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WO2013140528A1 - Dispositif de station de base, dispositif de station mobile, système de communication et procédé de communication - Google Patents

Dispositif de station de base, dispositif de station mobile, système de communication et procédé de communication Download PDF

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Publication number
WO2013140528A1
WO2013140528A1 PCT/JP2012/057076 JP2012057076W WO2013140528A1 WO 2013140528 A1 WO2013140528 A1 WO 2013140528A1 JP 2012057076 W JP2012057076 W JP 2012057076W WO 2013140528 A1 WO2013140528 A1 WO 2013140528A1
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WO
WIPO (PCT)
Prior art keywords
cell
mobile station
base station
user traffic
station apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/057076
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English (en)
Japanese (ja)
Inventor
裕 磯沼
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Fujitsu Ltd
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Fujitsu Ltd
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Publication date
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Priority to PCT/JP2012/057076 priority Critical patent/WO2013140528A1/fr
Publication of WO2013140528A1 publication Critical patent/WO2013140528A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the embodiments discussed herein relate to the formation of cells used for mobile communications.
  • a first base station that forms a first cell and can communicate with a mobile station, and a second base station that forms a second cell and can communicate with the mobile station Mobile communication systems have been proposed.
  • the first base station can transmit the first radio signal including the same cell information regarding the first cell a plurality of times.
  • the second base station receives the first radio signal including the same cell information at least once, and the cell information included in the received first radio signal is valid until a predetermined time has elapsed or until a predetermined time. To do.
  • the second base station adjusts radio parameters related to the second cell based on the cell information.
  • the capacity of traffic per cell may be insufficient.
  • the amount of user traffic accommodated per cell can be reduced by reducing the coverage range of each cell and increasing the cell arrangement density to reduce the number of mobile station apparatuses accommodated per cell.
  • HO processing involves transmission and reception of control messages, radio resources are consumed. As the coverage area of one cell becomes smaller, HO processing increases. For this reason, an increase in radio resources used for the HO processing may reduce the amount of radio resources that can be used for user traffic, and may reduce the utilization efficiency of radio resources.
  • the disclosed apparatus, system, and method alleviate an increase in HO processing due to a reduction in the coverage range of a cell that accommodates user traffic.
  • a base station device allocates radio resources of radio signals transmitted in the first cell to control signal transmission with the mobile station apparatus, and allocates radio resources of radio signals transmitted in a second cell different from the first cell. And a scheduler assigned to transmission of user traffic to and from the mobile station apparatus.
  • the base station apparatus includes a signal transmission / reception unit that transmits and receives control signals and user traffic to and from the mobile station apparatus in accordance with radio resource allocation by the scheduler.
  • a mobile station device includes a scheduling information detection unit that detects scheduling information.
  • the scheduling information designates a second cell different from the first cell, which is used for transmission of user traffic with the base station apparatus, from a radio signal transmitted in the first cell.
  • the scheduling information specifies a radio resource of a radio signal transmitted in the second cell allocated for transmission of user traffic.
  • the mobile station apparatus includes a user traffic transmission / reception unit that transmits / receives user traffic using radio resources of radio signals transmitted in the second cell, which are designated by the scheduling information.
  • a communication system includes a base station device and a mobile station device.
  • the base station apparatus allocates radio resources of radio signals transmitted in the first cell to control signal transmission with the mobile station apparatus, and allocates radio resources of radio signals transmitted in a second cell different from the first cell.
  • a scheduler assigned to transmission of user traffic to and from the mobile station apparatus is provided.
  • the base station apparatus includes a control signal transmission unit that transmits scheduling information in the first cell. The scheduling information specifies a radio resource allocated by the scheduler for transmission of user traffic and a second cell used for transmission of user traffic.
  • the base station apparatus includes a control signal transmission unit that transmits in the first cell and a user traffic transmission / reception unit that transmits and receives user traffic to and from the mobile station apparatus according to radio resource allocation by the scheduler.
  • the mobile station apparatus includes a scheduling information detection unit that detects scheduling information from a radio signal transmitted in the first cell.
  • the mobile station apparatus includes a user traffic transmission / reception unit that transmits / receives user traffic using radio resources of radio signals transmitted in the second cell, which are designated by the scheduling information.
  • a communication method is given.
  • radio resources of radio signals transmitted in the first cell are allocated to control signal transmission between the base station apparatus and the mobile station apparatus.
  • radio resources of radio signals transmitted in a second cell different from the first cell are allocated to transmission of user traffic between the base station apparatus and the mobile station apparatus.
