Data transmission method and deviceTechnical FieldThe present invention relates to the field of communications, and in particular, to a data transmission method and apparatus.
BackgroundIn a wireless communication system, before a base station transmits downlink data to User Equipment (UE), the base station determines Resource Blocks (RBs), RANK (RANK) values and Modulation and Coding Schemes (MCS) to be used for transmitting the downlink data according to received Channel State Information (CSI) fed back by the User Equipment, and calculates Transport Blocks (TB) to be used for transmitting the downlink data according to the MCS and the RBs allocated by the base station. The channel state information may be channel state information received by a current Transmission Time Interval (TTI) of the base station or a filtered value of a plurality of pieces of channel state information received within a plurality of TTIs.
However, no matter the base station receives the CSI periodically or aperiodically, there is a time delay between the measurement time when the ue measures the CSI, the reception time when the base station receives the CSI, and the transmission time when the base station transmits downlink data, for example, as shown in fig. 1, time T is the measurement time when the ue measures the CSI, time T + N is the reception time when the base station receives the CSI, time T + N is the transmission time when the base station transmits downlink data, where N is the time delay when the ue measures the CSI and transmits the measured CSI to the base station, and N is the time delay when the base station schedules the RB according to the CSI measured at time T when the base station transmits downlink data. At time T + N, the utilization rate of the RB scheduled by the user equipment according to the CSI measured at time T may be low, and the CSI after the time delay may not accurately reflect the co-channel interference state of the downlink transmission channel currently transmitting the downlink data, so that the base station may not accurately determine the RANK value and the MCS to be used for transmitting the downlink data, and therefore, when the base station transmits the downlink data using the TB calculated by using the inaccurate MCS and the allocated RB, the efficiency of transmitting the downlink data is low.
Disclosure of Invention
Embodiments of the present invention provide a data transmission method and apparatus, which can effectively improve efficiency of transmitting downlink data.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, a data transmission method is provided, including:
a first base station acquires scheduling information of User Equipment (UE) in a first cell, scheduling information of a second cell, Reference Signal Received Power (RSRP) of the first cell measured by the UE and RSRP of the second cell, wherein the first cell is a cell registered by the UE, the second cell is a neighboring cell of the first cell, the first cell belongs to the first base station, and the second cell belongs to the second base station;
the first base station calculates a signal to interference plus noise ratio (SINR) predicted value of each RB allocated to the UE according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell and the RSRP of the second cell;
the first base station acquires an average value of SINR predicted values of RBs distributed for the UE;
the first base station acquires a modulation coding scheme MCS and a RANK value according to the average value of the SINR predicted values;
and the first base station determines a transmission block TB needed to be used for transmitting downlink data to the UE according to the RANK value, the MCS and the scheduling information of the UE, and transmits the downlink data to the UE.
In a second aspect, a first base station is provided, including:
an obtaining unit, configured to obtain, by a first base station, scheduling information of a user equipment UE in a first cell, scheduling information of a second cell, reference signal received power RSRP of the first cell measured by the UE, and RSRP of the second cell, where the first cell is a cell registered by the UE, the second cell is a neighboring cell of the first cell, the first cell belongs to the first base station, and the second cell belongs to the second base station;
a processing unit, configured to calculate, according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell, and the RSRP of the second cell, a signal-to-interference-plus-noise ratio SINR prediction value of each RB allocated to the UE;
the processing unit is further configured to obtain an average value of SINR predicted values of RBs allocated to the UE;
the processing unit is also used for acquiring a Modulation Coding Scheme (MCS) and a random value according to the average value of the SINR predicted value;
the determining unit is further configured to determine a transport block TB to be used for transmitting downlink data to the UE according to the RANK value, the MCS, and the scheduling information of the UE;
a sending unit, configured to transmit downlink data to the UE.
In a third aspect, a first base station is provided, including:
a memory, a processor, an interface between the first base station and a second base station, and a transceiver,
the memory for storing program code;
the processor is configured to obtain, by a first base station, scheduling information of a user equipment UE in a first cell, obtain, by the interface, scheduling information of a second cell, and obtain, by the transceiver, reference signal received power RSRP of the first cell and RSRP of the second cell measured by the UE, where the first cell is a cell registered by the UE, the second cell is a neighboring cell of the first cell, the first cell belongs to the first base station, and the second cell belongs to the second base station;
the processor is also used for calling the program codes stored in the memory to execute the following method: calculating a signal to interference plus noise ratio (SINR) predicted value of each RB allocated to the UE according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell and the RSRP of the second cell;
the processor-implemented method further comprises: acquiring an average value of SINR predicted values of RBs distributed for the UE;
the processor-implemented method further comprises: acquiring a modulation coding scheme MCS and a RANK value according to the average value of the SINR predicted values;
the processor-implemented method further comprises: and determining a transport block TB needed to be used for transmitting downlink data to the UE according to the RANK value, the MCS and the scheduling information of the UE, and transmitting the downlink data to the UE through the transceiver.
