CN102036393A - Method and equipment for determining multi-cell channel information - Google Patents
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Abstract
The embodiment of the invention discloses a method and equipment for determining multi-cell channel information. Multi-cell channel quality information fed back by a terminal, channel state information between each cell and the terminal and interference information of each cell to the resource information distributed by the terminal are utilized in a base station, and then user scheduling, interference coordination and modulation and coding mode selection are performed so as to improve the throughput and processing efficiency of multi-cell combined processing.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a device for determining multi-cell channel information.
Background
In an LTE-Advanced (Long Term Evolution Advanced) system of 3GPP, a CoMP (Co-coordinated Multi-Point Transmission) technology is adopted to improve the service quality of cell edge users.
The multi-point cooperative transmission technology improves the quality of signals received by users and reduces the interference among cells through the joint scheduling or cooperative transmission of a plurality of cells separated in geographical positions, thereby effectively improving the system capacity and the frequency spectrum efficiency of edge users.
The technical scheme of the multipoint cooperative transmission is mainly divided into two types: joint scheduling and joint transmission.
Joint scheduling is to allocate mutually orthogonal resources to different UEs (User equipments) by coordinating time, frequency and space resources among cells, so as to avoid mutual interference. The inter-cell interference is a main factor restricting the performance of the cell edge UE, so that the inter-cell interference can be reduced by the joint scheduling, and the performance of the cell edge UE is improved.
As shown in fig. 1, which is a schematic diagram of an application scenario of a joint scheduling technique in the prior art, three UEs that may interfere with each other are scheduled on mutually orthogonal resources through joint scheduling of three cells, so that interference between the cells is effectively avoided.
Different from a joint scheduling scheme in which only one cell transmits data to the UE, a plurality of cells transmit data to the UE at the same time in the joint transmission scheme, so as to enhance the UE reception signal.
As shown in fig. 2, which is a schematic diagram of an application scenario of a joint transmission technique in the prior art, three cells transmit data to one UE on the same resource, and the UE receives signals of multiple cells simultaneously.
In an aspect, superposition of useful signals from multiple cells may improve the signal quality received by the UE. On the other hand, the interference suffered by the UE is reduced, thereby improving the system performance.
In the LTE system, the UE estimates channel information from the base station to the UE according to a common pilot port of a serving cell, calculates Channel Quality Indicator (CQI) and feeds the CQI back to the base station, and may also include a Precoding Matrix Index (PMI) and a data stream number (RI) which are fed back together with the CQI.
The CQI feedback enables the base station to perform operations such as scheduling, resource allocation, MCS selection and the like, and improves the utilization rate of the frequency spectrum.
The LTE-A system further enhances the sending of channel information for supporting the multi-point cooperative transmission. And the UE estimates the channel information from each cell to the UE according to the common pilot frequency sent by the cells in the Measurement cell Set (Measurement Set). Then, the UE directly feeds back the channel information to the base station after scalar quantization or vector quantization. And the base station performs operations such as precoding matrix calculation, multi-user pairing, MCS selection and the like according to the channel information fed back by the UE.
For a TDD system, a base station may obtain uplink channel information according to an SRS signal transmitted by a UE, and obtain downlink channel information by using reciprocity of an uplink channel and a downlink channel.
In implementing the embodiments of the present invention, the applicant finds that the prior art has at least the following problems:
in actual operation, the interference on the uplink and the downlink is generally different, and the base station cannot accurately predict the interference on the UE, and moreover, due to the adoption of schemes such as joint scheduling, the interference level of the coordinated cells changes, and the UE cannot predict the change of the interference level when performing channel information feedback.
For the above reasons, the base station cannot accurately select MCS and perform frequency domain scheduling for the UE only according to the channel information fed back by the UE or the channel information obtained by SRS.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for determining multi-cell channel information, which enable a base station to determine a signal interference noise ratio by using multi-cell channel quality information fed back by a terminal and resource information allocated to the terminal by each cell, and perform user scheduling, resource allocation and MCS selection according to the signal interference noise ratio.
In order to achieve the above object, an aspect of the present invention provides a method for determining multi-cell channel information, which is applied in a mobile communication system supporting cooperative transmission of multiple cells, where one cell of the multiple cells is a serving cell of a terminal, other cells are cooperative cells of the terminal, and a base station corresponding to each cell provides a cooperative transmission service for the terminal, and the method includes:
the base station of the serving cell receives Channel Quality Indicator (CQI) information of each cell sent by the terminal;
the base station of the service cell acquires the channel state information of each cell to the terminal;
the base station of the service cell acquires interference information of the resource scheduled by the cooperative cell to the terminal scheduled by the service cell;
and the base station of the serving cell determines the signal to interference noise ratio (SINR) according to the CQI information of each cell, the channel state information of each cell to the terminal and the interference information of the cooperative cell scheduling to the resource of the terminal scheduled by the serving cell, which are obtained by the base station of the serving cell.
On the other hand, an embodiment of the present invention further provides a base station, which is applied to a mobile communication system supporting cooperative transmission of multiple cells, where one cell of the multiple cells is a serving cell of a terminal, other cells are cooperative cells of the terminal, a base station corresponding to each cell provides cooperative transmission service for the terminal, and the base station corresponds to the serving cell, and includes:
a receiving module, configured to receive CQI information of each cell sent by the terminal;
an obtaining module, configured to obtain channel state information of each cell to the terminal, and interference information of scheduling of the cooperative cell to resources of the serving cell for scheduling the terminal;
a determining module, configured to determine a signal to interference noise ratio SINR according to the CQI information of each cell, the channel state information of each cell to the terminal, and interference information of the resource scheduled by the cooperative cell to the terminal scheduled by the serving cell, acquired by the base station of the serving cell;
and the processing module is used for determining a mode of sending downlink data to the terminal according to the SINR determined by the determining module.
On the other hand, an embodiment of the present invention further provides a terminal, which is applied to a mobile communication system supporting cooperative transmission of multiple cells, where one cell of the multiple cells is a serving cell of the terminal, and other cells are cooperative cells of the terminal, and a base station corresponding to each cell provides a cooperative transmission service for the terminal, and the method includes:
a receiving module, configured to receive CRS and/or CSI-RS sent by the base station corresponding to each cell;
a calculating module, configured to calculate CQI information corresponding to each cell according to the CRS and/or CSI-RS sent by each base station and received by the receiving module;
a sending module, configured to send the CQI information generated by the calculating module to a base station of the serving cell.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, the base station determines the signal interference noise ratio by utilizing the multi-cell channel quality information fed back by the terminal and the resource information distributed by each cell for the terminal, and carries out user scheduling, resource distribution and MCS selection according to the signal interference noise ratio, thereby improving the throughput and the processing efficiency of multi-cell combined processing.
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FIG. 1 is a diagram illustrating an application scenario of a joint scheduling technique in the prior art;
FIG. 2 is a diagram illustrating an application scenario of a joint transmission technique in the prior art;
fig. 3 is a flowchart illustrating a method for determining multi-cell channel information according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a method for determining multi-cell channel information in a specific application scenario according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
As described in the background art, in the existing technical solutions, the base station cannot accurately select the MCS for the UE and perform frequency domain scheduling only according to the channel information fed back by the UE or the channel information obtained by the SRS.
In view of the above problem, the base station may determine the signal to interference plus noise ratio by using the multi-cell channel quality information fed back by the terminal and the resource information allocated to the terminal by each cell, and perform user scheduling, resource allocation and MCS selection accordingly.
Based on the above technical idea, an embodiment of the present invention provides a method for determining multi-cell channel information, which is applied to a mobile communication system including multiple cells, where one cell of the multiple cells is a serving cell of a terminal, other cells are cooperative cells of the terminal, and a base station corresponding to each cell provides a joint scheduling service for the terminal.
As shown in fig. 3, a schematic flow chart of a method for determining multi-cell channel information according to an embodiment of the present invention includes the following steps:
step S301, the base station serving the cell receives CQI information indicating channel quality of each cell transmitted by the terminal.
Before the base station serving the cell receives the CQI information of each cell transmitted by the terminal, the following processing flow is further included:
(1) and the base station corresponding to each cell respectively transmits CRS and/or CSI-RS.
(2) The terminal calculates the CQI information corresponding to each cell according to the received CRS and/or CSI-RS sent by each base station, and the specific calculation formula is as follows:
wherein,
the received power of the signal of each cell is received for the terminal,
N0in order to receive the noise of the terminal,
I0as are other interference factors outside each cell.
In a specific application scenario, the terminal receives the average received power of the signals of each cell
Specifically, the calculation is performed in the following two ways:
the first method is as follows:
wherein Hi，kIs the channel matrix of the ith cooperative cell to the terminal on the kth subcarrier within the measurement bandwidth.
