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Pilot signal transmission in a radio communication system

A pilot signal and transmit power technology, applied in radio transmission systems, wireless communications, transmission systems, etc., can solve problems such as low system efficiency, and achieve the effects of reducing interference, high access reliability, and maintaining access reliability.

Inactive Publication Date: 2009-12-16
MOTOROLA MOBILITY LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such systems, the air interface resources used to transmit pilot signals become increasingly important and tend to result in low system efficiency

Method used

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  • Pilot signal transmission in a radio communication system
  • Pilot signal transmission in a radio communication system
  • Pilot signal transmission in a radio communication system

Examples

Experimental program
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Embodiment Construction

[0024] The following description focuses on embodiments of the present invention applicable to an access point as a base station of a 3rd generation cellular communication system, such as UMTS. In an example, the access point is a picocell base station supporting one of a large number of picocells below a macrocell. It should be understood that the invention is not limited to this application, but may be applied to many other radio communication systems, including for example GSM cellular communication systems or Wireless Local Area Networks (WLAN).

[0025] In this particular scenario, an access point in the form of a UMTS picocell base station supports very small cells with a radius of eg 10-50 meters. An access point is one of many small base stations that support similarly sized pico cells. For example, an access point may support individual apartments or floors of condominiums in a building.

[0026] figure 1 is an illustration of an access point according to some embo...

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Abstract

An access point for a radio communication system transmits a pilot signal. The access point can operate in different modes with the pilot signal transmit power being controlled differently. A mode processor (105) controls a pilot signal controller (103) such that when in a first mode the access point is arranged to vary a pilot signal transmit power in accordance with a first transmit power profile. Another mode processor (107) controls the pilot signal transmit power in accordance with a second profile in a second mode. The transmit power may be constant during the second mode. A transition processor (111) is arranged to transition the access point from the first mode to the second mode in response to receiving an access request for a remote station.

Description

technical field [0001] The present invention relates to the transmission of pilot signals in radio communication systems, in particular, but not exclusively, to the transmission of pilot signals in cellular communication systems, such as Global System for Mobile Communications (GSM) or Universal Mobile Telecommunications System (UMTS). Background technique [0002] The transmission of reference pilot signals is often used in radio communication systems. For example, in a cellular system such as GSM or UMTS, the base station transmits a reference or pilot signal (eg, the beacon signal in CDMA / UMTS or the BCCH in GSM) that mobile stations use to make power measurements. These measurements can then be used directly by the mobile station to perform cell selection and reselection, or transmitted to an underlying structure for further processing. Essentially, these measurements are used to determine the level of coverage / service that a mobile station obtains from a particular bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/00
CPCH04W52/325H04W52/367H04W52/244H04W88/10H04W52/0232Y02B60/50H04W52/143Y02D30/70
Inventor 埃里克·R·维利耶路易斯·洛佩斯
Owner MOTOROLA MOBILITY LLC