WO2018050059A1

WO2018050059A1 - Time-frequency resource space-division scheduling method and apparatus

Info

Publication number: WO2018050059A1
Application number: PCT/CN2017/101501
Authority: WO
Inventors: 王小锋
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-09-18
Filing date: 2017-09-13
Publication date: 2018-03-22
Also published as: CN107846266B; CN107846266A

Abstract

The present disclosure relates to a time-frequency resource space-division scheduling method and apparatus. The method comprises: calculating the channel correlations of a plurality of terminals; acquiring scheduling information of the plurality of terminals; dividing the plurality of terminals into one or more space-division terminal groups according to the channel correlations of same and the scheduling information thereof; calculating scheduling parameters of the plurality of space-division terminal groups in a current scheduling according to the one or more space-division terminal groups and the scheduling information of the terminals therein; and calculating, according to a time-frequency resource for space division and the scheduling parameters of the one or more space-division terminal groups, the number of space-division terminal groups actually used for space-division scheduling and the number of terminals actually used for space-division scheduling therein, then selecting the corresponding terminals and allocating time-frequency resources for scheduling. The technical solutions of the present disclosure are suitable for space-division scheduling, thereby fully optimizing same, increasing channel capacity and improving the efficiency of time-frequency resource scheduling.

Description

Time-frequency resource space division scheduling method and device

Technical field

The present disclosure relates to the field of wireless communications, and in particular, to a time-frequency resource space division scheduling method and apparatus.

Background technique

MIMO (Multiple Input Multiple Output) technology is the core technology of LTE (Long Term Evolution) system. It uses multiple transmit antennas and multiple receive antennas at the transmitting end and the receiving end respectively. The transmission and reception of the antenna doubles the system channel capacity without increasing the time-frequency resources.

Because of the importance of MIMO technology, starting from the Rel-8 version of the LTE protocol, eight downlink transmission modes have been proposed, and MIMO and SDMA (Spatial Division Multiple Access) technologies have been introduced. 3GPP (3rd Generation Partnership Project) continues to support higher-order SDMA capabilities by updating the LTE protocol, thereby increasing system channel capacity. 3GPP proposes FD-MIMO (Full-Dimension MIMO) in the Rel-13 protocol that has been standardized but not yet frozen, with the help of large-scale antenna array technology (using 64, 128, 256 or even more antenna elements) , reduce interference, improve signal to noise ratio, improve signal transmission and reception performance.) To achieve higher-order space division multiplexing capability.

The FD-MIMO system supports 64, 128, 256 or even more antenna elements. As the number of antenna elements increases, the system channel capacity can be increased to many times that of existing antenna systems. The emergence of high-order SDMA brings new challenges to the scheduling of wireless communication systems. At this stage, the scheduling method and resource allocation method for 2-stream and 4-stream space-division capabilities cannot meet the requirements of high-order SDMA. The main challenges are reflected in the following four aspects:

First, time-frequency resource allocation: For the 2-stream, 4-stream SDMA scheduling method, the traffic gain brought by air separation is limited, so the resource allocation method with priority frequency division is generally adopted. However, under the condition of higher-order SDMA capability, if the resource scheduling method with priority frequency division is still adopted, the SDMA capability of the system cannot be fully utilized, which will cause waste of time-frequency resources.

Second, inter-stream interference: Higher-order SDMA systems are more prone to stronger inter-stream interference than lower-order SDMA systems. In the case of stronger inter-stream interference, how to determine the scheduling parameters and overcome the inter-stream interference is a problem that needs to be solved in high-order SDMA scheduling.

3. Multi-user and multi-service types: In the commercial network environment, the user types and service types are rich and varied, ranging from large business package users to small business package users; both real-time services and non-real-time services. How to make full use of the advantages of space division and multi-stream technology, and schedule various types of services with different packet sizes and different packet delays to improve spectrum efficiency.

4. Processing of the scheduling process and the scheduling parameters: if the scheduling parameters are continued under the condition of low-order SDMA technology, including but not limited to BLER (Block Error Ratio), CQI (Channel Quality Indicator), Processing such as SINR (Signal to Interference plus Noise Ratio) and BSR (Buffer Status Report) is not appropriate. For example, the space division multiplexing of the downlink service, and the UE (User Equipment, terminal, user equipment) participating in the space division scheduling need to allocate power, in each In the case where the UE can obtain lower power, how to determine the scheduled MCS (modulation and coding strategy) according to SINR and CQI is different in the higher order SDMA technology.

The above four points raise four major key issues and are issues that need to be addressed to improve system channel capacity using higher order SDMA techniques.

Summary of the invention

In view of this, an object of the present disclosure is to provide a method and apparatus for time-frequency resource space division scheduling to improve channel capacity and implement efficient scheduling of time-frequency resources.

