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公开(公告)号：CA2330267C
公开(公告)日：2006-03-14
申请号：CA2330267
申请日：2001-01-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MONOGIOUDIS PANTELIS , REGE KIRAN M , SAMPATH ASHWIN
Abstract: In a wireless communications system, a base station employs a bit error rate (BER) based Reverse Outer Loop Power Control (ROLPC) technique. The ROLPC techniqu e uses either instantaneous or weakly filtered values of the BER for compariso n with a BER target value for adjusting a target signal-to-noise ratio (SNR). The BER target value is varied as a function of a second order statistic (e.g. variance, standard deviation) of the received SNR. In another embodiment, a symbol error count based ROLPC technique uses adaptive SER targets. In particular, a base station uses a 2nd order statistic, e.g., standard deviation (variance), to identify, or act as a signature of, a particular cellular (wireless) communications environment. The base station monitors the standar d deviation of the symbol error count of a received signal (transmitted from a mobile station). The target signal-to-noise ratio ((E b/N0)T) of this received signal is adjusted as a function of the value of the standard deviation and the adjusted (E b/N0)T target is used to provide power control.
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公开(公告)号：BR9803199A
公开(公告)日：1999-11-03
申请号：BR9803199
申请日：1998-08-20
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：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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15.发明专利
公开(公告)号：CA2369197A1
公开(公告)日：2002-08-20
申请号：CA2369197
申请日：2002-01-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： REGE KIRAN M , MONOGIOUDIS PANTELIS
Abstract: In a UMTS (universal mobile telecommunications system) based system, a wireless receiver implements "effective signal-to-noise (E b/N o) based BER estimation." In particular, the wireless receiver comprises a rake receiver, a processor and memory. The rake receiver processes a received signal and provides signa l- to- noise ratio values for each slot of each received frame of the received signal. The processor converts these signal-to-noise ratio values for each received fram e into an effective signal-to-noise ratio value for the received signal. The processor then uses the effective signal-to-noise ratio value as a pointer, or index, into a loo k- up table (stored in the memory) and retrieves a BER estimate therefrom.
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Patent Agency Ranking
公开(公告)号：CA2328655A1
公开(公告)日：2001-09-14
申请号：CA2328655
申请日：2000-12-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： REGE KIRAN M , MONOGIOUDIS PANTELIS , KODIALAM MURALIDHARAN SAMPATH , AHMED WALID , JIANG HONG
IPC: H04B7/26 , H04B7/204 , H04L12/28 , H04L12/56 , H04W40/20 , H04W40/30 , H04W48/08 , H04W64/00 , H04W84/18
Abstract: In an ad-hoc mobile network, a geometry-based routing algorithm (GRA) is us ed to route traffic from a source node to a destination node. In the GRA, a source node maintains location information and routing information for all nodes in a local area and approximate location information for at least some nodes outside the local area. If the source node has to send a packet to a destination node outside their local area, then the source node uses the approximate location information of the destination nod e to identify which node in its local area is closer to the destination node than the sour ce node. The source node then sends the packet to the identified local node for further routing.
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公开(公告)号：DE69805250D1
公开(公告)日：2002-06-13
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：CA2329549A1
公开(公告)日：2001-09-14
申请号：CA2329549
申请日：2000-12-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： REGE KIRAN M , MONOGIOUDIS PANTELIS , JIANG HONG , AHMED WALID , KODIALAM MURALIDHARAN SAMPATH
Abstract: In an ad-hoc mobile network, a geometry-based routing protocol (GRP) is used to route traffic from a source node to a destination node. In order for GRP to be effective, the network needs to have certain routability characteristics. To that end, each node collects location information from surrounding nodes and uses the collected location information to select those surrounding nodes that facilitate geometric routing and sets up point-to-point links with the selected nodes (becoming direct neighbors). Th e node then constructs its k-neighborhood, (where the value of k represents the maximum number of hops needed to reach any node in the desired local topology) by exchanging i ts list of direct neighbor nodes with other nodes.
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公开(公告)号：CA2330267A1
公开(公告)日：2001-08-28
申请号：CA2330267
申请日：2001-01-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SAMPATH ASHWIN , MONOGIOUDIS PANTELIS , REGE KIRAN M
IPC: H04L1/00 , H04B7/005 , H04B7/26 , H04J13/00 , H04W52/12 , H04W52/20 , H04W52/22 , H04W52/24 , H04Q7/36
Abstract: In a wireless communications system, a base station employs a bit error rate (BER) based Reverse Outer Loop Power Control (ROLPC) technique. The ROLPC techniqu e uses either instantaneous or weakly filtered values of the BER for compariso n with a BER target value for adjusting a target signal-to-noise ratio (SNR). The BER target value is varied as a function of a second order statistic (e.g. variance, standard deviation) of the received SNR. In another embodiment, a symbol error count based ROLPC technique uses adaptive SER targets. In particular, a base station uses a 2"a order statistic, e.g., standard deviation (variance), to identify, or act as a signature of, a particular cellular (wireless) communications environment. The base station monitors the standar d deviation of the symbol error count of a received signal (transmitted from a mobile station). The target signal-to-noise ratio ((Eb/Na)T) of this received signal is adjusted as a function of the value of the standard deviation and the adjusted (Eb/Na)T target is used to provide power control.
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公开(公告)号：CA2245241A1
公开(公告)日：1999-02-28
申请号：CA2245241
申请日：1998-08-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KUMAR SARATH , KUO WEN-YI , REGE KIRAN M
Abstract: The present invention increases the success rate of soft handoffs by enhancing the ability of a mobile-telephone to receive a handoff direction messa ge 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 sta tion and being listened to by the mobile-telehone. In situations where signals transm itted from active set base stations have a low signal-to-noise ratio at the mobile-tel ephone, 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 m essages from the candidate base station increases the likelihood that a copy of the hand off direction message will be successfully received by the mobile-telephone, thereby enhancing the success rate of soft handoffs.
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