The second method comprises the following steps:
wherein Hi，kIs the channel matrix, H, of the ith cooperative cell to the terminal on the kth subcarrier within the measurement bandwidthi，k(m, n) are channel coefficients of the nth transmit antenna to the mth receive antenna.
It should be noted that the calculation range of the average received power in the above two ways may be the whole bandwidth or a predetermined band.
(3) The terminal transmits CQI information of each cell to the base station of the serving cell.
Step S302, the base station of the service cell acquires the channel state information of each cell to the terminal.
The method for acquiring the channel information of the terminal by the base station of the serving cell specifically includes the following two ways:
in the first mode, the base station of the serving cell receives downlink channel state information between the base station and the terminal corresponding to each cell, which is sent by the terminal.
And secondly, the base station of each cell receives the SRS signal sent by the terminal, acquires uplink channel state information between the terminal and the base station corresponding to each cell according to the SRS signal, and acquires downlink channel state information between the base station corresponding to each cell and the terminal according to channel reciprocity.
Before the base station of the serving cell acquires the channel state information of each cell to the terminal, the method further includes:
when the channel state information of each cell to the terminal, which is acquired by the base station of the serving cell, is calculated by the terminal according to the received CRS and/or CSI-RS sent by each base station, the terminal normalizes the downlink channel state information between the base station and the terminal corresponding to each cell according to the following formula:
wherein Hi，kThe ith cooperation small is obtained by the terminal according to CRS and/or CSI-RS estimationA channel matrix of a zone to the terminal on a k-th subcarrier within a measurement bandwidth,
or,
when the base station of each cell determines the downlink channel state information between the base station and the terminal corresponding to each cell according to the received SRS signal sent by the terminal, the base station corresponding to each cell normalizes the downlink channel state information between the base station and the terminal corresponding to each cell according to the following formula:
wherein Hi，kIs a channel matrix to the terminal on the kth subcarrier in the measurement bandwidth obtained by the ith cooperative cell according to the SRS signal sent by the terminal,
for the average received power of the base station of each cell, the specific algorithm and the received power of the terminal for receiving the signal of each cell
The calculation is the same, and the description is not repeated here.
Step S303, the base station of the service cell acquires the interference information of the resource of the scheduling terminal of the service cell by the scheduling of the cooperative cell.
Namely, the base station of the serving cell obtains the precoding information used by the resource which is scheduled by the cooperative cell and is the same as the resource of the terminal scheduled by the serving cell.
Step S304, the base station of the service cell acquires the interference information of the resource of the scheduling terminal of the service cell by the cooperative cell scheduling according to the CQI information of each cell, the channel state information of each cell to the terminal and the base station of the service cell, and determines the SINR.
In a specific application scenario, the specific calculation method is to calculate through the following formula:
wherein,
is the downlink normalized channel state information between the base station and the terminal corresponding to each cell,
w1is the precoding matrix information used by the downlink determined by the base station corresponding to the serving cell,
wiis the precoding information used by the same resource scheduled by the cooperating cell as the resource of the serving cell scheduling terminal,
CQI1the CQI information corresponding to the serving cell,
CQIiand CQI information corresponding to the cooperative cell.
It should be particularly noted that the above formulas are only preferred examples selected for the purpose of technical solution description in the embodiments of the present invention, and formulas and parameters that can achieve the same technical effects based on the technical idea of the present invention also belong to the protection scope of the present invention.
Step S305, the base station of the serving cell determines a mode of transmitting downlink data to the terminal according to the SINR.
In a specific application scenario, the specific implementation content of this step is that the base station of the serving cell determines, according to the SINR, a modulation and coding scheme MCS and frequency domain resources for transmitting downlink data to the terminal.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, the base station determines the signal interference noise ratio by utilizing the multi-cell channel quality information fed back by the terminal and the resource information distributed by each cell for the terminal, and carries out user scheduling, resource distribution and MCS selection according to the signal interference noise ratio, thereby improving the throughput and the processing efficiency of multi-cell combined processing.
The technical solution proposed in the embodiment of the present invention is described below with reference to specific application scenarios.
As shown in fig. 4, a schematic flow chart of a method for determining multi-cell channel information in a specific application scenario proposed in the embodiment of the present invention specifically includes the following steps:
step S401, a plurality of cell base stations in the cooperative cell set send CRS or/and CSI-RS.
