WO2001093617A1 - System for indoor cellula networks automatic frequency planning - Google Patents

System for indoor cellula networks automatic frequency planning Download PDF

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Publication number
WO2001093617A1
WO2001093617A1 PCT/IT2001/000092 IT0100092W WO0193617A1 WO 2001093617 A1 WO2001093617 A1 WO 2001093617A1 IT 0100092 W IT0100092 W IT 0100092W WO 0193617 A1 WO0193617 A1 WO 0193617A1
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WO
WIPO (PCT)
Prior art keywords
wos
self
planner
self planner
automatic
Prior art date
Application number
PCT/IT2001/000092
Other languages
French (fr)
Inventor
Federica Evangelista
Stefano Perazzetti
Original Assignee
Telit Networks S.P.A.
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 Telit Networks S.P.A. filed Critical Telit Networks S.P.A.
Priority to AU41038/01A priority Critical patent/AU4103801A/en
Publication of WO2001093617A1 publication Critical patent/WO2001093617A1/en

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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
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic 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
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H04W16/16—Spectrum sharing arrangements between different networks for PBS [Private Base Station] arrangements

Definitions

  • Frequency planning conventional modes are based at employment of tools for coverage prediction where mutual interference matrix between cells, is defined . Such matrix makes up the automatic frequency planning algorithm input.
  • the inconvenience of this application in the indoor scenario is that the simulation coverage tools often lack detailed topographic database and urban clutter able to predict indoor area coverage, thus assigning frequencies in a non-optimum way.
  • Another method used by GSM mobile operators involves a series of measurements in indoor area before WOS installation, and assignment of frequencies. This method is highly reliable because based on measured and not simulated power levels but it requires repeated measurements on site, at each data change in the PLMN. It is also known that the majority of WOS systems implements (ref. Fig. 1), at OMC (3) and BSS (4) levels, a Radio Interference Recording function, which results, processed together with some statistical counters, advice the operator on the adequate change of frequencies in WOS to better radio connection quality.
  • Main purpose of the present invention is to provide a system for automatic frequenc planning and GSM WOS parameters self-configuration in a completely automatic way, without any action from the GSM mobile operator.
  • the Self planner may be combined to all GSM WOS: it always provides the frequency automatic planning feature and the definition of cell parameters data base compliant with the WOS OMC syntax , containing the informations for network data reconfiguring. It is obvious that, to make automatic the network re-configuring, the WOS OMC has to be able to import a cell parameters database in any format. Should this performance not be available, the possibility of manually loading the cell parameters database in the OMC by the system administrator remains.
  • the mobile operator may define, case by case, and according to his needs, if to keep a totally automatic procedure or operate during process phases for a greater control. To this purpose the Self Planners offers various choices, in both procedure and elaboration levels.
  • the Self Planner provides the possibility to elaborate the frequency planning process by simply processing results of Radio Interference Recording and using them as input for planning algorithm, and also by integrating such results with collected measurements.
  • the Self Planner is a system able to accomplish the following operations: a) Monitoring of affiliated operator's network (PLMN) b) Measurement of Received Level Average per Cell (RLA_C) values for each GSM channel reserved to that PLMN c) De-coding and recording of Information Elements transmitted on broadcast control channels: Absolute Radio Frequency Channel Number (ARFCN), Location Area Code (LAC), Cell Identity (CI), Base Station Identity Code (BSIC). Reduced
  • a set of monitors receivers is installed in the indoor area, where WOS is present Monitors (1) are able to perform (a) (b) (c) operations.
  • Monitors (1) are able to perform (a) (b) (c) operations.
  • the monitor with the following parameters: list of down-link channels on which the monitor has to operate;
  • RLA_C Received Level Average per Cell
  • monitors For each WOS, it is possible to install one or more monitors in proximity of each microcell coverage area. Each monitor collects data for frequency planning of one or more microcells, according to its position. Data processing and collection takes place through a computer, the "manager" (2). To transmit collected data, monitors may be connected to the "manager” through dedicated cabling as shown in fig. 2 (wired solution) and/or through radio by equipping monitor and manager with antennas (fig.
  • the manager (2) is a service computer or an OMC CLIENT which manages conditions and time of data collecting procedures of all monitors; afterwards it elaborates frequency planning algorithms.
  • the manager compares measurement sessions received by the monitors and, if needed, detects PLMN frequency plan changes.
  • the manager chooses a group of frequencies which measured power level is below a threshold, considered not interfering and which total number is greater than WOS channels to be planned.
  • two or more groups of frequencies, with higher safe threshold are chosen; this to obtain in each group more and more available frequencies.
  • the manager is able to elaborate the frequency assignment algorithm.
  • the algorithm starts by considering frequencies of Group 1 corresponding to lower interference threshold, thus potentially less interfering and, according to the dimensioning of each cell, assigns first all broadcast channels, afterwards all traffic channels of each micro cell respecting priority order and verifying the re-use restrictions at each assignment. After assignment occurs the frequency is marked as assigned, thus not reusable for adjacent cells.
  • the procedure is sequential up to when a block occurs due to violation of re-use restrictions or to neighbours list. In this case, the next available frequency (not assigned) in the considered group is assigned . 2. Once all available frequencies are used, and a block occurs again, the algorithm deletes the already planned frequencies going backwards, starting from the last frequency before the blocking one, and repeats the procedure with a new frequency, going on as already described in point 1.
  • the algorithm provides a frequency plan which respects all above said restrictions and that, according to interference restrictions, limits and optimizes the interference level, since it uses channels with lower measured power levels.
  • the frequency plan fills cell parameter data base containing new frequencies and BSIC of WOS microcells.
  • the manager fills out the command files in the syntax of the WOS OMC.
  • Command files are transferred to OMC, which automatically reconfigures the indoor network and re-starts service.
  • the manager In case the manager is an OMC CLIENT, it has to simply have a software able to fill out command files directly, starting from the cell parameters database. Automatic submission to BSC is made directly from the CLIENT. On the contrary case, the manager has to have a dedicated program to translate cell parameters data' base in command files and afterwards to transfer them into OMC. Once they are in 1 -, OMC, automatic submission to BSC has to be possible for cells reconfiguration.
  • the Self Planner may be modified in some of its parts for automatic configuration of 3 rd generation indoor systems.

