WO2003067918A1 - Procede et dispositif de selection et d'acquisition efficaces de systemes de communication sans fil - Google Patents

Procede et dispositif de selection et d'acquisition efficaces de systemes de communication sans fil

Info

Publication number
WO2003067918A1
WO2003067918A1 PCT/US2003/003625 US0303625W WO03067918A1 WO 2003067918 A1 WO2003067918 A1 WO 2003067918A1 US 0303625 W US0303625 W US 0303625W WO 03067918 A1 WO03067918 A1 WO 03067918A1
Authority
WO
WIPO (PCT)
Prior art keywords
wireless communications
systems
acquisition
communications systems
mobile station
Prior art date
Application number
PCT/US2003/003625
Other languages
English (en)
Inventor
Rotem Cooper
Original Assignee
Qualcomm Incorporated
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
Priority claimed from US10/092,700 external-priority patent/US20040203745A1/en
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to KR10-2004-7011943A priority Critical patent/KR20040077931A/ko
Priority to AU2003219717A priority patent/AU2003219717A1/en
Priority to BRPI0307440-4A priority patent/BR0307440A/pt
Priority to CA002474506A priority patent/CA2474506A1/fr
Priority to EP03715987A priority patent/EP1472899A1/fr
Priority to MXPA04007544A priority patent/MXPA04007544A/es
Priority to JP2003567124A priority patent/JP2006504291A/ja
Publication of WO2003067918A1 publication Critical patent/WO2003067918A1/fr

