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Carrier search methods and apparatus

A carrier, carrier frequency technology, applied in the field of convenience and/or performing carrier search, which can solve the problem of task complexity

Inactive Publication Date: 2009-12-09
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As should be appreciated from the above description, the use of different frequency bands and / or carriers in different locations can significantly complicate the task faced by a wireless terminal of what frequency bands and / or carrier frequencies should be used within a particular geographic area

Method used

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  • Carrier search methods and apparatus
  • Carrier search methods and apparatus
  • Carrier search methods and apparatus

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Embodiment Construction

[0034] It is an object of the present invention to provide methods and devices that can be used to facilitate a wireless terminal to detect one or more carriers and / or a frequency band to use, for example, when communicating with base stations or other devices located in one or more geographic areas. Various embodiments of the invention use beacon signaling to facilitate detection and selection of carriers and / or frequency bands to use. In the context of this application, a beacon is a narrowband signal comprising one or more simultaneously transmitted higher power. Each narrowband signal within a beacon signal may correspond to a single tone. Beacon signals are typically sent using a higher power than that used to send data signals, such as 2, 5, 20, 100 or even more times the highest power of data signals.

[0035] The method and apparatus of the present invention can be used in a variety of communication systems, but is particularly suitable for frequency division multiple...

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Abstract

Transmitting signals to facilitate detection of a frequency band (406) and / or carrier signal to be used for communication with a basestation are described. The detected frequency band may be a downlink frequency band (420). The uplink frequency band (424) to be used can be determined from a know frequency relationship between the detected downlink carrier and a corresponding uplink carrier or by monitoring the detected downlink frequency band for information indicating the uplink frequency band / carrier to be used. Carrier search methods (402) involving searching for the narrowband high power signals (404) used to provide carrier information and / or to indicate the frequency band (406) to be monitored are described. Power detection methods can be used to detect the high power signals avoiding the need for symbol timing synchronization and / or channel estimation with regard to detection of the signals used to locate the frequency band to be used.

Description

technical field [0001] The present invention relates to communication systems, and more particularly, to methods and apparatus for facilitating and / or performing carrier searches. Background technique [0002] Various service providers have been acquiring spectrum in various frequency bands based on the availability of wireless communication spectrum in various relatively constrained geographic areas. At least some of these service providers aim to build a relatively large network by providing services using available frequency bands that can be obtained from various regions. [0003] Multichannel Multipoint Distribution System (MMDS) frequency band is a name sometimes used to describe an unconventional frequency band formed from a number of different frequency bands in different geographical areas. MMDS provides opportunities for service providers who have rights to use different spectrum in different geographical locations. MMDS frequency bands are unconventional because...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/38H04L5/00H04L27/26H04W48/10H04W48/16
Inventor 拉贾夫·拉罗亚查尔斯·斯坦斯基厉隽怿
Owner QUALCOMM INC