Abstract

The invention is oriented to automatic frequency planning for GSM mobile systems and, more precisely, it refers to a method and to an equipment to be combined with a Wireless Office System (WOS) to detect frequencies of the Public Land Mobile Network (PLMN) in the indoor area and for frequency planning and automatic reconfiguration of WOS micro cells, by the Operation and Maintenance Center (OMC) of indoor system, minimizing interference with PLMN. This is particularly useful for the mobile operator, who is relieved from planning and parameters management. Updating of WOS frequencies is completely automatic and in real-time, assuring a low level of interference thanks to power level measurements on all operator's frequency bands.

Description

SYSTEM FOR INDOOR CELLULA NETWORKS AUTOMATIC FREQUENCY PLANNING
DESCRIPTION
It is known that PLMN frequency planning of indoor systems is considerably problematic due to lack of available frequency bands and to high frequency re-use especially in areas with base stations high density.
Frequency planning conventional modes are based at employment of tools for coverage prediction where mutual interference matrix between cells, is defined . Such matrix makes up the automatic frequency planning algorithm input. The inconvenience of this application in the indoor scenario is that the simulation coverage tools often lack detailed topographic database and urban clutter able to predict indoor area coverage, thus assigning frequencies in a non-optimum way. Another method used by GSM mobile operators involves a series of measurements in indoor area before WOS installation, and assignment of frequencies. This method is highly reliable because based on measured and not simulated power levels but it requires repeated measurements on site, at each data change in the PLMN. It is also known that the majority of WOS systems implements (ref. Fig. 1), at OMC (3) and BSS (4) levels, a Radio Interference Recording function, which results, processed together with some statistical counters, advice the operator on the adequate change of frequencies in WOS to better radio connection quality.
Independently of the chosen method, process for frequency assignment and cells data management has to be made by the mobile operator, who should also produce configuration files, command files and their loading on the network OMC. Main purpose of the present invention is to provide a system for automatic frequenc planning and GSM WOS parameters self-configuration in a completely automatic way, without any action from the GSM mobile operator.
Another advantage of such invention is that it guarantees a low interference level and a better quality of radio connection thanks to the real time detection of frequencies present in indoor area and related power levels. The Self planner may be combined to all GSM WOS: it always provides the frequency automatic planning feature and the definition of cell parameters data base compliant with the WOS OMC syntax , containing the informations for network data reconfiguring. It is obvious that, to make automatic the network re-configuring, the WOS OMC has to be able to import a cell parameters database in any format. Should this performance not be available, the possibility of manually loading the cell parameters database in the OMC by the system administrator remains. The mobile operator may define, case by case, and according to his needs, if to keep a totally automatic procedure or operate during process phases for a greater control. To this purpose the Self Planners offers various choices, in both procedure and elaboration levels.
In particular, in WOS which implement performances of Radio Interference Recording, the Self Planner provides the possibility to elaborate the frequency planning process by simply processing results of Radio Interference Recording and using them as input for planning algorithm, and also by integrating such results with collected measurements.
To better clarify the explanation concerning application of present invention innovating principles, and its advantages against the already known technique, a description (with the aid of attached diagrams) of a possible, but not exclusively, GSM
900-1800/1900 MHz system realization will follow.
According to the invention principles, the Self Planner is a system able to accomplish the following operations: a) Monitoring of affiliated operator's network (PLMN) b) Measurement of Received Level Average per Cell (RLA_C) values for each GSM channel reserved to that PLMN c) De-coding and recording of Information Elements transmitted on broadcast control channels: Absolute Radio Frequency Channel Number (ARFCN), Location Area Code (LAC), Cell Identity (CI), Base Station Identity Code (BSIC). Reduced
Frame Number (RFN) d) Data collection and processing e) Monitoring of PLMN frequency plan from comparison between cycles of subsequent measurements f) Processing of frequency planning algorithm for indoor network micro cells g) BSIC and frequency automatic loading in OMC for each micro cell h) WOS automatic reconfiguration
A set of monitors receivers is installed in the indoor area, where WOS is present Monitors (1) are able to perform (a) (b) (c) operations. In particular, to have a reliable measurement procedure in each possible interference situation, it is possible to set the monitor with the following parameters: list of down-link channels on which the monitor has to operate;
- detectable maximum and minimum values of Received Level Average per Cell (RLA_C)
- measurement period on each radio channel
For each WOS, it is possible to install one or more monitors in proximity of each microcell coverage area. Each monitor collects data for frequency planning of one or more microcells, according to its position. Data processing and collection takes place through a computer, the "manager" (2). To transmit collected data, monitors may be connected to the "manager" through dedicated cabling as shown in fig. 2 (wired solution) and/or through radio by equipping monitor and manager with antennas (fig.
6) as shown in fig. 3 (wireless solution).
The manager (2) is a service computer or an OMC CLIENT which manages conditions and time of data collecting procedures of all monitors; afterwards it elaborates frequency planning algorithms.
The manager compares measurement sessions received by the monitors and, if needed, detects PLMN frequency plan changes.
In case of data change, according to registered measurements, the manager chooses a group of frequencies which measured power level is below a threshold, considered not interfering and which total number is greater than WOS channels to be planned.
Afterwards, two or more groups of frequencies, with higher safe threshold, are chosen; this to obtain in each group more and more available frequencies.
At this point, the manager is able to elaborate the frequency assignment algorithm.
Algorithm Description
Inputs listed below show how the frequency planning algorithm is elaborated:
- Group 1, 2 ...m of available frequencies
- Correspondence between monitor and micro cells
- List of micro cells ordered according to their building position compared to the outside area (maximum priority to micro cells next to windows and doors in upper floors of the building)
- Channel dimensioning for WOS microcells
- Neighbours list between microcells
- Specific frequency re-use restrictions for WOS equipment 1. The algorithm starts by considering frequencies of Group 1 corresponding to lower interference threshold, thus potentially less interfering and, according to the dimensioning of each cell, assigns first all broadcast channels, afterwards all traffic channels of each micro cell respecting priority order and verifying the re-use restrictions at each assignment. After assignment occurs the frequency is marked as assigned, thus not reusable for adjacent cells.
The procedure is sequential up to when a block occurs due to violation of re-use restrictions or to neighbours list. In this case, the next available frequency (not assigned) in the considered group is assigned . 2. Once all available frequencies are used, and a block occurs again, the algorithm deletes the already planned frequencies going backwards, starting from the last frequency before the blocking one, and repeats the procedure with a new frequency, going on as already described in point 1.
3. Once all frequencies inside the minimum interference threshold group run out, the entire procedure of point 1 is repeated considering the second group of frequencies with a higher interfering level, obviously a larger group.
4. At elaboration ending, the algorithm provides a frequency plan which respects all above said restrictions and that, according to interference restrictions, limits and optimizes the interference level, since it uses channels with lower measured power levels. The frequency plan fills cell parameter data base containing new frequencies and BSIC of WOS microcells.
When the indoor network frequency plan is defined, the manager fills out the command files in the syntax of the WOS OMC. Command files are transferred to OMC, which automatically reconfigures the indoor network and re-starts service. , In case the manager is an OMC CLIENT, it has to simply have a software able to fill out command files directly, starting from the cell parameters database. Automatic submission to BSC is made directly from the CLIENT. On the contrary case, the manager has to have a dedicated program to translate cell parameters data' base in command files and afterwards to transfer them into OMC. Once they are in1-, OMC, automatic submission to BSC has to be possible for cells reconfiguration.
The Self Planner may be modified in some of its parts for automatic configuration of 3rd generation indoor systems.

