HYBRID CONTENTION/POLLING ACCESS METHOD
 Inventors: Krishnan Ramakrishnan, Ashland;
Stephen Schroeder, Avon; John A.
Perreault, Hopkinton, all ol Mass.
 Assignee: Motorola Inc., Schaumburg, 111.
 Appl. No.: 08/883,972  Filed: Jun. 27, 1997
 Int. C I. II04Q 9/00
 U.S. CI 340/825.08; 340/825.5
340/825.06; 340/825.07; 340/825.52; 370/433 370/445; 370/447; 370/449; 370/346; 710/109
 Field of Search 340/825.08, 825.5,
340/825.06, 825.07, 825.52; 395/289, 200.55; 370/433, 346, 445, 447, 449; 710/109;
 References Cited
U.S. PATENT DOCUMENTS
3,755,781 8/1973 Haas et al 340/825.08
A system, device, and method for improving access in a hybrid contention/polling protocol maintains a list ol active users, a list ol recently active users, and a list ol inactive users. An active user that becomes inactive is moved into the list ol recently active users, and a recently active user that remains inactive is moved into the list ol inactive users. A limited contention poll addressed to a number ol inactive users and at least one recently active user authorizes any ol the addressed users to contend for access to the shared channel. Upon detection ol a collision, addressed users that are in the list ol 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 ol active