JP2011040851A - Radio link failure recovery method of mobile station device, mobile station device, and base station device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suspend re-connection processing so as not to release connection of an element frequency band in a way of a processing procedure of the element frequency band in which a radio link failure is not detected. <P>SOLUTION: A mobile station device establishes either one of element frequency bands as an anchor element frequency band, has a step of detecting the radio link failure for a plurality of element frequency bands, and discriminates whether or not the element frequency band detecting the radio link failure is the anchor element frequency band. If the element frequency band detecting the radio link failure is the anchor element frequency band, the mobile station device releases all element frequency bands assigned to the mobile station device. If the element frequency band detecting the radio link failure is not the anchor element frequency band, the mobile station device performs a re-setting request of the anchor element frequency band replacing the element frequency band detecting the radio link failure to the base station device. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mobile station apparatus in a mobile communication system, and more particularly to a radio link failure recovery method for a plurality of element frequency bands.

Evolved Universal Terrestrial Radio Access (hereinafter referred to as EUTRA), which evolved the 3rd generation mobile communication method, and its advanced EUTRA (also referred to as LTE-Advanced) in the 3rd Generation Partnership Project (3GPP) Consideration is ongoing.
EUTRA proposes a method of detecting a radio link failure in the physical layer, medium access control layer, and radio link control layer (Non-patent Document 1). In Advanced EUTRA, an SC-FDMA (Single Carrier-Frequency Division Multiple Access) system has been proposed as an uplink communication system.

  In Advanced EUTRA, carrier aggregation (Carrier Aggregation: frequency band aggregation) has been proposed as a technology that enables higher-speed data transmission while maintaining compatibility with EUTRA (Non-patent Document 2). Carrier aggregation is a mobile communication system having a transmission device and a reception device, in which a transmission device and a reception device having a reception bandwidth that exceeds the transmission bandwidth of the transmission device are prepared, and each of a plurality of different element frequency bands Transmitting data from a plurality of transmission devices in which a component carrier (CC: Component Carrier) or a carrier element is set, and receiving data transmitted from the plurality of transmission devices in a reception device This is a technique for improving the data rate. Also, in a mobile communication system having the transmission device and the reception device, a reception device and a transmission device having a transmission bandwidth exceeding the reception bandwidth of the reception device are prepared, and a plurality of frequency bands each having a different frequency band are set. In this technique, the receiving device receives data transmitted from the transmitting device, thereby improving the data rate.

3GPP TS36.331, Radio Resource Control (RRC) Protocol specification.V8.5.0http: //www.3gpp.org/ftp/Specs/html-info/36331.htm Ericsson, R1-082468,3GPP TSG-RAN1 Meeting # 53bis, Warsaw, Poland, June 30-July 4,2008

  However, in a mobile station apparatus that communicates with a base station apparatus using multiple element frequency bands, the radio link failure detection method differs depending on the layer in which the element frequency band is processed in EUTRA, and this is applied to Advanced EUTRA as it is. Then, a radio link failure may be detected for each element frequency band. That is, when a radio link failure is detected from one element frequency band, all element frequency bands allocated to the mobile station apparatus are released, and reconnection processing is performed.

  This causes waste of radio resources and reallocation time, and may detect radio link failures at different timings for multiple element frequency bands, and may lose radio resources at unexpected timings. . For these reasons, it is necessary to study a radio link failure recovery method suitable for Advanced EUTRA.

  The present invention has been made in view of such circumstances, and a mobile station apparatus that communicates with a base station apparatus using a plurality of element frequency bands detects a radio link failure from a plurality of different element frequency bands. In addition, a radio link failure recovery method for a mobile station apparatus capable of holding a reconnection process so as not to release a connection of an element frequency band in the middle of a processing procedure of an element frequency band in which no radio link failure is detected, and a mobile station An object is to provide a device and a base station device.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, a radio link failure recovery method for a mobile station apparatus according to the present invention is a radio link failure recovery method for a mobile station device that performs radio communication with a base station device using a plurality of element frequency bands. A step of setting any one element frequency band used for wireless connection as an anchor element frequency band, a step of detecting a radio link failure for each of the plurality of element frequency bands, and an element frequency band in which a radio link failure is detected Are determined to be in the anchor element frequency band, and if the element frequency band in which the radio link failure is detected is the anchor element frequency band as a result of the determination, the node is allocated to the mobile station apparatus. A step of releasing all the element frequency bands that have been determined, and the element frequency band in which the radio link failure is detected as a result of the determination If not the anchor element frequency band, performing a request to reset the element frequency band in the anchor element frequency band to substitute for the element frequency band in which the radio link failure is detected, to the base station apparatus; Re-setting the element frequency band based on the element frequency band reset information transmitted from the base station apparatus in response to the reset request; and re-setting of the element frequency band is completed. And notifying to the base station apparatus at least.

  As described above, when the element frequency band in which the radio link failure is detected is not the anchor element frequency band, in the anchor element frequency band, an element frequency band reconfiguration request for substituting the element frequency band in which the radio link failure has been detected, Since the connection is made to the base station apparatus, the connection of the element frequency band due to the radio link failure is not released, and the communication quality can be improved. Further, since the radio connection is not released when detecting a radio link failure other than the anchor element frequency band, it is possible to easily maintain the connection between the mobile station apparatus and the base station apparatus.

  (2) A radio link failure recovery method for a mobile station device according to the present invention is a radio link failure recovery method for a mobile station device that performs radio communication with a base station device using a plurality of element frequency bands, A step of detecting a radio link failure for each element frequency band, and whether or not specific processing is being performed in an element frequency band other than the element frequency band in which the radio link failure is detected when a radio link failure is detected And in the element frequency band other than the element frequency band in which the radio link failure is detected as a result of the determination, in the case where specific processing is being performed, other than the element frequency band in which the radio link failure is detected Holding at least the reconnection process until the specific process in the element frequency band is completed.

  As described above, when specific processing is performed in the element frequency band other than the element frequency band in which the radio link failure is detected, the specific processing in the element frequency band other than the element frequency band in which the radio link failure is detected is completed. Until this is done, the reconnection process is suspended, so that the influence on the element frequency band in which the specific process is performed can be minimized. In particular, by holding the reconnection process during the automatic retransmission request, the mobile station apparatus can transmit data such as downlink channel quality information to the base station apparatus, or the base station apparatus can complete the processing procedure of the element frequency band. Can be notified.

  (3) Also, in the radio link failure recovery method for a mobile station apparatus of the present invention, as a result of the determination, when specific processing is performed in an element frequency band other than the element frequency band in which the radio link failure is detected Suspending the release of radio resources in the element frequency band in which the radio link failure is detected until the specific processing in the element frequency band other than the element frequency band in which the radio link failure is detected is completed. Features.

  As described above, when specific processing is performed, the radio resource of the element frequency band in which the radio link failure is detected is completed until the specific processing in the element frequency band other than the element frequency band in which the radio link failure is detected is completed. Since the release is suspended, it is possible to avoid a situation in which specific processing is affected by releasing an element frequency band in which a radio link failure has occurred. Further, unnecessary processing is not required when a radio link failure is recovered, such as synchronization recovery.

  (4) A radio link fault recovery method for a mobile station apparatus according to the present invention is a radio link fault recovery method for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands. A step of detecting a radio link failure for each element frequency band; and a deactivation request for setting the element frequency band in which the radio link failure is detected to an inactive mode when a radio link failure is detected. And the element frequency band in which the radio link failure is detected based on the inactive mode setting information of the element frequency band transmitted from the base station apparatus in response to the deactivation request. And at least a step of notifying the base station apparatus that the setting to set the element frequency band to the inactive mode is completed. And wherein the door.

  Thus, the mobile station apparatus sets the element frequency band in which the radio link failure is detected to the inactive mode based on the inactive mode setting information of the element frequency band transmitted from the base station apparatus. Therefore, the reconnection process can be suspended only, and the influence on the processing procedure of the element frequency band in which no radio link failure is detected can be reduced.

  (5) The mobile station apparatus of the present invention is a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands, and receives the plurality of element frequency bands from the base station apparatus. A radio receiving unit, a scheduling unit configured to set any one element frequency band used for radio connection with the base station apparatus as an anchor element frequency band, and detecting a radio link failure for each of the plurality of element frequency bands When it is determined whether the element frequency band in which the radio link failure is detected is the anchor element frequency band, and as a result of the determination, the element frequency band in which the radio link failure is detected is the anchor element frequency band A radio resource control unit that releases all element frequency bands allocated to the mobile station apparatus, and the base station apparatus Characterized in that it comprises a radio transmitter for transmitting band, the.

  As described above, when the element frequency band in which the radio link failure is detected is the anchor element frequency band, all the element frequency bands assigned to the mobile station apparatus are released. Since the detection of a radio link failure other than the above does not release the radio connection, the connection of the element frequency band due to the radio link failure is not released, and the communication quality can be improved. Furthermore, it becomes possible to easily maintain the connection between the mobile station apparatus and the base station apparatus.

  (6) In the mobile station apparatus of the present invention, if the element frequency band in which the radio link failure is detected is not the anchor element frequency band as a result of the determination, the radio resource control unit determines the anchor element frequency band. The base station apparatus makes a request for resetting the element frequency band to substitute for the element frequency band in which the radio link failure is detected.

  As described above, when the element frequency band in which the radio link failure is detected is not the anchor element frequency band, in the anchor element frequency band, an element frequency band reconfiguration request for substituting the element frequency band in which the radio link failure has been detected, Since it is performed with respect to the base station apparatus, the mobile station apparatus is not released from the connection of the element frequency band due to the radio link failure and can improve the communication quality.

  (7) Moreover, in the mobile station apparatus of the present invention, the radio resource control unit is configured to use the element frequency band based on element frequency band reconfiguration information transmitted from the base station apparatus in response to the reconfiguration request. It is characterized by resetting.

  In this way, since the element frequency band is reset based on the element frequency band reset information transmitted from the base station apparatus, the base station apparatus transmits the transmission frequency of the element frequency band specified by the mobile station apparatus and Can newly set another element frequency band having a different transmission frequency. Further, the element frequency band IDs of the element frequency bands designated by the mobile station apparatus are the same, and it is possible to reset only the transmission frequency.

  (8) Further, in the mobile station apparatus of the present invention, the radio resource control unit notifies the base station apparatus that the resetting of the element frequency band is completed.

  Thus, since the base station apparatus is notified that the resetting of the element frequency band is completed, the base station apparatus can grasp that there is no problem in the resetting of the mobile station apparatus.

  (9) The mobile station apparatus of the present invention is a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands, and receives the plurality of element frequency bands from the base station apparatus. A radio resource control unit that detects a radio link failure for each of the plurality of component frequency bands, and an element frequency band other than the component frequency band that detected the radio link failure when a radio link failure is detected And a scheduling unit that determines whether or not specific processing is being performed, and a radio transmission unit that transmits the plurality of element frequency bands to the base station apparatus.

  Thus, when a radio link failure is detected, it is determined whether or not a specific process is being performed in an element frequency band other than the element frequency band in which the radio link failure is detected. The influence on the element frequency band can be minimized.

  (10) Moreover, in the mobile station apparatus of the present invention, when the scheduling unit performs a specific process in an element frequency band other than the element frequency band in which the radio link failure is detected as a result of the determination, The reconnection process is suspended until the specific process in the element frequency band other than the element frequency band in which the radio link failure is detected is completed.

  As described above, when specific processing is performed in the element frequency band other than the element frequency band in which the radio link failure is detected, the specific processing in the element frequency band other than the element frequency band in which the radio link failure is detected is completed. Until this is done, the reconnection process is suspended, so that the influence on the element frequency band in which the specific process is performed can be minimized. In particular, by holding the reconnection process during the automatic retransmission request, the mobile station apparatus can transmit data such as downlink channel quality information to the base station apparatus, or the base station apparatus can complete the processing procedure of the element frequency band. Can be notified.

  (11) Further, in the mobile station device of the present invention, when the scheduling unit performs a specific process in an element frequency band other than the element frequency band in which the radio link failure is detected as a result of the determination, The release of the radio resource in the element frequency band in which the radio link failure is detected is suspended until the specific processing in the element frequency band other than the element frequency band in which the radio link failure is detected is completed.

  In this way, release of radio resources in the element frequency band in which the radio link failure is detected is suspended until the specific processing in the element frequency band other than the element frequency band in which the radio link failure is detected is completed. By releasing the generated element frequency band, it is possible to avoid a situation that affects specific processing. Further, unnecessary processing is not required when a radio link failure is recovered, such as synchronization recovery.

  (12) In the mobile station apparatus of the present invention, the mobile station apparatus performs radio communication with a base station apparatus using a plurality of element frequency bands, and detects a radio link failure for each of the plurality of element frequency bands. When detecting a radio link failure with the radio resource control unit, an inactivation request is made to the base station apparatus to make the element frequency band in which the radio link failure is detected into an inactive mode. A scheduling unit for setting the element frequency band in which the radio link failure is detected to the inactive mode based on the inactive mode setting information of the element frequency band transmitted from the base station apparatus in response to the activation request. It is characterized by.

  Thus, since the element frequency band in which the radio link failure is detected is set to the inactive mode based on the inactive mode setting information of the element frequency band transmitted from the base station apparatus, the mobile station apparatus Only reconnection processing can be suspended.

  (13) Further, the base station apparatus of the present invention is characterized in that the scheduling unit notifies the base station apparatus that the setting for inactivating the element frequency band is completed.

  Thus, since the base station apparatus is notified that the setting for inactivating the element frequency band has been completed, the base station apparatus can grasp that there is no problem in resetting the mobile station apparatus. .

  (14) The base station apparatus of the present invention is a base station apparatus that performs radio communication with a mobile station apparatus using a plurality of element frequency bands, and transmits the plurality of element frequency bands with the mobile station apparatus. When receiving a request for resetting an element frequency band that substitutes for an element frequency band in which a radio link failure has been detected from the radio transceiver unit to be received and the mobile station apparatus, the parameter including the transmission frequency information is reset, A base station side scheduling unit that generates element frequency band resetting information, and the radio transmission / reception unit transmits the reset information to the mobile station apparatus, while the mobile station apparatus reconfigures the element frequency band. Information indicating that the setting has been completed is received.

  As described above, when a request for resetting an element frequency band that replaces the element frequency band in which the radio link failure is detected is received from the mobile station apparatus, the parameter including the transmission frequency information is reset, and the element frequency band Since the reconfiguration information is generated, the mobile station apparatus can improve the communication quality because the connection of the element frequency band due to the radio link failure is not released. Further, since the radio connection is not released when detecting a radio link failure other than the anchor element frequency band, it is possible to easily maintain the connection between the mobile station apparatus and the base station apparatus.

  (15) The base station apparatus of the present invention is a base station apparatus that performs radio communication with a mobile station apparatus using a plurality of element frequency bands, and transmits the plurality of element frequency bands with the mobile station apparatus. If a radio link failure is detected from the receiving radio transceiver unit and the mobile station device, and if an inactivation request is made to set the element frequency band in which the radio link failure is detected to an inactive mode, A base station side scheduling unit that generates instruction information for switching the element frequency band indicated in the activation request from the active mode to the inactive mode, and the radio transmission / reception unit transmits the instruction information to the mobile station device While transmitting, the mobile station apparatus receives information indicating that the setting for setting the element frequency band to the inactive mode is completed.

  As described above, when the deactivation request is received to set the element frequency band in which the radio link failure is detected to the inactive mode, the element frequency band indicated in the deactivation request is switched from the active mode to the inactive mode. Since the instruction information is generated, the mobile station apparatus can suspend the reconnection process for a predetermined time, and the influence on the processing procedure of the element frequency band in which no radio link failure is detected can be reduced.

