CN107124383B

CN107124383B - Data transmission method and device

Info

Publication number: CN107124383B
Application number: CN201610104044.8A
Authority: CN
Inventors: 刘文豪; 郁光辉; 彭佛才; 王小鹏; 张淑娟
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-02-25
Filing date: 2016-02-25
Publication date: 2021-01-19
Anticipated expiration: 2036-02-25
Also published as: CN107124383A; WO2017143880A1

Abstract

The invention discloses a data transmission method and a device, wherein the method comprises the following steps: acquiring a synchronization signal candidate set, wherein the candidate set comprises at least one synchronization signal; finishing downlink synchronization according to the candidate set; acquiring parameters of a system transmission mode according to the detection result of the downlink synchronization; and performing downlink transmission or uplink transmission according to the parameters of the system transmission mode. In the technical scheme of the invention, the receiver detects the synchronous signal to complete downlink synchronization by acquiring the synchronous signal candidate set, and acquires various parameters of a transmission mode adopted by a communication system according to the synchronous detection result, thereby completing data transmission by using the corresponding transmission mode and parameters.

Description

Data transmission method and device

Technical Field

The present invention relates to communications technologies, and in particular, to a data transmission method and apparatus.

Background

In the future, a wireless communication network needs to meet various access requirements, specifically including high bandwidth, large data volume, low latency, low cost, high reliability, high energy efficiency and the like, which sometimes have mutual constraints, and these requirements do not mean that they are met at the same time in any scene, for example, some services need high reliability but can tolerate some time delay such as transactional operations like finance and the like; some services require a large amount of data but have loose real-time requirements on the data such as FTP (File Transfer Protocol); some services require both large data volumes and real-time, such as remote control, real-time 3D gaming, etc.

In order to support large data volume transmission, the wireless communication system adopts technologies such as high-order MIMO (Multiple-Input Multiple-Output), HARQ (Hybrid Automatic Repeat request), and the like to improve the spectrum efficiency, and the capacity of a unit area is increased by intensive deployment. With technologies such as these, the low band cells are already close to the baseline of spectral efficiency and it is difficult to meet the growing demand for wireless broadband capacity. The cell network needs to consider and utilize the high-frequency spectrum in the next generation evolution process to improve the throughput of the wireless network, but the application mode of the high-frequency spectrum is also various, the high-frequency spectrum is distributed in different countries and different areas, the control limit is different, and the transmission characteristics of different frequency bands are different. In addition, the application of the related art to the high-frequency band communication is limited to special communication fields such as military and the like, but the related application is not available in the civil communication field, and the communication mode and parameter configuration of the high-frequency band communication are in the stage of operation and non-uniformity at present.

There is no related technical solution for how to implement communication using the whole available communication frequency band including the high frequency band in LTE (Long Term Evolution) and subsequent technical Evolution.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a data transmission method and apparatus, which can implement communication by effectively using the entire available frequency band including the high frequency band in LTE and subsequent technical evolution.

In order to achieve the object of the present invention, in a first aspect, an embodiment of the present invention provides a data transmission method, where the method includes:

acquiring a synchronization signal candidate set, wherein the candidate set comprises at least one synchronization signal;

finishing downlink synchronization according to the candidate set;

determining parameters of a system transmission mode according to the detection result of the downlink synchronization;

and performing downlink transmission or uplink transmission according to the parameters of the system transmission mode.

Further, at least one of the following distinguishing features exists between the synchronization signals in different candidate sets: the sequence combinations are not the same; the subcarrier spacing is different; the number of continuous OFDM symbols is different; the synchronization bandwidths are not the same.

Further, the parameter of the system transmission mode includes at least one of the following:

a system bandwidth; a subcarrier spacing; physical broadcast channel PBCH configuration parameters; configuring parameters of a Physical Downlink Control Channel (PDCCH); configuring parameters of uplink access resources; a synchronization channel bandwidth; a pilot position; the number of available subcarriers.

Further, different candidate sets correspond to different frequency bands, and the synchronization signals in the candidate sets at least satisfy one of the following conditions:

the synchronization bandwidth value of the synchronization signal in the candidate set is M × SYNCH _ BW _ basic, where SYNCH _ BW _ basic is a basic synchronization bandwidth, M > 0, and the value of M is determined by detecting the synchronization signal;

the number of OFDM symbols occupied by the synchronization signals in the candidate set is n, and n is a natural number;

and the subcarrier interval corresponding to the synchronous signal in the candidate set is X X δ f, wherein X is more than or equal to 1 and less than or equal to M, X is an integer, and δ f is the basic subcarrier interval.

Furthermore, the value of M corresponding to the first frequency band is an integer greater than or equal to 1, and the value of M corresponding to the second frequency band is a rational number less than or equal to 1.

Further, the first frequency band and the second frequency band use 6GHz as a distinguishing point, the starting frequency point of the first frequency band is greater than or equal to 6GHz, and the terminating frequency point of the second frequency band is less than 6 GHz.

Further, the frequency band f 0: in the frequency band less than 6GHz, the corresponding M value is 1/2^pWherein the value of p is 0,1,2,3, 4;

frequency band f 1: [6GHz, 20 GHz)), corresponding M value of 2^pWherein the value of p is 0,1,2,3,4, 5;

frequency band f 2: [20GHz, 30 GHz)), corresponding M value of 2^pWherein the value of p is 0,1,2,3,4,5,6, 7;

frequency band f 3: [30GHz, 52.6GHz) ] corresponding to M values of2^pWherein the value of p is 0,1,2,3,4,5,6, 7;

frequency band f 4: [52.6GHz, 76GHz]Corresponding M is 2^pWherein the value of p is 0,1,2,3,4,5,6, 7;

frequency band f 5: [80GHz, 90GHz]Corresponding M is 2^pWherein the value of p is 0,1,2,3,4,5,6,7, 8.