An embodiment of the present invention provides a data transmission method and apparatus, in which, compared with the prior art, an average value of SINR predicted values of RBs allocated to a UE is obtained according to scheduling information of the UE in a first cell, scheduling information of a second cell adjacent to the first cell registered by the UE, Reference Signal Received Power (RSRP) of the first cell and RSRP of the second cell, an SINR corresponding to a RANK value and the average value of the predicted values is obtained according to the average value of the SINR predicted values, and a TB required to be used for transmitting downlink data to the UE is determined according to the RANK value, the MCS and the scheduling information, and the downlink data is transmitted to the UE, therefore, the accuracy of the base station for calculating the SINR value of the scheduled UE of the first cell is improved, and the accuracy of MCS selection according to the SINR value, the efficiency of downlink data transmission and the throughput rate of the wireless communication system are further improved.
DrawingsIn order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram illustrating data transmission according to the prior art;
FIG. 2 is a flow chart of a data transmission method according to an embodiment of the present invention;
FIG. 3 is a flow chart of another data transmission method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first base station according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another first base station according to an embodiment of the present invention.
Detailed DescriptionThe technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The data transmission method and device are based on a base station in a wireless communication system, and the wireless communication system can be a Long Term Evolution (LTE) system or the subsequent Evolution of the LTE.
An embodiment of the present invention provides a data transmission method, applied to a base station, as shown in fig. 2, including:
step 101, a first base station acquires scheduling information of a UE in a first cell, scheduling information of a second cell, RSRP of the first cell measured by the UE, and RSRP of the second cell.
The scheduling information at least includes Resource Blocks (RBs) allocated to the UE of the first cell and RBs allocated to the neighboring cells, the first cell is a cell registered by the UE, the second cell is a neighboring cell of the first cell, the first cell belongs to the first base station, and the second cell belongs to the second base station.
And 102, the first base station calculates an SINR predicted value of each RB allocated to the UE according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell and the RSRP of the second cell.
Step 103, the first base station obtains an average value of SINR predicted values of RBs allocated to the UE.
And step 104, the first base station acquires the MCS and the RANK value according to the average value of the SINR predicted value.
And the first base station acquires the MCS corresponding to the average value of the SINR predicted value according to the corresponding relation between the SINR and the MCS.
And 105, the first base station determines a TB required to be used for transmitting downlink data to the UE according to the RANK value, the MCS, and the scheduling information of the UE, and transmits the downlink data to the UE.
Compared with the prior art, the method and the device have the advantages that the average value of the SINR predicted values of the RBs distributed for the UE is obtained according to the scheduling information of the UE in the first cell, the scheduling information of the second cell adjacent to the first cell registered by the UE, the RSRP of the first cell and the RSRP of the second cell, the MCS corresponding to the RANK value and the average value of the SINR predicted values is obtained according to the average value of the SINR predicted values, the TB required to be used for transmitting downlink data to the UE is determined according to the RANK value, the MCS and the scheduling information, the downlink data are transmitted to the UE, so that the accuracy of calculating the SINR value of the scheduled UE in the first cell by the base station is improved, and the accuracy of selecting the MCS according to the SINR value, the efficiency of transmitting the downlink data and the throughput rate of a wireless communication system are further improved.
An embodiment of the present invention provides a data transmission method, applied to a first base station, as shown in fig. 3, including:
step 2001, the first base station instructs the UE to perform an intra-frequency a3 measurement event.
The first base station presets an intra-frequency a3 measurement event. When the difference between the RSRP of the first cell and the RSRP of the second cell is greater than a preset RSRP threshold value, the first base station triggers a same-frequency A3 measurement event, indicates the UE to execute the same-frequency A3 measurement event, and acquires CSI fed back by the UE, wherein the CSI comprises a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI). The maximum value of the RSRP threshold may be 15 decibels (dB), and the minimum value of the RSRP threshold may be-15 dB.
The first cell is a cell registered by the UE, and the second cell is a neighboring cell of the first cell. The first cell belongs to the first base station, the second cell belongs to the second base station, the first base station and the second base station may be the same base station or different base stations, and the second cell and the first cell may be cells of the same base station or cells of different base stations. The RSRP is one of key parameters that can represent radio signal strength and physical layer measurement requirements in the LTE wireless communication network, and is an average value of reference signal power received on all Resource Elements (REs) that carry reference signals within a certain symbol (symbol).
Step 2002, the first base station receives CSI fed back by the UE.
The first base station receives CSI fed back by the UE by instructing the UE to execute an intra-frequency A3 measurement event, wherein the CSI comprises CQI and RI.
And step 2003, the first base station allocates RBs for the UE according to the CSI.
The first base station may determine how many RBs are allocated to the UE according to the CQI reported by the UE, the RI, and the amount of data to be scheduled by the UE, referring to 3rd Generation Partnership Project (3 GPP) protocol 36.213. Wherein, RB can be distributed by adopting any distribution formula of type0, type1 and type 2.
Step 2004, the first base station obtains the RB allocated by the second base station for the second cell.
It should be noted that, the first base station may obtain the RBs allocated by the second base station to the neighboring cell through a non-standard transmission interface, and may obtain the RBs of multiple second cells simultaneously according to different algorithms.
Step 2005, the first base station determines whether the RB allocated to the second cell and the RB allocated to the UE are the same.
If the RB allocated to the second cell is the same as the RB allocated to the UE and there is downlink data transmission in the RB allocated to the second cell, calculating an SINR prediction value for each RB allocated to the UE according to interference of a downlink transmission channel of the second cell to the UE, and performing step 2006;
if the RB allocated to the second cell is different from the RB allocated to the UE and there is no downlink data transmission in the RB allocated to the second cell, calculating an SINR prediction value of each RB allocated to the UE according to interference of the reference signal of the second cell to the UE, and performing step 2007.
And step 2006, the first base station calculates an SINR prediction value of each RB allocated to the UE according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell and the RSRP of the second cell by using a first formula.
If the RB allocated to the second cell is the same as the RB allocated to the UE, the UE of the second cell transmits data on the RB allocated to the second cell, and meanwhile, the UE of the first cell transmits data on the RB allocated to the UE of the first cell, a downlink transmission channel of the second cell interferes with the UE of the first cell, and RSRP of the second cell j can be ignored.
Specifically, when the RB with the number i allocated to the second cell j is the same as the RB with the number i allocated to the UE, k isjTaking 1, the first formula may be:
wherein i represents an RB assigned to the UE with number i, the RSRPSerCellAn RSRP representing the first cell, the RSRPjRSRP, k representing the second cell jjIndicating whether the RB with the number i, k is allocated to the second cell jjRSRPjAnd representing the interference of a downlink transmission channel of the second cell j to the UE, wherein N represents thermal noise.
And 2007, the first base station calculates an SINR predicted value of each RB allocated to the UE according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell and the RSRP of the second cell by a second formula.
If the RB allocated to the second cell is different from the RB allocated to the UE, the UE of the first cell transmits data on the RB allocated to the UE of the first cell, but the UE of the second cell does not transmit data on the RB allocated to the second cell, the RSRP of the second cell interferes with the UE of the first cell.
Specifically, when the RB with the number i allocated to the second cell j is different from the RB with the number i allocated to the UE, k isjTaking 0, the second formula may be:
wherein i represents an RB assigned to the UE with number i, the RSRPSerCellAn RSRP representing the first cell, the RSRPjRepresenting said second cell jRSRP, said kjIndicating whether the RB with number i is allocated to the second cell j, the β indicating an interference coefficient of a reference signal of the second cell j, the β (1-k)j)RSRPjRepresenting interference of a reference signal of the second cell j to the UE, the N representing thermal noise.
Step 2008, the first base station obtains an average value of the predicted SINR values of the RBs allocated to the UE.
The average value of SINR prediction values of RBs allocated for the UE may be obtained by a third formula,
the third formula is:
wherein the SINRiAnd the SINR predicted value of the RB with the number i allocated to the UE is expressed, and the N is expressed as the total number of the RBs allocated to the UE.
It should be noted that the first formula and the second formula can be obtained by a fourth formula. The fourth formula is:
when k isjWhen 1 is taken, 1-k in the fourth formulajIs 0, thus β ∑ (1-k)j)RSRPjIs 0, i.e. RSRP of the second cell j is negligible. When k isjWhen 0 is taken, Σ k in the fourth formulajRSRPj0, i.e. the RSRP of the second cell j interferes with the UE of the first cell.
And step 2009, the first base station acquires the MCS corresponding to the average value of the SINR prediction values according to the correspondence between the SINR and the MCS.
Step 2010, the first base station judges whether the average value of the SINR predicted values is larger than a preset SINR threshold value.
If the average value of the SINR predicted values is greater than a preset SINR threshold value, execute step 2011;
if the average value of the SINR prediction values is smaller than the preset SINR threshold value, go to step 2012.
In step 2011, the first base station obtains the RANK value of RI which is 2.
Step 2012, the first base station obtains the RANK value that RI takes 1.
It should be noted that RI is used to indicate the number of layers of TB mapped in the physical layer. Specifically, the mapping relationship may refer to the 36.211 protocol of 3 GPP.
For example, the RI takes 2 to indicate that the first base station may transmit two layers of TBs carrying data. When the average value of the SINR predicted values is greater than a preset SINR threshold value, the quality of a downlink transmission channel from the first base station to the UE in the first cell is good, multiple layers of TBs carrying data can be transmitted simultaneously, and the data do not interfere with each other. Thus, when the first base station obtains the RANK value of 2 for RI, the two layers of TBs carrying data are transmitted through the indication of 2 for RI, which can effectively improve the spectrum efficiency.
The RI takes 1 to indicate that the first base station can transmit one layer of TBs carrying data. And when the average value of the SINR predicted values is smaller than a preset SINR threshold value, the quality of a downlink transmission channel from the first base station to the UE of the first cell is poor, and the first base station transmits a layer of TB carrying data, so that the data are prevented from interfering with each other when the first base station transmits a plurality of layers of resource blocks carrying data.
Step 2013, the first base station determines a TB needed to be used for transmitting downlink data to the UE according to the RANK value, the MCS, and the scheduling information, and transmits the downlink data to the UE.
The first base station may determine, by looking up a table, a transport block TB to be used for transmitting downlink data to the UE according to a RANK value, an MCS, and a TBS index table defined by a protocol, and transmit the downlink data to the UE.
Compared with the prior art, the method and the device have the advantages that the average value of the SINR predicted values of the RBs distributed for the UE is obtained according to the scheduling information of the UE in the first cell, the scheduling information of the second cell adjacent to the first cell registered by the UE, the RSRP of the first cell and the RSRP of the second cell, the MCS corresponding to the RANK value and the average value of the SINR predicted values is obtained according to the average value of the SINR predicted values, the TB required to be used for transmitting downlink data to the UE is determined according to the RANK value, the MCS and the scheduling information, the downlink data are transmitted to the UE, so that the accuracy of calculating the SINR value of the scheduled UE in the first cell by the base station is improved, and the accuracy of selecting the MCS according to the SINR value, the efficiency of transmitting the downlink data and the throughput rate of a wireless communication system are further improved.
An embodiment of the present invention provides a first base station 30, as shown in fig. 4, including:
an obtaining unit 301, configured to obtain, by a first base station, scheduling information of a user equipment UE in a first cell, scheduling information of a second cell, reference signal received power RSRP of the first cell measured by the UE, and RSRP of the second cell, where the first cell is a cell registered by the UE, the second cell is a neighboring cell of the first cell, the first cell belongs to the first base station, and the second cell belongs to the second base station;
a processing unit 302, configured to calculate, according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell, and the RSRP of the second cell, a signal-to-interference-plus-noise ratio, SINR, prediction value of each RB allocated to the UE;
the processing unit 302 is further configured to obtain an average value of SINR predicted values of RBs allocated to the UE;
the processing unit 302 is further configured to obtain a modulation and coding scheme MCS and a RANK value according to an average value of the SINR prediction values;
the processing unit 302 is further configured to determine, according to the RANK value, the MCS, and scheduling information of the UE, a transport block TB needed to be used for transmitting downlink data to the UE;
a sending unit 303, configured to transmit downlink data to the UE.
Compared with the prior art, the method and the device have the advantages that the average value of the SINR predicted values of the RBs distributed for the UE is obtained according to the scheduling information of the UE in the first cell, the scheduling information of the second cell adjacent to the first cell registered by the UE, the RSRP of the first cell and the RSRP of the second cell, the MCS corresponding to the RANK value and the average value of the SINR predicted values is obtained according to the average value of the SINR predicted values, the TB required to be used for transmitting downlink data to the UE is determined according to the RANK value, the MCS and the scheduling information, the downlink data are transmitted to the UE, so that the accuracy of calculating the SINR value of the scheduled UE in the first cell by the base station is improved, and the accuracy of selecting the MCS according to the SINR value, the efficiency of transmitting the downlink data and the throughput rate of a wireless communication system are further improved.
The processing unit 302 is specifically configured to:
and when the RB allocated to the second cell is the same as the RB allocated to the UE and the RB allocated to the second cell has downlink data transmission, calculating the SINR predicted value of each RB allocated to the UE according to the interference of a downlink transmission channel of the second cell to the UE.
The processing unit 302 is specifically configured to:
calculating an SINR prediction value of each RB allocated to the UE according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell and the RSRP of the second cell by a first formula,
the first formula is:
wherein i represents an RB assigned to the UE with number i, the RSRPSerCellAn RSRP representing the first cell, the RSRPjRSRP, k representing the second cell jjIndicating whether the RB with the number i is allocated to the second cell j, and if the RB with the number i is allocated to the second cell j, k isjTake 1, k if the RB with the number i is not allocated to the second cell jjTake 0, kjRSRPjAnd representing the interference of a downlink transmission channel of the second cell j to the UE, wherein N represents thermal noise.
The processing unit 302 is specifically configured to:
and when the RB allocated to the second cell is different from the RB allocated to the UE and no downlink data transmission exists in the RB allocated to the second cell, calculating the SINR predicted value of each RB allocated to the UE according to the interference of the reference signal of the second cell to the UE.
The processing unit 302 is specifically configured to:
calculating an SINR prediction value of each RB allocated to the UE according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell and the RSRP of the second cell by a second formula,
the second formula is:
wherein i represents an RB assigned to the UE with number i, the RSRPSerCellAn RSRP representing the first cell, the RSRPjRSRP, k representing the second cell jjIndicating whether the RB with the number i is allocated to the second cell j, and if the RB with the number i is allocated to the second cell j, k isjTake 1, k if the RB with the number i is not allocated to the second cell jjTake 0, the β represents the interference coefficient of the reference signal of the second cell j, the β (1-k)j)RSRPjRepresenting interference of a reference signal of the second cell j to the UE, the N representing thermal noise.
The processing unit 302 is specifically configured to:
obtaining an average value of SINR predicted values of RBs allocated to the UE through a third formula,
the third formula is:
wherein the SINRiAnd the SINR predicted value of the RB with the number i allocated to the UE is expressed, and the N is expressed as the total number of the RBs allocated to the UE.
The obtaining unit 301 is specifically configured to:
determining scheduling information of the UE according to the received Channel State Information (CSI) fed back by the UE;
acquiring scheduling information of the second cell through an interface between the first cell and the second cell;
and receiving the RSRP of the first cell and the RSRP of the adjacent cell fed back by the UE according to the measurement event of the same frequency A3.
The processing unit 302 is specifically configured to:
judging whether the average value of the SINR predicted values is larger than a preset SINR threshold value or not;
if the average value of the SINR predicted values is larger than a preset SINR threshold value, acquiring a RANK Indicator (RI) with the RANK value of 2;
and if the average value of the SINR predicted values is smaller than a preset SINR threshold value, acquiring a RANK value of which the RANK indication RI is 1.
An embodiment of the present invention provides a first base station 40, as shown in fig. 5, including:
a memory 401, a processor 402, an interface 403 between the first and second base stations and a transceiver 404,
the memory 401 is used for storing program codes;
the processor 402 is configured to obtain, by a first base station, scheduling information of a user equipment UE in a first cell, obtain, by the transceiver 404, scheduling information of a second cell, and obtain, by the transceiver 404, reference signal received power RSRP of the first cell and RSRP of the second cell measured by the UE, where the first cell is a cell registered by the UE, the second cell is a neighboring cell of the first cell, the first cell belongs to the first base station, and the second cell belongs to the second base station;
the processor 402 is further configured to invoke the program code stored in the memory to perform the following method: calculating a signal to interference plus noise ratio (SINR) predicted value of each RB allocated to the UE according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell and the RSRP of the second cell;
the method performed by the processor 402 further comprises: acquiring an average value of SINR predicted values of RBs distributed for the UE;
the method performed by the processor 402 further comprises: acquiring a modulation coding scheme MCS and a RANK value according to the average value of the SINR predicted values;
the method performed by the processor 402 further comprises: and determining a transport block TB needed to be used for transmitting downlink data to the UE according to the RANK value, the MCS and the scheduling information of the UE, and transmitting the downlink data to the UE through the transceiver.
