WO2002098017A1 - Procede de controle de puissance d'emission - Google Patents
Procede de controle de puissance d'emission Download PDFInfo
- Publication number
- WO2002098017A1 WO2002098017A1 PCT/FR2002/001808 FR0201808W WO02098017A1 WO 2002098017 A1 WO2002098017 A1 WO 2002098017A1 FR 0201808 W FR0201808 W FR 0201808W WO 02098017 A1 WO02098017 A1 WO 02098017A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base station
- power
- threshold
- mobile terminal
- radio signals
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims description 25
- 238000004891 communication Methods 0.000 claims abstract description 29
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 230000008054 signal transmission Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 4
- YZSCPLGKKMSBMV-UHFFFAOYSA-N 5-fluoro-4-(8-fluoro-4-propan-2-yl-2,3-dihydro-1,4-benzoxazin-6-yl)-N-[5-(1-methylpiperidin-4-yl)pyridin-2-yl]pyrimidin-2-amine Chemical compound FC=1C(=NC(=NC=1)NC1=NC=C(C=C1)C1CCN(CC1)C)C1=CC2=C(OCCN2C(C)C)C(=C1)F YZSCPLGKKMSBMV-UHFFFAOYSA-N 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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
- H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
-
- 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
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
Definitions
- the present invention relates to radiocommunications with mobiles, and more particularly to methods of controlling the transmission power of mobile terminals.
- transmission power control limits the transmission power of mobiles close to a base station to prevent the signals they transmit from masking the signals from more distant mobiles.
- power control methods use servo loops: the base station makes measurements on the signal received from a mobile (power, signal-to-interferers ratio (C / l), ...) , and transmits commands to increase or reduce power on the downlink in order to reach a given quality objective. These methods cannot be used before a radio link is established between the base station and the mobile. In particular, they do not allow the mobiles on standby to determine the power level at which they must send their possible random access requests.
- these control loops are not operational, since the base station has not received any prior signal from the mobile terminal enabling the required measurements to be made.
- the mobile terminal estimates the power of these first signals according to another procedure based on the attenuation of the signals transmitted by the base station and received by the mobile terminal.
- the base station broadcasts a beacon signal indicating the power at which it transmitted it.
- the reception of these beacon signals allows the mobile on standby to determine the resources used by the base station with which the link is the best (cell selection) and to assess the attenuation of the signal from this station. It deduces therefrom an initial power of transmission of the radio signals bound for the selected base station, the higher the higher the attenuation.
- the result of this estimation may be a very low transmission power.
- a circumstance is for example a call on the part of a maintenance agent intervening on the base station itself and who uses his radio terminal.
- a radio terminal due to its construction, has a minimum radio transmission power below which it is not capable of transmitting.
- the mobile terminal transmits the random access request with its minimum transmission power (see technical specification 3G TS 25.214, version 3.6.0, published by 3GPP in March 2001, section 6.1, page 27). If this transmission power is significantly higher than the power estimated from the attenuation measurements, this emission risks generating a consequent noise for the other radio signals received by the base station, and thus to harm the quality of transmission of communications in progress to which these other signals belong.
- An object of the present invention is to prevent this nuisance caused by communication with respect to all the others.
- the present invention thus proposes a method for controlling the transmission power of a mobile radio terminal on a communication resource of a base station, the mobile terminal having a minimum power for transmitting radio signals.
- the mobile terminal estimates an initial power of transmission of the radio signals on said resource, compares the difference between its minimum transmission power and the initial power estimated at a predefined threshold, and inhibits the emission of radio signals on said resource if the difference exceeds said threshold.
- the radio signals in question typically carry the random access requests from the mobile terminal. They may nevertheless be of another type (for example coded speech signals in the case of an ongoing telephone call transferred from another base station or another radiocommunication system).
- the mobile terminal is prohibited from accessing the resource of the base station if it is so close to the antenna of the base station that transmission at its minimum power would cause excessive interference for others communications in progress. This excessive level is quantified by the comparison threshold used by the terminal.
- This threshold can vary depending on the type of radio resource. It is thus possible to provide differentiated thresholds as a function of the frequency band used by the base station, of the type of radiocommunication system (in the case of multimode terminals), etc. For each type of resource, the threshold can be a fixed threshold previously recorded in the radio terminal. In case of inhibition of the random access request on a first resource of communication from a base station, the establishment of the communication can possibly be directed towards other resources, presenting a lesser risk of interference with radio communications in progress.
- the value of the aforementioned threshold is included in system information broadcast by the base station and received by the mobile terminal before entering into communication with this base station. It is then a configuration parameter of the base station, adjustable by the operator according to the characteristics of the cell (size, proximity of the antenna with respect to the public road, ). This parameter can also be varied over time (hour of the day, day of the week), or adaptively as a function of the traffic load observed in the cell served by the base station.
- the initial power estimate by the mobile terminal can take into account the attenuation on the downlink: the base station broadcasts a beacon signal at a determined transmission power, and the mobile terminal measures the receive power to estimate the initial transmit power of signals to the base station.
- a mobile terminal comprising means for transmitting radio signals with a transmission power at least equal to a determined minimum power, means for estimating an initial power of transmission of radio signals on a communication resource to enter into communication with a base station, means for comparing the difference between said minimum power and the initial power estimated at a predefined threshold, and means for inhibiting the transmission of radio signals on said resource when the difference exceeds said threshold.
- a third aspect of the invention relates to a radiocommunication base station, comprising means for transmitting and receiving radio signals, in which the transmitting means comprise means for broadcasting system information including the value of a power threshold, so as to prevent mobile terminals located within range of the base station from transmitting radio signals on a resource communication, before the establishment of a radio link with said base station, with a transmission power greater than an initial power estimated by the mobile terminal, increased by the value of said threshold.
- FIG. 1 shows two mobile terminals connected to a base station of a radiocommunication system
- FIG. 2 and 3 are partial block diagrams of a base station and a mobile terminal according to the invention, respectively.
- the invention is described here in its application to the radio access network of a cellular system of UMTS type.
- This access network called UTRAN (“UMTS Terrestrial Radio Access Network”) uses the CDMA technique. It comprises radio network controllers 5 called RNC ("Radio Network Controller") which, via a lub interface, control network nodes called "node B".
- RNC Radio Network Controller
- Each node B comprises one or more base stations 1 each serving one or more cells.
- These base stations communicate by radio with mobile terminals 2, 3 called UE (“User Equipment”) via an interface Uu (see technical specification 3G TS 25.401, version 3.3.0).
- the mobile terminals can be relatively far from the base station, or very close like the mobile terminal 3 shown in FIG. 1.
- Each UE 2, 3 can be in several link states with the UTRAN, managed by a radio resource management protocol (RRC, “Radio Resource Control”) implemented at the RNC level and at the UE level (see 3G TS 25.331 technical specification, version 3.3.0, published in June 2000 by 3GPP, section 9).
- RRC radio resource management protocol
- the UE is in active connection with the radiocommunication system, that is to say in particular that it can send radio signals relating to a call in progress to the base station.
- the transmitting power control loops by the UE are operational. When the UE is powered up and in a selected cell without having any communication in progress with the UTRAN, it is in an idle state.
- the initial selection and cell reselection processes are described in the technical specification 3G TS 25.304, version 3.6.0 published in March 2001 by the 3GPP, section 5.2.
- the UE receives system information transmitted on a broadcast channel (BCH) by the base station of the selected cell (see technical specification 3G TS 25.331, version 3.3.0, section 8.1.1.3).
- BCH broadcast channel
- This system information includes among others: - the transmission power (“Primary CPICH DL TX power”, in dBm) by the base station of a beacon signal on a primary pilot channel called CPICH (“Common Pilot Channel”) (see technical specification 3G TS 25.331, version 3.3.0, sections 10.2.52.6.7, 10.3.6.47 and 10.3.6.52).
