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

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4 Author(s)
Karol, M.J. ; Lucent Technol., AT&T Bell Labs., Holmdel, NJ, USA ; Haas, Z.J. ; Woodworth, C.B. ; Gitlin, R.D.

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. Users with high-data-rate requirements can “grab all the band-width” 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%

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Vehicular Technology, IEEE Transactions on  (Volume:46 ,  Issue: 4 )