 X-ray casette with a snap-action closure system |
| What we claim is: 1. An X-ray cassette comprising a substantially rigid lower rectangular tray ... |
|
| Reinforced flexible x-ray film cassette |
| OF THE PREFERRED EMBODIMENT Referring now to the drawing in detail, and first to FIG. 1 thereof, ... |
|
| X-ray film holding apparatus providing tight contact between film and intensifying screen |
| According to an aspect of the present invention, there is provided an X-ray film holding apparatus ... |
|
| System for providing analog and digital telephone functions using a single telephone line |
| One skilled in the art will readily recognize that the embodiments described solve all of these ... |
|
| Soler removing bit |
| What is claimed is: 1. A solder removing bit for use in removing melted solder, comprising: a bit ... |
|
| System and method for storing and transferring information tokens in a low network communication |
| The present invention relates to interactive telecommunications services. To overcome the above ... |
|
| International call back technique with reduced post dialing delay |
| FIG. 1 illustrates a system 10, in accordance with the invention, for permitting a caller 12, ... |
|
|
Address updating of wireless mobile terminal hosts affiliated with a wired network
| Details |
Inventors: Orsic, Milo;
Assignee: Lucent Technologies Inc. (Murray Hill, NJ)
Primary Examiner: Chin; Wellington
Assistant Examiner: Jones; Prenell
Attorney, Agent or Firm: Law Office of Leo Zucker
A method of defining an address for a mobile terminal host (T/H) linked to a wired communications network, e.g, the global Internet. The method includes assigning an address to the mobile (T/H), the address corresponding in part to a first network base station to which the mobile T/H becomes linked, for example, by roaming into a cell of the base station. The address assigned to the mobile T/H is changed when the T/H roams and becomes linked to a second network base station, the changed address corresponding in part to the address of the second base station. At least one stationary terminal host in the network is informed of a current address assigned to the mobile T/H by establishing a connection between the mobile T/H and the stationary host. Message data is exchanged between the mobile and the stationary hosts as long as a connection is maintained between them. |
|
DETAILED DESCRIPTION OF THE INVENTION FIG.
1 shows a schematic representation of a wired network 10, for example, the Global Internet.
The network 10 links fixed, i.
e.
, stationary terminal host (H) users 12 and a number of network base stations (BS) 14 with one another.
Each of the base stations 14 has an associated cell 16 within which one or more mobile terminal/hosts (T/H) 18 may enter to establish a wireless link with the base station, and, thus, gain access to the wired network 10.
A protocol known as UDP (User Datagram Protocol) is currently employed in the Internet for routing and delivering message packets called "datagrams", based exclusively on a datagram's destination endpoint address (i.
e.
, IP address and protocol port).
That is, currently, UDP is "connectionless" in that message packets are transmitted from a source to a destination without any connection having first been established between the two entities.
According to the invention, the IP address of each mobile T/H 18 changes each time the T/H enters a different base station cell 16, and data packets or "datagrams" are routed to the mobile T/H according to a most recent IP address using a data header format explained below in connection with FIG.
2.
The scheme of the invention is "connection-oriented" in that message packets in the format of FIG.
2 are exchanged between a mobile and a stationary host only after (a) the two entities acknowledge a connection between them, (b) the stationary host is informed of a current address for the mobile T/H, and (c) the connection remains up.
Also, the stationary host is updated by the mobile T/H of any address change for the latter while the connection lasts, using endpoint update datagrams with formats explained below in connection with FIGS.
4 and 5.
Referred to herein as mobile UDP or "m-UDP", the present invention contemplates the opening and closing of duplex m-UDP connections between communicating (peer) m-UDP entities, viz.
, mobile and stationary hosts equipped to communicate with one another across the Internet
|
|
Caller ID 
