The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 2008
Filed:
Sep. 28, 2004
Ivan Jesus Fernandez-corbaton, San Diego, CA (US);
Franklin Peter Antonio, Del Mar, CA (US);
Leonard Norman Schiff, San Diego, CA (US);
Ahmad Jalali, Rancho Santa Fe, CA (US);
Ivan Jesus Fernandez-Corbaton, San Diego, CA (US);
Franklin Peter Antonio, Del Mar, CA (US);
Leonard Norman Schiff, San Diego, CA (US);
Ahmad Jalali, Rancho Santa Fe, CA (US);
Qualcomm Incorporated, San Diego, CA (US);
Abstract
Systems, methods and apparatus for configuring and accessing a random access channel in a CDMA communication system are disclosed. The number of users supported by a random access channel can be optimized by assigning a distinct time of arrival to each of a plurality of users. Each of the users can be time synchronized and can transmit data at a time that compensates for a propagation delay to allow the data to arrive at the destination receiver at the assigned time. In a CDMA system, each of the users can transmit data that is spread with the same spreading code, provided the cross correlation properties of the code are sufficient to allow identification of a source that is time offset relative to another user. The time of arrival can be determined based on the number of active users, and can be assigned as often as each transmission by each user.