Patent Number: 6,167,056

Title: Access channel slot sharing

Abstract: The present invention is a system and method for increasing user capacity on a slotted random access channel in a spread spectrum communications system by using a multi-part access probe. First and second parts of the access probe are modulated using a short PN code sequence, and the entire access probe is modulated using a long PN code sequence. Information to be transmitted by the access probe is modulated on the second part of the access probe, and the access probe is transmitted so that the first part of the probe falls within the boundaries of an access channel slot. In one embodiment, time slots in access channels used for access signal reception are made the length of the first part. In a further embodiment, time slots in a plurality of adjacent access channels used for access signal reception may be longer than said first part but are offset in time from each other by the length or period of the first part.

Inventors: Miller; David S. (Carlsbad, CA), Vijayan; Rajiv (San Diego, CA), Zehavi; Ephraim (Haifa, IL), Levin; Jeffrey A. (San Diego, CA)

Assignee: Qualcomm Incorporated

International Classification: H04B 7/204 (20060101); H04B 1/707 (20060101); H04B 7/185 (20060101); H04B 7/216 (20060101); H04B 7/26 (20060101); H04B 007/216 (); H04J 003/06 (); H04L 027/30 (); H04L 007/00 ()

Expiration Date: 12/26/2017