Further, δ f is 15 kHz; the SYNCH _ BW _ basic is 1.08 MHz; n is less than or equal to 16.

Further, the acquiring a synchronization signal candidate set includes:

receiving signaling indicating the candidate set; or the like, or, alternatively,

blind detecting synchronization signals from all of the candidate sets of synchronization signals to determine the candidate set.

Further, the configuration parameter of the PBCH includes at least one of: a time domain position, a starting position of which is immediately adjacent to or at a fixed time offset from the synchronization signal; a frequency domain location; a number of persistent orthogonal frequency division multiplexing, OFDM, symbols.

Further, the determining a parameter of a system transmission mode according to the detection result of the downlink synchronization includes:

and determining the number of the OFDM symbols for which the PBCH lasts by detecting the number of the OFDM symbols for which the synchronization signal lasts and a ratio PBCH _ SYNCH, wherein the ratio of the number of the OFDM symbols for which the PBCH lasts to the number of the OFDM symbols for which the synchronization signal lasts is agreed in advance.

Further, the ratiopch _ SYNCH ranges from [1/4,4 ].

Further, when the parameter of the system transmission mode includes a system bandwidth, the method for acquiring the system bandwidth includes at least one of the following:

determining the system bandwidth by detecting the synchronous signal of the central frequency point and the synchronous signal of the bandwidth edge;

determining a system bandwidth according to basic system bandwidths basicBW and M, wherein the value range of the basic system bandwidth basicBW is [1.25MHz, 25MHz ];

the system bandwidth is obtained through high-level signaling;

the system bandwidth is obtained by reading the broadcast information transmitted on the PBCH.

Further, when the parameter of the system transmission mode includes the number of available subcarriers, the method for acquiring the number of available subcarriers includes at least one of:

determining the number of available subcarriers corresponding to the system bandwidth as basicSubCarr M according to the number basicSubCarr of the basic available subcarriers corresponding to the basic system bandwidth basicBW;

and reading the broadcast information transmitted on the PBCH to acquire the number of the available subcarriers.

Further, when the parameters of the system transmission mode include uplink access resource configuration parameters, the method for acquiring the uplink access resource configuration parameters includes:

and determining the initial position of the uplink access resource symbol according to the detected initial symbol of the synchronization signal.

Further, when the parameter of the system transmission mode includes a PDCCH configuration parameter, the determining the parameter of the system transmission mode according to the detection result of the downlink synchronization includes:

and determining the position of the PDCCH according to the identified starting symbol and duration of the synchronization signal.

Further, the performing downlink transmission or uplink transmission according to the parameter of the system transmission mode includes:

and acquiring uplink or downlink configuration parameters of a transmission frame through the PDCCH, and transmitting data according to the configuration parameters of the uplink or downlink channel.

Further, the uplink access resource configuration parameter includes at least one of: the frequency domain position of the uplink access signal and the continuous OFDM symbol number of the uplink access signal; accordingly, the method can be used for solving the problems that,

the method for acquiring the frequency domain position of the uplink access signal comprises the following steps:

determining the frequency domain position of the uplink access signal according to the detected frequency domain position of the synchronization signal;

the method for acquiring the number of continuous OFDM symbols of the uplink access signal comprises the following steps:

and determining the number of continuous OFDM symbols of the uplink access signal according to the number of continuous OFDM symbols of the detected synchronous signal.

determining the frequency domain position of an uplink access signal according to the frequency domain position of the PBCH;

and determining the number of continuous OFDM symbols of the uplink access signal according to the number of continuous OFDM symbols of the PBCH.

In a second aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes:

an obtaining unit, configured to obtain a candidate set of synchronization signals, where the candidate set includes at least one synchronization signal;

a synchronization unit, configured to complete downlink synchronization according to the candidate set;

a determining unit, configured to determine a parameter of a system transmission mode according to the detection result of the downlink synchronization;

and the transmission unit is used for performing downlink transmission or uplink transmission according to the parameters of the system transmission mode.

the subcarrier interval corresponding to the synchronous signals in the candidate set is X X δ f, wherein X is more than or equal to 1 and less than or equal to M, X is an integer, and δ f is the basic subcarrier interval;

Further, in the above-mentioned case,

frequency band f 0: in the frequency band less than 6GHz, the corresponding M value is 1/2^pWherein the value of p is 0,1,2,3, 4;

frequency band f 3: [30GHz, 52.6 GHz)), corresponding M value of 2^pWherein the value of p is 0,1,2,3,4,5,6, 7;

Further, the obtaining unit is specifically configured to:

Further, the determining unit is specifically configured to:

Further, the ratiopch _ SYNCH ranges from [1/4,4 ].

Further, when the parameter of the system transmission mode includes a system bandwidth, the determining unit is specifically configured to:

determining a system bandwidth by at least one of:

the system bandwidth is obtained through high-level signaling;

Further, when the parameter of the system transmission mode includes the number of available subcarriers, the determining unit is specifically configured to:

determining the number of available subcarriers by at least one of:

Further, when the parameter of the system transmission mode includes an uplink access resource configuration parameter, the determining unit is specifically configured to:

Further, when the parameter of the system transmission mode includes a PDCCH configuration parameter, the determining unit is specifically configured to:

Further, the transmission unit is specifically configured to:

Further, the uplink access resource configuration parameter includes at least one of: the frequency domain position of the uplink access signal and the continuous OFDM symbol number of the uplink access signal; correspondingly, the determining unit is specifically configured to:

In a third aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes:

a processor;

a memory for storing processor-executable instructions;

wherein the processor executes instructions for:

finishing downlink synchronization according to the candidate set;

Further, the acquiring a synchronization signal candidate set includes:

Further, the ratiopch _ SYNCH ranges from [1/4,4 ].

the system bandwidth is obtained through high-level signaling;

In a fourth aspect, an embodiment of the present invention provides a terminal, where the terminal includes the data transmission apparatus described in the second aspect or the third aspect, or any optional manner of the second aspect or any optional manner of the third aspect.

In a fifth aspect, an embodiment of the present invention provides a relay node, where the relay node includes the data transmission device described in the second aspect or the third aspect, or any optional manner of the second aspect or any optional manner of the third aspect.

The embodiment of the invention provides a data transmission method and a device, wherein the method comprises the following steps: acquiring a synchronization signal candidate set, wherein the candidate set comprises at least one synchronization signal; finishing downlink synchronization according to the candidate set; acquiring parameters of a system transmission mode according to the detection result of the downlink synchronization; and performing downlink transmission or uplink transmission according to the parameters of the system transmission mode. In the technical scheme of the invention, the receiver detects the synchronous signal to complete downlink synchronization by acquiring the synchronous signal candidate set, and acquires various parameters of a transmission mode adopted by a communication system according to the synchronous detection result, thereby completing data transmission by using the corresponding transmission mode and parameters. Compared with the defects that the system transmission mode is fixed and millimeter wave high frequency band communication is not supported in the prior art, the method and the device can support communication in a millimeter wave high frequency band communication mode and various existing communication modes.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a schematic flow chart of a data transmission method according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the location relationship between related channels and parameters according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

An embodiment of the present invention provides a data transmission method, where based on a receiver side, the receiver may specifically be a user equipment such as a terminal or a relay node, as shown in fig. 1, and the method includes:

step 101, obtaining a synchronization signal candidate set, wherein the candidate set comprises at least one synchronization signal;

102, completing downlink synchronization according to the candidate set;

103, determining parameters of a system transmission mode according to the detection result of the downlink synchronization;

and 104, performing downlink transmission or uplink transmission according to the parameters of the system transmission mode.

Further, step 101 may specifically include:

Further, at least one of the following distinguishing features exists between the synchronization signals in different candidate sets: the sequence combinations are not the same; the subcarrier spacing is different; the number of continuous OFDM (Orthogonal Frequency Division Multiplexing) symbols is different; the synchronization bandwidths are not the same.

a system bandwidth; a subcarrier spacing; PBCH (Physical Broadcast Channel) configuration parameters; a PDCCH (Physical Downlink Control Channel) configuration parameter; configuring parameters of uplink access resources; a synchronization channel bandwidth; a pilot position; the number of available subcarriers.

For example, the PBCH, the PDCCH, the synchronization Channel (Synch) and other related channels and parameters, such as PDSCH (Physical Downlink Shared Channel), PRACH (Physical Random Access Channel), pucch (Physical Uplink Channel), and GP (Guard Period) in the embodiment of the present invention, are shown in fig. 2.

Further, step 103 may specifically include:

and determining the number of the OFDM symbols for which the PBCH lasts by detecting the number of the OFDM symbols for which the synchronization signal lasts and a ratio PBCH _ SYNCH, wherein the ratio of the number of the OFDM symbols for which the PBCH lasts to the number of the OFDM symbols for which the synchronization signal lasts is agreed in advance. Further, the ratiopch _ SYNCH ranges from [1/4,4 ].

Furthermore, the first frequency band and the second frequency band use 6GHz as a distinguishing point, the starting frequency point of the first frequency band is greater than or equal to 6GHz, and the terminating frequency point of the second frequency band is less than 6 GHz.

Illustratively, this can be shown as follows:

the system bandwidth is obtained through high-level signaling;

Further, step 104 may specifically include:

The data transmission method provided by the embodiment of the invention obtains a synchronous signal candidate set, wherein the candidate set comprises at least one synchronous signal; finishing downlink synchronization according to the candidate set; determining parameters of a system transmission mode according to the detection result of the downlink synchronization; and performing downlink transmission or uplink transmission according to the parameters of the system transmission mode. In the technical scheme of the invention, the receiver detects the synchronous signal to complete downlink synchronization by acquiring the synchronous signal candidate set, and acquires various parameters of a transmission mode adopted by a communication system according to the synchronous detection result, thereby completing data transmission by using the corresponding transmission mode and parameters. Compared with the defects that the system transmission mode is fixed and millimeter wave high frequency band communication is not supported in the prior art, the method and the device can support communication in a millimeter wave high frequency band communication mode and various existing communication modes.

In order to make the technical solutions provided by the present invention more clearly understood by those skilled in the art, the technical solutions provided by the present invention are described in detail below by specific examples:

the receiver acquires a synchronization signal candidate set, detects a synchronization signal according to the synchronization signal candidate set to complete downlink synchronization, and can determine parameters such as system bandwidth, system sampling rate, Fast Fourier Transform (FFT) point number, uplink/downlink configuration, PBCH, PDCCH, and uplink and downlink channel configuration by detecting the frequency domain position of the synchronization signal.

