JP2001268616A - Method for base station selection based upon connection failure history - Google Patents
Method for base station selection based upon connection failure historyInfo
- Publication number
- JP2001268616A JP2001268616A JP2000078215A JP2000078215A JP2001268616A JP 2001268616 A JP2001268616 A JP 2001268616A JP 2000078215 A JP2000078215 A JP 2000078215A JP 2000078215 A JP2000078215 A JP 2000078215A JP 2001268616 A JP2001268616 A JP 2001268616A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- terminal
- connection
- history
- connection failure
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、移動通信システム
において端末が基地局に接続する際の、基地局を選択す
る方法に関する。The present invention relates to a method for selecting a base station when a terminal connects to the base station in a mobile communication system.
【０００２】[0002]
【従来の技術】従来技術は、端末が基地局を選択する
際、各基地局の受信電力など、その時点における基地局
との間の通信品質等の状況のみを考慮して、最適な基地
局を選択する。また、特許第2626597号「セルラ型移動
無線通信方式における無線基地局の選択方法」のよう
に、基地局から報知されるチャネル使用率を参照する方
法もある。2. Description of the Related Art In the prior art, when a terminal selects a base station, an optimum base station is considered by taking into account only the situation such as the reception power of each base station and the quality of communication with the base station at that time. Select In addition, there is also a method of referring to a channel usage rate broadcast from a base station, as in Japanese Patent No. 2626597 “Method of selecting a radio base station in a cellular mobile radio communication system”.
【０００３】また、従来技術では、基地局への接続処理
時、基地局との間の通信品質の劣化などにより、基地局
で端末が受け付けられない場合や、基地局に端末の認証
データが無い等の理由で、基地局が端末の受け付けを拒
否した場合でも、端末ではそれらの基地局を記憶してお
くことはない。記憶をする場合でも、接続を失敗した理
由までは記憶せず、また、接続処理が終了すれば全てク
リアする。In the prior art, when a connection to a base station is processed, the terminal cannot be accepted by the base station due to deterioration of communication quality with the base station, or the base station has no terminal authentication data. Even if the base station refuses to accept the terminal for such a reason, the terminal does not store those base stations. Even when the information is stored, the reason for the connection failure is not stored, and when connection processing is completed, all the information is cleared.
【０００４】また、接続失敗時には、他の基地局への接
続を試み、接続候補となる基地局がない場合には、再度
基地局の検索を行なうが、次回の検索を行なうまでに
は、一定時間の間隔を置くなどして端末に過大な負荷を
かけたり消費電力を浪費することを避けるようにする。
このとき、新規立ち上げ端末とハンドオーバー端末には
区別がなく、全て同様に処理する。[0004] When a connection fails, connection to another base station is attempted, and if there is no base station as a connection candidate, a search for a base station is performed again. Avoid overloading the terminal or wasting power by leaving time intervals.
At this time, there is no distinction between the newly established terminal and the handover terminal, and all are processed in the same manner.
【０００５】従来の方法の例を図３に示す。図３の方法
では、端末は、接続に失敗した基地局の識別子を記憶し
ておき、基地局選択時にはそれらの基地局は対象外と
し、接続処理が終了するときに基地局情報をクリアす
る。FIG. 3 shows an example of a conventional method. In the method of FIG. 3, the terminal stores the identifier of the base station that failed to connect, excludes those base stations when the base station is selected, and clears the base station information when the connection processing ends.
【０００６】[0006]
【発明が解決しようとする課題】上記のように、基地局
の履歴をとらない方法では、端末が基地局への接続に失
敗して再度接続処理を行なう場合、再び同じ基地局を選
択することがありうる。このとき、状況が変わっていな
ければ、同様に接続に失敗することになる。これが繰り
返されると、基地局への接続に要する時間が長くなる。As described above, in the method in which the history of the base station is not obtained, if the terminal fails to connect to the base station and performs connection processing again, the same base station is selected again. There can be. At this time, if the situation has not changed, the connection will similarly fail. When this is repeated, the time required for connection to the base station becomes longer.
【０００７】また、ハンドオーバーと新規の立ち上げ端
末の区別をつけない方法では、ハンドオーバー時に通信
が中断される時間が長くなるという問題がある。[0007] In addition, the method in which handover is not distinguished from a newly set up terminal has a problem that the time during which communication is interrupted during handover becomes long.