The technical solution adopted by the present disclosure to solve the above technical problems is as follows:

According to an aspect of the present disclosure, a time-frequency resource space division scheduling method includes: calculating channel correlation of a plurality of terminals; acquiring scheduling information of the plurality of terminals; and channel correlation according to the plurality of terminals And the scheduling information of the multiple terminals, the multiple terminals are divided into one or more air separation terminal groups; and the current scheduling is calculated according to the one or more air separation terminal groups and the scheduling information of the terminals therein The scheduling parameters of the plurality of air separation terminal groups; calculating the air separation terminal group actually used for space division scheduling according to the time-frequency resources of the space division and the scheduling parameters of the one or more air separation terminal groups For the number of terminals scheduled for space division, select the corresponding terminal and allocate time-frequency resources for scheduling.

According to another aspect of the present disclosure, a time-frequency resource space division scheduling apparatus includes: a channel correlation module, configured to calculate channel correlation of a plurality of terminals; and a scheduling information module, configured to acquire the multiple terminals Scheduling information; a space division terminal group module, configured to divide the plurality of terminals into one or more air separation terminal groups according to channel correlation of the plurality of terminals and scheduling information of the multiple terminals; scheduling a parameter module, configured to calculate scheduling parameters of the plurality of air separation terminal groups in the current scheduling according to the one or more air separation terminal groups and scheduling information of the terminal therein; and a scheduling module, configured to use the air separation time The frequency resource and the scheduling parameters of the one or more air separation terminal groups, calculate the space division terminal group actually used for space division scheduling, and the number of terminals actually used for space division scheduling, select the corresponding terminal, and allocate time-frequency resources to Schedule.

According to the above technical solution, it can be seen that the time-frequency resource space division scheduling method and apparatus of the present disclosure have at least the following advantages:

In the technical solution of the present disclosure, the terminal is divided into a plurality of air separation terminal groups according to channel correlation of the terminal, and channel correlation between the plurality of air separation terminal groups is low, suitable for space division scheduling; and according to the terminal The scheduling information determines the scheduling parameters used in the scheduling, so that the space division scheduling can be successfully completed; the technical solution of the present disclosure is suitable for space division scheduling, thereby fully utilizing the capability of space division scheduling, which is beneficial to improving channel capacity and increasing time frequency. The efficiency of resource scheduling.

DRAWINGS

FIG. 1 is a flowchart of a time-frequency resource space division scheduling method according to an embodiment of the present disclosure;

2 is a flowchart of a time-frequency resource space division scheduling method according to an embodiment of the present disclosure;

3 is a block diagram of a time-frequency resource space division scheduling apparatus according to an embodiment of the present disclosure;

4 is a schematic diagram of a time-frequency resource space division scheduling apparatus according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a time-frequency resource space division scheduling apparatus according to an embodiment of the present disclosure.

The implementation, functional features, and advantages of the present disclosure will be described with reference to the accompanying drawings.

detailed description

The present disclosure will be described in detail below with reference to the accompanying drawings and embodiments. It is understood that the exemplary embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.

As shown in FIG. 1 , an embodiment of the present disclosure provides a time-frequency resource space division scheduling method, including:

Step S110, calculating channel correlation of a plurality of terminals. In this embodiment, channel correlation between different UEs is processed, including reception of channel correlation between different UEs. For a TDD (Time Division Duplexing) system, channel correlation between terminals can be calculated by detecting pilots transmitted by different terminals; for FDD (Frequency Division Duplex) system, terminals detect downlink channels. The RS (Reference Signal) signal is used to calculate the channel information, and the obtained channel information is reported to the base station, and the base station performs channel correlation calculation and judgment according to the channel information reported by the UE.

Channel Correlation Smoothing Between UEs: Based on the time-varying and instability of the radio channel in a large-scale fading channel environment, the received channel correlation needs to be smoothed and filtered.

Represents the correlation value to be obtained after the current filtering;

Represents the correlation value obtained after the last filtering;

Corr _n : indicates the correlation real-time value currently obtained;

α: indicates the filter coefficient, which ranges from [0, 1]. 1 means no filtering. It can be dynamically adjusted according to the channel environment. The default value can be taken as 1/16.

Step S120: Acquire scheduling information of multiple 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, dividing the plurality of terminals into one or more air separation terminal groups according to channel correlation of the plurality of terminals and scheduling information of the plurality of terminals. In this embodiment, the channel correlation between different space-division terminal groups is low; in this embodiment, according to channel correlation between different UEs, UE information participating in scheduling, and BSR of the UE to be scheduled in scheduling The information such as the /SINR/CQI determines the UE that can be space-divided and groups the filtered space-division UE according to parameters such as the BSR/SINR/CQI of the UE. In this embodiment, since the obtained space-division UE group is divided according to channel correlation, and the channel correlation between them is low, it is suitable for space division scheduling.

Step S140: Calculate scheduling parameters of multiple air separation terminal groups in the current scheduling according to one or more air separation terminal groups and scheduling information of the terminal therein. In this embodiment, the scheduling parameters include, but are not limited to, an MCS.

