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WO2013031808A1 - Système de communication, procédé de communication, station de base, et station mobile - Google Patents

Système de communication, procédé de communication, station de base, et station mobile Download PDF

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Publication number
WO2013031808A1
WO2013031808A1 PCT/JP2012/071797 JP2012071797W WO2013031808A1 WO 2013031808 A1 WO2013031808 A1 WO 2013031808A1 JP 2012071797 W JP2012071797 W JP 2012071797W WO 2013031808 A1 WO2013031808 A1 WO 2013031808A1
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WIPO (PCT)
Prior art keywords
mobile station
radio signal
scell
communication
enb
Prior art date
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Ceased
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PCT/JP2012/071797
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English (en)
Japanese (ja)
Inventor
下鍋　忠
鈴木　康生
充 坂本
佑介 高木
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Sharp Corp
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Sharp Corp
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Publication of WO2013031808A1 publication Critical patent/WO2013031808A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point

Definitions

  • the present invention relates to a communication system, a communication method, a base station, and a mobile station capable of transmitting and receiving a plurality of independent radio signals having different frequencies.
  • LTE Long Term Evolution: long-term evolution (third generation)
  • LTE-A Long-term evolution
  • LTE-A is required to realize higher speed and larger capacity communication than LTE. Therefore, LTE-A is supposed to support a wider frequency range than LTE. According to the studies up to now, the maximum transmission bandwidth of LTE is 20 MHz, whereas the maximum transmission bandwidth of LTE-A is extended to 100 MHz.
  • CA carrier aggregation
  • the component carrier used in communication using carrier aggregation is allocated in a UE-specific manner by the base station at the start of communication or when resetting.
  • a serving cell that communicates with a mobile station includes a combination of one PCell (Primary Serving Cell) and one or more SCells (Secondary Serving Cell).
  • the component carrier corresponding to PCell is called PCC (Primary Component Carrier)
  • the component carrier corresponding to SCell is called SCC (Secondary Component Carrier) (refer to “7.5 Carrier Aggregation” in Non-Patent Document 1). .
  • SCC includes a “configure state” and a “non-configure state” as state values. Furthermore, the configuration state includes “activate” and “deactivate”.
  • radio quality such as CQI (Channel Quality Indicator) is measured so that communication can be started immediately, but communication in an individual channel is not performed.
  • CQI Channel Quality Indicator
  • the base station determines that the radio quality of the SCell has improved based on the report from the mobile station regarding the radio quality in the deactivated SCell, the base station changes the SCell to activate. Then, the communication with the mobile station in SCell is started.
  • Non-Patent Documents 1 and 2 if a radio link failure (hereinafter also referred to as “RLF”) occurs during carrier aggregation in LTE-A, the RRC_Connection_Reestablishment procedure may be started. It is described as a specification. At this time, it is specified to release SCell_Configuration, which is information for setting the SCell in the configuration state.
  • RLF radio link failure
  • the present invention has been made to solve such a problem, and its purpose is to avoid unnecessary resource consumption even when carrier aggregation disabled due to some trouble is reconfigured. At the same time, it is to provide a communication system, a communication method, a base station, and a mobile station that reduce the time required for the communication.
  • a communication system includes one or more base stations capable of transmitting and receiving a plurality of independent radio signals each having a different frequency, one main radio signal and one or more of the plurality of radio signals.
  • Mobile stations that can communicate with each other using a radio signal that is a subordinate of the mobile station.
  • Each of the mobile station and the base station includes a storage unit for holding setting information related to a secondary radio signal used by the mobile station.
  • Each of the first base station that transmits / receives a main radio signal to / from the mobile station holds setting information even after communication using the main radio signal is disconnected.
  • each of the mobile station and the first base station performs communication using a plurality of radio signals by using the held setting information after communication using the main radio signal is resumed.
  • the mobile station and the first base station Each station performs communication using a plurality of radio signals by using the stored setting information as it is.
  • the mobile station and the first base station performs a new setting by replacing the information corresponding to the sub radio signal in the resumed communication with the information corresponding to the main radio signal before the disconnection in the information included in the held setting information. Generate information.
  • the main radio signal used in the resumed communication is a sub radio signal transmitted / received to / from a second base station different from the first base station before disconnection
  • Each of the mobile station and the second base station has information corresponding to the main radio signal before disconnecting information corresponding to the sub radio signal in the resumed communication among the information included in the held setting information. To generate new setting information.
  • the second base station acquires information and setting information corresponding to the main radio signal before disconnection from the first base station.
  • the main radio signal used in the resumed communication is neither the main radio signal nor the sub radio signal transmitted / received to / from the first base station before disconnection.
  • the base station is another radio signal transmitted / received by the base station, each of the mobile station and the first base station adds new information corresponding to the main radio signal before the disconnection to the held setting information. To generate correct setting information.
  • the main radio signal used in the resumed communication is neither the main radio signal nor the sub radio signal transmitted / received to / from the first base station before disconnection.
  • the second base station is different from the base station and transmits / receives another radio signal, each of the mobile station and the second base station corresponds to the main radio signal before disconnection in the stored setting information.
  • New setting information is generated by adding information to be performed.
  • the second base station acquires information and setting information corresponding to the main radio signal before disconnection from the first base station.
  • one or more base stations each capable of transmitting and receiving a plurality of independent radio signals having different frequencies, one main radio signal and one or more of the plurality of radio signals
  • a communication method with a mobile station that can communicate using a radio signal that is a subordinate of the mobile station is provided.
  • the communication method includes a step in which each of a mobile station and a base station retains setting information related to a secondary radio signal used by the mobile station, and a first base that transmits and receives a main radio signal between the mobile station and the mobile station.
  • Each of the stations holds the setting information even after the communication using the main radio signal is disconnected.
  • a base station that performs communication with a mobile station.
  • the base station includes transmission / reception means for transmitting / receiving a plurality of independent radio signals each having a different frequency.
  • the mobile station can communicate using one main radio signal and one or more sub radio signals among a plurality of radio signals.
  • the base station further includes storage means for holding setting information regarding sub radio signals used by the mobile station. When the base station transmits / receives a main radio signal to / from the mobile station, the base station retains setting information even after communication using the main radio signal is disconnected.
  • a mobile station capable of communicating with one or more base stations capable of transmitting and receiving a plurality of independent radio signals each having a different frequency.
  • the mobile station communicates using one main radio signal and one or more sub radio signals among a plurality of radio signals, and setting information regarding sub radio signals used by the mobile station Storage means for holding the data.
  • the mobile station When transmitting and receiving a main radio signal to and from the mobile station, the mobile station retains setting information even after communication using the main radio signal is disconnected.
  • FIG. 10 is a sequence diagram showing a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the first embodiment.
  • FIG. 11 is a sequence diagram showing a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the second embodiment. It is a figure for demonstrating the replacement process of SCell_Configuration according to Embodiment 2.
  • FIG. FIG. 11 is a sequence diagram showing a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the third embodiment.
  • FIG. 16 is a sequence diagram illustrating a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the fourth embodiment. It is a figure for demonstrating the addition process / update process of the information of the new SCell in SCell_Configuration according to Embodiment 4.
  • FIG. FIG. 16 is a sequence diagram illustrating a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the fifth embodiment.
  • FIG. 1 is a schematic diagram showing a configuration of a communication system 1 assumed in the embodiment of the present invention. As a typical example, it is assumed that the communication system 1 supports a communication method according to the LTE method or the LTE-A method.
  • a communication system 1 includes a plurality of base stations (evolved Node B: hereinafter also referred to as “eNB”) 100-1 to 100-3 and a mobile station (User Equipment: hereinafter also referred to as “UE”). 200), a mobility management function (Mobility Management Entity: hereinafter also referred to as “MME”) 300, and a core network 400.
  • eNB evolved Node B
  • UE User Equipment
  • MME Mobility Management Entity
  • Each of the eNBs 100-1 to 100-3 (hereinafter also collectively referred to as “eNB 100”) can transmit and receive a plurality of independent radio signals having different frequencies. That is, the eNB 100 supports carrier aggregation and provides a plurality of cells corresponding to component carriers, as will be described later. Provision of such a plurality of cells is realized by a method of physically multiplexing such as frequency and transmission area, a method of logical multiplexing, a method combining both methods, and the like.
  • the eNB 100 has a plurality of radio transceivers, and each radio transceiver transmits and receives a radio signal having a designated frequency to a designated area. That is, the eNB 100 has a configuration that can handle a plurality of component carriers (CCs), thereby realizing carrier aggregation.
  • CCs component carriers
  • the mobile station 200 is typically a mobile phone, a PDA (Personal Digital Assistant), a data communication terminal, and the like, and exchanges data with the other party via one of the eNBs 100.
  • PDA Personal Digital Assistant
  • Each of the MMEs 300-1, 300-2,... (Hereinafter collectively referred to as “MME300”) mediates the connection of the eNB 100 connected to the own station to the core network 400 and is managed by the own station.
  • the location information of the mobile station 200 existing in the cell of the eNB 100 is managed.
  • a plurality of eNBs 100 are connected to each MME 300.
  • a large number of eNBs 100 are connected to the core network 400 via a plurality of MMEs 300 to form a wide area network.
  • the core network 400 is assumed to be a network in which all information is packetized.
  • FIG. 2 is a schematic diagram showing an example of a cell provided in the communication system 1 shown in FIG. With reference to FIG. 2, each eNB 100 of the communication system 1 provides at least cells having different frequencies and transmission areas.
  • the mobile station 200 uses, as a serving cell, a cell that covers a position where the mobile station 200 exists.
  • a serving cell used for communication with the mobile station 200 is a combination of one PCell (Primary Serving Cell) and one or more SCells (Secondary Serving Cells). May consist of Each cell includes at least one component carrier.
  • the mobile station 200 includes one main radio signal (PCC: Primary Component Carrier) and one or more sub radio signals among a plurality of radio signals (component carriers) provided by one or more eNBs 100, respectively.
  • PCC Primary Component Carrier
  • SCC Secondary Component Carrier
  • the frequency division multiplexing (Frequency Division Duplex: FDD) system and the time division multiplexing (Time Division Duplex: TDD) system are supported.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the FDD system is used.
  • adopted is shown.
  • the present invention is similarly applicable when the TDD method is adopted.
  • FIG. 2 shows an example in which a plurality of component carriers provided by the eNB 100 are not continuous in the frequency domain. That is, each eNB 100 is assigned a plurality of discretely arranged frequency bands as radio resources. In the example shown in FIG. 2, component carriers in two frequency bands (frequency band I and frequency band II) are used. Each frequency band may include a plurality of component carriers.
  • the frequency band that can be used in this way is systematically defined according to the radio wave administration of each country. For example, as the frequency band I, any frequency in the 800 MHz band (uplink: 824 MHz-849 MHz / downlink: 869 MHz-894 MHz) is assigned, and as the frequency band II, the 2 GHz band (uplink: 1920 MHz-1980 MHz / Any frequency of (downlink: 2110 MHz-2170 MHz) is allocated.
  • each of the eNBs 100-1 to 100-3 has three frequency band I cells and three frequency band II cells around it. More specifically, the eNB 100-1 provides cell areas C11A, C12A, and C13A configured with frequency band I component carriers and cell areas C11B, C12B, and C13B configured with frequency band II component carriers. To do. Similarly, the eNB 100-2 provides cell areas C21A, C22A, and C23A configured by frequency band I component carriers and cell areas C21B, C22B, and C23B configured by frequency band II component carriers. The eNB 100-3 provides cell areas C31A, C32A, and C33A configured with frequency band I component carriers and cell areas C31B, C32B, and C33B configured with frequency band II component carriers.
  • the cell area of the frequency band I and the cell area of the frequency band II are set so that at least some of them overlap each other. However, the size is different between the cell area of the frequency band I and the cell area of the frequency band II. This is because the propagation characteristics and attenuation characteristics of radio signals differ depending on the frequency. When a plurality of different frequency bands as described above are used, the sizes of cell areas provided by the same eNB 100 may be different.
  • each cell area shown in FIG. 2 may include a plurality of cells that are physically and / or logically partitioned. In this case, a plurality of cells provided in a common cell area are serving cells.
  • connection typically includes a process of starting the use of a component carrier (same or different) after the use of the component carrier is stopped.
  • connection does not limit the operation before starting to use the component carrier. Therefore, “reconnection” is a generic term for an operation for starting to use some component carrier regardless of the previous operation. Note that the cause of disconnection is not limited to the occurrence of a radio link failure, but may be caused by various disturbances.
  • connection is also performed in a handover that occurs when the mobile station 200 moves. Furthermore, as described above, since a plurality of cells are provided in the same cell area, even if the mobile station 200 is not moving, a certain cell is provided between the plurality of cells provided in the same cell area. The operation of changing the connection destination of the mobile station 200 from one cell to another cell can also be included in “handover” or “reconnection”. The present embodiment is directed to a method for setting information in such “reconnection”.
  • FIG. 3 is a block diagram showing a schematic configuration of base station (eNB) 100 according to the embodiment of the present invention.
  • the eNB 100 basically includes a number of transmission / reception circuits corresponding to component carriers that can be provided simultaneously. More specifically, the eNB 100 includes control units 102-1 to 102-n, signal processing units 110-1 to 110-n, transmission units 112-1 to 112-n, and transmission antennas 114-1 to 114. -N, receiving units 116-1 to 116-n, and receiving antennas 118-1 to 118-n. Further, the eNB 100 includes a central control unit 104, an upper network interface (I / F) 106, and a control interface (I / F) 108.
  • I / F upper network interface
  • I / F control interface
  • Each of the transmission / reception circuits of the eNB 100 exchanges data (radio signals) with the mobile station 200 using the assigned component carrier. That is, each of the control units 102-1 to 102-n outputs user data, control information, management information, and the like given from the central control unit 104 to the corresponding signal processing units 110-1 to 110-n, and The user data decrypted by the processing units 110-1 to 110-n is output to the central control unit 104.
  • the signal processors 110-1 to 110-n process radio signals exchanged with the mobile station 200 existing in the area where the corresponding component carrier reaches. More specifically, the signal processing units 110-1 to 110-n receive user data, control information, management information, and the like given from the corresponding control units 102-1 to 102-n, and then send the received data to the mobile station 200. Information to be transmitted is output to corresponding transmitting sections 112-1 to 112-n. Transmitting sections 112-1 to 112-n perform coding processing, modulation processing and up-conversion on information received from corresponding signal processing sections 110-1 to 110-n, and wireless signals obtained as a result Are radiated to the outside via the corresponding transmitting antennas 114-1 to 114-n.
  • Receiving sections 116-1 to 116-n perform down-conversion, demodulation processing, and decoding processing on radio signals received via corresponding receiving antennas 118-1 to 118-n, and obtain the result.
  • the information is output to the corresponding signal processing units 110-1 to 110-n.
  • the central control unit 104 includes, as main components, a processor, a nonvolatile memory for holding a program executed by the processor, and a volatile memory functioning as a work memory. Further, the central control unit 104 includes a carrier aggregation logic 105. This logic is typically provided by the central control unit 104 executing a program stored in advance. For example, modules corresponding to the carrier aggregation logic 105 are stored in advance in a nonvolatile memory, and the central control unit 104 reads and executes these modules to provide functions as described later.
  • the carrier aggregation logic 105 executes various procedures for realizing carrier aggregation with the mobile station 200. As will be described later, this procedure includes a procedure related to configuration when reconnection occurs. This configuration is held in the storage unit 120. The carrier aggregation logic 105 refers to the storage unit 120 to set information necessary for carrier aggregation.
  • a part or all of the functions provided by the central control unit 104 may be implemented as dedicated hardware (integrated circuit).
  • all or part of the functions provided by the receiving units 116-1 to 116-n may be integrated into one chip.
  • a SoC in which components such as a processor, a memory, and a controller for peripheral devices are integrated into one chip.
  • the signal processing units 110-1 to 110-n As an alternative configuration, provided by the control units 102-1 to 102-n, the signal processing units 110-1 to 110-n, the transmission units 112-1 to 112-n, and the reception units 116-1 to 116-n. All or a part of the functions may be implemented as software.
  • an arithmetic device such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor) executes a preinstalled instruction set.
  • the host network interface 106 exchanges user data, control information, management information, and the like with the MME 300 that manages its own station. Similarly, the control interface 222 exchanges control information with other eNBs 100.
  • FIG. 4 is a block diagram showing a schematic configuration of mobile station (UE) 200 according to the embodiment of the present invention.
  • mobile station 200 has a number of transmission / reception circuits corresponding to available component carriers.
  • mobile station 200 is provided with transmitting antennas 214-1 and 214-2 for transmitting radio signals and receiving antennas 218-1 and 218-2 for receiving radio signals.
  • a housing 250 is included.
  • the casing 250 includes a central control unit 204, a signal processing unit 202, transmission units 212-1 and 212-2, and reception units 216-1 and 216-2.
  • the signal processing unit 202 processes a radio signal exchanged with the eNB 100 that manages a cell in which the own device exists. More specifically, the signal processing unit 202 outputs information to be transmitted to the eNB 100 to the transmission units 212-1 and 212-2 in accordance with an internal command given from the central control unit 204. Transmitting units 212-1 and 212-2 perform encoding processing, modulation processing, and up-conversion on the information received from signal processing unit 202, and transmit the resulting radio signal to corresponding transmitting antenna 214-1. , 214-2. In addition, the reception units 216-1 and 216-2 perform down-conversion, demodulation processing, and decoding processing on the radio signals received via the corresponding reception antennas 218-1 and 218-2, and obtain the result. The information is output to the signal processing unit 202.
  • the central control unit 204 includes, as main components, a processor, a non-volatile memory for holding a program executed by the processor, and a volatile memory functioning as a work memory. Further, the central control unit 204 includes a carrier aggregation logic 205. This logic is typically provided by the central control unit 204 executing a program stored in advance. For example, modules corresponding to the carrier aggregation logic 205 are stored in advance in a non-volatile memory, and the central control unit 204 reads and executes these modules to provide functions as described below.
  • the carrier aggregation logic 205 executes various procedures for realizing carrier aggregation with the eNB 100. As will be described later, this procedure includes a procedure related to configuration when reconnection occurs. This configuration is stored in the storage unit 220. The carrier aggregation logic 205 sets information necessary for carrier aggregation by referring to the storage unit 220.
  • the central control unit 204 may be implemented as dedicated hardware (integrated circuit). In this case, in addition to the functions provided by the central control unit 204, the functions provided by the signal processing unit 202, the transmission units 212-1 and 212-2, and the reception units 216-1 and 216-2. The whole or a part may be integrated into one chip. Furthermore, it is possible to use a SoC in which components such as a processor, a memory, and a controller for peripheral devices are integrated into one chip.
  • central control unit 104 As an alternative configuration, all or part of the functions provided by the central control unit 104, signal processing unit 202, transmission units 212-1 and 212-2, and reception units 216-1 and 216-2 are implemented as software. May be.
  • an arithmetic unit such as a CPU or DSP executes a preinstalled instruction set.
  • the casing 250 further includes a display unit 252 for displaying various types of information, a microphone 254 for acquiring user's voice, a speaker 256 for reproducing the received voice, and a user operation. It includes an input unit 258 and a GPS (Global Positioning System) unit 260 for acquiring position information of the local station.
  • a GPS Global Positioning System
  • SCell_Configuration is defined as setting information related to one or more sub radio signals used by the mobile station 200, that is, SCC.
  • This SCell_Configuration includes a physical cell ID and frequency information for each SCell (SCC).
  • the SCC that is the component carrier corresponding to the SCell includes “configuration state” and “non-configuration state” as state values. Furthermore, the configuration state includes “activate” and “deactivate”.
  • FIG. 5 is a transition diagram showing a state regarding the SCC of the carrier aggregation.
  • a non-configuration state in which Configuration is not set and a configuration state in which Configuration is set are included.
  • carrier aggregation is not performed unless activated. That is, the configuration is initially set to deactivate, and if it is determined that the radio quality of the SCell is good based on a report from the mobile station 200 regarding the radio quality in the SCell, the SCell is activated. Changed to Then, communication between eNB100 and the mobile station 200 in SCell is performed.
  • FIG. 6 is a sequence diagram showing a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the current specification.
  • RLF radio link failure
  • SCell_Configuration which is information for setting the SCell in the configuration state, is also released.
  • the sequence diagram illustrated in FIG. 6 illustrates a case where the mobile station 200 performs carrier aggregation using one of the cells provided by the eNB 100-1 as a PCell. Although not shown, one or more cells provided by the eNB 100-1 or another eNB can be used as the SCell.
  • mobile station 200 is communicating with eNB 100-1 using a PCell provided by eNB 100-1 (sequence SQ200).
  • SCell_Configuration for defining the SCell used for carrier aggregation (CA) is set. That is, each of the mobile station 200 and the eNB 100-1 holds SCell_Configuration.
  • the mobile station 200 releases the SCell_Configuration setting held by the mobile station 200 (sequence SQ204). Also, for the eNB 100-1, the SCell_Configuration setting held by the own station is released (sequence SQ206).
  • the mobile station 200 starts an RRC_Connection_Reestablishment procedure in order to recover the disconnected connection. That is, mobile station 200 transmits RRC_Connection_Reestablishment_Request to eNB 100-1 periodically or for each predetermined event (sequence SQ208).
  • This RRC_Connection_Reestablishment_Request is a request for reconnecting a disconnected connection.
  • the eNB 100-1 When the radio link failure in the PCC is recovered and the eNB 100-1 receives the RRC_Connection_Reestablishment_Request from the mobile station 200, the eNB 100-1 notifies the mobile station 200 of the RRC_Connection_Reestablishment (sequence SQ210). Upon receiving the RRC_Connection_Reestablishment from the eNB 100-1, the mobile station 200 performs necessary settings and then transmits an RRC_Connection_Reestablishment_Complete to notify the completion of the RRC_Connection_Reestablishment procedure to the eNB 100-1 (sequence 212). Then, mobile station 200 resumes communication with eNB 100-1 using the PCell provided by eNB 100-1 (sequence SQ214).
  • the SCell_Configuration setting is released in the sequences SQ204 and SQ206, the SCell_Configuration for defining the SCell used for the carrier aggregation (CA) is not set. Therefore, in order to resume carrier aggregation, the SCell configuration procedure is executed again.
  • eNB 100-1 notifies RRC_Connection_Reconfiguration to mobile station 200 (sequence SQ216).
  • This RRC_Connection_Reconfiguration includes SCell_Configuration.
  • SCell_Configuration for prescribing the SCell used for carrier aggregation (CA) is reset.
  • the mobile station 200 When the mobile station 200 receives the RRC_Connection_Reconfiguration from the eNB 100-1, the mobile station 200 holds the SCell_Configuration included therein, and then transmits an RRC_Connection_Reconfiguration_Q2 (18) to the eNB 100S1 to transmit the RRC_Connection_Reconfiguration_Q2 to notify the completion of the SCell Configuration procedure. Then, mobile station 200 starts communication by carrier aggregation (CA) using SCell designated by SCell_Configuration in addition to PCell provided by eNB 100-1 (sequence SQ220).
  • CA carrier aggregation
  • the communication system 1 provides a procedure that can avoid such waste of radio resources and processing time.
  • Embodiment 1 First, (1) a procedure for reconnecting to the same PCell after the connection at the PCell is disconnected will be described.
  • the eNB 100 that provides the mobile station 200 and the PCell continues to hold the SCell_Configuration that was held immediately before the eNB 100, even if a radio link failure (RLF) occurs.
  • RLF radio link failure
  • each of the NBs 100-1 that transmit / receive a main radio signal (PCC) between the mobile station 200 and the mobile station 200 uses the setting information even after communication using the main radio signal is disconnected.
  • a certain SCell_Configuration is held. At this time, the contents of SCell_Configuration are also maintained without change.
  • FIG. 7 is a sequence diagram showing a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the first embodiment.
  • RLF radio link failure
  • SCell_Configuration for defining the SCell used for carrier aggregation (CA) is set. That is, each of the mobile station 200 and the eNB 100-1 holds SCell_Configuration.
  • the mobile station 200 holds the SCell_Configuration setting held by the mobile station 200 without releasing it (sequence SQ104). Also, the eNB 100-1 holds the SCell_Configuration setting held by the own station without releasing it (sequence SQ106).
  • the mobile station 200 starts an RRC_Connection_Reestablishment procedure in order to recover the disconnected connection. That is, mobile station 200 transmits RRC_Connection_Reestablishment_Request to any cell periodically or for each predetermined event (sequence SQ108).
  • This RRC_Connection_Reestablishment_Request is a request for reconnecting a disconnected connection.
  • the eNB 100-1 When the radio link failure in the PCC recovers and the eNB 100-1 receives the RRC_Connection_Reestablishment_Request from the mobile station 200, the eNB 100-1 notifies the mobile station 200 of the RRC_Connection_Reestablishment (sequence SQ110). Upon receiving the RRC_Connection_Reestablishment from the eNB 100-1, the mobile station 200 performs necessary settings, and then transmits an RRC_Connection_Reestablishment_Complete to notify the completion of the RRC_Connection_Reestablishment procedure to the eNB 100-1 (sequence 112). Then, mobile station 200 resumes communication with eNB 100-1 using the PCell provided by eNB 100-1 (sequence SQ114).
  • the mobile station 200 and the eNB 100-1 determine that the connection can be recovered using the same cell as before the occurrence of the radio link failure, and reuse the SCell_Configuration settings held by each cell as they are (sequences SQ114 and SQ116). ). That is, since the mobile station 200 resumes communication with the mobile station 200 using the same PCell as before the occurrence of the radio link failure, the mobile station 200 uses the SCell setting as it is. Thereby, mobile station 200 resumes communication by carrier aggregation (CA) using SCell designated by SCell_Configuration in addition to PCell provided by eNB 100-1 (sequence SQ118).
  • CA carrier aggregation
  • the main radio signal (PCC) used in the communication resumed after the occurrence of the radio link failure is transmitted / received to / from the eNB 100-1 before the connection is disconnected.
  • PCC the radio signal
  • each of the mobile station 200 and the base station eNB 100-1 restarts carrier aggregation using the held setting information as it is.
  • SCell_Configuration for defining the SCell used for carrier aggregation (CA). The wireless resources and processing time required for this are not wasted.
  • the old SCell becomes a new PCell when viewed from the mobile station 200.
  • the old PCell can be a new SCell when viewed from the mobile station 200.
  • SCell_Configuration is retained without being released, and after the radio link failure is recovered, only the information on the old SCell (new PCell) included in the SCell_Configuration is invalidated, and further, the old PCell (new SCell) By replacing with information, SCell_Configuration can be reused.
  • carrier aggregation can be resumed more quickly by updating and reusing only information related to cells that need to be changed without releasing SCell_Configuration that was held before the occurrence of a radio link failure. That is, each of the mobile station 200 and the eNB 100-1 resumes carrier aggregation using the held setting information after communication using the main radio signal (PCC) is resumed.
  • PCC main radio signal
  • FIG. 8 is a sequence diagram showing a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the second embodiment.
  • RLF radio link failure
  • mobile station 200 is in communication with eNB 100-1 using PCell and SCell provided by eNB 100-1 (sequence SQ100A).
  • SCell_Configuration for defining the SCell used for carrier aggregation (CA) is set. That is, each of the mobile station 200 and the eNB 100-1 holds SCell_Configuration.
  • the mobile station 200 holds the SCell_Configuration setting held by the mobile station 200 without releasing it (sequence SQ104). Also, the eNB 100-1 holds the SCell_Configuration setting held by the own station without releasing it (sequence SQ106).
  • the mobile station 200 starts an RRC_Connection_Reestablishment procedure in order to recover the disconnected connection. That is, mobile station 200 transmits RRC_Connection_Reestablishment_Request to any cell periodically or for each predetermined event (sequence SQ108A).
  • FIG. 8 shows a case where RRC_Connection_Reestablishment_Request is received by an SCell (SCC) belonging to the eNB 100-1. That is, when eNB 100-1 receives RRC_Connection_Reestablishment_Request by SCC, eNB 100-1 notifies RRC_Connection_Reestablishment to mobile station 200 (sequence SQ110A).
  • SCC SCell
  • the mobile station 200 Upon receiving the RRC_Connection_Reestablishment from the SCell (SCC) belonging to the eNB 100-1, the mobile station 200 performs a necessary setting, and then transmits an RRC_Connection_Reestablishment procedure to the RRC_Connection_Reestablishment sequence 100SQA 112 for transmitting the RRC_Connection_Reestablishment to the eNB 100-1 . Then, mobile station 200 resumes communication with eNB 100-1 using old SCell provided by eNB 100-1 as a new PCell (sequence SQ118A). Note that carrier aggregation can also be performed using the old PCell provided by the eNB 100-1 as a new SCell.
  • the mobile station 200 and the eNB 100-1 determine that the connection has been recovered using the cell that was the SCell before the occurrence of the radio link failure, and are included in the SCell_Configuration Information on the old SCell is replaced with information on the old PCell (sequences SQ114A and SQ116A). Then, mobile station 200 resumes communication by carrier aggregation (CA) using SCell designated by SCell_Configuration after replacing this information in addition to the new PCell connected (sequence SQ118A).
  • CA carrier aggregation
  • FIG. 9 is a diagram for explaining replacement processing of SCell_Configuration according to the second embodiment.
  • FIG. 9 shows a configuration example in which information for a maximum of four cells can be stored as SCell as SCell_Configuration held in storage unit 120 (FIG. 3) and storage unit 220 (FIG. 4). More specifically, as shown in FIG. 9C, SCell information in which physical cell IDs and frequency information for each cell are indexed (SCellIndex) is used. And as shown to (A) or (B) of FIG. 9, SCellIndex for specifying the cell used as SCell among SCell information is stored in SCell_Configuration.
  • SCellIndex SCellIndex for specifying the cell used as SCell among SCell information is stored in SCell_Configuration.
  • the value of the SCellIndex corresponding to the old PCell is changed to the SCell_Configuration.
  • the main radio signal (PCC) used in communication resumed after the occurrence of a radio link failure has been transmitted / received to / from the eNB 100-1 before disconnection.
