Vijay Sharmila Subramanian

US Patent:

6987738, Jan 17, 2006

Filed:

Jan 12, 2001

Appl. No.:

09/759846

Inventors:

Vijay G. Subramanian - Chicago IL, US
Rajeev Agarwal - Northbrook IL, US
Richard J. La - Buffalo Grove IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 12/26

US Classification:

370252, 370328, 370468

Abstract:

A method of performing packet level transmission scheduling in a communications systems including a plurality of cells, each cell including a base station and plurarity of mobile stations. The method performs scheduling while considering radio resource allocation at the wireless access node. In a schedule plan phase of the method, average power and average effective data rate are determined for all mobile stations in the system. In addition, the planned fractions of frames ρ that each mobile in the system will transmit is determined so that resources are allocated fairly. In the actual schedule phase of the method, current power and effective data rate values are compared to the average power values. This information along with the ρ values is used to determine the actual schedule of packet transmissions for all mobiles in a particular cell.

US Patent:

7447154, Nov 4, 2008

Filed:

Nov 30, 2004

Appl. No.:

10/999541

Inventors:

John M. Harris - Chicago IL, US
Vijay G. Subramanian - Chicago IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 1/00

US Classification:

370232

Abstract:

A process () to facilitate determination of a particular data rate to use when communicating data with respect to a mobile station comprises providing () historical information regarding past radio frequency channel conditions, data quantity information () as corresponds to a current data file to be transmitted, and assessing () historical data transmission as correspond to the mobile station. One then selects () a data rate as a function of such information. In a preferred embodiment, this comprises varying a time scaling factor as a function of relative data file size, which time scaling factor serves to influence the extent to which past history serves to otherwise influence the selection of a particular data rate.

US Patent:

7471942, Dec 30, 2008

Filed:

May 18, 2006

Appl. No.:

11/436242

Inventors:

Vijay G. Subramanian - Chicago IL, US
Anand S. Bedekar - Arlington Heights IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 1/16
H04Q 7/20

US Classification:

4553432, 455574, 340 732, 370311

Abstract:

A method and information processing system for wirelessly transmitting at least one of a downlink channel descriptor and an uplink channel descriptor for reception by at least one wireless device (). The method comprises selecting at least one transmission time for transmitting a pointer that indicates a transmission time for a DCD and/or a UCD. The pointer is transmitted at a time between a first transmission and a second transmission of the at least one of downlink channel descriptor and uplink channel descriptor. The transmission time is selected to reduce a time interval for the at least one wireless device () to search for the at least one of the DCD and UCD. Also, a message that includes DCD information and/or UCD information associated with at least one neighboring cell can also be chosen to transmit at specifically chosen times to the at least one wireless device ().

US Patent:

7492752, Feb 17, 2009

Filed:

Apr 25, 2006

Appl. No.:

11/411753

Inventors:

John M. Harris - Chicago IL, US
Joseph R. Schumacher - Glen Ellyn IL, US
Vijay G. Subramanian - Chicago IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 7/20

US Classification:

370342, 370318, 370338, 370501, 370352, 370331, 455 68, 455522, 4555501, 455436

Abstract:

Various embodiments are described to address the need for channel maintenance/channel quality signaling that can better utilize reverse link capacity and conserve battery life. Generally expressed, a remote unit () enters () a high-rate-channel-maintenance mode in which it transmits channel maintenance signaling. When a low-rate condition is met (), the remote unit enters () a low-rate-channel-maintenance mode in which it transmits channel maintenance signaling at either a lower rate or a lower transmit power than when in the high-rate-channel-maintenance mode. Then when a high-rate condition is met (), the remote unit reenters the high-rate-channel-maintenance mode.

US Patent:

7539214, May 26, 2009

Filed:

Dec 8, 2004

Appl. No.:

11/007465

Inventors:

John M. Harris - Chicago IL, US
Vijay G. Subramanian - Chicago IL, US
Fan Wang - Vernon Hills IL, US
Jyoti Black - St. Charles IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04J 3/24

US Classification:

370473, 370471

Abstract:

A mobile station () senses () at least one boundary of a wireless communication packet () which includes a plurality of frames. The mobile station () then determines () at least a first group () and a second group () of frames at least in part in relation to the sensed boundary. The first group () of frames is received () at a first target reliability, and the second group () of frames is received () at a second target reliability. Optionally, the frames are sent () or received at a variable reliability in relation to the frames' distances from one or more boundaries () of the packet ().

US Patent:

7558577, Jul 7, 2009

Filed:

Nov 10, 2005

Appl. No.:

11/271069

Inventors:

Matt J. Dillon - Hawthorn Woods IL, US
John M. Harris - Chicago IL, US
Vijay Subramanian - Chicago IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04W 36/00
H04W 72/00

US Classification:

455443, 455450

Abstract:

Methods for dividing resources of base stations among multiple mobile stations are provided. According to one embodiment of the invention, an overlapping group having a plurality of mobile stations that are overlapped between at least two cellular areas are generated () to provide a plurality of overlapping mobile stations, which are ranked () based, at least in part, on at least one threshold. A maximum number of the plurality of overlapping mobile stations having a highest ranking that can be assigned with reserved frequency and timing assignments are selected () to provide a plurality of selected overlapping mobile stations. These selected overlapping mobile stations are assigned () using the reserved frequency and timing assignments.

US Patent:

7564820, Jul 21, 2009

Filed:

Nov 8, 2004

Appl. No.:

10/983499

Inventors:

Vijay G. Subramanian - Chicago IL, US
Rajeev Agrawal - Northbrook IL, US
Randall Berry - Chicago IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 7/216
H04L 27/28

US Classification:

370335, 375260

Abstract:

A method and apparatus for resource allocation and scheduling within a wireless communication system is provided herein. During resource allocation, a maximum total system transmit power (P), a maximum number of codes available (N), a maximum number of codes for each user in the system (N=(N,. . . , N)), a maximum SINR value (S=(S,. . . , S)) for each user in the system, and a SINR per watt of transmit power for each user in the system (e=(e,. . . , e)) is received by a scheduler. Scheduler then outputs an optimal number of codes per user (n) and power levels per user to (p).

US Patent:

7586990, Sep 8, 2009

Filed:

Nov 22, 2005

Appl. No.:

11/286944

Inventors:

Vijay G. Subramanian - Chicago IL, US
Rajeev Agrawal - Northbrook IL, US
Randall Berry - Chicago IL, US
Jiawei Huang - Princeton NJ, US

Assignee:

Motorola, Inc. - Schaumburg IL
Northwestern University - Evanston IL

International Classification:

H04K 1/10
H04L 27/00

US Classification:

375260, 375316

Abstract:

A method and system for allocating a plurality of subcarriers to a plurality of subscriber devices in a wireless network. A set of characteristics is identified () for a transmission on each of the plurality of subcarriers. A dynamic weight is assigned () to at least one subscriber device of the plurality of subscriber devices at each decision instance of the transmission corresponding to the at least subscriber device. The assignment of the dynamic weight is based on at least one of a throughput, delay, packet-loss and queue length requirement of one or more flows of the subscriber device. Further, a set of optimum values is determined () for the set of characteristics based on the dynamic weights and channel feedback. The plurality of subcarriers are allocated () to the at least one subscriber device based on at least one optimum value of the set of optimum values.