公开(公告)号：CA2311270A1

公开(公告)日：2000-12-11

申请号：CA2311270

申请日：2000-06-09

Applicant: LUCENT TECHNOLOGIES INC

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

IPC: H04B7/005 ,  H04B7/26 ,  H04W36/18 ,  H04W52/12 ,  H04W52/54 ,  H04Q7/36

Abstract: A back haul architecture effectively reduces the reactivation times for both forward-link and reverse-link data transmissions over CDMA wireless communications systems, by relying on packet-mode transmissions over the back haul between a frame selection/distribution (FSD) function and the appropriate base stations for both forward-link data and reverse-link data. In particular, for the forward direction, the FSD function transmits forward-link data only to one base station (i.e., the primary base station), which is solely responsible for controlling the forward-link air interface with the corresponding mobile unit. As such, the forward link always operates in simplex mode for data transmissions, independent of how many base stations are operating in soft handoff for the reverse link with the same mobile unit. For the reverse direction, each base station that receives frames of reverse-link data from the mobile unit, assigns a time tag to the frame, divides the frame into one or more data packets, assigns a different sequence number to each data packet, and transmits the data packets to the FSD function over the back haul, all without first synchronizing time with any other base station that is also operating in reverse-link soft hand-off with that mobile unit. The FSD function (or preferably the radio link protocol (RLP) function) is then responsible for selecting packets of reverse-link data for subsequent processing (e.g., transmission to the network end of the connection). By limiting forward-link data transmissions to simplex mode and using packet-mode transmissions for reverse-link data, the need to first synchronize timing between the various base stations is eliminated for both forward-link and reverse-link data transmissions. As a result, reactivation delays are greatly reduced.

公开(公告)号：CA2308983A1

公开(公告)日：2000-11-25

申请号：CA2308983

申请日：2000-05-16

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CLOUTIER JOSEPH E ,  KNISELY DOUGLAS N ,  KUMAR SARATH ,  NANDA SANJIV

IPC: H04B7/005 ,  H04L1/00 ,  H04L1/16 ,  H04L1/18 ,  H04L29/02

Abstract: A method for improving the throughput of a communication system by decreasing the amount of time it takes to retransmit information determined to have been erroneous. Information received by an equipment is decoded and subjected to error detection techniques. The equipment performs a data puncture operation on the received information it is currently transmitting to request a retransmission of such received information.

公开(公告)号：CA2286466C

公开(公告)日：2000-10-10

申请号：CA2286466

申请日：1997-03-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DRAVIDA SUBRAHMANYAM ,  EJZAK RICHARD PAUL ,  TREVENTI PHILIP ANDREW ,  NANDA SANJIV ,  SAWKAR ANIL S ,  DOSHI BHARAT TARACHAND

IPC: H04W84/02 ,  H04J3/00 ,  H04M3/00 ,  H04Q3/00 ,  H04Q11/04 ,  H04W88/18 ,  H04L12/56 ,  H04Q7/22

Abstract: The present invention relates to a cellular communication system that is comprised of a plurality of radio ports that communicate over an air interface with a plurality of terminal devices, where the radio ports have asynchronous transfer mode (ATM) interfaces. A cellular switch is provided having circuit-switching fabric connected to a public switched telephone network (PSTN). A digital cellular switch (DCS) is provided which has ATM fabric, radio link protocol processors, and vocoders, where the vocoders are connected to the PSTN, and where the ATM fabric is connected to the radio ports by ATM virtual links. One or more standard hardware platforms implement ATM transport that perform a plurality of call control functions including the handling of voice and data calls from/to the radio ports. A network interworking module interfaces the DCS to a communications network. A voice call is set-up by the plurality of functions implemented on the standard hardware platforms, so that a voice communication path is established from the terminal device to the PSTN, which includes the air interface and one or more of the radio ports and ATM virtual links, the ATM fabric, and one of the vocoders. A data call is set-up by the plurality of functions implemented on the standard hardware platforms, so that a data communication path is established from the terminal device to the communications network, which includes the air interface and one or more of the radio ports and ATM virtual links, the ATM fabric, one of said radio protocol processors, and the network interworking module.

公开(公告)号：CA2273293A1

公开(公告)日：2000-01-23

申请号：CA2273293

申请日：1999-05-31

Applicant: LUCENT TECHNOLOGIES INC

Inventor： VITEBSKIY STANISLAV ,  NANDA SANJIV ,  KUMAR SARATH

IPC: H04B1/707 ,  H04L12/56 ,  H04W28/04 ,  H04W28/20 ,  H04W72/04 ,  H04W74/00 ,  H04W74/04 ,  H04W84/04 ,  H04Q7/36

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：AU2121799A

公开(公告)日：1999-09-30

申请号：AU2121799

申请日：1999-03-16

Applicant: LUCENT TECHNOLOGIES INC

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

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 ,  H04Q7/34

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 hand off in a cellular system, power control and data rate adaptation in the transmitter.

公开(公告)号：CA2254483A1

公开(公告)日：1999-06-15

申请号：CA2254483

申请日：1998-11-24

Applicant: LUCENT TECHNOLOGIES INC

Inventor： NANDA SANJIV ,  KUO WEN-YI ,  MEYERS MARTIN HOWARD ,  KNISELY DOUGLAS N

IPC: H04B1/04 ,  H04J11/00 ,  H04Q7/36 ,  H04B7/005 ,  H04Q7/22

Abstract: An apparatus for reducing power amplifier headroom in a wireless transmission system comprises an orthogonal modulation circuit and a phase rotation circuit c oupled to the orthogonal modulation circuit. The orthogonal modulation circuit utilizes a Walsh code for modulating an in-phase signal and a quadrature signal. The orthogonal modulation circuit has an in-phase output and a quadrature output. The phase rot ation circuit rotates phase of the in-phase signal the quadrature signal, producing a phase rotated in-phase signal abd a phase rotated quadrature signal. Multiple Walsh co de defined channels are associated with a particular wireless user.

公开(公告)号：CA2232320A1

公开(公告)日：1998-10-14

申请号：CA2232320

申请日：1998-03-17

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALDWIN JOHN HENRY ,  DOSHI BHARAT TARACHAND ,  DRAVIDA SUBRAHMANYAM ,  MATRAGI WASSIM A ,  JIANG HONG ,  NANDA SANJIV

IPC: H04Q3/00 ,  H04L12/56 ,  H04Q7/38 ,  H04Q11/04

Abstract: A digital cellular/personal communications service (PCS) application incorporate s a logical link connection (LLC) server. In this approach, there are two ATM conn ections in the path of an AAL-2 connection: one between a base station and the LLC Serve r and the other between the LLC Server and a vocoder group. All LLCs from, or to, a gi ven base station use a common ATM connection irrespective of the vocoder used at the other end. Similarly, all LLCs from, or to, a given vocoder group use a common ATM connection irrespective of the destination base station at the other end. At the LLC Server, LLC packets from many base stations destined for the same vocoder group are extracted and bundled into the ATM connection between the LLC Server and the destination vocoder group. Similar treatment is given to the packets originating at vocoders and destined for base stations. Thus, each ATM connection between a particular base station and the LLC server and each ATM connection between the L LC Server and a particular vocoder group are used to maximum capacity notwithstandi ng each ATM connection conveys LLCs to different LLC endpoints.

公开(公告)号：DE60129658D1

公开(公告)日：2007-09-13

申请号：DE60129658

申请日：2001-06-11

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DAS ARNAB ,  KHAN FAROOQ ULLAH ,  NANDA SANJIV

IPC: H04J3/00 ,  H04L1/00 ,  H04B7/26 ,  H04L1/08 ,  H04L1/18 ,  H04L12/56

Abstract: Disclosed is a method of sub-packet adaptation based on data rate. Specifically, the size of a sub-packet is adapted to a data rate at which the sub-packet is to be transmitted. In one embodiment, the sub-packet is size adapted to the data rate in a format that would allow such size adapted sub-packet to be soft combined with another sub-packet of a same or different size. The size adapted sub-packet may be transmitted prior to or after the other sub-packet.

公开(公告)号：DE69834783T2

公开(公告)日：2007-05-16

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：DE69931107T2

公开(公告)日：2007-02-01

申请号：DE69931107

申请日：1999-07-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KUMAR SARATH ,  NANDA SANJIV ,  VITEBSKY STANLEY

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

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.