum difference value in the absolute values of the at least two difference values as a cooperative RRU of the user equipment;
when the absolute values of at least two of the difference values are smaller than or equal to a preset CoMP threshold and the RRUs corresponding to the absolute values of the at least two difference values are RRUs with different antenna numbers, determining the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRUs corresponding to the absolute values of the at least two difference values;
when only one absolute value of the difference is smaller than or equal to a preset CoMP threshold, determining that the RRU corresponding to the absolute value of the difference is a cooperative RRU of the user equipment;
and when the absolute values of all the difference values are larger than the preset CoMP threshold, the user equipment is a non-CoMP user, and the processing flow is quitted.
6. The method of claim 3, wherein the determining the RRU for the user equipment according to the uplink SINR measured by the target RRU and the uplink SINR measured by RRUs other than the target RRU comprises:
respectively calculating the difference value of the uplink SINR measured by the target RRU and the uplink SINR measured by RRUs except the target RRU;
and when the difference is smaller than or equal to a preset uplink SINR difference threshold, determining the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRU corresponding to the difference.
7. The method of claim 1, wherein when the target RRU and the cooperating RRU are RRUs with different antenna numbers, the performing, by the target RRU and the cooperating RRU, coordinated multi-point transmission, CoMP, equalization processing on the received user data further comprises:
the cooperative RRU in the base station performs DFT processing on user data received by a preset number of antennas, and sends the obtained third CoMP data to the target RRU in the base station; the target RRU carries out DFT processing on the received user data to obtain second CoMP data, and carries out interference suppression and combination processing on the third CoMP data and the second CoMP data; or,
the target RRU in the base station performs DFT processing on the received user data, and sends the obtained second CoMP data to the cooperative RRU in the base station; the cooperative RRU performs DFT processing on user data received by a preset number of antennas to obtain third CoMP data, and performs interference suppression and combination processing on the third CoMP data and the second CoMP data; or,
the cooperative RRU in the base station sequentially performs DFT processing, interference suppression combining processing and Inverse Discrete Fourier Transform (IDFT) on the received user data to obtain fifth CoMP data, and sends the fifth CoMP data to the target RRU; meanwhile, the target RRU in the base station sequentially performs DFT processing, interference suppression combining processing and IDFT on the received user data to obtain sixth CoMP data; and the target RRU performs maximum ratio combining processing on the fifth CoMP data and the sixth CoMP data.
8. An apparatus for multi-radio remote unit co-cell coordinated multi-point transmission, comprising:
the processor is used for determining a target RRU of the user equipment according to the at least two RRUs; determining a cooperative RRU of the user equipment according to the target RRU and RRUs except the target RRU;
the target RRU is used for carrying out coordinated multi-point transmission (CoMP) equalization processing on the received user data in combination with the coordinated RRU;
when the target RRU and the cooperating RRU are RRUs of the same number of antennas,
the cooperative RRU is used for performing Discrete Fourier Transform (DFT) processing on the received user data and sending the obtained first CoMP data to the target RRU;
the target RRU is configured to perform DFT processing on the received user data to obtain second CoMP data, and perform interference suppression and combining processing on the first CoMP data and the second CoMP data.
9. The apparatus of claim 8, wherein the processor is configured to:
acquiring uplink signal to interference plus noise ratio (SINR) measured by at least two RRUs; and determining the RRU corresponding to the maximum uplink SINR in the uplink SINRs as a target RRU of the user equipment.
10. The apparatus of claim 9, wherein the processor comprises:
a first determining module, configured to determine a cooperative RRU of the user equipment according to an uplink RSRP measured by the target RRU and uplink RSRPs measured by RRUs other than the target RRU; or,
and a second determining module, configured to determine a cooperative RRU of the user equipment according to the uplink SINR measured by the target RRU and uplink SINRs measured by RRUs other than the target RRU.
11. The apparatus of claim 10, wherein the first determining module comprises:
the calculation submodule is used for calculating the absolute value of the difference value of the uplink RSRP measured by the target RRU and the uplink RSRP measured by each RRU except the target RRU;
and the determining submodule is used for determining the cooperative RRU of the user equipment according to the absolute value of the difference value.
12. The apparatus of claim 11, wherein the determination submodule is configured to:
when the absolute values of at least two of the difference values are smaller than or equal to a preset CoMP threshold and the RRUs corresponding to the absolute values of the at least two difference values are the RRUs with the same number of antennas, determining the RRU corresponding to the absolute value of the minimum difference value in the absolute values of the at least two difference values as a cooperative RRU of the user equipment;
when the absolute values of at least two difference values are smaller than or equal to a preset CoMP threshold and the RRUs corresponding to the at least two difference values are RRUs with different antenna numbers, determining the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRUs corresponding to the at least two difference values;
when only one absolute value of the difference value is smaller than or equal to a preset CoMP threshold, determining that the RRU corresponding to the absolute value of the difference value is a cooperative RRU of the user equipment;
and when the absolute values of all the difference values are larger than the preset CoMP threshold, the user equipment is a non-CoMP user, and the processing flow is quitted.
13. The apparatus of claim 10, wherein the second determining module comprises:
a calculation sub-module, configured to calculate a difference between the SINR measured by the target RRU and the SINR measured by RRUs other than the target RRU, respectively;
and the determining submodule is used for determining the RRU corresponding to the maximum uplink SINR as the cooperative RRU of the user equipment according to the uplink SINR measured by the RRU corresponding to the difference when the difference is smaller than or equal to the preset uplink SINR difference threshold.
14. The apparatus of claim 8, wherein when the target RRU and the cooperating RRU are RRUs with different antenna numbers,
the cooperative RRU is used for performing DFT processing on user data received by a preset number of antennas and sending the obtained third CoMP data to the target RRU; the target RRU is used for performing DFT processing on the received user data to obtain second CoMP data, and performing interference suppression and combination processing on the third CoMP data and the second CoMP data; or,
the target RRU is used for performing DFT processing on the received user data and sending the obtained second CoMP data to the cooperative RRU; the cooperative RRU is used for performing DFT processing on user data received by a preset number of antennas to obtain third CoMP data, and performing interference suppression and combination processing on the third CoMP data and the second CoMP data; or,
the cooperative RRU is used for sequentially performing DFT processing, interference suppression and combination processing and Inverse Discrete Fourier Transform (IDFT) on the received user data to obtain fifth CoMP data and sending the fifth CoMP data to the target RRU; the target RRU is used for sequentially performing DFT processing, interference suppression and combination processing and IDFT on the received user data to obtain sixth CoMP data; and performing maximum ratio combining processing on the fifth CoMP data and the sixth CoMP data.
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