Automatic power control in uncoordinated frequency-hopping radio systems

A technology of power control and transmission power control, which is applied in the direction of transmission control/equalization, power management, transmission system, etc., and can solve problems such as unstable power adjustment

Inactive Publication Date: 2001-10-24
UNWIRED PLANET
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the system is frequency hopping at the packet rate, adjusting power based on successfully received packets is less stable

Method used

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  • Automatic power control in uncoordinated frequency-hopping radio systems
  • Automatic power control in uncoordinated frequency-hopping radio systems
  • Automatic power control in uncoordinated frequency-hopping radio systems

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Embodiment Construction

[0030] The various features of the invention will now be described with reference to the drawings, in which like parts are identified by like reference characters.

[0031] figure 1Two independent frequency hopping (FH) radio links 101 and 103 are illustrated that are closely spaced from each other. Exemplary applications employing these links are described in U.S. Patent Application Nos. 08 / 932911 (Haartsen), filed September 17, 1997, and U.S. Patent Application Nos. 08 / 932,244, filed September 17, 1997 (Haartsen). system, the contents of these two patent applications are hereby incorporated by reference in their entirety. The coverage area of ​​each radio unit is illustrated with a dotted circle. Units A and B communicate according to one FH scheme, and units C and D communicate according to another FH scheme. The two radio links 101 and 103 are not coordinated and occasionally use the same frequency hopping channel. In this case, depending on the relative distance betwe...

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PUM

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Abstract

Transmission power in a frequency-hopping radio system that transmits packets from a sending radio unit to a receiving radio unit, wherein each packet includes an address designating the receiving radio unit, is controlled by measuring received signal strength of packets whose addresses were successfully received in the receiving radio unit, regardless of whether other portions of the respective packets were successfully received. An average signal strength value is generated from the received signal strength measurements. The mathematical difference between the average signal strength value and a target value associated with the receiving radio unit is then determined and used as a basis for deciding whether to send a power control message from the receiving radio unit to the sending radio unit. In order to provide a hysteresis in the power control process, a power control message is sent from the receiving radio unit to the sending radio unit if the mathematical difference is greater than a first decision boundary, or if the mathematical difference is less than a second decision boundary. The power control message may itself include the mathematical difference which, when received by the sending radio unit, is used as a basis for determining a transmission power level adjustment amount. The target value, against which the average signal strength value is compared, may be based on the receiver sensitivity adjusted to account for implementation losses and other inaccuracies.

Description

Background of the invention [0001] The present invention relates to radio communication systems using frequency hopping (FH) spread spectrum techniques. In particular, the present invention relates to power control techniques for radio systems in which several uncoordinated asynchronous FH systems cover the area. [0002] In the past few decades, the development of radio and very large scale integration (VLSI) technology has promoted the application of radio communication in consumer electronics. Portable devices such as mobile radios can now be produced with acceptable price, size and power consumption characteristics. [0003] While today's wireless technology is primarily focused on voice communications (eg, handheld radios), this field is likely to expand in the near future to exchange more information with other types of nomadic and fixed devices. In particular, further developments in technology are likely to provide very cheap radios that can be integrated into many d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/713H04B1/04H04B7/005H04B7/26
CPCH04W52/367H04W52/42H04B1/713
Inventor S·马蒂松J·哈尔特森
Owner UNWIRED PLANET
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