CN107846266B - Time-frequency resource space division scheduling method and device - Google Patents

Time-frequency resource space division scheduling method and device Download PDF

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CN107846266B
CN107846266B CN201610826236.XA CN201610826236A CN107846266B CN 107846266 B CN107846266 B CN 107846266B CN 201610826236 A CN201610826236 A CN 201610826236A CN 107846266 B CN107846266 B CN 107846266B
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CN107846266A (en
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王小锋
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows

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Abstract

The invention discloses a time frequency resource space division scheduling method and a device, wherein the method comprises the following steps: calculating channel correlation of a plurality of terminals; acquiring scheduling information of a plurality of terminals; dividing a plurality of terminals into one or a plurality of space division terminal groups according to the channel correlation of the plurality of terminals and the scheduling information of the plurality of terminals; calculating scheduling parameters of a plurality of space division terminal groups in the scheduling according to one or more space division terminal groups and scheduling information of the terminals; and according to the time-frequency resources of space division and the scheduling parameters of one or more space division terminal groups, calculating the space division terminal groups actually used for space division scheduling and the number of the terminals actually used for space division scheduling, selecting corresponding terminals and allocating the time-frequency resources for scheduling. The technical scheme of the invention is suitable for space division scheduling, thereby fully playing the capacity of space division scheduling, and being beneficial to improving the channel capacity and improving the efficiency of time-frequency resource scheduling.

Description

Time-frequency resource space division scheduling method and device
Technical Field
The invention relates to the field of wireless communication, in particular to a time-frequency resource space division scheduling method and device.
Background
The MIMO (Multiple Input Multiple Output) technology is a core technology of an LTE (Long Term Evolution) system, and by using Multiple transmitting antennas and Multiple receiving antennas at a transmitting end and a receiving end, system channel capacity is increased by Multiple times without increasing time-frequency resources through transmission and reception of the Multiple antennas.
Just because of the importance of the MIMO technology, 8 downlink transmission modes are proposed from Rel-8 version of the LTE protocol, and MIMO and SDMA (Spatial Division Multiple Access) technologies are introduced. The 3GPP (3rd Generation Partnership Project, third Generation Partnership Project) continuously supports higher-order SDMA capability by updating the LTE protocol, thereby increasing the system channel capacity. FD-MIMO (Full-Dimension MIMO, omni-directional MIMO) is proposed by 3GPP in the standardized Rel-13 protocol, but not frozen yet, and higher-order spatial multiplexing capability is achieved by means of large-scale antenna array technology (using 64, 128, 256 or more antenna elements, reducing interference, improving signal to noise ratio, and improving signal transceiving performance).
FD-MIMO systems support 64, 128, 256 or even more antenna elements. With the increase of the number of the antenna oscillators, the system channel capacity can be improved by multiple times of the existing antenna system. The emergence of high-order SDMA has brought new challenges to the scheduling of wireless communication systems. At present, the scheduling method and resource allocation mode aiming at space division capacity of 2-stream and 4-stream cannot meet the requirement of high-order SDMA. The main challenges are presented in four areas:
firstly, time-frequency resource allocation: in the scheduling method for 2-stream and 4-stream SDMA, the traffic gain due to space division is limited, and therefore a resource allocation method with priority frequency division is generally adopted. However, under the condition of higher-order SDMA capability, if a resource scheduling method of priority frequency division is still adopted, the SDMA capability of the system cannot be fully exerted, and time-frequency resources are wasted;
II, inter-stream interference: higher order SDMA systems tend to produce stronger inter-stream interference than lower order SDMA systems. Under the condition of stronger inter-stream interference, how to determine scheduling parameters and overcome the inter-stream interference is a problem to be solved by high-order SDMA scheduling;
and thirdly, multi-user multi-service types: under the commercial network environment, the user types and the service types are rich and colorful, and the large service package users and the small service package users exist; there are both real-time and non-real-time services. How to fully utilize the advantages of the space division and multi-stream technology, and schedule various types of services with different packet sizes and different packet delays, thereby improving the spectrum efficiency;
fourthly, processing the scheduling process and the scheduling parameters: if the low-order SDMA technique is continuously adopted, it is not suitable to process scheduling parameters, including but not limited to BLER (Block Error rate), CQI (Channel Quality Indicator), SINR (Signal to Interference plus Noise Ratio), BSR (Buffer Status Report), etc. For example, space division multiplexing of downlink traffic, UE (User Equipment, terminal) participating in space division scheduling needs to allocate power, and when the power available to each UE is lower, how to determine a scheduled MCS (modulation and coding strategy) according to SINR and CQI is different under the condition of higher-order SDMA technology.
The above four main key problems are presented, and are also the problems to be solved by using higher order SDMA technology to increase the system channel capacity.
Disclosure of Invention
In view of the above, the present invention provides a time-frequency resource space division scheduling method and apparatus, so as to improve channel capacity and implement efficient scheduling of time-frequency resources.
The technical scheme adopted by the invention for solving the technical problems is as follows:
according to one aspect of the present invention, a time-frequency resource space division scheduling method is provided, which includes: calculating channel correlation of a plurality of terminals; acquiring scheduling information of the plurality of terminals; dividing the plurality of terminals into one or a plurality of space division terminal groups according to the channel correlation of the plurality of terminals and the scheduling information of the plurality of terminals; calculating scheduling parameters of the space division terminal groups in the scheduling according to the one or more space division terminal groups and scheduling information of the terminals; and calculating the space division terminal group actually used for space division scheduling and the number of the terminals actually used for space division scheduling according to the space division time frequency resources and the scheduling parameters of the one or more space division terminal groups, selecting the corresponding terminals and allocating the time frequency resources for scheduling.
