Abstract: A transmitter apparatus (10) includes: an MAC-PDU generator section (11) configured to generate an MAC-PDU by multiplexing one or more variable-length information elements each being any one of an MAC-SDU received from an RLC layer, control information, and padding information; and an MAC-PDU transmitter section (13) configured to transmit the generated MAC-PDU. The MAC-PDU generator section (13) is configured to add an MAC header including LI indicating sizes of a plurality of information elements, when the plurality of information elements is multiplexed into the MAC-PDU, and the number of pieces of the LI included in the MAC header is one number smaller than the number of the information elements being multiplexed.

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: 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 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 synchronization control method in a communication system including a mobile station and a base station includes generating a synchronization request at the base station when data addressed to the mobile station arrives, receiving the synchronization request from the base station at the mobile station, transmitting feedback information at the mobile station as a response to the synchronization request, receiving the feedback information at the base station, generating timing advance information at the base station based on a reception timing of the feedback information, transmitting the timing advance information from the base station to the mobile station, and adjusting a transmission timing of uplink data at the mobile station, based on the timing advance information.

Abstract: A communication control method used by a base station to allocate a radio resource to a user terminal which performs different-frequency measurement includes the steps of transmitting to the base station, by the user terminal, a request indicating whether a measurement gap for different-frequency measurement is needed, when a need for data communications between the user terminal and the base station arises while the user terminal is performing discontinuous reception; and controlling, by the base station, the radio resource allocated to the user terminal based on whether the measurement gap is needed.

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 user apparatus in a mobile communication system includes: a unit configured to receive a downlink control signal using a frequency of a residing cell; and a unit configured to perform cell search using a frequency different from the frequency of the residing cell during an interval between reception timings of the downlink control signal in response to an occurrence of a predetermined event for different frequency measurement in the user apparatus or a base station apparatus. When the reception timing interval of the downlink control signal is not longer than the threshold reported from the base station apparatus, and when the predetermined event for different frequency measurement occurs in the user apparatus or the base station apparatus, different frequency measurement is performed in a cycle, different from the reception timing interval, reported from the base station apparatus.

Abstract: A mobile station (UE) is configured to establish uplink synchronization with a radio base station (eNB). The mobile station (UE) is configured not to return transmission acknowledgment information for downlink data until receiving a command for adjusting uplink transmission timing, when the radio base station (eNB) allocates a radio resource for transmission of the downlink data to the mobile station (UE).

Abstract: A method of generating a control signal is disclosed. The method includes the steps of: generating one or more control messages to be transmitted; and multiplexing the one or more control messages to generate a control message block to generate the control signal to be transmitted in a transport channel, wherein the control message block varies in length according to the number of control messages multiplexed and the size of the control messages; and wherein information on the number of control messages multiplexed and/or the size of the respective control messages is not included in the control signal.

Abstract: A mobile station (UE) is configured to notify, to a radio base station (eNB), a preamble for RACH included in an uplink synchronization request transmitted by the radio base station by using an asynchronous RACH; notify, to the radio base station (eNB), the preamble, when failing to receive a TA command transmitted by the radio base station (eNB); and release the preamble, when a validity period of the preamble is passed.

Abstract: A mobile station is configured to send a base station a buffer status report explicitly indicating that the amount of a transmission signal in a buffer of the mobile station has become zero. This configuration makes it possible to efficiently allocate radio resources of an uplink shared channel and thereby to increase uplink capacity.

Abstract: A disclosed method of controlling a change of a transmission parameter including the steps of generating a control data unit which does not include a specification of the change timing for changing a parameter value of the transmission parameter for which processing all within a certain layer or sublayer is possible; transmitting the control data unit only in a first half of a transmission frame; and conducting transmission and/or reception, at a timing of a frame following a frame in which the control data unit was transmitted, based on the changed transmission parameter.

Abstract: A transmitter apparatus includes: an MAC-SDU receiver section (11) configured to receive an MAC-SDU in an MAC layer from an RLC layer; an MAC-PDU generator section (13) configured to generate an MAC-PDU by multiplexing the received MAC-SDU; and an MAC-PDU transmitter section (14) configured to transmit the generated MAC-PDU, MAC header added in the MAC-PDU includes fixed-length “LI” indicating a size of the MAC-SDU multiplexed into the MAC-PDU, and the RLC layer is configured to transmit the MAC-SDU to the MAC layer, the size of the MAC-SDU being not larger than a maximum size settable by the fixed-length “LI”.

Abstract: A base station apparatus includes a unit configured to determine a discontinuous reception pattern for a user apparatus that is classified according to a channel state of a radio link; and a unit configured to report the discontinuous reception pattern to the user apparatus. The discontinuous reception pattern specifies at least a cycle of discontinuous reception.

Abstract: A retransmission control method according to the present invention includes a physical control channel transmitting step of transmitting, at a transmitting side apparatus 10, a new data indicator updated upon transmission of a new packet, through a physical control channel associated with a physical data channel; and a transmission acknowledgement information transmitting step of performing, at a receiving side apparatus 30, decoding processing on a packet received through the physical data channel at a current transmission opportunity, and transmitting, at the receiving side apparatus 30, transmission acknowledgment information on the packet on the basis of a result of the decoding processing, even when the receiving side apparatus 30 has transmitted transmission acknowledgement information indicating a success of reception of a packet at a last transmission opportunity, and when a new data indicator received through the physical control channel at the current transmission opportunity is not updated.

Abstract: An upper node station for transmitting received packets to a mobile station via a base station includes a quality information extracting unit configured to extract quality information from the received packets; and a multiplexing unit configured to assign each of the received packets to a bearer service based on the extracted quality information to multiplex the received packets. The upper node station may further include a quality information management table configured to associate a packet header with the bearer service for each mobile station, and the multiplexing unit may identify the bearer service based on a packet header in each of the received packets referring to the quality information management table.

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.

Abstract: One object of the present invention is to provide a simple layer 2 protocol that makes it possible to adaptively retransmit data by the RLC layer according to the variation of radio channel conditions without increasing the number of PDU headers. A disclosed radio communication method includes the steps of determining whether a unit data block is to be transmitted for the first time by the RLC layer or to be retransmitted; if the unit data block is to be retransmitted, determining whether it is possible to retransmit the unit data block with a transmission time interval used for the first transmission; and if it is not possible to retransmit the unit data block with the transmission time interval used for the first transmission, setting a transmission time interval longer than the transmission time interval used for the first transmission for a downlink channel and/or an uplink channel.

Abstract: Information processing equipment is provided that can be operated continuously and stably for a long time due to improved stability during alternately switching between the batteries being used and, therefore, can maintain the reliability of the operation of switching the batteries being used over a long period. The information processing equipment includes battery housing portions configured to individually house a plurality of batteries; battery lids that are provided corresponding respectively to the plurality of batteries, that are opened and closed independently during attachment or removal of the batteries, and that are provided with magnets serving as magnetic-field-generating portions; magnetic-field-detecting elements that detect the strength of a magnetic field from the magnetic-field-generating portions; and a control microcomputer that controls a power-drawing portion based on a detection result obtained by the magnetic-field-detecting elements so as to change the switch.