1124347-A2 is referenced by 32 patents and cites 4 patents.

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.

Title
Uplink timing synchronization and access control
Application Number
EP20010300753 20010129
Publication Number
1124347 (A2)
Application Date
January 29, 2001
Publication Date
August 16, 2001
Inventor
Uppala Sathyadev Venkata
US
Rangan Sundeep
US
Li Junyi
US
Laroia Rajiv
US
Assignee
Lucent Technologies
US
IPC
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H04L 27/26
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H04L 05/02
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