Step S150: Calculate the space division terminal group actually used for space division scheduling and the number of terminals actually used for space division scheduling according to the time-frequency resource of the space division and the scheduling parameters of the one or more air separation terminal groups, and select the corresponding terminal. And allocate time-frequency resources for scheduling.

As shown in FIG. 2, an embodiment of the present disclosure provides a time-frequency resource space division scheduling method, including:

Step S210, calculating channel correlation of a plurality of terminals. In this embodiment, channel correlation values of different UEs are calculated and maintained. Preferably, real-time channel correlation values can be processed to avoid excessive correlation jitter.

Step S220, dividing a set of space-selectable terminals from the plurality of terminals according to channel correlation and channel priority of the plurality of terminals. In this embodiment, according to the correlation between the UEs, the air separation optional user set S _{select is} maintained, and the exemplary includes:

The space-selectable user set S _select is determined from the active user set S _acitve . Let there be a total of m users in the active user collection. At initialization, the space-selectable user set S _select ={s1}, s1 can be selected from the S _acitve according to the user with the highest priority. After starting the scheduling, users who are suitable for air points other than S1 in the active set are added to the S _select ; users who are not in the _Sacitve need to be deleted from the S _select ; in the scheduling, the S _acitve and the S _select are in the set. The UEs are sorted according to the scheduling priority; UE ₁ , UE ₂ , . . . , UE _n (n≤m) are performed in order from highest to lowest in the sequence; traversal processing. COR _i,j (1≤i<n,1<j≤n) is sequentially processed according to the order of traversing i first and then traversing j, and COR _i,j represents the channel correlation between UEi and UEj. If there is COR _i,j <Thr _COR , it means that the channel of UEi and UEj is independent. Thr _COR is the threshold for channel correlation judgment and can be obtained from simulation or field verification. After the i and j traversal is completed, a new space-division selectable user set UE _1' , UE _2' , ..., UE _n' ( _n' ≤ m) is obtained, and the order of the UEs in the set is according to the UE The channel correlation and the scheduling priority of the UE are sorted, and the users with the lowest channel correlation and the highest scheduling priority are ranked first.

Step S230, acquiring scheduling information of multiple terminals. Illustratively, it may include:

The SINR value of each UE in the S _acitve queue is received and maintained to support scheduling. Preferably, the real-time SINR value can be processed to avoid excessive SINR jitter;

Receive and maintain the CQI value of each UE in the S _acitve queue. Preferably, the real-time CQI value can be processed to avoid excessive CQI jitter;

Receive and maintain the BLER value of each UE in the S _acitve queue. Preferably, the real-time BLER of each UE can be processed to avoid excessive BLER jitter;

Receive and maintain the BSR value of each UE in the S _acitve queue. When the number of scheduled users is too small, for a UE with a small BSR, delay scheduling can also be considered, which increases the traffic of a single scheduling and improves the air separation performance.

Step S240: The terminal in the space-selectable terminal set is one or more air-divided terminal groups according to the corresponding scheduling information division method. Based on the foregoing, in this embodiment, according to the current space division, the SINR value of each UE in the user set S _select =[UE _1′ , UE _2′ , . . . , UE _n′ (n′≤m), The CQI value, the BSR value, and the scheduled MCS initial value determine the packet for performing the space division UE. Examples include:

Sorting the terminals in the space-selectable terminal set according to the channel correlation and the channel priority of the multiple terminals; acquiring the terminal according to the order of the terminals in the space-selectable terminal set, and according to the channel of the acquired terminal and other terminals Sex and scheduling information, including the air separation terminal group where the acquired terminal is located. In this embodiment, preferably, in the scheduling, the UE may be sorted by considering the correlation coefficient value and the channel priority of the UE, and the foregoing is a UE with low correlation and high channel priority. Then, according to the UE sequence table, the space division UE grouping is performed according to the BSR, the SINR, and the CQI of the UE in the order of the UE. The purpose of the packet is to divide the UEs with similar BSR, SINR and CQI into the same null packet in the UE sequence table, when the channel correlation is lower than the dynamic threshold. The result of the grouping is maintained in the form of a space division UE group table and a space division UE scheduling information table.

An example of the result of the space division processing is described below. The space division UE group is stored in the space division UE group table; assuming the UEG1_1 of the first null packet in the null packet table; the following table shows the scheduling of the space division UEG1_1 The information is illustrative as follows:

The above table stores the information of each scheduling moment in a continuous scheduling time of the UE _{G1_1} in ms (milliseconds), including but not limited to the correlation information, SINR of the UE _{G1_1} associated with each scheduling moment. CQI, BLER and BSR information. The time range subscripts x1, x2, ... xn continuously record n times of UE _{G1_1} scheduling information, x1, x2, ... xn, and the system-scheduled frame number and subframe number correspond one-to-one, and the size of n is set to The length of the new transmission and retransmission scheduling is satisfied. According to the current downlink and uplink HARQ timing and the maximum number of retransmissions, the reference setting value of n may be 20.

