1. A radio communication system comprising:
a base station device; and
a plurality of mobile station devices each configured to perform radio communication with the base station device,
wherein the base station device comprises:
a first radio unit configured to select and transmit information indicative of a preamble number of a preamble assigned to one of the plurality of mobile station devices and information indicative of an assignment period of the preamble, the preamble being dedicated for non-contention based random access; and
a random access response generator configured to generate a random access response upon receipt of the preamble transmitted from the one of the plurality of mobile station devices, the random access response to be transmitted from the first radio unit, and each of the plurality of mobile station devices comprises:
a second radio unit configured to receive and detect the information indicative of the preamble number and the information indicative of the assignment period;
a transmitter configured to transmit the preamble corresponding to the preamble number indicated by the received information; and
an upper layer processor configured to perform control so as:
to retransmit the transmitted preamble in a case that the random access response to the transmitted preamble is not received within a predetermined time window and after the predetermined time window the assignment period that is longer than the predetermined time window has not expired, and
not to retransmit the transmitted preamble in a case that the assignment period that is longer than the predetermined time window has expired.
2. A mobile station device comprising:
a radio unit configured to receive, from a base station device, information indicative of a preamble number of an assigned preamble assigned by the base station device and to receive information indicative of an assignment period of the assigned preamble and to receive a random access response including the preamble number, wherein
the assignment period being used to limit retransmission of the assigned preamble, and
the assigned preamble being dedicated for non-contention based random access;
a transmitter configured to transmit the assigned preamble corresponding to the preamble number indicated by the received information; and
an upper layer processor configured to perform control of the mobile station device so as:
to retransmit the transmitted preamble in a case that the random access response to the transmitted preamble is not received within a predetermined time window and after the predetermined time window the assignment period that is longer than the predetermined time window has not expired, and
not to retransmit the transmitted preamble in a case that the assignment period that is longer than the predetermined time window has expired.
3. A random access method for a radio communication system comprising a base station device and a plurality of mobile station devices configured to perform radio communication with the base station device, the random access method comprising:
selecting and transmitting, from the base station device, information indicative of a preamble number of a preamble assigned to one of the plurality of mobile station devices and information indicative of an assignment period of the preamble, the preamble being dedicated for non-contention based random access;
receiving and detecting, in the one of the plurality of mobile station devices, the information indicative of the preamble number and the information indicative of the assignment period;
transmitting, from the one of the plurality of mobile station devices, the preamble corresponding to the preamble number indicated by the received information;
transmitting, from the base station device, a random access response upon receipt of the preamble transmitted from the one of the plurality of mobile station devices; and
retransmitting, from the one of the plurality of mobile station devices, the transmitted preamble in a case that the random access response to the transmitted preamble is not received within a predetermined time window and after the predetermined time window the assignment period that is longer than the predetermined time window has not expired, and
not performing, from the one of the plurality of mobile station devices, the retransmission in a case that the assignment period that is longer than the predetermined time window has expired.
4. A base station device, comprising:
a radio unit configured to select and transmit, to a mobile station device, information indicative of a preamble number of an assigned preamble assigned by the base station device and to transmit information indicative of an assignment period of the assigned preamble and to transmit a random access response including the preamble number, wherein
the assignment period being used to limit retransmission of the assigned preamble, and
the assigned preamble being dedicated for non-contention based random access, the radio unit configured to receive the assigned preamble corresponding to the preamble number indicated by the transmitted information;
a random access response generator configured to generate the random access response upon receipt of the assigned preamble transmitted from the mobile station device; and
an upper layer processor configured to perform control of the mobile station device so as:
to retransmit the transmitted preamble in a case that the random access response to the transmitted preamble is not received within a predetermined time window and after the predetermined time window the assignment period that is longer than the predetermined time window has not expired, and
not to retransmit the transmitted preamble in a case that the assignment period that is longer than the predetermined time window has expired.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A liquid crystal display device comprising:
a backlight unit that includes a light source;
a liquid crystal panel that displays an image on a front surface by transmittingblocking light from the backlight unit;
an image process unit that generates an image signal which is displayed on the liquid crystal panel; and
a liquid crystal panel drive unit that based on the image signal, generates a liquid crystal drive signal which controls switching of transmissionblocking performed by the liquid crystal panel;
the liquid crystal display device comprises a panel temperature obtaining unit that obtains a temperature of the liquid crystal panel; and
the liquid crystal display device comprises an image signal correction unit that performs a correction to cut a predetermined gradation of the image signal when the temperature of the liquid crystal panel is lower than a temperature during a steady-state operation time of the liquid crystal display device.
2. The liquid crystal display device according to claim 1, wherein
the image signal correction unit cuts a high gradation of the image signal.
3. The liquid crystal display device according to claim 1, wherein
the image signal correction unit cuts a low gradation of the image signal.
4. The liquid crystal display device according to claim 1, wherein
the image signal correction unit, in accordance with the temperature of the liquid crystal panel, determines whether to cut a high gradation, a low gradation or both gradations of the image signal.
5. The liquid crystal display device according to claim 1, wherein
the liquid crystal signal correction unit uses a bias of the gradation of the image signal as a parameter to deter mine a gradation to be cut.
6. The liquid crystal display device according to claim 1, wherein
the image signal correction unit corrects the image signal more considerably when the temperature of the liquid crystal panel is lower.
7. The liquid crystal display device according to claim 1, wherein
the image signal correction unit performs the correction of the image signal by means of a calculation process based on a calculation formula given in advance and the temperature of the liquid crystal panel.
8. The liquid crystal display device according to claim 1, further comprising a gradation correction database that includes a gradation correction table, in which a correction amount of the image signal is prepared, for every temperature of the liquid crystal panel; wherein
the image signal correction unit calls a gradation correction table corresponding to the temperature of the liquid crystal panel from the gradation correction database, refers to the gradation correction table, and corrects the image signal.
9. The liquid crystal display device according to claim 1, further comprising a control unit that when a correction is performed by the image signal correction unit to cut the high gradation of the image signal, performs control to increase brightness of the backlight unit.
10. The liquid crystal display device according to claim 1, further comprising a control unit that when a correction is performed by the image signal correction unit to cut the low gradation of the image signal, performs control to decrease brightness of the backlight unit.