【０００８】本発明は、端末が、過去に接続に失敗した
基地局に対し、再び接続を試みて同様に失敗することを
繰り返すことを回避し、他の条件のよい基地局へ接続す
ることにより、基地局への接続にかかる時間を短縮し、
また、ハンドオーバー端末と新規立ち上げ端末を区別し
て扱うことにより、ハンドオーバー時の通信の中断時間
を短縮した、接続失敗履歴に基づく基地局選択方法を提
供する。The present invention prevents a terminal from trying to connect to a base station that has failed in the past and repeating the same failure, and connects to a base station having other conditions that are favorable. , Reducing the time it takes to connect to a base station,
Also, a base station selection method based on a connection failure history is provided, in which a handover terminal and a newly set up terminal are treated differently, thereby shortening communication interruption time at the time of handover.
【０００９】[0009]
【課題を解決するための手段】端末が基地局に接続する
には、複数の処理を順次行なうことになる。端末が、周
囲の基地局を検索して、ある基地局を接続先として選択
した後で、接続処理中に何らかの異常が発生して接続に
失敗した場合、その基地局を端末で記憶しておく。この
履歴として残っている基地局は、履歴がクリアされるま
では、接続対象外となり端末はその基地局を選択しない
か、または基地局を選択する際の優先順位を低くする。
ここで、接続に失敗する理由にはさまざまなものが考え
られるが、これらを複数の接続失敗理由種別に分類して
おく。基地局の履歴を保存するとき、接続失敗理由種別
と基地局の識別子をセットで記憶しておく。履歴は、図
１のような形式で、端末で記憶しておく。各履歴の種類
ごとに、その履歴をクリアする契機が異なる。接続に失
敗した場合、回復に要する時間、すなわち、再び同じ基
地局に接続処理をして成功する状態に戻る時間が、接続
失敗理由により異なる。このため、基地局の履歴をクリ
アする契機を、接続失敗理由種別ごとに異なるようにし
ておき、履歴がクリアされた基地局は、状況が回復して
いることが期待されるため選択対象となるようにする。To connect a terminal to a base station, a plurality of processes are sequentially performed. After a terminal searches for a base station in the vicinity and selects a certain base station as a connection destination, if any abnormality occurs during connection processing and connection fails, the base station is stored in the terminal. . Until the history is cleared, the base station remaining as the history is excluded from the connection target, and the terminal does not select the base station or lowers the priority in selecting the base station.
Here, various reasons for connection failure can be considered, and these are classified into a plurality of connection failure reason types. When saving the history of the base station, the connection failure reason type and the identifier of the base station are stored as a set. The history is stored in the terminal in a format as shown in FIG. The trigger for clearing the history differs for each type of history. If the connection fails, the time required for recovery, that is, the time to return to a successful state after connecting to the same base station again differs depending on the reason for the connection failure. For this reason, the trigger for clearing the history of the base station is set to be different for each connection failure reason type, and the base station whose history is cleared is selected as the situation is expected to be recovered. To do.
【００１０】このように、端末が基地局への接続に失敗
した場合、接続に失敗した理由が、通信品質の劣化等の
一時的なものか、あるいは端末登録設定の誤り等の長期
的な問題であるかによって、再び同じ基地局に接続要求
を出した場合に接続に成功する確率が異なる。接続に成
功する確率が低いと考えられる間は、基地局の履歴を残
しておき、接続対象外とすることによって、端末が無駄
に基地局に対して接続処理を試みることが避けられるた
め、接続に要する時間が短縮される。[0010] As described above, when the terminal fails to connect to the base station, the reason for the failure may be a temporary cause such as deterioration of communication quality or a long-term problem such as an incorrect terminal registration setting. , The probability of successful connection when a connection request is issued to the same base station again differs. While it is considered that the probability of successful connection is low, the history of the base station is kept and excluded from the connection target, thereby preventing the terminal from trying uselessly to connect to the base station. The time required for is reduced.