Optionally, the method for calculating the scheduling parameters of the one or more space division terminal groups in the current scheduling according to the plurality of space division terminal groups and the scheduling information of the terminals includes: calculating the initial value of the number of the space division streams of the current scheduling according to the one or more space division terminal groups and the scheduling information of the terminals; estimating the influence generated by the inter-flow interference according to the initial value of the number of the space division flows; and calculating the scheduling parameters of the plurality of space division terminal groups according to the estimation result.
Optionally, in the foregoing method, according to the channel correlations of the multiple terminals and the scheduling information of the multiple terminals, the dividing the multiple terminals into one or more space division terminal groups specifically includes: dividing a space division selectable terminal set from the plurality of terminals according to the channel correlation and the channel priority of the plurality of terminals; and dividing the terminals in the space division selectable terminal set into one or more space division terminal groups according to the corresponding scheduling information division method.
Optionally, the method, for a terminal in the space division selectable terminal set, dividing the terminal into the one or more space division terminal groups according to the corresponding scheduling information division method, specifically includes: sorting the terminals in the space division selectable terminal set according to the channel correlation and the channel priority of the plurality of terminals; and acquiring the terminals according to the sequence of the terminals in the space division selectable terminal set, and dividing the space division terminal group containing the acquired terminals according to the channel correlation and scheduling information of the acquired terminals and other terminals.
Optionally, in the foregoing method, the plurality of terminals include a terminal performing a retransmission operation, and the number of retransmissions is less than a preset threshold.
According to another aspect of the present invention, a time-frequency resource space division scheduling apparatus is provided, which includes: a channel correlation module for calculating channel correlations of a plurality of terminals; the scheduling information module is used for acquiring scheduling information of the plurality of terminals; a space division terminal grouping module, configured to group the multiple terminals into one or more space division terminal groups according to the channel correlations of the multiple terminals and the scheduling information of the multiple terminals; a scheduling parameter module, configured to calculate scheduling parameters of the space division terminal groups in the current scheduling according to the one or more space division terminal groups and scheduling information of the terminals therein; and the scheduling module is used for calculating the space division terminal group actually used for space division scheduling and the number of the terminals actually used for space division scheduling according to the space division time-frequency resources and the scheduling parameters of the one or more space division terminal groups, selecting the corresponding terminals and allocating the time-frequency resources for scheduling.
Optionally, in the foregoing apparatus, the scheduling parameter module calculates an initial value of the number of spatial division streams of the current scheduling according to the one or more groups of spatial division terminals and scheduling information of terminals therein, estimates an influence caused by inter-stream interference according to the initial value of the number of spatial division streams, and calculates scheduling parameters of the plurality of groups of spatial division terminals according to an estimation result.
Optionally, in the foregoing apparatus, the space division terminal grouping module divides a space division selectable terminal set from the multiple terminals according to the channel correlations and the channel priorities of the multiple terminals, and divides the terminals in the space division selectable terminal set into the one or more space division terminal groups according to corresponding scheduling information division methods.
Optionally, in the foregoing apparatus, the space division terminal grouping module ranks the terminals in the space division selectable terminal set according to the channel correlations and the channel priorities of the multiple terminals, obtains the terminals according to the rank of the terminals in the space division selectable terminal set, and divides the space division terminal group including the obtained terminal according to the channel correlations and the scheduling information of the obtained terminal and other terminals.
Optionally, in the apparatus, the plurality of terminals include a terminal performing a retransmission operation, and the number of retransmissions is less than a preset threshold.
According to the technical scheme, the time-frequency resource space division scheduling method and the time-frequency resource space division scheduling device have the advantages that:
in the technical scheme of the invention, the terminal is divided into a plurality of space division terminal groups according to the channel correlation of the terminal, and the channel correlation among the plurality of space division terminal groups is lower and is suitable for space division scheduling; determining a scheduling parameter used in scheduling according to the scheduling information of the terminal, thereby successfully completing space division scheduling; the technical scheme of the invention is suitable for space division scheduling, thereby fully playing the capacity of space division scheduling, and being beneficial to improving the channel capacity and improving the efficiency of time-frequency resource scheduling.
Drawings
Fig. 1 is a flowchart of a time-frequency resource space division scheduling method according to an embodiment of the present invention;
fig. 2 is a flowchart of a time-frequency resource space division scheduling method according to an embodiment of the present invention;
fig. 3 is a block diagram of a time-frequency resource space division scheduling apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a time-frequency resource space division scheduling apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a time-frequency resource space division scheduling apparatus according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, an embodiment of the present invention provides a time-frequency resource space division scheduling method, including:
step S110 calculates channel correlations of a plurality of terminals. In this embodiment, the channel correlation between different UEs is processed, including the reception of the channel correlation between different UEs. For a TDD (Time Division multiplexing) system, channel correlation between terminals can be calculated by detecting pilots transmitted by different terminals; for an FDD (Frequency Division multiplexing) system, a terminal detects a RS (Reference Signal, pilot) Signal of a downlink channel, calculates channel information, reports the obtained channel information to a base station, and the base station calculates and determines channel correlation according to the channel information reported by the UE.
Smoothing of channel correlation between UEs: based on the time variability and instability of the wireless channel in the large-scale fading channel environment, the correlation of the received channel needs to be smoothed and filtered.
Figure BDA0001115456670000051
Figure BDA0001115456670000052
Representing a correlation value to be obtained after the current filtering;
Figure BDA0001115456670000053
representing a correlation value obtained after the last filtering;
Corrn: representing a currently obtained relevance real-time value;
α: and the filter coefficient is represented, and the value range is [0,1 ]. 1 denotes no filtering. The default value may be 1/16, which may be dynamically adjusted according to the channel environment.
Step S120, obtaining scheduling information of a plurality of terminals. In this embodiment, the scheduling information of the terminal includes, but is not limited to, BLER, CQI, SINR, BSR, and the like.
