CN113765551A

CN113765551A - Terminal pairing method and base station in MU-MIMO

Info

Publication number: CN113765551A
Application number: CN202010493987.0A
Authority: CN
Inventors: 周娇; 何文林; 黄庆; 陈卓
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2021-12-07
Anticipated expiration: 2040-06-03
Also published as: CN113765551B

Abstract

The invention provides a terminal pairing method and a base station in MU-MIMO, belonging to the technical field of wireless communication, wherein the method comprises the following steps: grouping the plurality of terminals according to the sequence of the signal change information when the plurality of terminals pass through the transceiving points of the base station in sequence; pairing a first grouping and a second grouping in the obtained groupings; for the terminals in the first group, selecting the terminals in the second group for pairing; the first grouping and the second grouping are at least separated by M groups, and M is a preset value and is a positive integer. The invention can reduce the pairing difficulty of MU-MIMO, improve the pairing precision, reduce the pairing time delay and the cost, thereby improving the MU-MIMO performance. The method is particularly suitable for high-speed scenes of high-speed trains or special coverage scenes such as subways.

Description

Terminal pairing method and base station in MU-MIMO

Technical Field

The invention relates to the technical field of wireless communication, in particular to a terminal pairing method and a base station in MU-MIMO.

Background

In order to improve the overall performance of the network in the existing network, Multi-User Multiple-Input-Multiple-Output (MU-MIMO) is adopted to realize Multi-User spatial multiplexing. In the existing MU-MIMO, a terminal reports a Precoding Matrix Indicator (PMI) or a Sounding Reference Signal (SRS) for uplink Channel Sounding to estimate a Channel environment of each user in a cell, then pairing detection is performed for every 2-4 users in a polling manner, and a user with the highest matching index (for example, the Channel Quality Indicator (CQI) after matching) is selected to adopt MU-MIMO, so as to improve cell performance (for example, cell average throughput).

The existing implementation method needs all users in a cell to pair every two users through a pairing algorithm, so that the calculated amount is extremely large, and the time delay is long.

Disclosure of Invention

In view of the above, the present invention provides a terminal pairing method and a base station in MU-MIMO, which are used for solving the problems that all users in a cell need to pair every two users through a pairing algorithm, the calculation amount is extremely large, and the time delay is long in the current terminal pairing method in MU-MIMO.

In order to solve the above technical problem, in a first aspect, the present invention provides a method for pairing terminals in MU-MIMO, which is applied to a base station, and includes:

grouping the plurality of terminals according to the sequence of the signal change information when the plurality of terminals pass through the transceiving points of the base station in sequence;

pairing a first grouping and a second grouping in the obtained groupings;

for the terminals in the first group, selecting the terminals in the second group for pairing;

the first grouping and the second grouping are at least separated by M groups, and M is a preset value and is a positive integer.

Optionally, the signal change information is: change information that the reference signal receiving power starts to become smaller after gradually increasing, or change information that the frequency offset is reversed from negative bias to positive bias.

Optionally, the step of grouping the plurality of terminals according to the signal change information when the plurality of terminals sequentially pass through the transceiving points of the base station according to the passing order includes:

grouping according to the number of the terminals, counting the terminals passing through the transmitting and receiving points, taking every N terminals as one group, wherein N is a positive integer; or,

grouping the terminals according to the time when the terminals pass through the transmitting and receiving points, wherein the terminals passing through the transmitting and receiving points in each T time period are used as one group, and T is larger than zero; or,

and grouping the terminals according to the number of the terminals and the time of the terminals passing through the transmitting and receiving points.

Optionally, the step of grouping the terminals according to the number of the terminals and the time when the terminals pass through the transceiving points includes:

if the number of the terminals passing through the receiving and sending points in the T time period is less than N, taking the terminals passing through the receiving and sending points in the T time period as a group, and restarting timing and counting;

and if the number of the terminals passing through the transmitting and receiving points is N and the time from the start of counting is less than T time, taking the N terminals as a group, and restarting timing and counting.

Optionally, the step of selecting the terminals in the second grouping for pairing with respect to the terminals in the first grouping includes:

selecting a terminal with the difference value between the reference signal received power in the second grouping and the target terminal being more than 3dB, and matching the terminal with the target terminal; or,

selecting the terminal with the difference value between the reference signal received power in the second grouping and the target terminal being more than 3dB and less than 10dB, and matching the terminal with the target terminal;

wherein the target terminal is the terminal within the first group.

Optionally, after the step of selecting the terminals in the second grouping for pairing with respect to the terminals in the first grouping, the method further includes:

communicating first information to a next base station, the first information comprising at least one of:

identification information of the terminal;

information of the group to which the terminal belongs;

pairing information of the group;

pairing information of the terminal;

and the next base station is an adjacent base station determined according to the moving direction of the terminal.

