Telecommunications – Radiotelephone system – Including personal numbering system
Reexamination Certificate
2000-01-14
2004-08-10
Chin, Vivian (Department: 2682)
Telecommunications
Radiotelephone system
Including personal numbering system
C455S551000, C455S435100, C370S349000, C370S474000
Reexamination Certificate
active
06775553
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 of avoiding time-outs to sustain IPCP address negotiations.
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. Wireless communication systems employing this 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
. Artisans of ordinary skill 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, TE
2
device
102
(e.g., the terminal equipment such as laptop or palmtop computer) to communicate with an Interworking Function (IWF)
108
. System
100
includes a wireless communication device, MT
2
device
104
(e.g., wireless telephone), and a Base Station/Mobile Switching Center (BS/MSC)
106
. The IWF
108
serves as a gateway between the wireless network and other networks, such as the Public Switched Telephone Network or wireline packet data networks providing Internet-or Intranet-based access. An L interface couples IWF
108
to BS/MSC
106
. Often the IWF
108
will be co-located with the BS/MSC
106
. The TE
2
device
102
is electronically coupled to the MT
2
device
104
via the Rm interface. The MT
2
device
104
communicates with the BS/MSC
106
via the wireless interface U
m
. The TE
2
device
102
and the MT
2
device
104
may be integrated into a single unit (e.g., MT
0
device) or may be separated out, as in the case of an installed mobile phone unit in which a laptop is the TE
2
device
102
and the transceiver is the MT
2
device
104
. It is important to note that, as indicated by
FIG. 2
, the combination of the TE
2
device
102
and the MT
2
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.
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.
Essentially, the PPP protocol specifies a method for transporting multiprotocol 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 TE
2
device
102
and the IWF
108
. For example, the TIA/EIA IS707.5 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 IS95 systems and specifies a suite of packet data bearer services.
In particular, the IS-707.5 standard provides certain packet data service modes that may be used to communicate between the TE
2
device
102
and IWF
108
via BS/MSC
106
. In doing so, IS-707.5 introduces the Network Model, which provides a specific mode of operation. The Network Model represents the situation where a first PPP link is set up between the TE
2
device
102
and the MT
2
device
104
, and a second PPP link, independent of the first, is set up between the MT
2
device
104
and the IWF
108
. This model makes the MT
2
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 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 on the TE
2
device
102
(e.g., the mobile terminal, laptop or palmtop computer). The TE
2
protocol stack is illustrated as being logically connected to the MT
2
device
104
protocol stack over the R
m
interface. The MT
2
device
104
, is illustrated as being logically connected to the BS/MSC
106
protocol stack over the U
m
interface. The BS/MSC
106
protocol stack is, in turn, shown as being logically connected to the IWF
108
protocol stack over the L interface.
As an illustration, the protocols depicted in
FIG. 2
, operate as follows: the PPP layer on the TE
2
102
device associated with the Rm interface (i.e., PPP
R
208
), encodes packets from the upper layer protocols
204
, and the network layer IP protocol
206
. The PPP
R
layer
208
then transmits the packets across the R
m
interface using an applicable protocol, such as, for example, the TIA/EIA 232-F protocol
210
, and the packets are received by the TIA/EIA-232-F-compatible port on the MT
2
device
104
. The TIA/EIA-232-F standard is defined in “INTERFACE BETWEEN DATA TERMINAL EQUIPMENT AND DATA CIRCUIT-TERMINATING EQUIPMENT EMPLOYING SERIAL BINARY DATA INTERCHANGE”, published in October 1997 and herein incorporated by reference. It is to be understood that other standards or protocols known
Brown Charles D.
Chin Vivian
Lee John J
Qualcomm Incorporated
Seo Howard H.
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