Step S250: Calculate an initial value of the number of spatial division streams of the current scheduling according to one or more air separation terminal groups and scheduling information of the terminal therein. In this embodiment, according to the space division UE group table and the space division UE scheduling information table, the scheduling parameters of the space division UE group and each space division UE group are determined, and the space division UE group scheduling parameter table is formed. In this embodiment, the processing result of the previous step is "the space division UE group table" as the input of the current stage; and the processing result of the previous step "the space division UE scheduling information table" is used as the input of this stage; The UE group table and the space division UE information table are divided, and the number of space-division UE groups m of the current scheduling and the number n of UEs of each null packet are determined. The initial value of the number of air-divided flows is determined by m and n.

X represents the sum of the number of all space-division UEs in m null packets. The initial value of the number of space divisions in this scheduling is M=min{X, x}. x represents the maximum number of air-splitting streams supported by the system, which is determined after the system design is determined. In this embodiment, the space division pre-processing is performed according to the determined space-division UE group information, and the initial value M of the air-divided stream number is obtained. The processing method can determine the number of streams that can be spatially divided and the number of space-division UEs according to the capability of the system space division and the space-divided UE information group information.

Step S260, estimating the influence of the inter-stream interference according to the initial value of the number of air-divided streams. In this embodiment, the impact of inter-stream interference on data reception is estimated based on the initial value M of the air-divided stream number. Involved in air separation for the UE set _{_{{UE 1, UE 2, ...}} , UE M}, the data signal of the UE _I, the UE is the interference signal _J opinion. Inter-stream interference can increase channel noise. The interference effects of different streams can be obtained through channel simulation.

The following table is a table of gain attenuation values for inter-stream interference. It shows the attenuation of the gain caused by different air splits.

流数Number of streams	增益衰减(dB)Gain attenuation (dB)
22	-3-3
33	Δ₂ Δ ₂
44	Δ₃ Δ ₃
…...
xx	Δ_x Δ _x

In the following CQI space division compensation gain table, C _ij represents the space division gain between the UE _m and the UE _n when the CQI value of the UE _m is i and the CQI value of the UE _n is j. value. When the combination of the CQI values of the UE _m and the UE _n falls in the blank position in the following table, it is not recommended that the UE _m and the UE _n perform the space division. Because the air separation is forced at this time, the transmission rate of the UE of the high-order CQI decreases greatly. On the contrary, it will reduce the transmission efficiency.

	11	22	33	44	55	66	77	88	99	1010	1111	1212	1313	1414	1515
11	C₁₁ C ₁₁	C₁₂ C ₁₂	C₁₃ C ₁₃	C₁₄ C ₁₄	C₁₅ C ₁₅	C₁₆ C ₁₆
22	C₂₁ C ₂₁	C₂₂ C ₂₂	C₂₃ C ₂₃	C₂₄ C ₂₄	C₂₅ C ₂₅	C₂₆ C ₂₆
33	C₃₁ C ₃₁	C₃₂ C ₃₂	C₃₃ C ₃₃	C₃₄ C ₃₄	C₃₅ C ₃₅	C₃₆ C ₃₆
44	C₄₁ C ₄₁	C₄₂ C ₄₂	C₄₃ C ₄₃	C₄₄ C ₄₄	C₄₅ C ₄₅	C₄₆ C ₄₆
55	C₅₁ C ₅₁	C₅₂ C ₅₂	C₅₃ C ₅₃	C₅₄ C ₅₄	C₅₅ C ₅₅	C₅₆ C ₅₆
66	C₆₁ C ₆₁	C₆₂ C ₆₂	C₆₃ C ₆₃	C₆₄ C ₆₄	C₆₅ C ₆₅	C₆₆ C ₆₆
77							C₇₇ C ₇₇	C₇₈ C ₇₈	C₇₉ C ₇₉
88							C₈₇ C ₈₇	C₈₈ C ₈₈	C₈₉ C ₈₉
99							C₉₇ C ₉₇	C₉₈ C ₉₈	C₉₉ C ₉₉
1010										C_aa C _aa	C_ab C _ab	C_ac C _ac	C_ad C _ad	C_ae C _ae	C_af C _af
1111										C_ba C _ba	C_bb C _bb	C_bc C _bc	C_bd C _bd	C_be C _be	C_bf C _bf
1212										C_ca C _ca	C_cb C _cb	C_cc C _cc	C_cd C _cd	C_ce C _ce	C_cf C _cf

1313	C_da C _da	C_db C _db	C_dc C _dc	C_dd C _dd	C_de C _de	C_df C _df
1414	C_ea C _ea	C_eb C _eb	C_ec C _ec	C_ed C _ed	C_ee C _ee	C_ef C _ef
1515	C_fa C _fa	C_fb C _fb	C_fc C _fc	C_fd C _fd	C_fe C _fe	C_ff C _ff

Step S270, calculating scheduling parameters of the plurality of air separation terminal groups according to the estimation result. In this embodiment, the scheduling parameters of each space-division UE group are determined according to the impact estimation of the inter-stream interference. The determination of the MCS of the null packet is processed according to Equation 2 below.

