WO1994029972A1 - Process for improving frequency allocation in a cellular mobile radio system with multiple power supply - Google Patents
Process for improving frequency allocation in a cellular mobile radio system with multiple power supply Download PDFInfo
- Publication number
- WO1994029972A1 WO1994029972A1 PCT/EP1994/001537 EP9401537W WO9429972A1 WO 1994029972 A1 WO1994029972 A1 WO 1994029972A1 EP 9401537 W EP9401537 W EP 9401537W WO 9429972 A1 WO9429972 A1 WO 9429972A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- frequency allocation
- radio system
- mobile radio
- cellular mobile
- power supply
- Prior art date
Links
Classifications
-
- 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
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/12—Fixed resource partitioning
-
- 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
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
-
- 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
- H04W16/24—Cell structures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
Definitions
- the invention relates to a method for improved frequency allocation with minimized adjacent channel interferences in a cellular mobile radio system with multiple coverage.
- the available frequency or channel groups should be able to be reused as often as possible in the area for different connections Channel repetition).
- it must be ensured that both co-channel and adjacent-channel interference, which can cause interference in connections, remain as low as possible.
- An arrangement of cells that contains all occurring channel groups and that can be repeated periodically in the area is called a cluster.
- DE-P 41 41 398.9 proposes to improve the coverage of the individual cells by illuminating a cell from three different fixed stations with sector antennas. These three base stations each use the same channel group. This results in a more even illumination of the cell. Furthermore, using overlapping sector antennas at a base station creates a cluster with overlapping cells.
- Soft handover This results from the fact that the mobile station moves within a cell from one fixed station to another. The mobile station is essentially supplied by the strongest base station. The mobile station does not notice anything of this soft handover, since all three base stations use the same channel group.
- the radio network architecture with overlapping sectors considered here provision is therefore made for adjacent, overlapping sectors to be occupied with non-adjacent frequencies. This keeps the adjacent channel interference as low as possible.
- the method accordingly contains an optimized frequency allocation for the above-described basic radio network architecture with hexagonal cells.
- the base station uses all available frequency groups, there are no overlaps of cells with adjacent frequency groups in different radio network architectures of the type described. While a cluster in the original definition was determined by the fact that each frequency group was represented only once, each frequency group is now used several times within a cluster.
- the frequency allocation for the individual overlapping sectors can be obtained by a special optimization of the frequency allocation, which ensures that the frequencies are as far apart as possible in the overlaps.
- the selection of the frequencies can be derived by cyclically interchanging the frequency groups and by rotating and mirroring the arrangement.
- Figure 1 a 3-cell cluster with non-optimized
- FIG. 2 a 3-cell cluster according to FIG. 1 without showing the overlaps
- FIG. 3 a 3-cell cluster with optimized frequency allocation according to the invention
- FIG. 4 a 3-cell cluster according to Figure 3 without showing the overlaps
- FIG. 5 a 4-cell cluster with optimized frequency allocation according to the invention
- FIG. 6 a 4-cell cluster according to FIG. 5 without showing the overlaps
- Adjacent numbers mean adjacent frequency groups in all drawings. The greater the difference between the numbers, the greater the distance between the frequencies.
Abstract
The description relates to a process for improving frequency allocation in a cellular mobile radio system with multiple coverage for a radio system architecture of a multiple cell cluster with mutually overlapping hexagonal cells, in which each hexagonal cell is covered simulteanously from three of its corners by fixed stations with the same frequency group, whereby overlapping sectors are covered by non-adjacent frequencies.
Description
Verfahren zur verbesserten FrequenzZuweisung bei einem zellularen Mobilfunksystem mit MehrfachversorgungMethod for improved frequency allocation in a cellular mobile radio system with multiple coverage
l. Die Erfindung betrifft ein Verfahren zur verbesserten FrequenzZuweisung mit minimierten Nachbarkanal-Inter¬ ferenzen bei einem zellularen Mobilfunksystem mit Mehr¬ fachversorgung.l. The invention relates to a method for improved frequency allocation with minimized adjacent channel interferences in a cellular mobile radio system with multiple coverage.
Um in einem Mobilfunknetz eine möglichst hohe Teilnehmer¬ kapazität zu erzielen, sollen die zur Verfügung stehenden Frequenz- bzw. Kanalgruppen möglichst häufig in der Fläche für unterschiedliche Verbindungen wiederbenutzt werden können, also in räumlich möglichst dicht benach- barten Zellen wiederholt werden (Frequenz- bzw. Kanalwie¬ derholung, engl. Channel reuse) . Dabei muß andererseits sichergestellt werden, da/3 sowohl Gleichkanal- als auch Nachbarkanalstörungen, welche Störungen von Ver¬ bindungen hervorrufen können, möglichst gering bleiben. Eine Anordnung von Zellen, welche sämtliche vorkommenden Kanalgruppen beinhaltet und die sich lückenlos periodisch in der Fläche wiederholen lässt, wird Cluster genannt.In order to achieve the highest possible subscriber capacity in a mobile radio network, the available frequency or channel groups should be able to be reused as often as possible in the area for different connections Channel repetition). On the other hand, it must be ensured that both co-channel and adjacent-channel interference, which can cause interference in connections, remain as low as possible. An arrangement of cells that contains all occurring channel groups and that can be repeated periodically in the area is called a cluster.