- the UE is capable, by subtracting the reception power of the CPICH (CPICH_RSCP) from this transmission power, to estimate the attenuation undergone on the propagation channel;
- FIG. 2 shows schematically the transmission part of the base station 1.
- the CPICH data (see technical specification 3G TS 25.211, version 3.3.0, published in June 2000 by 3GPP, section 5.3.3.1) are produced by a module 11 and amplified in accordance with the “Primary CPICH DL TX power” transmission power specified by the RNC.
- the module 12 inserts the control information to be broadcast on the BCH into the physical channel intended to receive it, called P-CCPCH (“Primary Common Control Physical Channel”, see technical specification 3G TS 25.211, version 3.3.0, section 5.3. 3.2) and applies the corresponding codings.
- This control information, received from the RNC on the BCH transport channel includes in particular the system information mentioned above.
- the CPICH has a “chanellisation” code equal to 1, so that it is directly added to the contributions of the other channels multiplied by their respective “chanellisation” codes c ch ⁇ > c ch 2 , • -. , c ch n .
- the various dedicated channels 13 active in the cell.
- the summed signal delivered by the adder 14 is multiplied by the scrambling code c scr (“scrambling code”) of the cell, applied to the multiplier
- the output of this multiplier 15 is connected to the radio stage 16 of the station, which generates the radio signal emitted by the antenna 17.
- PRACH Physical Random Access Channel
- the module 20 processes the system information decoded on the CCPCH by the reception part 21 of the UE from the radio signal picked up by the antenna 22 and processed by the radio stage 23.
- the receiver 21 also measures the reception power on the CPICH (parameter CPICH_RSCP according to the technical specification 3G TS 25.215, version 3.3.0, published in June 2000 by the 3GPP, section 5.1.1), expressed in dBm.
- the RRC module 20 of the UE estimates a transmission power P ( of this request (“PreambleJnitial_Power”), based on the last measurement of the reception power CPICH_RSCP and the transmit power of the base station on the CPICH as indicated in the system information broadcast. This estimation is carried out as indicated in the technical specification 3G TS 25.331, version 3.3.0, section 8.5.9:
- Preamble_lnitial_Power Primary CPICH DL TX power - CPICHJ SCP + UL interference + Constant Value
- may for example be of the order -70 dBm.
- the latter can only transmit suitably formatted radio signals beyond a determined minimum power P min (for example -50 dBm).
- the transmission part 24 of the UE transmits the random access request on the PRACH channel with the power P mjn .
- the transmitter 24 compares the difference P min - P
- the transmission of the random access request can be done without taking into account the threshold S: the request is sent at max (P min , P
- node B and the RNC On receipt of a random access request, node B and the RNC adopt the standard responses provided in the standard. If communication is to be established, the transmit power of the UE will then be controlled by the previously mentioned loops.
- the MAC module 19 may possibly opt for another radio resource if such resources are available.
- Such an alternative resource cannot be used. find on the same carrier frequency as the one in which the request was refused since the same interference problem would arise. It is preferable that it is not also in an adjacent carrier frequency. find in a separate frequency band.
- the alternative resource can belong to an access network of a type other than UTRAN (for example GSM). This alternative resource can belong to the same base station or to another base station.
- RNC 5 (RRC layer) can vary the threshold S specific to each base station over time.
- the traffic density in the cell served by the base station is relatively high (or when the average C / l ratio is relatively high, which amounts to approximately the same)
- it is generally advantageous to take a low value for the threshold S for example a few dB, while a higher value is acceptable when the traffic density decreases.
- the RNC can thus vary the threshold S according to the time of day and the day of the week. It can also measure the traffic load in the cell and dynamically adapt the value of the threshold S.
- the mobile terminal proceeds as described above before sending the first MAC layer link establishment message.
