Communication device, communication system, communication method and program

A communication device comprising:

• a receiving device that receives an information packet transmitted from a base station;
• a receiving device that receives a parity packet multicast by other terminals and identification information of all source packets via a local network;
• a memory that stores the received parity packet and the identification information of all source packets in a storage unit;
• and
• a recovery device that recovers a lost packet using the parity packet, a coding vector, and the identification information of all source packets.

A communication device comprising:

• a receiving device that receives an information packet transmitted from a base station;
• a communication device that connects to a local network for sharing information among a plurality of terminals;
• a generating device that generates a parity packet;
• a multicasting device that broadcasts the generated parity packet and identification information of all source packets to the local network;
• a receiving device that receives the parity packet multicast by other terminals and the identification information of all source packets via the local network;
• a memory that stores the received parity packet and the identification information of all source packets in a storage unit;
• and
• a recovery device that recovers a lost packet using the parity packet, a coding vector, and the identification information of all source packets.

A communication system comprising:

• a plurality of terminals that receives an information packet multicast or broadcast from a base station;
• and
• a network for sharing information among the plurality of terminals, wherein
• the plurality of terminals shares a parity packet by mutually transmitting and receiving the parity packet a plurality of times so that an information packet which could not have been received correctly by respective terminals is recovered using a coding vector;
• wherein
• one or a plurality of terminals of the plurality of terminals is a first communication device that generates and transmits a parity packet only and the other terminals are second communication devices,
• the first communication device includes:
• a receiving device that receives an information packet transmitted from a base station;
• a communication device that connects to a local network for sharing information among a plurality of terminals;
• a generating device that generates the parity packet;
• and
• a multicasting device that broadcasts the generated parity packet, a coding vector, and identification information of all source packets to the local network, and
• the second communication device includes:
• a receiving device that receives an information packet transmitted from the base station;
• a receiving device that receives the parity packet multicast by the first communication device and identification information of all source packets via the local network;
• a memory that stores the received parity packet and the identification information of all source packets in a storage unit;
• and
• a recovery device that recovers a lost packet using the parity packet, a coding vector, and the identification information of all source packets.

A communication method comprising:

• allowing a plurality of terminals to receive an information packet multicast or broadcast from a base station so that information is shared among the plurality of terminals via a network;
• and
• allowing the plurality of terminals to share a parity packet by mutually transmitting and receiving the parity packet a plurality of times so that an information packet which could not have been received correctly by respective terminals is recovered using a coding vector;
• wherein
• one or a plurality of terminals of the plurality of terminals is a first communication device that generates and transmits a parity packet only and the other terminals are second communication devices,
• the first communication device includes:
• a receiving device that receives an information packet transmitted from a base station;
• a communication device that connects to a local network for sharing information among a plurality of terminals;
• a generating device that generates the parity packet;
• and
• a multicasting device that broadcasts the generated parity packet, a coding vector, and identification information of all source packets to the local network, and
• the second communication device includes:
• a receiving device that receives an information packet transmitted from the base station;
• a receiving device that receives the parity packet multicast by the first communication device and identification information of all source packets via the local network;
• a memory that stores the received parity packet and the identification information of all source packets in a storage unit;
• and
• a recovery device that recovers a lost packet using the parity packet, a coding vector, and the identification information of all source packets.

A non-transitory computer readable storage medium having computer readable instructions stored thereon, that, when executed by a computer, cause the computer to execute a communication method comprising:

• receiving an information packet transmitted from a base station;
• connecting to a local network for sharing information among a plurality of terminals;
• generating a parity packet;
• multicasting the generated parity packet and identification information of all source packets to the local network;
• receiving the parity packet multicast by other terminals and the identification information of all source packets via the local network;
• storing the received parity packet and the identification information of all source packets in a storage unit;
• and
• recovering a lost packet using the parity packet, a coding vector, and the identification information of all source packets.