Transmission restarting method, mobile station and radio base station
AssigneeNtt Docomo, Inc.
InventorsAtsushi Harada, Hiroyuki Ishii, Anil Umesh, Minami Ishii
Life of this patent
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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.
Claims16
A transmission restarting method of restarting transmission of downlink user data to a mobile station in a discontinuous reception state, comprising the steps of:
- allocating, at a radio base station, a data series for identifying the mobile station, to the mobile station;
- transmitting, at the radio base station, an uplink synchronization request to the mobile station, the uplink synchronization request designating the allocated data series;
- notifying, at the mobile station, the radio base station of the data series designated by the uplink synchronization request, when successfully receiving the uplink synchronization request;
- creating, at the radio base station, a command for adjusting uplink transmission timing, and transmitting the command to the mobile station, when receiving the data series from the mobile station;
- restarting, at the radio base station, transmission of the downlink user data to the mobile station, when not receiving the data series from the mobile station until a predetermined period is passed after transmission of the command;
- creating, at the radio base station, the command, and transmitting the command to the mobile station, when receiving the data series from the mobile station before the predetermined period is passed after transmission of the command;
- releasing, at the mobile station and the radio base station, the data series, when a validity period of the data series is passed;
- and
- allocating, at the radio base station, a new data series to the mobile station, when the data series is released.
A mobile station configured to restart continuous reception of downlink user data in a discontinuous reception state, wherein the mobile station is configured to:
- notify, to a radio base station, a data series designated by an uplink synchronization request transmitted by the radio base station, when successfully receiving the uplink synchronization request;
- notify, to the radio base station, the data series, when failing to receive a command for adjusting uplink transmission timing, the command transmitted by the radio base station;
- and
- release the data series, when a validity period of the data series is passed.
A radio base station configured to restart transmission of downlink user data to a mobile station in a discontinuous reception state, wherein the radio base station is configured to:
- allocate a data series for identifying the mobile station, to the mobile station, and transmit an uplink synchronization request to the mobile station, the uplink synchronization request designating the allocated data series;
- create a command for adjusting uplink transmission timing and transmit the command to the mobile station, when receiving the data series from the mobile station;
- restart transmission of the downlink user data to the mobile station, when not receiving the data series from the mobile station until a predetermined period is passed after transmission of the command;
- create the command and transmit the command to the mobile station, when receiving the data series from the mobile station before the predetermined period is passed after transmission of the command;
- and
- release the data series and allocate a new data series to the mobile station, when a validity period of the data series is passed.
Dependencies are inferred from the claim text.