【００１１】また、ハンドオーバー端末と新規立ち上げ
端末を区別してハンドオーバーによる品質劣化を防ぐ方
法は次のように行なう。通常、端末は基地局への接続に
失敗して、検索されている基地局では候補が無くなった
とき、再度周囲の基地局の検索を行なうが、このとき、
端末に負荷をかけないよう一定時間が経過してから基地
局の検索を行なう。しかし、ハンドオーバー端末は、通
信が中断される時間をできるだけ短くする必要がある。
そのため、次の基地局検索までの時間の間隔を、新規に
立ち上げる場合より短くする。これにより、ハンドオー
バー時の接続では、接続に要する時間が短縮されるた
め、ハンドオーバー時に通信が中断される時間が短くな
る。さらに、新規立ち上げ時の端末にかかる負荷も高く
ならない。A method for distinguishing a handover terminal from a newly established terminal and preventing quality degradation due to handover is performed as follows. Normally, when the terminal fails to connect to the base station and there are no more candidates in the searched base station, the terminal searches again for surrounding base stations.
A search for a base station is performed after a certain time has elapsed so as not to load the terminal. However, the handover terminal needs to minimize the time during which communication is interrupted.
Therefore, the time interval until the next base station search is set shorter than when newly starting up. Thereby, in the connection at the time of handover, the time required for the connection is reduced, and the time during which communication is interrupted at the time of handover is reduced. Further, the load on the terminal at the time of newly starting up does not increase.
【００１２】[0012]
【発明の実施の形態】図２に、実施形態の例を示す。こ
こで、接続失敗理由種別を、(Ａ)，(Ｂ)の２通りに分類
する。(Ａ)は、伝播環境の変化等による通信品質の劣化
など、短期的な問題が原因のものとする。(Ｂ)は、端末
の認証を基地局で行なうシステムにおいて基地局あるい
はシステムに端末が登録されていないなどの長期的な問
題が原因のものとする。FIG. 2 shows an example of the embodiment. Here, the connection failure reason types are classified into two types (A) and (B). (A) is caused by a short-term problem such as deterioration of communication quality due to a change in the propagation environment. (B) is caused by a long-term problem such as a terminal not being registered in a base station or a system in a system in which terminal authentication is performed by the base station.
【００１３】端末はまず周囲の基地局を検索し、接続可
能な基地局の候補を記憶しておく。次に、それらの中か
ら、接続失敗の履歴が残っているため接続対象外となる
基地局を候補から除く。この時点で、接続可能な基地局
が残っていない場合、再度基地局の検索を行なう。ただ
し、検索回数が一定回数に達している場合には、接続失
敗として処理を停止することにする。The terminal first searches for surrounding base stations and stores candidates for connectable base stations. Next, among them, base stations that are not connected because the connection failure history remains are excluded from candidates. At this point, if no connectable base station remains, the base station is searched again. However, if the number of searches has reached a certain number, the processing is stopped as a connection failure.
【００１４】候補として残った基地局の中から、条件が
最も優れている基地局を接続先基地局として選択し、接
続処理を行なう。接続処理において、通常、端末と基地
局の間で制御メッセージのやりとりがある。このメッセ
ージが途中で切れた場合には、通信品質の一時的な悪化
があると考えられるため、その基地局は履歴(Ａ)に加え
る。また基地局から、当該端末の接続を拒否する内容の
メッセージを受信した場合は、端末側に何らかの不備が
あると考えられるため、その基地局には長期的に接続で
きないとして履歴(Ｂ)に加える。接続に失敗した場合、
接続失敗履歴を参照して、検索されている他の基地局を
選択し、接続を試みる。接続可能な基地局が残っていな
い場合は、上記のように再度検索を行なう。[0014] From among the remaining base stations as candidates, the base station with the best conditions is selected as the connection destination base station, and connection processing is performed. In the connection process, control messages are usually exchanged between the terminal and the base station. If this message is interrupted halfway, it is considered that there is a temporary deterioration in communication quality, and the base station adds the message to the history (A). If a message indicating that the connection of the terminal concerned is rejected is received from the base station, it is considered that there is some defect on the terminal side, and it is determined that the terminal cannot be connected to the base station for a long time, and is added to the history (B). . If the connection fails,
Referring to the connection failure history, another searched base station is selected, and connection is attempted. If no connectable base stations remain, the search is performed again as described above.
【００１５】ここで、それぞれの履歴をクリアする契機
は以下のようにする。履歴(Ａ)は、短期的な原因である
ため、基地局の検索を行なうとき、および、接続に成功
したときに、クリアする。履歴(Ｂ)は、電源を切るか、
またはユーザから何らかの特別な指示があるまで履歴を
保持するとする。Here, the trigger for clearing each history is as follows. Since the history (A) is a short-term cause, it is cleared when searching for a base station and when connection is successful. History (B) can be turned off or
Alternatively, it is assumed that the history is retained until some special instruction is given from the user.
【００１６】また、図２に示すように、通常は基地局の
再検索を行なう際に、新規立ち上げ時は、再検索までの
間にインターバルを置くが、ハンドオーバー端末の場合
にはインターバルを置かないこととする。これにより、
ハンドオーバー端末の接続時間が短縮される。As shown in FIG. 2, when re-searching for a base station, an interval is normally provided until a new start-up, but in the case of a handover terminal, the interval is normally set. It will not be placed. This allows
The connection time of the handover terminal is reduced.
【００１７】[0017]
【発明の効果】本発明により、端末が基地局に接続する
とき、以前に接続に失敗した基地局の履歴を保持し、そ
の履歴をクリアする契機を接続失敗理由により異なるよ
うにして、再度接続を試みても失敗する確率が高い基地
局を選択対象外とすることにより、端末が基地局に接続
するのに必要な時間を短縮することができる。また、ハ
ンドオーバー端末と新規立ち上げ端末とで、基地局の再
検索時のインターバルの取り方を変えることにより、ハ
ンドオーバー端末の通信が中断される時間を短縮でき
る。According to the present invention, when a terminal connects to a base station, the history of the base station that previously failed to connect is retained, and the trigger for clearing the history differs depending on the reason of the connection failure, and the terminal is reconnected. By excluding a base station that has a high probability of failure even if the attempt is made, the time required for the terminal to connect to the base station can be reduced. In addition, by changing the interval for re-searching the base station between the handover terminal and the newly set up terminal, the time during which communication of the handover terminal is interrupted can be reduced.
【図１】基地局の履歴を示す図である。FIG. 1 is a diagram showing a history of a base station.
【図２】端末の接続手順を示す図である。FIG. 2 is a diagram showing a connection procedure of a terminal.
【図３】従来の端末の接続手順を示す図である。FIG. 3 is a diagram showing a conventional connection procedure of a terminal.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐藤 嬉珍 東京都新宿区西新宿三丁目19番２号 日本 電信電話株式会社内 Ｆターム(参考） 5K027 AA11 BB04 EE11 KK03 LL05 5K067 AA25 BB03 BB04 EE02 EE10 HH23 JJ12 JJ13 JJ39 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshinori Sato 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo F-term within Nippon Telegraph and Telephone Corporation (reference) 5K027 AA11 BB04 EE11 KK03 LL05 5K067 AA25 BB03 BB04 EE02 EE10 HH23 JJ12 JJ13 JJ39
Claims (4)
げられるか他の基地局からハンドオーバーして新たに基
地局への接続を行なうとき、端末が周辺の基地局を検索
し、最も条件のよい基地局を選択して、基地局に対して
接続処理を試み、接続に失敗した場合は他の基地局への
接続を試みる移動通信システムにおいて、 端末が接続に失敗する理由を予め複数の接続失敗理由種
別に分類しておき、端末が、接続先基地局を選択し接続
処理を試みたが失敗した場合には、選択した基地局の識
別子と、接続失敗理由種別の履歴を端末が記憶しておく
ことを特徴とする接続失敗履歴に基づく基地局選択方
法。When there is a plurality of base stations and a terminal is newly started up or is handed over from another base station and newly connects to the base station, the terminal searches for a nearby base station, and In a mobile communication system that selects a base station with good conditions, attempts connection processing to the base station, and attempts to connect to another base station if the connection fails, there are several reasons why the terminal fails to connect. If the terminal selects a connection destination base station and attempts connection processing, but fails, the terminal stores the identifier of the selected base station and the history of the connection failure reason type. A method of selecting a base station based on a connection failure history, wherein the method is stored.
る基地局を、接続先基地局として選択しない、あるい
は、基地局を選択する際の優先順位を低くすることを特
徴とする請求項１に記載の接続失敗履歴に基づく基地局
選択方法。2. The terminal according to claim 1, wherein the terminal does not select a base station having a connection failure history as a connection destination base station, or lowers a priority when selecting a base station. 2. The base station selection method based on the connection failure history according to 1.