  • an increase in HO processing is reduced even if the coverage range of a cell that accommodates user traffic is reduced.
  • FIG. 1 is a diagram illustrating a configuration example of a communication system.
  • the communication system 1 includes base station devices 2 a and 2 b and a mobile station 3.
  • a base station device and a mobile station device may be referred to as a base station and a mobile station, respectively.
  • the base stations 2a and 2b may be collectively referred to as the base station 2.
  • the base station 2 is a radio station device that relays between a mobile station 3 of a user who receives a mobile communication service and a fixed communication network in accordance with a predetermined radio communication standard.
  • the wireless communication standard of the base station 2 may be, for example, a W-CDMA (Wideband Code Division Multiple Access) system or an LTE (Long Term Evolution) system.
  • the mobile station 3 is a terminal device used for communication via the Internet such as the Web or communication such as voice via a public line / other mobile communication network.
  • the base station 2a includes a first cell 5a for transmitting a control signal to and from the mobile station 3, and second cells 6a and 6b for transmitting user traffic to and from the mobile station 3. Form separately.
  • the base station 2b separately forms a first cell 5b for transmitting control signals to and from the mobile station 3 and a second cell 6c for transmitting user traffic to and from the mobile station 3. .
  • the first cells 5a and 5b may be referred to as C-plane cells 5a and 5b.
  • the second cells 6a to 6c may be referred to as U-plane cells 6a to 6c.
  • the C plane cells 5a and 5b may be collectively referred to as the C plane cell 5.
  • the U plane cells 6a to 6c may be collectively referred to as a U plane cell 6.
  • the base station 2a of this embodiment includes radio devices (RE: “Radio” Equipment) 4a and 4b.
  • the base station 2b includes a wireless device 4c.
  • the radio apparatuses 4a to 4c include a communication interface with the base station 2, a digital-analog converter, a digital-analog converter, a frequency converter, a transmission amplifier, a transmission amplifier, and a reception amplifier.
  • the wireless communication with the mobile station 3 is relayed.
  • An example of the wireless devices 4a to 4c is, for example, a remote radio head (RRH: “Remote Radio Radio Head”).
  • the base station 2a forms coverage by the relay of the wireless devices 4a and 4b as U cells 6a and 6b, and the base station 2b forms coverage by the relay of the wireless device 4c as the U cell 6c.
  • the wireless devices 4a to 4c may be collectively referred to as the wireless device 4.
  • the base station 2 may form the C cell 5 by coverage by relay of the wireless device 4.
  • the base station 2 may form the U cell 6 with the coverage of the base station 2 itself.
  • the coverage range of one U plane cell 6 is smaller than the coverage range of one C plane cell 5.
  • a control signal used for connection connection between the mobile station 3 and the base station 2 is transmitted and received in the C plane cell 5.
  • the HO process for maintaining the connection between the mobile station 3 and the base station 2 is performed when the mobile station 3 moves between the C plane cells 5. Therefore, by making the C plane cell 5 larger than the U plane cell 6, even if the U plane cell 6 is downsized, radio resource consumption due to an increase in HO processing is reduced.
  • the recent increase in the traffic volume of the entire network is due to the increase in user traffic, and the increase in control signals is small compared to the increase in user traffic. Therefore, if the cell that transmits the control signal is reduced in accordance with the reduction of the cell that transmits the user traffic, the control signal processing capability in the base station 2 is left.
  • the C plane cell 5 larger than the U plane cell 6, even if the U plane cell 6 is reduced, the reduction in the number of mobile stations 3 per base station 2 is reduced, and the control signal processing in the base station 2 is reduced. It is possible to prevent excess capacity.
  • the control signal processing in the C plane cell 5a and the user traffic processing in the U plane cells 6a and 6c included in the coverage of the C plane cell 5a are performed by the same base station 2a. That is, the U plane cells 6a and 6c in which user traffic is processed by a certain base station 2a are included in the coverage of the C plane cell 5a in which control signals are processed by the same base station 2a.
  • control signal processing in the C plane cell 5b and user traffic processing in the U plane cell 6c included in the coverage of the C plane cell 5b are performed by the same base station 2a.
  • the coverage of the U plane cell 6a or 6b included in a certain C plane cell 5a does not necessarily have to be included in the C plane cell 5a.
  • the partial range of the U plane cell 6a or 6b may be outside the C plane cell 5a, and the connection with a certain base station 2a may not be maintained.
  • the C-plane cells 5a and 5b use the carrier frequency f1
  • the U-plane cells 6a to 6c use a carrier frequency f2 different from f1.
