CN107645758B

CN107645758B - Access signal receiving and sending method and device

Info

Publication number: CN107645758B
Application number: CN201610587315.XA
Authority: CN
Inventors: 黄秋萍; 高秋彬; 陈润华; 王蒙军; 李辉; 拉盖施; 宋扬; 李传军; 苏昕; 杨宇
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-07-22
Filing date: 2016-07-22
Publication date: 2020-03-24
Anticipated expiration: 2036-07-22
Also published as: CN107645758A

Abstract

The invention discloses a method and a device for receiving and sending an access signal. In the access signal sending method provided by the invention, the sending equipment sends one or more access signals, and the access signals are repeatedly sent in the time domain, so that the network coverage can be enhanced. In the access signal receiving method provided by the invention, the receiving equipment carries out time domain combination on the access signals and carries out access signal detection according to the access signals after the time domain combination, thereby improving the probability of detecting the access signals.

Description

Access signal receiving and sending method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for receiving and sending an access signal.

Background

The wireless communication system at least includes a network station (node) and User Equipment (User Equipment, UE for short) for downlink transmission and uplink reception, where the number of stations may be one or more. After the UE is started, a network station is searched and network access is carried out through the network station. If a plurality of network stations are included in one wireless network, the UE can be accessed through any one of the plurality of network stations.

For example, in a Long Term Evolution (LTE) system, each network station may be configured as a cell (cell), each cell sends a Synchronization (SYNC) signal, and the UE detects the SYNC signals of different cells and selects a cell for network access, and may further perform synchronization.

In the network access process, the probability of detecting the synchronization signal needs to be further improved.

Disclosure of Invention

The embodiment of the invention provides an access signal receiving method and device, which are used for improving the probability of detecting an access signal.

The access signal receiving method provided by the embodiment of the invention comprises the following steps:

the receiving equipment carries out time domain combination on the access signals;

and the receiving equipment detects the access signal according to the access signal after time domain combination.

Optionally, before the receiving device performs time domain combining on the access signal, the method further includes: the receiving equipment receives an access signal on a target frequency and samples the access signal; the target frequency is the frequency of the access signal or the search frequency set by the receiving device.

Optionally, the time domain combining, performed by the receiving device, the access signal includes: the receiving equipment carries out time domain combination on the current time and K access signals before the current time by a first time length at each set time; the first duration is an access signal combination time interval of the receiving device, and K is a non-zero integer.

Optionally, the first duration is determined by the receiving device based on an access signal repeat transmission time interval or a candidate set of access signal repeat transmission time intervals; wherein the access signal repeat transmission time interval or the candidate set of access signal repeat transmission time intervals is pre-agreed or pre-informed to the receiving device by the transmitting device.

Optionally, the first time length is equal to an access signal repeated transmission time interval; or the first duration and the access signal repeated transmission time interval have integral multiple relation; or the first time length and the maximum value or the minimum value in the candidate set of the access signal repeated transmission time interval have integral multiple relation.

Optionally, the value of K is determined by the receiving device based on a number of times of repeated transmission in an access signal transmission period or a candidate set of the number of times of repeated transmission in the access signal transmission period; the number of times of repeated transmission in the access signal transmission period or the candidate set of the number of times of repeated transmission in the access signal transmission period is predetermined or notified to the receiving device by the transmitting device in advance.

Optionally, K is equal to the number of times that the access signal is repeatedly transmitted within a repetition period; or,

k and the number of times of repeated sending of the access signal in the repetition period have an integral multiple relation; or

K has an integer multiple relationship with the maximum or minimum value of the candidate set of access signal repeat transmission time intervals.

Optionally, before the time-domain combining the access signals, the method further includes: filtering the received signal according to the bandwidth and frequency of the access signal; time domain combining access signals, comprising: and carrying out time domain combination on the filtered access signals.

Optionally, one or any combination of the following steps is also included:

the receiving equipment identifies the sending equipment according to the access signal after time domain combination;

the receiving equipment detects a system information area according to the access signal after time domain combination;

and the receiving equipment acquires synchronous information according to the access signal after time domain combination and carries out synchronization according to the acquired synchronous information.

Optionally, the identifying, by the receiving device, the sending device according to the access signal after the time domain combining includes: the receiving equipment uses the local sequence to correlate with the access signal after time domain combination, and obtains all or part of identification information of the sending equipment through peak detection; the local sequence is a sequence generated by the receiving device by using possible identification information of the sending device, and the possible identification information of the sending device is all pieces of identification information of the sending device agreed in advance.

Optionally, the obtaining, by the receiving device, synchronization information according to the access signal after time domain combining includes:

the receiving device uses the local sequence to correlate with the access signal after time domain combination, and obtains the timing synchronization information of the access signal corresponding to the current time through peak detection.

Optionally, the obtaining, by the receiving device, synchronization information according to the access signal after time domain combining includes: the receiving equipment detects a timing reference signal corresponding to the current moment and obtains the frequency domain position or identification information of the timing reference signal;

and the receiving equipment determines the timing synchronization of the access signals according to the corresponding relation between the timing reference signals and the access signals or the corresponding relation between the identification information of the timing reference signals and the timing information.

Optionally, the correspondence between the timing reference signal and the access signal is agreed in advance or notified to the receiving device by the sending device; or, the correspondence between the identification information of the timing reference signal and the timing information is agreed in advance or notified to the receiving device by the sending device.

Optionally, the correspondence between the timing reference signal and the access signal includes: the relative relation between the frequency domain position of the access signal and the frequency domain position of the timing reference signal sent at the same time; or, the detected relative relationship between all or part of the identification information of the transmitting device and the identification information of the sequence of the timing reference signal; wherein the identification information of the transmitting device is obtained by: the receiving device uses the local sequence to correlate with the access signal after time domain combination, and obtains the identification information of the sending device corresponding to the access signal through peak detection.

