WO2015124103A1

WO2015124103A1 - User scheduling method and apparatus

Info

Publication number: WO2015124103A1
Application number: PCT/CN2015/073127
Authority: WO
Inventors: 李远军; 汪玲; 苏进喜
Original assignee: 大唐移动通信设备有限公司
Priority date: 2014-02-19
Filing date: 2015-02-15
Publication date: 2015-08-27
Also published as: CN103857053B; CN103857053A

Abstract

Disclosed are a user scheduling method and apparatus. The method comprises: network equipment determining a user equipment pair performing MU-MIMO (Multi-User Multiple Input Multiple Output) scheduling, the user equipment pair comprising first user equipment and second user equipment; the network equipment respectively instructing the two user equipment in the user equipment pair to perform port detection; for at least one user equipment in the user equipment pair, the network equipment sending a corresponding reference signal and traffic channel only on a part of ports detected under the instruction of the network equipment, so that the port for the network equipment to send the reference signal and the traffic channel to the first user equipment differs from the port for the network equipment to send the reference signal and the traffic channel to the second user equipment. The present invention can address the problem that owing to a wide difference between the performances of reception and processing at the user equipment side during MU-MIMO scheduling, inconsistent interference suppression capabilities lead to poor paired transmission performance of a plurality of users at the user equipment side.

Description

User scheduling method and device

The present application claims priority to Chinese Patent Application No. 201410056905.0, entitled "A User Scheduling Method and Apparatus", filed on February 19, 2014, the entire contents of which is incorporated herein by reference. .

Technical field

The present invention relates to the field of wireless communications, and in particular, to a user scheduling method and apparatus.

Background technique

The time-frequency domain locations of the reference signals of port 7 (port 7) and port 8 (port 8) in the LTE (Long Term Evolution) system are shown in Figure 1, where the time-frequency location of port 7/8/11/13 The time-frequency position of port9/10/12/14 is different. The orthogonal sequence (walsh matrix) between the four pilot sequences of port7/8/11/13 realizes the orthogonalization of the time-frequency sequence. Frequency resource multiplexing, port9/10/12/14 also uses the same multiplexing method.

MU-MIMO (Multi-User Multiple Input Multiple Output) indicates that the spatial independence of the channel is fully utilized in one Transmission Time Interval (TTI), and the same time-frequency resource is used. A plurality of UEs (User Equipments) are scheduled to improve the spectrum efficiency of the entire cell. The MU-MIMO scheme is supported in both TM8 mode (Transmission Mode 8, Transmission Mode 8) and Release 10 (Transmission Mode 9) in Release 10 of LTE Release 9. The 36212 protocol defines the corresponding scheduling scheme:

Table 1. Antenna port mapping relationship for one UE to transmit only one transport block in TM8 mode

禁用传输块的NDIDisable NDI for transport blocks		天线端口Antenna port
禁用传输块的NDIDisable NDI for transport blocks		天线端口Antenna port	00	77
11	88		00	77

The NDI (New Data Indicator) is a field of DCI (Downlink Control Information) sent by the base station to the UE. When NDI is 0, it indicates that the transport block is currently transmitted using port7, and when NDI is 1, it indicates that the transport block is currently transmitted using port8. The scrambling identity (SCID) is another field in the DCI sent by the base station to the UE. The value may be 0 or 1, corresponding to different reference signal sequences of the port 7 and port 8 antenna ports.

For a MU-MIMO scenario in which 2 UEs are scheduled and one spatial layer per UE, the NDI field of UE-1 is taken as 0. The MU-MIMO scheme shown in Figure 2a can be implemented by taking the NDI field of UE-2 to 1.

For a MU-MIMO scenario in which two UEs are scheduled and one spatial layer is used for each UE, the NDI field of UE-1 is taken as 0, and the NDI field of UE-2 is also taken as 0, but the SCID field of UE-1 is taken as 0, for the UE. The SCID field of -2 takes 1 to implement the MU-MIMO scheme shown in Figure 2b.

For a MU-MIMO scenario in which two UEs are scheduled and two spatial layers are used for each UE, UE-1 uses port7 and port8 (the corresponding SCID takes 0), and UE-2 also uses port7 and port8 (the corresponding SCID takes 1). The MU-MIMO scheme shown in Figure 3 can be implemented.

Table 2: Antenna port mapping relationship of one transport block and two transport blocks for one UE in TM9 mode

The n _{SCID in} Table 2 represents the scrambling ID (SCID) in TM9 mode, and similarly the MU-MIMO scheme shown in Figures 2a, 2b and 3 can also be implemented:

For 2 user MU-MIMO (1 spatial layer per user), configure the value of 0 on the left side of the corresponding table 2 in the DCI in the DCI, and configure the value = 2 on the UE-2;

For 2 user MU-MIMO (1 spatial layer per user), in the DCI, the corresponding UE-1 configuration corresponds to the left side of the Table 2 Value = 0, and the UE-2 is configured with Value = 1;

For 2-user MU-MIMO (2 spatial layers per user), in the DCI, the value of 0 on the right side of Table 2 is configured for UE-1, and Value=1 is configured for UE-2.

In the case where only one port is scheduled per user, the DCI schedule received by the UE only indicates one transport block, and the value of the NDI field according to Table 1 or the value of Table 2 is only 1 antenna port (port 7 or port 8). Receiving, Without loss of generality, it is assumed here that the DCI indication corresponding to UE-1 uses port7 (SCID=0). In order to suppress interference of UE-2 using the same time-frequency resource, UE-1 may adopt the following multiple interference suppression schemes:

(1) The most simplified processing, that is, UE-1 considers that the base station does not schedule MU-MIMO (that is, only UE-1 is scheduled), so that channel estimation is performed only on the reference signal sequence corresponding to port7, and subsequent detection is performed; In this case, if the base station actually schedules the UE-2 using the same channel resource, since the signal of the UE-2 is not suppressed as the interference of the UE-1, it is obvious that the reception performance of the UE-1 is significantly deteriorated;

(2) The most complicated processing, that is, UE-1 considers that the base station schedules MU-MIMO, and performs channel estimation on the reference signals corresponding to port7 (SCID=1), port8 (SCID=0), and port8 (SCID=1). Interference suppression process;

(3) compromise processing, that is, UE-1 compromises one or more of the partial reference channels (port7 (SCID=1), port8 (SCID=0), and port8 (SCID=1) according to its own capabilities. Channel estimation and interference suppression process.

According to the most complicated processing, the performance requirements of the UE are obviously improved, and the method of simplifying processing or compromise processing is not conducive to interference suppression and performance improvement. The actual test shows that the MU-MIMO receiving processing performance of different UEs is very different due to the different processing schemes mentioned above. The UE does not have a comprehensive grasp of the base station scheduling information, and the base station cannot grasp the actual processing of the UE when performing MU-MIMO pairing scheduling. Capability, the result can only rely on the UE to make compromises according to its own processing capabilities, and the interference suppression is insufficient, resulting in poor overall performance of MU-MIMO.

In the case where 2 ports are scheduled per user, both users use port7 and port8, but the scrambling ID (SCID) is different. For example, the reference signal positions of a total of four antenna ports of two UEs correspond to the reference signal positions of port 7 and port 8. Since port 7 and port 8 occupy the same set of time-frequency positions, the orthogonality between reference sequences is orthogonal sequence and plus The scrambling ID ensures that different scrambling IDs correspond to different m sequences. However, the actual test m sequence is a pseudo-random sequence. Compared with the Walsh (Walsh) code scheme and the frequency domain orthogonal scheme, the orthogonality is obviously poor. Due to the lack of orthogonality between the reference signals, the channel estimation is inaccurate. For the MU-MIMO of two users, the scheme of the port 7 and port 8 is scheduled to be poor for each user.

It can be seen that, due to the large difference in the receiving processing performance of the user equipment side during MU-MIMO scheduling, the inconsistent interference suppression capability may result in poor performance of multi-user pairing transmission on the user equipment side.

Summary of the invention

The embodiment of the present invention provides a user scheduling method and device, which are used to solve the problem that the user equipment side receiving processing performance difference is large due to the MU-MIMO scheduling, and the interference suppression capability is inconsistent, which may result in poor user-paired transmission performance of the user equipment side.

The user scheduling method provided by the embodiment of the present invention includes:

The network device determines a user equipment pair that performs MU-MIMO scheduling, where the user equipment pair includes the first user equipment And a second user equipment;

The network device respectively instructs two user equipments in the user equipment pair to perform port detection;

And the network device sends, according to the at least one user equipment, the corresponding reference signal and the service channel, on the part of the port that is instructed to be detected, so that the network device sends the reference signal to the first user equipment and The port used by the traffic channel is different from the port used to transmit the reference signal and the traffic channel to the second user equipment.

The scheduler provided by the embodiment of the present invention includes:

a determining unit, configured to determine a user equipment pair that performs MU-MIMO scheduling, where the user equipment pair includes a first user equipment and a second user equipment;

a port detection indicating unit, configured to respectively perform port detection by two user equipments in the user equipment pair by using a MAC protocol processing module;

a scheduling unit, configured to instruct the baseband processing module to send a corresponding reference signal and a traffic channel to the at least one user equipment of the user equipment pair, so that the network equipment is sent to the first user The port used by the device to transmit the reference signal and the traffic channel is different from the port used to transmit the reference signal and the traffic channel to the second user equipment.

The network device provided by the embodiment of the present invention includes: a MAC protocol processing module, a baseband processing module, and a scheduler;

The scheduler is configured to determine a user equipment pair that performs MU-MIMO scheduling, where the user equipment pair includes a first user equipment and a second user equipment; and the MAC protocol processing module respectively indicates that the user equipment is centered The two user equipments perform port detection; and instruct the baseband processing module to send a corresponding reference signal and a traffic channel only on the part of the user equipment indicated for the at least one user equipment of the user equipment pair, so that The port used by the network device to send the reference signal and the traffic channel to the first user equipment is different from the port used to send the reference signal and the traffic channel to the second user equipment.

The base station provided by the embodiment of the present invention includes: a processor, a memory, a transceiver, and a bus interface, wherein the processor, the memory, and the transceiver are connected by using a bus interface;

The processor is configured to read a program in the memory, and perform the following method: determining a user equipment pair that performs multi-user-multiple input multiple output MU-MIMO scheduling, where the user equipment pair includes a first user equipment and a second user equipment; respectively indicating port detection of two user equipments in the user equipment pair; and, for at least one user equipment of the user equipment pair, only the part of the port detected by the transceiver Transmitting a corresponding reference signal and a traffic channel, so that the port used by the network device to send the reference signal and the traffic channel to the first user equipment is different from the use of sending the reference signal and the traffic channel to the second user equipment Port

The memory is configured to store one or more executable programs, and may store data used by the processor when performing operations;

The transceiver is configured to send a reference signal and a traffic channel to the user equipment under the control of the processor;

The bus interface provides an interface, and the processor is responsible for managing the bus architecture and the usual processing.

The bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by the processor and various circuits of memory represented by the memory. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.

In the foregoing embodiment of the present invention, the network device is configured to perform the MU-MIMO scheduling user equipment pair, instruct the user equipment to perform port detection, and send the corresponding reference signal and the traffic channel on the indicated port, The at least one user equipment transmits the corresponding reference signal and the traffic channel only on the part of the port that is instructed to be detected, and the network device sends the reference signal and the traffic channel to the first user equipment in the user equipment pair. The port used is different from the port used for transmitting the reference signal and the traffic channel to the second user equipment, and on the other hand forcing the first user equipment or the second user equipment to perform port detection according to the indicated port, so that during MU-MIMO scheduling When the difference in reception processing performance on the user equipment side is large, interference can be reduced, and multi-user paired transmission performance can be improved.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying for inventive labor.

1 is a schematic diagram of a reference signal position of port 7/8/9/10/11/12/13/14 in the prior art;

2a and 2b are schematic diagrams of a MU-MIMO scheme for two-user and per-user single-port scheduling in the prior art;

3 is a schematic diagram of a MU-MIMO scheme for two-user and two-port per-user scheduling in the prior art;

4 is a schematic structural diagram of a network device and a user equipment according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an overall process of user scheduling according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a user scheduling process 600 according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a user scheduling process 700 according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a user scheduling process 800 according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a scheduler according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of a base station according to an embodiment of the present invention.

detailed description

The embodiment of the present invention provides a MU-MIMO scheduling scheme in an LTE system, which can improve channel estimation accuracy and detection performance of the UE in transmission mode 8 (TM8) and transmission mode 9 (TM9), thereby improving system capacity.

The present invention will be further described in detail with reference to the accompanying drawings, in which . All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The device involved in the embodiment of the present invention includes a network device and a user device, and the network device may be a base station or a network device having similar functions. FIG. 4 shows the structure of the network device 100 and the user device 200. As shown, the network device (base station) 400 can include a scheduler 110, a MAC (Media Access Control) protocol processing module 120, a baseband processing module 130, and a radio frequency module 140. The functions related to the embodiments of the present invention are described as follows:

The scheduler 110 is responsible for performing MU-MIMO UE pairing, determining scheduling result parameters, including PRB (Physical Resource Block) resource location, MCS (Modulation and Coding Scheme) level, and the like, and indicating baseband processing. The module 130 performs coding, reference signal to time-frequency mapping, and PDSCH (Physical downlink shared channel) to time-frequency mapping. The MAC protocol processing module 120 is responsible for processing the HARQ (Hybrid Automatic Repeat Request) process, that is, processing the ACK/NACK (ACKnowledgement/Non-ACKnowledgement) fed back by the UE, and the NACK fed back by the UE usually needs to be retransmitted. Corresponding to the transport block to correct the transport block that failed to transmit. The baseband processing module 130 is responsible for encoding, mapping of reference signals to time-frequency resources, mapping of PDSCH to time-frequency, and the like. The radio frequency module 140 is responsible for radiating the time domain baseband signal to the air at a specified power for reception by the UE.

The user equipment 200 can include a MAC protocol processing module 210, a baseband processing module 220, and a radio frequency module 230. The functions related to the embodiments of the present invention are described as follows:

The radio frequency module 230 is responsible for receiving the radio frequency signal transmitted by the network device (base station) 100 and converting it into a baseband signal for processing by the baseband processing module 220. The baseband processing module 220 performs channel estimation based on the received reference signal and performs demodulation and decoding processing on the PDSCH. The MAC protocol processing module 210 is responsible for the HARQ process, that is, feeding back ACK/NACK to the network device (base station) 100 according to the decoding result of the PDSCH by the baseband processing module 220.

FIG. 5 is a schematic diagram of an overall process 500 of user scheduling according to an embodiment of the present invention. The structure of the network device involved may be, for example, a network device (base station) 100, and the structure of the UE may be, for example, the user equipment 200. The scheduling process can include the following steps 510-530:

Step 510: The network device determines a UE pair that performs MU-MIMO scheduling, where the UE pair includes a first user equipment (represented as UE-1) and a second user equipment (represented as UE-2).

In this step, the network device can perform MU-MIMO UE pairing according to spatial isolation. For example, the network device (base station) 100 is used as an example. The scheduler 110 can obtain spatial channel information of the UE-1 and the UE-2 by measuring a SRS (Sounding Reference Signal) channel, thereby calculating spatial isolation information. UE-1 and UE-2 can be paired for MU-MIMO scheduling beyond the isolation threshold (for example, the incoming wave angle > 30 degrees).

Step 520: The network device respectively instructs the two UEs in the UE pair to perform port detection.

Step 530: For at least one UE of the UE pair, send a corresponding reference signal and a traffic channel only on the part of the port that is indicated to be detected, so that the network device sends the reference signal and the used channel to the UE-1. The port is different from the port used to transmit the reference signal and the traffic channel to UE-2.

Further, when the network device receives the NACK returned by the UE-1 or the UE-2 for the transport block transmitted on the indicated first port, the network device determines that the UE-1 or the UE-2 detects the The first port, but not transmitting the transport block on the first port, rejects the transport block retransmission for the NACK.

Further, the network device can obtain the UE protocol version information reported by the UE before scheduling the UE. For example, the network device can obtain the protocol version information reported by the UE according to the UE capability transfer process defined in the 3GPP (3rd Generation Partnership Project) 36331.

The protocol version information of the two UEs performing MU-MIMO pairing has the following combinations:

Combination case 1: UE-1 and UE-2 are both Release 9 versions;

Combination case 2: UE-1 and UE-2 are both Release 10 or higher;

Combination case 3: UE1 is Release 9 version and UE-2 is Release 10 or higher.

According to the above combinations, the embodiment of the present invention provides the following scheduling modes:

For the combination case 1, the process 600 shown in FIG. 6 is adopted;

For the combination case 2, the process 600 shown in FIG. 6 or the process 700 shown in FIG. 7 or the process 800 shown in FIG. 8 is adopted;

For the combination case 3, the process 600 described in FIG. 6 or the process 800 shown in FIG. 8 is employed.

As shown in the above process, the network device performs the scheduling mode decision according to the user equipment protocol version information reported by the user equipment, so as to ensure that two user equipments that perform MU-MIMO scheduling pairing use different ports to receive the network device to send. The reference signal and the traffic channel can reduce interference and improve multi-user paired transmission performance when the user equipment side reception processing performance difference is large during MU-MIMO scheduling.

Referring to FIG. 6, if the protocol versions of UE-1 and UE-2 are not lower than Release 9, the process 600 is executed:

In S610 and S620, the network device instructs UE-1 and UE-2 to detect port7 and port8 through the control channel. For example, based on the network device (base station) 100 shown in FIG. 4, the scheduler 110 instructs the PDCCH (Physical Downlink Control Channel) sent by the MAC protocol processing module 120 to the UE-1 (using the DCI format 2B), including There are 2 transport blocks (corresponding to port7 and port8), and the scheduler 110 instructs the PDCCH (using DCI format 2B) sent by the MAC protocol processing module 120 to the UE-2, including 2 transport blocks (corresponding to port7 and port8).

In S611 and S621, for UE-1, the network device does not send a corresponding reference signal and a traffic channel on port8, and for UE-2, the network device does not send a corresponding reference signal and a traffic channel on port7. For example, based on the network device (base station) 100 shown in FIG. 4, the scheduler 110 indicates to the baseband processing module 130 that the reference signal corresponding to the port 8 and the PDSCH corresponding to the port 8 are not transmitted to the UE-1; the scheduler 110 indicates to the baseband processing module 130. The reference signal corresponding to port 7 and the PDSCH corresponding to port 7 are not transmitted to UE-2.

In S612 and S622, UE-1 and UE-2 perform HARQ feedback, respectively. For UE-1, since the PDCCH indicates two transport blocks (corresponding to port7 and port8), the baseband processing module 220 of UE-1 will perform channel estimation on both port7 and port8, but since the network device does not actually UE -1 sends the reference signal corresponding to port8 and the PDSCH. Therefore, UE-1 must respond to the NACK of the transport block carried by port8 and perform normal feedback on the transport block carried by port7. Similarly, for UE-2, the PDCCH indicates 2 transmissions. The block (corresponding to port7 and port8), the baseband processing module 220 of UE-2 will perform channel estimation on both port7 and port8, but since the network device does not actually send the reference signal and PDSCH corresponding to port7 to UE-2, UE- 2 It is necessary to respond to the NACK of the transport block carried by port7 and perform normal feedback on the transport block carried by port8.

In S613 and S623, the network device processes the ACK/NACK fed back by UE-1 and UE-2, respectively. When the network device receives the NACK of the transport block on the port 8 of the UE8, the network device refuses to perform the transport block retransmission; when the user equipment receives the NACK of the transport block of the UE-2 for the port 7, the network device refuses to perform the transport block weight. pass. For example, based on the network device (base station) 100 shown in FIG. 4, for UE-1, the MAC protocol processing module 120 processes the NACK information of the UE-1: the NACK of the transport block corresponding to the port 8 of the UE-1 is not heavy. Transmitting, for the transport block corresponding to port-1 of UE-1, transmitting the retransmitted transport block on the initially transmitted port; for UE-2, the MAC protocol processing module 120 processes the NACK information of UE-2: port 7 to UE-2 The NACK of the corresponding transport block is not retransmitted, and the transport block corresponding to the port 8 of the UE-2 transmits the retransmitted transport block on the initially transmitted port.

Comparing the foregoing process 600 with the prior art, it can be seen that, in the prior art, for two Release 9 versions of the UE, when the base station uses port7 to schedule UE-1 and UE-2 (using different SCIDs to distinguish reference signals) The UE side interference suppression performance is poor due to the poor orthogonality of the channel estimation sequence. For the two Release 9 versions of the UE, the base station indicates that the UE-1 detects the port 7 through the PDCCH, and instructs the UE-2 to detect the port 8, and the UE side is the most simplified. When processing or compromise processing, the interference caused by UE-1 to suppress UE-2 is not optimal. Compared with the prior art, in the process 600 of the embodiment of the present invention, since the PDCCH indicates that the UE-1 and the UE-2 detect both the port 7 and the port 8, the UE can be forced to perform channel estimation and interference suppression on two ports (ie, The signals transmitted by UE-1 and UE-2 are also estimated and suppressed, which solves the problem that the UE side receiving processing performance difference is large when MU-MIMO scheduling is performed, and the multi-user pairing transmission performance problem caused by the inconsistent interference capability is suppressed, thereby Can achieve better performance than the prior art.

Referring to FIG. 7, if UE-1 and UE-2 are both Release 10 or higher, the process 700 is executed:

In S710 and S720, the network device instructs UE-1 and UE-2 to detect ports 7-10 through the control channel. For example, based on the network device (base station) 100 shown in FIG. 4, the scheduler 110 instructs the PDCCH (using DCI format 2C) that the MAC protocol processing module 120 sends to the UE-1, including two transport blocks, and the DCI format 2C. The field value corresponding to "two codewords" in Table 2 is set to 3, that is, "4 layers, port 7 to 10"; the scheduler 110 instructs the PDCCH (using DCI format 2C) that the MAC protocol processing module 120 transmits to the UE-2, where Two transport blocks are included, and the field value of "two codewords" corresponding to Table 2 in DCI format 2C is set to 3, that is, "4 layers, port 7-10".

In S711 and S721, for UE-1, the network device does not send the corresponding reference signal and traffic channel on port9 and port10. For UE-2, the network device does not send the corresponding reference signal and traffic channel on port7 and port8. For example, based on the network device (base station) 100 shown in FIG. 4, the scheduler 110 indicates to the baseband processing module 130 that the reference signal corresponding to the port 9 and the port 10 and the PDSCH corresponding to the port 9 and the port 10 are not transmitted to the UE-1; the scheduler 110 is directed to the baseband. The processing module 130 indicates that the reference signal corresponding to the port 7 and the port 8 and the PDSCH corresponding to the port 7 and the port 8 are not transmitted to the UE-2.