  • the same carrier frequency is used in the C plane cell 5 and the U plane cell 6. May be.
  • CDMA Code Division Multiple Access
  • control signals passing through the following channels are transmitted / received in the C plane cell 5.
  • PRACH Physical Random Access Channel
  • PUCCH Physical Uplink Control Channel
  • PDCCH Physical Downlink Control Channel
  • CCCH Common Control Channel
  • DCCH Dedicated Control Channel
  • PCCH Paging Control Channel
  • BCCH Broadcast Control Channel
  • CCCH Physical Uplink Shared Channel
  • PDSCH Physical Uplink Shared Channel
  • the base station 2 transmits cell notification information as broadcast information via the BCCH.
  • the cell notification information is information for notifying the U plane cell 6 formed by the base station 2.
  • FIG. 2 shows an example of cell notification information.
  • the cell notification information of an embodiment may include information elements “cell identifier” and “frequency”.
  • the information element “cell identifier” is an identifier of the U-plane cell 6 formed by the base station 2.
  • the information element “frequency” indicates the carrier frequency in each U-plane cell 6.
  • the cell notification information may be transmitted as one of SIB (System Information Block), for example.
  • the base station 2 transmits cell notification information of all U plane cells 6 formed by the base station 2.
  • the mobile station 3 acquires cell notification information from the received broadcast information.
  • the base station 2 inserts a reference signal and a synchronization signal including a pattern unique to each U plane cell 6 into a radio signal transmitted to the U plane cell 6.
  • the reference signal includes a pattern specific to each U-plane cell 6, and the mobile station 3 can identify the U-plane cell 6 based on the reference signal.
  • the synchronization signal is a signal whose position is determined in the time domain, and the mobile station 3 can perform symbol synchronization based on the synchronization signal.
  • the mobile station 3 When starting communication, the mobile station 3 connects to the base station 2 by transmitting and receiving control signals in the C plane cell 5. The mobile station 3 detects the U plane cell 6 to which the received reference signal is transmitted based on the reception result of the reference signal transmitted from the U plane cell 6. The mobile station 3 measures the reception strength of the reference signal for each U plane cell 6. The mobile station 3 selects the upper predetermined number of U-plane cells 6 having higher reception strength.
  • the mobile station 3 transmits cell quality information including the identifier and reception strength of the selected U-plane cell 6 to the base station 2 as an RRC (Radio Resource Control) protocol message via the DCCH.
  • FIG. 3 shows an example of cell quality information.
  • the cell quality information includes information elements “message type”, “number of cells”, and “cell information”.
  • the information element “message type” is an identifier indicating that this message is cell quality information.
  • the information element “number of cells” indicates how many cells the cell quality information includes.
  • Each of the information elements “cell information” further includes an information element “identifier” and “reception strength”.
  • the cell quality information includes an information element “cell information” corresponding to the number of values of the information element “number of cells”.
  • the information elements “identifier” and “reception strength” indicate the identifier and reception strength of the U-plane cell 6 selected by the mobile station.
  • the base station 2 selects the U plane cell 6 used for communication with the mobile station 3 from the U plane cells 6 specified by the cell quality information. In the following description, it is assumed that U-plane cells 6a and 6b are available. The base station 2 determines radio resources to be allocated for communication with the mobile station 3 from the available radio resources in both the U plane cells 6a and 6b.
  • the base station 2 transmits resource information specifying the assigned radio resource in the C plane cell 5 using PDCCH.
  • the schedule information may include a cell identifier of the U plane cell 6 used for transmission of user traffic between the base station 2 and the mobile station 3, and an identifier of a radio resource.
  • the radio resource identifier may include, for example, a channel number and a slot number used for transmission.
  • FIG. 4 is an explanatory diagram of an example of scheduling information.
  • scheduling information for downlink to the mobile station 3 is transmitted in the third slot on the PDCCH which is a control signal channel.
  • the PDCCH which is a control signal channel.
  • n channels for user traffic transmission are prepared in the PDSCH, and each channel has 15 slots.
  • the scheduling information shown in the figure indicates that downlink user traffic to the mobile station 3 is transmitted in the twelfth slot of the first channel of the U plane cell 6b.
  • the mobile station 3 acquires scheduling information assigned to the mobile station 3 from the PDCCH.
  • the mobile station 3 acquires user traffic by descrambling a signal transmitted using the radio resource specified by the scheduling information using a scrambling code unique to the U-plane cell 6b.
  • the mobile station 3 scrambles the encoded uplink user traffic using a scramble code unique to the U-plane cell 6b, and transmits the scrambled code using radio resources specified by the scheduling information.
  • scrambling user traffic with a scramble code unique to the U-plane cell 6b interference between the U-plane cells 6 can be removed, and signals transmitted in the U-plane cells 6 can be distinguished.
  • FIG. 5 is a diagram illustrating an example of a hardware configuration of the mobile station 3.
  • the hardware configuration illustrated in FIG. 5 is one example of a hardware configuration that implements the mobile station 3. Any other hardware configuration may be adopted as long as it performs the operations described below.
  • the mobile station 3 includes a processor 10, a memory 11, an LSI (Large Scale Integration) 12, a wireless communication circuit 13, an interface circuit 14, an input device 15, and an output device 16.
  • the interface circuit is denoted as “I / F”.
  • the processor 10 executes information processing of application software used by the user of the mobile station 3 and communication protocol processing for wireless communication with the base station 2 by executing a computer program stored in the memory 11. To do.
  • the memory 11 stores a computer program executed by the processor 10 and data used for the execution.
  • the memory 11 may include a non-volatile storage device for storing programs and data, and a random access memory (RAM: “Random Access” Memory) for storing temporary data.
  • the LSI 12 executes baseband signal processing of radio signals with the base station 2 transmitted and received by the radio communication circuit 13.
  • the LSI 12 may be, for example, an FPGA (Field-Programming Gate Array), an ASIC (Application Specific Integrated Circuit), a DSP (Digital Signal Processor), or the like.
  • the radio communication circuit 13 transmits and receives radio signals between the mobile station 3 and the base station 2.
  • the interface circuit 14 is an interface circuit between the processor 10 and the following input device 15 and output device 16.
  • the input device 15 is an input device that accepts an input operation by a user.
  • the input device 15 may be, for example, a keypad, a keyboard, a pointing device, a touch panel, or the like.
  • the output device 16 is an output device that outputs a signal processed by the mobile station apparatus 3.
  • the output device 16 may be a display device that visually displays information processed by the mobile station device 3 to the user.
  • This display device may be, for example, a liquid crystal display or an organic electroluminescence display.
  • the output device 16 may be a speaker that outputs an audio signal or a drive circuit thereof.
  • FIG. 6 is an example of a functional block diagram of the mobile station 3.
  • the mobile station 3 may include other components than the illustrated components.
  • the mobile station 3 includes a C plane signal processing unit 20, a U plane signal processing unit 21, a communication control unit 22, a communication processing unit 23, and an application processing unit 24.
  • a solid line indicates the flow of user traffic and control signals transmitted to and received from the base station 2, and a broken line indicates the flow of control signals used in the mobile station 3.
  • the following operations of the communication control unit 22, the communication processing unit 23, and the application processing unit 24 are executed by the processor 10 shown in FIG.
  • the operations of the C plane signal processing unit 20 and the U plane signal processing unit 21 are executed by the cooperation of the LSI 12 and the wireless communication circuit 13.
  • the C-plane signal processing unit 20 performs radio signal transmission / reception processing, encoding processing, decoding processing, modulation processing, and demodulation processing of control signals transmitted and received in the C-plane cell 5.
  • the U plane signal processing unit 21 performs transmission / reception processing, encoding processing, decoding processing, modulation processing, and demodulation processing of radio signals of user traffic transmitted and received in the U plane cell 6.
  • the U plane signal processing unit 21 identifies the U plane cell 6 that can be used by the mobile station 3 based on the reference signal and the synchronization signal transmitted for each U plane cell 6, symbol synchronization, and the U plane cell.
  • the reception strength measurement at 6 is performed.
  • the U plane signal processing unit 21 outputs the detected identifier of the U plane cell 6 and the reception strength measurement result to the application processing unit 24.
  • the U plane signal processing unit 21 receives from the application processing unit 24 a scramble code used in the U plane cell 6 through which user traffic is transmitted and received.
  • the U-plane signal processing unit 21 performs a scramble process and a descrambling process with the scramble code specified by the application processing unit 24 in the encoding process and decoding process of user traffic.
  • the communication control unit 22 performs termination processing of PUCCH, PRACH, and PDCCH, and transmission control and reception control of signals transmitted and received by the communication processing unit 23.
  • the communication control unit 22 acquires schedule information indicating radio resources allocated on the PDSCH for downlink communication from the PDCCH.
  • the communication control unit 22 outputs the schedule information to the communication processing unit 23, the C plane signal processing unit 20, and the U plane signal processing unit 21.