  (16) A radio link failure recovery method according to the present invention is a radio link failure recovery method for a mobile station device that performs radio communication with a base station device using a plurality of element frequency bands, the plurality of element frequency bands. A step of detecting a radio link failure every time, and when a radio link failure is detected, an inactivation request is made to the base station apparatus to set an element frequency band in which the radio link failure is detected to an inactive mode. A step of making a reset request for using the inactive mode element frequency band for communication with the base station apparatus to the base station apparatus, and an activation request for setting the inactive mode element frequency band to the active mode. To the base station device, and based on the inactive mode setting information of the element frequency band transmitted from the base station device in response to the inactivation request. And setting the element frequency band in which the radio link failure is detected to an inactive mode, and based on the active mode setting information of the element frequency band transmitted from the base station apparatus in response to the activation request, A step of setting an inactive mode element frequency band to an active mode, a step of notifying the base station apparatus that the setting of an element frequency band in which the radio link failure has been detected is set to an inactive mode, and And at least a step of notifying the base station apparatus that the setting of setting the inactive mode element frequency band to the active mode is completed.

  As described above, when a radio link failure is detected, an inactivation request is made to the base station apparatus to set the element frequency band in which the radio link failure is detected to the inactive mode. A re-configuration request used for communication with the station device is made to the base station device, and an activation request to set the inactive mode element frequency band to the active mode is made to the base station device to make the deactivation request. On the other hand, based on the inactive mode setting information of the element frequency band transmitted from the base station apparatus, the element frequency band in which the radio link failure is detected is set to the inactive mode and transmitted from the base station apparatus in response to the activation request. Since the inactive mode element frequency band is set to the active mode based on the active mode setting information of the specified element frequency band, when the radio link failure is detected, the inactive mode is originally set. The turned which was component frequency band, as an alternative to the component frequency bands detects a radio link failure, it is possible to reuse the communication.

  (17) The mobile station apparatus of the present invention is a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands, and detects a radio link failure for each of the plurality of element frequency bands. When detecting a radio link failure with the radio resource control unit, an inactivation request to set the element frequency band in which the radio link failure is detected to an inactive mode, and the radio link failure in the inactive mode element frequency band are detected. While performing the reset request used for wireless communication with the base station apparatus instead of the element frequency band, and the activation request for setting the inactive mode element frequency band to the active mode, to the base station apparatus, Inactivation mode setting information, resetting information, and active mode of element frequency bands transmitted from the base station apparatus in response to the deactivation request, the reset request, and the activation request Based on a constant information, the radio link the component frequency bands detects a fault inert mode, is characterized in that and a scheduling unit that sets the inactive mode component frequency band to the awake mode.

  In this way, when a radio link failure is detected, an inactivation request for setting the element frequency band in which the radio link failure is detected to an inactive mode, and the inactive mode element frequency band as the element frequency band in which the radio link failure is detected Instead of making a reset request used for wireless communication with the base station apparatus and an activation request for setting the inactive mode to the active mode, the deactivation request and the reset request Based on the inactive mode setting information, reset information, and active mode setting information of the element frequency band transmitted from the base station apparatus in response to the activation request, the element frequency band in which the radio link failure is detected is set to the inactive mode. Since the inactive mode element frequency band is set to the active mode, when a radio link failure is detected, the element frequency band that was originally in the inactive mode is changed to the radio link failure. As an alternative to the detected component frequency bands, it is possible to reuse the communication.

  (18) The base station apparatus of the present invention is a base station apparatus that performs radio communication with a mobile station apparatus using a plurality of element frequency bands, and transmits the plurality of element frequency bands with the mobile station apparatus. When a radio link failure is detected from the radio transmitting / receiving unit to receive and the mobile station device, the deactivation request for setting the element frequency band in which the radio link failure has been detected to the inactive mode and the radio link failure have been detected. When a reset request for performing wireless communication with the base station apparatus using the inactive mode element frequency band instead of the element frequency band and an activation request for setting the inactive mode element frequency band to the active mode are received Includes instruction information for switching the element frequency band indicated in the deactivation request from the active mode to the deactivation mode, and the element frequency band indicated in the activation request. An instruction information for switching from the active mode to the active mode, and a base station side scheduling unit that generates the radio transmitting and receiving unit, while transmitting the two instruction information to the mobile station device, from the mobile station device It is characterized by receiving information indicating that the setting for setting the element frequency band to the inactive mode and the setting for setting the inactive mode element frequency band to the active mode have been completed.

  In this way, when a radio link failure is detected from the mobile station device, instead of the deactivation request to set the element frequency band in which the radio link failure is detected to the inactive mode and the element frequency band in which the radio link failure is detected If a reset request to perform wireless communication with the base station apparatus using the inactive mode element frequency band and an activation request to set the inactive mode element frequency band to the active mode are received, Since the instruction information for switching the indicated element frequency band from the active mode to the inactive mode and the instruction information for switching the element frequency band indicated in the activation request from the inactive mode to the active mode are generated, When the radio link failure is detected, the element frequency band that was originally in the inactive mode is replaced with the element frequency band in which the radio link failure is detected. It is possible to re-use the trust.

  According to the present invention, when a mobile station apparatus detects a radio link failure from a plurality of different component frequency bands, the connection of the component frequency band is released during the process procedure of the component frequency band in which no radio link failure is detected. The reconnection process can be suspended so as not to

It is a block diagram which shows schematic function structure of the mobile station apparatus which concerns on embodiment of this invention. It is a block diagram which shows schematic function structure of the base station apparatus which concerns on embodiment of this invention. 3 is a flowchart illustrating a radio link failure recovery method according to the first embodiment of the present invention. In the first embodiment of the present invention, a sequence chart showing an element frequency band resetting request made in a mobile station apparatus and a base station apparatus when a radio link failure is detected in an element frequency band other than the anchor element frequency band It is. 5 is a flowchart illustrating a radio link failure recovery method according to a second embodiment of the present invention. 5 is a flowchart illustrating a radio link failure recovery method according to a third embodiment of the present invention. 10 is a sequence chart showing a processing procedure for switching an element frequency band in which a radio link failure is detected from an active mode to an inactive mode in the third embodiment of the present invention. It is a sequence chart which shows the process sequence for switching an inactive mode element frequency band to active mode. 5 is a sequence chart showing an outline of a radio resource control layer connection establishment procedure in EUTRA. It is the figure which showed the notification method of the radio link failure (RLF) in the physical layer of the mobile station apparatus in EUTRA. It is the figure which showed the notification method of the radio link failure (RLF) in the medium access control (MAC) layer of the mobile station apparatus in EUTRA. It is the figure which showed the detection method of the radio link failure (RLF) in the radio link control (RLC) layer of the mobile station apparatus in EUTRA. 3 is a flowchart showing a radio link failure detection method for a physical layer of a mobile station device in EUTRA. 5 is a flowchart showing a radio link failure detection method of a medium access control layer of a mobile station device in EUTRA. 5 is a flowchart showing a radio link failure detection method of a radio link control layer of a mobile station apparatus in EUTRA.

  Before entering into a specific description of each embodiment, an outline of the communication technology used in the present invention will be briefly described.

(1) Interface protocol of each layer Each layer of the radio interface protocol between the mobile station apparatus and the network is L1 (first layer) based on a reference model of open system interconnection (hereinafter referred to as OSI). ), L2 (second layer), and L3 (third layer). The physical layer belonging to the first layer provides an information transmission service to an upper layer using a physical channel. Further, it is connected to a second layer medium access control (hereinafter referred to as MAC) layer through a transport channel (also referred to as a transmission channel). Data is transferred between the MAC layer and the physical layer through the transport channel.

  The MAC layer belonging to the second layer provides services such as resource allocation between the logical channel and the transport channel to the radio link control (Radio Link Control, hereinafter referred to as RLC) layer through the logical channel. The RLC layer supports reliable data transmission. Since the function of the RLC layer may be implemented by a functional block in the MAC layer, the RLC layer may not exist. In addition to the MAC layer and the RLC layer, the second layer includes a packet data convergence protocol (Packet Data Convergence Protocol, hereinafter referred to as PDCP) layer. The PDCP layer compresses the header information added to the packet data so that it can be efficiently transmitted over the wireless link, and performs packet order management to prevent data loss.

  A radio resource control (Radio Resource Control, hereinafter referred to as RRC) layer belonging to the third layer controls the transport channel and the physical channel in connection with the setting, reconfiguration, and release of the radio bearer. The RRC layer notifies the mobile station apparatus of system information and call information from the network, and also controls the first layer and the second layer necessary for them. It also controls radio resources between the mobile station device and the network.

(2) Physical channel Physical channels used in EUTRA and Advanced EUTRA include a physical broadcast information channel, a physical uplink data channel, a physical downlink data channel, a physical downlink control channel, a physical uplink control channel, and physical random access. Channel, downlink reference signal, uplink reference signal and the like are included. In EUTRA and Advanced EUTRA, the types of physical channels may be added in the future or the channel structure may be changed. Even when such a change is made, each embodiment of the present invention to be described later will be described. Applicable.

  A physical downlink control channel (PDCCH: Physical Downlink Control Channel) is a downlink channel transmitted from a base station apparatus to a mobile station apparatus, and is commonly used for a plurality of mobile station apparatuses. The base station apparatus uses a physical downlink control channel for transmission of transmission timing information and scheduling information (uplink / downlink resource allocation information). A physical downlink data channel (PDSCH: Physical Downlink Shared Channel) is a channel used for transmitting downlink data or paging information.

  A downlink reference signal (DL-RS: Downlink Reference Signal or Cell-specific Reference Signal) is transmitted from a base station apparatus to a mobile station apparatus using a physical downlink channel. The mobile station apparatus determines downlink reception quality by measuring a downlink reference signal. The reception quality is reported to the base station apparatus using a physical uplink control channel (PUCCH) as CQI (Channel Quality Indicator) which is a quality information indicator. The base station apparatus performs downlink communication scheduling for the mobile station apparatus based on the CQI notified from the mobile station apparatus.

  The reception quality includes SIR (Signal-to-Interference Ratio), SINR (Signal-to-Interference plus Noise Ratio), SNR (Signal-to-Noise Ratio). : Signal-to-noise power ratio), CIR (Carrier-to-Interference Ratio), BLER (Block Error Rate), path loss, etc. can be used.

  A physical broadcast information channel (PBCH: Physical Broadcast Channel) is transmitted for the purpose of notifying control parameters (broadcast information) that are commonly used by mobile station apparatuses in a cell. The broadcast information that is not notified on the physical broadcast information channel is transmitted using the physical downlink data channel with the radio resource notified on the physical downlink control channel. As broadcast information, a cell global ID indicating an individual ID (Identity) of the cell is notified.

  The physical uplink data channel (PUSCH: Physical Uplink Shared Channel) is a channel mainly used for transmitting uplink data (UL-SCH: Uplink Shared Channel). When the base station apparatus schedules the mobile station apparatus, the channel state information (downlink channel quality indicator CQI, precoding matrix indicator (PMI), rank indicator (RI: Rank Indicator) and downlink) An acknowledgment (ACK: Acknowledgement) / negative acknowledgment (NACK: Negative Acknowledgement) of a hybrid automatic repeat request (HARQ) for transmission is also transmitted using the physical uplink data channel (PUSCH).

  Here, uplink data (UL-SCH) indicates, for example, user data, and UL-SCH is a transport channel. In UL-SCH, HARQ and dynamic adaptive radio link control are supported, and beamforming can be used. UL-SCH supports dynamic resource allocation and quasi-static resource allocation.

  A physical uplink control channel (PUCCH) is a channel used for transmitting control data. Here, the control data is, for example, channel state information (CQI, PMI, RI) transmitted (feedback) from the mobile station apparatus to the base station apparatus, and resource allocation for the mobile station apparatus to transmit uplink data Scheduling request (SR: Scheduling Request) for requesting transmission (UL-SCH), HARQ ACK / NACK for downlink transmission, and the like.

  An uplink reference signal (UL-RS) is transmitted from a mobile station apparatus to a base station apparatus using an uplink channel. The base station apparatus determines the reception quality of the uplink radio transmission signal of the mobile station apparatus by measuring the uplink reference signal. The base station apparatus performs uplink communication scheduling based on the reception quality. The uplink reference signal is also used as a reference signal for calculating the amplitude, phase and frequency variation of the physical uplink data channel and demodulating a signal transmitted using the physical uplink data channel. A physical random access channel (PRACH) is a physical channel used for transmitting a random access preamble and has a guard time. The PRACH is mainly used for the mobile station apparatus to synchronize with the base station apparatus, and is used for initial access, handover, reconnection request, and scheduling request.

(3) Radio Resource Control Layer Connection Establishment FIG. 8 is a sequence chart showing an outline of a radio resource control layer connection establishment procedure in EUTRA. The radio resource control layer connection request means that when the mobile station apparatus is in an idle state (not wirelessly connected to the base station apparatus or in a standby state) when the mobile station apparatus makes an incoming call or makes a call from the mobile station apparatus, the mobile station apparatus Establishing radio resource connection by providing mobile station device information (UE CONTEXT) necessary for one-to-one communication with devices (communication of individual mobile station devices using dedicated channels) to the base station device and its upper control station Is to request. After completing the random access (initial access) with the base station device, the mobile station device transmits a radio resource control layer connection request to the base station device (step S101). In response to the received radio resource control layer connection request, the base station apparatus sets connection to the mobile station apparatus and transmits radio resource connection settings to the mobile station apparatus (step S102). If there is no problem with the received radio resource connection setting, the mobile station apparatus notifies the base station apparatus of completion of radio resource control layer connection setting (step S103).

(4) Radio Link Failure Notification Method in Each Layer of Mobile Station Device FIG. 9 is a diagram illustrating a radio link failure (RLF) notification method in each layer of the mobile station device in EUTRA. FIG. 9A is a diagram showing a radio link failure (RLF) notification method in the physical layer of the mobile station apparatus in EUTRA. In the physical layer, when the mobile station device is connected to the base station device and receives a downlink signal, a radio link failure is notified. The physical layer monitors the reception quality of the downlink signal transmitted from the base station apparatus. Two reception quality thresholds (downlink synchronization recovery determination threshold (Qin) and downlink synchronization error determination threshold (Qout)) are set in the physical layer.

  If the mobile station apparatus measures the downlink signal reception quality Qin or higher, it recognizes that sufficient power is transmitted to synchronize with the base station apparatus (synchronization recovery detection), and the downlink signal reception quality. Measures less than Qout and recognizes that insufficient power is transmitted to synchronize with the base station apparatus (synchronization error detection). The physical layer notifies the radio resource control layer of synchronization recovery or synchronization error every time. When the synchronization error detection is continuously notified a predetermined number of times, the radio resource control layer starts the synchronization protection timer, and if the synchronization recovery is not notified from the physical layer until the synchronization protection timer reaches the expiration time, the radio resource control layer The resource control layer determines that a radio link failure has occurred in the physical layer. When the reception quality is measured between Qin and Qout, the physical layer does not notify the radio resource control layer of synchronization recovery / synchronization error.

  FIG. 9B is a diagram illustrating a radio link failure (RLF) notification method in the medium access control (MAC) layer of the mobile station apparatus in EUTRA. In the MAC layer, a radio link failure is notified when random access is performed. When the mobile station apparatus transmits a preamble to the base station apparatus, the preamble transmission counter is used to measure the number of preamble transmissions. If the mobile station apparatus does not return a response to the preamble within a certain time after transmitting the preamble, the mobile station apparatus transmits the preamble again to the base station apparatus. When the number of preamble transmissions reaches a threshold set in advance by the base station device, the MAC layer of the mobile station apparatus notifies the RRC layer that the number of preamble transmissions has reached the threshold. The radio resource control layer that is notified that the number of preamble transmissions has reached the threshold value determines that a radio link failure has occurred in the MAC layer.

  FIG. 9C is a diagram illustrating a radio link failure (RLF) detection method in the radio link control (RLC) layer of the mobile station apparatus in EUTRA. In the RLC layer, a radio link failure is detected when performing an automatic repeat request procedure. When the mobile station apparatus transmits an acknowledge mode data protocol data unit (AMD PDU), when the NACK (Negative Acknowledgement) is returned from the base station apparatus, the mobile station apparatus transmits the AMD PDU again. Transmit and measure the number of AMD PDU transmissions. When the number of AMD PDU transmissions reaches the threshold, the RLC layer of the mobile station apparatus notifies the radio resource control layer that the number of AMD PDU transmissions has reached the threshold. The radio resource control layer that is notified that the number of AMD PDU transmissions has reached the threshold value determines that a radio link failure has occurred in the RLC layer. Here, the PDU is data to which protocol control information in a certain layer (here, RLC layer) is added. A detailed description of the detection procedure of the radio link failure in each layer will be made with reference to flowcharts.

