CN107959937A

CN107959937A - The definite of transmission mode, data transmission method and device, communication system

Info

Publication number: CN107959937A
Application number: CN201610903896.3A
Authority: CN
Inventors: 陈林; 张芳; 张楠
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-10-17
Filing date: 2016-10-17
Publication date: 2018-04-24
Anticipated expiration: 2036-10-17
Also published as: WO2018072699A1; CN107959937B

Abstract

The present invention provides a kind of the definite of transmission mode, data transmission method and device, communication system, wherein, above-mentioned definite method includes：Base station is determined as the down going channel number of UE distribution and the optimal direction of the launch of wave beam, wherein, the optimal direction of the launch is the optimal direction of the launch of signal quality in the direction of the launch of wave beam；The base station sends up the dedicated CSI RS of the UE in the optimal launch party；The base station receives the CSI measurement reports that the UE CSI RSs dedicated to the UE is measured；The base station determines the downlink transfer pattern of the UE according at least one of：The beamforming capabilities information for the UE that the base station obtains for the transmission channel number of UE distribution, the RI values in the CSI measurement reports and the base station.

Description

Transmission mode determination method, data transmission device and communication system

Technical Field

The present invention relates to the field of communications, and in particular, to a method and an apparatus for determining a transmission mode, a method and an apparatus for transmitting data, and a communication system.

Background

To achieve the 5G goal: a 1000 times mobile data traffic per area increase, a 10 to 100 times throughput per user increase, a 10 to 100 times increase in the number of connected devices, a 10 times battery life extension of low power devices and a 5 times end-to-end delay decrease, some new wireless technology solutions have to be proposed in 5G. The two most prominent features are: throughput, peak rate increases by 1-2 orders of magnitude, and end-to-end delay decreases by several times. The use of large bandwidths (500M-1GHz) in the millimeter wave band is the primary solution to address the exponential growth of data traffic throughput in the future.

In order to meet the requirement of high throughput of 5G communication, a concept of high frequency communication is proposed, and antennas at a base station and a terminal side generally transmit and receive in a beam forming manner due to large propagation loss in air in a high frequency band in the high frequency communication. In the related art, a high-frequency multi-antenna in a 4G communication system generally comprises a plurality of transceiving channels, and each transceiving channel can transmit and receive in multiple directions. Different User equipments (UE for short) can be scheduled on different transceiving channels, and spatial multiplexing is achieved between UEs through different transceiving channels. However, the above scheme hardly satisfies the requirement for throughput in 5G communication. Therefore, the downlink Channel state information-Reference Signal (CSI-RS) of each terminal, the downlink transmission mode and the related measurement process need to be redesigned to meet the design target of 5G. However, the related art does not provide a corresponding solution.

Disclosure of Invention

The embodiment of the invention provides a method and a device for determining a transmission mode and transmitting data and a communication system, which are used for at least solving the problem that a scheme for determining a downlink transmission mode in a 5G communication process in the related art cannot meet the requirement of high-frequency communication.

According to an embodiment of the present invention, there is provided a method for determining a transmission mode, including:

a base station determines the number of downlink channels allocated to User Equipment (User Equipment, abbreviated as UE) and an optimal transmission direction of a beam, where the optimal transmission direction is a transmission direction with optimal signal quality in the transmission direction of the beam;

the base station sends a Channel State Information-Reference Signal (CSI-RS) dedicated to the UE in the optimal transmitting direction;

the base station receives a CSI measurement report obtained by measuring a UE-specific (UE-specific) CSI-RS dedicated to the UE by the UE;

the base station determines the downlink transmission mode of the UE according to at least one of the following: the base station allocates the number of transmission channels for the UE, the RI value in the CSI measurement report and the beamforming capability information of the UE acquired by the base station.

Optionally, before the base station determines the downlink transmission mode, the method further includes:

the base station sends a request message for requesting to acquire the beamforming capability information to the UE; and the base station receives the beamforming capability information fed back by the UE.

Optionally, the beamforming capability information includes at least one of: the number of the transceiving channels of the UE, the number of the beam directions supported by each transceiving channel, and the dual polarization supporting capability of each transceiving channel.

Optionally, the base station determines the optimal transmission direction of the beam by:

the base station sends a time-frequency resource position allocated to the UE;

the base station receives the uplink reference signals sent by the UE on the time-frequency resource position by the receiving and sending channel number of the UE in different wave beam directions;

the base station acquires signal to interference plus noise ratio (SINR) between different beam pairs according to the uplink reference signal, wherein each beam pair consists of a transmitting beam and a receiving beam;

the base station selects the optimal beam pair corresponding to the maximum value in the SINR; and taking the transmitting direction of the transmitting beam in the optimal beam pair as the optimal transmitting direction.

Optionally, the base station determines the number of downlink transmission channels by:

the base station transmits reference signals or synchronous signals in different beam directions;

the UE receives the transmission reference signals or the synchronization signals in different beam directions and measures SINR values of different beam pairs, wherein each beam pair consists of a transmission beam and a reception beam;

the UE sends the selected candidate beam pair and the SINR value corresponding to the candidate beam pair to a base station; wherein the SINR value of the candidate beam pair is greater than SINR values of other beam pairs in the beam pair received by the UE, the other beam pairs being beam pairs in the beam pair received by the UE other than the candidate beam pair;

and the base station receives the candidate beam pair and the SINR value corresponding to the candidate beam pair, and determines the downlink transmission channel and the number of the downlink transmission channels according to the SINR values of the beam pair reported by other UE in the coverage of the base station.

