公开(公告)号：DE60043791D1

公开(公告)日：2010-03-18

申请号：DE60043791

申请日：2000-11-27

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALACHANDRAN KRISHNA ,  NANDA SANJIV ,  SAMARAS KONSTANTINOS

IPC: H04B7/26 ,  H04J3/16 ,  H04Q7/36

Abstract: A method and system for reducing delay in wireless communications by use of a burst based access and assignment system. The method for setting up a communication channel uses short burst(s) (essentially a slot of a time frame). Time is saved by keeping the uplink and downlink channels flexible and independent of each other. Thus less time is used trying to fit all requests and responses into constrained choices as in previous protocols. The result is less delay to the mobile user and greater usage density for the wireless service provider.

公开(公告)号：DE602005004757D1

公开(公告)日：2008-03-27

申请号：DE602005004757

申请日：2005-12-15

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALACHANDRAN KRISHNA ,  KANG JOSEPH H

Abstract: In a wireless communications system which hops from frequency to frequency, rather than hopping according to a fixed dwell interval and a predetermined pseudo-random hop sequence, a quality-based frequency hopping methodology is defined in which a new frequency is hopped to when the channel quality on the current frequency degrades based on the measured value or values of one or more predetermined metrics that are associated with channel quality. When triggered to hop to a next frequency, the hop-to-frequency may be the next frequency in the pseudo-random hop sequence known to both the transmitter and receiver or, in order to improve the reliability of communications, may be determined based on channel quality measurements on different potential hop-to-frequencies.

公开(公告)号：DE69834783D1

公开(公告)日：2006-07-20

申请号：DE69834783

申请日：1998-08-18

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALACHANDRAN KRISHNA ,  KADABA SRINIVAS R ,  NANDA SANJIV ,  EJZAK RICHARD PAUL

IPC: H04L1/20 ,  H04L27/00 ,  H03M13/23 ,  H04B7/26 ,  H04B17/00 ,  H04L1/00 ,  H04L1/12 ,  H04L27/18 ,  H04L27/34 ,  H04W36/30 ,  H04W72/08

公开(公告)号：AT303023T

公开(公告)日：2005-09-15

申请号：AT99957511

申请日：1999-11-03

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALACHANDRAN KRISHNA ,  EJZAK RICHARD P ,  NANDA SANJIV

IPC: H04Q7/38 ,  H04L1/00 ,  H04L1/18

公开(公告)号：CA2263060C

公开(公告)日：2003-12-09

申请号：CA2263060

申请日：1999-02-26

Applicant: LUCENT TECHNOLOGIES INC

Inventor： NANDA SANJIV ,  EJZAK RICHARD PAUL ,  BALACHANDRAN KRISHNA ,  KADABA SRINIVAS R

IPC: H04B17/00 ,  H03M13/23 ,  H04B1/10 ,  H04B7/26 ,  H04L1/00 ,  H04L1/12 ,  H04L1/20 ,  H04L27/00 ,  H04L27/18 ,  H04L27/34 ,  H04W36/30 ,  H04W72/08

Abstract: A system and method to measure channel quality in terms of signal to interference plus noise ratio for the transmission of coded signals over fading channels in a communication system. A Viterbi decoder metric for the Maximum Likelihood path is used as a channel quality measure for coherent and non-coherent transmission schemes. This Euclidean distance metric is filtered in order to smooth out short term variations. The filtered or averaged metric is a reliable channel quality measure which remains consistent across different coded modulation schemes speeds. The filtered metric is mapped to the signal to interference plus noise ratio per symbol using a threshold based scheme. Use of this implicit signal to interference plus noise ratio estimat e is used for the mobile assisted handoff in a cellular system, power control and data rat e adaptation in the transmitter.

