Telecommunications – Radiotelephone system – Special service
Reexamination Certificate
2000-03-30
2003-04-01
To, Doris H. (Department: 2682)
Telecommunications
Radiotelephone system
Special service
C455S412100, C455S507000, C370S363000, C370S449000, C379S229000, C379S220010
Reexamination Certificate
active
06542734
ABSTRACT:
BACKGROUND
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 and apparatus for detecting a specified event in a wireless communication system.
2. Description of Related Art
A. Wireless Communications
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. The life blood of this infrastructure is the packet-oriented Internet Protocol (IP) which provides various services, including the addressing and routing of packets (datagrams) between local and wide area networks (LANs and WANs). IP protocol is defined in Request For Comment 791 (RFC 791) entitled, “INTERNET PROTOCOL DARPA INTERNET PROGRAM PROTOCOL SPECIFICATION,” dated September 1981.
The IP protocol is a network layer protocol that encapsulates data into IP packets for transmission. Addressing and routing information is affixed to the header of the packet. IP headers, for example, 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. On the other hand, a transport layer, which comprises either a Transmission Control Protocol (TCP) or a User Datagram Protocol (UDP), is used to address to particular applications.
The current trend is for mobile users to use mobile computers, such as laptop or palmtop computers, in conjunction with wireless communication devices, such as cellular or portable phones, to access the Internet. That is, just as users conventionally employ “wired” communication devices to connect their computers to land-based networks, mobile users will use wireless communication devices, commonly referred to as “mobile stations” (MSs), to connect their mobile terminals to such networks. As used herein, the mobile station or MS will refer to any subscriber station in the public wireless radio network.
FIG. 1
(Prior Art) illustrates a high-level block diagram of a wireless data communication system in which the MS
110
communicates with an Interworking Function (IWF)
108
via a Base Station/Mobile Switching Center (BS/MSC)
106
. The IWF
108
serves as the access point to the Internet. IWF
108
is coupled to, and often co-located with, BS/MSC
106
, which may be a conventional wireless base station as is known in the art. Another standard protocol that addresses the wireless data communication system is the 3
rd
Generation Partnership Project
2
(“3GPP2”) entitled “WIRELESS IP NETWORK STANDARD,” published in December 1999. The 3G Wireless IP Network Standard, for example, includes a Packet Data Serving Node (“PDSN”), which functions like the IWF
108
.
There are various protocols that address the data communications between the MS
110
and the IWF
108
. For example, Telecommunications Industry Association (TIA)/Electronics Industries Association (EIA) Interim Standard IS-95, entitled “MOBILE STATION-BASE . STATION COMPATIBILITY STANDARD FOR DUAL-MODE WIDEBAND SPREAD SPECTRUM CELLULAR SYSTEM,” published in July 1993, generally provides a standard for wideband spread spectrum wireless communication systems. Moreover, standard TIA/EIA IS-707.5, entitled “DATA SERVICE OPTIONS FOR WIDEBAND SPREAD SPECTRUM SYSTEMS: PACKET DATA SERVICES,” published in February 1998, defines requirements for support of packet data transmission capability on TIA/EIA IS-95 systems and specifies packet data bearer services that may be used for communication between the MS
110
and the IWF
108
via the BS/MSC
106
. Also, 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, also define requirements for packet data transmission support on TIA/EIA IS-95 systems. In addition, another standard protocol that addresses communications between the MS
110
and the IWF
108
is the TIA/EIA IS-2000, entitled “INTRODUCTION TO CDMA 2000 STANDARDS FOR SPREAD SPECTRUM SYSTEMS,” published in July 1999.
IS-707.5 introduces communication protocol option models between the MS
110
and the BS/MSC
106
(the Um interface), and between the BS/MSC
106
and the IWF
108
(the L interface). For instance, a Relay Model represents the situation where a Point to Point Protocol (PPP) link exists on the Um interface between the MS
110
and the IWF
108
. The PPP protocol is described in detail in Request for Comments 1661 (RFC 1661), entitled “THE POINT-TO-POINT PROTOCOL (PPP).”
FIG. 2
(Prior Art) is a diagram of the protocol stacks in each entity of the IS-707.5 Relay Model. At the far left of the figure is a communication protocol stack, shown in conventional vertical format, showing the protocol layers running on the MS
110
. The MS
110
protocol stack is illustrated as being logically connected to the BS/MSC
106
protocol stack over the Um interface. The BS/MSC
106
protocol stack is, in turn, illustrated as being logically connected to the IWF
108
protocol stack over the L interface.
The operation depicted in
FIG. 2
is as follows: an upper layer protocol
200
entity, such as an application program running on the MS
110
, has a need to send data over the Internet. A representative application may be a web browser program (e.g., Netscape Navigator™, Microsoft Internet Explorer™). The web browser requests a Universal Resource Locator (URL), such as HYPERLINK “http://www.Qualcomm.com/”. A Domain Name System (DNS) protocol, also in the upper layer protocol
200
, translates the textual host name www.Qualcomm.com to a 32-bit numeric IP address by the use of a domain name resolution, which translates names to addresses in the Internet. The Hypertext Transfer Protocol (HTTP), which is also an upper layer protocol
200
, constructs a GET message for the requested URL, and specifies that TCP will be used to send the message and for HTTP operations. The transport layer
202
uses port
80
, which is known in the art, as the destination port to route the HTTP operations to the application.
The TCP protocol, which is a transport layer protocol
202
, opens a connection to the IP address specified by DNS and transmits the application-level HTTP GET message. The TCP protocol specifies that the IP protocol will be used for message transport. The IP protocol, which is a network layer protocol
204
, transmits the TCP packets to the IP address specified. The PPP, which is a link layer protocol
206
, encodes the IP packets and transmits them to the relay layer protocol
208
. An example of the relay layer protocol
208
may be the illustrated TIA/EIA-232F standard, which is defined in “INTERFACE BETWEEN DATA TERMINAL EQUIPMENT AND DATA CIRCUIT-TERMINATING EQUIPMENT EMPLOYING SERIAL BINARY DATA INTERCHANGE,” published in October 1997. It is to be understood that other standards or protocols known to artisans of ordinary skill in the art may be used to define the transmission across the layers. For example, other applicable standards may include the “UNIVERSAL SERIAL BUS (USB) SPECIFICATION, Revision 1.1,” published in September 1998, and the “BLUETOOTH SPECIFICATION VERSION 1.0A CORE,” published in July 1999. Last, the relay layer protocol
208
passes the PPP packets to a Radio Link Protocol (RLP)
210
and then to the IS-95 protocol
212
for transmission to the BS/MSC
106
over the Um interface. The RLP protocol
210
is defined in the IS-707.2 standard, entitled “DATA SERVICE OPTIONS FOR WIDEBAND SPREAD SPECTRUM SYSTEMS: RADIO LINK PROTOCOL
Abrol Nischal
Gilkey Harold
Brown Charles D
Qualcomm Incorporated
Seo Howard H.
To Doris H.
Wadsworth Philip R
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