CN106358269B

CN106358269B - Cell search method and device for narrowband auxiliary broadband

Info

Publication number: CN106358269B
Application number: CN201610877716.9A
Authority: CN
Inventors: 洪晨; 鲁志兵; 陈宏�; 王志国; 汪嘉文
Original assignee: Hytera Communications Corp Ltd
Current assignee: Hytera Communications Corp Ltd
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2021-01-19
Anticipated expiration: 2036-09-30
Also published as: CN106358269A

Abstract

The application provides a cell search method and a cell search device for a narrowband auxiliary broadband, wherein the method comprises the following steps: a terminal receives a broadcast message sent by a narrow-band system, wherein the broadcast message carries cell information of a broadband system in the coverage of the narrow-band system; and the terminal searches the cell of the broadband system according to the cell information of the broadband system. The narrow-band system sends the broadcast message carrying the cell information of the broadband system in the coverage area to assist the terminal to know the cell information of the broadband system, and then the cell search of the broadband system is carried out in a targeted manner, so that the scanning range can be reduced, the calculation amount is reduced, and the cell search speed is improved.

Description

Cell search method and device for narrowband auxiliary broadband

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for cell search of a narrowband auxiliary wideband.

Background

Currently, in a broadband system LTE (Long Term Evolution), a UE (user equipment) needs to perform cell search, cell system information acquisition, random access, and other processes to access the LTE. Among them, the main purpose of cell search is: 1. acquiring frequency and symbol synchronization with a cell; 2, acquiring the initial position of a system frame; 3. a cell identity is determined.

The UE not only needs to perform cell search when starting up, but also continuously searches for a neighbor cell to obtain synchronization and estimate the reception quality of the cell signal in order to support mobility, thereby determining whether to perform handover.

CELL identity (CELL ID) in LTE system defines 504 possible values, from 0 to 503; the 504 CELL IDs were divided into 168 groups of 3.

Wherein the content of the first and second substances,

is the CELL ID, and the CELL ID,

the group number of the packet is represented by 168 values, from 0 to 167.

The number in the group is represented, and 3 values are provided, from 0 to 2.

To support cell search, LTE defines Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS). Wherein PSS is root index u and

associated Zadoff _ Chu sequences, each

Corresponding to a value of u; SSS is

There are related interleaved m-sequences. And the UE receives PSS and SSS signals of the broadband system for synchronization, and can determine the cell identifier of the current physical layer to complete cell search.

When the UE carries out cell search, frequency sweeping is carried out in a working frequency band supported by the UE, the PSS is subjected to blind detection on different frequency points, sliding correlation is carried out by utilizing a local PSS signal and a scanned signal, correlation processing is carried out by utilizing a local SSS signal and the scanned signal, and a group number is determined

And intra-group numbering

To calculate the cell identity to be synchronized.

However, the working frequency range supported by the terminal is wide, and frequency points to be swept are more, so that the problems of large blind detection range, large calculation amount and long time are caused. In addition, the PSS sequences and the SSSs used by the terminal have 3 and 168 sequences, and the computation amount of the correlation processing is very large, which further aggravates the problem of large computation amount and long time for cell search.

Disclosure of Invention

The method and the device realize the cell search of a broadband system through a narrowband system auxiliary terminal, send a broadcast message carrying cell information of the broadband system by the narrowband system, and realize the cell search by the terminal directly according to the cell information of the broadband system. The terminal can narrow the blind detection range and reduce the calculation amount depending on the cell information of the broadband system, thereby accelerating the cell search process.

A first aspect of the present application provides a method for cell search of a narrowband assisted wideband, including:

a terminal receives a broadcast message sent by a narrow-band system, wherein the broadcast message carries cell information of a broadband system in the coverage of the narrow-band system; and the terminal searches the cell of the broadband system according to the cell information of the broadband system.

Optionally, the cell information of the broadband system includes: indexing the working frequency band;

the terminal carries out the cell search of the broadband system according to the cell information of the broadband system, and the cell search comprises the following steps:

the terminal scans signals in the working frequency band of the broadband system according to the working frequency band index of the broadband system;

the terminal generates a local main synchronizing signal and a local auxiliary synchronizing signal according to a synchronizing signal generating mode specified by a broadband system protocol;

the terminal uses the local main synchronous signal and the local auxiliary synchronous signal to carry out relative processing with the scanned signal to obtain the frame starting position of the broadband system and the cell identification to be synchronized.

Optionally, the cell information of the broadband system includes: a cell identity;

the terminal scans signals in a frequency band supported by the terminal;

the terminal generates a local main synchronizing signal and a local auxiliary synchronizing signal according to the cell identifier of the broadband system;

and the terminal performs related processing on the local synchronizing signal and the local auxiliary synchronizing signal with the scanned signal to obtain a frame starting position of the broadband system and a cell identifier to be synchronized.

