CN109729537B - Transmission mode determining method and network side equipment - Google Patents
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Abstract
The invention provides a transmission mode determining method and network side equipment, and belongs to the technical field of wireless. The transmission mode determining method comprises the following steps: grouping users according to the number of the users participating in pairing and the channel correlation of a paired user set; and determining the transmission mode adopted by each group of users by taking the channel correlation among different groups of users as a judgment condition. The technical scheme of the invention can improve the downlink spectrum efficiency and the throughput of the cell.
Description
Technical Field
The present invention relates to the field of wireless technologies, and in particular, to a transmission mode determining method and a network device.
Background
The LTE (Long Term Evolution) downlink supports the 3D-MIMO (three-dimensional large-scale array) technology to multiplex the spatial dimension. The spatial multiplexing supports an SU-MIMO (single user multiple input multiple output) mode and an MU-MIMO (multiple user multiple input multiple output) mode. In SU-MIMO, a TM3/8 self-adaptive transmission mode is adopted, so that the throughput and the spectral efficiency of a single user are improved; in MU-MIMO, MU-MIMO of a TM8 internal or TM7 internal transmission mode is employed to improve throughput and spectral efficiency of the entire cell.
In the case of multi-user pairing, mutual interference exists between UE (user equipment) specific reference symbols of paired users, and throughput and spectral efficiency of the whole cell are reduced: on the one hand, for the case that the paired users exceed 4 and the spatial isolation between users is poor, the TM8 mode is adopted, the UE-specific reference symbol interference between multiple users will increase, thereby reducing the throughput of the system. On the other hand, for the case that the number of paired users is small and the spatial isolation is good, compared with the mode of using different orthogonal codes in the TM8 mode, the C-RNTI (Cell Radio Network Temporary Identifier) scrambling mode in the TM7 mode has larger interference between UE-specific reference symbols among multiple users and poorer performance. Aiming at the problems, a method of adaptively selecting a transmission mode TM7/TM8 is adopted according to the number of the users participating in the pairing and the correlation of channels, so that the orthogonality among the specific reference symbols of the multi-user UE is effectively improved, and the downlink spectrum efficiency and the throughput of a cell are improved.
However, the method of adaptively selecting the TM7/TM8 internal MU-MIMO is actually a result of a compromise, and has the following two problems:
on the one hand, when the number of users is greater than 4 (in this case, the maximum number of users that can be distinguished by UE-specific reference symbols in TM8 is exceeded), the interference between UE-specific reference symbols scrambled by C-RNTI (TM7 mode) is greater than the interference between 4 or more quasi-Orthogonal reference symbols composed of OCC (Orthogonal Code) and Scrambling identity (TM8 mode);
on the other hand, the TM7 mode internal MU-MIMO can only transmit data using single stream beamforming, and compared with the TM8 mode, the TM7 mode reduces the effective number of transmission streams per user.
Under the condition of multi-user pairing in a 3D-MIMO system, by adopting a mode of self-adaptive selection of MU-MIMO in a transmission scheme TM7 or TM8, when the number of paired users is more than 4, the optimal orthogonality among specific reference symbols of UE cannot be realized, and the effective transmission stream number of each user is limited, so that the overall throughput and the spectral efficiency of a cell are reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a transmission mode determination method and network side equipment, which can improve the downlink spectrum efficiency and throughput of a cell.
To solve the above technical problem, embodiments of the present invention provide the following technical solutions:
in one aspect, a transmission mode determining method is provided, including:
grouping users according to the number of the users participating in pairing and the channel correlation of a paired user set;
and determining the transmission mode adopted by each group of users by taking the channel correlation among different groups of users as a judgment condition.
Further, the grouping users according to the number of users participating in pairing and the channel correlation of the paired user set includes:
when the number of users participating in pairing is larger than a preset number N, sorting is carried out according to the channel correlation of a paired user set, the N users with the highest correlation are divided into a first group, other users are divided into a second group, and N is an integer larger than 1.
Further, the determining the transmission mode adopted for each group of users by using the channel correlation among different groups of users as a judgment condition includes:
if the maximum value of the channel correlation among the users respectively belonging to the first group and the second group exceeds a preset first threshold, adopting a TM7 transmission mode of C-RNTI scrambling for the first group of users and the second group of users;
if the maximum value of the channel correlation among the users belonging to the first group and the second group respectively does not exceed a preset first threshold, the TM8 transmission mode is adopted for the first group of users, and the TM7 transmission mode is adopted for the second group of users.
Further, after employing TM8 transmission mode for the first group of users and TM7 transmission mode for the second group of users, the method further includes canceling interference between the transmission mode mixed transmission data and the reference symbols and/or interference between the reference symbols.
