Contention based random access method with autonomous...

Details Contention based random access method with autonomous... Contention based random access method with autonomous...

2011-01-25

2011-01-25

Ferris, Derrick W (Department: 2463)

Multiplex communications

Channel assignment techniques

Using time slots

C370S203000

Reexamination Certificate

active

07876774

ABSTRACT:
A plurality of user terminals shares an uplink channel having a plurality of subcarriers according to a contention based random access protocol. Each user terminal is assigned one or more primary subcarriers, which are reserved for specific user terminals. In addition, a pool of supplemental subcarriers is available for use by any user terminal. When a user terminal sends a data packet, the user terminal transmits at least a first portion of the data packet on its assigned primary subcarriers. If additional subcarriers are needed, the user terminal autonomously selects one or more supplemental subcarriers from the pool to transmit a second portion of the data packet. The access point knows a priori which ones of the user terminals are assigned to each of the primary subcarriers. When a user terminal selects one or more supplemental subcarriers, the user terminals send to subcarrier selection information to the access point.

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M. Tsatsania, R. Zhang, and S. Banerjee, “Network-Assisted Diversity for Random Access Wireless Networks,” IEEE Trans. On Signal Processing, vol. 48, No. 3, Mar. 2000, pp. 702-711.

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