CN110495217B

CN110495217B - Discovery signal transmission method, base station and user equipment

Info

Publication number: CN110495217B
Application number: CN201780089502.8A
Authority: CN
Inventors: 任占阳; 张武荣; 李振宇; 韩金侠
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-04-14
Filing date: 2017-04-14
Publication date: 2021-10-01
Anticipated expiration: 2037-04-14
Also published as: WO2018188094A1; CN110495217A

Abstract

The embodiment of the invention provides a transmission method of a discovery signal, a base station and user equipment, and relates to the field of communication. The method comprises the following steps: a base station determines a Physical Cell Identity (PCI) of a physical cell in which User Equipment (UE) is located, and determines a first configuration parameter and a second configuration parameter according to the PCI; the base station determines a first main synchronous signal, a second main synchronous signal and a third main synchronous signal according to the first configuration parameter, and determines a first auxiliary synchronous signal, a second auxiliary synchronous signal and a third auxiliary synchronous signal according to the first configuration parameter and the second configuration parameter; a base station sends a discovery signal to UE through at least two continuous subframes; the discovery signal includes a first primary synchronization signal, a second primary synchronization signal, a third primary synchronization signal, a first secondary synchronization signal, a second secondary synchronization signal, and a third secondary synchronization signal.

Description

Discovery signal transmission method, base station and user equipment

Technical Field

The present application relates to the field of communications, and in particular, to a discovery signal transmission method, a base station, and a user equipment.

Background

In an mf (multefire) system, a base station may schedule a plurality of User Equipments (UEs) in one scheduling unit (e.g., TTI). Generally, a base station can transmit a discovery signal (DRS) to a plurality of UEs only through one subframe, and the signal includes a Primary Synchronization Signal (PSS), an MF primary synchronization signal (MF-PSS), a Secondary Synchronization Signal (SSS), an MF secondary synchronization signal (MF-SSS), and an MF physical broadcast channel (MF-PBCH). The UE receives the DRS and analyzes to obtain PSS, MF-PSS, SSS and MF-SSS so as to obtain Physical Cell Identification (PCI), system bandwidth and other information and complete the clock and frequency synchronization with the base station. The frame structure of the DRS is shown in fig. 1, where DRS occupies one subframe, and PSS, SSS, MF-PSS, and MF-SSS occupy 1 symbol, respectively. In addition, the MF-PBCH occupies 6 Orthogonal Frequency Division Multiplexing (OFDM) symbols.

When the MF system is deployed in a port, a dock, an automated production flow, and other scenes, since the user equipment generally has higher mobility, in the moving process of the user equipment, a wireless signal sent by the base station is easily shielded by various objects between the user equipment and the base station, so that the quality of the wireless signal is poor, and the user equipment may not normally receive the wireless signal; on the other hand, since the number of the user equipments is large, in the moving process, the situation that the wireless signals are mutually shielded is also easy to occur, and the user equipments may not normally receive the data transmitted by the base station. At this time, there is a high demand for the quality of the signal transmitted by the base station, and the base station needs to provide a better wireless coverage capability to cope with the scenario with poor wireless signal quality.

In the existing MF system, the DRS completes transmission in one subframe, and when the UE is in a weak coverage scenario with poor signal quality, a situation that the DRS cannot be normally received occurs. Therefore, the UE cannot acquire the synchronization signal and the MF-PBCH information, and therefore cannot synchronize with the clock and frequency of the base station, cannot acquire the system information, and therefore cannot access the core network through the base station.

Disclosure of Invention

The embodiment of the invention provides a transmission method of a discovery signal, a base station and user equipment, wherein the base station sends the discovery signal to UE through a plurality of continuous subframes in a time domain, so that the UE can also receive the discovery signal sent by the base station in a weak coverage area, further obtain a synchronization signal in the discovery signal, and access a core network through the base station according to the synchronization signal obtained, the clock and the frequency of the base station are synchronous.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, a method for transmitting a discovery signal is disclosed, which includes:

the base station determines a Physical Cell Identity (PCI) of a Physical Cell in which the UE is located, and since the PCI is equal to the first configuration parameter multiplied by 3 plus the second configuration parameter, the base station may determine the first configuration parameter and the second configuration parameter according to the PCI of the Physical Cell. Further, the base station may also determine a first master synchronization signal, a second master synchronization signal, and a third master synchronization signal according to the first configuration parameter; the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal may be determined according to the first configuration parameter and the second configuration parameter. Subsequently, the base station transmits a discovery signal to the UE through at least two consecutive subframes. The discovery signal includes the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal.

In the method provided by the embodiment of the invention, the base station sends the discovery signal to the UE through a plurality of continuous subframes, the discovery signal is enhanced in a time domain, and the limitation of the transmission time of the discovery signal to the receiving effect of the UE is improved. Make the UE in the scene with weaker coverage, such as: the system can still receive discovery signals sent by the base station in weak coverage areas such as factory workshops and ports, and can perform clock synchronization and frequency synchronization with the base station according to the synchronization signals, smoothly access the base station, and communicate with a core network through the base station.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the base station may further determine the first physical broadcast channel according to a system bandwidth, a system frame number, and a subframe number of the starting subframe of the discovery signal; a second physical broadcast channel is determined from the first physical broadcast channel. As such, the discovery signal also includes a first physical broadcast channel and a second physical broadcast channel. It should be noted that the starting subframe of the discovery signal is the first subframe of at least two consecutive subframes in which the discovery signal is transmitted.

In the method provided by the embodiment of the invention, the discovery signal sent by the base station comprises the first physical broadcast channel and the second physical broadcast channel, and the physical broadcast channel is enhanced in the time domain as well.

With reference to the first aspect and any one implementation manner of the first aspect above, in a second possible implementation manner of the first aspect, the determining, by the base station, the second physical broadcast channel according to the first physical broadcast channel specifically includes: and determining the first main system information block carried by the first physical broadcast channel as the second main system information block carried by the second physical broadcast channel.

That is to say, the information carried by the second physical broadcast channel and the information carried by the first physical broadcast channel are the same, and when the UE is in a scene with weak coverage, even if the first physical broadcast channel is not detected, the information such as the system bandwidth and the system frame number can be obtained through the second physical broadcast channel subsequently transmitted by the base station, so that the performance of the discovery signal is enhanced, the reception of the discovery signal by the UE is no longer limited by a short transmission duration, the discovery signal can be detected in the scene with weak coverage, and the UE accesses the base station according to the discovery signal and communicates with the core network through the base station.

With reference to the first aspect and any one implementation manner of the first aspect, in a third possible implementation manner of the first aspect, before the base station determines the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal according to the first configuration parameter, the method further includes: the base station determines a master synchronization signal table, wherein the master synchronization signal table comprises at least one first configuration parameter and three mutually different master synchronization signals corresponding to each first configuration parameter in the at least one first configuration parameter. Or, the master synchronization signal table includes a first master synchronization signal table, a second master synchronization signal table, and a third master synchronization signal table, where the first master synchronization signal table includes at least one first configuration parameter and a first master synchronization signal corresponding to each of the at least one first configuration parameter, the second master synchronization signal table includes at least one first configuration parameter and a second master synchronization signal corresponding to each of the at least one first configuration parameter, and the third master synchronization signal table includes at least one first configuration parameter and a third master synchronization signal corresponding to each of the at least one first configuration parameter.

In specific implementation, the base station may record the corresponding relationship between the first configuration parameter and the root sequence number of the primary synchronization signal in the two manners, so that the base station may obtain the root sequence number of the first primary synchronization signal, the root sequence number of the second primary synchronization signal, and the root sequence number of the third primary synchronization signal by looking up a table after determining the first configuration parameter according to the PCI, and further may determine the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal according to the root sequence number.

With reference to the first aspect and any one implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the determining, by the base station according to the first configuration parameter, the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal specifically includes: and determining three different main synchronous signals corresponding to the first configuration parameter according to a main synchronous signal table by taking the first configuration parameter as an index, and respectively determining the three different main synchronous signals corresponding to the first configuration parameter as a first main synchronous signal, a second main synchronous signal and a third main synchronous signal.

With reference to the first aspect and any one implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the determining, by the base station according to the first configuration parameter, the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal specifically includes: determining a first primary synchronization signal corresponding to the first configuration parameter as a first primary synchronization signal according to a first primary synchronization signal table by taking the first configuration parameter as an index; determining a second main synchronous signal corresponding to the first configuration parameter as a second main synchronous signal according to a second main synchronous signal table by taking the first configuration parameter as an index; and determining a third primary synchronization signal corresponding to the first configuration parameter as a third primary synchronization signal according to a third primary synchronization signal table by taking the first configuration parameter as an index.

With reference to the first aspect and any one implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the determining, by the base station, the first secondary synchronization signal and the second secondary synchronization signal according to the second configuration parameter specifically includes: the base station determines a first auxiliary synchronization signal and a second auxiliary synchronization signal according to the first configuration parameter, the second configuration parameter and the subframe number of the initial subframe of the discovery signal; the first secondary synchronization signal is the same as the second secondary synchronization signal. In a specific implementation, the base station determines two index numbers according to the first configuration parameter and the second configuration parameter, and further obtains a synchronization sequence according to the two index numbers, and uses the synchronization sequence as the first auxiliary synchronization signal or the second auxiliary synchronization signal, that is, the first auxiliary synchronization signal may be the same as the second auxiliary synchronization signal.

In this way, the base station may determine the first secondary synchronization signal and the second secondary synchronization signal after determining the first configuration parameter and the second configuration parameter.

With reference to the first aspect and any one implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the determining the third secondary synchronization signal according to the second configuration parameter specifically includes:

and the base station determines a code sequence according to the subframe offset of the starting subframe of the discovery signal relative to the subframe 0 or the subframe 5 of the system frame, and processes the base sequence according to the code sequence to obtain a third auxiliary synchronization signal. Here, the base sequence may be the first secondary synchronization signal or the second secondary synchronization signal, or the base sequence may be a synchronization sequence determined based on the second configuration parameter.

In this way, when the UE is in a scene with weak coverage, even if the first auxiliary synchronization signal or the second auxiliary synchronization signal is not detected, the UE can still obtain clock synchronization, frequency synchronization, and the like with the base station through the third auxiliary synchronization signal subsequently transmitted by the base station, so that the performance of the discovery signal is enhanced, the UE is no longer limited to a short transmission duration for receiving the discovery signal, the discovery signal can be detected in the scene with weak coverage, the UE accesses the base station according to the discovery signal, and the UE communicates with the core network through the base station.

With reference to the first aspect and any one implementation manner of the first aspect above, in an eighth possible implementation manner of the first aspect, before the base station determines a PCID of a physical cell where the UE is located, the method further includes: the base station generates five mask sequences which are different from each other; the length of the mask sequence is M, M is the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied by the third auxiliary synchronization signal, and the five mask sequences correspond to five different sub-frame offsets; m is an integer of 1 or more.

The starting subframe of the discovery signal is in the first half of the system frame (subframe 0 to subframe 4) or in the second half of the system frame (subframe 5 to subframe 9), the starting subframe is in the first half of the system frame, and the subframe offset relative to subframe 0 of the system frame can be one of five possible values of 0, 1, 2, 3 and 4; similarly, the starting subframe is in the first half of the system frame, and the subframe offset relative to subframe 5 of the system frame may also be one of five possible values, i.e., 0, 1, 2, 3, and 4. In the method provided by the embodiment of the invention, different mask sequences correspond to different sub-frame offsets, and 5 different sub-frame offsets can be indicated by 5 different mask sequences.

With reference to the first aspect and any one implementation manner of the first aspect, in a ninth possible implementation manner of the first aspect, the determining, by the base station, a code sequence according to a subframe offset of a starting subframe relative to a subframe 0 or a subframe 5, and processing the base sequence according to the code sequence to obtain the third secondary synchronization signal specifically includes:

determining a target mask sequence corresponding to the subframe offset of the starting subframe relative to the subframe 0 or the subframe 5; carrying out masking operation on the base sequence according to the jth element in the target mask sequence to obtain a third auxiliary synchronization signal carried on the jth OFDM symbol; the jth OFDM symbol is a jth OFDM symbol of M OFDM symbols occupied by the third secondary synchronization signal, and j is an integer greater than or equal to 1 and less than or equal to M. For example, the third auxiliary synchronization signal occupies 9 OFDM symbols in at least two consecutive subframes in which the discovery signal is transmitted, so that the length of the mask sequence is 9, and the base station performs a masking operation on the base sequence by using a first element in the mask sequence, so as to obtain a synchronization sequence carried on the first OFDM symbol occupied by the third auxiliary synchronization signal, and similarly, the base station performs a masking operation on the base sequence by using a second element in the mask sequence, so as to obtain a synchronization sequence carried on the second OFDM symbol occupied by the third auxiliary synchronization signal, and so on, the third auxiliary synchronization signal may be completely mapped to the corresponding OFDM symbol.

Therefore, when the UE receives the discovery signal, after the discovery signal is detected to obtain the mask sequence, the actual subframe number of the initial subframe of the discovery signal can be mapped according to the mask sequence, and the UE can correctly receive the downlink signal (including the second physical broadcast channel) according to the actual subframe number of the initial subframe.

With reference to the first aspect and any one implementation manner of the first aspect, in a tenth possible implementation manner of the first aspect, the determining, by the base station, a code sequence according to a subframe offset of a starting subframe relative to a subframe 0 or a subframe 5, and processing the base sequence according to the code sequence to obtain the third secondary synchronization signal specifically includes:

the base station shifts the subframe m relative to subframe 0 or subframe 5 according to the starting subframe₂Determining a scrambling sequence of length N, the ith element s (i) in the scrambling sequence satisfying

Scrambling the ith factor in the base sequence according to the ith element of the scrambling sequence to obtain a third secondary synchronization signal; wherein, N is the length of the third auxiliary synchronization signal; n is an integer greater than or equal to 1; i is an integer greater than or equal to 1 and less than or equal to N;

n_sis the slot number of the first slot of the starting sub-frame.