2. In der DE-P 41 41 398.9 wird vorgeschlagen, die Ver- sorgung der einzelnen Zellen dadurch zu verbessern, da/3 eine Zelle von drei verschiedenen Feststationen mit Sektorantennen ausgeleuchtet wird. Diese drei Fest¬ stationen verwenden jeweils die gleiche Kanalgruppe. Damit wird eine gleichmässigere Ausleuchtung der Zelle erreicht. Desweiteren entsteht durch Verwendung von sich überlappenden Sektorantennen an einer Feststation ein Cluster mit sich überlappenden Zellen.2. DE-P 41 41 398.9 proposes to improve the coverage of the individual cells by illuminating a cell from three different fixed stations with sector antennas. These three base stations each use the same channel group. This results in a more even illumination of the cell. Furthermore, using overlapping sector antennas at a base station creates a cluster with overlapping cells.
Innerhalb einer solchen Konfiguration gibt es zwei Formen des Handover. Erstens einen impliziten oder
"weichen" Handover, der dadurch entsteht, da/3 sich die Mobilstation innerhalb einer Zelle von einer Fest¬ station zu einer anderen bewegt. Die Versorgung der Mobilstation wird dabei im wesentlichen von der stärksten Feststation übernommen. Von diesem weichen Handover merkt die Mobilstation nichts, da alle drei Fest¬ stationen die gleiche Kanalgruppe verwenden.There are two types of handover within such a configuration. First, an implicit or "Soft" handover, which results from the fact that the mobile station moves within a cell from one fixed station to another. The mobile station is essentially supplied by the strongest base station. The mobile station does not notice anything of this soft handover, since all three base stations use the same channel group.
Zweitens gibt es einen konventionellen Handover mit Kanalwechsel im Uberlappungsbereich von benachbarten Zellen. Da diese Überlappungsbereiche nicht mit den Sektorgrenzen oder herkömmlichen Funkzonengrenzen zusammenfallen, ist dieser Handover weder unsicher noch zeitkritisch.Second, there is a conventional handover with a channel change in the overlap area of neighboring cells. Since these overlap areas do not coincide with the sector boundaries or conventional radio zone boundaries, this handover is neither uncertain nor time-critical.
3. Es ist die Aufgabe der vorliegenden Erfindung, ein Verfahren bereitzustellen, in dem die Nachbarkanal- Interferenzen auf ein Minimum herabgesetzt werden.3. It is the object of the present invention to provide a method in which the adjacent channel interference is reduced to a minimum.
Diese Aufgabe wird durch die technische Lehre des Anspruchs 1 gelöst, in dem ein neuartiges Verfahren zur FrequenzZuteilung für eine Funknetzarchitektur bean¬ sprucht wird.This object is achieved by the technical teaching of claim 1, in which a novel method for frequency allocation for a radio network architecture is claimed.
Es ist somit im Fall der hier betrachteten Funknetz¬ architektur mit sich überlappenden Sektoren vorgesehen, benachbarte, sich überlappende Sektoren mit nicht¬ benachbarten Frequenzen zu belegen. Dadurch werden die auftretenden Nachbarkanal-Interferenzen so gering wie möglich gehalten. Das Verfahren beinhaltet demnach eine optimierte FrequenzZuweisung für die oben be¬ schriebene grundsätzliche Funknetzarchitektur mit hexa¬ gonalen Zellen.
Obwohl die Basisstation alle vorhandenen Frequenz¬ gruppen verwendet, treten in unterschiedlichen Funk¬ netz-Architekturen des beschriebenen Typs keine Über¬ lappungen von Zellen mit benachbarten Frequenzgruppen auf. Während ein Cluster in der ursprünglichen Definition dadurch bestimmt war, daß jede Frequenzgruppe nur einmal vertreten war, wird jetzt innerhalb eines Clusters jede Frequenzgruppe mehrfach verwendet.In the case of the radio network architecture with overlapping sectors considered here, provision is therefore made for adjacent, overlapping sectors to be occupied with non-adjacent frequencies. This keeps the adjacent channel interference as low as possible. The method accordingly contains an optimized frequency allocation for the above-described basic radio network architecture with hexagonal cells. Although the base station uses all available frequency groups, there are no overlaps of cells with adjacent frequency groups in different radio network architectures of the type described. While a cluster in the original definition was determined by the fact that each frequency group was represented only once, each frequency group is now used several times within a cluster.