Optionally, the access signal is repeatedly transmitted in the time domain.

Optionally, the access signal is repeatedly transmitted in a time domain, including: the access signal is repeatedly transmitted on adjacent or non-adjacent symbols, wherein the adjacent or non-adjacent symbols are in the same subframe or different subframes; and/or the access signal is repeatedly transmitted in adjacent or non-adjacent subframes.

Alternatively, the access signals retransmitted in the time domain are located in the same position in the frequency domain.

The receiving device provided by the embodiment of the invention comprises:

the merging module is used for merging the time domain of the access signals;

and the detection module is used for detecting the access signal according to the access signal after time domain combination.

The device for communication provided by the embodiment of the invention comprises: a transceiver, a processor, and a memory;

the memory to store computer program instructions;

the processor, coupled to the memory, to read the computer program instructions stored by the memory and execute the method of any of claims 1 to 16.

In the above embodiments of the present invention, the receiving device performs time domain combination on the access signal, and performs access signal detection according to the access signal after time domain combination, thereby improving the probability of detecting the access signal.

The embodiment of the invention also provides an access signal sending method and device, which are used for enhancing network coverage.

The method for sending the access signal provided by the embodiment of the invention comprises the following steps:

a transmitting device transmits one or more access signals, wherein the access signals are repeatedly transmitted in the time domain.

Optionally, the repeatedly transmitting the access signal in the time domain includes: the access signal is repeatedly transmitted on adjacent or non-adjacent symbols, wherein the adjacent or non-adjacent symbols are in the same subframe or different subframes; and/or the access signal is repeatedly transmitted in adjacent or non-adjacent subframes.

Optionally, the repeated transmission mode of the access signal in the time domain is determined by system convention or by the transmitting device.

Optionally, the method further comprises: and the sending equipment sends a timing reference signal on the symbol where the access signal is located.

Optionally, there is a correspondence between the timing reference signal and the access signal, or a correspondence between the identification information of the timing reference signal and the timing information.

Optionally, there is a pre-agreed correspondence between the timing reference signal and the access signal, or the sending device notifies the receiving device of the correspondence; or, there is a pre-agreed correspondence between the identification information of the timing reference signal and the timing information, or the sending device notifies the receiving device of the correspondence.

The transmitting device provided by the embodiment of the invention comprises:

a sending module, configured to send one or more access signals, where the access signals are repeatedly sent in a time domain.

the memory to store computer program instructions;

the processor, coupled to the memory, to read the computer program instructions stored by the memory and perform the method of any of claims 17 to 21.

In the above embodiments of the present invention, the transmitting device transmits one or more access signals, and the access signals are repeatedly transmitted in the time domain, so that the network coverage can be enhanced.

Drawings

Fig. 1 is a schematic diagram of a wireless network architecture according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating the repeated transmission of AS over adjacent OFDM symbols in accordance with an embodiment of the present invention;

FIG. 3 is a diagram illustrating the repeated transmission of AS in non-adjacent subframes according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an AS receiving flow provided in the embodiment of the present invention;

fig. 5 and fig. 6 are schematic diagrams of the AS reception performed by the delay delayer according to the embodiment of the present invention;

fig. 7 is a schematic structural diagram of a receiving device according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an apparatus for communication according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a sending device according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of an apparatus for communication according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the embodiment of the present invention, the related devices include a sending device and a receiving device, and downlink transmission and uplink reception may be performed between the sending device and the receiving device accessing the sending device. The sending device may send one or more access signals, and the receiving device may receive the access signals sent by the sending device and may perform network access according to the received access signals.

The sending device may be a base station or other types of transmission point devices, and the receiving device may be a user equipment (or terminal). Of course, the present invention is not limited to the above two devices, and for example, the sending device may also be a terminal capable of performing configuration operations on other terminals. A transmitting device may also be considered to comprise a plurality of network stations. The network station may include only radio frequency (e.g., RRU) or both baseband and radio frequency (e.g., Active antenna). The network station may include only a baseband (e.g., BBU); or it may not include any digital/radio frequency function of the air interface layer, only takes charge of high-level signal processing, and puts the baseband processing of the air interface layer to active antenna. Other various network implementation possibilities also exist.

The base station may be an LTE system or an evolved Node B (eNB or e-NodeB) in the LTE system, a macro base station, a micro base station (also referred to as a "small base station"), a pico base station, an Access Point (AP) or a transmission point (TRP), or the like, or may be a base station in a future network, such as a base station in a 5G network.

A Terminal may also be referred to as a User Equipment (UE), or may be referred to as Terminal, a Mobile Station (MS), a Mobile Terminal (RAN), and the like, and the Terminal may communicate with one or more core networks via a Radio Access Network (RAN), for example, the Terminal may be a Mobile phone (or may be referred to as a "cellular" phone), a computer with a Mobile Terminal, and the like, and for example, the Terminal may also be a portable, pocket, handheld, computer-embedded, or vehicle-mounted Mobile device, and they exchange voice and/or data with the RAN. The terminal in the embodiment of the present invention may also be a D2D (Device to Device) terminal or an M2M (Machine to Machine) terminal.

For convenience of description, the following embodiments take TRP as a transmitting device and user equipment as a receiving device as an example for explanation.

The wireless network may cover a plurality of cells (cells), different cells cover different ranges, and one cell may be used for the user equipment to access the network. Each cell corresponds to a unique cell ID. One or several TRPs may be included in one cell. Each TRP includes N antennas, N being an integer greater than or equal to 1. The antennas on the TRP may perform beamforming, and the downlink signals are transmitted on the antennas after beamforming. Each beam provides either wide or narrow coverage, depending on the number of antennas and the beamforming approach.