Step S130, according to the channel correlations of the multiple terminals and the scheduling information of the multiple terminals, the multiple terminals are divided into one or more space division terminal groups. In the embodiment, the channel correlation between different space division terminal groups is low; in this embodiment, in scheduling, according to channel correlation between different UEs, UE information participating in scheduling, and BSR/SINR/CQI of a UE to be scheduled, UEs that can be spatially divided and spatial-divided UEs to be screened are determined to be grouped according to parameters of the UEs, such as BSR/SINR/CQI. In this embodiment, the obtained null UE packets are divided according to the channel correlation, and the channel correlation between them is low, so that the null UE packets are suitable for null scheduling.
Step S140, according to one or more space division terminal groups and scheduling information of terminals therein, calculates scheduling parameters of multiple space division terminal groups in the current scheduling. In this embodiment, the scheduling parameters include, but are not limited to, MCS.
And step S150, calculating the space division terminal group actually used for space division scheduling and the number of the terminals actually used for space division scheduling according to the space division time frequency resources and the scheduling parameters of one or more space division terminal groups, selecting the corresponding terminals and allocating the time frequency resources for scheduling.
As shown in fig. 2, an embodiment of the present invention provides a time-frequency resource space division scheduling method, including:
step S210 calculates channel correlations of a plurality of terminals. In this embodiment, channel correlation values for different UEs are calculated and maintained. Preferably, the real-time channel correlation values may be further processed to avoid excessive jitter in the correlation values.
Step S220, according to the channel correlation and the channel priority of the plurality of terminals, a space division selectable terminal set is divided from the plurality of terminals. In the embodiment, the space division optional user set S is maintained according to the correlation between the UE and the UEselectThe method specifically comprises the following steps:
from the active subscriber set SacitveDetermining a spatial selectable user set Sselect. Let a total of m users in the set of active users. During initialization, the space division is enabled to select a user set SselectS1 may be derived from S1acitveAccording to the user with the highest priority. After the scheduling is started, users which are suitable for space division except S1 in the active set are added into SselectPerforming the following steps; while not being at SacitveThe user in (1), needs to go from SselectDeleting; in scheduling, S isacitveAnd SselectThe UE in the set is sorted according to the scheduling priority; UE (user Equipment)1，UE2，...，UEn(II. ltoreq. III), proceeding from the sequence in order from high to low; and (6) traversing. Sequentially processing COR according to the sequence of traversing i first and then ji，j(1≤i＜n，1＜j≤n)，CORi,jIndicating the channel correlation between UEi and UEj. If there is CORi，j＜ThrCORIt means that the channels of UEi and UEj are not related. Thr (Thr)CORThe threshold is determined for channel correlation and may be derived from simulation or external field actual verification. After i and j traverse, obtaining a new space division optional user set UE1′，UE2′，...，UEn′(n' ≦ m), the ranking order of the UEs in the set is sorted according to the channel correlation of the UEs and the scheduling priorities of the UEs, with the user with the lowest channel correlation and the highest scheduling priority ranked first.
In step S230, scheduling information of a plurality of terminals is acquired. Specifically, the method may include:
receiving and maintaining sacitveSINR values for each UE in the queue are used to support scheduling. Preferably, the real-time SINR values may be further processed to avoidThe SINR jitter is too large;
receive and maintain SacitveCQI values for each UE in the queue. Preferably, the real-time CQI value may be further processed to avoid excessive CQI jitter;
receive and maintain SacitveBLER values for each UE in the queue. Preferably, the real-time BLER of each UE may be further processed to avoid BLER jitter being too large;
receive and maintain SacitveBSR values for each UE in the queue. Under the condition that the number of the scheduled users is small, delay scheduling can be considered for the UE with small BSR, the traffic of single scheduling is increased, and the space division performance is improved.
And step S240, dividing the terminals in the space division selectable terminal set into one or more space division terminal groups according to the corresponding scheduling information division method. Based on the foregoing, in the present embodiment, the selectable user set S is selected according to the current space divisionSelect＝[UE1′，UE2′，...，UEn′]And determining the grouping of the space division UE according to the SINR value, CQI value, BSR value and the scheduled MCS initial value of each UE (n' is less than or equal to m). The method specifically comprises the following steps:
sorting the terminals in the space optional terminal set according to the channel correlation and the channel priority of the plurality of terminals; and acquiring the terminals according to the sequence of the terminals in the space division selectable terminal set, and dividing the space division terminal group containing the acquired terminals according to the channel correlation and scheduling information of the acquired terminals and other terminals. In this embodiment, preferably, the UE may be ranked by comprehensively considering the correlation coefficient value and the channel priority of the UE in the scheduling, and the UE with low correlation and high channel priority is ranked in front. And then according to the UE sequence table, according to the sequence of the UE, simultaneously referring to the BSR, SINR and CQI of the UE, and performing space division UE grouping. The grouping aims to divide the UEs with similar BSR, SINR and CQI into the same empty group as much as possible under the condition that the channel correlation is lower than the dynamic threshold in the UE sequence table. The grouping result is maintained in the form of a space division UE grouping table and a space division UE scheduling information table.
An example of the result of the spatial division processing, spatial division UE packet protection, is described belowIs stored in a null UE packet table; suppose a UE of the first null packet in the null packet tableG1_1(ii) a The following table gives the space division UEG1_1The scheduling information of (2) is specifically as follows:
Figure BDA0001115456670000071
Figure BDA0001115456670000081
the above table takes ms (millisecond) as a time unit, and stores UEG1_1Including but not limited to the UE associated with each scheduling instantG1_1Correlation information of (1), SINR, CQI, BLER, and BSR information. The time range subscripts x1, x2, … … xn, which consecutively record n times of UEsG1_1The scheduling information, x1, x2, … … xn, corresponds to the frame number and subframe number of the system scheduling one by one, the size of n is set to meet the scheduling time length of new transmission and retransmission, and the reference setting value of n can be 20 according to the current downlink and uplink HARQ time sequence and the maximum retransmission times.