Optionally, the cell information of the broadband system includes: an operating frequency band index and a cell identifier;

and the terminal performs related processing on the local main synchronizing signal and the local auxiliary synchronizing signal and the scanned signals to obtain a frame starting position of the broadband system and a cell identifier to be synchronized.

Optionally, the generating, by the terminal, a local primary synchronization signal and a local secondary synchronization signal according to the cell identifier of the broadband system includes:

the terminal determines a root index of a main synchronization signal according to the cell identification of the broadband system, and generates a local main synchronization signal according to the root index;

and the terminal determines the group serial number of the physical layer cell according to the cell identification of the broadband system and generates a local auxiliary synchronization signal according to the group signal.

Optionally, the cell information of the broadband system includes: the cell identification and the position of the broadband base station to which the cell identified by the cell identification belongs;

the terminal calculates the distance between the broadband base station and the terminal, selects N broadband base stations close to the terminal according to the distance relation, and determines the cell identification corresponding to the selected broadband base stations; the value of N is a positive integer greater than or equal to 1;

the terminal scans signals in a frequency band supported by the terminal;

the terminal generates a local primary synchronization signal and a local secondary synchronization signal according to the determined cell identifier;

Optionally, the performing, by the terminal, a correlation process on the local primary synchronization signal and the local secondary synchronization signal with the scanned signal to obtain a frame start position of the broadband system and a cell identifier to be synchronized includes:

the terminal performs sliding correlation processing by using the local main synchronization signal and the scanned signal, and determines a frame timing position and a corresponding in-group serial number according to the position of the maximum correlation peak value;

the terminal performs correlation processing by using the local auxiliary synchronization signal and the scanned signal, and determines a subframe timing position and a corresponding group number according to the position of the maximum correlation peak value;

and the terminal calculates to obtain the cell identification to be synchronized according to the group sequence number and the group sequence number.

A second aspect of the present application provides a method for cell search of a narrowband assisted wideband, including:

the narrowband system obtains cell information of the broadband system in the coverage area of the narrowband system; the narrow-band system generates a broadcast message carrying the cell information of the wide-band system according to a broadcast message format;

and the narrow-band system issues the broadcast message so that the terminal searches the cell according to the received broadcast message and the cell information of the wide-band system.

A third aspect of the present application provides a narrowband assisted wideband cell search apparatus, including:

a receiving module, configured to receive a broadcast message sent by a narrowband system, where the broadcast message carries cell information of a broadband system in a coverage area of the narrowband system;

and the cell searching module is used for searching the cells of the broadband system according to the cell information of the broadband system.

the cell search module includes:

the first scanning submodule is used for scanning signals in the working frequency band of the broadband system according to the working frequency band index of the broadband system;

the first synchronous signal generation submodule is used for generating a local main synchronous signal and a local auxiliary synchronous signal according to a synchronous signal generation mode specified by a broadband system protocol;

and the correlation processing submodule is used for performing correlation processing on the local main synchronization signal and the local auxiliary synchronization signal and the scanned signals to obtain a frame starting position of the broadband system and a cell identifier to be synchronized.

the cell search module includes:

the second scanning submodule is used for scanning signals in a frequency band supported by the terminal;

a second synchronization signal generation submodule, configured to generate a local primary synchronization signal and a local secondary synchronization signal according to the cell identifier of the broadband system;

and the correlation processing submodule is used for performing correlation processing on the local synchronizing signal and the local auxiliary synchronizing signal with the scanned signal to obtain a frame starting position of the broadband system and a cell identifier to be synchronized.

the cell search module includes:

the third scanning submodule is used for scanning signals in the working frequency band of the broadband system according to the working frequency band index of the broadband system;

a third synchronization signal generation submodule, configured to generate a local primary synchronization signal and a local secondary synchronization signal according to the cell identifier of the broadband system;

Optionally, the third synchronization signal generation sub-module includes:

the main synchronization signal generation submodule is used for determining a root index of a main synchronization signal according to the cell identification of the broadband system and generating a local main synchronization signal according to the root index;

and the auxiliary synchronization signal generation submodule is used for determining the group number of the physical layer cell according to the cell identification of the broadband system and generating a local auxiliary synchronization signal according to the group signal.

Optionally, the correlation processing sub-module includes:

the main synchronous signal processing submodule is used for performing sliding correlation processing by utilizing a local main synchronous signal and a scanned signal and determining a frame timing position and a corresponding in-group serial number according to the position of the maximum correlation peak value;

the auxiliary synchronizing signal processing submodule is used for carrying out correlation processing on the local auxiliary synchronizing signal and the scanned signal and determining a subframe timing position and a corresponding group number according to the position of the maximum correlation peak value;

and the cell identifier calculation submodule is used for calculating the cell identifier to be synchronized according to the group sequence number and the group sequence number.

A fourth aspect of the present application provides a narrowband assisted wideband cell search apparatus, including:

the device comprises an obtaining module, a judging module and a judging module, wherein the obtaining module is used for obtaining cell information of a broadband system in a coverage range of the obtaining module;

a broadcast message generating module, configured to generate a broadcast message carrying cell information of the broadband system according to a broadcast message format;

and the broadcast module is used for issuing the broadcast message so that the terminal can search the cell according to the received broadcast message and the cell information of the broadband system.

The fifth aspect of the present application provides a narrowband auxiliary wideband cell search apparatus, applied to a terminal side, including at least one processor, at least one network interface or other communication interface, a memory, and at least one communication bus; the memory is configured to store program instructions, and the processor is configured to perform the following steps according to the program instructions:

receiving a broadcast message sent by a narrow-band system, wherein the broadcast message carries cell information of a broadband system in the coverage of the narrow-band system; and searching the cell of the broadband system according to the cell information of the broadband system.

Optionally, the system is applied to a narrowband system, and comprises at least one processor, at least one network interface or other communication interface, a memory, and at least one communication bus; the memory is configured to store program instructions, and the processor is configured to perform the following steps according to the program instructions:

obtaining cell information of a broadband system in the coverage area of the broadband system; generating a broadcast message carrying cell information of the broadband system according to a broadcast message format;

and issuing the broadcast message so that the terminal searches the cell according to the received broadcast message and the cell information of the broadband system.

Compared with the prior art, the technical scheme provided by the application has the following beneficial effects:

in the application, a narrow-band system issues a broadcast message, and the broadcast message carries cell information of a wide-band system within the coverage range of the narrow-band system; no matter the cell information acquired by the terminal is the working frequency index of the broadband system, the cell identifier of the broadband system, or the combination of the working frequency index and the cell identifier, or the combination of the cell identifier and the position of the corresponding broadband base station; the terminal searches the cell of the broadband system according to the information, and compared with the prior art that the terminal needs to scan signals in the supported full frequency band and tries all possible broadband cell identifiers to search the cell, the technical scheme provided by the application can greatly reduce the range of the search frequency band or greatly reduce the operation amount of the cell search process by using the cell identifiers, so that the process of the terminal for searching the cell can be accelerated. Compared with the mode that the terminal does not have any auxiliary information and independently realizes the cell search of the broadband system through blind detection in the prior art, the technical scheme provided by the application utilizes the narrowband system to assist the terminal, provides the auxiliary information for the terminal and can help the terminal to quickly realize the cell search of the broadband system.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a flowchart of an embodiment 1 of a method for cell search of a narrowband assisted wideband provided by the present application;

FIG. 2 is a schematic diagram of the wide and narrow band coverage provided herein;

fig. 3 is a flowchart of an embodiment 2 of a method for cell search of a narrowband assisted wideband provided by the present application;

fig. 4 is a structural diagram of an embodiment 1 of a narrowband auxiliary wideband cell search apparatus provided in the present application;

fig. 5 is a structural diagram of an embodiment 2 of a narrowband auxiliary wideband cell search apparatus provided in the present application;

fig. 6 is a hardware structure diagram of a cell search apparatus in embodiment 1 of the narrowband assisted wideband provided in the present application;

fig. 7 is a hardware configuration diagram of an embodiment 2 of a narrowband-assisted wideband cell search apparatus according to the present application.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme provided by the application is applied to the broadband-narrowband fusion networking which is essentially broadband-narrowband cooperative work, wherein the narrowband system can ensure the reliability of voice communication and short message transmission, and the broadband system can ensure the reliability of high-speed and high-capacity multimedia service information transmission. The technical scheme provided by the application is based on the angle, and provides the cell search method and device of the narrowband auxiliary broadband, so that the broadband cell search speed is increased.

According to the technical scheme provided by the application, by utilizing the characteristics of high access speed and long coverage range of the narrow-band system, the narrow-band system completes cell access and completely receives the system messages carried by the broadcast within the time of 100 plus 200ms, and the typical value of the broadband system for completing the cell access needs 2-3s, which is much longer than the time of the narrow-band system. When the terminal accesses the initial system, the narrow band access speed is high, and after the narrow band is accessed, the narrow band system issues some cell information required by the initial access of the terminal, such as the working frequency index of the broadband system and the cell identification which can be accessed into the cell, so that the blind detection range is reduced, the calculation amount is reduced, and the cell search process is accelerated; the narrow-band coverage range is far from the wide-band coverage range, and when the terminal needs to perform cell switching or loses the wide band and needs to perform cell search, some cell information required by initial access of the terminal can be issued through the narrow-band system.

Referring to fig. 1, fig. 1 is a flowchart of an embodiment 1 of a method for cell search of narrowband assisted broadband provided by the present application, where the method shown in fig. 1 is applied to a terminal side, and the method may include:

step 101: and the terminal receives a broadcast message sent by a narrow-band system, wherein the broadcast message carries the cell information of the broadband system within the coverage range of the narrow-band system.

For ease of explanation, the narrowband and wideband system will be briefly described below with reference to fig. 2.

Referring to fig. 2, fig. 2 is a schematic diagram of the coverage of the wideband and narrowband provided by the present application; as shown in fig. 2, in the broadband-narrowband converged networking system, the coverage area of the narrowband system is generally larger than that of the broadband system, and there may be a plurality of cells of the broadband system in the coverage area of the narrowband system. When the network is initially established, the broadband system may send the cell identifier in its coverage area and the operating frequency index of the broadband system to the narrowband system. The wideband system can also respond to a cell information query request initiated by the narrowband system and feed back a cell identifier in the coverage area of the narrowband system and an operating frequency index of the wideband system to the narrowband system.

The narrowband system is a PDT (Police Digital Trunking) system, a narrowband Digital Trunking system TETRA, or another narrowband private network system. And the broadband system refers to an LTE system or other broadband private network systems.

After the narrowband system obtains the cell information of the broadband system in the coverage area of the narrowband system, the narrowband system generates a broadcast message, and the broadcast message carries the cell information of the broadband system, such as an operating frequency index and/or a cell identifier; of course, the necessary system information required by the terminal should also be carried in the broadcast message in general.

For the terminal, the terminal needs to perform cell search of the narrowband system first, complete time synchronization and frequency synchronization with the narrowband system, and after synchronization is completed, the terminal can perform cell access and receive broadcast messages.

The process of accessing the terminal to the narrow-band system is as follows: after a terminal searches SYNC (synchronous signal) to realize frame synchronization, a universal notification channel (CACH) message is demodulated to obtain a frame number and a time slot number, and then system information (especially an access time window) is obtained from a Broadcast Control Channel (BCCH); the terminal sends a random access signaling (C _ RAND) to the base station according to the acquired frame number and time slot number, and the base station feeds back confirmation information (C _ ACKD) to realize successful access.

After the terminal accesses the narrow band system, the terminal can receive the broadcast message sent by the narrow band system, and then the terminal demodulates the broadcast message to acquire necessary system information and cell information of the broadband system from the broadcast message.

Step 102: and the terminal searches the cell of the broadband system according to the cell information of the broadband system.

In the prior art, a terminal scans signals in a frequency band supported by the terminal, and generates a local primary synchronization signal and a local secondary synchronization signal according to a mode specified by a broadband system protocol to perform cell search. The mode specified by the broadband system protocol comprises the following steps: CELL identity (CELL ID) in LTE system defines 504 possible values, from 0 to 503; the 504 CELL IDs were divided into 168 groups of 3.

Wherein the content of the first and second substances,

is the CELL ID, and the CELL ID,

the group number of the packet is represented by 168 values, from 0 to 167.

The number in the group is represented, and 3 values are provided, from 0 to 2. Wherein PSS corresponds to

3 of Zadoff-Chu sequence

Corresponding to 3 kinds of master synchronization signals. SSS is

And

there are related interleaved m-sequences. It can be seen that there are 3 primary synchronization signals and 168 secondary synchronization signals.

In this embodiment, step 202 has different implementation manners according to the cell information including different contents. The following explains the specific implementation of step 102.

In a first implementation manner of step 102, the cell information includes: the working frequency band index of the broadband system; the terminal carries out the cell search of the broadband system according to the cell information of the broadband system, and the cell search comprises the following steps:

the terminal uses the local main synchronizing signal and the local auxiliary synchronizing signal to perform sliding correlation processing with the scanned signals to obtain the frame starting position of the broadband system and the cell identification to be synchronized.

With the first implementation manner of step 102, the terminal does not need to search for signals within the frequency band range supported by the terminal, but rather, the terminal searches for signals only within the working frequency band of the broadband system in a targeted manner, so that the terminal can search for a reduced scanning range according to the cell information, reduce the amount of computation, and thus improve the cell search speed.

A first implementation of step 102 is explained below by way of example 1.