Die FrequenzZuweisung für die einzelnen sich über¬ lappenden Sektoren kann durch eine spezielle Optimierung der FrequenzZuweisung gewonnen werden, die sicherstellt, daß in den Überlappungen die Frequenzen möglichst weit auseinanderliegen. Die Auswahl der Frequenzen kann durch zyklische Vertauschung der Frequenzgruppen sowie durch Rotation und Spiegelungen der Anordnung abgeleitet werden.The frequency allocation for the individual overlapping sectors can be obtained by a special optimization of the frequency allocation, which ensures that the frequencies are as far apart as possible in the overlaps. The selection of the frequencies can be derived by cyclically interchanging the frequency groups and by rotating and mirroring the arrangement.
Die Erfindung soll anhand von Ausführungsbeispielen mit Hinweis auf die beiliegenden Zeichnungen erläutert werden.The invention will be explained using exemplary embodiments with reference to the accompanying drawings.
Es bedeuten:It means:
Figur 1: ein 3-Zell-Cluster mit nichtoptimierterFigure 1: a 3-cell cluster with non-optimized
Frequenzzuteilung nach dem Stand der Technik;Frequency allocation according to the prior art;
Figur 2: ein 3-Zell-Cluster gemäss Figur 1 ohne Dar¬ stellung der Überlappungen;FIG. 2: a 3-cell cluster according to FIG. 1 without showing the overlaps;
Figur 3: ein 3-Zell-Cluster mit optimierter Frequenz¬ zuteilung gemäss der Erfindung;FIG. 3: a 3-cell cluster with optimized frequency allocation according to the invention;
Figur 4: ein 3-Zell-Cluster gemäss Figur 3 ohne Dar- Stellung der Überlappungen;
Figur 5: ein 4-Zell-Cluster mit optimierter Frequenz¬ zuteilung gemäss der Erfindung;Figure 4: a 3-cell cluster according to Figure 3 without showing the overlaps; FIG. 5: a 4-cell cluster with optimized frequency allocation according to the invention;
Figur 6: ein 4-Zell-Cluster gemäss Figur 5 ohne Dar¬ stellung der Überlappungen;FIG. 6: a 4-cell cluster according to FIG. 5 without showing the overlaps;
Figur 7: eine alternative FrequenzZuteilung für dasFigure 7: an alternative frequency allocation for the
4-Zell-Cluster gemäss Figur 5 ohne Darstellung der Überlappungen;4-cell cluster according to FIG. 5 without illustration of the overlaps;
Figur 8: eine andere FrequenzZuteilung für dasFigure 8: another frequency allocation for that
4-Zell-Cluster gemäss Figur 5 ohne Darstellung der Überlappungen.4-cell cluster according to FIG. 5 without illustration of the overlaps.
Benachbarte Zahlen bedeuten in allen Zeichnungen benach¬ barte Frequenzgruppen. Je größer der Unterschied zwischen den Zahlen ist, umso größer ist der Abstand der Frequenzen zueinander.Adjacent numbers mean adjacent frequency groups in all drawings. The greater the difference between the numbers, the greater the distance between the frequencies.
In dem ersten Ausführungsbeispiel der vorliegenden Erfindung ist eine nicht-optimierte Frequenzzuteilung für eine Funknetzarchitektur mit 2 x 3 Frequenzgruppen darge¬ stellt.In the first embodiment of the present invention, a non-optimized frequency allocation for a radio network architecture with 2 x 3 frequency groups is shown.
Alle in den Unterlagen offenbarten Angaben und Merkmale, insbesondere die in den Zeichnungen dargestellte Frequenz¬ gruppenzuweisung, werden als erfindungwesentlich bean¬ sprucht, soweit sie gegenüber dem Stand der Technik neu sind.
All of the information and features disclosed in the documents, in particular the frequency group assignment shown in the drawings, are claimed to be essential to the invention insofar as they are new compared to the prior art.
Claims
1. Verfahren zur verbesserten FrequenzZuweisung bei einem zellularen Mobilfunksystem mit Mehrfachver¬ sorgung für eine Funknetzarchitektur eines Mehrfach- Zell-Clusters mit einander überlappenden hexagonalen Zellen, wobei jede hexagonale Zelle gleichzeitig von drei ihrer Ecken durch Feststationen mit der gleichen Frequenzgruppe versorgt wird, d a d u r c h g e k e n n z e i c h n e t, daß die sich überlappen¬ den Sektoren mit nichtbenachbarten Frequenzen belegt werden.1. A method for improved frequency allocation in a cellular mobile radio system with multiple coverage for a radio network architecture of a multiple cell cluster with overlapping hexagonal cells, each hexagonal cell being supplied simultaneously from three of its corners by base stations with the same frequency group, characterized in that the overlapping sectors are occupied with non-adjacent frequencies.
