WO2001078251A2 - Verfahren zur sendeleistungsregelung in einem funk-kommunikationssystem - Google Patents
Verfahren zur sendeleistungsregelung in einem funk-kommunikationssystem Download PDFInfo
- Publication number
- WO2001078251A2 WO2001078251A2 PCT/DE2001/001401 DE0101401W WO0178251A2 WO 2001078251 A2 WO2001078251 A2 WO 2001078251A2 DE 0101401 W DE0101401 W DE 0101401W WO 0178251 A2 WO0178251 A2 WO 0178251A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- connection quality
- connections
- connection
- target sir
- individual
- Prior art date
Links
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
- H04W52/06—TPC algorithms
- H04W52/12—Outer and inner loops
-
- 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
- H04W52/18—TPC being performed according to specific parameters
- H04W52/20—TPC being performed according to specific parameters using error rate
-
- 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
- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/226—TPC being performed according to specific parameters taking into account previous information or commands using past references to control power, e.g. look-up-table
-
- 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
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
Definitions
- the so-called DS-CDMA or "Direct Sequence Code Division Multiple Access” method is used as the multiplex method, ie a CDMA method with a direct sequence.
- the efficiency of this process i.e. the number of subscribers that can be supplied or the total throughput that can be achieved per radio cell depends to a large extent on an optimally set fast power control (PC: Power Control).
- Such a power control typically consists of a fast inner and closed control loop (inner loop), in each case in an uplink (uplink) and in a downlink (downlink), and of an outer control loop (outer loop).
- inner loop inner loop
- outer loop outer loop
- the outer control loop specifies the setpoint for the fast inner loop. This setpoint is calculated from the currently measured bit error rate (BER: Bit Error Rate) or block error rate (BLER: Block Erasure Rate) and the required one
- BER Bit Error Rate
- BLER Block Erasure Rate
- Target SIR signal-to-interference ratio
- the invention has for its object to provide a method and a radio communication system that enable better capacity optimization. This object is achieved by the method with the features of claim 1, the radio communication system with the features of claim 12 or stations according to claim 13 for such a communication system.
- the performance of the performance regulation depends centrally on an optimally chosen target SIR. This can be shown by computer simulations. Furthermore, such simulations have shown that the optimal target SIR is not a fixed value for a given radio propagation environment, but depends on the current load in the radio network (see also FIG. 2).
- the capacity of a CDMA radio network can thus be optimized if the target SIR for the power control is set depending on the system load in accordance with the simulation results shown.
- the advantage of a central component in the target SIR control is the increased responsiveness of the network to rapid load changes, e.g. when a high-speed data service enters the cell through a handover.
- Changing the desired connection quality value for one or more individual connections offers the advantage of improving the average connection quality of a large number of connections in the overall system.
- connection quality of the plurality of connections can even be improved, although the desired connection quality value for the individual connection or a part of the plurality of connections deteriorates.
- look-up table from which they can be taken accordingly.
- the look-up table can be created in a first method step by simulations and / or by measurements of actual connections. It is also particularly advantageous that the look-up table can also be created or updated during operation, so that later adaptations to changing conditions in the system or in a radio cell can be taken into account.
- the design and handling of the values in the look-up table is particularly simple if it contains optimized ratio values of desired connection quality values compared to a connection quality measured during operation - in particular interference - of the large number of connections, since such values are already taken into account in the existing standards and are therefore only a simple extension existing systems and equipment is required. This also applies in particular to the determination of the average connection quality of the multiplicity of connections by measuring the total throughput and the quality of service of the multiplicity of connections with temporary variations of the supposedly ideal values for checking them.
- Connection is responsible. Since a separate algorithm for the outer control loop is active for each connection, each connection is controlled individually in the event of a load change. This ultimately leads to very sluggish behavior. By centrally influencing the above-mentioned method, however, it is also possible to act very quickly on the individual compounds. Better quality is not possible for every single connection, but for a large part of the connections.