Step S402, the UE measures the ratio of the receiving power of a plurality of cells to the noise interference, namely CQI information, respectively based on the reference signals sent by the base stations of the plurality of cells.
Taking 2 cells as an example, the content indicated by the CQI information is as follows:
CQI information of serving cell: <math><mrow><msub><mi>CQI</mi><mn>1</mn></msub><mo>=</mo><mfrac><mover><msub><mi>P</mi><mn>1</mn></msub><mo>‾</mo></mover><mrow><msub><mi>N</mi><mn>0</mn></msub><mo>+</mo><msub><mi>I</mi><mn>0</mn></msub></mrow></mfrac><mo>;</mo></mrow></math>
CQI information of the cooperative cell: <math><mrow><msub><mi>CQI</mi><mn>2</mn></msub><mo>=</mo><mfrac><mover><msub><mi>P</mi><mn>2</mn></msub><mo>‾</mo></mover><mrow><msub><mi>N</mi><mn>0</mn></msub><mo>+</mo><msub><mi>I</mi><mn>0</mn></msub></mrow></mfrac><mo>.</mo></mrow></math>
wherein,
p represents the transmission power of each cell base station, PL is the path loss from each cell base station to the UE terminal, N0For received noise at the UE side, I0Other interference factors outside the set of cooperating cells.
In a specific implementation project, the UE measures an average received power of each cooperative cell (including a serving cell) according to a received reference symbol:
wherein Hi，kThe channel matrix from the ith cooperative cell to the UE on the kth subcarrier in the measurement bandwidth is obtained, that is, the average received power is calculated based on the overall channel state information.
The average received power may also be calculated as follows:
wherein Hi，kIs the channel matrix of the ith cooperating cell to the UE on the kth subcarrier within the measurement bandwidth,
Hi，k(m, n) are channel coefficients from the nth transmitting antenna to the mth receiving antenna, i.e., average received power information is calculated with reference to channels of a certain pair of transmitting and receiving antennas.
The values of m and n are predetermined, such as fixed as (1, 1) or agreed by the base station and the UE.
The calculation range of the average received power may be the entire bandwidth or a predetermined band.
Step S403, the UE terminal sends the measured CQI information of the plurality of cells to the base station of the serving cell.
Step S404, the serving cell base station and the cooperative cell base station obtain the channel state information H between the UE terminal and the serving cell base station.
In a specific application scenario, the method for obtaining the channel state information H includes the following two methods, and the specific process is described as follows:
according to the first method, a UE terminal sends SRS signals (Sounding Reference Signal), the sent SRS signals are received by a plurality of cell base stations, the base station end of the plurality of cells measures the SRS signals to obtain uplink channel state information of the UE terminal, and downlink channel state information Hi is obtained according to channel reciprocity. Take two cells as an example: i.e. serving cell H1Of the cooperative cell H2。
And secondly, the UE terminal measures CSI-CS (channel state information reference symbols) sent by the multi-cell base station and Hi matrixes of all cells, and performs quantization compression processing on Hi or directly feeds the Hi matrixes of the cells back to the serving cell.
In addition, in the two methods, the Hi matrix information measured by the base station or the UE needs to be power normalized before further processing, and a specific power normalization method is as follows:
the method for calculating the average received power in the denominator should be consistent with the method for calculating the average power by the UE in step S402, and for the two calculation methods, the obtained power normalization matrix may have different specific values due to different factors such as the receiver gain, the channel condition, the measurement reference symbol, etc. of the UE and the base station, but the calculation method for the power normalization is the same.
Step S405, a plurality of cell base stations in the coordinated cell set perform information interaction, so that the serving cell obtains precoding information wi of UE scheduled by the coordinated cell, or directly obtains interference information.
If SRS is used to measure the multi-cell channel state information Hi in each cell, the normalized channel state information measured by the base station of the interactive cooperation cell is also needed
Step S406, the base station normalizes the channel state information of the cooperative cell according to the CQI information of the cooperative cell
And precoding matrix information wi of the cooperative cell, and calculating to obtain the SINR.
