US20040224684A1 - Method for a radiotelephone to search for higher priority networks - Google Patents
Method for a radiotelephone to search for higher priority networks Download PDFInfo
- Publication number
- US20040224684A1 US20040224684A1 US10/431,617 US43161703A US2004224684A1 US 20040224684 A1 US20040224684 A1 US 20040224684A1 US 43161703 A US43161703 A US 43161703A US 2004224684 A1 US2004224684 A1 US 2004224684A1
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- Prior art keywords
- radiotelephone
- public land
- land mobile
- higher priority
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
-
- 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]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
Definitions
- the present invention relates in general to radiotelephone communication systems, and more particularly to a method for a radiotelephone to scan for alternate radiotelephone access communication systems.
- GSM Global System for Mobile
- WCDMA Wideband Code Division Multiple Access
- UMTS Universal Mobile Telecommunications System
- a UMTS radiotelephone is required to scan for these radio access technologies and frequencies when looking for its home Public Land Mobile Network (PLMN), to determine the availability of its home PLMN (HPLMN).
- PLMN Public Land Mobile Network
- HPLMN home PLMN
- the 3GPP specifications allow for a mobile station to perform (background) scans for PLMNs other than the one on which it has currently obtained service.
- GSM and UMTS cellular radiotelephones are required to perform a periodic search for their home PLMN and higher priority PLMNs whenever the radiotelephone is camped on a Visited PLMN (VPLMN) and in its home country.
- VPN Visited PLMN
- the mobile stations are required to perform a search for higher priority PLMNs, but not their home PLMN.
- This search is required to be performed periodically at a rate which is specified on the Subscriber Identity Module (SIM) or Universal SIM card and is a multiple of six minutes (with the fastest rate being once every six minutes).
- SIM Subscriber Identity Module
- Universal SIM card Universal SIM card
- the radiotelephone is currently required by 3GPP specifications to perform the search in both RATs (i.e. the phone must perform the search for the HPLMN in all radio access technologies of which it is capable). This is true even if the HPLMN network has cells of only one RAT. Therefore, the requirement to search for all possible RATs and all possible frequencies wastes significant battery power and is unnecessary.
- FIG. 1 illustrates a simplified block diagram of a mobile unit and a network, in accordance with the present invention
- FIG. 2 illustrates the interaction between a mobile unit and a network, in accordance with the present invention.
- FIG. 3 illustrates a flow chart of method of operation of a mobile unit, in accordance with the present invention.
- the present invention provides a method to allow a mobile unit to search for the home PLMN and higher priority PLMNs in only those radio access technologies and frequencies of higher priority networks that have not already been discounted (i.e. determined to be not of the HPLMN or higher priority PLMNs) during previous scans performed in the same geographic area. This saves time and battery power in the mobile unit. Additionally, the present invention can be implemented in a communication system with a relatively simple software modification and no additional hardware, therefore limiting any cost penalty.
- Allowing for higher priority network scanning in accordance with the present invention provides several advantages. These advantages include, but are not limited to, the following examples.
- the mobile unit can scan for available higher priority service within another technology. Scanning can reduce roaming charges when a home or higher priority network is available.
- the mobile unit can reduce the number of required scans to obtain service on its home or higher priority network, thereby saving battery drain.
- the home or higher priority networks can provide more efficient services that can be used beneficially by the mobile unit.
- FIGS. 1 and 2 show mobile radiotelephone operation, in accordance with the present invention.
- communication networks have a plurality of cells for providing radiotelephone service to a radiotelephone within a corresponding geographic area. Different networks may have overlapping cell coverage within a geographic area.
- Each cell of a network provides a radio communication coverage area established by fixed site base stations.
- Each base station is operable to send and receive messages with mobile radiotelephones.
- As the radiotelephones are mobile, they are required to search for home radio access technology communication networks as they roam between cells and/or communication systems.
- Communication systems such as GSM, operate on frequency bands with radio channels identified by Absolute Radio Frequency Channel Number (ARFCN).
- ARFCN Absolute Radio Frequency Channel Number
- GSM 900 MHz band ARFCN 1 to 124 are used.
- GSM 1800 MHz band uses ARFCN 512 to 885
- GSM 1900 MHz band uses ARFCN 512 to 810.
- different PLMN operators do not broadcast on the same frequencies in the same geographic areas.
- the mobile station (MS) 10 when the mobile station (MS) 10 is switched on, it attempts to make contact with a Public Land Mobile Network (PLMN), and in particular the last registered PLMN upon which service was provided.
- PLMN Public Land Mobile Network
- the MS chooses a local cell (Cell # 1 ) base station (BS) 12 of the PLMN, and the MS 10 and BS 12 initialize and register communication between themselves whereupon the mobile is camped on the base station's network (e.g. GSM or WCDMA).
- the MS 10 synchronizes to a control channel 13 of the BS 12 and reads the PLMN ID, ARFCN, an identifier for the cell (CELL ID), and the Base transceiver Station Identity Code (BSIC).
- PLMN ID Public Land Mobile Network
- ARFCN an identifier for the cell
- BSIC Base transceiver Station Identity Code
- the radiotelephone would save this information in storage 11 , which can be a Subscriber Identity Module (SIM), Universal SIM (USIM), or a memory, such as a non-volatile memory, for example.
- SIM Subscriber Identity Module
- USB Universal SIM
- memory such as a non-volatile memory
- a MS will be operable on its home PLMN. However, in those cases where the MS is roaming in its home country, it will camp and register on a Visited PLMN (VPLMN) and base station.
- the VPLMN can consist of one or more different radio access technologies, such as GSM and WCDMA, for example.
- a list of preferred PLMNs (possibly including the VPLMN) is prestored on a Subscriber Identity Module (SIM) card.
- SIM Subscriber Identity Module
- These listed PLMNs are assigned priorities by the home network provider of the MS. The highest priority network for the mobile unit is it's home Public Land Mobile Network (HPLMN) (or home-equivalent PLMN).
- HPLMN Public Land Mobile Network
- the MS since the MS is roaming, it may find itself camped on a lower priority VPLMN. Therefore, several other higher priority networks can be available to the MS. The presence of these higher priority networks must be determined through scanning.
- the mobile station When camped on a VPLMN, the mobile station is required under the 3GPP standard to do a search periodically to find access to higher priority networks, and preferably its home PLMN.
- the 3GPP 23.122 specification, version 5.2.0 (2002-12) in section 4.4.3.3 states, “If the MS is in a VPLMN, the MS shall periodically attempt to obtain service on its HPLMN or higher priority PLMN . . . ”
- the present invention is effective in those cases where the VPLMN is not the HPLMN of the mobile unit, inasmuch as the HPLMN is typically of the highest priority and no search would be required if the mobile unit was camped thereon.
- the MS 10 will search for the home and higher priority PLMNs than the VPLMN upon which the radiotelephone is presently camped.
- the radiotelephone could monitor the frequencies 15 , 17 , 19 of any co-located or nearby cells 14 , 16 , 18 having sufficient signal strength. The radiotelephone can then determine whether any of these cells are of a higher priority PLMN than the camped cell # 1 .
- a novel aspect of the present invention is then having the radiotelephone store a history of those frequencies found, while camped on a particular cell, that are not of a home or higher priority public land mobile network. Similarly, if a history already exists for the particular camped cell, then the radiotelephone adds any newly found frequencies that are not of a higher priority PLMN to any previously found frequencies in the history. The radiotelephone would save the history in storage 11 , which can be a SIM, USIM, or a memory, such as a non-volatile memory, for example.
- the history would be associated with the uniquely identified cell, such that the radiotelephone would no longer need to search for a particular frequency 15 , 17 , 19 within that uniquely identified cell since it had previously determined that this frequency is only used by an undesired PLMN.
- the radiotelephone stores an individual history of those frequencies found that are not of a home or higher priority public land mobile network for each of a plurality of cells of the VPLMN.
- the radiotelephone would scan for frequencies of the home or higher priority public land mobile networks except for those frequencies 15 , 17 , 19 listed in the history for the uniquely identified cell in which the radiotelephone is camped. This would save considerable searching time and the associated battery drain.
- the MS while camped on a cell (# 1 ) of a VPLMN network, the MS performs a search for the home and higher priority PLMNs.
