System and method for ranging for a fast handover in a...

Details System and method for ranging for a fast handover in a... System and method for ranging for a fast handover in a...

2007-12-11

2007-12-11

Perez-Gutierrez, Rafael (Department: 2617)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C455S437000, C455S438000, C455S439000, C455S440000, C455S441000, C455S442000, C455S443000, C455S444000

Reexamination Certificate

active

10998890

ABSTRACT:
A mobile communication system using an orthogonal frequency division multiplexing (OFDM)/orthogonal frequency division multiple access (OFDMA) scheme. The method for assigning ranging codes in the OFDM/OFDMA communication system includes classifying rangings between a base station and a mobile subscriber station (MSS) of the OFDM/OFDMA communication system into an initial ranging, a periodic ranging, a bandwidth request ranging, and a handover ranging. A first number of ranging codes used for the rangings are created and a second number of ranging codes selected from the first number of ranging codes are assigned as handover ranging codes used for the handover ranging.

REFERENCES:
patent: 2005/0101326 (2005-05-01), Kang et al.

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