Group TDMA frame allocation method and apparatus

Details Group TDMA frame allocation method and apparatus Group TDMA frame allocation method and apparatus

2007-06-19

2007-06-19

Eng, George (Department: 2617)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S321000, C370S329000, C370S347000, C455S450000, C455S453000

Reexamination Certificate

active

10801167

ABSTRACT:
A Group TDMA multiple destination, multiple node wireless network includes a first destination having a first group of nodes (Group1) in communication range and a second destination having a second group of nodes (Group2) in communication range. A third group of nodes (Group3) are within communication range of both first and second destinations. Each group of nodes is assigned a periodically recurring set of time slots for transmitting to a designated destination. A network processor is programmed for (a) dividing the frame into a number of fixed-length time slots; (b) assigning a fraction 1−x of the time slots to the first and second groups of nodes; (c) assigning a fraction x of the time slots to the third group; (d) subdividing the third group into a fourth group of nodes and a fifth group of nodes; (e) assigning a fraction y of the fraction x time slots to the fourth group for transmission to the first destination and a fraction 1−y of the fraction x time slots to the fifth group for transmission to the second destination; (f) applying a multiple-access protocol to each group in its assigned set of time slots; and (g) optimizing the values of x and y in order to realize the maximum possible value of stable throughput rate λ*. Group TDMA provides increased throughput capacity as it provides a balance between scheduled access and pure random access. Nodes may be grouped according to geographical location as well as arbitrary criteria, such as priority or node mission.

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