CN111385861A - Interference coordination method and device for downlink service channel - Google Patents

Interference coordination method and device for downlink service channel Download PDF

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CN111385861A
CN111385861A CN201811640634.8A CN201811640634A CN111385861A CN 111385861 A CN111385861 A CN 111385861A CN 201811640634 A CN201811640634 A CN 201811640634A CN 111385861 A CN111385861 A CN 111385861A
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reference signal
cell
common reference
downlink
downlink common
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CN111385861B (en
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陶雄强
王姗
朱莉森
张瑞
周欣
张乐阳
冯绍鹏
池连刚
冯世英
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Potevio Information Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

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Abstract

The embodiment of the invention provides a method and a device for coordinating downlink service channel interference, wherein the method comprises the following steps: receiving a neighbor cell no-load identifier reported by a terminal, an SINR on an RE where a downlink common reference signal of the cell is located, and an SINR on the RE where the downlink common reference signal of the neighbor cell is located, wherein the neighbor cell no-load identifier is used for indicating whether the neighbor cell is in no-load; when the no-load identification of the adjacent cell indicates no-load of the adjacent cell, when downlink service data is sent to a terminal, the transmitting power of data RE interfered by a downlink common reference signal of the adjacent cell is enhanced according to a first specified proportion; and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion. The embodiment of the invention can realize the power coordination of the interference of the adjacent cell under the no-load condition of the adjacent cell of the cell edge terminal under the no-load condition of the adjacent cell so as to improve the demodulation performance of the terminal under the condition and ensure the downlink data transmission rate of the terminal.

Description

Interference coordination method and device for downlink service channel
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a downlink traffic channel interference coordination method and device.
Background
LTE, as a 4G mainstream technology, provides users with high-speed data transmission services. In some application scenarios based on the LTE technology, for example, data acquisition of a smart power grid of a power system, due to scarcity of frequency resources, a common-frequency networking mode is adopted, so that precious frequency resources can be saved, and system capacity can be improved. Therefore, how to solve the problem of mutual interference between adjacent cells in the same-frequency networking becomes an important research topic.
When the smart grid data acquisition system adopts the same-frequency networking, for cell edge users, when a general network plans a cell ID, positions of REs (resource elements) mapped by downlink common reference signal (cell specific reference signal) resources of adjacent cells are staggered, that is, downlink common reference signals of adjacent cells are time-division or frequency-division to avoid mutual interference between the downlink common reference signals, but interference of the downlink common reference signals of the adjacent cells to downlink service data symbols of the cell cannot be avoided.
When the neighboring cell is idle (that is, the neighboring cell only transmits the downlink cell common reference Signal, and no downlink service data is transmitted), because there is no data Signal transmitted by the neighboring cell on the RE mapped by the downlink cell common reference Signal of the cell, the SINR (Signal to Interference plus Noise Ratio) calculated by the cell according to the received pilot Signal is very high, and the Interference situation of the downlink cell common reference Signal of the neighboring cell on the data Signal of the cell cannot be reflected. However, the downlink service data of the cell may be degraded due to interference caused by the common reference signal of the neighboring cell, and especially when the power of the downlink common reference signal transmitted by the neighboring cell eNB (base station) received by the cell edge user is greater than or equal to the power of the downlink service data transmitted by the cell eNB, the signal reception quality on the interfered data RE may be degraded, which may cause a serious impact on the downlink service data of the cell, especially on the high-order modulation reception performance such as high MCS or 16QAM, 64QAM, and the like.
Generally, for cell edge users, because of coverage problems, the eNB selects a larger number of repetitions to improve performance when performing traffic data scheduling. However, when the same frequency interference of the neighboring cell is large, because the downlink common reference signal of the neighboring cell is sent by all downlink subframes in each wireless frame, although the service data of the cell is repeatedly sent in a plurality of wireless frames, the reception quality of the signal on the interfered data RE of the cell still cannot be improved by the combined reception of the receiving end, so that the demodulation performance of the whole downlink service data is seriously affected, the transmission rate of the downlink service data is reduced, and particularly, the performance is greatly reduced when high-order modulation such as high MCS (modulation and coding scheme) or 16QAM, 64QAM and the like is performed.
Disclosure of Invention
Aiming at the technical problems in the prior art, embodiments of the present invention provide a method and an apparatus for downlink traffic channel interference coordination.
In a first aspect, an embodiment of the present invention provides a downlink traffic channel interference coordination method, where the method includes:
receiving a neighbor cell no-load identifier reported by a terminal, an SINR on an RE where a downlink common reference signal of the cell is located, and an SINR on the RE where the downlink common reference signal of the neighbor cell is located, wherein the neighbor cell no-load identifier is used for indicating whether the neighbor cell is in no-load;
when the no-load identification of the adjacent cell indicates that the adjacent cell is no-load, when downlink service data are sent to a terminal, according to the SINR on the RE where the downlink common reference signal of the cell is located and the SINR on the RE where the downlink common reference signal of the adjacent cell is located, the transmitting power of the data RE interfered by the downlink common reference signal of the adjacent cell is enhanced according to a first specified proportion; and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion.
