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公开(公告)号：BR0003063A
公开(公告)日：2001-02-06
申请号：BR0003063
申请日：2000-05-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KNISELY DOUGLAS N , NANDA SANJIV , KUMAR SARATH , KHAN FAROOQ ULLAH , MEDAPALLI KAMESWARA RAO
Abstract: A variable length sequence number is used to identify data units in a communication channel. The sequence number associated with the most recent data that has been received successfully and the sequence number expected with the next new data message to be received are examined to determine the minimum size sequence number necessary to unambiguously identify to the transmitter incorrectly received data that must be retransmitted in a later message. The receiver provides the transmitter with the sequence number associated with the last successfully received byte of data and the sequence number associated with the next expected byte of data. The receiver communicates this information to the transmitter using a NAK control message. The transmitter then uses the sequence number of the next byte of data to be transmitted and the information received in the control message from the receiver to determine the smallest number of bits necessary to represent the sequence numbers for both data transmissions and the retransmission of data that was not received properly by the receiver.
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公开(公告)号：AU3024700A
公开(公告)日：2000-11-16
申请号：AU3024700
申请日：2000-05-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KHAN FAROOQ ULLAH , KNISELY DOUGLAS N , KUMAR SARATH , MEDAPALLI KAMESWARA RAO , NANDA SANJIV
Abstract: A variable length sequence number is used to identify data units in a communication channel. The sequence number associated with the most recent data that has been received successfully and the sequence number expected with the next new data message to be received are examined to determine the minimum size sequence number necessary to unambiguously identify to the transmitter incorrectly received data that must be retransmitted in a later message. The receiver provides the transmitter with the sequence number associated with the last successfully received byte of data and the sequence number associated with the next expected byte of data. The receiver communicates this information to the transmitter using a NAK control message. The transmitter then uses the sequence number of the next byte of data to be transmitted and the information received in the control message from the receiver to determine the smallest number of bits necessary to represent the sequence numbers for both data transmissions and the retransmission of data that was not received properly by the receiver.
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公开(公告)号：CA2307485A1
公开(公告)日：2000-11-14
申请号：CA2307485
申请日：2000-05-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KNISELY DOUGLAS N , KHAN FAROOQ ULLAH , MEDAPALLI KAMESWARA RAO , KUMAR SARATH , NANDA SANJIV
Abstract: A variable length sequence number is used to identify data units in a communication channel. The sequence number associated with the most recent data that has been received successfully and the sequence number expected with the next new data message to be received are examined to determine the minimum size sequence number necessary to unambiguously identify to the transmitter incorrectly received data that must be retransmitted in a later message. The receiver provides the transmitter with the sequence number associated with the last successfully received byte of data and the sequence number associated with the next expected byte of data. The receiver communicates this information to the transmitter using a NAK control message. The transmitter then uses the sequence number of the next byte of data to be transmitted and the information received in the control message from the receiver to determine the smallest number of bits necessary to represent the sequence numbers for both data transmissions and the retransmission of data that was not received properly by the receiver.
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公开(公告)号：DE69805250T2
公开(公告)日：2002-11-07
申请号：DE69805250
申请日：1998-08-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KUMAR SARATH , REGE KIRAN M , KUO WEN-YI
Abstract: The present invention increases the success rate of soft handoffs by enhancing the ability of a mobile-telephone to receive a handoff direction message that identifies the traffic channel being assigned to enable a candidate base station to communicate with the mobile-telephone. Specifically, the aforementioned ability of the mobile-telephone is enhanced by using the candidate base station to transmit the handoff direction message on a communication channel belonging to the candidate base station and being listened to by the mobile-telephone. In situations where signals transmitted from active set base stations have a low signal-to-noise ratio at the mobile-telephone, signals transmitted from the candidate base station may have a higher signal-to-noise ratio at the mobile-telephone. In these situations, the transmission of the HD messages from the candidate base station increases the likelihood that a copy of the handoff direction message will be successfully received by the mobile-telephone, thereby enhancing the success rate of soft handoffs.
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公开(公告)号：CA2245241C
公开(公告)日：2002-10-15
申请号：CA2245241
申请日：1998-08-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KUMAR SARATH , REGE KIRAN M , KUO WEN-YI
Abstract: The present invention increases the success rate of soft handoffs by enhancing the ability of a mobile-telephone to receive a handoff direction m essage that identifies the traffic channel being assigned to enable a candidate base sta tion to communicate with the mobile-telephone. Specifically, the aforementioned abil ity of the mobile-telephone is enhanced by using the candidate base station to transmit the handoff direction message on a communication channel belonging to the candidate base station and being listened to by the mobile-telehone. In situations where signals tr ansmitted from active set base stations have a low signal-to-noise ratio at the mobile -telephone, signals transmitted from the candidate base station may have a higher signal -to-noise ratio at the mobile-telephone. In these situations, the transmission of the HD messages from the candidate base station increases the likelihood that a copy of the handoff direction message will be successfully received by the mobile-telephone, the rebyenhancing the success rate of soft handoffs.
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Patent Agency Ranking
公开(公告)号：AU3795100A
公开(公告)日：2000-12-14
申请号：AU3795100
申请日：2000-06-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KUMAR SARATH , LI QUINN , WU XIAO CHENG
Abstract: In a wireless communications system, a base station transmits power control signals (e.g., the power control bits of a power control sub-channel) to a mobile using a forward-link channel that is decoupled from all other signals transmitted from that base station to that mobile. For example, the decoupled forward-link channel may be a common power control channel. The mobile then uses the power control signals received in the decoupled forward-link channel to control its power level for transmitting one or more reverse-link channels to the base station. The ability of base stations to use decoupled forward-link channels in order to transmit their power control signals to a mobile enables a mobile to operate with different active sets for the forward and reverse links. This enables forward-link data traffic to be implemented using a simplex mode, even when the mobile is operating in soft handoff in the reverse link. This in turn greatly reduces the reactivation time involved in transitioning a mobile from the suspended state to the active state, which is particularly desirable for bursty (i.e., intermittent) packet data flow, as opposed to continuous circuit-oriented voice messaging.
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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
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.
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公开(公告)号：CA2310428A1
公开(公告)日：2000-12-11
申请号：CA2310428
申请日：2000-06-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI QUINN , WU XIAO CHENG , KUMAR SARATH
Abstract: In a wireless communications system, a base station transmits power control signals (e.g., the power control bits of a power control sub-channel) to a mobile using a forward-link channel that is decoupled from all other signals transmitted from that base station to that mobile. For example, the decoupled forward-link channel may be a common power control channel. The mobile then uses the power control signals received in the decoupled forwardlink channel to control its power level for transmitting one or more reverse-link channels to the base station. The ability of base stations to use decoupled forward-link channels in order to transmit their power control signals to a mobile enables a mobile to operate with different active sets for the forward and reverse links. This enables forward-link data traffic to be implemented using a simplex mode, even when the mobile is operating in soft handoff in the reverse link. This in turn greatly reduces the reactivation time involved in transitioning a mobile from the suspended state to the active state, which is particularly desirable for bursty (i.e., intermittent) packet data flow, as opposed to continuous circuit-oriented voice messaging.
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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
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.
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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.
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