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公开(公告)号：DE60130820T2
公开(公告)日：2008-08-07
申请号：DE60130820
申请日：2001-01-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , RANGAN SUNDEEP , UPPALA SATHYADEV VENKATA
Abstract: An uplink synchronization and access control system is provided, in which mobile stations transmit certain timing and access signals in dedicated intervals in an uplink stream. Access control is illustratively implemented as a two-stage process, in which a given mobile first transmits a generic uplink access signal, in one of the intervals. If this access is accepted, the base station transmits an access acknowledgment, which contains initial timing and power corrections, along with initial channel assignments, on which the mobile can initiate a call set-up process. For re-synchronization, mobiles transmit timing synchronization signals in the dedicated timing and access intervals. The base station measures the arrival time of the signals, and sends back appropriate timing corrections. The invention thereby ensures that orthogonality between mobiles is maintained.
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22.发明专利
公开(公告)号：ES2242712T3
公开(公告)日：2005-11-16
申请号：ES01308987
申请日：2001-10-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , JUNYI LI , UPPALA SATHYADEV VENKATA
Abstract: Aparato para una estación base (101) de un sistema de comunicaciones inalámbricas de acceso múltiple que incluye al menos una estación base (101) y una pluralidad de terminales inalámbricos (103) para transmitir datos de tráfico multidifusión por un canal de recurso definido por su ancho de banda y su intervalo de tiempo, incluyendo dicho canal de recurso un canal (202, 302, o 502) de tráfico y un canal (201, 301, 501) de asignación, estando dicho canal (202, 302, 502)de tráfico compuesto por una pluralidad de segmentos (402, 403, 504-1, 504-2, ...) de tráfico, estando cada uno de dichos segmentos de tráfico seleccionado a partir de un primer conjunto de formas de onda de señal predeterminadas en un intervalo de tiempo predeterminado (Figuras 4 y 5), y estando dicho canal (201, 301, 501) de asignación compuesto por una pluralidad de segmentos (401, 503-1, 503-2, ...) de asignación, estando cada uno de dichos segmentos de asignación seleccionado a partir de un segundo conjunto de formas de onda de señal predeterminadas en un intervalo de tiempo predeterminado (Figuras 4 y 5), y medios transmisores (105) adaptados para transmitir datos multidifusión o datos punto a punto.
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23.发明专利
公开(公告)号：CA2351971C
公开(公告)日：2005-11-01
申请号：CA2351971
申请日：2001-06-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI JUNYI , UPPALA SATHYADEV VENKATA , LAROIA RAJIV
Abstract: Uplink traffic channel allocation is realized by utilizing a dedicated contr ol channel in which a prescribed portion of the control channel resource, for example, frequency, time slot or the like, is reserved for transporting the uplink traffic channel requests. Both the base station and the particular mobile unit know the prescribed portion of the control channel resource a priori. Consequently, when the particular mobile unit transmits an uplink traffic channel request via the prescribed portion of the control channel resource there is no need for adding any control header information, thereby minimizing overhead. Furthermore, the length of the uplink traffic channel requests can be optimally chosen without constraints imposed by other contro l message schemes. Reduced overhead coupled with the prescribed portion of the control channel resource arriving quite frequently reduces latency in the particular mobile unit acquiring an uplink traffic channel. In one example, delivery of adequate uplink traffic channel request information to the base station, while minimizing the adverse impact of losing requests, is ensured by persistently transmitting t he requests. Specifically, after the mobile unit transmits a first request, it transmits a second or even a third request instead of waiting to receive a response message from t he base station and/or waiting for a timer to time out. By the mobile unit using suc h a persistent request transmission scheme, the base station can readily determi ne the true value of the received request by eliminating the transmission loop delay effect, thereby allowing a sensible assignment decision to be made.
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公开(公告)号：CA2344839C
公开(公告)日：2005-06-07
申请号：CA2344839
申请日：2001-04-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
Abstract: Access request transmissions are effected in a wireless communications syst em by assigning each mobile unit a unique dedicated uplink resource. Specifically, each mobile unit is assigned channel segments with distinct time slot indices and/or waveform indices, where waveforms with distinct indices are orthogonal. A ba se station can identify the mobile that has made an access request from the dedicated uplink resource. Therefore, no mobile identification number is needed in the uplink request message. Then, the base station can transmit a request response message on a shared downlink resource that may include the identification number of the requesting mobile unit to acknowledge reception of the request. The mobile unit may transmit on a shared uplink resource an acknowledgment of reception of the downlink reques t response message.
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公开(公告)号：AU774935B2
公开(公告)日：2004-07-15
申请号：AU5192301
申请日：2001-06-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
Abstract: Access request transmissions are effected in a wireless communications system by assigning each mobile unit a unique dedicated uplink resource. Specifically, each mobile unit is assigned channel segments with distinct time slot indices and/or waveform indices, where waveforms with distinct indices are orthogonal. A base station can identify the mobile that has made an access request from the dedicated uplink resource. Therefore, no mobile identification number is needed in the uplink request message. Then, the base station can transmit a request response message on a shared downlink resource that may include the identification number of the requesting mobile unit to acknowledge reception of the request. The mobile unit may transmit on a shared uplink resource an acknowledgment of reception of the downlink request response message.
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Patent Agency Ranking
公开(公告)号：CA2366347A1
公开(公告)日：2002-07-08
申请号：CA2366347
申请日：2001-12-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： UPPALA SATHYADEV VENKATA , LAROIA RAJIV , LI JUNYI
Abstract: Latency in receiving and detecting paging messages at a wireless termin al is reduced by employing a unique "super" paging time slot format. A paging super time slot includes a plurality of prescribed time slots. Each wireless terminal is associated with cyclically recurring super time slots. A super slot is associated with one or more wireless terminals. A base station always select s the first available time slot in a super time slot to transmit a paging message to a wireless terminal that is associated with the super time slot. Each wireless terminal monitors every time slot in the associated super time slot until either detecting reception of its associated paging message or detecting an empty time slot. In another embodiment of the invention, a unique partially overlapping super time slot format is employed in which a super time slot has at least o ne time slot common to its adjacent super time slots. This allows wireless terminals associated with adjacent super time slots to share the common at least one time slot. In turn, this results in balanced traffic loads, smoothed traffic fluctuation and reduced congestion.
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公开(公告)号：BR0102332A
公开(公告)日：2002-04-23
申请号：BR0102332
申请日：2001-06-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , UPPALA SATHYADEV VENKATA , LI JUNYI
Abstract: Access request transmissions are effected in a wireless communications system by assigning each mobile unit a unique dedicated uplink resource. Specifically, each mobile unit is assigned channel segments with distinct time slot indices and/or waveform indices, where waveforms with distinct indices are orthogonal. A base station can identify the mobile that has made an access request from the dedicated uplink resource. Therefore, no mobile identification number is needed in the uplink request message. Then, the base station can transmit a request response message on a shared downlink resource that may include the identification number of the requesting mobile unit to acknowledge reception of the request. The mobile unit may transmit on a shared uplink resource an acknowledgment of reception of the downlink request response message.
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公开(公告)号：BR0103286A
公开(公告)日：2002-03-26
申请号：BR0103286
申请日：2001-08-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , UPPALA SATHYADEV VENKATA , LI JUNYI
Abstract: Uplink traffic channel allocation is realized by utilizing a dedicated control channel in which a prescribed portion of the control channel resource, for example, frequency, time slot or the like, is reserved for transporting the uplink traffic channel requests. Both the base station and the particular mobile unit know the prescribed portion of the control channel resource a priori. Consequently, when the particular mobile unit transmits an uplink traffic channel request via the prescribed portion of the control channel resource there is no need for adding any control header information, thereby minimizing overhead. Furthermore, the length of the uplink traffic channel requests can be optimally chosen without constraints imposed by other control message schemes. Reduced overhead coupled with the prescribed portion of the control channel resource arriving quite frequently reduces latency in the particular mobile unit acquiring an uplink traffic channel. In one example, delivery of adequate uplink traffic channel request information to the base station, while minimizing the adverse impact of losing requests, is ensured by persistently transmitting the requests. Specifically, after the mobile unit transmits a first request, it transmits a second or even a third request instead of waiting to receive a response message from the base station and/or waiting for a timer to time out. By the mobile unit using such a persistent request transmission scheme, the base station can readily determine the true value of the received request by eliminating the transmission loop delay effect, thereby allowing a sensible assignment decision to be made.
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29.发明专利
公开(公告)号：AU3517701A
公开(公告)日：2001-10-25
申请号：AU3517701
申请日：2001-04-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , UPPALA SATHYADEV VENKATA , LI JUNYI
IPC: H04J11/00 , H04B1/7143 , H04B1/7156 , H04B1/76 , H04B7/26 , H04L5/02 , H04L27/26 , H04Q7/20 , H04B1/713 , H04B7/216 , H04J13/06 , H04Q7/30
Abstract: Base station identification and downlink synchronization are realized by employing pilots including known symbols transmitted at prescribed frequency tones in individual ones of prescribed time intervals. Specifically, the symbols used in the pilots are uniquely located in a time- frequency grid, where the locations are specified by periodic pilot tone hopping sequences. In a specific embodiment of the invention, a period of a pilot tone hopping sequence is constructed by starting with a Latin-square based hopping sequence, truncating it over time, and possibly offsetting and permuting it over frequency. Particular examples of pilot tone hopping sequences are parallel slope hopping sequences in which the periodicity of the sequences is chosen to be a prime number of symbol time intervals. In another embodiment of the invention, a notion of phantom pilots is employed to facilitate use of various system parameters while accommodating the above noted pilot tone hopping sequences. That is, based on system considerations the frequency range of the above generated pilot tone hopping sequences exceeds the available bandwidth of a particular system, which would be a problem. This problem is overcome by truncating the pilot tone hopping sequences whenever the tone frequency exceeds the bandwidth, that is, designating these tones as phantom pilot tones and not transmitting them.
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30.发明专利
公开(公告)号：CA2339515A1
公开(公告)日：2001-10-18
申请号：CA2339515
申请日：2001-03-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： UPPALA SATHYADEV VENKATA , LI JUNYI , LAROIA RAJIV
IPC: H04J11/00 , H04B1/7143 , H04B1/7156 , H04B1/76 , H04B7/26 , H04L5/02 , H04L27/26 , H04B1/713 , H04B7/208
Abstract: Base station identification and downlink synchronization are realized b y employing pilots including known symbols transmitted at prescribed frequency tones in individual ones of prescribed time intervals. Specifically, the symbols used in the pilots are uniquely located in a time- frequency grid, where the locations are specified by periodic pilot tone hopping sequences. In a specific embodiment of the invention, a period of a pilot tone hopping sequence is constructed by starting with a Latin-square based hopping sequence, truncating it over time, and possibly offsetting and permuting it over frequency. Particular examples of pilot tone hopping sequences are parallel slope hopping sequences in which the periodicity of the sequences is chosen to be a prime number of symbol time intervals. In another embodiment of the invention, a notion of phantom pilots is employed to facilitate use of various system parameters while accommodating the above noted pilot tone hopping sequences. That is, based o n system considerations the frequency range of the above generated pilot tone hopping sequences exceeds the available bandwidth of a particular system, which would be a problem. This problem is overcome by truncating the pilot tone hopping sequences whenever the tone frequency exceeds the bandwidth,that is, designating these tones as phantom pilot tones and not transmitting them.
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