SYSTEM AND METHOD FOR BROADCASTING OVERHEAD PARAMETERS IN POOR COVERAGE REGIONS
First Claim
1. A wireless communications system, comprising:
- an access node configured to broadcast a first overhead message on a first channel for covering a first channel environment within a coverage region and a second overhead message on a second channel for covering a second channel environment within the coverage region.
1 Assignment
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Accused Products
Abstract
To improve WWAN coverage, an access node broadcasts overhead messages on a first channel covering a first channel environment and a second channel covering a second channel environment within a coverage region. The overhead messages carry network overhead parameters for allowing wireless mobile devices to acquire and maintain traffic channels within the cellular system. The overhead message channels are configured so that a user perceives uninterrupted wireless services while moving through different channel environments in the coverage region. In one embodiment, the overhead message channels are separate physical channels configured with different broadcast parameters to provide coverage in different environments. In another embodiment, the overhead parameter information is segregated into base and extended components that are encoded and layer modulated onto separate logical channels. Using layered modulation, wireless mobile devices can receive base components in poor coverage regions. The base components include overhead parameters for acquiring a WWAN channel.
23 Citations
25 Claims
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1. A wireless communications system, comprising:
an access node configured to broadcast a first overhead message on a first channel for covering a first channel environment within a coverage region and a second overhead message on a second channel for covering a second channel environment within the coverage region. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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2. The wireless communications system of claim 2, wherein the first channel has a first set of predetermined parameters selected to support the first channel environment and the second channel has a second set of predetermined parameters selected to support the second channel environment.
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16. A wireless mobile device, comprising:
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a receiver for receiving a first overhead message channel and second overhead message channel broadcasted from a wireless wide area network (WWAN) access node; means for monitoring signal strength of a channel broadcasted from the WWAN access node; and a demodulator for selectively demodulating the first overhead message channel or the second overhead message channels based on the signal strength. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method for sending overhead information from an access node to a wireless mobile device in a coverage region comprising a first channel environment and a second channel environment, the method comprising:
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broadcasting a first overhead message including at least portion of the overhead information on a first channel for covering the first channel environment; and broadcasting a second overhead message including at least portion of the overhead information on a second channel for covering the second channel environment. - View Dependent Claims (23, 24, 25)
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Specification