Further, the eliminating the interference between the transmission data and the reference symbol and/or the interference between the reference symbols after the transmission mode mixing includes:
when the number of users of which the correlation between the user channels of the first group and the second group is smaller than a preset second threshold is larger than a preset third threshold, eliminating the interference between the data and the reference symbols after the transmission mode is mixed through beam forming and space division;
and when the number of users of which the correlation between the user channels of the first group and the second group is smaller than the preset second threshold is not larger than the preset third threshold, eliminating the interference between the transmission data and the reference symbols and the interference between the reference symbols after the transmission mode is mixed in a punching mode.
The embodiment of the invention also provides a network side device, which comprises a processor and a transceiver,
the processor is used for grouping the users according to the number of the users participating in the pairing and the channel correlation of the paired user set; and determining the transmission mode adopted by each group of users by taking the channel correlation among different groups of users as a judgment condition.
Further, the processor is specifically configured to, when the number of users participating in pairing is greater than a preset number N, sort according to the channel correlation size of the paired user set, divide the N users with the highest correlation into a first group, divide other users into a second group, and N is an integer greater than 1.
Further, the processor is specifically configured to employ a TM7 transmission mode scrambled by the C-RNTI for both the first group of users and the second group of users if a maximum value of channel correlation between users belonging to the first group and the second group, respectively, exceeds a preset first threshold; if the maximum value of the channel correlation among the users belonging to the first group and the second group respectively does not exceed a preset first threshold, the TM8 transmission mode is adopted for the first group of users, and the TM7 transmission mode is adopted for the second group of users.
Further, the processor is configured to employ a TM8 transmission mode for the first group of users and to cancel the interference between the transmission mode-mixed transmission data and the reference symbol and/or the interference between the reference symbols after employing a TM7 transmission mode for the second group of users.
Further, the processor is specifically configured to eliminate, when the number of users whose correlations between user channels of the first group and the second group are smaller than a preset second threshold is larger than a preset third threshold, interference between data and reference symbols after the transmission mode is mixed by beamforming and space division; and when the number of users of which the correlation between the user channels of the first group and the second group is smaller than the preset second threshold is not larger than the preset third threshold, eliminating the interference between the transmission data and the reference symbols and the interference between the reference symbols after the transmission mode is mixed in a punching mode.
The embodiment of the invention also provides network side equipment, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor; the processor implements the transmission mode determination method as described above when executing the program.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the transmission mode determination method as described above.
The embodiment of the invention has the following beneficial effects:
in the scheme, multi-user pairing between TM7 and TM8 transmission modes is realized according to correlation between paired user channels and the number of users, orthogonality between specific reference symbols of multi-user UE and the number of effective transmission streams of the users are further improved, and the spectrum efficiency and throughput of downlink MU-MIMO in a 3D-MIMO system can be effectively improved.
Drawings
Fig. 1 is a flowchart illustrating a transmission mode determining method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a punching position according to an embodiment of the present invention;
fig. 3 is a schematic diagram of 3D-MIMO downlink multi-user pairing according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a network-side device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
Embodiments of the present invention provide a transmission mode determining method and a network side device, which can improve downlink spectrum efficiency and throughput of a cell.
An embodiment of the present invention provides a transmission mode determining method, which is applied to a network side device, and as shown in fig. 1, the method includes:
step 101: grouping users according to the number of the users participating in pairing and the channel correlation of a paired user set;
step 102: and determining the transmission mode adopted by each group of users by taking the channel correlation among different groups of users as a judgment condition.
In the embodiment, multi-user pairing between TM7 and TM8 transmission modes is realized according to correlation between paired user channels and the number of users, orthogonality between specific reference symbols of multi-user UE and the number of effective transmission streams of the users are further improved, and the spectrum efficiency and throughput of downlink MU-MIMO in a 3D-MIMO system can be effectively improved.
Further, the grouping users according to the number of users participating in pairing and the channel correlation of the paired user set includes:
when the number of users participating in pairing is larger than a preset number N, sorting is carried out according to the channel correlation of a paired user set, the N users with the highest correlation are divided into a first group, other users are divided into a second group, and N is an integer larger than 1.
Further, the determining the transmission mode adopted for each group of users by using the channel correlation among different groups of users as a judgment condition includes:
if the maximum value of the channel correlation among the users respectively belonging to the first group and the second group exceeds a preset first threshold, adopting a TM7 transmission mode of C-RNTI scrambling for the first group of users and the second group of users;
if the maximum value of the channel correlation among the users belonging to the first group and the second group respectively does not exceed a preset first threshold, the TM8 transmission mode is adopted for the first group of users, and the TM7 transmission mode is adopted for the second group of users.