Links

Classifications

    • 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

Definitions

  • the present invention relates generally to wireless communications and, in particular, to a method and apparatus for efficiently selecting and acquiring a wireless communications system.
  • a mobile device will often have access to more than one wireless communications system in its geographic region.
  • the quality of the wireless services available to the mobile device may vary from system to system depending on the equipment used by each system, the features of the mobile device, the distance between the mobile device and local base stations, physical obstructions such as buildings and hills, and the volume of communications traffic on each system.
  • the wireless communications systems may also support different multiple-access wireless communications protocols such as code division multiple access (CDMA), wideband CDMA (WCDMA), Advanced Mobile Phone Service (AMPS), Global System for Mobile communications (GSM), General Packet Radio Services (GPRS) or High Data Rate (HDR) technology (e.g., IxEV technology).
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • AMPS Advanced Mobile Phone Service
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Services
  • HDR High Data Rate
  • the fees charged to a user of the mobile device may vary depending on the time of day, the duration of the connection with the wireless communications system and whether the
  • the PRL typically includes a systems table which stores a system identifier (SID) and a network identifier (NED) for each known wireless communications system, and an acquisition table which stores acquisition parameters including band, frequency and mode, for the known wireless communications systems.
  • SID system identifier
  • NID network identifier
  • acquisition table which stores acquisition parameters including band, frequency and mode, for the known wireless communications systems.
  • the wireless communications systems are often grouped by geographic region and sorted from the most desirable to the least desirable system in each region.
  • the most desirable system in a particular geographic region is typically a subscriber system, but may also be a roaming system that offers the mobile device a favorable combination of low cost and high quality of service.
  • Roaming systems offer wireless services to non-subscriber mobile devices, usually at a much higher fee than subscription services, and may be desirable when the mobile device enters a geographic region that is outside the coverage area of the mobile device's subscription service, when the subscription services are blocked or otherwise unavailable, or when the subscription services are only available at an unacceptably low level of quality.
  • attempts are made to acquire and register with the most desirable wireless communications system that is available to the mobile device in its current geographic region.
  • the mobile device identifies its current geographic region and then steps through the entries in the systems table, from the most desirable system in the identified geographic region to the least desirable system in the identified geographic region, until a system acquisition and registration attempt is successful.
  • the mobile device may also attempt to acquire and register with a new wireless communications system during operation. For example, the connection between the mobile device and a current wireless communications system may be lost, requiring the acquisition of a new system by the mobile device.
  • the wireless communications systems that are available to the mobile device may change as the position of the mobile device and its surrounding environment changes. To provide the user of the mobile device with the best combination of high quality and low cost, many mobile devices periodically attempt to acquire and register with a wireless communications system that is more desirable than the current wireless communications system used by the mobile device.
  • the mobile device searches the systems table for wireless communications systems in its geographic region that are more desirable than the current system used by the mobile device and if more desirable systems are found in the systems table, the mobile device will switch away from the current communications channel and attempt to acquire and register with one of the more desirable systems.
  • a system acquisition sequence such as the system acquisition sequences described above, will often include a series of failed attempts to acquire a signal and register with the corresponding wireless communications system, followed by a single successful system acquisition and registration.
  • a preferred roaming list typically includes over 50 systems and under certain conditions the mobile device may spend over 60 seconds stepping through the systems in the preferred roaming list before an acquisition attempt is successful.
  • These failed acquisition attempts are common and may be caused by a variety of factors. For example, the mobile device may be unable to detect a pilot signal transmitted from a system base station if the pilot signal is blocked or weakened by physical obstructions, or if the mobile device is outside the base station's coverage area. Registration with the system may fail if the mobile device and the system use incompatible protocol revisions and hardware, or if system otherwise rejects the registration attempt of the mobile device.
  • the present invention is a method and apparatus for efficiently selecting and acquiring a wireless communications system.
  • a mobile station selects a group of wireless communications systems in accordance with a predetermined system acquisition procedure.
  • the selected group of systems has an order of priority, such as a preference order determined by a wireless services provider, that may be used by the mobile station during system acquisition and registration attempts.
  • received signals corresponding to each of the selected systems are analyzed to determine the likelihood that each of the corresponding systems would be acquired by the mobile station.
  • the group of wireless communications systems is then reprioritized based on the results of the analysis to produce a more efficient system acquisition order.
