WO2002049387A1 - Systeme de radiocommunication - Google Patents
Systeme de radiocommunication Download PDFInfo
- Publication number
- WO2002049387A1 WO2002049387A1 PCT/JP2001/010498 JP0110498W WO0249387A1 WO 2002049387 A1 WO2002049387 A1 WO 2002049387A1 JP 0110498 W JP0110498 W JP 0110498W WO 0249387 A1 WO0249387 A1 WO 0249387A1
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- Prior art keywords
- base station
- communication
- mobile station
- mobile
- station
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- 238000004891 communication Methods 0.000 title claims abstract description 303
- 230000006854 communication Effects 0.000 title claims abstract description 303
- 230000004044 response Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 30
- 230000005540 biological transmission Effects 0.000 description 25
- 238000000034 method Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000007175 bidirectional communication Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/002—Mutual synchronization
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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
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
-
- 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
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
- H04B7/265—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for channel frequency control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J4/00—Combined time-division and frequency-division multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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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]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/18—Interfaces between hierarchically similar devices between terminal devices
Definitions
- the present invention relates to a wireless communication system including a base station and a mobile station, and more particularly, to an improvement of a direct communication method between mobile stations in a wireless communication system using a TDMA (Time Division Multiple Access) system.
- TDMA Time Division Multiple Access
- a radio system consisting of a base station and a plurality of mobile stations that report the allocation of the band (time domain for communication) using the TDMA method (a method that allocates different time regions to the respective mobile stations at the same frequency and performs communication)
- TDMA method a method that allocates different time regions to the respective mobile stations at the same frequency and performs communication
- RCIB STD-28 second generation cordless telephone system standard version 1 of ARIB (Association of Radio Industries and Businesses)
- PHS a direct communication method between mobile stations has been proposed. Further, as an improvement thereof, there is one disclosed in JP-A-11-122663 and JP-A-11-341564.
- FIG. 13 is a diagram illustrating an example of a frame configuration in a TDMA wireless communication system.
- the use time of the same frequency for performing communication is divided into frames 1 at certain time intervals.
- the base station uses control information 2 as information for synchronizing multiple mobile stations with the base station and information indicating the band (time domain) in the frame allocated to each mobile station. It is transmitted to all mobile stations within the wireless LAN area created by the base station.
- control information 2 will be described with reference to FIG.
- a digital signal composed of a preamble 200 for broadcast and a data payload 201 (data payload 1, ..., data payload N) that is information data to be transmitted is converted into an electric signal.
- the signal received from the wireless interface is identified by the preamble 200 located at the head.
- the broadcast preamble 200 added when the base station transmits the broadcast information in the radio cell is a synchronization signal for the mobile station in the radio cell to synchronize with the base station.
- the control information 2 includes control information such as frame configuration information and band allocation information.
- FIG. 14 is a block diagram illustrating a configuration example of a wireless LAN using the above wireless communication system.
- reference numeral 7 denotes a wide area network WAN (Wide Area Network)
- 8 denotes a wireless LAN (Local Area Network)
- wireless RAN 8 denotes a plurality of mobile stations 1 ;! 13 and a base station 10 which is connected to or has a central control device 9 for centrally controlling the obi castle allocation, and is connected to the wide area network 7 through the base station 10.
- WAN Wide Area Network
- LAN Local Area Network
- wireless RAN 8 denotes a plurality of mobile stations 1 ;! 13 and a base station 10 which is connected to or has a central control device 9 for centrally controlling the obi castle allocation, and is connected to the wide area network 7 through the base station 10.
- central control device 9 for centrally controlling the obi castle allocation
- the mobile stations 11 to 13 perform communication between the base station and the mobile station according to the band allocation information notified by the base station 10. These channels are shown as channels 14-16.
- the communication path of the direct communication between mobile stations in which mobile station 11 (mobile station 1>) and mobile station 12 (mobile station 2>) perform direct communication is indicated by communication path 17.
- FIG. 15 is a diagram showing an example of a frame configuration in direct communication between mobile stations in a conventional wireless communication system.
- frame synchronization is established by control information 18 transmitted by the base station.
- This is a frequency for direct communication between mobile stations separately from a frequency for performing communication, and one of the mobile stations performing direct communication between mobile stations transmits control information 19.
- a mobile station that performs direct communication between mobile stations has been realized by having a base station function that synchronizes frames between mobile stations that perform direct communication between mobile stations and performs band allocation.
- C SMAZCA International 1 Organization for Standardization / International Electrotechnical Communications
- IIEEE Institute of Electrical and Electronics Engineers
- 201 0 following wireless LAN system using Carrier Sense Multiple Access with Collision Avoidance (Personal Digital Cellular) mobile phone, PHS (Personal Handy-phone system), W-CDMA (Wideband Code Division Multiple Access)
- ETSI European Telecommunications Standards Institute
- Hiper LAN and AR IB Association of Radio Industries and Businesses
- MMAC Multimedia Mobile Access Communication Systems
- IEEEE 802.11 is not a centralized control wireless system that has a central control unit that performs centralized control of band allocation.Hiper LAN, etc. uses a system that uses the same frequency as base station mobile station communication. Therefore, it is not directly related to the present invention, but will be briefly described.
- FIG. 16 is a diagram illustrating a communication example in the IEEE802.11 system.
- FIG. 17 is a diagram showing an example of a frame configuration in the Hiper LAN system.
- the same components as those in 13 are denoted by the same reference numerals.
- a band 28 for direct communication between mobile stations is prepared in a frame 27 of the TDMA system, and in this band 28, the base station stops transmitting and mobile stations communicate with each other. By performing transmission, communication between the base station and mobile station and direct communication between mobile stations are performed at one frequency.
- data communication is performed simultaneously with mobile station 11 (mobile station 1 »and mobile station 12 (mobile station 2)) and base station 10.
- mobile station 11 mobile station 1 »and mobile station 12 (mobile station 2)
- base station 10 mobile station 2
- the usage of telephone communication has changed from voice communication to overnight communication.
- the mobile station is intermittently disconnected from the network, and data is sent to the mobile station in the wireless LAN from the wide area network (for example, the Internet) to which the base station is connected.
- the base station cannot transmit data to the mobile station, or the connection setting with the mobile station has not been made, the base station does not even know the existence of the base station.
- a gateway device including a base station connected to the external Internet is located in the Internet, and home information appliances (fridge, range, TV, video server, set-top box, etc.) are used as mobile stations for wireless LAN (home network).
- home information appliances ridge, range, TV, video server, set-top box, etc.
- the video information cannot be sent from the external network to the video server while the video information is wirelessly transmitted from the video server to the TV.
- the connection with the base station is cut off, you will not be able to confirm that it exists on the network.
- one of the mobile stations must perform the role of a base station, and thus there is a problem that the functions of the base station must be added to the mobile station. .
- the present invention can perform communication between base stations and mobile stations even when performing direct communication between mobile stations at frequencies other than that of the base station, and can perform mobile communication by controlling the base station direct communication between mobile stations.
- An object of the present invention is to provide an efficient wireless communication system that can reduce the load on a station and can simultaneously use a plurality of frequencies with one base station. Disclosure of the invention
- a wireless communication system includes: a base station; and a mobile station wirelessly connected to the base station.
- a wireless communication system capable of performing communication between the mobile stations without passing through a base station.
- a second frequency different from the first frequency used for communication between mobile stations in direct communication between mobile stations based on control information used for communication between base stations and mobile stations, communication between base stations and mobile stations Synchronization means for synchronizing the frame and the frame in the direct communication between mobile stations is provided.
- the mobile station of the present invention is wirelessly connected to a base station, and communicates between base station mobile stations using a first frequency, and between mobile stations that do not pass through the base station, using a second frequency different from the first frequency.
- a mobile station capable of direct communication comprising synchronization means for synchronizing a frame in base station mobile station communication with a frame in mobile station direct communication based on control information used in the base station mobile station communication.
- a base station is a base station in a wireless communication system including a base station and a mobile station wirelessly connected to the base station, wherein the base station communicates with a base station based on a request from the mobile station.
