US 9,814,052 B2
Data distribution system, distribution device, terminal device, and data distribution method providing enhanced communication efficiency
Hiroaki Hirai, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Chiyoda-ku (JP)
Appl. No. 14/652,522
Filed by MITSUBISHI ELECTRIC CORPORATION, Chiyoda-ku (JP)
PCT Filed Jun. 4, 2013, PCT No. PCT/JP2013/065465
§ 371(c)(1), (2) Date Jun. 16, 2015,
PCT Pub. No. WO2014/057709, PCT Pub. Date Apr. 17, 2014.
Claims priority of application No. 2013-026887 (JP), filed on Feb. 14, 2013.
Prior Publication US 2016/0021668 A1, Jan. 21, 2016
Int. Cl. H04L 1/00 (2006.01); H04W 72/06 (2009.01); H04W 4/06 (2009.01); H04W 24/08 (2009.01); H04W 84/18 (2009.01); H04W 88/04 (2009.01); H04W 40/02 (2009.01); H04L 12/733 (2013.01); H04L 12/709 (2013.01); H04L 12/721 (2013.01)
CPC H04W 72/06 (2013.01) [H04W 4/06 (2013.01); H04W 24/08 (2013.01); H04L 45/122 (2013.01); H04L 45/245 (2013.01); H04L 45/70 (2013.01); H04W 40/02 (2013.01); H04W 84/18 (2013.01); H04W 88/04 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A data distribution system comprising:
a distribution device that distributes data; and
a plurality of terminal devices that receive distribution of the data by radio communication, wherein
the distribution device includes first circuitry configured to measure a communication status with each of the terminal devices,
the terminal devices each include second circuitry configured to measure a communication status with the distribution device and a communication status with each of other terminal devices and notify the distribution device of measurement results,
the first circuitry
categorizes the terminal devices as a relay terminal that relays the data or as an end terminal that does not relay the data on a basis of the measurement results notified by the terminal devices and a communication status measured by the distribution device itself,
selects the relay terminals such that it is possible to distribute the data to all the relay terminals by relaying the data between the relay terminals and possible for the end terminal to receive the data from two or more of the distribution device and the relay terminals,
identifies at least two relay terminals, or one relay terminal and the distribution device, that are connect to the end terminal,
notifies the terminal devices of a categorization result,
selects a relay path through which it is possible to distribute the data to all the relay terminals by relaying the data between the relay terminals, and
notifies the terminal devices of the relay path, and
the second circuitry distributes, when the terminal device is notified by the distribution device that the terminal device itself is the relay terminal, the data, received from the distribution device or from the relay terminal at a previous hop, to the distribution device or the end terminal at a next hop in accordance with an instruction from the distribution device.