In S712 and S722, UE-1 and UE-2 perform HARQ feedback, respectively. For UE-1, since the PDCCH indicates 2 transport blocks and 4 layers, the baseband processing module 220 of UE-1 will perform channel estimation on ports 7-10, but the network device does not actually UE-1. Sending the reference signal and the PDSCH corresponding to the port 9 and the port 10, so the UE-1 must respond to the NACK of the transport block carried by the port 9 and the port 10 of the UE-1, and perform normal feedback on the transport block carried by the port 7 and the port 8 of the UE-1; similarly, For UE-2, since the PDCCH indicates 2 transport blocks and 4 layers, the baseband processing module 220 of UE-2 will perform channel estimation on both ports 7-10, but since the network device does not actually send port7 to UE-2. The reference signal corresponding to the port 8 and the PDSCH, therefore, the UE-1 must respond to the NACK of the transport block carried by the port 7 and the port 8 of the UE-2, and perform normal feedback on the transport block carried by the port 9 and the port 10 of the UE-2.

In S713 and S723, the network device processes the ACK/NACK fed back by UE-1 and UE-2, respectively. Wherein, when the network device receives the NACK of the transport block of the UE-1 for the port 9 or the port 10, the network device refuses to perform the transport block retransmission; When the device receives the NACK of the UE-2 for the transport block on port7 or port8, the device refuses to perform the transport block retransmission. For example, based on the network device (base station) 100 shown in FIG. 4, for UE-1, the MAC protocol processing module 120 processes the NACK information of the UE-1: the NACK of the transport block corresponding to the port 9 and the port 10 of the UE-1 is not Performing retransmission, transmitting the retransmitted transport block on the initially transmitted port to the transport block corresponding to port-1 and port8 of UE-1; for UE-2, the MAC protocol processing module 120 processes the NACK information of UE-2: for the UE The NACK of the transport block corresponding to port 7 and port 8 of -2 is not retransmitted, and the transport block corresponding to port 9 and port 10 of UE-2 transmits the retransmitted transport block on the initial transmitted port.

Comparing the foregoing process 700 with the prior art, it can be seen that, in the prior art, for two Release 10 versions of the UE, the UE-1 is detected by the PDCCH to detect port 7 (scrambling ID=0) and port8 (scrambling ID=0). And instruct UE-2 to detect port7 (scrambling ID=1) and port8 (scrambling ID=1), since port7 and port8 occupy the same time-frequency resource, and the m-sequence corresponding to different scrambling IDs is adopted. The orthogonality is poor, and it is difficult to perform effective interference suppression when receiving on the UE side, and thus the performance is poor. Compared with the prior art, in the process 700 of the embodiment of the present invention, the PDCCH indicates that the UE-1 and the UE-2 detect the ports 7 to 10, but the network side controls that only the port 7 and the port 8 are actually sent to the UE-1. The reference signal and the PDSCH, for the UE-2, actually only transmit the reference signals of the port 9 and the port 10 and the PDSCH, so that the actual effective reference signals of the UE-1 are located at the ports 7 and port 8, and the actual effective reference signals of the UE-2 are located at the port 9 And port10, since port 7-8 and port 9-10 are different in frequency, so that there is very good orthogonality, so that the UE side can achieve more accurate channel estimation and perform effective interference suppression, that is, compared Better performance of the prior art.

Referring to FIG. 8, if UE1 is not lower than the Release 9 version and UE-2 is Release 10 or higher, the process 800 is executed:

In S810 and S820, the network device instructs UE-1 to detect port7 and/or port8 through the control channel, instructing UE-2 to detect ports 7-10. For example, based on the network device (base station) 100 shown in FIG. 4, the scheduler 110 instructs the PDCCH (using the DCI format 2B) that the MAC protocol processing module 120 sends to the UE-1, and may specifically include one or two according to the actual channel state. a transport block (corresponding to port 7 and/or port 8); the scheduler 110 instructs the PDCCH (using DCI format 2C) sent by the MAC protocol processing module 120 to the UE-2, including 2 transport blocks, and the corresponding table 2 in the DCI format 2C The field value of "two codewords" is set to 3, which is "4 layers, port7~10".

In S811 and S821, for UE-1, the network device transmits a corresponding reference signal and a traffic channel on the port indicating the detection, and for UE-2, the network device does not transmit the corresponding reference signal and the traffic channel on port7 and port8. For example, based on the network device (base station) 100 shown in FIG. 4, the scheduler 110 instructs the baseband processing module 130 to transmit a reference signal and a PDSCH corresponding to one or two transport blocks of the PDCCH of the UE-1; the scheduler 110 processes the baseband The module 130 indicates that the reference signal corresponding to port7 and port8 and the PDSCH corresponding to port7 and port8 are not transmitted to UE-2.

In S812 and S822, UE-1 and UE-2 perform HARQ feedback, respectively. For UE-1, the baseband processing module 220 of UE-1 will perform channel estimation on the indicated detected port and respond to the transport block carried by the corresponding port. ACK/NACK; for UE-2, since the PDCCH indicates 2 transport blocks and 4 layers, the baseband processing module 220 of UE-2 will perform channel estimation on ports 7-10, but since the network device does not actually UE -2 sends the reference signal and PDSCH corresponding to port7 and port8. Therefore, UE-1 must respond to the NACK of the transport block carried by port7 and port8 of UE-2, and perform normal feedback on the transport block carried by port9 and port10 of UE-2.

In S813 and S823, the network device processes the ACK/NACK fed back by UE-1 and UE-2, respectively. Wherein, when the network device receives the ACK/NACK of the transport block of the UE-1 for the port 7 or the port 8, the network device performs the processing according to the protocol specified manner; when the network device receives the NACK of the transport block of the UE-2 for the port 7 or port 8 , refused to transfer block retransmission. For example, based on the network device (base station) 100 shown in FIG. 4, for UE-1, the MAC protocol processing module 120 processes the NACK information of the UE-1: retransmitting the transport block that the UE-1 feeds back as NACK; The UE-2, the MAC protocol processing module 120 processes the NACK information of the UE-2: the NACK of the transport block corresponding to the port 7 and the port 8 of the UE-2 is not retransmitted, and the transport block corresponding to the port 9 and port 10 of the UE-2 is The retransmitted transport block is transmitted on the initial port.