- stations for a radio communication system expediently have a change device for detecting an average connection quality of a plurality of connections and for changing the desired connection quality values for their individual connection (s) in order to improve the average connection quality of a large number of their own and / or other connections in their radio range.
- FIG. 1 shows a block diagram of a radio communication system, in particular a mobile radio system
- FIG. 2 shows a diagram to clarify the ratio of
- FIG. 3 is a block diagram of an exemplary implementation of the inner and outer control loop in one
- a mobile radio system consists of a large number of mobile switching centers MSC, which belong to a switching network (SSS - Switching Subsystem) and are networked with one another or provide access to a fixed network, and one or more base station systems BSS (BSS - Base Station Subsystem) connected to these mobile switching centers MSC.
- a base station system BSS in turn has at least one device RNC (RNC - Radio Network (-0> ho t P> P 1
- TPC Transmitter Power Control
- FIG 3 shows, by way of example, an implementation of the combination of an inner control loop and an outer control loop in a power control device X of a transceiver of the base station BS or of the subscriber station MS.
- the received signals are filtered in a so-called matched filter MF and fed to a detector device RC.
- the detector device RC is designed as a known RAKE combiner.
- a signal-interference ratio SIR is determined from the signals detected and supplied by the detector device RC in a SIR determination device ISIR.
- the signal-interference ratio SIR is used for fast transmission power control as the basis for an optimal transmission power setting, since the interference situation at the receiver is the most important criterion for secure reception of the signals.
- the received signals are decoded in a decoder VC, for example a Viterbi decoder, which is connected downstream of the detector device RC.
- a quality value BER characteristic of the respective connection is subsequently determined in a quality determination device MBER.
- the characteristic value is averaged (-0> t P>P> o cn onon ⁇ y ⁇ y
- the lookup tables LU can e.g. can be obtained by simulations as were used to create the diagrams in FIG. 2.
- the target SIR can be shifted in small steps compared to the optimal value according to the simulation or existing LU lookup table.
- the target SIR values of a large number or all connections are shifted simultaneously by small amounts.
- detailed measurements of the total throughput and quality of service are carried out. If these variables increase with the variation, the target SIR is no longer optimal for the entirety of the connections and is adjusted in a subsequent step.
- the lookup table LU can also be corrected in particular. In other words, a poorer connection quality is accepted here for individual connections in order to ultimately achieve a better quality for the entirety of the connections.
- the block diagram for power control has one or more further inputs I x , into which values of the current total interference or the current total load proportional to it are entered for a large number or preferably all connections.
- the look-up table LU described above is entered in order to determine a correction value for the target SIR.
- the value of the target bit error rate is ultimately changed via, for example, an adder or a multiplication device. This directly affects the outer and indirectly the inner control loop.
- the last-mentioned method steps can in particular also take place in a single device which has one or more inputs for the current load value (s) and one or more look-up tables LU for determining a suitable target value, which is then used with the respective value from the devices Determination of the mean values for the bit error rate or the like is processed.