Claims

(Self Planner) System to be combined to a GSM Wireless Office System (WOS) to detect Public Land Mobile Network (PLMN) frequencies in the indoor area, to plan frequencies and reconfigure WOS microcell , minimizing interference with PLMN.
(Self Planner) System according to claim n. 1, characterized by automatic measurement procedure of the power levels and decoding of channels Information Elements of the PLMN.
(Self Planner) System according to claim n. 1, characterized by automatic processing of the planning algorithm and WOS network reconfiguration.
(Self Planner) System according to claim n. 1, characterized by transmission from the monitor (1) to the manager (2) of collected data through dedicated cabling (fig. 2) or via radio (fig. 3).
(Self Planner) System according to claim n. 1, where the WOS OMC has to provides the possibility to import cell parameters database compliant with his syntax, to make automatic the network re-configuring.
(Self Planner) System according to claim n. 1, where up-dating of WOS frequency is automatic and in real-time, through Operation and Maintenance Center, providing the lower interference level thanks to local power measurements on all operator's band.
(Self Planner) System according to claim n. 1, combinable to any WOS system which allows the mobile operator to manually load frequency plan produced by the manager, if the OMC is lacking cell parameters database import function or if the mobile operator wants to further control produced data.
8. (Self Planner) System according to claim n. 1 and n. 5, where monitoring and data elaboration procedures may be easily modifiable to allow adaptability of operator's needs to the interfering scenario where WOS is present.
9. (Self Planner) System according to claim n. 1, where the Self planner is compatible with Radio Interference Recording functions already implemented in WOS: the Self Planner may integrate the related output with level measurements results or may simply processing them as input for its own planning algorithm.
10. (Self Planner) System according to claim n. 1 and 2, where frequency planning algorithm considers mutual interference between outdoor and indoor cells thanks to monitors measurements and proper predefined rules.
11. (Self Planner) System according to claim n. 1 and 9, where implementation of different algorithm in computer manager is allowed, according to needs and defined by the operator.
12. (Self Planner) System which provides the possibility to be modified in some or all its parts for automatic configuration of 3rd generation indoor systems.
PCT/IT2001/000092 2000-05-31 2001-02-27 System for indoor cellula networks automatic frequency planning WO2001093617A1 (en)