Comparing the foregoing process 800 with the prior art, it can be seen that, in the prior art, when UE-1 is Release 9 version and UE-2 Release 10 or higher, UE-1 is instructed to detect port 7 through the PDCCH (scrambling ID). =0) and port8 (scrambling ID=0), and instruct UE-2 to detect port7 (scrambling ID=1) and port8 (scrambling ID=1), since port7 and port8 occupy the same time-frequency resource, Moreover, the m-sequence orthogonality corresponding to different scrambling IDs is poor, and it is difficult to perform effective interference suppression when receiving on the UE side, and the performance is poor. Compared with the prior art, in the process 800 of the embodiment of the present invention, the PDCCH indicates that the UE-1 detects the port 7 and/or the port 8, and instructs the UE-2 to detect the ports 7 to 10, but controls the UE on the network side. 2 Actually only transmit the reference signals of port9 and port10 and PDSCH, so that the actual effective reference signals of UE-1 are located at port7 and/or port8, and the actual effective reference signals of UE-2 are located in port9 and port10, due to port7~ 8 and port 9 to 10 are different in frequency, so that there is very good orthogonality, so that the UE side can achieve more accurate channel estimation and perform effective interference suppression, that is, obtain better than the prior art. performance.

Based on the same technical concept, the embodiment of the present invention further provides a scheduler, which can be applied to the network device in the foregoing embodiment.

FIG. 9 is a schematic structural diagram of a scheduler according to an embodiment of the present invention. As shown, the scheduler 300 can include a determining unit 310, a port detection indicating unit 320, and a scheduling unit 330, where:

a determining unit 310, configured to determine a user equipment pair that performs MU-MIMO scheduling, where the user equipment pair includes a first user equipment and a second user equipment;

The port detection instructing unit 320 is configured to perform port detection on the two user equipments in the user equipment pair by using a MAC protocol processing module.

The scheduling unit 330 is configured to instruct the baseband processing module to send, according to the at least one user equipment of the user equipment pair, a corresponding reference signal and a traffic channel on the part of the indicated detected port, so that the network device is first The port used by the user equipment to transmit the reference signal and the traffic channel is different from the port used to transmit the reference signal and the traffic channel to the second user equipment.

Preferably, the port detection indication unit 320 is specifically configured to: if the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 9, instruct the MAC protocol processing module to indicate the first user by using a control channel The device and the second user equipment both detect the port 7 and the port 8; correspondingly, the scheduling unit 330 is specifically configured to: indicate that the baseband processing module does not send the corresponding reference signal and the service channel on the port 8 for the first user equipment, And for the second user equipment, the corresponding reference signal and the traffic channel are not sent on the port 7.

Preferably, the port detection indication unit 320 is specifically configured to: if the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 10, instruct the MAC protocol processing module to indicate the first user by using a control channel The device and the second user equipment both detect the port 7 to the port 10; correspondingly, the scheduling unit 330 is specifically configured to: indicate that the baseband processing module does not send the corresponding reference signal to the first user equipment on the port 9 and the port 10 A traffic channel, and for the second user equipment not transmitting corresponding reference signals and traffic channels on port 7 and port 8.

Preferably, the port detection indication unit is specifically configured to: if the protocol version of the first user equipment is not lower than 3GPP Release 9, and the protocol version of the second user equipment is not lower than 3GPP Release 10, indicating that the MAC protocol processing module passes the control The channel indicates that the first user equipment detects the port 7 and/or the port 8, and instructs the second user equipment to detect the port 7 to the port 10; correspondingly, the scheduling unit 330 is specifically configured to: indicate the baseband processing module for the A user equipment transmits a corresponding reference signal and a traffic channel on the port indicating the detection, and the corresponding reference signal and the traffic channel are not transmitted on the port 7 and the port 8 for the second user equipment.

Preferably, the scheduling unit 330 is further configured to: when receiving the NACK returned by the first user equipment or the second user equipment for the transport block transmitted on the indicated first port, if it is determined that the first user is indicated The device or the second user equipment detects the first port but does not send a transport block on the first port, and instructs the MAC protocol processing module to reject the transport block retransmission for the NACK.

Based on the same principle, the embodiment of the present invention further provides a base station. As shown in FIG. 10, the base station mainly includes: a processor 410, a memory 420, a transceiver 430, and a bus interface 440, wherein the processor, the memory, and the transceiver Connected via a bus interface;

The processor 410 is configured to read a program in the memory 420, and perform the following method: determining a user equipment pair that performs multi-user-multiple input multiple output MU-MIMO scheduling, where the user equipment pair includes the first user equipment and the second User equipment; respectively, performing port detection on two user equipments in the user equipment pair; and, for at least one user equipment in the user equipment pair, transmitting, by the transceiver 430, only on the part of the port that is instructed to be detected Reference signal and traffic channel such that the port used by the network device to transmit the reference signal and the traffic channel to the first user equipment is different from the port used to transmit the reference signal and the traffic channel to the second user equipment;

The memory 420 is configured to store one or more executable programs, and may store data used by the processor 410 when performing operations;

The transceiver 430 is configured to send a reference signal and a traffic channel to the user equipment under the control of the processor 410.

Bus interface 440 provides an interface for the processor to manage the bus architecture and normal processing.

In FIG. 10, the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 410 and various circuits of memory represented by memory 420. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.

Preferably, the processor 410 is further configured to: if the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 9, indicating the first user equipment and the second user equipment Detecting port 7 and port 8; and, for the first user equipment, transmitting corresponding reference signals and traffic channels only on port 7 through transceiver 430, and for port 2 only for port 2 Send the corresponding reference signal and traffic channel.

Preferably, the processor 410 is specifically configured to: if the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 10, instruct the first user equipment and the second user equipment to detect Port 7 to port 10; for the first user equipment not transmitting corresponding reference signals and traffic channels on port 9 and port 10, and for the second user equipment not transmitting corresponding reference signals on port 7 and port 8 Traffic channel.