  • the mobile station attempts to acquire and register with one of the systems in the reprioritized group of wireless communications systems in accordance with the acquisition order specified by the group.
  • the mobile station preferably includes processing circuitry, a memory, a communications transceiver and an antenna.
  • the processing circuitry includes a control processor for controlling the operation of the mobile station, a signal processor, a searcher and a system determination unit.
  • the mobile station is a multi-mode device and the processing circuitry is adapted to operate in either CDMA or AMPS mode.
  • the memory preferably includes both volatile and nonvolatile random access memories that store a preferred roaming list, including a systems table and an acquisition table, and one or more lookup tables such as a candidates list.
  • the system determination unit is adapted to select one or more wireless communications systems from the systems table in accordance with a system acquisition procedure.
  • the system determination unit stores the selected systems in the candidates list and instructs the searcher to analyze a received signal corresponding to each of the systems in the candidates list.
  • the searcher instructs the transceiver to switch to the system's corresponding channel and a received signal is analyzed.
  • the analysis of the received signals may include measuring the received signal strength (Rx) of each system, measuring the signal to noise ratio EJI o , or other tests that assist in determining whether the candidate system is likely to be acquired, provided that the test requires less than time than a complete system acquisition and registration attempt.
  • the group of selected systems is reprioritized based on the results of the analysis.
  • all of the systems are sorted such that those systems having the highest likelihood of being acquired are selected first.
  • the order of desirability is maintained and, at each level of desirability, the selected systems are sorted using the analysis results.
  • the desirability information for each selected system is adjusted based on the analysis results and the group of selected systems is then sorted using the adjusted desirability information.
  • each system having a corresponding analysis result that is lower than a threshold value is removed from the group of selected systems.
  • the mobile station next attempts to acquire and register with a wireless communications system.
  • the system having highest level of priority is selected first from the reprioritized candidates list and an attempt is made to acquire and register with the selected system. Any system acquisition method may be used including conventional system acquisition methods that are well-known in the art. If the acquisition/registration attempt is not successful, then the wireless communications system having the next highest priority is selected from the candidate's list and another acquisition/registration is attempted. This process continues until a system acquisition/registration attempt is successful, or until there are no additional candidate systems. In a preferred embodiment, if the acquisition/registration attempt is successful the wireless communications system is used for future wireless communications services.
  • the acquired wireless communications system has a known geographic region and an attempt is made to acquire and register with a more preferred wireless communications system in the geographic region.
  • a first system is selected in accordance with a system acquisition procedure. Any system acquisition procedure may be used, including selecting the system that was the most recently used by the mobile station. The signal quality of the selected system is measured and if the system is not likely to be acquired, then the next system is selected in accordance with the system acquisition procedure. If a selected system is likely to be acquired then an attempt is made to acquire and register with the selected system. If the acquisition/registration attempt is successful then the wireless communications system is used for future wireless communications services. Otherwise, the next system is selected in accordance with the system acquisition procedure.
  • FIG. 1 illustrates a preferred embodiment of the present invention
  • Fig. 2 is a mobile station in accordance with a preferred embodiment of the present invention
  • Fig. 3a is a systems table in accordance with a preferred embodiment of the present invention.
  • Fig. 3b is an acquisition table in accordance with a preferred embodiment of the present invention.
  • Fig. 4 illustrates preferred lookup tables used by the mobile station in accordance with a preferred embodiment of the present invention
  • Fig. 5 is a flow diagram illustrating a preferred system selection and acquisition procedure
  • Fig. 6 is a flow diagram illustrating an alternative system selection and acquisition procedure.
  • a mobile station 2 operates in a geographic region 4 that is serviced by at least one base station 6.
  • Each base station 6 is connected to a network 8, which is part of a larger wireless communications system that supports at least one multiple- access wireless communications protocol, such as code division multiple access (CDMA), wideband CDMA (WCDMA), Advanced Mobile Phone Service (AMPS), Global System for Mobile communications (GSM), General Packet Radio Services (GPRS) or High Data Rate (HDR) technology (e.g., IxEV technology).
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • AMPS Advanced Mobile Phone Service
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Services
  • HDR High Data Rate
  • the mobile station 2 may be any wireless device, whether stationary or mobile, that is adapted for wireless communications with at least one base station 6, such as a cellular telephone, pager, personal digital assistant (PDA), vehicle navigation system or portable computer.
  • the mobile station is a multi-mode device that is adapted to operate in both CDMA and AMPS modes.
  • the mobile station 2 includes a list of known wireless communications systems, such as preferred roaming list (PRL) 10.