In the method provided by the embodiment of the invention, different mask sequences correspond to different sub-frame offsets, and 5 different sub-frame offsets can be indicated by 5 different scrambling code sequences. Therefore, when the UE receives the discovery signal, after the discovery signal is detected to obtain the mask sequence, the actual subframe number of the initial subframe of the discovery signal can be mapped according to the mask sequence, and the UE can correctly receive the downlink signal according to the actual subframe number of the initial subframe.

With reference to the first aspect and any one of the foregoing implementation manners of the first aspect, in an eleventh possible implementation manner of the first aspect, the at least two consecutive subframes in which the discovery signal is sent include a first time domain interval, a second time domain interval, and a third time domain interval, where the first time domain interval, the second time domain interval, and the third time domain interval are not overlapped with each other, the first time domain interval is located before the second time domain interval, and the second time domain interval is located before the third time domain interval. The first time domain interval is used for the base station to send a first main synchronous signal, a second main synchronous signal, a first auxiliary synchronous signal, a second auxiliary synchronous signal and a first physical broadcast channel; the second time domain interval is used for the base station to send a third primary synchronization signal and a third secondary synchronization signal; the third time domain interval is used for the base station to send a second physical broadcast channel.

That is, the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the first physical broadcast channel are all transmitted before the third primary synchronization signal and the third secondary synchronization signal, and the third primary synchronization signal and the third secondary synchronization signal are transmitted before the second physical broadcast channel. In this way, the synchronization sequence is enhanced first, which is beneficial for the UE to complete all the synchronization sequence detection before demodulating the physical broadcast channel, and since the base station can indicate the actual subframe number of the starting subframe of the discovery signal through the third auxiliary synchronization signal, the UE can determine the actual subframe number of the physical broadcast channel according to the actual subframe number of the starting subframe of the discovery signal before demodulating the physical broadcast channel, so that the base station can perform cell specific reference signal (CRS) scrambling according to the actual subframe number of the physical broadcast channel, without affecting the normal scheduling of the subframe of the physical broadcast channel.

With reference to the first aspect and any one of the foregoing implementation manners of the first aspect, in a twelfth possible implementation manner of the first aspect, the at least two consecutive subframes include a 1 st subframe, a 2 nd subframe, a 3 rd subframe, a 4 th subframe, and a 5 th subframe, and each of the 1 st subframe, the 2 nd subframe, the 3 rd subframe, the 4 th subframe, and the 5 th subframe includes 14 OFDM symbols. The first time domain interval includes: all OFDM symbols in the 1 st subframe except the first two OFDM symbols and the last two OFDM symbols; the second time domain interval includes: the 13 th OFDM symbol of the 1 st subframe, the 14 th symbol of the 1 st subframe and all OFDM symbols except the first two OFDM symbols in the 2 nd subframe; the third time domain interval includes: all OFDM symbols except the first two OFDM symbols in the 3 rd subframe, all OFDM symbols except the first two OFDM symbols in the 4 th subframe, and all OFDM symbols except the first two OFDM symbols in the 5 th subframe.

In some embodiments, the base station is allowed to transmit the discovery signal through 5 consecutive subframes, wherein the first frame includes the existing DRS shown in fig. 1, so that the discovery signal transmitted by the base station may be compatible with the MF1.0 version of the UE. In addition, the enhanced synchronization sequences (i.e., the third secondary synchronization signal and the third primary synchronization signal) are transmitted through the last two OFDM symbols of the first subframe and the second subframe, so that the synchronization signals are enhanced in the time domain. The physical broadcast channel is transmitted through the remaining three subframes, so that the physical broadcast channel is enhanced in the time domain.

With reference to the first aspect and any one of the foregoing implementation manners of the first aspect, in a thirteenth possible implementation manner of the first aspect, a 3 rd OFDM symbol of a 1 st subframe is used to transmit a second secondary synchronization signal, a 4 th OFDM symbol of the 1 st subframe is used to transmit a second primary synchronization signal, a 6 th OFDM symbol of the 1 st subframe is used to transmit a first secondary synchronization signal, a 7 th OFDM symbol of the 1 st subframe is used to transmit a first primary synchronization signal, and OFDM symbols in a first time domain interval except for a previous transmission of the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, and the second secondary synchronization signal are used to transmit a first physical broadcast channel. The 14 th symbol of the 1 st subframe, the 5 th OFDM symbol of the 2 nd subframe, the 8 th OFDM symbol of the 2 nd subframe, the 11 th OFDM symbol of the 2 nd subframe and the 14 th OFDM symbol of the 2 nd subframe are used for transmitting a third master synchronization signal; all OFDM symbols in the second time domain interval except the OFDM symbol for transmitting the third primary synchronization signal are used for transmitting the third secondary synchronization signal; all OFDM symbols included in the third time domain interval are used for the base station to transmit the second physical broadcast channel.

With reference to the first aspect and any one implementation manner of the first aspect, in a fourteenth possible implementation manner of the first aspect, the at least two subframes include a 1 st subframe, a 2 nd subframe, a 3 rd subframe, a 4 th subframe, and a 5 th subframe, and the 1 st subframe, the 2 nd subframe, the 3 rd subframe, the 4 th subframe, and the 5 th subframe each include 14 OFDM symbols. The first time domain interval includes: all OFDM symbols except the first two OFDM symbols and the last two OFDM symbols in the 1 st subframe. The second time domain interval includes: the 13 th OFDM symbol of the 1 st subframe, the 14 th symbol of the 1 st subframe, and all OFDM symbols except the first three OFDM symbols in the 2 nd subframe. The third time domain interval includes: all OFDM symbols except the first three OFDM symbols in the 3 rd subframe, all OFDM symbols except the first two OFDM symbols in the 4 th subframe, and all OFDM symbols except the first two OFDM symbols in the 5 th subframe.

With reference to the first aspect and any one of the foregoing implementation manners of the first aspect, in a fifteenth possible implementation manner of the first aspect, a 3 rd OFDM symbol of a 1 st subframe is used to transmit a second secondary synchronization signal, a 4 th OFDM symbol of the 1 st subframe is used to transmit a second primary synchronization signal, a 6 th OFDM symbol of the 1 st subframe is used to transmit a first secondary synchronization signal, a 7 th OFDM symbol of the 1 st subframe is used to transmit a first primary synchronization signal, and OFDM symbols in a first time domain interval except for a previous transmission of the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, and the second secondary synchronization signal are used to transmit a first physical broadcast channel; the 14 th symbol of the 1 st subframe, the 5 th OFDM symbol of the 2 nd subframe, the 8 th OFDM symbol of the 2 nd subframe, the 11 th OFDM symbol of the 2 nd subframe and the 14 th OFDM symbol of the 2 nd subframe are used for transmitting a third master synchronization signal; all OFDM symbols in the second time domain interval except the OFDM symbol for transmitting the third primary synchronization signal are used for transmitting the third secondary synchronization signal; all OFDM symbols included in the third time domain interval are used for the base station to transmit the second physical broadcast channel.

In a second aspect, a method for transmitting a discovery signal is disclosed, including: the UE receives discovery signals sent by a base station through at least two continuous subframes, wherein the discovery signals comprise a first main synchronization signal, a second main synchronization signal, a third main synchronization signal, a first auxiliary synchronization signal, a second auxiliary synchronization signal and a third auxiliary synchronization signal. Then, the UE decodes the discovery signal to obtain a first primary synchronization signal, a second primary synchronization signal, a third primary synchronization signal, a first auxiliary synchronization signal, a second auxiliary synchronization signal and a third auxiliary synchronization signal; further, the UE determines a first configuration parameter and a second configuration parameter according to the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal, and determines a physical cell identity PCI of a physical cell in which the UE is located according to the first configuration parameter and the second configuration parameter. Of course, the UE may also access the physical cell according to the determined PCI.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the decoding, by the UE, the discovery signal to obtain the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal specifically includes: the UE matches a first primary synchronization signal, a second primary synchronization signal and a third primary synchronization signal corresponding to any one first configuration parameter in a primary synchronization signal table with the discovery signal, and if the matching degree is higher than a first preset threshold, the first configuration parameter is determined as a first configuration parameter; the master synchronization signal table comprises a first master synchronization signal table, a second master synchronization signal table and a third master synchronization signal table, wherein the first master synchronization signal table comprises at least one first configuration parameter and a first master synchronization signal corresponding to each of the at least one first configuration parameter, the second master synchronization signal table comprises at least one first configuration parameter and a second master synchronization signal corresponding to each of the at least one first configuration parameter, and the third master synchronization signal table comprises at least one first configuration parameter and a third master synchronization signal corresponding to each of the at least one first configuration parameter. Or, matching three different primary synchronization signals corresponding to any one first configuration parameter in the primary synchronization signal table with the discovery signal, and determining the first configuration parameter as the first configuration parameter if the matching degree is higher than a first preset threshold; the master synchronization signal table comprises at least one first configuration parameter and three mutually different master synchronization signals corresponding to each of the at least one first configuration parameter.

In specific implementation, the UE pre-stores a master synchronization signal table, determines possible combinations of a first master synchronization signal, a second master synchronization signal, and a second master synchronization signal, matches each combination with a discovery signal, and determines that a first configuration parameter corresponding to the combination is a first configuration parameter obtained by detecting the discovery signal sent by the base station if the matching degree is higher than a preset threshold.

With reference to the second aspect and any one implementation manner of the second aspect, in a second possible implementation manner of the second aspect, after the UE determines the first configuration parameter as the first configuration parameter, the method further includes: determining 2 × Q base sequences according to the subframe number of the starting subframe, the first configuration parameter and Q second configuration parameters in the second configuration parameter set; the base sequences corresponding to each of the Q second configuration parameters are different; acquiring five code sequences, wherein the five code sequences correspond to five different sub-frame offsets; and respectively processing the 2X Q base sequences according to the five code sequences to obtain 10X Q auxiliary synchronous signals.

With reference to the second aspect and any one implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the decoding, by the UE, the discovery signal, and obtaining the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal specifically include: and taking one base sequence in the 2 × Q base sequences as a first auxiliary synchronization signal and a second auxiliary synchronization sequence, taking one auxiliary synchronization signal in the 10 × Q auxiliary synchronization signals as a third auxiliary synchronization signal, and matching the auxiliary synchronization signal with the discovery signal, wherein the matching degree is higher than a second preset threshold, and then determining a second configuration parameter corresponding to the base sequence as a second configuration parameter.

As can be seen, after detecting the first configuration parameter, the UE may detect a second configuration parameter by combining the first configuration parameter, and further may determine the PCI according to the first configuration parameter and the second configuration parameter.

With reference to the second aspect and any one implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the at least two consecutive subframes include a first time domain interval, a second time domain interval, and a third time domain interval, the first time domain interval, the second time domain interval, and the third time domain interval are not overlapped with each other, the first time domain interval is located before the second time domain interval, and the second time domain interval is located before the third time domain interval. The first time domain interval is used for the base station to send a first main synchronous signal, a second main synchronous signal, a first auxiliary synchronous signal, a second auxiliary synchronous signal and a first physical broadcast channel; the second time domain interval is used for the base station to send a third primary synchronization signal and a third secondary synchronization signal; the third time domain interval is used for the base station to send a second physical broadcast channel.

With reference to the second aspect and any one of the foregoing implementation manners of the second aspect, in a fifth possible implementation manner of the second aspect, the method further includes: and detecting a cell-specific reference signal CRS in a third time domain interval, and receiving a second physical broadcast channel.

In a third aspect, a base station is disclosed, comprising:

the determining unit is used for determining a Physical Cell Identity (PCI) of a physical cell where the UE is located, and determining a first configuration parameter and a second configuration parameter according to the PCI; the determining unit is further configured to determine a first primary synchronization signal, a second primary synchronization signal, and a third primary synchronization signal according to the first configuration parameter, and determine a first secondary synchronization signal, a second secondary synchronization signal, and a third secondary synchronization signal according to the first configuration parameter and the second configuration parameter; a transmitting unit, configured to transmit a discovery signal to a UE through at least two consecutive subframes; the discovery signal includes a first primary synchronization signal, a second primary synchronization signal, a third primary synchronization signal, a first secondary synchronization signal, a second secondary synchronization signal, and a third secondary synchronization signal.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the determining is further configured to determine the first physical broadcast channel according to the system bandwidth, the system frame number, and a subframe number of a starting subframe of the discovery signal; determining a second physical broadcast channel according to the first physical broadcast channel;

then the discovery signal also includes the first physical broadcast channel and the second physical broadcast channel.

With reference to the third aspect and any one implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the determining unit is specifically configured to determine the first primary system information block carried by the first physical broadcast channel as the second primary system information block carried by the second physical broadcast channel.

With reference to the third aspect and any one implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the determining unit is further configured to determine a master synchronization signal table before the determining unit determines the first master synchronization signal, the second master synchronization signal, and the third master synchronization signal according to the first configuration parameter, where the master synchronization signal table includes at least one first configuration parameter and three mutually different master synchronization signals corresponding to each of the at least one first configuration parameter; or, the master synchronization signal table includes a first master synchronization signal table, a second master synchronization signal table, and a third master synchronization signal table, where the first master synchronization signal table includes at least one first configuration parameter and a first master synchronization signal corresponding to each of the at least one first configuration parameter, the second master synchronization signal table includes at least one first configuration parameter and a second master synchronization signal corresponding to each of the at least one first configuration parameter, and the third master synchronization signal table includes at least one first configuration parameter and a third master synchronization signal corresponding to each of the at least one first configuration parameter.

