LOCAL AND WIDE-AREA TRANSMISSIONS IN A WIRELESS BROADCAST NETWORK
First Claim
1. A method of broadcasting data in a wireless broadcast network, comprising:
- multiplexing data for a wide-area transmission onto a first transmission span, the wide-area transmission being sent from a plurality of transmitters in the network;
multiplexing data for a local transmission onto a second transmission span, wherein the multiplexing is onto frequency subbands pseudo-randomly selected from among all usable frequency subbands and the local transmission being sent from a subset of the plurality of transmitters;
selecting the first and second transmission spans based on an amount of data to broadcast for the wide-area transmission and an amount of data to broadcast for the local transmission; and
broadcasting the local and wide-area transmissions via a wireless link,wherein the data for the wide-area transmission and the data for the local transmission are time division multiplexed (TDM) at each base station, and wherein the first and second transmission spans are first and second time segments, respectively, of a frame of a predetermined time duration.
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Accused Products
Abstract
To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.
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Citations
50 Claims
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1. A method of broadcasting data in a wireless broadcast network, comprising:
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multiplexing data for a wide-area transmission onto a first transmission span, the wide-area transmission being sent from a plurality of transmitters in the network; multiplexing data for a local transmission onto a second transmission span, wherein the multiplexing is onto frequency subbands pseudo-randomly selected from among all usable frequency subbands and the local transmission being sent from a subset of the plurality of transmitters; selecting the first and second transmission spans based on an amount of data to broadcast for the wide-area transmission and an amount of data to broadcast for the local transmission; and broadcasting the local and wide-area transmissions via a wireless link, wherein the data for the wide-area transmission and the data for the local transmission are time division multiplexed (TDM) at each base station, and wherein the first and second transmission spans are first and second time segments, respectively, of a frame of a predetermined time duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 50)
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11. An apparatus in a wireless broadcast network, comprising:
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means for multiplexing data for a wide-area transmission onto a first transmission span, the wide-area transmission being sent from a plurality of transmitters in the network; means for multiplexing data for a local transmission onto a second transmission span, wherein the multiplexing is onto frequency subbands pseudo-randomly selected from among all usable frequency subbands and the local transmission being sent from a subset of the plurality of transmitters; means for selecting the first and second transmission spans based on an amount of data to broadcast for the wide-area transmission and an amount of data to broadcast for the local transmission; and means for broadcasting the local and wide-area transmissions via a wireless link, wherein the wireless broadcast network utilizes orthogonal frequency division multiplexing (OFDM), wherein the data for the wide-area transmission and the data for the local transmission are time division multiplexed (TDM) at each base station, and wherein the first and second transmission spans are first and second time segments, respectively, of a frame of a predetermined time duration. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A wireless device for broadcasting data in a wireless broadcast network, comprising:
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a multiplexer for multiplexing data for a wide-area transmission onto a first transmission span, the wide-area transmission being sent from a plurality of transmitters in the network, and for multiplexing data for a local transmission onto a second transmission span, wherein the multiplexing is onto frequency subbands pseudo-randomly selected from among all usable frequency subbands and the local transmission being sent from a subset of the plurality of transmitters; a processor coupled to the multiplexer for selecting the first and second transmission spans based on an amount of data to broadcast for the wide-area transmission and an amount of data to broadcast for the local transmission; and a transmitter coupled to the processor for broadcasting the local and wide-area transmissions via a wireless link, wherein the data for the wide-area transmission and the data for the local transmission are time division multiplexed (TDM) at each base station, and wherein the first and second transmission spans are first and second time segments, respectively, of a frame of a predetermined time duration. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of receiving data in a wireless broadcast network, comprising:
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receiving via a wireless link a broadcast transmission comprised of a wide-area transmission and a local transmission, the wide-area transmission being sent from a plurality of transmitters in the network, and the local transmission being sent from a subset of the plurality of transmitters; if the wide-area transmission is being received, demultiplexing the data for the wide-area transmission from a first transmission span; and if the local transmission is being received, demultiplexing the data for the local transmission from a second transmission span, wherein the data for the local transmission are multiplexed onto frequency subbands pseudo-randomly selected from among all usable frequency subbands, wherein the data for the wide-area transmission and the data for the local transmission are time division multiplexed (TDM) at each base station, and wherein the first and second transmission spans are a first time segment and a second time segment, respectively, of a frame and are based on an amount of data broadcast on the wide-area transmission and an amount of data broadcast on the local transmission. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A wireless device for receiving data in a wireless broadcast network, comprising:
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a receiver for receiving via a wireless link a broadcast transmission comprised of a wide-area transmission and a local transmission, the wide-area transmission being sent from a plurality of transmitters in the network, and the local transmission being sent from a subset of the plurality of transmitters; and a demultiplexer configured to demultiplex the data for the wide-area transmission from a first transmission span if the wide-area transmission is being received, and to demultiplex the data for the local transmission from a second transmission span if the local transmission is being received, wherein the data for the local transmission are multiplexed onto frequency subbands pseudo-randomly selected from among all usable frequency subbands, wherein the data for the wide-area transmission and the data for the local transmission are time division multiplexed (TDM) at each base station, and wherein the first and second transmission spans are a first time segment and a second time segment, respectively, of a frame and are based on an amount of data broadcast on the wide-area transmission and an amount of data broadcast on the local transmission. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49)
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Specification