Soft handoff in OFDMA system
First Claim
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1. A method for facilitating soft handoffs in an orthogonal frequency division multiplexing access (OFDMA) system comprising the steps of:
- a) dividing subcarriers in a plurality of orthogonal frequency division multiplexing (OFDM) symbols;
b) allocating said divided subcarriers into subchannels;
c) dividing and multiplexing said plurality of OFDM symbols;
d) defining a soft handoff zone comprising a first dimension of said subchannels and a second dimension of said divided and multiplexed plurality of OFDM symbols, said soft handoff zone having a first plurality of subcarriers, said first plurality of subcarriers having a subchannel definition; and
e) transmitting said first plurality of subcarriers in said soft handoff zone to a station.
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Abstract
Soft handoff in an OFDMA system is disclosed. If the pilot signal strength for a base station exceeds the defined threshold, the base station is added to an active set list. Subcarriers in a plurality of orthogonal frequency division multiplexing (OFDM) symbols are divided and allocated into subchannels. The OFDM symbols are divided and multiplexed. A soft handoff zone with a first dimension of the subchannels and a second dimension of the divided and multiplexed OFDM symbols is defined. The soft handoff zone has subcarriers with a subchannel definition, for example, an identical permutation.
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Citations
38 Claims
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1. A method for facilitating soft handoffs in an orthogonal frequency division multiplexing access (OFDMA) system comprising the steps of:
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a) dividing subcarriers in a plurality of orthogonal frequency division multiplexing (OFDM) symbols; b) allocating said divided subcarriers into subchannels; c) dividing and multiplexing said plurality of OFDM symbols; d) defining a soft handoff zone comprising a first dimension of said subchannels and a second dimension of said divided and multiplexed plurality of OFDM symbols, said soft handoff zone having a first plurality of subcarriers, said first plurality of subcarriers having a subchannel definition; and e) transmitting said first plurality of subcarriers in said soft handoff zone to a station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification