1
Ashvin Chheda: Method for CDMA handoff in the vicinity of highly sectorized cells. Nortel Networks, John D Crane, Bracewell & Patterson L, July 24, 2001: US06266529 (111 worldwide citation)

A method for improved sector handoff within a sectorized communication cell utilizing a wireless communication systems. A sector handoff of a mobile radio telephone is performed in accordance with a first set of parameters if the mobile radio telephone is not in close proximity to a base antenna. Se ...


2
Ashvin Chheda, David W Paranchych: Interleaving methodology and apparatus for CDMA. Nortel Networks, Carr, March 9, 2004: US06704370 (107 worldwide citation)

Disclosed is an encoder, interleaver and splitter design approach for increasing system capacity. This is accomplished in a dual path embodiment by splitting the data stream into two subsets where one subset contains even number position bits of the original set and the other subset comprises the re ...


3
Ashvin Chheda, Ahmad Jalali: Reverse link power control using a frame quality metric. Northern Telecom, John D Crane, January 30, 2001: US06181738 (80 worldwide citation)

When the frame rate changes from eighth rate to full rate, the power control process increases the


4
Ashvin Chheda, Michael S Feeney, Ahmad Jalali: Base station power control during a soft hand-off. Nortel Networks Corporation, John D Crane, Kenneth Bolvin, June 6, 2000: US06073025 (80 worldwide citation)

The base station controller monitors the reverse link frame error rate of all the base stations involved in a soft hand-off with a radiotelephone. The average reverse link frame error rates of these base stations are then computed and the lowest of the average error rates is found. The last known tr ...


5
Ashvin Chheda, Ahmad Jalali: Method of optimizing neighbor set during soft handoff of a mobile unit in a CDMA cellular environment. Northern Telecom, Haynes and Boone L, August 31, 1999: US05946621 (68 worldwide citation)

System and method for optimally updating a neighbor set for use by a mobile unit during soft handoff of the mobile unit in a CDMA cellular telephone environment is disclosed. A two-step process is used to ensure that the individual neighbor sets of active set members are combined in a manner such th ...


6
Deepa Ramakrishna, Ahmad Jalali, Ashvin Chheda: Method for utilizing negative T—COMP to improve handoff reliability. Nortel Networks, John D Crane, Bracewell & Patterson L, May 15, 2001: US06233455 (42 worldwide citation)

A pre-determined negative constant is utilized in soft handoff mode to permit a new pilot signal to be added to an wireless phone's active set. The negative constant is combined with the weakest pilot signal in the active set and then compared to the new pilot signal strength which allows the n ...


7
Ashvin Chheda, James Weisert, Andy McGregor: Selectable mode vocoder management algorithm for CDMA based networks. Nortel Networks, Garlick Harrison & Markison, James A Harrison, October 10, 2006: US07120447 (41 worldwide citation)

A method and apparatus to dynamically control selectable vocoder rates in a CDMA network to optimally improve forward and reverse link capacity as necessary. To improve capacity, a number of vocoder rates are used, each requiring a different average data rate and providing a different level of voice ...


8
Ashvin Chheda, Farhad Bassirat: Communication system having optimum resource arrangements in a multi-sectored environment and method therefor. Nortel Networks Corporation, Carr & Storm L, November 21, 2000: US06151512 (39 worldwide citation)

A configuration of base stations and sectors within cells of a CDMA wireless communication network provide greater call handling capacity. By optimally configuring sectors of a cell controlled by multiple base stations, fewer channel elements are required to implement the desired service and a resul ...


9
Yiping Wang, David Paranchych, Ashvin Chheda: Method and system for performing outer loop power control in discontinuous transmission mode. Nortel Networks, John D Crane, Bracewell & Patterson L, July 1, 2003: US06587447 (38 worldwide citation)

A method for controlling unnecessary power increases and call drop during discontinuous transmission (DTX) mode of a frame-based transmission system. The method comprises the steps of (1) detecting, at a receiver end of the transmission system a status of a transmitted frame indicating one of two po ...


10
Ashvin Chheda, Michael S Feeney, Ahmad Jalali: Process for switching between IS-95 forward power control and fast forward power control. Nortel Networks Corporation, Paul W Fulbright, October 5, 1999: US05963870 (37 worldwide citation)

The power control process switches between IS-95 forward power control and fast forward power control using either speed or hand-off status information from the mobile radiotelephone. If the received information indicates either a slower speed or the number of communication links is less than a pred ...