In the embodiment of the present invention, a cell in a wireless network may be replaced with a System information area (System information area). A cell or system information area is defined as a wireless network object. In the following embodiments, unless otherwise specified, a "cell" is used for description, but it should be understood that a "cell" in the embodiments of the present invention may be replaced with a "wireless network object" defined above, such as a "system information area".

Fig. 1 schematically shows a network architecture to which an embodiment of the present invention is applicable. Wherein, cell 1 includes a TRP, the TRP sends a wide coverage beam to cover the range of the cell; one TRP is included in cell 2, which transmits two narrow coverage beams (beam 1 and beam 2 shown in cell 2 in the figure) to cover the range of the cell; two TRPs are included in the cell 3, each TRP transmits one narrow coverage beam, and the two narrow coverage beams (beam 1 and beam 2 shown in the cell 3 in the figure) transmitted by the two TRPs can cover the range of the cell.

The TRP in the wireless network sends an access signal, and the user equipment can perform network access based on the received access signal. In the embodiment of the present invention, an access signal for a user equipment to access a network is referred to as an as (access signal).

It should be noted that. The AS in the embodiment of the present invention is used to broadly refer to one or several signals that may be used by the user equipment during the process of accessing the network, and is a generic term for signals required by the user equipment during the process of accessing the network. The AS may comprise one signal or may comprise a plurality of signals. An AS may be used to implement one or more functions that may include, but are not limited to: initial synchronization (e.g., cell synchronization, time/frequency domain synchronization), cell (or system information region) ID detection, system information demodulation, and so on. Accordingly, signals contained within an AS may perform one or more of the functions enumerated above. In the embodiment of the present invention, the functions provided by the AS may include one or some of the above-listed functions, but are not limited to the above-listed functions, and signals included in one AS are also not limited to specific signals for implementing one or some of the above-listed functions.

Existing communication systems are primarily focused on low frequency band deployments. With the development of communication technology, future communication systems will be deployed in a large bandwidth range of 0.4 GHz-100 GHz. Due to the difference in the transmission performance between the low frequency band below 6GHz and the high frequency band above 6GHz, the path loss of the high frequency band is much higher than that of the low frequency band, for example, the transmission distance is the same, and the path loss of the 26GHz carrier frequency is 20dB higher than that of the 2.6GHz carrier frequency under the line-of-sight condition. Under the condition that Effective Isotropic Radiated Power (EIRP) is the same, the coverage of the high-band signal is sharply reduced.

In order to enhance network coverage, in the embodiment of the present invention, the sending device sends one or more ASs, and the ASs may repeatedly send in the time domain.

One AS can enable one or more user equipment to access a cell or perform cell identification. A user equipment may also access or perform cell identification based on one or more ASs.

One AS can be transmitted by one TRP or a group of TRPs. From the perspective of one TRP in one cell, the TRP may transmit one AS, and the transmitted AS is different from the AS transmitted by other TRPs in the cell; or, the TRP may transmit one AS, and the transmitted AS is the same AS the AS transmitted by at least one other TRP in the cell; alternatively, the TRP may send multiple ASs.

Alternatively, the number of ASs transmitted by a cell may be related to a number of factors. For example, the number of ASs transmitted by a TRP is related to the number of beams used by the TRP, for example, the number of AS transmitted by a TRP is equal to the number of beams used by the TRP. AS another example, the number of ASs transmitted by all TRPs in a cell is related to the number of TRPs in the cell, for example, the number of ASs transmitted by a cell is the same AS the number of TRPs included in the cell. AS another example, the number of ASs transmitted by all TRPs in a cell is related to the number of TRPs in the cell and the number of beams used by each TRP.

AS an example, if a cell includes N (N is an integer greater than 1) TRPs and each TRP transmits one AS, the cell may transmit N ASs. Each TRP adopts a wide beam forming mode to transmit AS, and the beam used by the TRP can cover the coverage range of the TRP. Thus, the N ASs of the cell can cover the coverage of all TRPs of the entire cell.

AS another example, a cell contains a TRP, which transmits M ASs using M (M is an integer greater than 1) beams, each AS transmitting using one beam, each beam pointing in one direction, and the M beams may cover the coverage area of the entire cell.

If one TRP in one cell or cell transmits multiple ASs, different ASs transmit on different resources, i.e., the multiple ASs may be multiplexed in one or more multiplexing manners. The multiple ASs are multiplexed in different ways, so that the user equipment can distinguish different ASs.

The multiplexing modes adopted by different ASs may include one or more combinations of the following multiplexing modes:

time Division Multiplexing (TDM): different ases or at least one component of different ases, transmitting at different time resources;

frequency Division Multiplexing (FDM): different ases or at least one component of different ases, transmitting at different frequency resources;

space Division Multiplexing (SDM): different ases or at least one component of different ases, transmitting using different beams or through different TRPs in different spatial resources;

code Division Multiplexing (CDM): different ases, or at least a component of different ases, are transmitted using different sequences, where the sequences may include one or more combinations of transmission sequences (e.g., base sequence), scrambling sequence (scrambling sequence), and spreading sequence, among others.

AS previously described, the AS may repeatedly transmit in the time domain. The AS may repeat transmission in the time domain in various manners, for example, the AS may repeat transmission on adjacent or non-adjacent symbols, where the adjacent or non-adjacent symbols may be in the same subframe or in different subframes. The AS may also repeat transmissions in adjacent or non-adjacent subframes. Of course, a combination of the two approaches can be used.