Step S250, calculating an initial value of the number of space division streams of the current scheduling according to one or more space division terminal groups and scheduling information of terminals therein. In this embodiment, the null-space UE packet and the scheduling parameter of each null-space UE packet are determined according to the null-space UE packet table and the null-space UE scheduling information table, so as to form a null-space UE packet scheduling parameter table. In this embodiment, the processing result "null UE packet table" in the previous step is used as the input of this stage; and using the processing result 'space division UE scheduling information table' of the previous step as the input of the stage; and determining the number m of the null UE packets scheduled this time and the number n of the UE of each null packet according to the null UE packet table and the null UE information table. And determining the initial value of the number of the space division streams by m and n.
Figure BDA0001115456670000082
X represents the sum of the number of all null UEs in the m null packets. Null of this schedulingThe initial value of the fractional flow number M ═ min { X, X }. x represents the maximum number of spatial streams supported by the system, and this value is determined after the system design is determined. In this embodiment, according to the determined null UE packet information, null stream preprocessing is performed to obtain an initial value M of null stream number. The processing method can determine the number of streams and space division UE which can be space divided in the scheduling according to the space division capacity of the system and the space division UE information group information.
And step S260, estimating the influence generated by the inter-flow interference according to the initial value of the number of the space division flows. In this embodiment, the influence of inter-stream interference on data reception is estimated based on the initial value M of the number of spatial streams. For a set of UEs participating in spatial division UE1，UE2，......UEMTo UEiAt the UEjIt appears to be an interfering signal. Inter-stream interference can drive up channel noise. The interference effects of different streams can be obtained by channel simulation.
The following table is a table of gain attenuation values for inter-stream interference. The attenuation of the gain brought about in the case of different air streams is shown.
Number of streams Gain attenuation (dB)
2 -3
3 Δ2
4 Δ3
…
x Δx
In the following CQI space division Compensation gain Table, CijRepresenting a UEmAnd UEnWhen performing space division between the UEsmHas a CQI value of i, UEnThe CQI value of (d) is the space division gain compensation value at j. When the UE ismAnd UEnWhen the combination of CQI values falls in the blank position of the following table, the UE is not advised at this timemAnd UEnSpace division is performed, and since space division is forced at this time, the transmission rate of the UE of the high-order CQI is greatly decreased, and the transmission efficiency is rather decreased.
Figure BDA0001115456670000091
Figure BDA0001115456670000101
And step S270, calculating scheduling parameters of a plurality of space division terminal groups according to the estimation result. In this embodiment, the scheduling parameters for each null UE group are determined based on the estimation of the impact of inter-stream interference. The determination of the MCS for the null packet is processed according to equation 2 below.
MCSGn＝MCSAMC+ΔM+Cij+BFGain(formula 2)
MCSGnMCS, MCS for scheduling of Gn-th null packetAMCIndicates MCS, Delta, obtained by AMC (adaptive modulation and coding) processMDenotes the gain attenuation of the inter-stream interference (subscript M denotes the number of spatial streams), C, obtained by looking up the gain attenuation value table of the inter-stream interferenceijIndicating the CQI space division compensating gain, BF, obtained by looking up the CQI space division compensating gain tableGainThe antenna gain is indicated.
Go through the bookThe processing of the embodiment initially determines the UE groups UE that can be spatially separatedG1、UEG2、……UEGMAnd simultaneously preliminarily determines the MCS of each space division UE packet schedulingG1、MCSG2、……MCSGMAnd determining a space division UE packet scheduling parameter table. In this embodiment, for the spatial division UE, SDMA multi-stream transmission is performed on the same frequency point and the same time-frequency resource, which may cause serious inter-stream interference. Under the condition of space division, in order to reduce the influence of inter-stream interference and ensure the analysis performance of the traffic channel, one method that can be adopted is to reduce the MCS (Modulation and Coding Scheme) according to the CQI and SINR so that the analysis accuracy of the traffic channel is kept within a proper range.
Step S280, according to the time frequency resource of space division and the scheduling parameter of one or more space division terminal groups, the space division terminal group actually used for space division scheduling and the number of the terminals actually used for space division scheduling are calculated, and corresponding terminals are selected and the time frequency resource is distributed for scheduling. In this embodiment, the obtained space division UE packet scheduling parameter table is obtained; acquiring frequency division UE scheduling information and available time-frequency resources; and uniformly scheduling the space division UE and the frequency division UE according to the space division UE group scheduling parameters, the frequency division UE scheduling information, the available time-frequency resources and the power compensation. And determining the UE group and the frequency division UE which can actually carry out space division scheduling. After processing by this embodiment, for MCSGnLess than MCSthresholdThe space division UE group preferably adopts frequency division scheduling, so that the condition that the data receiving result is too poor due to forced space division is avoided. MCS (modulation and coding scheme)thresholdThe threshold is the lowest MCS threshold currently available for spatial division, and a spatial UE packet below this threshold is not suitable for spatial division scheduling. MCS (modulation and coding scheme)thresholdAnd according to the channel environment of the current space packet UE participating in scheduling, carrying out dynamic adjustment and implementing scheduling.
In the present embodiment, the outline of the above process is as follows: determining total time frequency resources which can be used by the scheduling, wherein the total time frequency resources comprise space division time frequency resources and frequency division time frequency resources; allocating time-frequency resources according to the UE information of space division and frequency division; meanwhile, according to the space division UE group information and the space division UE scheduling information, in combination with power compensation, available scheduling parameters including but not limited to MCS of each space division packet are determined. In the processing process, if the influence of inter-stream interference on the receiving performance is not enough to overcome after parameters such as MCS and the like are adjusted, the number of streams for space division needs to be reduced, even the number of streams for space division is reduced to no space division; recording scheduling information of the UE scheduled at this time, including but not limited to space division information and scheduling information of the UE; and carrying out scheduling.
Further, the plurality of terminals in this embodiment include a terminal that performs a retransmission operation, and the number of retransmissions is less than a preset threshold. In this embodiment, if a receiving end does not successfully receive a TB (Transport Block) transmitted in a space division manner and needs to retransmit the TB, the space division transmission manner may still be used to improve the spectrum efficiency of cell transmission as much as possible. If the TB of a certain UE is continuously transmitted in a space division mode for N times and still fails, the transmission mode of the UE is recommended to be returned to frequency division scheduling, and the value taking recommendation of the times N is not less than 2. For retransmission, the present embodiment also gives the following description:
for retransmission, the adaptive retransmission downlink data transmission and uplink data transmission are consistent in the space division scheduling processing mode of retransmission and new transmission; for non-adaptive retransmission uplink data transmission, because the size of the retransmitted TB (Transport Block) needs to be consistent with the size of the newly transmitted TB Block, the following three ways can be adopted:
(1) whether a single UE or a plurality of UEs need to be retransmitted, the retransmission is carried out by adopting a frequency division scheduling mode, so that the processing is simplified;
(2) if a plurality of UEs needing retransmission just belong to the same null packet corresponding to the newly transmitted time of the retransmission, and the retransmission of the UE is still suitable for space division after space division judgment, null packet selection, inter-stream interference, power compensation and scheduling parameter configuration, the plurality of UEs needing retransmission can carry out space division retransmission;
(3) if a plurality of UE needing retransmission do not belong to the same empty packet corresponding to the newly transmitted time of the retransmission, and the scheduling parameters including MCS, RB resources and the like in the newly transmitted scheduling have large difference, frequency division scheduling is recommended; or adopting space division scheduling judgment, adopting a best-effort space division scheduling mode, and adopting space division scheduling if the space division scheduling is available; otherwise, frequency division scheduling is adopted.
As shown in fig. 3, an embodiment of the present invention provides a time-frequency resource space division scheduling apparatus, including:
the channel correlation module 310 calculates channel correlations for a plurality of terminals. In this embodiment, the channel correlation between different UEs is processed, including the reception of the channel correlation between different UEs. For a TDD (Time Division duplex) system, channel correlation between terminals can be calculated by detecting pilots transmitted by different terminals; for an FDD (Frequency Division Duplex) system, a terminal detects a downlink channel RS (Reference Signal, pilot) Signal, calculates channel information, and uses the obtained channel information to calculate channel correlation according to the channel information reported by the UE.
Smoothing of channel correlation between UEs: based on the time variability and instability of the wireless channel in the large-scale fading channel environment, the correlation of the received channel needs to be smoothed and filtered.
Figure BDA0001115456670000121
Figure BDA0001115456670000122
Representing a correlation value to be obtained after the current filtering;
Figure BDA0001115456670000123
representing a correlation value obtained after the last filtering;
Corrn: representing a currently obtained relevance real-time value;
α: and the filter coefficient is represented, and the value range is [0,1 ]. 1 denotes no filtering. The default value may be 1/16, which may be dynamically adjusted according to the channel environment.
The scheduling information module 320 acquires scheduling information of a plurality of terminals. In this embodiment, the scheduling information of the terminal includes, but is not limited to, BLER, CQI, SINR, BSR, and the like.
The space division terminal group module 330 divides the plurality of terminals into one or more space division terminal groups according to the channel correlations of the plurality of terminals and the scheduling information of the plurality of terminals. In the embodiment, the channel correlation between different space division terminal groups is low; in this embodiment, in scheduling, according to channel correlation between different UEs, UE information participating in scheduling, and BSR/SINR/CQI of a UE to be scheduled, UEs that can be spatially divided and spatial-divided UEs to be screened are determined to be grouped according to parameters of the UEs, such as BSR/SINR/CQI. In this embodiment, the obtained null UE packets are divided according to the channel correlation, and the channel correlation between them is low, so that the null UE packets are suitable for null scheduling.
The scheduling parameter module 340 calculates scheduling parameters of multiple space division terminal groups in the current scheduling according to one or more space division terminal groups and scheduling information of terminals therein. In this embodiment, the scheduling parameters include, but are not limited to, MCS.
The scheduling module 350 calculates the number of the space division terminal groups actually used for space division scheduling and the number of the terminals actually used for space division scheduling according to the space division time-frequency resources and the scheduling parameters of one or more space division terminal groups, selects the corresponding terminals, and allocates the time-frequency resources for scheduling.
One embodiment of the present invention provides a time-frequency resource space division scheduling apparatus, including:
the channel correlation module 310 calculates channel correlations for a plurality of terminals. In this embodiment, channel correlation values for different UEs are calculated and maintained. Preferably, the real-time channel correlation values may be further processed to avoid excessive jitter in the correlation values.
The space division terminal group module 320 divides a space division selectable terminal set from a plurality of terminals according to the channel correlation and the channel priority of the plurality of terminals. In the embodiment, the space division optional user set S is maintained according to the correlation between the UE and the UEselectThe method specifically comprises the following steps:
from the active subscriber set SacitveDetermining a spatial selectable user set Sselect. Let a total of m users in the set of active users. During initialization, the space division is enabled to select a user set SselectS1 may be derived from S1acitveAccording to the user with the highest priority. After the scheduling is started, users which are suitable for space division except S1 in the active set are added into Sselect is; while not being at SacitveThe user in (1), needs to go from SselectDeleting; in scheduling, S isacitveAnd SselectThe UE in the set is sorted according to the scheduling priority; UE (user Equipment)1，UE2，...，UEn(n.ltoreq.m), proceeding from the sequence in order from high to low; and (6) traversing. Sequentially processing COR according to the sequence of traversing i first and then ji，j(1≤i＜n，1＜j≤n)，CORi，jIndicating the channel correlation between UEi and UEj. If there is CORi，j＜ThrCORIt means that the channels of UEi and UEj are not related. Thr (Thr)CORThe threshold is determined for channel correlation and may be derived from simulation or external field actual verification. After i and j traverse, obtaining a new space division optional user set UE1′，UE2′，...，UEn′(n' ≦ m), the ranking order of the UEs in the set is sorted according to the channel correlation of the UEs and the scheduling priorities of the UEs, with the user with the lowest channel correlation and the highest scheduling priority ranked first.
The scheduling information module 330 obtains scheduling information of a plurality of terminals. Specifically, the method may include:
the SINR module 331 is mainly configured to process the SINR value of the UE, and includes receiving the real-time SINR value and performing a smoothing filtering process on the real-time SINR value, where the filtering algorithm refers to formula 1. The filter coefficient alpha can be obtained according to simulation and actual test;
the CQI module 332 is mainly configured to process the CQI value reported by the UE, including receiving a real-time CQI value and performing smooth filtering on the real-time CQI value, where a filtering algorithm refers to formula 1.
The BLER module 333 is mainly configured to process the BLER values of the UE, including the real BLER values and perform the smoothing filtering on the real BLER values, where the filtering algorithm refers to formula 1.
The BSR module 334 is mainly used to receive and maintain the BSR of the UE. Except for the BSR module, the other modules provide the values after smooth filtering for the space division terminal group module. The BSR module provides real-time BSR values without filtering, as shown in fig. 4.
The space division terminal group module 320 divides the terminals in the space division selectable terminal set into one or more space division terminal groups according to the corresponding scheduling information division method. Based on the foregoing, in the present embodiment, the selectable user set S is selected according to the current space divisionSelect＝[UE1′，UE2′，...，UEn′And determining the grouping of the space division UE according to the SINR value, CQI value, BSR value and the scheduled MCS initial value of each UE (n' is less than or equal to m). The method specifically comprises the following steps:
sorting the terminals in the space optional terminal set according to the channel correlation and the channel priority of the plurality of terminals; and acquiring the terminals according to the sequence of the terminals in the space division selectable terminal set, and dividing the space division terminal group containing the acquired terminals according to the channel correlation and scheduling information of the acquired terminals and other terminals. In this embodiment, preferably, the UE may be ranked by comprehensively considering the correlation coefficient value and the channel priority of the UE in the scheduling, and the UE with low correlation and high channel priority is ranked in front. And then according to the UE sequence table, according to the sequence of the UE, simultaneously referring to the BSR, SINR and CQI of the UE, and performing space division UE grouping. The grouping aims to divide the UEs with similar BSR, SINR and CQI into the same empty group as much as possible under the condition that the channel correlation is lower than the dynamic threshold in the UE sequence table. The grouping result is maintained in the form of a space division UE grouping table and a space division UE scheduling information table.
An example of the result of the null processing is described below, where null UE packets are stored in a null UE packet table; suppose a UE of the first null packet in the null packet tableG1_1(ii) a The following table gives the space division UEG1_1The scheduling information of (2) is specifically as follows:
Figure BDA0001115456670000141
Figure BDA0001115456670000151
the above table takes ms (millisecond) as a time unit, and stores UEG1_1Including but not limited to the UE associated with each scheduling instantG1_1Correlation information of (1), SINR, CQI, BLER, and BSR information. The time range subscripts x1, x2, … … xn, which consecutively record n times of UEsG1_1The scheduling information, x1, x2, … … xn, corresponds to the frame number and subframe number of the system scheduling one by one, the size of n is set to meet the scheduling time length of new transmission and retransmission, and the reference setting value of n can be 20 according to the current downlink and uplink HARQ time sequence and the maximum retransmission times.
The scheduling parameter module 340 calculates an initial value of the number of space division streams of the current scheduling according to one or more space division terminal groups and scheduling information of the terminals therein. In this embodiment, according to the null UE packet table and the null UE scheduling information table, the null UE packet and the scheduling parameter of each null UE packet are determined, and a null UE packet scheduling parameter table is formed, as specifically shown in fig. 5. In this embodiment, the processing result "null UE packet table" in the previous step is used as the input of this stage; and using the processing result 'space division UE scheduling information table' of the previous step as the input of the stage; and determining the number m of the null UE packets scheduled this time and the number n of the UE of each null packet according to the null UE packet table and the null UE information table. And determining the initial value of the number of the space division streams by m and n.
Figure BDA0001115456670000152
X represents the sum of the number of all null UEs in the m null packets. And the initial value M of the number of the space division streams of the scheduling is min { X, X }. x represents the maximum number of spatial streams supported by the system, and this value is determined after the system design is determined. In the embodiment, space division is carried out according to the determined space division UE group informationAnd (4) preprocessing the flow to obtain an initial value M of the number of the air separation flow. The processing method can determine the number of streams and space division UE which can be space divided in the scheduling according to the space division capacity of the system and the space division UE information group information.
And the scheduling parameter module 340 estimates the influence caused by inter-stream interference according to the initial value of the number of the space division streams. In this embodiment, the influence of inter-stream interference on data reception is estimated based on the initial value M of the number of spatial streams. For a set of UEs participating in spatial division UE1，UE2，......UEMTo UEiAt the UEjIt appears to be an interfering signal. Inter-stream interference can drive up channel noise. The interference effects of different streams can be obtained by channel simulation.
The following table is a table of gain attenuation values for inter-stream interference. The attenuation of the gain brought about in the case of different air streams is shown.
Number of streams Gain attenuation (dB)
2 -3
3 Δ2
4 Δ3
…
x Δx
In the following CQI space division Compensation gain Table, CijRepresenting a UEmAnd UEnWhen performing space division between the UEsmHas a CQI value of i, UEnThe CQI value of (d) is the space division gain compensation value at j. When the UE ismAnd UEnWhen the combination of CQI values falls in the blank position of the following table, the UE is not advised at this timemAnd UEnSpace division is performed, and since space division is forced at this time, the transmission rate of the UE of the high-order CQI is greatly decreased, and the transmission efficiency is rather decreased.
