WO2009116270A1 - 無線通信装置、無線通信方法および無線通信システム - Google Patents
無線通信装置、無線通信方法および無線通信システム Download PDFInfo
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- WO2009116270A1 WO2009116270A1 PCT/JP2009/001183 JP2009001183W WO2009116270A1 WO 2009116270 A1 WO2009116270 A1 WO 2009116270A1 JP 2009001183 W JP2009001183 W JP 2009001183W WO 2009116270 A1 WO2009116270 A1 WO 2009116270A1
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- centralized control
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- distributed control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/70735—Code identification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7083—Cell search, e.g. using a three-step approach
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Definitions
- the present invention relates to a wireless communication apparatus, a wireless communication method, and a wireless communication system that relay communication between a base station and a mobile station.
- a base station the coverage area of the radio communication base station apparatus (hereinafter referred to as a base station) becomes smaller, and thus more base stations Needs to be set up. Since installation of a base station requires a considerable cost, there is a strong demand for a technology for realizing a communication service using a high frequency radio band while suppressing an increase in the number of base stations.
- each base station 5 In order to expand the coverage area of each base station in response to such a request, as shown in FIG. 1, between the base station 5 and the radio communication mobile station apparatuses 3 and 4 (hereinafter referred to as mobile stations).
- Relay transmission technology in which wireless communication relay station apparatuses 1 and 2 (hereinafter referred to as relay stations) are installed and communication between the base station 5 and mobile stations 3 and 4 is performed via the relay stations 1 and 2 It is being considered. If relay technology is used, terminals 3 and 4 that can not directly communicate with base station 5 can also communicate via relay stations 1 and 2.
- the base station 5 manages all the resources between the base station 5 and the relay stations 1 and 2, between the relay stations 1 and 2 and the mobile stations 3 and 4, and the base station 5 generates control information, It is a control method to allocate.
- the autonomous distributed control manages the resources of the mobile station 3 connected to the relay station 1 by the relay station 1 and the resources of the mobile station 4 connected to the relay station 2 by the relay station 2, and the relay stations 1 and 2 generate control information Control method to assign.
- the centralized control can flexibly change the allocation amount in accordance with the change in traffic for each of the relay stations 1 and 2.
- centralized control can easily realize cooperative relaying in which a plurality of relay stations 1 and 2 relay simultaneously.
- distributed control the allocation amount can be changed in accordance with fluctuations in instantaneous signal-to-interference plus noise power Raito (SINR) between relay stations 1 and 2 to mobile stations 3 and 4.
- SINR instantaneous signal-to-interference plus noise power Raito
- distributed control can reduce the scheduling load of the base station 5.
- Non-Patent Document 1 proposes that a centralized control system and a distributed control system coexist.
- the base station schedules all resources, they all appear to the same cell from the viewpoint of the mobile station. Therefore, although centralized control can easily cope with changes in traffic for each relay station and has the advantage of being able to perform cooperative relay, the scheduling load of the base station becomes high.
- distributed control since distributed control is scheduled by the relay station with respect to the mobile station in the relay station, the mobile station sees all different cells. For this reason, distributed control can cope with instantaneous SINR and has an advantage of reducing the scheduling load of the base station, but cooperative relay is difficult and it is difficult to cope with changes in traffic for each relay station.
- Non-Patent Document 1 discloses a technique for performing centralized control or distributed control for each of the relay stations 1 and 2, centralized control and distributed control can not be simultaneously performed by one relay station. Furthermore, although mobile stations suitable for centralized control and mobile stations suitable for distributed control exist for each mobile station, they can not be used properly.
- both the centrally controlled resource (centralized control resource) and the distributed control resource (distributed control resource) are set, and they are respectively different cells. It is conceivable to make the mobile stations 3 and 4 recognize.
- the present invention has been made in view of the above-described conventional circumstances, and is capable of selectively utilizing the advantages of both centralized control and decentralized control while suppressing the time required for cell search.
- the object is to provide a wireless communication system.
- the present invention relates to a relay station for relaying centrally controlled resources (centralized control resources) and distributedly controlled resources (distributed control resources), the relay station includes P-BCH and S-SCH for centralized control, and distributed control. P-BCH and S-SCH for transmission, and P-SCH for central control resources.
- the band for transmitting the P-SCH can be reduced.
- the band for searching for the P-SCH can be limited to the centralized control resource.
- P-BCH and S-SCH for centralized control resources and P-BCH and S-SCH for distributed control resources Respectively transmit to the centralized control resource and the distributed control resource.
- P-BCH and S-SCH for centralized control resources and P-BCH and S-SCH for distributed control resources are all transmitted to frequency resources to be centrally controlled and divided by time resources. .
- resources to be received at the time of cell search can be limited to centralized control frequency resources.
- the scrambling code used in S-SCH for distributed control is a scrambling code used in S-SCH for centralized control and a resource to which S-SCH for distributed control is transmitted.
- the index ⁇ indicating how far apart the resources to which the S-SCH for centralized control is transmitted are separated.
- the P-BCH and S-SCH for centralized control are used even when the distributed control resource is allocated. Periodically.
- the radio communication apparatus of the present invention performs symbol synchronization with the base station using P-SCH at the time of cell search, performs frame synchronization using S-SCH, and receives / demodulates / decodes P-BCH.
- a radio communication apparatus that relays communication with a mobile station that performs communication using a centralized control resource and a distributed control resource, wherein P-BCH, S-SCH and P-SCH for centralized control are used as the centralized control resource. Transmit and transmit P-BCH and S-SCH for distributed control to the distributed control resource.
- the centralized control P-BCH and S-SCH are transmitted to the centralized control resource.
- the P-BCH and S-SCH for distributed control are transmitted to the distributed control resource.
- the P-BCH and S-SCH for centralized control and the P- for distributed control are provided.
- the BCH and S-SCH are time-divided to the centralized control resource and transmitted.
- resources to be received at the time of cell search can be limited to centralized control frequency resources.
- resources to be received at the time of cell search can be limited to centralized control frequency resources.
- the scrambling code used in the distributed control S-SCH, the scrambling code used in the centralized control S-SCH, and the distributed control S-SCH It is calculated from an indicator ⁇ indicating how far apart the resource to be transmitted is from the resource to which the S-SCH for central control is to be transmitted.
- the wireless communication device when the centralized control resource and the distributed control resource are divided by time, which of the distributed control resource and the centralized control resource is allocated time? Regardless, the P-BCH and S-SCH for centralized control are periodically transmitted.
- P-SCH, S-SCH, RS, and P-BCH for centralized control are transmitted periodically, even when centralized control resources are allocated on the time axis, P for centralized control can be used. Since it is possible to periodically receive BCH, S-SCH, and P-BCH, the mobile station performing cell search can easily perform correlation calculation.
- symbol synchronization is performed with the base station using P-SCH at the time of cell search, frame synchronization is performed using S-SCH, and RS is used for P-BCH.
- the mobile station specifies a cell ID and a sector index by the centralized control RS, and the mobile station calculates the cell ID group of the distributed control S-SCH. If the mobile station determines that there is a resource for which the reception quality of the distributed control S-SCH is equal to or higher than a threshold value, the cell ID and sector index are specified by the distributed control RS.
- the mobile station determines that there is no resource for which the reception quality of the S-SCH for distributed control is equal to or higher than a threshold, the centralized control Reporting the cell ID specified by RS together with the reception quality.
- the wireless communication system of the present invention uses S-SCH by performing symbol synchronization using P-SCH at the time of cell search, and a base station that manages centralized control resource, and a relay station that manages distributed control resource. And a mobile station that performs frame synchronization and performs P-BCH reception and demodulation / decoding, wherein the relay station performs centralized control P-BCH, S-SCH, and P-SCH.
- a base station that manages centralized control resource
- a relay station that manages distributed control resource.
- a mobile station that performs frame synchronization and performs P-BCH reception and demodulation / decoding, wherein the relay station performs centralized control P-BCH, S-SCH, and P-SCH.
- P-BCH and S-SCH for distributed control are transmitted to the distributed control resource.
- the present invention by limiting transmission of P-SCH to only that for centralized control, it is possible to limit the frequency for searching P-SCH in initial cell search to only the frequency for centralized control. Timing synchronization can be easily identified, and cell search for both centralized control resources and distributed control resources can be easily performed. Therefore, the advantages of both centralized control and decentralized control can be selectively used while suppressing the time required for cell search.
- the present invention relates to cell search in the communication system as shown in FIG. 1, first, the cell search procedure as a premise will be described.
- the mobile station apparatuses 3 and 4 need to perform cell search, that is, identification of a scramble code for identifying a cell, at the time of cell switching (handover) accompanying movement or intermittent reception.
- cell search is well known as a method of cell search (for example, Hanada, Shin, Higuchi, Sawabashi: "3-step cell search characteristics using frequency multiplex synchronization channel in broadband multi-carrier CDMA transmission", Shin Academic Technical Report TECHNICAL REPORT OF IEICE. NS 2001-90, RCS 2001-91 (2001-07), pp. 73-78).
- Three-step cell search is performed in the order of symbol timing detection (first step), scrambling code group identification and scrambling code timing, that is, frame timing detection (second step), and scrambling code identification (third step). To be done.
- 3GPP LTE 3rd Generation Partnership Project Long Term Evolution
- cell search and SCH are also topics. It is one.
- 3GPP LTE hierarchical SCH similar to W-CDMA (Wideband Code Division Multiple Access) is adopted as the configuration of SCH.
- the hierarchical SCH is composed of P-SCH and S-SCH.
- This three-step cell search is symbol timing detection using P-SCH in the first step, frame timing detection and cell ID group detection using S-SCH in the second step, and RS (Reference (Reference) in the third step. Cell ID detection using Symbol), and then it is a procedure to demodulate P-BCH (Primary-Broadcast CHannel).
- FIG. 2 shows the cell search procedure.
- step S1 symbol synchronization
- the mobile station apparatus detects the correlation of P-SCH in the time domain, and detects OFDM symbol timing and subframe timing (SCH symbol timing). At this time, the mobile station apparatus simultaneously detects the frequency shift.
- the mobile station apparatus identifies PSC (Primary Synchronization Codes) sequences by cross correlation based on application of PVS (Precoding Vector Switching) to SCH transmission diversity.
- the mobile station apparatus identifies a PSC sequence and identifies a precoding weight matrix.
- step S2 frame synchronization
- the mobile station apparatus synchronously detects the S-SCH using the P-SCH detected in the first step as a phase reference, and cross-correlates the S-SCH in the frequency domain to obtain the cell ID group and the radio frame timing. Identify.
- step S3 (Use RS)
- the mobile station apparatus identifies the cell ID and the sector index by detecting the correlation of the RSs by cross correlation in the frequency domain. Thereafter, P-BCH reception and demodulation / decoding are performed (step S4).
- Embodiment 1 in the relay station relaying both the resource to be subjected to distributed control (distributed control resource) and the centralized control resource (centralized control resource), the relay station performs P-BCH (Primary-Broadcast for centralized control resource). CHannel), S-SCH (Secondary-Synchronization CHannel: second synchronization channel), P-BCH for distributed control resource, S-SCH are transmitted.
- a centralized control resource can obtain a diversity effect by transmitting simultaneously by a plurality of relay stations according to an instruction from a base station.
- the distributed control resources are independently scheduled and transmitted for each relay station.
- P-SCH Primary-Synchronization CHannel: first synchronization channel
- P-SCH Primary-Synchronization CHannel: first synchronization channel
- the scheduling load of the base station can be reduced, cooperative relaying can be facilitated, and changes in traffic for each relay station can be dealt with. Centralized control and distributed control can be used properly. Furthermore, since the time required for cell search can be reduced, the time required for handover to a non-synchronized cell can also be reduced.
- FIG. 3 shows an example in which centralized control resources and distributed control resources are divided by frequency, and P-BCH, S-SCH, and P-SCH are arranged in each resource.
- the RS signal is omitted from illustration because it is included in the P-BCH signal.
- F2 is a centralized control resource.
- relay station 1 transmits the P-BCH, S-SCH, and P-SCH of F1 and F2
- relay station 2 transmits the P-BCH, S-SCH, and P-SCH of F2 and F3. It is assumed that F2 is cooperative relay of relay station 1 and relay station 2.
- the mobile station Since different P-BCHs and S-SCHs are transmitted for each of the divided resources, the mobile station recognizes F1, F2, and F3 as different cells. Further, since the centralized control resource is cooperative relay of the relay station 1 and the relay station 2, it is easy to specify synchronization by the diversity effect.
- P-SCH is transmitted only on the centralized control resource, and is not transmitted on the distributed control resource.
- FIG. 4 shows the arrangement of P-BCH, S-SCH, and P-SCH in this embodiment.
- the P-BCH for centralized control and S-SCH and the P-BCH for distributed control and S-SCH are frequency-divided, and the P-BCH for distributed control and S-SCH are distributed control resources. This is an example of transmission.
- the P-BCH for centralized control and S-SCH and the P-BCH for distributed control and S-SCH are time-divided, and the P-BCH for distributed control and S-SCH are also centralized control resources. This is an example of transmission.
- the mobile stations 3 and 4 can use only the central control resource to specify subframe timing. After specifying the subframe timing, the mobile stations 3 and 4 perform signal processing of the S-SCH for centralized control and the S-SCH for distributed control, and specify the timing of the cell ID group and the radio frame. Thereafter, the mobile stations 3 and 4 perform RS signal processing to specify a cell ID and a sector index.
- the cell ID group specified by the S-SCH is designed so that the cell ID for distributed control can be calculated from the cell ID for centralized control.
- the group ID of the cell for centralized control is 3, and the S-SCH for centralized control is transmitted to F2.
- the distributed control resource S-SCH is transmitted to F1 and F3.
- F1 is 3- ⁇ obtained by subtracting ⁇ from the cell ID group of centralized control
- F3 is 3 + ⁇ obtained by adding ⁇ to the cell ID group of centralized control.
- the mobile stations 3 and 4 can specify the group ID for distributed control resources shifted in the frequency direction by specifying the group ID of the cell of the centralized control resource. Therefore, the amount of correlation calculation of S-SCH can be reduced. In addition, when the service is not performed in the distributed control resource, the S-SCH is not transmitted, so that the mobile stations 3 and 4 can determine that the service is not performed because the correlation value is low.
- the group ID of the cell for centralized control is 3 and the S-SCH is transmitted at time T2 of F2.
- the S-SCH of the distributed control resource is transmitted at times T1 and T3 of F2.
- the S-SCH transmitted to T1 and the S-SCH transmitted to T3 are respectively a cell ID group obtained by adding ⁇ indicating a shift in the time direction from the cell ID group of the centralized control resource.
- T1 is 3- ⁇ obtained by subtracting ⁇ from the cell ID group of centralized control
- T3 is 3 + ⁇ obtained by adding ⁇ to the cell ID group of centralized control.
- the group ID of the cell to be subjected to the correlation process can be changed according to the deviation in the time axis direction. be able to.
- the frequency at which the centralized control resource is allocated is preferably a frequency at which the base station transmits P-BCH, S-SCH, and P-SCH.
- synchronization of resources for distributed control is not identified if synchronization of resources for centralized control can not be identified.
- resources for centralized control are cooperatively relayed, they are characterized in that the reception quality is high due to the diversity effect as compared with the distributed control resources transmitted from a single relay station. Therefore, if synchronization can not be specified by the centralized control resource, synchronization is not specified even for the resources of distributed control, and wasteful computation can be omitted.
- FIG. 5 is a block diagram showing a configuration of a relay station apparatus according to the present embodiment.
- the wireless reception unit 39 receives a signal from the mobile station or relay station via the antenna 40, performs wireless processing such as down conversion, and outputs the processed signal to the FFT unit 38.
- the FFT unit 38 performs FFT processing using the detected FFT window timing, and outputs the result to the signal separation unit 37.
- the signal separation unit 37 separates relay data and centralized control information and setting information received from the base station.
- the relay data is output to the demodulation / decoding unit 34.
- the control information and the setting information are output to the centralized control resource assignment unit 32, the centralized control SCHBCH generation unit 11, and the distributed control SCHBCH generation unit 21.
- the demodulation / decoding unit 34 demodulates and decodes the relay data, and outputs the result to the data separation unit 31.
- the data separation unit 31 outputs the received relay data to the centralized control resource assignment unit 32 when the received relay data is transmitted by the centralized control resource.
- the data separation unit 31 outputs the received relay data to the distributed control resource allocation unit 33.
- the centralized control resource assignment unit 32 assigns resources according to the centralized control control information received from the base station, and outputs the resources to the encoding / modulation unit 35.
- the distributed control resource allocation unit 33 allocates resources according to the control information generated at the relay station, and outputs the allocated resources to the encoding / modulation unit 36.
- the encoding and modulation units 35 and 36 encode and modulate relay data, and output the result to the multiplexing unit 41.
- the centralized control SCHBCH generation unit 11 includes a P-SCH generation unit 12, an S-SCH generation unit 13, an RS generation unit 14, a multiplication unit 15, a scramble code generation unit 16, a P-BCH generation unit 17, and an encoding / modulation unit. 18, an SFBC encoding unit 19;
- the P-SCH generation unit 12 generates a P-SCH using the PSC sequence assigned to each cell designated by the centralized control control information and the setting information, and outputs the P-SCH to the multiplexing unit 41.
- the S-SCH generation unit 13 generates an S-SCH using an SSC (Secondary Synchronization Codes) sequence corresponding to the cell ID group and frame timing information specified by the centralized control control information and setting information, and multiplexes the S-SCH. Output to the part 41.
- SSC Secondary Synchronization Codes
- the RS generation unit 14 generates an RS (Reference Symbol) sequence corresponding to a pilot signal.
- the scramble code generation unit 16 generates a cell-specific scramble code sequence generated based on the cell ID / sector index information designated by the centralized control control information / setting information.
- the multiplication unit 15 multiplies the RS sequence generated by the RS generation unit 14 by the cell-specific scramble code sequence generated by the scramble code generation unit 16, and outputs the product to the multiplexing unit 41.
- the P-BCH generation unit 17 generates a bit sequence (P-BCH) corresponding to the control information, and outputs the bit sequence (P-BCH) to the coding / modulation unit 18.
- the coding and modulation unit 18 codes and modulates the bit sequence generated by the P-BCH generation unit 17, and outputs the bit sequence to the SFBC coding unit 19.
- the SFBC coding unit 19 performs SFBC coding processing, and outputs the processed P-BCH to the multiplexing unit 41.
- the distributed control SCH BCH generation unit 21 adds the cell ID group calculation unit 22 and the cell ID / sector index information generation unit 26 to the configuration of the centralized control SCH BCH generation unit 11, and deletes the P-SCH generation unit 12 It is
- the cell ID group calculation unit 22 calculates the cell ID group from the centralized control cell ID group and the resource information (resource information for distributed control) allocated to the own station for transmission of the distributed control P-BCH and S-SCH, Determine cell ID group. In this calculation, a distributed control cell ID group number is obtained by adding a constant ⁇ * (variable of the resource number) to the central control cell ID group number. The cell ID group calculation unit 22 inputs the cell ID group of the calculation result to the S-SCH generation unit 23.
- the cell ID / sector index information generation unit 26 generates cell ID and sector index information according to the distributed control resource information allocated to the own station and the cell ID group number output from the cell ID group calculation unit 22. , And input to the scramble code generation unit 27.
- the multiplexing unit 41 performs time multiplexing processing for generating a radio frame on the signals output from the centralized control SCH BCH generation unit 11, the distributed control SCH BCH generation unit 21, and the encoding / modulation units 35 and 36.
- To form a transmission signal which is output to the IFFT unit 42.
- the IFFT unit 42 performs IFFT processing on the transmission signal output from the multiplexing unit 41, converts time axis data into frequency axis data, forms an OFDM symbol, and outputs the OFDM symbol to the wireless transmission unit 43.
- the wireless transmission unit 43 performs wireless processing such as up conversion on the modulated signal output from the IFFT unit 42, and relays and transmits the signal from the antenna 44 to the base station.
- FIG. 6 is a block diagram showing the configuration of the mobile station apparatus according to the present embodiment. The description of the same parts as the block diagram of the relay station in FIG. 5 will be omitted.
- the symbol timing detection unit 71 detects OFDM symbol timing (FFT window timing) and SCH symbol timing by performing autocorrelation detection on the received signal. This process corresponds to the first half of the first step (step S1) of the cell search procedure.
- the demultiplexing unit 69 outputs the received signal to the centralized control reception processing unit 57. That is, the demultiplexing unit 69 separates the received signal into P-SCH, S-SCH, RS, P-BCH, and data, and the P-SCH for centralized control and distributed control is processed by the P-SCH reception processing unit 58. Then, the S-SCH is output to the S-SCH reception processing unit 59, the RS to the RS reception processing unit 60, the P-BCH to the P-BCH reception processing unit 62, and the data to the data reception processing unit 61.
- the P-SCH reception processing unit 58 performs an autocorrelation operation on the received signal after buffering the received signal for a fixed period. At this time, by detecting the peak value in the autocorrelation characteristic of the P-SCH of the received signal, it is possible to specify the OFDM symbol timing (one symbol period) and the SCH symbol timing (the position of SCH) in the received signal. Further, the P-SCH reception processing unit 58 performs cross correlation detection between the received signal and a PSC sequence replica which is a sequence of P-SCH, and specifies a PSC sequence used for the P-SCH. The P-SCH reception processing unit 58 outputs the phase information identified by the cross-correlation detection to the S-SCH reception processing unit 59 and the S-SCH reception processing unit 65 of the distributed control reception processing unit 63.
- the S-SCH reception processing unit 59 performs cross correlation detection between the S-SCH and the SSC sequence replica based on the phase information, and specifies the cell ID group and the frame timing.
- the S-SCH reception processing unit 59 outputs the identified cell ID group / frame timing information to the RS reception processing unit 60.
- the RS reception processing unit 60 performs processing corresponding to the third step (step S3) of the cell search procedure based on the cell ID group and frame timing information, and outputs the cell ID and sector index information to the data reception processing unit 61. Do. Further, RS reception processing unit 60 performs channel estimation based on RS, and outputs a channel estimation value to P-BCH reception processing unit 62 and data reception processing unit 61.
- P-BCH reception processing unit 62 performs P-BCH reception processing using the channel estimation value from RS reception processing unit 60, and outputs control information to data reception processing unit 61.
- the data reception processing unit 61 performs reception processing such as demodulation and decoding based on the channel estimation value, control information, and cell ID / sector index information to obtain reception data (reception signal).
- distributed control reception processing unit 63 In the distributed control reception processing unit 63, the cell ID group calculation unit 64 is added to the configuration of the central control reception processing unit 57, and the P-SCH reception processing unit 58 is deleted. In addition, the operation of the S-SCH reception processing unit 65 is also partially different.
- the cell ID group calculation unit 64 calculates a cell ID group number from the cell ID group and sector index information input from the centralized control reception processing unit 57 and the received distributed control resource information.
- the cell ID group calculation unit 64 inputs the calculation result to the S-SCH reception processing unit 65.
- the S-SCH reception processing unit 65 identifies the SSC sequence replica from the cell ID group number input from the cell ID group calculation unit 64 and the phase information input from the P-SCH reception processing unit 58, and detects cross correlation. Do.
- the phase reference in cross-correlation detection may use part of the S-SCH signal or may use RS.
- the operation of the mobile station cell search is illustrated in the flow diagram of FIG.
- the mobile station first specifies OFDM symbol timing and subframe timing using P-SCH of the centralized control resource (step S11). Then, the mobile station specifies a cell ID group and a radio frame timing by the S-SCH of the centralized control resource (step S12).
- the mobile station specifies a cell ID and a sector index by the RS of the centralized control resource (step S13), and calculates a cell ID group of the S-SCH of the distributed control resource (step S14).
- step S15 if there is a resource for which the reception quality of the S-SCH is equal to or higher than the threshold in the distributed control resource (YES), the mobile station proceeds to step S16 and If there is no resource whose reception quality is equal to or higher than the threshold (NO), the process proceeds to step S17.
- step S16 the mobile station identifies a cell ID and a sector index by RS of the distributed control resource.
- step S17 the mobile station reports the identified cell ID together with the reception quality with the centralized control and the distributed control resource. That is, when the mobile station determines that there is a resource for which the reception quality of the distributed control S-SCH is equal to or higher than the threshold, the cell ID and sector index are identified by the distributed control RS, and the identification is performed.
- the reported cell ID is reported together with the reception quality (step S15: YES, step S16, step S17), and the mobile station determines that there is no resource for which the reception quality of the S-SCH for distributed control exceeds the threshold.
- the cell ID identified by the central control RS is reported together with the reception quality (step S15: NO, step S17).
- the cell search of both the centralized control resource and the distributed control resource is easily performed by transmitting the P-SCH to the centralized control resource and not transmitting the P-SCH. Can. Also, resources for transmitting P-SCH can be reduced.
- P-SCH, S-SCH, and P-BCH arrangements in the case where centralized control resources and distributed control resources are allocated on the time axis are shown. If centralized control and distributed control are simply assigned on the time axis, there is a problem that P-SCH can not be received periodically. Therefore, in the present embodiment, even when distributed control is being transmitted, P-SCH, S-SCH, and P-BCH for centralized control are periodically transmitted. In this way, mobile stations performing cell search can receive P-SCH, S-SCH, and P-BCH for centralized control.
- T2 is a centralized control resource
- T1 and T3 are distributed control resources
- different P-BCH and S-SCH are transmitted
- T1 , T2 and T3 are recognized as different cells.
- T2 can easily identify synchronization due to the diversity effect of cooperative relay.
- P-BCH, S-SCH, and P-SCH for centralized control are time resources allocated to distributed control resources, they are transmitted from a plurality of relay stations. In this way, since the P-BCH, S-SCH, and P-SCH are periodically transmitted, the mobile station can easily identify synchronization. Also, due to the diversity effect, the number of mobile stations that can perform cell search increases.
- T1 is a resource allocated to the relay station 1
- T3 is a resource allocated to the relay station 2
- T2 is a resource to be cooperatively relayed between the relay station 1 and the relay station 2.
- the relay station 1 and the relay station 2 transmit P-BCH, S-SCH, and P-SCH for centralized control.
- the relay stations 1 and 2 also transmit P-BCH, S-SCH, and P-SCH for centralized control to T1 and T3.
- the relay station 1 transmits the P-BCH and S-SCH for distributed control of the relay station 1 at T1
- the relay station 2 transmits the P-BCH and S-SCH for distributed control at T3.
- subframe timing is specified by P-SCH for centralized control without transmitting P-SCH for distributed control, and distributed control is performed from the position of P-SCH for centralized control. It is possible to identify the P-BCH and S-SCH for use.
- the S-SCH for centralized control and the S-SCH for distributed control are arranged so as to sandwich the P-SCH for centralized control.
- Such an arrangement makes it easy to identify the arrangement position of the S-SCH from the position of the P-SCH.
- the location of the centralized control resource is specified.
- T2 is a centralized control resource.
- the cell ID group may be arranged so as to be able to be identified depending on how far away from T2 the resource for distributed control is arranged. By doing this, as in the first embodiment, it is possible to reduce the amount of correlation calculation of the distributed control S-SCH.
- FIG. 10 is a block diagram showing a configuration of a relay station apparatus according to the present embodiment. Descriptions of parts in common with FIG. 5 will be omitted.
- the relay station apparatus shown in FIG. 10 has a configuration in which the transmission selection unit 82 is added to the configuration of the relay station apparatus shown in FIG. 5 and the FFT unit 38 is deleted.
- the transmission selection unit 82 receives S-SCH, RS, and P-BCH from the SCHBCH generation unit for distributed control 21. Also, distributed control resource information is also input. The transmission selection unit 82 transmits the S-SCH, RS, and P-BCH for distributed control only when distributed control resources for the own station are allocated.
- the P-SCH, S-SCH, RS, and P-BCH for centralized control are periodically transmitted.
- the P-BCH, S-SCH, and P-BCH for centralized control can be periodically received, so that a mobile station that performs cell search Makes the correlation operation easy.
- the blocks respectively provided for centralized control and distributed control in the block diagrams may be shared by centralized control and distributed control.
- the resources may be frequency resources, time resources, code separated resources, space resources, or a combination thereof.
- the resource to which P-BCH and S-SCH are transmitted and the resource to which the cell is allocated do not have to be the same.
- the mobile station can obtain the resource information allocated to the cell from the control information acquired on the P-BCH, and follows the information.
- a plurality of relay stations may be grouped, and P-SCH, S-SCH, and P-BCH for centralized control may be assigned to each group.
- the relay station in each of the above embodiments may be expressed as a relay station, a repeater, a simple base station, or a cluster head.
- Each function block employed in the description of each of the aforementioned embodiments may typically be implemented as an LSI constituted by an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include some or all. Although an LSI is used here, it may be called an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible.
- a programmable field programmable gate array FPGA
- a reconfigurable processor may be used which can reconfigure connection and setting of circuit cells in the LSI.
- the present invention has the effect of selectively utilizing the advantages of both centralized control and decentralized control while suppressing the time required for cell search, and is useful as a wireless communication apparatus etc. that relays communication between a base station and a mobile station. It is.
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Abstract
Description
3,4 移動局
5 基地局
11 集中制御用SCH BCH生成部
12,23 P-SCH生成部
13 S-SCH生成部
14,24 RS生成部
15 乗算部
16,27 スクランブル符号生成部
17,28 P-BCH生成部
18,29 符号化・変調部
19,30 SFBC符号化部
21 分散制御用SCH BCH生成部
22 セルIDグループ計算部
26 セルID・セクタインデックス情報生成部
31 データ分離部
32 集中制御用リソース割当部
33 分散制御用リソース割当部
34 復調・復号部
35,36 符号化・変調部
37 信号分離部
38 FFT部
39 無線受信部
40,44 アンテナ
41 多重化部
42 IFFT部
43 無線送信部
57 集中制御用受信処理部
58 P-SCH受信処理部
59 S-SCH受信処理部
60,66 RS受信処理部
61,67 データ受信処理部
62,68 P-BCH受信処理部
63 分散制御用受信処理部
64 セルIDグループ計算部
65 S-SCH受信処理部
69 逆多重化部
71 シンボルタイミング検出部
81 セルID計算部
82 送信選択部
(P-SCHを使用)
まず、移動局装置は、時間領域でP-SCHの相関を検出し、OFDMシンボルタイミングとサブフレームタイミング(SCHシンボルタイミング)を検出する。このとき、移動局装置は、周波数ずれも同時に検出する。特に、第1段階では、移動局装置はSCH用送信ダイバーシチへのPVS(Precoding Vector Switching)適用に基づく相互相関によりPSC(Primary Synchronization Codes)系列の特定を行う。移動局装置は、PSC系列を特定し、プリコーディングウェイト行列を特定する。
(S-SCHを使用)
移動局装置は、第1段階で検出されたP-SCHを位相基準にしてS-SCHを同期検波し、周波数領域でS-SCHの相互相関を取ることによって、セルIDグループ及び無線フレームタイミングを特定する。
(RSを使用)
移動局装置は、周波数領域で相互相関によりRSの相関を検出することによって、セルID、及びセクタインデックスを特定する。その後、P-BCHの受信、復調/復号が行われる(ステップS4)。
本実施の形態では、分散制御するリソース(分散制御リソース)と、集中制御リソース(集中制御リソース)の両方を中継する中継局において、中継局は、集中制御リソース用のP-BCH(Primary-Broadcast CHannel)、S-SCH(Secondary-Synchronization CHannel:第2同期チャネル)と分散制御リソース用のP-BCH、S-SCHを送信する。集中制御リソースは、複数の中継局が基地局からの指示に従い同時に送信することで、ダイバーシチ効果を得ることができる。分散制御リソースは、中継局ごとに独自にスケジューリングをして送信する。
まず、本実施の形態の説明に先立ち、集中制御リソースと分散制御リソースとを周波数で分割し、各リソースにP-BCH、S-SCH、P-SCHをそれぞれ配置する例を図3に示す。RS信号は、P-BCH信号に含まれているとして、図示を省略する。分割されたリソース毎に、P-BCH、S-SCH、P-SCHを送信することにより、それぞれが異なるセルであると移動局に認識させることができる。
分散制御リソースのS-SCHは、F1とF3に送信されている。F1に送信されるS-SCHとF3に送信されるS-SCHは、それぞれ、集中制御リソースのセルIDグループ(ID=3)から、周波数方向のずれを表すαを加算したセルIDグループとする。同図では、F1は集中制御のセルIDグループからαを引いた3-α、F3は集中制御のセルIDグループにαを足した3+αとなる。このように、移動局3,4は、集中制御リソースのセルのグループIDを特定したことにより、周波数方向にずれている分散制御リソース用のグループIDを特定できる。したがって、S-SCHの相関演算量を減らすことができる。また、分散制御リソースで、サービスが行われていない場合、S-SCHは送信されないため、移動局3,4は、相関値が低いことからサービスが行われていないと判断できる。
T1に送信されるS-SCHとT3に送信されるS-SCHはそれぞれ、集中制御リソースのセルIDグループから、時間方向のずれを表すαを加算したセルIDグループとする。同図では、T1は集中制御のセルIDグループからαを引いた3-α、T3は集中制御のセルIDグループにαを足した3+αとなる。
図5は本実施の形態に係る中継局装置の構成を示すブロック図である。無線受信部39は、移動局または中継局からの信号をアンテナ40を介して受信し、ダウンコンバート等の無線処理を施し、FFT部38へ出力する。FFT部38は、検出されたFFTウィンドウタイミングを用いてFFT処理を行い、信号分離部37に出力する。
P-SCH受信処理部58は、一定期間受信信号をバッファした後、受信信号の自己相関演算を行う。このとき、受信信号のP-SCHの自己相関特性においてピーク値が検出されることにより、受信信号におけるOFDMシンボルタイミング(1シンボル区間)とSCHシンボルタイミング(SCHの位置)が特定できる。
また、P-SCH受信処理部58は、受信信号とP-SCHの系列であるPSC系列レプリカとの相互相関検出を行い、P-SCHに使用されていたPSC系列を特定する。P-SCH受信処理部58は、相互相関検出により特定した位相情報をS-SCH受信処理部59および分散制御用受信処理部63のS-SCH受信処理部65へ出力する。
分散制御用受信処理部63は、集中制御用受信処理部57の構成に、セルIDグループ計算部64が追加され、P-SCH受信処理部58が削除されたものである。またS-SCH受信処理部65の動作も一部異なる。
本実施の形態では、時間軸上に集中制御リソースと分散制御リソースが割当てられる場合のP-SCH、S-SCH、P-BCH配置を示す。単純に時間軸上で、集中制御と分散制御を割当てると、周期的にP-SCHを受信できないという問題がある。そこで本実施の形態では、分散制御を送信しているときにも、集中制御用のP-SCH、S-SCH、P-BCHを周期的に送信する。このようにすると、セルサーチをする移動局は、集中制御用のP-SCH、S-SCH、P-BCHを受信することができる。
まず、本実施の形態の説明に先立ち、集中制御リソースと分散制御リソースとを時間で分割し、各リソースにP-BCH、S-SCH、P-SCHをそれぞれ配置する例を図8に示す。分割されたリソース用に、P-BCH、S-SCH、P-SCHを送信すると、それぞれを異なるセルと移動局に認識させることができる。
図10は、本実施の形態に係る中継局装置の構成を示すブロック図である。図5と共通する部分については説明を省略する。図10に示す中継局装置は、図5に示した中継局装置の構成に、送信選択部82を追加し、FFT部38を削除したものである。
送信選択部82は、分散制御用SCHBCH生成部21から、S-SCH、RS、P-BCHが入力される。また、分散制御リソース情報も入力される。送信選択部82は自局用の分散制御リソースが割当てられたときのみ、分散制御用のS-SCH、RS、P-BCHを送信する。
本出願は、2008年3月18日出願の日本特許出願No.2008-070271に基づくものであり、その内容はここに参照として取り込まれる。
Claims (7)
- 基地局と、セルサーチ時にP-SCHを使用してシンボル同期を行い、S-SCHを使用してフレーム同期を行い、P-BCHの受信、復調/復号を行う移動局との通信を、集中制御リソースおよび分散制御リソースを使用して中継する無線通信装置であって、
集中制御用のP-BCH、S-SCHおよびP-SCHを前記集中制御リソースに送信し、分散制御用のP-BCHおよびS-SCHを前記分散制御リソースに送信する無線通信装置。 - 請求項1記載の無線通信装置であって、
前記集中制御リソースおよび前記分散制御リソースが周波数で分割されている場合に、前記集中制御用のP-BCHおよびS-SCHを前記集中制御リソースに送信し、前記分散制御用のP-BCHおよびS-SCHを前記分散制御リソースに送信する無線通信装置。 - 請求項1記載の無線通信装置であって、
前記集中制御リソースおよび前記分散制御リソースが周波数で分割されている場合に、前記集中制御用のP-BCHおよびS-SCH、および前記分散制御用のP-BCHおよびS-SCHを、前記集中制御リソースに時間分割して送信する無線通信装置。 - 請求項2または3記載の無線通信装置であって、
分散制御用のS-SCHで使用されるスクランブリングコードを、集中制御用のS-SCHに使用されるスクランブリングコードと、分散制御用のS-SCHが送信されるリソースと集中制御用のS-SCHが送信されるリソースとがどれだけ離れているかを示す指標αとから算出する無線通信装置。 - 請求項1記載の無線通信装置であって、
前記集中制御リソースおよび前記分散制御リソースが時間で分割されている場合においては、前記分散制御リソースおよび前記集中制御リソースのいずれが割当てられている時間であるかにかかわらず、前記集中制御用のP-BCHおよびS-SCHを周期的に送信する無線通信装置。 - 基地局と、セルサーチ時にP-SCHを使用してシンボル同期を行い、S-SCHを使用してフレーム同期を行い、RSを使用してP-BCHの受信、復調/復号を行う移動局との通信を、集中制御リソースおよび分散制御リソースを使用して中継する無線通信方法であって、
集中制御用のP-BCH、S-SCHおよびP-SCHを前記集中制御リソースに送信するステップと、
分散制御用のP-BCHおよびS-SCHを前記分散制御リソースに送信するステップと、
前記移動局が、前記集中制御用のP-SCHで、OFDMシンボルタイミングとサブフレームタイミングを特定するステップと、
前記移動局が、前記集中制御用のS-SCHで、セルIDグループ、無線フレームタイミングを特定するステップと、
前記移動局が、前記集中制御用のRSで、セルIDおよびセクタインデックスを特定するステップと、
前記移動局が、前記分散制御用のS-SCHの前記セルIDグループを計算するステップと、
前記移動局が、前記分散制御用のS-SCHの受信品質がしきい値以上になるリソースがあると判断した場合においては、前記分散制御用のRSで、セルID、セクタインデックスを特定し、特定したセルIDを受信品質とともに報告し、
前記移動局が、前記分散制御用のS-SCHの受信品質がしきい値以上になるリソースがないと判断した場合においては、前記集中制御用のRSで特定したセルIDを受信品質とともに報告するステップと、を有する無線通信方法。 - 集中制御リソースを管理する基地局と、分散制御リソースを管理する中継局と、セルサーチ時にP-SCHを使用してシンボル同期を行い、S-SCHを使用してフレーム同期を行い、P-BCHの受信、復調/復号を行う移動局とを含む無線通信システムであって、
前記中継局が、集中制御用のP-BCH、S-SCHおよびP-SCHを前記集中制御リソースに送信し、分散制御用のP-BCHおよびS-SCHを前記分散制御リソースに送信する無線通信システム。
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