For example, <math><mrow><mi>SINR</mi><mo>=</mo><mfrac><mrow><msub><mover><mi>P</mi><mo>‾</mo></mover><mn>1</mn></msub><mo>×</mo><msup><mrow><mo>|</mo><mo>|</mo><msub><mover><mi>H</mi><mo>‾</mo></mover><mrow><mn>1</mn><mo>,</mo><mi>k</mi></mrow></msub><msub><mi>w</mi><mn>1</mn></msub><mo>|</mo><mo>|</mo></mrow><mn>2</mn></msup></mrow><mrow><munderover><mi>Σ</mi><mrow><mi>i</mi><mo>=</mo><mn>2</mn></mrow><mi>N</mi></munderover><msub><mover><mi>P</mi><mo>‾</mo></mover><mi>i</mi></msub><mo>×</mo><msup><mrow><mo>|</mo><mo>|</mo><msub><mover><mi>H</mi><mo>‾</mo></mover><mrow><mi>i</mi><mo>,</mo><mi>k</mi></mrow></msub><msub><mi>w</mi><mi>i</mi></msub><mo>|</mo><mo>|</mo></mrow><mn>2</mn></msup><mo>+</mo><msub><mi>I</mi><mn>0</mn></msub><mo>+</mo><msub><mi>N</mi><mn>0</mn></msub></mrow></mfrac><mo>=</mo><mfrac><mrow><msub><mi>CQI</mi><mn>1</mn></msub><mo>×</mo><msup><mrow><mo>|</mo><mo>|</mo><msub><mover><mi>H</mi><mo>‾</mo></mover><mrow><mn>1</mn><mo>,</mo><mi>k</mi></mrow></msub><msub><mi>w</mi><mn>1</mn></msub><mo>|</mo><mo>|</mo></mrow><mn>2</mn></msup></mrow><mrow><mn>1</mn><mo>+</mo><munderover><mi>Σ</mi><mrow><mi>i</mi><mo>=</mo><mn>2</mn></mrow><mi>N</mi></munderover><msub><mi>CQI</mi><mi>i</mi></msub><mo>×</mo><msup><mrow><mo>|</mo><mo>|</mo><msub><mover><mi>H</mi><mo>‾</mo></mover><mrow><mi>i</mi><mo>,</mo><mi>k</mi></mrow></msub><msub><mi>w</mi><mi>i</mi></msub><mo>|</mo><mo>|</mo></mrow><mn>2</mn></msup></mrow></mfrac></mrow></math>
wherein,
is the downlink normalized channel state information between the base station corresponding to each cell and the terminal,
w1is the precoding matrix information used by the downlink determined by the base station corresponding to the serving cell,
wiis precoding information used by the same resource scheduled by the cooperating cell as the resource scheduled by the serving cell for the terminal,
CQI1the CQI information corresponding to the serving cell,
CQIiand CQI information corresponding to the cooperative cell.
It should be noted that the above algorithm is only a preferred embodiment of the present invention for convenience of description, and in practice, more complex algorithms may be used, and the variation of specific algorithm rules does not affect the protection scope of the present invention.
Step S407, the base station determines the modulation and coding scheme MCS and the frequency domain resource used by the downlink transmission data according to the SINR.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, the base station determines the signal interference noise ratio by utilizing the multi-cell channel quality information fed back by the terminal and the resource information distributed by each cell for the terminal, and carries out user scheduling, resource distribution and MCS selection according to the signal interference noise ratio, thereby improving the throughput and the processing efficiency of multi-cell combined processing.
In order to implement the technical solution of the embodiment of the present invention, an embodiment of the present invention further provides a base station, which is applied to a mobile communication system supporting cooperative transmission of multiple cells, where one cell of the multiple cells is a serving cell of a terminal, other cells are cooperative cells of the terminal, a base station corresponding to each cell provides a cooperative transmission service for the terminal, and the base station corresponds to the serving cell.
As shown in fig. 5, a schematic structural diagram of a base station provided in an embodiment of the present invention specifically includes:
a receiving module 51, configured to receive CQI information of each cell sent by the terminal.
An obtaining module 52, configured to obtain channel state information of each cell to a terminal, and interference information of scheduling of a cooperative cell to resources of a serving cell scheduling terminal.
In a specific application scenario, the obtaining module 52 obtains channel information of the terminal, specifically:
the obtaining module 52 receives downlink channel state information between the base station and the terminal corresponding to each cell sent by the terminal; or,
the obtaining module 52 receives an SRS signal sent by a terminal, obtains uplink channel state information between the terminal and a base station corresponding to each cell according to the SRS signal, and obtains downlink channel state information between the base station corresponding to each cell and the terminal according to channel reciprocity.