  • PRL 10 is stored in a nonvolatile memory of the mobile station 2 and includes a list of wireless communications systems and corresponding acquisition parameters that are used by the mobile station 2 during attempts to acquire and register with a wireless communications system.
  • the wireless communications systems listed in the PRL 10 are grouped by geographic region and sorted from the most desirable to the least desirable system in each region.
  • the PRL 10 may be maintained by the mobile station's wireless service provider and include a list of wireless communications systems that are available to the mobile station 2 through its wireless service provider or other wireless service providers that have agreed to provide roaming services to the mobile station 2.
  • the mobile station 2 attempts to acquire and register with an available wireless communications system that offers wireless services to the mobile station 2.
  • a group of wireless communications systems is selected from the PRL 10 in accordance with a predetermined system acquisition procedure.
  • the group of systems has an order of priority that may be used by the mobile station 2 during system acquisition and registration attempts.
  • the wireless communications systems in the mobile station's geographic region 4 are selected and sorted from the most desirable to the least desirable system in each region.
  • received signals corresponding to each of the selected systems are analyzed to determine a relative likelihood that each of the corresponding systems would be acquired by the mobile station 2.
  • the group of wireless communications systems is then reprioritized based on the results of the analysis to produce a more efficient system acquisition order.
  • the mobile station 2 selects the system from the reprioritized group that has the highest relative priority and attempts to acquire and register with the selected system. If the acquisition registration attempt is successful, the selected system is used by the mobile station 2 for wireless communications. Otherwise, an attempt is made to acquire/register with the system from the group having the next highest priority.
  • the mobile station 2 includes processing circuitry 80, a memory 82, a communications transceiver 84 and an antenna 86.
  • the processing circuitry 80 preferably includes a control processor 90 for controlling the operation of the mobile station 2, a signal processor 92, a searcher 94 and a system determination unit 96.
  • the memory 82 preferably includes both volatile and nonvolatile random access memories that store a preferred roaming list, including a systems table 100 and an acquisition table 102.
  • the memory 82 may also store one or more lookup tables, such as a list of the most recently used systems 106, and program instructions for execution by the processing circuitry 80.
  • the searcher 94 is adapted to identify valid signals, such as pilot signals, synchronization channels and paging channels received by the transceiver 84 through the antenna 86.
  • valid signals such as pilot signals, synchronization channels and paging channels received by the transceiver 84 through the antenna 86.
  • the design and implementation of searcher hardware for CDMA acquisition is described in U.S. Patent No. 5,109,390, entitled "DIVERSITY RECEIVER TN A CDMA CELLULAR TELEPHONE SYSTEM,” assigned to the assignee of the present invention, and is inco ⁇ orated herein by reference.
  • the searcher 94 is further adapted to perform a preliminary acquisition analysis of one or more candidate communications systems.
  • the system determination unit 96 is adapted to select one or more wireless communications systems from the systems table 100 and retrieve corresponding acquisition parameters from the acquisition table 102.
  • the system determination unit 96 is further adapted to forward the acquisition parameters to the searcher 94, which attempts to acquire one the selected systems. In an alternative embodiment, the system determination unit 96 determines whether the current wireless communications system is the most desirable system in the mobile device's current geographic region and, when more desirable systems are available, initiates attempts by the mobile station 2 to acquire a more desirable system.
  • a method and apparatus for performing preferred system selection in a mobile station that is capable of operation in a plurality of geographic regions is disclosed in U.S. Patent No. 6,085,085, entitled "METHOD AND APPARATUS FOR PERFORMING PREFERRED SYSTEM SELECTION,” assigned to assignee, and is inco ⁇ orated herein by reference.
  • the mobile station 2 illustrated in Fig. 2 is merely illustrative and that alternative configurations and additional features are contemplated within the scope and spirit of the present invention.
  • the components of the mobile station 2 may be implemented in numerous hardware configurations using conventional circuit elements such as one or more processors, memories and application specific integrated circuits (ASICs).
  • the mobile station 2 may also be adapted for voice communications, high-speed data communications, video communications, internet applications such as email and World Wide Web access, position location (e.g., gpsOneTM developed by assignee), personal navigation, voice recognition, integrated removable storage devices and short-range wireless connectivity with local peripherals and devices.
  • the processing circuitry 80 includes a Mobile Station Modem chipset, developed by assignee, which integrates digital and analog functions along with GPS-based position location.
  • the systems table 100 includes a list of wireless communications systems that the mobile station 2 uses during attempts to acquire and register with a wireless communications system.
  • each record in the systems table 100 preferably includes a system identifier (SID) 100a, a network identifier (NLO) 100b, an indication of whether the system is preferred or negative (P/N) 100c, an identifier of the geographic region (Region) lOOd that is covered by the system, desirability information lOOe and a pointer (AT Pointer) lOOf to a record in the acquisition table 102.
  • Each wireless communications system listed in the systems table 100 is identified through a unique SID 100a, NID 100b pair and is designated as either a preferred system that may be used by the mobile station 2 during roaming, or a negative system that should not be used by the mobile device 2 during roaming through P/N 100c.
  • the wireless communications systems listed in the systems table 100 may be identified using other system identifiers, such as a unique band, mode and frequency, and Internet Protocol Version 6 (IPV6) address or a Public Land Mobile Network (PLMN) identifier.
  • IPV6 Internet Protocol Version 6
  • PLMN Public Land Mobile Network
  • the wireless communications systems are preferably grouped by geographic region lOOd and stored in the systems table 100 in sorted order from the most desirable system to the least desirable system in each region using the desirability information lOOe.
  • the acquisition table 102 includes a list of parameters that are necessary for the acquisition of the wireless communications systems listed in the systems table 100. As illustrated, each record in the acquisition table 102 preferably includes a mode 102a, a band 102b and a frequency 102c.
  • the systems table 100 and the acquisition table 102 are preferably stored in a nonvolatile memory and updated periodically by an external source, such as the mobile station's wireless service provider, through downloads across a wireless connection or through another data transfer method. It will be appreciated that alternative configurations for the PRL, the systems table 100 and the acquisition table 102, and alternative identification and acquisition parameters may be used in accordance with the present invention.
  • the memory also includes one or more lookup tables 104.
  • the lookup tables include a most recently used (MRU) systems table 104a that stores a list of the systems most recently used by the mobile station 2, a candidates list 104b that includes a list of systems that have been selected as candidates for acquisition, and a preferences table 104c that maintains local preference settings for the mobile station 2.
  • MRU most recently used
  • Other information may also be stored in a lookup table including historical information that tracks the use of each system.
  • the lookup tables are preferably stored in volatile portion of the memory 24, but in alternate embodiments, one or more of the lookup tables may be stored in a nonvolatile portion of the memory 24.
  • a preferred system acquisition sequence for the mobile station 2 will now be described with reference to Fig. 2 and the flow diagram of Fig. 5.
  • the system acquisition sequence is preferably performed by the system determination unit 96.
  • Step 200 a group of wireless communications systems is selected from a stored list of systems in accordance with a predetermined system acquisition procedure.
  • wireless communications systems in the mobile station's geographic region 4 are selected from the system table 100, and the corresponding system identifiers are stored in the candidates list 104b in the memory 24.
  • the candidates list 104b may include other data such as corresponding acquisition parameters and desirability information for the selected systems.
  • the candidates list 104b is preferably sorted in an initial order of priority (e.g., from the most desirable system to the least desirable system) as determined by the predetermined system acquisition procedure.
  • an initial order of priority e.g., from the most desirable system to the least desirable system
  • the system acquisition procedure may include selecting a group of systems from the MRU 104a or other stored systems lists.
  • the system table 100 specifies a preferred system acquisition order to be used by the mobile station 2 during system acquisition/registration attempts. This system acquisition order, however, is not always the most efficient system selection order for acquiring and registering with a wireless communications system.
  • the selection order specified by the system table 100 is typically determined by the mobile station's wireless services provider based on factors that are unrelated to the likelihood that each of the listed systems will be acquired by the mobile station 2. For example, the desirability of each system may be determined using criteria such as the cost of using the system, the quality of the communications service offered by the system, protocol used by the system, support for unique features and whether the mobile station 2 is listed as a subscriber of the wireless communications system.
  • the mobile station 2 analyzes a received signal corresponding to each of the systems in the candidates list 104b (Step 202) and adjusts the system acquisition order based on the results of the analysis (Step 204).
  • the analysis of the received signals includes measuring the received signal strength (Rx) of each system.
  • the searcher 94 steps through the systems identified in the candidates list 104b stored in the memory 24.
  • the candidates list may be transmitted to the searcher 94 from the system determination unit 96. For each listed system, the searcher 94 instructs the transceiver 84 to switch to the system's corresponding channel. The received signal strength is then measured and stored in the candidates list 104b.
  • the analysis of the received signals includes determining whether the received signal is likely to be a CDMA signal.
  • the system determination unit 96 instructs the searcher 94 to measure the signal to noise ratio EJI 0 , where E c is the strength of the received signal and I 0 is the , total thermal noise received on the channel.
  • E c the strength of the received signal
  • I 0 the , total thermal noise received on the channel.
  • this measurement provides an indication of the portion of the received signal that is usable. If the ratio EJI o is relatively large, then there is a high probability that the system could be acquired. The 1 ratio E c /I 0 provides a more reliable indication of whether the signal is likely to be acquired than the measured raw strength of the signal.
  • the system determination unit 96 and searcher 94 support multiple test modes and methods of acquisition, and may be adapted to use more than one type of analysis, alone or in combination.
  • the test mode may be determined by user preference, configuration of the mobile station, current operating state of the mobile station or other criteria.