- the MS saves a record which includes the following information: information (e.g. Cell ID 123456789, ARFCN, BSIC, etc.) to uniquely identify the serving cell at the time of the PLMN search, and the ARFCNs of the frequencies 15 , 17 , 19 which turned out to be PLMNs which were not the home or higher priority PLMNs (e.g. ARFCN 20 , 30 and 40 ).
- information e.g. Cell ID 123456789, ARFCN, BSIC, etc.
- PLMN I.D.s 111 / 22 , 111 / 33 and 111 / 44 are all PLMNs which are not the home or higher priority PLMNs.
- the radiotelephone can proceed with normal communication.
- the MS must perform another search for frequencies of the home and higher priority PLMNs.
- the MS now uses the saved history to avoid synchronizing to and reading the PLMN I.D. (i.e. skip searching) on frequencies 15 , 17 , 19 which have already been found to be not the home or higher priority PLMNs.
- Cell ID 123456789 has a history of undesired frequencies ARFCN 20 , 30 and 40 . Therefore, in this PLMN search, the MS will not attempt to synchronize to or read the PLMN I.D. on cell # 2 , # 3 , or # 4 (i.e. PLMN I.D.s 111 / 22 , 111 / 33 and 111 / 44 ), thereby saving time and power.
- the radiotelephone would only save the records described above only when the radiotelephone is powered (e.g. stored in RAM) such that the history records are reset anew at each power up.
- the radiotelephone could have a periodic timeout period (e.g. three hours) wherein the histories are erased and the radiotelephone must rebuild them.
- a user could change the user-controlled PLMN list on the SIM or USIM so that a PLMN that was not a higher priority PLMN before (when a previous search was performed and stored) is now a higher priority PLMN.
- the present invention provides that if the user changes the user-controlled PLMN list, then all of the history records of previous PLMN searches are reset (i.e. destroyed).
- the MS can still save the PLMN identifications (IDs) of those ARFCNs that were found to not be the home or higher priority PLMNs. In this way, if the user-controlled preferred PLMN list is changed, the MS would still be able to make use of the stored information to save current drain. This technique is preferred.
- the radiotelephone may be given a list of PLMNs which should be treated as equivalent to the VPLMN. (This list is given to the phone at the time of attach and Routing Area Update.)
- the equivalent PLMN list which the radiotelephone was using when the original PLMN search was performed is different than the equivalent PLMN list which it is currently using (i.e. a PLMN which was not a higher priority PLMN before when the previous PLMN search was performed could be a higher priority PLMN now.)
- the radiotelephone could not save a record of a previous PLMN search if equivalent PLMNs were in use at the time, and the radiotelephone could not use any of the stored history records of previous PLMN searches if equivalent PLMNs are in use now.
- the radiotelephone could save the equivalent PLMN list that was in use at the time as part of the saved history information for that PLMN search. Afterwards, when performing future PLMN searches, the radiotelephone would only use the saved information to minimize battery consumption if the equivalent PLMN list in use now is the same as that which was in use when the original search (associated with the saved history) was performed. It should be noted that it is very likely that the equivalent lists will in fact be the same.
- the radiotelephone could simply save the PLMN IDs associated with each of the ARFCNs which was found to be not the home or higher priority PLMNs. This way, when performing a later search, if one of the PLMN IDs now is a higher priority PLMN, then the radiotelephone would know that is must synchronize to and read the PLMN ID on that cell to re-verify it.
- the radiotelephone can always be directed to do a complete search for all available frequencies in use for the home or higher priority PLMNs, and update the history with any new frequencies found that are not of the home or higher priority PLMN. Similarly, the radiotelephone can be required to erase the history for any change in the preferred public land mobile network list.
- the present invention provides that by skipping the search in the frequencies which are not employed by the higher priority PLMN operator, the battery drain is greatly reduced.
- the radiotelephone will periodically perform the higher priority PLMN search in only those frequencies which can belong to higher priority PLMNs, and can update the stored history with those new frequencies that have been found not to be employed by the higher priority PLMN operator.
- the method of the present invention can be further understood with reference to FIG. 3.
- the method provides for a radiotelephone to search for radio access technology communication networks.
