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公开(公告)号：DE60111706T2
公开(公告)日：2006-05-04
申请号：DE60111706
申请日：2001-10-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , JUNYI LI , UPPALA SATHYADEV VENKATA
Abstract: In a wireless communications system, multicast messages are transported to groups of wireless terminals by employing a common control channel to transmit a multicast paging message indicating that multicast traffic data is to be transmitted to a particular group of wireless terminals. In an embodiment of the invention, the essential information transmitted in the common control channel is the identifier of the group of wireless terminals intended to receive the multicast traffic data and the location of a traffic channel on which the multicast traffic is to be transported in a channel resource which may include a representation of bandwidth and time interval. In accordance with an aspect of the invention, the common control channel is associated with a traffic channel in a prescribed fixed manner. Further, the traffic channel used for the purpose of multicast can be the same traffic channel used for the normal point-to-point transmission of traffic data.
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公开(公告)号：CA2366347C
公开(公告)日：2006-01-24
申请号：CA2366347
申请日：2001-12-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI JUNYI , UPPALA SATHYADEV VENKATA , LAROIA RAJIV
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：CA2298360C
公开(公告)日：2005-08-16
申请号：CA2298360
申请日：2000-02-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , VANDERVEEN MICHAELA C , LI JUNYI
Abstract: In an orthogonal frequency division multiplexing (OFDM) based spread spectr um multiple access system the entire bandwidth is divided into orthogonal tones , and all of the orthogonal tones are reused in each cell. To reduce peak-to-average rati o at the mobile transmitter, each voice user is allocated preferably a single one, bu t no more than a very small number, of the orthogonal tones for use in communicating with t he base station. Data users are similarly allocated tones for data communication, however, the number of tones assigned for each particular data user is a function of the data rate for that user. The tone assignment for a given user is not always the same withi n the available band, but instead the tones assigned to each user are hopped over time. More specifically, in the downlink, the tones assigned to each user are change relatively rapidly, e.g., from symbol to symbol, i.e., the user fast "hops" from one to ne to another. However, in the uplink, preferably slow hopping is employed to allow efficie nt modulation of the uplink signal which necessitates the employing of addition al techniques, such as interleaving, to compensate for the reduction in the intercell interference averaging effect. For data communication power control is employed in the uplink and/or downlink so that the transmission rate is increased, e.g., by increasing the number of symbols transmitted per tone per unit time or the coding rate, as a function of allocated power per tone and the corresponding channel attenuation.
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公开(公告)号：CA2344844C
公开(公告)日：2005-06-07
申请号：CA2344844
申请日：2001-04-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： UPPALA SATHYADEV VENKATA , LI JUNYI , LAROIA RAJIV
Abstract: In a wireless communication system, mobile unit and base station access request and page transmissions are addressed by employing an efficient unified approach for the transmission and detection of both access requests from a mobile unit and pages from a base station. To this end, a mobile unit monitors for access requests and monitors a prescribed resource to detect if a page has been received. Upon detection of an access request, a corresponding request message is generated and transmitting substantially immediately to a base station, thereby minimizing latency in the access process. Concurrently, a base station monitors to determine if a page indication has been received and monitors a prescribed resource to determine if an access reques t message has been received. In this process, the processing of request messages takes precedence over the processing of pages. Upon detecting a received request message a request response message is generated and transmitted substantially immediately to t he mobile unit, thereby also minimizing latency in the access process.
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公开(公告)号：CA2298361C
公开(公告)日：2005-06-07
申请号：CA2298361
申请日：2000-02-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , VANDERVEEN MICHAELA C , LI JUNYI
Abstract: An orthogonal frequency division multiplexing (OFDM) based spread spectr um multiple access system using offsetting between cells, and in particular, th e use of tone offsetting and time offsetting, is disclosed. More specifically, frequencies that define the tone set of one cell is offset from the frequencies that define the tone set of at least one adjacent cell. In other words, if a first base station is using tones F1, F2 , ..., F N within a frequency band, then a second base station adjacent to the first base statio n uses tones F1+.DELTA.f, F2+.DELTA.f ..., F N+.DELTA.f within the same frequency band. Furthermore, the symbol timing of the base-station of one cell may be offset from the symbol timing of the base-station of an adjacent cell. Thus, if a first base station starts successive symbols at times T1, T2, and T3, then a second base station adjacent to the first base station starts its respective corresponding successive symbols at times T1+.DELTA.t, T2+.DELTA.t, and T3+.DELTA.t. For example, in a cellular system with hexagonally shaped cells, the tone sets of two adjacent cells are offset by 1/3 of the spacing between adjacent tones, and the symbol timings of two adjacent cells are offset by 1/3 of a symbol period. Advantageously, the intercell interference is more uniformly distributed among users in a cell.
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Patent Agency Ranking
公开(公告)号：DE60102038T2
公开(公告)日：2004-09-09
申请号：DE60102038
申请日：2001-06-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
Abstract: In a wireless communication system, mobile unit and base station access request and page transmissions are addressed by employing an efficient unified approach for the transmission and detection of both access requests from a mobile unit and pages from a base station. To this end, a mobile unit monitors for access requests and monitors a prescribed resource to detect if a page has been received. Upon detection of an access request, a corresponding request message is generated and transmitting substantially immediately to a base station, thereby minimizing latency in the access process. Concurrently, a base station monitors to determine if a page indication has been received and monitors a prescribed resource to determine if an access request message has been received. In this process, the processing of request messages takes precedence over the processing of pages. Upon detecting a received request message a request response message is generated and transmitted substantially immediately to the mobile unit, thereby also minimizing latency in the access process.
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公开(公告)号：AU775253B2
公开(公告)日：2004-07-22
申请号：AU5191201
申请日：2001-06-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
IPC: H04W24/00 , H04W28/04 , H04W68/00 , H04W72/04 , H04W74/00 , H04Q7/22 , H04Q7/26 , H04Q7/30 , H04Q7/32
Abstract: In a wireless communication system, mobile unit and base station access request and page transmissions are addressed by employing an efficient unified approach for the transmission and detection of both access requests from a mobile unit and pages from a base station. To this end, a mobile unit monitors for access requests and monitors a prescribed resource to detect if a page has been received. Upon detection of an access request, a corresponding request message is generated and transmitting substantially immediately to a base station, thereby minimizing latency in the access process. Concurrently, a base station monitors to determine if a page indication has been received and monitors a prescribed resource to determine if an access request message has been received. In this process, the processing of request messages takes precedence over the processing of pages. Upon detecting a received request message a request response message is generated and transmitted substantially immediately to the mobile unit, thereby also minimizing latency in the access process.
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公开(公告)号：DE60102038D1
公开(公告)日：2004-03-25
申请号：DE60102038
申请日：2001-06-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
Abstract: In a wireless communication system, mobile unit and base station access request and page transmissions are addressed by employing an efficient unified approach for the transmission and detection of both access requests from a mobile unit and pages from a base station. To this end, a mobile unit monitors for access requests and monitors a prescribed resource to detect if a page has been received. Upon detection of an access request, a corresponding request message is generated and transmitting substantially immediately to a base station, thereby minimizing latency in the access process. Concurrently, a base station monitors to determine if a page indication has been received and monitors a prescribed resource to determine if an access request message has been received. In this process, the processing of request messages takes precedence over the processing of pages. Upon detecting a received request message a request response message is generated and transmitted substantially immediately to the mobile unit, thereby also minimizing latency in the access process.
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公开(公告)号：DE60101544D1
公开(公告)日：2004-01-29
申请号：DE60101544
申请日：2001-08-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
Abstract: In a unique paging time slot format, each of the allocated paging time slots occurs periodically and is split into several prescribed paging time slots including at least one first type paging time slot having a relatively short duration and at least one second type paging time slot having a longer duration. The at least one first type paging time slots is of relatively short duration and transports an indication whether a particular associated wireless terminal was paged. The second type paging time slot is of longer duration than the first type time slot and transports the entire paging message. Specifically, a wireless terminal that is normally in a standby mode only has to enter a monitor mode, i.e., "wake up", to monitor the relatively short first type paging time slot to determine whether it has been paged (502). If it has been paged, the wireless terminal then monitors the longer second type paging time slot to determine if it is transporting a valid paging message for the paged wireless terminal (503). If no valid paged indication is detected in the first type paging time slot or no valid paging message is detected in the second type paging time slot, the wireless terminal returns to the standby mode, i.e., returns to a "sleep" state, and waits for the next periodic occurrence of its assigned paging time slot (503).
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公开(公告)号：CA2271508C
公开(公告)日：2002-12-10
申请号：CA2271508
申请日：1999-05-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WANG JIN-DER , LAROIA RAJIV
Abstract: In an Asymmetric Digital Subscriber Loop (ADSL) Discrete Multi-Tone (DM T) system, ADSL DMT equipment includes an encoder that operates on a DMT input signal representing f symbols/sec. to generate, for transmission, a DMT output sign al representing Nf symbols/sec., where N > l, and where each symbol from the DMT input signal is generated in a redundant form in the DMT output signal. In one example of a redundant form, each symbol from the DMT input signal is repeated in N consecutive symbol intervals in the DMT output signal. In another example of a redundant form, every N DMT input symbol values are transmitted in 2N consecutive symbol intervals in the DMT output signal. These 2N consecutive symbols in the DMT output signal include 1) N symbols whose values equal the respective N DMT input symbol values and 2) N symbols whose values are a function of the respective N DMT input symbol values.
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