MOBILITY HEADER COMPRESSION METHOD AND SYSTEM FOR INTERNET PROTOCOL-BASED LOW POWER WIRELESS NETWORK

• US 20090185549A1
• Filed: 01/16/2009
• Published: 07/23/2009
• Est. Priority Date: 01/17/2008
• Status: Active Grant

• Current Assignee: Industry-Academic Cooperation Foundation Yonsei University, Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: SHON, Tae Shik, Choi, Hyo Hyun, Kim, Jin Ho, Kim, Sun Gi, Hong, Choong Seon
• Granted Patent: US 8,213,403 B2
• Time in Patent Office: Days
• US Class Current: 370/349
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• 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 69/22 Parsing or analysis of headers
• 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: Y02D 30/00 Reducing energy consumption in communication networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A mobility header compression method and system for an IPv6-based LoWPAN is provided for supporting IPv6 mobility to the IPv6-based LoWPAN checks a packet carrying data and a first and a second headers containing transmission information about the data to determine whether the second header contains a compressed Internet Protocol version 6 (IPv6) information. When the second header contains a compressed IPv6 information, ands followed by a mobility header, a mobility support-indicative field of the first header is set to indicate that the second header is followed by the mobility header and the rest of the fields of the second header are compressed except for the mobility header-indicative field. A mobility information-indicative field of the mobility header is set to indicate inclusion of mobility information; and the rest of the fields of the mobility header are compressed except for the mobility information-indicative field.

Claims

1. A header compression method for a wireless network, comprising:

(a) determining whether a second header contains a compressed Internet Protocol version 6 (IPv6) information in a packet comprising data and at least one header containing transmission information about the data including the second header;

(b) determining, when the second header contains a compressed IPv6 information, whether a mobility header follows the second header;

(c) setting, when the second header is followed by the mobility header, a mobility support-indicative field of the first header containing information about the second header to indicate that the first header is followed by a compressed IPv6 header with the mobility header and a mobility header-indicative field of the second header to indicate that the second header is followed by the mobility header;

(d) compressing a remainder of fields of the second header except for the mobility header-indicative field;

(e) setting a mobility information-indicative field of the mobility header to indicate inclusion of mobility information; and

(f) compressing a remainder of fields of the mobility header except for the mobility information-indicative field.

2. The header compression method of claim 1, wherein the first header comprises a Dispatch header having a length of 8 bits and being included in an IPv6 over LoWPAN (6LoWPAN) packet.

3. The header compression method of claim 2, wherein the first header in (c) is set to a predetermined bit pattern for indicating that the first header is followed by a compressed IPv6 header and mobility header.

4. The header compression method of claim 1, wherein the second header comprises a compressed IPv6 header having a length of 8 bits.

5. The header compression method of claim 4, wherein the mobility header-indicative field comprises a Next header field having a length of 2 bits.

6. The header compression method of claim 5, wherein compressing said remainder of the fields of the second header comprises:

(i) assigning one bit out of 6 bits, except for the mobility header-indicative field, for indicating whether a source prefix is compressed;

(ii) assigning a second bit out of the 6 bits for indicating whether a source interface identifier is compressed;

(iii) assigning a third bit out of the 6 bits for indicating whether a destination prefix is compressed;

(iv) assigning a fourth bit out of the rest 6 bits for indicating whether a destination interface identifier is compressed;

(v) assigning a fifth bit out of the 6 bits for indicating whether traffic class and flow label are compressed; and

(vi) assigning a sixth bit out of the six bits for indicating whether the second header is followed by an additional compressed header.

7. The header compression method of claim 1, wherein the mobility header comprises 8 bits.

8. The header compression method of claim 7, wherein the mobility information-indicative field of the mobility header comprises one bit of 8 bits, and the one bit is set to a predetermined bit pattern for indicating that the mobility header is followed by mobility information.

9. The header compression method of claim 8, wherein the mobility information comprises a binding update information.

10. The header compression method of claim 9, wherein the binding update information comprises a sequence number, a lifetime, an acknowledgement request, a home registration, a foreign network prefix, and a home address.

11. The header compression method of claim 10, wherein compressing the remainder of fields of the mobility header comprises:

(i) assigning a first bit said 8 bits, except for the 0^th bit of the 8 bits, for indicating whether the sequence number is compressed;

(ii) assigning a second bit of the 8 bits for indicating whether the lifetime is compressed;

(iii) assigning a third bit of the 8 bits for indicating whether the acknowledgement request is enabled;

(iv) assigning a fourth bit of the 8 bits for indicating whether the home registration is enabled;

(v) assigning a fifth bit of the 8 bits for indicating whether a foreign network prefix is included;

(vi) assigning a sixth bit of the 8 bits for indicating whether a home address is included; and

(vii) reserving a seventh bit of the 8 bits for future use.

12. The header compression method of claim 11, wherein the binding update information comprises:

a sequence number field containing 1-byte sequence number matched with the bit of the mobility header which indicates whether the sequence number is compressed;

a lifetime field containing 1-byte lifetime matched with the bit of the mobility header which indicates whether the life time is compressed;

a foreign network prefix field containing 16-byte foreign network prefix matched with the bit of the mobility header which indicates whether the foreign network prefix is included; and

a home address field containing 8-byte home address matched with the bit of the mobility header which indicates whether the home address is included.

13. The header compression method of claim 2, wherein the first header is set to a different predetermined bit pattern for indicating whether the first header is followed by a compressed IPv6 header or not, and whether the second header is followed by a mobility header or not.

14. The header compression method of claim 13, wherein the second header comprises a next header field which is set, when the first header is set to a predetermined bit pattern indicating that the second header is followed by an uncompressed next header, a user datagram protocol (UDP) header, an Internet control message protocol (ICMP) header, and a transmission control protocol (TCP) header.

15. A header compression method for a wireless network, comprising:

(a) receiving a binding update packet comprising data and a first header and a second header containing transmission information about the data;

(b) determining whether the second header contains a compressed Internet Protocol version 6 (IPv6) information;

(c) setting, when the second header contains a compressed IPv6 information, a first header to have a mobility support-indicative field indicating that the first header is followed by a compressed IPv6 header with a mobility header, and a second header to have a mobility header-indicative field for indicating that the second header is followed by the mobility header;

(d) compressing a remainder of fields of the second header except for the mobility header-indicative field;

(e) setting the mobility header to have a mobility information-indicative field indicating the mobility header is followed by a binding acknowledgement information; and

(f) compressing a remainder of fields of the mobility header except for the mobility information-indicative field.

16. The header compression method of claim 15, wherein the first header comprises a Dispatch header being 8 bits in length.

17. The header compression method of claim 16, wherein the first header is set to a predetermined bit pattern for indicating that the first header is followed by the compressed IPv6 header and mobility header.

18. The header compression method of claim 15, wherein the second header comprises 8 bits in length.

19. The header compression method of claim 18, wherein the mobility header-indicative field comprising a next header field composed of two bits of the second header and is set to a predetermined bit pattern indicating that the second header is followed by the mobility header.

20. The header compression method of claim 15, wherein the mobility header is 8 bits long, and the mobility information-indicative field is one bit of the mobility header and set to a predetermined bit pattern for indicating that the mobility header is followed by a mobility information.

21. The header compression method of claim 20, wherein the mobility information comprises binding information carried by an acknowledgement header including a 1 byte sequence number field and 1 byte life time field.

22. The header compression method of claim 21, wherein the acknowledgement header comprises a binding acknowledgement header.

23. A header compression system for a wireless network, comprising:

a plurality of mobile nodes, each node checking a packet carrying a data and a first and a second headers containing transmission information on the data, and means for determining whether the second header contains a compressed Internet Protocol version 6 (IPv6) information, and means for determining when the second header contains a compressed IPv6 information, and means for determining whether the second header is followed by a mobility header;

means for setting, when the second header is followed by a mobility header, a mobility support-indicative field of the first header to indicate that the second header is followed by the mobility header; and

for setting a mobility header-indicative field of the second header to indicate that the second header is followed by the mobility header; and

means for compressing a remainder of fields of the second header except for the mobility header-indicative field; and

means for setting a mobility information-indicative field of the mobility header to indicate inclusion of mobility information; and

for compressing a remainder of fields of the mobility header except for the mobility information-indicative field.