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62 records (took 0.024 seconds)

    42.
    发明专利
    未知

    公开(公告)号：BR9915302A

    公开(公告)日：2001-07-24

    申请号：BR9915302

    申请日：1999-03-16

    Applicant: LUCENT TECHNOLOGIES INC

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

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

    44.
    发明专利
    未知

    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.

    SYSTEM AND METHOD FOR WIRELESS COMMUNICATION SUPPORTING LINKADAPTATION AND INCREMENTAL REDUNDANCY
    45.
    发明专利
    SYSTEM AND METHOD FOR WIRELESS COMMUNICATION SUPPORTING LINKADAPTATION AND INCREMENTAL REDUNDANCY 未知

    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.

    48.
    发明专利
    未知

    公开(公告)号：DE602004008181D1

    公开(公告)日：2007-09-27

    申请号：DE602004008181

    申请日：2004-09-29

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BALACHANDRAN KRISHNA ,  BUDKA KENNETH C ,  DAS ARNAB ,  KANG JOSEPH H

    IPC: H04W60/04 ,  H04B7/26 ,  H04L12/56

    Abstract: A method of triggering registration of a mobile station in a network supporting broadcast multicast services employs registration triggers based on flow conditions and frequency conditions. For example, a registration message may be generated based on a change in frequency, from a first frequency to a second frequency, that is monitored by the mobile station. If the second frequency is not known to the network based on flow identifier information previously registered by the mobile station with the network, a registration to the network is triggered. By sending a registration, the network may page a mobile station on a single, given frequency, since the registration message indicates the mobile station's presence on that given frequency.

    50.
    发明专利
    未知

    公开(公告)号：DE602004001083D1

    公开(公告)日：2006-07-20

    申请号：DE602004001083

    申请日：2004-03-30

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BALACHANDRAN KRISHNA ,  BUDKA KENNETH C ,  DAS ARNAB ,  MEDAPALLI KAMESWARA RAO ,  PARULEKAR MINOTHI

    IPC: H04J3/16 ,  H04L12/56 ,  H04L12/28 ,  H04W28/24 ,  H04W72/12

    Abstract: A method for scheduling transmissions to a plurality of users in a communication network determines a satisfaction metric and a dissatisfaction metric for each user in a given timeslot that is to be used for a next scheduled transmission to one of the users. Each user is assigned a weight based on a value of at least one of the user's satisfaction metric, the user's dissatisfaction metric and a rate requested by the user. The use having the highest weight is selected to be served the next scheduled transmission in the given timeslot.

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