The repeated transmission mode of the AS in the time domain may be agreed by the system, or determined by the transmitting device, and the repeated transmission mode of the AS in the time domain may be kept unchanged or may be changed AS needed.

Fig. 2 shows an example of repeatedly transmitting an AS over N adjacent Orthogonal Frequency Division Multiplexing (OFDM) symbols (N is an integer greater than 1). AS shown in fig. 2, the AS is repeatedly transmitted over N adjacent OFDM symbols in the figure, which are diagonally filled.

In particular implementation, the AS may transmit on N adjacent symbols in the following subframe: subframe n, subframe n + x, subframe n +2x, … …, and so on. Wherein, "n, n + x, n +2x, … …" represents a subframe number, x is an integer greater than 1, and the maximum value of x is the number of OFDM symbols included in one subframe. For example, AS is transmitted on OFDM symbols 0 to 3 in odd numbered subframes, in this example, if one 10ms radio frame is taken AS the transmission period of the AS, the number of times the AS is repeated in each transmission period is 20(AS is transmitted in 5 subframes and transmitted on 4 symbols in each subframe); if 2 subframe lengths are taken AS the transmission periods of the AS, the number of times of repetition of the AS in each transmission period is 4 (transmission over 4 symbols in the first subframe of 2 subframes). In the above example, the AS repeats transmission on consecutive 4 symbols, and therefore the repeat transmission time interval is 1 symbol in time length. In another example, the N consecutive OFDM symbols may be located in a plurality of subframes, and for example, when N is 4, the adjacent 4 OFDM symbols are: the last 2 OFDM symbols of subframe 0 and the first 2 OFDM symbols of subframe 1.

In other embodiments, the example of AS may be repeatedly transmitted on the kth OFDM symbol in N1 ms subframes of a 10ms radio frame (N is an integer greater than 1), and the N subframes may or may not be adjacent. Fig. 3 shows the case when N is 2 and k is 1, that is, the AS is repeatedly transmitted every other subframe. AS shown in fig. 3, the AS is repeatedly transmitted on the 1 st OFDM symbol within the N subframes shown in the drawing (the slashed portion indicates a symbol of the AS is transmitted in the drawing). In another example, the subframe for transmitting the AS may be N adjacent subframes in one radio frame.

Optionally, the locations of the AS repeated in the time domain in the frequency domain are the same.

Optionally, the repeated transmission manner of the AS (for example, one or more of parameters such AS an AS repeated transmission time interval, an AS transmission cycle, and the number of times of repeated transmission of the AS in one transmission cycle) may be predetermined or may be configured to the user equipment in advance. For example, the number of times of the repeated transmission of the AS in one transmission period may be predetermined or may be configured to the user equipment in advance. Alternatively, the transmission period of the AS may be configured by the transmitting device. Alternatively, the number of repeated transmissions of the AS within one repetition period may be configured by the transmitting device.

As can be seen from the above description, in the above embodiments of the present invention, the transmitting device transmits one or more access signals, which are repeatedly transmitted in the time domain, so that the network coverage can be enhanced.

Referring to fig. 4, a schematic diagram of a process for receiving an access signal according to an embodiment of the present invention is provided, where the process may be executed on a receiving device side (e.g., a user equipment side). As shown, the process may include the following steps:

step 401: the receiving device accesses the signal.

In this step, the receiving device may receive and sample the access signal at the target frequency. Wherein, the target frequency may be a frequency where the AS is located. If the receiving device can not obtain the frequency of the AS, the signal search can be carried out according to the search frequency set by the receiving device. For example, if the AS transmits at the center frequency point of the system bandwidth, the UE does not know the center frequency at the time of initial access, and thus can only search for the center frequency in a grid of 100KHz or a fixed size.

The sampling rate employed by the receiving device may be determined based on the system bandwidth or may employ a fixed sampling rate. For example, the UE does not know the system bandwidth at the time of initial access, and can only perform sampling according to the set bandwidth, for example, the sampling rate is determined according to the largest or smallest system bandwidth among the possible system bandwidths.

Step 402: the receiving device filters the received signal according to the bandwidth and frequency of the access signal.

In this step, the receiving device may use a band pass filter to filter the access signal, so AS to preserve the frequency of the AS and filter out other unnecessary signals. In step 401, the receiving device samples the access signal to obtain a time domain signal, but the AS usually only occupies a part of the bandwidth, so that the band-pass filter is used for filtering, and the signal in the frequency band where the AS is located can be retained to eliminate the influence of other frequency signals. The band of this bandpass filter may be near the center frequency point or may have a certain deviation from the center frequency point, depending on the AS frequency location. For example, the bandpass filter only retains signals near 180kHz from the center frequency point.

Optionally, the width of the band pass filter is not less than the bandwidth of one AS.

Step 403: and the receiving equipment carries out time domain combination on the filtered access signals.

In this step, the receiving device may perform time domain combination on K access signals at the current time and before the current time by using the first duration at each set time. The first duration is an access signal combination time interval of the receiving device, and K is a nonzero integer. Accordingly, in step 404, the receiving device performs access signal detection on the combined access signals at each set time.

The value of the first duration and/or the value of K may be set by the receiving device, may be configured to the receiving device by the sending device, or may be agreed by the system.

Alternatively, the first duration may be determined by the receiving device based on the access signal repetition transmission time interval or a candidate set of access signal repetition transmission time intervals. The access signal repeat transmission time interval or the candidate set of the access signal repeat transmission time interval may be agreed in advance, or may be notified to the receiving device by the transmitting device in advance.