The receiver successfully detects the synchronization candidate set, firstly determines the sampling rate of the system, can detect the center frequency point of the system bandwidth and the synchronization signal of the bandwidth edge, and determines the system bandwidth, and the method is more, for example, it can preliminarily judge whether the synchronization signal exists at the bandwidth edge by detecting the sequence (hereinafter referred to as synchronization sequence) corresponding to the synchronization signal of the center frequency point of the bandwidth to determine the system bandwidth; or the system bandwidth may be determined by detecting the number of OFDM symbols and/or the synchronization sequence for which the synchronization signal lasts, as exemplified below: suppose that the synchronization sequence A correspondingly represents the system bandwidth as BW _ A, and the sequence B correspondingly represents the system bandwidth BW _ B; or assuming that the continuous OFDM symbol number of the synchronization signal is a and correspondingly represents that the system bandwidth is BW _ a, and the continuous OFDM symbol number is b and correspondingly represents that the system bandwidth is BW _ b; or the mapping relation is established between the synchronization sequence and the continuous OFDM symbol number of the synchronization signal after the synchronization sequence and the continuous OFDM symbol number of the synchronization signal are combined, so that the system bandwidth can be determined by determining the combination mode.

The acquisition mode of the system bandwidth may also be notified by PBCH, the position of PBCH is defined by the synchronization signal, the number of continuous OFDM symbols of PBCH may also be implicitly mapped, for example, by the number of continuous OFDM symbols of the synchronization signal, a fixed proportional relationship may exist, and the aforementioned mapping or proportional relationship may also have an agreed relationship with a specific frequency band.

The mapping relationship between the synchronization signal and the PBCH may be that the receiver attempts to demodulate the PBCH on one or more OFDM symbols immediately after the synchronization signal according to a predetermined manner, and determines the number of OFDM symbols on which the PBCH lasts through a Cyclic Redundancy Check (CRC).

In order to reduce the complexity of acquiring the PBCH, the PBCH with the corresponding symbol number can be tried to be demodulated according to the proportion relation between the agreed continuous OFDM symbol number of the synchronization signal and the continuous OFDM symbol number of the PBCH, the resource position of the PBCH is determined according to the CRC check result, and the PBCH is further extracted.

The receiver determines the number of FFT points and the subcarrier interval according to the synchronization signal candidate set so as to determine the sampling rate, and the determination of the synchronization signal candidate set can occur in a switching stage and can be notified to the receiver by a current serving cell through signaling.

The acquisition of the candidate set of the synchronization signal may also occur at the time of initial startup of the receiver, at this time, the receiver determines the candidate set of the synchronization signal according to the local database, and the receiver preferentially identifies the synchronization signal by using the database stored in the local database.

In the initial start-up phase, the receiver has no prior information and the receiver needs to exhaust all the synchronization signals of the candidate set to determine the system transmission mode. In order to reduce the complexity of the receiver, only the corresponding candidate set may be detected at a specific frequency point in an agreed manner, for example, the sampling rate corresponding to the frequency point f1 is N1 fs _ basic, where N1 is the candidate sampling rate scaling factor corresponding to the frequency point f1, and fs _ basic is the basic sampling frequency corresponding to the frequency point f 1.

In order to further simplify the detection, the receiver detects the synchronous signals according to the constant basic sampling rate fs _ const of all the frequency points, the basic sampling rate of all the frequency points is constant, and only the candidate scaling factor Nx of the corresponding frequency point fx is traversed.

The OFDM-based communication system has a sampling frequency fs of FFTsize × δ f, where FFTsize is the number of FFT points for OFDM modulation, and δ f is the subcarrier spacing. To simplify the complexity of the receiver, N1 times of the subcarrier spacing may be agreed as candidate subcarrier spacing, i.e., fixed FFTsize determines the system sampling frequency by trying the subcarrier spacing.

For an OFDM communication system, FFTsize and δ f are determined, i.e., OFDM symbols where data is correlated at a sampling rate of fs to detect a synchronization signal.

The receiver determines the position of the uplink access signal according to the detected position of the downlink synchronization signal, for example, the receiver determines the starting position of the uplink access signal according to the starting position of the resource position subframe or frame of the downlink access signal, and further according to an agreed relationship (for example, a fixed offset value).

The receiver determines the duration of the downlink access signal according to the detected downlink synchronization signal, for example, the duration of the downlink synchronization is T1, the duration of the uplink access is T1 × Tcomp, wherein Tcomp is the link compensation of uplink transmission, the value of Tcomp is different values selected according to the deployment environment, when the deployment environment is a small coverage area, Tcomp is less than or equal to 1, and when the deployment environment is a large coverage area, Tcomp is greater than or equal to 1.

Example 1:

the receiver accesses the macro cell, the receiver acquires a synchronization signal candidate set of a high-frequency site to be accessed through a high-level signaling of the macro cell, and the receiver acquires the synchronization signal candidate sets corresponding to a plurality of frequency bands. The receiver carries out synchronous detection by using a synchronous signal candidate set of a corresponding frequency band, and the identification of a central frequency point, a synchronous signal bandwidth, a scaling factor M (M is named as a scaling factor for convenience of description), a subcarrier interval and the number of OFDM symbols for the continuation of a synchronous signal is completed through the process. The receiver can further determine other contents of the system transmission mode according to the information, and the other contents are embodied in various sub-embodiments.

Sub-example 1:

the receiver acquires a synchronization signal candidate set of a corresponding frequency band through a high-level signaling of a macro cell, and also acquires the number of continuous OFDM symbols of the synchronization signal used for synchronizing a target cell and a candidate value of a scaling factor M through the signaling. The receiver detects the synchronous signals according to the appointed basic subcarrier interval 15kHz and the scaling factor M in the candidate set, and the receiver can obtain the scaling factor M, the synchronous signal bandwidth and the number of OFDM symbols for the continuation of the synchronous signals after the downlink synchronization is completed.

The synchronization signal candidate set is shown in the following table:

the receiver identifies the frequency band where the maximum correlation peak appears at 20GHz through synchronous detection, and detects that the scaling factor M is 16. The method specifically comprises the following steps: and the receiver filters data outside the candidate frequency band, the filtered time domain data is correlated with a known local sequence, the candidate bandwidth with the maximum synchronous bandwidth correlation peak is determined as the actual synchronous bandwidth by comparing the correlation peaks, and the corresponding M is the detected scaling factor.

The receiver can determine the subcarrier spacing of the transmission system to be 15 × 16kHz, according to the scaling factor M being 16. The terminal determines that the system bandwidth is 20 × 16 — 320MHz according to the agreed basic bandwidth of 20MHz and the scaling factor of 16.

Sub-example 2:

the receiver acquires the synchronization signal candidate set of the corresponding frequency band through the high-level signaling of the macro cell, and also acquires the number of continuous OFDM symbols of the synchronization signal used for synchronizing the target cell, the candidate value of the scaling factor M and the position where the synchronization signal is likely to appear through the high-level signaling. The receiver detects the synchronous signals according to the appointed basic subcarrier interval 15kHz and the scaling factor M in the candidate set, and the receiver can obtain the scaling factor M, the synchronous signal bandwidth and the number of OFDM symbols for the continuation of the synchronous signals after the downlink synchronization is completed.

The synchronization signal candidate set is shown in the following table:

the possible position indication information of the synchronous signal of the non-central carrier frequency is N₁：

Bandwidth MHz	N₁
		100	25
200	50
		400	100
800	200

The receiver identifies a scaling factor M after synchronizing with the central frequency point, and determines the possible position of a synchronizing signal of a non-central carrier frequency position according to the scaling factor M acquired from the signaling: f. of_center±N₁*M*1.08MHz

The receiver identifies the frequency band where the maximum correlation peak appears at 20GHz through synchronous detection, and detects that the scaling factor M is 16.

The receiver firstly detects that no synchronous signal is detected at the position of 20GHz shift +/-25 +/-16 +/-1.08 MHz of the central frequency point according to the scaling factor M & lt 16 & gt, then detects the synchronous signal at the position of the central frequency point shift +/-50 +/-16 +/-1.08 MHz, and judges that the system bandwidth is 200MHz according to the value relation between the bandwidth and N1.

The receiver receives the information carried in the PDCCH over the whole bandwidth, and the contents of each field of the PDCCH may be as follows:

the PDCCH includes configuration information of uplink access, common notification information, and scheduling information of uplink data transmission. The synchronous signal and the control signal have an appointed timing relationship, the receiver determines the position of the PDCCH by positioning the synchronous signal, the receiver firstly performs uplink access according to the acquired parameters of uplink access resource configuration, and detects a control message at the later time to judge whether downlink data arrives and scheduling information authorized by the uplink data performs corresponding downlink receiving and uplink data sending. The method specifically comprises the following steps: and after the receiver finishes sending the uplink access signal, starting a time window, and detecting the PDCCH in the time window, wherein the PDCCH comprises a response of the uplink access signal, and the uplink access response comprises the allocation of uplink resources. The timing relation between the uplink access response of the base station and the uplink access signal sent by the receiver is not strictly determined in a certain subframe, so that the receiver detects in an access response time window when receiving the uplink access response information, if the access response contains the access signal of the receiver, the access response message is scrambled by a specific ID (for example, a cell radio network identifier C-RNTI (radio network identifier C-RNTI) of the receiver, and the receiver descrambles by using the specific ID and considers that the access response information is sent by the receiver if the CRC passes.

Sub-example 3

The synchronization signal candidate set is shown in the following table:

the receiver judges the system bandwidth according to the possible sequence combination of the synchronous signals, identifies the number n of continuous OFDM symbols of the synchronous signals in the synchronization process, and then judges the bandwidth according to the sequence combination condition of the synchronous signals. As shown in the following table:

the receiver identifies that the maximum correlation peak appears in the 30GHz frequency band through synchronous detection, and detects that the scaling factor M is 16. The receiver finds that the sequence combinations are 5,6,7 and 8 by detecting the number n of the continuous symbols of the detected synchronous signal, and finally confirms that the system bandwidth is M20-16 20-320 (MHz).

The combinations of scale factors and frequency bands and the combinations of the numbers and sequences of the continuous symbols of different synchronization signals in the above embodiments are merely illustrative of the identification of the transmission modes achieved by synchronization according to the present invention, and are not specifically limited to these combinations.

