Hybrid contention/polling access method

Details Hybrid contention/polling access method Hybrid contention/polling access method

1997-06-27

2000-09-05

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

3408255, 34082506, 34082507, 34082552, 370433, 370445, 370447, 370449, 370346, 710109, 709225, H04Q 900

Patent

active

061149683

ABSTRACT:
A system, device, and method for improving access in a hybrid contention/polling protocol maintains a list of active users, a list of recently active users, and a list of inactive users. An active user that becomes inactive is moved into the list of recently active users, and a recently active user that remains inactive is moved into the list of inactive users. A limited contention poll addressed to a number of inactive users and at least one recently active user authorizes any of the addressed users to contend for access to the shared channel. Upon detection of a collision, addressed users that are in the list of recently active users are polled individually, while the inactive users are sent a collision resolution poll which forces the inactive users to contend again for access. Users that become active are moved into the list of active users.

REFERENCES:
patent: 3755781 (1973-08-01), Haas et al.
patent: 4829297 (1989-05-01), Ilg et al.
patent: 5598150 (1997-01-01), Suzuki et al.

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