Figure BDA0001115456670000161
Figure BDA0001115456670000171
And the scheduling parameter module 340 calculates scheduling parameters of a plurality of space division terminal groups according to the estimation result. In this embodiment, the scheduling parameters for each null UE group are determined based on the estimation of the impact of inter-stream interference. The determination of the MCS for the null packet is processed according to equation 2 below.
MCSGn＝MCSAMC+ΔM+Cij+BFGain(formula 2)
MCSGnMCS, MCS for scheduling of Gn-th null packetAMCIndicates MCS, Delta, obtained by AMC (adaptive modulation and coding) processMDenotes the gain attenuation of the inter-stream interference (subscript M denotes the number of spatial streams), C, obtained by looking up the gain attenuation value table of the inter-stream interferenceijIndicating the CQI space division compensating gain, BF, obtained by looking up the CQI space division compensating gain tableGainThe antenna gain is indicated.
Through the processing of the embodiment, the UE group UE which can be subjected to space division is preliminarily determinedG1、UEG2、……UEGMAnd simultaneously preliminarily determines the MCS of each space division UE packet schedulingG1、MCSG2、……MCSGMAnd determining a space division UE packet scheduling parameter table. In this embodiment, for the spatial division UE, SDMA multi-stream transmission is performed on the same frequency point and the same time-frequency resource, which may cause serious inter-stream interference. Under the condition of space division, in order to reduce the influence of inter-stream interference and ensure the analysis performance of the traffic channel, one method that can be adopted is to reduce the MCS (Modulation and Coding Scheme) according to the CQI and SINR so that the analysis accuracy of the traffic channel is kept within a proper range.
The scheduling module 350 calculates the number of the space division terminal groups actually used for space division scheduling and the number of the terminals actually used for space division scheduling according to the space division time-frequency resources and the scheduling parameters of one or more space division terminal groups, selects the corresponding terminals, and allocates the time-frequency resources for scheduling. In this embodiment, the obtained space division UE packet scheduling parameter table is obtained; acquiring frequency division UE scheduling information and available time-frequency resources; and scheduling the space division UE and the frequency division UE in a unified manner according to the space division UE group parameter information, the frequency division UE scheduling information, the available time-frequency resources and the power compensation. And determining the UE group and the frequency division UE which can actually carry out space division scheduling. After processing by this embodiment, for MCSGnLess than MCSthresholdThe space division UE group preferably adopts frequency division scheduling, so that the condition that the data receiving result is too poor due to forced space division is avoided. MCS (modulation and coding scheme)thresholdThe threshold is the lowest MCS threshold currently available for spatial division, and a spatial UE packet below this threshold is not suitable for spatial division scheduling. MCS (modulation and coding scheme)thresholdAnd according to the channel environment of the current space packet UE participating in scheduling, carrying out dynamic adjustment and implementing scheduling.
In the present embodiment, the outline of the above process is as follows: determining total time frequency resources which can be used by the scheduling, wherein the total time frequency resources comprise space division time frequency resources and frequency division time frequency resources; allocating time-frequency resources according to the UE information of space division and frequency division; meanwhile, according to the space division UE group information and the space division UE scheduling information, in combination with power compensation, available scheduling parameters including but not limited to MCS of each space division packet are determined. In the processing process, if the influence of inter-stream interference on the receiving performance is not enough to overcome after parameters such as MCS and the like are adjusted, the number of streams for space division needs to be reduced, even the number of streams for space division is reduced to no space division; recording scheduling information of the UE scheduled at this time, including but not limited to space division information and scheduling information of the UE; and carrying out scheduling.
Further, the plurality of terminals in this embodiment include a terminal that performs a retransmission operation, and the number of retransmissions is less than a preset threshold. In this embodiment, if a receiving end does not successfully receive a TB (Transport Block) transmitted in a space division manner and needs to retransmit the TB, the space division transmission manner may still be used to improve the spectrum efficiency of cell transmission as much as possible. If the TB of a certain UE is continuously transmitted in a space division mode for N times and still fails, the transmission mode of the UE is recommended to be returned to frequency division scheduling, and the value taking recommendation of the times N is not less than 2. For retransmission, the present embodiment also gives the following description:
for retransmission, the adaptive retransmission downlink data transmission and uplink data transmission are consistent in the space division scheduling processing mode of retransmission and new transmission; for non-adaptive retransmission uplink data transmission, because the size of the retransmitted TB (Transport Block) needs to be consistent with the size of the newly transmitted TB Block, the following three ways can be adopted:
(1) whether a single UE or a plurality of UEs need to be retransmitted, the retransmission is carried out by adopting a frequency division scheduling mode, so that the processing is simplified;
(2) if a plurality of UEs needing retransmission just belong to the same null packet corresponding to the newly transmitted time of the retransmission, and the retransmission of the UE is still suitable for space division after space division judgment, null packet selection, inter-stream interference, power compensation and scheduling parameter configuration, the plurality of UEs needing retransmission can carry out space division retransmission;
(3) if a plurality of UE needing retransmission do not belong to the same empty packet corresponding to the newly transmitted time of the retransmission, and the scheduling parameters including MCS, RB resources and the like in the newly transmitted scheduling have large difference, frequency division scheduling is recommended; or adopting space division scheduling judgment, adopting a best-effort space division scheduling mode, and adopting space division scheduling if the space division scheduling is available; otherwise, frequency division scheduling is adopted.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Those skilled in the art can implement the invention in various modifications, such as features from one embodiment can be used in another embodiment to yield yet a further embodiment, without departing from the scope and spirit of the invention. Any modification, equivalent replacement and improvement made within the technical idea of using the present invention should be within the scope of the right of the present invention.

