1
Thomas F La Porta, Ramachandran Ramjee: Dynamic address assignment for wireless devices accessing packet-based wired networks. Lucent Technologies, Matthew J Hodulik, Guy Eriksen, August 13, 2002: US06434134 (145 worldwide citation)

The number of packet routing addresses utilized within a wired subnet offering wireless services via subnet base stations is reduced by assigning a packet routing address to a wireless device accessing a wired subnet upon power up of the wireless device. A Dynamic Host Configuration Protocol (DHCP) ...


2
Alfred Vaino Aho, Richard Dennis Gitlin, Ramachandran Ramjee, Thomas Yat Chung Woo: Method of operating a portable communication device. Lucent Technologies, Barry H Freedman, March 6, 2001: US06198941 (138 worldwide citation)

A method of effectuating a change in the operation of a portable communication device such as a laptop or palmtop computer, a personal digital assistant (PDA), or a cellular telephone. The device can communicate with a remote host or server using one of two or more different communication arrangemen ...


3
Thomas F La Porta, Ramachandran Ramjee, Malathi Veeraraghavan: Network-based migrating user agent for personal communication services. Lucent Technologies, Gibbons Del Deo Dolan Griffinger & Vecchione, July 4, 2000: US06085086 (138 worldwide citation)

The present invention is a user process that resides in network nodes to act as an agent for mobile terminals in, for example, PCS environments. The user process handles negotiation and complex signaling functions for the user, thus reducing the amount of signaling traffic that must travel over the ...


4
Ramachandran Ramjee, Thomas F La Porta, Kannan Varadhan, Luca Salgarelli, Mark Haner, Arun Narayan Netravali, Gerard Terence Foster: Wireless access of packet based networks. Lucent Technologies, January 11, 2005: US06842462 (133 worldwide citation)

A General Packet Radio Service (GPRS) Accessed Extended Mobile Internet Protocol (EMIP) [G-EMIP] network is provided for wireless mobile device access to external packet data networks. Domains are defined to incorporate a subnet of standard GPRS and EMIP network entities accessed through a Domain Ro ...


5
Thomas F La Porta, Kazutaka Murakami, Ramachandran Ramjee, Sandra R Thuel, Kannan Varadhan: Wireless access to packet-based networks. Lucent Technologies, Matthew J Hodulik, November 25, 2003: US06654359 (121 worldwide citation)

Domains are defined to incorporate a subnet including a plurality of base stations and routers. Base stations are used by mobile devices to attach to the wired portion of a packet-based network, such as the Internet, and exchange packets thereover with a correspondent node. Local mobility between do ...


6
Thomas F La Porta, Ramachandran Ramjee, Kannan Varadhan: Packet tunneling optimization to wireless devices accessing packet-based wired networks. Lucent Technologies, Guy H Erickson, Matthew J Hodulik, December 17, 2002: US06496505 (114 worldwide citation)

A tunneling optimization is described in which packets are forwarded from a home agent to a mobile device by co-locating a foreign agent corresponding to a mobile device at the mobile device. When a mobile device acquires a new foreign agent, the mobile device notifies the home agent as to the corre ...


7
Thomas F La Porta, Kazutaka Murakami, Ramachandran Ramjee, Sandra R Thuel, Kannan Varadhan: Two phase local mobility scheme for wireless access to packet based networks. Lucent Technologies, Matthew J Hodulik, July 13, 2004: US06763007 (112 worldwide citation)

Local mobility within a subnet is supported by classifying wireless base stations, and the routers used to forward packets to those base stations, within defined domains. Domains are defined to incorporate a subnet having a plurality of base stations. Base stations are used by mobile devices to atta ...


8
Richard Wayne Buskens, Michael P Deitz, Thomas F La Porta, Yow Jian Lin, Kazutaka Murakami, Ramachandran Ramjee: Cluster mobile switching center. Lucent Technologies, Barry H Freedman, February 20, 2001: US06192250 (47 worldwide citation)

A “cluster mobile switching center” (cMSC) is arranged to perform the switching and control functions of a conventional mobile switching center (MSC), including, if desired, the additional functions of a conventional visitor location register (VLR). The cMSC is implemented on distributed processors ...


9
Ramesh Nagarajan, Ramachandran Ramjee, Donald Fred Towsley: Call admission control for wireless networks. Lucent Technologies, Steven R Bartholomew, March 16, 1999: US05884174 (43 worldwide citation)

Improved wireless telephone call admission methods for admitting new and/or handoff calls into a wireless telephone network having a plurality of communications channels. One such method, fractional guard channel call admission, effectively reserves a non-integral number of guard channels for handof ...


10
Thomas F La Porta, Ramachandran Ramjee, Malathi Veeraraghavan: Method and system for distributed control in wireless cellular and personal communication systems. Lucent Technologies, August 19, 1997: US05659544 (36 worldwide citation)

A system for distributed control in wireless cellular and personal communication systems includes separate servers for performing call control and connection control functions, thereby obviating the need for a mobile switching or other switch to be anchored for the duration of a call. During a regis ...