Synchronized broadcast/multicast communication
First Claim
1. An access network apparatus, comprising:
- a first transmitter;
a first modulator to modulate a first waveform associated with unicast transmissions, the first waveform specific to the first transmitter;
a broadcast modulator to modulate a second waveform associated with broadcast transmissions, the second waveform used by both the first transmitter and at least a second transmitter distinct from the first transmitter to transmit the broadcast transmissions; and
a modulation controller to select, in response to a type of information to be transmitted by the first transmitter, the first modulator or the broadcast modulator.
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Accused Products
Abstract
Synchronized broadcast transmits a same broadcast content using a same waveform from multiple transmitters. Transmitters each apply a same spreading code for broadcast transmissions. In a spread-spectrum communication system having a time division multiplexed forward link, a synchronized broadcast transmission is inserted into a broadcast slot. One embodiment employs an Orthogonal Frequency Divisional Multiplex (OFDM) waveform for the synchronized broadcast. An OFDM receiver is then used to process the received synchronized broadcast transmission. An alternate embodiment implements a broadcast Pseudo-random Noise (PN) code for use by multiple transmitters. An equalizer is then employed to estimate the synchronized broadcast transmission.
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Citations
27 Claims
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1. An access network apparatus, comprising:
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a first transmitter; a first modulator to modulate a first waveform associated with unicast transmissions, the first waveform specific to the first transmitter; a broadcast modulator to modulate a second waveform associated with broadcast transmissions, the second waveform used by both the first transmitter and at least a second transmitter distinct from the first transmitter to transmit the broadcast transmissions; and a modulation controller to select, in response to a type of information to be transmitted by the first transmitter, the first modulator or the broadcast modulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An access terminal apparatus, comprising:
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means for demodulating unicast transmissions; means for demodulating broadcast transmissions that include a first broadcast transmission from a first base station and a second broadcast transmission from a second base station, wherein the first broadcast transmission and the second broadcast transmission are processed by the means for demodulating the broadcast transmissions as multipath components of a same signal; and means for selecting, in response to a type of information received, the means for demodulating unicast transmissions or the means for demodulating broadcast transmissions. - View Dependent Claims (12, 13, 14)
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15. A computer-implemented method, comprising:
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modulating, by a first modulator, unicast information using a first waveform associated with unicast transmissions, the first waveform specific to a first transmitter; modulating, by a broadcast modulator, broadcast information using a second waveform associated with broadcast transmissions, the second waveform used by both the first transmitter and at least a second transmitter distinct from the first transmitter to transmit the broadcast transmissions; and selecting, by a modulation controller and in response to a type of information to be transmitted, the first modulator or the broadcast modulator. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A non-transitory computer-readable medium storing instructions operable, when executed by a processor, to cause the processor to:
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demodulate unicast transmissions; demodulate broadcast transmissions including a first broadcast transmission from a first base station and a second broadcast transmission from a second base station, wherein the first broadcast transmission and the second broadcast transmission are processed by the processor as multipath components of a same signal; and select, in response to a type of information received, demodulation of the unicast transmissions or demodulation of the broadcast transmissions. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification