Abstract: A base station apparatus includes a classification unit configured to classify user apparatuses based on channel state of a radio link, a DRX (Discontinuous Reception) status memory configured to store information indicating which of multiple groups each of one or more of the user apparatuses conducting DRX belongs to, a determination unit configured to determine which of the groups the user apparatuses classified by the classification unit are to belong to with reference to the information stored in the DRX status memory, and an indication unit configured to indicate the determined groups to the user apparatuses. Each of the groups includes one or more of the user apparatuses activating simultaneously. The determination unit is configured to assign one of the user apparatuses having relatively poor channel state to one of the groups having a smaller number of simultaneously activating user apparatuses.

Abstract: A base station (100) includes: a scheduling unit (106) configured to use, for a particular radio bearer, any one of a persistent scheduling in which data addressed to a mobile station (200) is transmitted at a predetermined timing, and a non-persistent scheduling in which a transmission opportunity is assigned to data addressed to a mobile station having a favorable reception condition; a control information generating unit (110) configured to generate control information to be used in the persistent scheduling; a control information notifying unit (112) configured to notify, to the mobile station, the control information; and a switching notifying unit (112) configured to notify, to the mobile station (200), that a scheduling to be used for the particular bearer should be switched from the non-persistent scheduling to the persistent scheduling, wherein the scheduling unit (106) is configured to switch the scheduling to be used for the particular radio bearer, from the non-persistent scheduling to the persist

Abstract: A communication apparatus includes an error detection unit conducting error detection on N packet data units received in N transmission processes; a first transmission unit transmitting an affirmative response signal or a first retransmission request signal depending on a result of the error detection; a storage unit storing an affirmatively responding packet for forwarding to an upper layer; a second transmission unit, if affirmatively responding packets are not consecutive, determining whether a missing packet must be retransmitted and transmitting a second retransmission request signal; and a forwarding unit reordering the packet data units and forwarding the packets in the storage unit to the upper layer.

Abstract: A radio communication method in which a mobile station receives signaling information transmitted by a base station via a shared control channel, detects a presence/absence of data addressed to the mobile station, demodulates a shared data channel when the data is present, and receives data transmitted by the base station. The method includes the steps of transmitting, from the base station to the mobile station, a synchronization request via the shared control channel and transmitting, at the mobile station, feedback information including channel quality information, as a response to the synchronization request, via a random access channel. The method also includes generating, at the base station, timing advance information when receiving the feedback information, and transmitting, from the base station to the mobile station, the timing advance information, and adjusting, at the mobile station, a transmission timing of uplink data based on the timing advance information.

Abstract: In a transmission restarting method of restarting transmission of downlink user data to a mobile station (UE) in a discontinuous reception state; a radio base station (eNB) allocates a radio resource for downlink data transmission to the mobile station (UE), and notifies, to the mobile station (UE), the allocated radio resource for downlink data transmission; the radio base station (eNB) restarts transmission of downlink user data to the mobile station (UE) by using the allocated radio resource for downlink data transmission; and the radio base station (eNB) stops transmission of the downlink user data when a predetermined condition is detected.

Abstract: A radio base station (eNB) is configured to start the transmitting-side timer and a Polling timer which is set to expire earlier than the transmitting-side, upon transmission of a last piece of downlink data accumulated in a transmission buffer to the mobile station. When the Polling timer expires, the radio base station (eNB) notifies the mobile station (UE) of the expiration, and restarts the transmitting-side timer, and the mobile station (UE) restarts a receiving-side timer in response to the notification.

Abstract: A communication apparatus includes an error detection unit conducting error detection on N packet data units received in N transmission processes; a first transmission unit transmitting an affirmative response signal or a first retransmission request signal depending on a result of the error detection; a storage unit storing an affirmatively responding packet for forwarding to an upper layer; a second transmission unit, if affirmatively responding packets are not consecutive, determining whether a missing packet must be retransmitted and transmitting a second retransmission request signal; and a forwarding unit reordering the packet data units and forwarding the packets in the storage unit to the upper layer.

Abstract: A mobile communication method according to the present invention includes the steps of: (A) activating, at the radio base station (eNB), a first timer, upon transmission of a downlink data signal to the mobile station (UE) operating in a continuous reception cycle; (B) transmitting, from the radio base station (eNB) to the mobile station (UE), a change instruction instructing the mobile station (UE) to change a reception cycle of the mobile station (UE) from the continuous reception cycle to a first discontinuous reception cycle, and releasing the uplink dedicated resources, when the first timer expires with no downlink data signal transmitted after the activation of the first timer; and (C) changing, at the mobile station (UE), the reception cycle of the mobile station (UE) from the continuous reception cycle to the first discontinuous reception cycle, and releasing the uplink dedicated resources, in response to the received change instruction.

Abstract: A base station according to the present invention includes: a data storage unit 119 configured to temporarily store user data, when the base station transmits and receives the user data to and from a mobile station; an identifier adding unit 116 configured to add, to the user data stored in the data storage unit, a transfer identifier which indicates that the user data is transferred to an other base station by a handover, when the mobile station performs the handover from the base station to the other base station; and a data transfer unit 118 configured to transfer, to the other base station through a transfer apparatus, the user data to which the transfer identifier is added.

Abstract: According to a chain saw braking system, engagement between a front end portion of a belt and a main body by an engagement member is released at the time of application of an impact. When a front end portion is pulled by the spring force of a compression coil spring, an elongate hole for protrusion is engaged with a protrusion to restrict a rear end portion from being moved in the same direction as the front end portion. Thus, it is possible to strongly tighten a drum by the belt to thereby reliably stop the movement of a chain. With this arrangement, the chain can be prevented from being damaged when a chain saw is accidentally dropped onto the ground due to an impact applied thereto.

Abstract: In a pendulum centrifugal clutch, a shoe is provided in a manner rotatable about a boss, and a fitting hole that rotatably fits with the boss is provided to the shoe. The fitting hole is bored on a thin portion formed by reducing a thickness of a shoe body from first and second sides of the shoe body. The thin portion is interposed between a brim provided to a first axial end of the boss and a plate brought adjacent to a second axial end of the boss.

Abstract: A disclosed communication system includes a base station and mobile stations. The base station includes a group management unit configured to classify the mobile stations into groups according to signal quality information transmitted from the mobile stations, a storing unit configured to store correspondence information on the correspondence between the groups and subframes constituting at least a part of a radio frame, a scheduling unit configured to schedule packets for the mobile stations according to the correspondence information, and a transmitting unit configured to transmit the correspondence information to the mobile stations. Each mobile station includes a transmitting unit configured to transmit the signal quality information indicating received signal quality to the base station, and a receiving unit configured to receive the packets transmitted from the base station in one of the subframes that corresponds to one of the groups to which the mobile station belongs.

Abstract: A disclosed base station apparatus includes: a TTI-length determining unit which determines, based on downlink receive quality information transmitted from a mobile station, whether data is to be transmitted in a first TTI with, as a unit, a predetermined period no shorter than a subframe length, or in a second TTI with, as a unit, a period shorter than the first TTI; a number-of-subframes determining unit which determines a number of subframes making up the determined TTI; a reporting unit which reports the determined TTI and the number of subframes making up the determined TTI to the mobile station; and a scheduler which performs scheduling based on the determined TTI and the number of subframes making up the determined TTI.

Abstract: In a retransmission-request transmitting method, the receiving side apparatus activates a reordering timer, when receiving a first packet before receiving an unreceived packet with a sequence number smaller than a sequence number of the first packet; triggers transmission of a retransmission request for the unreceived packet, when having not received the unreceived packet by the time of expiration of the reordering timer activated in response to the receipt of the first packet; and stops and reactivates the reordering timer activated in response to the receipt of the first packet, when a value of the sequence number of the first packet falls out of a range of the receiving side window as a result of changing the upper limit value and the lower limit value in accordance with a sequence number of a second packet received from the transmitting side apparatus.

Abstract: A radio communication method in which a mobile station receives signaling information transmitted by a base station via a shared control channel, detects a presence/absence of data addressed to the mobile station, demodulates a shared data channel when the data is present, and receives data transmitted by the base station. The method includes the steps of transmitting, from the base station to the mobile station, a synchronization request via the shared control channel and transmitting, at the mobile station, feedback information including channel quality information, as a response to the synchronization request, via a random access channel. The method also includes generating, at the base station, timing advance information when receiving the feedback information, and transmitting, from the base station to the mobile station, the timing advance information, and adjusting, at the mobile station, a transmission timing of uplink data based on the timing advance information.

Abstract: A control channel allocation apparatus includes a memory portion that stores an identifier indicating a layer 1 control channel associated with a downlink data channel, and a physical channel parameter for transmitting an uplink layer 1 control channel, the identifier being related to the physical channel parameter; a physical layer parameter determination portion that determines the physical channel parameter for transmitting the uplink layer 1 control channel in accordance with the identifier; a layer 1 control channel generation portion that generates a layer 1 control channel indicating a decoding result of a data channel, in accordance with the determined physical channel parameter; and a transmission portion that transmits the generated layer 1 control channel.