JP2011009991A - Wireless communication apparatus - Google Patents

Wireless communication apparatus Download PDF

Info

Publication number
JP2011009991A
JP2011009991A JP2009150762A JP2009150762A JP2011009991A JP 2011009991 A JP2011009991 A JP 2011009991A JP 2009150762 A JP2009150762 A JP 2009150762A JP 2009150762 A JP2009150762 A JP 2009150762A JP 2011009991 A JP2011009991 A JP 2011009991A
Authority
JP
Japan
Prior art keywords
base station
received power
search
value
cell
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
Application number
JP2009150762A
Other languages
Japanese (ja)
Inventor
Kenichi Tsuji
健一 辻
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Kokusai Electric Inc
Original Assignee
Hitachi Kokusai Electric Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Kokusai Electric Inc filed Critical Hitachi Kokusai Electric Inc
Priority to JP2009150762A priority Critical patent/JP2011009991A/en
Publication of JP2011009991A publication Critical patent/JP2011009991A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a wireless communication apparatus capable of securing more stable radio communication than ever, and suppressing a cell search time in a cell search including an initial cell search requiring the longest search time.SOLUTION: In a communication function unit 120, a search frequency is determined according to a sequence preset in a frequency list, so as to search a base station by the search frequency. If the receiving power of a common pilot channel corresponding to a detected scramble code exceeds a threshold, the search of the base station is completed at that time, and a base station corresponding to the receiving power exceeding the threshold is determined to be a base station to be connected. When the base station search by the entire frequencies described in the frequency list is carried out, if the entire receiving power is lower than, inclusive of, the threshold, the wireless communication apparatus determines a base station having a preserved tentative effective cell to be the base station to be connected.

Description

本発明は、Ｗ−ＣＤＭＡ（Ｗｉｄｅｂａｎｄ−Ｃｏｄｅ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅ Ａｃｃｅｓｓ：広帯域符号分割多重接続方式）などを利用したセルラー通信を用いて基地局と通信する無線通信装置に関するものである。   The present invention relates to a wireless communication apparatus that communicates with a base station using cellular communication using W-CDMA (Wideband-Code Division Multiple Access).

Ｗ−ＣＤＭＡ方式においては、基地局との間で無線リンクを確立するため、無線通信装置が下りリンクの拡散符号同期を確立する必要がある。この下りリンクの拡散符号同期を確立する処理は、セルサーチと呼ばれ、下りリンクにおける基準信号である共通パイロットチャネル（ＣＰＩＣＨ：Common Pilot Channel）のスクランブルコードを検出する。セルサーチは、例えば、無線通信装置の電源立ち上げ時点において無線リンクを接続すべき基地局を探す初期セルサーチ、ハンドオーバ先の基地局を探す通信中のセルサーチ、通信待受時に無線リンクを接続する基地局を探す待受時のセルサーチに分類することができる。Ｗ−ＣＤＭＡ方式では、高速なセルサーチを実現するために、スロットタイミングの検出（ＳＴＥＰ１）、フレームタイミングの検出及びスクランブルコードグループの特定（ＳＴＥＰ２）、スクランブルコードの特定（ＳＴＥＰ３）という３段階セルサーチが採用されている。   In the W-CDMA system, since a radio link is established with a base station, it is necessary for the radio communication apparatus to establish downlink spread code synchronization. This process of establishing downlink spread code synchronization is called cell search and detects a scramble code of a common pilot channel (CPICH) that is a reference signal in the downlink. Cell search includes, for example, an initial cell search that searches for a base station to which a radio link is to be connected at the time of power-on of the radio communication device, a cell search during communication that searches for a handover destination base station, and a radio link that is connected when waiting for communication Cell search at the time of standby for searching for a base station to perform. In the W-CDMA system, in order to realize a high-speed cell search, three-stage cell search including slot timing detection (STEP 1), frame timing detection and scramble code group specification (STEP 2), and scramble code specification (STEP 3). Is adopted.

最もサーチ時間を要する初期セルサーチにおいては、周波数単位で、通信可能である基地局が存在するか否かのサーチを行うが、その際、優先周波数と呼ばれる、過去に接続した実績のある周波数のみをサーチする場合もあり、サーチの結果、通信に適する基地局が見つかると、その周波数にて報知情報の受信を行い、その後、位置登録処理を行う。この初期セルサーチでは、基地局が存在していた周波数から優先的にサーチを行い、通信に適する基地局が見つかり次第位置登録を行うことにより、セルサーチをすばやく行うことが可能である。   In the initial cell search that requires the longest search time, a search is performed on a frequency basis to determine whether there is a communicable base station. At that time, only a frequency that has been connected in the past, called a priority frequency, is used. If a base station suitable for communication is found as a result of the search, broadcast information is received at that frequency, and then location registration processing is performed. In this initial cell search, a cell search can be quickly performed by performing a search preferentially from the frequency at which the base station existed and performing a location registration as soon as a base station suitable for communication is found.