Preferably, the processor 410 is specifically configured to: if the protocol version of the first user equipment is not lower than 3GPP Release 9, the protocol version of the second user equipment is not lower than 3GPP Release 10, indicating the first user The device detects port 7 and/or port 8, and instructs the second user equipment to detect port 7 to port 10; the transceiver 430 transmits a corresponding reference signal to the first user equipment on the port indicating the detection and A traffic channel, and for the second user equipment not transmitting corresponding reference signals and traffic channels on port 7 and port 8.

Preferably, the processor 410 is further configured to: when receiving the negative acknowledgement NACK returned by the first user equipment or the second user equipment for the transport block transmitted on the indicated first port, if the base station is determined Although the first user equipment or the second user equipment is instructed to detect the first port, but the transport block is not sent on the first port, the transport block retransmission for the NACK is rejected.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention is directed to a flowchart of a method, apparatus (system), and computer program product according to an embodiment of the present invention. And / or block diagram to describe. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. The computer program instructions can be provided to a general purpose computer, a special purpose computer, an embedded processor, or a processor of other programmable data processing device such that instructions executed by a processor of the computer or other programmable data processing device can be implemented in a flowchart The function specified in one or more processes and/or block diagrams in one or more blocks.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A user scheduling method, comprising:

The network device determines a user equipment pair that performs multi-user-multiple input multiple output MU-MIMO scheduling, where the user equipment pair includes the first user equipment and the second user equipment;

The network device respectively instructs two user equipments in the user equipment pair to perform port detection;

And the network device sends, according to the at least one user equipment, the corresponding reference signal and the service channel on the part of the port that is instructed to be detected, so that the network device sends a reference to the first user equipment. The ports used by the signal and traffic channels are different from the ports used to transmit reference signals and traffic channels to the second user equipment.
The method of claim 1, wherein the network device respectively performs port detection on two user equipments of the user equipment pair, including:

If the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 9, the network device indicates, by using a control channel, that the first user equipment and the second user equipment both detect a port. 7 and port 8;

And the network device sends the corresponding reference signal and the service channel only on the part of the port that is instructed to be detected by the at least one user equipment of the user equipment, including:

For the first user equipment, the network device sends only the corresponding reference signal and the traffic channel on the port 7, and for the second user equipment, only the corresponding reference signal and the traffic channel are sent on the port 8.
The method of claim 1, wherein the network device respectively performs port detection on two user equipments of the user equipment pair, including:

If the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 10, the network device indicates, by using a control channel, that the first user equipment and the second user equipment both detect a port. 7 to port 10;

And the network device sends the corresponding reference signal and the service channel only on the part of the port that is instructed to be detected by the at least one user equipment of the user equipment, including:

The user equipment does not send a corresponding reference signal and a traffic channel on the port 9 and the port 10 for the first user equipment, and does not send a corresponding reference signal on the port 7 and the port 8 for the second user equipment. Traffic channel.
The method of claim 1, wherein the network device respectively performs port detection on two user equipments of the user equipment pair, including:

If the protocol version of the first user equipment is not lower than the protocol version of the second user equipment in 3GPP Release 9, Not less than 3GPP Release 10, the network device instructs the first user equipment to detect port 7 and/or port 8 through a control channel, and instructs the second user equipment to detect port 7 to port 10;

And the network device sends the corresponding reference signal and the service channel only on the part of the port that is instructed to be detected by the at least one user equipment of the user equipment, including:

The network device sends a corresponding reference signal and a traffic channel on the port indicating the detection, and the corresponding reference signal and service are not sent on the port 7 and the port 8 for the second user equipment. channel.
The method according to any one of claims 2-4, wherein the control channel is a physical downlink control channel PDCCH, and the traffic channel is a physical downlink shared channel PDSCH.
The method of any of claims 1-4, wherein the method further comprises:

When the network device receives the negative acknowledgment NACK returned by the first user equipment or the second user equipment for the transport block transmitted on the indicated first port, if the network device determines that the network device indicates A user equipment or the second user equipment detects the first port but does not transmit a transport block on the first port, and refuses to perform transport block retransmission for the NACK.
A scheduler, comprising:

a determining unit, configured to determine a user equipment pair that performs multi-user-multiple input multiple output MU-MIMO scheduling, where the user equipment pair includes a first user equipment and a second user equipment;

a port detection indication unit, configured to instruct, by the media access control MAC protocol processing module, port detection of two user equipments in the user equipment pair;

a scheduling unit, configured to instruct the baseband processing module to send, according to the at least one user equipment of the user equipment pair, a corresponding reference signal and a traffic channel on the part of the port that is instructed to detect, to enable the network device to The port used by a user equipment to transmit the reference signal and the traffic channel is different from the port used to transmit the reference signal and the traffic channel to the second user equipment.
The scheduler according to claim 7, wherein the port detection indicating unit is specifically configured to: if the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 9, Instructing the MAC protocol processing module to instruct the first user equipment and the second user equipment to detect port 7 and port 8 through a control channel;

The scheduling unit is specifically configured to: instruct the baseband processing module to send a corresponding reference signal and a traffic channel to the first user equipment not on the port 8, and send the corresponding reference to the second user equipment not on the port 7. Signal and traffic channels.
The scheduler according to claim 7, wherein the port detection indicating unit is specifically configured to: if the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 10, MAC Association The processing module indicates that the first user equipment and the second user equipment both detect the port 7 to the port 10 through the control channel;

The scheduling unit is specifically configured to: instruct the baseband processing module not to send a corresponding reference signal and a traffic channel to the first user equipment on the port 9 and the port 10, and not to the port 7 and the port for the second user equipment The corresponding reference signal and the traffic channel are transmitted on 8.
The scheduler according to claim 7, wherein the port detection indication unit is specifically configured to: if the protocol version of the first user equipment is not lower than the protocol version of the second user equipment of 3GPP Release 9, Not less than 3GPP Release 10, instructing the MAC protocol processing module to instruct the first user equipment to detect port 7 and/or port 8 through a control channel, and instructing the second user equipment to detect port 7 to port 10;

The scheduling unit is specifically configured to: instruct the baseband processing module to send a corresponding reference signal and a traffic channel on the port indicating the detection for the first user equipment, and not in the port 7 and the port 8 for the second user equipment The corresponding reference signal and the traffic channel are transmitted on.
The scheduler according to any one of claims 7 to 10, wherein the scheduling unit is further configured to: receive the first detected by the first user equipment or the second user equipment for the indication When the negative acknowledgement NACK returned by the transport block transmitted on the port, if it is determined that the first user equipment or the second user equipment is instructed to detect the first port, but the transmission is not sent on the first port Block, instructing the MAC protocol processing module to reject the transport block retransmission for the NACK.
A network device, comprising: a media access control MAC protocol processing module, a baseband processing module, and a scheduler;

The scheduler is configured to determine a user equipment pair that performs multi-user-multiple input multiple output MU-MIMO scheduling, where the user equipment pair includes a first user equipment and a second user equipment; Instructing the two user equipments of the user equipment pair to perform port detection; and instructing the baseband processing module to send a corresponding reference only on the part of the user equipment that is instructed to detect The signal and the traffic channel are such that the port used by the network device to transmit the reference signal and the traffic channel to the first user equipment is different from the port used to transmit the reference signal and the traffic channel to the second user equipment.
The network device according to claim 12, wherein the scheduler is specifically configured to: if the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 9, the indication device The MAC protocol processing module instructs the first user equipment and the second user equipment to detect the port 7 and the port 8 through the control channel; and indicates that the baseband processing module is only in the port for the first user equipment The corresponding reference signal and the traffic channel are transmitted on the node 7, and the corresponding reference signal and the traffic channel are transmitted only on the port 8 for the second user equipment.
The network device according to claim 12, wherein the scheduler is specifically configured to: if the first The protocol version of the user equipment and the second user equipment are not lower than the 3GPP Release 10, and the MAC protocol processing module is instructed to indicate, by using the control channel, that the first user equipment and the second user equipment both detect the port 7 to the port. 10: indicating that the baseband processing module does not send a corresponding reference signal and a traffic channel on the port 9 and the port 10 for the first user equipment, and does not send a corresponding reference for the second user equipment not on the port 7 and the port 8. Signal and traffic channels.
The network device according to claim 12, wherein the scheduler is specifically configured to: if the protocol version of the first user equipment is not lower than 3GPP Release 9, the protocol version of the second user equipment is not low In 3GPP Release 10, the MAC protocol processing module is instructed by the control channel to instruct the first user equipment to detect port 7 and/or port 8, and instruct the second user equipment to detect port 7 to port 10; The baseband processing module sends a corresponding reference signal and a traffic channel to the first user equipment on the port indicating the detection, and does not send the corresponding reference signal and the traffic channel on the port 7 and the port 8 for the second user equipment. .
The network device according to any one of claims 12-15, wherein the scheduler is further configured to:

Receiving, by the first user equipment or the second user equipment, a negative acknowledgement NACK returned by the transport block transmitted on the first port indicated to be detected, if it is determined that the network device indicates the first user equipment or And the second user equipment detects the first port, but does not send a transport block on the first port, and instructs the MAC protocol processing module to refuse to perform transport block retransmission for the NACK.
A base station, comprising: a processor, a memory, a transceiver, and a bus interface, wherein a processor, a memory, and a transceiver are connected by a bus interface;

The processor is configured to read a program in the memory, and perform the following method: determining a user equipment pair that performs multi-user-multiple input multiple output MU-MIMO scheduling, where the user equipment pair includes a first user equipment and a second user equipment; respectively indicating port detection of two user equipments in the user equipment pair; and, for at least one user equipment of the user equipment pair, only the part of the port detected by the transceiver Transmitting a corresponding reference signal and a traffic channel, so that the port used by the network device to send the reference signal and the traffic channel to the first user equipment is different from the use of sending the reference signal and the traffic channel to the second user equipment Port

The memory is configured to store one or more executable programs, and may store data used by the processor when performing operations;

The transceiver is configured to send a reference signal and a traffic channel to the user equipment under the control of the processor;

The bus interface is for providing an interface.
The base station according to claim 17, wherein the processor is specifically configured to: if the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 9, The first user equipment and the second user equipment both detect port 7 and port 8; and, for the first user equipment, through the transceiver The corresponding reference signal and the traffic channel are transmitted only on port 7, and for the second user equipment, only the corresponding reference signal and the traffic channel are transmitted on port 8.
The base station according to claim 17, wherein the processor is specifically configured to: if the protocol versions of the first user equipment and the second user equipment are not lower than 3GPP Release 10, indicating the first Both the user equipment and the second user equipment detect port 7 to port 10; for the first user equipment, the corresponding reference signal and the traffic channel are not sent on port 9 and port 10, and the port is not in the port for the second user equipment The corresponding reference signal and traffic channel are transmitted on port 7 and port 8.
The base station according to claim 17, wherein the processor is specifically configured to: if the protocol version of the first user equipment is not lower than 3GPP Release 9, the protocol version of the second user equipment is not lower than 3GPP Release 10, instructing the first user equipment to detect port 7 and/or port 8, and instructing the second user equipment to detect port 7 to port 10; indicating by the transceiver to the first user equipment The detected reference signal and the traffic channel are sent on the detected port, and the corresponding reference signal and the traffic channel are not sent on the port 7 and the port 8 for the second user equipment.
The base station according to any one of claims 17 to 20, wherein the processor is further configured to:

Receiving, by the first user equipment or the second user equipment, a negative acknowledgment NACK returned by the transport block transmitted on the indicated first port, if it is determined that the base station indicates the first user equipment or The second user equipment detects the first port, but does not send a transport block on the first port, and refuses to perform transport block retransmission for the NACK.