Communications control system, communications control method, and mobile station and base station for use therein

A communications control system for controlling packet communications between a base station and a mobile station, said system comprising:

• a preamble signal transmitter configured to transmit a preamble signal to said base station, varying the transmission power level, in advance of transmission of packet data or a reservation signal;
• a reservation signal transmitter configured to transmit information, as the reservation signal, regarding the amount and type of subsequent packet data to said base station, in parallel with transmission processing of said packet data;
• a determiner configured to determine the transmission power level of said packet data based on the received intensity of said preamble signal or said reservation signal and said information regarding the amount and type of said packet data;
• and
• a packet data transmitter configured to obtain information regarding said determined transmission power level of said packet data and transmit said packet data based on said obtained information, wherein:
• said determiner determines the transmission power level of a first reservation signal based on the received intensity of said preamble signal, and determines the transmission power level of a subsequent reservation signal based on the received intensity of a preceding reservation signal;
• and
• said reservation signal transmitter obtains information regarding the determined transmission power level of said reservation signal and transmits said reservation signal at said transmission power level based on said obtained information.

A communications control method for controlling packet communications between a base station and a mobile station, said method comprising the steps of:

• a) transmitting a preamble signal to said base station, varying the transmission power level, in advance of transmission of packet data or a reservation signal;
• b) transmitting information regarding the amount and type of subsequent packet data as the reservation signal to said base station, in parallel with transmission processing of said packet data;
• c) determining, at said base station, the transmission power level of said packet data based on the received intensity of said preamble signal for a first amount of packet data, and based on said reservation signal and said information regarding the amount and type of said packet data for a second amount of packet data;
• and
• d) obtaining, at said mobile station, information regarding said determined transmission power level of said packet data and transmitting said packet data based on said obtained information.

A communications control method for controlling packet communications between a base station and a mobile station, said method comprising the steps of:

• a) transmitting a preamble signal to said base station, varying the transmission power level, in advance of transmission of packet data or a reservation signal;
• b) transmitting information regarding the amount and type of subsequent packet data as the reservation signal to said base station, in parallel with transmission processing of said packet data;
• c) determining, at said base station, the transmission power level of said packet data based on the received intensity of said preamble signal or said reservation signal and said information regarding the amount and type of said packet data;
• and
• d) obtaining, at said mobile station, information regarding said determined transmission power level of said packet data and transmitting said packet data based on said obtained information;
• determining, at said base station, the transmission power level of a first reservation signal based on the received intensity of said preamble signal and determining the transmission power level of a subsequent reservation signal based on the received intensity of a preceding reservation signal;
• wherein,
• in said step b), said mobile station obtains information regarding the determined transmission power level of said reservation signal and transmits said reservation signal at said transmission power level based on said obtained information.

A mobile station for transmitting and receiving packet data to and from a base station, comprising:

• a preamble signal transmitter configured to transmit a preamble signal, varying the transmission power level, in advance of transmission of packet data or a reservation signal;
• a reservation signal transmitter configured to transmit information, as the reservation signal, regarding the amount and type of subsequent packet data to said base station, in parallel with transmission processing of said packet data;
• and
• a packet data transmitter configured to obtain information regarding the transmission power level thereof determined at said base station based on a received intensity of the preamble signal for a first amount of packet data, and based on the reservation signal for a second amount of packet data, and transmit said packet data based on said obtained information.

A mobile station for transmitting and receiving packet data to and from a base station, comprising:

• a preamble signal transmitter configured to transmit a preamble signal, varying the transmission power level, in advance of transmission of packet data or a reservation signal;
• a reservation signal transmitter configured to transmit information, as the reservation signal, regarding the amount and type of subsequent packet data to said base station, in parallel with transmission processing of said packet data;
• and
• a packet data transmitter configured to obtain information regarding the transmission power level thereof determined at said base station and transmit said packet data based on said obtained information;
• said base station determines the transmission power level of a first reservation signal based on the received intensity of said preamble signal, and determines the transmission power level of a subsequent reservation signal based on the received intensity of a preceding reservation signal;
• and
• said reservation signal transmitter obtains information regarding the determined transmission power level of said reservation signal and transmits said reservation signal at said transmission power level based on said obtained information.

A base station for transmitting and receiving packet data to and from a mobile station, comprising:

• a preamble signal receiver configured to receive a preamble signal transmitted at varied transmission power levels, in advance of reception of said packet data or a reservation signal;
• a reservation signal receiver configured to receive the reservation signal including information regarding the amount and type of subsequent packet data, transmitted in parallel with transmission processing of said packet data;
• and
• a determiner configured to determine the transmission power level of said packet data based on the received intensity of said preamble signal for a first amount of packet data, and based on said reservation signal and said information regarding the amount and type of said packet data for a second amount of packet data.