MCS _Gn -MCS _AMC +Δ _M +C _ij +BF _Gain (Equation 2)

MCS _Gn represents the MCS for scheduling the Gn empty packets, MCS _AMC represents the MCS obtained by the AMC (Adaptive Modulation and Coding) process, and Δ _M represents the inter-stream interference obtained by checking the gain attenuation table of the inter-stream interference. The gain attenuation (subscript M indicates the number of space divisions), C _ij represents the CQI space division compensation gain obtained by checking the CQI space division compensation gain table, and BF _Gain represents the antenna gain.

Through the processing of this embodiment, the UE groups UE _G1 , UE _G2 , ... UE _GM that can be spatially separated are initially determined, and the MCS _G1 , MCS _G2 , ... MCS _GM scheduled by each space-division UE group are also initially determined. The space division UE group scheduling parameter table is determined. In this embodiment, for a space division UE, performing SDMA multi-stream transmission on the same frequency point and the same time-frequency resource 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 resolution of the service channel, one method that can be adopted is to reduce the MCS (Modulation and Coding Scheme) according to CQI and SINR. The resolution accuracy of the traffic channel is kept within an appropriate range.

Step S280: Calculate the space division terminal group actually used for space division scheduling and the number of terminals actually used for space division scheduling according to the time-frequency resource of the space division and the scheduling parameters of one or more air separation terminal groups, and select the corresponding terminal. And allocate time-frequency resources for scheduling. In this embodiment, the previously obtained space division UE group scheduling parameter table is obtained; and the frequency division UE scheduling information and available time-frequency resources are acquired; the air separation UE group scheduling parameter, the frequency division UE scheduling information, and the available time frequency are obtained according to the space division UE group scheduling parameter. Resources and power compensation, unified scheduling of space and frequency division UEs. A UE group and a frequency division UE that can actually perform space division scheduling are determined. After the processing in this embodiment, for the space-division UE group whose MCS _{Gn is} smaller than the MCS _threshold , frequency division scheduling is preferably adopted to avoid the situation that the data reception result is too poor due to forced air separation. The MCS _threshold is the lowest MCS _threshold currently available for space division. The air separation UE group below this threshold is not suitable for space division scheduling. The MCS _threshold is dynamically adjusted according to the channel environment of the null packet UE currently participating in scheduling, and scheduling is implemented.

In this embodiment, the process is summarized as follows: determining the total time-frequency resources that can be used in the current scheduling, including the time-frequency resources of the space division and the time-frequency resources of the frequency division; and the UE information according to the space division and the frequency division, Allocate time-frequency resources. At the same time, according to the space division UE group information and the space division UE scheduling information, combined with the power compensation, the scheduling parameters available for each null packet are determined, including but not limited to the MCS. In the process of processing, if the parameters such as the MCS are not enough to overcome the impact of the inter-stream interference on the receiving performance, the number of the air-divided streams needs to be reduced, or even reduced to no-space; the scheduling information of the UE scheduled this time is recorded. Includes, but is not limited to, space division information and scheduling information of the UE; scheduling is performed.

The multiple terminals in this embodiment include the terminal that performs the retransmission operation, and the number of retransmissions is less than a preset threshold. In this In the embodiment, if the TB (Transport Block) transmitted by the space division method is not successfully received by the receiving end and needs to be retransmitted, the space division transmission mode can still be adopted to improve the spectrum efficiency of the cell transmission as much as possible. If the TB of a certain UE is continuously transmitted in the N-space mode, the transmission mode of the UE is recommended to be rolled back to the frequency division scheduling. The value of the number of times N is recommended to be no less than 2. For retransmission, the following description is also given in this embodiment:

For retransmission, the downlink data transmission and the uplink data transmission of the adaptive retransmission are the same as the space division scheduling processing of the retransmission and the new transmission; the non-adaptive retransmission uplink data transmission is because the retransmitted TB (Transport Block) The size of the new TB block needs to be the same. Therefore, for the non-adaptive retransmission of the uplink data transmission, the following three methods can be used:

(1) Whether a single UE or multiple UEs need to be retransmitted, the frequency division scheduling method is used for retransmission, which simplifies processing;

(2) If multiple UEs that need to be retransmitted, the new transmission time corresponding to this retransmission happens to belong to the same null packet, and the retransmission of the UE is retransmitted, and the space division judgment, the null packet selection selection, and the flow are performed. After the inter-interference, power compensation, and scheduling parameters are configured, it is still suitable for space division. Then, multiple UEs that need to be retransmitted this time can perform space division retransmission;

(3) If multiple UEs that need to be retransmitted, the new transmission time corresponding to this retransmission does not belong to the same null packet, and the scheduling parameters of the new transmission scheduling, including MCS and RB resources, are greatly different. Frequency division scheduling; space division scheduling judgment can also be adopted, and best-effort space allocation scheduling mode is adopted. If space division scheduling is possible, space division scheduling is adopted; otherwise, frequency division scheduling is adopted.