  FIG. 10 is a flowchart showing a radio link failure detection method in the physical layer of the mobile station apparatus in EUTRA. When receiving the downlink signal transmitted from the base station apparatus, the physical layer of the mobile station apparatus determines whether or not synchronization recovery of the downlink signal has been detected (step S201). If it is less than the downlink synchronization recovery determination threshold (Qin) (step S201: NO), the physical layer of the mobile station device notifies the RRC layer of the mobile station device that synchronization recovery has been detected. Next, the RRC layer of the mobile station apparatus checks whether the synchronization protection timer has reached the expiration time (step S202). If the synchronization protection timer has not reached the expiration time (step S202: NO), the RRC layer of the mobile station device initializes the number of times of synchronization recovery detection (step S203). The RRC layer of the mobile station apparatus measures the number of synchronization error detections (step S204), and confirms whether the number of synchronization error detections has been detected continuously over a threshold (step S205).

  The RRC layer of the mobile station device activates a synchronization protection timer (step S206) when the number of synchronization error detections is detected continuously for a threshold value or more (step S205: YES). The RRC layer of the mobile station apparatus confirms whether or not the synchronization protection timer has reached the expiration time (step S205). When the physical layer of the mobile station apparatus detects the downlink signal synchronization recovery (S201: YES), the mobile station apparatus notifies the RRC layer of the mobile station apparatus of the synchronization recovery, and the RRC layer of the mobile station apparatus receives the notification. Then, the number of times of synchronization error detection is initialized (step S207). The RRC layer of the mobile station device measures the number of synchronization recovery detections (step S208). The RRC layer of the mobile station apparatus confirms whether or not the number of synchronization recovery detections has been continuously detected for a threshold or more (step S209). The RRC layer of the mobile station apparatus stops and initializes the synchronization protection timer when the number of synchronization recovery detections is continuously detected for a threshold value or more (step S209: YES) (step S210). When the synchronization protection timer reaches the expiration time (step S202: YES), the RRC layer of the mobile station apparatus recognizes that a radio link failure (RLF) has been detected (step S211).

  FIG. 11 is a flowchart showing a radio link failure detection method of the medium access control layer of the mobile station apparatus in EUTRA. When transmitting a random access preamble (sometimes simply referred to as a preamble) to the base station apparatus, the mobile station apparatus activates a preamble transmission counter (step S301). The mobile station apparatus determines whether or not random access has failed (step S302). If the random access fails (step S302: YES), the mobile station apparatus measures the number of preamble transmissions (step S303). The mobile station apparatus checks whether or not the number of preamble transmissions is equal to or greater than a threshold (step S304). When the number of preamble transmissions is equal to or greater than the threshold (step S304: YES), the medium access control layer of the mobile station apparatus notifies the radio resource control layer that the number of preamble transmissions has reached the threshold (step S305), and the radio link failure Is detected (step S306).

  FIG. 12 is a flowchart showing a radio link failure detection method of the radio link control layer of the mobile station apparatus in EUTRA. The mobile station apparatus activates a transmission counter when transmitting a confirmation mode data protocol data unit, which is a data unit of the radio link control layer, to the base station apparatus (step S401). The mobile station apparatus confirms that the transmission of the AMD PDU has succeeded when an ACK is returned from the base station apparatus (step S402). When transmission of AMD PDU fails (step S402: YES), that is, when NACK is returned from the base station apparatus, the mobile station apparatus measures the number of transmissions (step S403). The mobile station apparatus checks whether or not the number of transmissions is equal to or greater than a threshold value (step S404). If the number of transmissions is equal to or greater than the threshold (step S404: YES), the radio link control layer of the mobile station apparatus notifies the radio resource control layer that the number of transmissions has reached the threshold (step S405). It is detected (step S406).

  In consideration of the above matters, embodiments of the present invention will be specifically described below. In addition, if the number of downlink element frequency bands and the number of uplink element frequency bands are the same, the element frequency bands allocated to the mobile station apparatus correspond to the downlink and the uplink, respectively. When the number and the number of uplink element frequency bands are different, multiple downlink element frequency bands correspond to one uplink element frequency band, or multiple uplink element frequency bands correspond to one downlink element frequency band To do. Further, even if the number of downlink element frequency bands and the number of uplink element frequency bands are the same, a plurality of downlink element frequency bands are 1 as in the case where the number of downlink element frequency bands and the number of uplink element frequency bands are different. In some cases, it corresponds to one uplink element frequency band, or a plurality of uplink element frequency bands correspond to one downlink element frequency band. Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
The first embodiment will be described below. In the first embodiment, the element frequency band used for establishing the radio resource control layer connection is set as the anchor element frequency band, and all the element frequency bands are released only when a radio link failure is detected in the anchor element frequency band. .

  FIG. 1 is a block diagram showing a schematic functional configuration of a mobile station apparatus 1 according to the embodiment of the present invention. The mobile station apparatus 1 includes a transmission unit 101, a reception unit 103, a scheduling unit 105, and an antenna 107. The transmission unit 101 includes a data control unit 1011, a modulation unit 1013, and a wireless transmission unit 1015. In addition, the reception unit 103 includes a wireless reception unit 1031, a demodulation unit 1033, and a data extraction unit 1035.

  User data and control data are input from the upper layer (radio resource control unit) 109 to the data control unit 1011. The data control unit 1011 places the input data in the PUSCH or PUCCH according to an instruction from the scheduling unit 105. At this time, an uplink reference signal is also arranged. Modulation section 1013 performs data modulation and inserts discrete Fourier transform (hereinafter referred to as DFT), subcarrier mapping, inverse fast Fourier transform (hereinafter referred to as IFFT), and CP (Cyclic Prefix) insertion. Then, signal processing such as filtering is performed to generate a transmission signal. Modulation section 1013 then outputs the modulated signal to radio transmission section 1015. The radio transmission unit 1015 transmits the modulated data to the base station device 3 via the antenna 107 after up-converting the modulated data to a radio frequency. Radio receiving section 1031 receives the downlink signal from base station apparatus 3, down-converts it to a baseband signal, and outputs the received signal to demodulation section 1033.

  The demodulator 1033 demodulates the received data. The data extraction unit 1035 separates the received data into user data and control data. The data extraction unit 1035 outputs scheduling information, random access response messages, control data related to intermittent reception control, and other second layer control data to the scheduling unit 105 and outputs user data to the upper layer 109. The scheduling unit 105 analyzes the control data input from the data extraction unit 1035, generates uplink scheduling information, and assigns user data and control data to PUSCH and PUCCH based on the scheduling information. Section 1011 is instructed. The scheduling unit 105 includes a counter control unit 1051 and a timer control unit 1053, and starts and stops counters and timers related to the scheduling information based on scheduling information from the upper layer 109. The upper layer 109 performs processing of the MAC layer, RLC layer, PDCP layer, and RRC layer. Since the upper layer 109 controls the processing units of the lower layer in an integrated manner, there is an interface between the upper layer 109 and the scheduling unit 105, the antenna 107, the transmission unit 101, and the reception unit 103 (not shown) ).

  FIG. 2 is a block diagram showing a schematic functional configuration of the base station apparatus 3 according to the embodiment of the present invention. The base station apparatus 3 includes a transmission unit (wireless transmission / reception unit) 201, a reception unit (wireless transmission / reception unit) 203, a scheduling unit (base station side scheduling unit) 205, and an antenna 207. The transmission unit 201 includes a data control unit 2011, a modulation unit 2013, and a wireless transmission unit 2015. The reception unit 203 includes a wireless reception unit 2031, a demodulation unit 2033, and a data extraction unit 2035. The data control unit 2011 receives user data and control data, places control data on the PDCCH, and places transmission data and control data for each mobile station apparatus 1 on the PDSCH according to an instruction from the scheduling unit 205. The modulation unit 2013 performs signal processing such as data modulation, serial / parallel conversion of input signals, IFFT, CP insertion, and filtering, and generates a transmission signal. The radio transmission unit 2015 transmits the modulated data to the mobile station apparatus 1 via the antenna after up-converting the modulated data to a radio frequency.

