WO2003107703A1 - Reseau telephonique mobile cellulaire et procedure d'optimisation d'un tel reseau - Google Patents

Reseau telephonique mobile cellulaire et procedure d'optimisation d'un tel reseau Download PDF

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Publication number
WO2003107703A1
WO2003107703A1 PCT/SE2003/000992 SE0300992W WO03107703A1 WO 2003107703 A1 WO2003107703 A1 WO 2003107703A1 SE 0300992 W SE0300992 W SE 0300992W WO 03107703 A1 WO03107703 A1 WO 03107703A1
Authority
WO
WIPO (PCT)
Prior art keywords
telephone network
mobile telephone
pilot
channel
carrier frequency
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/SE2003/000992
Other languages
English (en)
Inventor
Robert Frank
Magnus Sommer
Ulf Nilsson
Ulf Teght
Christian Bergljung
Bo Olsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telia Co AB
Original Assignee
Telia AB
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 Telia AB filed Critical Telia AB
Priority to AU2003239019A priority Critical patent/AU2003239019A1/en
Publication of WO2003107703A1 publication Critical patent/WO2003107703A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [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
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management

Definitions

  • the present invention relates according to a first aspect to a cellular mobile telephone network.
  • the present invention relates to a procedure to optimize a cellular mobile telephone network.
  • the present invention relates to at least one computer program product to optimize a cellular mobile telephone network.
  • the authorities of some countries have demanded that the licensee shall fulfill a criterion for the signal strength of the UMTS pilot channel.
  • the demand means that the signal strength with certain probability, in excess of the promised coverage area, must not be lower than a certain predefined signal level.
  • the problem is, at fulfillment of above mentioned criterion, to build a UMTS-network in an optimal way with regard to, among other things, traffic routing possibilities and the spectrum efficiency.
  • Document WO-Al-00/07318 describes a procedure and a system to allocate power to channels in a requirement based system for the transceiver system of the base station.
  • the aim of the power control is to keep the power of a carrier frequency on a described power. Available power on a carrier frequency is allocated between active channels.
  • the document US-5,901,145 describes handover for a mobile station between a communication system with distributed/spread spectrum and a frequency division/ spacing communication system. This solution uses a pilot channel which is not controlled by the base station. None of the above mentioned documents addresses or presents a solution to the above mentioned problem.
  • the present invention intends to solve the above mentioned problems. This is achieved according to a first aspect with a cellular mobile telephone network according to the patent claim 1.
  • the base station for each cell is allocated a number of carrier frequencies (f ⁇ ( ..., f n ) , where n is an integer, from the frequency band for the mobile telephone network to transmit information to mobile stations within the cell.
  • Carrier frequencies (f if ... , f n ) at/of a cell recur in another cell according to a predefined frequency reusing factor.
  • the pilot channel (f x -pilot-channel) of a carrier frequency (f x ) is allocated a very high share of the for the carrier frequency (f x ) available power.
  • the pilot channels of different carrier frequencies (f ⁇ ,...,f n ) are allocated different power.
  • the f x -pilot-channel is allocated at least 80% of the for the carrier frequency (f x ) available power.
  • Another advantage in this connection is obtained if the f x -pilot-channel is allocated at least 90% of the for the carrier frequency (f x ) available power. In this connection it is also an advantage if the f x -pilot-channel is allocated 100% of the for the carrier frequency (f x ) available power.
  • Another advantage in this connection is obtained if cells on the carrier frequency (f x ) , the pilot channel of which has high power, do not exist in lists over adjacent cells which are distributed to mobile stations in the mobile telephone network.
  • Another object of the present invention is to make a procedure to, from a cost efficiency point of view and with regard to spectrum efficiency, optimize a cellular mobile telephone network, in which the base station (BS) for each cell is allocated a number of carrier frequencies (f ⁇ ,...,f n ), where n is an integer, from the frequency band for/of the mobile telephone network to transmit the information to mobile stations within the cell, and in which carrier frequencies (f ⁇ ,...,f n ) of a cell recur in another cell according to a predefined frequency reusing factor.
  • BS base station
  • n is an integer
  • the procedure includes the steps: to allocate to the pilot channel (f x -pilot- channel) of a carrier frequency (f x ) , where x is an integer and l ⁇ x---n, a very high share of the for the carrier frequency (f x ) available power; and to allocate to the pilot channels of different carrier frequencies (f ⁇ ,...,f n ) different power.
  • a cellular mobile telephone network is obtained which on the one hand fulfils the demand that the signal strength with a certain probability, in excess of the promised coverage area, does not fall below a certain predefined signal level, and on the other hand is optimal with regard to traffic routing possibilities and spectrum efficiency.