In example 1, the broadcast message sent by the narrowband system carries an operating frequency index (Band 33) of the broadband system in its coverage. The terminal demodulates the working frequency band index from the narrow-band broadcast message, and determines the working frequency band of the broadband system to be 1900-1920 MHz according to the index; suppose that the terminal supports the frequency band 33, the frequency band 38(2570MHz-2620MHz) and the frequency band 40(2300MHz-2400MHz), but with the first implementation, the terminal directly scans signals within 1900MHz-1920MHz without performing comprehensive scanning, that is, the terminal does not need to scan in all the frequency bands supported by the terminal, so that the scanning range is reduced, and the subsequent operation amount is reduced.

In a second implementation manner of step 102, the cell information of the broadband system includes: a cell identity; the terminal carries out the cell search of the broadband system according to the cell information of the broadband system, and the cell search comprises the following steps:

the terminal scans signals in a frequency band supported by the terminal;

and the terminal performs sliding correlation processing on the local synchronizing signal and the local auxiliary synchronizing signal with the scanned signal to obtain a frame starting position of the broadband system and a cell identifier to be synchronized.

With the second implementation manner of step 102, although the terminal searches for signals within the supported frequency band range, the terminal generates the local primary synchronization signal and the local secondary synchronization signal according to the cell identifier of the broadband system, and compared with the prior art in which the terminal processes according to the 3 PSS and 168 SSS specified by the broadband system protocol, this manner greatly reduces the signal correlation operation, reduces the amount of computation, and thus improves the cell search speed.

A second implementation of step 202 is explained below by way of example 2.

Example 2, a broadcast message sent by the narrowband system carries the cell identifier (here, set as 48, 51, 54, 57, 60, 63) of the wideband system in its coverage. The terminal demodulates the cell identifications from the narrowband broadcast message, and then calculates a possible intra-cell group number N1 ═ {0} and a possible cell group number N2 ═ {16,17,18,19,20,21} from the cell identifications; from the intra-group numbering of 0, the root sequence number can be obtained by table lookup

Generating a local PSS sequence according to the value, performing sliding correlation on the local PSS sequence and the scanned sequence, and finding out a maximum point of a correlation peak value, wherein the position of the maximum point is a timing position; and then, generating local SSS sequences by the group numbers and the intra-group numbers in the set N2, performing sliding correlation on each SSS and the received sequences to find out the maximum point of the correlation peak, wherein the position of the maximum point corresponds to the position of the maximum point

I.e. the corresponding cell group number (here set to 16). By

The available cell identity is 48. It can be seen that, with the second implementation, the terminal does not need to traverse all possible cell group numbers (168) and cell intra-group numbers (3), but reduces the processing range, reduces the amount of computation, and improves the cell search rate according to the cell identifier of the broadband system issued by the narrowband system.

In a third implementation manner of step 102, the cell information of the broadband system includes: an operating frequency band index and a cell identifier; the terminal carries out the cell search of the broadband system according to the cell information of the broadband system, and the cell search comprises the following steps:

By using the third implementation manner of step 102, the terminal does not need to search for signals within the frequency band range supported by the terminal, but rather, the terminal searches for signals within the working frequency band of the broadband system in a targeted manner, so that the terminal can search for a reduced scanning range according to cell information, reduce the amount of computation, and improve the cell search speed; compared with the prior art that the terminal processes the local primary synchronization signal and the local secondary synchronization signal according to the 3 PSS and 168 SSS modes specified by the broadband system protocol, the method greatly reduces the signal correlation operation and the operation amount, thereby improving the cell search speed.

A third implementation of step 102 is explained below by way of example 3.

In example 3, the broadcast message sent by the narrowband system carries the operating frequency Band index (Band 33) of the broadband system and the cell identifier (here, set to 48, 51, 54, 57, 60, 63) of the broadband system in its coverage. The terminal demodulates the working frequency band index and the cell identification from the narrow-band broadcast message, and determines the working frequency band of the broadband system to be 1900-1920 MHz according to the index; suppose that the terminal supports a frequency band 33, a frequency band 38(2570MHz-2620MHz) and a frequency band 40(2300MHz-2400MHz), but with the third implementation, the terminal directly scans signals within 1900MHz-1920MHz without performing full scanning, that is, the terminal does not need to scan in all the frequency bands supported by the terminal, so that the scanning range is reduced, and the subsequent operation amount is reduced. In addition, the terminal may calculate, according to the demodulated cell identifier, a possible intra-cell group number N1 ═ {0} and a possible cell group number N2 ═ {16,17,18,19,20,21 }; from the intra-group numbering of 0, the root sequence number can be obtained by table lookup

I.e. the corresponding cell group number (here set to 16). By

The available cell identity is 48.

It can be seen that, with the third implementation, the terminal does not need to traverse all possible cell group numbers (168) and cell intra-group numbers (3), but reduces the processing range, reduces the amount of computation, and improves the cell search rate according to the cell identifier of the broadband system issued by the narrowband system.

In the second and third implementations described above, the steps of: the terminal generates a local primary synchronization signal and a local secondary synchronization signal according to the cell identifier of the broadband system, and may include:

Wherein, the expression form of the main synchronizing signal is a sequence, the sequence d (n) of the main synchronizing signal is generated by a frequency domain Zadoff-Chu sequence, and the expression form is as follows:

formula (1)

Wherein the Zadoff-Chu root index u is given by table 6.11.1.1-1 in protocol 3GPP TS36.211, and also corresponds to the cell ID number.

Table 6.11.1.1-1 root index of Primary Sync Signal

When the method is realized, the terminal identifies according to the cell of the broadband system and the terminal follows the formula

Calculating the serial number in the group corresponding to the cell ID, determining the root index according to the above table 6.11.1.1-1, and further determining the rootAnd calculating the local master synchronization signal of the terminal according to the index and the formula (1).

The representation form of the secondary synchronization signal is also a sequence, and the sequence of the secondary synchronization signal is formed by interleaving and cascading two M sequences with the length of 31 to obtain a sequence with the length of 62. In a radio frame, the interleaving and cascading mode of the SSS in the subframe 0 is different from the interleaving and cascading mode of the SSS in the subframe 5, so that the terminal can distinguish the initial position of the radio frame, namely the frame synchronization position, by detecting the SSS sequence. In order to improve the identification of synchronization signals between different cells, the SSS uses two sets of scrambling codes for scrambling: the first group scrambling code is numbered by the cell group corresponding to the index number of the primary synchronization sequence

Determining and scrambling two groups of SSS sequences together; a second group of scrambling codes consisting of

It is decided to scramble the SSS sequences on odd subcarriers twice. The SSS is generated according to the following formula:

formula (2)

Formula (3)

Wherein, 0<＝n<SSS index (m0, m1) numbered by cell group 30

As determined by table 6.11.2.1-1 in 3GPP TS 36.211.

And

is composed of

Two different cyclic shifts of, i.e.

Wherein the content of the first and second substances,

is defined by the following formula,

the initial state is x (0) ═ 0, x (1) ═ 0, x (2) ═ 0, x (3) ═ 0, and x (4) ═ 1.

Scrambling sequence c₀(n)、c₁(n) is determined by the primary synchronization signal, by the m-sequence

Different cyclic shift acquisition is performed to obtain,

wherein the content of the first and second substances,

is defined by the following formula,

Scrambling sequences

From m sequences

Different cyclic shift acquisition is performed to obtain,

wherein the content of the first and second substances,

is defined by the following formula,

When the method is realized, the terminal identifies the cell of the broadband system according to the formula

mod3 calculates the cell group number and then calculates the terminal local secondary synchronization signal according to equations (2) and (3).

It can be seen that the terminal obtains the cell identifier of the broadband system, the cell group number and the intra-group number can be determined according to the cell identifier, and then the local PSS and the local SSS of the terminal are generated according to the above formulas (1), (2) and (3), without adopting the conventional global mode, that is, without processing according to all possible cell group numbers (168) and all possible intra-group numbers (3), thereby greatly reducing the computation workload.

In the above three implementations, the steps: the terminal uses the local synchronization signal and the local auxiliary synchronization signal to perform sliding correlation processing with the scanned signal to obtain the frame start position of the broadband system and the cell identifier to be synchronized, and the method comprises the following steps:

By using the method, the terminal realizes the numbering in the cell group after detecting the PSS of the broadband system

And realizing identification of field synchronization (0.5ms frame synchronization), and realizing frame synchronization and cell group numbering after detecting SSS of the broadband system

And finally, according to the formula

And calculating the cell identification to be synchronized.

In a fourth implementation manner of step 102, the cell information of the broadband system includes: the cell identification and the position of the broadband base station to which the cell identified by the cell identification belongs; the terminal carries out the cell search of the broadband system according to the cell information of the broadband system, and the cell search comprises the following steps:

the terminal scans signals in a frequency band supported by the terminal;

With the fourth implementation manner of step 102, the terminal can calculate the distance between the terminal itself and the broadband base station according to the position of the broadband base station, select the closest broadband base station (i.e., N takes a value of 1) to itself, and further select the cell identifier of the cell covered by the broadband base station; of course, the first N broadband base stations from near to far may also be selected, for example, if N takes a value of 3, then 3 broadband base stations are selected according to the distance relationship, and then the cell identifier of the cell covered by the 3 broadband base stations is determined. Thus, the signal correlation operation can be greatly reduced, the operation amount is reduced, and the cell search speed is improved.

For each step in the fourth implementation manner of step 102, reference may be made to the description of the relevant step in the second implementation manner and the third implementation manner above, and details are not described here again. The cell search method of the narrowband auxiliary wideband at the terminal side is explained above. The following explains the method on the system side.

Referring to fig. 3, fig. 3 is a flowchart of embodiment 2 of a narrowband-assisted wideband cell search method provided in the present application, where the method is applied in a narrowband system, and as shown in fig. 3, the method may include:

step 301: the narrowband system obtains cell information of the broadband system in the coverage area of the narrowband system; wherein the cell information may include: an operating frequency band index and/or a cell identity;

step 302: the narrow-band system generates a broadcast message carrying the cell information of the wide-band system according to a broadcast message format;

step 303: and the narrow-band system issues the broadcast message so that the terminal searches the cell according to the received broadcast message and the cell information of the wide-band system.

When the method is implemented, the narrowband system can bear the cell information of the broadband system in the reserved field according to the data frame format of the broadcast message to generate the broadcast message.

For example, when the narrowband system is a PDT system, cell information of the broadband system may be carried in the first frame to the fourth frame data portions in accordance with a data frame format of the broadcast message to generate the broadcast message. By using the method of the application, the narrow-band system issues the broadcast message carrying the cell information of the broadband system in the coverage area of the narrow-band system to assist the terminal to know the cell information of the broadband system, so that the cell search of the broadband system is performed in a targeted manner, the scanning range is reduced, the calculation amount is reduced, and the cell search speed is improved.

Corresponding to the method shown in fig. 1, the present application also provides a device applied to the terminal side.

Referring to fig. 4, fig. 4 is a block diagram of an embodiment 1 of a narrowband-assisted wideband cell search apparatus provided in the present application, and as shown in fig. 4, the apparatus may include:

a receiving module 401, configured to receive a broadcast message sent by a narrowband system, where the broadcast message carries cell information of a broadband system in a coverage area of the narrowband system; wherein the cell information may include: an operating frequency band index and/or a cell identity;

a cell search module 402, configured to perform cell search of the broadband system according to the cell information of the broadband system.

When implemented, the cell information of the broadband system includes: indexing the working frequency band;

the cell search module includes:

When implemented, the cell information of the broadband system includes: a cell identity;

the cell search module includes:

When implemented, the cell information of the broadband system includes: an operating frequency band index and a cell identifier;

the cell search module includes:

When implemented, the third synchronization signal generation submodule includes:

When implemented, the cell information of the broadband system includes: the cell identification and the position of the broadband base station to which the cell identified by the cell identification belongs;

the cell search module includes:

the cell identification selection submodule is used for calculating the distance between the broadband base station and the terminal, selecting N broadband base stations close to the terminal according to the distance relation and determining the cell identification corresponding to the selected broadband base stations; the value of N is a positive integer greater than or equal to 1;

the fourth scanning submodule is used for scanning signals in a frequency band supported by the fourth scanning submodule;

a fourth synchronization signal generation submodule, configured to generate a local primary synchronization signal and a local secondary synchronization signal according to the determined cell identifier;

When implemented, the correlation processing submodule includes:

and the cell identifier calculation submodule is used for calculating the cell identifier to be synchronized according to the group sequence number and the group sequence number. The terminal can know the cell information of the broadband system by using the device provided by the application, and then the cell search of the broadband system is carried out in a targeted manner, so that the scanning range is reduced, the calculation amount is reduced, and the cell search speed is improved.

Corresponding to the method shown in fig. 3, the present application also provides a device applied to the narrowband system side.

Referring to fig. 5, fig. 5 is a block diagram of an embodiment 2 of a narrowband-assisted wideband cell search apparatus provided in the present application, and as shown in fig. 5, the apparatus may include:

an obtaining module 501, configured to obtain cell information of a broadband system in a coverage area of the obtaining module; the cell information includes: an operating frequency band index and/or a cell identity;

a broadcast message generating module 502, configured to generate a broadcast message carrying cell information of the broadband system according to a broadcast message format;

the broadcast module 503 is configured to issue the broadcast message, so that the terminal performs cell search according to the received broadcast message and the cell information of the broadband system.

Further, the embodiments of the present invention also provide hardware configurations of the above devices on the terminal side and the narrowband system side, where each of the above devices may include at least one processor (e.g., CPU), at least one network interface or other communication interface, a memory, and at least one communication bus, and is used to implement connection communication between these devices. The processor is used to execute executable modules, such as computer programs, stored in the memory. The Memory may be a volatile Memory (volatile Memory) such as a Random Access Memory (RAM), or a non-volatile Memory (non-volatile Memory) such as a Read Only Memory (ROM), a flash Memory (flash Memory), a Hard Disk Drive (HDD), or a Solid State Drive (SSD). The communication connection between the base station and at least one other network element is realized through at least one network interface (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network and the like can be used.

Referring to fig. 6, in some embodiments, the memory has stored therein executable modules that are executable by the processor, wherein the executable modules include: the modules shown in fig. 4, and specific implementation of the modules may be referred to the description of fig. 4 above, and are not described here again.

Referring to fig. 7, in some embodiments, the memory has stored therein executable modules that are executable by the processor, wherein the executable modules include: the modules shown in FIG. 5; the specific implementation of each module may refer to the description of fig. 5 above, and is not described here again.

It should be appreciated that the invention is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.

The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

The foregoing is directed to embodiments of the present invention, and it is understood that various modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention.

Claims

1. A method for searching a cell of a narrowband auxiliary broadband is characterized by comprising the following steps:

a terminal receives a broadcast message sent by a narrow-band system, wherein the broadcast message carries cell information of a broadband system in the coverage of the narrow-band system;

the terminal searches the cell of the broadband system according to the cell information of the broadband system;

the cell information of the broadband system includes: an operating frequency band index and a cell identifier;

the terminal determines the group number of the physical layer cell according to the cell identification of the broadband system, and generates a local auxiliary synchronization signal according to the group signal;

2. The method of claim 1,

the cell information of the broadband system includes: indexing the working frequency band;

3. The method of claim 1,

the cell information of the broadband system includes: a cell identity;

the terminal scans signals in a frequency band supported by the terminal;

4. The method of claim 1, wherein the cell information of the broadband system comprises: the cell identification and the position of the broadband base station to which the cell identified by the cell identification belongs;

the terminal scans signals in a frequency band supported by the terminal;

5. The method according to any one of claims 1 to 4, wherein the terminal performs correlation processing on the local synchronization signal and the local secondary synchronization signal with the scanned signal to obtain a frame start position of a broadband system and a cell identifier to be synchronized, including:

6. A method for searching a cell of a narrowband auxiliary broadband is characterized by comprising the following steps:

the narrow-band system issues the broadcast message so that the terminal searches the cell according to the received broadcast message and the cell information of the wide-band system;

7. A narrowband-assisted wideband cell search apparatus, comprising:

the cell search module is used for searching the cells of the broadband system according to the cell information of the broadband system;

the cell search module includes:

the third scanning submodule is used for scanning signals in the working frequency band of the broadband system by the terminal according to the working frequency band index of the broadband system;

a third synchronization signal generation submodule comprising:

the main synchronization signal generation submodule is used for determining a root index of a main synchronization signal by the terminal according to the cell identification of the broadband system and generating a local main synchronization signal according to the root index;

the auxiliary synchronization signal generation submodule is used for determining the group number of the physical layer cell by the terminal according to the cell identification of the broadband system and generating a local auxiliary synchronization signal according to the group signal;

and the correlation processing submodule is used for the terminal to perform correlation processing on the local synchronizing signal and the local auxiliary synchronizing signal with the scanned signal to obtain the frame starting position of the broadband system and the cell identifier to be synchronized.

8. The apparatus of claim 7,

the cell search module includes:

9. The apparatus of claim 7,

the cell information of the broadband system includes: a cell identity;

the cell search module includes:

10. The apparatus of claim 7, wherein the cell information of the broadband system comprises: the cell identification and the position of the broadband base station to which the cell identified by the cell identification belongs;

the cell search module includes:

11. The apparatus of any one of claims 7 to 10, wherein the correlation processing submodule comprises:

12. A narrowband-assisted wideband cell search apparatus, comprising:

the broadcast module is used for issuing the broadcast message so that the terminal can search the cell according to the received broadcast message and the cell information of the broadband system;

13. A cell search device with narrowband auxiliary broadband is characterized by being applied to a terminal side and comprising at least one processor, at least one network interface or other communication interface, a memory and at least one communication bus; the memory is configured to store program instructions, and the processor is configured to perform the following steps according to the program instructions:

receiving a broadcast message sent by a narrow-band system, wherein the broadcast message carries cell information of a broadband system in the coverage of the narrow-band system; carrying out cell search of the broadband system according to the cell information of the broadband system;

14. A narrowband-assisted broadband cell search device is applied to a narrowband system and comprises at least one processor, at least one network interface or other communication interface, a memory and at least one communication bus; the memory is configured to store program instructions, and the processor is configured to perform the following steps according to the program instructions:

issuing the broadcast message so that the terminal searches the cell according to the received broadcast message and the cell information of the broadband system;