Further, after employing TM8 transmission mode for the first group of users and TM7 transmission mode for the second group of users, the method further includes canceling interference between the transmission mode mixed transmission data and the reference symbols and/or interference between the reference symbols.
Further, the eliminating the interference between the transmission data and the reference symbol and/or the interference between the reference symbols after the transmission mode mixing includes:
when the number of users of which the correlation between the user channels of the first group and the second group is smaller than a preset second threshold is larger than a preset third threshold, eliminating the interference between the data and the reference symbols after the transmission mode is mixed through beam forming and space division;
and when the number of users of which the correlation between the user channels of the first group and the second group is smaller than the preset second threshold is not larger than the preset third threshold, eliminating the interference between the transmission data and the reference symbols and the interference between the reference symbols after the transmission mode is mixed in a punching mode.
In the following, taking a network side device as a 3D-MIMO base station as an example, and referring to the accompanying drawings, a technical scheme of the present invention is described in detail, in this embodiment, a 3D-MIMO base station side calculates user priorities according to a PF algorithm, and estimates a total throughput of paired users to determine a set of paired users:
1. and when the number of the users participating in the pairing is higher than the threshold N, sorting according to the channel correlation of the paired user set, selecting N users with the highest correlation to be a group 1, and selecting other users with smaller correlation to be a group 2.
2. Considering the spatial isolation of multiple users among different groups, taking the correlation of channels among users in group 1 and group 2 as a judgment condition:
(1) if the maximum value of the channel correlation between the users belonging to group 1 and group 2 respectively exceeds a certain threshold Thr1, it indicates that the isolation between group 1 and group 2 is poor. At this point, users of the group 1 and the group 2 adopt the TM7 transmission mode scrambled by the C-RNTI, so as to reduce the interference caused by the mixing of the transmission modes between different groups.
(2) If the maximum value of the channel correlation between users belonging to group 1 and group 2 is lower than a certain threshold Thr1, the TM8 transmission mode is adopted for group 1, i.e., the N users with the worst isolation, and the TM7 transmission mode is adopted for the other users with better isolation in group 2. The interference avoidance strategy for the TM transmission mode hybrid UE-specific reference symbols among different groups is given as follows:
A. if the user channel correlation between different groups is smaller than the threshold Thr2 and the number of users is larger than the preset threshold Thr3, it shows that the space isolation of most users is better, and at this time, the base station side can eliminate the interference between the data and the reference symbol after the transmission mode is mixed through beamforming and space division.
B. If the user number of the user channel correlation among different groups is smaller than the threshold Thr2 is smaller than the preset threshold Thr3, two interferences should be considered to be deducted: including interference between UE-specific reference symbols, interference between UE-specific reference symbols and transmitted data. For the interference of two overlapping REs between UE-specific reference symbols in TM7 and TM8 and the overlapping REs with transmitted data, the interference needs to be reduced by puncturing at the base station side, and a specific puncturing position diagram is shown in fig. 2.
In addition, the following table shows specific embodiments of the transmission mode mixing in the case that the maximum value of the inter-user channel correlation respectively belonging to group 1 and group 2 is below a certain threshold Thr 1.
Fig. 3 is a schematic diagram of 3D-MIMO downlink multiuser pairing according to an embodiment of the invention.
An embodiment of the present invention further provides a network-side device, as shown in fig. 4, including a processor 21 and a transceiver 22,
the processor 21 is configured to group users according to the number of users participating in pairing and channel correlation of a paired user set; and determining the transmission mode adopted by each group of users by taking the channel correlation among different groups of users as a judgment condition.
In the embodiment, multi-user pairing between TM7 and TM8 transmission modes is realized according to correlation between paired user channels and the number of users, orthogonality between specific reference symbols of multi-user UE and the number of effective transmission streams of the users are further improved, and the spectrum efficiency and throughput of downlink MU-MIMO in a 3D-MIMO system can be effectively improved.
Further, the processor 21 is specifically configured to, when the number of users participating in pairing is greater than a preset number N, sort according to the channel correlation size of the paired user set, divide the N users with the highest correlation into a first group, divide other users into a second group, and N is an integer greater than 1.
Further, the processor 21 is specifically configured to employ a TM7 transmission mode scrambled by the C-RNTI for both the first group of users and the second group of users if a maximum value of channel correlation between users belonging to the first group and the second group respectively exceeds a preset first threshold; if the maximum value of the channel correlation among the users belonging to the first group and the second group respectively does not exceed a preset first threshold, the TM8 transmission mode is adopted for the first group of users, and the TM7 transmission mode is adopted for the second group of users.
