EP0898830A1 - Interface air adaptative - Google Patents

Interface air adaptative

Info

Publication number
EP0898830A1
EP0898830A1 EP97914742A EP97914742A EP0898830A1 EP 0898830 A1 EP0898830 A1 EP 0898830A1 EP 97914742 A EP97914742 A EP 97914742A EP 97914742 A EP97914742 A EP 97914742A EP 0898830 A1 EP0898830 A1 EP 0898830A1
Authority
EP
European Patent Office
Prior art keywords
air interface
adaptive air
interface according
space
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97914742A
Other languages
German (de)
English (en)
Inventor
Torbjörn JOHNSON
Bo. G. Magnusson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Radio Design Innovation AB
Original Assignee
Radio Design Innovation AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Radio Design Innovation AB filed Critical Radio Design Innovation AB
Publication of EP0898830A1 publication Critical patent/EP0898830A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters

Definitions

  • the present invention relates to an adaptive air inter ⁇ face suitable for use in a cellular telecommunication sys ⁇ tem.
  • the air interface is the hardware and software device providing means for communicating over the free space with a device containing exactly the same air interface.
  • An air in ⁇ terface contains various kinds of information elements to make this possible such as framing data, synchronization data, information data and error control data.
  • the present invention solves the above-mentioned problem by providing an air interface that is adapted to various re ⁇ quirements in dependence of the current operating conditions and needs.
  • the adaptive air interface in accordance with the invention includes means for collecting parameter require ⁇ ments, means for relating the parameter requirements to an input space, means for transforming the input space to an output space, the output space defining the operating para- meters of the air interface.
  • Figure 1 is a block diagram of the transformation of the input space to the output space in accordance with the in ⁇ vention
  • Figure 2 is a block diagram of the fuzzy logic control in accordance with the invention
  • FIGS 3A to F are diagrams of the input variable membership functions
  • FIGS 4A to F are diagrams of the output variable membership functions.
  • the air interface in accordance with the present in ⁇ vention is described with respect to a mobile telecommuni- cation system below, but is equally applicable to other air interfaces as is appreciated by a person skilled in the art.
  • the adaptive air interface contains a number of parameters and schemes that are controlled adaptively. Some of the pro- porties of the adaptive air interface are
  • the air interface according to the invention enables adaptivity according to situations and scenarios at hand. A number of possibilities arises namely with the following adaptable parameters in what is called the output space
  • the decisions behind the parameters are based on mea ⁇ surements, user needs, operator considerations and given re ⁇ sources using an optimizing algorithm. These parameter re ⁇ quirements are collected by the interface.
  • the requirements are related to the input data or the input space consisting of the following parameters
  • Figure 1 is shown a block diagram of the transfor ⁇ mation of the input space to the output space.
  • the input space is processed by a logic control box including rules for the transformation.
  • a finite state machine has a finite number of states of the input variables which are transformed by logic rules to output variables. Below is an example of logic rules in a finite state machine.
  • fuzzy logic controller operates on a number of membership functions ⁇ . For each variable a number of membership functions are defined.
  • the membership func ⁇ tions may assume various values ranging from zero to one and not just the discrete numbers zero and one.
  • each input variable has a set of three membership functions taking on different values for a specific value on the x axis .
  • the fuzzy logic controller contains rules for trans ⁇ forming the input membership functions to output membership functions.
  • An example of output membership functions is illustrated in Figures 4A to F.
  • the fuzzy logic controller also includes rules for "defuzzufication" which gives a crisp value on the x axis for the set of mem ⁇ bership function values.
  • fuzzy logic controller also called' fuzzy rule base
  • fuzzy rule base The logic rules of the fuzzy logic controller, also called' fuzzy rule base, are determined by detailed sec ⁇ gation of the particular problem at hand. There are commer- cially available computer-aided methods for defining, tuning and optimising the fuzzy rule base.
  • Input xc implies x ir where x i ⁇ xc ⁇ x i +l.
  • the output variables can assume the following values :
  • Optimization of output variables, according to selected cost functions, is performed in order to e.g. maximize quan ⁇ tities like capacity and throughput, minimize power from the base station and the mobile station. Optimization is performed on the following variables:
  • the cost function CF is based upon the following rule performance x quality

