Transmitting/receiving apparatus, method, program, recoding medium, and integrated circuit used in communication network

• US 20040228273A1
• Filed: 05/13/2004
• Published: 11/18/2004
• Est. Priority Date: 05/16/2003
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kurobe, Akio, Ikeda, Koji, Yoshizawa, Kensuke, Kuroda, Gou
• Granted Patent: US 7,158,473 B2
• Time in Patent Office: Days
• US Class Current: 370/229
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: H04L 27/0004 using wavelets
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 49/3072 Packet splitting
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

A transmitting/receiving apparatus 100 includes a packet construction section 9 for dividing continuous data into a plurality of subpackets, and constructing a packet by concatenating the plurality of subpackets; a modulation transmission section 1,2,3 for modulating the constructed packet, and transmitting the modulated packet to another apparatus; a training session execution section 1, S115 for checking channel conditions, when a predetermined condition is satisfied, and changing a modulation rule; and a subpacket transmission confirmation section 1, S110 for confirming whether or not a subpacket included in the transmitted packet is transmitted successfully to the transmission destination apparatus. If the modulation rule is changed by the training session execution section, the packet construction section reconstructs a new packet by concatenating a subpacket, which is confirmed as an unsuccessfully-transmitted subpacket, with subpackets newly generated from the continuous data, and the modulation transmission section modulates the reconstructed new packet, and transmits the modulated packet.

Claims

1. A transmitting/receiving apparatus for packetizing input continuous data and transmitting the packetized data to another apparatus on a communication network, and receiving a packet transmitted from another apparatus, comprising:

a packet construction section for dividing the continuous data into a plurality of subpackets, and constructing a packet by concatenating the plurality of subpackets;

a modulation transmission section for modulating the packet constructed by the packet construction section, and transmitting the modulated packet to another apparatus on the communication network;

a training session execution section for checking channel conditions, when a predetermined condition is satisfied, by communicating with another apparatus, and changing a modulation rule used in the modulation transmission section so that a packet transmitted from the modulation transmission section is successfully transmitted to a transmission destination apparatus; and

a subpacket transmission confirmation section for confirming whether or not a subpacket included in the transmitted packet is transmitted successfully to the transmission destination apparatus, wherein

if the modulation rule is changed by the training session execution section;

the packet construction section reconstructs a new packet by concatenating a subpacket, which is confirmed as an unsuccessfully-transmitted subpacket by the subpacket transmission confirmation section, with subpackets newly generated from the continuous data, and

the modulation transmission section modulates the reconstructed new packet in accordance with the changed modulation rule, and transmits the modulated packet.

2. The transmitting/receiving apparatus according to claim 1, wherein if the subpacket transmission confirmation section confirms that at least one subpacket included in the transmitted packet is not transmitted successfully to the transmission destination apparatus,

the packet construction section reconstructs a new packet by concatenating the at least one subpacket, which is confirmed by the subpacket transmission confirmation section as an unsuccessfully-transmitted subpacket, with subpackets newly generated from the continuous data, and

the modulation transmission section modulates the reconstructed new packet, and transmits the modulated packet.

3. The transmitting/receiving apparatus according to claim 1, wherein the predetermined condition is satisfied when a number of packet retransmission performed by the modulation transmission section exceeds a predetermined upper limit.

4. The transmitting/receiving apparatus according to claim 1, wherein the predetermined condition is satisfied when a predetermined training cycle has elapsed.

5. The transmitting/receiving apparatus according to claim 1, further comprising a prebuffer for storing the continuous data to be input during an execution of a training session which is performed by the training session execution section for changing a modulation rule used in the modulation transmission section.

6. The transmitting/receiving apparatus according to claim 5, further comprising a wider bandwidth request section for requesting, when an amount of the continuous data stored in the prebuffer exceeds a predetermined threshold value, a management device, which manages a bandwidth assigned to a channel, to widen an assigned bandwidth.

7. The transmitting/receiving apparatus according to claim 6, wherein

the management device assigns a bandwidth to each apparatus on the communication network in accordance with a reservation made by each apparatus, and

the wider bandwidth request section makes a reservation with the management device so as to set a bandwidth faster than an input speed of the continuous data.

8. The transmitting/receiving apparatus according to claim 5, wherein if an amount of the continuous data stored in the prebuffer exceeds a predetermined threshold value, the transmitting/receiving apparatus sets a higher priority level to a packet, thereby transmitting the packet preferentially.

9. The transmitting/receiving apparatus according to claim 1, further comprising a postbuffer for storing data transmitted from another apparatus, wherein

reading of the data stored in the postbuffer is disabled if an amount of stored data is smaller or equal to a predetermined threshold value,

reading of the data stored in the postbuffer is enabled when the amount of stored data exceeds the predetermined threshold value, and

the data stored in the postbuffer is read, irrespective of the amount of stored data, during an execution of a training session which is performed by the training session execution section for changing a modulation rule used in the modulation transmission section.

10. A method performed by a transmitting/receiving apparatus for packetizing input continuous data and transmitting the packetized data to another apparatus on a communication network, the transmitting/receiving apparatus performing the steps of:

dividing the continuous data into a plurality of subpackets, and constructing a packet by concatenating the plurality of subpackets;

modulating the constructed packet, and transmitting the modulated packet to another apparatus on the communication network;

checking channel conditions, when a predetermined condition is satisfied, by communicating with another apparatus, and executing a training session to change a modulation rule so that a packet to be transmitted is transmitted successfully to a transmission destination apparatus;

confirming whether or not a subpacket included in the transmitted packet is transmitted successfully to the transmission destination apparatus;

reconstructing a new packet, if the modulation rule is changed by an execution of the training session, by concatenating a subpacket, which is confirmed as an unsuccessfully-transmitted subpacket, with subpackets newly generated from the continuous data; and

modulating the reconstructed new packet in accordance with the changed modulation rule, and transmitting the modulated packet.

11. A program causing a computer device to packetize input continuous data and transmit the packetized data to another apparatus on a communication network, the program causing the computer device to perform the steps of:

dividing the continuous data into a plurality of subpackets, and constructing a packet by concatenating the plurality of subpackets;

modulating the constructed packet, and transmitting the modulated packet to another apparatus on the communication network;

checking channel conditions, when a predetermined condition is satisfied, by communicating with another apparatus, and executing a training session to change a modulation rule so that a packet to be transmitted is transmitted successfully to a transmission destination apparatus;

confirming whether or not a subpacket included in the transmitted packet is transmitted successfully to the transmission destination apparatus;

reconstructing a new packet, if the modulation rule is changed by an execution of the training session, by concatenating a subpacket, which is confirmed as an unsuccessfully-transmitted subpacket, with subpackets newly generated from the continuous data; and

modulating the reconstructed new packet in accordance with the changed modulation rule, and transmitting the modulated packet.

12. A computer readable storing medium which stores a program causing a computer device to packetize input continuous data and transmit the packetized data to another apparatus on a communication network,

wherein the program causes the computer device to perform the steps of:

dividing the continuous data into a plurality of subpackets, and constructing a packet by concatenating the plurality of subpackets;

modulating the constructed packet, and transmitting the modulated packet to another apparatus on the communication network;

checking channel conditions, when a predetermined condition is satisfied, by communicating with another apparatus, and executing a training session to change a modulation rule so that a packet to be transmitted is transmitted successfully to a transmission destination apparatus;

confirming whether or not a subpacket included in the transmitted packet is transmitted successfully to the transmission destination apparatus;

reconstructing a new packet, if the modulation rule is changed by an execution of the training session, by concatenating a subpacket, which is confirmed as an unsuccessfully-transmitted subpacket, with subpackets newly generated from the continuous data; and

modulating the reconstructed new packet in accordance with the changed modulation rule, and transmitting the modulated packet.

13. An integrated circuit for packetizing input continuous data and transmitting the packetized data to another apparatus on a communication network, and receiving a packet transmitted from another apparatus, comprising:

a packet construction section for dividing the continuous data into a plurality of subpackets, and constructing a packet by concatenating the plurality of subpackets;

a modulation transmission section for modulating the packet constructed by the packet construction section, and transmitting the modulated packet to another apparatus on the communication network;

a training session execution section for checking channel conditions, when a predetermined condition is satisfied, by communicating with another apparatus, and changing a modulation rule used in the modulation transmission section so that a packet transmitted from the modulation transmission section is transmitted successfully to a transmission destination apparatus; and

a subpacket transmission confirmation section for confirming whether or not a subpacket included in the transmitted packet is transmitted successfully to the transmission destination apparatus, wherein

if the modulation rule is changed by the training session execution section;

the packet construction section reconstructs a new packet by concatenating a subpacket, which is confirmed as an unsuccessfully-transmitted subpacket by the subpacket transmission confirmation section, with subpackets newly generated from the continuous data, and

the modulation transmission section modulates the reconstructed new packet in accordance with the changed modulation rule, and transmits the modulated packet.