  • the communication control unit 22 In uplink communication, upon receiving a signal transmission request from the communication processing unit 23, the communication control unit 22 sends an uplink radio resource allocation request used for signal transmission to the base via the C plane signal processing unit 20. Transmit to station 2.
  • the radio resource allocation request is transmitted via the PUCCH.
  • the communication control unit 22 acquires schedule information indicating radio resources allocated on the PUSCH for uplink communication from the PDCCH.
  • the communication control unit 22 outputs the schedule information to the communication processing unit 23, the C plane signal processing unit 20, and the U plane signal processing unit 21.
  • the communication processing unit 23 transmits / receives control signals and user traffic to / from the application processing unit 24 and PUSCH and PDSCH termination processing.
  • the communication processing unit 23 receives the PDSCH from the C plane signal processing unit 20 and / or the U plane signal processing unit 21 according to the schedule information output from the communication control unit 22. Further, the communication processing unit 23 outputs a control signal and user traffic transmitted on the PDSCH to the application processing unit 24.
  • the communication processing unit 23 When receiving a control signal and / or user traffic from the application processing unit 24 in the uplink, the communication processing unit 23 outputs a signal transmission request to the communication control unit 22.
  • a transmission instruction from the communication control unit 22 is received, a PUSCH signal containing a control signal and / or user traffic is output to the C plane signal processing unit 20 and / or the U plane signal processing unit 21.
  • the C plane signal processing unit 20 and the U plane signal processing unit 21 transmit a PUSCH signal using radio resources specified by the schedule information in accordance with the schedule information output from the communication control unit 22.
  • the communication processing unit 23 detects cell notification information transmitted from the base station 2 as broadcast information via BCCH.
  • the communication processing unit 23 transmits cell notification information to the application processing unit 24.
  • the application processing unit 24 executes information processing of application software used by the user of the mobile station 3, transmission / reception of user traffic on the logical channel, and communication protocol processing for wireless communication with the base station 2.
  • the application processing unit 24 When receiving the cell notification information from the communication processing unit 23, the application processing unit 24 outputs the identifiers and carrier frequency information of all the U plane cells 6 formed by the base station 2 to the U plane signal processing unit 21.
  • the U plane signal processing unit 21 performs identification of the U plane cell 6, symbol synchronization, and reception intensity measurement in the U plane cell 6 based on the identifier of the U plane cell 6 and information on the carrier frequency.
  • the application processing unit 24 selects the upper predetermined number of U plane cells 6 having higher reception strength based on the measurement result of the reception strength by the U plane signal processing unit 21.
  • the application processing unit 24 generates cell quality information including the identifier and reception strength of the selected U plane cell 6.
  • the application processing unit 24 transmits an RRC protocol message notifying cell quality information to the base station 2 via the communication processing unit 23 and the C plane signal processing unit 20.
  • the application processing unit 24 selects a scramble code to be used for scrambling user traffic from known scramble codes designated in advance for each U-plane cell 6.
  • the application processing unit 24 outputs the selected scramble code to the U plane signal processing unit 21.
  • FIG. 7 is a diagram illustrating an example of a hardware configuration of the base station 2.
  • the hardware configuration illustrated in FIG. 7 is an example of a hardware configuration that implements the base station 2. Any other hardware configuration may be adopted as long as it performs the operations described below.
  • the base station 2 includes a processor 30, an auxiliary storage device 31, a memory 32, an LSI 33, a wireless communication circuit 34, and a network interface circuit 35.
  • the network interface circuit is referred to as “NIF circuit”.
  • the processor 30 executes a computer program stored in the auxiliary storage device 31 to execute control of the base station 2 and communication protocol processing for wireless communication with the mobile station 3.
  • the auxiliary storage device 31 stores a computer program executed by the processor 30 and data used for the execution.
  • the auxiliary storage device 31 may include a nonvolatile memory, a read-only memory (ROM: “Read” Only ”Memory), a hard disk, and the like as storage elements.
  • the memory 32 stores a program currently being executed by the processor 30 and data temporarily used when the program is executed.
  • the memory 32 may include a random access memory.
  • the LSI 33 performs baseband signal processing of radio signals with the mobile station 3 in the C plane cell 5 transmitted and received by the radio communication circuit 34 and radio signals with the mobile station 3 in the U plane cell 6 transmitted and received by the radio apparatus 4. Execute.
  • the radio communication circuit 34 transmits and receives radio signals between the mobile station 3 and the base station 2 in the C plane cell 5.
  • the network interface circuit 35 is a communication interface circuit for communication with other base stations and higher-level node devices via a fixed communication network.
  • FIG. 8 is an example of a functional block diagram of the base station 2.
  • the base station 2 may include other components other than the illustrated components.
  • the base station 2 includes a C plane signal processing unit 40, a U plane signal processing unit 41, a communication control unit 42, a communication processing unit 43, and an application processing unit 44.
  • the solid line indicates the flow of user traffic and control signals transmitted to and received from the mobile station 3, and the broken line indicates the flow of control signals used in the base station 2.
  • the following operations of the communication control unit 42, the communication processing unit 43, and the application processing unit 44 are executed by the processor 30 shown in FIG.
  • the operation of the C plane signal processing unit 40 is executed by the cooperation of the LSI 33 and the wireless communication circuit 34.
  • the operation of the U plane signal processing unit 21 is executed by the cooperation of the LSI 33 and the wireless device 4.
  • the C plane signal processing unit 40 performs radio signal transmission / reception processing, encoding processing, decoding processing, modulation processing, and demodulation processing of control signals transmitted and received in the C plane cell 5.
  • the U plane signal processing unit 41 performs transmission / reception processing, encoding processing, decoding processing, modulation processing, and demodulation processing of radio signals of user traffic transmitted / received in the U plane cell 6.
  • the U plane signal processing unit 41 inserts a cell-specific reference signal and a synchronization signal into the radio signal transmitted by each U plane cell 6.
  • the U plane signal processing unit 41 receives a scramble code used in the U plane cell 6 through which user traffic is transmitted and received from the application processing unit 44.
  • the U-plane signal processing unit 41 performs scramble processing and descrambling processing with the scramble code specified by the application processing unit 44 in the encoding processing and decoding processing of user traffic.
  • the communication control unit 42 performs termination processing of PUCCH, PRACH, and PDCCH, and transmission control and reception control of signals transmitted and received by the communication processing unit 43.
  • the communication control unit 42 determines a cell and radio resource to be used for transmission, and generates schedule information.
  • the transmission signal is a control signal
  • the communication control unit 42 uses the C plane cell 5 for transmission.
  • the communication control unit 42 uses one of the U plane cells 6 specified in the cell quality information received from the mobile station 3 for transmission.
  • the communication control unit 42 may preferentially use a cell with higher reception strength.
  • the communication control unit 42 transmits schedule information to the mobile station 3 via the C plane signal processing unit 40 using PDCCH.
  • the communication control unit 42 notifies the communication processing unit 43 of schedule information.
  • the communication control unit 42 notifies the C plane signal processing unit 40 of the schedule information if the transmission signal is a control signal, and notifies the U plane signal processing unit 41 of the schedule information if the transmission signal is user traffic.
  • the C plane signal processing unit 40 transmits the control signal output from the communication control unit 42 according to the schedule information.
  • the U plane signal processing unit 41 transmits user traffic output from the communication control unit 42 according to the schedule information.
  • the communication control unit 42 detects an uplink radio resource allocation request by the mobile station 3 from the PUCCH.
  • the communication control unit 42 determines a cell and a radio resource used for receiving an uplink signal from the mobile station 3, and generates schedule information.
  • the communication control unit 42 uses the C plane cell 5 for reception if the received signal is a control signal. If the received signal is user traffic, the communication control unit 42 uses one of the U plane cells 6 specified in the cell quality information received from the mobile station 3 for reception. When there are free radio resources in the plurality of U plane cells 6 specified in the cell quality information, the communication control unit 42 may preferentially use a cell with higher reception strength.
  • the communication control unit 42 transmits schedule information to the mobile station 3 via the C plane signal processing unit 40 using PDCCH.
  • the communication control unit 42 notifies the communication processing unit 43 of schedule information.
  • the communication control unit 42 notifies the C plane signal processing unit 40 of the schedule information if the received signal is a control signal, and notifies the U plane signal processing unit 41 of the schedule information if the received signal is user traffic.
  • the C plane signal processing unit 40 detects the control signal transmitted by the mobile station 3 from the radio resource indicated by the schedule information.
  • the U plane signal processing unit 41 detects user traffic from the radio resource indicated by the schedule information.
  • the communication control unit 42 transmits cell notification information via BCCH.
  • the communication processing unit 43 performs PUSCH and PDSCH termination processing, and transmission and reception of control signals and user traffic between the application processing unit 44.