Before the obtaining module 52 obtains the channel information of each cell to the terminal from the base station of the serving cell, the method further includes:
when the channel state information of each cell to the terminal acquired by the acquiring module 52 is calculated by the terminal according to the received CRS and/or CSI-RS sent by each base station, the terminal normalizes the downlink channel state information between the base station and the terminal corresponding to each cell according to the following formula:
wherein Hi，kIs a channel matrix from the terminal to the terminal on the kth subcarrier in the measurement bandwidth of the ith cooperative cell estimated by the terminal according to the CRS and/or the CSI-RS,
the average receiving power used by the terminal when calculating the CQI;
or,
when the obtaining module 52 determines the downlink channel state information between the base station and the terminal corresponding to each cell according to the received SRS signal sent by the terminal, the obtaining module normalizes the downlink channel state information between the base station and the terminal corresponding to each cell according to the following formula:
wherein Hi，kIs a channel matrix to the terminal on the kth subcarrier in the measurement bandwidth obtained by the ith cooperative cell according to the SRS signal sent by the terminal,
And the determining module 53 is configured to determine an SINR according to the CQI information of each cell, the channel state information of each cell to the terminal, and interference information of the resource of the serving cell scheduling terminal obtained by the base station of the serving cell by the cooperative cell scheduling.
And the processing module 54 is configured to determine, according to the SINR determined by the determining module 53, a manner of sending downlink data to the terminal.
In a specific application scenario, the specific processing procedure is as follows:
the processing module 54 determines the modulation and coding scheme MCS and frequency domain resources for transmitting downlink data to the terminal according to the SINR.
On the other hand, the embodiment of the present invention further provides a terminal, which is applied to a mobile communication system supporting cooperative transmission of multiple cells, where one cell of the multiple cells is a serving cell of the terminal, other cells are cooperative cells of the terminal, and a base station corresponding to each cell provides a cooperative transmission service for the terminal.
As shown in fig. 6, a schematic structural diagram of a terminal according to an embodiment of the present invention specifically includes:
a receiving module 61, configured to receive CRS and/or CSI-RS sent by a base station corresponding to each cell;
a calculating module 62, configured to calculate CQI information corresponding to each cell according to the CRS and/or CSI-RS sent by each base station and received by the receiving module 61;
in a specific application scenario, the calculation module calculates CQI information corresponding to each cell according to the received CRS and/or CSI-RS sent by each base station, specifically by using the following formula:
wherein,
the received power of the signal of each cell is received for the terminal,
N0in order to receive the noise of the terminal,
I0as are other interference factors outside each cell.
A sending module 63, configured to send the CQI information generated by the calculating module to a base station of a serving cell.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, the base station determines the signal interference noise ratio by utilizing the multi-cell channel quality information fed back by the terminal and the resource information distributed by each cell for the terminal, and carries out user scheduling, resource distribution and MCS selection according to the signal interference noise ratio, thereby improving the throughput and the processing efficiency of multi-cell combined processing.
Through the above description of the embodiments, it is clear to those skilled in the art that the embodiments of the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the embodiment of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the various implementation scenarios of the embodiment of the present invention.
Those skilled in the art will appreciate that the figures are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the figures are not necessarily required to implement embodiments of the present invention.
Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The sequence numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the implementation scenarios.
The above disclosure is only a few specific implementation scenarios of the embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations that can be considered by those skilled in the art should fall within the scope of the business limitations of the embodiments of the present invention.
Claims (14)
1. A method for determining multi-cell channel information is applied to a mobile communication system supporting multi-cell cooperative transmission, wherein one cell of the multiple cells is a serving cell of a terminal, other cells are cooperative cells of the terminal, and a base station corresponding to each cell provides a cooperative transmission service for the terminal, and the method is characterized by comprising the following steps:
the base station of the serving cell receives Channel Quality Indicator (CQI) information of each cell sent by the terminal;
the base station of the service cell acquires the channel state information of each cell to the terminal;
the base station of the service cell acquires interference information of the resource scheduled by the cooperative cell to the terminal scheduled by the service cell;
and the base station of the serving cell determines the signal to interference noise ratio (SINR) according to the CQI information of each cell, the channel state information of each cell to the terminal and the interference information of the cooperative cell scheduling to the resource of the terminal scheduled by the serving cell, which are obtained by the base station of the serving cell.