Optionally, the first duration may have one of the following characteristics:

the first time length is equal to the access signal repeated transmission time interval; for example, taking AS an example the AS repeat transmission manner shown in fig. 2, in the case of transmitting an AS on the first 4 symbols in the odd-numbered subframes, the first time length is equal to the time length of 1 symbol;

the first time length and the access signal repeated transmission time interval have the relation of integral multiple, namely, the first time length is equal to the integral multiple of the access signal repeated transmission time interval, or the repeated transmission time interval is equal to the integral multiple of the first time length;

the first duration has an integer multiple of a maximum or minimum value in a candidate set of repeated transmission time intervals of the access signal.

Optionally, the value of the number K of access signals may be determined by the receiving device based on the number of times of repeated transmission in the access signal transmission period or a candidate set of the number of times of repeated transmission in the access signal transmission period. The candidate set of the number of times of repeated transmission in the access signal transmission period or the number of times of repeated transmission in the access signal transmission period is predetermined or notified to the receiving device by the transmitting device in advance.

Optionally, the value of K may have one of the following characteristics:

k is equal to the number of times of repeated transmission of the access signal in a repetition period; for example, taking the AS repeat transmission scheme shown in fig. 2 AS an example, when an AS is transmitted on the first 4 symbols in the odd-numbered subframes, K is 4;

k has an integer multiple relationship with the number of times the access signal is repeatedly transmitted within the repetition period, i.e., K is equal to an integer multiple of the number of times the access signal is repeatedly transmitted within the repetition period, or the number of times the access signal is repeatedly transmitted within the repetition period is equal to an integer multiple of N;

k has an integer multiple relationship with the maximum or minimum value of the candidate set of access signal repeat transmission time intervals, wherein the possible number of times the access signal is repeatedly transmitted within the repetition period is specified by a protocol or the transmitting device notifies the receiving device.

In particular, one or more delays may be used to select and combine signals received at different times. The delay time of the delayer can be equal to the repeated transmission time interval of the AS, or equal to one M times of the repeated transmission time interval of the AS, wherein M is an integer greater than 1, namely the repeated transmission time interval of the AS is M times of the delay time length of the delayer, so AS to ensure that the delayer can select the signal for transmitting the AS. The number of the delayers may be equal to the repetition number of the AS minus 1, or may be smaller than the repetition number of the AS minus 1, where the number of the combined signals is less than M, or may be larger than the repetition number of the AS minus 1, where other signals may be mixed in the combined signals.

Taking the AS repeat transmission scheme shown in fig. 2 AS an example, in the case of transmitting an AS on the first 4 symbols in the odd-numbered sub-frame, AS shown in fig. 5, 3 delayers may be provided, each with a delay time length of 1 symbol.

Taking the AS repeat transmission mode shown in fig. 3 AS an example, AS shown in fig. 6, 1 delayer may be provided, and the delay time length of each delayer is 2 sub-frames.

Step 404: and the receiving equipment detects the access signal according to the access signal after time domain combination.

In this step, the receiving device may correlate the access signal after time domain combination with the local sequence to obtain a peak value of the access signal after time domain combination, and determine whether an AS exists according to the peak value. AS an example, the UE may correlate the access signal after combining the local sequence with the time domain, find a peak value through peak detection, and consider the AS to exist if the peak value is greater than a certain threshold.

For example, the time-domain signal after the band-pass filtering is represented as r (0), r (1),.. times, r (n),. times, and.. times, each OFDM symbol has L sampling points, then the signal after the time-domain combining is represented as:

the UE finds a peak value in y (t) by correlating the local sequence with y (t), and the position of the peak value is set as t₀Then, the UE may compare the correlation values of the following 2K-1 positions, and select the position with the largest correlation value as the determined peak position:

t₀-L(K-1),t₀-L(K-2),...,t₀-L,t₀,t₀+L,...,t₀+L(K-2),t₀+L(K-1)

alternatively, the receiving device may detect multiple ASs from the time-domain combined access signal by using the local sequence.

Optionally, the receiving device may also obtain synchronization information using the peak value while detecting the AS. Ideally, the peak corresponds to the time of the last AS transmitted (since the combined signal at that time corresponds to all AS transmitted), and the timing information of the symbol of the last AS transmitted can be obtained from the peak. However, in practical cases, the ue may not receive all the repeatedly transmitted ASs, or due to the influence of noise, the peak detected by the ue does not correspond to the timing information of the symbol of the last transmitted AS. The timing information of the symbols may be assisted at this time based on other signals.

In the embodiment of the present invention, one possible method is: and sending another signal on a symbol corresponding to the AS, wherein the signal has a timing reference function, and the receiving equipment can combine AS detection and the signal to realize synchronization. Here, it is referred to as a timing reference signal. Of course, the signal may be named by other names, and further, the signal may have other functions, and the embodiments of the present application are not limited thereto.

Correspondingly, in the process of acquiring the synchronization information according to the access signal after time domain combination, the receiving device can detect the timing reference signal corresponding to the current moment, and determine the timing synchronization of the AS according to the corresponding relation between the timing reference signal and the AS or the corresponding relation between the identification information of the timing reference signal and the timing information. The identification information of the timing reference signal may include a sequence of the timing reference signal or an ID of the timing reference signal or a frequency domain location where the timing reference signal is located.

Optionally, the correspondence between the identification information of the timing reference signal and the timing information may include: the correspondence between the identification information of the timing reference signal and the time domain position where the timing reference signal is located may be, more specifically, the correspondence between the identification information of the timing reference signal and the symbol where the timing reference signal is located.