履歴の接続失敗理由種別に応じて、基地局の履歴を消去
するタイミングと理由を変えることを特徴とする請求項
２に記載の接続失敗履歴に基づく基地局選択方法。3. The terminal according to claim 2, wherein the terminal changes the timing and reason for deleting the history of the base station according to the connection failure reason type in the history of the base station that has failed to connect in the past. Base station selection method based on connection failure history.
続先基地局の候補がなくなった場合、再度基地局の検索
を行なうシステムで、新規端末よりハンドオーバー端末
のほうが、再検索までの時間の間隔が短く設定されてい
ることを特徴とする接続失敗履歴に基づく基地局の再検
索方法。4. When a terminal attempts to connect to a base station and fails, and there are no more candidate base stations to connect to, a system for searching for a base station again. A method for re-searching for a base station based on a connection failure history, wherein the time interval is set short.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000078215A JP2001268616A (en) | 2000-03-21 | 2000-03-21 | Method for base station selection based upon connection failure history |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000078215A JP2001268616A (en) | 2000-03-21 | 2000-03-21 | Method for base station selection based upon connection failure history |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001268616A true JP2001268616A (en) | 2001-09-28 |
Family
ID=18595657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000078215A Pending JP2001268616A (en) | 2000-03-21 | 2000-03-21 | Method for base station selection based upon connection failure history |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001268616A (en) |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6959188B2 (en) | 2001-03-30 | 2005-10-25 | Matsushita Electric Industrial Co., Ltd. | CDMA portable telephone apparatus |
| JP2007088605A (en) * | 2005-09-20 | 2007-04-05 | Nec Corp | Mobile communication terminal and control method of switching cell |
| JP2007150779A (en) * | 2005-11-29 | 2007-06-14 | Nec Corp | Communication channel selection method, its control system and program |
| KR100747460B1 (en) | 2005-11-18 | 2007-08-09 | 엘지전자 주식회사 | Method for handover in mobile communication terminal |
| CN100353790C (en) * | 2004-07-20 | 2007-12-05 | 乐金电子(中国)研究开发中心有限公司 | Mobile phone with issuing unreceiving alarm function and controlling method |
| JP2008517545A (en) * | 2004-10-20 | 2008-05-22 | ノキア コーポレイション | Cell reselection to improve network interoperability |
| JP2008530961A (en) * | 2005-02-17 | 2008-08-07 | クゥアルコム・インコーポレイテッド | Apparatus and method for controlling data call origination based on previous occurrence attempts |
| JP2008546289A (en) * | 2005-05-27 | 2008-12-18 | ローズマウント インコーポレイテッド | Method for selecting a data communication provider in a field device |
| WO2009057544A1 (en) * | 2007-10-31 | 2009-05-07 | Mitsubishi Electric Corporation | Mobile communication system, base station, mobile station, and base station installation method |
| JP2009239918A (en) * | 2003-11-12 | 2009-10-15 | Research In Motion Ltd | Prioritization of data-capable network through reject code processing |
| US7647042B2 (en) | 2006-12-05 | 2010-01-12 | Research In Motion Limited | User interface methods and apparatus for processing voice call requests from a mobile station based on communication conditions |
| US7676249B2 (en) | 2006-12-05 | 2010-03-09 | Research In Motion Limited | Alert methods and apparatus for call appointments in a calendar application based on communication conditions of a mobile station |
| JP2011087294A (en) * | 2009-10-14 | 2011-04-28 | Ntt Docomo Inc | Method and facility for supporting mobility management in radio communication network |
| JP2011151730A (en) * | 2010-01-25 | 2011-08-04 | Kyocera Corp | Radio communication terminal |
| JP2012095314A (en) * | 2006-08-25 | 2012-05-17 | Qualcomm Inc | Selection of access point in communications system |
| JP2014158248A (en) * | 2013-01-17 | 2014-08-28 | Ntt Docomo Inc | Mobile communication terminal and radio access network device |
| JP2014534679A (en) * | 2011-10-07 | 2014-12-18 | アップル インコーポレイテッド | Cell selection using blacklist or whitelist |
| WO2015064068A1 (en) * | 2013-10-30 | 2015-05-07 | 日本電気株式会社 | Communication device |
| JP2016506158A (en) * | 2012-12-21 | 2016-02-25 | クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ | Method and apparatus for handling connection failures in a wireless communication system |