  • the searcher 94 preferably operates in accordance with instructions received from the system determination unit 96 and the system determination unit 96 is adapted to transmit a candidate systems test instruction and a system acquisition instruction.
  • the candidate systems test instruction includes parameters to identify the candidate list, an identifier of the test to be performed on each candidate system and a minimum threshold value to be met by each system.
  • the searcher 94 executes the received instruction and returns the candidate systems that meet the testing requirements.
  • the searcher 94 modifies the candidates list stored in memory.
  • the system determination unit 96 is further adapted to analyze the test results and transmit a system acquisition instruction to the searcher 94, including parameters identifying the candidates lists.
  • Step 204 the group of selected systems is reprioritized based on the analysis to produce a more efficient system acquisition order.
  • all of the systems are sorted such that those systems having the highest likelihood of being acquired are selected first.
  • a plurality of the selected systems have the same level of desirability.
  • the selected systems are sorted using measured signal strength, from the most likely system to be acquired to the least likely system to be acquired.
  • the desirability information for each selected system is adjusted based on the test measurement.
  • the relative desirability of systems having a signal strength measurement greater than a first threshold value may be adjusted upward, while the relative desirability of systems having a signal strength lower than a second threshold value may be adjusted downward.
  • the group of selected systems is then sorted using the adjusted desirability information.
  • systems having a tested signal quality that is lower than a threshold value are removed from the group of selected systems.
  • candidate systems that have a corresponding measured signal strength lower than -90db may be eliminated from the candidates list.
  • Other criteria may also be used to eliminate and sort candidate systems. For example, a weighting factor may be used that takes into account the measured signal strength, whether the system was recently used, the desirability rating and other information.
  • the mobile station 2 After the group of selected systems is reprioritized, the mobile station 2 attempts to acquire and register with one of the wireless communications systems in the group.
  • the system having highest level of priority is selected from the candidates list 104b.
  • this system has a relatively high desirability level and a high likelihood that the acquisition/registration attempt will be successful based on a measured signal quality such as a signal strength measurement.
  • An attempt is made to acquire and register with the selected system in Step 208. Any system acquisition method may be used including conventional system acquisition methods that are well-known in the art.
  • the mobile station 2 is adapted to acquire a CDMA system.
  • the searcher 94 instructs the transceiver 84 to switch to the communications channel of the selected CDMA system and listens for a pilot signal.
  • the searcher 94 attempts to verify the received pilot signal by testing various pseudorandom noise (PN) offsets in the received signal until a match is found.
  • PN pseudorandom noise
  • the processing circuitry 80 receives information for the forward CDMA channel and a phase reference for signal demodulation.
  • the processing circuitry 80 attempts to acquire the synchronization channel associated with the identified pilot channel.
  • the synchronization channel transmits basic system information such as the unique SID/NTD of the transmitting wireless communications system and network, and synchronization information.
  • the processing circuitry 80 adjusts its timing in accordance with the received information and then switches to the base station's paging channel.
  • the paging channel is used by a local base station of the current communications system to communicate with the mobile station 2 when the mobile station 2 is not assigned to a traffic channel. Through the paging channel, the base station notifies the mobile station 2 of incoming messages, such as an incoming telephone call or a notification of a received voicemail message. [0039] If the acquisition registration attempt is successful (Step 210) then the selected system is used by the mobile station 2 for wireless communications. If the acquisition/registration attempt is not successful, the wireless communications system having the next highest priority is selected from the candidate's list in Step 212 and control returns to Step 208 for the next acquisition/registration attempt.
  • Step 210) the searcher 94 will attempt to acquire each of the remaining systems according to the selection order until a wireless communications system is acquired or the candidate systems are exhausted.
  • the process returns to Step 200 for the selection of a group of systems in the current geographic region that are more desirable than the selected system.
  • An alternative system acquisition sequence is illustrated in the flow diagram of Fig. 6.
  • Step 250 a first system is selected in accordance with a system acquisition procedure. Any system acquisition procedure may be used, including selecting the system that was the most recently used by the mobile station 2. The signal quality of the selected system is measured in Step 252.
  • Step 254 If the system is likely to be acquired (Step 254) then an attempt is made to acquire and register with the selected system in Step 256. In a preferred embodiment, the system is likely to be acquired if the measured signal quality exceeds a predetermined threshold value. If the system is not likely to be acquired, then the next system is selected in accordance with the system acquisition procedure in Step 260. If the acquisition/registration attempt is successful (Step 258) then the mobile station 2 uses the selected system for future wireless communications services. If the acquisition/registration attempt is not successful then the next wireless communications system is selected in Step 260 and control returns to Step 252.