Compared with the prior art, the method and the device have the advantages that the average value of the SINR predicted values of the RBs distributed for the UE is obtained according to the scheduling information of the UE in the first cell, the scheduling information of the second cell adjacent to the first cell registered by the UE, the RSRP of the first cell and the RSRP of the second cell, the MCS corresponding to the RANK value and the average value of the SINR predicted values is obtained according to the average value of the SINR predicted values, the TB required to be used for transmitting downlink data to the UE is determined according to the RANK value, the MCS and the scheduling information, the downlink data are transmitted to the UE, so that the accuracy of calculating the SINR value of the scheduled UE in the first cell by the base station is improved, and the accuracy of selecting the MCS according to the SINR value, the efficiency of transmitting the downlink data and the throughput rate of a wireless communication system are further improved.
The method performed by the processor 402 further comprises:
and when the RB allocated to the second cell is the same as the RB allocated to the UE and the RB allocated to the second cell has downlink data transmission, calculating the SINR predicted value of each RB allocated to the UE according to the interference of a downlink transmission channel of the second cell to the UE.
The processor 402 performs a method comprising:
calculating an SINR prediction value of each RB allocated to the UE according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell and the RSRP of the second cell by a first formula,
the first formula is:
wherein i represents an RB assigned to the UE with number i, the RSRPSerCellAn RSRP representing the first cell, the RSRPjRSRP, k representing the second cell jjIndicating whether the RB with the number i is allocated to the second cell j, and if the RB with the number i is allocated to the second cell j, k isjTake 1, k if the RB with the number i is not allocated to the second cell jjTake 0, kjRSRPjAnd representing the interference of a downlink transmission channel of the second cell j to the UE, wherein N represents thermal noise.
The processor 402 performs a method comprising:
and when the RB allocated to the second cell is different from the RB allocated to the UE and no downlink data transmission exists in the RB allocated to the second cell, calculating the SINR predicted value of each RB allocated to the UE according to the interference of the reference signal of the second cell to the UE.
The processor 402 performs a method comprising:
calculating an SINR prediction value of each RB allocated to the UE according to the scheduling information of the UE, the scheduling information of the second cell, the RSRP of the first cell and the RSRP of the second cell by a second formula,
the second formula is:
wherein i represents an RB assigned to the UE with number i, the RSRPSerCellAn RSRP representing the first cell, the RSRPjRSRP, k representing the second cell jjIndicating whether the RB with the number i is allocated to the second cell j, and if the RB with the number i is allocated to the second cell j, k isjTake 1, k if the RB with the number i is not allocated to the second cell jjTake 0, the β represents the interference coefficient of the reference signal of the second cell j, the β (1-k)j)RSRPjRepresenting interference of a reference signal of the second cell j to the UE, the N representing thermal noise.
The processor 402 performs a method comprising:
obtaining an average value of SINR predicted values of RBs allocated to the UE through a third formula,
the third formula is:
wherein the SINRiAnd the SINR predicted value of the RB with the number i allocated to the UE is expressed, and the N is expressed as the total number of the RBs allocated to the UE.
The processor 402 performs a method comprising:
determining scheduling information of the UE according to the received Channel State Information (CSI) fed back by the UE;
acquiring scheduling information of the second cell through an interface between the first cell and the second cell;
and receiving the RSRP of the first cell and the RSRP of the adjacent cell fed back by the UE according to the measurement event of the same frequency A3.
The processor 402 performs a method comprising:
judging whether the average value of the SINR predicted values is larger than a preset SINR threshold value or not;
if the average value of the SINR predicted values is larger than a preset SINR threshold value, acquiring a RANK Indicator (RI) with the RANK value of 2;
and if the average value of the SINR predicted values is smaller than a preset SINR threshold value, acquiring a RANK value of which the RANK indication RI is 1.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks. The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.