Time-frequency-code slicing: Efficiently allocating the communications spectrum to multirate users

M.J. Karol

doi:10.1109/25.653056

Time-frequency-code slicing: Efficiently allocating the communications spectrum to multirate users

1997-01-01

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AI

DOI：10.1109/25.653056

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The time-frequency-code slicing technique allows multiple users with different data-rate requirements access to a communications resource in a manner that is cost effective over a wide range of access rates, For instance, with a time-frequency slicing (TFS) approach, users are assigned different portions of the frequency spectrum (e.g., on a slot-by-slot basis), granting them access to a fraction of the shared resource that is commensurate with their needs and their own end equipment, sers with high-data-rate requirements can ''grab all the bandwidth'' when no one else needs it, Also, by efficiently packing the time-frequency space, better system utilization is attained, For the specific case of TFS, we compute the reduction in blocking probability achieved under the constraint of a single transmitter/receiver per user, As an example, consider the case of 70% traffic load with ten frequency bands and 15 time slots per frame, Using the traditional allocation scheme in which users can be assigned only a single-frequency band per time slot, there is a 10% blocking probability for new connections that request 14 ''time-frequency slices.'' The TFS technique reduces this blocking probability to well below 0.01%.

Keywords:

access protocols

code-division multiaccess

frequency-division multiaccess

GSM

IS-54

time-division multiaccess

Time-frequency-code slicing: Efficiently allocating the communications spectrum to multirate users

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