  The radio reception unit 2031 receives an uplink signal from the mobile station apparatus 1, down-converts the signal into a baseband signal, and outputs received data to the demodulation unit 2033. The data extraction unit 2035 confirms the correctness of the received data and notifies the scheduling unit 205 of the confirmation result. If the received data is correct, the data extraction unit 2035 separates the received data into user data and control data. The data extraction unit 2035 outputs the control data of the second layer such as downlink channel quality indication information and the success / failure of the downlink data (ACK / NACK) in the control data to the scheduling unit 205, and the other layers. Control data such as the third layer and user data are output to the upper layer. If the received data is incorrect, the data extracting unit 2035 stores the received data for combining with the retransmitted data, and performs a combining process when the retransmitted data is received. The scheduling unit 205 performs scheduling for arranging user data and control data on the PDSCH and PDCCH. The upper layer 209 performs processing of the MAC layer, RLC layer, PDCP layer, and RRC layer. Since the upper layer 209 controls the processing units of the lower layer in an integrated manner, there is an interface between the upper layer 209 and the scheduling unit 205, antenna, transmission unit 201, and reception unit 203 (not shown). .

  FIG. 3 is a flowchart showing a radio link failure recovery method according to the first embodiment of the present invention. The mobile station apparatus 1 sets the element frequency band used for the radio resource control layer connection establishment procedure shown in FIG. 8 as an anchor element frequency band (Anchor Component Carrier) (step S501).

  The anchor element frequency band is, for example, a downlink element frequency band that the mobile station apparatus 1 accesses first. Alternatively, it is a downlink / uplink element frequency band that the base station device 3 individually designates to the mobile station device 1 using the RRC message. Or it is the downlink element frequency band with the highest priority of the downlink element frequency band included in the broadcast information. Or it is the arbitrary downlink element frequency band selected by judgment of the mobile station apparatus 1 among the downlink element frequency bands which the mobile station apparatus 1 is receiving. Alternatively, it is an element frequency band in which control information of all downlink / uplink element frequency bands allocated to the mobile station apparatus 1 can be allocated and transmitted / received. That is, in the mobile station apparatus 1 capable of transmitting and receiving a plurality of element frequency bands, in order to simplify the processing of the mobile station apparatus 1, or the element frequency band for monitoring cell search, radio link, etc. in the mobile station apparatus 1 The element frequency band is set in order to reduce the burden on the mobile station apparatus 1 by limiting the reception power in advance.

  Therefore, when a radio link failure is detected in the anchor element frequency band, it becomes impossible to confirm data and control information in other element frequency bands. Needs to release all element frequency bands. Thereafter, the mobile station apparatus 1 is connected to the base station apparatus 3 using a plurality of element frequency bands by carrier aggregation in accordance with instructions from the base station apparatus 3. Here, when the mobile station apparatus 1 detects a radio link failure from any one of a plurality of element frequency bands used for connection with the base station apparatus 3 (step S502), the mobile station apparatus 1 It is confirmed whether or not a failure has been detected in the anchor element frequency band (step S503).

  The radio link failure may be detected by any method shown in FIG. When a radio link failure is detected in the anchor element frequency band (step S503: YES), the mobile station device 1 releases connections in all element frequency bands (step S504). If the mobile station apparatus 1 does not detect a radio link failure in the anchor element frequency band (step S503: NO), the element frequency band in which the radio station failure is detected in the base station apparatus 3 using the anchor element frequency band. Is requested to be reset (step S505). Here, the resetting request is that the mobile station device 1 requests the base station device 3 to reset (change) the transmission frequency of the element frequency band designated by the mobile station device 1. However, the reset item of the element frequency band is not limited to the transmission frequency. In response to the reconfiguration request, the base station apparatus 3 may newly set another element frequency band having a transmission frequency different from the transmission frequency of the element frequency band designated by the mobile station apparatus 1, or the mobile station apparatus The element frequency band ID of the element frequency band designated by 1 may be the same, and only the transmission frequency may be reset.

  In the present embodiment, the mobile station apparatus 1 can determine the detection of the radio link failure for each element frequency band, or can determine which element frequency band is detected after detecting the radio link failure. it can. In response to the reconfiguration request, the mobile station device 1 identifies at least the identification information of the element frequency band that the mobile station device 1 requests to reconfigure (for example, the element frequency band ID, here, in particular, the element frequency band in which the radio link failure is detected) Include element frequency band ID) and parameters (items) that require resetting. Here, the parameter that the mobile station apparatus 1 requests to reset is mainly the transmission frequency, but in addition, the downlink / uplink transmission period and downlink / uplink of the element frequency band to be reset May include resource allocation information.

  The mobile station apparatus 1 performs reconnection when a radio link failure is detected in the anchor element frequency band, while making a reconfiguration request when a radio link failure is detected outside the anchor element frequency band. The element frequency band (radio resource) can be reset without releasing the connection state with the terminal 3. When a handover is performed, the anchor element frequency band may be reset to the element frequency band used for the initial access or to the element frequency band newly instructed from the handover destination base station apparatus 3. When reconnection processing due to a radio link failure is performed, the anchor element frequency band may be reset to the element frequency band used for the radio resource control layer connection request.

  FIG. 4 shows the reconfiguration of element frequency bands performed by the mobile station apparatus 1 and the base station apparatus 3 when a radio link failure is detected in an element frequency band other than the anchor element frequency band in the first embodiment of the present invention. It is a sequence chart which shows a setting request | requirement. When the mobile station apparatus 1 detects a radio link failure in an element frequency band other than the anchor element frequency band (step S601), the mobile station apparatus 1 resets the element frequency band in which the radio link failure is detected to the base station apparatus 3. Is requested (step S602). In response to the reset request from the mobile station device 1, the base station device 3 resets parameters (transmission frequency, transmission timing, etc.) of the element frequency band in which the radio link failure is detected (step S603). The base station apparatus 3 transmits the reset content to the mobile station apparatus 1 (step S604), and the mobile station apparatus 1 detects a radio link failure based on the information transmitted from the base station apparatus 3. If the parameter of the element frequency band is reset and completed, the base station apparatus 3 is notified that the resetting of the element frequency band is completed (step S605).

  In the first embodiment, when a radio link failure is detected outside the anchor element frequency band, a reconfiguration request is made using the anchor element frequency band, so the connection of the element frequency band due to the radio link failure is not released, Communication quality is improved. Further, since the wireless connection is not released when the wireless link failure other than the anchor element frequency band is detected, the connection between the mobile station apparatus 1 and the base station apparatus 3 is easily maintained.

<Second Embodiment>
Next, a second embodiment will be described. Since the functional configuration of the device in the second embodiment is the same as that shown in the first embodiment, the description thereof is omitted here. However, when the scheduling unit 105 detects a radio link failure, the scheduling unit 105 has a function of detecting a specific process in an element frequency band other than the element frequency band in which the radio link failure is detected. In the second embodiment, even if a radio link failure is detected, the reconnection process is not immediately performed, but the start of the reconnection process is temporarily suspended by the process being performed in another element frequency band, Prioritize processing in other element frequency bands. Here, the reconnection process is a process in which the mobile station apparatus 1 releases connections of all element frequency bands assigned to the mobile station apparatus 1 and performs from cell selection to radio resource control layer connection establishment. is there.

  FIG. 5 is a flowchart illustrating a radio link failure recovery method according to the second embodiment of the present invention. When the mobile station apparatus 1 detects a radio link failure (step S701), the mobile station apparatus 1 checks whether or not a specific process is being performed in an element frequency band other than the element frequency band in which the radio link failure is detected (step S702). . The radio link failure may be detected by any method shown in FIG. When the mobile station apparatus 1 is performing a specific process in an element frequency band other than the element frequency band in which the radio link failure is detected (step S702: YES), the reconnection process starts until the specific process is completed. Is suspended (step S703). When the specific process in the element frequency band in which the execution of the specific process is detected is completed (step S704), the mobile station apparatus 1 releases all the element frequency bands and starts the reconnection process that has been suspended. (Step S705).

  On the other hand, when the mobile station apparatus 1 determines that the specific processing is not performed outside the element frequency band in which the radio link failure is detected (step S702: NO), the connection of all the element frequency bands is immediately released. Perform reconnection processing. Here, the specific processing is random access, automatic retransmission request, or the like. By suspending the reconnection process during the random access, for example, the mobile station apparatus 1 can be prevented from transitioning to the idle state during the synchronization establishment process with the base station apparatus 3. Further, by holding the reconnection process during the automatic retransmission request, all important information to be transmitted by the mobile station apparatus 1 can be transmitted to the base station apparatus 3.

  In the present embodiment, the mobile station apparatus 1 can determine the detection of the radio link failure for each element frequency band, or can determine which element frequency band is detected after detecting the radio link failure. it can. In the second embodiment, when a radio link failure is detected, the radio resources (element frequency bands) secured by the mobile station device 1 are not released by considering the status of other element frequency bands being connected. By suspending the start of the reconnection process after the detection of the radio link failure, it is possible to minimize the influence on the element frequency band in which the specific process is performed. In particular, by holding the reconnection process during the automatic retransmission request, the mobile station apparatus 1 can transmit data such as downlink channel quality information to the base station apparatus 3, or the base station can complete the processing procedure of the element frequency band. The device 3 can be notified.

<Third Embodiment>
Next, a third embodiment will be described. Since the functional configuration of the device in the third embodiment is the same as that shown in the first embodiment, the description thereof is omitted here. In the third embodiment, when a radio link failure is detected in the downlink component frequency band or the uplink component frequency band, switching to the inactive mode is performed for the component frequency band in which the radio link failure is detected. , Avoid transition to reconnection processing procedure. Also, in mobile communication systems that transmit and receive multiple component frequency bands, it is possible to assume that a radio link failure has occurred accidentally, so it immediately transitions to reconnection processing and releases all connections in the component frequency bands. Thus, the communication efficiency can be maintained by maintaining the connection of the current element frequency band rather than setting a new element frequency band.

  In this embodiment, when a radio link failure is detected, the element frequency band in which the radio link failure is detected is set to the inactive mode without immediately transitioning to the reconnection processing, and the reconnection processing is suspended for a predetermined time. By doing so, the influence on the processing procedure of the element frequency band in which no radio link failure is detected is reduced.

  FIG. 6 is a flowchart illustrating a radio link failure recovery method according to the third embodiment of the present invention. When the mobile station device 1 detects a radio link failure (step S801), the mobile station device 1 switches the active / inactive mode to the base station device 3 in order to set the element frequency band in which the radio link failure is detected to the inactive mode. A request is made and the element frequency band in which the radio link failure is detected is switched to the inactive mode (step S802). When the processing procedure of the element frequency band other than the element frequency band in the inactive mode is completed, the mobile station device 1 transitions to the reconnection process. Here, the inactive mode is to temporarily stop transmission / reception of the element frequency band in a state where all the parameters of the element frequency band are stored without releasing or changing the element frequency band (radio resource). That is.

  FIG. 7A is a sequence chart showing a processing procedure for switching an element frequency band in which a radio link failure is detected from an active mode to an inactive mode in the third embodiment of the present invention.

  When the mobile station apparatus 1 detects a radio link failure, the mobile station apparatus 1 selects the element frequency band in which the radio link failure is detected as an element frequency band for switching from the active mode to the inactive mode (step S901). Next, an active / inactive mode switching request (inactivation request) is made to the base station apparatus 3 in order to set the element frequency band in which the radio link failure is detected to the inactive mode (step S902). In response to the request, the base station device 3 sets the element frequency band transmitted from the mobile station device 1 to the inactive mode (step S903). Then, the base station apparatus 3 notifies the mobile station apparatus 1 of the element frequency band set to the inactive mode (step S904). Upon receiving the notification from the base station device 3, the mobile station device 1 sets the element frequency band in which the radio link failure is detected to the inactive mode (step S905). Here, the active / inactive mode switching request includes information on the element frequency band that the mobile station apparatus 1 desires to enter the active mode or the inactive mode. When the switching to the inactive mode of the element frequency band in which the radio link failure is detected is completed, the mobile station device 1 notifies the base station device 3 that the active / inactive mode switching setting has been completed (step S906).

  In the third embodiment of the present invention, wireless communication with the base station apparatus may not be performed using all element frequency bands allocated to the mobile station apparatus due to limitations on transmission power and the like. All element frequency bands that are not temporarily used for wireless communication between base station apparatuses are treated as inactive modes. Therefore, the inactive mode element frequency band is set to the active mode and used for radio communication with the base station apparatus instead of the element frequency band in which the radio link failure is detected. FIG. 7B is a sequence chart showing a processing procedure for switching the inactive mode element frequency band to the active mode.

  When a radio link failure is detected in the mobile station device 1, the mobile station device 1 issues an active / inactive mode switching request (inactivation request) for switching the element frequency band in which the radio link failure is detected to the inactive mode. A request for resetting to use the inactive mode element frequency band for wireless communication and an active / inactive mode switching request for switching the inactive mode element frequency band to the active mode (activation) Request) to the base station apparatus. The mobile station apparatus 1 selects one element frequency band to be switched to the active mode from one or more inactive mode element frequency bands (step S1001). Next, in order to set the inactive mode element frequency band to the active mode, an active / inactive mode switching request (activation request) is made to the base station apparatus 3 (step S1002). In response to the request, the base station device 3 sets the element frequency band transmitted from the mobile station device 1 to the active mode (step S1003). Then, the base station device 3 notifies the mobile station device 1 of the element frequency band in the active mode (step S1004). In response to the notification from the base station device 3, the mobile station device 1 sets the element frequency band in which the radio link failure is detected to the active mode (step S1005). Here, the active / inactive mode switching request includes information on the element frequency band that the mobile station apparatus 1 desires to enter the active mode or the inactive mode. When the switching to the active mode of the selected inactive mode element frequency band is completed, the mobile station device 1 notifies the base station device 3 of the completion of the active / inactive mode switching setting (step S1006).

  In the third embodiment, the element frequency band in which the radio link failure is detected is temporarily set in the inactive mode, so that the reconnection process is temporarily suspended and the connection state with the base station apparatus 3 is maintained.

  In addition, you may make it implement | achieve the one part function of the base station apparatus 3 and the mobile station apparatus 1 in embodiment mentioned above with a computer. In that case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed.

  Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in the computer system. Further, the “computer-readable recording medium” dynamically holds a program for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It is also possible to include those that hold a program for a certain time, such as a volatile memory inside a computer system serving as a server or client in that case. The program may be a program for realizing a part of the functions described above, or may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

DESCRIPTION OF SYMBOLS 1 Mobile station apparatus 3 Base station apparatus 105 Scheduling part 205 Scheduling part 109 Upper layer 1015 Radio transmission part 1031 Radio reception part 2015 Radio transmission part 2031 Radio reception part

Claims (18)