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Application Number Priority Date Filing Date Title
AU41038/01A AU4103801A (en) 2000-05-31 2001-02-27 System for indoor cellula networks automatic frequency planning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000TS000003A ITTS20000003A1 (en) 2000-05-31 2000-05-31 SELF PLANNER: AUTOMATIC FREQUENTIAL PLANNING FOR RADIO MOBILE SYSTEMS
ITTS2000A000003 2000-05-31

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Cited By (6)

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GB2404113A (en) * 2003-07-12 2005-01-19 Motorola Inc Cell-based communication system and method for frequency planning
WO2007015071A3 (en) * 2005-08-01 2007-05-24 Ubiquisys Ltd Automatic base station configuration
WO2009000790A1 (en) * 2007-06-26 2008-12-31 Nokia Siemens Networks Oy Private base station and radio network entity
JP2009504050A (en) * 2005-08-01 2009-01-29 ユビキシス リミテッド Automatic base station configuration
WO2009154647A1 (en) * 2008-06-19 2009-12-23 Qualcomm Incorporated Self-configuration for femtocells
US8483760B2 (en) 2007-02-23 2013-07-09 Ubiquisys Limited Basestation for cellular communications system

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US5774805A (en) * 1994-02-24 1998-06-30 Gte Mobile Communications Service Corporation Multi-mode communication network with handset-selected channel assignments
WO2000074415A1 (en) * 1999-05-28 2000-12-07 Ericsson Inc. Automatic frequency allocation (afa) for wireless office systems sharing the spectrum with public systems

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2404113A (en) * 2003-07-12 2005-01-19 Motorola Inc Cell-based communication system and method for frequency planning
WO2005006798A1 (en) * 2003-07-12 2005-01-20 Motorola Inc Communication units, cell-based communication system and method for frequency planning therein
GB2404113B (en) * 2003-07-12 2005-11-02 * Motorola, Inc Communication units, cell-based communication system and method for frequency planning therein
WO2007015071A3 (en) * 2005-08-01 2007-05-24 Ubiquisys Ltd Automatic base station configuration
EP2506658A3 (en) * 2005-08-01 2016-07-13 Ubiquisys Limited Automatic base station configuration
JP2009504050A (en) * 2005-08-01 2009-01-29 ユビキシス リミテッド Automatic base station configuration
EP2506657A3 (en) * 2005-08-01 2016-07-13 Ubiquisys Limited Automatic base station configuration
EP2337393A3 (en) * 2005-08-01 2012-03-07 Ubiquisys Limited Self-configuring cellular basestation
US9144111B2 (en) 2005-08-01 2015-09-22 Ubiquisys Limited Self-configuring cellular basestation
US8483760B2 (en) 2007-02-23 2013-07-09 Ubiquisys Limited Basestation for cellular communications system
US8849279B2 (en) 2007-02-23 2014-09-30 Ubiquisys Limited Basestation for cellular communications system
US8787252B2 (en) 2007-06-26 2014-07-22 Nokia Siemens Networks Oy Private base station and radio network entity
WO2009000790A1 (en) * 2007-06-26 2008-12-31 Nokia Siemens Networks Oy Private base station and radio network entity
US8467304B2 (en) 2008-06-19 2013-06-18 Qualcomm Incorporated Self-configuration for femtocells
WO2009154647A1 (en) * 2008-06-19 2009-12-23 Qualcomm Incorporated Self-configuration for femtocells

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Publication number Publication date
AU4103801A (en) 2001-12-11
ITTS20000003A1 (en) 2001-12-01

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