  • Mobile station 200 and eNB 100-1 each correspond to the sub radio signal (SCC) in the resumed communication among the information included in the held configuration information.
  • New setting information is generated by replacing the information with information corresponding to the main radio signal before disconnection.
  • Embodiment 3 (3) a procedure for reconnecting to an SCell belonging to an eNB different from the eNB to which the PCell belongs after the connection at the PCell is disconnected (SCell becomes a new PCell) will be described. Also in this case, the eNB 100 that provides the mobile station 200 and the PCell continues to hold the SCell_Configuration that was held immediately before the eNB 100, even if a radio link failure (RLF) occurs. In other words, each of the NBs 100-1 that transmit / receive a main radio signal (PCC) between the mobile station 200 and the mobile station 200 uses the setting information even after communication using the main radio signal is disconnected. A certain SCell_Configuration is held.
  • PCC main radio signal
  • the old SCell becomes a new PCell when viewed from the mobile station 200.
  • the old PCell can be a new SCell when viewed from the mobile station 200.
  • SCell_Configuration is retained without being released, and after reconnection, only the information of the old SCell (new PCell) included in the SCell_Configuration is invalidated and further replaced with the information of the old PCell (new SCell).
  • SCell_Configuration can be reused.
  • carrier aggregation can be resumed more quickly by updating and reusing only information related to cells that need to be changed without releasing SCell_Configuration that was held before the occurrence of a radio link failure.
  • Each of the mobile station 200 and the eNB 100-1 resumes carrier aggregation using the held setting information after communication using the main radio signal (PCC) is resumed.
  • the eNB to which the reconnected SCell belongs does not hold necessary information, the information is acquired from the eNB to which the old PCell belongs. That is, necessary information exchange is performed between the old connection destination eNB and the new connection destination eNB.
  • FIG. 10 is a sequence diagram showing a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the third embodiment.
  • RLF radio link failure
  • mobile station 200 is assumed to be communicating with PCell provided by eNB 100-1 and SCell provided by eNB 100-2 (sequence SQ100B).
  • SCell_Configuration for defining the SCell used for carrier aggregation (CA) is set. That is, the mobile station 200, the eNB 100-1, and the eNB 100-2 each hold SCell_Configuration.
  • the mobile station 200 holds the SCell_Configuration setting held by the mobile station 200 without releasing it (sequence SQ104). Also, the eNB 100-1 holds the SCell_Configuration setting held by the own station without releasing it (sequence SQ106).
  • the mobile station 200 starts an RRC_Connection_Reestablishment procedure in order to recover the disconnected connection. That is, mobile station 200 transmits RRC_Connection_Reestablishment_Request to any cell periodically or for every predetermined event (sequence SQ108B).
  • FIG. 10 shows an example in which RRC_Connection_Reestablishment_Request is received by an SCell (SCC) belonging to eNB 100-2. That is, when the eNB 100-2 receives the RRC_Connection_Reestablishment_Request by the SCC, the eNB 100-2 executes processing necessary for reconnection. More specifically, based on the pre-disconnection information included in the RRC_Connection_Reestablishment_Request, the eNB 100-2 determines whether or not the old PCell information and the SCell_Configuration setting are held by the own station.
  • SCC SCell
  • the eNB 100-2 inquires the eNB 100-1 to which the old PCell belongs (sequence SQ130) for the old PCell information and the SCell_Configuration setting. In response to this inquiry, the eNB 100-1 reports the old PCell information and SCell_Configuration setting held by the eNB 100-1 to the eNB 100-2.
  • eNB 100-2 notifies mobile station 200 of RRC_Connection_Reestablishment (sequence SQ110B).
  • the mobile station 200 Upon receiving the RRC_Connection_Reestablishment from the SCell (SCC) belonging to the eNB 100-2, the mobile station 200 performs necessary settings, and then transmits the RRC_Connection_Reestablishment procedure to the RRC_Connection_Reestablishment sequence 100SQB 112 to the eNB 100 . Then, mobile station 200 resumes communication with eNB 100-2 using old SCell provided by eNB 100-2 as a new PCell (sequence SQ118B).
  • the mobile station 200 and the eNB 100-2 determine that the connection has been recovered using the cell that was the SCell before the occurrence of the radio link failure, and are included in the SCell_Configuration Information on the old SCell is replaced with information on the old PCell (sequences SQ114B and SQ116B). Then, mobile station 200 resumes communication by carrier aggregation (CA) using the SCell designated by the SCell_Configuration after replacing this information in addition to the new PCell connected (sequence SQ118B).
  • CA carrier aggregation
  • the eNB 100-1 to which the old PCell belongs releases the held SCell_Configuration (sequence SQ120).
  • SCell_Configuration sequence SQ120.
  • the mobile station 200 and the eNB 100-2 are sub-radio signals (SCC) transmitted / received in the mobile station 200 and the eNB 100-2
  • the eNB 100-2 may acquire information and setting information corresponding to the main radio signal (PCC) before disconnection from the eNB 100-1.
  • Embodiment 4 Next, (4) Procedures for reconnecting to a cell (cell other than the serving cell) that belongs to the same eNB as the eNB to which the PCell belongs after being disconnected from the PCell, but is different from the PCell or SCell explain. Also in this case, the eNB 100 that provides the mobile station 200 and the PCell continues to hold the SCell_Configuration that was held immediately before the eNB 100, even if a radio link failure (RLF) occurs. In other words, each of the NBs 100-1 that transmit / receive a main radio signal (PCC) between the mobile station 200 and the mobile station 200 uses the setting information even after communication using the main radio signal is disconnected. A certain SCell_Configuration is held.
  • PCC main radio signal
  • the cell becomes a new PCell when viewed from the mobile station 200.
  • the old PCell can be a new SCell when viewed from the mobile station 200.
  • the SCell_Configuration is retained without being released, and after the reconnection, the SCell_Configuration is reused by adding or updating the old PCell information as the new SCell information in the SCell_Configuration.
  • carrier aggregation can be resumed more quickly by updating and reusing only information related to cells that need to be changed without releasing SCell_Configuration that was held before the occurrence of a radio link failure. That is, each of the mobile station 200 and the eNB 100-1 resumes carrier aggregation using the held setting information after communication using the main radio signal (PCC) is resumed.