Optionally, after the base station determines the downlink transmission mode of the UE, the method further includes:

and the base station sends a notice to the UE, wherein the notice is used for informing the UE of the downlink transmission mode.

Optionally, the sending, by the base station, a notification to the UE includes:

the base station sends the notification to the UE through a dedicated information element in a Radio Resource Control (RRC) message; or,

and the base station sends the notification to the UE through a special field in the information carried by the PDCCH.

According to another embodiment of the present invention, there is provided a data transmission method including: the UE receives a notification sent by a base station, wherein the notification is used for notifying the UE of the downlink transmission mode, and the downlink transmission mode is a transmission mode determined by the base station according to at least one of the following conditions: the base station distributes the number of transmitting channels for the UE, the RI value in a CSI measurement report and the beamforming capability information of the UE acquired by the base station; and the UE performs data transmission with the base station according to the downlink transmission mode.

Optionally, before the UE receives the notification sent by the base station, the method further includes:

the UE receives a request message sent by the base station, wherein the request message is used for requesting to acquire the beamforming capability information;

and the UE sends the beamforming capability information to the base station.

Optionally, the receiving, by the UE, the notification sent by the base station includes:

the UE receiving the notification via a dedicated information element in a radio resource control, RRC, message; or,

and the UE receives the notification through a special field in the information carried by the PDCCH.

According to still another embodiment of the present invention, there is provided a transmission mode determination apparatus including: a first determining module, configured to determine the number of downlink channels allocated to a user equipment UE and an optimal transmission direction of a beam, where the optimal transmission direction is a transmission direction with optimal signal quality in the transmission direction of the beam; a sending module, configured to send the UE-specific CSI-RS in the optimal transmission direction; a receiving module, configured to receive a CSI measurement report obtained by the UE measuring the CSI-RS dedicated to the UE; a second determining module, configured to determine a downlink transmission mode of the UE according to at least one of: the base station allocates the number of transmission channels for the UE, the RI value in the CSI measurement report and the beamforming capability information of the UE acquired by the base station.

Optionally, the first determining module is further configured to send, to the UE, a time-frequency resource location allocated to the UE; receiving the uplink reference signals sent by the UE on the time-frequency resource position by the receiving and sending channels of the UE in different wave beam directions by the receiving and sending channels of the base station; acquiring a Signal Interference Noise Ratio (SINR) between different wave beam pairs according to the uplink reference signal; selecting the optimal beam pair corresponding to the maximum value in the SINR; and taking the transmitting direction of the transmitting beam in the optimal beam pair as the optimal transmitting direction, wherein each beam pair consists of a transmitting beam and a receiving beam.

According to still another embodiment of the present invention, there is provided a data transmission apparatus including: a receiving module, configured to receive a notification sent by a base station, where the notification is used to notify the UE of the downlink transmission mode, where the downlink transmission mode is a transmission mode determined by the base station according to at least one of the following: the base station distributes the number of transmitting channels for the UE, the RI value in a CSI measurement report and the beamforming capability information of the UE acquired by the base station; and the transmission module is used for carrying out data transmission with the base station according to the downlink transmission mode.

According to still another embodiment of the present invention, there is provided a communication system including: a base station and User Equipment (UE); the base station is configured to determine the number of downlink channels allocated to the UE and an optimal transmission direction of a beam, where the optimal transmission direction is a transmission direction with the optimal signal quality in the transmission direction of the beam; sending a channel state information reference signal (CSI-RS) dedicated to the UE in the optimal transmission direction; receiving a CSI measurement report obtained by the UE through measuring the CSI-RS special for the UE; and determining a downlink transmission mode of the UE according to at least one of: the base station allocates the number of transmission channels for the UE, the RI value in the CSI measurement report and the beamforming capability information of the UE acquired by the base station; the UE is used for receiving a notification sent by a base station, and the notification is used for notifying the UE of the downlink transmission mode; and carrying out data transmission with the base station according to the downlink transmission mode.

Optionally, the base station is further configured to send, to the UE, a time-frequency resource location allocated to the UE; receiving the uplink reference signals sent by the UE on the time-frequency resource position by the receiving and sending channel number of the UE in different wave beam directions by the receiving and sending channel number of the base station; acquiring Signal Interference Noise Ratio (SINR) between different transmitting-receiving beam pairs according to the uplink reference signal; selecting the optimal beam pair corresponding to the maximum value in the SINR; and taking the transmitting direction of the transmitting beam in the optimal beam pair as the optimal transmitting direction.

According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is configured to store program code for performing the steps of: the base station determines the number of downlink channels allocated to the UE and the optimal transmitting direction of the beam, wherein the optimal transmitting direction is the transmitting direction with the optimal signal quality in the transmitting direction of the beam; the base station sends a channel state information reference signal (CSI-RS) special for the UE in the optimal transmitting direction; the base station receives a CSI measurement report obtained by measuring the CSI-RS special for the UE by the UE; the base station determines the downlink transmission mode of the UE according to at least one of the following: the base station allocates the number of transmission channels for the UE, the RI value in the CSI measurement report and the beamforming capability information of the UE acquired by the base station.

Optionally, the storage medium is further configured to store program code for performing the following steps:

the base station sends a request message for requesting to acquire the beamforming capability information to the UE;

and the base station receives the beamforming capability information fed back by the UE.

the beamforming capability information includes at least one of: the number of the transceiving channels of the UE, the number of the beam directions supported by each transceiving channel, and the dual polarization supporting capability of each transceiving channel.

the base station determines the optimal transmit direction of the beam by:

the base station sends a time-frequency resource position allocated to the UE;

the base station determines the number of the downlink transmitting channels by the following method:

after the base station determines the downlink transmission mode of the UE, the method further includes:

According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is configured to store program code for performing the steps of: the UE receives a notification sent by a base station, wherein the notification is used for notifying the UE of the downlink transmission mode, and the downlink transmission mode is a transmission mode determined by the base station according to at least one of the following conditions: the base station distributes the number of transmitting channels for the UE, the RI value in a CSI measurement report and the beamforming capability information of the UE acquired by the base station; and the UE performs data transmission with the base station according to the downlink transmission mode.

before the UE receives the notification sent by the base station, the method further includes:

and the UE sends the beamforming capability information to the base station.

According to the invention, the special CSI-RS can be sent to the UE in the optimal transmission direction, and the downlink transmission mode is determined by using at least one of the RI value in the measurement report of the CSI-RS, the number of transmission channels allocated to the UE by the base station and the beamforming capability information of the UE, so that the special CSI-RS resource of the UE can be sent to different UEs to accurately measure the downlink channel, and the problem that the determination scheme of the downlink transmission mode in the 5G communication process cannot meet the requirement of high-frequency communication is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic diagram of a hybrid beamforming architecture according to an embodiment of the present invention;

fig. 2 is a flowchart of a method of determining a transmission mode according to an embodiment of the present invention;

fig. 3a is a schematic diagram of an alternative high frequency uplink subframe structure according to an embodiment of the present invention;

fig. 3b is a schematic diagram of an alternative high-frequency downlink subframe structure according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an alternative CSI-RS resource distribution according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a CSI measurement report reporting process according to an alternative embodiment of the present invention;

fig. 6 is a flow chart of transmission mode determination based on the number of downlink channels in an alternative embodiment of the present invention;

fig. 7 is a flowchart of a transmission mode determination based on an RI value reported by a terminal according to an alternative embodiment of the present invention;

fig. 8 is a block diagram of a configuration of a transmission mode determination apparatus according to an embodiment of the present invention;

FIG. 9 is a flow chart of a method of data transmission according to an embodiment of the present invention;

fig. 10 is a block diagram of a data transmission apparatus according to an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Antennas at the base station and the terminal side in high frequency communication generally transmit and receive in a beamforming manner, and different UEs are located on different transmit beams. In Long Term Evolution (Long Term Evolution, LTE for short), the CSI-RS reference signal based on the omni-directional transmission mode cannot meet the requirement of high frequency communication, and resource scheduling for the CSI-RS of the UE becomes an inevitable requirement. In high frequency communication, the UE may determine a transmission mode according to information such as the number of channels available for downlink transmission. In order to achieve the above object, an embodiment of the present invention provides a scheme for determining an issuing and measuring mode and a downlink transmission mode of a UE-specific CSI-RS reference signal in a high frequency frame structure framework, which specifically includes: (1) UE capability based on high frequency multi-antenna and its obtaining method; (2) a base station UE-based CSI-RS resource scheduling method; (3) a terminal based on the measurement and reporting method of UE-specific CSI-RS; (4) a transmission mode determining method of a base station based on the number of available downlink transmitting channels of a terminal; (5) and finally, a method for determining the transmission mode of the base station based on the number of the available transmission channels of the terminal is provided. The details are as follows.

To facilitate understanding of the embodiments of the present application, technical terms referred to in the embodiments of the present application are explained below:

the transmission mode refers to a data transmission method of an antenna port. Can be defined in two ways: defining the number of data streams sent at the same time, such as single stream, double stream, four stream and eight stream; the antenna transmission mode is defined as follows: single antenna port, transmit diversity, multiplexing mechanism.

Example 1

An N x M hybrid beamforming architecture is shown in fig. 1, where there are N transceivers, each connected to M antennas. ABF (Analog Beamforming) operates on M antennas per transceiver, and can be adjusted for the phase of each antenna. DBF (Digital Beamforming) operates N transceivers, and may perform different phase operations for different frequency points. The DAC (Digital Analog Converter) is a Digital-to-Analog Converter, the Mixer in fig. 1 is a signal Mixer, and the PA (Power Amplifier) is a Power Amplifier for each antenna. Antenna 0, Antenna 1, …, Antenna (M-1) respectively represent different antennas of a transceiver, and Sector is a narrow beam. One transceiving chain is configured as one port, or two transceiving chains are configured as one port, which is determined according to the actual situation.