Further, the processor 21 is further configured to employ a TM8 transmission mode for the first group of users, and to cancel the interference between the transmission data and the reference symbol and/or the interference between the reference symbols after the TM7 transmission mode is employed for the second group of users.
Further, the processor 21 is specifically configured to eliminate, when the number of users whose correlations between user channels of the first group and the second group are smaller than the preset second threshold is larger than the preset third threshold, interference between the data and the reference symbols after the transmission mode is mixed by beamforming and space division; and when the number of users of which the correlation between the user channels of the first group and the second group is smaller than the preset second threshold is not larger than the preset third threshold, eliminating the interference between the transmission data and the reference symbols and the interference between the reference symbols after the transmission mode is mixed in a punching mode.
The embodiment of the invention also provides network side equipment, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor; the processor implements the transmission mode determination method as described above when executing the program.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the transmission mode determination method as described above.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A transmission mode determination method, comprising:
grouping users according to the number of the users participating in pairing and the channel correlation of a paired user set;
determining a transmission mode adopted by each group of users by taking the channel correlation among different groups of users as a judgment condition, wherein the method comprises the following steps:
if the maximum value of the channel correlation among the users respectively belonging to the first group and the second group exceeds a preset first threshold, adopting a TM7 transmission mode of C-RNTI scrambling for the first group of users and the second group of users;
if the maximum value of the channel correlation among the users belonging to the first group and the second group respectively does not exceed a preset first threshold, the TM8 transmission mode is adopted for the first group of users, and the TM7 transmission mode is adopted for the second group of users.
2. The method of claim 1, wherein grouping users according to the number of users participating in pairing and the channel correlation of the paired user set comprises:
when the number of users participating in pairing is larger than a preset number N, sorting is carried out according to the channel correlation of a paired user set, the N users with the highest correlation are divided into a first group, other users are divided into a second group, and N is an integer larger than 1.
3. The transmission mode determination method of claim 2, wherein after employing a TM8 transmission mode for the first group of users and a TM7 transmission mode for the second group of users, the method further comprises canceling interference between the transmission data and the reference symbols and/or interference between the reference symbols after the transmission mode mixing.
4. The method according to claim 3, wherein the eliminating interference between the transmission data and the reference symbols and/or the interference between the reference symbols after the transmission mode is mixed comprises:
when the number of users of which the correlation between the user channels of the first group and the second group is smaller than a preset second threshold is larger than a preset third threshold, eliminating the interference between the data and the reference symbols after the transmission mode is mixed through beam forming and space division;
and when the number of users of which the correlation between the user channels of the first group and the second group is smaller than the preset second threshold is not larger than the preset third threshold, eliminating the interference between the transmission data and the reference symbols and the interference between the reference symbols after the transmission mode is mixed in a punching mode.
5. A network side device, comprising a processor and a transceiver,
the processor is used for grouping the users according to the number of the users participating in the pairing and the channel correlation of the paired user set; determining a transmission mode adopted by each group of users by taking the channel correlation among different groups of users as a judgment condition;
the processor is specifically configured to employ a TM7 transmission mode scrambled by the C-RNTI for both the first group of users and the second group of users if a maximum value of channel correlation between users belonging to the first group and the second group respectively exceeds a preset first threshold; if the maximum value of the channel correlation among the users belonging to the first group and the second group respectively does not exceed a preset first threshold, the TM8 transmission mode is adopted for the first group of users, and the TM7 transmission mode is adopted for the second group of users.
6. The network-side device of claim 5,
the processor is specifically configured to sort the users participating in pairing according to the channel correlation of the paired user set when the number of the users participating in pairing is greater than a preset number N, the N users with the highest correlation are divided into a first group, the other users are divided into a second group, and N is an integer greater than 1.
7. The network-side device of claim 5,
the processor is further configured to employ a TM8 transmission mode for the first group of users and cancel the interference between the transmission data and the reference symbols and/or the interference between the reference symbols after the TM7 transmission mode is employed for the second group of users.
8. The network-side device of claim 7,
the processor is specifically configured to eliminate interference between data and reference symbols after transmission mode mixing through beamforming and space division when the number of users whose user channel correlations of the first group and the second group are smaller than a preset second threshold is larger than a preset third threshold; and when the number of users of which the correlation between the user channels of the first group and the second group is smaller than the preset second threshold is not larger than the preset third threshold, eliminating the interference between the transmission data and the reference symbols and the interference between the reference symbols after the transmission mode is mixed in a punching mode.
9. A network-side 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 transmission mode determination method according to any one of claims 1 to 4 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the transmission mode determination method according to any one of claims 1 to 4.
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