As shown in FIG. 3, an embodiment of the present disclosure provides a time-frequency resource space division scheduling apparatus, including:

The channel correlation module 310 calculates channel correlations of the plurality of terminals. In this embodiment, channel correlation between different UEs is processed, including reception of channel correlation between different UEs. For a TDD (Time Division Duplexing) system, channel correlation between terminals can be calculated by detecting pilots transmitted by different terminals. For FDD (Frequency Division Duplex) systems, terminals detect downlink channel RSs (Reference Signal). And a pilot signal, the channel information is calculated, and the acquired channel information is used to calculate the channel correlation according to the channel information reported by the UE.

Represents the correlation value to be obtained after the current filtering;

Represents the correlation value obtained after the last filtering;

Corr _n : indicates the correlation real-time value currently obtained;

α: indicates the filter coefficient, which ranges from [0, 1]. 1 means no filtering. Can be dynamically adjusted according to the channel environment The default value can be taken as 1/16.

The scheduling information module 320 acquires scheduling information of multiple terminals. In this embodiment, the scheduling information of the terminal includes but is not limited to BLER, CQI, SINR, BSR, and the like.

The air separation terminal group module 330 divides the plurality of terminals into one or more air separation terminal groups according to channel correlation of the plurality of terminals and scheduling information of the plurality of terminals. In this embodiment, the channel correlation between different space-division terminal groups is low; in this embodiment, according to channel correlation between different UEs, UE information participating in scheduling, and BSR of the UE to be scheduled in scheduling The information such as the /SINR/CQI determines the UE that can be space-divided and groups the filtered space-division UE according to parameters such as the BSR/SINR/CQI of the UE. In this embodiment, since the obtained space-division UE group is divided according to channel correlation, and the channel correlation between them is low, it is suitable for space division scheduling.

The scheduling parameter module 340 calculates scheduling parameters of the plurality of air separation terminal groups in the current scheduling according to the one or more air separation terminal groups and the scheduling information of the terminal therein. In this embodiment, the scheduling parameters include, but are not limited to, an MCS.

The scheduling module 350 calculates the space division terminal group actually used for space division scheduling and the number of terminals actually used for space division scheduling according to the time-frequency resource of the space division and the scheduling parameters of the one or more space division terminal groups, and selects corresponding The terminal allocates time-frequency resources for scheduling.

An embodiment of the invention provides a time-frequency resource space division scheduling apparatus, including:

The channel correlation modulo 310 calculates the channel correlation of the plurality of terminals. In this embodiment, channel correlation values of different UEs are calculated and maintained. Preferably, real-time channel correlation values can be processed to avoid excessive correlation jitter.

The air separation terminal group module 320 divides the air separation optional terminal set from the plurality of terminals according to channel correlation and channel priority of the plurality of terminals. In this embodiment, according to the correlation between the UEs, the air separation optional user set S _{select is} maintained, and the exemplary includes:

The scheduling information module 330 acquires scheduling information of multiple terminals. Illustratively, it may include:

The SINR module 331 is configured to process the SINR value of the UE, including receiving the real-time SINR value and smoothing the real-time SINR. The filtering algorithm refers to Equation 1. The filter coefficient ^α 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 the real-time CQI value and performing smoothing filtering on the real-time CQI value, and the filtering algorithm refers to Equation 1.

The BLER module 333 is mainly configured to process the BLER value of the UE, including the real-time BLER value and perform smoothing filtering on the real-time BLER value, and the filtering algorithm refers to Equation 1.

The BSR module 334 is mainly used to receive and maintain the BSR value of the UE. Except for the BSR module, the remaining modules provide the values after smoothing filtering for the space division terminal group module. The BSR module provides unfiltered real-time BSR values, as shown in Figure 4.

The air separation terminal group module 320, for the terminals in the space division optional terminal set, is one or more air separation terminal groups according to the corresponding scheduling information division method. Based on the foregoing, in this embodiment, according to the current space division, the SINR value of each UE in the user set S _select =[UE _1′ , UE _2′ , . . . , UE _n′ (n′≤m), The CQI value, the BSR value, and the scheduled MCS initial value determine the packet for performing the space division UE. Examples include:

The scheduling parameter module 340 calculates an initial value of the number of spatial division streams of the current scheduling according to one or more air separation terminal groups and scheduling information of the terminal therein. In this embodiment, according to the space division UE group table and the space division UE scheduling information table, the scheduling parameters of the space division UE group and each space division UE group are determined, and a space division UE group scheduling parameter table is formed, as shown in FIG. 5 . Shown. In this embodiment, the processing result of the previous step is "the space division UE group table" as the input of the current stage; and the processing result of the previous step "the space division UE scheduling information table" is used as the input of this stage; The UE group table and the space division UE information table are divided, and the number of space-division UE groups m of the current scheduling and the number n of UEs of each null packet are determined. The initial value of the number of air-divided flows is determined by m and n.