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Feedback Control In General (AREA)

Abstract

L'invention concerne une interface air adaptative conçue pour être utilisée dans un système de télécommunications cellulaire. Ladite interface air contient divers types d'éléments d'information présentant des paramètres de fonctionnement telles que les données de verrouillage de trame, les données de synchronisation, des données d'information et des données de correction des erreurs. L'interface air adaptative selon l'invention comporte des moyens pour collecter les spécifications relatives aux paramètres, des moyens pour rattacher les conditions relatives aux paramètres à un espace d'entrée, des moyens pour transformer l'espace d'entrée en espace de sortie, lequel définit les paramètres de fonctionnement de l'interface air. Les moyens de transformations comprennent, de préférence, un régisseur de logique floue.
EP97914742A 1996-04-29 1997-03-24 Interface air adaptative Withdrawn EP0898830A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9601617A SE515509C2 (sv) 1996-04-29 1996-04-29 Adaptivt luftgränssnitt
SE9601617 1996-04-29
PCT/SE1997/000498 WO1997041675A1 (fr) 1996-04-29 1997-03-24 Interface air adaptative

Publications (1)

Publication Number Publication Date
EP0898830A1 true EP0898830A1 (fr) 1999-03-03

Family

ID=20402373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97914742A Withdrawn EP0898830A1 (fr) 1996-04-29 1997-03-24 Interface air adaptative

Country Status (4)

Country Link
EP (1) EP0898830A1 (fr)
AU (1) AU2187697A (fr)
SE (1) SE515509C2 (fr)
WO (1) WO1997041675A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI973439A7 (fi) * 1997-08-21 1999-02-22 Nokia Networks Oy Menetelmä parantaa radiopuhelinjärjestelmän ilmarajapinnan suorituskykyä
FI115361B (fi) * 2000-12-28 2005-04-15 Nokia Corp Menetelmä linkkiadaptaation suorittamiseksi
US7321614B2 (en) 2003-08-08 2008-01-22 Intel Corporation Apparatus and methods for communicating using symbol-modulated subcarriers
US7394858B2 (en) 2003-08-08 2008-07-01 Intel Corporation Systems and methods for adaptive bit loading in a multiple antenna orthogonal frequency division multiplexed communication system
US8824582B2 (en) 2003-08-08 2014-09-02 Intel Corporation Base station and method for channel coding and link adaptation
US7649833B2 (en) 2003-12-29 2010-01-19 Intel Corporation Multichannel orthogonal frequency division multiplexed receivers with antenna selection and maximum-ratio combining and associated methods
US7333556B2 (en) 2004-01-12 2008-02-19 Intel Corporation System and method for selecting data rates to provide uniform bit loading of subcarriers of a multicarrier communication channel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2592256B1 (fr) * 1985-12-20 1988-02-12 Trt Telecom Radio Electr Dispositif d'asservissement de la puissance d'emission d'un faisceau hertzien
US5425051A (en) * 1992-11-09 1995-06-13 Norand Corporation Radio frequency communication network having adaptive parameters
US5446756A (en) * 1990-03-19 1995-08-29 Celsat America, Inc. Integrated cellular communications system
DE69231437T2 (de) * 1991-12-26 2001-03-01 Nec Corp., Tokio/Tokyo System zur Steuerung der Sendeleistung mit Gewährleistung einer konstanten Signalqualität in einem Mobilkommunikationsnetzwerk

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9741675A1 *

Also Published As

Publication number Publication date
SE9601617L (sv) 1997-10-30
SE9601617D0 (sv) 1996-04-29
SE515509C2 (sv) 2001-08-20
WO1997041675A1 (fr) 1997-11-06
AU2187697A (en) 1997-11-19

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