In this embodiment, a method operating in the foregoing architecture is provided, and fig. 2 is a flowchart of a method for determining a transmission mode according to an embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:

step S202, a base station determines the number of downlink channels allocated to User Equipment (UE) and the optimal transmitting direction of a beam, wherein the optimal transmitting direction is the transmitting direction with the optimal signal quality in the transmitting direction of the beam;

optionally, the base station determines the optimal transmission direction of the beam by: the base station sends a time-frequency resource position allocated to the UE; the base station receives the uplink reference signal sent by the UE on the time-frequency resource position by the receiving and sending channel number of the UE in different wave beam directions; the base station acquires a Signal to Interference noise Ratio (SINR) between different beam pairs according to the uplink reference Signal; the base station selects an optimal beam pair corresponding to the maximum value in the SINRs; and using the transmitting direction of the transmitting beam in the optimal beam pair as the optimal transmitting direction, wherein each of the beam pairs consists of a transmitting beam and a receiving beam.

In an optional embodiment, the base station may determine the number of downlink transmission channels by: the base station transmits reference signals or synchronous signals in different beam directions; the UE receives the transmission reference signal or the synchronization signal in different beam directions and measures SINR values of different beam pairs, wherein each beam pair consists of a transmission beam and a reception beam; the UE sends the selected candidate beam pair and the SINR value corresponding to the candidate beam pair to the base station; wherein the SINR value of the candidate beam pair is greater than SINR values of other beam pairs of the beam pairs received by the UE, the other beam pairs being beam pairs of the beam pairs received by the UE other than the candidate beam pair; the base station receives the candidate beam pair and the SINR value corresponding to the candidate beam pair, and determines the downlink transmission channel and the number of the downlink transmission channels according to the SINR values of the beam pair reported by other UEs in the coverage area of the base station, and optionally, may determine the downlink transmission channel allocated to the UE according to the priority of the UE. In an optional embodiment, the downlink transmission channels allocated to different UEs are different, that is, the downlink transmission channels allocated to different UEs are not overlapped.

Step S204, the base station sends the CSI-RS special for the UE in the optimal transmitting direction;

step S206, the base station receives a CSI measurement report obtained by the UE measuring the CSI-RS special for the UE;

step S208, the base station determines the downlink transmission mode of the UE according to at least one of the following: the number of transmission channels allocated by the base station to the UE, the RI value in the CSI measurement report, and the beamforming capability information of the UE acquired by the base station.

Optionally, before the base station determines the downlink transmission mode, the base station may send a request message for requesting to acquire the beamforming capability information to the UE; and the base station receives the beamforming capability information fed back by the UE. And the obtaining of the beamforming capability information may be based on a base station request, and certainly, the UE may also report the beamforming capability information to the base station actively at regular time, and is adjusted flexibly according to actual conditions.

Optionally, after the base station determines the downlink transmission mode of the UE, the base station sends a notification to the UE, where the notification is used to notify the UE of the downlink transmission mode. Optionally, the sending, by the base station, the notification to the UE may be implemented by, but is not limited to: the base station sending the notification to the UE via a dedicated cell in a radio resource control, RRC, message; or, the base station sends the notification to the UE through a dedicated field in downlink control information (e.g., information carried by a PDCCH), where the dedicated field may be a newly added field in the downlink control information, and the downlink control information may be control information carried by a physical downlink control channel.

The scheme in this embodiment may be applied to high frequency communication, and in this case, the high frequency subframe structure is as shown in fig. 3, and includes the following parts: the uplink subframe includes an uplink SRS (Sounding Reference Symbol)/Preamble, an uplink control, an uplink data channel, a GP (Guard Period), and a downlink control. The downlink subframe includes RS (Reference Signal)/PSS (Primary Synchronization Signal)/SSS (secondary Synchronization Signal), downlink control, DMRS (demodulation Reference Signal), downlink data channel, GP, and uplink control, and the uplink control mainly transmits ACK/NACK feedback information. The 1 radio frame contains 10 radio subframes, each subframe containing 2 slots, each slot containing 7-30 Orthogonal Frequency Division Multiplexing (OFDM) symbols. The length of each subframe is 100-250 microseconds.

Optionally, in this embodiment, the CSI-RS resources are distributed as shown in fig. 4, where the downlink DMRS resources are allocated on the first OFDM symbol of the downlink subframe, the Cell CSI-RS is allocated on the immediately adjacent 1 or more OFDM symbols, and the UE-specific CSI-RS is allocated on the subsequent 1 or more OFDM symbols. A downlink control channel PDCCH is allocated on the next 1 or more OFDM symbols, followed by a downlink traffic channel PDSCH.

To facilitate an understanding of the above embodiments, reference is made to the following detailed description in conjunction with fig. 5-7.

Fig. 5 is a schematic diagram of a CSI measurement report reporting process according to an alternative embodiment of the present invention, as shown in fig. 5, the process includes:

step S500: a base station sends a UE Capability request message to UE, and cell BF-Parameters are newly added in UE-EUTRA-Capability; the new BF-Parameters cell includes: the multi-channel multi-beam capability of the antenna and the dual-polarization supporting capability of the channel; the multi-channel multi-beam capability of the antenna is represented by having several transceiving channels RF Chain, each of which supports several transceiving beam IDs (identifiers), such as: RF Chain 1, Rx/Tx Beam ID 1,2, 3; RF Chain 2, Rx/Tx Beam ID 4,5, 6; …, respectively; RF Chain N, Rx/Tx Beam ID 3(N-1) +1,3(N-1) +2,3(N-1) + 3. Dual polarization support capability of the channel: the support or does not support.

Step S501: the UE returning the UE capability information to the base station specifically includes: the number of receiving and transmitting channels at the UE side and the number of beam directions supported by each channel; whether each transceiving channel supports dual polarization capability.

Step S502: when the beam training periodic timer arrives, the base station uniformly sends uplink SRS resource allocation results to the on-line UE, specifically including the time-frequency resource position of the SRS reference signal which can be used by each UE.

Step S503: after receiving the uplink SRS resource allocation message, the UE transmits an uplink SRS reference signal at the SRS time-frequency resource position allocated to the UE; according to the number of the allocated SRS resources, the UE simultaneously transmits SRS signals in a plurality of different beamlet directions.

Step S504: the base station receives the uplink reference signals of the UE in different beam directions of a plurality of transceiving channels simultaneously, and measures the signal to interference noise ratio between different transmitting-receiving beam pairs (each transmitting-receiving beam pair consists of a transmitting beam and a receiving beam).

Step S505: the base station selects the beam pair with the highest SINR value among different transmitting-receiving beam pairs as the optimal transmitting-receiving beam pair of the UE;

alternatively, when considering multiple UEs selecting transmit-receive beam pairs simultaneously, the priorities of the respective UEs should be considered; the UE with high priority firstly selects the optimal transmitting-receiving beam pair, and when a certain transmitting-receiving channel is selected by the UE with high priority, the UE with low priority can only select from the rest transmitting-receiving channels until all the UE select the optimal transmitting-receiving beam pair.

Step S506: the base station informs the UE of the optimal transmitting-receiving beam pair, wherein the beams at the transmitting side and the receiving side are both expressed by (m, n), wherein m represents the number of channels, and n represents the beam direction of the channel; for example, the best transmit beam (0,1) indicates a channel number of 0 and a beam direction number of 1. The value of m is positive integer 1,2, 4, 8, 16, 32 …, and the value of n is 1-32.

Alternatively, the base station only informs the UE of the best receive beam, e.g. (1, 2); the channel number indicating the best reception beam of the UE is 1 and the beam direction number is 2.

Step S507: and the base station sends the UE-specific CSI-RS reference signal in the optimal transmitting beam direction of the UE.

Step S508: the UE receives the UE-specific CSI-RS reference signal in the optimal receive beam direction notified by the base station, and performs Channel Quality Indicator (CQI)/Precoding Matrix Indicator (PMI)/Rank Indicator (RI) measurement, respectively.

Step S509: and after the UE finishes the measurement, sending a CSI measurement report to the base station, wherein the measurement report comprises specific CQI/PMI/RI measured values.

Fig. 6 is a flow chart of transmission mode determination based on the number of downlink channels according to an alternative embodiment of the present invention. As shown in fig. 6, the flow includes the following processing steps:

step S600: the base station and the UE communicate in a transmission mode 1; the transmission mode may be defined mainly by the number of streams, such as single stream, double stream, four streams, eight streams, sixteen streams, thirty-two streams, sixty-four streams, and so on.

Step S601: when a UE scheduling period arrives, the base station selects a plurality of online UEs with higher priority according to a certain scheduling algorithm; the specific scheduling algorithm is as follows: PF, MAX-C/I, RR, and the like.

Step S602: and the base station sends a UE capability request message to the high-priority UE selected by the scheduling algorithm.

Step S603: after receiving the UE capability request message sent by the base station, the UE fills BF-Parameters according to the self beam forming capability and returns the UE capability information to the base station; BF-Parameters contain the following information: the information of the number of the transmission channels supported by the UE, the information of the number of the beam directions supported by each transmission channel and the information of the dual polarization capability of the channel.

Step S604: the base station and the UE perform an uplink beam training process, which is specifically the steps S503-S504 in fig. 5.

Step S605: and the base station establishes a beam pair energy table according to the SINR measurement of different beam pairs, and selects the transmitting-receiving beam pairs meeting the conditions according to a preset SINR threshold value. The following principles are followed when selecting the beam pair: the high priority UE preferentially selects the Tx-Rx beam pair; after each transmission channel is selected by only one UE, that is, the transmission channel is selected by the UE with high priority, other UEs can not select the transmission channel any more.

Step S606: the base station determines a downlink transmission mode of the UE according to the number of downlink channels allocated to the UE and the capability of the UE for receiving antennas; such as: if the number of downlink transmission channels allocated by the base station for the UE is 2, adopting double-current transmission; and if the number of downlink transmission channels allocated by the base station for the UE is 4, adopting four-flow transmission.

Optionally, if the transmitting antenna supports dual polarization capability, the number of downlink transmission channels allocated by the base station to the UE is 2, and then four-stream transmission may be adopted; and if the number of downlink transmission channels allocated by the base station for the UE is 4, adopting eight-stream transmission and the like.

Step S607: the base station informs the UE of the change of the UE transmission mode; the specific notification can use a mode of adding a DCI cell in the PDCCH; the new DCI cell includes a downlink transmission mode indication.

Optionally, the notification is performed by adding a new transmission mode in a RRC layer message physical configdetected- > antenna info detected- > transmission mode information element. Wherein, the "physical configdivided- > tendainfodivided- > transmissionMode cell" indicates that the physical configdivided cell includes the tendainfodivided cell, and the tendainfodivided cell includes the transmissionMode cell.

Step S608: the base station and the UE communicate in transmission mode 2 decided by the base station.

It should be noted that the method shown in fig. 6 is also applicable to determining the uplink transmission mode.