Optionally, the step of transferring the first information to the next base station includes:

the first information is transferred to the next base station through the terminal history information of the X2 interface.

Optionally, the terminal is a terminal in the same vehicle, and after the step of grouping the plurality of terminals according to the signal change information when the plurality of terminals sequentially pass through the transceiving points of the base station, the method further includes:

deleting the terminals of the group in-group get-off; and/or the presence of a gas in the gas,

adding a first terminal for getting on the bus within the group.

Optionally, the step of adding a first terminal for getting on the bus in the group includes:

and after judging that the first terminal passes through the transceiving point of the base station according to the signal change information of the first terminal, adding the first terminal into a group where a second terminal is located, wherein the second terminal is the terminal which passes through the transceiving point of the base station before the first terminal.

Optionally, the multiple terminals are grouped according to a passing order according to signal change information when the multiple terminals sequentially pass through the transceiving points of the base station; pairing a first grouping and a second grouping in the obtained groupings; for the terminals in the first group, selecting the terminals in the second group for pairing comprises:

if the pairing update triggering condition is met, grouping the plurality of terminals according to the passing sequence according to the signal change information when the plurality of terminals sequentially pass through the receiving and sending points of the base station; pairing a first grouping and a second grouping in the obtained groupings; for the terminals in the first group, selecting the terminals in the second group for pairing.

Optionally, the pairing update triggering condition includes at least one of:

updating a cell;

the time from the last update has reached an update period;

and judging that the terminal passes through a new transceiving point of the base station.

In a second aspect, the present invention further provides a base station, including:

the grouping module is used for grouping the plurality of terminals according to the sequence of the signal change information when the plurality of terminals pass through the transceiving points of the base station in sequence;

the grouping pairing module is used for pairing a first grouping and a second grouping in the obtained groupings;

a terminal pairing module, configured to select, for the terminals in the first group, the terminals in the second group for pairing;

Optionally, the grouping module includes:

a first grouping unit, configured to group the terminals according to the number of the terminals, count the terminals that pass through the transceiving point, take every N terminals as one group, where N is a positive integer; or,

the second grouping unit is used for grouping the terminals according to the time when the terminals pass through the transmitting and receiving points, the terminals passing through the transmitting and receiving points in each T time period are used as one grouping, and T is larger than zero; or,

and the third grouping unit is used for grouping the terminals according to the number of the terminals and the time of the terminals passing through the receiving and sending points.

Optionally, the third grouping unit is configured to, if the number of the terminals that pass through the transceiving point in the T time period is less than N, take the terminal that passes through the transceiving point in the T time period as one grouping, and restart timing and counting; and if the number of the terminals passing through the transmitting and receiving points is N and the time from the start of counting is less than T time, taking the N terminals as a group, and restarting timing and counting.

Optionally, the terminal pairing module includes:

the first terminal pairing unit is used for selecting a terminal with the difference value between the reference signal received power in the second grouping and the target terminal being greater than 3dB, and pairing the terminal with the target terminal; or,

the second terminal pairing unit is used for selecting the terminal with the difference value between the reference signal received power in the second grouping and the target terminal being more than 3dB and less than 10dB, and pairing the terminal with the target terminal;

wherein the target terminal is the terminal within the first group.

Optionally, the base station further includes:

a sending module, configured to transmit first information to a next base station, where the first information includes at least one of the following information:

identification information of the terminal;

information of the group to which the terminal belongs;

pairing information of the group;

pairing information of the terminal;

Optionally, the sending module is configured to transmit the first information to a next base station through terminal history information of an X2 interface.

Optionally, the terminal is a terminal in the same vehicle, and the base station further includes:

the deleting module is used for deleting the terminals of the group in-group getting-off; and/or the presence of a gas in the gas,

and the adding module is used for adding the first terminal for getting on the bus in the group.

Optionally, the adding module includes:

and the adding unit is used for adding the first terminal into a group where a second terminal is located after the first terminal passes through the transceiving point of the base station according to the signal change information of the first terminal, wherein the second terminal is the terminal which passes through the transceiving point of the base station before the first terminal.

Optionally, the grouping module is configured to, if the pairing update triggering condition is met, group the multiple terminals according to a passing order according to signal change information when the multiple terminals sequentially pass through the transceiving points of the base station; the grouping pairing module is used for pairing a first grouping and a second grouping in the obtained groupings; the terminal pairing module is configured to select the terminals in the second packet for pairing with respect to the terminals in the first packet.

