Yiping X Wang

Author:

Yiping Wang

ISBN #:

0929851110

US Patent:

6587447, Jul 1, 2003

Filed:

Sep 29, 1999

Appl. No.:

09/410209

Inventors:

Yiping Wang - Plano TX
David Paranchych - Richardson TX
Ashvin Chheda - Dallas TX

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04B 7216

US Classification:

370335, 370332

Abstract:

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 possible transmission modes including (a) when a gating-off of the traffic channel occurs, and (b) when no gating-off of traffic occurs and normal traffic is being transmitted, and (2) controlling a change in the receiver target bit energy to noise spectrum density ratio Eb/No in response to the detection step so that a receiver target Eb/No is increased only when the detecting step does not indicate a gating-off of traffic has occurred.

US Patent:

6590874, Jul 8, 2003

Filed:

Sep 30, 1999

Appl. No.:

09/410208

Inventors:

Yiping Wang - Plano TX
David Paranchych - Richardson TX
Ashvin Chheda - Dallas TX

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04B 7185

US Classification:

370318, 370252, 370320, 455522

Abstract:

A signalling method for controlling unnecessary power increases and call drop during discontinuous transmission (DTX) mode of a frame-based transmission system. The signalling 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 possible transmission modes including (a) when a gating-off of the traffic channel occurs, and (b) when no gating-off of traffic occurs and normal traffic is being transmitted, and (2) controlling a change in the receiver target bit energy to noise spectrum density ratio Eb/No in response to the detection step so that a receiver target Eb/No is increased only when the detecting step does not indicate a gating-off of traffic has occurred.

US Patent:

6898192, May 24, 2005

Filed:

Dec 29, 2000

Appl. No.:

09/751273

Inventors:

Ashvin H. Chheda - Plano TX, US
Yiping Wang - Plano TX, US

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04B007/16
H04B007/216
H04J013/00

US Classification:

370311, 370320, 370342, 455522

Abstract:

The method and apparatus of the present invention includes reducing the power level by a delta value in excess of the reduction in the bit error rate and its proportionate power reduction rate in response to a data rate change. If the bit rate is reduced to eighth, then the power transmission level can be reduced to a value of 1/(8+Δ) relative to FULL power. As an additional aspect of the present invention, the base station controller also generates a selectable frame error rate calculates the corresponding signal to noise ratios that will provide the commanded frame error rate. The FER may be selected according to data type or source or according to power transmission level and for data rate.

US Patent:

6996056, Feb 7, 2006

Filed:

May 31, 2001

Appl. No.:

09/871581

Inventors:

Ashvin H. Chheda - Plano TX, US
Yiping Wang - Plano TX, US
Mehmet Yavuz - Irving TX, US

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04J 11/00

US Classification:

370209, 370320, 370335, 370342, 370441

Abstract:

A method and apparatus for enabling Orthogonal codes to be reused within the same cell of a code division multiple access telecommunication network includes an base station transceiver system that comprises logic circuitry for enabling the base station transceiver system to reuse Orthogonal codes in a manner that reduces the likelihood of collision between two mobile stations having the same Orthogonal code and corresponding communication channels. The method of the present invention specifically includes analyzing user characteristics including factors such as his physical movement, location and mobile station communication type, as well as angular placement.

US Patent:

7110785, Sep 19, 2006

Filed:

Oct 25, 2000

Appl. No.:

09/696491

Inventors:

David W. Paranchych - Richardson TX, US
Yiping Wang - Plano TX, US
Ashvin H. Chheda - Plano TX, US

Assignee:

Nortel Networks Limited - St. Laurent, Quebec

International Classification:

H04B 7/00

US Classification:

455522, 455 69, 455437, 455442, 4552262, 4552263, 370318, 370252, 370320, 370358, 370335, 370342, 375358, 375340, 375200

Abstract:

A mobile communications system includes base stations and mobile units. A power control scheme is provided in which a mobile unit can enter into a discontinuous transmission (DTX) mode. During DTX mode, the mobile unit is not transmitting traffic channels that can be monitored to determine frame errors so that the target ratio of energy per bit to noise spectral density (target Eb/No) can be adjusted. Instead, the base station monitors bit errors of bits in a pilot channel communicated by the mobile unit during DTX mode. Using this technique, the target Eb/No can be adjusted even when the mobile unit is not transmitting traffic channels, so that outer-loop power control can be performed. A number of mechanisms can also be used to detect when a mobile unit has entered DTX mode.

US Patent:

20060183497, Aug 17, 2006

Filed:

Apr 11, 2006

Appl. No.:

11/401591

Inventors:

David Paranchych - Richardson TX, US
Yiping Wang - Plano TX, US
Ashvin Chheda - Plano TX, US

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04B 7/00

US Classification:

455522000

Abstract:

A mobile communications system includes base stations and mobile units. A power control scheme is provided in which a mobile unit can enter into a discontinuous transmission (DTX) mode. During DTX mode, the mobile unit is not transmitting traffic channels that can be monitored to determine frame errors so that the target ratio of energy per bit to noise spectral density (target Eb/No) can be adjusted. Instead, the base station monitors bit errors of bits in a pilot channel communicated by the mobile unit during DTX mode. Using this technique, the target Eb/No can be adjusted even when the mobile unit is not transmitting traffic channels, so that outer-loop power control can be performed. A number of mechanisms can also be used to detect when a mobile unit has entered DTX mode.

US Patent:

20130044651, Feb 21, 2013

Filed:

Aug 15, 2011

Appl. No.:

13/210033

Inventors:

Yiping Wang - Allen TX, US
Jun Li - Richardson TX, US

International Classification:

H04J 3/00

US Classification:

370280

Abstract:

A method for configuring a Time Division Duplex (TDD) Uplink/Downlink (UL/DL) allocation of a user equipment (UE) in a Long Term Evolution (LTE) network may include receiving an indicator, from an enhanced NodeB in the LTE network, on a physical channel identifying a TDD configuration for the UE and automatically updating the TDD UL/DL allocation of the UE in accordance with the TDD configuration.

US Patent:

20130044652, Feb 21, 2013

Filed:

Aug 15, 2011

Appl. No.:

13/210066

Inventors:

Yiping Wang - Allen TX, US
Jun Li - Richardson TX, US

International Classification:

H04J 3/00

US Classification:

370280

Abstract:

A method for configuring a Time Division Duplex (TDD) Uplink/Downlink (UL/DL) allocation in a user equipment (UE) in a Long Term Evolved (LTE) network can include receiving, at a predefined period, during a connected state, each information block transmitted by an enhanced NodeB in the LTE network. Each information block may be transmitted in accordance with a fixed schedule having a predefined transmission period and includes information identifying a TDD configuration. Whether an updating of the TDD configuration is required can be determined for the UE based, at least in part, on the information identifying the TDD configuration in the information block, the information identifying the TDD configuration indicating an updated TDD configuration. In response to at least identifying the updated TDD configuration, the TDD UL/DL allocation of the UE can be automatically updated in accordance with the updated TDD configuration.