公开(公告)号：BR0005816A

公开(公告)日：2001-07-24

申请号：BR0005816

申请日：2000-12-08

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALACHANDRAN KRISHNA ,  NANDA SANJIV ,  SAMARAS KONSTANTINOS

IPC: H04J3/16 ,  H04B7/26 ,  H04Q7/36 ,  H04Q7/38

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：ID26673A

公开(公告)日：2001-01-25

申请号：ID990639

申请日：1999-07-01

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KUMAR SARATH ,  NANDA SANJIV ,  VITEBSKIY STANISLAV

IPC: H04B1/707 ,  H04L12/56 ,  H04W28/04 ,  H04W28/20 ,  H04W72/04 ,  H04W74/00 ,  H04W74/04 ,  H04W84/04 ,  H04Q7/38

Abstract: Bursts of additional bandwidth (e.g., one or more supplemental channels or a channel having variable bandwidth) is assigned to users (e.g., high-speed data users) in a cellular telecommunication system. A request for assignment of additional bandwidth may be an initial request, a continuation request for an on-going burst, or a retry requests after a previously rejected request. In any case, it is determined whether to grant or reject the request. If the request is rejected, instructions are given to submit a retry request after a specified back-off time. The present invention may be implemented using either an asynchronous approach or a synchronous approach. According to the asynchronous approach, all requests are handled asynchronously. According to the synchronous approach, initial requests are handled asynchronously, but continuation requests and retry requests are handled synchronously at epoch times that coincide with specific time slots.

公开(公告)号：AU3934600A

公开(公告)日：2000-12-14

申请号：AU3934600

申请日：2000-06-07

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KUMAR SARATH ,  NANDA SANJIV ,  RUBIN HARVEY ,  VITEBSKIY STANISLAV

IPC: H04B7/005 ,  H04B7/26 ,  H04W36/18 ,  H04W52/14 ,  H04W52/40 ,  H04W52/44 ,  H04W52/50 ,  H04Q7/28 ,  H04L5/16

Abstract: A back haul architecture enables efficient primary transfer (i.e., transfer of the designation of primary base station from one base station to another). A frame selection/distribution (FSD) function queues packets of forward-link data -- to which sequence numbers have been assigned --for packet-mode transmission over the back haul only to one base station -- the current primary base station -- where the packets are again queued for over-the-air transmission to the mobile unit. If and when it becomes appropriate to transfer the designation of primary base station to another base station, there may still be packets of data queued at the old primary base station awaiting transmission to the mobile unit. The old primary base station sends a message to the new primary base station indicating a particular sequence number that identifies the remaining packets of forward-link data queued at the old primary base station. The new primary base station then sends a message to the FSD function requesting transmission of those packets of forward-link data corresponding to the particular sequence number. The FSD function then transmits those requested packets of forward-link data to the new primary base station, which queues the requested packets for over-the-air transmission to the mobile unit. In this way, transmission of all of the forward-link data to the mobile unit is enabled without having to transmit the remaining queued packets of forward-link data from the old primary base station to the new primary base station over the back haul, thereby providing an efficient mechanism for primary transfer in wireless communications systems that support forward-link data transmissions only in simplex mode.

公开(公告)号：CA2348602A1

公开(公告)日：2000-05-11

申请号：CA2348602

申请日：1999-11-03

Applicant: LUCENT TECHNOLOGIES INC

Inventor： NANDA SANJIV ,  BALACHANDRAN KRISHNA ,  EJZAK RICHARD P

IPC: H04Q7/38 ,  H04L1/00 ,  H04L1/18

Abstract: A system and method is provided for communicating in a wireless communicatio n system which supports link adaptation or link adaptation and incremental redundancy. The invention provides link adaptation at multiple code rate by dividing fixed length RLC blocks into coded sub-blocks. CRC code may be appended to the RLC blocks for error detection. The sub-blocks are then grouped into transmission units for transmission. The number of sub-blocks i n each group is varied to provide multiple code rates. Headers are used to identify the transmission units being transmitted. In the case of retransmission, the transmission units may be expressly identified through extended headers. One or more of the originally transmitted sub-blocks are dropped and replaced by the extended headers in the retransmission. Accordingly, the present invention provides for a retransmission code rate which may be different from the code rate at which the transmission units we re originally transmitted.