Optionally, the pairing update triggering condition includes at least one of:

updating a cell;

the time from the last update has reached an update period;

In a third aspect, the present invention further provides a base station, including: a transceiver and a processor;

the processor is used for grouping the plurality of terminals according to the sequence of the signal change information when the plurality of terminals pass through the transceiving points of the base station in sequence;

the processor is further configured to pair a first packet and a second packet of the obtained packets;

the processor further configured to select the terminals in the second packet for pairing with respect to the terminals in the first packet;

Optionally, the processor is configured to group the terminals according to the number of the terminals, count the terminals passing through the transceiving point, take every N terminals as one group, and N is a positive integer; or,

the processor is configured to group the terminals according to the time when the terminals pass through the transceiving points, the terminals passing through the transceiving points in each T time period serve as one group, and T is greater than zero; or,

and the processor is used for grouping the terminals according to the number of the terminals and the time of the terminals passing through the transmitting and receiving points.

Optionally, the processor is configured to, if the number of the terminals that pass through the transceiving point in the T time period is less than N, take the terminal that passes through the transceiving point in the T time period as one group, and restart timing and counting; and if the number of the terminals passing through the transmitting and receiving points is N and the time from the start of counting is less than T time, taking the N terminals as a group, and restarting timing and counting.

Optionally, the processor is configured to select a terminal whose difference between the reference signal received power in the second packet and the target terminal is greater than 3dB, and pair the terminal with the target terminal; or selecting the terminal with the difference value between the reference signal received power in the second grouping and the target terminal being more than 3dB and less than 10dB, and matching with the target terminal;

wherein the target terminal is the terminal within the first group.

Optionally, the transceiver is configured to transmit first information to a next base station, where the first information includes at least one of the following information:

identification information of the terminal;

information of the group to which the terminal belongs;

pairing information of the group;

pairing information of the terminal;

Optionally, the transceiver is configured to transmit the first information to a next base station through terminal history information of an X2 interface.

Optionally, the terminals are terminals in the same vehicle, and the processor is further configured to delete the terminal that gets off in a group; and/or adding a first terminal for getting on the bus within the group.

Optionally, the processor is further configured to add the first terminal into a group where a second terminal is located after the first terminal passes through the transceiving point of the base station according to the signal change information of the first terminal, where the second terminal is a terminal that passes through the transceiving point of the base station before the first terminal.

Optionally, the processor is configured to group the multiple terminals according to a passing order according to signal change information when the multiple terminals sequentially pass through the transceiving points of the base station if the pairing update triggering condition is met; pairing a first grouping and a second grouping in the obtained groupings; for the terminals in the first group, selecting the terminals in the second group for pairing.

Optionally, the pairing update triggering condition includes at least one of:

updating a cell;

the time from the last update has reached an update period;

In a fourth aspect, the present invention further provides a base station, including a memory, a processor, and a program stored in the memory and executable on the processor; the processor implements the steps of any of the above methods of terminal pairing in MU-MIMO when executing the program.

In a fifth aspect, the present invention also provides a readable storage medium, on which a program is stored, which when executed by a processor, implements the steps in any of the above-described MU-MIMO terminal pairing methods.

The technical scheme of the invention has the following beneficial effects:

the embodiment of the invention can reduce the pairing difficulty of MU-MIMO, improve the pairing precision, reduce the pairing time delay and the pairing cost, thereby improving the MU-MIMO performance. The method is particularly suitable for high-speed scenes of high-speed trains or special coverage scenes such as subways.

Drawings

Fig. 1 is a flowchart illustrating a method for pairing terminals in MU-MIMO according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a base station in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another base station in the embodiment of the present invention;

fig. 4 is a schematic structural diagram of another base station in the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

Aiming at the problems that every two users in a cell need to be paired pairwise through a pairing algorithm, the calculation amount is large, and the time delay is long in the current terminal pairing method in MU-MIMO, in the existing improvement scheme, through terminal SRS report or synchronous Signal Block and/or physical broadcast channel Block (Synchronization Signal and PBCH Block, SSB, namely SS/PBCH Block, including PSS (primary Synchronization Signal), SSS (secondary Synchronization Signal) and PBCH (physical broadcast channel), also called synchronous Signal/broadcast channel Block) report, the region where the terminal is located is distinguished according to the beam where the terminal is located, and the terminal in different regions adopts the pairing algorithm to realize pairwise pairing. The method is applicable to the common environment of large-scale antennas, and has the advantages of slow terminal channel change and high regional precision. But in a high-speed rail scenario, the performance is poor. Firstly, the number of antennas of high-speed rail equipment is small, the 8TR (transmitter and receiver) realizes 4 wave beams at maximum, the station spacing is 600 meters, each wave beam covers about 80 meters, about 4 carriages, and the high-speed rail of 8 carriages is divided into 2 areas at maximum. Meanwhile, the terminal has a high running speed, and the scheme is not suitable.

Referring to fig. 1, fig. 1 is a schematic flowchart of a terminal pairing method in MU-MIMO according to an embodiment of the present invention, where the method is applied to a base station, and includes the following steps:

step 11: grouping the plurality of terminals according to a passing order according to signal change information when the plurality of terminals sequentially pass through a Transmission/Reception Point (TRP) of the base station;

in the embodiment of the invention, all the groups obtained after grouping the terminals according to the sequence of the terminals passing through the transmitting and receiving points are also sequenced in sequence.