Optionally, when there is N for RE mapped by downlink common reference signal of the cell in the OFDM symbol where the RE interfered by downlink common reference signal of the neighboring cell is located1Number of one, position number miThe RE mapped by the corresponding adjacent cell downlink common reference signal has Ni+1Wherein m isiThe position number of the downlink common reference signal of the adjacent cell reported by the UE is numbered, if the position number m is numberediAfter the power of the complex value symbol on the RE mapped by the corresponding adjacent cell downlink common reference signal is enhanced, the amplitude of the complex value symbol is changed into the original Ai+1After the power of the complex value symbol on the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the neighboring cell is located is reduced, the amplitude of the complex value symbol is changed into the original A1The power of the downlink common reference signal in the cell is kept unchanged, then A1The calculation formula of (a) is as follows:
Figure BDA0001931049640000031
wherein, M is the number of subcarriers scheduled by a user downlink shared channel, ρ is the offset between the receiving power and the data power of the cell reference signal, and n is the number of position numbers of the downlink common reference signals of the neighboring cell reported by the UE.
In a second aspect, an embodiment of the present invention provides a downlink traffic channel interference coordination apparatus, where the apparatus includes:
a first receiving unit, configured to receive a no-load identifier of a neighboring cell, an SINR on an RE where a downlink common reference signal of the current cell is located, and an SINR on an RE where a downlink common reference signal of the neighboring cell is located, where the no-load identifier of the neighboring cell is used to indicate whether the neighboring cell is idle;
the coordination unit is used for enhancing the transmitting power of the data RE interfered by the downlink common reference signal of the adjacent cell according to a first specified proportion according to the SINR on the RE where the downlink common reference signal of the cell is located and the SINR on the RE where the downlink common reference signal of the adjacent cell is located when the idle load identification of the adjacent cell indicates the idle load of the adjacent cell and when downlink service data is sent to the terminal; and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion.
Optionally, when there is N for RE mapped by downlink common reference signal of the cell in the OFDM symbol where the RE interfered by downlink common reference signal of the neighboring cell is located1Number of one, position number miThe RE mapped by the corresponding adjacent cell downlink common reference signal has Ni+1Wherein m isiThe position number of the downlink common reference signal of the adjacent cell reported by the UE is numbered, if the position number m is numberediAfter the power of the complex value symbol on the RE mapped by the corresponding adjacent cell downlink common reference signal is enhanced, the amplitude of the complex value symbol is changed into the original Ai+1After the power of the complex value symbol on the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the neighboring cell is located is reduced, the amplitude of the complex value symbol is changed into the original A1The power of the downlink common reference signal in the cell is kept unchanged, then A1The calculation formula of (a) is as follows:
Figure BDA0001931049640000032
wherein, M is the number of subcarriers scheduled by a user downlink shared channel, ρ is the offset between the receiving power and the data power of the cell reference signal, and n is the number of position numbers of the downlink common reference signals of the neighboring cell reported by the UE.
In a third aspect, an embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method provided in the first aspect when executing the program.
In a fourth aspect, an embodiment of the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the method as provided in the first aspect.
In the embodiment of the invention, under the condition of no load of the adjacent cell, the power coordination of the interference of the adjacent cell under the condition of no load of the adjacent cell of the cell edge terminal is realized by enhancing the transmitting power of the RE interfered by the downlink common reference signal of the adjacent cell and reducing the transmitting power of the rest data RE of the downlink service channel of the OFDM symbol of the interfered RE, so that the demodulation performance of the terminal under the condition is improved, and the transmission rate of the downlink data of the terminal is ensured.
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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 some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a power coordination method for interference to a neighboring cell when the neighboring cell of a downlink traffic channel cell edge terminal is idle according to an embodiment of the present invention;
fig. 2 is a schematic diagram of repeated transmission of a downlink traffic channel in a plurality of radio frames;
fig. 3 is a schematic diagram of a power coordination method for interference to a neighboring cell under an idle condition of the neighboring cell of a downlink traffic channel cell edge terminal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power coordination apparatus for interference to a neighboring cell when the neighboring cell of a downlink traffic channel cell edge terminal is idle according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The role of the downlink common reference signal (cell-specific reference signal) of the LTE system is to perform channel estimation by inserting pilot signals at different time and frequency ends, which herein refers to downlink pilot signals for channel estimation and related demodulation of all downlink transmission techniques except codebook-based beamforming techniques, and specifically, a pseudo-random sequence generated by a gold sequence can be used as a pilot signal of a downlink. Cell-specific means that this reference signal corresponds to the number of antenna ports (antenna ports 0-3) between base stations of one cell. Downlink control or traffic data is sent on the first 13 OFDM (Orthogonal Frequency Division Multiplexing) symbols of each radio frame, and the RE position mapped by the downlink pilot signal is only related to the cell ID.
