ON-BOARD WIRELESS COMMUNICATION APPARATUS AND ON-BOARD WIRELESS COMMUNICATION SYSTEM

• US 20120127947A1
• Filed: 10/13/2009
• Published: 05/24/2012
• Est. Priority Date: 10/13/2009
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Usui, Tsutomu
• Granted Patent: US 8,817,727 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 40/20 based on geographic position or location
• CPC Class Codes: H04W 64/006 with additional information processing, e.g. for direction or speed determination
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

An on-board wireless communication apparatus using an OFDMA scheme includes: a position information acquisition unit which estimates a position after a predetermined time period based on base station position information, mobile station position information, and speed information of mobile station as estimated mobile station position information; a transmission path information storage unit which determines a transmission rate to be applied based on the estimated position information and a distribution of the transmission rate determined by a distance from the base station; a reception buffer unit which stores received data; a reception buffer amount adjustment unit which determines a data amount to be received based on a data storage amount from the buffer unit and a type of the data therein; and a band allocation unit which determines a band requested to the base station by the transmission rate from the storage unit and the data amount from the adjustment unit.

Claims

1. An on-board wireless communication apparatus for performing wireless communication using an OFDMA scheme, comprising:

a position information acquisition unit which estimates a position after a predetermined time period based on base station position information indicating a position of a base station, mobile station position information indicating a present position of the mobile station, and speed information indicating a moving speed of the mobile station, and outputs the resultant as estimated mobile station position information;

a transmission path information storage unit which determines a transmission rate to be applied based on the estimated mobile station position information from the position information acquisition unit and a distribution of the transmission rate determined by a distance from the base station;

a reception buffer unit which stores received data;

a reception buffer amount adjustment unit which determines a data amount which needs to be received on the basis of a data storage amount sent from the reception buffer unit and a type of the data stored in the reception buffer unit; and

a band allocation unit which determines a band to be requested to the base station based on the transmission rate sent from the transmission path information storage unit and the data amount sent from the reception buffer amount adjustment unit.

2. The on-board wireless communication apparatus according to claim 1, further comprising:

a vehicle information input unit which inputs route setting information indicating a route to a destination,

wherein the position information acquisition unit estimates the position after the predetermined time period on the basis of the base station position information indicating the position of the base station, the mobile station position information indicating the present position of the mobile station, the speed information indicating the moving speed of the mobile station, and the route setting information inputted from the vehicle information input unit, and outputs the resultant as the estimated mobile station position information.

3. The on-board wireless communication apparatus according to claim 1, further comprising:

a vehicle information input unit which inputs traffic jam information,

wherein the position information acquisition unit estimates the position after the predetermined time period on the basis of the base station position information indicating the position of the base station, the mobile station position information indicating the present position of the mobile station, the speed information indicating the moving speed of the mobile station, and the traffic jam information inputted from the vehicle information input unit, and outputs the resultant as the estimated mobile station position information.

4. The on-board wireless communication apparatus according to claim 1, further comprising:

a vehicle information input unit which inputs at least one of steering angle information from a steering, angular velocity information from a gyro, and azimuth information from a geomagnetic sensor,

wherein the position information acquisition unit estimates the position after the predetermined time period on the basis of the base station position information indicating the position of the base station, the mobile station position information indicating the present position of the mobile station, the speed information indicating the moving speed of the mobile station, and at least one of the steering angle information which are inputted from the vehicle information input unit, the angular velocity information from the gyro, and the azimuth information from the geomagnetic sensor, and outputs the resultant as the estimated mobile station position information.

5. The on-board wireless communication apparatus according to claim 1, further comprising:

a vehicle information input unit which inputs a rainfall or snowfall,

wherein the transmission path information storage unit determines the transmission rate to be applied based on the estimated mobile station position information from the position information acquisition unit, the distribution of the transmission rate determined by the distance from the base station, and the rainfall or snowfall inputted from the vehicle information input unit.

6. The on-board wireless communication apparatus according to claim 1, wherein the transmission path information storage unit downloads the distribution of the transmission rate from the base station.

7. An on-board wireless communication system for performing wireless communication between a base station and an on-board wireless communication apparatus using an OFDMA scheme,

wherein the on-board wireless communication apparatus comprises:

a position information acquisition unit which estimates a position after a predetermined time period based on base station position information indicating a position of the base station, mobile station position information indicating a present position of the mobile station, and speed information indicating a moving speed of the mobile station, and outputs the resultant as estimated mobile station position information;

a transmission path information storage unit which determines a transmission rate to be applied based on the estimated mobile station position information from the position information acquisition unit and a distribution of the transmission rate determined by a distance from the base station;

a reception buffer unit which stores received data;

a reception buffer amount adjustment unit which determines a data amount which needs to be received on the basis of a data storage amount sent from the reception buffer unit and a type of the data stored in the reception buffer unit; and

a band allocation unit which determines a band to be requested to the base station based on the transmission rate sent from the transmission path information storage unit and the data amount sent from the reception buffer amount adjustment unit.