Adaptive medium access control scheme for wireless LAN

Patent 5384777 Issued on January 24, 1995. Estimated Expiration Date:

April 19, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Application

No. 049052 filed on 04/19/1993

US Classes:

370/337, Multiple access (e.g., TDMA)370/347, Multiple access (e.g., TDMA)370/395.53, Emulated LAN (LANE/ELAN/VLAN, e.g., Ethernet or token ring legacy LAN over a single ATM network/LAN)370/443, Using channel reservation370/447, Arbitration for access between contending stations370/461Arbitration for access between contending stations

Examiners

Primary: Marcelo, Melvin

Attorney, Agent or Firm

Perman & Green

International Classes

H04J 003/26
H04L 005/22

Abstract

A Medium Access (MAC) Protocol is utilized for wireless radio access for a plurality of remote stations to a base station on a LAN. There is a time division fixed frame structure in which time is slotted, and time slots are grouped into fixed frames consisting of data and control subframes or periods. The fixed frame structure consists of three periods (A, B, and C) along with their respective headers. The first period, the A period, is used exclusively for data transfer from the base station to the remote stations. The following period, the B period, is used for contention-free data transfer from the remote stations to the base station. The allocation of the data slots in the A and B periods is performed by the base station. The last period of the frame, designated as the C period, is used for the transmission of reservation requests and data from the remote stations to the base station in a random-access contention mode using a slotted Aloha protocol. The duration of the three periods may be varied using a movable boundary technique.

Other References

Lawrence G. Roberts, "Dynamic Allocation of Satellite Capacity Through Packet Reservation", Nat. Comput. Conf. AFIPS Conf. Proc. vol. 42, pp. 711-716, Jun. 1973
Stephen S. Rappaport, "Demand Assigned Multiple Access Systems Using Collision Type Request Channels: Traffic Capacity Comparisons", IEEE Trans. on Communications, vol. com-27, No. 9, Sep. 1979, pp. 1325-1331
"Efficiency of Packet Reservation Multiple Access" D. J. Goodman IEEE Trans. on Vehicular Techn. vol. 40 No. 1 Feb. 1991 pp. 170-176
"Medium Access Control Protocol for Wireless LANS" K. S. Natarajan et al, DOC:IEEE p. 802.11/92-93, pp. 1-2