Step 12: pairing a first grouping and a second grouping in the obtained groupings;

step 13: for the terminals in the first group, selecting the terminals in the second group for pairing;

the first grouping and the second grouping are at least separated by M groups, and M is a preset value and is a positive integer. I.e. terminals within a group that differ by M groups can be paired directly.

Wherein the second packet may be one packet or a plurality of packets. For example, the first group may be a first group, the second group may be a fifth group, a sixth group, a seventh group, and an eighth group, and when it is necessary to pair one terminal in the first group, one terminal in the fifth group may be selected for pairing, one terminal in the sixth group may be selected for pairing, one terminal in the seventh group may be selected for pairing, and a terminal in the eighth group may be selected for pairing.

That is, in the embodiment of the present invention, the terminals transmit the MU data according to the group pair to which the terminals belong.

In the embodiment of the invention, the relative positions of the plurality of terminals are basically fixed. The terminal locations within different ones of the groups are different and adjacent to the terminal locations within the groups. For example, the terminals may be terminals located on the same subway or the same high-speed rail, and of course, the terminals may be terminals located on other large-scale vehicles besides the subway or the high-speed rail.

The terminal pairing method in the MU-MIMO provided by the embodiment of the invention can reduce the pairing difficulty of the MU-MIMO, improve the pairing precision, and reduce the pairing time delay and the cost, thereby improving the MU-MIMO performance. The method is particularly suitable for high-speed scenes of high-speed trains or special coverage scenes such as subways.

The following exemplifies the terminal pairing method in the MU-MIMO described above.

Optionally, the signal change information is: change information that the Reference Signal Received Power (RSRP) gradually becomes smaller after increasing, or change information that the frequency offset is reversed from negative to positive.

When the terminal passes through a transmitting and receiving point of the base station, the terminal is under the station, the path loss (PathLoss) is low, and the RSRP is high; when the terminal is positioned between the two transmitting and receiving points, PathLoss is higher, and RSRP is lower. That is, the RSRP of the terminal gradually gets higher from low as it gets closer to the transceiving point of the base station, then reaches the highest as it gets further from the transceiving point, and then again gets lower from high as it gets further from the transceiving point, similar to a sine wave. In addition, when the terminal gradually approaches a receiving and transmitting point of the base station, the frequency offset is negative and the offset absolute value gradually becomes smaller, then the time frequency offset is zero under the receiving and transmitting point, and then the frequency offset becomes positive and gradually increases as the terminal gradually moves away from the receiving and transmitting point. The frequency offset variation jitter is smaller with respect to the variation of RSRP. The change rule is particularly obvious in special scenes such as high-speed rail private networks. The terminal passes through the transceiving point of the base station, which may also be referred to as a pole.

In the embodiment of the present invention, the base station may determine whether the terminal passes through the transceiving point (i.e., whether the terminal passes through a pole) according to a change of RSRP of the terminal, and if the RSRP of a certain terminal changes from low to high and then changes from high to low after reaching a highest point, that is, the RSRP passes through an inflection point, the terminal passes through the transceiving point of the base station. Or judging whether the terminal passes through the transceiving point (i.e. whether the terminal passes through the pole) according to the frequency offset change of the terminal, if the frequency offset of one terminal is inverted from negative bias to positive bias, the terminal passes through the transceiving point of the base station.

For a high-speed rail private network scene, the environment of a high-speed rail compartment has a natural isolation environment, an isolation door is closed between every two compartments, 5 meters of toilet hand washing space is reserved between every two compartments, and each compartment is meshed. The interference of the terminal above 2 compartments at intervals is almost zero, the matching can be directly finished, and the correlation degree of the terminal does not need to be calculated by adopting a channel correlation algorithm. When grouping is carried out according to the number of the terminals, considering that 80-100 persons in each carriage and 7-8 persons become China mobile users, N can be configured to be 60, namely, the terminals passing through the transceiving points are counted, and one group is formed for each 60 terminals. If the seat-taking rate is high, 1-2 groups of carriages are arranged in one section, and when the seat-taking rate is low, about 2 carriages are arranged in one group. When the terminals are grouped according to the time when the terminals pass through the transceiving point, considering that the speed of a high-speed railway is generally 350 kilometers per hour, each carriage passes through a pole for about 250 milliseconds, so that T can be configured to be 200 milliseconds. M can be worth 4, and the interval is more than or equal to 4 groups, and the terminal interval is 2 ~ 3 carriages at least, satisfies the isolation requirement.

