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Method for communication of information and apparatus employing method

An information unit, communication link technology, applied in wireless communication, communication between multiple stations, transmission modification based on link quality, etc., can solve problems such as reducing total transmission energy

Inactive Publication Date: 2005-07-13
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To this end, it is also possible to reduce the total transmission energy, which is the sum of the energy from the first transmission and any retransmissions

Method used

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  • Method for communication of information and apparatus employing method
  • Method for communication of information and apparatus employing method
  • Method for communication of information and apparatus employing method

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Embodiment Construction

[0052] Referring to Figure 1, a communications system 1 in the form of a cellular mobile radiotelephone system comprises a switching center 10 connected to the Public Switched Telephone Network (PSTN) and, if desired, to other data networks. Typically, the switching center is one of a plurality of switching centers and a plurality of base stations 20 are connected to each switching center. The main function of the base station 20 is to establish a radio link 30 with a terminal 40, such as a mobile phone (or so-called User Equipment (UE) in UMTS), and thus enable communication between the mobile terminal 40 and the rest of the system. Each base station 20 is typically capable of supporting multiple such links 30 and thus multiple mobile terminals 40 . Although base stations 30 and switching centers 10 are shown as separate components, this is for illustration only and switching centers and / or base stations may perform various functions depending on system implementation, as wil...

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Abstract

A method and apparatus for transmitting information in a communication link comprising transmitting information at a first power level, monitoring for correct receipt of the transmitted information, and failing correct reception, using a power different from that used for the original transmission. The second power level sends more information. This further information allows the content of the originally sent message to be determined and in one embodiment constitutes a retransmission of the originally sent message. By retransmitting at different power levels, the probability of correct reception can be increased, especially on wireless communication links. The first and second transmit power levels can be managed by using closed loop power control such that the transmit power level can be controlled so as to achieve reception quality parameter requirements at the receiving end of the link. In one approach the reception quality parameter is the signal-to-interference ratio.

Description

technical field [0001] The present invention relates to digital communication systems and more particularly to information exchange in variable quality wireless digital communication links. Larger quality variations are generally observed in wireless links, such as those found in a cellular mobile radiotelephone system, between a mobile telephone and a base station, than in wired links. The invention relates in particular but not exclusively to Code Division Multiple Access (CDMA) systems used in so-called third generation mobile telecommunication systems such as the Universal Mobile Telecommunication System (UMTS). Background technique [0002] Communication systems including mobile telecommunication systems and networks are increasingly using digital technologies. Such networks require the establishment of wireless radio communication links between mobile terminals and base stations (or fixed terminals). Both second and third generation mobile phone systems exchange digi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/005H04L1/18H04L69/40H04B7/26H04W52/08H04W52/12H04W52/24H04W52/26
CPCH04L1/0001H04L1/1809H04L1/1812H04L1/1867H04W52/08H04W52/12H04W52/24H04W52/265H04W52/267
Inventor T·J·穆尔斯利M·P·J·巴克
Owner KONINKLIJKE PHILIPS ELECTRONICS NV