With reference to the third aspect and any one of the foregoing implementation manners of the third aspect, in a fourth possible implementation manner of the third aspect, the determining unit is specifically configured to determine, using the first configuration parameter as an index, three different primary synchronization signals corresponding to the first configuration parameter according to the primary synchronization signal table, and determine the three different primary synchronization signals corresponding to the first configuration parameter as the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal, respectively.

With reference to the third aspect and any one implementation manner of the third aspect, in a fifth possible implementation manner of the third aspect, the determining unit is specifically configured to determine, by using the first configuration parameter as an index, according to the first master synchronization signal table, that the first master synchronization signal corresponding to the first configuration parameter is the first master synchronization signal; determining a second main synchronous signal corresponding to the first configuration parameter as a second main synchronous signal according to a second main synchronous signal table by taking the first configuration parameter as an index; and determining a third primary synchronization signal corresponding to the first configuration parameter as a third primary synchronization signal according to a third primary synchronization signal table by taking the first configuration parameter as an index.

With reference to the third aspect and any one implementation manner of the third aspect, in a sixth possible implementation manner of the third aspect, the determining unit is specifically configured to determine, by the base station, the first secondary synchronization signal or the second secondary synchronization signal according to the first configuration parameter, the second configuration parameter, and a subframe number of a starting subframe of the discovery signal; the first secondary synchronization signal is the same as the second secondary synchronization signal.

With reference to the third aspect and any one implementation manner of the third aspect, in a seventh possible implementation manner of the third aspect, the determining unit is specifically configured to determine a code sequence according to a subframe offset of a starting subframe relative to a subframe 0 or a subframe 5, and process a base sequence according to the code sequence to obtain a third secondary synchronization signal; the base sequence is the first secondary synchronization signal or the second secondary synchronization signal, or the base sequence is determined according to the second configuration parameter.

With reference to the third aspect and any one implementation manner of the third aspect, in an eighth possible implementation manner of the third aspect, the determining unit is further configured to determine five mask sequences that are different from each other before determining a PCID of a physical cell where the UE is located; the length of the mask sequence is M, M is the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied by the third auxiliary synchronization signal, and each mask sequence in the five mask sequences corresponds to a subframe offset; m is an integer of 1 or more.

With reference to the third aspect and any one implementation manner of the third aspect, in a ninth possible implementation manner of the third aspect, the determining unit is specifically configured to determine a target mask sequence corresponding to a subframe offset of a starting subframe relative to a subframe 0 or a subframe 5; carrying out masking operation on the base sequence according to the jth element in the target mask sequence to obtain a third auxiliary synchronization signal carried on the jth OFDM symbol; the jth OFDM symbol is a jth OFDM symbol of M OFDM symbols occupied by the third secondary synchronization signal, and j is an integer greater than or equal to 1 and less than or equal to M.

With reference to the third aspect and any one implementation manner of the third aspect, in a tenth possible implementation manner of the third aspect, the determining unit is specifically configured to determine the subframe offset m according to the subframe offset m of the starting subframe relative to the subframe 0 or the subframe 5₂Determining a scrambling sequence of length N, the ith element s (i) in the scrambling sequence satisfying

n_sis the slot number of the first slot of the starting sub-frame.

With reference to the third aspect and any one implementation manner of the third aspect, in an eleventh possible implementation manner of the third aspect, the at least two consecutive subframes include a first time domain interval, a second time domain interval, and a third time domain interval, where the first time domain interval, the second time domain interval, and the third time domain interval are not overlapped with each other, the first time domain interval is located before the second time domain interval, and the second time domain interval is located before the third time domain interval; the first time domain interval is used for the base station to send a first main synchronous signal, a second main synchronous signal, a first auxiliary synchronous signal, a second auxiliary synchronous signal and a first physical broadcast channel; the second time domain interval is used for the base station to send a third primary synchronization signal and a third secondary synchronization signal; the third time domain interval is used for the base station to send a second physical broadcast channel.

With reference to the third aspect and any one implementation manner of the third aspect, in a twelfth possible implementation manner of the third aspect, the at least two consecutive subframes include a 1 st subframe, a 2 nd subframe, a 3 rd subframe, a 4 th subframe, and a 5 th subframe, and each of the 1 st subframe, the 2 nd subframe, the 3 rd subframe, the 4 th subframe, and the 5 th subframe includes 14 OFDM symbols; the first time domain interval includes: all OFDM symbols in the 1 st subframe except the first two OFDM symbols and the last two OFDM symbols; the second time domain interval includes: the 13 th OFDM symbol of the 1 st subframe, the 14 th symbol of the 1 st subframe and all OFDM symbols except the first two OFDM symbols in the 2 nd subframe; the third time domain interval includes: all OFDM symbols except the first two OFDM symbols in the 3 rd subframe, all OFDM symbols except the first two OFDM symbols in the 4 th subframe, and all OFDM symbols except the first two OFDM symbols in the 5 th subframe.

With reference to the third aspect and any one of the foregoing implementation manners of the third aspect, in a thirteenth possible implementation manner of the third aspect, a 3 rd OFDM symbol of a 1 st subframe is used to transmit a second secondary synchronization signal, a 4 th OFDM symbol of the 1 st subframe is used to transmit a second primary synchronization signal, a 6 th OFDM symbol of the 1 st subframe is used to transmit a first secondary synchronization signal, a 7 th OFDM symbol of the 1 st subframe is used to transmit a first primary synchronization signal, and OFDM symbols in a first time domain interval, except for a previous transmission of the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, and the second secondary synchronization signal, are used to transmit a first physical broadcast channel; the 14 th symbol of the 1 st subframe, the 5 th OFDM symbol of the 2 nd subframe, the 8 th OFDM symbol of the 2 nd subframe, the 11 th OFDM symbol of the 2 nd subframe and the 14 th OFDM symbol of the 2 nd subframe are used for transmitting a third master synchronization signal; all OFDM symbols in the second time domain interval except the OFDM symbol for transmitting the third primary synchronization signal are used for transmitting the third secondary synchronization signal; all OFDM symbols included in the third time domain interval are used for the base station to transmit the second physical broadcast channel.

With reference to the third aspect and any one implementation manner of the third aspect, in a fourteenth possible implementation manner of the third aspect, the at least two subframes include a 1 st subframe, a 2 nd subframe, a 3 rd subframe, a 4 th subframe, and a 5 th subframe, and each of the 1 st subframe, the 2 nd subframe, the 3 rd subframe, the 4 th subframe, and the 5 th subframe includes 14 OFDM symbols; the first time domain interval includes: all OFDM symbols in the 1 st subframe except the first two OFDM symbols and the last two OFDM symbols; the second time domain interval includes: the 13 th OFDM symbol of the 1 st subframe, the 14 th symbol of the 1 st subframe and all OFDM symbols except the first three OFDM symbols in the 2 nd subframe; the third time domain interval includes: all OFDM symbols except the first three OFDM symbols in the 3 rd subframe, all OFDM symbols except the first two OFDM symbols in the 4 th subframe, and all OFDM symbols except the first two OFDM symbols in the 5 th subframe.

With reference to the third aspect and any one of the foregoing implementation manners of the third aspect, in a fourteenth possible implementation manner of the third aspect, a 3 rd OFDM symbol of a 1 st subframe is used to transmit a second secondary synchronization signal, a 4 th OFDM symbol of the 1 st subframe is used to transmit a second primary synchronization signal, a 6 th OFDM symbol of the 1 st subframe is used to transmit a first secondary synchronization signal, a 7 th OFDM symbol of the 1 st subframe is used to transmit a first primary synchronization signal, and OFDM symbols in a first time domain interval, except for a previous transmission of the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, and the second secondary synchronization signal, are used to transmit a first physical broadcast channel; the 14 th symbol of the 1 st subframe, the 5 th OFDM symbol of the 2 nd subframe, the 8 th OFDM symbol of the 2 nd subframe, the 11 th OFDM symbol of the 2 nd subframe and the 14 th OFDM symbol of the 2 nd subframe are used for transmitting a third master synchronization signal; all OFDM symbols in the second time domain interval except the OFDM symbol for transmitting the third primary synchronization signal are used for transmitting the third secondary synchronization signal; all OFDM symbols included in the third time domain interval are used for the base station to transmit the second physical broadcast channel.

In a fourth aspect, a UE is disclosed, comprising:

a receiving unit, configured to receive discovery signals sent by a base station on at least two consecutive subframes; the discovery signal comprises a first main synchronization signal, a second main synchronization signal, a third main synchronization signal, a first auxiliary synchronization signal, a second auxiliary synchronization signal and a third auxiliary synchronization signal; a decoding unit, configured to decode the discovery signal to obtain a first primary synchronization signal, a second primary synchronization signal, a third primary synchronization signal, a first secondary synchronization signal, a second secondary synchronization signal, and a third secondary synchronization signal; the determining unit is configured to determine a first configuration parameter and a second configuration parameter according to the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal, and determine a physical cell identity PCI of a physical cell in which the UE is located according to the first configuration parameter and the second configuration parameter.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the determining unit is specifically configured to match a first primary synchronization signal, a second primary synchronization signal, and a third primary synchronization signal, which correspond to any one first configuration parameter in a primary synchronization signal table, with the discovery signal, and determine the first configuration parameter as the first configuration parameter if a matching degree is higher than a first preset threshold; the master synchronization signal table comprises a first master synchronization signal table, a second master synchronization signal table and a third master synchronization signal table, wherein the first master synchronization signal table comprises at least one first configuration parameter and a first master synchronization signal corresponding to each of the at least one first configuration parameter, the second master synchronization signal table comprises at least one first configuration parameter and a second master synchronization signal corresponding to each of the at least one first configuration parameter, and the third master synchronization signal table comprises at least one first configuration parameter and a third master synchronization signal corresponding to each of the at least one first configuration parameter;

or, matching three different primary synchronization signals corresponding to any one first configuration parameter in the primary synchronization signal table with the discovery signal, and determining the first configuration parameter as the first configuration parameter if the matching degree is higher than a first preset threshold; the master synchronization signal table comprises at least one first configuration parameter and three mutually different master synchronization signals corresponding to each of the at least one first configuration parameter.

With reference to the fourth aspect and any implementation manner of the fourth aspect above, in a second possible implementation manner of the fourth aspect, the determining unit is further configured to determine, after determining the first configuration parameter, 2 × Q base sequences according to the subframe number of the starting subframe, the first configuration parameter, and Q second configuration parameters in the second configuration parameter set; the base sequences corresponding to each of the Q second configuration parameters are different; acquiring five code sequences, wherein the five code sequences correspond to five different sub-frame offsets; and respectively processing the 2X Q base sequences according to the five code sequences to obtain 10X Q auxiliary synchronous signals.

With reference to the fourth aspect and any implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the decoding unit is specifically configured to use one base sequence of the 2 × Q base sequences as the first auxiliary synchronization signal and the second auxiliary synchronization sequence, use one auxiliary synchronization signal of the 10 × Q auxiliary synchronization signals as the third auxiliary synchronization signal to match the discovery signal, and determine the second configuration parameter corresponding to the base sequence as the second configuration parameter if the matching degree is higher than a second preset threshold.

With reference to the fourth aspect and any one implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the at least two consecutive subframes include a first time domain interval, a second time domain interval, and a third time domain interval, the first time domain interval, the second time domain interval, and the third time domain interval are not overlapped with each other, the first time domain interval is located before the second time domain interval, and the second time domain interval is located before the third time domain interval; the first time domain interval is used for the base station to send a first main synchronous signal, a second main synchronous signal, a first auxiliary synchronous signal, a second auxiliary synchronous signal and a first physical broadcast channel; the second time domain interval is used for the base station to send a third primary synchronization signal and a third secondary synchronization signal; the third time domain interval is used for the base station to send a second physical broadcast channel.

With reference to the fourth aspect and any implementation manner of the fourth aspect above, in a fifth possible implementation manner of the fourth aspect, a detection unit is further included. The detecting unit is further configured to detect a cell-specific reference signal CRS of a third time domain interval; the receiving unit is further configured to receive a second physical broadcast channel after the detecting unit detects the CRS of the third time domain interval.

In a fifth aspect of the embodiments of the present application, a base station is provided, where the base station may include: at least one processor, a memory, a communication interface, a communication bus;

the at least one processor is connected to the memory and the communication interface through a communication bus, the memory is used for storing computer-executable instructions, and when the server runs, the processor executes the computer-executable instructions stored in the memory, so as to enable the base station to execute the transmission method of the discovery signal of the first aspect or any of the possible implementation manners of the first aspect.

In a sixth aspect of the embodiments of the present application, there is provided a UE, where the UE may include: at least one processor, memory, transceiver;

the at least one processor is connected to the memory and the communication interface through a communication bus, the memory is used for storing computer execution instructions, and when the server runs, the processor executes the computer execution instructions stored in the memory, so that the UE executes the method for transmitting the discovery signal according to the second aspect or any one of the possible implementation manners of the second aspect.

In a seventh aspect of the embodiments of the present application, a computer storage medium is disclosed, which is used for storing computer software instructions for the base station, where the computer software instructions include a program for executing the method for transmitting the discovery signal.

In an eighth aspect of the embodiments of the present application, another computer storage medium is disclosed, for storing computer software instructions for the UE, where the computer software instructions include a program for executing the method for transmitting the discovery signal.