  • Another advantage in this connection is obtained if the f x -pilot-channel is allocated at least 70% of the for the carrier frequency (f x ) available power.
  • the f x -pilot-channel is allocated at least 80% of the for the carrier frequency (f x ) available power.
  • Another advantage in this connection is obtained if the f x -pilot-channel is allocated at least 90% of the for the carrier frequency (f x ) available power.
  • the procedure also includes the step: to block the carrier frequency (f x ) for traffic.
  • the procedure also includes the step: to transmit the f x -pilot-channel by means of a simple transmitter.
  • the procedure also includes the step: to route/direct away the traffic from the carrier frequency (f x ) , the pilot channel of which has high power, to other carrier frequencies (fi) , where l ⁇ i ⁇ n and i ⁇ x, by means of inter-frequency handover and/or cell reselection.
  • Another advantage in this connection is obtained if the procedure also includes the step : - not allowing that cells on the carrier frequency (f x ) , the pilot channel of which has high power, exist in lists over adjacent cells which are distributed to mobile stations in the mobile telephone network.
  • the procedure also includes the step:
  • Another purpose of the present invention is to make a computer program product which can directly be loaded down into the internal memory of at least one digital computer.
  • the at least one computer program product includes software code parts to execute the steps according to the procedure according to the present invention when said product/products is/are executed/run on said at least one computer.
  • a cellular mobile telephone network is obtained which on the one hand fulfils the demand that the signal strength with a certain probability, in excess of the promised coverage area, does not fall below a certain predefined signal level, and on the other hand is optimal with regard to traffic routing possibilities and spectrum efficiency.
  • Figure 1 schematically shows the cells of a cellular mobile telephone network and their frequency groups when the frequency reusing factor is 4;
  • Figure 2 shows a flow chart of a procedure to, from a cost efficiency point of view and with regard to spectrum efficiency, optimize a cellular mobile telephone network;
  • Figure 3 shows a flow chart over further steps in the procedure according to Figure 2 according to a first embodiment.
  • Figure 4 shows a flow chart over some further steps in the procedure according to Figure 2 according to a second embodiment.
  • Figure 5 shows a flow chart over a further step in the procedure according to Figure 2 according to a third embodiment.
  • Figure 6 shows a schematic picture over some computer program products according to the present invention.
  • Figure 1 a schematic representation of a geographic area covered by the cells of a cellular mobile telephone network is shown.
  • the cells are of the same size and that they can be represented by circles which have the same radii; the base stations BTS indicated by black circles are located in the center of a cell. The distance from a base station BTS to another one is d.
  • the frequency reusing factor is 4, from which follows the known fact that four frequency groups are needed.
  • the four frequency groups in Figure 1 are frequency group A, frequency group B, frequency group C and frequency group D.
  • the same frequency group consequently can be reused in such a way that a cell of another frequency group is located between cells of the same frequency group, for instance in the in Figure 1 shown way.
  • each frequency group includes two carrier frequencies, at which the total number of carrier frequencies consequently is 8, and assume that one carrier frequency requires a band of 200 kHz such as in the GSM-system. Consequently the in Figure 1 shown system would require a frequency band of 1,6 MHz.
  • the base station (BS) of each cell is allocated a number of carrier frequencies (f ⁇ ,...,f n ), where n is an integer, from the frequency band for the mobile telephone network to transmit information to mobile stations within the cell.
  • the carrier frequencies (f ⁇ ,...,f n ) of a cell recur in another cell according to a predefined frequency reusing factor.
  • the cellular mobile telephone network is characterized in that the pilot channel (f x -pilot-channel) of a carrier frequency (f x ) , where x is an integer and l ⁇ x ⁇ n, is allocated a very high share of the for the carrier frequency (f x ) available power.
  • the cellular mobile telephone network is characterized in that the pilot channels of different carrier frequencies (f ⁇ ,...,f n ) are allocated different power.
  • the cellular mobile telephone network is built in such a way that the f x -pilot-channel of each cell fulfils the license requirement, i.e. the criterion for the signal strength of the UMTS pilot channel.
  • the pilot channels of other carrier frequencies are from a power point of view dimensioned according to the requirements of the market in customary way.
  • the f x -pilot-channel is allocated at least 70% of the for the carrier frequency (f x ) available power.
  • the f x -pilot- channel is allocated at least 80% of the for the carrier frequency (f x ) available power.
  • the f x -pilot- channel is allocated at least 90% of the for the carrier frequency (f x ) available power.
  • the f x -pilot channel is allocated 100% of the for the carrier frequency (f x ) available power.
  • the carrier frequency (f x ) can be blocked for traffic. Then there will be no need to direct/route the traffic to other carrier frequencies in the cell, or to punish the f x -pilot-channel at cell search.