| KR101728519B1 (en) * | 2015-12-16 | 2017-04-19 | 경희대학교 산학협력단 | Method for scheduling in heterogeneous small cell network |
| US20210314841A1 (en) * | 2018-12-20 | 2021-10-07 | Denso Corporation | Communication terminal and computer program product for selecting base station to be connected |
| US11464068B1 (en) | 2021-02-25 | 2022-10-04 | Sprint Spectrum L.P. | Selection of access node to serve a device, with the selection being based on RRC connection establishment failure history as to at least one other device |
-
2000
- 2000-03-21 JP JP2000078215A patent/JP2001268616A/en active Pending
Cited By (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6959188B2 (en) | 2001-03-30 | 2005-10-25 | Matsushita Electric Industrial Co., Ltd. | CDMA portable telephone apparatus |
| US7689219B2 (en) | 2003-11-12 | 2010-03-30 | Research In Motion Limited | Data-capable network prioritization with reject code handling |
| US9326227B2 (en) | 2003-11-12 | 2016-04-26 | Blackberry Limited | Data-capable network prioritization with reject code handling |
| JP2009239918A (en) * | 2003-11-12 | 2009-10-15 | Research In Motion Ltd | Prioritization of data-capable network through reject code processing |
| CN100353790C (en) * | 2004-07-20 | 2007-12-05 | 乐金电子(中国)研究开发中心有限公司 | Mobile phone with issuing unreceiving alarm function and controlling method |
| JP2008517545A (en) * | 2004-10-20 | 2008-05-22 | ノキア コーポレイション | Cell reselection to improve network interoperability |
| US8660527B2 (en) | 2005-02-17 | 2014-02-25 | Qualcomm Incorporated | Control of data call origination based on prior origination attempts |
| JP4805956B2 (en) * | 2005-02-17 | 2011-11-02 | クゥアルコム・インコーポレイテッド | Apparatus and method for controlling data call origination based on previous occurrence attempts |
| JP2008530961A (en) * | 2005-02-17 | 2008-08-07 | クゥアルコム・インコーポレイテッド | Apparatus and method for controlling data call origination based on previous occurrence attempts |
| JP2011182453A (en) * | 2005-02-17 | 2011-09-15 | Qualcomm Inc | Apparatus and method for control of data call origination based on prior origination attempts |
| JP4801731B2 (en) * | 2005-05-27 | 2011-10-26 | ローズマウント インコーポレイテッド | Method for selecting a data communication provider in a field device |
| JP2008546289A (en) * | 2005-05-27 | 2008-12-18 | ローズマウント インコーポレイテッド | Method for selecting a data communication provider in a field device |
| JP2007088605A (en) * | 2005-09-20 | 2007-04-05 | Nec Corp | Mobile communication terminal and control method of switching cell |
| JP4706919B2 (en) * | 2005-09-20 | 2011-06-22 | 日本電気株式会社 | Mobile communication terminal and cell switching control method |
| KR100747460B1 (en) | 2005-11-18 | 2007-08-09 | 엘지전자 주식회사 | Method for handover in mobile communication terminal |
| JP2007150779A (en) * | 2005-11-29 | 2007-06-14 | Nec Corp | Communication channel selection method, its control system and program |
| US9049651B2 (en) | 2006-08-25 | 2015-06-02 | Qualcomm Incorporated | Selection of an access point in a communications system |
| JP2012095314A (en) * | 2006-08-25 | 2012-05-17 | Qualcomm Inc | Selection of access point in communications system |
| US8195177B2 (en) | 2006-12-05 | 2012-06-05 | Motorola Mobility, Inc. | User interface methods and apparatus for processing voice call requests from a mobile station based on communication conditions |
| US7647042B2 (en) | 2006-12-05 | 2010-01-12 | Research In Motion Limited | User interface methods and apparatus for processing voice call requests from a mobile station based on communication conditions |
| US7676249B2 (en) | 2006-12-05 | 2010-03-09 | Research In Motion Limited | Alert methods and apparatus for call appointments in a calendar application based on communication conditions of a mobile station |
| US8073494B2 (en) | 2006-12-05 | 2011-12-06 | Research In Motion Limited | Alert methods and apparatus for call appointments in a calendar application based on communication conditions of a mobile station |
| JP5242586B2 (en) * | 2007-10-31 | 2013-07-24 | 三菱電機株式会社 | Mobile communication system and mobile station |
| CN101843143A (en) * | 2007-10-31 | 2010-09-22 | 三菱电机株式会社 | Mobile communication system, base station, mobile station, and base station installation method |