- Allocating means for allocating a second frequency different from the first frequency used for direct communication between mobile stations.
- the base station includes: a base station; and a mobile station wirelessly connected to the base station.
- the base station communicates with the base station using a first frequency, and a second frequency different from the first frequency.
- a base station in a wireless communication system capable of direct communication between mobile stations without passing through the base station, wherein direct communication between mobile stations is performed based on a request from the mobile station.
- Allocating means for allocating a band within a frame in the communication.
- the base station further includes a holding unit that performs carrier sense on a plurality of available frequencies and holds an available frequency other than the frequency used by the base station.
- FIG. 1 is a block diagram illustrating a configuration of an example of a base station and a mobile station device in a wireless communication system of the present invention.
- FIG. 2 is a diagram illustrating an example of a frame configuration in direct communication between mobile stations in the wireless communication system.
- FIG. 3 is a block diagram illustrating a configuration example of a wireless LAN using the present wireless communication system.
- FIG. 4 is a control sequence diagram illustrating a data flow in a communication example of the present wireless communication system.
- FIG. 5 is a flowchart showing communication processing on the base station side of the present wireless communication system.
- FIG. 6 is a flowchart showing communication processing on the mobile station side of the present wireless communication system.
- FIG. 7 is a flowchart showing the wireless processing of the present invention.
- FIG. 1 is a block diagram illustrating a configuration of an example of a base station and a mobile station device in a wireless communication system of the present invention.
- FIG. 2 is a diagram illustrating an example of a
- FIG. 8 is a control sequence diagram illustrating a data flow in the communication system
- FIG. 8 is a block diagram illustrating band allocation in the present wireless communication system
- FIG. 10 is a block diagram showing a frame assignment in the wireless communication system
- FIG. 10 is a diagram showing an example of a base station and mobile station communication situation in the present wireless communication system, and a block diagram showing a frame assignment in the present wireless communication system
- 12 is a diagram showing an example of a base station and mobile station communication situation in the present wireless communication system
- FIG. 13 is a diagram showing an example of a frame configuration in a TDMA wireless communication system of a conventional wireless communication system.
- FIG. 14 is a block diagram illustrating a configuration example of a wireless LAN using a conventional wireless communication system
- FIG. 15 is a diagram illustrating a frame configuration example of direct communication between mobile stations in a conventional wireless communication system. Yes, FIG. 16 is a diagram showing an example of communication in the IEEE 802.11 system, and FIG. 17 is a diagram showing an example of a frame configuration in the Hyper LAN system.
- FIG. 1 shows a base station and a mobile station in a wireless communication system according to a first embodiment of the present invention.
- FIG. 3 is a block diagram illustrating a configuration of an example of a mobile station device.
- reference numeral 30 denotes a base station in a wireless communication system
- reference numeral 40 denotes a mobile station that performs wireless communication with the base station 30
- base station 30 is an example of a base station device incorporating a central control device 31. .
- the base station 30 includes a central controller 31 for allocating a band in a communication frequency frame according to a band allocation request, an antenna 32 for wireless transmission and reception, and a wireless processing unit 3 for detecting an available frequency. 3, frame processing means 34 for performing frame processing for converting control information such as allocated band allocation information into data for transmission, and signals and central control unit 31 for performing frame synchronization. Wireless control means 35 for creating control information such as bandwidth allocation information and the like, and line processing means 3 6 for sending external transmission data to the frame processing means 34 according to the instructions of the wireless control means 35 and adjusting the format. And is provided.
- the central control device 31 performs calculation of time allocation and the like, and may be built in the base station 30 as in the present embodiment, or may be outside the base station 30.
- the mobile station 40 is based on an antenna 42 for wireless transmission / reception, a wireless processing means 43 for receiving communication data and sending it to the frame processing means 44, and a control signal from the base station 30 received.
- Frame processing means 44 which synchronizes the frame with the data and separates it into control information and received data;
- wireless control means 45 which decodes band allocation information and saves it as control information during communication data transmission / reception processing;
- a line processing means 46 for sending the data for transmission from the frame processing means 44 according to the instruction of the wireless control means 45 and adjusting the format.