For example, timing reference signals on different symbols transmitting the same AS correspond to different sequences, so that there is a correspondence between the sequence of the timing reference signals and the symbol in which the timing reference signal is located. The transmitting device may obtain a timing reference sequence corresponding to the symbol where the AS is located based on the correspondence, thereby generating and transmitting a timing reference signal. On the receiving device side, the receiving device may generate a local sequence and perform blind detection based on the local sequence (i.e., perform correlation with the access signal using the local sequence), and if a timing reference signal is detected (e.g., a correlation peak is greater than a given threshold), determine a symbol corresponding to the sequence of the timing reference signal (i.e., determine a position of the symbol in a subframe) based on the correspondence, thereby obtaining timing information.

AS another example, timing reference signals on different symbols transmitting the same AS correspond to different IDs. The ID of the timing reference signal on different symbols is different. On the transmitting device side, the transmitting device may generate a sequence of timing reference signals using the IDs of the timing reference signals, such that the timing reference signals of different IDs have different sequences from each other to ensure that the sequences of timing reference signals on different symbols are distinct. On the receiving device side, the receiving device may generate a local sequence and perform blind detection based on the local sequence (i.e., perform correlation with the access signal using the local sequence), and if a timing reference signal is detected (e.g., a correlation peak is greater than a given threshold), determine a symbol corresponding to an ID of the timing reference signal based on the correspondence (i.e., determine a position of the symbol in a subframe), thereby obtaining timing information.

The correspondence between the identification information of the timing reference signal and the timing information may be: the correspondence between the frequency domain position of the timing reference signal and the time domain position of the timing reference signal, more specifically, may be the correspondence between the frequency domain position of the timing reference signal and the symbol of the timing reference signal. For example, the repeatedly transmitted AS has the same frequency domain position on the symbol, but the timing reference signal has a different frequency domain position on different symbols. For example, the AS is transmitted on symbol 0 and symbol 1, the AS is located in the same frequency domain AS on symbol 0 and symbol 1, the synchronization reference signal transmitted on symbol 0 is separated from the AS by 6 Physical Resource Blocks (PRBs) in the frequency domain, and the synchronization reference signal transmitted on symbol 1 is separated from the AS by 12 PRBs in the frequency domain. In this way, on the transmitting device side, the transmitting device can transmit the AS and the timing reference sequence at the respective frequency domain positions of the symbol where the AS is located, based on the correspondence. On the receiving device side, the receiving device may generate a local sequence and perform blind detection based on the sequence, and if a timing reference signal is detected, a symbol corresponding to the frequency domain position (that is, a position of the symbol in a subframe is determined) may be determined based on the correspondence and the frequency domain position of the timing reference signal, so as to obtain timing information.

Optionally, the correspondence between the timing reference signal and the AS may include: the frequency domain position of the timing reference signal corresponds to the frequency domain position of the AS (i.e. the frequency domain position of the timing reference signal can be determined according to the frequency domain position of the AS).

Optionally, the step 402 is an optional step. If step 402 is omitted, the receiving device performs time domain combining on the access signals that are not filtered in step 403.

The timing reference signals of different cells may be the same or different. By reasonable design, the timing reference signal can be detected without retransmission. For example, the timing reference signal is designed with a different sequence than the synchronization signal, e.g., the timing reference signal uses a longer sequence.

Optionally, the receiving device may also perform some other processing according to the combined access signal. For example, the receiving device may perform one or more combinations of the following steps based on the combined access signal:

identifying a sending device;

detecting a system information area;

obtaining synchronization information;

and carrying out time-frequency synchronization.

Optionally, the process of the receiving device identifying the sending device according to the access signal after time domain combination may include: and performing correlation by using the local sequence and the access signal after time domain combination, and acquiring all or part of identification information of the sending equipment through peak detection. The local sequence is a sequence generated by the receiving device by using the possible identification information of the sending device, and the possible identification information of the sending device is all the identification information of the sending device agreed in advance.

Optionally, the process of the receiving device obtaining the synchronization information according to the access signal after time domain combination may include: and performing correlation by using the local sequence and the access signal after time domain combination, and obtaining timing synchronization information of the access signal corresponding to the current time through peak value detection.

More specifically, the receiving device detects a timing reference signal corresponding to the current time, and obtains a frequency domain position or identification information of the timing reference signal; and determining the timing synchronization of the access signals according to the corresponding relation between the timing reference signals and the access signals or the corresponding relation between the identification information of the timing reference signals and the timing information. The corresponding relationship between the timing reference signal and the access signal may include a relative relationship between a frequency domain position of the access signal and a frequency domain position of the timing reference signal sent at the same time; alternatively, the correspondence between the timing reference signal and the access signal may include: the detected relative relationship between all or part of the identification information of the transmitting device and the identification information of the sequence of the timing reference signal. The method for determining the identification information of the sending device may be as described above. The above-mentioned corresponding relation can be agreed in advance, and can also be notified to the receiving device by the transmitting device.

The above lists only a few operations, and the embodiment of the present invention does not limit the processing operations that can be performed based on the combined access signal.

It should be noted that, in the flow shown in fig. 4, the definition and the sending method of the access signal can be referred to the current protocol specification. The definition and the sending method of the access signal in the flow shown in fig. 4 also refer to the description of the foregoing embodiment of the present invention, and the content included in the access signal and the sending manner are not limited in the embodiment of the present invention.

Based on the same technical concept, the embodiment of the present invention further provides a receiving device, which can implement the AS receiving procedure described in the foregoing embodiment.

As shown in fig. 7, the receiving apparatus may include: the merging module 702 and the detecting module 703 may further include one or more of the following modules: a receiving module 701, a filtering module 704, and a processing module 705, wherein:

a merging module 702, configured to perform time domain merging on the access signals;

the detecting module 703 is configured to perform access signal detection according to the access signal after time domain combination.