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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 (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01940138A EP1273107B1 (de) | 2000-04-11 | 2001-04-10 | Verfahren zur sendeleistungsregelung in einem funk-kommunikationssystem |
KR1020027013569A KR20020089446A (ko) | 2000-04-11 | 2001-04-10 | 무선 통신 시스템에서의 송신 전력 제어 방법 |
JP2001574997A JP2003530757A (ja) | 2000-04-11 | 2001-04-10 | 無線通信システムにおける送信電力の制御方法 |
DE50107050T DE50107050D1 (de) | 2000-04-11 | 2001-04-10 | Verfahren zur sendeleistungsregelung in einem funk-kommunikationssystem |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10017930A DE10017930A1 (de) | 2000-04-11 | 2000-04-11 | Verfahren zur Sendeleistungsregelung in einem Funk-SIGMAommunikationssystem |
DE10017930.4 | 2000-04-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001078251A2 true WO2001078251A2 (de) | 2001-10-18 |
WO2001078251A3 WO2001078251A3 (de) | 2002-04-11 |
Family
ID=7638327
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/001401 WO2001078251A2 (de) | 2000-04-11 | 2001-04-10 | Verfahren zur sendeleistungsregelung in einem funk-kommunikationssystem |
Country Status (6)
Country | Link |
---|---|
US (1) | US20030156554A1 (de) |
EP (1) | EP1273107B1 (de) |
JP (1) | JP2003530757A (de) |
KR (1) | KR20020089446A (de) |
DE (2) | DE10017930A1 (de) |
WO (1) | WO2001078251A2 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003079576A2 (en) * | 2002-03-14 | 2003-09-25 | Qualcomm, Incorporated | Method and apparatus for reducing interference with outer loop power control in a wireless communication system |
WO2004084479A1 (en) * | 2003-03-17 | 2004-09-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Dual loop signal quality based link adaptation |
EP1563631A2 (de) * | 2002-11-08 | 2005-08-17 | Interdigital Technology Corporation | Zusammengesetzte kanalqualitätsschätzungstechniken für drahtloseempfänger |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6622024B2 (en) * | 2001-09-20 | 2003-09-16 | Interdigital Technology Corporation | Outer loop transmit power control using channel-adaptive processing |
JP4569287B2 (ja) * | 2004-12-15 | 2010-10-27 | 日本電気株式会社 | 無線通信装置、その送信電力制御方法及びプログラム |
US20080139235A1 (en) * | 2004-12-22 | 2008-06-12 | Claes Tidestav | Method and Arrangement for Improved Outer Loop Power Control |
EP1734668B1 (de) * | 2005-06-17 | 2008-08-27 | Fujitsu Limited | Leistungsregelung im Mehrstreckenkommunikationssystem |
EP2369879A3 (de) * | 2005-06-17 | 2011-11-09 | Fujitsu Limited | Kommunikationssystem |
EP1734665B1 (de) * | 2005-06-17 | 2011-08-10 | Fujitsu Limited | Mehrstrecken-Kommunikationssystem |
EP1734666A1 (de) * | 2005-06-17 | 2006-12-20 | Fujitsu Limited | Verwaltung von Betriebsmitteln im Mehrstreckenkommunikationssystem |
US7756543B2 (en) * | 2005-09-09 | 2010-07-13 | Telefonaktiebolaget Lm Ericsson (Publ) | High speed shared radio channel transmit power control |
EP1801995A1 (de) * | 2005-12-21 | 2007-06-27 | Fujitsu Limited | Signalisierung in Mehrsprungkommunikationssystemen |
GB0619454D0 (en) * | 2006-10-02 | 2006-11-08 | Fujitsu Ltd | Communication systems |
GB2443464A (en) * | 2006-11-06 | 2008-05-07 | Fujitsu Ltd | Signalling in a multi-hop communication systems |
GB2447883A (en) * | 2007-03-02 | 2008-10-01 | Fujitsu Ltd | Bandwidth allocation in multi-hop wireless communication systems |
GB2447635A (en) * | 2007-03-19 | 2008-09-24 | Fujitsu Ltd | Scheduling qos communications between nodes within a predetermined time unit in wimax systems |
US20090141661A1 (en) * | 2007-11-29 | 2009-06-04 | Nokia Siemens Networks Oy | Residual traffic state for wireless networks |
Citations (2)
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EP0548939A2 (de) * | 1991-12-26 | 1993-06-30 | Nec Corporation | System zur Steuerung der Sendeleistung mit Gewährleistung einer konstanten Signalqualität in einem Mobilkommunikationsnetzwerk |