Fig. 1 is a flowchart illustrating a downlink traffic channel interference coordination method according to an embodiment of the present invention.
As shown in fig. 1, the method specifically includes the following steps:
s11, receiving the idle load identification of the adjacent cell reported by the terminal, the SINR on the RE where the downlink common reference signal of the cell is located and the SINR on the RE where the downlink common reference signal of the adjacent cell is located, wherein the idle load identification of the adjacent cell is used for indicating whether the adjacent cell is idle;
specifically, when the neighboring cell is idle, the neighboring cell only transmits the cell-specific reference signal, and does not transmit the service data.
The embodiment of the invention judges the idle load condition of the adjacent region through the terminal, and the idle load condition is carried in the idle load identifier of the adjacent region and reported to the base station. The method for judging the no-load of the adjacent region by the terminal is elaborated in the application document with the application number of '201010172874.7' and the invention name of 'a measuring method for measuring the signal-to-interference-and-noise ratio and the terminal': and if the residual power of the terminal on the cell reference signal position of the adjacent cell except the interference power of the adjacent cell is greater than or equal to a second preset value, judging that the cell is fully loaded, otherwise, judging that the cell is unloaded. The embodiments of the present invention will not be described in detail.
S12, when the no-load mark of the adjacent cell indicates that the adjacent cell is no-load, when downlink service data are sent to the terminal, the transmitting power of the data RE interfered by the downlink common reference signal of the adjacent cell is enhanced according to a first specified proportion according to the SINR on the RE where the downlink common reference signal of the cell is located and the SINR on the RE where the downlink common reference signal of the adjacent cell is located; and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion.
Specifically, for the physical downlink shared channel, one transport block may be mapped to multiple radio frames for transmission, and to support deep coverage, one transport block may be repeatedly sent multiple times. For cell edge users, the interference of the downlink common reference signal of the neighboring cell on the downlink service data symbol of the cell can greatly affect the transmission performance of the downlink service data of the cell, and particularly when the same frequency interference of the neighboring cell is large, because the downlink common reference signal of the neighboring cell is transmitted by all downlink subframes in each wireless frame, although the service data of the cell is repeatedly transmitted in a plurality of wireless frames, the reception quality of the signal on the interfered data RE of the cell cannot be improved by the combined reception of the receiving ends, thereby causing serious impact on the demodulation performance of the whole downlink service data.
When the cell base station sends downlink service data to the terminal, the receiving quality of the cell downlink service data on the RE interfered by the downlink common reference signal of the neighboring cell is close to that of other undisturbed data RE by properly increasing the transmitting power of the RE interfered by the specific reference signal of the neighboring cell; and correspondingly reducing the transmitting power of the rest data REs of the upper and lower business channels of the OFDM symbol where the interfered REs are located so as to ensure that the total transmitting power of each OFDM symbol is kept unchanged. Specifically, the power adjustment ratio is determined according to the SINR on the RE where the downlink common reference signal of the cell is located and the SINR on the RE where the downlink common reference signal of the neighboring cell is located.
In the embodiment of the invention, under the condition of no load of the adjacent cell, the coordination of the adjacent cell interference power under the condition of no load of the adjacent cell of the cell edge terminal is realized by enhancing the transmission power of the adjacent cell interfered by the downlink common reference signal RE and reducing the transmission power of the rest data RE of the lower service channel on the OFDM symbol of the interfered RE, so that the terminal demodulation performance under the condition is improved, and the transmission rate of the downlink data of the terminal is ensured.
On the basis of the above embodiment, the relationship between the first specified ratio and the second specified ratio is as follows:
when N exists in the OFDM symbol where RE interfered by the downlink common reference signal of the adjacent region is located1RE mapped by downlink common reference signal of local cell has N2Number of each position m1RE mapped by corresponding adjacent cell downlink common reference signal has N3Number of each position m2RE … … mapped by corresponding neighbor downlink common reference signal has Nn+1Number of each position mnAnd RE mapped by the corresponding neighbor downlink common reference signal. Wherein m is1、m2……mnAnd numbering the positions of the downlink common reference signals of the adjacent cells reported by the UE.
If the pair of position numbers m1After the power of the complex-valued symbol on the RE mapped by the corresponding adjacent cell downlink common reference signal is enhanced, the amplitude of the complex-valued symbol is changed into the original A2Multiple, number position m2RE complex mapped by corresponding neighbor downlink common reference signalAfter the power of the numerical symbol is enhanced, the amplitude of the complex-valued symbol becomes the original A3Multiple … …, position number mnAfter the power of the complex-valued symbol on the RE mapped by the corresponding adjacent cell downlink common reference signal is enhanced, the amplitude of the complex-valued symbol is changed into the original An+1After the power of the complex value symbol on the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the neighboring cell is located is reduced, the amplitude of the complex value symbol is changed into the original A1Multiple, then A1The calculation formula of (a) is as follows:
Figure BDA0001931049640000071
wherein, M is the number of subcarriers scheduled by the user downlink shared channel, ρ is a related parameter obtained according to downlink power allocation defined in the 3GPP 36.213 protocol, that is, the offset between the received power of the cell reference signal and the data power, and n is the number of position numbers of the downlink common reference signal of the neighboring cell reported by the UE.
