SOFT HANDOFF IN OFDMA SYSTEM
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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.
11 Citations
57 Claims
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1-22. -22. (canceled)
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23. A method for receiving data in an orthogonal frequency division multiplexing access (OFDMA) system comprising:
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a device receiving a plurality of orthogonal frequency division multiplexing (OFDM) symbols representing data from a transmitting device, said plurality of OFDM symbols comprising a first plurality of subcarriers, said first plurality of subcarriers being defined in a soft handoff zone and said first plurality of subcarriers in said soft handoff zone having a subchannel definition, wherein the soft handoff zone comprises; a first dimension of subchannels, said first dimension of subchannels comprising said first plurality of subcarriers; and a second dimension of divided and multiplexed OFDM symbols; and the device processing the received symbols to recover the data from the transmitting device. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A non-transitory, computer accessible memory medium storing program instructions for receiving data in an orthogonal frequency division multiplexing access (OFDMA) system, wherein the program instructions are executable to:
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receive a plurality of orthogonal frequency division multiplexing (OFDM) symbols representing data from a transmitting device, said plurality of OFDM symbols comprising a first plurality of subcarriers, said first plurality of subcarriers being defined in a soft handoff zone and said first plurality of subcarriers in said soft handoff zone having a subchannel definition, wherein the soft handoff zone comprises; a first dimension of subchannels, said first dimension of subchannels comprising said first plurality of subcarriers; and a second dimension of divided and multiplexed OFDM symbols; and process the received symbols to recover the data from the transmitting device. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A mobile station, configured to perform orthogonal frequency division multiplexing access (OFDMA) communication, comprising:
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one or more antennas configured to receive a plurality of orthogonal frequency division multiplexing (OFDM) symbols representing data from a transmitting device, said plurality of OFDM symbols comprising a first plurality of subcarriers, said first plurality of subcarriers being defined in a soft handoff zone and said first plurality of subcarriers in said soft handoff zone having a subchannel definition, wherein the soft handoff zone comprises; a first dimension of subchannels, said first dimension of subchannels comprising said first plurality of subcarriers; and a second dimension of divided and multiplexed OFDM symbols; and processing hardware coupled to the one or more antennas, wherein the processing hardware is configured to processing the received symbols to recover the data from the transmitting device. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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Specification