Data generation apparatus, data generation method, base station, mobile station, synchronization detection method, sector identification method, information detection method and mobile communication system

a data generation and data technology, applied in the field of data generation apparatus, can solve the problems of not being able to completely shift from 3g to 4g, and achieve the effects of reducing the memory capacity, enhancing anti-fading characteristics, and eliminating interference between sectors

Inactive Publication Date: 2009-10-15
SHITARA SHOICHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0083]According to the invention, by a sector common code being multiplied by a sector specific code, it is possible to identify a sector only by despreading and correlation detection using the SCH without using a pilot channel. Accordingly, with respect to sector identification, the need is eliminated for despreading and correlation detection processing using a pilot channel, and it is possible to reduce the capacity of memory to be used in correlation calculation using the pilot channel.
[0084]Further, since the SCH is multiplied by the sector specific code, it is possible to eliminate interference between sectors even in a boundary of the sectors.
[0085]Furthermore, it is possible to obtain the effect of enhancing anti-fading characteristics by randomizing effect produced by code multiplication. It is easy to increase the number of sector specific codes (orthogonal codes) assigned for each sector according to an increase in the number of sectors, and to respond to the sector configuration flexibly.
[0086]Moreover, when the number of subcarriers of the SCH is adequate (to multiply by the cell specific code of the SCH), it is also possible to directly identify a cell ID only by the SCH. In this case, the cell search processing including sector identification is completed by 2-step processing using only the SCH (2-step cell search), and the search time can be reduced as compared with the conventional 3-step cell search.
[0087]Further, by devising structures, contents and arrangements on the frequency axis of a cell specific code and sector specific code to multiply, it is possible to prevent the sector specific code and cell specific code from imposing an adverse effect on each other, and to suppress a decrease in information transmission accuracy. Furthermore, each information can be demodulated independently (i.e. in parallel processing). By this means, it is possible to reduce the processing time of a cell search including a sector search.
[0088]In other words, a 2m-chip code is generated by combining two orthogonal m-chip codes, the m-chip code is used for sector identification, the other m-chip code is used for identification of cell specific information, and further, the cell specific information is transmitted as phase difference information between subcarriers (that are more preferably adjoined on the frequency axis) multiplied by a sector specific code element of the same value. It is thereby possible to efficiently transmit the sector specific information and cell specific information, while the receiving side can divide and extract both of the information with efficiency.

Problems solved by technology

However, it is not easy to completely shift from 3G to 4G.

Method used

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  • Data generation apparatus, data generation method, base station, mobile station, synchronization detection method, sector identification method, information detection method and mobile communication system
  • Data generation apparatus, data generation method, base station, mobile station, synchronization detection method, sector identification method, information detection method and mobile communication system
  • Data generation apparatus, data generation method, base station, mobile station, synchronization detection method, sector identification method, information detection method and mobile communication system

Examples

Experimental program
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embodiment 1

[0171]Embodiment 1 describes a cell search method according to the invention. FIG. 1 is a flowchart showing an example of main procedures of multicarrier transmission processing according to the invention. As shown in the figure, a base station in a multicarrier mobile communication system adopting an OFDM communication scheme multiplies three kinds of code to generate a synchronization channel (SCH) included on downlink. In other words, the base station multiplies a “sector common code common in the same cell” by a “sector specific code (orthogonal code varying with sectors in the same cell)”, and a “cell specific code (code varying with cells to transmit cell specific information)” (step S1). The sector common code may be a common code in a plurality of cells.

[0172]Next, by assignment (mapping) in the time / frequency plane, the SCH and pilot channel are assigned to subcarriers of a resource block (step S2). Then, multiplication of spreading code and IFFT processing is executed (ste...

embodiment 2

[0196]This Embodiment describes a data structure of the SCH and a cell search method including sector identification, using the case where the SCH is arranged at the end of a sub-frame, as an example.

[0197]A cellular system is a mobile communication system comprised of a plurality of cells, and a cellular system used in this Embodiment is a one-cell reuse communication system in which each cell uses the same frequency band, and an OFDMA communication scheme is used as a communication scheme. As shown in FIG. 23, in this communication system, a cell is divided into three communication areas (sectors), and a base station located in the center of the cell performs wireless communication with mobile stations positioned in a plurality of sectors. The same frequency band is used in each sector, a pilot channel is multiplied by an orthogonal code specific to the sector, and by using despreading, accurate propagation path estimation can be made even near the sector boundary.

[0198]A downlink...

embodiment 3

[0253]Embodiment 3 of the invention will be described below. In Embodiment 2 shown above, the SCH is inserted for each frame (FIG. 24), and therefore, a null subcarrier is set every two subcarriers (FIG. 25).

[0254]In this Embodiment, as shown in FIG. 16, subcarriers except a subcarrier (DC subcarrier) in the center of the band are SCH subcarriers. Further, as an arrangement of SCH symbols in a frame shown in FIG. 19, the same SCH symbols are arranged in two consecutive symbols in a specific temporal position in the frame. FIG. 19 is a diagram illustrating a frame structure in Embodiment 3.

[0255]In other words, in this Embodiment, as compared with Embodiment 2 shown above, the number of SCH subcarriers is twice, and the code length usable in the cell specific information is increased. Accordingly, it is possible to transmit and receive a SCH signal with a larger information amount.

[0256]FIG. 16 is a diagram showing subcarriers assigned the SCH. In this Embodiment, the SCH is configur...

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Abstract

To reduce the process of a cell search including sector identification without increasing loads on a transmission / reception apparatus. A synchronization channel (SCH) included on downlink in a multicarrier mobile communication system is multiplied by a sector specific code and a cell specific code (step S1), assigned to subcarriers on the frequency axis (step S2), subjected to spreading processing and IFFT processing (steps S3, S4), and further subjected to insertion of GI and D / A conversion processing (steps S5, S6), and multicarrier is transmitted from a directional antenna of each sector (step S7). The receiving side specifies a SCH position by auto-correlation method or cross-correlation method, performs FFT, and then, concurrently performs identification of a sector by detection of the sector specific code, and acquisition of cell specific information by demodulation of the cell specific code.

Description

[0001]This application is a Divisional application of U.S. application Ser. No. 12 / 303,696 filed on Dec. 5, 2008. Application Ser. No. 12 / 303,696 is the National Phase of PCT International Application No. PCT / JP2007 / 062243 filed on Jun. 18, 2007, and claims priority under 35 U.S.C. § 119(a) to Patent Application No. 2006-168168 filed in Japan on Jun. 16, 2006, and 2006-212658 filed in Japan on Aug. 3, 2006, all of which are hereby expressly incorporated by reference into the present application.TECHNICAL FIELD[0002]The present invention relates to mobile communication of the E-UTRA (Evolved-UTRA) standard adopting a multicarrier communication scheme, and more particularly to a data generation apparatus, data generation method, base station, mobile station, synchronization detection method, sector identification method, information detection method and mobile communication system for generating data of a synchronization channel (SCH) included in a downlink (transmission) signal.BACKG...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04J3/06H04J11/00H04W48/10H04W48/16H04W56/00H04W64/00
CPCH04J11/0069H04J11/0076H04L5/005H04L5/0053H04L27/2655H04W8/005H04W28/06H04W48/08H04W64/00H04W88/08H04L27/2613H04L27/2675H04J11/0079H04J11/0073H04L5/0023
Inventor SHITARA, SHOICHI
Owner SHITARA SHOICHI
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