従来のセルサーチの典型例として、特許文献１に記載された従来のセルサーチが挙げられる。特許文献１に記載された従来のセルサーチにおいては、スロットタイミングの検出（ＳＴＥＰ１）、フレームタイミングの検出とスクランブルコードグループの特定（ＳＴＥＰ２）の後、共通パイロットチャネルを用いたスクランブルコード番号の同定を行い、その後、誤同期を低減するため、共通パイロットチャネルを用いたしきい値（固定値）による確認を行っている（特開２００２−１１８４９６号公報の図１０参照）。   A typical example of the conventional cell search is the conventional cell search described in Patent Document 1. In the conventional cell search described in Patent Document 1, after detecting slot timing (STEP 1), detecting frame timing and specifying a scramble code group (STEP 2), identifying a scramble code number using a common pilot channel After that, in order to reduce false synchronization, confirmation by a threshold value (fixed value) using a common pilot channel is performed (see FIG. 10 of Japanese Patent Laid-Open No. 2002-118496).

特開２００２−１１８４９６号公報Japanese Patent Application Laid-Open No. 2002-118496

しかしながら、特許文献１に記載された従来のセルサーチにおいては、しきい値による確認の失敗率が大きくなると、再サーチを行う必要があるため、セルサーチ時間がどうしても長くなるという課題があり、電力加算部の出力とのレベルの比較に用いるしきい値が固定値であるため、位相変動による電力加算部の出力の変動に対応しきれず、誤検出が生じ、基地局と接続不能になるという課題があった。   However, in the conventional cell search described in Patent Document 1, if the failure failure rate due to the threshold value increases, it is necessary to perform a re-search. Since the threshold used for level comparison with the output of the adder is a fixed value, it cannot cope with fluctuations in the output of the power adder due to phase fluctuations, resulting in false detection and inability to connect to the base station was there.

また、従来のセルサーチでは、最初にサーチを実施した周波数において、電界強度が弱くても、通信可能な基地局が見つかれば、他の周波数に電界強度のより強い基地局があるにもかかわらず、受信状況の悪い基地局と通信を行うことになるため、受信率の低下や再度の周波数変更処理が入る等の弊害が生じる。   In addition, in the conventional cell search, even if the field strength is low at the frequency at which the search was first performed, if a communicable base station is found, there is a base station with a higher field strength at another frequency. Since communication is performed with a base station having a poor reception status, adverse effects such as a decrease in reception rate and re-frequency change processing occur.

本発明の目的は、従来よりも、安定した無線通信を確保し、かつ、最もサーチ時間を要する初期セルサーチを含むセルサーチにおいて、セルサーチ時間を抑制することができる無線通信装置を提供することにある。   An object of the present invention is to provide a radio communication apparatus capable of ensuring stable radio communication and suppressing the cell search time in a cell search including an initial cell search that requires the longest search time compared to the prior art. It is in.