- the radio control processing means 45 notifies the radio processing means 43 that the transmission / reception operation starts when the allocated bandwidth (time) in the frame is reached, and in the case of direct communication between mobile stations, the mobile station The wireless processing means 43 is notified of the change to the frequency for inter-direct communication.
- the radio communication system employs, when a second frequency different from the first frequency used for communication between base stations and mobile stations is used for direct communication between mobile stations, control used for communication between base stations and mobile stations.
- Synchronizing means for synchronizing a frame in base station mobile station communication with a frame in mobile station direct communication based on the information, and a band for mobile station direct communication according to an allocation request from base station 30 or mobile station 40.
- assign frequencies The base station 30 and the mobile station 40 further include a transmitting unit and a receiving unit for transmitting and receiving an allocation request and allocation notification information between the base station 30 and the mobile station 40.
- the mobile station 40 is provided with control means for changing the radio frequency according to the allocation, so that even when direct communication between mobile stations is performed, it is possible to simultaneously perform communication between base stations and mobile stations. Is what you do.
- the base station 30 includes a holding unit that performs carrier sensing at a plurality of available frequencies and holds available frequencies other than the frequencies used by the base station 30.
- FIG. 2 is a diagram illustrating an example of a frame configuration in direct communication between mobile stations in the wireless communication system, and illustrates an example of a frame configuration and band allocation. This corresponds to the frame configuration in Fig. 15 of the conventional example.
- this frame configuration consists of information for synchronizing a plurality of mobile stations 40 with the base station 30 for each frame (constant period) and the frames allocated to each mobile station.
- Control information 50 which is information indicating the band (time domain) within the network, and a communication band D OWN-LINK 51 and a mobile station 40 for transmitting data from the base station 30 to the mobile station 40 in the frame.
- Communication band for transmitting data to base station 30 UP- LINK 52 Time zone is divided.
- the control information 50 is composed of a broadcast preamble 200 and a data payload 201, and the broadcast preamble 200 is It includes a synchronization signal for the mobile station in the radio cell to synchronize with the base station, and control information such as frame configuration information and band allocation information.
- the frequency for direct communication between mobile stations is independent of the frequency for performing frame synchronization and communication based on control information 50 transmitted by base station 30.
- a mobile station performing direct communication uses base station mobile station communication control information 50 instead of conventional direct mobile station direct communication control information 53 to communicate between base station mobile station communication and mobile station communication. Synchronize frames for direct communication.
- 54 is a band for direct communication.
- FIG. 2 (c) shows an example of a band allocation example of communication between a base station and a mobile station.
- 55 is control information to which the control information 50 is allocated, and 56 is the DOWN-LINK. Bands D 1 and 57 assigned 5 1 are the band U 1 assigned UP-LINK 52.
- control information 50 of communication between base stations and mobile stations is also used in direct communication between mobile stations as described above. Therefore, control information (control information 53) based on conventional direct communication between mobile stations is not used.
- Reference numeral 58 denotes a band Di1 to which the above-described direct communication band 54 is allocated.
- the communication band D OWN-LI NK 51 from the base station 30 to the mobile station 40 and the mobile station 40 to the base station 30 The communication band UP-LINK 52 to the mobile station 40 and the band 54 for direct communication from the mobile station 40 to the mobile station 40 can be processed in the same row.
- the operation of the wireless communication system configured as described above will be described.
- FIG. 3 is a block diagram showing a configuration example of a wireless LAN using the present wireless communication system.
- the same components as those in FIG. 14 are denoted by the same reference numerals.
- the wireless LAN 8 includes a plurality of mobile stations 40A to 40C and a base station 30 having a central control device 31 therein, and is connected to the wide area network 7 via the base station 40.
- the mobile stations 40A to 40C have the same configuration as the mobile station 40 in FIG. 1, and perform communication between base stations and mobile stations according to the band allocation information notified by the base station 40. These channels are shown as channels 14-16. Further, a communication path of the direct communication between mobile stations in which the mobile station 4 OA (mobile station 1>) and the mobile station 40B (mobile station 2) directly communicate is indicated by a communication path 17.
- band allocation to the mobile station 4OA (mobile station 1>) that wants to communicate with the base station 30 and the mobile station 40B (mobile station 2>) will be described with reference to the band allocation example of FIG. 2 and 3, the mobile station 40A (mobile station 1>) receives frame synchronization and band allocation according to control information 55 from the base station 30.
- Band 56 (band D 1) is the band for communication from base station 30 to mobile station 4 OA (mobile station 1>), and band 57 (band U1) is from mobile station 40A (mobile station 1>) to the base station.
- the band for communication to 30 and band 58 (band D i 1) is the band for communication from mobile station 4 OA (mobile station x 1>) to mobile station 40 B (mobile station x 2>).
- FIG. 4 is a control sequence diagram showing a data flow in the above communication example, and the numbers in the figure indicate processing steps.
- the mobile station 4 OA mobile station 1>
- the mobile station 40B mobile station 2>
- the mobile station 4 OA uses the band for direct communication between mobile stations for transmitting data to the mobile station 40B (mobile station 2) in the allocated band of UP—LINK 52.
- An allocation request (No. 61) and a normal band allocation request for base station mobile station communication (No. 62) are transmitted to the base station 30.
- the mobile station 40 B (mobile station 2>) transmits a normal base station mobile station communication band allocation request (number 63) to the base station 30 in the allocated band of the UP-LINK 52.
- the base station 30 transmits to the central control device 31 an allocation request (number 64) in which the band allocation request information from each mobile station and the band allocation request from the base station 30 to the mobile station are compiled.
- the central controller 31 In response to the bandwidth allocation request (No. 64), the central controller 31 notifies the base station 30 of the bandwidth allocation information in the frame of the next base station mobile station communication frequency and the next mobile station direct communication frequency frame ( Number 65).
- the band for direct communication from the mobile station 4 OA (mobile station 1>) to the mobile station 40B (mobile station 2>) and the frequency allocation information (number 66) )
- mobile station 4 OA mobile station ⁇ 1>
- mobile station 40B mobile station ⁇ 2>
- base station mobile station communication band allocation information (number 67) and (number 68).
- Each mobile station performs reception processing in the control information band.
- the base station 30 is a base station for the mobile station 4 OA (mobile station ⁇ 1>) and the mobile station 40 B (mobile station x 2) in the allocated band in the base station mobile station communication frequency DOWN—LI NK51.
- the communication data between mobile stations (No. 69) and (No. 70) are transmitted, and each mobile station performs reception processing in the allocated band.
- the mobile station 4 OA (mobile station x 1 ⁇ ) transmits direct communication data between mobile stations to mobile station 40B (mobile station x 2 ⁇ ) (No. 71) in the direct communication allocation band of the frequency for direct communication between mobile stations.
- the mobile station 40B (mobile station 2>) performs reception processing at the assigned zone castle. Do.
- the mobile station 4 OA (mobile station 1>) and the mobile station 4 OB (mobile station 2>) perform base station mobile station communication with the base station 30 in the allocated band in the UP-LINK 52 2. Nos. 7 2) and (No. 7 3) are transmitted, and base station 30 performs reception processing in the assigned band castle.
- FIG. 5 is a flowchart showing communication processing on the base station 30 side, in which S indicates a flow step.
- the available frequency is detected by the wireless processing means 33 (FIG. 1) of the base station 30.
- the base station 30 selects a frequency to be used among the detected frequencies, prepares for transmission / reception, and notifies the central controller 31 of a frequency usable for communication between mobile stations. At the same time, it notifies the central controller 31 of a frequency that can be used other than the frequency used by the base station 30.
- a signal for performing frame synchronization and control information such as band allocation information allocated by the central controller 31 are created by the wireless control means 35, and the frame processing means 3
- the data is converted into transmission data by 4 and transmitted by the wireless processing means 33 and the antenna 32.
- the transmission data from the outside is transmitted by the line processing means 36 to the frame processing means 34 according to the instruction of the wireless control means 35, and the transmission data is transmitted by the frame processing means 34. And then transmitted by the wireless processing means 33 and the antenna 32.
- a wireless signal is received by the antenna 32 and the wireless processing means 33.
- the received data is separated into control information and received data by the frame processing means 34.
- Control information such as a bandwidth allocation request is processed by the wireless control means 35, and necessary information is sent to the central control device 31 for processing.
- the received data is sent to the outside after being formatted in an external format by the line processing means 36.
- step S15 it is determined whether or not the communication is completed. If the communication is not completed, the process returns to step S11 to repeat the above-described processing.
- FIG. 6 is a flowchart showing communication processing on the mobile station side.
- a usable frequency is detected by the wireless processing means 43.
- step S22 frame synchronization is obtained based on the control signal from the base station 30 received by the antenna 42 and the wireless processing means 43, and the frame processing means 44 converts the control information into control information. After conversion, the band allocation information and the like are decoded by the wireless control processing means 45 and stored as control information in the communication data transmission / reception processing.
- the wireless control processing means 45 When the allocated bandwidth (time) in the frame is reached, the wireless control processing means 45 notifies the wireless processing means 43 that the transmission / reception operation is to be started, and in step S23 whether or not direct communication between mobile stations is to be performed. In the case of direct communication between mobile stations, the change to the frequency of direct communication between mobile stations is notified to the wireless processing means 43 in step S24, the transmission / reception frequency is changed, and the flow proceeds to step S25. move on. If the communication is not direct between mobile stations, the process proceeds directly to step S25.
- the wireless processing means 43 receives the communication data and sends it to the frame processing means 34 to separate it into control information and received data.
- the control information is processed by the wireless control means 35.
- the received data is sent to the outside after being formatted into an external format by the line processing means 36.
- the transmission processing from the outside is transmitted to the frame processing means 34 by the line processing means 36, and the data converted to the transmission data is transmitted to the wireless processing means 43 and Transmit via antenna 42.
- step S26 it is determined whether or not there is a band. If there is a band, the process returns to step S23 to repeat the above processing. If there is no band, it is determined in step S27 whether or not communication has ended. If the communication has not ended, the flow returns to step S21 to repeat the flow. If the communication has ended, the flow ends.
- the central control device 31 uses the second frequency different from the first frequency used for the base station mobile station communication in the mobile station direct communication.
- a synchronization means for synchronizing a frame in base station mobile station communication with a frame in mobile station direct communication based on control information used in base station mobile station communication
- base station 30 or mobile station 40 Allocating means for allocating the band and frequency of direct communication between mobile stations according to the allocation request from the base station, Since the communication control information 55 is configured to synchronize the frames of the base station mobile station communication and the mobile station direct communication by using the control information 55 instead of the conventional control information by the mobile station direct communication, the base station 30 LIN-51 and communication band UP from mobile station 40 to base station 30 UP- LI NK 52 and direct communication band 54 from mobile station 40 to mobile station 40 It can be processed. Therefore, even when performing direct communication between mobile stations at frequencies other than the base station 30, the mobile station can perform direct communication between mobile stations and communication between base stations at the same time, or the mobile station
- the load on the mobile station can be reduced by the base station controlling the direct communication between the mobile stations.
- the present embodiment is an example in a case where the way of allocating the communication band is changed.
- FIG. 7 is a control sequence diagram illustrating a data flow in the wireless communication system according to the second embodiment of the present invention.
- FIG. 8 is a block diagram showing band allocation in the present wireless communication system, and corresponds to FIG.
- base station 30 and mobile station 4 OA mobile station x 1), mobile station 40 B (mobile station 2)), mobile station 40C (mobile station 3>) is in a state where the communication line is open (number 80).
- the mobile station 40C (mobile station ⁇ 3>) transmits a communication band request (number 81) with the base station, and mobile station 4OA (mobile station ⁇ 1>) transmits to mobile station 40B (mobile station ⁇ 2>).
- the central controller 31 sets the bandwidth as a communication bandwidth between the base station 30 and the mobile station 40C (mobile station K3>).
- (Band D 1) and band 93 (band U1) are allocated (number 83), and band 94 (band 2) is used as the communication band between mobile station 40A (mobile station 1>) and mobile station 40B (mobile station 2>).
- Reference numeral 91 denotes control information.
- base station 3 mobile station 40 C (communication of mobile station ⁇ 3 » Perform (No. 85) and (No. 87), and perform communication (No. 86) and (No. 88) between mobile station 4 OA (Mobile station ⁇ 1>) and mobile station 40B (Mobile station ⁇ 2>).
- base station 30 performs direct communication between mobile station 4 OA (mobile station 1) and mobile station 40B (mobile station 2) outside the frequency of base station 30.
- the base station 30 can communicate with the mobile station 40 C (mobile station 3>) by instructing the mobile station 40 to perform this operation.
- the base station 30 when the direct communication between mobile station 4 OA (mobile station 1) and mobile station 40B (mobile station ⁇ 2> is performed at the same frequency as base station 30), although the base station 30 cannot transmit and receive data, by using another frequency, the base station 30 can transmit and receive data in the entire band (time) in the frame.
- FIG. 9 is a block diagram showing frame allocation in the wireless communication system according to the third embodiment of the present invention, in which the frequency of base station-mobile communication and the frequency of direct communication between mobile stations are allocated to frames. It is an example.
- base station 30 broadcasts frame synchronization and band allocation using control information 100.
- Down— 1 ⁇ ! 11 ⁇ Phase 01 (number 101), D 2 (number 102), D 3 (number 104), D4 (number 103) are from base station 30 to mobile station 4 OA (mobile station 1>), mobile This is the transmission allocation band for station 40B (mobile station 2>), mobile station 40C (mobile station 3>), and mobile station 40D (mobile station 4>) (not shown in FIG. 3).
- Up—1 ink phases U1 (number 107), U2 (108), U3 (number 106), and U4 (number 105) are mobile station 40A (mobile station 1>) and mobile station 40, respectively.
- B mobile station 2>
- mobile station 40C mobile station 3>
- mobile station 40D mobile station 4>
- A1 (number 1 09) is the allocated band for direct communication between mobile station 4 OA (mobile station x 1>) and mobile station 40 B (mobile station x 2)
- the base station 30 broadcasts control information (including band allocation information) for frame synchronization, transmits information to each mobile station in Dl, D2, D3, and D4, and transmits Ul, U2, U3, U4 receives information from each mobile station.
- control information including band allocation information
- the base station 30 broadcasts control information (including band allocation information) for frame synchronization, transmits information to each mobile station in Dl, D2, D3, and D4, and transmits Ul, U2, U3, U4 receives information from each mobile station.
- a communication state of about 4 frames is shown assuming that there is no change in the allocation.
- the mobile station 4 OA receives control information from the base station 30, receives information from the base station 30 at D1, and transmits information to the base station 30 at U1. Further, as shown in the second and third frames from the beginning, mobile station 4 OA (mobile station x 1>) is assigned mobile station 40 B (mobile station x 2>) and base station 4 in allocation A1. Direct communication is performed using a frequency different from the mobile station communication frequency.
- the mobile station 4 OA (mobile station x 1>) can simultaneously communicate directly with the mobile station 40 B (mobile station x 2>) while communicating with the base station 30.
- the base station 30 since direct communication is performed at a different frequency, the base station 30 also communicates with the mobile station 40C (mobile station ⁇ 3>) and the mobile station 40D (mobile station 4) during direct communication. It can be performed.
- FIG. 11 is a block diagram showing frame allocation in the wireless communication system according to the fourth embodiment of the present invention, in which the frequency of the communication between the base station and the mobile station and the frequency of the direct communication between the mobile stations are different from each other. It is an allocation example.
- control information for frame synchronization (number 110) is used for the frequency of communication between base stations and mobile stations.
- Down-1 ink phases D1 (number 1 1 1), D 2 (number 1 12), D 3 (number 1 14), D4 (number 1 13) are respectively Base station to mobile station 4 OA (mobile station 1>), mobile station 4 OB (mobile station 2>), mobile station 40C (mobile station 3 » mobile station 40D (mobile station 4>) (Not shown in Fig.
