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| CDMA mobile communication system and method with improved phase correction features |
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| Method for determining hand-off candidates in a neighbor set in a CDMA communication system |
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| Delay line time compression correlation circuit |
| OF THE DISCLOSURE FIG. 1 is a schematic representation of a control counter 10 which provides the S... |
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| Equalizer and equalizing circuit using the same |
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| Loran-C signal processor |
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Mobility management in wireless internet protocol networks
| Details |
Inventors: Reddy, Joseph Soma; Acampora, Anthony;
Assignee: The Regents of the University of California (Oakland, CA)
Primary Examiner: Maung; Nay
Assistant Examiner: Sharma; Sujatha
Attorney, Agent or Firm: Fish & Richardson P.C.
Handoff of (i) a mobile wirelessly communicating device—a mobile—between (ii) a plurality of stationary base stations within cells within a domain of (iii) a stationary gateway router all within (iv) a communications network based on the Internet Protocol (IP) is without interchange of control, and responsive to the mobile, only. The gateway router assigns to the mobile at a time before the handoff IP addresses suitable for the mobile to connect to the gateway router through all the plurality of base stations of the domain. Unilaterally deriving a handoff decision to switch base stations, the mobile directs its wireless communications link to a new base station where signal level registration is performed. Responsive to a link layer trigger at the new base station, the gateway router is informed of the handoff, and both the router and the mobile independently construct the mobile's new IP address. Handoff latency is typically 40 ms. |
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DETAILED DESCRIPTION In a wireless cellular communications network based on the Internet Protocol (IP) where packets to and from a mobile wirelessly communicating device—called a mobile—(i) are routed on (most commonly) land lines up to stationary base stations by use of IP routers, (ii) are routed between large wireless domains (partitioned from the global wireless infrastructure) by a macromobility protocol, and (iii) are routed intradomain, including during handoffs between base stations, by a micromobility protocol, the present invention contemplates a new micromobility protocol and mobility management scheme.
In particular, the present invention contemplates handing off a mobile wirelessly communicating device—called "a mobile"—between successive base stations with very little delay relative to alternative schemes, thus minimizing risk of packet loss.
The fast handoff is realized in at least two, a first and a second, parts.
In a first part an IP network element—which may already exist—called a "gateway router" is newly programmed to manage the IP addresses of a number of mobiles that may at any one time be connected through various ones of a number of base stations communicating with, and through, this gateway router.
The gateway router in combination with its connected base stations constitutes (in one variant of the invention) a "domain".
Circa 2001, a "domain" is most typically an extended geographical area, like a city.
In a second part, the fast handoff is realized by each mobile itself, which mobile likewise programmed to enforce the micromobility protocol.
The new micromobility protocol of the present invention—which is enforced between the (i) gateway router and (ii) the mobiles within the domain of the gateway router without the active involvement of the intermediary base stations—is not difficult to understand, but does possess at least two unique characteristics.
First, at a time of connection admission of a mobile to a domain the mobile is assigned by the gateway router not merely one IP address reflective of the base station through which the mobile is instantly communicating (at time of its registration to the domain), but rather an entire set of IP addresses as besuit its potential connection to the gateway router through each and every base station in the domain (one base station at a time, of course)
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Multiplexer-related 