The specific method for adjusting the power of the embodiment of the invention comprises the following steps: suppose that N is in the local cell in a certain OFDM symbol1A reference signal RE, position number m1After the power of the complex-valued symbol on the RE mapped by the corresponding adjacent cell downlink common reference signal is enhanced, the amplitude of the complex-valued symbol is changed into the original A2Multiple, number position m2After RE complex-valued symbol power mapped by the corresponding neighbor downlink common reference signal is enhanced, the complex-valued symbol amplitude is changed into the original A3Multiple … …, position number mnAfter the power of the complex-valued symbol on the RE mapped by the corresponding adjacent-cell downlink common reference signal is enhanced, the amplitude of the complex-valued symbol is changed into the original An+1Multiple (A)2……An+1Both are equal to or more than 1), the complex value symbol amplitude is changed into the original A after the complex value symbol power on the residual data RE of the OFDM symbol uplink and downlink traffic channel is reduced1Multiple, then A1Calculated according to the following formula:
Figure RE-GDA0002002861510000072
wherein, M is the number of subcarriers scheduled by a Physical Downlink Shared Channel (PDSCH), ρ is a relevant parameter obtained according to Downlink power allocation defined in a 3GPP 36.213 protocol, that is, an offset between the received power of a cell reference signal and the data power, and n is the number of position numbers of a neighboring cell Downlink common reference signal reported by the UE.
On the basis of the above embodiment, the method further includes:
and in the process of repeatedly sending the PDSCH, enhancing the transmitting power of the RE interfered by the downlink common reference signal of the adjacent region at intervals of a specified number of radio frames according to a first specified proportion, and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion.
Fig. 2 shows a schematic diagram of repeated transmission of a downlink traffic channel in a plurality of radio frames.
For repeated transmission in the same PUSCH scheduling, PUSCH transmission
Figure BDA0001931049640000081
And then, the transmission is divided into M _ PUSCH _ Number _ Of _ Cycle cycles to finish the transmission,
Figure BDA0001931049640000082
for the number of cycles transmitted by the PUSCH, one Cycle is mapped when the resources are mapped, the next Cycle is mapped, and in each Cycle, after each wireless frame is mapped, the Cycle is repeated
Figure BDA0001931049640000083
A radio frame and then maps the following radio frames. Different cycles use HARQ redundancy version numbers 0 and 2 in LTE.
As shown in fig. 2: i isSF2, each TB block is rate-matched to the uplink subframe of 4 radio frames,
Figure BDA0001931049640000084
the PUSCH for transmitting the TB block is transmitted for 8 times in total and obtained according to a formula
Figure BDA0001931049640000085
Figure BDA0001931049640000086
That is, the bit sequence matched by the rate in each Cycle starts to take bits according to the starting point corresponding to the redundancy version 0 in LTE, the bits are taken out according to the bit number transmitted by the uplink subframe in the first radio frame and then transmitted for 4 times, and then the bits are taken out according to the bit number transmitted by the uplink subframe in the next radio frame and transmitted for 4 times, and thus the next Cycle is started after the bits of the length of 4 radio frames are transmitted.
In order to take into account the measurement functions of Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), and the like of cell edge users, the embodiment of the present invention performs the Power enhancement once according to a certain period, that is, a specified number of radio frames at intervals, in the process of repeatedly transmitting the PDSCH, so that the remaining repeatedly transmitted radio frames are transmitted according to the original design, that is, the Power enhancement is not performed. Therefore, the adjacent cell edge users can respectively measure the RSRP, the RSRQ and the like of the received signals which are not subjected to power enhancement.
Fig. 3 shows a power coordination method for interference to a neighboring cell under an idle condition of the neighboring cell of a downlink traffic channel cell edge terminal according to an embodiment of the present invention.
As shown in fig. 3, power boosting is performed once every 4 radio frames. And the rest wireless frames which are repeatedly sent are sent according to the original transmitting power, so that the terminal can measure the RSRP, the RSRQ and the like of the received signals which are not subjected to power enhancement.
On the basis of the above embodiment, the method further includes:
and receiving the position index number of the RE where the downlink common reference signal of the adjacent cell reported by the terminal is located, wherein the position of each downlink common reference signal corresponds to one number.
Specifically, the content reported by the terminal further includes a position index number of an RE where the neighboring cell downlink common reference signal is located, and each downlink common reference signal position corresponds to one number, so that the base station knows the accurate position of the data RE interfered by the neighboring cell downlink common reference signal and the position of the remaining data RE of the OFDM symbol downlink service channel.