  • the communication processing unit 43 In the downlink, when receiving a control signal and / or user traffic from the application processing unit 44, the communication processing unit 43 outputs a signal transmission request to the communication control unit 42.
  • a PDSCH signal containing a control signal and / or user traffic is output to the C plane signal processing unit 40 and / or the U plane signal processing unit 41.
  • the C plane signal processing unit 40 and the U plane signal processing unit 41 transmit the PDSCH signal using radio resources specified by the schedule information in accordance with the schedule information output from the communication control unit 42.
  • the communication processing unit 43 receives the PUSCH from the C plane signal processing unit 40 and / or the U plane signal processing unit 41 in accordance with the schedule information output from the communication control unit 42.
  • the communication processing unit 43 outputs the control signal and user traffic transmitted by the PUSCH to the application processing unit 44.
  • the application processing unit 44 executes control of the base station 2, transmission / reception of user traffic on the logical channel, and communication protocol processing for wireless communication with the mobile station 3. Further, the application processing unit 44 receives an RRC protocol message for notifying cell quality information from the mobile station 3 via the C plane signal processing unit 40 and the communication processing unit 43. The application processing unit 44 notifies the communication control unit 42 of the received cell quality information.
  • the application processing unit 44 selects a scramble code to be used for scrambling user traffic from known scramble codes specified in advance for each U-plane cell 6.
  • the application processing unit 44 outputs the selected scramble code to the U plane signal processing unit 41.
  • FIG. 9 is an explanatory diagram of the operation of the communication system 1 at the time of calling.
  • the series of operations described with reference to FIG. 9 may be interpreted as a method including a plurality of procedures. In this case, “operation” may be read as “step”. The same applies to the operation described with reference to FIG.
  • the base station 2a transmits broadcast information via the BCCH.
  • the broadcast information is transmitted in the C plane cell 5.
  • the communication control unit 42 transmits cell notification information as broadcast information.
  • the mobile station 3 receives cell notification information.
  • the mobile station 3 performs call processing and connection establishment processing with the base station 2 by transmitting and receiving control signals in the C plane cell 5.
  • the U-plane signal processing unit 41 of the base station 2 inserts a cell-specific reference signal and a synchronization signal into the radio signal transmitted by each U-plane cell 6a and 6b. It shows how it is received.
  • the U plane signal processing unit 21 of the mobile station 3 detects the reference signal corresponding to the identifier of the U plane cells 6a and 6b notified by the cell notification information, and identifies the U plane cells 6a and 6b. The U plane signal processing unit 21 performs symbol synchronization in the U plane cells 6a and 6b.
  • the U plane signal processing unit 21 of the mobile station 3 measures the reception strength of the reference signal for each U plane cell 6.
  • the application processing unit 24 of the mobile station 3 transmits an RRC protocol message for notifying cell quality information to the base station 2 in the C plane cell 5.
  • the communication control unit 42 of the base station 2 performs a scheduling process for determining the U-plane cell 6 and radio resources used for transmitting user traffic between the mobile station 3 and the base station 2a.
  • the communication control unit 42 transmits scheduling information by PDCCH. Scheduling information is transmitted in the C plane cell 5.
  • the U-plane cell 6b is used for transmitting user traffic between the mobile station 3 and the base station 2a.
  • User traffic is transmitted between the mobile station 3 and the base station 2a in the U-plane cell 6b designated by the scheduling information in operation AI.
  • the base station 2 changes the cell specified by the scheduling information from the U plane cell 6a to the U plane cell 6b.
  • FIG. 11 is an explanatory diagram of the operation at the time of HO between the C plane cells 5.
  • the HO source base station 2a controls measurement reports regarding mobility of the mobile station 3. Based on this control, the mobile station 3 reports the measurement result to the HO source base station 2a.
  • the HO source base station 2a determines the HO destination candidate base station 2b.
  • the HO source base station 2a transmits a HO request to the base station 2b.
  • the base station 2b performs call admission control. When the call admission is permitted, the base station 2b becomes the HO-destination base station 2b.
  • the base station 2b returns a HO response to the HO request.
  • the HO source base station 2a instructs the mobile station 3 to perform handover.
  • synchronization processing of the physical layer and data link layer such as radio synchronization is executed between the mobile station 3 and the HO destination base station 2b to establish a connection.
  • the base station 2b transmits broadcast information via the BCCH.
  • the broadcast information is transmitted in the C plane cell 5.
  • the broadcast information transmitted at this time includes cell notification information related to the U-plane cell 6c formed by the base station 2b.