- Each communication network includes a plurality of cells for providing radiotelephone service to a radiotelephone within a corresponding geographic area.
- Each cell includes paging and voice communication and has a radio communication coverage area established by fixed site base stations, which operate to send messages to radiotelephones and receive messages therefrom.
- a first step 300 the mobile radiotelephone registers and camps on a local PLMN (typically the best available network) that has service in one or more radio access technologies in which the radiotelephone is capable.
- the radiotelephone also uniquely identifies 302 the cell it is camped on. It may be that the radiotelephone is camped on the highest priority PLMN (e.g. home) available to it. However, for the present invention, the radiotelephone is camped on a Visited PLMN that is not the highest priority PLMN available to it. This calls for the radiotelephone to begin searching for a higher priority PLMN, and preferably its home or home-equivalent network. While on the VPLMN, the radiotelephone begins its normal reception and response or acknowledgement to messages and communications. However, the mobile radiotelephone is now required to periodically scan for the home or higher priority PLMN.
- PLMN typically the best available network
- a next step 304 includes searching for public land mobile networks with a higher priority than the visited public land mobile network that the radiotelephone is camped on.
- a novel aspect of the present invention is storing 306 a history of those frequencies found that are not of the home or higher priority public land mobile network. Similarly, if a history already exists for the camped cell, then the radiotelephone adds any newly found frequencies that are not of the home or higher priority PLMN to any previously found frequencies of the history.
- the radiotelephone would save the history in storage, which can be a SIM, USIM, or a memory, such as a non-volatile memory, for example.
- the history would be associated with the uniquely identified cell from step 302 , such that the radiotelephone would no longer need to scan on a particular frequency when camped on the uniquely identified cell since it had previously determined that this frequency is only used by an undesired PLMN.
- the radiotelephone stores an individual history of those frequencies found that are not of the home or higher priority public land mobile network for each of a plurality of cells of the VPLMN.
- the radiotelephone would begin scanning 308 for frequencies of the home or higher priority public land mobile networks except for those frequencies listed in the history for the uniquely identified cell in which the radiotelephone is camped. This would save searching time and the associated battery drain since it is no longer necessary for the mobile unit to waste power scanning for all possible radio access technologies and all possible frequencies.
- the method includes further steps of periodically searching 310 , but at a very slow rate so as not to use much battery power, for all available radio access technologies and frequencies in use for the home or higher priority public land mobile networks, and updating 312 the history with any new frequencies found that are not of the home or higher priority public land mobile network.
- This is desired for those cases where the PLMN changes its radio access technologies or frequencies after the radiotelephone has stored a history. This is a failsafe technique to ensure that the radiotelephone keeps up to date information in accordance with the requirements of the 3GPP standard.
- the history in the storing step can be started anew each time the radiotelephone is powered on or after a certain amount of time elapses.
- the present invention provides particular advantage for service providers that are looking forward to the availability of mobile stations capable of selecting the best available network type among different radio access technology networks. These features will provide a way for operators to use these same mobile stations while minimizing the impact on their networks.
- the method of the present invention can also be applied to scanning for more than one radio access technology, using a multimode radiotelephone capable of camping on several different radio technology systems.