On the basis of the above embodiment, the method further includes:
and adding a neighboring cell interference power coordination indication domain in downlink scheduling DCI or RRC signaling, wherein the power coordination indication domain is used for indicating the proportion of power enhancement required by a terminal at the position of data RE interfered by a neighboring cell downlink common reference signal, so that the proportion of power reduction required at the position of the residual data RE of the OFDM symbol downlink service channel is obtained according to the formula.
Specifically, the base station issues the proportion of performing power enhancement on the position of the downlink common reference signal RE of the neighboring cell that needs to perform interference power coordination to the terminal through the following two ways:
1. the real-time requirement on the no-load interference coordination of the adjacent cells is higher, and dynamic interference coordination is adopted, namely, an adjacent cell interference power coordination indication domain is added in DCI of a scheduling downlink.
For example: each neighboring cell downlink common reference signal position number indicates, using 2 bits, whether or not power enhancement is required for a complex-valued symbol RE on an RE mapped by a neighboring cell downlink common reference signal corresponding to the position number of the UE, and a ratio of the power enhancement, for example, a neighboring cell interference power coordination indication field in DCI is 4 bits, each position number is represented by applying 2 bits, and the neighboring cell interference power coordination indication field is as shown in table 1:
TABLE 1
Figure BDA0001931049640000091
The bit number of the specific adjacent cell interference power coordination indication domain is equal to the product of the index bit number of the power enhancement coefficient corresponding to each position number and the number of the position numbers. The number of the position numbers and the index bit number of the power enhancement coefficient corresponding to each position number can be determined according to conditions such as cell planning and simulation and the like and by combining PDCCH detection complexity.
2. When the requirement on the idle load interference coordination real-time performance of the adjacent cell is not high, semi-static interference coordination can be adopted, and the adjacent cell interference power coordination indication domain is added in the RRC signaling.
Specifically, the neighboring cell interference power coordination indication field is added to the RRC signaling, which is similar to table 1, and the bit number of the neighboring cell interference power coordination indication field is equal to the product of the power enhancement coefficient index bit number corresponding to each position number and the position number. The number of the position numbers and the index bit number of the power enhancement coefficient corresponding to each position number can be determined according to conditions such as cell planning, simulation and the like.
Fig. 4 is a schematic structural diagram illustrating a downlink traffic channel interference coordination apparatus according to an embodiment of the present invention.
As shown in fig. 4, the apparatus includes a first receiving unit 11 and a coordinating unit 12, wherein:
the first receiving unit 11 is configured to receive a no-load identifier of a neighboring cell, an SINR on an RE where a downlink common reference signal of the current cell is located, and an SINR on an RE where a downlink common reference signal of the neighboring cell is located, where the no-load identifier of the neighboring cell is used to indicate whether the neighboring cell is idle;
the coordination unit 12 is configured to, when the idle-load identifier of the neighboring cell indicates that the neighboring cell is idle, when downlink service data is sent to the terminal, enhance the transmit power of the data RE interfered by the downlink common reference signal of the neighboring cell according to a first specified ratio according to the SINR on the RE where the downlink common reference signal of the current cell is located and the SINR on the RE where the downlink common reference signal of the neighboring cell is located; and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion.
In the embodiment of the invention, under the condition of no load of the adjacent cell, the coordination of the interference power of the adjacent cell under the condition of no load of the adjacent cell of the cell edge terminal is realized by enhancing the transmitting power of the downlink common reference signal interference RE of the adjacent cell and reducing the transmitting power of the residual data RE of the downlink service channel on the OFDM symbol where the interfered RE is positioned, so that the demodulation performance of the terminal under the condition is improved, and the transmission rate of the downlink data of the terminal is ensured.
On the basis of the above embodiment, the relationship between the first specified ratio and the second specified ratio is as follows:
when N exists in the OFDM symbol where RE interfered by the downlink common reference signal of the adjacent region is located1RE mapped by downlink common reference signal of local cell has N2Number of each position m1RE mapped by corresponding adjacent cell downlink common reference signal has N3Number of each position m2RE … … mapped by corresponding neighbor downlink common reference signal has Nn+1Number of each position mnAnd RE mapped by the corresponding neighbor downlink common reference signal. Wherein m is1、m2……mnAnd numbering the positions of the downlink common reference signals of the adjacent cells reported by the UE.
