Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Reexamination Certificate
1999-06-22
2003-06-10
Kizou, Hassan (Department: 2662)
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
C370S235000, C370S329000
Reexamination Certificate
active
06577644
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates generally to communications and, more particularly, to packet communications systems.
(2) Background Art
CDMA (carrier division multiple access) packet data service represents one method of providing wireless data services to mobile users over Internet Protocol (IP) based networks (e.g., see Tom Hiller, “Wireless IP Network Architecture based on IETF Protocols”, TR45.6-3G/99.05.17.06). In TR 45.6, the point-to-point protocol (PPP) is used as the link layer between a mobile terminal, or mobile node (MN) and a Packet Data Serving Node (PDSN).
It has been proposed to enhance PPP to provide quality of service (QoS) features. One proposal is “real-time framing” (e.g., see C. Bormann, “PPP in a real-time oriented HDLC-like framing”, work in progress, (draft-ietf-issll-isslow-rtf-05.txt), April 1999). Another approach is “multiclass multilink PPP” “(e.g., see C. Bormann, “The Multiclass Extension to Multilink PPP”, work in progress, (draft-ietf-issll-isslow-mcml-06.txt), June 1999).
Unfortunately, both these modifications are not well-suited to wireless access networks. For example, real-time framing is not, sufficient because the PPP peers are only aware of any different classes of service when bearer traffic appears on the receiving interface. However, for a wireless access network this information is needed to decide which type of wireless link to activate—before bearer traffic appears. With respect to multiclass multilink PPP, this approach fragments each packet for transport across multiple links. In addition, multiclass multilink PPP, while specifying the maximum number of classes for a multilink PPP session, does not specify the class definitions.
SUMMARY OF THE INVENTION
Multilink PPP is enhanced to provide for a more flexible quality of service (QoS) support in a wireless environment. In particular, and in accordance with the invention, multilink PPP is enhanced to enable a packet interface, or packet endpoint, to transmit a message to an opposite PPP peer, where the message identifies the number, and type, of classes on a particular PPP link.
In an embodiment of the invention, multilink PPP is modified to support a “non-Sharing QoS Negotiation” option message, and a “QoS-Enhanced Multilink Header Format” option message during the IP control protocol (IPCP) phase.
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Chuah Mooi Choo
Hernandez-Valencia Enrique
Hoang Thai
Kizou Hassan
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