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Beacon signaling in a wireless system

A communication system, the first-time technology, applied in wireless communication, diversity/multi-antenna system, transmission system, etc.

Inactive Publication Date: 2009-12-16
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But inter-sector interference due to limited antenna isolation and reflections from objects may limit the practical capability obtained on one full cell

Method used

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  • Beacon signaling in a wireless system
  • Beacon signaling in a wireless system
  • Beacon signaling in a wireless system

Examples

Experimental program
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Embodiment Construction

[0058] For an OFDM spread spectrum system, the tones used in a particular cell are all orthogonal. Therefore, the data hopping sequence and the physical channel do not interfere with each other. Given wireless channel propagation characteristics, depending on its location, a wireless terminal may experience a large dynamic range of channel conditions, where the channel conditions are measured in terms of signal-to-interference ratio (SIR) or signal-to-noise ratio (SNR). Such a property can be exploited to enhance system capabilities. For example, according to the present invention, a scheduler can optimally balance power in traffic channels by simultaneously serving wireless terminals with very different wireless channel conditions. In this case, a wireless terminal with a bad wireless channel condition may be allocated a large portion of the transmit power and may be allocated a small portion of the bandwidth in order to obtain service robustness, while a wireless terminal w...

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Abstract

Several high power tones for synchronization and / or other purposes are transmitted in an FDM system into an area, eg a sector of a cell, during a time period, eg a symbol transmission period. Signals are transmitted during normal data transmission symbol periods with, for example, at least 10 tones per symbol time. Fewer than 5 high-power signals are transmitted in a symbol time, wherein at least 80% of the maximum total transmitter power used for transmission into said area is allocated to the high-power signals, wherein the maximum total transmitter power is based on a The time period may include one or more data and / or high power tone transmission periods. When a high power tone is transmitted, up to 20% of the transmitter power used to transmit into the area can be used to transmit other tones, where the power is typically distributed among the tones. Certain signals that would otherwise be transmitted in one symbol time are often not used during the transmission of high power signals.

Description

Background technique [0001] Spread spectrum OFDM (Orthogonal Frequency Division Multiplexing) multiple access is an example of a spectrally efficient wireless communication technique. OFDM can be used to provide wireless communication services. [0002] In OFDM spread spectrum systems, the total spectral bandwidth is usually divided into a number of orthogonal tones, ie, subcarrier frequencies. In a cellular network, the same bandwidth is usually reused in all cells of the system. Those tones are hopped across the bandwidth for channel (frequency) diversity and interference averaging. Tone hopping follows a predefined tone hopping sequence so that the hopped tones of a given cell do not collide with each other. The tone hopping sequences used in neighboring cells may be different in order to average out the interference between cells. [0003] A typical form of tone hopping sequence is [0004] Fj ( t ) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04B7/005H04B7/12H04L27/26H04W52/34H04W52/42H04W56/00
CPCH04W52/34H04B7/12H04L27/2662H04W52/42H04J1/00H04J3/06H04W84/10
Inventor 拉吉弗·拉罗亚弗兰克·A·兰尼厉隽怿
Owner QUALCOMM INC