2. The method of claim 1, wherein before the base station of the serving cell receives the CQI information of each cell sent by the terminal, the method further comprises:
the base station corresponding to each cell respectively sends a common reference signal CRS and/or a channel state information reference signal CSI-RS;
the terminal calculates CQI information corresponding to each cell according to the received CRS and/or CSI-RS sent by each base station;
and the terminal sends the CQI information of each cell to the base station of the serving cell.
3. The method of claim 2, wherein the terminal calculates CQI information corresponding to each cell according to the received CRS and/or CSI-RS transmitted by each base station, and specifically calculates the CQI information according to the following formula:
wherein,
receiving station for the terminalThe average received power of the signal of each cell,
N0for the purpose of the reception noise of the terminal,
I0and the interference factors are other interference factors outside the cells.
4. The method according to claim 1, wherein the obtaining, by the base station of the serving cell, the channel state information of the terminal by each cell specifically includes:
the base station of the service cell receives downlink channel state information between the base station corresponding to each cell and the terminal, which is sent by the terminal; or,
and the base station of each cell receives the SRS signal sent by the terminal, acquires uplink channel state information between the terminal and the base station corresponding to each cell according to the SRS signal, and acquires downlink channel state information between the base station corresponding to each cell and the terminal according to channel reciprocity.
5. The method as claimed in claim 4, wherein before the base station of the serving cell acquires the channel state information of the terminal from each cell, the method further comprises:
when the channel state information of each cell to the terminal, which is acquired by the base station of the serving cell, is calculated by the terminal according to the received CRS and/or CSI-RS sent by each base station, the terminal normalizes the downlink channel state information between the base station corresponding to each cell and the terminal according to the following formula:
wherein Hi，kIs a channel matrix from the terminal to the terminal on the kth subcarrier in the measurement bandwidth of the ith cooperative cell estimated by the terminal according to the CRS and/or the CSI-RS,
or,
when the base station of each cell determines the downlink channel state information between the base station corresponding to each cell and the terminal according to the received SRS signal sent by the terminal, the base station corresponding to each cell normalizes the downlink channel state information between the base station corresponding to each cell and the terminal according to the following formula:
wherein Hi，kIs a channel matrix to the terminal on the kth subcarrier in the measurement bandwidth obtained by the ith cooperative cell according to the SRS signal sent by the terminal,
6. The method of claim 3 or 5,
the average received power of the terminal for receiving the signal of each cell or the average received power of the base station of each cell is specifically calculated by the following formula:
wherein Hi，kIs the channel matrix of the ith cooperative cell to the terminal on the kth subcarrier in the measurement bandwidth; or,
the average received power of the terminal for receiving the signal of each cell or the average received power of the base station of each cell is specifically calculated by the following formula:
wherein Hi，kIs the channel matrix, H, of the ith cooperative cell to the terminal on the kth subcarrier within the measurement bandwidthi，k(m, n) are channel coefficients of the nth transmit antenna to the mth receive antenna.
The calculation range of the average received power of the terminal for receiving the signal of each cell or the average received power of the base station of each cell may be the whole bandwidth or a predetermined band.
7. The method of claim 1, wherein the obtaining, by the base station of the serving cell, the interference information of the resource of the terminal scheduled by the serving cell from the scheduling of the cooperative cell specifically includes:
and the base station of the serving cell obtains precoding information used by the resource which is scheduled by the cooperative cell and is the same as the resource of the terminal scheduled by the serving cell.
8. The method of claim 1, further comprising:
and the base station of the serving cell determines a mode for sending downlink data to the terminal according to the SINR, wherein the mode of the downlink data comprises a Modulation Coding Scheme (MCS) and frequency domain resources.
9. A base station, applied to a mobile communication system supporting cooperative transmission of multiple cells, where one cell of the multiple cells is a serving cell of a terminal, and other cells are cooperative cells of the terminal, and a base station corresponding to each cell provides a cooperative transmission service for the terminal, where the base station corresponds to the serving cell, and the base station includes:
a receiving module, configured to receive CQI information of each cell sent by the terminal;
an obtaining module, configured to obtain channel state information of each cell to the terminal, and interference information of scheduling of the cooperative cell to resources of the serving cell for scheduling the terminal;
a determining module, configured to determine a signal to interference noise ratio SINR according to the CQI information of each cell, the channel state information of each cell to the terminal, and interference information of the resource scheduled by the cooperative cell to the terminal scheduled by the serving cell, acquired by the base station of the serving cell;
and the processing module is used for determining a mode of sending downlink data to the terminal according to the SINR determined by the determining module.
