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Downlink synchronization channel and methods for cellular systems

A downlink and synchronization technology, applied in the transmission system, communication between multiple stations, electrical components, etc., can solve the problems of long cell search time, reduction, high signal interruption probability, etc.

Inactive Publication Date: 2009-07-22
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This reduced performance results in longer cell search times, which can lead to higher chances of signal outages at handover

Method used

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  • Downlink synchronization channel and methods for cellular systems
  • Downlink synchronization channel and methods for cellular systems
  • Downlink synchronization channel and methods for cellular systems

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Experimental program
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Embodiment Construction

[0026] now refer to figure 1 , in which is shown a diagram of an embodiment of a cellular network, generally designated 100, constructed in accordance with the principles of the present invention. Cellular network 100 includes a cellular network having a central cell site and six peripheral first-tier cell sites. A central base station BS1 is used for the center point, and the first layer base stations BS2-BS7 are used for the surrounding first layer points, as shown in the figure. The cellular network 100 also includes user equipment UE, which is located at a central point. Note that a cell can consist of one or more cells. A cell is usually associated with a sector. Therefore, we use the terms "cell" and "sector" interchangeably. A "point" represents a set of cells / sectors associated with the same base station.

[0027] The central base station BS1 comprises a base station transmitter 105 with a synchronization unit 106 and a transmission unit 107 . In one embodiment, ...

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PUM

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Abstract

The present invention provides a method of operating a base station transmitter. The method includes providing a cellular downlink synchronization signal having primary and secondary portions, wherein the primary portion employs a corresponding one of a plurality of different primary signals allocated to adjoining transmission cells. The method also includes further providing cell- specific information in the secondary portion and transmitting the cellular downlink synchronization signal. In one embodiment, the primary portion explicitly indicates a partial cell identification information and the remaining cell identification information is carried in the secondary portion. In another embodiment, the plurality of different primary signals are simply used to avoid the channel mismatch effect. The present invention also provides a method of operating user equipment. The method includes receiving a cellular downlink synchronization signal having primary and secondary portions wherein the timing acquisition is performed in conjunction with the primary synchronization sequence index detection via the primary portion. In addition, the secondary portion provides cell-specific parameters and identifying and extracting the secondary portion.

Description

technical field [0001] The present invention is directed to wireless communications in general, and more particularly to transmitters and receivers, methods of operating transmitters and receivers, and cellular communication systems employing the transmitters, receivers and methods. Background technique [0002] In cellular networks, such as those employing Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA), each cell employs a base station that communicates with user equipment (such as cellular telephone, laptop or PDA) communication. When a user device is first turned on, an initial cell search must be performed in order to connect to the cellular network. This involves a downlink synchronization procedure between the base station and the user equipment, where the base station sends synchronization signals to the user equipment. The synchronization signal is usually called a synchronization preamble in IEEE 802.16e ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B1/707
Inventor E·N·昂古塞努斯A·G·达巴克B·N·瓦拉达拉贾
Owner TEXAS INSTR INC