Example 2:

the receiver is connected in a high-frequency coverage area, and the receiver detects all synchronous signal candidate sets (namely blind detection synchronous signals) of the high-frequency sites according to convention. The receiver selects different synchronous signal candidate sets to carry out synchronous detection according to convention at different frequency points, and the synchronous detection process completes the identification of the central frequency point, the synchronous signal bandwidth, the scaling factor M, the subcarrier interval and the number of OFDM symbols for the synchronous signal duration. The receiver can further determine the configuration of other channels and signals according to the information, and the specific process is embodied in each sub-embodiment.

Sub-example 1:

the receiver carries out synchronous detection according to the synchronous signal candidate sets corresponding to different frequency bands, and the synchronous signal candidate sets corresponding to the appointed frequency bands are distinguished from the following aspects: the number of continuous OFDM symbols of different synchronization signals, the value of different scaling factors M, the value of different basic subcarrier intervals delta f and the value of different basic synchronization bandwidths SYNCH _ BW _ basic.

The receiver detects the synchronous signals according to the appointed basic subcarrier interval delta f and the scaling factor M in the synchronous signal candidate set, and the receiver can obtain the central frequency point of the synchronous signals, the scaling factor M, the synchronous signal bandwidth and the number of OFDM symbols for the synchronous signals after downlink synchronization is completed.

The synchronization signal candidate set is shown in the following table:

the receiver identifies the frequency band where the maximum correlation peak appears at 20GHz through synchronous detection, and detects that the scaling factor M is 16. And the receiver determines the number of continuous OFDM symbols of the PBCH according to the number of continuous OFDM symbols of the synchronization signal, and determines the position of the time-frequency resource where the PBCH is located according to the timing relationship agreed by the synchronization signal and the PBCH. The receiver extracts the system message by reading the broadcast message. And reading parameters such as system bandwidth, uplink access resource configuration and the like through the PBCH receiver.

And the receiver sends the uplink access signal on the appointed resource according to the content acquired by the PBCH.

The receiver receives the system broadcast message to confirm the corresponding relation between the uplink access signal and the access response resource, and detects the uplink access response message on the detection window according to the corresponding relation.

And the receiver blindly detects the uplink access response message on the whole bandwidth.

And the receiver determines subsequent uplink transmission resources according to the access response message to perform subsequent uplink data transmission and downlink data reception.

Sub-example 2:

The synchronization signal candidate set is shown in the following table:

the receiver identifies that the maximum correlation peak appears in the frequency band where 80GHz is located through synchronous detection, and detects that the scaling factor M is 64. And the receiver determines the number of continuous OFDM symbols of the PBCH according to the number of continuous OFDM symbols of the synchronization signal, and determines the position of the time-frequency resource where the PBCH is located according to the timing relationship agreed by the synchronization signal and the PBCH. The receiver extracts the system message by reading the broadcast message. And reading parameters such as system bandwidth, uplink access resource configuration and the like through the PBCH receiver.

And the receiver receives the PDCCH on the frequency domain resource corresponding to the uplink access signal.

And the receiver reads the access response message in the PDCCH to determine the uplink data transmission and the downlink data reception performed by the uplink transmission resource.

The location of the receiver access resource frequency domain resource and the location of the control channel frequency domain resource carrying the access response in the above embodiments are only one way to illustrate that the present invention identifies the UE specific control channel through the uplink access resource. The correspondence is not unique and is not specifically limited to the combinations, and other ways also include establishing a relationship between a control channel carrying the access response resource and the cell ID, for example, frar ═ (frach + bwrachii) mod BW, that is, frar represents a frequency domain position carrying the RAR, frach represents a frequency domain position where an uplink access signal is located, bwrach represents a random access bandwidth, represents a cell ID cell IDBW represents a bandwidth, and mod represents a modulo operation.

Sub-example 3:

the receiver carries out synchronous detection according to the synchronous signal sets appointed by different frequency bands, and the synchronous signal candidate sets corresponding to the appointed frequency bands are distinguished from the following aspects: the number of continuous OFDM symbols of different synchronization signals, the value of different scaling factors M, the value of different basic subcarrier intervals delta f and the value of different basic synchronization bandwidths SYNCH _ BW _ basic.

The synchronization signal candidate set is shown in the following table:

the receiver identifies that the maximum correlation peak appears in the frequency band where 10GHz is located through synchronous detection, and detects that the scaling factor is 16. The receiver determines the number of PBCH continuous OFDM symbols nsympbch 4 according to the number of synchronization signal continuous symbols n 4 and ratiopch _ SYNCH 1. The method specifically comprises the following steps: the method is that the receiver correlates the data of the bandwidth of the synchronous signal of each OFDM symbol with a local sequence respectively, the correlation values corresponding to each OFDM symbol are accumulated, when the accumulation of the correlation values contributes to the signal, a certain OFDM symbol is considered to bear the synchronous signal, if the accumulated correlation peak value contributes very little, the OFDM symbol is considered to be noise, and the OFDM symbol is judged not to bear the synchronous signal. The accumulation of the correlation peaks of different OFDM symbols can be synchronized to know which OFDM symbol accumulated values mainly contribute to the correlation peaks, and the number of OFDM symbols occupied by the synchronization signal, namely the number of continuous OFDM symbols of the synchronization signal, can be judged.

And the receiver determines the position of the time-frequency resource where the PBCH is located according to the synchronization signal and the timing relation appointed by the PBCH. The receiver extracts the system message by reading the broadcast message. The subsequent procedure for reading system information by the PBCH receiver refers to sub-embodiments 1,2 of this embodiment.

Sub-example 4:

the receiver carries out synchronous detection according to the synchronous signal candidate sets corresponding to different frequency bands, and the synchronous signal candidate sets corresponding to the appointed frequency bands are distinguished from the following aspects: the number of continuous OFDM symbols of different synchronous signals, the value of different scaling factors M, the value of different basic subcarrier intervals delta f and the value of different basic synchronous bandwidths SYNCH _ BW _ basic

The receiver identifies that the maximum correlation peak appears in the frequency band where 10GHz is located through synchronous detection, and detects that the scaling factor is 16. The receiver determines the number of PBCH continuous OFDM symbols nsympbch 4 according to the number of synchronization signal continuous symbols n 4 and ratiopch _ SYNCH 1.

And the receiver determines the position of the time-frequency resource where the PBCH is located according to the synchronization signal and the timing relation appointed by the PBCH. The receiver extracts the system message by reading the broadcast message. And reading configuration information such as system bandwidth, uplink access resource configuration, the number of available subcarriers and the like by the PBCH receiver.

And the receiver reads the access response message in the PDCCH and determines uplink transmission resources according to the number of the available subcarriers to perform uplink data transmission and downlink data reception.

Example 3:

the receiver blind detects the synchronous signals from all the synchronous signal candidate sets, identifies the cells according to the synchronous signals, and positions the duration of uplink access according to the synchronous signals.

Sub-example 1:

the receiver carries out synchronous detection according to the synchronous signal candidate sets appointed by different frequency bands, and the synchronous signal candidate sets corresponding to the appointed frequency bands are distinguished from the following aspects: the number of continuous OFDM symbols of different synchronization signals, the value of different scaling factors M, the value of different basic subcarrier intervals delta f and the value of different basic synchronization bandwidths SYNCH _ BW _ basic.

The receiver detects the synchronous signals according to the appointed basic subcarrier interval delta f and the scaling factor M in the synchronous signal candidate set, and the receiver can obtain the central frequency point of the synchronous signals, the scaling factor M, the synchronous signal bandwidth and the number of the synchronous signal continuous OFDM symbols after downlink synchronization is completed.

The receiver identifies that the maximum correlation peak appears in the frequency band where 10GHz is located through synchronous detection, and detects that the scaling factor M is 16. The receiver determines the number of PBCH continuous OFDM symbols nsympbch 4 according to the number of synchronization signal continuous symbols n 4 and ratiopch _ SYNCH 1.

The receiver determines that the number of the continuous symbols of the uplink access channel sent by the receiver is nSymbpreamble 4 according to the number of the detected continuous OFDM symbols of the PBCH; the receiver repeats the same access sequence over 4 symbols. Commonly used sequences are ZC sequences or pseudo-random sequences.

Sub-example 2:

And the receiver determines the position of the time-frequency resource where the PBCH of the broadcast channel is located according to the timing relation agreed by the synchronous signal and the PBCH. The receiver extracts the system message by reading the broadcast message. And reading configuration information such as system bandwidth, uplink access resource configuration, the number of available subcarriers and the like by the PBCH receiver.

The receiver determines that the number of the continuous symbols of the uplink access channel sent by the receiver is nSymbpreamble 4 according to the number of the detected continuous OFDM symbols of the BCH; the receiver repeats the same access sequence over 4 symbols. Commonly used sequences are ZC sequences or pseudo-random sequences.

In summary, in the method, apparatus or system, in the present invention, the terminal covers the uplink reception beam group based on the difference of the time domain resource set and/or the difference of the frequency domain resource set and/or the difference of the uplink access signal sequence by predefining or receiving the broadcast message and/or the higher layer signaling. The base station selects a time domain resource set and/or a frequency domain resource set and/or a used sequence in which the uplink access signal is determined to obtain the uplink access signal sent by the receiver, and sends an uplink access response message after the uplink access signal is successfully received. The uplink access response message may carry an uplink access signal quality indication bit and uplink access quality. In this way, the terminal can obtain the uplink transmission beam or the optimal uplink transmission beam meeting the uplink transmission, and the base station can select the beam meeting the uplink reception or the optimal uplink reception beam, thereby ensuring the reliable transmission of the subsequent information.

An embodiment of the present invention provides a data transmission apparatus 10, as shown in fig. 3, including:

an obtaining unit 11, configured to obtain a candidate set of synchronization signals, where the candidate set includes at least one synchronization signal;

a synchronization unit 12, configured to complete downlink synchronization according to the candidate set;

a determining unit 13, configured to determine a parameter of a system transmission mode according to the detection result of the downlink synchronization;

and a transmission unit 14, configured to perform downlink transmission or uplink transmission according to the parameter of the system transmission mode.

Further, in the above-mentioned case,

Further, the obtaining unit 11 is specifically configured to:

Further, the determining unit 13 is specifically configured to:

determining a system bandwidth by at least one of:

the system bandwidth is obtained through high-level signaling;

determining the number of available subcarriers by at least one of:

Further, the transmission unit 14 is specifically configured to:

The present embodiment is used to implement the above method embodiments, and the working process and the working principle of each unit in the present embodiment refer to the description in the above method embodiments, which are not described herein again.

