CN106304346A - The sending, receiving method of a kind of synchronizing signal and device - Google Patents

Abstract

The present invention relates to the communications field, particularly relate to sending, receiving method and the device of a kind of synchronizing signal, in order to solve the problem that cell measurement present in prior art is obscured, the method is: base station network identity based on network of self home, the Physical Cell Identifier ID of each community according to self administration, is respectively directed to each community and generates corresponding synchronizing signal；Base station is the synchronizing signal distribution running time-frequency resource generated, and each synchronizing signal is transmitted on corresponding running time-frequency resource.And, terminal receives the synchronizing signal that base station sends；Terminal carries out synchronize according to the synchronizing signal received with respective cell.Therefore, when being applied to unauthorized frequency range, even if there being multiple operator to close on deployment with frequency, the synchronizing signal of multiple operators is also different, avoiding problems confounding issues during terminal measurement synchronizing signal, and improves the terminal detection performance to community.

Description

Method and device for sending and receiving synchronization signal

Technical Field

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

Background

In the prior art, synchronization signals in a Long Term Evolution (LTE) system include Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS).

Cell search is a first operation of a User Equipment (UE) entering a cell, and the UE completes a cell search action by searching a synchronization signal sent by a base station for the cell, thereby accessing the cell and completing downlink synchronization with the base station, where the synchronization includes time synchronization and frequency synchronization; the UE can acquire the physical layer cell identifier of the cell by detecting the synchronization signal, and then receives and reads the broadcast information of the cell, and the cell search process of the UE is completed based on the PSS and the SSS sent by the base station.

Specifically, the physical layer cell IDs in the LTE system are 504 in total, and are divided into 168 physical layer cell ID groups, where each group includes 3 physical layer cell IDs. Thus, a physical layer cell ID may be represented by a number representing a physical layer cell group IDAnd a number representing an ID within a physical layer cell groupTo define, among other things,the value range of (1) is 0-167, and the auxiliary synchronization channel carries the data,in the range of 0-2, carried by the primary synchronization channel, i.e.

The existing protocols define 3 PSSs (also called Primary synchronization sequences) that are associated with each physical layer cell Intra-group IDHas a one-to-one mapping relationship. Specifically, the PSS is generated from frequency domain Zadoff-Chu sequences, wherein the root index u of the Zadoff-Chu sequence is equal toThe correspondence of (a) is shown in table 1.

$d_u\left(n\right)=\left\{\begin{array}{cc}{e}^{-j\frac{\mathrm{\πun}(n+1)}{63}}& n=\mathrm{0,1},...,30\\ e^{-j\frac{\mathrm{\πu}(n+1)(n+2)}{63}}& n=\mathrm{31,32},...,61\end{array}\right.$

In the above formula, n is the numerical number in the PSS sequence, and n is 0,1, 2 … 61, indicating that the length of the PSS sequence is 62.

TABLE 1 root sequence number of PSS andcorresponding relationship of

On the other hand, the SSS defined in the existing protocol is formed by cyclically shifting two m sequences with a length of 31, which are referred to as m0 and m1, and the two sequences are combined in a different manner in subframe 0 and subframe 5, specifically as follows:

$d\left(2n\right)=\left\{\begin{array}{cccc}{s}_0^{\left(m_0\right)}\left(n\right)c_0\left(n\right)& \mathrm{in}& \mathrm{subframe}& 0\\ s_1^{\left(m_1\right)}\left(n\right)c_0\left(n\right)& \mathrm{in}& \mathrm{subframe}& 5\end{array}\right.$

$d(2n+1)=\left\{\begin{array}{cccc}{s}_1^{\left(m_1\right)}\left(n\right)c_1\left(n\right)z_1^{\left(m_0\right)}\left(n\right)& \mathrm{in}& \mathrm{subframe}& 0\\ s_0^{\left(m_0\right)}\left(n\right)c_1\left(n\right)z_1^{\left(m_1\right)}\left(n\right)& \mathrm{in}& \mathrm{subframe}& 5\end{array}\right.$

wherein, the physical layer cell group IDDetermined by different combinations of m0 and m1,n is the numerical number of the SSS sequence, as shown in Table 2, wherein, when the 0 th is generatedWhen m0 is a 31-bit m sequence starting from the 0 th bit and m1 is a cyclic shift of the 31-bit m sequence starting from the 1 st bit, the difference between the two sequences is 1 bit, and the 1 st bit is generatedThen, m0 is formed by cyclic shift of 31-bit m sequence starting from bit 1, m1 is formed by cyclic shift of 31-bit m sequence starting from bit 2, the difference between the two is 1 bit, and so on; since the m sequence is 31 bits in total, the m sequence is obtained whenIn this case, m0 is composed of a 31-bit m sequence starting from the 0 th bit, m1 is composed of a cyclic shift of the 31-bit m sequence starting from the 2 nd bit, and the difference between the two sequences is 2 bits from the previous oneDistinguishing, and so on; when in useWhen m0 is composed of a 31-bit m sequence starting from the 0 th bit, m1 is composed of a cyclic shift of the 31-bit m sequence starting from the 3 rd bit, the difference between the two is 3 bits, … …; therefore, by different combinations of m0 and m1, it is possible to represent168 different group values.

TABLE 2 physical layer cell group IDCorresponding relation with m0 and m1

The base station then bases on each physical layer cell ID (i.e., cell ID)) And generating corresponding synchronization signals (including a PSS and a SSS) and respectively transmitting the synchronization signals to the terminal side at corresponding time-frequency positions.

The Time-Frequency position of the transmitted synchronization signal in Frequency Division Duplex (FDD) and Time Division Duplex (TDD) systems is described below.

First, frame structures of FDD and TDD are introduced, respectively.

The frame structure of FDD is shown in fig. 1, and a 10ms radio frame is divided into 10 subframes and 20 slots. The slot numbers are from 0 to 19, with each slot being 0.5 ms.

The frame structure of TDD is shown in fig. 2, where a 10ms radio frame is divided into two half-frames and 10 subframes. Each subframe includes 2 slots. A special subframe is composed of a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP) and an Uplink Pilot Time Slot (UpPTS).

TDD is a time division duplex system, and switching between uplink and downlink is performed in time. TDD has 7 uplink and downlink configurations as shown in Table 3

As shown, subframe 0 and subframe 5 are fixed as downlink subframes, and subframe 1 and subframe 6 are mostly special subframes and at least partially downlink subframes.

TABLE 3 TDD UL-UL configuration

In addition, both the PSS and the SSS occupy 72 subcarriers in the center of the system bandwidth in the frequency domain, so that the frequency domain position is independent of the system bandwidth. Therefore, the UE does not need to know the system bandwidth when detecting the PSS during the cell search process. However, the time domain positions of the PSS and SSS are different in FDD and TDD systems.

Referring to fig. 3, in FDD scheme, PSS occupies slot 0 and the last Orthogonal Frequency Division Multiplexing (OFDM) symbol of slot 10 to transmit in each radio frame, and SSS occupies slot 0 and the second last OFDM symbol of slot 10 to transmit in time domain.

Referring to fig. 4, in TDD mode, PSS occupies subframe 1 and 3 rd OFDM symbol transmission of subframe 6 in each radio frame, and SSS occupies subframe 0 and the last OFDM symbol transmission of subframe 5 in each radio frame.

With the continuous increase of mobile data traffic, spectrum resources are more and more tense, and network deployment and service transmission performed by using authorized spectrum resources cannot meet traffic demands, so that the LTE system can consider to deploy transmission on unauthorized spectrum resources, i.e., extend an Unlicensed long term evolution (U-LTE or LTE-U) system, so as to improve user experience and extend coverage. At present, no clear method exists how to carry out deployment work on unauthorized spectrum resources in an LTE system. The 3GPP organization has already agreed that, in an unlicensed frequency band, a base station needs to transmit a synchronization signal to assist a terminal in cell discovery, and complete functions such as time-frequency coarse synchronization. But there is no clear solution for how to design the synchronization signals of the cells on the unlicensed frequency band.

In the prior art, multiple operators may perform LTE deployment on unlicensed spectrum resources, and cell deployments of multiple operators may adopt the same physical cell ID generation mechanism without coordination, so that a situation that multiple cells with the same physical cell ID are deployed adjacently may occur. Further, when cell detection and Radio Resource Management (RRM) measurement are performed, the UE may measure a signal that is not the operator to which the UE belongs, and report the measurement result to the operator, which may cause cell measurement confusion, reduce cell service quality, and affect the overall system performance.

For example, UE1 is a user of operator a, and on the unlicensed spectrum resources, the base station of operator a transmits a synchronization signal to assist UE1 in cell discovery, under objective conditions, the optimal cell access scheme for the UE1 is to access the operator a-governed cell 8 (i.e., physically closest to the operator a-governed cell 8), however, since the operator B also transmits the synchronization signal in the same way on this unlicensed spectrum resource, and the UE1 is now well within the coverage of the cell 10 under the jurisdiction of the operator B, therefore, if the UE1 receives the synchronization signal of the cell 10 administered by the operator B, and analyzes the received synchronization signal to obtain that the UE itself should access the cell 10 administered by the operator B, the feedback response message thus feeds back the physical cell ID of the cell 10 administered by the operator B to the base station of the operator a.

Therefore, because the physical cell ID generation mechanisms adopted among different operators are the same, the base station of operator a mistakenly considers that UE1 should be accessed to the cell 10 governed by operator a according to the response message fed back by UE1, and at this time, the cell 10 governed by operator a is far away from UE1, so that UE1 cannot be correctly accessed to the optimal cell governed by operator a, which results in reduced service quality and affects the overall system performance.

Disclosure of Invention

The embodiment of the invention provides a method and a device for sending and receiving a synchronization signal, which are used for solving the problem of cell measurement confusion in the prior art.

The embodiment of the invention provides the following specific technical scheme:

a method of transmitting a synchronization signal, comprising:

the base station generates corresponding synchronous signals aiming at each cell according to the physical cell identification ID of each cell managed by the base station on the basis of the network identification of the home network of the base station;

and the base station allocates time-frequency resources for the generated synchronous signals and sends each synchronous signal on the corresponding time-frequency resource.

Therefore, when the method is applied to the unauthorized frequency band, even if a plurality of operators are deployed nearby with the same frequency, the synchronous signals of the operators are different, so that the problem of confusion when the terminal measures the synchronous signals is avoided. In addition, the first PSS and the first SSS and at least one group of second PSS and second SSS are adopted simultaneously, so that the detection performance and RRM measurement performance of the terminal on the cell can be improved.

Optionally, the generating, by the base station, a corresponding synchronization signal for a cell according to a physical cell ID of the cell based on the network identifier of the home network of the base station includes:

a base station generates a first Primary Synchronization Signal (PSS) and a first Secondary Synchronization Signal (SSS) of the cell based on a first mapping relation defined by an existing protocol according to a physical cell ID of the cell;

a base station generates at least one group of second PSS and second SSS of one cell based on a set second mapping relation according to a physical cell ID of the cell, wherein the second mapping relation is the same as or different from the first mapping relation, represents a mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents a mapping relation between an intra-physical cell group ID in the physical cell ID and a root index of the composition sequence;

and the base station generates a scrambling code sequence based on the network identification of the home network of the base station, and scrambles at least the group of second PSS and second SSS by adopting the scrambling code sequence.

Optionally, the generating, by the base station, a scrambling sequence based on the network identifier of the home network of the base station, and scrambling at least the group of the second PSS and the second SSS by using the scrambling sequence includes:

the base station generates a scrambling sequence based on the network identification of the home network of the base station, and scrambles the first PSS and the first SSS, and each group of second PSS and second SSS in sequence according to a set sequence by adopting the scrambling sequence; or,

and the base station generates a scrambling sequence based on the network identification of the home network of the base station, and scrambles each group of the second PSS and the second SSS in sequence according to a set sequence by adopting the scrambling sequence.

Optionally, the generating, by the base station, a corresponding synchronization signal for a cell according to a physical cell ID of the cell based on the network identifier of the home network of the base station includes:

a base station generates a first PSS and a first SSS of the cell based on the first mapping relation defined by the existing protocol according to the physical cell ID of the cell;

the base station acquires mapping parameters set corresponding to a network identifier of a self home network, acquires at least one corresponding type of third mapping relation based on the mapping parameters, and generates at least one group of second PSS and second SSS of the cell based on the at least one type of third mapping relation, wherein the same type of third mapping relation or different type of third mapping relation is adopted between the second PSS and the second SSS of different groups, the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents the mapping relation between a physical cell group ID in the physical cell ID and a root index of the composition sequence.

Optionally, the base station allocates time-frequency resources for the generated synchronization signal, including:

the base station allocates time-frequency resources for the first PSS and the first SSS based on the existing protocol, or allocates newly defined time-frequency resources for the first PSS and the first SS;

the base station allocates time-frequency resources different from the first PSS and the first SSS for the at least one group of second PSS and second SSS; or the base station allocates the same time-frequency resources as the first PSS for a second PSS in the at least one group of second PSS and second SSS, and allocates time-frequency resources different from the first SSS for a second SSS in the at least one group of second PSS and second SSS.

Optionally, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

Optionally, when the base station allocates time-frequency resources different from the first PSS and the first SSS to the at least one set of the second PSS and the second SSS, the base station may implement multiplexing between the time-frequency resources allocated to the first PSS and the first SSS and the time-frequency resources allocated to the at least one set of the second PSS and the second SSS in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner;

and when the base station allocates the time-frequency resources which are the same as the first PSS for the second PSS in the at least one group of second PSS and second SSS and the time-frequency resources which are different from the first SSS for the second SSS in the at least one group of second PSS and second SSS, the base station allocates the time-frequency resources for the first SSS and the time-frequency resources for the second SSS in the at least one group of second PSS and second SSS to realize multiplexing in a TDM mode or/and an FDM mode.

Optionally, a distribution sequence and a time interval between time-frequency resource locations occupied by each group of the second PSS and the second SSS are the same as or different from a distribution sequence and a time interval between time-frequency resource locations occupied by the first PSS and the first SSS.

Optionally, further comprising:

the base station appoints the characteristic information of the synchronizing signal with the terminal side in advance, wherein the characteristic information at least comprises the generation mode of the synchronizing signal, the distribution mode of time-frequency resources and the transmission period; or,

before sending the synchronous signal, the base station informs the terminal side of the characteristic information of the synchronous signal through a high-level signaling, wherein the characteristic information at least comprises a generation mode of the synchronous signal, an allocation mode of time-frequency resources and an emission period.

Optionally, when the base station sends the synchronization signal, the synchronization signal carries a cell-specific pilot signal CRS or a channel state information reference signal CSI-RS.

A method of receiving a synchronization signal, comprising:

a terminal receives a synchronous signal sent by a base station; the base station generates a synchronization signal aiming at a corresponding cell according to a physical cell Identification (ID) of the cell administered by the base station based on a network identification of a home network of the base station;

and the terminal synchronizes with the corresponding cell according to the received synchronizing signal.

Therefore, when the method is applied to the unauthorized frequency band, even if a plurality of operators are deployed nearby with the same frequency, the synchronous signals of the operators are different, so that the problem of confusion when the terminal measures the synchronous signals is avoided. In addition, the first PSS and the first SSS and at least one group of second PSS and second SSS are adopted simultaneously, so that the detection performance and RRM measurement performance of the terminal on the cell can be improved.

Optionally, the synchronization signals received by the terminal include a first primary synchronization signal PSS and a first secondary synchronization signal SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by the base station based on a first mapping relation defined by an existing protocol, the at least one set of second PSS and second SSS is generated by the base station based on a set second mapping relation, and the at least one set of second PSS and second SSS is scrambled by the base station by adopting a scrambling sequence, wherein the scrambling sequence is generated by the base station based on a network identification of a home network of the base station; wherein the second mapping relation is the same as or different from the first mapping relation, and represents a mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents a mapping relation between an intra-physical cell group ID and a root index of the composition sequence in the physical cell ID.

Optionally, the scrambling by the base station using the scrambling sequence for at least the at least one set of the second PSS and the second SSS includes:

the first PSS and the first SSS, and each group of the second PSS and the second SSS are scrambled by the base station in sequence according to a set sequence by adopting the scrambling code sequence; or,

and each group of the second PSS and the second SSS is scrambled by the base station in sequence according to a set sequence by adopting the scrambling code sequence.

Optionally, the synchronization signal received by the terminal includes a first PSS and a first SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by a base station based on a first mapping relation defined by an existing protocol, the at least one group of second PSS and second SSS is generated by the base station based on at least one type of third mapping relation corresponding to preset mapping parameters, and the mapping parameters are set corresponding to network identifiers of a home network of the base station; and the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between the physical cell group ID and the composition sequence in the physical cell ID, and represents the mapping relation between the physical cell group ID and the root index of the composition sequence in the physical cell ID.

Optionally, further comprising:

the time frequency resource occupied by the terminal receiving the synchronous signal is distributed by the base station; wherein,

the time-frequency resources occupied by the first PSS and the first SSS are time-frequency resources allocated by the base station based on the existing protocol, or time-frequency resources newly defined by the base station;

the time-frequency resources occupied by the at least one group of second PSS and second SSS are different from the time-frequency resources occupied by the first PSS and first SSS; or the second PSS in the at least one set of second PSS and second SSS occupies the same time-frequency resources as the first PSS, and the second SSS in the at least one set of second PSS and second SSS occupies different time-frequency resources from the first SSS.

Optionally, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

Optionally, when the at least one set of second PSS and second SSS occupy time-frequency resources different from the first PSS and first SSS, the time-frequency resources occupied by the first PSS and first SSS and the time-frequency resources occupied by the at least one set of second PSS and second SSS implement multiplexing in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner;

and when the second PSS in the at least one group of second PSS and second SSS occupies time-frequency resources different from the first SSS, multiplexing is realized by a TDM mode or/and an FDM mode through the time-frequency resources occupied by the first SSS and the time-frequency resources occupied by the second SSS in the at least one group of second PSS and second SSS.

Optionally, a distribution sequence and a time interval between time-frequency resource locations occupied by each group of the second PSS and the second SSS are the same as or different from a distribution sequence and a time interval between time-frequency resource locations occupied by the first PSS and the first SSS.

Optionally, further comprising:

in the synchronization process, the terminal acquires a cell-specific pilot signal CRS or a channel state information reference signal CSI-RS from the synchronization signal, performs RRM measurement based on the CRS or the CSI-RS, and reports the measurement result to the base station.

A transmission apparatus of a synchronization signal, comprising:

a generating unit, configured to generate, based on a network identifier of a home network of the mobile terminal, a corresponding synchronization signal for each cell according to a physical cell identifier ID of each cell administered by the mobile terminal;

and the sending unit is used for distributing time-frequency resources for the generated synchronous signals and sending each synchronous signal on the corresponding time-frequency resource.

Therefore, when the method is applied to the unauthorized frequency band, even if a plurality of operators are deployed nearby with the same frequency, the synchronous signals of the operators are different, so that the problem of confusion when the terminal measures the synchronous signals is avoided. In addition, the first PSS and the first SSS and at least one group of second PSS and second SSS are adopted simultaneously, so that the detection performance and RRM measurement performance of the terminal on the cell can be improved.

Optionally, when generating a corresponding synchronization signal for a cell according to a physical cell ID of the cell based on a network identifier of a home network of the cell, the generating unit is configured to:

generating a first Primary Synchronization Signal (PSS) and a first Secondary Synchronization Signal (SSS) of the cell based on a first mapping relation defined by an existing protocol according to a physical cell ID of the cell;

generating at least one set of a second PSS and a second SSS of the cell based on a set second mapping relation according to the physical cell ID of the cell, wherein the second mapping relation is the same as or different from the first mapping relation, and represents the mapping relation between the physical cell group ID and the composition sequence in the physical cell ID and the mapping relation between the intra-physical cell group ID in the physical cell ID and the root index of the composition sequence;

and generating a scrambling code sequence based on the network identification of the home network of the user, and scrambling at least the group of the second PSS and the second SSS by adopting the scrambling code sequence.

Optionally, the generating unit is configured to generate a scrambling sequence based on a network identifier of a home network of the generating unit, and when the scrambling sequence is used to scramble at least the group of the second PSS and the second SSS, the generating unit is configured to:

generating a scrambling sequence based on a network identifier of a self-owned network, and scrambling the first PSS and the first SSS, and each group of the second PSS and the second SSS in sequence according to a set sequence by adopting the scrambling sequence; or,

and generating a scrambling sequence based on the network identification of the home network, and respectively scrambling each group of the second PSS and the second SSS in sequence according to a set sequence by adopting the scrambling sequence.

Optionally, when generating a corresponding synchronization signal for a cell according to a physical cell ID of the cell based on a network identifier of a home network of the cell, the generating unit is configured to:

generating a first PSS and a first SSS of the cell based on the first mapping relation defined by the existing protocol according to the physical cell ID of the cell;

the method comprises the steps of obtaining mapping parameters corresponding to network identification of a home network of the cell, obtaining at least one corresponding type of third mapping relation based on the mapping parameters, and generating at least one group of second PSS and second SSS of the cell based on the at least one type of third mapping relation, wherein the same type of third mapping relation or different type of third mapping relation is adopted between the second PSS and the second SSS of different groups, the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents the mapping relation between a physical cell group ID in the physical cell ID and a root index of the composition sequence.

Optionally, when allocating time-frequency resources for the generated synchronization signal, the sending unit is configured to:

allocating time-frequency resources to the first PSS and the first SSS based on an existing protocol, or allocating newly defined time-frequency resources to the first PSS and the first SS;

allocating time-frequency resources, different from the first PSS and first SSS, for the at least one set of second PSS and second SSS; or the base station allocates the same time-frequency resources as the first PSS for a second PSS in the at least one group of second PSS and second SSS, and allocates time-frequency resources different from the first SSS for a second SSS in the at least one group of second PSS and second SSS.

Optionally, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

Optionally, further comprising:

a multiplexing unit, configured to implement multiplexing in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner, when allocating time-frequency resources different from the first PSS and the first SSS for the at least one set of second PSS and the second SSS, the time-frequency resources allocated for the first PSS and the first SSS, and the time-frequency resources allocated for the at least one set of second PSS and the second SSS;

and the base station is configured to allocate, to a second PSS in the at least one set of second PSS and second SSS, time-frequency resources that are the same as the first PSS, and allocate, to a second SSS in the at least one set of second PSS and second SSS, time-frequency resources that are different from the first SSS, and the time-frequency resources allocated by the base station to the first SSS and the time-frequency resources allocated to the second SSS in the at least one set of second PSS and second SSS implement multiplexing in a TDM manner or/and an FDM manner.

Optionally, a distribution sequence and a time interval between time-frequency resource locations occupied by each group of the second PSS and the second SSS are the same as or different from a distribution sequence and a time interval between time-frequency resource locations occupied by the first PSS and the first SSS.

Optionally, further comprising:

the notification unit is used for appointing the characteristic information of the synchronous signal with a terminal side in advance, and the characteristic information at least comprises a generation mode of the synchronous signal, a distribution mode of time-frequency resources and a transmission period; or,

before sending the synchronization signal, the method is used for notifying the terminal side of the characteristic information of the synchronization signal through a high-level signaling, wherein the characteristic information at least comprises a generation mode of the synchronization signal, an allocation mode of time-frequency resources and an emission period.

Optionally, the sending unit is further configured to:

when a synchronization signal is transmitted, the synchronization signal carries a CRS or a CSI-RS.

A receiving apparatus of a synchronization signal, comprising:

a receiving unit, configured to receive a synchronization signal sent by a base station; the base station generates a synchronization signal aiming at a corresponding cell according to a physical cell Identification (ID) of the cell administered by the base station based on a network identification of a home network of the base station;

and the synchronization unit is used for synchronizing with the corresponding cell according to the received synchronization signal.

Therefore, when the method is applied to the unauthorized frequency band, even if a plurality of operators are deployed nearby with the same frequency, the synchronous signals of the operators are different, so that the problem of confusion when the terminal measures the synchronous signals is avoided. In addition, the first PSS and the first SSS and at least one group of second PSS and second SSS are adopted simultaneously, so that the detection performance and RRM measurement performance of the terminal on the cell can be improved.

Optionally, the synchronization signals received by the receiving unit include a first primary synchronization signal PSS and a first secondary synchronization signal SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by the base station based on a first mapping relation defined by an existing protocol, the at least one set of second PSS and second SSS is generated by the base station based on a set second mapping relation, and the at least one set of second PSS and second SSS is scrambled by the base station by adopting a scrambling sequence, wherein the scrambling sequence is generated by the base station based on a network identification of a home network of the base station; wherein the second mapping relation is the same as or different from the first mapping relation, and represents a mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents a mapping relation between an intra-physical cell group ID and a root index of the composition sequence in the physical cell ID.

Optionally, the scrambling by the base station using the scrambling sequence for at least the at least one set of the second PSS and the second SSS includes:

the first PSS and the first SSS, and each group of the second PSS and the second SSS are scrambled by the base station in sequence according to a set sequence by adopting the scrambling code sequence; or,

and each group of the second PSS and the second SSS is scrambled by the base station in sequence according to a set sequence by adopting the scrambling code sequence.

Optionally, the synchronization signal received by the receiving unit includes a first PSS and a first SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by a base station based on a first mapping relation defined by an existing protocol, the at least one group of second PSS and second SSS is generated by the base station based on at least one type of third mapping relation corresponding to preset mapping parameters, and the mapping parameters are set corresponding to network identifiers of a home network of the base station; and the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between the physical cell group ID and the composition sequence in the physical cell ID, and represents the mapping relation between the physical cell group ID and the root index of the composition sequence in the physical cell ID.

Optionally, further comprising:

the time frequency resource occupied by the receiving unit for receiving the synchronous signal is distributed by the base station; wherein,

the time-frequency resources occupied by the first PSS and the first SSS are time-frequency resources allocated by the base station based on the existing protocol, or time-frequency resources newly defined by the base station;

the time-frequency resources occupied by the at least one group of second PSS and second SSS are different from the time-frequency resources occupied by the first PSS and first SSS; or the second PSS in the at least one set of second PSS and second SSS occupies the same time-frequency resources as the first PSS, and the second SSS in the at least one set of second PSS and second SSS occupies different time-frequency resources from the first SSS.

Optionally, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

Optionally, when the at least one set of second PSS and second SSS occupy time-frequency resources different from the first PSS and first SSS, the time-frequency resources occupied by the first PSS and first SSS and the time-frequency resources occupied by the at least one set of second PSS and second SSS implement multiplexing in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner;

and when the second PSS in the at least one group of second PSS and second SSS occupies time-frequency resources different from the first SSS, multiplexing is realized by a TDM mode or/and an FDM mode through the time-frequency resources occupied by the first SSS and the time-frequency resources occupied by the second SSS in the at least one group of second PSS and second SSS.

Optionally, a distribution sequence and a time interval between time-frequency resource locations occupied by each group of the second PSS and the second SSS are the same as or different from a distribution sequence and a time interval between time-frequency resource locations occupied by the first PSS and the first SSS.

Optionally, further comprising:

and the measurement unit is used for acquiring a cell-specific pilot signal CRS or a channel state information reference signal CSI-RS from the synchronization signal in the synchronization process, performing RRM measurement based on the CRS or the CSI-RS, and reporting the measurement result to the base station.

The transmitting device of the synchronizing signal comprises a processor, a transceiver and a memory, wherein:

a processor for reading the program in the memory, performing the following processes:

respectively generating corresponding synchronous signals aiming at each cell according to the physical cell identification ID of each cell managed by the self based on the network identification of the self home network; and distributing time frequency resources for the generated synchronous signals, and sending each synchronous signal on the corresponding time frequency resource.

A transceiver for receiving and transmitting data under the control of the processor.

Optionally, when generating a corresponding synchronization signal for a cell according to a physical cell ID of the cell based on the network identifier of the home network, the processor is configured to:

generating a first Primary Synchronization Signal (PSS) and a first Secondary Synchronization Signal (SSS) of a cell based on a first mapping relation defined by an existing protocol according to a physical cell ID of the cell;

generating at least one group of second PSS and second SSS of a cell based on a set second mapping relation according to a physical cell ID of the cell, wherein the second mapping relation is the same as or different from the first mapping relation, represents the mapping relation between the physical cell group ID and a composition sequence in the physical cell ID, and represents the mapping relation between the physical cell group ID in the physical cell ID and a root index of the composition sequence;

and generating a scrambling sequence based on the network identification of the home network, and scrambling at least one group of second PSS and second SSS by adopting the scrambling sequence.

Optionally, the processor is configured to generate a scrambling sequence based on a network identifier of a home network of the processor, and scramble at least one set of the second PSS and the second SSS by using the scrambling sequence:

generating a scrambling sequence based on the network identification of the home network, and respectively scrambling the first PSS and the first SSS, and each group of the second PSS and the second SSS in sequence according to a set sequence by adopting the scrambling sequence; or,

and generating a scrambling sequence based on the network identification of the self-home network, and respectively and sequentially scrambling each group of the second PSS and the second SSS by adopting the scrambling sequence according to a set sequence.

Optionally, when generating a corresponding synchronization signal for a cell according to a physical cell ID of the cell based on the network identifier of the home network, the processor is configured to:

generating a first PSS and a first SSS of a cell based on a first mapping relation defined by an existing protocol according to a physical cell ID of the cell;

the method comprises the steps of obtaining mapping parameters corresponding to network identification of a home network, obtaining at least one type of corresponding third mapping relation based on the mapping parameters, and generating at least one group of second PSS and second SSS of a cell based on the at least one type of third mapping relation, wherein the second PSS and the second SSS of different groups adopt the same type of third mapping relation or different type of third mapping relation, the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents the mapping relation between an ID in the physical cell group and a root index of the composition sequence in the physical cell ID.

Optionally, when allocating time-frequency resources for the generated synchronization signal, the processor is configured to:

allocating time-frequency resources for the first PSS and the first SSS based on the existing protocol, or allocating newly defined time-frequency resources for the first PSS and the first SS;

allocating time-frequency resources different from the first PSS and the first SSS for at least one group of second PSS and second SSS; or the base station allocates the same time-frequency resources as the first PSS for the second PSS in at least one group of second PSS and second SSS, and allocates time-frequency resources different from the first SSS for the second SSS in at least one group of second PSS and second SSS.

Optionally, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

Optionally, further comprising:

the processor is used for realizing multiplexing of time-frequency resources allocated to the first PSS and the first SSS and time-frequency resources allocated to the at least one group of second PSS and second SSS in a Time Division Multiplexing (TDM) mode or/and Frequency Division Multiplexing (FDM) mode when the time-frequency resources allocated to the at least one group of second PSS and second SSS are different from the time-frequency resources allocated to the first PSS and first SSS;

and the base station is used for allocating the time-frequency resources same as the first PSS for the second PSS in the at least one group of second PSS and second SSS, and realizing multiplexing of the time-frequency resources allocated by the base station for the first SSS and the time-frequency resources allocated for the second SSS in the at least one group of second PSS and second SSS in a TDM way or/and an FDM way when allocating the time-frequency resources different from the first SSS for the second SSS in the at least one group of second PSS and second SSS.

Optionally, a distribution sequence and a time interval between time-frequency resource locations occupied by the second PSS and the second SSS in each group are the same as or different from a distribution sequence and a time interval between time-frequency resource locations occupied by the first PSS and the first SSS.

Optionally, further comprising:

the processor is used for appointing the characteristic information of the synchronous signal with the terminal side in advance, and the characteristic information at least comprises a generation mode of the synchronous signal, a distribution mode of time-frequency resources and a transmission period; or,

before sending the synchronizing signal, the method is used for notifying the terminal side of the characteristic information of the synchronizing signal through a high-level signaling, wherein the characteristic information at least comprises a generating mode of the synchronizing signal, an allocation mode of time-frequency resources and an emission period.

Optionally, the processor is further configured to:

when the synchronization signal is transmitted, the CRS or CSI-RS is carried in the synchronization signal.

The bus architecture may include, among other things, any number of interconnected buses and bridges, with one or more processors, represented by a processor, and various circuits of memory, represented by memory, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver may be a plurality of elements, i.e., including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus architecture and the usual processing, and the memory may store data used by the processor in performing operations.

The transmitting device of the synchronizing signal comprises a processor, a transceiver and a memory, wherein:

a processor for reading the program in the memory, performing the following processes:

receiving a synchronization signal sent by a base station; the base station generates a synchronization signal aiming at a corresponding cell according to a physical cell Identification (ID) of the cell administered by the base station based on a network identification of a home network of the base station; and synchronizing with the corresponding cell according to the received synchronization signal.

A transceiver for receiving and transmitting data under the control of the processor.

Optionally, the synchronization signals received by the processor include a first primary synchronization signal PSS and a first secondary synchronization signal SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by a base station based on a first mapping relation defined by the existing protocol, at least one group of second PSS and second SSS is generated by the base station based on a set second mapping relation, and at least one group of second PSS and second SSS are scrambled by the base station by adopting a scrambling code sequence, wherein the scrambling code sequence is generated by the base station based on the network identification of the home network of the base station; the second mapping relation is the same as or different from the first mapping relation, and represents a mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents a mapping relation between an intra-physical cell group ID and a root index of the composition sequence in the physical cell ID.

Optionally, at least one set of the second PSS and the second SSS is scrambled by the base station using a scrambling sequence, including:

the first PSS and the first SSS, and each group of the second PSS and the second SSS are scrambled by a base station in sequence according to a set sequence by adopting a scrambling code sequence; or,

and each group of the second PSS and the second SSS is scrambled by the base station in sequence according to a set sequence by adopting a scrambling code sequence.

Optionally, the synchronization signal received by the processor includes a first PSS and a first SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by a base station based on a first mapping relation defined by the existing protocol, at least one group of second PSS and second SSS is generated by the base station based on at least one type of third mapping relation corresponding to preset mapping parameters, and the mapping parameters are set corresponding to network identifiers of a home network of the base station; and at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between the physical cell group ID and the composition sequence in the physical cell ID, and represents the mapping relation between the physical cell group ID and the root index of the composition sequence in the physical cell ID.

Optionally, further comprising:

the time frequency resource occupied by the processor for receiving the synchronous signal is distributed by the base station; wherein,

the time-frequency resources occupied by the first PSS and the first SSS are time-frequency resources distributed by the base station based on the existing protocol, or are newly defined by the base station;

the time-frequency resources occupied by the at least one group of the second PSS and the second SSS are different from the time-frequency resources occupied by the first PSS and the first SSS; or the second PSS in the at least one set of second PSS and second SSS occupies the same time-frequency resources as the first PSS, and the second SSS in the at least one set of second PSS and second SSS occupies different time-frequency resources from the first SSS.

Optionally, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

Optionally, when at least one group of the second PSS and the second SSS occupy time-frequency resources different from the first PSS and the first SSS, multiplexing is implemented by using the time-frequency resources occupied by the first PSS and the first SSS and the time-frequency resources occupied by at least one group of the second PSS and the second SSS in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner;

and when the second PSS in the at least one group of second PSS and second SSS occupies time-frequency resources different from the first SSS, the time-frequency resources occupied by the first SSS and the time-frequency resources occupied by the second SSS in the at least one group of second PSS and second SSS realize multiplexing through a TDM mode or/and an FDM mode.

Optionally, a distribution sequence and a time interval between time-frequency resource locations occupied by the second PSS and the second SSS in each group are the same as or different from a distribution sequence and a time interval between time-frequency resource locations occupied by the first PSS and the first SSS.

Optionally, further comprising:

and the processor is used for acquiring a cell-specific pilot signal CRS or a channel state information reference signal CSI-RS from the synchronization signal in the synchronization process, performing RRM measurement based on the CRS or the CSI-RS, and reporting the measurement result to the base station.

The bus architecture may include, among other things, any number of interconnected buses and bridges, with one or more processors, represented by a processor, and various circuits of memory, represented by memory, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver may be a plurality of elements, i.e., including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus architecture and the usual processing, and the memory may store data used by the processor in performing operations.

Drawings

Fig. 1 is a schematic structural diagram of an FDD frame in the background of the invention;

FIG. 2 is a diagram illustrating a TDD frame structure according to the background of the present invention;

FIG. 3 is a schematic diagram of time-frequency positions of FDD synchronization signals in the background art of the present invention;

FIG. 4 is a schematic diagram of the time-frequency position of a TDD synchronization signal in the background art according to the present invention;

FIG. 5 is a flowchart illustrating an overview of synchronization signal transmission according to an embodiment of the present invention;

FIG. 6 is a scrambling diagram of a first synchronization signal according to an embodiment of the present invention;

FIG. 7 is a flowchart illustrating an overview of synchronization signal reception according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a synchronization signal transmitting apparatus according to an embodiment of the present invention;

FIG. 9 is a diagram illustrating a structure of a synchronization signal receiving apparatus according to an embodiment of the present invention;

FIG. 10 is a block diagram of an embodiment of a synchronization signal transmitting entity;

fig. 11 is a schematic structural diagram of a synchronization signal receiving entity apparatus according to an embodiment of the present invention.

Detailed Description

In order to solve the problem of cell measurement confusion in the prior art, the invention provides a method and a device for sending and receiving a synchronization signal, wherein the method comprises the following steps: the base station generates corresponding synchronous signals for each cell respectively according to the physical cell identification ID of each cell managed by the base station on the basis of the network identification of the home network of the base station; and the base station allocates time-frequency resources for the generated synchronous signals and sends each synchronous signal on the corresponding time-frequency resource. The terminal receives the synchronous signal sent by the base station; the base station generates a synchronization signal aiming at a corresponding cell according to a physical cell Identification (ID) of the cell administered by the base station based on a network identification of a home network of the base station; and the terminal synchronizes with the corresponding cell according to the received synchronizing signal.

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

Referring to fig. 5, a specific flow of the transmission of the synchronization signal in the present invention is shown:

step 500: and the base station generates corresponding synchronous signals aiming at each cell respectively according to the physical cell ID of each cell managed by the base station on the basis of the network identification of the home network of the base station.

Step 510: and the base station allocates time-frequency resources for the generated synchronous signals and sends each synchronous signal on the corresponding time-frequency resource.

Specifically, in the embodiment of the present invention, when the base station performs step 500, the following two methods may be adopted to generate the synchronization signal for each cell (only one cell is taken as an example for description below):

the first synchronization signal generation method is (taking cell a as an example): the base station generates a first PSS and a first SSS of the cell a based on a first mapping relationship (i.e., the mapping relationship shown in table 2) defined by an existing protocol according to a physical cell ID of the cell a, and further generates at least one set of a second PSS and a second SSS of the cell a based on a set second mapping relationship according to the physical cell ID of the cell a, and then the base station generates a scrambling code sequence based on a network identifier of a home network of the base station itself, and scrambles at least the set of the second PSS and the second SSS by using the scrambling code sequence.

Wherein the second mapping relationship is the same as or different from the first mapping relationship, and each of them represents a mapping relationship between a physical cell group ID and a component sequence in the physical cell ID (similar to the mapping relationship shown in table 3), and represents a mapping relationship between an intra-physical cell group ID in the physical cell ID and a root index of the component sequence (similar to the mapping relationship shown in table 2).

Specifically, the at least one set of the second PSS and the second SSS generated for the cell a may be the same signal sequence as the first PSS and the first SSS generated for the cell a (i.e., the first mapping relationship is the same as the second mapping relationship), or may be different signal sequences (i.e., the first mapping relationship is different from the second mapping relationship). For the case that the second mapping relationship is different from the first mapping relationship, when the base station generates at least one set of the second PSS and the second SSS for the cell a by using the set second mapping relationship, the following methods (taking the set of the second PSS and the second SSS as an example) may be specifically adopted, but are not limited to:

for the second PSS, Zadoff-Chu sequence generation is still employed, the generation method is the same as the prior art, but a mapping relationship between the intra-physical cell group ID in the physical cell ID and the new root index of the constituent sequence is further agreed using a different root index from the existing one.

For the second SSS, m-sequence generation is still used, the generation method is the same as the prior art, but the mapping relationship between the physical cell group ID in the physical cell ID and the new constituent sequence is further agreed, using a mapping relationship between the physical cell group ID and the constituent sequence different from that in the prior art.

Further, when the base station generates a scrambling sequence based on the network identifier of its home network, and scrambles at least one set of the second PSS and the second SSS using the scrambling sequence, the method specifically includes, but is not limited to, the following two scrambling methods:

the first scrambling mode is as follows: and the base station generates a scrambling sequence based on the network identification of the home network of the base station, and scrambles the first PSS and the first SSS, and each group of the second PSS and the second SSS in sequence according to a set sequence by adopting the scrambling sequence.

The second scrambling mode is as follows: and the base station generates a scrambling sequence based on the network identification of the home network of the base station, and scrambles each group of the second PSS and the second SSS in sequence by adopting the scrambling sequence according to a set sequence.

For example, the base station generates a scrambling sequence based on the network identification of its home network, which may employ the Gold sequence generated by a 31-bit shift register as defined in section 36.2117.2 of the 3GPP protocol. The scrambling sequence is generated by setting the length of output sequence c (n) as M_PNWherein n is 0,1_PN-1, then the scrambling sequence is generated by the formula:

c(n)＝(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)＝(x₁(n+3)+x₁(n))mod2

x₂(n+31)＝(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2

wherein N is_C1600, the scrambling sequence c is represented by x₁And x₂Two sequences constituting x₁(0)＝1,x₁(n) 0, n 1,2, 30, representing the sequence x₁And the scrambling sequence x₂The initial value of (n) is determined by the network identity of the cell's home network. Such as, for example,whereinFor the Network identification, a Network identification of a Public Land Mobile Network (PLMN) is assumed. Wherein, C_initHas a value of x₂The initial value of the sequence.

The base station firstly carries out certain pretreatment on the generated scrambling code sequence, such as reserving all numerical values 1 in the sequence, replacing all numerical values 0 with numerical values-1 to obtain a final scrambling code sequence, and then the scrambling process refers to multiplying the generated final scrambling code sequence by the numerical value bits corresponding to the PSS/SSS sequence.

Further, for the first PSS and the first SSS and at least one set of the second PSS and the second SSS generated as described above, let the number of sets of the second PSS and the second SSS be n, and note that the first PSS and the first SSS are PSS₁And SSS₁N groups of second PSS and second SSS are respectively PSS₂₁And SSS₂₁、PSS₂₂And SSS₂₂、……PSS_2iAnd SSS_2i、……PSS_2NAnd SSS_2N. The relation between the sequence numbers of the second PSS and the second SSS and the time-frequency resources is predefined or notified to the terminal by the base station.

Referring to fig. 6, an example of scrambling for a synchronization signal containing a first PSS and a first SSS and 5 second PSS and second SSS is shown.

When the base station generates a scrambling code sequence based on the network identifier of the home network of the base station and scrambles by using the scrambling code sequence, the following two scrambling modes can be specifically adopted but not limited to:

the first scrambling mode is as follows: scrambling the first PSS and the first SSS with the group of the second PSS and the second SSS according to a set order, where the set order may be a scrambling order determined according to time-frequency resource positions mapped by the first PSS and the first SSS with the n group of the second PSS and the second SSS, for example, scrambling the first PSS and the first SSS with the n group of the second PSS and the second SSS according to an order of increasing frequency domain and then increasing time domain, for example, taking the synchronization signal shown in fig. 6 as an example, the base station scrambles the second PSS and the second SSS according to [ SSS ]₂₁SSS₁SSS₂₂PSS₂₁PSS₁PSS₂₂SSS₂₃SSS₂₄SSS₂₅PSS₂₃PSS₂₄PSS₂₅]The order of scrambling is performed.

The second scrambling mode: the first PSS and the first SSS are not scrambled, and only all the second PSS and the second SSS are scrambled according to a set sequence, where the set sequence may be a scrambling sequence determined according to time-frequency resource locations mapped by the second PSS and the second SSS, for example, n groups of the second PSS and the second SSS are scrambled according to a sequence of increasing frequency domain first and then increasing time domain, for example, taking the synchronization signal shown in fig. 6 as an example, the base station scrambles the SSS₂₁SSS₂₂PSS₂₁PSS₂₂SSS₂₃SSS₂₄SSS₂₅PSS₂₃PSS₂₄PSS₂₅]The order of scrambling is performed.

In addition to the above method for generating a synchronization signal, a second method for generating a synchronization signal for each cell is provided in the embodiments of the present invention.

The second synchronization signal generation method is (still taking cell a as an example): the base station generates a first PSS and a first SSS of the cell A according to a physical cell ID of the cell A and based on a first mapping relation defined by an existing protocol, further, the base station acquires a mapping parameter set corresponding to a network identifier of a home network of the base station, acquires at least one type of corresponding third mapping relation based on the mapping parameter, and generates at least one group of second PSS and second SSS of the cell A based on the acquired at least one type of third mapping relation.

The same type of third mapping relationship or different type of third mapping relationship is used between the second PSS and the second SSS in different groups, and the third mapping relationship is different from the first mapping relationship, but both represents the mapping relationship between the physical cell group ID and the component sequence in the physical cell ID (similar to the mapping relationship shown in table 3), and represents the mapping relationship between the physical cell group ID and the root index of the component sequence in the physical cell ID (similar to the mapping relationship shown in table 2).

Specifically, when the base station generates at least one set of the second PSS and the second SSS of the cell a, the following methods (taking the set of the second PSS and the second SSS as an example) may be specifically adopted, but are not limited to:

firstly, for the second PSS, the Zadoff-Chu sequence is still used for generation, the generation method is the same as the prior art, but the method is different from the prior root index, furthermore, the mapping relationship between the IDs in the physical layer cell ID group and the new root index forming the sequence is agreed, the mapping parameters corresponding to each new root index group (namely, the set new identification information) are agreed, and the mapping relationship between each network identifier and the mapping parameters of the new root index group is established. Here, the network identifier may establish a one-to-one correspondence relationship with the mapping parameters of the new root index group, or may establish a one-to-many relationship.

For the second SSS, the m-sequence generation is still used, the generation method is the same as the prior art, but the mapping relationship between the physical cell group ID and the component sequence in the physical cell ID different from that in the prior art is used, further, the mapping relationship between the physical cell group ID and the new component sequence in the physical cell ID is agreed, the mapping parameters of the new component sequence are agreed, and the mapping relationship between each network identifier and the mapping parameters of the new component sequence is established. Similarly, here, the network identifier may establish a one-to-one correspondence relationship with the mapping parameters of the new component sequence, or may establish a one-to-many relationship. Therefore, the base station can generate the third mapping relation with rich multi-class combinations by adopting the method.

Then, the base station obtains a mapping parameter set corresponding to the network identifier of the home network of the base station, and obtains at least one type of corresponding third mapping relation based on the mapping parameter and the obtained at least one type of third mapping relation.

Table 4 root index and of extended primary synchronization signal PSSCorresponding relationship of

TABLE 5 constituent sequences of extended Secondary synchronization Signal SSS andcorresponding relationship of

In one embodiment, N new root index sets and are defined as shown in Table 4And appointing mapping parameters of N new root index groups, 0-3, and establishing the mapping relation between each network identifier and the mapping parameters of the new root index groups. It should be noted that the correspondence values in table 4 are merely examples, and may not be limited to the correspondence in the following table.

See Table 5 for definitions of N novel component sequences andand appointing mapping parameters of N new composition sequences, 0-3, and establishing the mapping relation between each network identifier and the mapping parameters of the new composition sequences. Also, the correspondence numerical values in table 5 are merely examples and may not be limited to the correspondence in the following table.

For example, the network identifier of the home network of the base station itself is a, the mapping parameter of the new root index group corresponding to the network identifier a is 0, and the mapping parameter of the new component sequence corresponding to the network identifier a is 0, which together form a third mapping relationship, so that at least one set of the second PSS and the second SSS for the cell a is generated by using the root index group whose mapping parameter of the new root index group is 0 and the sequence whose mapping parameter of the new component sequence is 0 (this is a type of third mapping relationship).

For another example, the network identifier of the home network of the base station itself is a, the mapping parameters of the new root index group corresponding to the network identifier a are 0 and 1, and the mapping parameters of the new component sequence corresponding to the network identifier a are 0 and 1, which together form a third mapping relationship, so that at least one set of the second PSS and the second SSS for the cell a is generated by using the root index group whose mapping parameter is 0 or 1 of the new root index group and the sequence whose mapping parameter is 0 and 1 of the new component sequence (this is a second-type third mapping relationship).

Specifically, for example, two groups of the second PSS and the second SSS are generated, the base station generates the first group of the second PSS and the second SSS by using the new root index group with the mapping parameter of 0 and the new composition sequence with the mapping parameter of 0 as the first third mapping relationship, and the base station generates the second group of the second PSS and the second SSS by using the new root index group with the mapping parameter of 2 and the new composition sequence with the mapping parameter of 2 as the second third mapping relationship.

Therefore, each group of the second PSS and the second SSS may be generated by using the same type of third mapping relationship, or may be generated by using different types of third mapping relationships.

For example: the base station uses the root index group with the identifier of 0 and the composition sequence with the mapping parameter of 0 as a third mapping relation, and generates at least one group of second PSS and second SSS for the cell a, and at this time, all the second PSS and the second SSS use the same third mapping relation, which can strengthen the signal strength of the synchronization signal, and is beneficial for the terminal to better receive and analyze the synchronization signal.

For another example, when the number of operators is large, the identity of the operator may be embodied by a combination of heterogeneous third mapping relationships, for example, a root index group with a base station mapping parameter of 0 and a new composition sequence with a mapping parameter of 0 are used as a first type third mapping relationship to generate a first group of a second PSS and a second SSS, the base station generates a second group of the second PSS and a second SSS of the cell a for the second type third mapping relationship by using the root index group with a mapping parameter of 2 and the new composition sequence with a mapping parameter of 2, and the combination relationship of 02 represents the operator a;

similarly, the base station uses the root index group with the mapping parameter of 1 and the new composition sequence with the mapping parameter of 1 as the first kind of third mapping relation to generate the first group of the second PSS and the second SSS, the base station uses the root index group with the mapping parameter of 2 and the new composition sequence with the mapping parameter of 2 as the second kind of third mapping relation to generate the second group of the second PSS and the second SSS, and the combination relation of 12 represents the operator B.

By analogy, the base station may generate the second PSS and the second SSS of different groups using different types of the third mapping relationship, which may enable support for more operators. Preferably, if N sets of the second PSS and the second SSS are adopted and each set adopts different mapping parameters, the above combination can be adopted for 2 pairs^NThe next operator.

Specifically, in the embodiment of the present invention, when the base station performs step 510, the base station allocates time-frequency resources for the generated synchronization signals, and sends each synchronization signal on the corresponding time-frequency resource.

Aiming at a first PSS and a first SSS, a base station allocates time-frequency resources for the first PSS and the first SSS based on the existing protocol, or allocates newly defined time-frequency resources for the first PSS and the first SSS;

specifically, the first PSS and the first SSS are downlink synchronization signals PSS and SSS defined by the 3GPP LTE protocol release 11 and its previous releases. The time-frequency resources occupied by the first PSS and the first SSS may adopt resources specified by the 3GPP LTE protocol release 11 and its previous version, or may be newly defined time-frequency resource locations.

For at least one group of second PSS and second SSS, the base station allocates time-frequency resources which are different from the first PSS and the first SSS for the at least one group of second PSS and second SSS; or the base station allocates the same time-frequency resources as the first PSS for the second PSS in at least one group of second PSS and second SSS, and allocates time-frequency resources different from the first SSS for the second SSS in at least one group of second PSS and second SSS.

Specifically, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

In addition, when the base station allocates Time-Frequency resources different from the first PSS and the first SSS to the at least one set of the second PSS and the second SSS, the base station allocates the Time-Frequency resources to the first PSS and the first SSS, and the Time-Frequency resources allocated to the at least one set of the second PSS and the second SSS, and realizes Multiplexing in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM manner.

For example, for a set of second PSS and second SSS, a TDM manner is adopted for multiplexing time-frequency resources occupied by the second PSS and the second SSS and time-frequency resources occupied by the first PSS and the first SSS, that is, the second PSS and the second SSS occupy the same frequency but occupy different time-domain symbols from the first PSS and the first SSS.

Taking FDD-LTE system as an example, if the time-frequency resources occupied by the first PSS and the first SSS may adopt resources specified by 3GPP LTE protocol release 11 and its previous version, the first PSS and the first SSS may be transmitted in the last two OFDM symbols in subframe 0 and the first slot in subframe 5 of each radio frame, respectively, at this time, the second PSS and the second SSS may be transmitted in other symbols outside the OFDM symbols occupied by the first PSS and the first SSS, for example, in the first two OFDM symbols in subframe 0 and subframe 5 of each radio frame.

For another example, for a set of second PSS and second SSS, the multiplexing mode of the time-frequency resources occupied by the second PSS and second SSS and the time-frequency resources occupied by the first PSS and first SSS employs an FDM mode, that is, the second PSS and second SSS occupy different frequencies from the first PSS and first SSS. Assuming that the first PSS and the first SSS are transmitted on 6 PRBs in the center of the LTE system bandwidth, the second PSS and the second SSS occupy the other PRBs except for the 6 PRBs in the center of the LTE system bandwidth.

Preferably, when a set of second PSS and second SSS has a frequency division multiplexing relationship with the time-frequency resources occupied by the first PSS and first SSS, the center frequencies of the frequency resources occupied by the second PSS and second SSS may be integer multiples of non-100 KHz, for example, the center frequencies of the frequency resources occupied by the second PSS and second SSS are 1.08MHz, 2.16MHz, and the like apart from the center frequency of the system bandwidth. Since the conventional terminal performs cell search at intervals of 100KHz, it is possible to avoid an influence on the conventional cell search when the second PSS and the second SSS use the same constituent sequences as the first PSS and the first SSS.

In addition, it should be noted that the second PSS and the second SSS of different cells may occupy the same time-frequency resource, or may occupy different time-frequency resources. When the second PSS and the second SSS of different cells occupy the same time-frequency resource, multiplexing may be performed in the existing code division manner; when the second PSS and the second SSS of different cells occupy different time-frequency resources, the second PSS and the second SSS of different cells may be multiplexed in the TDM or FDM manner described above.

On the other hand, when the base station allocates the same time-frequency resources as the first PSS for the second PSS in the at least one set of second PSS and second SSS, and allocates the time-frequency resources different from the first SSS for the second SSS in the at least one set of second PSS and second SSS, the base station allocates the time-frequency resources for the first SSS and the time-frequency resources allocated for the second SSS in the at least one set of PSS and second SSS, and multiplexing is realized through a TDM manner or/and an FDM manner. Here, the multiplexing process is similar to that described above, and thus, the description thereof is omitted.

Further, the base station may also configure the distribution sequence and the time interval between the time-frequency resource locations occupied by each group of the second PSS and the second SSS, and specifically, the base station may configure the distribution sequence and the time interval using the same rule as the distribution sequence and the time interval between the time-frequency resource locations occupied by the first PSS and the first SSS, or may configure the distribution sequence and the time interval using a different rule.

Specifically, taking a group of the second PSS and the second SSS as an example, a distribution sequence and a time interval between time-frequency positions occupied by the second PSS and the second SSS may be the same as or different from a distribution sequence and a time interval between time-frequency positions occupied by the first PSS and the first SSS. For example, the second SSS may occupy the OFDM symbol before and the second PSS occupies the OFDM symbol after, or the second PSS may occupy the OFDM symbol before and the second SSS may occupy the OFDM symbol after; alternatively, the symbol interval between the OFDM symbol occupied by the second PSS and the OFDM symbol occupied by the second SSS and the symbol interval between the OFDM symbol occupied by the first PSS and the OFDM symbol occupied by the first SSS may be the same or different.

Optionally, in the second PSS and the second SSS, if a symbol interval between OFDM symbols occupied by the second PSS and OFDM symbols occupied by the second SSS is different from a symbol interval between OFDM symbols occupied by the first PSS and OFDM symbols occupied by the first SSS in the first PSS and the first SSS, the following two optional implementations may be made:

1) if a TDD-LTE system is adopted, in the second PSS and the second SSS, a symbol interval between the OFDM symbol occupied by the second PSS and the OFDM symbol occupied by the second SSS is different from a symbol interval between the OFDM symbol occupied by the first PSS and the OFDM symbol occupied by the first SSS in the first PSS and the first SSS in the existing TDD-LTE system.

If the FDD-LTE system is adopted, in the second PSS and the second SSS, the symbol interval between the OFDM symbol occupied by the second PSS and the OFDM symbol occupied by the second SSS is different from the symbol interval between the OFDM symbol occupied by the first PSS and the OFDM symbol occupied by the first SSS in the existing FDD-LTE system.

2) No matter a TDD-LTE system or an FDD-LTE system is adopted, in the second PSS and the second SSS, the symbol interval between the OFDM symbols occupied by the second PSS and the OFDM symbols occupied by the second SSS is different from the symbol interval between the OFDM symbols occupied by the first PSS and the second SSS in the existing TDD-LTE system or FDD-LTE system.

In addition, the base station may specifically adopt, but is not limited to, the following two ways to enable the terminal side to acquire the characteristic information of the synchronization signal:

first, the base station agrees with the terminal side for the characteristic information of the synchronization signal in advance.

Secondly, before transmitting the synchronization signal, the base station notifies the terminal side of the characteristic information of the synchronization signal through a high-level signaling.

The two modes have the same meaning, and both at least comprise a synchronous signal generation mode, a time-frequency resource allocation mode and an emission period. Here, the higher layer signaling may be Radio Resource Control (RRC) signaling.

When the base station transmits the synchronization Signal, the synchronization Signal carries a Cell-specific pilot Signal (CRS) or a channel state Information Reference Signal (CSI-RS).

Referring to fig. 7, a method for receiving a synchronization signal according to an embodiment of the present invention includes:

step 700: a terminal receives a synchronous signal sent by a base station; the synchronous signal is generated by the base station aiming at the corresponding cell according to the physical cell ID of the cell administered by the base station based on the network identification of the home network of the base station;

step 710: and the terminal synchronizes with the corresponding cell according to the received synchronizing signal.

In the process, the terminal analyzes the physical cell ID of the cell corresponding to the synchronous signal according to the synchronous signal and reports the cell ID to the base station.

The synchronization signal received by the terminal includes, but is not limited to, the following two cases.

The first type of synchronization signal includes a first PSS and a first SSS, and at least one set of a second PSS and a second SSS.

The base stations generate a first mapping relation defined by the existing protocol, at least one group of second PSS and second SSS are generated by the base stations based on a set second mapping relation, and at least one group of second PSS and second SSS are scrambled by the base stations by adopting scrambling sequences, wherein the scrambling sequences are generated by the base stations based on network identifications of self-home networks.

The second mapping relationship here is the same as or different from the first mapping relationship, and indicates a mapping relationship between the physical cell group ID and the constituent sequence in the physical cell ID, and indicates a mapping relationship between the intra-physical cell group ID and the root index of the constituent sequence in the physical cell ID.

In addition, at least one set of the second PSS and the second SSS is scrambled with a scrambling sequence via the base station, including but not limited to the following two ways:

the first scrambling mode is as follows: the first PSS and the first SSS, and the second PSS and the second SSS of each group are scrambled by a base station in sequence according to a set sequence by adopting a scrambling code sequence.

The second scrambling mode is as follows: and each group of the second PSS and the second SSS is scrambled by the base station in sequence according to a set sequence by adopting a scrambling code sequence.

The second type of synchronization signal includes a first PSS and a first SSS, and at least one set of a second PSS and a second SSS.

The first PSS and the first SSS are generated by a base station based on a first mapping relation defined by an existing protocol, at least one group of second PSS and second SSS is generated by the base station based on at least one type of third mapping relation corresponding to preset mapping parameters, and the mapping parameters are set corresponding to network identifications of a home network of the base station.

Here, the same type of third mapping relationship or different type of third mapping relationship is used between the second PSS and the second SSS of different groups, at least one type of third mapping relationship is different from the first mapping relationship, and both represent the mapping relationship between the physical cell group ID and the constituent sequence in the physical cell ID, and represent the mapping relationship between the intra-physical cell group ID and the root index of the constituent sequence in the physical cell ID.

In addition, the time frequency resource occupied by the terminal receiving the synchronization signal is allocated by the base station.

The time-frequency resources occupied by the first PSS and the first SSS are time-frequency resources allocated by the base station based on the existing protocol, or time-frequency resources newly defined by the base station.

The time-frequency resources occupied by the at least one group of the second PSS and the second SSS are different from the time-frequency resources occupied by the first PSS and the first SSS; or the second PSS in the at least one set of second PSS and second SSS occupies the same time-frequency resources as the first PSS, and the second SSS in the at least one set of second PSS and second SSS occupies different time-frequency resources from the first SSS.

The different time-frequency resources are different OFDM symbols and/or different subcarriers.

Further, when at least one group of the second PSS and the second SSS occupy time-frequency resources different from the first PSS and the first SSS, the time-frequency resources occupied by the first PSS and the first SSS and the time-frequency resources occupied by at least one group of the second PSS and the second SSS realize multiplexing in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner.

And when the second PSS in the at least one group of second PSS and second SSS occupies time-frequency resources different from the first SSS, the time-frequency resources occupied by the first SSS and the time-frequency resources occupied by the second SSS in the at least one group of second PSS and second SSS realize multiplexing through a TDM mode or/and an FDM mode.

In addition, the distribution sequence and time interval between the time-frequency resource positions occupied by the second PSS and the second SSS of each group are the same as or different from the distribution sequence and time interval between the time-frequency resource positions occupied by the first PSS and the first SSS.

In addition, the terminal side can acquire the characteristic information of the synchronization signal in, but not limited to, the following two ways:

firstly, the terminal appoints the characteristic information of the synchronizing signal with the base station in advance, and the characteristic information at least comprises the generating mode of the synchronizing signal, the distribution mode of the time frequency resource and the transmitting period.

Secondly, before receiving the synchronization signal, the terminal receives the characteristic information of the synchronization signal notified by the base station through the high-level signaling, wherein the characteristic information at least comprises a generation mode of the synchronization signal, an allocation mode of time-frequency resources and an emission period.

In the synchronization process, the terminal acquires the CRS or the CSI-RS from the synchronization signal, performs RRM measurement based on the CRS or the CSI-RS, and reports the measurement result to the base station.

The RRM measurement herein includes a Reference Signal Received Power (RSRP) and/or a Reference Signal Received Quality (RSRQ) measurement.

When the terminal detects the synchronous signals of a plurality of cells, the terminal determines the physical cell ID of each cell according to the analysis result of the synchronous signals of each cell, and further determines the optimal access cell according to the RRM measurement result of each cell.

Referring to fig. 8, a synchronization signal transmitting apparatus includes:

a generating unit 80, configured to generate, based on the network identifier of the home network, a corresponding synchronization signal for each cell according to the physical cell identifier ID of each cell administered by the generating unit;

a sending unit 81, configured to allocate time-frequency resources for the generated synchronization signals, and send each synchronization signal on the corresponding time-frequency resource.

Optionally, when generating a corresponding synchronization signal for a cell according to a physical cell ID of the cell based on the network identifier of the home network of the cell, the generating unit 80 is configured to:

generating a first Primary Synchronization Signal (PSS) and a first Secondary Synchronization Signal (SSS) of a cell based on a first mapping relation defined by an existing protocol according to a physical cell ID of the cell;

generating at least one group of second PSS and second SSS of a cell based on a set second mapping relation according to a physical cell ID of the cell, wherein the second mapping relation is the same as or different from the first mapping relation, represents the mapping relation between the physical cell group ID and a composition sequence in the physical cell ID, and represents the mapping relation between the physical cell group ID in the physical cell ID and a root index of the composition sequence;

and generating a scrambling sequence based on the network identification of the home network, and scrambling at least one group of second PSS and second SSS by adopting the scrambling sequence.

Optionally, the generating unit 80 is configured to generate a scrambling sequence based on the network identifier of the home network, and when the scrambling sequence is used to scramble at least one set of the second PSS and the second SSS, the scrambling sequence is used to:

generating a scrambling sequence based on the network identification of the home network, and respectively scrambling the first PSS and the first SSS, and each group of the second PSS and the second SSS in sequence according to a set sequence by adopting the scrambling sequence; or,

and generating a scrambling sequence based on the network identification of the self-home network, and respectively and sequentially scrambling each group of the second PSS and the second SSS by adopting the scrambling sequence according to a set sequence.

Optionally, when generating a corresponding synchronization signal for a cell according to a physical cell ID of the cell based on the network identifier of the home network of the cell, the generating unit is configured to:

generating a first PSS and a first SSS of a cell based on a first mapping relation defined by an existing protocol according to a physical cell ID of the cell;

the method comprises the steps of obtaining mapping parameters corresponding to network identification of a home network, obtaining at least one type of corresponding third mapping relation based on the mapping parameters, and generating at least one group of second PSS and second SSS of a cell based on the at least one type of third mapping relation, wherein the second PSS and the second SSS of different groups adopt the same type of third mapping relation or different type of third mapping relation, the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents the mapping relation between an ID in the physical cell group and a root index of the composition sequence in the physical cell ID.

Optionally, when allocating time-frequency resources for the generated synchronization signal, the sending unit 81 is configured to:

allocating time-frequency resources for the first PSS and the first SSS based on the existing protocol, or allocating newly defined time-frequency resources for the first PSS and the first SS;

allocating time-frequency resources different from the first PSS and the first SSS for at least one group of second PSS and second SSS; or the base station allocates the same time-frequency resources as the first PSS for the second PSS in at least one group of second PSS and second SSS, and allocates time-frequency resources different from the first SSS for the second SSS in at least one group of second PSS and second SSS.

Optionally, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

Optionally, further comprising:

a multiplexing unit 82, configured to implement multiplexing in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner, when allocating time-frequency resources different from the first PSS and the first SSS for at least one set of the second PSS and the second SSS, the time-frequency resources allocated for the first PSS and the first SSS, and the time-frequency resources allocated for at least one set of the second PSS and the second SSS;

and the base station is used for allocating the time-frequency resources same as the first PSS for the second PSS in the at least one group of second PSS and second SSS, and realizing multiplexing of the time-frequency resources allocated by the base station for the first SSS and the time-frequency resources allocated for the second SSS in the at least one group of second PSS and second SSS in a TDM way or/and an FDM way when allocating the time-frequency resources different from the first SSS for the second SSS in the at least one group of second PSS and second SSS.

Optionally, a distribution sequence and a time interval between time-frequency resource locations occupied by the second PSS and the second SSS in each group are the same as or different from a distribution sequence and a time interval between time-frequency resource locations occupied by the first PSS and the first SSS.

Optionally, further comprising:

a notification unit 83, configured to agree with a terminal side for feature information of a synchronization signal in advance, where the feature information at least includes a generation mode of the synchronization signal, an allocation mode of a time-frequency resource, and a transmission period; or,

before sending the synchronizing signal, the method is used for notifying the terminal side of the characteristic information of the synchronizing signal through a high-level signaling, wherein the characteristic information at least comprises a generating mode of the synchronizing signal, an allocation mode of time-frequency resources and an emission period.

Optionally, the sending unit 81 is further configured to:

when the synchronization signal is transmitted, the CRS or CSI-RS is carried in the synchronization signal.

Referring to fig. 9, a synchronization signal receiving apparatus includes:

a receiving unit 90, configured to receive a synchronization signal sent by a base station; the base station generates a synchronization signal aiming at a corresponding cell according to a physical cell Identification (ID) of the cell administered by the base station based on a network identification of a home network of the base station;

a synchronization unit 91, configured to synchronize with a corresponding cell according to the received synchronization signal.

Optionally, the synchronization signals received by the receiving unit 90 include a first primary synchronization signal PSS and a first secondary synchronization signal SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by a base station based on a first mapping relation defined by the existing protocol, at least one group of second PSS and second SSS is generated by the base station based on a set second mapping relation, and at least one group of second PSS and second SSS are scrambled by the base station by adopting a scrambling code sequence, wherein the scrambling code sequence is generated by the base station based on the network identification of the home network of the base station; the second mapping relation is the same as or different from the first mapping relation, and represents a mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents a mapping relation between an intra-physical cell group ID and a root index of the composition sequence in the physical cell ID.

Optionally, at least one set of the second PSS and the second SSS is scrambled by the base station using a scrambling sequence, including:

the first PSS and the first SSS, and each group of the second PSS and the second SSS are scrambled by a base station in sequence according to a set sequence by adopting a scrambling code sequence; or,

and each group of the second PSS and the second SSS is scrambled by the base station in sequence according to a set sequence by adopting a scrambling code sequence.

Optionally, the synchronization signal received by the receiving unit 90 includes a first PSS and a first SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by a base station based on a first mapping relation defined by the existing protocol, at least one group of second PSS and second SSS is generated by the base station based on at least one type of third mapping relation corresponding to preset mapping parameters, and the mapping parameters are set corresponding to network identifiers of a home network of the base station; and at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between the physical cell group ID and the composition sequence in the physical cell ID, and represents the mapping relation between the physical cell group ID and the root index of the composition sequence in the physical cell ID.

Optionally, further comprising:

the time frequency resource occupied by the receiving unit 90 for receiving the synchronization signal is allocated by the base station; wherein,

the time-frequency resources occupied by the first PSS and the first SSS are time-frequency resources distributed by the base station based on the existing protocol, or are newly defined by the base station;

the time-frequency resources occupied by the at least one group of the second PSS and the second SSS are different from the time-frequency resources occupied by the first PSS and the first SSS; or the second PSS in the at least one set of second PSS and second SSS occupies the same time-frequency resources as the first PSS, and the second SSS in the at least one set of second PSS and second SSS occupies different time-frequency resources from the first SSS.

Optionally, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

Optionally, when at least one group of the second PSS and the second SSS occupy time-frequency resources different from the first PSS and the first SSS, multiplexing is implemented by using the time-frequency resources occupied by the first PSS and the first SSS and the time-frequency resources occupied by at least one group of the second PSS and the second SSS in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner;

and when the second PSS in the at least one group of second PSS and second SSS occupies time-frequency resources different from the first SSS, the time-frequency resources occupied by the first SSS and the time-frequency resources occupied by the second SSS in the at least one group of second PSS and second SSS realize multiplexing through a TDM mode or/and an FDM mode.

Optionally, a distribution sequence and a time interval between time-frequency resource locations occupied by the second PSS and the second SSS in each group are the same as or different from a distribution sequence and a time interval between time-frequency resource locations occupied by the first PSS and the first SSS.

Optionally, further comprising:

the measurement unit 92 is configured to acquire a cell-specific pilot signal CRS or a channel state information reference signal CSI-RS from a synchronization signal in a synchronization process, perform RRM measurement based on the CRS or the CSI-RS, and report a measurement result to the base station.

Referring to fig. 10, the apparatus for transmitting the synchronization signal includes a processor 1000, a transceiver 1010 and a memory 1020, wherein:

a processor 1000, for reading the program in the memory, executing the following processes:

respectively generating corresponding synchronous signals aiming at each cell according to the physical cell identification ID of each cell managed by the self based on the network identification of the self home network; and distributing time frequency resources for the generated synchronous signals, and sending each synchronous signal on the corresponding time frequency resource.

A transceiver 1010 for receiving and transmitting data under the control of the processor.

Optionally, when generating a corresponding synchronization signal for a cell according to a physical cell ID of the cell based on a network identifier of a home network of the processor 1000, the processor is configured to:

generating a first Primary Synchronization Signal (PSS) and a first Secondary Synchronization Signal (SSS) of a cell based on a first mapping relation defined by an existing protocol according to a physical cell ID of the cell;

generating at least one group of second PSS and second SSS of a cell based on a set second mapping relation according to a physical cell ID of the cell, wherein the second mapping relation is the same as or different from the first mapping relation, represents the mapping relation between the physical cell group ID and a composition sequence in the physical cell ID, and represents the mapping relation between the physical cell group ID in the physical cell ID and a root index of the composition sequence;

and generating a scrambling sequence based on the network identification of the home network, and scrambling at least one group of second PSS and second SSS by adopting the scrambling sequence.

Optionally, the processor 1000 is configured to generate a scrambling sequence based on a network identifier of a home network of the mobile terminal, and scramble at least one set of the second PSS and the second SSS by using the scrambling sequence, where:

generating a scrambling sequence based on the network identification of the home network, and respectively scrambling the first PSS and the first SSS, and each group of the second PSS and the second SSS in sequence according to a set sequence by adopting the scrambling sequence; or,

and generating a scrambling sequence based on the network identification of the self-home network, and respectively and sequentially scrambling each group of the second PSS and the second SSS by adopting the scrambling sequence according to a set sequence.

Optionally, when generating a corresponding synchronization signal for a cell according to a physical cell ID of the cell based on a network identifier of a home network of the processor 1000, the processor is configured to:

generating a first PSS and a first SSS of a cell based on a first mapping relation defined by an existing protocol according to a physical cell ID of the cell;

the method comprises the steps of obtaining mapping parameters corresponding to network identification of a home network, obtaining at least one type of corresponding third mapping relation based on the mapping parameters, and generating at least one group of second PSS and second SSS of a cell based on the at least one type of third mapping relation, wherein the second PSS and the second SSS of different groups adopt the same type of third mapping relation or different type of third mapping relation, the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents the mapping relation between an ID in the physical cell group and a root index of the composition sequence in the physical cell ID.

Optionally, when allocating time-frequency resources for the generated synchronization signal, the processor 1000 is configured to:

allocating time-frequency resources for the first PSS and the first SSS based on the existing protocol, or allocating newly defined time-frequency resources for the first PSS and the first SS;

allocating time-frequency resources different from the first PSS and the first SSS for at least one group of second PSS and second SSS; or the base station allocates the same time-frequency resources as the first PSS for the second PSS in at least one group of second PSS and second SSS, and allocates time-frequency resources different from the first SSS for the second SSS in at least one group of second PSS and second SSS.

Optionally, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

Optionally, further comprising:

a processor 1000, configured to implement multiplexing in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner, when allocating time-frequency resources different from those of a first PSS and a first SSS for at least one set of a second PSS and a second SSS, the time-frequency resources allocated for the first PSS and the first SSS, and the time-frequency resources allocated for at least one set of the second PSS and the second SSS;

and the base station is used for allocating the time-frequency resources same as the first PSS for the second PSS in the at least one group of second PSS and second SSS, and realizing multiplexing of the time-frequency resources allocated by the base station for the first SSS and the time-frequency resources allocated for the second SSS in the at least one group of second PSS and second SSS in a TDM way or/and an FDM way when allocating the time-frequency resources different from the first SSS for the second SSS in the at least one group of second PSS and second SSS.

Optionally, a distribution sequence and a time interval between time-frequency resource locations occupied by the second PSS and the second SSS in each group are the same as or different from a distribution sequence and a time interval between time-frequency resource locations occupied by the first PSS and the first SSS.

Optionally, further comprising:

the processor 1000 is configured to agree with a terminal side for feature information of a synchronization signal in advance, where the feature information at least includes a generation mode of the synchronization signal, an allocation mode of a time-frequency resource, and a transmission period; or,

before sending the synchronizing signal, the method is used for notifying the terminal side of the characteristic information of the synchronizing signal through a high-level signaling, wherein the characteristic information at least comprises a generating mode of the synchronizing signal, an allocation mode of time-frequency resources and an emission period.

Optionally, the processor 1000 is further configured to:

when the synchronization signal is transmitted, the CRS or CSI-RS is carried in the synchronization signal.

The bus architecture may include, among other things, any number of interconnected buses and bridges, with one or more processors, represented by a processor, and various circuits of memory, represented by memory, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver may be a plurality of elements, i.e., including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus architecture and the usual processing, and the memory may store data used by the processor in performing operations.

Referring to fig. 11, the apparatus for transmitting the synchronization signal includes a processor 1100, a transceiver 1110, and a memory 1120, wherein:

a processor 1100 for reading the program in the memory, performing the following processes:

receiving a synchronization signal sent by a base station; the base station generates a synchronization signal aiming at a corresponding cell according to a physical cell Identification (ID) of the cell administered by the base station based on a network identification of a home network of the base station; and synchronizing with the corresponding cell according to the received synchronization signal.

A transceiver 1110 for receiving and transmitting data under the control of the processor.

Optionally, the synchronization signals received by the processor 1100 include a first primary synchronization signal PSS and a first secondary synchronization signal SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by a base station based on a first mapping relation defined by the existing protocol, at least one group of second PSS and second SSS is generated by the base station based on a set second mapping relation, and at least one group of second PSS and second SSS are scrambled by the base station by adopting a scrambling code sequence, wherein the scrambling code sequence is generated by the base station based on the network identification of the home network of the base station; the second mapping relation is the same as or different from the first mapping relation, and represents a mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents a mapping relation between an intra-physical cell group ID and a root index of the composition sequence in the physical cell ID.

Optionally, at least one set of the second PSS and the second SSS is scrambled by the base station using a scrambling sequence, including:

the first PSS and the first SSS, and each group of the second PSS and the second SSS are scrambled by a base station in sequence according to a set sequence by adopting a scrambling code sequence; or,

and each group of the second PSS and the second SSS is scrambled by the base station in sequence according to a set sequence by adopting a scrambling code sequence.

Optionally, the synchronization signal received by the processor 1100 includes a first PSS and a first SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by a base station based on a first mapping relation defined by the existing protocol, at least one group of second PSS and second SSS is generated by the base station based on at least one type of third mapping relation corresponding to preset mapping parameters, and the mapping parameters are set corresponding to network identifiers of a home network of the base station; and at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between the physical cell group ID and the composition sequence in the physical cell ID, and represents the mapping relation between the physical cell group ID and the root index of the composition sequence in the physical cell ID.

Optionally, further comprising:

the time frequency resources occupied by the processor 1100 for receiving the synchronization signals are allocated by the base station; wherein,

the time-frequency resources occupied by the first PSS and the first SSS are time-frequency resources distributed by the base station based on the existing protocol, or are newly defined by the base station;

the time-frequency resources occupied by the at least one group of the second PSS and the second SSS are different from the time-frequency resources occupied by the first PSS and the first SSS; or the second PSS in the at least one set of second PSS and second SSS occupies the same time-frequency resources as the first PSS, and the second SSS in the at least one set of second PSS and second SSS occupies different time-frequency resources from the first SSS.

Optionally, the different time-frequency resources are different OFDM symbols and/or different subcarriers.

Optionally, when at least one group of the second PSS and the second SSS occupy time-frequency resources different from the first PSS and the first SSS, multiplexing is implemented by using the time-frequency resources occupied by the first PSS and the first SSS and the time-frequency resources occupied by at least one group of the second PSS and the second SSS in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner;

and when the second PSS in the at least one group of second PSS and second SSS occupies time-frequency resources different from the first SSS, the time-frequency resources occupied by the first SSS and the time-frequency resources occupied by the second SSS in the at least one group of second PSS and second SSS realize multiplexing through a TDM mode or/and an FDM mode.

Optionally, a distribution sequence and a time interval between time-frequency resource locations occupied by the second PSS and the second SSS in each group are the same as or different from a distribution sequence and a time interval between time-frequency resource locations occupied by the first PSS and the first SSS.

Optionally, further comprising:

the processor 1100 is configured to, in a synchronization process, acquire a cell-specific pilot signal CRS or a channel state information reference signal CSI-RS from a synchronization signal, perform RRM measurement based on the CRS or the CSI-RS, and report a measurement result to a base station.

The bus architecture may include, among other things, any number of interconnected buses and bridges, with one or more processors, represented by a processor, and various circuits of memory, represented by memory, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver may be a plurality of elements, i.e., including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus architecture and the usual processing, and the memory may store data used by the processor in performing operations.

In summary, in the embodiments of the present invention, a method and an apparatus for sending and receiving a synchronization signal are adopted, where a base station generates, based on a network identifier of a home network of the base station, a corresponding synchronization signal for each cell according to a physical cell identifier ID of each cell administered by the base station; and the base station allocates time-frequency resources for the generated synchronous signals and sends each synchronous signal on the corresponding time-frequency resource. The terminal receives the synchronous signal sent by the base station; the base station generates a synchronization signal aiming at a corresponding cell according to a physical cell Identification (ID) of the cell administered by the base station based on a network identification of a home network of the base station; the terminal synchronizes with the corresponding cell according to the received synchronization signal, and the problem of cell measurement confusion in the prior art is solved.

Since the synchronization signal is related not only to the cell ID but also to the network identity. Therefore, when the method is applied to the unauthorized frequency band, even if a plurality of operators are deployed nearby with the same frequency, the synchronous signals of the operators are different, so that the problem of confusion when the terminal measures the synchronous signals is avoided. In addition, the first PSS and the first SSS and at least one group of second PSS and second SSS are adopted simultaneously, so that the detection performance and RRM measurement performance of the terminal on the cell can be improved.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

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

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

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

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

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

Claims (38)

1. A method for transmitting a synchronization signal, comprising:

the base station generates corresponding synchronous signals aiming at each cell according to the physical cell identification ID of each cell managed by the base station on the basis of the network identification of the home network of the base station;

and the base station allocates time-frequency resources for the generated synchronous signals and sends each synchronous signal on the corresponding time-frequency resource.

2. The method of claim 1, wherein the base station generates a corresponding synchronization signal for one cell according to a physical cell ID of the one cell based on a network identification of its own home network, comprising:

a base station generates a first Primary Synchronization Signal (PSS) and a first Secondary Synchronization Signal (SSS) of the cell based on a first mapping relation defined by an existing protocol according to a physical cell ID of the cell;

a base station generates at least one group of second PSS and second SSS of one cell based on a set second mapping relation according to a physical cell ID of the cell, wherein the second mapping relation is the same as or different from the first mapping relation, represents a mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents a mapping relation between an intra-physical cell group ID in the physical cell ID and a root index of the composition sequence;

and the base station generates a scrambling code sequence based on the network identification of the home network of the base station, and scrambles at least the group of second PSS and second SSS by adopting the scrambling code sequence.

3. The method of claim 2, wherein a base station generates a scrambling sequence based on a network identification of its home network and scrambles at least the at least one set of the second PSS and the second SSS with the scrambling sequence, comprising:

the base station generates a scrambling sequence based on the network identification of the home network of the base station, and scrambles the first PSS and the first SSS, and each group of second PSS and second SSS in sequence according to a set sequence by adopting the scrambling sequence; or,

and the base station generates a scrambling sequence based on the network identification of the home network of the base station, and scrambles each group of the second PSS and the second SSS in sequence according to a set sequence by adopting the scrambling sequence.

4. The method of claim 1, wherein the base station generates a corresponding synchronization signal for one cell according to a physical cell ID of the one cell based on a network identification of its own home network, comprising:

a base station generates a first PSS and a first SSS of the cell based on the first mapping relation defined by the existing protocol according to the physical cell ID of the cell;

the base station acquires mapping parameters set corresponding to a network identifier of a self home network, acquires at least one corresponding type of third mapping relation based on the mapping parameters, and generates at least one group of second PSS and second SSS of the cell based on the at least one type of third mapping relation, wherein the same type of third mapping relation or different type of third mapping relation is adopted between the second PSS and the second SSS of different groups, the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents the mapping relation between a physical cell group ID in the physical cell ID and a root index of the composition sequence.

5. The method of claim 2, 3 or 4, wherein the base station allocates time-frequency resources for the generated synchronization signals, comprising:

the base station allocates time-frequency resources for the first PSS and the first SSS based on the existing protocol, or allocates newly defined time-frequency resources for the first PSS and the first SSS;

the base station allocates time-frequency resources different from the first PSS and the first SSS for the at least one group of second PSS and second SSS; or the base station allocates the same time-frequency resources as the first PSS for a second PSS in the at least one group of second PSS and second SSS, and allocates time-frequency resources different from the first SSS for a second SSS in the at least one group of second PSS and second SSS.

6. The method of claim 5, wherein the different time-frequency resources are different Orthogonal Frequency Division Multiplexing (OFDM) symbols and/or different subcarriers.

7. The method of claim 5 or 6, wherein when a base station allocates time-frequency resources for the at least one set of second PSS and second SSS different from the first PSS and first SSS, the time-frequency resources allocated by the base station for the first PSS and first SSS and the time-frequency resources allocated for the at least one set of second PSS and second SSS are multiplexed by a Time Division Multiplexing (TDM) method or/and a Frequency Division Multiplexing (FDM) method;

and when the base station allocates the time-frequency resources which are the same as the first PSS for the second PSS in the at least one group of second PSS and second SSS and the time-frequency resources which are different from the first SSS for the second SSS in the at least one group of second PSS and second SSS, the base station allocates the time-frequency resources for the first SSS and the time-frequency resources for the second SSS in the at least one group of second PSS and second SSS to realize multiplexing in a TDM mode or/and an FDM mode.

8. The method of claim 5, wherein an order of distribution and time intervals between time-frequency resource locations occupied by each set of second PSS and second SSS is the same or different from an order of distribution and time intervals between time-frequency resource locations occupied by the first PSS and first SSS.

9. The method of any one of claims 1-8, further comprising:

the base station appoints the characteristic information of the synchronizing signal with the terminal side in advance, wherein the characteristic information at least comprises the generation mode of the synchronizing signal, the distribution mode of time-frequency resources and the transmission period; or,

before sending the synchronous signal, the base station informs the terminal side of the characteristic information of the synchronous signal through a high-level signaling, wherein the characteristic information at least comprises a generation mode of the synchronous signal, an allocation mode of time-frequency resources and an emission period.

10. The method according to any of claims 1-9, wherein a base station carries a cell-specific pilot signal, CRS, or a channel state information reference signal, CSI-RS, in a synchronization signal when transmitting the synchronization signal.

11. A method for receiving a synchronization signal, comprising:

a terminal receives a synchronous signal sent by a base station; the base station generates a synchronization signal aiming at a corresponding cell according to a physical cell Identification (ID) of the cell administered by the base station based on a network identification of a home network of the base station;

and the terminal synchronizes with the corresponding cell according to the received synchronizing signal.

12. The method of claim 11, wherein the synchronization signals received by the terminal comprise a first primary synchronization signal, PSS, and a first secondary synchronization signal, SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by the base station based on a first mapping relation defined by an existing protocol, the at least one set of second PSS and second SSS is generated by the base station based on a set second mapping relation, and the at least one set of second PSS and second SSS is scrambled by the base station by adopting a scrambling sequence, wherein the scrambling sequence is generated by the base station based on a network identification of a home network of the base station; wherein the second mapping relation is the same as or different from the first mapping relation, and represents a mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents a mapping relation between an intra-physical cell group ID and a root index of the composition sequence in the physical cell ID.

13. The method of claim 12, wherein at least the at least one set of the second PSS and the second SSS are scrambled with a scrambling sequence via the base station, comprising:

the first PSS and the first SSS, and each group of the second PSS and the second SSS are scrambled by the base station in sequence according to a set sequence by adopting the scrambling code sequence; or,

and each group of the second PSS and the second SSS is scrambled by the base station in sequence according to a set sequence by adopting the scrambling code sequence.

14. The method of claim 11, wherein a terminal receives synchronization signals comprising a first PSS and a first SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by a base station based on a first mapping relation defined by an existing protocol, the at least one group of second PSS and second SSS is generated by the base station based on at least one type of third mapping relation corresponding to preset mapping parameters, and the mapping parameters are set corresponding to network identifiers of a home network of the base station; and the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between the physical cell group ID and the composition sequence in the physical cell ID, and represents the mapping relation between the physical cell group ID and the root index of the composition sequence in the physical cell ID.

15. The method of claim 12, 13 or 14, further comprising:

the time frequency resource occupied by the terminal receiving the synchronous signal is distributed by the base station; wherein,

the time-frequency resources occupied by the first PSS and the first SSS are time-frequency resources allocated by the base station based on the existing protocol, or time-frequency resources newly defined by the base station;

the time-frequency resources occupied by the at least one group of second PSS and second SSS are different from the time-frequency resources occupied by the first PSS and first SSS; or the second PSS in the at least one set of second PSS and second SSS occupies the same time-frequency resources as the first PSS, and the second SSS in the at least one set of second PSS and second SSS occupies different time-frequency resources from the first SSS.

16. The method of claim 15, wherein the different time-frequency resources are different Orthogonal Frequency Division Multiplexing (OFDM) symbols and/or different subcarriers.

17. The method according to claim 15 or 16, wherein when the at least one set of second PSS and second SSS occupy different time-frequency resources from the first PSS and first SSS, the time-frequency resources occupied by the first PSS and first SSS and the time-frequency resources occupied by the at least one set of second PSS and second SSS are multiplexed by a time division multiplexing, TDM, manner or/and a frequency division multiplexing, FDM, manner;

and when the second PSS in the at least one group of second PSS and second SSS occupies time-frequency resources different from the first SSS, multiplexing is realized by a TDM mode or/and an FDM mode through the time-frequency resources occupied by the first SSS and the time-frequency resources occupied by the second SSS in the at least one group of second PSS and second SSS.

18. The method of claim 15, wherein an order of distribution and time intervals between time-frequency resource locations occupied by each set of second PSS and second SSS is the same or different from an order of distribution and time intervals between time-frequency resource locations occupied by the first PSS and first SSS.

19. The method of any one of claims 11-18, further comprising:

in the synchronization process, the terminal acquires a cell-specific pilot signal CRS or a channel state information reference signal CSI-RS from the synchronization signal, performs RRM measurement based on the CRS or the CSI-RS, and reports the measurement result to the base station.

20. A synchronization signal transmission device, comprising:

a generating unit, configured to generate, based on a network identifier of a home network of the mobile terminal, a corresponding synchronization signal for each cell according to a physical cell identifier ID of each cell administered by the mobile terminal;

and the sending unit is used for distributing time-frequency resources for the generated synchronous signals and sending each synchronous signal on the corresponding time-frequency resource.

21. The apparatus of claim 20, wherein when generating the corresponding synchronization signal for one cell according to a physical cell ID of the one cell based on a network identifier of a home network of the apparatus, the generating unit is configured to:

generating a first Primary Synchronization Signal (PSS) and a first Secondary Synchronization Signal (SSS) of the cell based on a first mapping relation defined by an existing protocol according to a physical cell ID of the cell;

generating at least one set of a second PSS and a second SSS of the cell based on a set second mapping relation according to the physical cell ID of the cell, wherein the second mapping relation is the same as or different from the first mapping relation, and represents the mapping relation between the physical cell group ID and the composition sequence in the physical cell ID and the mapping relation between the intra-physical cell group ID in the physical cell ID and the root index of the composition sequence;

and generating a scrambling code sequence based on the network identification of the home network of the user, and scrambling at least the group of the second PSS and the second SSS by adopting the scrambling code sequence.

22. The apparatus of claim 21, wherein the means for generating is configured to, when generating a scrambling sequence based on a network identification of an own home network and employing the scrambling sequence to scramble at least the at least one set of second PSS and second SSS:

generating a scrambling sequence based on a network identifier of a self-owned network, and scrambling the first PSS and the first SSS, and each group of the second PSS and the second SSS in sequence according to a set sequence by adopting the scrambling sequence; or,

and generating a scrambling sequence based on the network identification of the home network, and respectively scrambling each group of the second PSS and the second SSS in sequence according to a set sequence by adopting the scrambling sequence.

23. The apparatus of claim 20, wherein when generating the corresponding synchronization signal for one cell according to a physical cell ID of the one cell based on a network identifier of a home network of the apparatus, the generating unit is configured to:

generating a first PSS and a first SSS of the cell based on the first mapping relation defined by the existing protocol according to the physical cell ID of the cell;

the method comprises the steps of obtaining mapping parameters corresponding to network identification of a home network of the cell, obtaining at least one corresponding type of third mapping relation based on the mapping parameters, and generating at least one group of second PSS and second SSS of the cell based on the at least one type of third mapping relation, wherein the same type of third mapping relation or different type of third mapping relation is adopted between the second PSS and the second SSS of different groups, the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents the mapping relation between a physical cell group ID in the physical cell ID and a root index of the composition sequence.

24. The apparatus of claim 21, 22 or 23, wherein when allocating time-frequency resources for the generated synchronization signal, the transmitting unit is configured to:

allocating time-frequency resources to the first PSS and the first SSS based on an existing protocol, or allocating newly defined time-frequency resources to the first PSS and the first SS;

allocating time-frequency resources, different from the first PSS and first SSS, for the at least one set of second PSS and second SSS; or the base station allocates the same time-frequency resources as the first PSS for a second PSS in the at least one group of second PSS and second SSS, and allocates time-frequency resources different from the first SSS for a second SSS in the at least one group of second PSS and second SSS.

25. The apparatus of claim 24, wherein the different time-frequency resources are different Orthogonal Frequency Division Multiplexing (OFDM) symbols and/or different subcarriers.

26. The apparatus of claim 24 or 25, further comprising:

a multiplexing unit, configured to implement multiplexing in a Time Division Multiplexing (TDM) manner or/and a Frequency Division Multiplexing (FDM) manner, when allocating time-frequency resources different from the first PSS and the first SSS for the at least one set of second PSS and the second SSS, the time-frequency resources allocated for the first PSS and the first SSS, and the time-frequency resources allocated for the at least one set of second PSS and the second SSS;

and the base station is configured to allocate, to a second PSS in the at least one set of second PSS and second SSS, time-frequency resources that are the same as the first PSS, and allocate, to a second SSS in the at least one set of second PSS and second SSS, time-frequency resources that are different from the first SSS, and the time-frequency resources allocated by the base station to the first SSS and the time-frequency resources allocated to the second SSS in the at least one set of second PSS and second SSS implement multiplexing in a TDM manner or/and an FDM manner.

27. The apparatus of claim 24, wherein an order of distribution and time intervals between time-frequency resource locations occupied by each set of second PSS and second SSS is the same as or different from an order of distribution and time intervals between time-frequency resource locations occupied by the first PSS and first SSS.

28. The apparatus of any one of claims 20-27, further comprising:

the notification unit is used for appointing the characteristic information of the synchronous signal with a terminal side in advance, and the characteristic information at least comprises a generation mode of the synchronous signal, a distribution mode of time-frequency resources and a transmission period; or,

before sending the synchronization signal, the method is used for notifying the terminal side of the characteristic information of the synchronization signal through a high-level signaling, wherein the characteristic information at least comprises a generation mode of the synchronization signal, an allocation mode of time-frequency resources and an emission period.

29. The apparatus of any one of claims 20-28, wherein the sending unit is further to:

when a synchronization signal is transmitted, the synchronization signal carries a CRS or a CSI-RS.

30. An apparatus for receiving a synchronization signal, comprising:

a receiving unit, configured to receive a synchronization signal sent by a base station; the base station generates a synchronization signal aiming at a corresponding cell according to a physical cell Identification (ID) of the cell administered by the base station based on a network identification of a home network of the base station;

and the synchronization unit is used for synchronizing with the corresponding cell according to the received synchronization signal.

31. The apparatus of claim 30, wherein the synchronization signals received by the receiving unit comprise a first Primary Synchronization Signal (PSS) and a first Secondary Synchronization Signal (SSS), and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by the base station based on a first mapping relation defined by an existing protocol, the at least one set of second PSS and second SSS is generated by the base station based on a set second mapping relation, and the at least one set of second PSS and second SSS is scrambled by the base station by adopting a scrambling sequence, wherein the scrambling sequence is generated by the base station based on a network identification of a home network of the base station; wherein the second mapping relation is the same as or different from the first mapping relation, and represents a mapping relation between a physical cell group ID and a composition sequence in the physical cell ID, and represents a mapping relation between an intra-physical cell group ID and a root index of the composition sequence in the physical cell ID.

32. The apparatus of claim 31, wherein at least the at least one set of the second PSS and the second SSS are scrambled with a scrambling sequence via the base station, comprising:

the first PSS and the first SSS, and each group of the second PSS and the second SSS are scrambled by the base station in sequence according to a set sequence by adopting the scrambling code sequence; or,

and each group of the second PSS and the second SSS is scrambled by the base station in sequence according to a set sequence by adopting the scrambling code sequence.

33. The apparatus of claim 30, wherein synchronization signals received by the receiving unit comprise a first PSS and a first SSS, and at least one set of a second PSS and a second SSS; wherein,

the first PSS and the first SSS are generated by a base station based on a first mapping relation defined by an existing protocol, the at least one group of second PSS and second SSS is generated by the base station based on at least one type of third mapping relation corresponding to preset mapping parameters, and the mapping parameters are set corresponding to network identifiers of a home network of the base station; and the at least one type of third mapping relation is different from the first mapping relation, represents the mapping relation between the physical cell group ID and the composition sequence in the physical cell ID, and represents the mapping relation between the physical cell group ID and the root index of the composition sequence in the physical cell ID.

34. The apparatus of claim 31, 32 or 33, further comprising:

the time frequency resource occupied by the receiving unit for receiving the synchronous signal is distributed by the base station; wherein,

the time-frequency resources occupied by the first PSS and the first SSS are time-frequency resources allocated by the base station based on the existing protocol, or time-frequency resources newly defined by the base station;

the time-frequency resources occupied by the at least one group of second PSS and second SSS are different from the time-frequency resources occupied by the first PSS and first SSS; or the second PSS in the at least one set of second PSS and second SSS occupies the same time-frequency resources as the first PSS, and the second SSS in the at least one set of second PSS and second SSS occupies different time-frequency resources from the first SSS.

35. The apparatus of claim 34, wherein the different time-frequency resources are different Orthogonal Frequency Division Multiplexing (OFDM) symbols and/or different subcarriers.

36. The apparatus of claim 34 or 35, wherein when the at least one set of second PSS and second SSS occupy different time-frequency resources from the first PSS and first SSS, the time-frequency resources occupied by the first PSS and first SSS and the time-frequency resources occupied by the at least one set of second PSS and second SSS are multiplexed by a time division multiplexing, TDM, or/and frequency division multiplexing, FDM, manner;

and when the second PSS in the at least one group of second PSS and second SSS occupies time-frequency resources different from the first SSS, multiplexing is realized by a TDM mode or/and an FDM mode through the time-frequency resources occupied by the first SSS and the time-frequency resources occupied by the second SSS in the at least one group of second PSS and second SSS.

37. The apparatus of claim 34, wherein an order of distribution and time intervals between time-frequency resource locations occupied by each set of second PSS and second SSS is the same as or different from an order of distribution and time intervals between time-frequency resource locations occupied by the first PSS and first SSS.

38. The apparatus of any one of claims 30-37, further comprising:

and the measurement unit is used for acquiring a cell-specific pilot signal CRS or a channel state information reference signal CSI-RS from the synchronization signal in the synchronization process, performing RRM measurement based on the CRS or the CSI-RS, and reporting the measurement result to the base station.