EP0853393A1 (de) * | 1996-06-27 | 1998-07-15 | Ntt Mobile Communications Network Inc. | Steuerungsanordnung für übertragte leistung |
Family Cites Families (9)
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ZA946674B (en) * | 1993-09-08 | 1995-05-02 | Qualcomm Inc | Method and apparatus for determining the transmission data rate in a multi-user communication system |
AU3260195A (en) * | 1995-08-31 | 1997-03-19 | Nokia Telecommunications Oy | Method and device for controlling transmission power of a radio transmitter in a cellular communication system |
FI964707A (fi) * | 1996-11-26 | 1998-05-27 | Nokia Telecommunications Oy | Menetelmä kuormituksen kontrolloimiseksi ja radiojärjestelmä |
JPH11355204A (ja) * | 1998-06-04 | 1999-12-24 | Nec Corp | Cdma移動通信システム及びcdma移動通信システムにおける送信電力制御方法 |
US6266531B1 (en) * | 1998-07-01 | 2001-07-24 | Ericsson Inc. | System and method for adaptive thresholds for cell load sharing |
FI107505B (fi) * | 1999-02-16 | 2001-08-15 | Nokia Networks Oy | Pääsynvalvontamenetelmä |
US6463296B1 (en) * | 1999-02-16 | 2002-10-08 | Telefonaktiebolaget L M Ericsson (Publ) | Power control in a CDMA mobile communications system |
US6628956B2 (en) * | 1999-03-15 | 2003-09-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Adaptive power control in a radio communications systems |
US6968201B1 (en) * | 1999-10-06 | 2005-11-22 | Lucent Technologies, Inc. | Method and apparatus for controlling reverse link interference rise and power control instability in a wireless system |
-
2000
- 2000-04-11 DE DE10017930A patent/DE10017930A1/de not_active Withdrawn
-
2001
- 2001-04-10 US US10/257,441 patent/US20030156554A1/en not_active Abandoned
- 2001-04-10 JP JP2001574997A patent/JP2003530757A/ja not_active Withdrawn
- 2001-04-10 EP EP01940138A patent/EP1273107B1/de not_active Expired - Lifetime
- 2001-04-10 WO PCT/DE2001/001401 patent/WO2001078251A2/de active IP Right Grant
- 2001-04-10 DE DE50107050T patent/DE50107050D1/de not_active Expired - Lifetime
- 2001-04-10 KR KR1020027013569A patent/KR20020089446A/ko not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0548939A2 (de) * | 1991-12-26 | 1993-06-30 | Nec Corporation | System zur Steuerung der Sendeleistung mit Gewährleistung einer konstanten Signalqualität in einem Mobilkommunikationsnetzwerk |
EP0853393A1 (de) * | 1996-06-27 | 1998-07-15 | Ntt Mobile Communications Network Inc. | Steuerungsanordnung für übertragte leistung |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003079576A2 (en) * | 2002-03-14 | 2003-09-25 | Qualcomm, Incorporated | Method and apparatus for reducing interference with outer loop power control in a wireless communication system |
WO2003079576A3 (en) * | 2002-03-14 | 2003-12-24 | Qualcomm Inc | Method and apparatus for reducing interference with outer loop power control in a wireless communication system |
EP1563631A2 (de) * | 2002-11-08 | 2005-08-17 | Interdigital Technology Corporation | Zusammengesetzte kanalqualitätsschätzungstechniken für drahtloseempfänger |
EP1563631A4 (de) * | 2002-11-08 | 2006-08-02 | Interdigital Tech Corp | Zusammengesetzte kanalqualitätsschätzungstechniken für drahtloseempfänger |
WO2004084479A1 (en) * | 2003-03-17 | 2004-09-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Dual loop signal quality based link adaptation |
US7545866B2 (en) | 2003-03-17 | 2009-06-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Dual loop signal quality based link adaptation |
Also Published As
Publication number | Publication date |
---|---|
DE50107050D1 (de) | 2005-09-15 |
EP1273107B1 (de) | 2005-08-10 |
JP2003530757A (ja) | 2003-10-14 |
WO2001078251A3 (de) | 2002-04-11 |
EP1273107A2 (de) | 2003-01-08 |
DE10017930A1 (de) | 2001-11-15 |
US20030156554A1 (en) | 2003-08-21 |
KR20020089446A (ko) | 2002-11-29 |
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