The data transmission device provided by the embodiment of the invention acquires a synchronous signal candidate set, wherein the candidate set comprises at least one synchronous signal; finishing downlink synchronization according to the candidate set; acquiring parameters of a system transmission mode according to the detection result of the downlink synchronization; and performing downlink transmission or uplink transmission according to the parameters of the system transmission mode. In the technical scheme of the invention, the receiver detects the synchronous signal to complete downlink synchronization by acquiring the synchronous signal candidate set, and acquires various parameters of a transmission mode adopted by a communication system according to the synchronous detection result, thereby completing data transmission by using the corresponding transmission mode and parameters. Compared with the defects that the system transmission mode is fixed and millimeter wave high frequency band communication is not supported in the prior art, the method and the device can support communication in a millimeter wave high frequency band communication mode and various existing communication modes.

An embodiment of the present invention provides a terminal, including the data transmission device 10.

An embodiment of the present invention provides a relay node, including the data transmission device 10.

The embodiment of the invention also provides a storage medium. Alternatively, in this embodiment, the storage medium may be configured to store program codes for executing the steps of any one of the method embodiments.

Optionally, the storage medium is further arranged to store program code for performing the steps of any of the above described method embodiments.

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, in this embodiment, the processor executes the steps of the above-described embodiment method according to the program code stored in the storage medium.

Optionally, the specific example in this embodiment may refer to the example described in any of the method embodiments and the optional implementation manners, and this embodiment is not described herein again.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A method of data transmission, comprising:

finishing downlink synchronization according to the candidate set;

performing downlink transmission or uplink transmission according to the parameters of the system transmission mode;

wherein the parameter of the system transmission mode comprises at least one of the following parameters:

a system bandwidth; a subcarrier spacing; physical broadcast channel PBCH configuration parameters; configuring parameters of a Physical Downlink Control Channel (PDCCH); configuring parameters of uplink access resources; a synchronization channel bandwidth; a pilot position; the number of available subcarriers;

the downlink transmission or the uplink transmission according to the parameters of the system transmission mode comprises the following steps:

acquiring uplink or downlink configuration parameters of a transmission frame through the PDCCH, and transmitting data according to the configuration parameters of the uplink or downlink channel;

the acquiring, by the PDCCH, the uplink or downlink configuration parameters of the transmission frame, and transmitting data according to the configuration parameters of the uplink or downlink channel includes:

and determining uplink data transmission and downlink data reception performed by the uplink transmission resource by reading the access response message in the PDCCH.

2. The method of claim 1, wherein at least one of the following distinguishing features exists between synchronization signals in different candidate sets: the sequence combinations are not the same; the subcarrier spacing is different; the number of continuous OFDM symbols is different; the synchronization bandwidths are not the same.

3. The method of claim 1, wherein different candidate sets correspond to different frequency bands, and wherein the synchronization signals in the candidate sets satisfy at least one of the following conditions:

4. The method of claim 3, wherein the value of M corresponding to the first frequency band is an integer greater than or equal to 1, and the value of M corresponding to the second frequency band is a rational number less than or equal to 1.

5. The method of claim 4, wherein the first frequency band and the second frequency band are classified by 6GHz, the start frequency point of the first frequency band is greater than or equal to 6GHz, and the end frequency point of the second frequency band is less than 6 GHz.

6. The method of claim 5,

7. The method of claim 3, wherein δ f is 15 kHz; the SYNCH _ BW _ basic is 1.08 MHz; n is less than or equal to 16.

8. The method of claim 1, wherein obtaining the synchronization signal candidate set comprises:

9. The method of claim 1, wherein the configuration parameters of the PBCH comprise at least one of: a time domain position, a starting position of which is immediately adjacent to or at a fixed time offset from the synchronization signal; a frequency domain location; a number of persistent orthogonal frequency division multiplexing, OFDM, symbols.

10. The method according to claim 9, wherein the determining the parameter of the system transmission mode according to the detection result of the downlink synchronization comprises:

11. The method of claim 10, wherein the ratiopch _ SYNCH ranges from [1/4,4 ].

12. The method according to claim 3, wherein when the parameter of the system transmission mode includes a system bandwidth, the method for acquiring the system bandwidth includes at least one of:

the system bandwidth is obtained through high-level signaling;

13. The method according to claim 12, wherein when the parameter of the system transmission mode includes the number of available subcarriers, the method for acquiring the number of available subcarriers includes at least one of:

14. The method according to claim 1 or 3, wherein when the parameters of the system transmission mode include uplink access resource configuration parameters, the method for acquiring the uplink access resource configuration parameters includes:

15. The method according to claim 1 or 3, wherein when the parameter of the system transmission mode includes a PDCCH configuration parameter, the determining the parameter of the system transmission mode according to the detection result of the downlink synchronization includes:

16. The method of claim 1, wherein the uplink access resource configuration parameter comprises at least one of: the frequency domain position of the uplink access signal and the continuous OFDM symbol number of the uplink access signal; accordingly, the method can be used for solving the problems that,

17. The method of claim 9, wherein the uplink access resource configuration parameter comprises at least one of: the frequency domain position of the uplink access signal and the continuous OFDM symbol number of the uplink access signal; accordingly, the method can be used for solving the problems that,

18. A data transmission apparatus, comprising:

a transmission unit, configured to perform downlink transmission or uplink transmission according to the parameter of the system transmission mode;

the transmission unit is specifically configured to:

19. The apparatus of claim 18, wherein at least one of the following distinguishing features exists between synchronization signals in different candidate sets: the sequence combinations are not the same; the subcarrier spacing is different; the number of continuous OFDM symbols is different; the synchronization bandwidths are not the same.

20. The apparatus according to claim 18, wherein the obtaining unit is specifically configured to:

21. The apparatus according to claim 18, wherein the determining unit is specifically configured to: