WO2004054136A1 - 無線通信端末及びハンドオフ判定方法 - Google Patents
無線通信端末及びハンドオフ判定方法 Download PDFInfo
- Publication number
- WO2004054136A1 WO2004054136A1 PCT/JP2003/015781 JP0315781W WO2004054136A1 WO 2004054136 A1 WO2004054136 A1 WO 2004054136A1 JP 0315781 W JP0315781 W JP 0315781W WO 2004054136 A1 WO2004054136 A1 WO 2004054136A1
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- WO
- WIPO (PCT)
- Prior art keywords
- communication
- handoff
- base station
- determination
- communication method
- Prior art date
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
Definitions
- the present invention relates to a wireless communication terminal and a handoff determination method.
- the present invention relates to a wireless communication terminal and a handoff determination method in a hybrid wireless communication terminal that performs communication by switching between two communication systems.
- a dual-type wireless communication terminal is known as a wireless communication terminal capable of switching between two communication systems and performing write communication with a base station.
- Patent Document 1 Japanese Patent Application Laid-Open No. 09-1772675
- the wireless communication state of the other communication method is measured during communication using one communication method, and the incoming call is monitored.
- a system that can perform the above method is called a hybrid system.
- this hybrid wireless communication terminal in particular, a hybrid wireless communication terminal consisting of a cdma 2000 lx system mainly for voice communication and a 1x EVDO system dedicated to data communication, 1X EVDO is performing data communication. While monitoring, 1xE VDO data communication is suspended at predetermined intervals (for example, every 5.12 seconds) to monitor incoming calls of cdma 2000. Switch to lx and monitor the system with cdma 2000 1x. After that, when the system monitoring processing is completed, the antenna and radio section are switched again to 1 XE VD ⁇ and 1 XE VDO data communication is resumed.
- the area where the wireless communication terminal is located is a cdma2000 1x system, near the boundary of the service area of multiple base stations (when the reception quality (CZI value) of signals from multiple base stations is competitive) ),
- the cdma2000 1x system is idle handoff (standby Off) frequently.
- C dm a 2000 1 at the predetermined interval for the X incoming monitor switches from 1 X EVDO system cdma 200 0 1 X system, the force for system monitoring process c dma 2000 lx s, when the c dm a 2000 1x
- the antenna and radio section of the wireless communication terminal will be c dm a 2000 lx
- the XEVDO system determines that the radio wave has been cut off and suspends communication (see Fig. 4). Therefore, regardless of the radio wave condition of the 1X EVDO system during the 1X EVDO data communication, the data communication of the 1X EVDO system is disconnected due to the repeated idle handoff of the cdma2000 1x system. Disclosure of the invention
- the present invention has been made in view of the above-described problem, and has been developed in a hybrid communication terminal that performs communication with a base station by switching between two systems, a cdma2000 lx system and a 1X EVDO system.
- the purpose of the present invention is to provide a wireless communication terminal in which unexpected communication interruption does not occur during 1x EVDO system data communication even in a radio wave state where idle handoff is frequently repeated on the system side.
- a first invention provides a wireless communication terminal that performs wireless communication with a base station in each communication system using a first communication system and a second communication system, and is capable of standby in both systems.
- Measuring means for measuring the quality of a signal transmitted by the base station handoff determining means for determining a handoff during standby in the second communication scheme based on the quality of signals transmitted from the standby base station and another base station,
- a wireless communication terminal comprising: control means for changing a determination criterion for standby handoff in the second communication method according to a state of the first communication method.
- the control means when the first communication mode is in standby, makes a first determination in a handoff determination during standby in the second communication mode.
- a constant reference value is set, and when the first communication method is performing communication, a second determination reference value is set for handoff determination during standby in the second communication method.
- the control means is configured to reduce the frequency of handoff of the second communication method as compared with the second criterion value compared to the first criterion value. It is characterized by setting.
- the first communication system is a 1 ⁇ EVDO system
- the second communication system is a cdma20001 system.
- a fifth invention provides a handoff determination method for a wireless communication terminal that performs wireless communication with a base station in each of the communication systems using the first communication system and the second communication system, and can wait in both systems. Changing a handoff determination criterion of the second communication method according to a state of the first communication method, and determining a handoff in the second communication method based on the changed handoff determination criterion. I do.
- the second criterion value is set so that the frequency of handoff of the second communication method is reduced as compared with the first criterion value. It is characterized by.
- the first communication method is a 1XE VD ⁇ system
- the second communication method is a cdma20001 system. It is characterized by. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a block diagram of a wireless communication terminal according to an embodiment of the present invention.
- FIG. 2 is a time chart showing the operation state of the 1 XE VD ⁇ system and the cdma20000lx system.
- FIG. 3 is an explanatory diagram of a conventional idle handoff determination in a cdma200001x system.
- FIG. 4 is an explanatory diagram of a conventional idle handoff determination in a cdma20001x system.
- FIG. 5 is a flowchart of the processing of the threshold value of the idle handoff during communication of the wireless communication terminal according to the embodiment of the present invention.
- FIG. 6 is an explanatory diagram of the determination of idle handoff in the cdma2000001x system according to the embodiment of the present invention.
- FIG. 1 is a block diagram illustrating a configuration of a wireless communication terminal according to an embodiment of the present invention.
- the radio communication terminal according to the present embodiment selectively switches between a cdma 2 0 0 1 1x communication system and a lx EVDO (lx Evolution Data at Only) communication system to form a base station 10 10
- It is a wireless communication terminal that can perform communication while moving by handing off between the OA and the base station 100B.
- the antenna 10 converts a high-frequency signal from the radio unit 20 into radio waves and transmits the radio waves to the base stations 100A and 100B, and receives radio waves from the base stations 100A and 100B. To the radio section 20 as a high-frequency signal.
- the radio unit 20 converts the high-frequency signal sent from the antenna 10 into a baseband signal, sends it to the radio processing units 40 and 50 via the switching unit 30, and , 50, and converts the baseband signal sent via the switching unit 30 into a high-frequency signal and sends it to the antenna 10.
- the switching unit 30 selectively transmits the baseband signal from the lx EVDO radio processing unit 40 or cdma 200 00 1 x radio processing unit 50 to the radio unit 20 and also transmits the baseband signal from the radio unit 20.
- the band signal is selectively sent to the 1 XE VDO radio processing unit 40 or the cdma 20000 1 x radio processing unit 50.
- the signal is converted into a baseband signal and sent to the wireless unit 20 via the switching unit 30. Also, the baseband signal transmitted from the wireless unit 20 via the switching unit 30 is converted into a 1 ⁇ EVDO format data signal.
- the hybrid unit 60 is a control unit that selectively switches between two communication systems of 1 ⁇ EVDO and cdma 2000 lx to control the two communication systems, and includes a switching unit 30, a 1XEVDO wireless processing unit 40, cdma 2000 1 x Connected to the wireless processing unit 50 and controls each switching. In particular, during standby, the two communication systems are selectively switched at predetermined time intervals to wait for a call in both communication systems.
- a memory 70, a display unit 80, and an external I / O 90 are connected to the hybrid unit 60.
- the memory 70 is a storage unit that can write or read a control program, communication data, and the like of the wireless communication terminal as required.
- the display unit 80 is mainly configured by an LCD display or the like, and displays the status of the wireless communication terminal, communication data, and the like.
- the external I / O 90 is an interface that allows the wireless communication terminal to connect to an external device such as another personal computer or PDA, and to transmit and receive various data.
- Fig. 2 shows a time chart of this process.
- the antenna 10 and the radio unit 20 are switched to the cdma 200 00 lx system side (at this time, the lx EVDO goes into a standby state (Inactive)), and the cdma 200 1 system Performs an incoming call detection process of receiving a call message transmitted from the base station.
- the state of the signal transmitted from the base station is monitored.
- the state of the pilot signal (C / I value, RSSI, etc.) transmitted from the base station of the cdma200001x system is poor, the cdma2001x system will perform the Dooff is performed.
- the 1X EVDO system operates the radio wave interruption monitoring timer and measures the time of the electric wave interruption state.
- the cdma200001X system releases the antenna 10 and the radio unit 20 and shifts to a standby state (Inactive).
- the mode is switched to the 1X EVDO system again.
- the 1X EVDO system side stops the radio wave interruption monitoring timer and restarts data communication to detect the radio wave again.
- Fig. 3 is a diagram showing the conventional idle handoff (handoff in the standby state) determination process of the cdma2000 1x system.
- the vertical axis represents the quality (C / I) of the signal transmitted from the base station
- the horizontal axis represents time
- the thick line represents the C / I value (Activ Pilot Strength) of the signal transmitted from the base station
- solid line represents base station A
- the dashed line is the CZ I value of the signal from the base station B
- the thin line is the C / I value of the signal transmitted from the base station plus the threshold value for the idle handoff determination (Idle Reference
- the solid line indicates the value obtained by adding ⁇ to the C / I value of the signal from base station A
- the dashed line indicates the value obtained by adding C to the C / I value of the signal from base station ⁇ ⁇ ⁇ ⁇ .
- the cdma2000 1x system receives radio waves from two base stations A (BS A) and B (BS B) and calculates the cZ I value of the signal from each base station.
- the CZI value of base station B becomes larger than the C / I value of base station A (thick solid line). If the wireless communication terminal exceeds the value (thin solid line) obtained by adding the CZ I value of the idle handoff determination threshold ⁇ to the idle handoff determination, the idle handoff from the base station ⁇ to the base station ⁇ is determined. ) I do.
- the CZI value of base station A is greater than the C / I value of base station B (thick broken line), and is the sum of the C / I value of base station B and the threshold value of the idle handoff decision threshold. If it exceeds (thin solid line), the wireless communication terminal determines that idle handoff is necessary, and performs idle handoff (2) from base station B to base station A.
- FIG. 4 is a diagram showing a conventional determination of idle-end handoff in a state where idle handoff frequently occurs.
- the thick solid line indicates the C / I value of the signal from base station A
- the thick broken line indicates the C / I value of the signal from base station B
- the thin solid line indicates the base.
- the thin dashed line represents the value obtained by adding the idle handoff decision threshold to the signal from the base station ⁇ . ing.
- FIG. 4B shows the communication state between the 1 ⁇ EVDO system and the cdma 2000 ⁇ system.
- Fig. 4 (a) when 1 XE VDO is communicating and idle handoff is frequently performed in the cdma 2000 lx system, that is, the cdma 20001X system is in standby state (Inactive). If the idle handoff occurs repeatedly before the transition to the state, the antenna 10 and the radio unit 20 of the wireless communication terminal are occupied by the cdma2000 lx system, and the apparatus cannot transition to the standby state.
- the 1X EVDO system measures the time of the radio wave disconnection state using the monitoring timer described above, but if the radio wave disconnection state exceeds a predetermined time (Supper Vision Time), the 1 x EVDO system The system determines that the radio wave from the base station has been interrupted, that is, the system has been lost due to the out-of-service state (SystemLost), performs processing for terminating data communication, and terminates communication.
- SystemLost out-of-service state
- the base station for the 1x EVDO system and the base station for the cdma2000 1x system are not necessarily co-located, and the cell ranges of both systems may not be the same. Therefore, despite the fact that the 1X ED VO system communicates with sufficient radio wave quality, the 1x EDVO system side This results in the disconnection of data communication.
- the wireless communication terminal of the present embodiment in order to avoid the occurrence of a 1 x EVDO system communication interruption due to continuous idle handoff caused by radio wave conditions on the cdma 2000 lx system side, 1 XE If the VDO system is communicating data, idle handover on the cdma2000 1x system The threshold value of the handoff is further corrected by adding a predetermined correction value, and the threshold value for determining whether to perform handoff is changed to reduce the frequency of occurrence of idle handoff.
- FIG. 5 is a flowchart showing a flow of processing during communication in the 1 ⁇ EVDO system of the wireless communication terminal according to the present embodiment.
- step 101 It is determined whether or not the wireless communication terminal has started data communication by the 1 ⁇ EVDO system (step 101). If the data communication has been started, the correction value ⁇ is added to the threshold value for the idle hand-off determination in the cdma200001X system (step 102).
- step 103 it is determined whether the data communication by the 1 ⁇ EVD ⁇ system has been completed.
- the threshold value is returned to the normal idle handoff determination threshold ⁇ (step 104).
- FIG. 6 is a diagram illustrating a method of determining an idle handoff when the idle handoff determination value is changed by the above processing.
- the vertical axis represents the quality ⁇ C / I) of the signal transmitted from the base station
- the horizontal axis represents time.
- the bold line indicates the CZ I value of the signal transmitted from the base station
- solid line indicates the CZ I value of the signal from base station A
- broken line indicates the C / I value of the signal from base station B
- the thin line indicates the CZ I value of the signal from base station B.
- the value obtained by adding the threshold value and correction value for handoff determination to the C / I value of the signal transmitted from the base station] 3 (Similarly, the solid line is the value obtained by adding +0 to the C / I value of the signal from base station A.
- the broken line indicates the value obtained by adding +] 3 to the C / I value of the signal from the base station B).
- FIG. 6B shows a communication state between the 1 ⁇ EVDO system and the cdma20001 ⁇ system.
- Fig. 6 (a) as in Fig. 4 (a), the reception quality of base station A and the reception quality of base station B are competing, and the cdma 20001x system repeats idle handoff
- the idle handoff is performed only once in the dotted line portion by adding the correction value] 3 to the threshold value ⁇ of the handoff determination by the processing of step 102 in FIG. 5 described above.
- cdma 2 0 0 1 1x system shifts to the standby state (Inactive) and 1xE Since the system is switched to VDO, the data communication processing of 1X EVDO can be restarted, and the data communication is not disconnected.
- This correction value] 3 is set in advance to an optimum value that can reduce the frequency of idle handoff by calculation or experiment from the positional relationship between the cdma2000 1x system base station and 1xEVDO base station. It is desirable to keep.
- the predetermined correction of cdma 2000 1x during the data communication of the 1 XE VDO system is not limited to the correction value, and may be, for example, a multiplication by a predetermined value. It suffices if the threshold value (judgment criterion) of the idle handoff determination is changed so that the idle handoff of the cdma 2000 1x system does not occur frequently.
- the cZ I value is used for the determination of idle handoff, but this may be used as the R SSI (received signal strength) value.
- communication is performed by switching between a cdma 2000 lx system used for both voice communication and data communication and a 1X EVDO system used only for data communication.
- cdma 2 000 Corrects the determination value of whether or not to perform idle handoff of the 1X system. 2000 1 x Even in areas where the system frequently performs idle handoffs, reducing the frequency of idle handoffs allows data communication to occur if the system does not switch to the 1XEVDO system and the signal loss condition exceeds a predetermined time. It is possible to reduce the occurrence of unexpected communication interruptions that can be terminated, to perform stable data communication, and to reduce data communication throughput. It is possible to above.
- the frequency of handoff in the second communication method can be reduced, so that the frequency of unexpected data communication disconnection in the first communication method decreases, In addition to performing stable data communication, it is possible to improve the throughput of user communication.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/538,263 US7233793B2 (en) | 2002-12-10 | 2003-12-10 | Wireless communication terminal and handoff judgment method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-357975 | 2002-12-10 | ||
JP2002357975A JP3916554B2 (ja) | 2002-12-10 | 2002-12-10 | 無線通信端末及びハンドオフ判定方法 |
Publications (1)
Publication Number | Publication Date |
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WO2004054136A1 true WO2004054136A1 (ja) | 2004-06-24 |
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ID=32500886
Family Applications (1)
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PCT/JP2003/015781 WO2004054136A1 (ja) | 2002-12-10 | 2003-12-10 | 無線通信端末及びハンドオフ判定方法 |
Country Status (5)
Country | Link |
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US (1) | US7233793B2 (ja) |
JP (1) | JP3916554B2 (ja) |
KR (1) | KR100683298B1 (ja) |
CN (1) | CN1723635A (ja) |
WO (1) | WO2004054136A1 (ja) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4431443B2 (ja) * | 2004-05-31 | 2010-03-17 | 京セラ株式会社 | 無線通信端末、ハンドオフ実行方法及びハンドオフ実行プログラム。 |
KR100638551B1 (ko) | 2004-09-06 | 2006-10-26 | 주식회사 케이티프리텔 | 대기 핸드오버를 하는 방법 및 장치 |
JP4804049B2 (ja) * | 2005-06-28 | 2011-10-26 | 京セラ株式会社 | 移動体通信端末及び移動体通信端末における通信制御方法 |
CA2565381C (en) | 2005-10-27 | 2015-01-13 | Research In Motion Limited | Apparatus, and associated method, for permitting communication system transition based upon signal threshold determination |
US7894375B2 (en) | 2005-10-31 | 2011-02-22 | Research In Motion Limited | Method, and associated apparatus, for transitioning communications of hybrid access terminal between communication systems |
CA2565225C (en) | 2005-10-27 | 2011-09-27 | Research In Motion Limited | Method and apparatus for transitioning between evdo and cdma 1x systems using redundant data call blockings |
CN101052203B (zh) * | 2006-04-06 | 2011-06-08 | 华为技术有限公司 | 多媒体广播组播业务的实现方法 |
KR100784324B1 (ko) | 2006-11-28 | 2007-12-13 | 삼성전자주식회사 | 이동통신 단말기에서 대기 전류 절약 장치 및 방법 |
DK2160914T3 (da) * | 2007-06-29 | 2012-10-08 | Nokia Corp | Undgåelse af ping-pong-handovers |
JP4672029B2 (ja) * | 2008-01-28 | 2011-04-20 | 京セラ株式会社 | 通信手段変更方法およびそれを利用した端末装置 |
JP5158489B2 (ja) * | 2008-02-28 | 2013-03-06 | 京セラ株式会社 | 無線端末装置および無線ネットワークシステム |
CN101321028B (zh) * | 2008-07-02 | 2012-06-06 | 中兴通讯股份有限公司 | 一种光同步传输设备主控板与业务单板间的通讯方法及系统 |
JP4846014B2 (ja) * | 2009-11-09 | 2011-12-28 | 京セラ株式会社 | 無線通信端末 |
CN102104811B (zh) * | 2009-12-22 | 2014-03-12 | 华为技术有限公司 | 减少光网络设备中光模块能耗的方法、设备和系统 |
CN102026237B (zh) * | 2010-12-21 | 2014-06-11 | 中兴通讯股份有限公司 | 一种更新hrpd无线掉话记录的方法及装置 |
US10779202B2 (en) * | 2013-07-02 | 2020-09-15 | Telefonaktiebolaget L M Ericsson (Publ) | Controlling connection of an idle mode user equipment to a radio access network node |
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- 2002-12-10 JP JP2002357975A patent/JP3916554B2/ja not_active Expired - Fee Related
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- 2003-12-10 US US10/538,263 patent/US7233793B2/en not_active Expired - Fee Related
- 2003-12-10 WO PCT/JP2003/015781 patent/WO2004054136A1/ja active Application Filing
- 2003-12-10 KR KR1020057010541A patent/KR100683298B1/ko not_active IP Right Cessation
- 2003-12-10 CN CNA2003801054333A patent/CN1723635A/zh active Pending
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JPH0730945A (ja) * | 1993-06-24 | 1995-01-31 | N T T Idou Tsuushinmou Kk | 移動通信チャネル切替方式および移動局装置 |
JPH11239375A (ja) * | 1998-02-23 | 1999-08-31 | Fujitsu Ltd | 移動通信システムにおけるチャネル切替方式 |
JP2000201369A (ja) * | 1998-12-02 | 2000-07-18 | Infineon Technol North America Corp | 世代間のソフトハンドオフを実現する方法、移動局および無線電話システム |
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Also Published As
Publication number | Publication date |
---|---|
KR100683298B1 (ko) | 2007-02-15 |
JP3916554B2 (ja) | 2007-05-16 |
KR20050085519A (ko) | 2005-08-29 |
US20060035638A1 (en) | 2006-02-16 |
JP2004193852A (ja) | 2004-07-08 |
CN1723635A (zh) | 2006-01-18 |
US7233793B2 (en) | 2007-06-19 |
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