  • the mobile station 3 receives cell notification information. Further, the mobile station 3 may acquire the cell notification information related to the U plane cell 6c from the BCCH during the connection establishment process in the operation BG.
  • Operation BI shows a state in which the mobile station 3 receives a signal obtained by inserting a cell-specific reference signal and a synchronization signal into a radio signal transmitted from the U-plane cell 6c by the base station 2b.
  • the mobile station 3 identifies the U plane cell 6c and performs symbol synchronization.
  • the mobile station 3 measures the reception strength of the reference signal of the U plane cell 6c.
  • the mobile station 3 transmits an RRC protocol message notifying cell quality information regarding the U plane cell 6 c to the base station 2 in the C plane cell 5.
  • the coverage range of the U plane cell 6 used for transmitting user traffic is made smaller than the coverage range of the C plane cell 5 used for transmitting control signals.
  • the number of mobile stations 3 per U plane cell 6 can be reduced, and the radio resources that can be used by one mobile station 3 to transmit user traffic can be increased. Thereby, the traffic capacity of the entire network can be increased.
  • the C plane cell 5 is made larger than the U plane cell 6, it is possible to avoid frequent HO processing even if the U plane cell 6 is downsized. For this reason, it is possible to avoid an increase in processing addition and radio resource consumption due to frequent occurrence of HO processing.
  • the C plane cell 5 is made larger than the U plane cell 6, even if the U plane cell 6 that transmits user traffic is reduced, the decrease in the mobile stations 3 accommodated in the base station 2 is reduced. For this reason, it is possible to prevent excess control signal processing capability in the base station 2.
  • the U plane cell 6 may be formed so as to cover the entire C plane cell 5, and may be provided in a spot manner with priority given to a part of the C plane cell 5, for example, an area where user traffic is high. .
  • the application processing unit 24 of the mobile station 3 does not transmit the cell quality information when the reference signal of the U plane cell 6 cannot be detected or when the reception strength is lower than the threshold value. Alternatively, the application processing unit 24 transmits empty cell quality information. When the cell quality information is not transmitted from a certain mobile station 3 or when the cell quality information is empty, the communication control unit 42 of the base station 2 assigns the radio resource of the radio signal transmitted in the C plane cell 5 to the mobile station 3. Allocate user traffic for transmission.
  • the user traffic of the mobile station 3 located in the U plane cell 6 may be allocated from the radio resource of the C plane cell 5. Further, the user traffic of one mobile station 3 may be simultaneously allocated to the radio resources of the C plane cell 5 and the U plane cell 6. A part of the control signal may be transmitted by the U plane cell 6.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Le dispositif de station de base (2) de l'invention comprend : un ordonnanceur (42) servant à attribuer une ressource sans fil pour un signal sans fil émis par une première cellule (5), pour l'émission d'un signal de commande de ou vers un dispositif de station mobile (3), et à attribuer une ressource sans fil pour un signal sans fil émis par une deuxième cellule (6) différente de la première cellule (5), pour l'émission d'un trafic utilisateur de ou vers le dispositif de station mobile (3) ; et un émetteur/récepteur de signal (43) servant à émettre et à recevoir des signaux de commande et un trafic utilisateur de ou vers le dispositif de station mobile (3), selon les attributions de ressources sans fil effectuées par l'ordonnanceur (42).
PCT/JP2012/057076 2012-03-19 2012-03-19 Dispositif de station de base, dispositif de station mobile, système de communication et procédé de communication Ceased WO2013140528A1 (fr)

Priority Applications (1)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0746248A (ja) * 1993-07-30 1995-02-14 Toshiba Corp 無線通信システム
JP2002335569A (ja) * 2001-05-08 2002-11-22 Denso Corp 無線通信システム
JP2006287601A (ja) * 2005-03-31 2006-10-19 Toshiba Corp 移動通信システム及び基地局装置
WO2010126105A1 (fr) * 2009-04-28 2010-11-04 株式会社エヌ・ティ・ティ・ドコモ Système de communication mobile, station de base sans fil, et procédé de commande associé

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0746248A (ja) * 1993-07-30 1995-02-14 Toshiba Corp 無線通信システム
JP2002335569A (ja) * 2001-05-08 2002-11-22 Denso Corp 無線通信システム
JP2006287601A (ja) * 2005-03-31 2006-10-19 Toshiba Corp 移動通信システム及び基地局装置
WO2010126105A1 (fr) * 2009-04-28 2010-11-04 株式会社エヌ・ティ・ティ・ドコモ Système de communication mobile, station de base sans fil, et procédé de commande associé

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