For a high-speed rail private network scenario, N may be configured to be 60 and T may be configured to be 200 milliseconds. Counting the number of terminals passing through a receiving and transmitting point of a base station, and if the number of the terminals passing through the receiving and transmitting point is 60 but is less than 200ms, taking the 60 terminals as a group, and restarting timing and counting; and if the number of the terminals passing through the transceiving point of the base station after 200ms is still less than 60, grouping the terminals passing through the transceiving point of the base station within the 200 ms.

In the embodiment of the invention, the carriage where the terminal is located can be simulated according to the number of the pole-crossing terminals and the pole-crossing time, and an accurate positioning technology is not needed.

In addition, for a high-speed rail scene, the environment of the high-speed rail carriage has a natural isolation environment, the isolation door is closed between every two carriages, 5 meters of toilet hand washing space is reserved between every two carriages, and each carriage is meshed. Therefore, in other alternative embodiments, the cars in which the terminal is located may be determined according to the signal change information when the terminal passes through the transceiving point of the base station, and the terminals in each car are in one group. The length of the high-speed rail is 8 or 16 carriages, M can be 4, namely, terminals of every 4 carriages which are more than or equal to M can be paired. If 8 carriages, the 1 st carriage is paired with the 5 th to 8 th carriages, the 2 nd carriage is paired with the 6 th to 8 th carriages, the 3 rd carriage is paired with the 7 th to 8 th carriages, and the 4 th carriage is paired with the 8 th carriage for 2 streams or 4 streams. E.g., 16 cars, then 1/5/9/13, 2/6/10/14, 3/7/11/15, 4/8/12/16 sets of terminals pair 4 streams. For 8 cars, it is suggested 1/5, 2/6, 3/7, 4/8 to group terminal pairings, which can optimize pairing performance and simplify pairing algorithms.

In the embodiment of the invention, when the terminals are paired, 2 terminals can be selected for pairing, and 4 terminals can also be selected for pairing, namely 2 streams or 4 streams are paired. Of course, other numbers of terminals may be selected for pairing, for example, 3 terminals may be paired, which is not limited herein. However, in the paired terminals, the groups to which any two terminals belong are separated by at least M groups.

wherein the target terminal is the terminal within the first group.

In the embodiment of the invention, the difference value of the RSRP values between the paired terminals is required to be larger than 3dB, so that the condition that the distance between the paired terminals cannot meet the requirement of isolation degree due to accidental movement of the terminals can be avoided, for example, the terminals are positioned in the same carriage due to accidental movement.

In addition, in order to meet the requirement that the MU-MIMO data transmission channels have certain isolation and are close to each other as much as possible, when the terminals are paired, the terminals with the RSRP value difference value larger than 3dB and smaller than 10dB can be selected for pairing.

That is, in the embodiment of the present invention, the pairing conditions are: two terminals transmit services simultaneously, the channel environment is close (the RSRP difference is less than 10dB) and the terminal position meets the isolation requirement (the grouping of the terminals at least have M differences and the RSRP difference is more than 3 dB).

In the embodiment of the invention, after grouping a plurality of terminals according to the passing order according to the signal change information when the plurality of terminals pass through the transceiving points of the base station in sequence, the base station marks the grouping identification (groupID) of the grouping to which the base station belongs to each terminal. For the high-speed rail private network scene, if the grouping is not carried out again, the grouping identifier marked by the base station for each terminal is not changed among different cells of the high-speed rail, and the terminal is reset after going out of the high-speed rail cell and entering a common large network cell.

the identification information of the terminal may specifically be a group identification and a terminal identification to which the terminal belongs;

the information of the group to which the terminal belongs specifically includes a group identifier (groupID) of the group to which the terminal belongs, and if the grouping is not performed again, the group identifier is applicable to the whole high-speed rail cell;

pairing information of the group;

the pairing information of the terminal may specifically include Cell-Radio Network Temporary Identifier (C-RNTI) information (also may be referred to as a terminal history pairing Identifier, or simply referred to as a pairing Identifier) of a current pairing terminal, where the pairing Identifier is applicable to a merging Cell (i.e., a Cell of one base station) of multiple transceiving points of one base station, and needs to be updated when the Cell is switched;

For special scenes such as high-speed rails and the like, the position of the terminal is relatively fixed, the terminal needs to be matched in real time unlike the large network, and the next base station pairing information can be notified after one-time matching, so that the pairing frequency can be reduced.

The information of the group to which the terminal belongs may be a mapping relationship between a group identifier of the group to which the terminal belongs and the C-RNTI information of the terminal, and when cell handover occurs, the target cell replaces an old C-RNTI in the terminal history information with a new C-RNTI, updates the mapping relationship between the group identifier and the C-RNTI, transmits the updated mapping relationship to the next cell, and sequentially updates the updated mapping relationship.

For the currently paired terminals, the pairing identifier may be marked, and the next transmission is preferentially paired.

