CN111385861B - Method and device for coordinating downlink traffic channel interference - Google Patents
Method and device for coordinating downlink traffic channel interference Download PDFInfo
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- CN111385861B CN111385861B CN201811640634.8A CN201811640634A CN111385861B CN 111385861 B CN111385861 B CN 111385861B CN 201811640634 A CN201811640634 A CN 201811640634A CN 111385861 B CN111385861 B CN 111385861B
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- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
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- 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
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- 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
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- H04W52/325—Power control of control or pilot channels
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- 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
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Abstract
The embodiment of the invention provides a downlink traffic channel interference coordination method and device, wherein the method comprises the following steps: receiving an idle load identifier of a neighboring cell, an SINR (signal to interference plus noise ratio) of an RE where a downlink public reference signal of a cell is located and an SINR of the RE where the downlink public reference signal of the neighboring cell is located, wherein the idle load identifier of the neighboring cell is used for indicating whether the neighboring cell is idle; when the neighbor idle load identification indicates that the neighbor is idle, enhancing the transmitting power of the data RE interfered by the neighbor downlink public reference signal according to a first appointed proportion when transmitting downlink service data 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 cell is located according to a second designated proportion. The embodiment of the invention can realize the power coordination of the interference to the adjacent cell under the idle condition of the adjacent cell of the cell edge terminal under the idle 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
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 provides a high-speed data transmission service to users as a 4G mainstream technology. In some application scenarios based on the LTE technology, for example, data acquisition of a smart grid of a power system, due to scarcity of frequency resources, a same-frequency networking mode is adopted, so that precious frequency resources can be saved, and system capacity is 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, the positions of RE (Resource Element) of downlink common reference signal (cell specific reference signal) Resource mapping of adjacent cells are staggered, that is, the downlink common reference signals of the adjacent cells are time-division or frequency-division so as to avoid mutual interference between the downlink common reference signals, but the interference of the downlink common reference signals of the adjacent cells on downlink service data symbols of the cells cannot be avoided.
When the neighbor cell is idle (i.e. the neighbor cell only transmits the downlink cell public reference signal and no downlink service data is transmitted), because there is no data signal transmitted by the neighbor cell on the RE mapped by the downlink cell public 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 condition of the downlink cell public reference signal of the neighbor cell on the data signal of the cell cannot be reflected. However, the downlink service data of the present cell may be degraded due to the interference performance of the common reference signal of the neighboring cell, especially when the cell edge user receives the downlink common reference signal power sent by the neighboring cell eNB (base station) and is greater than or equal to the downlink service data power sent by the present cell eNB, the signal receiving quality on the interfered data RE may be degraded, which may seriously affect the downlink service data of the present cell, especially the high-order modulation receiving performance such as high MCS or 16QAM, 64QAM, etc.
Typically, for cell edge users, because of coverage problems, the eNB can select larger repetition times to improve the performance when carrying out service data scheduling. However, when the co-channel 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 radio frame, although the service data of the neighboring cell is repeatedly sent in a plurality of radio frames, the receiving end still cannot combine and receive the service data to improve the signal receiving quality of the interfered data RE of the neighboring cell, so that the demodulation performance of the whole downlink service data is seriously affected, and the transmission rate of the downlink service data is reduced, and particularly, the performance is greatly reduced when the high-order modulation such as high MCS, 16QAM, 64QAM and the like is performed.
Disclosure of Invention
Aiming at the technical problems in the prior art, the embodiment of the invention provides a downlink service channel interference coordination method and device.
In a first aspect, an embodiment of the present invention provides a downlink traffic channel interference coordination method, where the method includes:
receiving an idle load identifier of a neighboring cell, an SINR (signal to interference plus noise ratio) of an RE where a downlink public reference signal of a cell is located and an SINR of the RE where the downlink public reference signal of the neighboring cell is located, wherein the idle load identifier of the neighboring cell is used for indicating whether the neighboring cell is idle;
when the neighbor idle load identification indicates neighbor idle load, when downlink service data is sent to a terminal, according to the SINR of the RE where the downlink public reference signal of the cell is located and the SINR of the RE where the downlink public reference signal of the neighbor is located, the transmitting power of the data RE interfered by the downlink public reference signal of the neighbor is enhanced according to a first appointed 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 cell is located according to a second designated proportion.