10. The base station of claim 9, wherein the obtaining module obtains the channel information of the terminal, specifically:
the acquisition module receives downlink channel state information between the base station corresponding to each cell and the terminal, which is sent by the terminal; or,
the acquisition module receives an SRS signal sent by the terminal, acquires uplink channel state information between the terminal and a base station corresponding to each cell according to the SRS signal, and acquires downlink channel state information between the base station corresponding to each cell and the terminal according to channel reciprocity.
11. The base station of claim 10, wherein before the obtaining module obtains the channel state information of the cells to the terminal, the method further comprises:
when the channel state information of the terminal obtained by the obtaining module for each cell is calculated by the terminal according to the received CRS and/or CSI-RS sent by each base station, the terminal normalizes the downlink channel state information between the base station corresponding to each cell and the terminal according to the following formula:
wherein Hi，kIs a channel matrix from the terminal to the terminal on the kth subcarrier in the measurement bandwidth of the ith cooperative cell estimated by the terminal according to the CRS and/or the CSI-RS,
the average receiving power used by the terminal when calculating the CQI;
or,
when the obtaining module determines the downlink channel state information between the base station corresponding to each cell and the terminal according to the received SRS signal sent by the terminal, the obtaining module normalizes the downlink channel state information between the base station corresponding to each cell and the terminal according to the following formula:
wherein Hi，kIs a channel matrix to the terminal on the kth subcarrier in the measurement bandwidth obtained by the ith cooperative cell according to the SRS signal sent by the terminal,
is the average received power of the base station of each cell.
12. The base station of claim 9, wherein the processing module determines a manner of sending downlink data to the terminal, specifically, according to the SINR
And the processing module determines a Modulation and Coding Scheme (MCS) and frequency domain resources for sending downlink data to the terminal according to the SINR.
13. A terminal, applied to a mobile communication system supporting cooperative transmission of multiple cells, where one cell of the multiple cells is a serving cell of the terminal, and other cells are cooperative cells of the terminal, and a base station corresponding to each cell provides a cooperative transmission service for the terminal, the terminal comprising:
a receiving module, configured to receive CRS and/or CSI-RS sent by the base station corresponding to each cell;
a calculating module, configured to calculate CQI information corresponding to each cell according to the CRS and/or CSI-RS sent by each base station and received by the receiving module;
a sending module, configured to send the CQI information generated by the calculating module to a base station of the serving cell.
14. The terminal of claim 13, wherein the calculating module calculates CQI information corresponding to each cell according to the received CRS and/or CSI-RS sent by each base station, and specifically calculates the CQI information according to the following formula:
wherein,
receiving the received power of the signal of each cell for the terminal,
N0for the purpose of the reception noise of the terminal,
I0and the interference factors are other interference factors outside the cells.
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| WO2017166919A1 (en) * | 2016-03-29 | 2017-10-05 | 华为技术有限公司 | Sounding reference signal resource allocation method and apparatus |
| CN109526001A (en) * | 2017-09-19 | 2019-03-26 | 中国移动通信有限公司研究院 | A kind of measurement method, base station, terminal and communication equipment |
| CN109802734B (en) * | 2017-11-17 | 2020-10-23 | 华为技术有限公司 | Method and device for transmitting channel quality information |
| CN109802734A (en) * | 2017-11-17 | 2019-05-24 | 华为技术有限公司 | A kind of method and apparatus of transmission of channel quality information |
| WO2020108637A1 (en) * | 2018-11-30 | 2020-06-04 | 华为技术有限公司 | Channel sounding configuration method and apparatus |
| CN111262667A (en) * | 2018-11-30 | 2020-06-09 | 华为技术有限公司 | Channel detection configuration method and device |
| CN111262667B (en) * | 2018-11-30 | 2022-04-05 | 华为技术有限公司 | Channel detection configuration method and device |
| CN112203284A (en) * | 2020-09-07 | 2021-01-08 | 北京遥感设备研究所 | Terminal position self-adaptive multi-cell joint resource allocation method, device and system |
| CN112203284B (en) * | 2020-09-07 | 2023-10-17 | 北京遥感设备研究所 | Multi-cell joint resource allocation method, device and system with self-adaptive terminal position |
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