In addition, if one terminal changes in the transmission process of the paired terminals, for example, no service transmission occurs, the other terminal is selected from the group to which the terminal belongs to pair with the other terminal.

That is, the terminal pairing mode in the embodiment of the present invention is a semi-static pairing mode, or a semi-fixed pairing mode, which not only can satisfy the pairing transmission requirement, but also can reduce the pairing frequency.

The C-RNTI information of the current pairing terminal is unchanged among different receiving and sending points of the same cell (base station) of the high-speed rail, and is updated after cell switching. The C-RNTI information of the current pairing terminal needs to be transmitted from the original cell to the target cell through the X2 interface by adopting a mapping relation together with the grouping identifier. After the cell switching is completed, the terminal history Information (UE history Information) carried by the terminal is associated to the C-RNTI Information of the new cell, and the same mapping relation and the original packet identifier are adopted to update the new mapping relation to the C-RNTI Information of the new cell.

Certainly, in the pairing information of the terminal, the terminal identifier of the current paired terminal may also be defined as a group identifier (groupID) + a terminal identifier (UEID), and the terminal identifier of the current paired terminal is the same as the group identifier, and if the terminal identifier of the current paired terminal is not grouped again, the terminal is unchanged between different high-speed rail cells, and is reset after the terminal exits the high-speed rail cell and enters the common large network cell.

In an optional specific embodiment, the first information may include: a set of at least one set of potential paired terminals (set a), and each set of potential paired terminals (set a) includes at least one terminal group (set B), each terminal group (set B) includes at least one terminal. In set a, different terminals in each terminal group (set B) are not suitable for MU pairing; terminals belonging to different terminal groups (set B) may attempt MU pairing. For example, if 2 terminals are not provided for each car and the terminals at 1 car are suitable for MU pairing, then

Set a1 ═ B1{1,2}, B2{5,6}, B3{9,10}

Set a2 ═ B4{3,4}, B5{7,8}, B6{11,12} }; where 1,2, and 3 … … denote terminals sorted in order of the transceiving points passing through the base station.

the first Information is transferred to the next base station through terminal history Information (UE history Information) of the X2 interface.

Wherein, the X2 interface is the interface between the base stations. Of course, the first information may be transmitted to the next base station in other manners.

In the embodiment of the invention, the history information of the terminal carries the history pairing terminal, particularly the latest C-RNTI information of the pairing terminal, and the prior pairing of the original terminal can be realized in the new cell according to the updating of the newly allocated C-RNTI information.

adding a first terminal for getting on the bus within the group.

Wherein the vehicle may be a large-scale vehicle such as a high-speed rail or a subway.

In the embodiment of the invention, under special scenes such as a high-speed rail private network, the grouping does not need to be updated in the high-speed rail driving process, namely, the grouping does not need to be carried out again, only the getting-on and getting-off terminals need to be updated, specifically, the getting-off terminals are reset according to the types of the cells, and the getting-on terminals mark the same grouping information according to the previous pole passing terminals.

Further optionally, the step of adding the first terminal for getting on the bus in the group includes:

That is, in the embodiment of the present invention, for a newly-picked terminal, the same grouping information may be marked according to the previous transit bar terminal without grouping again.

In the embodiment of the invention, for a high-speed rail scene, after a base station groups and pairs a plurality of terminals on a high-speed rail according to signal change information when the terminals pass through a first transceiving point of a high-speed rail private network base station when the high-speed rail exits from an originating station, the terminals do not need to be grouped again in the high-speed rail driving process, and only the terminals on/off the train need to be updated. However, grouping and pairing may also be performed again during high-speed rail driving, that is, grouping and pairing identifiers are updated, and specifically, grouping and pairing may be performed again when a pairing update trigger condition is satisfied. Of course, if the terminal is switched to a non-high-speed rail cell, the middle grouping identification and the pairing identification are reset.

Further optionally, the pairing update triggering condition includes at least one of:

updating a cell;

the time from the last update has reached an update period;

That is, in the embodiment of the present invention, grouping and pairing may be performed again when a cell is updated, that is, when a cell is handed over, grouping and pairing may also be updated periodically, and grouping and pairing may also be updated every time a transmitting/receiving point passes (that is, updating is performed after passing a pole).

When the cell update is used as the pairing update triggering condition, the pairing information is the same in the combined cell (i.e. the cell of one base station) formed by each transceiver point of one base station. When the cell update is used as the pairing update triggering condition, the grouping information of each terminal does not need to be transmitted and the pairing information of the terminals does not need to be transmitted in the whole high-speed rail.

For a high-speed rail scene, the minimum interval between two stations of a high-speed rail is 30 minutes, so that the requirements of users getting on or off the train are met, and therefore, the updating period can be set to be 30 minutes. Of course, the update period may be set to other time lengths, which is not limited herein.

