| 词条 | Self-organized time-division multiple access |
| 释义 |
Self-organized time-division multiple access (STDMA) is a channel access method designed by Håkan Lans,[1] based on time-division multiplexing. The term "self-organized" describes the manner in which time slots are assigned to users. Time-division multiple access (TDMA) divides a channel into frames, which furthermore are subdivided into a vast number of time slots. Users transmit in rapid succession, one after the other, each using their own time slot. One of the drawbacks of TDMA is that it requires a central station for slot assignment and time synchronisation. STDMA proposes a method for assigning slots without the involvement of a central station. Time synchronisation is usually taken care of using Coordinated Universal Time (UTC). STDMA is in use by the Automatic Identification System (AIS), a standard marine short-range coastal tracking system, and is the base of the International Civil Aviation Organization VHF Data Link Mode 4. While the method was patented,[1] a US patent ex-parte reexamination certificate was issued in 2010 canceling all claims.[2] References1. ^1 {{cite patent | country = US | number = 5506587 | status = patent | title = Position indicating system | gdate = 1996-04-09 | fdate = 1993-12-23 | pridate = 1991-07-01 | inventor = Lans, Håkan | invent1 = Lans, Håkan | assign1 = GP&C Systems International AB}} 2. ^USPTO ex-parte reexamination certificate (7428th), issued on March 30, 2010. External links
1 : Maritime communication |
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