If the pair of position numbers m1After the power of the complex-valued symbol on the RE mapped by the corresponding adjacent cell downlink common reference signal is enhanced, the amplitude of the complex-valued symbol is changed into the original A2Multiple, number position m2After RE complex-valued symbol power mapped by corresponding adjacent-cell downlink common reference signal is enhanced, the complex-valued symbol amplitude is changed into the original A3Multiple … …, position number mnAfter the power of the complex-valued symbol on the RE mapped by the corresponding adjacent cell downlink common reference signal is enhanced, the amplitude of the complex-valued symbol is changed into the original An+1After the power of the complex value symbol on the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the neighboring cell is located is reduced, the amplitude of the complex value symbol is changed into the original A1Multiple, then A1The calculation formula of (a) is as follows:
Figure BDA0001931049640000111
wherein, M is the number of sub-carriers scheduled by the user downlink shared channel, and n is the number of position numbers of the downlink common reference signals of the neighboring cells reported by the UE.
The specific method for adjusting the power of the embodiment of the invention comprises the following steps: suppose that N is in the local cell in a certain OFDM symbol1A reference signal RE, position number m1After the power of the complex-valued symbol on the RE mapped by the corresponding adjacent cell downlink common reference signal is enhanced, the amplitude of the complex-valued symbol is changed into the original A2Multiple, number position m2After RE complex-valued symbol power mapped by the corresponding neighbor downlink common reference signal is enhanced, the complex-valued symbol amplitude is changed into the original A3Multiple … …, position number mnAfter the power of the complex-valued symbol on the RE mapped by the corresponding adjacent-cell downlink common reference signal is enhanced, the amplitude of the complex-valued symbol is changed into the original An+1Multiple (A)2……An+1Both are equal to or more than 1), the complex value symbol amplitude is changed into the original A after the complex value symbol power on the residual data RE of the OFDM symbol uplink and downlink traffic channel is reduced1Multiple, then A1Calculated according to the following formula:
Figure BDA0001931049640000112
thereby obtaining
Figure BDA0001931049640000113
Wherein, M is the number of sub-carriers scheduled by a user PUSCH (physical uplink shared channel), and n is the number of position numbers of a downlink common reference signal of an adjacent region reported by UE. On the basis of the above embodiment, the apparatus further includes:
and the processing unit is used for enhancing the transmitting power of the RE interfered by the adjacent cell downlink common reference signal at intervals of a specified number of radio frames in the process of repeatedly sending the PDSCH according to a first specified proportion, and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the RE interfered by the adjacent cell downlink common reference signal is located according to a second specified proportion.
In order to take the measurement functions of the neighboring cell edge user such as RSRP (Reference Signal Receiving Power), RSRQ (Reference Signal Receiving Quality) and the like into consideration, the embodiment of the present invention performs the Power enhancement once at a certain radio frame interval in the process of repeatedly transmitting the PDSCH, so that the rest of the repeatedly transmitted radio frames are transmitted according to the original design, i.e., the Power enhancement is not performed.
On the basis of the above embodiment, the apparatus further includes:
and the second receiving unit is used for receiving the position index numbers of the REs where the downlink common reference signals of the neighboring cells reported by the terminal are located, and each downlink common reference signal position corresponds to one number.
On the basis of the above embodiment, the apparatus further includes:
and the indicating unit is used for increasing a neighboring cell interference power coordination indicating domain in downlink scheduling information (DCI) or Radio Resource Control (RRC) signaling, wherein the power coordination indicating domain is used for indicating the proportion that a terminal needs to perform power enhancement at a data RE position interfered by a neighboring cell downlink common reference signal and the proportion that power reduction needs to be performed at a residual data RE position of the OFDM symbol downlink service channel.
Specifically, the base station issues the power-up ratio of the RE of the pilot sequence frequency domain position of the neighboring cell that needs to perform interference power coordination to the terminal through the following two ways:
1. the real-time requirement on the no-load interference coordination of the adjacent cells is higher, and dynamic interference coordination is adopted, namely, an adjacent cell interference power coordination indication domain is added in DCI of a scheduling downlink.
For example: each neighboring cell downlink common reference signal position number uses 2 bits to indicate whether the complex-valued symbol RE on the RE mapped by the neighboring cell downlink common reference signal corresponding to the position number of the UE needs to perform power enhancement, and the enhancement ratio, for example, the neighboring cell interference power coordination indication field in DCI is 4 bits, each position number is represented by applying 2 bits, and the neighboring cell interference power coordination indication field is shown in table 1. The bit number of the specific adjacent cell interference power coordination indication domain is equal to the product of the power enhancement coefficient index bit number corresponding to each position number and the position number. The number of the position numbers and the index bit number of the power enhancement coefficient corresponding to each position number can be determined according to conditions such as cell planning and simulation and the like and by combining the detection complexity of the PDCCH.
2. When the requirement on the idle load interference coordination real-time performance of the adjacent cell is not high, semi-static interference coordination can be adopted, and the adjacent cell interference power coordination indication domain is added in the RRC signaling.
Specifically, the neighboring cell interference power coordination indication field is added to the RRC signaling, which is similar to table 1, and the bit number of the neighboring cell interference power coordination indication field is equal to the product of the power enhancement coefficient index bit number corresponding to each position number and the position number. The number of the position numbers and the index bit number of the power enhancement coefficient corresponding to each position number can be determined according to conditions such as cell planning, simulation and the like. An embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the method shown in fig. 1 is implemented.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
As shown in fig. 5, the electronic device provided by the embodiment of the present invention includes a memory 21, a processor 22, a bus 23, and a computer program stored on the memory 21 and executable on the processor 22. The memory 21 and the processor 22 complete communication with each other through the bus 23.
The processor 22 is used for calling the program instructions in the memory 21 to implement the method of fig. 1 when executing the program.
For example, the processor implements the following method when executing the program:
receiving a neighbor cell no-load identifier reported by a terminal, an SINR on an RE where a downlink common reference signal of the cell is located, and an SINR on the RE where the downlink common reference signal of the neighbor cell is located, wherein the neighbor cell no-load identifier is used for indicating whether the neighbor cell is in no-load;
when the no-load identification of the adjacent cell indicates that the adjacent cell is no-load, when downlink service data are sent to a terminal, according to the SINR on the RE where the downlink common reference signal of the cell is located and the SINR on the RE where the downlink common reference signal of the adjacent cell is located, the transmitting power of the data RE interfered by the downlink common reference signal of the adjacent cell is enhanced according to a first specified proportion; and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion.
The electronic equipment provided by the embodiment of the invention realizes the power coordination of the adjacent cell interference under the idle load condition of the edge terminal of the cell by enhancing the transmitting power of the RE interfered by the specific reference signal of the downlink cell of the adjacent cell and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel of the interfered RE under the idle load condition of the adjacent cell, so that the demodulation performance of the terminal under the condition is improved, and the transmission rate of the downlink data of the terminal is ensured.
Embodiments of the present invention also provide a non-transitory computer readable storage medium, on which a computer program is stored, and the program, when executed by a processor, implements the steps of fig. 1.
For example, the processor implements the following method when executing the program:
receiving a neighbor cell no-load identifier reported by a terminal, an SINR on an RE where a downlink common reference signal of the cell is located, and an SINR on the RE where the downlink common reference signal of the neighbor cell is located, wherein the neighbor cell no-load identifier is used for indicating whether the neighbor cell is in no-load;
when the no-load identification of the adjacent cell indicates that the adjacent cell is no-load, when downlink service data are sent to a terminal, according to the SINR on the RE where the downlink common reference signal of the cell is located and the SINR on the RE where the downlink common reference signal of the adjacent cell is located, the transmitting power of the data RE interfered by the downlink common reference signal of the adjacent cell is enhanced according to a first specified proportion; and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion.
In the non-transitory computer-readable storage medium provided in the embodiment of the present invention, under the no-load condition of the neighboring cell, if the no-load condition of the neighboring cell is satisfied, power coordination of interference to the neighboring cell by a cell edge terminal under the no-load condition of the neighboring cell is implemented by enhancing the transmit power of REs interfered by a specific reference signal of a downlink cell of the neighboring cell and reducing the transmit power of remaining data REs of an OFDM symbol downlink traffic channel where the interfered REs are located, so as to improve the demodulation performance of the terminal under the condition and ensure the transmission rate of downlink data of the terminal.
An embodiment of the present invention discloses a computer program product, the computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to perform the method provided by the above method embodiments, for example, including:
receiving a neighbor cell no-load identifier reported by a terminal, an SINR on an RE where a downlink common reference signal of the cell is located, and an SINR on the RE where the downlink common reference signal of the neighbor cell is located, wherein the neighbor cell no-load identifier is used for indicating whether the neighbor cell is in no-load;
when the no-load identification of the adjacent cell indicates that the adjacent cell is no-load, when downlink service data are sent to a terminal, according to the SINR on the RE where the downlink common reference signal of the cell is located and the SINR on the RE where the downlink common reference signal of the adjacent cell is located, the transmitting power of the data RE interfered by the downlink common reference signal of the adjacent cell is enhanced according to a first specified proportion; and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and of course, can also be implemented by hardware. With this understanding in mind, the above technical solutions may be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the method according to the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A downlink traffic channel interference coordination method, comprising:
receiving a neighbor cell no-load identifier reported by a terminal, an SINR on an RE where a downlink common reference signal of the cell is located, and an SINR on the RE where the downlink common reference signal of the neighbor cell is located, wherein the neighbor cell no-load identifier is used for indicating whether the neighbor cell is in no-load;
when the no-load identification of the adjacent cell indicates that the adjacent cell is no-load, when downlink service data are sent to a terminal, the transmitting power of the data RE interfered by the downlink common reference signal of the adjacent cell is enhanced according to a first specified proportion according to the SINR on the RE where the downlink common reference signal of the cell is located and the SINR on the RE where the downlink common reference signal of the adjacent cell is located; and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion.
2. The method of claim 1, wherein the first specified ratio and the second specified ratio are related as follows:
when the RE mapped by the cell downlink common reference signal in the OFDM symbol where the RE interfered by the neighbor cell downlink common reference signal is located has N1Number of one, position number miThe RE mapped by the corresponding adjacent cell downlink common reference signal has Ni+1Wherein m isiThe position number of the downlink common reference signal of the adjacent cell reported by the UE is numbered, if the position number m is numberediAfter the power of the complex-valued symbol on the RE mapped by the corresponding adjacent cell downlink common reference signal is enhanced, the amplitude of the complex-valued symbol is changed into the original Ai+1After the power of the complex value symbol on the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the neighboring cell is located is reduced, the amplitude of the complex value symbol is changed into the original A1And D, if the power of the downlink common reference signal in the cell is kept unchanged, A1The calculation formula of (a) is as follows:
Figure FDA0001931049630000011
wherein, M is the number of subcarriers scheduled by a user downlink shared channel, ρ is the offset between the receiving power and the data power of the cell reference signal, and n is the number of position numbers of the downlink common reference signal of the neighboring cell reported by the UE.
3. The method of claim 1, further comprising:
and in the process of repeatedly sending the PDSCH, enhancing the transmitting power of the RE interfered by the downlink common reference signal of the adjacent cell at intervals of a specified number of radio frames according to a first specified proportion, and reducing the transmitting power of the rest data RE of the OFDM symbol downlink service channel where the RE interfered by the downlink common reference signal of the adjacent cell is located according to a second specified proportion.
4. The method of claim 1, further comprising:
and receiving the position index number of the RE where the downlink common reference signal of the adjacent cell reported by the terminal is located, wherein the position of each downlink common reference signal corresponds to one number.
5. The method of claim 4, further comprising:
and adding a neighboring cell interference power coordination indication domain in downlink scheduling DCI or RRC signaling, wherein the power coordination indication domain is used for indicating the proportion that a terminal needs to perform power enhancement at the position of data RE interfered by a neighboring cell downlink common reference signal and the proportion that the power needs to be reduced at the position of the rest data RE of the OFDM symbol downlink service channel.
6. An apparatus for downlink traffic channel interference coordination, the apparatus comprising:
a first receiving unit, configured to receive a no-load identifier of a neighboring cell, an SINR on an RE where a downlink common reference signal of a current cell is located, and an SINR on the RE where the downlink common reference signal of the neighboring cell is located, where the no-load identifier of the neighboring cell is used to indicate whether the neighboring cell is no-load;
a coordination unit, configured to, when the idle-load identifier of the neighboring cell indicates that the neighboring cell is idle, when downlink service data is sent to the terminal, enhance, according to the SINR on the RE where the downlink common reference signal of the current cell is located and the SINR on the RE where the downlink common reference signal of the neighboring cell is located, the transmit power of the data RE interfered by the downlink common reference signal of the neighboring cell according to a first specified proportion; and reducing the transmitting power of the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent region is located according to a second specified proportion.
7. The apparatus of claim 6, wherein the first specified ratio and the second specified ratio are related as follows:
when the receiving neighbor isThe RE mapped by the downlink common reference signal of the cell in the OFDM symbol where the RE interfered by the downlink common reference signal has N1Number of one, position number miThe RE mapped by the corresponding adjacent cell downlink common reference signal has Ni+1Wherein m isiThe position number of the downlink common reference signal of the adjacent cell reported by the UE is numbered, if the position number m is numberediAfter the power of the complex-valued symbol on the RE mapped by the corresponding adjacent cell downlink common reference signal is enhanced, the amplitude of the complex-valued symbol is changed into the original Ai+1After the power of the complex value symbol on the residual data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the neighboring cell is located is reduced, the amplitude of the complex value symbol is changed into the original A1And D, if the power of the downlink common reference signal in the cell is kept unchanged, A1The calculation formula of (a) is as follows:
Figure FDA0001931049630000031
wherein, M is the number of subcarriers scheduled by a user downlink shared channel, ρ is the offset between the receiving power and the data power of the cell reference signal, and n is the number of position numbers of the downlink common reference signal of the neighboring cell reported by the UE.
8. The apparatus of claim 6, further comprising:
and the processing unit is used for enhancing the transmitting power of the RE interfered by the adjacent cell downlink common reference signal at intervals of a specified number of radio frames in the process of repeatedly sending the PDSCH according to a first specified proportion, and reducing the complex value symbol power on the residual data RE of the OFDM symbol downlink service channel where the RE interfered by the adjacent cell downlink common reference signal is located according to a second specified proportion.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the downlink traffic channel interference coordination method according to any one of claims 1 to 5 when executing the program.
10. A non-transitory computer-readable storage medium, having stored thereon a computer program, wherein the computer program, when being executed by a processor, implements the steps of the downlink traffic channel interference coordination method according to any one of claims 1 to 5.
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CN104185286A (en) * 2014-08-14 2014-12-03 京信通信***（中国）有限公司 Method and system for downlink interference coordination of long term evolution (LTE) system and LTE base station
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