Claims (10)

1. A time-frequency resource space division scheduling method is characterized by comprising the following steps:
calculating channel correlation of a plurality of terminals;
acquiring scheduling information of the plurality of terminals;
dividing the plurality of terminals into one or a plurality of space division terminal groups according to the channel correlation of the plurality of terminals and the scheduling information of the plurality of terminals;
calculating scheduling parameters of the one or more space division terminal groups according to the scheduling information of the terminals in the one or more space division terminal groups;
according to the scheduling parameters of the one or more space division terminal groups, determining the space division terminal group from the one or more space division terminal groups for space division scheduling, wherein the method comprises the following steps:
determining the space division terminal group with the scheduling parameter higher than a second preset threshold value in the one or more space division terminal groups as a space division terminal group to be scheduled;
the scheduling parameters include a Modulation and Coding Strategy (MCS), and the MCS is calculated according to the following formula: MCS (modulation and coding scheme)Gn＝MCSAMC+ΔM+Cij+BFGain；
MCSGnMCS, MCS for scheduling of Gn-th null packetAMCIndicates the MCS, Δ, obtained by the AMC adaptive modulation and coding processMDenotes the gain attenuation of the inter-stream interference obtained by looking up the gain attenuation value table of the inter-stream interference, the subscript M denotes the number of space division streams, CijIndicating CQI space compensationCQI space division compensation gain, BF, obtained from gain compensation tableGainThe antenna gain is indicated.
2. The method of claim 1, wherein calculating the scheduling parameters of the one or more space division terminal groups in the current scheduling according to the plurality of space division terminal groups and the scheduling information of the terminals comprises:
determining the number of terminals in the one or more space division terminal groups;
calculating the initial value of the number of the space division streams scheduled at this time according to the scheduling information of the terminals in the one or more space division terminal groups and the number of the terminals;
estimating the influence generated by the inter-flow interference according to the initial value of the number of the space division flows;
and calculating the scheduling parameters of the one or more space division terminal groups according to the estimation result.
3. The method according to claim 1 or 2, wherein the grouping the plurality of terminals into one or more space division terminal groups according to the channel correlations of the plurality of terminals and the scheduling information of the plurality of terminals specifically comprises:
and dividing the UEs with the channel correlation lower than a preset threshold and the similar scheduling information in the plurality of terminals into the same space division terminal group to form the one or more space division terminal groups.
4. The method according to claim 1 or 2, wherein the grouping the plurality of terminals into one or more space division terminal groups according to the channel correlations of the plurality of terminals and the scheduling information of the plurality of terminals specifically comprises:
dividing a space division selectable terminal set from the plurality of terminals;
and dividing the UEs with the similar scheduling information into the same space division terminal group in the space division selectable terminal set, wherein the channel correlation is lower than a first preset threshold value, so as to form the one or more space division terminal groups.
5. The method of claim 4, wherein partitioning the set of spatially selectable terminals from the plurality of terminals comprises:
sequencing the plurality of terminals according to the channel correlation and the scheduling priority of the plurality of terminals;
and dividing the space division selectable terminal set according to the sorting result.
6. A time frequency resource space division scheduling device is characterized by comprising:
a channel correlation module for calculating channel correlations of a plurality of terminals;
the scheduling information module is used for acquiring scheduling information of the plurality of terminals;
a space division terminal grouping module, configured to group the multiple terminals into one or more space division terminal groups according to the channel correlations of the multiple terminals and the scheduling information of the multiple terminals;
a scheduling parameter module, configured to calculate scheduling parameters of the one or more space division terminal groups according to scheduling information of terminals in the one or more space division terminal groups;
the scheduling module is used for determining the space division terminal group from the one or more space division terminal groups to be used for space division scheduling according to the scheduling parameters of the one or more space division terminal groups; the determining, according to the scheduling parameter of the one or more space division terminal groups, a space division terminal group from the one or more space division terminal groups for space division scheduling includes: determining the space division terminal group with the scheduling parameter higher than a second preset threshold value in the one or more space division terminal groups as a space division terminal group to be scheduled; the scheduling parameters include a Modulation and Coding Strategy (MCS), and the MCS is calculated according to the following formula: MCS (modulation and coding scheme)Gn＝MCSAMC+ΔM+Cij+BFGain；
MCSGnMCS, MCS for scheduling of Gn-th null packetAMCIndicates the MCS, Δ, obtained by the AMC adaptive modulation and coding processMThe gain attenuation value table representing the interference between the streams is obtainedThe subscript M denotes the number of null streams, CijIndicating the CQI space division compensating gain, BF, obtained by looking up the CQI space division compensating gain tableGainThe antenna gain is indicated.
7. The apparatus of claim 6,
the scheduling parameter module is used for determining the number of terminals in the one or more space division terminal groups; calculating the initial value of the number of the space division streams scheduled this time according to the one or more space division terminal groups, the scheduling information of the terminals and the number of the terminals; estimating the influence generated by the inter-flow interference according to the initial value of the number of the space division flows; and calculating the scheduling parameters of the one or more space division terminal groups according to the estimation result.
8. The apparatus according to claim 6 or 7,
a space division terminal grouping module, configured to group the multiple terminals into one or more space division terminal groups according to the channel correlations of the multiple terminals and the scheduling information of the multiple terminals, including:
and dividing the UEs with the channel correlation lower than a preset threshold and the similar scheduling information in the plurality of terminals into the same space division terminal group to form the one or more space division terminal groups.
9. The apparatus according to claim 6 or 7,
a space division terminal grouping module, configured to group the multiple terminals into one or more space division terminal groups according to the channel correlations of the multiple terminals and the scheduling information of the multiple terminals, further including:
dividing a space division selectable terminal set from the plurality of terminals;
and dividing the UEs with the similar scheduling information into the same space division terminal group in the space division selectable terminal set, wherein the channel correlation is lower than a first preset threshold value, so as to form the one or more space division terminal groups.
10. The apparatus of claim 9, wherein partitioning the set of spatially selectable terminals from the plurality of terminals comprises:
sequencing the plurality of terminals according to the channel correlation and the scheduling priority of the plurality of terminals;
and dividing the space division selectable terminal set according to the sorting result.
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