- the handover fails if the estimated initial power is below the minimum transmit power of the terminal, with a deviation greater than the threshold S of the target cell of the handover.
- the method can generally be applied in any situation where the mobile terminal is required to transmit a first signal to a base station, a signal for which it must estimate the transmission power. It advantageously makes it possible to limit the transmission power of this signal when internal constraints of the terminal do not allow the estimated power for this transmission to be respected.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/479,110 US7228147B2 (en) | 2001-06-01 | 2002-05-29 | Method for controlling transmission power |
EP02738288A EP1393464A1 (fr) | 2001-06-01 | 2002-05-29 | Procede de controle de puissance d'emission |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0107256A FR2825540B1 (fr) | 2001-06-01 | 2001-06-01 | Procede de controle de puissance d'emission d'un terminal radio mobile, terminal mobile et station de base pour la mise en oeuvre de ce procede |
FR01/07256 | 2001-06-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002098017A1 true WO2002098017A1 (fr) | 2002-12-05 |
Family
ID=8863908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/001808 WO2002098017A1 (fr) | 2001-06-01 | 2002-05-29 | Procede de controle de puissance d'emission |
Country Status (4)
Country | Link |
---|---|
US (1) | US7228147B2 (fr) |
EP (1) | EP1393464A1 (fr) |
FR (1) | FR2825540B1 (fr) |
WO (1) | WO2002098017A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1492251A1 (fr) * | 2003-06-24 | 2004-12-29 | Nortel Networks Limited | Procédé de contrôle d'accès à des ressources d'un réseau de radiocommunication et station de base pour la mise en oeuvre du procédé |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1751992A4 (fr) * | 2004-01-27 | 2011-06-08 | Telcordia Tech Inc | Procedes et systemes pour une optimisation automatique dynamique des parametres d'un reseau cdma |
GB2421148B (en) | 2004-12-08 | 2007-04-11 | Motorola Inc | Mobile station,system and method for use in cellular communications |
US7440399B2 (en) * | 2004-12-22 | 2008-10-21 | Qualcomm Incorporated | Apparatus and method for efficient transmission of acknowledgments |
US7742444B2 (en) | 2005-03-15 | 2010-06-22 | Qualcomm Incorporated | Multiple other sector information combining for power control in a wireless communication system |
GB2425019B (en) * | 2005-04-06 | 2009-09-23 | Roke Manor Research | Connection inhibition apparatus and method |
US9055552B2 (en) | 2005-06-16 | 2015-06-09 | Qualcomm Incorporated | Quick paging channel with reduced probability of missed page |
US8750908B2 (en) | 2005-06-16 | 2014-06-10 | Qualcomm Incorporated | Quick paging channel with reduced probability of missed page |
DE602005025470D1 (de) * | 2005-07-07 | 2011-02-03 | Ericsson Telefon Ab L M | Sendeleistungsregelung in einem wahlfreien Zugriffsverfahren |
JP4814332B2 (ja) * | 2005-10-27 | 2011-11-16 | クゥアルコム・インコーポレイテッド | 補足的割当て及び非補足的割当てを処理する方法及び装置 |
US20090207790A1 (en) | 2005-10-27 | 2009-08-20 | Qualcomm Incorporated | Method and apparatus for settingtuneawaystatus in an open state in wireless communication system |
US7783317B2 (en) * | 2005-11-04 | 2010-08-24 | M-Stack Limited | Method and apparatus for calculating an initial transmission power in universal mobile telecommunications system user equipment |
US7881725B2 (en) * | 2006-06-30 | 2011-02-01 | Nokia Corporation | Method and apparatus for providing adaptive thresholding for adjustment to loading conditions |
US8274952B2 (en) * | 2006-10-10 | 2012-09-25 | Alcatel Lucent | Transmission power management |
US10580088B2 (en) * | 2010-03-03 | 2020-03-03 | The Western Union Company | Vehicle travel monitoring and payment systems and methods |
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EP0631397A2 (fr) * | 1993-05-18 | 1994-12-28 | Nec Corporation | Procédé d'allocation de canaux dans un système de radio-téléphone mobile utilisant une commande de la puissance de transmission |
WO1999065158A1 (fr) * | 1998-06-10 | 1999-12-16 | Siemens Aktiengesellschaft | Procede pour maintenir une condition de fonctionnement d'un systeme radiotelephonique mobile, station mobile et station de base |
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US7123600B2 (en) * | 1995-06-30 | 2006-10-17 | Interdigital Technology Corporation | Initial power control for spread-spectrum communications |
FI116112B (fi) * | 1996-11-27 | 2005-09-15 | Hitachi Ltd | Menetelmä ja laitteisto lähetystehon ohjaamiseksi matkaviestinjärjestelmässä |
US6021114A (en) * | 1997-04-18 | 2000-02-01 | Siemens Information And Communication Networks, Inc. | Method and system for utilizing communications lines |
EP1758266A3 (fr) * | 1998-03-03 | 2014-04-23 | NEC Corporation | Procédé de contrôle de la puissance de transmission dans un système de communication mobile de type cellulaire |
CA2324450C (fr) * | 1998-03-23 | 2006-01-03 | Samsung Electronics Co., Ltd. | Dispositif et procede de commande de puissance, servant a commander un canal commun de liaison retour dans un systeme de communication cdma |
CA2314232C (fr) * | 1998-11-09 | 2004-05-11 | Samsung Electronics Co., Ltd. | Acces multiple par reservation dans un systeme de communications cdma |
KR100401191B1 (ko) * | 1999-02-13 | 2003-10-10 | 삼성전자주식회사 | 이동통신시스템의 역방향 링크 송신제어장치 및 방법 |
GB9906198D0 (en) * | 1999-03-18 | 1999-05-12 | Lucent Technologies Inc | Improved random access channel |
JP3343908B2 (ja) * | 1999-06-22 | 2002-11-11 | 日本電気株式会社 | 同報通信方法とそのシステム及びその基地局装置と移動局 |
-
2001
- 2001-06-01 FR FR0107256A patent/FR2825540B1/fr not_active Expired - Fee Related
-
2002
- 2002-05-29 US US10/479,110 patent/US7228147B2/en not_active Expired - Lifetime
- 2002-05-29 EP EP02738288A patent/EP1393464A1/fr not_active Withdrawn
- 2002-05-29 WO PCT/FR2002/001808 patent/WO2002098017A1/fr not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0631397A2 (fr) * | 1993-05-18 | 1994-12-28 | Nec Corporation | Procédé d'allocation de canaux dans un système de radio-téléphone mobile utilisant une commande de la puissance de transmission |
WO1999065158A1 (fr) * | 1998-06-10 | 1999-12-16 | Siemens Aktiengesellschaft | Procede pour maintenir une condition de fonctionnement d'un systeme radiotelephonique mobile, station mobile et station de base |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1492251A1 (fr) * | 2003-06-24 | 2004-12-29 | Nortel Networks Limited | Procédé de contrôle d'accès à des ressources d'un réseau de radiocommunication et station de base pour la mise en oeuvre du procédé |
FR2856876A1 (fr) * | 2003-06-24 | 2004-12-31 | Nortel Networks Ltd | Procede de controle d'acces a des ressources d'un reseau de radiocommunication et de station de base pour la mise en oeuvre de procede |
US7653016B2 (en) | 2003-06-24 | 2010-01-26 | Alcatel Lucent | Method of controlling access to resources of a radiocommunication network and base station for implementing the method |
Also Published As
Publication number | Publication date |
---|---|
US7228147B2 (en) | 2007-06-05 |
EP1393464A1 (fr) | 2004-03-03 |
FR2825540A1 (fr) | 2002-12-06 |
FR2825540B1 (fr) | 2003-08-29 |
US20040152481A1 (en) | 2004-08-05 |
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