WO2017219986A1

WO2017219986A1 - Method and apparatus for sending correction signal of antenna channel, and base station

Info

Publication number: WO2017219986A1
Application number: PCT/CN2017/089382
Authority: WO
Inventors: 陆海涛; 李刚; 张峰; 林家军
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-06-22
Filing date: 2017-06-21
Publication date: 2017-12-28
Also published as: CN107528620B; CN107528620A

Abstract

A method for sending a correction signal of an antenna channel. The method comprises: a base station generates a radio frame, the radio frame comprising N sub-frames, each sub-frame comprising M OFDM symbols and P correction signals, each OFDM symbol comprising a cyclic prefix (CP) and OFDM symbol data, and P being less than or equal to M; the base station sends the radio frame to a terminal. The present disclosure also provides an apparatus for sending a correction signal of an antenna channel and a base station.

Description

Correction signal transmitting method, device and base station for antenna channel

Technical field

The present disclosure relates to the field of wireless communication technologies, for example, to a method, an apparatus, and a base station for transmitting a correction signal of an antenna channel.

Background technique

Large-scale antenna array system (Massive MIMO) is one of the key technologies of the fifth generation mobile communication. In the actual large-scale antenna array system, there is a certain error in each RF channel, but the smart antenna core algorithm requires accurate knowledge of the array manifold. Therefore, it is necessary to correct the RF channel of the antenna. Only by detecting and correcting these errors between the RF channels, the smart antenna can effectively control the beam direction and shape to realize intelligent transmission and intelligent reception.

The Long Term Evolution (LTE) wireless communication system is divided into two modes: Time Division Duplexing (TDD) and Frequency Division Duplexing (FDD) according to the duplex mode. For TDD-LTE, it is convenient to implement antenna RF channel correction, because the TDD system uses the same frequency point for uplink and downlink, and there is a guard interval (GP) between the uplink and the downlink. In the GP, the TDD system does not receive or transmit. Therefore, the correction processing of the antenna channel can be performed so as not to affect the normal reception and transmission of the wireless communication data. However, for FDD-LTE, since the uplink and downlink of the FDD system work in parallel using different frequency points, the uplink or downlink processing time is occupied when the correction signal of the antenna channel is transmitted, and the wireless communication data is lost, and the system capacity is reduced.

Therefore, finding a correction signal transmission method that does not consume uplink or downlink service data in FDD-LTE is an urgent problem to be solved.

Summary of the invention

In view of this, the present disclosure provides a method, an apparatus, and a base station for correcting signal transmission of an antenna channel, so as to achieve the purpose of not losing uplink or downlink service data in FDD-LTE.

The technical solution of the present disclosure is implemented as follows:

A method for transmitting a correction signal of an antenna channel, comprising:

Generating a radio frame, the radio frame comprising: N subframes, each subframe comprising M orthogonal frequency division multiplexing OFDM symbols and P correction signals, each OFDM symbol comprising a cyclic prefix CP and OFDM symbol data, wherein N, M and P is a positive integer, P is less than or equal to M;

Send a wireless frame.

Optionally, the correction signal is located before the OFDM symbol.

Optionally, there is a guard interval GP between the correction signal and the OFDM symbol.

Optionally, the radio frame length is 10 ms, N is equal to 10, when the CP is a regular CP, M is equal to 14; when the CP is an extended CP, M is equal to 12.

A correction signal transmitting device for an antenna channel, comprising: a generating module and a sending module, wherein the module is configured to: generate a radio frame, the radio frame comprises: N subframes, each subframe includes M orthogonal frequency division multiplexing OFDM symbol and P correction signals, each OFDM symbol consisting of a cyclic prefix CP and OFDM symbol data, where P is less than or equal to M;

The sending module is set to: send a radio frame.

Optionally, the correction signal is located before the OFDM symbol.

A base station includes a correction signal transmitting device of an antenna channel, and a correction signal transmitting device of the antenna channel includes: a generating module and a sending module,

And a generating module, configured to: generate a radio frame, where the radio frame includes: N subframes, each subframe includes M orthogonal frequency division multiplexing OFDM symbols and P correction signals, and each OFDM symbol is composed of a cyclic prefix CP and OFDM symbol data. Composition, wherein P is less than or equal to M;

The sending module is set to: send a radio frame.

Optionally, the correction signal is located before the OFDM symbol, and the guard interval GP exists between the correction signal and the OFDM symbol.

The embodiment further provides a computer readable storage medium storing computer executable instructions for performing the above method.

The embodiment further provides a base station comprising one or more processors, a memory and one or more programs, the one or more programs being stored in a memory, when executed by one or more processors, Perform the above method.

The embodiment further provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, when the program instructions are executed by a computer Having the computer perform any of the methods described above.

The method, device and base station for correcting signal transmission of an antenna channel provided by the present disclosure generate a radio frame and transmit a radio frame, and the radio frame includes N subframes, each subframe includes M OFDM symbols and P correction signals, and each orthogonal frequency Orthogonal Frequency Division Multiplexing (OFDM) consists of a Cyclic Prefix (CP) and OFDM symbol data, where P is less than or equal to M. Thus, in FDD-LTE, without loss of uplink or The correction signal is sent under the premise of downlink service data, thereby reducing system overhead and improving system throughput.

DRAWINGS

1 is a schematic diagram of a radio frame structure of an LTE system in the related art;

2 is a flowchart of a method for transmitting a correction signal of an antenna channel according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a radio frame according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of another radio frame according to the embodiment; FIG.

FIG. 5 is a schematic structural diagram of an apparatus for transmitting a correction signal of an antenna channel according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of hardware of a base station according to an embodiment of the present disclosure.

detailed description

In each of the embodiments of the present disclosure, it is assumed that the LTE system bandwidth configuration is 20 MHz and the sampling rate is 30.72 MHz. The features of the following embodiments and embodiments may be combined with each other without conflict.

1 is a schematic diagram of a radio frame structure of an LTE system in the related art. As shown in FIG. 1, one radio frame includes 10 subframes, each subframe includes 14 or 12 OFDM symbols, and each OFDM symbol is composed of a CP and an OFDM symbol. Data composition. For a regular CP, each subframe contains 14 OFDM symbols, where the length of the regular CP is 2, which is 4.69 us and 5.21 us respectively; for the extended CP, each subframe contains 12 OFDM symbols, wherein the length of the extended CP is 16.67. Us.

In the radio frame structure of the related art, when FDD-LTE performs antenna channel correction (the above-mentioned antenna channel correction is taken as an example), the terminal needs to transmit an uplink correction signal, and in order to avoid interference to the uplink signal, the uplink correction signal needs to be exclusive. An uplink sounding reference signal (SRS) data, assuming that the SRS signal period of the occupied terminal is 10 ms, one SRS data is reserved for the uplink correction signal for the antenna channel correction processing every 10 ms, and LTE data processing is not possible and therefore increases system overhead.

It should be noted that, according to the LTE protocol, the SRS signal period can also be configured to be 5ms, 20ms, 40ms, 80ms, 160ms, and 320ms, regardless of the configuration period, one SRS data will be occupied during the configuration period, and LTE data processing cannot be performed.

It should be noted that the CP located in front of the OFDM symbol data in the radio frame structure in the related art includes not only the same content as the end of the OFDM symbol data but also a large amount of redundant data. The CP is used to solve the interference between OFDM symbols and the interference between subcarriers caused by multipath delay and timing error. The longer the CP, the longer the maximum multipath delay spread supported, and the corresponding coverage is larger. On the other hand, the longer the CP, the greater the overhead of the system. Therefore, according to the requirements of macro coverage, the LTE system supports two CP lengths, namely regular CP (4.69us or 5.21us) and extended CP (16.67us), and the coverage of the maximum multipath delay can reach several kilometers, but in the future. In the 5G application, the coverage requirement of the communication base station is greatly reduced. For example, the coverage is usually several tens of meters to several hundred meters, so the CP length of the conventional LTE system is greatly wasted.

