Paramvir P Bahl, Age 59Bellevue, WA

6385454, May 7, 2002

Oct 13, 1998

09/170822

Paramvir Bahl - Issaquah WA
Tong Liu - Waltham MA

Microsoft Corporation - Redmond WA

H04Q 722

455450, 455440, 455452, 455456

Wireless networks require efficient mobility management to cope with frequent mobile handoff and rerouting of connections. The invention treats this problem by developing a hierarchical prediction engine that employs approximate pattern matching and Kalman filtering techniques to yield an accurate prediction of both the immediate next cell to be entered by the mobile and the overall or global route of the mobile unit in the wireless cellular network. The prediction of the mobiles future movement is used by the network to reserve resources, relieve congestion, reduce latency, and optimize the establishment of routes in the wireless cellular network.

6438136, Aug 20, 2002

Oct 9, 1998

09/169121

Paramvir Bahl - Issaquah WA

Microsoft Corporation - Redmond WA

H04L 1243

370458

A full service channel access protocol that supports the integrated transport of voice, video and data communications is provided by dividing a communication channel into a plurality of frames, dividing each of the frames into a plurality of slots, and dividing some of the plurality of slots into a plurality of mini-slots. The mini-slots are provided for use by the multiple communication sources to request the establishment of a new voice, data, or video transmission connection over the communication channel. Additionally, a second one of the plurality of slots is divided into a plurality of second mini-slots for use by the multiple communication sources to request the establishment of a new voice, data, or video transmission connection over the communication channel and for use by the multiple communication sources to augment an existing video connection over the communication channel. The method enables timely and power efficient communications over communication network.

6445701, Sep 3, 2002

Oct 9, 1998

09/169418

Paramvir Bahl - Issaquah WA

Microsoft Corporation - Redmond WA

H04J 316

370368, 370443, 370468

A full service channel access protocol that supports the integrated transport of voice, video and data communications is provided by dividing a communication channel into a plurality of frames, dividing each of the frames into a plurality of slots, and dividing some of the plurality of slots into a plurality of mini-slots. The mini-slots are provided for use by the multiple communication sources to request the establishment of a new voice, data, or video transmission connection over the communication channel. Additionally, a second one of the plurality of slots is divided into a plurality of second mini-slots for use by the multiple communication sources to request the establishment of a new voice, data, or video transmission connection over the communication channel and for use by the multiple communication sources to augment an existing video connection over the communication channel. The method enables timely and power efficient communications over communication network.

6507587, Jan 14, 2003

Oct 9, 1998

09/169583

Paramvir Bahl - Issaquah WA

Microsoft Corporation - Redmond WA

H04B 7212

370443, 370348, 370458, 370477, 725 95

A slot assignment technique for assigning slots to a video communiction source in a slotted communication channel entails, in embodiments, using a slot from the channel to issue a coded request message containing a bit pattern indicative of a number of other slots that the video communication source requires for transmitting video information. At the receiver, the number of slots that the video communication source requires for transmitting video information is identified from the coded request via a lookup table. The requiste number of slots in the communication channel can then be allocated to the video commuinication source to transmit the video information. The bit pattern indicative of the number of slots that the video communication source requires generally comprises less data than would an uncoded request for the same number of slots. In this way, request limitations imposed by request slot size may be overcome.

6519004, Feb 11, 2003

Oct 9, 1998

09/169120

Paramvir Bahl - Issaquah WA

Microsoft Corporation - Redmond WA

H04N 712

3483851, 370468, 37524011

An adaptive region-based, multi-scale, motion compensated video compression algorithm design for transmission over hostile communication channels. The algorithm is embodied in a video encoder that extracts spatial information from video frames to create video regions that are then decomposed into sub-bands of different perceptual importance before being compressed and transmitted independently. The system further uses unequal error protection, prioritized transmission and reconstruction to guarantee a minimum spatial and temporal resolution at the receiver. In particular, the region segmented frames bound both spatial and temporal error propagation within frames. A connection-level inter-region statistical multiplexing scheme is also employed to ensure optimal utilization of reserved transmission bandwidth.

6618363, Sep 9, 2003

Oct 9, 1998

09/169122

Paramvir Bahl - Issaquah WA

Microsoft Corporation - Redmond WA

H04Q 700

370329, 370347, 370366, 370369, 370375, 3483851, 3483901

A full service channel access protocol that supports the integrated transport of voice, video and data communications is provided by dividing a communication channel into a plurality of frames, dividing each of the frames into a plurality of slots, and dividing some of the plurality of slots into a plurality of mini-slots. The mini-slots are provided for use by the multiple communication sources to request the establishment of a new voice, data, or video transmission connection over the communication channel. Additionally, a second one of the plurality of slots is divided into a plurality of second mini-slots for use by the multiple communication sources to request the establishment of a new voice, data, or video transmission connection over the communication channel and for use by the multiple communication sources to augment an existing video connection over the communication channel. The method enables timely and power efficient communications over communication network.

6629151, Sep 30, 2003

Dec 8, 1999

09/456858

Paramvir Bahl - Issaquah WA

Microsoft Corporation - Redmond WA

H04L 1206

709250, 709224, 709223, 370352, 370353

Interfaces between wireless network hardware and software can provide for wireless-specific functionality and allow software to take advantage of the unique capabilities of a wireless network. These interfaces can perform static queries, dynamic queries, or a request to set attributes. Static queries can be information which does not change depending on the wireless connection, dynamic queries will attempt to obtain information based on the current wireless connection maintained by the hardware, and setting attributes allows the software components to change parameters within the hardware components. Additionally, callback functions are provided to allow the wireless network hardware to alert software to key events.

6664925, Dec 16, 2003

May 2, 2002

10/137912

Timothy M. Moore - Bellevue WA
Joseph Polastre - Berkeley CA
Warren Barkley - Mill Creek WA
Paramvir Bahl - Sammamish WA

Microsoft Corporation - Redmond WA

G01S 302

342451, 342450, 342463

A mobile computer establishes a wireless communication session with a wireless access point of a computer network. The location of each wireless access point is known and obtainable either from a database on the network or from the access points themselves. The strengths of wireless signals passing between the mobile computer and multiple wireless access points of the network, including the access point with which the mobile computer has established the session are measured at multiple time intervals. The measurements may be taken at the mobile computer itself or at the wireless access points. The measured strength values are then weighted according to such factors as whether the mobile computer has already established a communication session with the access point from which the sample was taken, and how old the sample is. For each location, the weighted strength values obtained for access points in that location are summed. The location having the highest sum is deemed to be the location of the mobile computer.