公开(公告)号：AU4104799A

公开(公告)日：2000-02-17

申请号：AU4104799

申请日：1999-07-22

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KUMAR SARATH ,  VITEBSKIY STANISLAV ,  NANDA SANJIV

IPC: H04B1/707 ,  H04L12/56 ,  H04W28/04 ,  H04W28/20 ,  H04W72/04 ,  H04W74/00 ,  H04W74/04 ,  H04W84/04 ,  H04Q7/22

Abstract: Bursts of additional bandwidth (e.g., one or more supplemental channels or a channel having variable bandwidth) is assigned to users (e.g., high-speed data users) in a cellular telecommunication system. A request for assignment of additional bandwidth may be an initial request, a continuation request for an on-going burst, or a retry requests after a previously rejected request. In any case, it is determined whether to grant or reject the request. If the request is rejected, instructions are given to submit a retry request after a specified back-off time. The present invention may be implemented using either an asynchronous approach or a synchronous approach. According to the asynchronous approach, all requests are handled asynchronously. According to the synchronous approach, initial requests are handled asynchronously, but continuation requests and retry requests are handled synchronously at epoch times that coincide with specific time slots.

公开(公告)号：BR9902728A

公开(公告)日：2000-01-18

申请号：BR9902728

申请日：1999-07-13

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KUMAR SARATH ,  NANDA SANJIV ,  VITEBSKIY SANISLAV

IPC: H04B1/707 ,  H04L12/56 ,  H04W28/04 ,  H04W28/20 ,  H04W72/04 ,  H04W74/00 ,  H04W74/04 ,  H04W84/04 ,  H04Q7/22

Abstract: Bursts of additional bandwidth (e.g., one or more supplemental channels or a channel having variable bandwidth) is assigned to users (e.g., high-speed data users) in a cellular telecommunication system. A request for assignment of additional bandwidth may be an initial request, a continuation request for an on-going burst, or a retry requests after a previously rejected request. In any case, it is determined whether to grant or reject the request. If the request is rejected, instructions are given to submit a retry request after a specified back-off time. The present invention may be implemented using either an asynchronous approach or a synchronous approach. According to the asynchronous approach, all requests are handled asynchronously. According to the synchronous approach, initial requests are handled asynchronously, but continuation requests and retry requests are handled synchronously at epoch times that coincide with specific time slots.

公开(公告)号：CA2263060A1

公开(公告)日：1999-09-19

申请号：CA2263060

申请日：1999-02-26

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALACHANDRAN KRISHNA ,  NANDA SANJIV ,  EJZAK RICHARD PAUL ,  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 estimate is used for the mobile assisted handoff in a cellular system, power control and data rate adaptation in the transmitter.

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：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：CA2310486C

公开(公告)日：2006-01-10

申请号：CA2310486

申请日：2000-06-01

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KUMAR SARATH ,  NANDA SANJIV ,  RUBIN HARVEY ,  VITEBSKY STANLEY

IPC: H04B7/005 ,  H04B7/26 ,  H04W36/18 ,  H04W52/14 ,  H04W52/40 ,  H04W52/44 ,  H04W52/50

Abstract: A back haul architecture enables efficient primary transfer (i.e., transfer of the designation of primary base station from one base station to another). A frame selection/distribution (FSD) function queues packets of forward-link data -- to which sequence numbers ha ve been assigned -- for packet-mode transmission over the back haul only to one base station -- the current primary base station -- where the packets are again queued for over-the-air transmission to the mobile unit. If and when it becomes appropriate to transfer the designation of primary ba se station to another base station, there may still be packets of data queued at the old primary base station awaiting transmission to the mobile unit. The old primary base station sends a messag e to the new primary base station indicating a particular sequence number that identifies the remaining packets of forward-link data queued at the old primary base station. The new primary ba se station then sends a message to the FSD function requesting transmission of those packets of forward-link data corresponding to the particular sequence number. The FSD function then transmits those requested packets of forward-link data to the new primary base station, which queues t he requested packets for over-the-air transmission to the mobile unit. In this way, transmission of all of the forward-link data to the mobile unit is enabled without having to transmit the remaining queued packets of forward-link data from the old primary base station to the new primary base station over the back haul, thereby providing an efficient mechanism for primary transfer in wireless communications systems that support forward-link data transmissions only in simplex mode.