  • Yet another advantage then also is obtained by using a simple, cheap transmitter for the f x -pilot-channel . This implies lower demands on linearity of the transmitter, and no power control.
  • the traffic is routed/directed away from the carrier frequency (f x ) , the pilot channel of which has high power, to other carrier frequencies (fi) , where l ⁇ i ⁇ n and i ⁇ x by means of inter-frequency handover and/or cell reselection.
  • This routing/directing of mobile stations is allowed in the message/report "Physical Channel Reconfiguration", in which UARFCN for the new carrier frequency can be specified. If the message/report is transmitted to a mobile station in the condition CELL_DHC it initiates an inter-frequency handover. If the message/report on the other hand is transmitted to a mobile station in the condition CELL-FACH an inter-frequency cell reselection is initiated.
  • cells on the carrier frequency (f x ) the pilot channel of which has high power do not exist in lists of adjacent cells which are distributed to mobile stations in the mobile telephone network. This prevents already active mobile stations from making handovers/cell reselections to the carrier frequency (f x ) . This applies to/for the lists of adjacent cells which are in (i) the system information on BCH and (ii) in dedicated "Measurement Control"-messages, if any, to specific mobile stations.
  • the cellular mobile telephone network is at cell-search an offset added on the f ⁇ -pilot-channel so that the mobile channels land • up on the carrier frequency (f x ) only within the range where the traffic channel on the carrier frequency (f x ) has service.
  • This can be achieved by parameter setting via system information on BCH.
  • Figure 2 a flow chart is shown of a procedure to, from a cost efficiency point of view and with regard to spectrum efficiency, optimize a cellular mobile telephone network.
  • the base station (BS) for each cell is allocated a number of carrier frequencies (fi, ..., f n ) / where n is an integer, from the frequency band of the mobile telephone network to transmit information to mobile stations within the cell.
  • carrier frequencies (fi, ..., f n ) of/at a cell recur in another cell according to a predefined frequency reusing factor. The procedure starts at the block 10.
  • the procedure then continues, at the block 12, with the step: To allocate to the pilot channel (f ⁇ -pilot-channel) of a carrier frequency (f x ) , where x is an integer l---x ⁇ n, a very high share of the for the carrier frequency (f x ) available power.
  • the procedure continues, at the block 14, with the step: To allocate to pilot channels of different carrier frequencies (f ⁇ ,...,f n ) different power.
  • the procedure then is finished at the block 16.
  • at least 70% of the for the carrier frequency (f x ) available power is allocated to the f x -pilot-channel .
  • At least 80% of the for the carrier frequency (f x ) available power is allocated to the f x -pilot-channel .
  • at least 90% of the for the carrier frequency available power is allocated to f x -pilot-channel .
  • FIG. 3 a flow chart of some further steps of the procedure according to Figure 2 according to a first embodiment is shown. The procedure starts at the block 20. The procedure then continues, at the block 22, with the step: To block the carrier frequency (f x ) for traffic. After that, the procedure continues, at the block 24, with the step: To transmit the f x -pilot- channel by means of a simple transmitter. The procedure then is finished at the block 26.
  • Figure 4 a flow chart of some further steps of the procedure according to Figure 2 according to a second embodiment are shown. The procedure starts at the block 30.
  • the procedure then continues, at the block 32, with the step: To route/direct away the traffic from the carrier frequency (f x the pilot channel of which has high power, to other carrier frequencies (fi) , where l ⁇ i ⁇ n and i ⁇ x by means of inter-frequency handover and/or cell reselection.
  • the procedure continues, at the block 34, with the step: Not allowing that cells on the carrier frequency (f x ) , the pilot channel of which has high power, exist in lists for/of adjacent cells which are distributed to mobile stations in the mobile telephone network.
  • the procedure then is finished at the block 36.
  • a flow chart is shown of yet another step in the procedure according to Figure 2 according to a third embodiment. The procedure starts at the block 40.
  • the procedure then continues, at the block 42, with the step: To, at cell-search, add an offset on/to the f x pilot channel so that the mobile stations land up on the carrier frequency (f x ) only within the range where the traffic channel on the carrier frequency (f x ) has service.
  • FIG 6 a schematic drawing of some computer program products according to the present invention is shown.
  • n pc. computer products 102 ⁇ ,.... 102 n where n is an integer, are shown.
  • the computer program products 102 ⁇ ,. thorough, 102 n can be loaded directly into the internal memory of at least one digital computer lOOi,..., 100 n .
  • n computers are also shown.
  • Each computer program product 102 ⁇ ,. smiling- 102 n includes software code parts to execute a part of, or all, the steps according to Figure 2 when the program product/products 102 ⁇ -. resort, 102 n are run on the computer/computers lOOi,..., lOO n .
  • the computer program products 102 ⁇ ,..., 102 n can, for instance, be in form of diskettes, RAM-disks, magnetic tape, optomagnetic disks or any other suitable products .

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

Abstract

La présente invention se rapporte à une procédure permettant d'optimiser, d'un point de vue du rapport coût-efficacité et de l'utilisation rationnelle du spectre, un réseau téléphonique mobile cellulaire, dans lequel la station de base (BS) de chaque cellule ou la station de base associée à chaque cellule dispose d'un certain nombre de fréquences porteuses (f<sb>1</sb>,, f<sb>n</sb>), où n est un entier, appartenant à la bande de fréquence associée au réseau téléphonique mobile, de manière à permettre la transmission des informations vers des stations mobiles se trouvant à l'intérieur de la cellule. Dans le réseau téléphonique mobile cellulaire, les fréquences porteuses (f<sb>1</sb>,, f<sb>n</sb>) d'une cellule réapparaissent dans une autre cellule conformément à un facteur prédéfini de réutilisation des fréquences. Ladite procédure comprend les étapes suivantes: attribution au canal pilote (f<sb>x</sb> - canal pilote) de fréquence porteuse (f<sb>x</sb>) où x est un entier et 1≤x≤n, d'une part très importante de la puissance disponible pour la fréquence porteuse (f<sb>x</sb>); et attribution aux canaux pilotes de fréquences porteuses différentes (f<sb>1</sb>,, f<sb>n</sb>), d'une puissance différente.
PCT/SE2003/000992 2002-06-13 2003-06-12 Reseau telephonique mobile cellulaire et procedure d'optimisation d'un tel reseau Ceased WO2003107703A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003239019A AU2003239019A1 (en) 2002-06-13 2003-06-12 A cellular mobile telephone network and a procedure to optimize it

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0201804A SE525586C2 (sv) 2002-06-13 2002-06-13 Ett cellulärt mobiltelefonnät samt ett förfarande för att optimera detsamma
SE0201804-2 2002-06-13

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WO2003107703A1 true WO2003107703A1 (fr) 2003-12-24

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AU (1) AU2003239019A1 (fr)
SE (1) SE525586C2 (fr)
WO (1) WO2003107703A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2071736A1 (fr) 2007-12-14 2009-06-17 Vodafone Group PLC Procédé d'amélioration de capacité dans un réseau de communication
EP2071735A1 (fr) 2007-12-14 2009-06-17 Vodafone Group PLC Procédé d'amélioration de couverture dans un réseau de communication
CN111245503A (zh) * 2020-01-17 2020-06-05 东南大学 一种卫星通信与地面通信的频谱共享方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5341397A (en) * 1992-04-13 1994-08-23 Telefonaktiebolaget L M Ericsson CDMA frequency allocation
US5758090A (en) * 1995-09-22 1998-05-26 Airnet Communications, Inc. Frequency reuse planning for CDMA cellular communication system by grouping of available carrier frequencies and power control based on the distance from base station
US5901145A (en) * 1997-02-28 1999-05-04 Telefonaktiebolaget L M Ericsson (Publ) Mobile station handoff between a spread spectrum communications system and a frequency division communications system
US6188906B1 (en) * 1997-12-30 2001-02-13 Samsung Electronics Co., Ltd. Method for coverage optimization of multi-frequency assignment system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5341397A (en) * 1992-04-13 1994-08-23 Telefonaktiebolaget L M Ericsson CDMA frequency allocation
US5758090A (en) * 1995-09-22 1998-05-26 Airnet Communications, Inc. Frequency reuse planning for CDMA cellular communication system by grouping of available carrier frequencies and power control based on the distance from base station
US5901145A (en) * 1997-02-28 1999-05-04 Telefonaktiebolaget L M Ericsson (Publ) Mobile station handoff between a spread spectrum communications system and a frequency division communications system
US6188906B1 (en) * 1997-12-30 2001-02-13 Samsung Electronics Co., Ltd. Method for coverage optimization of multi-frequency assignment system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2071736A1 (fr) 2007-12-14 2009-06-17 Vodafone Group PLC Procédé d'amélioration de capacité dans un réseau de communication
EP2071735A1 (fr) 2007-12-14 2009-06-17 Vodafone Group PLC Procédé d'amélioration de couverture dans un réseau de communication
CN111245503A (zh) * 2020-01-17 2020-06-05 东南大学 一种卫星通信与地面通信的频谱共享方法

Also Published As

Publication number Publication date
AU2003239019A1 (en) 2003-12-31
SE525586C2 (sv) 2005-03-15
SE0201804L (sv) 2003-12-14
SE0201804D0 (sv) 2002-06-13

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