Optionally, the receiving module 701 may receive and sample an access signal at a target frequency; the target frequency is the frequency of the access signal or the search frequency set by the receiving device.

Optionally, the merging module 702 may be specifically configured to: carrying out time domain combination on K access signals at the current time and before the current time by a first time length at each set time; the first duration is an access signal combination time interval of the receiving device, and K is a non-zero integer.

Optionally, the filtering module 704 may filter the received signal according to the bandwidth and frequency of the access signal before performing time domain combination on the access signal; correspondingly, the merging module 702 is specifically configured to: and carrying out time domain combination on the filtered access signals.

Optionally, the processing module 705 may perform one or any combination of the following steps:

identifying the sending equipment according to the access signal after time domain combination;

detecting a system information area according to the access signal after time domain combination;

and according to the access signal after the time domain combination, obtaining synchronous information, and synchronizing according to the obtained synchronous information.

Optionally, the access signal is repeatedly transmitted in the time domain.

Based on the same technical concept, the embodiment of the present invention further provides a device for communication, which can implement the AS receiving procedure described in the foregoing embodiment.

As shown in fig. 8, the apparatus may include: a processor 801, a memory 802, a transceiver 803, and a bus interface. The processor 801 is responsible for managing the bus architecture and general processing, and the memory 802 may store data used by the processor 801 in performing operations. The transceiver 803 is used for receiving and transmitting data under the control of the processor 801.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 801, and various circuits, represented by the memory 802, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 801 is responsible for managing the bus architecture and general processing, and the memory 802 may store data used by the processor 801 in performing operations.

The processes disclosed in the embodiments of the present invention can be applied to the processor 801 or implemented by the processor 801. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 801. The processor 801 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 802, and the processor 801 reads the information in the memory 802, and completes the steps of the signal processing flow in combination with the hardware thereof.

Specifically, the processor 801, which is configured to read the program in the memory 802, executes the following processes: and carrying out time domain combination on the access signals, and carrying out access signal detection according to the access signals after the time domain combination.

The specific implementation process of the access signal receiving procedure can be referred to the foregoing embodiments, and is not described in detail here.

Based on the same technical concept, the embodiment of the present invention further provides a sending device, which can implement the AS sending process described in the foregoing embodiment.

As shown in fig. 9, the transmitting apparatus may include: a sending module 901, wherein:

a sending module 901, configured to send one or more access signals, where the access signals are repeatedly sent in a time domain.

Optionally, the access signal is repeatedly transmitted on adjacent or non-adjacent symbols, wherein the adjacent or non-adjacent symbols are within the same subframe or different subframes; and/or the access signal is repeatedly transmitted in adjacent or non-adjacent subframes.

Optionally, the sending module 901 is further configured to: the timing reference signal is transmitted on the symbol on which the access signal is located. For the sending method of the timing reference signal, reference may be made to the foregoing embodiments, and details are not described here.

Based on the same technical concept, the embodiment of the present invention further provides a device for communication, which can implement the AS sending procedure described in the foregoing embodiment.

As shown in fig. 10, the apparatus may include: a processor 1001, a memory 1002, a transceiver 1003, and a bus interface. The processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1002 may store data used by the processor 1001 in performing operations. The transceiver 1003 is used for receiving and transmitting data under the control of the processor 1001.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 1001, and various circuits, represented by the memory 1002, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1002 may store data used by the processor 1001 in performing operations.

The process disclosed in the embodiment of the present invention may be applied to the processor 1001, or implemented by the processor 1001. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 1001. The processor 1001 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1002, and the processor 1001 reads the information in the memory 1002 and completes the steps of the signal processing flow in combination with the hardware thereof.

Specifically, the processor 1001, configured to read a program in the memory 1002, executes the following processes: transmitting one or more access signals, wherein the access signals are repeatedly transmitted in a time domain.

The specific implementation process of the access signaling procedure can be referred to the foregoing embodiments, and is not described in detail here.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An access signal receiving method is applied to a process that a receiving device detects an access signal sent by a sending device, wherein the sending device comprises a base station, the receiving device comprises a terminal, and the method comprises the following steps:

the receiving equipment detects the access signal according to the access signal after time domain combination;

wherein the access signal is further repeatedly transmitted in a transmission period of the repeated transmission, so that the access signal is repeatedly transmitted in adjacent or non-adjacent subframes and/or adjacent or non-adjacent symbols, and the adjacent or non-adjacent symbols are in the same subframe or different subframes.

2. The method of claim 1, wherein prior to the receiving device time-domain combining the access signals, further comprising:

the receiving equipment receives an access signal on a target frequency and samples the access signal; the target frequency is the frequency of the access signal or the search frequency set by the receiving device.

3. The method of claim 1, wherein the receiving device time domain combining the access signals comprises:

the receiving equipment carries out time domain combination on the current time and K access signals before the current time by a first time length at each set time; the first duration is an access signal combination time interval of the receiving device, and K is a non-zero integer.

4. The method of claim 3, wherein the first duration is determined by the receiving device based on an access signal repeat transmission time interval or a candidate set of access signal repeat transmission time intervals; wherein the access signal repeat transmission time interval or the candidate set of access signal repeat transmission time intervals is pre-agreed or pre-informed to the receiving device by the transmitting device.

5. The method of claim 4, wherein the first time length is equal to an access signal repetition transmission time interval; or,

the first duration and the access signal repeated transmission time interval have integral multiple relation; or

The first duration has an integer multiple relationship with a maximum value or a minimum value in a candidate set of access signal repeated transmission time intervals.

6. The method of claim 3, wherein a value of K is determined by the receiving device based on a candidate set of times of repeated transmission within an access signal transmission period or times of repeated transmission within an access signal transmission period; the number of times of repeated transmission in the access signal transmission period or the candidate set of the number of times of repeated transmission in the access signal transmission period is predetermined or notified to the receiving device by the transmitting device in advance.

7. The method of claim 6, wherein K is equal to a number of times the access signal is repeatedly transmitted within a repetition period; or,

8. The method of claim 1, wherein prior to time domain combining the access signals, further comprising:

filtering the received signal according to the bandwidth and frequency of the access signal;

time domain combining access signals, comprising:

and carrying out time domain combination on the filtered access signals.

9. The method of claim 1, further comprising one or any combination of the following steps:

10. The method of claim 9, wherein the receiving device identifying the transmitting device according to the time-domain combined access signal comprises:

the receiving equipment uses the local sequence to correlate with the access signal after time domain combination, and obtains all or part of identification information of the sending equipment through peak detection; the local sequence is a sequence generated by the receiving device by using possible identification information of the sending device, and the possible identification information of the sending device is all pieces of identification information of the sending device agreed in advance.

11. The method of claim 9, wherein the receiving device obtains the synchronization information according to the time domain combined access signal, comprising:

12. The method of claim 9, wherein the receiving device obtains the synchronization information according to the time domain combined access signal, comprising:

the receiving equipment detects a timing reference signal corresponding to the current moment and obtains the frequency domain position or identification information of the timing reference signal;

13. The method of claim 12, wherein the correspondence between the timing reference signal and the access signal is agreed in advance or notified to the receiving device by a transmitting device; or,

the corresponding relation between the identification information of the timing reference signal and the timing information is agreed in advance or is notified to the receiving device by the sending device.

14. The method of claim 12, wherein the correspondence between the timing reference signal and the access signal comprises:

the relative relation between the frequency domain position of the access signal and the frequency domain position of the timing reference signal sent at the same time; or,

the detected relative relationship between all or part of the identification information of the transmitting device and the identification information of the sequence of the timing reference signal; wherein the identification information of the transmitting device is obtained by: the receiving device uses the local sequence to correlate with the access signal after time domain combination, and obtains the identification information of the sending device corresponding to the access signal through peak detection.

15. The method of claim 1, wherein the access signals repeatedly transmitted in the time domain are identical in position in the frequency domain.

16. An access signal transmission method, applied to a process of a transmission device for transmitting an access signal, wherein the transmission device comprises a base station, the method comprising:

the transmitting equipment transmits an access signal, wherein the access signal is further repeatedly transmitted in a transmission period of repeated transmission of the access signal, so that the access signal is repeatedly transmitted in adjacent or non-adjacent subframes and/or adjacent or non-adjacent symbols, and the adjacent or non-adjacent symbols are in the same subframe or different subframes.

17. The method of claim 16, wherein the access signals repeatedly transmitted in the time domain are identical in position in the frequency domain.

18. The method of claim 16, wherein a repetitive transmission pattern of the access signal in the time domain is agreed by a system or determined by the transmitting device.

19. The method of any one of claims 16 to 18, further comprising:

and the sending equipment sends a timing reference signal on the symbol where the access signal is located.

20. The method of claim 19, wherein there is a correspondence between a timing reference signal and an access signal, or a correspondence between identification information of a timing reference signal and timing information.

21. The method of claim 20, wherein a correspondence existing between the timing reference signal and the access signal is agreed in advance, or the transmitting device notifies the receiving device of the correspondence; or

The corresponding relation existing between the identification information of the timing reference signal and the timing information is agreed in advance, or the sending equipment informs the receiving equipment of the corresponding relation.

22. A receiving apparatus, characterized in that the receiving apparatus comprises a terminal, the receiving apparatus comprising:

the merging module is used for merging the time domain of the access signals;

the detection module is used for detecting the access signals according to the access signals after time domain combination;

23. The receiving device of claim 22, further comprising:

the receiving module is used for receiving the access signal on the target frequency and sampling the access signal; the target frequency is the frequency of the access signal or the search frequency set by the receiving device.

24. The receiving device of claim 22, wherein the merging module is specifically configured to:

carrying out time domain combination on K access signals at the current time and before the current time by a first time length at each set time; the first duration is an access signal combination time interval of the receiving device, and K is a non-zero integer.

25. The receiving device of claim 22, further comprising:

the filtering module is used for filtering the received signals according to the bandwidth and the frequency of the access signals before the time domain combination of the access signals is carried out;

the merging module is specifically configured to: and carrying out time domain combination on the filtered access signals.

26. The receiving device of claim 22, further comprising a processing module configured to perform one or any combination of the following steps:

27. A transmitting device, characterized in that the transmitting device comprises a base station, the transmitting device comprising:

a sending module, configured to send an access signal, where the access signal is further repeatedly sent in a sending period of its repeated sending, so that the access signal is repeatedly sent in an adjacent or non-adjacent subframe and/or on an adjacent or non-adjacent symbol, and the adjacent or non-adjacent symbol is in the same subframe or different subframes.

28. The transmission apparatus of claim 27, wherein the access signals repeatedly transmitted in the time domain are identical in position in the frequency domain.

29. The transmitting device of claim 27 or 28, wherein the transmitting module is further configured to: and sending a timing reference signal on the symbol where the access signal is located.

30. An apparatus for communication, comprising: a transceiver, a processor, and a memory;

the memory to store computer program instructions;

the processor, coupled to the memory, to read the computer program instructions stored by the memory and execute the method of any of claims 1 to 15.

31. An apparatus for communication, comprising: a transceiver, a processor, and a memory;

the memory to store computer program instructions;

the processor, coupled to the memory, to read the computer program instructions stored by the memory and perform the method of any of claims 16 to 21.