- FIG. 12 is a diagram showing an example of the communication status of the base station and the mobile station in the present wireless communication system, and shows the communication status of each communication terminal assigned in FIG.
- mobile station 4 OA mobile station ⁇ 1>
- mobile station 4 OA mobile station ⁇ 1>
- mobile station 4 OA mobile station ⁇ 1>
- central controller 31 (FIG. 3) allocates direct communication in a band other than D1.
- the central controller 31 calculates a combination for performing base station mobile station communication and direct communication between mobile stations based on the bandwidth allocation request of each mobile station and base station, and as shown in FIG.
- the base station 30 performs efficient allocation to use the wireless band to the maximum, notifies the base station 30 and notifies each mobile station.
- By performing such centralized control it is possible to use the frequency completely without leaving a waiting time for avoiding signal collision in a decentralized autonomous system such as IEEEE 802, 11, and to provide a mobile station.
- a single central controller 31 manages the request for direct communication between base stations and the request for communication between base stations and mobile stations, so that transmission and reception can be performed without any conflict.
- the base station 30, the mobile station 40 wirelessly connected to the base station 30, and the mobile station 40 installed in the base station 30 are provided in the communication frequency frame in response to a band allocation request.
- This example is applied to a wireless communication system including a central control device 31 that allocates a band, but is applicable to any TDMA wireless communication device. Is available. For example, it can be applied to a cordless telephone in which a master unit and a plurality of slave units are connected by wireless communication, a PDA (Personal Digital Assistant) having a wireless communication function, and a small notebook computer.
- a PDA Personal Digital Assistant
- the wireless communication system is configured by a plurality of identical wireless terminals having both a base station and a mobile station function in the form of a master that performs communication management and a slave that follows the instructions of the master, and the wireless terminal May be a wireless communication system that is in charge of base station operation and mobile station operation, respectively.
- the wireless communication system of the present invention can perform direct communication between mobile stations and communication between base stations and mobile stations simultaneously when performing direct communication between mobile stations at frequencies other than the base station frequency, or Direct communication between mobile stations can be performed with the connection maintained.
- the load on the mobile station can be reduced by the base station controlling the direct communication between the mobile stations.
- the base station can operate in the time domain in which direct communication between mobile stations is performed.
- An efficient wireless communication system can be realized by using a plurality of frequencies in one base station for communication, such as capable of transmitting and receiving data.
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Description
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Priority Applications (11)
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EP01271022A EP1343340B1 (en) | 2000-12-11 | 2001-11-30 | Radio communication system |
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US15/922,328 US20180206216A1 (en) | 2000-12-11 | 2018-03-15 | Wireless communication system |
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Also Published As
Publication number | Publication date |
---|---|
US8369309B2 (en) | 2013-02-05 |
US8270390B2 (en) | 2012-09-18 |
US20130114475A1 (en) | 2013-05-09 |
US20040048609A1 (en) | 2004-03-11 |
US20150171981A1 (en) | 2015-06-18 |
US20180206216A1 (en) | 2018-07-19 |
US9955468B2 (en) | 2018-04-24 |
CN1478366A (zh) | 2004-02-25 |
US9258074B2 (en) | 2016-02-09 |
EP1343340A1 (en) | 2003-09-10 |
JP4625611B2 (ja) | 2011-02-02 |
JPWO2002049387A1 (ja) | 2004-04-15 |
DE60128132D1 (de) | 2007-06-06 |
EP1343340B1 (en) | 2007-04-25 |
US20130215880A1 (en) | 2013-08-22 |
US20110286369A1 (en) | 2011-11-24 |
CN1312955C (zh) | 2007-04-25 |
EP1343340A4 (en) | 2005-09-28 |
US9025528B2 (en) | 2015-05-05 |
DE60128132T2 (de) | 2007-12-27 |
US20120307692A1 (en) | 2012-12-06 |
US20160112999A1 (en) | 2016-04-21 |
US8570950B2 (en) | 2013-10-29 |
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