Multiplex communications – Communication techniques for information carried in plural... – Transmission bandwidth conservation
Reexamination Certificate
2001-02-16
2004-10-12
Pham, Chi (Department: 2663)
Multiplex communications
Communication techniques for information carried in plural...
Transmission bandwidth conservation
C370S342000
Reexamination Certificate
active
06804260
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention generally relates to the field of wireless communications. More particularly, the present invention relates to a novel method for determining when to maintain a compression state and efficiently applying compression techniques on a wireless communication device.
2. Description of Related Art
Recent innovations in wireless communication and computer-related technologies, as well as the unprecedented growth of Internet subscribers, have paved the way for mobile computing. In fact, the popularity of mobile computing has placed greater demands on the current Internet infrastructure to provide mobile users with more support. A crucial part of meeting these demands and providing users with the necessary support is the use of Code Division Multiple Access (CDMA) technology in wireless communication systems.
CDMA is a digital radio-frequency (RF) channelization technique defined in the Telecommunications Industry Association/Electronics Industries Association Interim Standard-95 (TIA/EIA IS-95), entitled “MOBILE STATION-BASE STATION COMPATIBILITY STANDARD FOR DUAL-MODE WIDEBAND SPREAD SPECTRUM CELLULAR SYSTEM”, published in July 1993 and herein incorporated by reference. Other standards describing CDMA operations include TIA TR45.5. The CDMA2000 ITU-R RTT Candidate Submission, approved May 15, 1998 and Third Generation Partnership Project—Technical Specification Group—Radio Access Network/Radio Interface Protocol Architecture, Release 99, both of which are incorporated by reference. Wireless communication systems employing CDMA technology assign a unique code to communication signals and spread these communication signals across a common (wideband) spread spectrum bandwidth. As long as the receiving apparatus in a CDMA system has the correct code, it can successfully detect and select its communication signal from the other signals concurrently transmitted over the same bandwidth. The use of CDMA produces an increase in system traffic capacity, improves overall call quality and noise reduction, and provides a reliable transport mechanism for data service traffic.
FIG. 1
illustrates the basic elements of such a wireless data communication system
100
. Practitioners will readily appreciate that these elements, and their interfaces, may be modified, augmented, or subjected to various standards known in the art, without limiting their scope or function. System
100
allows a mobile terminal equipment, TE2 device
102
(e.g., the terminal equipment such as laptop or palmtop computer) to communicate with a gateway entity, such as an Interworking Function (IWF)
108
or a Packet Data Serving Node (PSDN). The IWF
108
serves as a gateway between the wireless network and other networks, such as the Public Switched Telephone Network (PSTN) or wireline packet data networks providing Internet- or Intranet-based access. System
100
includes a wireless communication device, MT2 device
104
(e.g., wireless telephone), and a Base Station/Mobile Switching Center (BS/MSC)
106
or Radio Access Network (RAN). Often the IWF
108
will be co-located with the BS/MSC
106
. An L interface may couple IWF
108
to BS/MSC
106
. The TE2 device
102
is electronically coupled to the MT2 device
104
via the R
m
interface. The MT2 device
104
communicates with the BS/MSC
106
via the wireless interface U
m
. The TE2 device
102
and the MT2 device
104
may be integrated into a single unit (e.g., MT0 device) or may be separated out, as in the case of an installed mobile phone unit in which a laptop is the TE2 device
102
and the transceiver is the MT2 device
104
. It is important to note that, as indicated by
FIG. 2
, the combination of the TE2 device
102
and the MT2 device
104
, whether integrated or separate, is generally referred to as a mobile station (MS)
103
.
Other support is made possible by applying various well-known protocols to control, manage, or otherwise facilitate different aspects of wireless communications. For example, the life-blood of the Internet infrastructure, the Internet Protocol (IP), has been incorporated in many wireless communication services to accommodate packet-oriented services. The IP protocol specifies the addressing and routing of packets (datagrams) between host computers and is defined in Request For Comment 791 (RFC 791) entitled, “INTERNET PROTOCOL DARPA INTERNET PROGRAM PROTOCOL SPECIFICATION,” published September 1981, and herein incorporated by reference.
The IP protocol is a network layer protocol that encapsulates data into IP packets for transmission. Addressing and routing information is affixed in the header of the packet. IP headers contain 32-bit addresses that identify the sending and receiving hosts. These addresses are used by intermediate routers to select a path through the network for the packet towards its ultimate destination at the intended address. Thus, the IP protocol allows packets originating at any Internet node in the world to be routed to any other Internet node in the world.
Another well-known protocol incorporated in wireless communications systems is the Point-to-Point Protocol (PPP) protocol, which provides, inter alia, Internet access. The PPP protocol is described in detail in Request for Comments 1661 (RFC 1661), entitled “THE POINT-TO-POINT PROTOCOL (PPP)”, published July 1994 and herein incorporated by reference.
Essentially, the PPP protocol specifies a method for transporting multi-protocol datagrams over point-to-point links and contains three main components: a method of encapsulating multi-protocol datagrams; a Link Control Protocol (LCP) for establishing, configuring, and testing a data link connection; and a family of Network Control Protocols (NCPs) for establishing and configuring different network-layer protocols.
In an effort to provide a host of services on wireless communication systems, various standards have been developed to accommodate the wireless data transmission between the TE2 device
102
and the IWF
108
. For example, the TIA/EIA IS-707.5 standard, entitled “DATA SERVICE OPTIONS FOR WIDEBAND SPREAD SPECTRUM SYSTEMS: PACKET DATA SERVICES,” published February 1998, and herein incorporated by reference, defines requirements for support of packet data transmission capability on TIA/EIA IS-95 systems and specifies a suite of packet data bearer services. Similarly, the TIA/EIA IS-707-A.5 standard, entitled “DATA SERVICE OPTIONS FOR SPREAD SPECTRUM SYSTEMS: PACKET DATA SERVICES,” and the TIA/EIA IS-707-A.9 standard, entitled “DATA SERVICE OPTIONS FOR SPREAD SPECTRUM SYSTEMS: HIGH-SPEED PACKET DATA SERVICES,” both published in March 1999 and incorporated by reference, also define requirements for packet data transmission support on TIA/EIA IS-95 systems. In addition, new standards such as TIA/EIA IS-707-A-1 and A-2, entitled “DATA SERVICE OPTIONS FOR SPREAD SPECTRUM SYSTEMS: CDMA2000 HIGH-SPEED PACKET DATA SERVICES,” (Ballot Resolution Version 1999) and incorporated by reference, also define requirements for packet data transmission support on CDMA systems.
In particular, the IS-707.5 standard provides certain packet data service modes that may be used to communicate between the TE2 device
102
and IWF
108
via BS/MSC
106
. In doing so, IS-707.5 introduces the Network Model, which details the packet data protocol requirements for the R
m
and U
m
interfaces. The network model represents the situation where a first PPP link is set up between the TE2 device
102
and the MT2 device
104
, and a second PPP link, independent of the first, is set up between the MT2 device
104
and the IWF
108
. This model makes the MT2 device
104
responsible for unframing any received PPP packets and re-framing them before forwarding them to their final destination as well as providing mobility management and network address management.
FIG. 2
illustrates the protocol stacks
200
in each entity of the IS-707.5 Network Model. At the far left of
FIG. 2
is a protocol stack, shown in conventional vertical format, depicting the protocol layers running
Abrol Nischal
Lioy Marcello
Brown Charles D.
Ferris Derrick W
Pham Chi
Qualcomm Incorporated
Thibault Thomas M.
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