WO2003021810A1 - Commande de puissance dans des communications radiomobiles - Google Patents

Commande de puissance dans des communications radiomobiles Download PDF

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Publication number
WO2003021810A1
WO2003021810A1 PCT/NZ2002/000167 NZ0200167W WO03021810A1 WO 2003021810 A1 WO2003021810 A1 WO 2003021810A1 NZ 0200167 W NZ0200167 W NZ 0200167W WO 03021810 A1 WO03021810 A1 WO 03021810A1
Authority
WO
WIPO (PCT)
Prior art keywords
power
power level
data
call
saving scheme
Prior art date
Application number
PCT/NZ2002/000167
Other languages
English (en)
Inventor
Clive Douglas Horn
Ian Douglas Royds
Original Assignee
Tait Electronics Limited
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 Tait Electronics Limited filed Critical Tait Electronics Limited
Publication of WO2003021810A1 publication Critical patent/WO2003021810A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This invention relates to the control of power levels during transmissions by mobile radios, particularly but not only to power control in digital radio systems such as those proposed under DIIS (Digital Interchange of Information and Signalling).
  • DIIS Digital Interchange of Information and Signalling
  • DIIS has proposed autonomous and dynamic power control schemes of each kind.
  • DIIS is a digital radio standard that involves status signalling between radio units.
  • a sender unit called the signalling master, announces channel status with a channel status signal, and may announce changes to status with payload, reservation or idle signals.
  • the invention involves use of a power saving scheme with normally reduced levels of transmission power, but with transmission of signals relating to channel status at substantially increased power, preferably full power.
  • the invention may broadly be said to consist in a method of power control for a mobile node in a radio communication system, comprising: transmitting data on a channel at a power level that is determined by a power saving scheme, and transmitting at a higher power level when the data contains one or more kinds of signalling information.
  • the invention consists in a method of collision avoidance in a non-central radio communication system, comprising: setting up a call between two or more mobile nodes in the system, transmitting data from one of the nodes to the others using a reduced transmission range determined by a power saving scheme, and increasing the power level and the transmission range when transmitting data of one or more predetermined kinds.
  • the invention consists in a mobile unit for a radio communications system, comprising: a controller that operates a power saving scheme for the unit, and a transmitter that transmits data at a power level determined by the power saving scheme, wherein the power level is increased over that determined by the power saving scheme when one or more predetermined kinds of data are transmitted.
  • the predetermined data is preferably signalling information such as channel status information.
  • Channel status may be indicated in a variety of ways including specific status messages, forward or reverse signalling, and payload, reservation or idle telegrams in the case of DIIS.
  • Figure 1 shows relatively high power transmissions between a pair of mobile units
  • Figure 2 shows relatively low power transmissions between the units and the potential for a collision with transmission by a another unit
  • Figure 3 shows collision avoidance through transmission of selected signalling at substantially full power
  • FIG. 4 shows a typical frame structure that might occur under DIIS
  • FIG. 5 shows a typical mobile unit including power control components
  • Figure 6 outlines power variation at a sender unit
  • Figure 7 outlines power variation at a receiver unit.
  • Figure 1 shows a simple scenario in which two nodes A and B of a peer-to-peer communication system are in a call and are alternately transmitting at full power.
  • the solid arrow indicates an instance at which node A is transmitting to node B.
  • An observer node C wishes to set up a call to a more remote node D using the same channel, as indicated by the dashed arrow.
  • the observer C can detect the transmissions between A and B and will not transmit until the channel is available. Note that the transmission radii are indicative only. In a real propagation environment, the areas covered by the transmissions of each node will be irregular.
  • FIG 2 some form of power saving is being deployed in the call between nodes A and B and their transmission levels are reduced.
  • Various known power control schemes may be used by either node. They reduce the power level of the transmitting node so that a satisfactory signal can be detected at the receiving node, without extending the range of the transmission unnecessarily to cover area beyond the receiving node.
  • the more distant observer C in this case can no longer detect the transmissions by A or B on the required channel. Observer C therefore assumes that the channel is available and commences a call to D.
  • the call by C is typically set up at full power and causes a collision in the power controlled call between A and B.
  • Figure 3 shows an improved scenario in which some of the transmissions by node A are made at relatively high power in order to alert node C and other observers that a call is underway. Most of the transmissions by A may still occur at reduced power in accord with a power saving scheme.
  • Node B may adopt the same or a similar scheme and may also make at least some transmissions at relatively high power.
  • the observer C detects the relatively high power transmissions and is aware of the call between A and B. Observer C refrains from transmitting and reduces the likelihood of a collision. In general, an observer must wait for at least one complete frame before attempting a new call.
  • the high power transmissions by node A in Figure 3 may be structured in various ways. Preferably they are made at substantially full power and are limited to signals involving channel status. However, a range of power levels may be implemented in relation to a range of signal types, or other predetermined kinds of signal.
  • the sender A will be announcing the channel status with a channel status signal, and may also announce a change in the channel status with a payload header, payload terminator, reservation or idle telegram. These signals may be transmitted at full power while payload signals are transmitted in accord with a power saving scheme.
  • Node B may adopt a similar range of power levels and will preferably match that of node A.
  • Figure 4 shows a frame structure that is currently proposed for DIIS.
  • the frame contains 36 slots with various signalling possibilities, including forward and reverse channel signalling FS and RS, channel status CS, payload header and terminator PH and PT, and transmit interrupts TI.
  • Reverse channel signalling has several uses including instructions from a receiving radio for the sending radio to increase power, while forward channel signalling may be used in response to a control instruction. Transmit interrupts may allow an observer radio to interrupt the current transmission.
  • data in the channel status CS, payload header and terminator slots is transmitted at full power by node A, while data in the reverse signalling slot RS is transmitted at full power by node B.
  • Payload transmissions are transmitted according to an autonomous, dynamic or other power saving scheme, of which a range are available or proposed. Payload transmissions may be data of any kind, derived from speech input by a user or received from a computer based source.
  • the power saving schemes generally take account of factors such as signal strength, interference and battery power in setting or instructing power levels for calls between pairs or larger groups of mobile units.
  • the preferred embodiment is generally but not only applicable to non-central or peer-to- peer networks. These networks may involve both direct and repeater-based communication between the units. They may provide one or more multi-access channels for the units.
  • FIG. 5 shows a typical mobile unit used in radio communications, in which some of the power related components have been indicated.
  • the unit includes a main controller 10 that is responsible for most functions of the unit, and a transmit power controller 11 that is generally part of the main controller. Program instructions and data required by the controller are stored in memory 12.
  • a rechargeable battery 13 powers the unit.
  • the main controller is connected by a bus 14 to the battery, a keypad 15, display 16 and a battery charge indicator 17.
  • the radio unit in Figure 5 includes transmitter and receiver blocks 20, 21 connected to an antenna through a coupler 23. Either simplex or duplex operation may be possible.
  • a power amplifier 24 determines the output magnitude of the transmitter, both under control of the power controller 11. Power saving schemes are implemented by the power controller and the main controller, by varying the transmitter output magnitude and power on/off state of the radio as a whole.
  • An audio processing component 26 connects a microphone and a speaker to the transmitter and receiver respectively.
  • Figure 6 is a flow diagram that illustrates how the power level of transmissions by a sender unit may be varied during a call in DIIS. The transmissions are determined by the main controller in step 30, generally slot by slot of a frame such as shown in Figure 4.
  • Transmissions for which the output power level is to be set at a relatively high predetermined level are assessed in steps 31-34. If the transmissions relate to channel status or other kinds of signalling then the power level is set to full in step 35, otherwise the level is set according to an appropriate power saving algorithm in step 36. The transmission is then sent in step 37.
  • Figure 7 is a flow diagram that illustrates how the power level of transmissions by a receiver in a call with a sender unit may be varied.
  • the transmissions are determined by the main controller in step 40, slot by slot of a frame. If a transmission includes signalling data, generally only reverse signalling data in step 41, then the output power level is set to a relatively high level in step 42, preferably full power. Otherwise the power level is set according to a power saving algorithm in step 43. The transmission is sent in step 44.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système de commande de puissance, destiné à des unités radiomobiles, permettant d'apporter une assistance en économie d'énergie pour les batteries et en suppression de conflit d'accès. Pour la plupart des émissions, on utilise un schéma d'économie d'énergie avec des niveaux normalement réduits de puissance d'émission, mais dans le cas d'émission d'au moins un type de données, typiquement des données de signalisation, notamment des données d'état de canal, le niveau de puissance est sensiblement accru, de préférence jusqu'à pleine puissance. Les unités ne participant pas à un appel, mais qui se trouvent dans la zone de pleine puissance de unités participant à l'appel, peuvent détecter qu'un appel est en progression et ainsi éviter ou réduire la probabilité de provoquer un conflit d'accès.
PCT/NZ2002/000167 2001-09-04 2002-08-29 Commande de puissance dans des communications radiomobiles WO2003021810A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ513942A NZ513942A (en) 2001-09-04 2001-09-04 Power control in mobile radio communications
NZ513942 2001-09-04

Publications (1)

Publication Number Publication Date
WO2003021810A1 true WO2003021810A1 (fr) 2003-03-13

Family

ID=19928680

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2002/000167 WO2003021810A1 (fr) 2001-09-04 2002-08-29 Commande de puissance dans des communications radiomobiles

Country Status (2)

Country Link
NZ (1) NZ513942A (fr)
WO (1) WO2003021810A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2128385A2 (fr) 2008-05-16 2009-12-02 Frontier Wind, LLC. Éolienne dotée de déflecteurs d'air déployables

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998028859A1 (fr) * 1996-12-04 1998-07-02 Nokia Telecommunications Oy Procede de production d'une onde porteuse de canaux semaphores et systeme radio
WO1999052230A1 (fr) * 1998-04-03 1999-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Informations de signalisation de messages de communication dans un systeme cellulaire possedant une structure etroite de reutilisation de frequence
US6047189A (en) * 1996-10-11 2000-04-04 Arraycomm, Inc. Adaptive method for channel assignment in a cellular communication system
EP1067705A1 (fr) * 1999-07-09 2001-01-10 Sony International (Europe) GmbH Extension de la couverture d'une cellule dans des systèmes de communication radio dont la liaison descendante est controlée en puissance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6047189A (en) * 1996-10-11 2000-04-04 Arraycomm, Inc. Adaptive method for channel assignment in a cellular communication system
WO1998028859A1 (fr) * 1996-12-04 1998-07-02 Nokia Telecommunications Oy Procede de production d'une onde porteuse de canaux semaphores et systeme radio
WO1999052230A1 (fr) * 1998-04-03 1999-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Informations de signalisation de messages de communication dans un systeme cellulaire possedant une structure etroite de reutilisation de frequence
EP1067705A1 (fr) * 1999-07-09 2001-01-10 Sony International (Europe) GmbH Extension de la couverture d'une cellule dans des systèmes de communication radio dont la liaison descendante est controlée en puissance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2128385A2 (fr) 2008-05-16 2009-12-02 Frontier Wind, LLC. Éolienne dotée de déflecteurs d'air déployables

Also Published As

Publication number Publication date
NZ513942A (en) 2001-09-28

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