-
公开(公告)号：DE60028179T2
公开(公告)日：2007-03-15
申请号：DE60028179
申请日：2000-03-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BHATOOLAUL DAVID LAHIRI , CAO QIANG , CHARRIERE PATRICK , LIM SEAU SIAN
IPC: H04B7/00 , H04J13/00 , H04B7/26 , H04J3/00 , H04M3/00 , H04W36/08 , H04W52/00 , H04W52/04 , H04W74/08
Abstract: When a mobile is switched on in a cellular system, it first searches for the best cell that it can connect to and then attempts to send a message to the best cell found. In CDMA cellular systems, the likelihood of a mobile's RACH message being successfully received by a cell is largely dependent on its transmit power. Unfortunately having all mobiles transmit at the maximum power possible is in many circumstances not only unnecessary but also unacceptable due to the resultant intra-cell interference generated. A cellular mobile telephone network is disclosed in which a mobile station requests service in data modulated on a common random access channel (RACH) in a format associated with first a cell in which the mobile station is located. Base stations in cells neighbouring the first cell, are configured to demodulate the RACH message burst having the format associated with the first cell, and to pass the demodulated data to a radio network controller (RNC). This enables the average power required for a successful RACH transmission to be reduced.
-
公开(公告)号：AT332616T
公开(公告)日：2006-07-15
申请号：AT02257151
申请日：2002-10-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAO QIANG , CHARRIERE PATRICK , LIM SEAU SIAN , SAPIANO PHILIP
Abstract: The method involves providing a network node (14) of a data frame from a mobile user terminal (20). For each cell (18,22) delay due to transfer of representation of the received data frame across interfaces between the nodes along a transfer path to node (14) is estimated by determining contribution to the delay caused by each interface along transfer path. Cells (18, 22) are selected dependent upon the associated delays. An independent claim is also included for a network for mobile telecommunication.
-
公开(公告)号：DE60207981D1
公开(公告)日：2006-01-19
申请号：DE60207981
申请日：2002-04-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAO QIANG , CHARRIERE PATRICK , LIM SEAU SIAN
Abstract: A method is provided of informing mobile user terminals (12) camped on a cell of a base station (8) of a radio telecommunications network that a service is unavailable, such that a mobile user terminal (12) desirous of said service is handed over to another cell which provides said service. The method comprises informing the terminals (12) that selectably at least one of circuit-switched services (4) and packet-switched services (6) are unavailable.
-
公开(公告)号：DE69928836D1
公开(公告)日：2006-01-12
申请号：DE69928836
申请日：1999-12-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BHATOOLAUL LAHIRI , LIM SIAN , CAO QIANG
Abstract: In a UMTS, the AICH is arranged to send, in addition to a signal acknowledging that a preamble from a mobile is at an acceptable strength, an additional signal indicating that the mobile is not currently permitted to send its message; this may apply when the BTS does not have hardware resources available. If the BTS can predict when the hardware will become available, the additional signal can include a time out (T) after which the mobile system can send its message signal.
-
公开(公告)号：DE69829537D1
公开(公告)日：2005-05-04
申请号：DE69829537
申请日：1998-10-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAO QIANG , FREIBERG LORENZ FRED , READER DAVID JONATHAN
-
Patent Agency Ranking
公开(公告)号：GB2369008B
公开(公告)日：2002-09-11
申请号：GB0027688
申请日：2000-11-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BHATOOLAUL DAVID LAHIRI , CAO QIANG , CHARRIERE PATRICK , LIM SEAU SIAN
Abstract: Battery operated user equipment is disclosed for use in a radio telecommunications network, including means for monitoring the state of charge of the battery and means for communicating state of charge data to a base station during call set up.
-
公开(公告)号：CA2323645A1
公开(公告)日：2001-05-23
申请号：CA2323645
申请日：2000-10-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BHATOOLAUL DAVID LAHIRI , CHARRIERE PATRICK , CAO QIANG , LIM SEAU SIAN
Abstract: In a data packet, e.g. a PDU of the UMTS, a length indicator field (16) of variable granularity is created, depending on the exact length of the payload to be transmitted. An additional field (14) is provided, a single bit in length, to indicate the granularity of the length indicator field. This increases the resolution of the header, whilst keeping low an overhead of extra field bits. The method of the invention comprises: a. assessing (32, 34) the length of the data to determine the appropriate units, from a plurality of possible units, in which the length should be expressed; b. setting (36, 40) a granularity field to define said appropriate units in which the length of the data is to be indicated; and c. setting (38, 42) the length indicator field to indicate the data length.
-
-
-
公开(公告)号：BR9904390A
公开(公告)日：2000-09-05
申请号：BR9904390
申请日：1999-10-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAO QIANG , LIN JIE , FREIBERG LORENZ FRED , LIM SEAU SIAN , READER DAVID JONATHAN , STANTON JAMES LESLIE
Abstract: There is disclosed a method of transmitting data in a code division multiple access system, comprising the steps of: outputting data blocks associated with a plurality of respective users in a plurality of corresponding data streams, the data blocks of each data stream being arranged in successive time frames of a constant, predetermined length; and multiplexing the data blocks on all the data streams for each given time frame. A communications system including circuitry for utilising such a method is also disclosed.
-
-
-
-
-
-
-
-
-
Search Results
107
records
(took 0.034 seconds)
