WO2010075731A1

WO2010075731A1 - Configuration method and equipment for secondary synchronization channel and mapping method and equipment for subcarriers

Info

Publication number: WO2010075731A1
Application number: PCT/CN2009/075524
Authority: WO
Inventors: 孙长印; 方惠英; 王文焕; 曲红云; 鲁照华
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-01-05
Filing date: 2009-12-11
Publication date: 2010-07-08
Also published as: CN101772148A; CN101772148B

Abstract

A configuration method and an equipment for a secondary synchronization channel, and a mapping method and an equipment for subcarriers are provided by the present invention. The configuration method for a secondary synchronization channel comprises: configuring the first basic sequence set which is applied to indicate the combinations of cell IDs and sector IDs carried by a secondary synchronization channel of a macro base station; and/or configuring the second basic sequence set which is applied to indicate the combinations of cell IDs and sector IDs of a macro base station which a Femto base station belongs to, and the Femto base station ID sequence set which is applied to indicate the ID information of the Femto base station. With the help of the present invention, mapping the information in the synchronizing signal of secondary synchronization channel in OFDM system and generating a synchronizing signal via the sequences in the sequence set can identify the ID information and the types of base stations explicitly and can adapt the alterations of base stations flexibly, which helps to optimize the performance of the system.

Description

Method and device for configuring secondary synchronization channel, subcarrier mapping method and device

The present invention relates to the field of communications, and in particular, to a method and apparatus for configuring a secondary synchronization channel, a method and apparatus for subcarrier mapping, and a method and apparatus for transmitting a synchronization signal of a secondary synchronization channel. Background technique

Orthogonal Frequency Division Multiplex (OFDM) is a multi-carrier transmission technology that can effectively reduce system-to-multipath by converting a high-speed data stream into a set of low-speed parallel data streams. Sensitivity of fading channel frequency selectivity; by introducing a cyclic prefix, the system can also enhance the ability of the system to resist Inter-symbol Interference (ISI); in addition, the technology also has the characteristics of high bandwidth utilization and implementation of the single-chip. With the above advantages, OFDM technology is increasingly used in wireless communication watersheds, for example, Wireless Local Area Network (WLAN) systems, 802.16e systems based on Orthogonal Frequency Division Multiple Access, and 802.16. e The next generation of evolved 802.16m systems (fourth generation communication systems) and the like are all systems of OFDM technology.

For a mobile communication system, the terminal usually needs to access the network by means of a synchronization channel. Generally, the access step may include:

(1) Time and frequency synchronization;

(2) Cell ID (Cell ID) detection;

(3) Broadcast message reading.

By adopting the above steps, the terminal can start the subsequent access process according to the information in the broadcast message.

For mobile communication systems, the access process is a very important process. An important indicator of the access process is the access time. The shorter the access time, the higher the system performance. but, Since access needs to be implemented by means of a synchronization channel, resource occupation will constitute an overhead relative to a traffic channel transmitting user information. Therefore, if it is desired to construct a mobile communication system with excellent performance, it is necessary to balance between access performance and synchronization channel resource occupation.

In order to meet the application requirements of low-latency services in the next-generation broadband wireless communication system, in the design of the current 16m frame structure, the three-layer design idea of superframe, unit frame and subframe is mainly considered. As shown in Fig. 1, superframe 101 is composed of 4 unit frames 102, and superframe control information 103 is located on a number of symbols at the beginning of the superframe. The unit frame 102 is composed of 8 subframe units 104, and the subframe unit 104 is divided into a downlink subframe unit and an uplink subframe unit, which can be configured according to the system. The subframe unit 104 is composed of six OFDM symbols 105.

Generally, the superframe, unit frame, and subframe three-layer frame structure adopts a layered synchronization channel design, that is, the synchronization channel is divided into a primary synchronization channel (P-SCH) and a secondary synchronization channel (Synchronization Channel, S- SCH). In the fourth generation communication system, the type of the base station system is more diverse, and is divided into a macro base station (cell), a micro base station (cell), a home base station (Femto BS, which may also be called a sub base station, etc.), and a relay (Relay). Base stations, etc., different base station systems also have different system configurations, for example, different system bandwidths, different multi-carrier modes, and the like.

Since a macro base station may deploy hundreds or even thousands of Femto base stations, Femto base stations are not only a large number, but also the number and the correlation between base stations are easily changed. Therefore, the types, cell ID information, and the like of these base stations can be clearly understood. The information is clearly expressed to be very important for achieving communication between the base station and the terminal. However, an effective solution has not been proposed for the purpose of designing a synchronization channel to identify cell ID information of different types of base stations and satisfying the expansion requirements of the Femto base station while maintaining the synchronization channel design. Summary of the invention

The present invention has been made in view of the problem that the synchronization channel design scheme in the related art cannot clearly identify the cell ID information of different types of base stations and the expansion requirements of the Femto base station. To this end, the main object of the present invention is to provide a configuration scheme of a secondary synchronization channel, a subcarrier mapping scheme, and a synchronization signal transmission scheme of a secondary synchronization channel.

According to an aspect of the present invention, a method for configuring a secondary synchronization channel for configuring a synchronization signal on a secondary synchronization channel in an orthogonal frequency division multiplexing system is provided.

A method for configuring a secondary synchronization channel according to the present invention includes: configuring a first basic sequence set for indicating each combination of a cell ID and a sector ID carried by a secondary synchronization channel of a macro base station; and/or configuring to indicate a home base station A second basic sequence set of each combination of a cell ID and a sector ID of the associated macro base station, and a home base station ID sequence set for indicating ID information of the home base station.

The process of configuring the first basic sequence set may include: determining a first mapping relationship table between each combination of a cell ID and a sector ID carried by the secondary synchronization channel of the macro base station and the first basic sequence set sequence.

And after configuring the first basic sequence set, searching, according to the combination of the actual cell ID and the actual sector ID under the macro base station, and the first mapping relationship table, searching for the corresponding first sequence from the first basic sequence set as the macro base station. Synchronization sequence.

In addition, in the method, the process of configuring the second basic sequence set may include: determining a second mapping relationship table of each combination of the cell ID and the sector ID of the belonging macro base station of the home base station and the second sequence set sequence, and determining A third mapping relationship table between the ID information of the home base station and the sequence sequence of the home base station ID sequence.

After the second basic sequence set is configured, the second sequence may be searched for from the second basic sequence according to the combination of the actual cell ID and the actual sector ID of the macro base station to which the home base station belongs, and the second mapping relationship table. And searching for a corresponding third sequence from the family base station ID sequence according to the actual ID information of the home base station and the third mapping relationship table, and combining the second sequence and the third sequence to obtain a synchronization sequence of the home base station.

Preferably, the manner of combining the second sequence and the third sequence comprises at least one of the following: dot product, frequency division combination, and interlace combination. Preferably, the sequence of the basic sequence set and the set of home base station ID sequences comprise at least one of the following: a pseudo random sequence, a zero correlation sequence, an orthogonal sequence, a differential sequence of a pseudo random sequence, a differential sequence of zero correlation sequences, an orthogonal sequence Differential sequence.

According to another aspect of the present invention, a method for configuring a secondary synchronization channel for configuring a synchronization signal on a secondary synchronization channel in an orthogonal frequency division multiplexing system is provided.

The method for configuring a secondary synchronization channel according to this embodiment includes: dividing cell ID information carried in a synchronization signal into a plurality of ID subsets according to system configuration information; and configuring, for each ID subset, a type sequence for indicating a type thereof Set, and a set of basic sequences used to represent ID information within its subset.

The system configuration information includes base station type information and/or multi-carrier configuration information, where the base station type includes a macro base station, and/or a home base station, and/or a relay base station, and the multi-carrier configuration includes a fully configured carrier and/or a partial configuration. Carrier.

Moreover, the plurality of ID subsets obtained by the partitioning may include at least one of the following: a macro base station cell ID subset, a home base station cell ID subset, and a relay base station cell ID subset.

And, the processing of configuring the sequence set and the basic sequence set may include at least one of the following: for the macro base station cell ID subset, dividing the cell ID into the packet information, the cell ID in the packet, and the sector ID in the packet Information, and the type sequence of the configured type sequence set respectively represents the fully configured carrier, the partial configuration carrier, and the cell ID packet number, and the basic sequence of the configured basic sequence set represents the cell ID information within the packet and the sector within the packet Various combinations of ID information;

For the family base station cell ID subset, the family base station cell is represented by the type sequence of the configured type sequence set, and the home base station cell ID information is represented by the basic sequence of the configured basic sequence set;

For the relay base station cell ID subset, the relay base station is represented by the type sequence of the configured type sequence set, and the relay base station ID information is represented by the basic sequence of the configured basic sequence set. Further, after configuring the type sequence set and the base sequence set, the method may further include at least one of the following processes:

For the macro base station, the corresponding basic sequence is selected from the configured basic sequence set according to the combination of the actual cell ID and the sector ID, and the selected basic sequence is combined with the type sequence corresponding to the macro base station in the type sequence set to obtain the secondary synchronization of the macro base station. Synchronization sequence of the channel;

For the home base station, the corresponding basic sequence is selected according to the actual home base station cell ID from the configured basic sequence set, and the selected basic sequence is combined with the type sequence corresponding to the family base station in the type sequence set to obtain the synchronization sequence of the secondary synchronization channel of the home base station. ;

For the relay base station, the corresponding basic sequence is selected according to the actual relay base station cell ID from the configured basic sequence set, and the selected basic sequence is combined with the type sequence corresponding to the type sequence centralized relay base station to obtain the secondary synchronization of the relay base station. The synchronization sequence of the channel.

Preferably, the sequence in the basic sequence set and the sequence in the type sequence set include at least one of the following: a pseudo random sequence, a zero correlation sequence, an orthogonal sequence, a differential sequence of a pseudo random sequence, a differential sequence of a zero correlation sequence, an orthogonal sequence Differential sequence.

According to another aspect of the present invention, a seed carrier mapping method is provided for mapping a synchronization sequence of a secondary synchronization channel in an orthogonal frequency division multiplexing system to a subcarrier.

The subcarrier mapping method according to the present invention includes: in the case where the number of useful subcarriers is L, for subcarriers whose subcarrier numbers are smaller than L/2, subcarrier mapping of different sectors is performed according to the following formula:

x(n) = x(3u + k), k = 0,1,2. u = 0,1,2,...,

Where k is the sector number and u is the element number in the sequence;

For subcarriers with subcarrier numbers greater than L/2, subcarrier mapping for different sectors is performed according to the following formula:

y(n) = y(3u + mod(k + round(3u/^/2))), ), k = 0,1,2. w = 0,1,2,...,

Where mod is the remainder operation and round is the rounding operation. According to another aspect of the present invention, a secondary synchronization channel configuration apparatus is provided for configuring a synchronization signal on a secondary synchronization channel in an orthogonal frequency division multiplexing system.

The apparatus for configuring a secondary synchronization channel according to the present invention includes: a first configuration module, configured to configure a first basic sequence set for indicating each combination of a cell ID and a sector ID carried by a secondary synchronization channel of the macro base station; and/or And a second configuration module, configured to configure a second basic sequence set for indicating each combination of a cell ID and a sector ID of the associated macro base station of the home base station, and a home base station ID sequence set for indicating ID information of the home base station.

According to another aspect of the present invention, there is provided a configuration apparatus for a secondary synchronization channel for configuring a synchronization signal on a secondary synchronization channel in an orthogonal frequency division multiplexing system.

The configuration device of the secondary synchronization channel according to the present invention includes: a dividing module, configured to divide the cell ID information carried in the synchronization signal into a plurality of ID subsets according to system configuration information; and a first configuration module, configured to use each ID sub- The set configuration is used to represent a type sequence set of the corresponding ID subset type; the second configuration module is configured to configure, for each ID sub-set, a basic sequence set for indicating ID information in a subset of the corresponding ID subset.

According to another aspect of the present invention, a seed carrier mapping apparatus is provided for mapping a synchronization sequence of a secondary synchronization channel in an orthogonal frequency division multiplexing system to a subcarrier, wherein the number of useful subcarriers is L.

The subcarrier mapping apparatus according to the present invention includes: a first mapping module, configured to perform subcarrier mapping of different sectors on subcarriers whose subcarrier numbers are smaller than L/2 according to the following formula:

x(n) = x(3u + k), k = 0,1,2. u = 0,1,2,..., where k represents the sector number and u represents the element number in the sequence;

a second mapping module, configured to perform subcarrier mapping of different sectors on subcarriers with subcarrier numbers greater than L/2 according to the following formula:

y(n) = y(3u + mod(k + round(3u/^/2))), ), k = 0,1,2. 1⁄2 = 0,1,2,...,

Where mod is the remainder operation and round is the rounding operation. According to another aspect of the present invention, a synchronization signal transmission method for a secondary synchronization channel for transmitting a secondary synchronization sequence of a synchronization signal of an orthogonal frequency division multiplexing system is provided.

A synchronization signal transmission method of a secondary synchronization channel according to the present invention includes:

According to the requirements of the system for the secondary synchronization sequence, for the system with the basic bandwidth, the secondary synchronization sequence is configured as x=2 ⁿ +c, where X is the length of the secondary synchronization sequence, and 2 ^{n is} less than or equal to the secondary synchronization sequence required by the system. Length; For systems where the system bandwidth is a multiple of the base bandwidth, configure the secondary synchronization sequence to be x = mx 2 ⁿ + c, where m is a multiple; transmit the configured secondary synchronization sequence through the antenna at the transmitting end.

According to another aspect of the present invention, a synchronization signal transmitting apparatus for a secondary synchronization channel for transmitting a secondary synchronization sequence of a synchronization signal of an orthogonal frequency division multiplexing system is provided.

The synchronization signal transmitting apparatus of the secondary synchronization channel according to the present invention includes: a configuration module, configured to configure a secondary synchronization sequence to x = 2 ⁿ + c for a system of a basic bandwidth according to a system requirement for a secondary synchronization sequence, wherein, X For the length of the secondary synchronization sequence, 2 ^{n is} less than or equal to the length of the secondary synchronization sequence required by the system; and for systems where the system bandwidth is a multiple of the base bandwidth, the secondary synchronization sequence is configured to be x = mx 2 ⁿ + c, where m Is a multiple; a transmitting module, configured to transmit a secondary synchronization sequence through an antenna.

With the above technical solution of the present invention, the information in the synchronization signal on the secondary synchronization channel in the orthogonal frequency division multiplexing system is mapped and the synchronization signal is generated by the sequence in the sequence set, thereby solving the synchronous channel design scheme in the related art. Clearly identifying the cell ID information of different types of base stations and the problem of not meeting the expansion requirements of the Femto base station, the type and ID information of each base station can be clearly identified, and the various changes of the base station can be flexibly adapted, which is helpful. Optimize system performance. DRAWINGS

1 is a schematic diagram of a frame structure according to the related art;

2 is a schematic structural diagram of a P-SCH and an S-SCH according to the related art; 3 is a flowchart of a method for configuring a secondary synchronization channel according to Embodiment 1 of the method of the present invention; FIG. 4 is a schematic diagram of a method for configuring a secondary synchronization channel according to Embodiment 1 of the present invention;

Schematic diagram of processing of a synchronization sequence of a secondary synchronization channel of a Femto base station;

5 is a schematic diagram of a specific example of a cell packet according to an embodiment of the present invention; FIG. 6 is a schematic diagram of processing of a subcarrier mapping according to an embodiment of the present invention;

7 is a schematic diagram of subcarrier mapping performed by a carrier mapping method according to an embodiment of the present invention; FIG. 8 is a flowchart of processing performed by a terminal for cell search according to an embodiment of the present invention; FIG. 9 is a secondary synchronization according to Embodiment 1 of the apparatus according to the present invention; FIG. 10 is a block diagram of a method for configuring a secondary synchronization channel according to Embodiment 2 of the method of the present invention; FIG. 11 is a block diagram of a configuration apparatus for a secondary synchronization channel according to Embodiment 2 of the apparatus according to the present invention; Is a block diagram of a subcarrier mapping apparatus according to Embodiment 3 of the apparatus of the present invention;

13 is a flowchart of a method for transmitting a synchronization signal of a secondary synchronization channel according to Embodiment 3 of the method of the present invention;

Figure 14 is a block diagram of a synchronizing signal transmitting apparatus of a secondary synchronization channel according to a fourth embodiment of the apparatus of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The synchronization channel design scheme in the related art cannot clearly identify the cell ID information of different types of base stations, and cannot satisfy the expansion requirement of the Femto base station. The present invention proposes to use the sequence-pair orthogonal frequency division multiplexing in the sequence set. The information in the synchronization signal on the secondary synchronization channel in the system is mapped, and then the scheme of configuring and generating the synchronization signal can clearly identify the type and ID information of each base station, and can flexibly adapt to various changes of the base station, Helps optimize system performance.

2 is a structural diagram of P-SCH and S-SCH related to the present invention. Based on the frame structure shown in FIG. 1, as shown in part A of FIG. 2, P-SCH 201 and S-SCH 202 are respectively transmitted in a superframe, and P-SCH 201 is transmitted at the beginning of a 16m superframe, S -SCH 202 the second 16m single in the superframe The first symbol of the bit frame is sent. As shown in part B of Fig. 2, P-SCH 201 is transmitted once in the superframe, S-SCH 202 is transmitted twice in the superframe, P-SCH 201 is transmitted at the beginning of the 16m superframe, and S-SCH 202 is in The second 16m unit frame in the superframe and the first symbol of the fourth 16m unit frame are transmitted. As shown in part C of Figure 2, P-SCH 201 is transmitted once in the superframe, S-SCH 202 is transmitted three times in the superframe, P-SCH 201 is transmitted at the beginning of the 16m superframe, and S-SCH 202 is The first symbol of the second 16m unit frame, the third 16m unit frame, and the fourth 16m unit frame in the superframe is transmitted.

Based on the frame structure shown in Fig. 1 and the channel structure shown in Fig. 2, an embodiment of the present invention will be described in detail below.

Embodiment 1

In this embodiment, a method for configuring a secondary synchronization channel is provided for configuring a synchronization signal on an S-SCH in an orthogonal frequency division multiplexing system.

As shown in FIG. 3, the configuration method of the S-SCH according to this embodiment includes: Step S302 and Step S304. It should be noted that the steps described in the method may be performed in a computer system such as a set of computer executable instructions, and although the logical order is illustrated in FIG. 3, in some cases, may be different The steps shown or described are performed in the order herein.

The processing shown in Fig. 3 will be described below.

Step S302, configuring a first basic sequence set for indicating each combination of a cell ID and a sector ID carried by the S-SCH of the macro base station; and/or

Step S304, configuring a second basic sequence set for indicating each combination of the cell ID and the sector ID of the associated macro base station of the Femto base station, and a Femto base station ID sequence set for indicating the ID information of the Femto base station.

Specifically, the process of configuring the first basic sequence set may include: determining a first mapping relationship table between each combination of the cell ID and the sector ID carried by the S-SCH of the macro base station and the first basic sequence set sequence. After the first basic sequence set is configured, the actual cell ID can be obtained according to the macro base station. The combination with the actual sector ID and the first mapping relationship table finds the corresponding first sequence from the first basic sequence set as the synchronization sequence of the macro base station. For example, the information carried by the S-SCH of the macro base station is represented by a synchronization sequence (i.e., corresponding to the first sequence described above).

On the other hand, the information carried by the Femto base station S-SCH is carried by different sequence sets. Specifically, the process of configuring the second basic sequence set includes: determining a second mapping relationship table between each combination of the cell ID and the sector ID of the associated macro base station of the Femto base station and the second basic sequence set sequence, and determining the ID of the Femto base station. A third mapping table of information and a sequence of Femto base station ID sequence sets. After the second basic sequence set is configured, the corresponding second sequence may be searched from the second basic sequence set according to the combination of the actual cell ID and the actual sector ID of the macro base station to which the Femto base station belongs, and the second mapping relationship table, and And searching for a corresponding third sequence from the Femto base station ID sequence according to the actual ID information of the Femto base station and the third mapping relationship table. For example, the cell ID and sector ID information of the macro base station to which the Femto base station belongs is represented by the sequence corresponding to the second sequence described above. The Femto ID information of the Femto base station is represented by another Femto ID sequence set, that is, the sequence (corresponding to the above third sequence).

FIG. 4 is a schematic diagram showing the processing of generating a synchronization sequence of the Femto base station S-SCH in the S-SCH configuration method according to the present embodiment. As shown in FIG. 4, by combining the second sequence and the third sequence ^, that is, calculating y = ) 〇 ^ ( , the synchronization sequence y(n) of the S-SCH of the Femto base station can be obtained.

Preferably, the manner in which the second sequence and the third sequence are combined includes a dot product, a frequency division combination, and an interlace combination.

Preferably, the sequence in the basic sequence set and the sequence in the Femto base station ID sequence set include at least one of the following: a pseudo random sequence, a zero correlation sequence, an orthogonal sequence, a differential sequence of the pseudo random sequence, and a zero correlation sequence A differential sequence, a difference sequence of the orthogonal sequences.

Through the above processing, the type and ID information of each base station can be clearly identified, and the various changes of the base station can be flexibly adapted to help optimize the performance of the system. The processing of this embodiment will be described below with reference to specific examples.

FIG. 5 is a schematic diagram of a specific example of a cell packet according to an embodiment of the present invention. As shown in Figure 5, it is assumed that one system has 126 cell IDs, and the cell ID is divided into three groups: i=0, 1 , 2, 42 in each group, ID j=0~41 in the group, and each cell is divided into 3 Sectors: k=0, 1 , 2.

The information carried by the S-SCH of the macro base station is cell ID and sector ID information. Femto base station

The information carried by the S-SCH is the cell ID and sector ID information of the home macro base station and the Femto ID information. The information carried by the S-SCH of the macro base station is represented by a basic sequence set, that is, the synchronization sequence ^.

In order to facilitate the search, a mapping relationship between the Cell ID and the sector ID carried by the S-SCH of the macro base station and the sequence number of the S-SCH basic sequence set sequence (corresponding to the first mapping relationship table) may be defined in advance, based on FIG. The cell grouping, the mapping relationship table is shown in Table 1.

Table 1

From the Cell ID and the sector ID, the sequence corresponding to the sequence number of the basic sequence set (corresponding to the first sequence described) is found from Table 1 as the synchronization sequence of the macro base station.

The S-SCH sequence of the macro base station ^ ^ is a sequence of length L = 432 / 3 = 144, different sectors

The S-SCH sequence has 3 different sets of 144 sub-carriers on the available subcarriers ¹ ^^^ Carrier position mapping, no subcarriers are set to zero. FIG. 6 is a schematic diagram of processing of subcarrier mapping according to an embodiment of the present invention. As shown in Figure 6, the mapping is as follows:

x(n) = x(3u + k), k = 0,\,2.u = 0,1,2,...

When the terminal accesses the macro base station, the following processing is performed:

Detecting the P-SCH, determining whether it is a macro base station (cell) according to the control information carried by the P-SCH; if it is a macro base station, detecting, obtaining the cell ID and the sector ID;

For a Femto base station, the information carried by the S-SCH contains different sequence sets. The cell ID and sector ID information of the macro base station to which the Femto base station belongs is represented by a basic sequence set, that is, a sequence. The Femto ID information of the Femto base station is represented by another Femto ID sequence set, that is, a sequence representation. Pre-defining the mapping relationship between the belonging Cell ID and the sector ID and the sequence number of the S-SCH basic sequence set, as shown in Table 1, defining a mapping relationship table between the Femto ID information and the Femto ID sequence set, as shown in Table 2. .

According to the Cell ID and the sector ID, find the sequence corresponding to the sequence number in the basic sequence set from Table 1. According to the Femto ID, find the sequence corresponding to the sequence number of the Femto ID sequence set in Table 2;

The synchronization sequence y of the Femto base station S-SCH is generated by the sequence and sequence dot product.

The S-SCH sequence y( ^w ) of the Femto base station is a sequence with a length of L=432/3=144 and a dot product, that is, the processing shown in FIG. 4, the sequence is an intra-cell ID sequence, and carries a Femto ID.

The S-SCH sequence of the Femto base stations located in different sectors is on the available subcarriers ^Ν ^=432 The three groups of different 144 subcarrier positions on the subcarriers are mapped, and the subcarriers are not set to zero. As shown in Figure 6, the subcarriers are mapped as follows:

y(n) = y(3u + k), k = 0,1,2." = 0,1,2".. where _k is the sector number. The process of the terminal accessing the Femto base station includes the following steps:

Detecting the P-SCH, determining whether it is a Femto base station according to the control information carried by the P-SCH; if it is a Femto base station, detecting and "), obtaining the cell ID and the sector ID, and the Femto ID;

The subcarrier mapping of the S-SCH sequence can also take the mapping mode shown in FIG.

FIG. 7 is a schematic diagram of a carrier mapping method according to an embodiment of the present invention. As shown in FIG. 7, in the carrier mapping method according to an embodiment of the present invention, subcarriers of three sectors are mapped to a portion where the subcarrier number is less than 432/2=216, according to y( ⁿ ) = ^ ^3u + ^k ), ^k = °^ ^2m =. , ¹ , ² , ... way to map.

When the subcarriers of the three sectors are mapped in a portion where the subcarrier number is greater than 432/2=216, the first sector S-SCH is mapped to the original second sector subcarrier position, and the second sector S-SCH is mapped to The original third sector subcarrier position, the third sector S-SCH is mapped to the original first sector subcarrier position, as shown in the following mathematical expression:

y(n) = y(3u + mod( k + round(3u/( L/2) ))J, k = 0,1,2.« = 0,1,2,...

Where mod is the remainder operation and round is the rounding operation.

FIG. 8 is a flowchart of processing performed by a terminal to perform cell search according to an embodiment of the present invention. As shown in FIG. 8, after the synchronization signaling of the secondary synchronization channel is configured by the foregoing processing, when the terminal performs the cell search, the following specifically includes the following processing:

The terminal obtains the base station type by using the base station type information carried by the primary synchronization channel (P-SCH); if it is a macro base station, step 82 is performed; if it is a Femto base station, step 84 is performed; step 82, detecting the sequence carried by the S-SCH, And performing step 83;

Step 83: Obtain a Cell ID and a sector ID information of the macro base station according to the mapping relationship table 1; Step 84: The terminal detects the sequence and the sequence of the ^^ carried by the S-SCH, and performs step 85; Step 85, according to the mapping relationship table 1 and Table 2, obtain the Cell ID, the sector ID, and the macro ID of the macro base station to which the Femto base station belongs. Femto ID information.

Through the above processing, the type and ID information of each base station can be clearly identified, and the various changes of the base station can be flexibly adapted to help optimize the performance of the system.

Embodiment 2

In this embodiment, a secondary synchronization channel configuration apparatus is provided for configuring a synchronization signal on a secondary synchronization channel in an orthogonal frequency division multiplexing system.

As shown in FIG. 9, the apparatus for configuring a secondary synchronization channel according to the present embodiment includes: a first configuration module 92 and a second configuration module 94.

The functions of each module in Figure 9 are as follows:

a first configuration module 92, configured to configure a first basic sequence set for indicating each combination of a cell ID and a sector ID carried by the S-SCH of the macro base station; and/or

a second configuration module 94, configured to configure a second sequence set for indicating each combination of a cell ID and a sector ID of the associated macro base station of the Femto base station, and a Femto base station ID sequence set for indicating ID information of the Femto base station .

The apparatus according to the present embodiment can perform the synchronization signal of the secondary synchronization channel configured in the processing shown in FIG. 3 and FIG. 4 in the case of the cell partition shown in FIG. 5, and the processing thereof is not repeated here.

With the apparatus according to the present embodiment, the type and ID information of each base station can be clearly identified, and the various changes of the base station can be flexibly adapted to help optimize the performance of the system.

Embodiment 3

As shown in FIG. 10, the method for configuring the secondary synchronization channel according to the present embodiment includes step S1002 and step S1004. The process shown in Figure 10 is as follows:

Step S1002: The cell ID information carried in the synchronization signal is divided into multiple ID subsets according to system configuration information.

Step S1004: For each ID subset, configure a type sequence set for indicating its type, and a basic sequence set for indicating the IDs in its subset.

That is to say, each of the above ID subsets is represented by a combination of two different sequence sets, one sequence is a basic sequence set, which represents a cell ID in the subset, and the other is a type sequence set, and the type sequence is a subset identifier. Used for zone molecular sets.

The system configuration information includes base station type information and/or multi-carrier configuration information, where the base station type includes a macro base station, and/or a Femto base station, and/or a relay base station, and the multi-carrier configuration includes a fully configured carrier and/or a partial configuration. Carrier.

And, the divided plurality of ID subsets include at least one of the following: a macro base station cell ID subset, a Femto base station cell ID subset, and a relay base station cell ID subset.

At this time, the processing of configuring the sequence set and the basic sequence set includes at least one of the following: For the macro base station cell ID subset, the cell ID therein is divided into packet information, a cell ID in the packet, and a sector ID in the packet. Information, and the type sequence of the configured type sequence set respectively represents the fully configured carrier, the partial configuration carrier, and the cell ID packet number, and the basic sequence of the configured basic sequence set represents the cell ID information within the packet and the sector within the packet Various combinations of ID information;

For the Femto base station cell ID subset, the Femto base station cell is represented by the type sequence of the configured type sequence set, and the Femto base station cell ID information is represented by the basic sequence of the configured basic sequence set;

For the relay base station cell ID subset, the relay base station is represented by the type sequence of the configured type sequence set, and the relay base station ID information is represented by the basic sequence of the configured basic sequence set.

After configuring the type sequence set and the base sequence set, the method may further include the following At least one of the following:

For the macro base station, the corresponding basic sequence is selected from the configured basic sequence set according to the combination of the actual cell ID and the sector ID, and the selected basic sequence is combined with the type sequence corresponding to the macro base station in the type sequence set to obtain the S- of the macro base station. Synchronization sequence of SCH;

For the Femto base station, the corresponding basic sequence is selected according to the actual Femto base station cell ID from the configured basic sequence set, and the selected basic sequence is combined with the type sequence corresponding to the Femto base station in the type sequence set to obtain the S-SCH synchronization sequence of the Femto base station. ;

For the relay base station, the corresponding basic sequence is selected according to the actual relay base station cell ID from the configured basic sequence set, and the selected basic sequence is combined with the type sequence corresponding to the type sequence centralized relay base station to obtain the S- of the relay base station. The synchronization sequence of the SCH.

Preferably, the sequence in the basic sequence set and the sequence in the type sequence set include at least one of: a pseudo random sequence, a zero correlation sequence, an orthogonal sequence, a differential sequence of the pseudo random sequence, a difference sequence of the zero correlation sequence, A sequence of differences of the orthogonal sequences.

Preferably, according to the foregoing system configuration information classification, the division of the subset of cell IDs is divided into a macro cell ID subset (including a fully configured carrier and a partially configured carrier), a Femto cell ID subset, a Relay ID subset, and an extension. Reserved ID subsets, etc.

For the configuration of each mapping table, the processing is as follows:

Pre-defining the mapping relationship between the Cell ID group information and/or the base station type and/or the multi-carrier information and the corresponding sequence number in the type sequence set, as shown in Table 3, the number of Cell ID packets in the table is > 1 , if the number of Cell ID packets is equal to 1 means that the system does not perform Cell ID grouping. At this time, the Cell ID in the packet is the Cell ID. The mapping relationship between the Cell ID (or the Cell ID in the group) and the sector information and the corresponding sequence number in the basic sequence set is as shown in Table 1. The mapping relationship between the Femto ID and the corresponding sequence number in the basic sequence set is shown in Table 4. Relay ID and sequence sequence corresponding to the basic sequence set The mapping table of numbers, as shown in Table 5.

Relay ID S-SCH basic sequence set sequence

Column number j

0 0

1 1

twenty two

3 3

L L

table 5

And, based on the Cell ID packet information and/or the base station type and/or the multi-carrier information, the sequence m(i) corresponding to the type sequence set can be found from the mapping table 3.

For the macro base station, according to the Cell ID and the sector ID, the sequence corresponding to the sequence number of the basic sequence set can be found from the mapping relationship table 1. For the Femto base station, according to the Femto ID, the basic sequence set can be found from the mapping relationship table 4. The sequence corresponding to the sequence number P« ; For the Relay station, according to the Relay lD, the sequence P corresponding to the sequence number of the basic sequence set can be found from the mapping relationship table 5 (0. The synchronization sequence S of the S-SCH is composed of the sequence m(i) and the sequence P (0 point product operation is as follows: S = m(i) Q p( ).

Embodiment 4

In this embodiment, a secondary synchronization channel configuration apparatus is provided for configuring a synchronization signal on an S-SCH in an orthogonal frequency division multiplexing system.

As shown in FIG. 11, the apparatus for configuring a secondary synchronization channel according to this embodiment includes: a division module 112, a first configuration module 114, and a second configuration module 116.

The functions of each module in Figure 11 are as follows:

The dividing module 112 is configured to divide the cell ID information carried in the synchronization signal into multiple ID subsets according to system configuration information;

The first configuration module 114 is connected to the dividing module 112, configured to configure, for each ID subset, a type sequence set for indicating a corresponding ID subset type;

The second configuration module 116 is coupled to the partitioning module 112 for configuring, for each ID sub-section, a basic sequence set for indicating IDs within the subset of the corresponding ID subset.

The device can also perform synchronous signaling configuration of the secondary synchronization channel based on the mapping relationship shown in Table 1, Table 3, Table 4, and Table 5. The processing procedure is not repeated here.

Embodiment 5

In this embodiment, a seed carrier mapping apparatus is provided for mapping a synchronization sequence of an S-SCH in an orthogonal frequency division multiplexing system to a subcarrier, where the number of useful subcarriers is L.

As shown in FIG. 12, the subcarrier mapping apparatus according to the present embodiment includes a first mapping module 122 and a second mapping module 124.

The functions of each module in Figure 12 are as follows:

The first mapping module 122 is configured to perform subcarrier mapping of different sectors on subcarriers whose subcarrier numbers are less than L/2 according to the following formula: x(n) = x(3u + k), k = 0,1,2. u = 0,1,2,...

Where k is the sector number and u is the element number in the sequence;

The second mapping module 124 is configured to perform subcarrier mapping of different sectors on the subcarriers whose subcarrier numbers are greater than L/2 according to the following formula:

y(n) = y(3u + mod(k + round((3u+ 1 /(172) ), k = 0,1,2. u = 0,1,2".. ,

Where mod is the remainder operation and round is the rounding operation.

The apparatus can perform subcarrier mapping according to the mapping manner shown in Fig. 7, thereby realizing the transmission of the synchronization signal of the secondary synchronization channel.

Embodiment 6

In this embodiment, a synchronization signal transmission method for a secondary synchronization channel is provided for transmitting a secondary synchronization sequence of a synchronization signal of an orthogonal frequency division multiplexing system.

As shown in FIG. 13, the synchronization signal transmitting method of the secondary synchronization channel according to the present embodiment includes step S1302 and step S1304.

The specific processing shown in Figure 13 is as follows:

Step S1302: According to the requirement of the system for the secondary synchronization sequence, for the system with the basic bandwidth, the secondary synchronization sequence is configured to be x = 2 ⁿ + c , where X is the length of the secondary synchronization sequence, and 2 ^{n is} less than or equal to the system requirement. The length of the secondary synchronization sequence; for a system whose system bandwidth is a multiple of the base bandwidth m, the secondary synchronization sequence is configured as x = mx 2 ⁿ + c , where m is a multiple;

Step S1304: The configured secondary synchronization sequence is transmitted by using an antenna of the transmitting end.

With the method according to the present embodiment, the transmission of the secondary synchronization sequence can be achieved.

Example 7

In this embodiment, a synchronization signal transmitting apparatus for a secondary synchronization channel is provided for transmitting a secondary synchronization sequence of a synchronization signal of an orthogonal frequency division multiplexing system.

As shown in FIG. 14, the synchronization signal transmitting apparatus of the secondary synchronization channel according to the present embodiment includes: a configuration module 142 and a transmitting module 144. The configuration module 142 is configured to configure the secondary synchronization sequence to be x = 2 ⁿ + c for the system of the basic bandwidth according to the requirements of the system for the secondary synchronization sequence, where X is the length of the secondary synchronization sequence, and 2 ^{n is} less than or equal to the system. The length of the required secondary synchronization sequence; for systems where the system bandwidth is a multiple of the base bandwidth m, and for configuring the secondary synchronization sequence to be x = mx 2 ⁿ + c, where m is a multiple;

The transmitting module 144 is connected to the configuration module 142 for transmitting the configured secondary synchronization sequence through the antenna.

With the apparatus according to the present embodiment, the transmission of the secondary synchronization sequence can be realized.

In summary, with the above technical solution of the present invention, the information in the synchronization signal on the secondary synchronization channel in the orthogonal frequency division multiplexing system is mapped and the synchronization signal is generated by the sequence in the sequence set, thereby solving the related art. The synchronization channel design scheme cannot clearly identify the cell ID information of different types of base stations and the problem that the Femto base station cannot meet the expansion requirements, and can clearly identify the type and ID information of each base station, and can flexibly adapt to each base station. The changes can help optimize the performance of the system and meet the fast access requirements of the terminal in the scenario where a large number of Femto base stations are deployed.

Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Claim

A method for configuring a secondary synchronization channel, configured to configure a synchronization signal on a secondary synchronization channel in an orthogonal frequency division multiplexing system, wherein the method includes:

Configuring a first basic sequence set for indicating a combination of a cell ID and a sector ID carried by the secondary synchronization channel of the macro base station; and/or

And configuring a second basic sequence set for indicating each combination of a cell ID and a sector ID of the associated macro base station of the home base station, and a home base station ID sequence set for indicating the ID information of the home base station.

The method according to claim 1, wherein the processing of configuring the first basic sequence set comprises:

Determining a first mapping relationship table between each combination of a cell ID and a sector ID carried by the secondary synchronization channel of the macro base station and the first basic sequence set sequence.

The method according to claim 2, after the configuring the first basic sequence set, further comprising:

And searching, according to the combination of the actual cell ID and the actual sector ID of the macro base station, and the first mapping relationship table, the corresponding first sequence from the first basic sequence set as the synchronization sequence of the macro base station.

The method according to claim 1, wherein the processing of configuring the second basic sequence set comprises:

Determining a second mapping relationship table of each combination of the cell ID and the sector ID of the associated macro base station of the home base station and the second basic sequence set sequence, and determining the ID information of the home base station and the third sequence of the home base station ID sequence sequence Mapping relational tables.

The method according to claim 4, after the configuring the second basic sequence set, further comprising:

According to the combination of the actual cell ID and the actual sector ID of the macro base station to which the home base station belongs, And the second mapping relationship table, searching for a corresponding second sequence from the second basic sequence set; and, according to the actual ID information of the home base station and the third mapping relationship table, from the home base station ID sequence The corresponding third sequence is collectively searched, and the second sequence and the third sequence are combined to obtain a synchronization sequence of the home base station.

The method according to claim 5, wherein the manner of combining the second sequence and the third sequence comprises at least one of the following: a dot product, a frequency division combination, and an interlace combination.

The method according to any one of claims 1 to 6, wherein the sequence of the first basic sequence set, the second basic sequence set, and the home base station ID sequence set includes at least one of the following : a pseudo random sequence, a zero correlation sequence, an orthogonal sequence, a differential sequence of the pseudo random sequence, a differential sequence of the zero correlation sequence, and a difference sequence of the orthogonal sequence.

Dividing the cell ID information carried in the synchronization signal into multiple ID subsets according to system configuration information;

For each subset of IDs, configure a type sequence set that represents its type, and a basic sequence set that is used to represent ID information within its subset.

The method according to claim 8, wherein the system configuration information comprises base station type information and/or multi-carrier configuration information, wherein the base station type comprises a macro base station, and/or a home base station, and/or Following the base station, the multi-carrier configuration includes a fully configured carrier and/or a partially configured carrier.

The method according to claim 9, wherein the divided plurality of ID subsets comprise at least one of: a macro base station cell ID subset, a home base station cell ID subset, and a relay base station cell ID. Subset.

The method according to claim 10, wherein the type sequence set and the basic sequence set are configured, including at least one of the following: For the macro base station cell ID subset, the cell ID therein is divided into group information, a cell ID in the packet, and sector ID information in the packet, and the type sequence of the type sequence set is respectively configured to represent the whole Configuring a carrier, a partial configuration carrier, and a cell ID packet number, and indicating, by configuring a basic sequence of the basic sequence set, cell ID information within the packet and various combinations of sector ID information within the packet;

For the home base station cell ID subset, the type sequence sequence of the type sequence set is configured to represent the home base station cell, and the basic sequence of the basic sequence set is configured to represent the home base station cell ID information;

For the relay base station cell ID subset, the relay base station is represented by the configured type sequence of the type sequence set, and the relay base station ID information is represented by the configured basic sequence of the basic sequence set.

The method according to claim 11, wherein after configuring the type sequence set and the basic sequence set, further comprising at least one of the following processes:

For the macro base station, selecting a corresponding basic sequence from the configured basic sequence set according to the combination of the actual cell ID and the sector ID, and combining the selected basic sequence with the type sequence corresponding to the macro base station in the type sequence set to obtain a a synchronization sequence of the secondary synchronization channel of the macro base station; for the home base station, selecting a corresponding basic sequence from the configured basic sequence set according to the actual home base station cell ID, and concentrating the selected basic sequence and the type sequence on the home base station Corresponding type sequence combination to obtain a synchronization sequence of the secondary synchronization channel of the home base station;

For the relay base station, selecting a corresponding basic sequence from the configured basic sequence set according to the actual relay base station cell ID, and combining the selected basic sequence with the type sequence corresponding to the relay base station in the type sequence set to obtain the A synchronization sequence of the secondary synchronization channel of the relay base station.

The method according to any one of claims 8 to 12, wherein the sequence in the basic sequence set and the sequence in the type sequence set include at least one of the following: a pseudo random sequence, a zero correlation sequence, and a positive a sequence of intersections, a sequence of differences of the pseudo-random sequences, and a sequence of zero correlations A differential sequence, a difference sequence of the orthogonal sequences.

A subcarrier mapping method, configured to map a synchronization sequence of a secondary synchronization channel in an orthogonal frequency division multiplexing system to a subcarrier, wherein the method includes:

In the case where the number of useful subcarriers is L, for subcarriers whose subcarrier numbers are smaller than L/2, subcarrier mapping of different sectors is performed according to the following formula:

x(n) = x(3u + k), k = 0,1,2. u = 0,1,2,... , where k is the sector number and u is the element number in the sequence;

y(n) = y(3u + mod(k + round(3u/^/2))), ), k = 0,1,2. M = 0,1,2,... ,

Where mod is the remainder operation and round is the rounding operation.

A device for configuring a secondary synchronization channel, configured to configure a synchronization signal on a secondary synchronization channel in an orthogonal frequency division multiplexing system, wherein the apparatus includes:

a first configuration module, configured to configure a first basic sequence set for indicating each combination of a cell ID and a sector ID carried by the secondary synchronization channel of the macro base station; and/or

a second configuration module, configured to configure a second basic sequence set for indicating each combination of a cell ID and a sector ID of the associated macro base station of the home base station, and a home base station ID sequence for indicating ID information of the home base station set.

16. A device for configuring a secondary synchronization channel, configured to configure a synchronization signal on a secondary synchronization channel in an orthogonal frequency division multiplexing system, wherein the device includes:

a dividing module, configured to divide the cell ID information carried in the synchronization signal into multiple ID subsets according to system configuration information;

a first configuration module, configured to configure, for each ID subset, a type sequence set for indicating a corresponding ID subset type;

a second configuration module, configured to configure each of the ID sub-children to represent a sub-set of the corresponding ID The basic sequence set of the set ID information.

17. The seed carrier mapping device, configured to map the synchronization sequence of the secondary synchronization channel in the orthogonal frequency division multiplexing system to the subcarrier, wherein the number of useful subcarriers is L, wherein the apparatus comprises:

a first mapping module, configured to perform subcarrier mapping of different sectors on subcarriers whose subcarrier numbers are less than L/2 according to the following formula:

y(n) = y(3u + mod(k + round(3u/(L/2))), ), k = 0,1,2. w = 0,1,2,..., where mod is taken For the remainder operation, round is the rounding operation.

18. A synchronization signal transmission method for a secondary synchronization channel, a secondary synchronization sequence for transmitting a synchronization signal of an orthogonal frequency division multiplexing system, wherein the method comprises:

According to the requirements of the system for the secondary synchronization sequence, for the system with the basic bandwidth, the secondary synchronization sequence is configured as x = 2 ⁿ + c, where X is the length of the secondary synchronization sequence, and 2 ^{n is} less than or equal to the secondary synchronization sequence required by the system. length; basis for system bandwidth of the system bandwidth is a multiple of m, the secondary synchronization sequence is configured to x = mx 2 ⁿ + c;

The configured secondary synchronization sequence is transmitted through an antenna of the transmitting end.

A synchronization signal transmitting apparatus for a secondary synchronization channel, a secondary synchronization sequence for transmitting a synchronization signal of an orthogonal frequency division multiplexing system, wherein the apparatus comprises:

The configuration module is configured to configure the secondary synchronization sequence to be x = 2 ⁿ + c for the system of the basic bandwidth according to the requirements of the system for the secondary synchronization sequence, where X is the length of the secondary synchronization sequence, and 2 ^{n is} less than or equal to the system requirement. The length of the secondary synchronization sequence; for a system whose system bandwidth is a multiple of the base bandwidth m, the secondary synchronization sequence is configured as x = mx 2 ⁿ + c; And a transmitting module, configured to transmit, by using an antenna, the secondary synchronization sequence after being configured.