Optionally, when the 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 of the neighboring cell is located has N 1 Position number m i Corresponding toRE of adjacent cell downlink public reference signal mapping has N i+1 And m is i For the position number of the adjacent cell downlink public reference signal reported by the UE, if the position number m is i After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A i+1 The complex value symbol amplitude becomes the original A after the complex value symbol power 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 adjacent cell is located is reduced 1 The power of the downlink common reference signal of the cell is kept unchanged, A 1 The calculation formula of (2) is as follows:
wherein M is the number of subcarriers scheduled by the user downlink shared channel, ρ is the offset of the received power and the data power of the cell reference signal, and n is the number of the position numbers of the adjacent cell downlink common reference signal reported by the UE.
In a second aspect, an embodiment of the present invention provides a downlink traffic channel interference coordination device, where the device includes:
the first receiving unit is used for receiving an idle load identifier of a neighboring cell, an SINR (signal to interference plus noise ratio) on an RE where a downlink public reference signal of the cell is located and an SINR on the RE where the downlink public reference signal of the neighboring cell is located, which are reported by the terminal, wherein the idle load identifier of the neighboring cell is used for indicating whether the neighboring cell is idle or not;
the coordination unit is used for enhancing the transmitting power of the data RE interfered by the downlink public reference signal of the adjacent cell according to the SINR of the RE where the downlink public reference signal of the cell is located and the SINR of the RE where the downlink public 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 downlink service data is transmitted 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 cell is located according to a second designated proportion.
Alternatively, the process may be carried out in a single-stage,when the 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 of the neighboring cell is located has N 1 Position number m i RE mapped by corresponding adjacent cell downlink public reference signal has N i+1 And m is i For the position number of the adjacent cell downlink public reference signal reported by the UE, if the position number m is i After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A i+1 The complex value symbol amplitude becomes the original A after the complex value symbol power 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 adjacent cell is located is reduced 1 The power of the downlink common reference signal of the cell is kept unchanged, A 1 The calculation formula of (2) is as follows:
wherein M is the number of subcarriers scheduled by the user downlink shared channel, ρ is the offset of the received power and the data power of the cell reference signal, and n is the number of the position numbers of the adjacent cell downlink common reference signal reported by the UE.
In a third aspect, an embodiment of the invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method as provided in the first aspect when the program is executed.
In a fourth aspect, embodiments of the present invention provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method as provided by the first aspect.
In the embodiment of the invention, under the idle condition of the neighbor cell, when the power coordination of the neighbor cell interference is realized under the idle condition of the neighbor cell of the cell edge terminal by enhancing the transmitting power of the RE interfered by the downlink public reference signal of the neighbor cell and reducing the transmitting power of the rest data RE of the OFDM symbol downlink service channel where the interfered RE is positioned, the demodulation performance of the terminal under the condition is improved, and the downlink data transmission rate of the terminal is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart illustrating a power coordination method for interference to a neighboring cell in a situation that the neighboring cell of an edge terminal of a downlink traffic channel cell is idle according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a downlink traffic channel repeatedly transmitted in a plurality of radio frames;
fig. 3 is a schematic diagram of a power coordination method for interference to a neighboring cell in a situation that the neighboring cell of an edge terminal of a downlink traffic channel cell is idle in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power coordination device for interference to a neighboring cell under an idle condition of the neighboring cell of an edge terminal of a downlink traffic channel cell 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
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The role of the LTE system downlink common reference signal (cell specific reference signal) is channel estimation by inserting pilot signals at different time and frequency ends, herein referred to as downlink pilot signals for channel estimation and related demodulation of all downlink transmission technologies except for the non-codebook based beamforming technology, in particular, pseudo random sequences generated using gold sequences may be used as downlink pilot signals. Cell-specific means that this reference signal corresponds to the number of antenna ports (antenna ports 0-3) between one cell base station. Downlink control or traffic data is transmitted on the first 13 OFDM (Orthogonal Frequency Division Multiplexing, i.e., orthogonal frequency division multiplexing) symbols of each radio frame, and the RE locations of the downlink pilot signal map are only correlated with the cell ID.
Fig. 1 is a flow chart illustrating a downlink traffic channel interference coordination method according to an embodiment of the present invention.
As shown in fig. 1, the method comprises the following steps:
s11, receiving an idle load identifier of a neighboring cell, an SINR (signal to interference plus noise ratio) on an RE where a downlink public reference signal of the cell is located and an SINR on an RE where the downlink public reference signal of the neighboring cell is located, wherein the idle load identifier of the neighboring cell is used for indicating whether the neighboring cell is idle;
specifically, when the neighbor cell is idle, the neighbor cell only transmits a cell-specific reference signal, and no downlink service data is transmitted.
The embodiment of the invention judges the idle load condition of the adjacent cell through the terminal and reports the idle load condition to the base station by carrying the idle load identifier of the adjacent cell. The method for judging the idle load of the neighbor cell by the terminal is described in detail in an 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 at the position of the cell reference signal of the adjacent cell except the interference power of the adjacent cell is larger 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 are not described in detail.
S12, when the neighbor idle load identification indicates neighbor idle load, when downlink service data is sent to a terminal, according to the SINR on the RE where the downlink public reference signal of the cell is located and the SINR on the RE where the downlink public reference signal of the neighbor is located, the transmitting power of the data RE interfered by the downlink public reference signal of the neighbor is enhanced according to a first appointed 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 cell is located according to a second designated proportion.
Specifically, for the physical downlink shared channel, one transport block may be mapped to multiple radio frames for transmission, and for supporting deep coverage, multiple repeated transmissions may be performed on one transport block. For cell edge users, interference of the downlink common reference signal of the neighboring cell on downlink service data symbols of the cell can greatly affect transmission performance of the downlink service data of the cell, especially 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 radio frame, although the service data of the cell is repeatedly sent in a plurality of radio frames, signal receiving quality on interfered data RE of the cell can not be improved through combining and receiving of a receiving end, and thus demodulation performance of the whole downlink service data is seriously affected.
When the cell base station transmits downlink service data to the terminal, the receiving quality of the cell downlink service data on the RE interfered by the neighbor cell downlink common reference signal is close to that of other undisturbed data RE by properly increasing the transmitting power of the RE interfered by the neighbor cell downlink specific reference signal; and correspondingly reduces the transmitting power of the rest data REs of the uplink and downlink traffic channels of the OFDM symbols where the interfered REs are positioned, 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 of the downlink common reference signal of the cell on the RE and the SINR of the downlink common reference signal of the neighbor cell on the RE.
In the embodiment of the invention, under the idle condition of the neighbor cell, the neighbor cell interference power coordination under the idle condition of the neighbor cell of the cell edge terminal is realized by enhancing the transmission power of the downlink public reference signal interference REs of the neighbor cell and reducing the transmission power of the rest data REs of the downlink service channels on the OFDM symbols where the interfered REs are positioned, so that the terminal demodulation performance under the idle condition is improved, and the downlink data transmission rate 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 the OFDM symbol where the RE interfered by the adjacent cell downlink public reference signal is located has N 1 RE of the downlink common reference signal mapping of the own cell is N 2 Number of positions m 1 RE mapped by corresponding neighbor downlink common reference signal and N 3 Number of positions m 2 RE … … mapped by corresponding neighbor downlink common reference signals and N n+1 Number of positions m n And the corresponding RE mapped by the neighbor downlink common reference signal.
Wherein m is 1 、m 2 ……m n And numbering the position of the downlink public reference signal of the adjacent cell reported by the UE.
If the pair of position numbers m 1 After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A 2 Doubling, para-position numbering m 2 After the RE complex value symbol power mapped by the corresponding neighbor downlink common reference signal is enhanced, the complex value symbol amplitude becomes the original A 3 Multiple … …, pair position number m n After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A n+1 The complex value symbol amplitude becomes the original A after the complex value symbol power 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 adjacent cell is located is reduced 1 Multiple times, then A 1 The calculation formula of (2) is as follows:
wherein M is the number of subcarriers scheduled by the user downlink shared channel, ρ is the related parameter obtained by downlink power allocation defined in 3GPP 36.213 protocol, namely the offset of the received power and the data power of the cell reference signal, and n is the number of the position numbers of the adjacent cell downlink common reference signal reported by the UE.
The embodiment of the invention is power the specific method for adjusting comprises the following steps: let N be the own cell in a certain OFDM symbol 1 Reference signals RE, relative position number m 1 After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A 2 Doubling, para-position numbering m 2 After the RE complex value symbol power mapped by the corresponding neighbor downlink common reference signal is enhanced, the complex value symbol amplitude becomes the original A 3 Multiple … …, pair position number m n After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A n+1 Multiple of (A) 2 ……A n+1 All are equal to or greater than 1), then the complex value symbol amplitude becomes the original A after the complex value symbol power on the residual data RE of the uplink and downlink traffic channels of the OFDM symbol is reduced 1 Multiple times, then A 1 The calculation is carried out according to the following formula:
wherein M is the number of subcarriers scheduled by a physical downlink shared channel (PDSCH, physical Downlink Shared Channel), ρ is a related parameter obtained by downlink power allocation defined in 3gpp 36.213 protocol, that is, an offset of the received power and the data power of the cell reference signal, and n is the number of position numbers of the neighboring cell downlink common reference signal reported by the UE.
On the basis of the above embodiment, the method further includes:
and enhancing the transmission power of the RE interfered by the downlink public reference signal of the adjacent cell according to a first designated proportion by spacing a designated number of radio frames in the repeated transmission process of the PDSCH, and reducing the transmission power of the residual data RE of the downlink service channel of the OFDM symbol where the RE interfered by the downlink public reference signal of the adjacent cell is positioned according to a second designated proportion.
Fig. 2 shows a schematic diagram of a downlink traffic channel repeatedly transmitted in a plurality of radio frames.
For repeated transmissions in the same PUSCH schedule, PUSCH transmissions
The transmission Of the M_PUSCH_Number_of_cycle is divided into M_PUSCH_Number_of_cycle,
As shown in fig. 2: i SF =2, each TB block rate matched to the uplink subframe of 4 radio frames,
the PUSCH for transmitting this TB block is transmitted 8 times in total, according to the formula +.>
That is, the bit sequence matched in each Cycle starts to take bits according to the starting point corresponding to redundancy version 0 in LTE, takes out bits according to the number of bits transmitted in the uplink subframe in the first radio frame, transmits 4 times, takes out bits according to the number of bits transmitted in the uplink subframe in the next radio frame, and transmits 4 times, so that the next Cycle starts after the 4 radio frame length bits are transmitted sequentially.
In order to take account of the measurement functions of RSRP (Reference Signal Receiving Power, reference signal received power), RSRQ (Reference Signal Receiving Quality, reference signal received quality) and the like of cell edge users, the embodiment of the present invention performs the above power enhancement once according to a specified number of radio frames at intervals of a certain period in the PDSCH repeated transmission process, so that the remaining repeated radio frames are transmitted according to the original design, that is, no power enhancement is performed. In this way, the neighbor cell edge user can respectively measure RSRP, RSRQ and the like on the received signals which are not subjected to power enhancement.
Fig. 3 shows a power coordination method for interference to a neighboring cell in a idle condition of the neighboring cell of an edge terminal of a downlink traffic channel cell according to an embodiment of the present invention.
As shown in fig. 3, power boosting is performed once every 4 radio frames. The rest repeatedly transmitted radio frames are transmitted according to the original transmitting power, so that the terminal can measure RSRP, RSRQ and the like on 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 numbers of REs where the downlink common reference signals of the adjacent cells are reported by the terminal, wherein each downlink common reference signal position corresponds to one number.
Specifically, the content reported by the terminal further includes the position index number of the RE where the downlink public reference signal of the neighboring cell is located, and each downlink public reference signal position corresponds to one number, so that the base station knows the position of the data RE which is interfered by the downlink public reference signal of the neighboring cell and the position of the residual data RE of the downlink service channel of the OFDM symbol.
On the basis of the above embodiment, the method further includes:
and adding a neighboring cell interference power coordination indication domain in the DCI of the scheduling downlink or in the RRC signaling, wherein the power coordination indication domain is used for indicating the proportion of the terminal needing power enhancement at the position of the data RE interfered by the neighboring cell downlink common reference signal, so that the proportion of the terminal needing power reduction 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 transmits the proportion of power enhancement to the RE position of the downlink common reference signal of the adjacent cell, which needs to perform interference power coordination, to the terminal in the following two modes:
1. the real-time performance requirement on neighbor idle interference coordination is high, and dynamic interference coordination is adopted, namely, a neighbor interference power coordination indication domain is added in the DCI of the scheduling downlink.
For example: each position number of the neighboring cell downlink common reference signal 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 pair is expressed by applying 2 bits, and the neighboring cell interference power coordination indication field is shown in table 1:
TABLE 1
The bit number of the interference power coordination indication field of the specific adjacent cell is equal to the product of the index bit number of the power enhancement coefficient corresponding to each position number and the position number. The number of the position numbers and the number of the index bits of the power enhancement coefficient corresponding to each position number can be determined according to the conditions of cell planning, simulation and the like and by combining with the complexity of PDCCH detection.
2. When the real-time requirement on the idle interference coordination of the neighbor cell is not high, semi-static interference coordination can be adopted, and the neighbor cell interference power coordination indication domain is added in RRC signaling.
Specifically, adding the above-mentioned neighbor cell interference power coordination indication field to RRC signaling is similar to table 1, and the number of bits of the neighbor cell interference power coordination indication field is equal to the product of the number of power enhancement coefficient index bits corresponding to each position number and the number of position numbers. The number of position numbers and the number of power enhancement coefficient index bits corresponding to each position number can be determined according to the conditions of cell planning, simulation and the like.
Fig. 4 shows a schematic structural diagram of a downlink traffic channel interference coordination device according to an embodiment of the present invention.
As shown in fig. 4, the apparatus comprises a first receiving unit 11 and a coordination unit 12, wherein:
the first receiving unit 11 is configured to receive a neighbor idle load identifier reported by a terminal, an SINR on an RE where a downlink common reference signal of a cell is located, and an SINR on an RE where a downlink common reference signal of the neighbor is located, where the neighbor idle load identifier is used to indicate whether the neighbor is idle;
the coordination unit 12 is configured to, when the neighbor idle load identifier indicates that the neighbor is idle, enhance, according to a first specified proportion, transmission power of a data RE interfered by a neighbor downlink common reference signal according to SINR on an RE where a downlink common reference signal of the neighbor is located and SINR on an RE where the neighbor downlink common reference signal is located when downlink service data is sent to a 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 cell is located according to a second designated proportion.
In the embodiment of the invention, under the idle condition of the neighbor cell, the neighbor cell interference power coordination under the idle condition of the neighbor cell of the cell edge terminal is realized by enhancing the transmission power of the downlink public reference signal interference REs of the neighbor cell and reducing the transmission power of the downlink service channel residual data REs on the OFDM symbols where the interfered REs are positioned, so that the terminal demodulation performance under the idle condition is improved, and the downlink data transmission rate 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 the OFDM symbol where the RE interfered by the adjacent cell downlink public reference signal is located has N 1 RE of the downlink common reference signal mapping of the own cell is N 2 Number of positions m 1 RE mapped by corresponding neighbor downlink common reference signal and N 3 Number of positions m 2 RE … … mapped by corresponding neighbor downlink common reference signals and N n+1 Number of positions m n And the corresponding RE mapped by the neighbor downlink common reference signal.
Wherein m is 1 、m 2 ……m n And numbering the position of the downlink public reference signal of the adjacent cell reported by the UE.
If the position is knittedNumber m 1 After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A 2 Doubling, para-position numbering m 2 After the RE complex value symbol power mapped by the corresponding neighbor downlink common reference signal is enhanced, the complex value symbol amplitude becomes the original A 3 Multiple … …, pair position number m n After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A n+1 The complex value symbol amplitude becomes the original A after the complex value symbol power 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 adjacent cell is located is reduced 1 Multiple times, then A 1 The calculation formula of (2) is as follows:
wherein M is the number of subcarriers scheduled by the user downlink shared channel, and n is the number of the position numbers of the adjacent cell downlink public reference signals reported by the UE.
The specific method for adjusting the power of the embodiment of the invention comprises the following steps: let N be the own cell in a certain OFDM symbol 1 Reference signals RE, relative position number m 1 After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A 2 Doubling, para-position numbering m 2 After the RE complex value symbol power mapped by the corresponding neighbor downlink common reference signal is enhanced, the complex value symbol amplitude becomes the original A 3 Multiple … …, pair position number m n After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A n+1 Multiple of (A) 2 ……A n+1 All are equal to or greater than 1), then the complex value symbol amplitude becomes the original A after the complex value symbol power on the residual data RE of the uplink and downlink traffic channels of the OFDM symbol is reduced 1 Multiple times, then A 1 The calculation is carried out according to the following formula:
thereby get +.>
Wherein M is the number of subcarriers scheduled by a user PUSCH (physical uplink shared channel), and n is the number of position numbers of the downlink common reference signals of the neighboring cells reported by the UE. On the basis of the above embodiment, the apparatus further includes:
and the processing unit is used for enhancing the transmission power of the RE interfered by the downlink common reference signal of the adjacent cell according to a first designated proportion in the process of repeatedly sending the PDSCH by a designated number of radio frames, and reducing the transmission power of the residual data RE of the downlink service channel of the OFDM symbol where the RE interfered by the downlink common reference signal of the adjacent cell is positioned according to a second designated proportion.
In order to take account of the measurement functions of RSRP (Reference Signal Receiving Power, reference signal received power), RSRQ (Reference Signal Receiving Quality, reference signal received quality) and the like of the neighboring cell edge users, the embodiment of the present invention performs the above power enhancement once with a certain radio frame interval in the PDSCH repeated transmission process, so that the remaining repeated radio frames are transmitted according to the original design, i.e. no power enhancement is 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 RE where the downlink public reference signals of the adjacent cells are located, which are reported by the terminal, wherein each downlink public reference signal position corresponds to one number.
On the basis of the above embodiment, the apparatus further includes:
and the indication unit is used for adding a neighboring cell interference power coordination indication domain in the DCI of the scheduling downlink or in the RRC signaling, wherein the power coordination indication domain is used for indicating the proportion of the terminal needing power enhancement at the position of the data RE interfered by the neighboring cell downlink common reference signal and the proportion of the terminal needing power reduction at the position of the residual data RE of the OFDM symbol downlink service channel.
Specifically, the base station transmits the proportion of power lifting to the RE of the pilot sequence frequency domain position of the adjacent cell needing interference power coordination to the terminal in the following two modes:
1. the real-time performance requirement on neighbor idle interference coordination is high, and dynamic interference coordination is adopted, namely, a neighbor interference power coordination indication domain is added in the DCI of the scheduling downlink.
For example: each position number of the neighboring cell downlink common reference signal 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 the DCI is 4 bits, each position number pair is expressed by applying 2 bits, and the neighboring cell interference power coordination indication field is shown in table 1. The bit number of the interference power coordination indication field of the specific adjacent cell is equal to the product of the index bit number of the power enhancement coefficient corresponding to each position number and the position number. The number of the position numbers and the number of the index bits of the power enhancement coefficient corresponding to each position number can be determined according to the conditions of cell planning, simulation and the like and by combining with the complexity of PDCCH detection.
2. When the real-time requirement on the idle interference coordination of the neighbor cell is not high, semi-static interference coordination can be adopted, and the neighbor cell interference power coordination indication domain is added in RRC signaling.
Specifically, adding the above-mentioned neighbor cell interference power coordination indication field to RRC signaling is similar to table 1, and the number of bits of the neighbor cell interference power coordination indication field is equal to the product of the number of power enhancement coefficient index bits corresponding to each position number and the number of position numbers. The number of position numbers and the number of power enhancement coefficient index bits corresponding to each position number can be determined according to the conditions of cell planning, simulation and the like. The embodiment of the invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method as shown in fig. 1 when executing the program.
Fig. 5 shows 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. Wherein the memory 21 and the processor 22 communicate with each other via the bus 23.
The processor 22 is arranged to invoke program instructions in the memory 21 for implementing the method as in fig. 1 when executing the program.
For example, the processor, when executing the program, implements the following method:
receiving an idle load identifier of a neighboring cell, an SINR (signal to interference plus noise ratio) of an RE where a downlink public reference signal of a cell is located and an SINR of the RE where the downlink public reference signal of the neighboring cell is located, wherein the idle load identifier of the neighboring cell is used for indicating whether the neighboring cell is idle;
when the neighbor idle load identification indicates neighbor idle load, when downlink service data is sent to a terminal, according to the SINR of the cell downlink public reference signal on the RE and the SINR of the neighbor downlink public reference signal on the RE, the transmitting power of the data RE interfered by the neighbor downlink public reference signal is enhanced according to a first appointed 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 cell is located according to a second designated proportion.
According to the electronic equipment provided by the embodiment of the invention, under the idle condition of the neighbor cell, the power coordination of interference to the neighbor cell under the idle condition of the neighbor cell of the cell edge terminal is realized by enhancing the transmitting power of the RE interfered by the specific reference signal of the downlink cell of the neighbor cell and reducing the transmitting power of the residual data RE of the downlink traffic channel of the OFDM symbol where the interfered RE is positioned, so that the terminal demodulation performance under the condition is improved, and the downlink data transmission rate of the terminal is ensured.
Embodiments of the present invention also provide a non-transitory computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of fig. 1.
For example, the processor, when executing the program, implements the following method:
receiving an idle load identifier of a neighboring cell, an SINR (signal to interference plus noise ratio) of an RE where a downlink public reference signal of a cell is located and an SINR of the RE where the downlink public reference signal of the neighboring cell is located, wherein the idle load identifier of the neighboring cell is used for indicating whether the neighboring cell is idle;
when the neighbor idle load identification indicates neighbor idle load, when downlink service data is sent to a terminal, according to the SINR of the RE where the downlink public reference signal of the cell is located and the SINR of the RE where the downlink public reference signal of the neighbor is located, the transmitting power of the data RE interfered by the downlink public reference signal of the neighbor is enhanced according to a first appointed 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 cell is located according to a second designated proportion.
The non-transitory computer readable storage medium provided by the embodiment of the invention realizes the power coordination of interference to the adjacent cell under the idle condition of the adjacent cell of the cell edge terminal by enhancing the transmitting power of RE interfered by the specific reference signal of the downlink cell of the adjacent cell and reducing the transmitting power of the rest data RE of the OFDM symbol downlink service channel where the interfered RE is positioned under the idle 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.
An embodiment of the present invention discloses a 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, are capable of performing the methods provided by the above-described method embodiments, for example comprising:
receiving an idle load identifier of a neighboring cell, an SINR (signal to interference plus noise ratio) of an RE where a downlink public reference signal of a cell is located and an SINR of the RE where the downlink public reference signal of the neighboring cell is located, wherein the idle load identifier of the neighboring cell is used for indicating whether the neighboring cell is idle;
when the neighbor idle load identification indicates neighbor idle load, when downlink service data is sent to a terminal, according to the SINR of the RE where the downlink public reference signal of the cell is located and the SINR of the RE where the downlink public reference signal of the neighbor is located, the transmitting power of the data RE interfered by the downlink public reference signal of the neighbor is enhanced according to a first appointed 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 cell is located according to a second designated proportion.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for downlink traffic channel interference coordination, the method comprising:
receiving an idle load identifier of a neighboring cell, an SINR (signal to interference plus noise ratio) of an RE where a downlink public reference signal of a cell is located and an SINR of the RE where the downlink public reference signal of the neighboring cell is located, wherein the idle load identifier of the neighboring cell is used for indicating whether the neighboring cell is idle;
when the neighbor idle load identification indicates neighbor idle load, when downlink service data is sent to a terminal, according to the SINR of the RE where the downlink public reference signal of the cell is located and the SINR of the RE where the downlink public reference signal of the neighbor is located, the transmitting power of the data RE interfered by the downlink public reference signal of the neighbor is enhanced according to a first appointed 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 cell is located according to a second designated proportion.
2. The method of claim 1, wherein the relationship between the first specified ratio and the second specified ratio is as follows:
the REs mapped by the downlink common reference signals of the cell in the OFDM symbol where the data REs interfered by the downlink common reference signals of the adjacent cells are located have N 1 Position number m i RE mapped by corresponding adjacent cell downlink public reference signal has N i+1 And m is i For the position number of the adjacent cell downlink public reference signal reported by the UE, if the position number m is i After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A i+1 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 cell is positioned is reduced according to a second designated proportion, and then the amplitude of the complex value symbol is changed into the original A 1 Multiple, smallThe power of the district downlink public reference signal remains unchanged, A 1 The calculation formula of (2) is as follows:
wherein M is the number of subcarriers scheduled by the user downlink shared channel, ρ is the offset of the received power and the data power of the cell reference signal, and n is the number of the position numbers of the adjacent cell downlink common reference signal reported by the UE.
3. The method according to claim 1, wherein the method further comprises:
and enhancing the transmitting power of the data RE interfered by the downlink common reference signal of the adjacent cell according to a first designated proportion by spacing a designated number of radio frames in the repeated transmission process of the PDSCH, and reducing the transmitting power of the rest data RE of the OFDM symbol downlink service channel where the data RE interfered by the downlink common reference signal of the adjacent cell is positioned according to a second designated proportion.
4. The method according to claim 1, wherein the method further comprises:
and receiving the position index numbers of REs where the downlink common reference signals of the adjacent cells are reported by the terminal, wherein each downlink common reference signal position corresponds to one number.
5. The method according to claim 4, wherein the method further comprises:
and adding a neighboring cell interference power coordination indication domain in the DCI of the scheduling downlink or in the RRC signaling, wherein the power coordination indication domain is used for indicating the proportion of the terminal needing power enhancement at the position of the data RE interfered by the neighboring cell downlink common reference signal and the proportion of the terminal needing power reduction at the position of the residual data RE of the OFDM symbol downlink service channel.
6. A downlink traffic channel interference coordination apparatus, the apparatus comprising:
the first receiving unit is used for receiving an idle load identifier of a neighboring cell, an SINR (signal to interference plus noise ratio) on an RE where a downlink public reference signal of the cell is located and an SINR on the RE where the downlink public reference signal of the neighboring cell is located, which are reported by the terminal, wherein the idle load identifier of the neighboring cell is used for indicating whether the neighboring cell is idle or not;
the coordination unit is used for enhancing the transmitting power of the data RE interfered by the downlink public reference signal of the adjacent cell according to the SINR of the RE where the downlink public reference signal of the cell is located and the SINR of the RE where the downlink public 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 downlink service data is transmitted 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 cell is located according to a second designated proportion.
7. The apparatus of claim 6, wherein the relationship between the first specified ratio and the second specified ratio is as follows:
the REs mapped by the downlink common reference signals of the cell in the OFDM symbol where the data REs interfered by the downlink common reference signals of the adjacent cells are located have N 1 Position number m i RE mapped by corresponding adjacent cell downlink public reference signal has N i+1 And m is i For the position number of the adjacent cell downlink public reference signal reported by the UE, if the position number m is i After the complex value symbol power on RE mapped by the corresponding neighbor downlink public reference signal is enhanced, the complex value symbol amplitude becomes the original A i+1 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 cell is positioned is reduced according to a second designated proportion, and then the amplitude of the complex value symbol is changed into the original A 1 The power of the downlink common reference signal of the cell is kept unchanged, A 1 The calculation formula of (2) is as follows:
wherein M is the number of subcarriers scheduled by the user downlink shared channel, ρ is the offset of the received power and the data power of the cell reference signal, and n is the number of the position numbers of the adjacent cell downlink common reference signal reported by the UE.
8. The apparatus of claim 6, wherein the apparatus further comprises:
and the processing 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 designated proportion in the process of repeatedly transmitting the PDSCH by a designated number of radio frames, and reducing the complex-valued symbol power 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 adjacent cell is positioned according to a second designated proportion.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the downlink traffic channel interference coordination method of any of claims 1 to 5 when the program is executed.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the downlink traffic channel interference coordination method according to any of claims 1 to 5.
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