A radio link failure recovery method for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands,
Setting any one element frequency band used for wireless connection with the base station apparatus as an anchor element frequency band;
Detecting a radio link failure for each of the plurality of element frequency bands;
Determining whether an element frequency band in which a radio link failure is detected is the anchor element frequency band; and
As a result of the determination, if the element frequency band in which a radio link failure is detected is the anchor element frequency band, releasing all element frequency bands allocated to the mobile station device;
As a result of the determination, if the element frequency band in which the radio link failure is detected is not the anchor element frequency band, the element frequency band that replaces the element frequency band in which the radio link failure has been detected in the anchor element frequency band is re-established. Performing a setting request to the base station device;
Re-setting the element frequency band based on element frequency band reset information transmitted from the base station apparatus in response to the reset request;
A radio link failure recovery method for a mobile station apparatus, comprising: notifying the base station apparatus that the resetting of the element frequency band is completed. A radio link failure recovery method for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands,
Detecting a radio link failure for each of the plurality of element frequency bands;
Determining whether a specific process is being performed in an element frequency band other than the element frequency band in which the radio link failure is detected when a radio link failure is detected;
As a result of the determination, if specific processing is performed in an element frequency band other than the element frequency band in which the radio link failure is detected, the specification in an element frequency band other than the element frequency band in which the radio link failure is detected A method of recovering a radio link failure of a mobile station apparatus, comprising: at least a step of holding a reconnection process until the above process is completed.   As a result of the determination, if specific processing is performed in an element frequency band other than the element frequency band in which the radio link failure is detected, the specification in an element frequency band other than the element frequency band in which the radio link failure is detected 3. The radio link failure recovery method for a mobile station apparatus according to claim 2, further comprising a step of suspending release of radio resources in the element frequency band in which the radio link failure is detected until the processing of step (2) is completed. A radio link failure recovery method for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands,
Detecting a radio link failure for each of the plurality of element frequency bands;
When a radio link failure is detected, a deactivation request is made to the base station apparatus to set an element frequency band in which the radio link failure is detected to an inactive mode;
Based on the inactive mode setting information of the element frequency band transmitted from the base station apparatus in response to the deactivation request, setting the element frequency band in which the radio link failure is detected to an inactive mode;
A radio link failure recovery method for a mobile station apparatus, comprising: at least a step of notifying the base station apparatus that the setting to set the element frequency band to the inactive mode is completed. A mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands,
A radio reception unit that receives the plurality of element frequency bands from the base station device;
A scheduling unit for setting any one element frequency band used for wireless connection with the base station apparatus as an anchor element frequency band;
A radio link failure is detected for each of the plurality of element frequency bands, and it is determined whether the element frequency band in which the radio link failure is detected is the anchor element frequency band. As a result of the determination, a radio link failure is detected. If the element frequency band is the anchor element frequency band, a radio resource control unit that releases all element frequency bands allocated to the mobile station device,
A mobile station apparatus comprising: a radio transmission unit that transmits the plurality of element frequency bands to the base station apparatus. The radio resource control unit
As a result of the determination, if the element frequency band in which the radio link failure is detected is not the anchor element frequency band, the element frequency band that replaces the element frequency band in which the radio link failure is detected in the anchor element frequency band is re-established. The mobile station apparatus according to claim 5, wherein a setting request is made to the base station apparatus. The radio resource control unit
The mobile station apparatus according to claim 6, wherein the element frequency band is reset based on element frequency band reset information transmitted from the base station apparatus in response to the reset request. The radio resource control unit
The mobile station apparatus according to claim 7, wherein the base station apparatus is notified that the resetting of the element frequency band is completed. A mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands,
A radio reception unit that receives the plurality of element frequency bands from the base station device;
A radio resource control unit that detects a radio link failure for each of the plurality of element frequency bands;
A scheduling unit that determines whether or not specific processing is being performed in an element frequency band other than the element frequency band in which the radio link failure is detected when a radio link failure is detected;
A mobile station apparatus comprising: a radio transmission unit that transmits the plurality of element frequency bands to the base station apparatus. The scheduling unit includes
As a result of the determination, if specific processing is performed in an element frequency band other than the element frequency band in which the radio link failure is detected, the specification in an element frequency band other than the element frequency band in which the radio link failure is detected The mobile station apparatus according to claim 9, wherein the reconnection process is suspended until the process is completed. The scheduling unit includes
As a result of the determination, if specific processing is performed in an element frequency band other than the element frequency band in which the radio link failure is detected, the specification in an element frequency band other than the element frequency band in which the radio link failure is detected The mobile station apparatus according to claim 10, wherein release of radio resources in the element frequency band in which the radio link failure is detected is suspended until the process of (1) is completed. A mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands,
A radio resource control unit that detects a radio link failure for each of the plurality of element frequency bands;
When a radio link failure is detected, an inactivation request is made to the base station apparatus to set the element frequency band in which the radio link failure is detected to an inactive mode. A mobile station comprising: a scheduling unit configured to set the element frequency band in which the radio link failure is detected to an inactive mode based on the inactive mode setting information of the element frequency band transmitted from the base station apparatus. apparatus.   The mobile station apparatus according to claim 12, wherein the scheduling section notifies the base station apparatus that the setting for inactivating the element frequency band has been completed. A base station apparatus that performs radio communication with a mobile station apparatus using a plurality of element frequency bands,
A radio transceiver for transmitting and receiving the mobile station apparatus and the plurality of element frequency bands;
When a request for resetting an element frequency band that substitutes for an element frequency band in which a radio link failure has been detected is received from the mobile station device, the parameter including the transmission frequency information is reset, and the element frequency band reset information A base station side scheduling unit for generating
The radio transmission / reception unit transmits the reset information to the mobile station apparatus, and receives information indicating that the resetting of the element frequency band is completed from the mobile station apparatus. A base station apparatus that performs radio communication with a mobile station apparatus using a plurality of element frequency bands,
A radio transceiver for transmitting and receiving the mobile station apparatus and the plurality of element frequency bands;
When a radio link failure is detected from the mobile station apparatus and an inactivation request is received to set the element frequency band in which the radio link failure is detected to an inactive mode, the deactivation request is indicated. A base station side scheduling unit for generating instruction information for switching the element frequency band from the active mode to the inactive mode,
The radio transmitting / receiving unit transmits the instruction information to the mobile station apparatus, and receives information indicating that the setting for setting the element frequency band to the inactive mode is completed from the mobile station apparatus. Station equipment. A radio link failure recovery method for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands,
Detecting a radio link failure for each of the plurality of element frequency bands;
When a radio link failure is detected, a deactivation request is made to the base station apparatus to set an element frequency band in which the radio link failure is detected to an inactive mode;
Performing a reconfiguration request for using the inactive mode element frequency band for communication with the base station device to the base station device;
Performing an activation request for setting the inactive mode element frequency band to the active mode to the base station device;
Based on the inactive mode setting information of the element frequency band transmitted from the base station apparatus in response to the deactivation request, setting the element frequency band in which the radio link failure is detected to an inactive mode;
Setting the inactive mode element frequency band to the active mode based on the active mode setting information of the element frequency band transmitted from the base station apparatus in response to the activation request;
Notifying to the base station device that the setting of the element frequency band in which the radio link failure is detected to be in an inactive mode is completed;
A radio link failure recovery method for a mobile station apparatus, comprising: at least a step of notifying the base station apparatus that the setting to set the inactive mode element frequency band to the active mode is completed. A mobile station apparatus that performs radio communication with a base station apparatus using a plurality of element frequency bands,
A radio resource control unit that detects a radio link failure for each of the plurality of element frequency bands;
When a radio link failure is detected, an inactivation request to set the element frequency band in which the radio link failure is detected to an inactive mode, and the inactive mode element frequency band in place of the element frequency band in which the radio link failure is detected A reconfiguration request used for wireless communication with the base station device and an activation request to activate the inactive mode element frequency band to the base station device, while the deactivation request The radio link failure is detected based on the inactive mode setting information, the reset information, and the active mode setting information of the element frequency band transmitted from the base station apparatus in response to the reset request and the activation request. And a scheduling unit for setting the inactive mode element frequency band to the inactive mode and the inactive mode element frequency band to the active mode. . A base station apparatus that performs radio communication with a mobile station apparatus using a plurality of element frequency bands,
A radio transceiver for transmitting and receiving the mobile station apparatus and the plurality of element frequency bands;
When a radio link failure is detected from the mobile station apparatus, an inactivation request to set the element frequency band in which the radio link failure is detected to an inactive mode and an element frequency band in which the radio link failure is detected are not used. When receiving a reset request for performing wireless communication with the base station apparatus using the active mode element frequency band and an activation request for setting the inactive mode element frequency band to the active mode, the deactivation request A base that generates instruction information for switching the element frequency band indicated in FIG. 2 from the active mode to the inactive mode, and instruction information for switching the element frequency band indicated in the activation request from the inactive mode to the active mode. A station side scheduling unit,
The wireless transmission / reception unit transmits the two instruction information to the mobile station apparatus, while the mobile station apparatus sets an element frequency band to an inactive mode and an inactive mode element frequency band to an active mode. A base station apparatus that receives information indicating completion.

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