In addition, the above-mentioned pairing update triggering conditions may be used in combination, for example, a combination of cell update and periodic update, and if the current time is already one update period away from the last update time, the grouping and pairing are updated if cell switching occurs.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a base station according to an embodiment of the present invention, where the base station 20 includes:

a grouping module 21, configured to group the multiple terminals according to a passing order according to signal change information when the multiple terminals sequentially pass through the transceiving points of the base station;

a group pairing module 22, configured to pair a first group and a second group in the obtained groups;

a terminal pairing module 23, configured to select, for the terminals in the first packet, the terminals in the second packet to pair;

Optionally, the grouping module 21 includes:

Optionally, the terminal pairing module 23 includes:

wherein the target terminal is the terminal within the first group.

Optionally, the base station further includes:

identification information of the terminal;

information of the group to which the terminal belongs;

pairing information of the group;

pairing information of the terminal;

Optionally, the adding module includes:

Optionally, the grouping module 21 is configured to, if the pairing update triggering condition is met, group the multiple terminals according to a passing order according to signal change information when the multiple terminals sequentially pass through the transceiving points of the base station; the group pairing module 22 is configured to pair a first group and a second group in the obtained groups; the terminal pairing module 23 is configured to select, for the terminals in the first packet, the terminals in the second packet to pair.

Optionally, the pairing update triggering condition includes at least one of:

updating a cell;

the time from the last update has reached an update period;

The embodiments of the present invention are product embodiments corresponding to the above method embodiments, and therefore, detailed description is omitted here, and refer to the above embodiments in detail.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a base station according to an embodiment of the present invention, where the base station 30 includes: a transceiver 31 and a processor 32;

the processor 32 is configured to group the plurality of terminals according to a passing order according to signal change information when the plurality of terminals sequentially pass through the transceiving points of the base station;

the processor 32 is further configured to pair a first packet and a second packet of the obtained packets;

the processor 32 is further configured to select the terminals in the second packet for pairing with respect to the terminals in the first packet;

Optionally, the processor 32 is configured to perform grouping according to the number of the terminals, count the terminals passing through the transceiving point, take every N terminals as one grouping, where N is a positive integer; or,

the processor 32 is configured to group the terminals according to the time when the terminals pass through the transceiving points, where the terminal passing through the transceiving points in each T time period is used as one group, and T is greater than zero; or,

the processor 32 is configured to group the terminals according to the number of the terminals and the time when the terminals pass through the transceiving points.

Optionally, the processor 32 is configured to, if the number of the terminals that pass through the transceiving point in the T time period is less than N, use the terminals that pass through the transceiving point in the T time period as one group, and restart timing and counting; and if the number of the terminals passing through the transmitting and receiving points is N and the time from the start of counting is less than T time, taking the N terminals as a group, and restarting timing and counting.

Optionally, the processor 32 is configured to select a terminal whose difference between the reference signal received power in the second packet and the target terminal is greater than 3dB, and pair the terminal with the target terminal; or selecting the terminal with the difference value between the reference signal received power in the second grouping and the target terminal being more than 3dB and less than 10dB, and matching with the target terminal;

wherein the target terminal is the terminal within the first group.

Optionally, the transceiver 31 is configured to communicate first information to a next base station, where the first information includes at least one of the following information:

identification information of the terminal;

information of the group to which the terminal belongs;

pairing information of the group;

pairing information of the terminal;

Optionally, the transceiver 31 is configured to transmit the first information to a next base station through terminal history information of an X2 interface.

Optionally, the terminals are terminals in the same vehicle, and the processor 32 is further configured to delete the terminal that gets off in the group; and/or adding a first terminal for getting on the bus within the group.

Optionally, the processor 32 is further configured to add the first terminal into a group where a second terminal is located after the first terminal passes through the transceiving point of the base station according to the signal change information of the first terminal, where the second terminal is the terminal that passes through the transceiving point of the base station before the first terminal.

Optionally, the processor 32 is configured to, if the pairing update triggering condition is met, group the multiple terminals according to a passing order according to signal change information when the multiple terminals sequentially pass through the transceiving points of the base station; pairing a first grouping and a second grouping in the obtained groupings; for the terminals in the first group, selecting the terminals in the second group for pairing.

Optionally, the pairing update triggering condition includes at least one of:

updating a cell;

the time from the last update has reached an update period;

Referring to fig. 4, fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention, where the base station 40 includes a processor 41, a memory 42, and a program stored in the memory 42 and capable of running on the processor 41; the processor 41 implements the following steps when executing the program:

pairing a first grouping and a second grouping in the obtained groupings;

Optionally, when the processor 41 executes the program, the following steps may be further implemented:

the step of grouping the plurality of terminals according to the signal change information when the plurality of terminals sequentially pass through the transceiving points of the base station according to the passing order includes:

the step of grouping the terminals according to the number of the terminals and the time of the terminals passing the transmitting and receiving points comprises the following steps:

the step of selecting the terminals in the second grouping for pairing to the terminals in the first grouping comprises:

wherein the target terminal is the terminal within the first group.

after the step of selecting the terminals in the second grouping for pairing with respect to the terminals in the first grouping, the method further includes:

identification information of the terminal;

information of the group to which the terminal belongs;

pairing information of the group;

pairing information of the terminal;

the step of passing the first information to the next base station comprises:

Optionally, the terminal is a terminal in the same vehicle, and the processor 41 may further implement the following steps when executing the program:

after the step of grouping the plurality of terminals according to the signal change information when the plurality of terminals sequentially pass through the transceiving points of the base station, the method further includes:

adding a first terminal for getting on the bus within the group.

the step of adding a first terminal for boarding within the group comprises:

grouping the plurality of terminals according to the passing order according to the signal change information when the plurality of terminals pass through the transceiving points of the base station in sequence; pairing a first grouping and a second grouping in the obtained groupings; for the terminals in the first group, selecting the terminals in the second group for pairing comprises:

Optionally, the pairing update triggering condition includes at least one of:

updating a cell;

the time from the last update has reached an update period;

The specific working process of the embodiment of the present invention is the same as that of the above method embodiment, and therefore, the detailed description thereof is omitted, and please refer to the description of the method steps in the above embodiment in detail.

An embodiment of the present invention provides a readable storage medium, on which a program is stored, where the program, when executed by a processor, implements the steps in the terminal pairing method in MU-MIMO according to any one of the above-mentioned embodiments. Please refer to the above description of the method steps in the corresponding embodiments.

The Base Station in the embodiment of the present invention may be a Base Transceiver Station (BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB, eNodeB) in LTE, a relay Station, an Access point, a Base Station in a future 5G network, and the like, which are not limited herein.

The terminal in the embodiments of the present invention may be a wireless terminal or a wired terminal, and the wireless terminal may be a device providing voice and/or other service data connectivity to a user, a handheld device having a wireless connection function, or other processing devices connected to a wireless modem. A wireless terminal, which may be a mobile terminal such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal, e.g., a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more core networks via a Radio Access Network (RAN), and may exchange language and/or data with the RAN. For example, devices such as Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs) are used. A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), and a Terminal (User Device or User Equipment), which are not limited herein.

Such readable storage media, including both permanent and non-permanent, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A terminal pairing method in MU-MIMO is applied to a base station, and is characterized by comprising the following steps:

pairing a first grouping and a second grouping in the obtained groupings;

2. The method of claim 1, wherein the signal change information is: change information that the reference signal receiving power starts to become smaller after gradually increasing, or change information that the frequency offset is reversed from negative bias to positive bias.

3. The method of claim 1, wherein the step of grouping the plurality of terminals in a passing order according to the signal change information when the plurality of terminals sequentially pass through the transceiving points of the base station comprises:

4. The method of claim 3, wherein the step of grouping the terminals according to the number of the terminals and the time of the terminals passing the transceiving point comprises:

5. The method of claim 1, wherein the step of selecting the terminals in the second group for pairing to the terminals in the first group comprises:

wherein the target terminal is the terminal within the first group.

6. The method of claim 1, wherein the step of selecting the terminals in the second group for pairing is further followed by, for the terminals in the first group:

identification information of the terminal;

information of the group to which the terminal belongs;

pairing information of the group;

pairing information of the terminal;

7. The method of claim 6, wherein the step of passing the first information to the next base station comprises:

8. The method according to claim 1 or 6, wherein the terminals are terminals in the same vehicle, and the method further comprises, after the step of grouping the plurality of terminals in a passing order according to the signal change information when the plurality of terminals pass through the transceiving points of the base station in sequence:

adding a first terminal for getting on the bus within the group.

9. The method of claim 8, wherein the step of adding a first terminal for pick-up within the group comprises:

10. The method of claim 1, wherein the plurality of terminals are grouped in a passing order according to signal change information when the plurality of terminals sequentially pass through the transceiving points of the base station; pairing a first grouping and a second grouping in the obtained groupings; for the terminals in the first group, selecting the terminals in the second group for pairing comprises:

11. The method of claim 10, wherein the pairing update trigger condition comprises at least one of:

updating a cell;

the time from the last update has reached an update period;

12. A base station, comprising:

13. A base station, comprising: a transceiver and a processor;

14. A base station comprising a memory, a processor and a program stored on the memory and executable on the processor; characterized in that the processor realizes the steps in the method of terminal pairing in MU-MIMO according to any of claims 1 to 11 when executing the program.

15. A readable storage medium, having stored thereon a program, which, when being executed by a processor, carries out the steps of the method for pairing terminals in MU-MIMO according to any of claims 1 to 11.