The scheduling parameter module 340 estimates the impact of inter-stream interference based on the initial value of the number of air-divided flows. In this embodiment, the impact of inter-stream interference on data reception is estimated based on the initial value M of the air-divided stream number. Involved in air separation for the UE set _{_{{UE 1, UE 2, ...}} , UE M}, the data signal of the UE _I, the UE is the interference signal _J opinion. Inter-stream interference can increase channel noise. The interference effects of different streams can be obtained through channel simulation.

	11	22	33	44	55	66	77	88	99	1010	1111	1212	1313	1414	1515
11	C₁₁ C ₁₁	C₁₂ C ₁₂	C₁₃ C ₁₃	C₁₄ C ₁₄	C₁₅ C ₁₅	C₁₆ C ₁₆
22	C₂₁ C ₂₁	C₂₂ C ₂₂	C₂₃ C ₂₃	C₂₄ C ₂₄	C₂₅ C ₂₅	C₂₆ C ₂₆
33	C₃₁ C ₃₁	C₃₂ C ₃₂	C₃₃ C ₃₃	C₃₄ C ₃₄	C₃₅ C ₃₅	C₃₆ C ₃₆
44	C₄₁ C ₄₁	C₄₂ C ₄₂	C₄₃ C ₄₃	C₄₄ C ₄₄	C₄₅ C ₄₅	C₄₆ C ₄₆
55	C₅₁ C ₅₁	C₅₂ C ₅₂	C₅₃ C ₅₃	C₅₄ C ₅₄	C₅₅ C ₅₅	C₅₆ C ₅₆
66	C₆₁ C ₆₁	C₆₂ C ₆₂	C₆₃ C ₆₃	C₆₄ C ₆₄	C₆₅ C ₆₅	C₆₆ C ₆₆
77							C₇₇ C ₇₇	C₇₈ C ₇₈	C₇₉ C ₇₉
88							C₈₇ C ₈₇	C₈₈ C ₈₈	C₈₉ C ₈₉
99							C₉₇ C ₉₇	C₉₈ C ₉₈	C₉₉ C ₉₉
1010										C_aa C _aa	C_ab C _ab	C_ac C _ac	C_ad C _ad	C_ae C _ae	C_af C _af
1111										C_ba C _ba	C_bb C _bb	C_bc C _bc	C_bd C _bd	C_be C _be	C_bf C _bf
1212										C_ca C _ca	C_cb C _cb	C_cc C _cc	C_cd C _cd	C_ce C _ce	C_cf C _cf
1313										C_da C _da	C_db C _db	C_dc C _dc	C_dd C _dd	C_de C _de	C_df C _df
1414										C_ea C _ea	C_eb C _eb	C_ec C _ec	C_ed C _ed	C_ee C _ee	C_ef C _ef
1515										C_fa C _fa	C_fb C _fb	C_fc C _fc	C_fd C _fd	C_fe C _fe	C_ff C _ff

The scheduling parameter module 340 calculates scheduling parameters of the plurality of air separation terminal groups according to the estimation result. In this embodiment, the scheduling parameters of each space-division UE group are determined according to the impact estimation of the inter-stream interference. The determination of the MCS of the null packet is processed according to Equation 2 below.

MCS _Gn =MCS _AMC +Δ _M +C _ij +BF _Gain (Equation 2)

The scheduling module 350 calculates the space division terminal group actually used for space division scheduling and the number of terminals actually used for space division scheduling according to the time-frequency resource of the space division and the scheduling parameters of the one or more space division terminal groups, and selects corresponding The terminal allocates time-frequency resources for scheduling. In this embodiment, obtaining the previously obtained space division UE group scheduling parameter table; and acquiring frequency division UE scheduling information and available time frequency resources; according to the space division UE group parameter information, frequency division UE scheduling information, and available time frequency Resources and power compensation, unified scheduling of space and frequency division UEs. A UE group and a frequency division UE that can actually perform space division scheduling are determined. After the processing in this embodiment, for the space-division UE group whose MCS _{Gn is} smaller than the MCS _threshold , frequency division scheduling is preferably adopted to avoid the situation that the data reception result is too poor due to forced air separation. The MCS _threshold is the lowest MCS _threshold currently available for space division. The air separation UE group below this threshold is not suitable for space division scheduling. The MCS _threshold is dynamically adjusted according to the channel environment of the null packet UE currently participating in scheduling, and scheduling is implemented.

The multiple terminals in this embodiment include the terminal that performs the retransmission operation, and the number of retransmissions is less than a preset threshold. In this embodiment, if the TB (Transport Block) transmitted by the space division method is not successfully received by the receiving end and needs to be retransmitted, the space division transmission mode can still be adopted to improve the spectrum efficiency of the cell transmission as much as possible. . If the TB of a certain UE is continuously transmitted in the N-space mode, the transmission mode of the UE is recommended to be rolled back to the frequency division scheduling. The value of the number of times N is recommended to be no less than 2. For retransmission, the following description is also given in this embodiment:

The preferred embodiments of the present disclosure have been described above with reference to the drawings, and are not intended to limit the scope of the disclosure. Field The present invention may be implemented in a variety of variations without departing from the scope and spirit of the present disclosure. For example, the features of one embodiment may be used in another embodiment to obtain a further embodiment. Any modifications, equivalent substitutions and improvements made within the technical concept of the present disclosure are intended to be included within the scope of the present disclosure.

Claims

A time-frequency resource space division scheduling method, comprising:

Calculating channel correlation of multiple terminals;

Obtaining scheduling information of the multiple terminals;

And dividing the multiple terminals into one or more air separation terminal groups according to channel correlation of the multiple terminals and scheduling information of the multiple terminals;

Calculating scheduling parameters of the plurality of air separation terminal groups in the current scheduling according to the one or more air separation terminal groups and scheduling information of the terminal therein;

Calculating the space division terminal group actually used for space division scheduling and the number of terminals actually used for space division scheduling according to the time-frequency resource of the space division and the scheduling parameters of the one or more space division terminal groups, and selecting the corresponding terminal and Time-frequency resources are allocated for scheduling.
The method according to claim 1, wherein the scheduling parameters of the one or more air separation terminal groups in the current scheduling are calculated according to the plurality of air separation terminal groups and the scheduling information of the terminal, including:

Calculating an initial value of the number of spatial division streams of the current scheduling according to the one or more air separation terminal groups and the scheduling information of the terminal therein;

Estimating the impact of inter-stream interference based on the initial value of the number of air-divided flows;

According to the estimation result, the scheduling parameters of the plurality of air separation terminal groups are calculated.
The method according to claim 1, wherein the dividing the plurality of terminals into one or more air separation terminal groups according to channel correlation of the plurality of terminals and scheduling information of the plurality of terminals comprises:

Demarcating a set of space-selectable terminals from the plurality of terminals according to channel correlation and channel priority of the plurality of terminals;

The terminal in the space-selectable terminal set is the one or more air-divided terminal groups according to a corresponding scheduling information division method.
The method according to claim 3, wherein the terminal in the space-selectable terminal set is the one or more air-divided terminal groups according to a corresponding scheduling information division method, including:

Sorting the terminals in the space-selectable terminal set according to channel correlation and channel priority of the multiple terminals;

And obtaining, according to the channel correlation and scheduling information of the acquired terminal and the other terminal, the air-divided terminal group including the acquired terminal.
The method according to any one of claims 1 to 4, wherein

The terminal includes a terminal that performs a retransmission operation, and the number of retransmissions is less than a preset threshold.
A time-frequency resource space division scheduling device, comprising:

a channel correlation module, configured to calculate channel correlation of multiple terminals;

a scheduling information module, configured to acquire scheduling information of the multiple terminals;

a space division terminal group module, configured to perform channel correlation according to the plurality of terminals and a scheduling letter of the plurality of terminals Dividing the plurality of terminals into one or more air separation terminal groups;

a scheduling parameter module, configured to calculate scheduling parameters of the plurality of air separation terminal groups in the current scheduling according to the one or more air separation terminal groups and scheduling information of the terminal therein;

And a scheduling module, configured to calculate, according to the time-frequency resource of the space division and the scheduling parameter of the one or more air separation terminal groups, the space division terminal group that is actually set to the space division scheduling, and the number of terminals that are actually set to the space division scheduling , select the corresponding terminal and allocate time-frequency resources for scheduling.
The apparatus according to claim 6, wherein

The scheduling parameter module calculates an initial value of the air-splitting flow number of the current scheduling according to the one or more space-division terminal groups and the scheduling information of the terminal therein, and estimates the inter-stream interference generated according to the initial value of the air-divided flow number. Affecting, and calculating scheduling parameters of the plurality of air separation terminal groups according to the estimation result.
The apparatus according to claim 6, wherein

The space division terminal group module divides a space division selectable terminal set from the plurality of terminals according to channel correlation and channel priority of the multiple terminals, and selects a terminal in the space division selectable terminal set According to the corresponding scheduling information division method, the one or more air separation terminal groups.
The device according to claim 8, wherein

The space division terminal group module sorts terminals in the space division selectable terminal set according to channel correlation and channel priority of the plurality of terminals, and sorts terminals in the terminal set according to the space division. The terminal is obtained, and the air separation terminal group including the acquired terminal is divided according to channel correlation and scheduling information of the acquired terminal and other terminals.
The apparatus according to any one of claims 6 to 9, wherein

The terminal includes a terminal that performs a retransmission operation, and the number of retransmissions is less than a preset threshold.