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Circuits Of Receivers In General (AREA)
- Transceivers (AREA)
Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/431,617 US20040224684A1 (en) | 2003-05-07 | 2003-05-07 | Method for a radiotelephone to search for higher priority networks |
DE602004017299T DE602004017299D1 (de) | 2003-05-07 | 2004-04-27 | Verfahren für einen funkfernsprecher zum suchen nach netzwerken mit höherer priorität |
PCT/US2004/013192 WO2004102927A2 (en) | 2003-05-07 | 2004-04-27 | A method for a radiotelephone to search for higher priority networks |
EP04760849A EP1621030B1 (en) | 2003-05-07 | 2004-04-27 | A method for a radiotelephone to search for higher priority networks |
CNB2004800100095A CN100415003C (zh) | 2003-05-07 | 2004-04-27 | 用于无线电话搜寻较高优先级网络的方法 |
BRPI0410115-4A BRPI0410115A (pt) | 2003-05-07 | 2004-04-27 | método para um radiotelefone pesquisar redes de prioridade mais alta |
KR1020057020979A KR101109920B1 (ko) | 2003-05-07 | 2004-04-27 | 무선전화기가 더 높은 우선순위의 네트워크를 검색하는 방법 |
MXPA05011985A MXPA05011985A (es) | 2003-05-07 | 2004-04-27 | Un metodo para que un radio telefono busque redes de prioridad mas alta. |
ES04760849T ES2314424T3 (es) | 2003-05-07 | 2004-04-27 | Un metodo para que un radiotelefono busque las redes de mayor prioridad. |
AT04760849T ATE412314T1 (de) | 2003-05-07 | 2004-04-27 | Verfahren für einen funkfernsprecher zum suchen nach netzwerken mit höherer priorität |
JP2006532498A JP4607886B2 (ja) | 2003-05-07 | 2004-04-27 | 優先順位の高いネットワークを探索するための無線電話用の方法 |
TW093113001A TWI362891B (en) | 2003-05-07 | 2004-05-07 | Method for a radiotelephone to search for higher priority networks |
MYPI20041692A MY141834A (en) | 2003-05-07 | 2004-05-07 | A method for a radiotelephone to search for radio access technologies in a networks |
US11/742,699 US7519365B2 (en) | 2003-05-07 | 2007-05-01 | Method for a radio telephone to search for higher priority networks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/431,617 US20040224684A1 (en) | 2003-05-07 | 2003-05-07 | Method for a radiotelephone to search for higher priority networks |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/742,699 Continuation US7519365B2 (en) | 2003-05-07 | 2007-05-01 | Method for a radio telephone to search for higher priority networks |
Publications (1)
Publication Number | Publication Date |
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US20040224684A1 true US20040224684A1 (en) | 2004-11-11 |
Family
ID=33416483
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/431,617 Abandoned US20040224684A1 (en) | 2003-05-07 | 2003-05-07 | Method for a radiotelephone to search for higher priority networks |
US11/742,699 Expired - Fee Related US7519365B2 (en) | 2003-05-07 | 2007-05-01 | Method for a radio telephone to search for higher priority networks |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/742,699 Expired - Fee Related US7519365B2 (en) | 2003-05-07 | 2007-05-01 | Method for a radio telephone to search for higher priority networks |
Country Status (13)
Country | Link |
---|---|
US (2) | US20040224684A1 (zh) |
EP (1) | EP1621030B1 (zh) |
JP (1) | JP4607886B2 (zh) |
KR (1) | KR101109920B1 (zh) |
CN (1) | CN100415003C (zh) |
AT (1) | ATE412314T1 (zh) |
BR (1) | BRPI0410115A (zh) |
DE (1) | DE602004017299D1 (zh) |
ES (1) | ES2314424T3 (zh) |
MX (1) | MXPA05011985A (zh) |
MY (1) | MY141834A (zh) |
TW (1) | TWI362891B (zh) |
WO (1) | WO2004102927A2 (zh) |
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Also Published As
Publication number | Publication date |
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JP2007500484A (ja) | 2007-01-11 |
KR20060008986A (ko) | 2006-01-27 |
WO2004102927A2 (en) | 2004-11-25 |
US20070202875A1 (en) | 2007-08-30 |
ATE412314T1 (de) | 2008-11-15 |
TWI362891B (en) | 2012-04-21 |
ES2314424T3 (es) | 2009-03-16 |
TW200501786A (en) | 2005-01-01 |
DE602004017299D1 (de) | 2008-12-04 |
JP4607886B2 (ja) | 2011-01-05 |
EP1621030A4 (en) | 2006-08-09 |
EP1621030A2 (en) | 2006-02-01 |
MXPA05011985A (es) | 2006-02-02 |
US7519365B2 (en) | 2009-04-14 |
WO2004102927A3 (en) | 2005-11-03 |
BRPI0410115A (pt) | 2006-05-09 |
EP1621030B1 (en) | 2008-10-22 |
CN1774940A (zh) | 2006-05-17 |
KR101109920B1 (ko) | 2012-03-08 |
MY141834A (en) | 2010-06-30 |
CN100415003C (zh) | 2008-08-27 |
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