  • PCC main radio signal
  • FIG. 11 is a sequence diagram showing a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the fourth embodiment.
  • RLF radio link failure
  • mobile station 200 is in communication with eNB 100-1 using a PCell provided by eNB 100-1 (sequence SQ100).
  • SCell_Configuration for defining the SCell used for carrier aggregation (CA) is set. That is, each of the mobile station 200 and the eNB 100-1 holds SCell_Configuration.
  • the mobile station 200 holds the SCell_Configuration setting held by the mobile station 200 without releasing it (sequence SQ104). Also, the eNB 100-1 holds the SCell_Configuration setting held by the own station without releasing it (sequence SQ106).
  • the mobile station 200 starts an RRC_Connection_Reestablishment procedure in order to recover the disconnected connection. That is, mobile station 200 transmits RRC_Connection_Reestablishment_Request to any cell periodically or for every predetermined event (sequence SQ108C).
  • FIG. 11 shows a case where RRC_Connection_Reestablishment_Request is received in a cell (cell other than the serving cell) different from the PCell or SCell belonging to the eNB 100-1. That is, when a cell other than the serving cell of eNB 100-1 receives RRC_Connection_Reestablishment_Request, eNB 100-1 notifies RRC_Connection_Reestablishment to mobile station 200 (sequence SQ110C).
  • the mobile station 200 Upon receiving the RRC_Connection_Reestablishment from a cell other than the serving cell belonging to the eNB 100-1, the mobile station 200 performs necessary settings, and then transmits an RRC_Connection_Reestablishment procedure to the RRC_Connection_Reestablishment sequence 100CQ 112 to transmit the RRC_Connection_Reestablishment to the eNB 100 . Then, mobile station 200 resumes communication with eNB 100-1 using a cell other than the serving cell provided by eNB 100-1 as a new PCell (sequence SQ118C). Note that carrier aggregation can also be performed using the old PCell provided by the eNB 100-1 as a new SCell.
  • the mobile station 200 and the eNB 100-1 determine that the connection can be recovered using a cell that was not a serving cell before the occurrence of a radio link failure. Then, the mobile station 200 and the eNB 100-1 reuse the SCell_Configuration by adding or updating the old PCell information as new SCell information in the held SCell_Configuration (sequences SQ114C and SQ116C). At this time, the mobile station 200 and the eNB 100-1 determine whether or not there is a free space for adding information to the held SCell_Configuration, and if there is a free space, adds information on the old PCell.
  • one piece of information of the SCell included in the held SCell_Configuration is replaced with information of the old PCell.
  • the old PCell information may be ignored and the SCell_Configuration setting before the occurrence of the radio link failure may be retained as it is.
  • mobile station 200 resumes communication by carrier aggregation (CA) using SCell_Configuration after being added or updated as new SCell information in addition to the new PCell connected (sequence SQ118C).
  • CA carrier aggregation
  • SCell_Configuration after being added or updated as new SCell information in addition to the new PCell connected (sequence SQ118C).
  • FIG. 12 is a diagram for explaining a new SCell information addition process / update process in the SCell_Configuration according to the fourth embodiment.
  • FIG. 12 shows a configuration example in which information for a maximum of four cells can be stored as SCell_Configuration as SCell_Configuration held in storage unit 120 (FIG. 3) and storage unit 220 (FIG. 4). This configuration example is the same as that shown in FIG.
  • FIG. 12 shows a case where there is an empty space for adding new SCell information in SCell_Configuration.
  • FIG. 12A shows an example in which three cells are registered in SCell_Configuration retained before the occurrence of a radio link failure, and one more cell can be additionally registered.
  • FIG. 13B shows a case where there is no free space for adding new SCell information to SCell_Configuration.
  • the information about the least useful SCell is specified according to a predetermined rule, deleted, and new SCell (old PCell) information is added.
  • a rule for determining such a least useful SCell a method of determining based on communication quality or the like can be considered.
  • Such a rule is shared between the mobile station 200 and the eNB 100 so that the contents of the updated SCell_Configuration do not contradict each other.
  • PCell (PCC) and all SCells (SCC) need to be operated at different frequencies, so that the mobile station 200 can be reconnected (new PCell).
  • PCell PCell
  • SCC all SCells
  • SCell_Configuration when there is no empty space in the SCell_Configuration, and the priority of the new SCell (old PCell) is relatively low, the information on the new SCell (old PCell) is not added or updated.
  • the contents of SCell_Configuration may be maintained as they are.
  • the main radio signal (PCC) used in the communication resumed after the occurrence of the radio link failure is transmitted / received to / from the eNB 100-1 before disconnection.
  • the eNB 100-1 is neither a radio signal (PCC) nor a sub radio signal (SCC) and is another radio signal transmitted and received by the eNB 100-1
  • each of the mobile station 200 and the eNB 100-1 holds setting information.
  • new setting information is generated by adding information corresponding to the main radio signal (PCC) before disconnection.
  • Embodiment 5 Next, (5) a procedure for reconnecting to a cell (cell other than the serving cell) belonging to an eNB different from the eNB to which the PCell belongs after being disconnected from the PCell will be described. To do. Also in this case, the eNB 100 that provides the mobile station 200 and the PCell continues to hold the SCell_Configuration that was held immediately before the eNB 100, even if a radio link failure (RLF) occurs. In other words, each of the NBs 100-1 that transmit / receive a main radio signal (PCC) between the mobile station 200 and the mobile station 200 uses the setting information even after communication using the main radio signal is disconnected. A certain SCell_Configuration is held.
  • PCC main radio signal
  • the cell becomes a new PCell when viewed from the mobile station 200.
  • the old PCell can be a new SCell when viewed from the mobile station 200.
  • the SCell_Configuration is retained without being released, and after the reconnection, the SCell_Configuration is reused by adding or updating the old PCell information as the new SCell information in the SCell_Configuration.
  • carrier aggregation can be resumed more quickly by updating and reusing only information related to cells that need to be changed without releasing SCell_Configuration that was held before the occurrence of a radio link failure. That is, each of the mobile station 200 and the eNB 100-1 resumes carrier aggregation using the held setting information after communication using the main radio signal (PCC) is resumed.