| WO2009057544A1 (en) * | 2007-10-31 | 2009-05-07 | Mitsubishi Electric Corporation | Mobile communication system, base station, mobile station, and base station installation method |
| JP2011087294A (en) * | 2009-10-14 | 2011-04-28 | Ntt Docomo Inc | Method and facility for supporting mobility management in radio communication network |
| JP2011151730A (en) * | 2010-01-25 | 2011-08-04 | Kyocera Corp | Radio communication terminal |
| JP2014534679A (en) * | 2011-10-07 | 2014-12-18 | アップル インコーポレイテッド | Cell selection using blacklist or whitelist |
| JP2016506158A (en) * | 2012-12-21 | 2016-02-25 | クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ | Method and apparatus for handling connection failures in a wireless communication system |
| JP2014158248A (en) * | 2013-01-17 | 2014-08-28 | Ntt Docomo Inc | Mobile communication terminal and radio access network device |
| WO2015064068A1 (en) * | 2013-10-30 | 2015-05-07 | 日本電気株式会社 | Communication device |
| US9699821B2 (en) | 2013-10-30 | 2017-07-04 | Nec Corporation | Communication device |
| KR101728519B1 (en) * | 2015-12-16 | 2017-04-19 | 경희대학교 산학협력단 | Method for scheduling in heterogeneous small cell network |
| US20210314841A1 (en) * | 2018-12-20 | 2021-10-07 | Denso Corporation | Communication terminal and computer program product for selecting base station to be connected |
| US11871293B2 (en) * | 2018-12-20 | 2024-01-09 | Denso Corporation | Communication terminal and computer program product for selecting base station to be connected |
| US11464068B1 (en) | 2021-02-25 | 2022-10-04 | Sprint Spectrum L.P. | Selection of access node to serve a device, with the selection being based on RRC connection establishment failure history as to at least one other device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2001268616A (en) | Method for base station selection based upon connection failure history | |
| US7826845B2 (en) | Wireless network connection method and mobile phone using the same | |
| US7599693B2 (en) | Cell search method and mobile communication terminal | |
| US6223037B1 (en) | Cell selection during loss of service in a telecommunications system | |
| CN102484835B (en) | Obtain the method and system of adjacent cell information | |
| US7853215B2 (en) | Communication circuit and method for selecting a reference link | |
| US9066309B2 (en) | Method and apparatus for reducing successive pre-registration attempts by access terminals | |
| US20040121781A1 (en) | Wireless terminals that scan for alternate protocol systems responsive to terminal movement and methods of same | |
| US8463259B2 (en) | Servicing cell discovery during out of service | |
| US9264967B2 (en) | Method for background scan in a mobile wireless system | |
| US8682382B2 (en) | Portable terminal and its communication method, and wireless network system | |
| US6771960B1 (en) | Method for a cellular radiotelephone to scan for service from adjacent cells | |
| KR20040095958A (en) | Method for Selecting Mobile System | |
| US20100113018A1 (en) | Wireless Communication Terminal, Communication Control Method of Wireless Communication Terminal, and Wireless Communication System | |
| JP4200083B2 (en) | Background scan method | |
| US20080014928A1 (en) | Method of wireless network roaming and mobile phone using the same | |
| US20050185610A1 (en) | Method and system for controlling communication direction of mobile station | |
| US20100075671A1 (en) | Mobile apparatus | |
| JP2000312371A (en) | Radio communication terminal, base station and handover method | |
| WO2017038187A1 (en) | Wireless communication device and wireless communication method | |
| JP4807055B2 (en) | Communication channel selection method, communication channel selection control system, and program | |
| KR100313918B1 (en) | Method for processing Hand-off Parameter between Neighbor Base-station | |
| JP4573031B2 (en) | Handover control method / program / program recording medium, wireless communication terminal station / base station / system | |
| JP2008131510A (en) | Radio communication terminal and scanning operation control method | |
| JP2001078257A (en) | System for reducing waiting transition time |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20030812 |