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:
May. 21, 1996
Filed:
May. 26, 1994
Shigeru Otsuka, Tokyo, JP;
NEC Corporation, , JP;
Abstract
In a TDMA cellular communication network, one of the cell sites is a reference station for establishing a time reference in response to a timing signal from a mobile switching office, and each of the other cell sites is a subordinate station. Each subordinate station establishes a time slot in response to the timing signal from the mobile switching system and receives a signal from a mobile station located in the area of the reference station for detecting a time lapse between the time slot and the signal from the mobile station. A delay time is introduced to the time slot according to the time lapse so that the time slot is synchronized to the time reference of the reference station. In a second embodiment, each subordinate station transmits a signal indicative of the detected time lapse to the mobile switching system, where a delay time value is derived from those signals received from a chain of subordinate stations and returned to each subordinate station for performing the time slot adjustment. The delay time value is a modulo .tau. summation of the time lapses received from such chain of subordinate stations, where .tau. is the duration of the time slot.