Drawings

Fig. 1 is a schematic diagram of a frame structure of a conventional DRS;

fig. 2 is an architecture diagram of a conventional MF communication system;

fig. 3 is another architecture diagram of a conventional MF communication system;

FIG. 4 is a diagram illustrating a frame structure of a conventional system frame;

fig. 5 is a schematic diagram illustrating a base station according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a frame structure of a discovery signal according to an embodiment of the present invention;

fig. 7 is a schematic diagram of another frame structure of a discovery signal according to an embodiment of the present invention;

fig. 8 is a schematic diagram of another frame structure of a discovery signal according to an embodiment of the present invention;

fig. 9 is a schematic diagram of another frame structure of a discovery signal according to an embodiment of the present invention;

fig. 10 is a schematic diagram of another frame structure of a discovery signal according to an embodiment of the present invention;

fig. 11 is a flowchart illustrating a method for transmitting a discovery signal according to an embodiment of the present invention;

fig. 12 is another schematic diagram of a base station according to an embodiment of the present invention;

FIG. 13 is another schematic diagram of a base station according to an embodiment of the present invention

Fig. 14 is a schematic diagram illustrating a UE according to an embodiment of the present invention;

FIG. 15 is another schematic diagram of a UE according to an embodiment of the present invention;

fig. 16 is another schematic diagram of a UE according to an embodiment of the present invention.

Detailed Description

As shown in fig. 2, in the MF communication system, a base station transmits DRSs to all UEs. The UE communicates with the core network through the base station. The UE may be a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), and so on. As an embodiment, as shown in fig. 2, the UE included in the MF communication system of the present invention is a handset.

Specifically, the base station may combine the formula according to a PCI (Physical Cell Identifier) of a Physical Cell in which the UE is located

Two parameters were determined:

and

further, in the present invention,the base station may be based on

Determining PSS and MF-PSS, according to

And

and determining SSS and MF-SSS, wherein the DRS transmitted to the UE by the base station comprises the PSS, the MF-PSS, the SSS and the MF-SSS. The UE can receive the DRS sent by the base station, determine information such as a clock, a PCI and the like according to the PSS, the MF-PSS, the SSS and the MF-SSS, and access a physical cell served by the base station according to the information and the clock synchronization and the frequency synchronization of the base station, so that the communication is carried out through the base station and a core network.

In general, a base station must complete transmission of a DRS within one subframe, and PSS, MF-PSS, SSS, and MF-SSS occupy OFDM symbols respectively referring to FIG. 1. Limited by a short transmission duration, when the UE is in a weak coverage scenario with poor signal quality, as shown in fig. 3, an obstruction exists between the base station and the UE, the signal fading is severe, and a situation that the UE cannot normally receive the DRS may occur. Therefore, the UE cannot acquire the synchronization signals of the PSS, the MF-PSS, the SSS and the MF-SSS, and cannot perform frequency synchronization and clock synchronization with the base station.

The principle of the embodiment of the invention is as follows: the base station transmits the DRS to the UE through a plurality of continuous subframes in the time domain, the enhancement of the DRS in the time domain is realized, the UE can also receive the DRS transmitted by the base station in a weak coverage area, and then a synchronization signal in the DRS is obtained, and the clock and the frequency of the base station are synchronized according to the obtained synchronization signal. And the coverage range of the MF cell is enlarged, so that when the quality of a wireless signal is poor, the base station is accessed into the core network to realize that the UE can also receive the DRS, and the network access process is completed.

For convenience of understanding, the terms related to the present invention are explained as follows:

and (3) system frame: specifically, as shown in fig. 4, the time length of the system frame may be 10 ms, 1 system frame is composed of 20 slots, each slot is 0.5 ms, and two slots are 1 subframe, that is, the system frame includes 10 subframes, and each subframe is 1 ms in length. When the subframe is a normal Cyclic Prefix (CP), each subframe includes 14 OFDM symbols, and when the extended CP is used, each subframe includes 12 OFDM symbols.

And (3) subframe shifting: which may be referred to as Sf-offset, is used to indicate the offset of a subframe from the first half of the system frame or the second half of the system frame. Referring to fig. 4, the first half of the system frame is sub-frame 0 to sub-frame 4 of the illustrated system frame, and the second half of the system frame is sub-frame 5 to sub-frame 9 of the illustrated system frame. For a signal occupying multiple subframes, the subframe offset of the signal is the offset of the first subframe of the signal. Generally, there are five different cases of subframe offset, 0, 1, 2, 3, 4. Taking the normal CP as an example, when the subframe number of the first subframe of the discovery signal is 3, the offset is 3mod5 — 3; if the subframe number of the first subframe of the discovery signal is 7, then the offset sf-offset is 7mod5 — 2. Where "mod" represents the remainder operation.

In a specific implementation, fig. 5 is a schematic composition diagram of a base station according to an embodiment of the present invention, where the base station may be a base station in the communication system shown in fig. 2. As shown in fig. 5, the base station may include at least one processor 11, a memory 12, a communication interface 13, and a communication bus 14.

The following describes each component of the base station in detail with reference to fig. 5:

the processor 11 is a control center of the base station, and may be a single processor or a collective term for multiple processing elements. For example, the processor 11 is a Central Processing Unit (CPU), and may be an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention, such as: one or more microprocessors (digital signal processors, DSPs), or one or more Field Programmable Gate Arrays (FPGAs).

The processor 11 may perform various functions of the base station by running or executing software programs stored in the memory 12, and calling up data stored in the memory 12, among other things.

In particular implementations, processor 11 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 5, for example, as one embodiment.

In particular implementations, the base station may include multiple processors, such as processor 11 and processor 15 shown in fig. 5, for one embodiment. Each of these processors may be a single-Core Processor (CPU) or a multi-Core Processor (CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The Memory 12 may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these. The memory 12 may be self-contained and coupled to the processor 11 via a communication bus 14. The memory 12 may also be integrated with the processor 11.

Wherein, the memory 12 is used for storing software programs for executing the invention scheme and is controlled by the processor 11 to execute.

The communication interface 13 is any device, such as a transceiver, for communicating with other devices or communication Networks, such as ethernet, Radio Access Network (RAN), Wireless Local Area Networks (WLAN), and so on. The communication interface 13 may include a receiving unit implementing a receiving function and a transmitting unit implementing a transmitting function.

The communication bus 14 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.

The arrangement of the devices shown in fig. 5 does not constitute a limitation of the base station and may comprise more or less components than those shown, or some of the components may be combined, or a different arrangement of components.

In the embodiment of the present invention, the processor 11 of the base station determines the PCI of the physical cell where the UE is located, and determines the first configuration parameter and the second configuration parameter according to the PCI. Furthermore, the processor 11 may determine a first primary synchronization signal, a second primary synchronization signal, and a third primary synchronization signal according to the first configuration parameter, and determine a first secondary synchronization signal, a second secondary synchronization signal, and a third secondary synchronization signal according to the first configuration parameter and the second configuration parameter. Further, the processor 11 transmits a discovery signal to the user equipment through at least two consecutive subframes. It should be noted that the discovery signal sent by the base station includes the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal.

The base station sends the discovery signal to the UE through a plurality of continuous subframes, the discovery signal is enhanced in a time domain, and the limitation of the transmission time of the discovery signal to the receiving effect of the UE is improved. Make the UE in the scene with weaker coverage, such as: the system can still receive discovery signals sent by the base station in weak coverage areas such as factory workshops and ports, and can perform clock synchronization and frequency synchronization with the base station according to the synchronization signals, smoothly access the base station, and communicate with a core network through the base station.

In a specific implementation, a frame structure of at least two consecutive subframes occupied by the discovery signal in a time domain is shown in fig. 6. Referring to fig. 6, the at least two consecutive subframes include a first time domain interval, a second time domain interval, and a third time domain interval. Further, the first time domain interval, the second time domain interval and the third time domain interval are not overlapped with each other. In the time domain, the first time domain interval is located before the second time domain interval, and the second time domain interval is located before the third time domain interval.

In a specific implementation, the first time domain interval is used for the base station to send the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the first physical broadcast channel; the second time domain interval is used for the base station to send the third primary synchronization signal and the third secondary synchronization signal; the third time domain interval is used for the base station to send the second physical broadcast channel. The third primary synchronization signal and the third secondary synchronization signal are also synchronization sequences, and the UE may perform frequency synchronization, clock synchronization, and the like with the base station by detecting the third primary synchronization signal and the third secondary synchronization signal transmitted by the base station.

In the embodiment of the invention, the base station firstly sends the enhanced synchronization signals, namely the third main synchronization signal and the third auxiliary synchronization signal, and then sends the enhanced physical broadcast channel, which is beneficial for the UE to complete the synchronization signal detection before demodulating the physical broadcast channel and obtain the information of timing, PCI, subframe number, frequency deviation correction and the like.

The processor 11 of the base station predetermines the following rules: (1) determining a master synchronization signal table, recording the corresponding relation between the first configuration parameter and the first master synchronization signal, the second master synchronization signal and the third master synchronization signal through the table, wherein the corresponding relation is different

Different first master synchronizing signal, second master synchronizing signal and third master synchronizing signal are corresponded. It should be noted that, in the embodiment of the present invention, the first primary synchronization signal may be a PSS, the second primary synchronization signal may be an MF-PSS, the third primary synchronization signal may be an MF-ePSS, and the first configuration parameter may be an MF-ePSS

It should be noted that the master synchronization signal table may be generated in advance by the base station, or may be stored locally by the base station after being configured in advance by other network devices to the base station, which is not limited herein.

(2) A group of code sequences is determined, and different code sequences have different corresponding sub-frame offsets. The code sequence may be a mask sequence or a scrambling sequence.

In some embodiments, the master synchronization signal table includes at least one first configuration parameter, and three mutually different master synchronization signals corresponding to each of the at least one first configuration parameter. Table 1 below is one possible implementation of the master synchronization signal table described above.

TABLE 1

Referring to table 1, Root Index is a Root sequence number of a synchronization signal. A plurality of synchronization signals (i.e., synchronization sequences) are defined in a protocol or standard, different synchronization signals have different root sequence numbers, and one synchronization signal has only one root sequence number and one root sequence number also has only one synchronization signal. The base station can uniquely determine a synchronization signal according to the root sequence number. In addition, the PSS Root Index in Table 1 is the Root sequence number of the first primary synchronization signal, the MF-PSS Root Index is the Root sequence number of the second primary synchronization signal, and the MF-ePSS Root Index is the Root sequence number of the third synchronization signal. Of course, the root sequence numbers of the first master synchronization signal, the second master synchronization signal, and the third master synchronization signal are not limited to the several possibilities shown in table 1, and in a specific implementation,

the root sequence numbers of the first master synchronization signal, the second master synchronization signal and the third master synchronization signal corresponding to one value of (a) are different from each other.

In some embodiments, the master synchronization signal table includes a first master synchronization signal table, a second master synchronization signal table, and a third master synchronization signal table. The first master synchronization signal table includes at least one first configuration parameter and a first master synchronization signal corresponding to each of the at least one first configuration parameter, the second master synchronization signal table includes at least one first configuration parameter and a second master synchronization signal corresponding to each of the at least one first configuration parameter, and the third master synchronization signal table includes at least one first configuration parameter and a third master synchronization signal corresponding to each of the at least one first configuration parameter. Table 2 below is one possible implementation of the first master synchronization signal table described above, table 3 below is one possible implementation of the second master synchronization signal table, and table 4 below is one possible implementation of the third master synchronization signal table.

TABLE 2

TABLE 3

TABLE 4

In the embodiment of the present invention, the third primary synchronization signal is different from the first and second primary synchronization signals, so that compatibility of supporting MF1.0 can be ensured, that is, a UE that can only receive an existing DRS can only solve the first configuration parameter through the first primary synchronization signal and the second primary synchronization signal, and a UE that receives an enhanced DRS (that is, discovery signals sent by a base station through at least two consecutive base stations in the embodiment of the present invention) can also solve the first configuration parameter through the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal.

In some embodiments, the code sequence is a mask sequence. In a specific implementation, the processor 11 of the base station defines 5 OCC sequences (i.e., the mask sequences) for 5

different subframe offsets

0, 1, 2, 3, and 4. Wherein, different OCC sequences correspond to different subframe offsets. In addition, the length of the OCC sequence is determined according to the number of OFDM symbols occupied by the third synchronization signal, for example, the third auxiliary synchronization signal occupies 9 OFDM symbols, and the length of the OCC sequence is 9. It should be noted that "sequence length" in the embodiments of the present invention refers to the number of elements included in a sequence, such as: the sequence length is 9, i.e. the sequence contains 9 elements. Further, the base station may generate a mapping table shown in table 5 to record the correspondence between the OCC sequence and the subframe offset (sf-offset).

TABLE 5

It should be noted that, in table 5, the subframe offsets corresponding to the 5 different mask sequences are also different, and the mask sequence corresponding to each subframe offset is unique. Of course, one subframe offset may also correspond to multiple mask sequences, and the UE may determine one subframe offset by solving one of the multiple mask sequences. For example, the subframe offset corresponding to OCC sequence 0 and OCC sequence 1 is 0, and the UE may determine the subframe offset 0 no matter whether OCC sequence 0 or OCC sequence 1 is solved. However, one mask sequence cannot correspond to multiple subframe offsets, so that the UE cannot determine which specific subframe offset is indicated by the sequence after solving the mask sequence.

In some embodiments, the code sequence is a scrambling sequence, and the length of the scrambling sequence is the same as the length of the third secondary synchronization signal. In particular, the ith element s (i) in the scrambling sequence satisfies

Wherein the content of the first and second substances,

wherein n is_sIs the slot number, m, of the first slot of the starting subframe₂It is actually the subframe offset of the starting subframe of the above-mentioned discovery signal with respect to subframe 0 or subframe 5. The starting subframe of the discovery signal is the first subframe of at least two consecutive subframes in which the discovery signal is transmitted, subframe 0 is the 1 st subframe of 10 subframes included in the system frame, and subframe 5 is the 6 th subframe of 10 subframes included in the system frame.

In a specific implementation, the processor 11 may query the master synchronization signal table according to the first configuration parameter to determine the first master synchronization signal, the second master synchronization signal, and the third master synchronization signal. Illustratively, the first configuration parameter

A processor 11 and

for indexing, look-up table 1, determine

In the table entry corresponding to 0, the root sequence number of the first master synchronization signal is 25, the root sequence number of the second master synchronization signal is 40, and the root sequence number of the third master synchronization signal is 5. Further, the primary synchronization signal with the root sequence number of 25 may be determined as the first primary synchronization signal, the primary synchronization signal with the root sequence number of 40 may be determined as the second primary synchronization signal, and the primary synchronization signal with the root sequence number of 5 may be determined as the third primary synchronization signal.

Alternatively, the first configuration parameter

A processor 11 and

for indexing, table 2, table 3 and table 4 are looked up. In Table 2, the determination

Taking the root sequence number of the first master synchronization signal corresponding to 1 as 29; in Table 3, the determination

Taking the root sequence number of the second master synchronization signal corresponding to 1 as 44; in Table 3, the determination

The root sequence number of the third primary synchronization signal corresponding to 1 is taken as 10. Further, the primary synchronization signal with the root sequence number of 29 may be determined as a first primary synchronization signal, the primary synchronization signal with the root sequence number of 44 may be determined as a second primary synchronization signal, and the primary synchronization signal with the root sequence number of 10 may be determined as a third primary synchronization signal.

In addition, the processor 11 determines, according to the first configuration parameter and the second configuration parameter, that the first auxiliary synchronization signal, the second auxiliary synchronization signal, and the third auxiliary synchronization signal may specifically be:

firstly, the base station obtains two index numbers m according to the second configuration parameter₀And m₁According to m₀And m₁Determining

And

and generating c according to the first configuration parameter₀(n) and c₁(n) of (a). Further combining the subframe number of the subframe where the first auxiliary synchronization signal or the second auxiliary synchronization signal is located, generating a first auxiliary synchronization signal and a second auxiliary synchronization signal according to the following formula (1); wherein the first secondary synchronization signal and the second secondary synchronization signal are the same.

Wherein n is in the range of [0, 30 ]]I.e. the first secondary synchronization signal or the second secondary synchronization determined by the above stepsThe signal is a length 62 sequence. For example, when n takes 1, two elements in the sequence can be determined, d₀And d₁。

Further, the base station may also determine a code sequence according to the subframe offset of the starting subframe of the discovery signal relative to subframe 0 or subframe 5, and process the base sequence according to the code sequence to obtain a third secondary synchronization signal. Wherein the motif is the first secondary synchronization signal or the second secondary synchronization signal. In some embodiments, the base sequence may also be a synchronization signal different from the first secondary synchronization signal or the second secondary synchronization signal determined according to the second configuration parameter. Specifically, the base station generates t base sequences in advance, where t represents that there are t possible values of the second configuration parameter, and corresponding base sequences of each second configuration parameter in the t base sequences are different.

In a specific implementation, the processing of the base sequence may include the following two cases:

firstly, looking up the table 5 according to the subframe offset of the starting subframe of the discovery signal relative to the subframe 0 or the subframe 5, and determining a target mask sequence corresponding to the subframe offset. And performing masking operation on the base sequence according to the jth element in the target masking sequence to obtain the third auxiliary synchronization signal carried on the jth OFDM symbol.

The jth OFDM symbol is a jth OFDM symbol of M OFDM symbols occupied by the third secondary synchronization signal, and j is an integer greater than or equal to 1 and less than or equal to M. Illustratively, the subframe offset of the starting subframe of the discovery signal with respect to subframe 0 is 1, and the sequence is determined by looking up table 5 with subframe offset 1 as an index:

here, the length of the sequence is 9, that is, the third secondary synchronization signal occupies 9 OFDM symbols; the base sequence is then masked according to the sequence. For example, the base sequence is masked according to the first element 1 in the sequence, that is, the element 1 is multiplied by each element in the base sequence to obtain the third auxiliary synchronization signal carried on the first OFDM symbol in the 9 OFDM symbolsA step signal; according to the second element in the sequence

Masking base sequences, i.e. using elements

And multiplying each element in the base sequence to obtain a third auxiliary synchronization signal which is carried by the second OFDM symbol of the 9 OFDM symbols. By analogy, the third secondary synchronization signal carried on each of the 9 OFDM symbols is obtained, and the third secondary synchronization signal carried on each of the 9 OFDM symbols may be different.

Second, substituting the subframe offset of the starting subframe of the discovery signal with respect to subframe 0 or subframe 5 into the formula

Each element in the scrambling sequence is determined. And scrambling corresponding elements in the base sequence according to the elements to obtain a third auxiliary synchronization signal. The third auxiliary synchronization signal occupies that the third auxiliary synchronization signal carried on each of the 9 OFDM symbols is the same.

For example, the primary synchronization signal is a first secondary synchronization signal or a second secondary synchronization signal, and referring to equation (1), the third secondary synchronization signal can be expressed as equation (2) below, i.e., each element of the first secondary synchronization signal or the second secondary synchronization signal is multiplied by the corresponding scrambling code sequence to obtain the third secondary synchronization signal.

Wherein n has a value range of [0, 30 ]]I.e. the third secondary synchronization signal is a sequence of length 62.

Is the scrambling sequence described above.

In general, the base station may determine the subframe number of the second physical broadcast channel according to the actual subframe number of the starting subframe of the discovery signal, so as to scramble the subframe in which the second physical broadcast channel is located (i.e. the subframe in which the downlink signal is located). If the UE does not obtain the subframe offset after demodulating the third secondary synchronization signal, that is, does not obtain the actual subframe number of the initial subframe of the discovery signal, the UE can only descramble the downlink signal according to subframe 0 or subframe 5. That is, the base station can scramble only the subframe in which the second physical broadcast channel is located according to subframe 0 or subframe 5. Some UEs in the network may descramble according to the actual subframe number, and the UEs may not normally receive the corresponding subframe. In the embodiment of the invention, the base station scrambles or masks the base sequence, and different scrambling code sequences or mask sequences correspond to different subframe offsets. After receiving the third secondary synchronization signal sent by the base station, the UE may decode the third secondary synchronization signal to obtain a scrambling code sequence or a mask sequence, so as to map a subframe offset according to the scrambling code sequence or the mask sequence, where the subframe offset refers to an offset of a starting subframe of the discovery signal with respect to subframe 0 or subframe 5 of the system subframe. And because the third auxiliary synchronization signal is sent before the second physical broadcast channel (refer to fig. 6), the UE maps the subframe offset according to the scrambling code sequence or the mask sequence before demodulating the second physical broadcast channel, so that the actual subframe number of the initial subframe of the discovery signal can be determined according to the obtained subframe offset, and the downlink signals (i.e. all downlink signals carried by the subframe occupied by the third time domain interval shown in fig. 6) are descrambled according to the subframe number.

In addition, the UE obtains two corresponding index numbers m after detecting the SSS/MF-SSS (i.e. the first secondary synchronization signal or the second secondary synchronization signal) successfully₀And m₁From these two index numbers, a second configuration parameter can be derived. After the UE determines the second configuration parameter, the UE can determine the PCI by combining the first configuration parameter, and then the UE can normally demodulate the downlink signal.

In some embodiments, the base station may transmit the discovery signal to the UE through 5ms, that is, the at least two consecutive subframes include 5 consecutive subframes, for example, five consecutive subframes, i.e., a 1 st subframe, a 2 nd subframe, a 3 rd subframe, a 4 th subframe, and a 5 th subframe. In addition, the 1 st, 2 nd, 3 rd, 4 th, and 5 th subframes may each include 14 OFDM symbols.

Further, as shown in fig. 7, the first time domain interval includes: all OFDM symbols except the first two OFDM symbols and the last two OFDM symbols in the 1 st subframe. The second time domain interval comprises: a 13 th OFDM symbol of the 1 st subframe, a 14 th symbol of the 1 st subframe, and all OFDM symbols of the 2 nd subframe except the first two OFDM symbols. The third time domain interval includes: all the OFDM symbols in the 3 rd subframe except the first two OFDM symbols, all the OFDM symbols in the 4 th subframe except the first two OFDM symbols, and all the OFDM symbols in the 5 th subframe except the first two OFDM symbols.

Alternatively, as shown in fig. 8, the first time domain interval includes: all OFDM symbols in the 1 st subframe except the first two OFDM symbols and the last two OFDM symbols; the second time domain interval comprises: a 13 th OFDM symbol of the 1 st subframe, a 14 th symbol of the 1 st subframe, and all OFDM symbols except the first three OFDM symbols in the 2 nd subframe; the third time domain interval includes: all the OFDM symbols in the 3 rd subframe except the first three OFDM symbols, all the OFDM symbols in the 4 th subframe except the first two OFDM symbols, and all the OFDM symbols in the 5 th subframe except the first two OFDM symbols.

In some embodiments, referring to the timing relationship of each time domain interval shown in fig. 7, the base station may transmit each signal with reference to the timing diagram shown in fig. 9. Specifically, the 3 rd OFDM symbol of the 1 st subframe (i.e. OFDM symbol 2 of the 1 st subframe shown in fig. 9) is used for transmitting the second secondary synchronization signal MF-SSS, the 4 th OFDM symbol of the 1 st subframe (i.e. OFDM symbol 3 of the 1 st subframe shown in fig. 9) is used for transmitting the second primary synchronization signal MF-PSS, the 6 th OFDM symbol of the 1 st subframe (i.e. OFDM symbol 5 of the 1 st subframe shown in fig. 9) is used for transmitting the first secondary synchronization signal SSS, and the 7 th OFDM symbol of the 1 st subframe (i.e. OFDM symbol 6 of the 1 st subframe shown in fig. 9) is used for transmitting the first primary synchronization signal PSS. The OFDM symbols in the first time domain interval except for the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, and the second secondary synchronization signal are used for transmitting the first physical broadcast channel PBCH. That is,

OFDM symbols

4, 7, 8, 9, 10, and 11 of the 1 st subframe are used for transmitting PBCH, and

OFDM symbols

0 and 1 of the 1 st subframe are used for transmitting PDCCH.

Referring to fig. 9, the 14 th symbol of the 1 st subframe (OFDM symbol 13 of the 1 st subframe), the 5 th OFDM symbol of the 2 nd subframe (OFDM symbol 4 of the 2 nd subframe), the 8 th OFDM symbol of the 2 nd subframe (OFDM symbol 7 of the 2 nd subframe), the 11 th OFDM symbol of the 2 nd subframe (OFDM symbol 10 of the 2 nd subframe), and the 14 th OFDM symbol of the 2 nd subframe (OFDM symbol 13 of the 2 nd subframe) are used for transmitting the third master synchronization signal MF-ePSS;

the 13 th symbol of the 1 st subframe, the 3 rd, 4 th, 6 th, 7 th, 9 th, 10 th, 12 th and 13 th OFDM symbols of the 2 nd subframe are used for transmitting the third secondary synchronization signal MF-eSSS.

All OFDM symbols included in the third time domain interval are used for the base station to send the second physical broadcast channel MF-ePBCH.

In addition, referring to fig. 9, all 10 OFDM symbols of the at least two consecutive subframes except the OFDM symbols occupied by transmitting the SSS, PSS, MF-SSS, MF-PSS, PBCH, MF-ePSS, MF-eSSS, and MF-ePBC are used for transmitting a Physical Downlink Control Channel (PDCCH).

In some embodiments, referring to the timing relationship of each time domain interval shown in fig. 8, the base station may transmit each signal with reference to the timing diagram shown in fig. 10. Specifically, the 3 rd OFDM symbol of the 1 st subframe is used for transmitting the second secondary synchronization signal MF-SSS, the 4 th OFDM symbol of the 1 st subframe is used for transmitting the second primary synchronization signal MF-PSS, the 6 th OFDM symbol of the 1 st subframe is used for transmitting the first secondary synchronization signal SSS, and the 7 th OFDM symbol of the 1 st subframe is used for transmitting the first primary synchronization signal PSS. In addition, the OFDM symbols in the first time domain interval except for the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, and the second secondary synchronization signal are used for transmitting the first physical broadcast channel PBCH.

Referring to fig. 10, the 14 th symbol of the 1 st subframe, the 5 th OFDM symbol of the 2 nd subframe, the 8 th OFDM symbol of the 2 nd subframe, the 11 th OFDM symbol of the 2 nd subframe, and the 14 th OFDM symbol of the 2 nd subframe are used for transmitting the third master synchronization signal MF-ePSS;

all OFDM symbols in the second time domain interval except the OFDM symbol transmitting the third primary synchronization signal are used to transmit the third secondary synchronization signal, that is, the 13 th symbol of the 1 st subframe, the 4 th, 6 th, 7 th, 9 th, 10 th, 12 th, and 13 th OFDM symbols of the 2 nd subframe are used to transmit the third secondary synchronization signal MF-ess.

All OFDM symbols included in the third time domain interval are used for the base station to send the second physical broadcast channel MF-ePBCH;

in addition, referring to fig. 10, all 14 OFDM symbols of the at least two consecutive subframes except for the OFDM symbols occupied by transmitting SSS, PSS, MF-SSS, MF-PSS, PBCH, MF-ePSS, MF-eSSS, and MF-ePBC are used for transmitting PDCCH.

An embodiment of the present invention further provides a method for transmitting a discovery signal, as shown in fig. 11, where the method includes the following steps:

101. and the base station determines the PCI of the physical cell of the scheduled UE, and determines a first configuration parameter and a second configuration parameter according to the PCI.

Wherein the first configuration parameter

Second configuration parameter

And PCI satisfies:

wherein PCI is in the formula

Therefore, the base station can determine the first configuration parameter according to the PCI

And a second configuration parameter

Optionally, 504 possible PCIs are defined in the standard or protocol, and the 504 possible PCIs are divided into 168 groups in a manner of grouping every three PCIs. Typically, the standard or protocol specifies

For indicating one of the groups 0 to 167, and further,

for indicating one of the groups.

Further optionally, the

Is

0, 1 or 2. The above-mentioned

Is any integer of 0 to 167, and the base station can be one

And a

A PCI is configured.

Exemplary, group 0 PCIs include 0, 1, 2; the PCIs of group 1 include 3, 4, 5

Then

I.e., take the 1 st (counting from 0) PCI in group 0, i.e., 1.

102. The base station determines a first master synchronization signal, a second master synchronization signal and a third master synchronization signal according to the first configuration parameter; and determining a first auxiliary synchronization signal, a second auxiliary synchronization signal and a third auxiliary synchronization signal according to the first configuration parameter and the second configuration parameter.

In a specific implementation, the base station determines, according to table 1, a first primary synchronization signal, a second primary synchronization signal, and a third primary synchronization signal corresponding to the first configuration parameter, using the first configuration parameter as an index. I.e. the table 1 is looked up with the first configuration parameter as an index.

Or, the base station determines the first primary synchronization signal according to the table 2 by using the first configuration parameter as an index, determines the second primary synchronization signal according to the table 3 by using the first configuration parameter as an index, and determines the third primary synchronization signal according to the table 4 by using the first configuration parameter as an index.

In addition, the base station determines the first secondary synchronization signal and the second secondary synchronization signal according to the first configuration parameter and the second configuration parameter in combination with the formula (1). Wherein, the first auxiliary synchronous signal and the second auxiliary synchronous signal are the same.

Further, the base station determines a code sequence, which may be a mask sequence or a scrambling sequence, according to the subframe offset of the discovery signal (including the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal) with respect to subframe 0 or subframe 5 of the system frame. For example, the base station may determine a mask sequence corresponding to the subframe offset by using the subframe offset as an index to look up table 5, or shift the subframe by m₂Substitution into

The ith element in the scrambling code sequence is calculated. Wherein i is an integer greater than or equal to 1 and less than or equal to N, and N is the length of the third secondary synchronization signal, i.e. the third secondary synchronization signalThe number of elements included in the sequence of the secondary synchronization signal. Thus, the base station can determine a scrambling code sequence with the length of N according to the formula.

And then, the base station masks the first auxiliary synchronization signal or the second auxiliary synchronization signal according to the mask sequence to obtain a third auxiliary synchronization signal, or scrambles the first auxiliary synchronization signal or the second auxiliary synchronization signal according to the scrambling sequence to obtain the third auxiliary synchronization signal.

Of course, the base station may also generate a group of sequences in advance before step 101, where the group of sequences includes t different sequences, where the second configuration parameters corresponding to each sequence are different, and the second configuration parameters share possible values in t. Here, the base station may uniquely determine a sequence as a base sequence from the t sequences according to the second configuration parameter, and further may perform masking on the base sequence according to the mask sequence to obtain a third secondary synchronization signal, or perform scrambling on the base sequence according to the scrambling sequence to obtain the third secondary synchronization signal.

103. And the base station sends a discovery signal to the UE through at least two continuous subframes, wherein the discovery signal comprises the first main synchronization signal, the second main synchronization signal, the third main synchronization signal, the first auxiliary synchronization signal, the second auxiliary synchronization signal and the third auxiliary synchronization signal.

In a specific implementation, the discovery signal further includes a first physical broadcast channel and a second physical broadcast channel. The at least two consecutive subframes include a first time domain interval, a second time domain interval, and a third time domain interval, the first time domain interval, the second time domain interval, and the third time domain interval are not overlapped with each other, the first time domain interval is located before the second time domain interval, and the second time domain interval is located before the third time domain interval.

Wherein the first time domain interval is used for the base station to transmit the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the first physical broadcast channel;

the second time domain interval is used for the base station to send the third primary synchronization signal and the third secondary synchronization signal;

the third time domain interval is used for the base station to send the second physical broadcast channel.

104. The UE receives a discovery signal transmitted by a base station on at least two consecutive subframes.

105. The UE decodes the discovery signal to obtain a first primary synchronization signal, a second primary synchronization signal, a third primary synchronization signal, a first secondary synchronization signal, a second secondary synchronization signal and a third secondary synchronization signal, and determines a first configuration parameter and a second configuration parameter according to the synchronization signals.

It should be noted that, before step 104, the UE determines in advance the possible occurrence possibilities of the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal, and determines a plurality of synchronization signal groups, each combination including a first primary synchronization signal, a second primary synchronization signal, a third primary synchronization signal, a first secondary synchronization signal, a second secondary synchronization signal, and a third secondary synchronization signal. And trying to match with the received sequence by using one group, and if the matching is successful (namely the matching degree is higher than a preset threshold), considering the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first auxiliary synchronization signal, the second auxiliary synchronization signal and the third auxiliary synchronization signal in the group as the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first auxiliary synchronization signal, the second auxiliary synchronization signal and the third auxiliary synchronization signal which are included in the discovery signal sent by the base station.

In a specific implementation, before step 104, the UE receives a primary synchronization signal table sent by the base station, where the primary synchronization signal table (refer to table 1 above) includes at least one first configuration parameter and three different primary synchronization signals corresponding to each of the at least one first configuration parameter.

In some embodiments, the master synchronization signal table includes a first master synchronization signal table (refer to table 2 above), a second master synchronization signal table (refer to table 3 above), and a third master synchronization signal table (refer to table 4 above), wherein the first master synchronization signal table includes at least one first configuration parameter and a first master synchronization signal corresponding to each of the at least one first configuration parameter, the second master synchronization signal table includes at least one first configuration parameter and a second master synchronization signal corresponding to each of the at least one first configuration parameter, and the third master synchronization signal table includes at least one first configuration parameter and a third master synchronization signal corresponding to each of the at least one first configuration parameter.

First, the UE may try to match the discovery signal according to the received primary synchronization signal in the primary synchronization signal table, specifically: and the UE matches a first primary synchronization signal, a second primary synchronization signal and a third primary synchronization signal corresponding to any one first configuration parameter in the primary synchronization signal table with the discovery signal, and if the matching degree is higher than a first preset threshold, the first configuration parameter is determined as the first configuration parameter.

Taking table 2, table 3 and table 4 as examples, the first configuration parameter is taken

The UE matches the synchronization sequence of the root sequence number 25, the synchronization sequence of the root sequence number 40, and the synchronization sequence of the root sequence number 5 with the discovery signal, where a matching degree between the synchronization sequence of the root sequence number 25 and the discovery signal is a, a matching degree between the synchronization sequence of the root sequence number 40 and the discovery signal is B, a matching degree between the synchronization sequence of the root sequence number 5 and the discovery signal is C, and when xA + yB + zC is greater than a preset threshold (i.e., the first preset threshold in the embodiment of the present invention), it determines that 0 is the first configuration parameter. Wherein x, y and z are weighting coefficients.

Or, the UE matches three different primary synchronization signals corresponding to any one first configuration parameter in the primary synchronization signal table with the discovery signal, and if the matching degree is higher than the first preset threshold, determines the first configuration parameter as the first configuration parameter.

Taking Table 1 as an example, take a first configuration parameter

The UE matches the synchronization sequence of the root sequence number 29, the synchronization sequence of the root sequence number 44, and the synchronization sequence of the root sequence number 10 with the discovery signal, where a matching degree between the synchronization sequence of the root sequence number 29 and the discovery signal is D, a matching degree between the synchronization sequence of the root sequence number 44 and the discovery signal is E, a matching degree between the synchronization sequence of the root sequence number 10 and the discovery signal is F, and when xD + yE + zF is greater than a preset threshold (i.e., a first preset threshold according to an embodiment of the present invention), it determines that 1 is the first configuration parameter.

Further, the UE may also determine multiple possibilities of the secondary synchronization signal according to the first configuration parameter, which specifically includes: determining 2 × Q base sequences according to the first configuration parameters and Q second configuration parameters in a second configuration parameter set; and the base sequences corresponding to each of the Q second configuration parameters are different. Acquiring five code sequences corresponding to the five different subframe offsets; the code sequence here may be that the UE shifts the subframe by m₂(may be 0, 1, 2, 3, 4) into

The determined 5 scrambling code sequences may also be 5 mask sequences shown in table 5 and transmitted by the base station.

Then, the UE processes the 2 × Q base sequences according to the five code sequences, respectively, to obtain 10 × Q secondary synchronization signals. Then, the UE uses one of the 2 × Q base sequences as the first secondary synchronization signal and the second secondary synchronization sequence, uses one of the 10 × Q secondary synchronization signals as the third secondary synchronization signal, and matches the discovery signal, where a matching degree is higher than a second preset threshold, and determines a second configuration parameter corresponding to the base sequence as the second configuration parameter.

Illustratively, there are 168 second configuration parameters in the second configuration parameter set, according to the aboveThe first configuration parameter and the second configuration parameter determined by the process can determine two index numbers m₀And m₁From the two index numbers, 2 sync sequences can be determined, and thus, one first configuration parameter and 168 second configuration parameters can determine 168 x 2 different sync sequences. The synchronization sequence may be used as the first secondary synchronization signal or the second secondary synchronization signal, and thus there are 168 × 2 possibilities for the first secondary synchronization signal or the second secondary synchronization signal.

In addition, each of the 168 first secondary synchronization signals (or second secondary synchronization signals) is processed according to the 5 mask sequences shown in table 5, and 5 × 168 × 2 possible third secondary synchronization signals are obtained.

The UE may select one sequence 1 from 168 × 2 synchronization sequences as a first secondary synchronization signal, and at the same time, the sequence 1 is also used as a second secondary synchronization signal, and select one sequence 2 from 5 × 168 × 2 possible third secondary synchronization signals, match the sequence 1 and the sequence 2 with the discovery signal, and if the matching degree is higher than a second preset threshold, match a second configuration parameter corresponding to the sequence 1 with the discovery signal

A second configuration parameter obtained for the UE to decode a discovery signal transmitted by the base station is determined.

In addition, the UE may also determine a subframe number range of the starting subframe of the discovery signal (i.e., whether the starting subframe is in a range of subframe 0 to frame 4 or in a range of subframe 5 to subframe 9) according to the matched base sequence. The UE may also look up table 5 according to the matched mask sequence, and may determine the subframe offset of the starting subframe of the discovery signal with respect to subframe 0 or subframe 5 of the system frame. Or, the UE substitutes the ith element in the matched scrambling code sequence into the formula

In (1), m is determined₂I.e. the subframe offset of the starting subframe. Further, the UE may determine the subframe number of the discovery signal start subframe according to the subframe number range and the subframe offset of the start subframe. So-called matched base sequences here, i.e. the UE is attempting to decode the discovery signalWhen the signal is a base sequence included in a combination case where the signal matching degree is found to be higher than a second preset threshold. Similarly, the matched mask sequence is also the mask sequence included in the combined case. The matched scrambling code sequence is also similar meaning, and is not described in detail here.

It should be noted that, for example, a set of sequences is used to try to match with the received sequence in decoding the primary synchronization signal, that is, the UE selects three corresponding primary synchronization signals according to each possible first configuration parameter. And performing sliding correlation calculation by utilizing the time domain sequences of the three main synchronous signals and the received time domain data, and recording a correlation peak value. And if the correlation peak value is larger than a first preset threshold, determining that the first configuration parameter corresponding to the correlation peak value is the first configuration parameter determined by decoding the discovery signal. The "correlation peak" may be the "matching degree" according to the embodiment of the present invention. In some embodiments, the UE may also obtain a correlation peak for each first configuration parameter after traversing all possible first configuration parameters. And if the maximum value of the obtained multiple correlation peak values is greater than a first preset threshold, determining that the first configuration parameter corresponding to the maximum correlation peak value is the first configuration parameter determined by the decoding discovery signal.

Similarly, the UE selects three corresponding secondary synchronization signals according to the first configuration parameter and the second configuration parameter determined in the above steps, performs sliding correlation calculation using the time domain sequences of the three secondary synchronization signals and the received time domain data, and records a correlation peak value. And performing sliding correlation calculation by utilizing the time domain sequences of the three main synchronous signals and the received time domain data, and recording a correlation peak value. And if the correlation peak value is larger than a second preset threshold, determining that a second configuration parameter corresponding to the correlation peak value is a second configuration parameter determined by decoding the discovery signal. Here, the specific matching method is not particularly limited.

In addition, the UE knows a frame structure of the discovery signal sent by the base station in advance (e.g., the frame structure shown in any one of fig. 6 to 10), so that the UE can determine a subframe number where the third time domain interval is located according to the subframe number of the starting subframe of the discovery signal, perform CRS detection on the third time domain interval, and receive a second physical broadcast channel sent by the base station in the third time domain interval.

Further, the UE may configure the first configuration parameter

And a second configuration parameter

Substitution into

In which the PCI of a physical cell is calculated, i.e. in the formula

106. And the UE accesses the base station according to the determined PCI and communicates with the core network through the base station.

Generally, generation of a cell specific reference signal (CRS) and a resource location of a cell specific reference signal (CRS) of a downlink subframe are related to a PCI, and a UE can normally demodulate a downlink signal only after knowing the PCI.

Compared with the prior art, the method for transmitting the discovery signal of the embodiment of the invention has the advantages that the base station sends the discovery signal to the UE through a plurality of continuous subframes on the time domain, so that the UE can also receive the discovery signal sent by the base station in a weak coverage area, further obtain the synchronous signal in the discovery signal, and access the core network through the base station according to the synchronization of the obtained synchronous signal with the clock and the frequency of the base station. In addition, the base station scrambles or masks the base sequence, and different scrambling sequences (or masking sequences) correspond to different subframe offsets. After receiving the third auxiliary synchronization signal sent by the base station, the UE may decode the third auxiliary synchronization signal to obtain a scrambling code sequence or a mask sequence, so as to map a subframe offset according to the scrambling code sequence or the mask sequence, and determine an actual subframe number of the initial subframe of the discovery signal according to the subframe offset, so that the UE can decode the downlink signal according to the actual subframe number, thereby ensuring normal reception of the downlink signal.

The above-mentioned scheme provided by the embodiment of the present application is introduced mainly from the perspective of interaction between network elements. It is to be understood that each network element, for example, the base station and the UE, includes a corresponding hardware structure and/or software module for performing each function in order to implement the above functions. Those of skill in the art will readily appreciate that the present application is capable of hardware or a combination of hardware and computer software implementing the various illustrative algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the base station and the UE may be divided into functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.

In the case of dividing each functional module by corresponding functions, fig. 12 shows a schematic diagram of a possible composition of the base station involved in the above embodiment, as shown in fig. 12, the base station may include: determining unit 201 and transmitting unit 202.

Wherein, the determining unit 201 is configured to support the base station to perform step 101 and step 102 in the transmission method of the discovery signal shown in fig. 11.

A sending unit 202, configured to support the base station to perform step 103 in the transmission method of the discovery signal shown in fig. 11.

It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

The base station provided by the embodiment of the application is used for executing the transmission method of the discovery signal, so that the same effect as the transmission method of the discovery signal can be achieved.

In the case of integrated units, fig. 13 shows another possible schematic composition of the base station involved in the above-described embodiment. As shown in fig. 13, the base station includes: a processing module 301 and a communication module 302.

The processing module 301 is used to control and manage the actions of the server, e.g., the processing module 301 is used to support the base station to perform steps 101, 102 in fig. 11, and/or other processes for the techniques described herein. The communication module 302 is used to support communication between the base station and other network entities, such as the UE shown in fig. 3. The base station may also include a storage module 303 for storing program codes and data for the server.

The processing module 301 may be a processor or a controller. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like. The communication module 302 may be a transceiver, a transceiving circuit or a communication interface, etc. The storage module 83 may be a memory.

When the processing module 301 is a processor, the communication module 302 is a communication interface, and the storage module 303 is a memory, the base station according to the embodiment of the present application may be the base station shown in fig. 5.

In the case of dividing the functional modules according to the respective functions, fig. 14 shows a possible composition diagram of the UE mentioned above and in the embodiment, as shown in fig. 14, the UE may include: receiving section 401, decoding section 402, and determining section 403.

Wherein, the receiving unit 401 is configured to support the UE to execute step 104 in the transmission method of the discovery signal shown in fig. 11.

A decoding unit 402, configured to support the UE to perform the step of decoding the discovery signal in step 105 in the transmission method of the discovery signal shown in fig. 11.

A determining unit 403, configured to support the UE to perform the step of "determining the first configuration parameter and the second configuration parameter" in step 105 of the method for transmitting the discovery signal shown in fig. 11 and the step 106 of the method shown in fig. 11.

The UE provided in the embodiment of the present application is configured to execute the method for transmitting the discovery signal, so that the same effect as that of the method for transmitting the discovery signal can be achieved.

In case of using integrated units, fig. 15 shows another possible composition diagram of the UE involved in the above embodiments. As shown in fig. 15, the UE includes: a processing module 501 and a communication module 502.

The processing module 501 is configured to control and manage actions of the UE. The communication module 502 is used to support communication between the UE and other network entities, such as the base station shown in fig. 3. The UE may also include a storage module 503 for storing program codes and data for the UE.

The processing module 501 may be a processor or a controller. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like. The communication module 502 may be a transceiver, a transceiving circuit or a communication interface, etc. The storage module 503 may be a memory.

When the processing module 501 is a processor, the communication module 502 is a transceiver, and the storage module 503 is a memory, the UE according to the embodiment of the present application may be the UE shown in fig. 16. As shown in fig. 16, the UE includes: a processor 601, a memory 602, a transceiver 603.

Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: flash memory, removable hard drive, read only memory, random access memory, magnetic or optical disk, and the like.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for transmitting discovery signals, comprising:

a base station determines a Physical Cell Identity (PCI) of a physical cell in which User Equipment (UE) is located, and determines a first configuration parameter and a second configuration parameter according to the PCI, wherein the first configuration parameter comprises

The second configuration parameter comprises

The base station determines a first primary synchronization signal, a second primary synchronization signal and a third primary synchronization signal according to the first configuration parameter, determines a first secondary synchronization signal, a second secondary synchronization signal and a third secondary synchronization signal according to the first configuration parameter and the second configuration parameter, wherein the first primary synchronization signal comprises a PSS, the second primary synchronization signal comprises an MF-PSS, the third primary synchronization signal comprises an MF-ePSS, the first secondary synchronization signal comprises an SSS, the second secondary synchronization signal comprises an MF-SSS, and the third secondary synchronization signal comprises an MF-eSSS;

the base station transmits a discovery signal to the UE through at least two consecutive subframes; the discovery signal comprises the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal;

the base station determines a first physical broadcast channel according to the system bandwidth, the system frame number and the subframe number of the initial subframe of the discovery signal; determining a second physical broadcast channel according to the first physical broadcast channel, wherein the first physical broadcast channel comprises PBCH, and the second physical broadcast channel comprises MF-ePBCH;

the discovery signal further includes the first physical broadcast channel and the second physical broadcast channel;

the determining the second physical broadcast channel according to the first physical broadcast channel specifically includes:

and determining the first main system information block carried by the first physical broadcast channel as a second main system information block carried by a second physical broadcast channel.

2. The method of claim 1, wherein before the base station determines the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal according to the first configuration parameter, the method further comprises:

the base station determines a master synchronization signal table;

the master synchronization signal table comprises at least one first preset configuration parameter and three mutually different master synchronization signals corresponding to each first preset configuration parameter in the at least one first preset configuration parameter; or the like, or, alternatively,

the master synchronization signal table comprises a first master synchronization signal table, a second master synchronization signal table and a third master synchronization signal table, wherein the first master synchronization signal table comprises at least one first preset configuration parameter and a first master synchronization signal corresponding to each first preset configuration parameter in the at least one first preset configuration parameter, the second master synchronization signal table comprises at least one first preset configuration parameter and a second master synchronization signal corresponding to each first preset configuration parameter in the at least one first preset configuration parameter, and the third master synchronization signal table comprises at least one first preset configuration parameter and a third master synchronization signal corresponding to each first preset configuration parameter in the at least one first preset configuration parameter.

3. The method of claim 2, wherein the determining, by the base station, the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal according to the first configuration parameter specifically comprises:

and determining three different primary synchronization signals corresponding to the first configuration parameter according to the primary synchronization signal table by using the first configuration parameter as an index, and determining the three different primary synchronization signals corresponding to the first configuration parameter as the first primary synchronization signal, the second primary synchronization signal and the third primary synchronization signal respectively.

4. The method of claim 2, wherein the determining, by the base station, the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal according to the first configuration parameter specifically comprises:

determining a first primary synchronization signal corresponding to the first configuration parameter as the first primary synchronization signal according to the first primary synchronization signal table by taking the first configuration parameter as an index; determining a second primary synchronization signal corresponding to the first configuration parameter as the second primary synchronization signal according to the second primary synchronization signal table by taking the first configuration parameter as an index; and determining a third primary synchronization signal corresponding to the first configuration parameter as the third primary synchronization signal according to the third primary synchronization signal table by taking the first configuration parameter as an index.

5. The method of claim 1, wherein determining the first secondary synchronization signal and the second secondary synchronization signal according to the first configuration parameter and the second configuration parameter specifically comprises:

the base station determines the first auxiliary synchronization signal or the second auxiliary synchronization signal according to the first configuration parameter, the second configuration parameter and the subframe number of the initial subframe of the discovery signal; the first secondary synchronization signal is the same as the second secondary synchronization signal.

6. The method of claim 1, wherein determining the third secondary synchronization signal according to the first configuration parameter and the second configuration parameter specifically comprises:

the base station determines a code sequence according to the subframe offset of the starting subframe relative to the subframe 0 or the subframe 5, and processes a base sequence according to the code sequence to obtain the third auxiliary synchronization signal; the base sequence is the first secondary synchronization signal or the second secondary synchronization signal, or the base sequence is determined according to the second configuration parameter; the starting subframe is a first subframe of at least two consecutive subframes in which the discovery signal is transmitted.

7. The method of claim 6, wherein before the base station determines the PCI of the physical cell in which the UE is located, the method further comprises:

the base station determines five mask sequences which are different from each other; the length of the mask sequence is M, where M is the number of orthogonal frequency division multiplexing OFDM symbols occupied by the third auxiliary synchronization signal, and each of the five mask sequences corresponds to a subframe offset; and M is an integer greater than or equal to 1.

8. The method of claim 7, wherein the base station determines a code sequence according to the subframe offset of the starting subframe relative to subframe 0 or subframe 5, and the processing a base sequence according to the code sequence to obtain the third secondary synchronization signal specifically includes:

determining a target mask sequence corresponding to the subframe offset of the starting subframe relative to subframe 0 or subframe 5;

performing masking operation on the base sequence according to the jth element in the target mask sequence to obtain the third auxiliary synchronization signal carried on the jth OFDM symbol; the jth OFDM symbol is a jth OFDM symbol of M OFDM symbols occupied by the third secondary synchronization signal, and j is an integer greater than or equal to 1 and less than or equal to M.

9. The method of claim 6, wherein the base station determines a code sequence according to the subframe offset of the starting subframe relative to subframe 0 or subframe 5, and wherein processing a base sequence according to the code sequence to obtain the third secondary synchronization signal specifically comprises:

according to the subframe offset m of the starting subframe relative to subframe 0 or subframe 5₂Determining a scrambling sequence of length N, the ith element s (i) in the scrambling sequence satisfying

Scrambling the ith factor in the base sequence according to the ith element of the scrambling sequence to obtain the third secondary synchronization signal;

wherein N is the length of the third secondary synchronization signal; n is an integer greater than or equal to 1; the i is an integer which is more than or equal to 1 and less than or equal to the N;

n is_sIs the slot number of the first slot of the starting subframe.

10. The method according to any one of claims 2 to 9,

the at least two consecutive subframes include a first time domain interval, a second time domain interval, and a third time domain interval, the first time domain interval, the second time domain interval, and the third time domain interval are not overlapped with each other, the first time domain interval is located before the second time domain interval, and the second time domain interval is located before the third time domain interval;

wherein the first time domain interval is used for the base station to transmit the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal and a first physical broadcast channel;

the third time domain interval is used for the base station to send a second physical broadcast channel.

11. The method of claim 10, wherein the at least two consecutive subframes comprise 5 consecutive subframes: a 1 st subframe, a 2 nd subframe, a 3 rd subframe, a 4 th subframe, and a 5 th subframe, wherein the 1 st subframe, the 2 nd subframe, the 3 rd subframe, the 4 th subframe, and the 5 th subframe each include 14 OFDM symbols;

the first time domain interval includes: all OFDM symbols except the first two OFDM symbols and the last two OFDM symbols in the 1 st subframe;

the second time domain interval comprises: a 13 th OFDM symbol of the 1 st subframe, a 14 th symbol of the 1 st subframe, and all OFDM symbols of the 2 nd subframe except the first two OFDM symbols;

the third time domain interval includes: all the OFDM symbols in the 3 rd subframe except the first two OFDM symbols, all the OFDM symbols in the 4 th subframe except the first two OFDM symbols, and all the OFDM symbols in the 5 th subframe except the first two OFDM symbols.

12. The method of claim 11,

the 3 rd OFDM symbol of the 1 st subframe is used for transmitting the second secondary synchronization signal, the 4 th OFDM symbol of the 1 st subframe is used for transmitting the second primary synchronization signal, the 6 th OFDM symbol of the 1 st subframe is used for transmitting the first secondary synchronization signal, the 7 th OFDM symbol of the 1 st subframe is used for transmitting the first primary synchronization signal, and the OFDM symbols except for the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal and the second secondary synchronization signal which are transmitted before in the first time domain interval are used for transmitting the first physical broadcast channel;

the 14 th symbol of the 1 st subframe, the 5 th OFDM symbol of the 2 nd subframe, the 8 th OFDM symbol of the 2 nd subframe, the 11 th OFDM symbol of the 2 nd subframe and the 14 th OFDM symbol of the 2 nd subframe are used for transmitting the third master synchronization signal;

all OFDM symbols in the second time domain interval except the OFDM symbol for transmitting the third primary synchronization signal are used for transmitting the third secondary synchronization signal;

all OFDM symbols included in the third time domain interval are used for the base station to transmit the second physical broadcast channel.

13. The method of claim 10, wherein the at least two consecutive subframes comprise 5 consecutive subframes: a 1 st subframe, a 2 nd subframe, a 3 rd subframe, a 4 th subframe, and a 5 th subframe, wherein the 1 st subframe, the 2 nd subframe, the 3 rd subframe, the 4 th subframe, and the 5 th subframe each include 14 OFDM symbols;

the first time domain interval includes: all OFDM symbols in the 1 st subframe except the first two OFDM symbols and the last two OFDM symbols;

the second time domain interval comprises: a 13 th OFDM symbol of the 1 st subframe, a 14 th symbol of the 1 st subframe, and all OFDM symbols except the first three OFDM symbols in the 2 nd subframe;

the third time domain interval includes: all the OFDM symbols in the 3 rd subframe except the first three OFDM symbols, all the OFDM symbols in the 4 th subframe except the first two OFDM symbols, and all the OFDM symbols in the 5 th subframe except the first two OFDM symbols.

