Communication control device and communication control method

• US 20060056410A1
• Filed: 09/09/2005
• Published: 03/16/2006
• Est. Priority Date: 09/10/2004
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kawashima, Jun, Morimura, Kazuhiko, Morikawa, Ken-ichi
• Granted Patent: US 7,620,050 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 69/12 Protocol engines
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/161 Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
• CPC Class Codes: H04L 69/166 IP fragmentation; TCP segmentation

Abstract

A communication control device comprises a calculation part for calculating the number of frames and the frame length for transmitting the transmit data, a payload division part for dividing the transmit data into frame units based on the calculation results of the calculation part, and a header generation part for generating a header to be appended to the transmit data of frame unit based on the calculation results of the calculation part in the midst of dividing the transmit data by the payload division part. Thereby, the parallel processing ability of the hardware can be exhibited, a memory management method can be simplified, and the transmit data can be outputted as the frame at high speed.

Claims

1. A communication control apparatus comprising:

a calculation device configured to calculate the number of frames and the frame length for transmitting the transmit data;

a division device configured to divide the transmit data into frame units based on the calculation results by said calculation device; and

a header generation device configured to generate a header to be appended to the transmit data of said frame unit based on the calculation results by said calculation device in the midst of dividing the transmit data by said division device.

2. The communication control apparatus according to claim 1, wherein said calculation device calculates said number of frames and said frame length upon a data transmission request, and said header generation device generates the header to be appended to the transmit data while the transmit data is being inputted by said division device.

3. The communication control apparatus according to claim 1, wherein said division device calculates a check sum for every frame by adding the transmit data of frame unit, and said header generation device appends said check sum to said header.

4. The communication control apparatus according to claim 1, wherein said division device outputs a division completion notice of frame unit every time of inputting and dividing the transmit data of one frame, even while inputting the transmit data of plural frames, and said header generation device generates said header of frame unit upon said division completion notice of frame unit.

5. The communication control apparatus according to claim 1, wherein said header generation device outputs a header generation completion notice of frame unit every time of generating the header for each frame, even while said division device is inputting the transmit data of plural frames, and said apparatus has a synthesis device configured to synthesize the transmit data and the header of said frame unit upon said header generation completion notice of frame unit.

6. The communication control apparatus according to claim 5, further comprising a protocol control device configured to collect the header generation information required for generating the frame, and to output a header generation instruction and the header generation information for every frame, wherein said header generation device inputs said header generation instruction and said header generation information from said protocol control device and outputs a header generation completion notice by generating the header.

7. The communication control apparatus according to claim 5, further comprising a frame transmitting device configured to transmit the frame synthesized by said synthesis device.

8. The communication control apparatus according to claim 7, further comprising a memory for storing the transmit data of frame units divided by said division device.

9. The communication control apparatus according to claim 8, further comprising a reading device configured to read the transmit data of frame units from said memory and to output it to said synthesis device.

10. The communication control apparatus according to claim 5, wherein said header generation device comprises a TCP header generation device configured to generate a TCP header, a UDP header generation device configured to generate a UDP header, an IP header generation device configured to generate an IP header, and a MAC header generation device configured to generate a MAC header, and said protocol control device outputs an instruction of generating a desired header.

11. A communication control apparatus comprising:

a protocol control device configured to collect the header generation information required for generating a frame, and to output a header generation instruction and the header generation information for every frame;

a header generation device configured to generate a header for every header and to output a header generation completion notice if said header generation instruction and said header generation information are inputted from said protocol control device; and

a header/payload synthesis device configured to synthesize said generated header and payload of frame unit into the frame if said header generation completion notice is inputted from said header generation device.

12. The communication control apparatus according to claim 11, wherein said header generation device comprises a TCP header generation device configured to generate a TCP header for every one header, a UDP header generation device configured to generate a UDP header for every one header, an IP header generation device configured to generate an IP header for every one header, and a MAC header generation device configured to generate a MAC header for every one header, and said protocol control device outputs an instruction of generating a desired header.

13. The communication control apparatus according to claim 11, wherein after said header/payload synthesis device outputs a header synthesized as the previous frame, said protocol control device outputs a header generation instruction of the next frame to said header generation device.

14. The communication control apparatus according to claim 11, further comprising a memory for storing a payload of frame unit, wherein said protocol control device outputs the header generation instruction corresponding to the payload to said header generation device after the payload is written into said memory.

15. The communication control apparatus according to claim 11, further comprising a memory for storing a payload of frame unit, wherein said protocol control device outputs the header generation instruction of the next frame to said header generation device after said header/payload synthesis device outputs the header synthesized as the previous frame, and after the next payload is written into said memory.

16. The communication control apparatus according to claim 11, further comprising a frame transmitting device configured to transmit the frame synthesized by said header/payload synthesis device.

17. The communication control apparatus according to claim 16, further comprising a payload division device configured to divide the transmit data into the payloads of frame units.

18. The communication control apparatus according to claim 17, further comprising a memory for storing the payloads of frame units divided by said payload division device.

19. The communication control apparatus according to claim 18, further comprising a payload reading device configured to read the payloads of frame units from said memory and to output them to said header/payload synthesis device.

20. The communication control apparatus according to claim 19, further comprising a frame count frame length calculation device configured to calculate the number of frames and the frame length based on the length of transmit data, wherein said payload division device divides the payload based on the number of frames and the frame length that are calculated.

21. A communication control method comprising:

a calculation step of calculating the number of frames and the frame length for transmitting the transmit data;

a division step of dividing the transmit data into frame units based on the calculation results at said calculation step; and

a header generation step of generating a header to be appended to the transmit data of said frame unit based on the calculation results at said calculation step, said header generation step being started in parallel with dividing the transmit data at said division step.

22. A communication control method comprising:

a protocol control step of collecting the header generation information required for generating a frame, and outputting a header generation instruction and the header generation information for every frame;

a header generation step of generating a header for every frame and outputting a header generation completion notice if said header generation instruction and said header generation information are inputted; and

a header/payload synthesis step of synthesizing said generated header and payload of frame unit into the frame if said header generation completion notice is inputted.