公开(公告)号：CA2341917A1

公开(公告)日：2002-06-29

申请号：CA2341917

申请日：2001-03-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHANG KIRK K ,  EJZAK RICHARD PAUL ,  LUO WEI ,  NANDA SANJIV ,  BALACHANDRAN KRISHNA

IPC: H04L12/22 ,  H04B7/26 ,  H04L27/00 ,  H04L29/02 ,  H04L29/08 ,  H04W4/00 ,  H04W28/18

Abstract: Unlike earlier methods and systems in which Radio Link Control (RLC) performance was characterized in terms of the throughput, and the size of th e higher layer Protocol Data Units (PDUs) or packets to be transferred was ignored, a method and apparatus is provided that is based on the delay of a higher layer PDU o r packet. A method and apparatus so based have less delay than a method and apparatus based on employing adaptive coding and modulation to achieve the greatest mean throughput of a data block.

公开(公告)号：DE602005004757T2

公开(公告)日：2009-02-26

申请号：DE602005004757

申请日：2005-12-15

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALACHANDRAN KRISHNA ,  KANG JOSEPH H

Abstract: In a wireless communications system which hops from frequency to frequency, rather than hopping according to a fixed dwell interval and a predetermined pseudo-random hop sequence, a quality-based frequency hopping methodology is defined in which a new frequency is hopped to when the channel quality on the current frequency degrades based on the measured value or values of one or more predetermined metrics that are associated with channel quality. When triggered to hop to a next frequency, the hop-to-frequency may be the next frequency in the pseudo-random hop sequence known to both the transmitter and receiver or, in order to improve the reliability of communications, may be determined based on channel quality measurements on different potential hop-to-frequencies.

公开(公告)号：CA2341917C

公开(公告)日：2005-01-11

申请号：CA2341917

申请日：2001-03-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： NANDA SANJIV ,  CHANG KIRK K ,  LUO WEI ,  EJZAK RICHARD PAUL ,  BALACHANDRAN KRISHNA

IPC: H04L12/22 ,  H04B7/26 ,  H04L27/00 ,  H04L29/02 ,  H04L29/08 ,  H04W4/00 ,  H04W28/18

Abstract: Unlike earlier methods and systems in which Radio Link Control (RLC) performance was characterized in terms of the throughput, and the size of th e higher layer Protocol Data Units (PDUs) or packets to be transferred was ignored, a method and apparatus is provided that is based on the delay of a higher layer PDU o r packet. A method and apparatus so based have less delay than a method and apparatus based on employing adaptive coding and modulation to achieve the greatest mean throughput of a data block.

公开(公告)号：DE69905649T2

公开(公告)日：2003-12-18

申请号：DE69905649

申请日：1999-05-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALACHANDRAN KRISHNA ,  EJZAK RICHARD PAUL ,  NANDA SANJIV ,  SETH SHIV MOHAN ,  VITEBSKIY STANISLAV ,  WAUNG WILLIAM

IPC: H04L29/08 ,  H04L1/00 ,  H04L1/18 ,  H04L29/06 ,  H04L12/28

Abstract: A system and method of implementing a radio link protocol completion oriented packet data communication system. A data backlog is described with a media access control layer controller and transmitting a BEGIN protocol data unit containing a flag transmitted to a receiver. A media access control layer transaction is initiated in response to the transmitting of the BEGIN protocol data unit.

公开(公告)号：DE69904113T2

公开(公告)日：2003-07-10

申请号：DE69904113

申请日：1999-05-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALACHANDRAN KRISHNA ,  EJZAK RICHARD PAUL ,  NANDA SANJIV ,  SETH SHIV MOHAN ,  VITEBSKIY STANISLAV ,  WAUNG WILLIAM

IPC: H04Q7/38 ,  H04L1/00 ,  H04L1/18 ,  H04L29/06 ,  H04L29/08 ,  H04L12/28

Abstract: A system and method of implementing a radio link protocol and dynamic partial echo management for a transaction oriented packet data communication system. A data backlog is described with a media access control layer controller and transmitting a BEGIN protocol data unit transmitted to a receiver. A media access control layer transaction is initiated in response to the transmitting of the BEGIN frame.