WO1996037082A1 - Accroissement de la capacite d'un reseau telephonique mobile cellulaire - Google Patents

Accroissement de la capacite d'un reseau telephonique mobile cellulaire Download PDF

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Publication number
WO1996037082A1
WO1996037082A1 PCT/FI1996/000237 FI9600237W WO9637082A1 WO 1996037082 A1 WO1996037082 A1 WO 1996037082A1 FI 9600237 W FI9600237 W FI 9600237W WO 9637082 A1 WO9637082 A1 WO 9637082A1
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WO
WIPO (PCT)
Prior art keywords
cell
frequency
sub
frequency group
carrier
Prior art date
Application number
PCT/FI1996/000237
Other languages
English (en)
Inventor
Harri Posti
Original Assignee
Nokia Telecommunications Oy
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 Nokia Telecommunications Oy filed Critical Nokia Telecommunications Oy
Priority to AU55036/96A priority Critical patent/AU5503696A/en
Publication of WO1996037082A1 publication Critical patent/WO1996037082A1/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
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • 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
    • H04W16/02—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
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures

Definitions

  • the present invention relates to a cellular mobile telephone network, in which each cell is allocated specific frequencies differing from those of neighbouring cells, in such a manner that the same frequencies recur in other cells according to a frequency reuse factor.
  • One basic idea of a cellular mobile telephone system is to use the limited frequency band of the system in such a manner that required capacity can be provided despite the limited number of frequencies. This is carried out by establishing cells. A cell does not have the use of all the frequencies of the system, but a specific group of frequencies. Neighbouring cells do not have the use of the frequencies of the frequency group of this cell, but these frequencies are only used in a cell which is located sufficiently far from the cell concerned. Signal strengths have thus decreased sufficiently between the cells using the same frequencies, co-channel interference being also sufficiently low and not causing disturbance on the radio channel . The procedure where frequencies are distributed according to the above-mentioned principle is referred to as frequency reuse.
  • the above-described procedure is essential in cellular design, which aims at selecting the cell size and the number of system parameters, such as frequency allocation and cellular capacity, in such a manner that such a continuous coverage is achieved economically that supports the required traffic intensity.
  • Factors to be taken into account in cellular design are thus traffic intensity in different areas, the greatest transmission power of mobile stations, and interference.
  • frequency reuse factor related to the use of frequencies depends on the cellular design of the operator, and interference restrictions also set a limit to the frequency reuse factor.
  • the frequency reuse factor has a significant effect on the efficiency of the spectrum. The smaller the frequency reuse factor, the more efficiently the frequency spectrum is used.
  • the frequency reuse factor is determined on the basis of relative interference levels, C/I levels, in which C is the level of a received carrier and I is the interference level .
  • the factor C is affected by the used handover strategy, the power control of mobile stations, discontinuous transmission DTX, and frequency hopping.
  • a cell is allocated a dedicated frequency group, i.e. a particular number of carriers of a particular frequency, and the frequency reuse factor indicates how far from this cell the same frequencies are reused. Even though a cell is allocated a specific number of carriers, this does not mean that all the carriers are used. Accordingly, if the capacity of the cell is to be increased, it can be normally increased by starting to use more carriers from the frequency group of the cell.
  • the allocated frequency spectrum sets an upper limit to the highest achievable network capacity.
  • Figure 1 is a schematic representation of a geographical area covered by the cells of a cellular network.
  • the cells are of the same size and that they can be represented by circles which have the same radius; base stations BTS indicated by black circles are located in the center of a cell; and the distance from a base station to another is d.
  • the frequency reuse factor is 4, from which follows the known fact that four frequency groups are needed: frequency group A, frequency group B, frequency group C, and frequency group D.
  • the same frequency group can thus recur in such a manner that a cell of another frequency group is located between cells of the same frequency group, for instance in the manner shown in the figure.
  • the carrier frequency is thus reused at a distance D.
  • the frequency band required by the exemplifying system of the figure would be 1.6 MHz.
  • the object of the present invention is a cellular network in which, contrary to known networks, the capacity can be increased without enlarging the frequency band.
  • At least one carrier of the frequency group of a cell is transmitted at a lower power than the highest allowed transmission power of the base station, the radio coverage of the lower-power carrier thus establishing a sub-cell within the mother cell.
  • a mobile station When a mobile station is located within the sub- cell, it is allocated a traffic channel the frequency of which is the frequency of the lower carrier, and when a mobile station is located outside the sub-cell but within the mother cell, it is allocated a traffic channel the frequency of which is the frequency of a high-power carrier.
  • a handover is performed in which the mobile station is allocated a traffic channel which uses a lower-power or, correspondingly, a higher- power carrier.
  • Figure 1 shows the cells of a cellular network and their frequency groups when the frequency reuse factor is 4,
  • Figure 2 shows the cells of the cellular network of the invention.
  • the cellular network of Figure 2 principally corresponds to Figure 1, and the same references are used where applicable.
  • the radius of the cell is R, and it is the carrier range of the frequency group A, beyond which signal strength deteriorates fast below an acceptable value and beyond which the carrier of the base station of a neighbouring cell is more audible.
  • the signal strength of the carrier is great as far as at the cell border and also at some distance within the area of a neighbouring cell, and this is why neighbouring cells are not allocated the same frequencies.
  • the power of the transmitter of at least one carrier is adjusted in such a manner that the coverage of the carrier is about half of the cell.
  • the power of the carrier is thus a part power of the highest allowable power.
  • the carrier must not be the BCCH carrier, which is continuously broadcast at the highest allowable capacity according to the specifications.
  • the cell with the radius r constitutes a sub- cell 1, and the actual cell with the radius R will be referred to as the mother cell below.
  • the area 1 of the sub-cell is indicated by oblique strokes in the figure, and the area 2 of the mother cell, which the sub-cell does not cover, is indicated by a white area.
  • the area 2 is an annular area.
  • a frequency group a comprising at least one carrier frequency is employed within the area of the sub-cell 1, the transmission power of the carrier/carriers being lowered.
  • the other frequency group A of the cell consists of carriers the transmission power maximum of which is the highest allowable one.
  • the mobile station which is located within the area of the sub-cell 1 of the cell SI, is allocated a traffic channel from the frequency group a, the frequency of which traffic channel is the frequency of the lower-power carrier.
  • the power of the carrier of the traffic channel is adjusted according to normal power regulation, in such a manner, however, that the maximum power is no more than the above-mentioned part power.
  • an intercellular handover in performed in a manner known as such.
  • the traffic is transferred to a channel of the cell S2, the power maximum of the carrier of the frequency group C of which covers the entire area of the cell S2.
  • an intracellular handover is performed again, and the traffic is transferred to a channel the carrier of which belongs to a frequency group c, the maximum power thus being a part power of the highest allowable transmission power.
  • the carrier frequency is selected again from the frequency group C.
  • an intercellular handover is performed again according to the criteria characteristic of the network, and the traffic of the mobile station is transferred to a carrier of the frequency group B.
  • the power of the carriers of this frequency group may be the highest maximum power allowable to the cell .
  • an intracellular handover is performed, and the radio channel is transferred to a carrier of the frequency group a.
  • the transmission power of the carriers of the group a is lowered.
  • the frequency groups of the sub-cells of the cells SI and S3 are the same, i.e. the frequency group a.
  • the carrier k of the frequency group a arriving from the sub-cell 1' ' of the cell S3 , has attenuated sufficiently when arriving at the mobile station, the C/I ratio being thus sufficiently great.
  • the frequencies would be reused only at a distance D from one another.
  • the frequency group of each cell comprises two carriers, one of them could be used as a lower-power carrier to establish a sub-cell, and the other carrier could be used as a BCCH carrier, which must cover the area of the entire cell, as is known. If a frequency group comprises several carriers, desired carriers can be selected to be lower-power carriers, which can be used for communication within the sub-cell and which can be reused at a shorter distance than the frequency group of maximum power carriers.
  • the frequency reuse factor can be reduced as regards these carriers in accordance with the above.
  • the same carriers can be used in the sub-cells of the cells SI and S2, while the inference caused by them does not grow too high due to the lowered maximum power.
  • the frequency reuse factor is 3 in the example of Figure 2, since the same carriers are reused at a distance D2, which is approximately the same as three times the radius R of the cell. If a cell is provided with two carriers and one of them is a lower-power carrier, the required bandwidth is 1.4 MHz. The bandwidth required of a prior art network using two carriers per cell is 1.6 MHz, the improvement being thus significant .
  • the presented solution is suitable for use in connection with any known cellular network. Since the number of intracellular handovers increases, it must be taken into account in an appropriate manner in network planning and in handover algorithms. It may be necessary to develop a new algorithm and new parameters for network configuration.

Landscapes

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

Abstract

Cette invention concerne un réseau téléphonique mobile cellulaire dans lequel au moins une porteuse du groupe de fréquences d'une cellule est transmise à une puissance inférieure à la puissance de transmission maximale autorisée de la station de base, la couverture radio de la porteuse de moindre puissance permettant ainsi d'établir une sous-cellule (1) dans la cellule mère S1. Lorsqu'une station mobile se trouve dans la sous-cellule (1), on lui attribue un canal de trafic dont la fréquence est celle de la porteuse de moindre puissance. Lorsqu'une station mobile se trouve hors (2) de la sous-cellule mais dans la cellule mère, on lui attribue un canal de trafic dont la fréquence est celle d'une porteuse de grande puissance. Lorsque la station mobile entre dans une sous-cellule ou, de la même manière, sort de celle-ci, on procède à un transfert durant lequel on attribue à la station mobile un canal de trafic faisant appel à une porteuse de moindre puissance ou, inversement, d'une puissance supérieure. Le facteur de réutilisation de fréquence peut ainsi être réduit en ce qui concerne les porteuses de puissance moindre.
PCT/FI1996/000237 1995-05-18 1996-04-30 Accroissement de la capacite d'un reseau telephonique mobile cellulaire WO1996037082A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU55036/96A AU5503696A (en) 1995-05-18 1996-04-30 Increasing capacity in a cellular mobile telephone network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI952429A FI952429A (fi) 1995-05-18 1995-05-18 Kapasiteetin kasvattaminen solukkorakenteisessa matkapuhelinverkossa
FI952429 1995-05-18

Publications (1)

Publication Number Publication Date
WO1996037082A1 true WO1996037082A1 (fr) 1996-11-21

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Country Status (3)

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AU (1) AU5503696A (fr)
FI (1) FI952429A (fr)
WO (1) WO1996037082A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
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
WO1998052364A2 (fr) * 1997-05-16 1998-11-19 Nextel Communications, Inc. Procede de maximisation de l'indice d'occupation spectrale d'un systeme de communications cellulaire
WO1999038272A2 (fr) * 1998-01-21 1999-07-29 Plantronics, Inc. Communication a faible portee par induction magnetique
WO2001017300A1 (fr) * 1999-08-30 2001-03-08 Telefonaktiebolaget Lm Ericsson (Publ) Reduction d'aeration cellulaire dans un reseau cellulaire
GB2360907A (en) * 2000-03-29 2001-10-03 Crown Castle Uk Ltd Digital data transmission
US6456844B1 (en) 1996-12-19 2002-09-24 Nokia Telecommunications Oy Method for admission control in interference-limited cellular radio network
US6658257B1 (en) * 1998-05-08 2003-12-02 Ntt Docomo, Inc. Radio communication system, frequency allocation method and frequency allocation device
WO2005086381A1 (fr) * 2004-03-05 2005-09-15 Samsung Electronics Co., Ltd. Procede et systeme d'allocation de ressources de frequence bases sur des facteurs de reutilisation de frequence multiple dans des systemes de communication cellulaire
WO2008057791A1 (fr) * 2006-10-27 2008-05-15 Qualcomm Incorporated Principe d'attribution de puissance
EP1471754A3 (fr) * 2003-04-24 2009-03-11 Nokia Siemens Networks Oy Solution dynamique de couverture et capacité pour un réseau radio cellulaire
EP1937011B1 (fr) * 2006-12-20 2017-08-23 Sagemcom Broadband Sas Procédé et disposition de gestion dynamique de sous-secteurs dans un système de communication cellulaire

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0531090A2 (fr) * 1991-09-03 1993-03-10 Nippon Telegraph And Telephone Corporation Motif de réutilisation pour cellules dans un système de communication mobile
WO1995008896A1 (fr) * 1993-09-21 1995-03-30 Telstra Corporation Limited Station de base pour systeme de telecommunications mobiles
EP0662776A2 (fr) * 1994-01-07 1995-07-12 Alcatel SEL Aktiengesellschaft Extention de cellule dans un système cellulaire de radiocommunications AMRT
EP0667726A2 (fr) * 1994-02-14 1995-08-16 Matsushita Electric Industrial Co., Ltd. Réglage de puissance lors d'un transfert d'appel dans un système de radiocommunication cellulaire mobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0531090A2 (fr) * 1991-09-03 1993-03-10 Nippon Telegraph And Telephone Corporation Motif de réutilisation pour cellules dans un système de communication mobile
WO1995008896A1 (fr) * 1993-09-21 1995-03-30 Telstra Corporation Limited Station de base pour systeme de telecommunications mobiles
EP0662776A2 (fr) * 1994-01-07 1995-07-12 Alcatel SEL Aktiengesellschaft Extention de cellule dans un système cellulaire de radiocommunications AMRT
EP0667726A2 (fr) * 1994-02-14 1995-08-16 Matsushita Electric Industrial Co., Ltd. Réglage de puissance lors d'un transfert d'appel dans un système de radiocommunication cellulaire mobile

Cited By (21)

* Cited by examiner, † Cited by third party
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
US6456844B1 (en) 1996-12-19 2002-09-24 Nokia Telecommunications Oy Method for admission control in interference-limited cellular radio network
WO1998052364A2 (fr) * 1997-05-16 1998-11-19 Nextel Communications, Inc. Procede de maximisation de l'indice d'occupation spectrale d'un systeme de communications cellulaire
WO1998052364A3 (fr) * 1997-05-16 1999-03-18 Nextel Communications Procede de maximisation de l'indice d'occupation spectrale d'un systeme de communications cellulaire
US5953661A (en) * 1997-05-16 1999-09-14 Nextel Communications Method of maximizing spectral efficiency in a cellular communications system
WO1999038272A3 (fr) * 1998-01-21 1999-12-16 Plantronics Communication a faible portee par induction magnetique
WO1999038272A2 (fr) * 1998-01-21 1999-07-29 Plantronics, Inc. Communication a faible portee par induction magnetique
US6658257B1 (en) * 1998-05-08 2003-12-02 Ntt Docomo, Inc. Radio communication system, frequency allocation method and frequency allocation device
US7082310B2 (en) 1998-05-08 2006-07-25 Ntt Mobile Communications Networks, Inc. Radio communication system, frequency allocation method and frequency allocation device
WO2001017300A1 (fr) * 1999-08-30 2001-03-08 Telefonaktiebolaget Lm Ericsson (Publ) Reduction d'aeration cellulaire dans un reseau cellulaire
GB2360907A (en) * 2000-03-29 2001-10-03 Crown Castle Uk Ltd Digital data transmission
WO2001073984A2 (fr) * 2000-03-29 2001-10-04 Crown Castle Uk Limited Transmission de donnees numeriques
WO2001073984A3 (fr) * 2000-03-29 2002-06-27 Crown Castle Uk Ltd Transmission de donnees numeriques
EP1471754A3 (fr) * 2003-04-24 2009-03-11 Nokia Siemens Networks Oy Solution dynamique de couverture et capacité pour un réseau radio cellulaire
US8023951B2 (en) 2003-04-24 2011-09-20 Nokia Siemens Networks Oy Dynamic coverage and capacity solution for cellular radio network
WO2005086381A1 (fr) * 2004-03-05 2005-09-15 Samsung Electronics Co., Ltd. Procede et systeme d'allocation de ressources de frequence bases sur des facteurs de reutilisation de frequence multiple dans des systemes de communication cellulaire
AU2005219905B2 (en) * 2004-03-05 2008-07-24 Qualcomm Incorporated Method and system for allocating frequency resources based on multiple frequency reuse factors in cellular communication systems
JP2010508718A (ja) * 2006-10-27 2010-03-18 クゥアルコム・インコーポレイテッド 電力割当スキーム
US7818023B2 (en) 2006-10-27 2010-10-19 Qualcomm Incorporated Power allocation scheme
WO2008057791A1 (fr) * 2006-10-27 2008-05-15 Qualcomm Incorporated Principe d'attribution de puissance
EP1937011B1 (fr) * 2006-12-20 2017-08-23 Sagemcom Broadband Sas Procédé et disposition de gestion dynamique de sous-secteurs dans un système de communication cellulaire

Also Published As

Publication number Publication date
FI952429A (fi) 1996-11-19
FI952429A0 (fi) 1995-05-18
AU5503696A (en) 1996-11-29

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