14. The method of claim 13,

15. A method for transmitting discovery signals, comprising:

the method comprises the steps that User Equipment (UE) receives discovery signals sent by a base station on at least two continuous subframes; the discovery signal comprises a first primary synchronization signal, a second primary synchronization signal, a third primary synchronization signal, a first secondary synchronization signal, a second secondary synchronization signal, and a third secondary synchronization signal, the first primary synchronization signal comprises PSS, the second primary synchronization signal comprises MF-PSS, the third primary synchronization signal comprises MF-ePSS, the first secondary synchronization signal comprises SSS, the second secondary synchronization signal comprises MF-SSS, and the third secondary synchronization signal comprises MF-eSSS;

the UE decodes the discovery signal to obtain the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal and the third secondary synchronization signal;

the UE determines a first configuration parameter and a second configuration parameter according to the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first auxiliary synchronization signal, the second auxiliary synchronization signal and the third auxiliary synchronization signal, and determines a Physical Cell Identity (PCI) of a physical cell where the UE is located according to the first configuration parameter and the second configuration parameter, wherein the first configuration parameter comprises

The second configuration parameter comprises

16. The method of claim 15, wherein the UE decoding the discovery signal to obtain the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal specifically comprises:

the UE matches a first primary synchronization signal, a second primary synchronization signal and a third primary synchronization signal corresponding to any one first preset configuration parameter in a primary synchronization signal table with the discovery signal, and if the matching degree is higher than a first preset threshold, the first preset configuration parameter is determined as the first configuration parameter; the master synchronization signal table comprises a first master synchronization signal table, a second master synchronization signal table and a third master synchronization signal table, wherein the first master synchronization signal table comprises at least one first preset configuration parameter and a first master synchronization signal corresponding to each of the at least one first preset configuration parameter, the second master synchronization signal table comprises at least one first preset configuration parameter and a second master synchronization signal corresponding to each of the at least one first preset configuration parameter, and the third master synchronization signal table comprises at least one first preset configuration parameter and a third master synchronization signal corresponding to each of the at least one first preset configuration parameter;

or, matching three mutually different main synchronization signals corresponding to any one first preset configuration parameter in a main synchronization signal table with the discovery signal, and determining the first preset configuration parameter as the first configuration parameter if the matching degree is higher than the first preset threshold; the master synchronization signal table comprises at least one first preset configuration parameter and three mutually different master synchronization signals corresponding to each first preset configuration parameter in the at least one first preset configuration parameter.

17. The method of claim 16, wherein after the UE determines the first preset configuration parameter as the first configuration parameter, the method further comprises:

determining 2 × Q base sequences according to a subframe number of a starting subframe, a first configuration parameter and Q second preset configuration parameters in a second preset configuration parameter set, wherein the starting subframe is a first subframe of at least two continuous subframes for sending the discovery signal; the base sequences corresponding to each of the Q second preset configuration parameters are different;

acquiring five code sequences, wherein the five code sequences correspond to five different subframe offsets, and the subframe offsets are used for indicating the offset of one subframe relative to the first half system frame or the second half system frame;

and respectively scrambling the 2 × Q base sequences according to the five code sequences to obtain 10 × Q auxiliary synchronization signals.

18. The method of claim 17, wherein after the UE decodes the discovery signal to obtain the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal, the method further comprises:

taking one base sequence in the 2 x Q base sequences as the first auxiliary synchronization signal and the second auxiliary synchronization signal, and taking one auxiliary synchronization signal in the 10 x Q auxiliary synchronization signals as the third auxiliary synchronization signal to match with the discovery signal;

and if the matching degree of the third auxiliary synchronization signal and the discovery signal is higher than a second preset threshold, determining the second preset configuration parameter corresponding to the base sequence as the second configuration parameter.

19. The method according to any of claims 15-18, wherein the at least two consecutive subframes comprise a first time domain interval, a second time domain interval, and a third time domain interval, wherein the first time domain interval, the second time domain interval, and the third time domain interval are non-overlapping, wherein the first time domain interval precedes the second time domain interval, and wherein the second time domain interval precedes the third time domain interval;

20. The method of claim 19, further comprising:

and detecting a cell-specific reference signal CRS of the third time domain interval, and receiving the second physical broadcast channel.

21. A base station, comprising:

a determining unit, configured to determine a physical cell identity PCI of a physical cell in which a user equipment UE is located, and determine a first configuration parameter and a second configuration parameter according to the PCI, where the first configuration parameter includes

The second configuration parameterNumber includes

The determining unit is further configured to determine a first primary synchronization signal, a second primary synchronization signal, and a third primary synchronization signal according to the first configuration parameter, determine a first secondary synchronization signal, a second secondary synchronization signal, and a third secondary synchronization signal according to the first configuration parameter and the second configuration parameter, where the first primary synchronization signal includes PSS, the second primary synchronization signal includes MF-PSS, the third primary synchronization signal includes MF-ePSS, the first secondary synchronization signal includes SSS, the second secondary synchronization signal includes MF-SSS, and the third secondary synchronization signal includes MF-eSSS;

a transmitting unit configured to transmit a discovery signal to the UE through at least two consecutive subframes; the discovery signal comprises the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal;

the determining unit is further configured to determine a first physical broadcast channel according to a system bandwidth, a system frame number, and a subframe number of a starting subframe of the discovery signal; determining a second physical broadcast channel according to the first physical broadcast channel, wherein the first physical broadcast channel comprises PBCH, and the second physical broadcast channel comprises MF-ePBCH;

then the discovery signal further includes the first physical broadcast channel and the second physical broadcast channel;

the determining unit is further specifically configured to determine a first primary system information block carried by the first physical broadcast channel as a second primary system information block carried by a second physical broadcast channel.

22. The base station of claim 21,

the determining unit is further configured to determine a master synchronization signal table before the determining unit determines the first master synchronization signal, the second master synchronization signal, and the third master synchronization signal according to the first configuration parameter, where the master synchronization signal table includes at least one first preset configuration parameter and three mutually different master synchronization signals corresponding to each of the at least one first preset configuration parameter; or, the master synchronization signal table includes a first master synchronization signal table, a second master synchronization signal table, and a third master synchronization signal table, wherein the first master synchronization signal table includes at least one first preset configuration parameter and a first master synchronization signal corresponding to each first preset configuration parameter of the at least one first preset configuration parameter, the second master synchronization signal table includes at least one first preset configuration parameter and a second master synchronization signal corresponding to each first preset configuration parameter of the at least one first preset configuration parameter, and the third master synchronization signal table includes at least one first preset configuration parameter and a third master synchronization signal corresponding to each first preset configuration parameter of the at least one first preset configuration parameter.

23. The base station according to claim 22, wherein the determining unit is specifically configured to determine three different primary synchronization signals corresponding to the first configuration parameter from the primary synchronization signal table using the first configuration parameter as an index, and determine the three different primary synchronization signals corresponding to the first configuration parameter as the first primary synchronization signal, the second primary synchronization signal, and the third primary synchronization signal, respectively.

24. The base station according to claim 22, wherein the determining unit is specifically configured to determine, using the first configuration parameter as an index, a first primary synchronization signal corresponding to the first configuration parameter as the first primary synchronization signal according to the first primary synchronization signal table; determining a second primary synchronization signal corresponding to the first configuration parameter as the second primary synchronization signal according to the second primary synchronization signal table by taking the first configuration parameter as an index; and determining a third primary synchronization signal corresponding to the first configuration parameter as the third primary synchronization signal according to the third primary synchronization signal table by taking the first configuration parameter as an index.

25. The base station according to claim 21, characterized in that said determining unit is specifically configured to,

26. The base station according to claim 21, characterized in that said determining unit is specifically configured to,

determining a code sequence according to the subframe offset of the starting subframe relative to the subframe 0 or the subframe 5, and processing a base sequence according to the code sequence to obtain the third auxiliary synchronization signal; the base sequence is the first secondary synchronization signal or the second secondary synchronization signal, or the base sequence is determined according to the second configuration parameter; the starting subframe is a first subframe of at least two consecutive subframes in which the discovery signal is transmitted.

27. The base station of claim 26, wherein the determining unit is further configured to determine five mask sequences different from each other before determining the PCI of the physical cell in which the UE is located; the length of the mask sequence is M, where M is the number of orthogonal frequency division multiplexing OFDM symbols occupied by the third auxiliary synchronization signal, and each of the five mask sequences corresponds to a subframe offset; and M is an integer greater than or equal to 1.

28. The base station according to claim 27, wherein the determining unit is specifically configured to determine a target mask sequence corresponding to a subframe offset of the starting subframe with respect to subframe 0 or subframe 5;

29. The base station according to claim 26, wherein said determining unit is specifically configured to determine the subframe offset m according to the subframe offset of the starting subframe with respect to subframe 0 or subframe 5₂Determining a scrambling sequence of length N, the ith element s (i) in the scrambling sequence satisfying

n is_sIs the slot number of the first slot of the starting subframe.

30. The base station according to any of claims 21-29, wherein said at least two consecutive subframes comprise a first time domain interval, a second time domain interval and a third time domain interval, said first time domain interval, said second time domain interval and said third time domain interval are not overlapping with each other, said first time domain interval is located before said second time domain interval, and said second time domain interval is located before said third time domain interval;

31. The base station of claim 30, wherein the at least two consecutive subframes comprise 5 consecutive subframes: a 1 st subframe, a 2 nd subframe, a 3 rd subframe, a 4 th subframe, and a 5 th subframe, wherein the 1 st subframe, the 2 nd subframe, the 3 rd subframe, the 4 th subframe, and the 5 th subframe each include 14 OFDM symbols;

32. The base station of claim 31, wherein the 3 rd OFDM symbol of the 1 st subframe is used for transmitting the second secondary synchronization signal, the 4 th OFDM symbol of the 1 st subframe is used for transmitting the second primary synchronization signal, the 6 th OFDM symbol of the 1 st subframe is used for transmitting the first secondary synchronization signal, the 7 th OFDM symbol of the 1 st subframe is used for transmitting the first primary synchronization signal, and the OFDM symbols except for the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, and the second secondary synchronization signal transmitted before in the first time domain interval are used for transmitting the first physical broadcast channel;

33. The base station of claim 30, wherein the at least two consecutive subframes comprise 5 consecutive subframes: a 1 st subframe, a 2 nd subframe, a 3 rd subframe, a 4 th subframe, and a 5 th subframe, wherein the 1 st subframe, the 2 nd subframe, the 3 rd subframe, the 4 th subframe, and the 5 th subframe each include 14 OFDM symbols;

34. The base station of claim 33, wherein the 3 rd OFDM symbol of the 1 st subframe is used for transmitting the second secondary synchronization signal, the 4 th OFDM symbol of the 1 st subframe is used for transmitting the second primary synchronization signal, the 6 th OFDM symbol of the 1 st subframe is used for transmitting the first secondary synchronization signal, the 7 th OFDM symbol of the 1 st subframe is used for transmitting the first primary synchronization signal, and the OFDM symbols except for the first primary synchronization signal, the second primary synchronization signal, the first secondary synchronization signal, and the second secondary synchronization signal transmitted before in the first time domain interval are used for transmitting the first physical broadcast channel;

35. A User Equipment (UE), comprising:

a receiving unit, configured to receive discovery signals sent by a base station on at least two consecutive subframes; the discovery signal comprises a first primary synchronization signal, a second primary synchronization signal, a third primary synchronization signal, a first secondary synchronization signal, a second secondary synchronization signal, and a third secondary synchronization signal, the first primary synchronization signal comprises PSS, the second primary synchronization signal comprises MF-PSS, the third primary synchronization signal comprises MF-ePSS, the first secondary synchronization signal comprises SSS, the second secondary synchronization signal comprises MF-SSS, and the third secondary synchronization signal comprises MF-eSSS;

a decoding unit, configured to decode the discovery signal to obtain the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal;

a determining unit, configured to determine a first configuration parameter and a second configuration parameter according to the first primary synchronization signal, the second primary synchronization signal, the third primary synchronization signal, the first secondary synchronization signal, the second secondary synchronization signal, and the third secondary synchronization signal, and determine a physical configuration parameter where the UE is located according to the first configuration parameter and the second configuration parameterA Physical Cell Identity (PCI) of a cell, the first configuration parameter comprising

The second configuration parameter comprises

36. The UE of claim 35, wherein the determining unit is specifically configured to,

matching a first main synchronization signal, a second main synchronization signal and a third main synchronization signal corresponding to any one first preset configuration parameter in a main synchronization signal table with the discovery signal, wherein if the matching degree is higher than a first preset threshold, the first preset configuration parameter is determined as the first configuration parameter; the master synchronization signal table comprises a first master synchronization signal table, a second master synchronization signal table and a third master synchronization signal table, wherein the first master synchronization signal table comprises at least one first preset configuration parameter and a first master synchronization signal corresponding to each of the at least one first preset configuration parameter, the second master synchronization signal table comprises at least one first preset configuration parameter and a second master synchronization signal corresponding to each of the at least one first preset configuration parameter, and the third master synchronization signal table comprises at least one first preset configuration parameter and a third master synchronization signal corresponding to each of the at least one first preset configuration parameter;

37. The UE of claim 36, wherein the determining unit is further configured to determine 2 × Q base sequences according to the subframe number of the starting subframe, the first configuration parameter, and Q second preset configuration parameters in the second preset configuration parameter set after determining the first configuration parameter; the base sequences corresponding to each of the Q second preset configuration parameters are different;

38. The UE of claim 37, wherein the decoding unit is specifically configured to match one of the 2 × Q base sequences as the first secondary synchronization signal and the second secondary synchronization signal, and one of the 10 × Q secondary synchronization signals as the third secondary synchronization signal with the discovery signal;

39. The UE of any one of claims 35-38, wherein the at least two consecutive subframes comprise a first time domain interval, a second time domain interval, and a third time domain interval, wherein the first time domain interval, the second time domain interval, and the third time domain interval are non-overlapping, wherein the first time domain interval precedes the second time domain interval, and wherein the second time domain interval precedes the third time domain interval;

40. The UE of claim 39, further comprising a detection unit,

the detecting unit is further configured to detect a cell-specific reference signal CRS of the third time domain interval;

the receiving unit is further configured to receive the second physical broadcast channel after the detecting unit detects the CRS in the third time domain interval.