  • PCC main radio signal
  • the eNB to which the reconnected SCell belongs does not hold necessary information
  • the information is acquired from the eNB to which the old PCell belongs. That is, necessary information exchange is performed between the old connection destination eNB and the new connection destination eNB.
  • FIG. 13 is a sequence diagram showing a procedure when a radio link failure (RLF) occurs during communication by carrier aggregation according to the fifth embodiment.
  • RLF radio link failure
  • mobile station 200 is in communication with eNB 100-1 using a PCell provided by eNB 100-1 (sequence SQ100).
  • SCell_Configuration for defining the SCell used for carrier aggregation (CA) is set. That is, each of the mobile station 200 and the eNB 100-1 holds SCell_Configuration.
  • the mobile station 200 holds the SCell_Configuration setting held by the mobile station 200 without releasing it (sequence SQ104). Also, the eNB 100-1 holds the SCell_Configuration setting held by the own station without releasing it (sequence SQ106).
  • the mobile station 200 starts an RRC_Connection_Reestablishment procedure in order to recover the disconnected connection. That is, mobile station 200 transmits RRC_Connection_Reestablishment_Request to any cell periodically or for each predetermined event (sequence SQ108D).
  • FIG. 13 illustrates an example in which RRC_Connection_Reestablishment_Request belongs to eNB 100-2 different from eNB 100-1 and is received by a cell (cell other than the serving cell) different from SCell. That is, when a cell other than the serving cell of eNB 100-2 receives RRC_Connection_Reestablishment_Request, eNB 100-2 notifies RRC_Connection_Reestablishment to mobile station 200 (sequence SQ110D).
  • the mobile station 200 Upon receiving the RRC_Connection_Reestablishment from a cell other than the serving cell belonging to the eNB 100-2, the mobile station 200 performs a necessary setting, and then transmits an RRC_Connection_Reestablishment procedure to the RRC_Connection_Reestablishment sequence 100DQS 112 for transmitting the RRC_Connection_Reestablishment to the eNB 100 . Then, mobile station 200 resumes communication with eNB 100-2 using a cell other than the serving cell provided by eNB 100-2 as a new PCell (sequence SQ118D). Note that carrier aggregation can also be performed using the old PCell provided by the eNB 100-1 as a new SCell.
  • the mobile station 200 and the eNB 100-1 determine that the connection can be recovered using a cell that was not a serving cell before the occurrence of a radio link failure. Then, the mobile station 200 and the eNB 100-2 reuse the SCell_Configuration by adding or updating the old PCell information as the new SCell information in the held SCell_Configuration (sequences SQ114D and SQ116D). At this time, the mobile station 200 and the eNB 100-2 determine whether or not there is a free space for adding information to the held SCell_Configuration, and if there is a free space, adds information on the old PCell.
  • one piece of information of the SCell included in the held SCell_Configuration is replaced with information of the old PCell.
  • the old PCell information may be ignored and the SCell_Configuration setting before the occurrence of the radio link failure may be retained as it is.
  • mobile station 200 resumes communication by carrier aggregation (CA) using SCell_Configuration after being added or updated as new SCell information in addition to the new PCell connected (sequence SQ118D).
  • CA carrier aggregation
  • SCell_Configuration after being added or updated as new SCell information in addition to the new PCell connected (sequence SQ118D).
  • the main radio signal (PCC) used in the communication resumed after the occurrence of the radio link failure is transmitted / received to / from the eNB 100-1 before disconnection.
  • the radio station (PCC) and the secondary radio signal (SCC) are other radio signals transmitted and received by the eNB 100-2 different from the eNB 100-1
  • each of the mobile station 200 and the eNB 100-2 New setting information is generated by adding information corresponding to the main radio signal (PCC) before disconnection to the held setting information.
  • the eNB 100-2 may acquire information and setting information corresponding to the main radio signal (PCC) before disconnection from the eNB 100-1.
  • RLF radio link failure
  • the connection between the mobile station 200 and the eNB 100 is collectively disconnected.
  • the uplink and the downlink are independent of each other. Then, it may be controlled.
  • carrier aggregation it is possible to assign different component carriers to uplink and downlink, and when such a form is adopted, it is preferable to control each link independently. .
  • 1 communication system 100 base station (eNB), 102 control unit, 104, 204 central control unit, 105, 205 carrier aggregation logic, 106 upper network interface (I / F), 108 control interface (I / F), 110, 202 signal processing unit, 112, 212 transmission unit, 114, 214 transmission antenna, 116, 216 reception unit, 118, 218 reception antenna, 120, 220 storage unit, 200 mobile station (UE), 222 control interface (I / F) , 250 housing, 252 display unit, 254 microphone, 256 speaker, 258 input unit, 260 unit, 300 MME, 400 core network, C11A, C12A, C13A, C11B, C12B, C13B, C21A, 22A, C23A, C21B, C22B, C23B, C31A, C32A, C33A, C31B, C32B, C33B cell area.
  • eNB base station
  • 102 control unit 104, 204 central control unit, 105, 205

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

Abstract

La présente invention se rapporte à un système de communication comprenant : au moins une station de base, qui est apte à transmettre et à recevoir une pluralité de signaux sans fil, qui sont indépendants les uns des autres et qui ont chacun une fréquence différente ; et une station mobile, qui est apte à communiquer au moyen d'un signal sans fil principal et d'au moins un signal sans fil auxiliaire parmi la pluralité de signaux sans fil. Selon la présente invention, chacune de la station mobile et des stations de base comprend des moyens de stockage pour conserver des informations de paramétrage appartenant au signal sans fil auxiliaire employé par la station mobile. D'autre part, chacune de la station mobile et d'une première station de base qui transmet le signal sans fil principal à la station mobile et qui reçoit le signal sans fil principal de la station mobile, conserve les informations de paramétrage même après que la communication exécutée au moyen du signal sans fil principal a été déconnectée.
PCT/JP2012/071797 2011-08-31 2012-08-29 Système de communication, procédé de communication, station de base, et station mobile Ceased WO2013031808A1 (fr)

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