WO2000018164A1 - Partage de la charge des cellules dans un environnement de selection de cellules commande par les stations mobiles - Google Patents

Partage de la charge des cellules dans un environnement de selection de cellules commande par les stations mobiles Download PDF

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Publication number
WO2000018164A1
WO2000018164A1 PCT/SE1999/001606 SE9901606W WO0018164A1 WO 2000018164 A1 WO2000018164 A1 WO 2000018164A1 SE 9901606 W SE9901606 W SE 9901606W WO 0018164 A1 WO0018164 A1 WO 0018164A1
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WO
WIPO (PCT)
Prior art keywords
cell
load
cell selection
system information
mobile
Prior art date
Application number
PCT/SE1999/001606
Other languages
English (en)
Inventor
Peter Oskar Olof BJÖRKÉN
Lars Erik Westerberg
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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 Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to EP99952844A priority Critical patent/EP1116402A1/fr
Priority to BR9913997-9A priority patent/BR9913997A/pt
Priority to AU64908/99A priority patent/AU6490899A/en
Priority to CA002344498A priority patent/CA2344498A1/fr
Publication of WO2000018164A1 publication Critical patent/WO2000018164A1/fr

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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
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing

Definitions

  • the present invention relates in general to the radio telecommunications field and, in particular, to a method and system for enabling cell load sharing in a mobile-controlled cell selection environment, such as, for example, in a radio packet data system.
  • each BTS is assigned to cover a certain geographical service area (cell).
  • each BTS is responsible for communicating with all of the MSs that are active in its cell.
  • the cell of a BTS e.g., BTS A
  • BTS A includes the geographical area in which, out of all of the BTSs in the system, that BTS provides the best radio link quality.
  • the border at which an MS changes communication from BTS A to BTS B is called the cell border between cell A and cell B.
  • the traffic load generated by the users varies in time. This fact implies that the radio network needs to be over-dimensioned in order to compensate for traffic peaks.
  • the existing load is too high to provide adequate service quality to the MSs in those cells, while at the same time, neighboring cells can have surplus capacity.
  • This approach which is commonly referred to as "cell-load sharing," is used in conventional cellular speech communication systems (e.g., in the GSM).
  • MS-controlled cell selection there are two ways to administer cell selection in cellular radio systems: MS-controlled cell selection; and network-controlled cell selection.
  • MS-controlled cell selection it is the MS's responsibility to determine to which
  • the MS considers whatever information it has at hand (radio conditions, received signal strengths, service capabilities, and possibly, additional information received in system information messages, etc.) as input(s) to a pre-determined cell selection algorithm.
  • the output from the cell selection algorithm denotes the cell to which the MS should connect.
  • the network commands the MSs to connect to a certain BTS (cell).
  • a necessary condition for network-controlled cell selection is that every MS consistently provides the network with measurement reports. Essentially, the measurement reports inform the network about how the reporting MS perceives the candidate BTSs or cells, in terms of their signal strength and radio link quality.
  • the main advantage of network-controlled cell selection is that a relatively intelligent cell selection algorithm can be used.
  • the network can use the wealth of information it has available, not only about the radio link conditions, but also about the load in each cell, buffered data packets, quality of service contracts with users, preferred home zones, etc.
  • Network-controlled cell selection is used, for example, in the circuit-switched GSM.
  • the biggest disadvantages of network-controlled cell selection are the increased complexity for the network involved, and that each MS has to provide measurement reports regularly to the network. Unfortunately, the measurement reports use uplink bandwidth and, therefore, actually decrease the system's capacity.
  • the increased complexity results from the network having to administer a locating procedure for each active MS.
  • each MS is responsible for its own cell selection procedures.
  • the system can use either MS-controlled or network-controlled cell selection.
  • MS-controlled cell selection will be the method of choice for the majority of future GPRS networks.
  • the pertinent prior art focuses on cell load sharing in systems using network-controlled cell selection approaches. In such systems, the process whereby an active MS selects another cell is always initiated by a cell re-selection (i.e., "handover") command issued from the network.
  • the network can identify candidate MSs in a congested cell, and direct these MSs to connect to less congested cells by issuing re-selection commands for dedicated cells (i.e., the less congested cells).
  • dedicated cells i.e., the less congested cells
  • a method and system are provided for implementing cell load sharing in an MS- controlled cell selection environment, such as, for example, in a radio packet data system, wherein dynamic system information (e.g., SI messages) is used to enable an MS to perceive cell borders that depend on the system load.
  • dynamic system information e.g., SI messages
  • cell selection parameters in the system information messages are associated with the distribution of the load in various cells. In this way, the MSs (which are responsible for their own cell selection) in overloaded cells can be prompted to select alternative, less loaded cells.
  • An important technical advantage of the present invention is that a method is provided for using cell load sharing in a system in which MS-controlled cell selection is also being used.
  • Another important technical advantage of the present invention is that it enables systems with only MS-controlled cell selection to also use cell load sharing.
  • Still another important technical advantage of the present invention is that in systems that can choose between a network-controlled and MS-controlled cell selection mode (e.g., GPRS), cell load sharing can be used while the system is operating in the MS-controlled cell selection mode.
  • a network-controlled and MS-controlled cell selection mode e.g., GPRS
  • Yet another important technical advantage of the present invention is that it enables the use of load sharing in radio packet data systems (e.g., GPRS) to increase capacity and avoid congestion, without overloading the uplink with measurement report traffic.
  • radio packet data systems e.g., GPRS
  • FIGURE 1 is a diagram that illustrates an exemplary system that can be used to implement the present invention
  • FIGURE 2 is a diagram that further illustrates how the exemplary system shown in FIGURE 1 can be used to implement the present invention.
  • FIGURE 3 is a diagram that illustrates how system information messages can be used to implement a preferred embodiment of the present invention.
  • FIGUREs 1 -3 of the drawings like numerals being used for like and corresponding parts of the various drawings.
  • a method and system are provided for implementing cell load sharing in a radio packet data system, wherein dynamic system information (e.g., in the form of SI messages) is used to enable an MS to perceive cell borders that depend on the system load.
  • dynamic system information e.g., in the form of SI messages
  • the network determines the cell borders by including pertinent cell selection parameters in the system information messages.
  • the system information messages can be either broadcast to all MSs in the network, or sent dedicated to a selected set of one or more MSs in an overloaded cell.
  • the cell selection parameters contain information, for example, about offsets that can be applied to the measured signal strengths, threshold values, cell priorities, etc.
  • the cell selection parameters in the system information messages are associated with the distribution of the load in various cells.
  • the MSs which are responsible for their own cell selection
  • the system information messages can be sent on the broadcast channel, or transmitted dedicated to a selected subset of MSs in the overloaded cell.
  • FIGURE 1 is a diagram that illustrates an exemplary system 100 that can be used to implement the present invention.
  • System 100 is preferably a system that employs MS-controlled cell selection, and can be a radio packet data system or packet- switched system such as the GPRS .
  • the exemplary radio packet data system 100 can be operating in conjunction with a circuit-switched system, such as the GSM, the Digital- Advanced Mobile Phone System (D-AMPS), or any other system capable of supporting a radio packet data system or service.
  • System 100 includes a plurality of base stations or BTSs, such as, for example, BTS A ( 102) and neighboring BTS B (104).
  • BTS A defines one cell (A)
  • BTS B defines a second cell (B).
  • SS A SS B
  • BSC base station controller
  • the system information messages e.g., SI messages in the GSM and GPRS
  • FIGURE 2 is illustratively similar to FIGURE 1, except that the scenario depicted in FIGURE 2 has more mobile terminals connected to BTS B 104 than to
  • BTS A 102 For example, three mobile terminals (110, 112, 114) have connected to BTS A 102, while seven mobile terminals (116-128) have connected to BTS B 104.
  • a sufficient quality of service e.g., QoS in GPRS
  • FIGURE 3 is a diagram that illustrates how system information messages can be used to implement a preferred embodiment of the present invention.
  • the cell border (108) between cells A and B appears to be shifted towards cell B, and thereby, cell A effectively covers a larger number of the mobile terminals than before.
  • An example of a system information message that can be used to convey the above-described offset to one or more mobile terminals in an MS-controlled cell selection environment is a GPRS cell selection parameters information element as defined at Section 11.2.19 of the GSM Technical Specification GSM 04.60, version 6.0.0, June 1998.
  • the information element can be delivered to all, or a subset of, the mobile terminals in cell A, either on the Packet Broadcast Control Channel (PBCCH) in cell A, or on one or more Packet Associated Control Channels (P ACCHs) in cell A.
  • PBCCH Packet Broadcast Control Channel
  • P ACCHs Packet Associated Control Channels
  • the information element can contain the 5 bit information element GPRS_RESELECT_OFFSET that defines a bias, or offset, to be used in the "C31/C32" criterion which is used in the GPRS for MS-controlled cell reselection.
  • This bias or offset value can be different for different cells and thus can be used to shift the MS-perceived boundary between two cells (e.g., between A and B).
  • an offset value of 4 dB can be added to the ranking criterion, C32, of cell B, by setting the five corresponding bits in the system information element described above to "01100" (+4 dB).
  • the receiving mobile terminals perceive the cell border between cell A and cell B (108 in this example) as shifted by 4 dB relative to the equal-signal-strength border (106).
  • the corresponding system information element in cell B i.e., the element controlling the cell border between cell A and cell
  • the SI 3 Rest Octets information element is a type 5 information element that contains a "CELL-RESELECT-OFFSET" information field.
  • the CELL-RESELECT- OFFSET is a bias or offset value (in dB) that is included in the so-called "C2" criterion for a cell. This bias or offset value can be different for different cells and thus can be used to shift the MS-perceived boundary between two cells (e.g., between A and B).
  • a CELL-RESELECT-OFFSET value of 4 dB can be added as an offset in the C2 criterion for cell A, by transmitting the corresponding bit pattern in the CELL_RESELECT_OFFSET information element in the System Information 3 Rest Octets transmitted on the BCCH in cell A.
  • this exemplary scenario assumes that the CELL_RESELECT_OFFSET field in the System Information 3 Rest Octets transmitted on the BCCH in cell B corresponds to a 0 dB bias or offset in cell B.
  • the offset caused by the cell parameters in the transmitted system information messages causes the mobile terminals in cell B which are close to the border of cell A (e.g., mobile terminals 116 and 118) to rank cell A as a "better" cell to be connected to than cell B. Therefore, these two mobile terminals effect a change (e.g., via a conventional handover procedure) from cell B to cell A.
  • the result is that the load (mobile terminal traffic) is moved from cell B to cell A in such a way that a sufficient quality of service can be offered to the users in both cell
  • the present invention increases the cellular system's ability to maintain a sufficient quality of service during periods of local congestion in the network.
  • a pertinent load can be related to (1) the total number of users in a cell, (2) the total number of active users in a cell, (3) the ratio of the total number of active users in a cell to the number of channels in the cell, (4) the ratio of the total number of queued data packets in a cell to the number of channels in the cell, (5) a measure of the QoS that can be offered in a cell (e.g., bandwidth per user, fraction of QoS contracts to users that can be fulfilled, etc.), and so on.
  • a measure of the QoS that can be offered in a cell e.g., bandwidth per user, fraction of QoS contracts to users that can be fulfilled, etc.
  • the cell boundary shifts that can result are not limited to boundaries between so-called macro-cells, but could include boundaries between disparate types of cells, such as, for example, micro-cells and macro-cells, pico-cells and micro-cells, etc.
  • the system information in all cells in a defined network area is dynamic information. Using this dynamic information at any given time, the network can (with any given temporary load distribution) optimize the quality of service offered to the packet data service users in the whole area.
  • the system information (to be broadcast or transmitted from the network) can be made dependent on the number of mobile terminals in each cell, the number of scheduled data packets in each cell, by the users' perceived quality of service in each cell, the packet delays in each cell, and so on.
  • a network algorithm e.g., being executed by a processor at a base station controller, BSC, or a mobile services switching center, MSC
  • BSC base station controller
  • MSC mobile services switching center
  • the present invention has been described above in the exemplary context of a GSM packet data service (e.g., GPRS), the present invention can be applied to any cellular radio system that can use system information as input to an MS- controlled cell selection algorithm. Furthermore, the present invention can be applied to any cellular radio system that can operate in an MS-controlled cell selection mode.
  • a system can include, for example, GPRS in GSM, GPRS in D-AMPS, an IS-95 system, cellular radio satellite systems, as well as the Universal Mobile Telephone System (UMTS), and both present and future spread spectrum and Wideband Code Division Multiple Access (WCDMA) systems.
  • UMTS Universal Mobile Telephone System
  • WCDMA Wideband Code Division Multiple Access

Abstract

Cette invention se rapporte à un procédé et à un système permettant de réaliser un partage de la charge des cellules dans un environnement de sélection de cellules commandé par les stations mobiles, tel que notamment un système de radiotransmission de données par paquets (100), dans lequel des informations de système dynamiques (par exemple des messages SI) sont utilisées pour permettre à une station mobile de percevoir des limites de cellule (108) qui dépendent de la charge du système. Essentiellement, les paramètres de sélection desellules contenus dans les messages d'informations du système sont associés à la répartition de la charge dans les diverses cellules (BTSA, BTSB). Ainsi, les stations mobiles (116, 118) (qui sont responsables de leur propre sélection de cellules) se trouvant dans des cellules surchargées (BTSB) peuvent être incitées à sélectionner d'autres cellules moins chargées (BTSA).
PCT/SE1999/001606 1998-09-22 1999-09-14 Partage de la charge des cellules dans un environnement de selection de cellules commande par les stations mobiles WO2000018164A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP99952844A EP1116402A1 (fr) 1998-09-22 1999-09-14 Partage de la charge des cellules dans un environnement de selection de cellules commande par les stations mobiles
BR9913997-9A BR9913997A (pt) 1998-09-22 1999-09-14 Método e sistema para compartilhamento de carga de célula em um meio de seleção de célula controlada por estação móvel
AU64908/99A AU6490899A (en) 1998-09-22 1999-09-14 Cell load sharing in a mobile-controlled cell selection environment
CA002344498A CA2344498A1 (fr) 1998-09-22 1999-09-14 Partage de la charge des cellules dans un environnement de selection de cellules commande par les stations mobiles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15825998A 1998-09-22 1998-09-22
US09/158,259 1998-09-22

Publications (1)

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WO2000018164A1 true WO2000018164A1 (fr) 2000-03-30

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PCT/SE1999/001606 WO2000018164A1 (fr) 1998-09-22 1999-09-14 Partage de la charge des cellules dans un environnement de selection de cellules commande par les stations mobiles

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EP (1) EP1116402A1 (fr)
CN (1) CN1319316A (fr)
AU (1) AU6490899A (fr)
BR (1) BR9913997A (fr)
CA (1) CA2344498A1 (fr)
WO (1) WO2000018164A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000072618A1 (fr) * 1999-05-21 2000-11-30 Telefonaktiebolaget Lm Ericsson (Publ) Procede de partage de charge de cellule dans un systeme de radiocommunciation cellulaire
GB2377855A (en) * 2001-07-18 2003-01-22 Ericsson Telefon Ab L M Cell re-selection based on cell loading
EP1292164A1 (fr) * 2001-09-10 2003-03-12 NTT DoCoMo, Inc. Eviter de la déconnexion d'un appel quand le rayon de cellule est réduite
GB2397469A (en) * 2003-01-20 2004-07-21 Motorola Inc Method and apparatus for cell biasing
EP1881718A1 (fr) * 2006-07-21 2008-01-23 Research In Motion Limited Procédé et système de detection de congestion de données et d'application d'une décalage pour re-sélection de cellule
CN100387088C (zh) * 2002-11-04 2008-05-07 中兴通讯股份有限公司 无线通信系统及其负荷控制方法和装置
GB2445392A (en) * 2006-11-16 2008-07-09 Nec Corp Load sharing in mobile radio communications network
US7747256B2 (en) 2006-07-21 2010-06-29 Research In Motion Limited Method and system for detecting data congestion and applying a cell reselection offset
WO2010147527A1 (fr) * 2009-06-18 2010-12-23 Telefonaktiebolaget L M Ericsson (Publ) Systèmes et procédés de sélection d'un système d'accès au réseau
CN101572934B (zh) * 2009-05-31 2011-08-24 中兴通讯股份有限公司 一种存储小区广播动态系统信息块的方法和装置
WO2012020851A1 (fr) * 2010-08-13 2012-02-16 Nec Corporation Procédés et appareils permettant une sélection de cellule dans un réseau de communication
US9084171B2 (en) 2009-09-10 2015-07-14 At&T Mobility Ii Llc Predictive hard and soft handover
US9253794B2 (en) 2011-12-02 2016-02-02 Telefonaktiebolaget L M Ericsson (Publ) Efficient spectrum utilization with almost blank subframes
US9288733B2 (en) 2011-09-23 2016-03-15 Telefonaktiebolaget L M Ericsson (Publ) Systems and methods for controlling cell selection in a heterogeneous cellular network based on primary direction of traffic flow

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EP0182027A2 (fr) * 1984-11-15 1986-05-28 Robert Bosch Gmbh Réseau de radio-téléphonie
GB2315386A (en) * 1996-07-13 1998-01-28 Motorola Ltd Improved Flow Control in Cellular Radio Networks

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GB1562963A (en) * 1976-12-30 1980-03-19 Siemens Ag Radio information transmission
EP0182027A2 (fr) * 1984-11-15 1986-05-28 Robert Bosch Gmbh Réseau de radio-téléphonie
GB2315386A (en) * 1996-07-13 1998-01-28 Motorola Ltd Improved Flow Control in Cellular Radio Networks

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000072618A1 (fr) * 1999-05-21 2000-11-30 Telefonaktiebolaget Lm Ericsson (Publ) Procede de partage de charge de cellule dans un systeme de radiocommunciation cellulaire
GB2377855A (en) * 2001-07-18 2003-01-22 Ericsson Telefon Ab L M Cell re-selection based on cell loading
US7292860B2 (en) 2001-09-10 2007-11-06 Ntt Docomo, Inc. Cell formation control method, a mobile communications system, and a base station and a mobile station used therein
EP1292164A1 (fr) * 2001-09-10 2003-03-12 NTT DoCoMo, Inc. Eviter de la déconnexion d'un appel quand le rayon de cellule est réduite
US7110769B2 (en) 2001-09-10 2006-09-19 Ntt Docomo, Inc. Cell formation control method, a mobile communications system, and a base station and a mobile station used therein
CN100387088C (zh) * 2002-11-04 2008-05-07 中兴通讯股份有限公司 无线通信系统及其负荷控制方法和装置
GB2397469A (en) * 2003-01-20 2004-07-21 Motorola Inc Method and apparatus for cell biasing
GB2397469B (en) * 2003-01-20 2006-05-17 Motorola, Inc Method and apparatus for cell biasing in a cellular communication system
EP1881718A1 (fr) * 2006-07-21 2008-01-23 Research In Motion Limited Procédé et système de detection de congestion de données et d'application d'une décalage pour re-sélection de cellule
EP2117270A1 (fr) * 2006-07-21 2009-11-11 Research In Motion Limited Procédé et système pour détecter la congestion de données et appliquer un délai de resélection de cellule
US7747256B2 (en) 2006-07-21 2010-06-29 Research In Motion Limited Method and system for detecting data congestion and applying a cell reselection offset
US8295843B2 (en) 2006-07-21 2012-10-23 Research In Motion Limited Method and system for detecting data congestion and applying a cell reselection offset
GB2445392A (en) * 2006-11-16 2008-07-09 Nec Corp Load sharing in mobile radio communications network
GB2445392B (en) * 2006-11-16 2009-07-08 Nec Corp Load sharing in mobile radio communications network
CN101572934B (zh) * 2009-05-31 2011-08-24 中兴通讯股份有限公司 一种存储小区广播动态系统信息块的方法和装置
WO2010147527A1 (fr) * 2009-06-18 2010-12-23 Telefonaktiebolaget L M Ericsson (Publ) Systèmes et procédés de sélection d'un système d'accès au réseau
US8391141B2 (en) 2009-06-18 2013-03-05 Telefonaktiebolaget L M Ericsson (Publ) Systems and methods for selecting a network access system
US9681362B2 (en) 2009-06-18 2017-06-13 Telefonaktiebolaget Lm Ericsson (Publ) Systems and methods for selecting a network access system
US8687486B2 (en) 2009-06-18 2014-04-01 Telefonaktiebolaget L M Ericsson (Publ) Systems and methods for selecting a network access system
US9198114B2 (en) 2009-06-18 2015-11-24 Telefonaktiebolaget L M Ericsson (Publ) Systems and methods for selecting a network access system
US9084171B2 (en) 2009-09-10 2015-07-14 At&T Mobility Ii Llc Predictive hard and soft handover
KR101532152B1 (ko) * 2010-08-13 2015-06-26 닛본 덴끼 가부시끼가이샤 통신 네트워크에서 셀을 선택하는 방법 및 장치
WO2012020851A1 (fr) * 2010-08-13 2012-02-16 Nec Corporation Procédés et appareils permettant une sélection de cellule dans un réseau de communication
RU2552156C2 (ru) * 2010-08-13 2015-06-10 Нек Корпорейшн Способы и аппараты для выбора соты в сети связи
CN103039112B (zh) * 2010-08-13 2015-12-16 日本电气株式会社 用于通信网络中的小区选择的方法和设备
US9277496B2 (en) 2010-08-13 2016-03-01 Nec Corporation Cell selection
CN103039112A (zh) * 2010-08-13 2013-04-10 日本电气株式会社 用于通信网络中的小区选择的方法和设备
US9288733B2 (en) 2011-09-23 2016-03-15 Telefonaktiebolaget L M Ericsson (Publ) Systems and methods for controlling cell selection in a heterogeneous cellular network based on primary direction of traffic flow
US9253794B2 (en) 2011-12-02 2016-02-02 Telefonaktiebolaget L M Ericsson (Publ) Efficient spectrum utilization with almost blank subframes

Also Published As

Publication number Publication date
CA2344498A1 (fr) 2000-03-30
AU6490899A (en) 2000-04-10
CN1319316A (zh) 2001-10-24
EP1116402A1 (fr) 2001-07-18
BR9913997A (pt) 2001-07-03

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