H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/11
H04J 3/14 (2006.01)
Patent
CA 1172392
A BATON PASSING METHOD AND APPARATUS FOR MAINTAINING SYNCHRONIZATION IN A TDMA SATELLITE COMMUNICATION SYSTEM Abstract In a TDMA satellite communication system, one of the stations is elected the primary station which transmits a reference burst to all other stations to synchronize the local clocks in each station. Each subsidiary station in turn responds by transmitting a local trans- mit reference burst to enable synchronization of the local transmit clocks. In order to assure that the synchronous operation of the network will continue when the reference station experiences a failure, an alternate reference station is designated in the network which will assume the role of the primary reference station in a baton passing operation in the event that the existing primary reference station must abdicate its reference role. An improved method and apparatus for carrying out the baton passing operation monitors the channel error rate at the reference station and the alternate station. The error rate is measured by detecting FEC from as- sessing the error syndromes in the reference bursts from the reference station as received at the reference and alternate stations. This refined monitoring technique is combined with the coarser technique of monitoring the number of negative acknowledgement signals from the subsidiary stations indicating that they have not correctly MA9-78-012 received reference bursts, to yield a more refined determination at the reference stations of its effective- ness as a reference station. The alternate station uses a similar technique to determine if it is sufficiently healthy to play the role of alternate station. In addition all earth stations equipped with the channel error rate measuring device can inhibit their operation during extreme channel error conditions. MA9-78-012
436543
Fennel John W. Jr.
Yin Huo-Bing
Barrett B.p.
International Business Machines Corporation
LandOfFree
Baton passing method and apparatus for maintaining... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Baton passing method and apparatus for maintaining..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Baton passing method and apparatus for maintaining... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1306274