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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)

Abstract

Une station mobile comprend des circuits de traitement et une mémoire. Un groupe de systèmes de communication sans fil est sélectionné selon une procédure d'acquisition de systèmes prédéterminé. L'analyse d'un signal reçu correspondant à chacun des systèmes permet de déterminer quelles sont les chances d'acquisition du système sélectionné par la station mobile. L'ordre de priorité des systèmes sélectionnés est réagencé en fonction des résultats de l'analyse, ce qui débouche sur une séquence d'acquisition de systèmes plus efficace. La station mobile tente alors d'acquérir le système de communication sans fil sélectionné selon la séquence d'acquisition de systèmes.
PCT/US2003/003625 2002-02-05 2003-02-05 Procede et dispositif de selection et d'acquisition efficaces de systemes de communication sans fil WO2003067918A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
KR10-2004-7011943A KR20040077931A (ko) 2002-02-05 2003-02-05 무선 통신 시스템의 효율적인 선택 및 획득의 방법 및장치
AU2003219717A AU2003219717A1 (en) 2002-02-05 2003-02-05 Method and apparatus for efficient selection and acquisition of a wireless communications system
BRPI0307440-4A BR0307440A (pt) 2002-02-05 2003-02-05 método e equipamento para seleção e aquisição eficientes de um sistema de comunicações sem fio
CA002474506A CA2474506A1 (fr) 2002-02-05 2003-02-05 Procede et dispositif de selection et d'acquisition efficaces de systemes de communication sans fil
EP03715987A EP1472899A1 (fr) 2002-02-05 2003-02-05 Procede et dispositif de selection et d'acquisition efficaces de systemes de communication sans fil
MXPA04007544A MXPA04007544A (es) 2002-02-05 2003-02-05 Metodo y aparato para seleccion y adquisicion eficiente de un sistema de comunicaciones inalambricas.
JP2003567124A JP2006504291A (ja) 2002-02-05 2003-02-05 無線通信システムの効率的選択と取得のための方法および装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US35574202P 2002-02-05 2002-02-05
US60/355,742 2002-02-05
US10/092,700 2002-03-06
US10/092,700 US20040203745A1 (en) 2002-03-06 2002-03-06 Method and apparatus for efficient selection and acquisition of a wireless communications system

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EP (1) EP1472899A1 (fr)
JP (1) JP2006504291A (fr)
KR (1) KR20040077931A (fr)
CN (1) CN1628482A (fr)
AU (1) AU2003219717A1 (fr)
BR (1) BR0307440A (fr)
CA (1) CA2474506A1 (fr)
MX (1) MXPA04007544A (fr)
RU (1) RU2004126674A (fr)
WO (1) WO2003067918A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004036946A1 (fr) * 2002-10-14 2004-04-29 Siemens Aktiengesellschaft Appareil terminal mobile et procede permettant de selectionner un reseau radiotelephonique mobile
EP1519615A3 (fr) * 2003-09-29 2006-05-17 Kabushiki Kaisha Toshiba Appareil de communication sans fil pour sélectionner un méthode d'accès et procédé de communication sans fils correspondant
KR100606782B1 (ko) 2004-06-21 2006-08-01 엘지전자 주식회사 다중모드 이동단말기와, 그의 위치정보를 이용한통신서비스 전환 방법
WO2006109124A3 (fr) * 2005-04-14 2006-12-07 Nokia Corp Procede, appareil et programme d'ordinateur assurant une selection rapide de reseau dans un dispositif a modes multiples
KR100656038B1 (ko) 2003-09-04 2006-12-11 삼성전자주식회사 광대역 무선 접속 통신 시스템에서 이동 가입자 단말기의드롭 발생에 따른 서빙 기지국 선택 시스템 및 방법
WO2006109159A3 (fr) * 2005-04-14 2007-03-01 Nokia Corp Procede et appareil et programme informatique fournissant une liste de priorites de systeme associee au reseau pour selection de systeme multimode
WO2008142529A2 (fr) * 2007-05-22 2008-11-27 Telefonaktiebolaget Lm Ericsson (Publ) Procédé et système pour une commande radio à base d'interférence inter-système
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KR101149200B1 (ko) * 2004-05-25 2012-05-25 모토로라 모빌리티, 인크. 시스템 선택을 위한 장치 및 방법
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US9258769B2 (en) 2007-02-12 2016-02-09 Google Technology Holdings LLC Apparatus, method and computer program product providing priority setting for multi-rat interworking
US9508933B2 (en) 2014-09-15 2016-11-29 Boe Technology Group Co., Ltd. Organic light-emitting diode (OLED) device, manufacturing method thereof and display device
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Cited By (20)