In this embodiment, according to this feature, the CP length is shortened, so that the CP resource originally occupied by the redundant data can be used to carry the antenna correction signal.

The method for transmitting the correction signal of the antenna channel provided by this embodiment can be used for FDD-LTE. The method for transmitting the correction signal of the antenna channel provided by each embodiment is described below with reference to the accompanying drawings.

FIG. 2 is a flowchart of a method for transmitting a correction signal of an antenna channel according to an embodiment of the present invention. As shown in FIG. 2, the method provided in this embodiment may be performed by a base station, and the method provided in this embodiment includes

steps

110 and 120.

In step 110, a radio frame is generated. The radio frame includes: N subframes, each subframe includes M OFDM symbols and P correction signals, and each OFDM symbol is composed of CP and OFDM symbol data. Where N, M and P are positive integers, and P is less than or equal to M.

The base station generates a radio frame containing the correction signal.

It should be noted that the CP in this embodiment is different from the CP in the radio frame structure of the existing LTE system, and the CP in this embodiment only contains the same content as the data at the end of the OFDM symbol data.

In step 120, a radio frame is transmitted.

When the base station sends a radio frame to the terminal, the base station itself corrects the antenna channel according to the correction signal carried in the radio frame.

The method for transmitting the correction signal of the antenna channel provided in this embodiment is applied to the FDD-LTE, and does not need to occupy the SRS data, but uses the redundant resources of the CP to carry the correction signal, thereby realizing the loss of uplink or downlink service data. The correction signal is sent under the premise, so that the base station can perform antenna channel correction according to the correction signal, thereby reducing system overhead and improving system throughput.

Optionally, the correction signal is located before the OFDM symbol.

FIG. 3 is a schematic structural diagram of a radio frame according to an embodiment of the present invention. As shown in FIG. 3, a radio frame includes N subframes, and each subframe includes M OFDM symbols and P correction signals, and each OFDM symbol is composed of CP and The OFDM symbol data is composed, and the correction signal is located before the OFDM symbol. The correction signal is located before the OFDM symbol, which may mean that each correction signal corresponds to one OFDM symbol, and each correction signal is transmitted in time before the corresponding OFDM symbol.

It should be noted that the sum of the length of the CP and the correction signal is 144Ts or 160Ts or 512Ts, and Ts=1/30.72us, then the sum of the length of the CP and the correction signal is 4.69us or 5.21us or 16.67us, of which 4.69us and 5.21us corresponds to the conventional CP of the LTE system in the related art, and 16.67us corresponds to the extended CP of the LTE system in the related art.

The lengths of the CP and the correction signal are defined as shown in Table 1 below:

Table 1

In the radio frame structure provided by this embodiment, each conventional CP has 48 sample point data as a correction signal, and each 1 ms subframe has 14 regular CPs, and each 1 ms subframe has 672 sample point data. As the correction signal, the length requirement of 512 sample points of the antenna correction signal sequence is satisfied; each extended CP has 128 sample point data as a correction signal, and each 1 ms subframe has 12 regular CPs, and each 1 ms subframe is There are 1536 sample point data that can be used as the correction signal to meet the length requirement of 512 sample points of the antenna correction signal sequence. Therefore, there is no need to additionally occupy OFDM symbol data resources, and it does not need to occupy upper and lower SRS resources, thereby reducing system overhead. Increased throughput.

It should be noted that, in the FDD-LTE, according to the method for transmitting a correction signal of the antenna channel provided by the embodiment, the base station performs the correction processing of the antenna channel at the time of the correction signal, and the terminal does not perform any processing at the time of the correction signal. For the LTE terminal in the related art, the correction signal portion is received, but no processing is performed, and then the OFDM symbol portion is received, and the OFDM symbol is processed by using the CP synchronization processing method in the related art. The data is synchronized, and the CP portion and the correction signal portion are discarded after the OFDM symbol data is synchronized. Therefore, the method for transmitting the correction signal of the antenna channel provided in this embodiment does not affect the processing process of the terminal in the FDD-LTE, and is compatible with the terminal.

In another possible implementation, there is a GP between the correction signal and the OFDM symbol.

It should be noted that the GP in this embodiment is different from the GP on the TDD system, and the GP of the TDD system is used for the correction processing of the antenna channel, and the GP in this embodiment is used for the correction signal and the OFDM symbol. Provide switching protection.

FIG. 4 is a schematic diagram of still another structure of a radio frame according to the embodiment. As shown in FIG. 4, a radio frame includes N subframes, and each subframe includes M OFDM symbols and P correction signals, and each OFDM symbol is configured by a CP. And OFDM symbol data, the correction signal is located before the OFDM symbol, and there is a GP between the correction signal and the OFDM symbol.

It should be noted that the sum of the lengths of the CP, GP and the correction signal is 144Ts or 160Ts or 512Ts, and Ts=1/30.72us, then the sum of the lengths of the CP, GP and the correction signal is 4.69us or 5.21us or 16.67us, Among them, 4.69us and 5.21us correspond to the conventional CP of the LTE system in the related art, and 16.67us corresponds to the extended CP of the LTE system in the related art.

The lengths of the CP, GP, and correction signals are defined as shown in Table 2 below:

Table 2

In the radio frame structure provided by this embodiment, each conventional CP has 48 sample point data as a correction signal, and each 1 ms subframe has 14 regular CPs, and each 1 ms subframe has 672 sample point data. As the correction signal, the length requirement of 512 sample points of the antenna correction signal sequence is satisfied; each extended CP has 128 sample point data as a correction signal, and each 1 ms subframe has 12 regular CPs, and each 1 ms subframe is 1536 sample point data can be used as the correction signal, which satisfies the length requirement of 512 sample points of the antenna correction signal sequence, so there is no need to additionally occupy OFDM symbol data resources, nor The uplink and downlink sounding reference signal SRS resources need to be occupied, thereby reducing system overhead and improving throughput; and adding a GP in the radio frame structure to provide switching protection for the correction signal and the OFDM symbol.

The correction signal transmitting apparatus of the antenna channel provided by this embodiment can be used for FDD-LTE. FIG. 5 is a schematic structural diagram of the apparatus for correcting signal of the antenna channel provided by the embodiment. As shown in FIG. 5, the correction signal transmitting apparatus provided in this embodiment includes: a generating module 50 and a transmitting module 51.

The generating module 50 is configured to: generate a radio frame, where the radio frame includes: N subframes, each subframe includes M OFDM symbols and P correction signals, and each OFDM symbol is composed of CP and OFDM symbol data, where P is smaller than Equal to M; the sending module 51 is configured to: transmit a radio frame.

Optionally, the correction signal is located before the OFDM symbol.

The correction signal transmitting apparatus of the antenna channel provided in this embodiment can be used to perform the method for transmitting the correction signal of the antenna channel provided in this embodiment, and has corresponding functions and technical effects.

In practical applications, the generating module 50 and the transmitting module 51 may each be a Central Processing Unit (CPU), a Micro Processor Unit (MPU), and a Digital Signal Processor (Digital Signal Processor) located in the transmitting device. Processor, DSP) or Field Programmable Gate Array (FPGA) implementation.

The present disclosure further provides a base station, where the base station provided by the present disclosure is applicable to FDD-LTE, the base station includes a correction signal transmitting device of an antenna channel, and the correction signal transmitting device of the antenna channel includes a generating module and a sending module, where the generating module is set to Generating a radio frame, the radio frame includes: N subframes, each subframe includes M OFDM symbols and P correction signals, each OFDM symbol is composed of CP and OFDM symbol data, where P is less than or equal to M; and the sending module is configured to send Wireless frame.

Optionally, the correction signal is located before the OFDM symbol, and there is a G P between the correction signal and the OFDM symbol.

The base station provided in this embodiment can correct the antenna channel according to the correction signal in the radio frame, thereby reducing system overhead and improving system throughput.

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

The present disclosure is described in terms of flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to the present embodiments. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

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 of the flow or in a block or blocks of a flow diagram.

As shown in FIG. 6 , it is a hardware structure diagram of a base station provided by this embodiment. As shown in FIG. 6 , the base station includes: a processor 610 and a memory 620; and may further include a communication unit (Communications). Unit) 630 and bus 640.

The processor 610, the memory 620, and the communication unit 630 can complete communication with each other through the bus 640. The communication unit 630 can be used for information transmission. Processor 610 can invoke logic instructions in memory 620 to perform any of the methods of the above-described embodiments.

The memory 620 can include a storage program area and a storage data area, and the storage program area can store an operating system and an application required for at least one function. The storage data area can store data and the like created according to the use of the base station. Further, the memory may include, for example, a volatile memory of a random access memory, and may also include a non-volatile memory. For example, at least one disk storage device, flash memory device, or other non-transitory solid state storage device.

Moreover, when the logic instructions in memory 620 described above can be implemented in the form of software functional units and sold or used as separate products, the logic instructions can be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present disclosure may be embodied in the form of a computer software product, which may be stored in a storage medium, including a plurality of instructions. A computer device (which may be a personal computer, a server, or a network device, etc.) is caused to perform all or part of the steps of the method described in this embodiment.

The storage medium may be a non-transitory storage medium or a transitory storage medium. The non-transitory storage medium may include: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. medium.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program indicating related hardware, and the program can be stored in a non-transitory computer readable storage medium. When executed, a flow of an embodiment of the method as described above may be included.

Industrial applicability

The method, device and base station for correcting signal transmission of the antenna channel provided by the present disclosure can correct the antenna channel according to the correction signal in the radio frame, thereby reducing system overhead and improving system throughput.

Claims

A method for transmitting a correction signal of an antenna channel, comprising:

Generating a radio frame, the radio frame comprising: N subframes, each of the subframes comprising M orthogonal frequency division multiplexing OFDM symbols and P correction signals, each of the OFDM symbols including a cyclic prefix CP and an OFDM symbol Data, wherein N, M and P are positive integers, P is less than or equal to M;

Sending the radio frame.
The method of claim 1 wherein the correction signal is located before the OFDM symbol.
The method of claim 2 wherein there is a guard interval GP between the correction signal and the OFDM symbol.
The method of claim 1, wherein the radio frame length is 10 ms, N is equal to 10, M is equal to 14 when the CP is a regular CP, and M is 12 when the CP is an extended CP.
A correction signal transmitting device for an antenna channel, comprising: a generating module and a sending module,

The generating module is configured to: generate a radio frame, where the radio frame includes: N subframes, each of the subframes includes M orthogonal frequency division multiplexing OFDM symbols and P correction signals, each of the OFDM The symbol consists of a cyclic prefix CP and OFDM symbol data, where P is less than or equal to M;

The sending module is configured to: send the radio frame.
The apparatus of claim 5 wherein the correction signal is located before the OFDM symbol.
The apparatus of claim 6, wherein a guard interval GP exists between the correction signal and the OFDM symbol.
The apparatus according to claim 5, wherein the radio frame length is 10 ms, N is equal to 10, M is equal to 14 when the CP is a regular CP, and M is 12 when the CP is an extended CP.
A base station includes a correction signal transmitting device of an antenna channel, and the correction signal transmitting device of the antenna channel includes: a generating module and a sending module,

The generating module is configured to generate a radio frame, where the radio frame includes: N subframes, each of the subframes includes M orthogonal frequency division multiplexing OFDM symbols and P correction signals, each of the OFDM symbols Consists of a cyclic prefix CP and OFDM symbol data, where P is less than or equal to M;

The sending module is configured to send the radio frame.
The base station according to claim 9, wherein the correction signal is located before the OFDM symbol, and a guard interval GP exists between the correction signal and the OFDM symbol.
A computer readable storage medium storing computer executable instructions, the computer The instructions are executed to perform the method of any of claims 1-4.