Packet compression system, packet restoration system, packet compression method, and packet restoration method

• US 20040090989A1
• Filed: 11/06/2003
• Published: 05/13/2004
• Est. Priority Date: 11/08/2002
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Infrontia Corporation (NEC Corporation)
• Inventors: Kobayashi, Yoshikazu
• Granted Patent: US 7,397,819 B2
• Time in Patent Office: Days
• US Class Current: 370/469
• CPC Class Codes: H03M 7/30 Compression speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• 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
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A packet compression system of this invention includes: a reception unit for receiving at least one uncompressed packet, the uncompressed packet including a header and a payload of a second OSI layer, the payload of the second OSI layer including a header and a payload of a third OSI layer, the payload of the third OSI layer including a header and a payload of a fourth OSI layer, the payload of the fourth OSI layer including a codec signal; a compression unit for generating a compressed packet in which at least one the codec signal is inserted into the payload of the second layer without interposition of the third OSI layer and the fourth OSI layer by deleting the header of the third OSI layer and the header of the fourth OSI layer from the uncompressed packet; and a transmission unit for transmitting the compressed packet.

Claims

1. A packet compression system comprising:

reception means for receiving at least one uncompressed packet, the uncompressed packet including a header and a payload of a second OSI layer, the payload of said second OSI layer including a header and a payload of a third OSI layer, the payload of said third OSI layer including a header and a payload of a fourth OSI layer, the payload of said fourth OSI layer including a codec signal;

compression means for generating a compressed packet in which at least one said codec signal is inserted into the payload of said second layer without interposition of said third OSI layer and said fourth OSI layer by deleting the header of said third OSI layer and the header of said fourth OSI layer from said uncompressed packet; and

transmission means for transmitting said compressed packet.

2. The packet compression system according to claim 1, further comprising:

detection means for detecting the uncompressed packet in which the codec signal is inserted into the payload of the fourth OSI layer, wherein

said compression means generates said compressed packet based on the uncompressed packet of which said detection means detects that the codec signal is inserted into the payload of said fourth OSI layer.

3. The packet compression system according to claim 2, wherein

said detection means detects the uncompressed packet of which the codec signal is inserted into the payload of said fourth OSI layer at least based on a content of the header of the third OSI layer of the uncompressed packet and a content of the header of the fourth OSI layer of the uncompressed packet.

4. The packet compression system according to claim 1, further comprising:

notification reception means for receiving a notification of specific information on the uncompressed packet that should be transformed to the compressed packet, from a device comprising a packet restoration system, wherein

said compression means generates said compressed packet based on the uncompressed packet of which the notification is received from the device comprising said packet restoration system.

5. The packet compression system according to claim 1, further comprising:

insertion means for inserting an IP address of a device comprising a packet restoration system into the payload of the second OSI layer of said compressed packet.

6. The packet compression system according to claim 1, wherein

said compression means further deletes a fixed part of a header of the codec signal.

7. The packet compression system according to claim 1, wherein

said reception means receives a plurality of uncompressed packets, each of which is addressed to each of a plurality of network terminals,

said compression means generates the compressed packet in which at lest two said codec signals are inserted into the payload of said second OSI layer without interposition of said third OSI layer and said fourth OSI layer, and

said transmission means transmits said compressed packet to the plurality of network terminals.

8. The packet compression system according to claim 1, wherein

said compression means makes the header of said second OSI layer of said compressed packet differ from the header of said second OSI layer of said uncompressed packet.

9. The packet compression system according to claim 8, further comprising:

means for detecting a cycle of said codec signal, wherein

information on the detected cycle is inserted into a header other than the header of said second OSI layer of said uncompressed packet.

10. The packet compression system according to claim 1, wherein

said compression means extracts information varying for every uncompressed packet, the extracted information having been included in the header of said third OSI layer of said uncompressed packet, and inserts the extracted information into the payload of said second OSI layer of said compressed packet without interposition of said third OSI layer and said fourth OSI layer.

11. The packet compression system according to claim 1, wherein

the packet compression system is provided in each of a plurality of terminals, and

the packet compression system further comprises adjustment means for adjusting a timing for transmitting said compressed packet between the terminals.

12. The packet compression system according to claim 11, wherein

said adjustment means adjusts the timing for transmitting said compressed packet between the terminals based on a synchronization signal transmitted to each of the terminals and a slot number allocated to each of the terminal.

13. The packet compression system according to claim 1, wherein

said compression means inserts codec signals having different cycles into said compressed packet, inserts cycle information for each of the cycles, and integrates said cycle information and the codec signals for each of the cycles.

14. The packet compression system according to claim 1, wherein

said compression means inserts cycle information indicating a cycle of said codec signal into the payload of said second OSI layer of said compressed packet.

15. The packet compression system according to claim 1, wherein

said compression means adjusts the number of codec signals inserted into the payload of said second OSI layer of said compressed packet so that the number of said compressed packets transmitted from said transmission means per unit time does not exceed a predetermined value irrespectively of the number of said uncompressed packets received by said reception means per unit time.

16. The packet compression system according to claim 1, further comprising:

control means for controlling one of a codec section and a VoIP section provided on an uncompressed packet transmission side to decrease a communication volume of said codec signal when the number of said compressed packets transmitted per unit time reaches a predetermined limit thereof and the number of codec signals included in each of the compressed packets reaches a predetermined limit thereof.

17. The packet compression system according to claim 1, wherein

said compression means inserts a call control signal into the payload of said second OSI layer of said compressed packet without interposition of said third OSI layer and said fourth OSI layer.

18. The packet compression system according to claim 1, further comprising:

means for calculating a transmission cycle of said compressed packet based on a reception cycle of said uncompressed packet.

19. The packet compression system according to claim 1, further comprising:

means for making a QoS of said compressed packet correspond to a QoS of said uncompressed packet.

20. A packet compression system comprising:

reception means for receiving an uncompressed packet, the uncompressed packet including a header and a payload of a second OSI layer, the payload of said second OSI layer including an MAC address-base VLAN packet;

compression means for generating a compressed packet in which at least one said MAC address-base VLAN packet excluding a VLAN tag is inserted into the payload of said second OSI layer by deleting the VLAN tag from said uncompressed packet; and

transmission means for transmitting said compressed packet.

21. A packet restoration system comprising:

reception means for receiving a compressed packet in which a codec signal is inserted into a payload of a second OSI layer without interposition of a third OSI layer and a fourth OSI layer;

header insertion means for inserting a header of the third OSI layer and a header of the fourth OSI layer into the payload of the second OSI layer of said received compressed packet so as to include said codec signal in a payload of said fourth OSI layer.

22. The packet restoration system according to claim 21, further comprising:

transmission means for transmitting a compressed packet in which said codec signal is included in the payload of said fourth OSI layer.

23. The packet restoration system according to claim 21, further comprising:

detection means for detecting an uncompressed packet in which the codec signal is included in the payload of said fourth OSI layer, and

request transmission means for transmitting a request of compressing the uncompressed packet of which the codec signal is inserted into the payload of said fourth OSI layer to a device comprising a packet compression system if the detection means detects the uncompressed packet.

24. The packet restoration system according to claim 23, wherein

said detection means detects the uncompressed packet in which the codec signal is inserted into the payload of said fourth OSI layer at least based on a content of the header of the third OSI layer of the uncompressed packet and a content of the header of the fourth OSI layer of the uncompressed packet.

25. The packet restoration system according to claim 21, further comprising:

storage means for storing the header of said third OSI layer and the header of said fourth OSI layer of the uncompressed packet before said reception means receives said compressed packet, said uncompressed packet including a header and the payload of said second OSI layer, the payload of said second OSI layer including the header and a payload of said third OSI layer, the payload of said third OSI layer including the header and the payload of said fourth OSI layer, the payload of said fourth OSI layer including said codec signal, wherein

said header insertion means inserts the header of the third OSI layer and the header of the fourth OSI layer stored in said storage means, into the payload of the second OSI layer of said received uncompressed packet.

26. A packet compression method comprising:

a reception step of receiving at least one uncompressed packet, the uncompressed packet including a header and a payload of a second OSI layer, the payload of said second OSI layer including a header and a payload of a third OSI layer, the payload of said third OSI layer including a header and a payload of a fourth OSI layer, the payload of said fourth OSI layer including a codec signal;

a compression step of generating a compressed packet in which at least one said codec signal is inserted into the payload of said second layer without interposition of said third OSI layer and said fourth OSI layer by deleting the header of said third OSI layer and the header of said fourth OSI layer from said uncompressed packet; and

a transmission step of transmitting said compressed packet.

27. The packet compression method according to claim 26, further comprising:

a detection step of detecting the uncompressed packet of which the codec signal is inserted into the payload of the fourth OSI layer, wherein

in said compression step, said compressed packet is generated based on the uncompressed packet for which said detection means detects that the codec signal is inserted into the payload of said fourth OSI layer.

28. The packet compression method according to claim 26, wherein in said detection step, the uncompressed packet of which the codec signal is inserted into the payload of said fourth OSI layer is detected at least based on a content of the header of the third OSI layer of the uncompressed packet and a content of the header of the fourth OSI layer of the uncompressed packet.

29. The packet compression method according to claim 26, further comprising:

a notification reception step of receiving a notification of specific information on the uncompressed packet that should be transformed to the compressed packet, from a device comprising a packet restoration system, wherein

in said compression step, said compressed packet is generated based on the uncompressed packet of which the notification is received from the device comprising said packet restoration system.

30. The packet compression method according to claim 26, further comprising:

an insertion step of inserting an IP address of a device comprising a packet restoration system into the payload of the second OSI layer of said compressed packet.

31. The packet compression method according to claim 26, wherein

in said compression step, a fixed part of a header of the codec signal is further deleted.

32. The packet compression method according to claim 26, wherein

in said reception step, a plurality of uncompressed packets, each of which is addressed to each of a plurality of network terminals are received,

in said compression step, the compressed packet in which at lest two said codec signals are inserted into the payload of said second OSI layer without interposition of said third OSI layer and said fourth OSI layer is generated, and

in said transmission step, said compressed packet is broadcast or multicast to the plurality of network terminals.

33. The packet compression method according to claim 26, wherein

in said compression step, the header of said second OSI layer of said compressed packet is made different from the header of said second OSI layer of said uncompressed packet.

34. The packet compression method according to claim 33, further comprising:

a step of detecting a cycle of said codec signal, wherein

information on the detected cycle is inserted into a header other than the header of said second OSI layer of said uncompressed packet.

35. The packet compression method according to claim 26, wherein

in said compression step, information varying for every uncompressed packets is extracted, the extracted information having been included in the header of said third OSI layer of said uncompressed packet, and inserts the extracted information into the payload of said second OSI layer of said compressed packet without interposition of said third OSI layer and said fourth OSI layer.

36. The packet compression method according to claim 26, wherein

the packet compression method is executed by each of a plurality of terminals, and

the packet compression method further comprises an adjustment step of adjusting a timing for transmitting said compressed packet between the terminals.

37. The packet compression method according to claim 36, wherein

in said adjustment step, the timing for transmitting said compressed packet between the terminals is adjusted based on a synchronization signal transmitted to each of the terminals and a slot number allocated to each of the terminal.

38. The packet compression method according to claim 26, wherein

in said compression step, codec signals having different cycles are inserted into said compressed packet.

39. The packet compression method according to claim 26, wherein

in said compression step, cycle information indicating a cycle of said codec signal is inserted into the payload of said second OSI layer of said compressed packet.

40. The packet compression method according to claim 26, wherein

in said compression step, the number of codec signals inserted into the payload of said second OSI layer of said compressed packet is changed with passage of time so that the number of said compressed packets transmitted per unit time in said transmission step does not exceed a predetermined value irrespectively of the number of said uncompressed packets received per unit time in said reception step.

41. The packet compression method according to claim 26, further comprising:

a control step of controlling one of a codec section and a VoIP section provided on an uncompressed packet transmission side to decrease a communication volume of said codec signal when the number of said compressed packets transmitted per unit time reaches a predetermined limit thereof and the number of codec signals included in each of the compressed packets reaches a predetermined limit thereof.

42. The packet compression method according to claim 26, wherein

in said compression step, a call control signal is inserted into the payload of said second OSI layer of said compressed packet without interposition of said third OSI layer and said fourth OSI layer.

43. The packet compression method according to claim 26, further comprising:

a step of calculating a transmission cycle of said compressed packet based on a reception cycle of said uncompressed packet.

44. The packet compression method according to claim 26, further comprising:

a step of making a QoS of said compressed packet correspond to a QoS of said uncompressed packet.

45. A packet compression method comprising:

a reception step of receiving an uncompressed packet, the uncompressed packet including a header and a payload of a second OSI layer, the payload of said second OSI layer including an MAC address-base VLAN packet;

a compression step of generating a compressed packet in which at least one said MAC address-base VLAN packet excluding a VLAN tag is inserted into the payload of said second OSI layer by deleting the VLAN tag from said uncompressed packet; and

a transmission step of transmitting said compressed packet.

46. A packet restoration method comprising:

a reception step of receiving a compressed packet in which a codec signal is inserted into a payload of a second OSI layer without interposition of a third OSI layer and a fourth OSI layer;

a header insertion step of inserting a header of the third OSI layer and a header of the fourth OSI layer into the payload of the second OSI layer of said received compressed packet so as to include said codec signal in a payload of said fourth OSI layer.

47. The packet restoration method according to claim 46, further comprising:

a transmission step of transmitting a compressed packet in which said codec signal is included in the payload of said fourth OSI layer.

48. The packet restoration method according to claim 46, further comprising:

a detection step of detecting an uncompressed packet in which the codec signal is included in the payload of said fourth OSI layer, and

a request transmission step of transmitting a request of compressing the uncompressed packet of which the codec signal is inserted into the payload of said fourth OSI layer to a device comprising a packet compression system if the detection means detects the uncompressed packet.

49. The packet restoration system according to claim 48, wherein

in said detection step, the uncompressed packet in which the codec signal is inserted into the payload of said fourth OSI layer is detected at least based on a content of the header of the third OSI layer of the uncompressed packet and a content of the header of the fourth OSI layer of the uncompressed packet.

50. The packet restoration system according to claim 46, further comprising:

a storage step of storing the header of said third OSI layer and the header of said fourth OSI layer of the uncompressed packet before said compressed packet is received in said reception step, said uncompressed packet including a header and the payload of said second OSI layer, the payload of said second OSI layer including the header and a payload of said third OSI layer, the payload of said third OSI layer including the header and the payload of said fourth OSI layer, the payload of said fourth OSI layer including said codec signal, wherein

in said header insertion step, the header of the third OSI layer and the header of the fourth OSI layer stored in said storage means are inserted into the payload of the second OSI layer of said received uncompressed packet.