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Publication number Priority date Publication date Assignee Title
WO2004036946A1 (fr) * 2002-10-14 2004-04-29 Siemens Aktiengesellschaft Appareil terminal mobile et procede permettant de selectionner un reseau radiotelephonique mobile
KR100656038B1 (ko) 2003-09-04 2006-12-11 삼성전자주식회사 광대역 무선 접속 통신 시스템에서 이동 가입자 단말기의드롭 발생에 따른 서빙 기지국 선택 시스템 및 방법
EP1519615A3 (fr) * 2003-09-29 2006-05-17 Kabushiki Kaisha Toshiba Appareil de communication sans fil pour sélectionner un méthode d'accès et procédé de communication sans fils correspondant
KR101149200B1 (ko) * 2004-05-25 2012-05-25 모토로라 모빌리티, 인크. 시스템 선택을 위한 장치 및 방법
KR100606782B1 (ko) 2004-06-21 2006-08-01 엘지전자 주식회사 다중모드 이동단말기와, 그의 위치정보를 이용한통신서비스 전환 방법
US7809379B2 (en) 2004-06-21 2010-10-05 Lg Electronics Inc. Multi-mode mobile terminal and method of triggering communication service using position information thereof
US7689218B2 (en) 2005-04-14 2010-03-30 Nokia Corporation Method, apparatus and computer program providing network-associated system priority list for multimode system selection
WO2006109124A3 (fr) * 2005-04-14 2006-12-07 Nokia Corp Procede, appareil et programme d'ordinateur assurant une selection rapide de reseau dans un dispositif a modes multiples
EP1872614A4 (fr) * 2005-04-14 2013-02-20 Nokia Corp Procede, appareil et programme d'ordinateur assurant une selection rapide de reseau dans un dispositif a modes multiples
CN101185360A (zh) * 2005-04-14 2008-05-21 诺基亚公司 在多模设备中提供快速网络选择的方法、装置
EP1872614A2 (fr) * 2005-04-14 2008-01-02 Nokia Corporation Procede, appareil et programme d'ordinateur assurant une selection rapide de reseau dans un dispositif a modes multiples
WO2006109159A3 (fr) * 2005-04-14 2007-03-01 Nokia Corp Procede et appareil et programme informatique fournissant une liste de priorites de systeme associee au reseau pour selection de systeme multimode
US7937083B2 (en) 2005-04-14 2011-05-03 Nokia Corporation Method, apparatus and computer program providing for rapid network selection in a multimode device
US9258769B2 (en) 2007-02-12 2016-02-09 Google Technology Holdings LLC Apparatus, method and computer program product providing priority setting for multi-rat interworking
WO2008142529A3 (fr) * 2007-05-22 2009-01-15 Ericsson Telefon Ab L M Procédé et système pour une commande radio à base d'interférence inter-système
WO2008142529A2 (fr) * 2007-05-22 2008-11-27 Telefonaktiebolaget Lm Ericsson (Publ) Procédé et système pour une commande radio à base d'interférence inter-système
US8441950B2 (en) 2007-05-22 2013-05-14 Telefonaktiebolaget L M Ericsson (Publ) Method and system for inter-system interference based radio control
US8588738B2 (en) 2007-10-01 2013-11-19 Qualcomm Incorporated Mobile access in a diverse access point network
US9955413B2 (en) 2014-03-28 2018-04-24 Huawei Device (Dongguan) Co., Ltd. Roaming network access method and apparatus
US9508933B2 (en) 2014-09-15 2016-11-29 Boe Technology Group Co., Ltd. Organic light-emitting diode (OLED) device, manufacturing method thereof and display device

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AU2003219717A1 (en) 2003-09-02
EP1472899A1 (fr) 2004-11-03
CN1628482A (zh) 2005-06-15
RU2004126674A (ru) 2006-01-27
KR20040077931A (ko) 2004-09-07
JP2006504291A (ja) 2006-02-02
CA2474506A1 (fr) 2003-08-14
MXPA04007544A (es) 2004-11-10
BR0307440A (pt) 2006-12-19

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