Fig. 7 is a flowchart of a transmission mode determination based on an RI value reported by a terminal according to an alternative embodiment of the present invention. As shown in fig. 7, the flow includes the following processing steps:

step S700: the base station and the UE communicate in a transmission mode 1; the transmission mode may be defined mainly by the number of streams, such as single stream, double stream, four streams, eight streams, sixteen streams, thirty-two streams, sixty-four streams, and so on.

Step S701: the base station sends a UE capability request message to the UE.

Step S702: after receiving the UE capability request message sent by the base station, the UE fills BF-Parameters according to the self beam forming capability and returns the UE capability information to the base station; BF-Parameters contain the following information: the information of the number of the transmission channels supported by the UE, the information of the number of the beam directions supported by each transmission channel and the information of the dual polarization capability of the channel.

Step S703: the base station and the UE carry out a downlink beam training process; the base station circularly scans the transmitting reference signals or the synchronous signals along different beam directions, the UE circularly scans the receiving reference signals or the synchronous signals along different beam directions, and SINR values of different transmitting-receiving beam pairs are measured.

Step S704: UE selects several pairs of transmitting-receiving wave beam pairs with optimal SINR value and SINR measured value to inform base station; the logarithm of the selected transmit-receive beams may be a positive integer of 1,2, 4, etc.

Step S705: and the base station determines a downlink transmitting channel of the base station for the UE according to the transmitting-receiving beam pair and the SINR measured value reported by the UE and the transmitting-receiving beam pair and the SINR measured value reported by other UEs. The determined number of downlink transmission channels may be 1,2, 4, 8 …, etc.

Step S706: and the base station sends the UE-specific CSI-RS reference signal to the UE on the determined downlink transmission channel.

Step S707: the UE performs CQI/PMI/RI measurements for the UE-specific CSI-RS reference signal.

Step S708: and after the CSI measurement is finished, the UE reports a CSI (CQI/PMI/RI) measurement report to the base station.

Step S709: and the base station determines a transmission mode according to the reported CSI measurement report. If RI is 1, single-flow transmission is carried out; if RI is 2, then dual-flow transmission is performed; if RI is 4, then four streams are transmitted, etc.

Step S710: the base station informs the UE of the change of the UE transmission mode; the specific notification can be notified by a way of adding a DCI cell in the PDCCH; the new DCI cell includes a downlink transmission mode indication.

Optionally, the notification is performed by adding a new transmission mode in a RRC layer message physical configdetected- > antenna info detected- > transmission mode information element.

Step S711: the base station and the UE communicate in transmission mode 2 decided by the base station.

It should be noted that the method shown in fig. 7 is also applicable to determining the uplink transmission mode.

In summary, with the above technical solutions in the embodiments of the present invention, compared with the related art: the UE capability information of the terminal in LTE does not include beamforming capability information, and the UE capability information of the terminal in high frequency can accurately describe the specific capability of the UE only if the UE capability information includes beamforming capability information. In high frequency, because the UE is in different geographical positions, different beams are required to be used for scanning, and the UE can accurately measure the downlink channel only when the UE-specific CSI-RS resource is required to be issued for different UEs. The number of streams adopted by the downlink transmission mode in the LTE is judged by the RI reported by the terminal, and the number of channels allocated to the terminal is required to be combined in the high frequency for judgment. In the LTE, a base station informs a terminal of the change of a transmission mode through a high-level RRC signaling, and the embodiment of the invention adopts downlink control information (such as a PDCCH (physical Downlink control channel)) to inform the change of the transmission mode of the terminal so as to accelerate the adjustment of the transmission mode of the terminal and adapt to the characteristic of rapid channel change in a high-frequency scene.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

Example 2

In this embodiment, a device for determining a transmission mode is further provided, where the device is used to implement the foregoing embodiments and preferred embodiments, and details are not repeated for what has been described. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 8 is a block diagram of a configuration of a transmission mode determination apparatus according to an embodiment of the present invention, as shown in fig. 8, the apparatus including:

a first determining module 80, configured to determine the number of downlink channels allocated to the UE and an optimal transmitting direction of a beam, where the optimal transmitting direction is a transmitting direction with the optimal signal quality in the transmitting direction of the beam;

a transmitting module 82, coupled to the first determining module 80, for transmitting the UE-specific CSI-RS in the optimal transmission direction;

a receiving module 84, coupled to the sending module 82, configured to receive a CSI measurement report obtained by measuring the UE-specific CSI-RS;

a second determining module 86, coupled to the receiving module 84, configured to determine a downlink transmission mode of the UE according to at least one of: the number of transmission channels allocated by the base station to the UE, the RI value in the CSI measurement report, and the beamforming capability information of the UE acquired by the base station.

Optionally, the first determining module 80 is further configured to send, to the UE, a time-frequency resource location allocated to the UE; receiving the uplink reference signals sent by the UE on the time-frequency resource position by the receiving and sending channel number of the UE in different wave beam directions by the receiving and sending channel number of the base station; acquiring Signal Interference Noise Ratio (SINR) between different transmitting-receiving beam pairs according to the uplink reference signal; selecting the optimal beam pair corresponding to the maximum value in the SINR; and taking the transmitting direction of the transmitting beam in the optimal beam pair as the optimal transmitting direction.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

It should be noted that, for the preferred implementation in this embodiment, reference may be made to the description in embodiment 1, and details are not described here.

Example 3

The present embodiment provides a data transmission method, which can also operate in the architecture shown in fig. 1, but is not limited to the architecture shown in fig. 1. Fig. 9 is a flowchart of a data transmission method according to an embodiment of the present invention, as shown in fig. 9, the method includes:

step S902, the UE receives a notification sent by a base station, where the notification is used to notify the UE of the downlink transmission mode, where the downlink transmission mode is a transmission mode determined by the base station according to at least one of the following: the base station allocates the number of transmission channels to the UE, an RI value in a CSI measurement report, and beamforming capability information of the UE acquired by the base station, where the CSI measurement report is obtained by the UE measuring a CSI-RS, which is a channel state information reference signal CSI-RS dedicated to the UE and is sent by the base station in an optimal transmission direction;

step S904, the UE performs data transmission with the base station according to the downlink transmission mode.

Optionally, before receiving the notification sent by the base station, the UE may receive a request message sent by the base station, where the request message is used to request the beamforming capability information; and the UE sends the beam forming capability information to the base station.

Optionally, the UE receives the notification through a dedicated cell in a radio resource control RRC message; or, the UE receives the notification through a dedicated field of downlink control information.

It should be noted that, reference may be made to the relevant description in embodiment 1 for a preferred implementation of this embodiment, and details are not described here again.

Example 4

This embodiment provides a data transmission apparatus, and fig. 10 is a block diagram of a data transmission apparatus according to an embodiment of the present invention. As shown in fig. 10, the apparatus includes:

a receiving module 1002, configured to receive a notification sent by a base station, where the notification is used to notify the UE of the downlink transmission mode, where the downlink transmission mode is a transmission mode determined by the base station according to at least one of the following: the base station distributes the number of transmission channels for the UE, an RI value in a CSI measurement report and the beamforming capability information of the UE acquired by the base station, wherein the CSI measurement report is obtained by the UE measuring a UE-specific CSI reference signal (CSI-RS) sent by the base station in the optimal transmission direction;

a transmitting module 1004, coupled to the receiving module 1002, configured to perform data transmission with the base station according to the downlink transmission mode.

Example 5

The present embodiment provides a communication system including: a base station and a UE; wherein,

the base station is configured to determine the number of downlink channels allocated to the UE and an optimal transmission direction of a beam, where the optimal transmission direction is a transmission direction with the highest signal quality in the transmission directions of the beam; transmitting a channel state information reference signal (CSI-RS) dedicated to the UE in the optimal transmission direction; receiving a CSI measurement report obtained by the UE measuring the CSI-RS special for the UE; and determining a downlink transmission mode of the UE according to at least one of: the base station allocates the number of transmission channels for the UE, the RI value in the CSI measurement report and the beamforming capability information of the UE acquired by the base station;

the UE is configured to receive a notification sent by a base station, where the notification is used to notify the UE of the downlink transmission mode; and transmitting data with the base station according to the downlink transmission mode

It should be noted that, for the preferred embodiments in this embodiment, reference may be made to the description in embodiments 1-2, and details are not described here.

Example 6

The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps: the base station determines the number of downlink channels allocated to User Equipment (UE) and the optimal transmitting direction of a beam, wherein the optimal transmitting direction is the transmitting direction with the optimal signal quality in the transmitting direction of the beam; the base station sends the CSI-RS special for the UE in the optimal transmitting direction; the base station receives a CSI measurement report obtained by measuring the CSI-RS special for the UE by the UE; the base station determines the downlink transmission mode of the UE according to at least one of the following: the base station allocates the number of transmission channels for the UE, the RI value in the CSI measurement report and the beamforming capability information of the UE acquired by the base station.

the base station determines the optimal transmit direction of the beam by:

the base station sends a time-frequency resource position allocated to the UE;

Example 7

Embodiments of the present invention also provide another storage medium, which may be configured to store program codes for performing the following steps: the UE receives a notification sent by a base station, wherein the notification is used for notifying the UE of the downlink transmission mode, and the downlink transmission mode is a transmission mode determined by the base station according to at least one of the following conditions: the base station distributes the number of transmitting channels for the UE, the RI value in a CSI measurement report and the beamforming capability information of the UE acquired by the base station; and the UE performs data transmission with the base station according to the downlink transmission mode.

and the UE sends the beamforming capability information to the base station.

Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for determining a transmission mode, comprising:

the base station determines the number of downlink channels allocated to User Equipment (UE) and the optimal transmitting direction of a beam, wherein the optimal transmitting direction is the transmitting direction with the optimal signal quality in the transmitting direction of the beam;

the base station sends a channel state information reference signal (CSI-RS) special for the UE in the optimal transmitting direction;

the base station receives a CSI measurement report obtained by measuring the CSI-RS special for the UE by the UE;

the base station determines the downlink transmission mode of the UE according to at least one of the following: the base station allocates the number of transmission channels for the UE, the rank indication RI value in the CSI measurement report and the beamforming capability information of the UE acquired by the base station.

2. The method of claim 1, wherein before the base station determines the downlink transmission mode, the method further comprises:

3. The method of claim 1, wherein the beamforming capability information comprises at least one of: the number of the transceiving channels of the UE, the number of the beam directions supported by each transceiving channel, and the dual polarization supporting capability of each transceiving channel.

4. The method of claim 1, wherein the base station determines the optimal transmit direction for the beam by:

the base station sends a time-frequency resource position allocated to the UE;

5. The method of claim 1, wherein the base station determines the number of downlink transmission channels by:

6. The method according to any of claims 1 to 5, wherein after the base station determines the downlink transmission mode of the UE, the method further comprises:

7. The method of claim 6, wherein the base station sends a notification to the UE, comprising:

8. A method of data transmission, comprising:

user Equipment (UE) receives a notification sent by a base station, wherein the notification is used for notifying the UE of the downlink transmission mode, and the downlink transmission mode is a transmission mode determined by the base station according to at least one of the following: the base station distributes the number of transmitting channels for the UE, the RI value in a CSI measurement report and the beamforming capability information of the UE acquired by the base station; the CSI measurement report is obtained by measuring a channel state information reference signal (CSI-RS) special for the UE, which is sent by the base station in the optimal transmitting direction;

and the UE performs data transmission with the base station according to the downlink transmission mode.

9. The method of claim 8, wherein before the UE receives the notification sent by the base station, the method further comprises:

and the UE sends the beamforming capability information to the base station.

10. The method of claim 8, wherein the beamforming capability information comprises at least one of: the number of the transceiving channels of the UE, the number of the beam directions supported by each transceiving channel, and the dual polarization supporting capability of each transceiving channel.

11. The method of claim 8, wherein the UE receives the notification sent by the base station, and comprises:

12. An apparatus for determining a transmission mode, comprising:

a first determining module, configured to determine the number of downlink channels allocated to a user equipment UE and an optimal transmission direction of a beam, where the optimal transmission direction is a transmission direction with optimal signal quality in the transmission direction of the beam;

a sending module, configured to send a channel state information reference signal CSI-RS to the UE in the optimal transmission direction;

a receiving module, configured to receive a CSI measurement report obtained by the UE measuring the CSI-RS;

a second determining module, configured to determine a downlink transmission mode of the UE according to at least one of: the base station allocates the number of transmission channels for the UE, the RI value in the CSI measurement report and the beamforming capability information of the UE acquired by the base station.

13. The apparatus of claim 12, wherein the beamforming capability information comprises at least one of: the number of the transceiving channels of the UE, the number of the beam directions supported by each transceiving channel, and the dual polarization supporting capability of each transceiving channel.

14. The apparatus of claim 12, wherein the first determining module is further configured to send the UE a time-frequency resource location allocated for the UE; receiving the uplink reference signals sent by the UE on the time-frequency resource position by the receiving and sending channels of the UE in different wave beam directions by the receiving and sending channels of the base station; acquiring a Signal Interference Noise Ratio (SINR) between different wave beam pairs according to the uplink reference signal; selecting the optimal beam pair corresponding to the maximum value in the SINR; and taking the transmitting direction of the transmitting beam in the optimal beam pair as the optimal transmitting direction, wherein each beam pair consists of a transmitting beam and a receiving beam.

15. A data transmission apparatus, comprising:

a receiving module, configured to receive a notification sent by a base station, where the notification is used to notify the UE of the downlink transmission mode, where the downlink transmission mode is a transmission mode determined by the base station according to at least one of the following: the base station distributes the number of transmission channels for the UE, an RI value in a CSI measurement report and the beamforming capability information of the UE acquired by the base station, wherein the CSI measurement report is acquired by the UE through measuring a CSI-RS (channel State information reference Signal) sent by the base station in the optimal transmission direction;

and the transmission module is used for carrying out data transmission with the base station according to the downlink transmission mode.

16. The apparatus of claim 15, wherein the beamforming capability information comprises at least one of: the number of the transceiving channels of the UE, the number of the beam directions supported by each transceiving channel, and the dual polarization supporting capability of each transceiving channel.

17. A communication system, comprising: a base station and User Equipment (UE); wherein,

the base station is configured to determine the number of downlink channels allocated to the UE and an optimal transmission direction of a beam, where the optimal transmission direction is a transmission direction with the optimal signal quality in the transmission directions of the beam; sending a channel state information reference signal (CSI-RS) dedicated to the UE in the optimal transmission direction; receiving a CSI measurement report obtained by the UE through measuring the CSI-RS special for the UE; and determining a downlink transmission mode of the UE according to at least one of: the base station allocates the number of transmission channels for the UE, the RI value in the CSI measurement report and the beamforming capability information of the UE acquired by the base station;

the UE is used for receiving a notification sent by a base station, and the notification is used for notifying the UE of the downlink transmission mode; and carrying out data transmission with the base station according to the downlink transmission mode.

18. The communication system of claim 17, wherein the beamforming capability information comprises at least one of: the number of the transceiving channels of the UE, the number of the beam directions supported by each transceiving channel, and the dual polarization supporting capability of each transceiving channel.

19. The system according to claim 17, wherein said base station is further configured to send to said UE a time-frequency resource location allocated to said UE; receiving the uplink reference signals sent by the UE on the time-frequency resource position by the receiving and sending channel number of the UE in different wave beam directions by the receiving and sending channel number of the base station; acquiring Signal Interference Noise Ratio (SINR) between different transmitting-receiving beam pairs according to the uplink reference signal; selecting the optimal beam pair corresponding to the maximum value in the SINR; and taking the transmitting direction of the transmitting beam in the optimal beam pair as the optimal transmitting direction.