2. Verfahren zur verbesserten FrequenzZuweisung bei einem zellularen Mobilfunksystem nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß die Frequenzen, die den benachbarten sich überlappen¬ den Sektoren zugewiesen werden, durch zyklische Vertauschung der Frequenzgruppen sowie durch Rotation und Spiegelungen der Anordnung abgeleitet werden. 2. A method for improved frequency allocation in a cellular mobile radio system as claimed in claim 1, which also means that the frequencies which are assigned to the adjacent overlapping sectors are derived by cyclically interchanging the frequency groups and by rotating and mirroring the arrangement.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU69276/94A AU6927694A (en) | 1993-06-04 | 1994-05-12 | Process for improving frequency allocation in a cellular mobile radio system with multiple power supply |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4318495A DE4318495C2 (en) | 1993-06-04 | 1993-06-04 | Method for improved frequency allocation in a cellular mobile radio system with multiple coverage |
DEP4318495.2-35 | 1993-06-04 |
Publications (1)
Publication Number | Publication Date |
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WO1994029972A1 true WO1994029972A1 (en) | 1994-12-22 |
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ID=6489579
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Application Number | Title | Priority Date | Filing Date |
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PCT/EP1994/001537 WO1994029972A1 (en) | 1993-06-04 | 1994-05-12 | Process for improving frequency allocation in a cellular mobile radio system with multiple power supply |
Country Status (3)
Country | Link |
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AU (1) | AU6927694A (en) |
DE (1) | DE4318495C2 (en) |
WO (1) | WO1994029972A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2313742A (en) * | 1996-05-28 | 1997-12-03 | Motorola Inc | Channel allocation in a cellular communication system |
US6127988A (en) * | 1998-05-05 | 2000-10-03 | Nortel Networks Limited | Fixed wireless base station antenna arrangement |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9508639D0 (en) * | 1995-04-28 | 1995-06-14 | Ionica Int Ltd | Frequency assignment in a cellular radio telecommunications network |
US5850608A (en) * | 1996-11-08 | 1998-12-15 | Nothern Telecom Limited | Directional frequency assignment in a cellular radio system |
US6424836B1 (en) * | 1999-02-09 | 2002-07-23 | Innowave Eci Wireless Systems Ltd. | Method for allocating frequency channels for sectors of a cell in cellular systems |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991003911A1 (en) * | 1989-09-05 | 1991-03-21 | Motorola, Inc. | Cellular radiotelephone communications system |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CA1061412A (en) * | 1973-05-15 | 1979-08-28 | Marion L. Cunningham | Mobile communication system and method employing directional service area coverage |
DE3110347C2 (en) * | 1980-03-24 | 1983-07-21 | Western Electric Co., Inc., 10038 New York, N.Y. | Process and device for effective use of the frequency spectrum in mobile radio systems |
DE3411014A1 (en) * | 1984-03-24 | 1985-09-26 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | MESSAGE TRANSFER SYSTEM |
US5212830A (en) * | 1991-05-31 | 1993-05-18 | International Mobile Machines Corporation | Radio frequency communications system |
DE4141398C2 (en) * | 1991-12-16 | 1994-01-20 | Detecon Gmbh | Method for improving the radio cell illumination in a cellular mobile radio system and device for carrying out the method |
-
1993
- 1993-06-04 DE DE4318495A patent/DE4318495C2/en not_active Expired - Lifetime
-
1994
- 1994-05-12 WO PCT/EP1994/001537 patent/WO1994029972A1/en active Application Filing
- 1994-05-12 AU AU69276/94A patent/AU6927694A/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991003911A1 (en) * | 1989-09-05 | 1991-03-21 | Motorola, Inc. | Cellular radiotelephone communications system |
Non-Patent Citations (1)
Title |
---|
S. HEERALALL ET AL: "High capacity cellular patterns for land mobile radio systems using directionnal antennas", I.E.E PROCEEDINGS, vol. 136, no. 1, February 1989 (1989-02-01), STEVENACE, HERTS (GB), pages 75 - 80, XP000007119 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2313742A (en) * | 1996-05-28 | 1997-12-03 | Motorola Inc | Channel allocation in a cellular communication system |
US6127988A (en) * | 1998-05-05 | 2000-10-03 | Nortel Networks Limited | Fixed wireless base station antenna arrangement |
Also Published As
Publication number | Publication date |
---|---|
AU6927694A (en) | 1995-01-03 |
DE4318495A1 (en) | 1994-12-08 |
DE4318495C2 (en) | 1999-09-02 |
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