本発明は、基地局と無線通信する無線通信装置であって、
予め設定した周波数リストに従ってサーチ周波数を定め、サーチ周波数における基地局のサーチを行う基地局検出手段と、
前記基地局検出手段によって検出した基地局からの受信信号の受信電力と予め設定されたしきい値とを比較する比較手段と、
前記比較手段によって比較した結果、前記受信電力が前記しきい値を超えている場合には、その時点で、基地局のサーチを終了して、しきい値を超えた受信電力に対応する基地局を接続すべき基地局として決定する第一の決定手段と、
前記比較手段によって比較した結果、前記受信電力が前記しきい値以下の場合には、接続すべき基地局の候補としての仮有効セルとして、前記受信電力の値と当該受信電力に対応するサーチ周波数の情報とを関連付けて記憶素子に保存する保存手段と、
前記周波数リストの全ての周波数における基地局のサーチを行った場合において、全ての受信電力が前記しきい値以下であったときに、前記記憶素子に保存された仮有効セルの基地局を接続すべき基地局として決定する第二の手段とを備え、
前記保存手段は、前記記憶素子に前記受信電力の値及び前記サーチ周波数の情報を保存する際、前記記憶素子に既に仮有効セルが保存されている場合には当該仮有効セルの受信電力の値と保存対象の前記受信電力の値とを比較し、保存対象の前記受信電力の値が前記有効セルの受信電力の値よりも大きければ、当該仮有効セルの受信電力の値及びサーチ周波数の情報を保存対象の前記受信電力の値及び前記サーチ周波数の情報に置き換え、保存対象の前記受信電力の値が前記有効セルの受信電力の値以下であれば、保存対象の前記受信電力の値及び前記サーチ周波数の情報の保存を抑制することを特徴とする無線通信装置を開示する。 The present invention is a wireless communication device that wirelessly communicates with a base station,
A base station detecting means for determining a search frequency according to a preset frequency list and searching for a base station at the search frequency;
Comparison means for comparing the received power of the received signal from the base station detected by the base station detection means and a preset threshold value;
If the received power exceeds the threshold value as a result of the comparison by the comparing means, the base station search is terminated at that time, and the base station corresponding to the received power exceeding the threshold value First determining means for determining as a base station to be connected;
As a result of the comparison by the comparison means, if the received power is equal to or lower than the threshold value, the value of the received power and the search frequency corresponding to the received power as a temporary effective cell as a candidate for a base station to be connected Storage means for associating and storing the information in the storage element;
When searching for base stations at all frequencies in the frequency list and all received power is below the threshold, the base station of the temporary effective cell stored in the storage element is connected. And a second means for determining as a base station to be
When the storage means stores the received power value and the search frequency information in the storage element, if the temporary effective cell is already stored in the storage element, the received power value of the temporary effective cell. And the value of the received power to be stored, and if the value of the received power to be stored is larger than the value of the received power of the valid cell, the received power value and search frequency information of the temporary valid cell Is replaced with the received power value and the search frequency information to be stored, and if the received power value to be stored is equal to or lower than the received power value of the valid cell, the received power value to be stored and the Disclosed is a wireless communication apparatus characterized by suppressing storage of search frequency information.

本発明の無線通信装置は、従来よりも、安定した無線通信を実現することが可能であり、セルサーチ時間の増大が効果的に抑制され、セルサーチ時間と安定通信の両立が図られる。   The wireless communication apparatus of the present invention can realize more stable wireless communication than before, and an increase in cell search time is effectively suppressed, so that both cell search time and stable communication can be achieved.

本発明の無線通信装置は、しきい値を設置条件に応じた最適値に適宜変更することが可能であるため、容易に通信品質の改善を図ることもできる。   Since the wireless communication apparatus of the present invention can appropriately change the threshold value to the optimum value according to the installation conditions, the communication quality can be easily improved.

本発明の無線通信装置は、仮有効セルを置き換えていくため、省電力である。   The wireless communication apparatus of the present invention saves power because the temporary effective cell is replaced.

本発明の無線通信装置の一実施形態の概要を示すブロック図である。It is a block diagram which shows the outline | summary of one Embodiment of the radio | wireless communication apparatus of this invention. 本発明の無線通信装置をデータ端末装置に接続した形態の概要の一例を示すブロック図である。It is a block diagram which shows an example of the outline | summary of the form which connected the radio | wireless communication apparatus of this invention to the data terminal device. 本発明の無線通信装置における初期セルサーチのセルサーチから待ち受け状態に至るまでの手順の一例を示すフローシートである。It is a flowchart which shows an example of the procedure from the cell search of an initial cell search to a standby state in the radio | wireless communication apparatus of this invention. 本発明の無線通信装置における初期セルサーチのセルサーチから待ち受け状態に至るまでの手順の他の一例を示すフローシートである。It is a flowchart which shows another example of the procedure from the cell search of an initial cell search to a standby state in the radio | wireless communication apparatus of this invention.

以下、図面を参照して本発明の実施の形態について説明する。   Embodiments of the present invention will be described below with reference to the drawings.

本発明の無線通信装置は、例えばＷ−ＣＤＭＡ（Ｗｉｄｅｂａｎｄ−Ｃｏｄｅ ＤｉｖｉｓｉｏｎＭｕｌｔｉｐｌｅ Ａｃｃｅｓｓ：広帯域符号分割多重接続方式）を利用したセルラー通信を用いて基地局と通信する。本発明の無線通信装置は、例えば、図１に示すように、アンテナ部１１０、通信機能部１２０、表示部１３０、操作部１４０を備えた、移動を前提とする移動通信端末１００であってもよく、図２に示すように、自動販売機などのデータ端末装置（ＤＴＥ：Ｄａｔａ Ｔｅｒｍｉｎａｌ Ｅｑｕｉｐｍｅｎｔ）２００に接続され、アンテナ部１１０、通信機能部１２０、表示部１３０、操作部１４０、データ端末装置２００の処理部２１０と接続されデータ端末装置２００との間のデータ通信を制御する通信制御部１５０を備えた、移動を前提としない無線通信端末１０１であってもよい。   The wireless communication apparatus of the present invention communicates with a base station using cellular communication using, for example, W-CDMA (Wideband-Code Division Multiple Access). For example, as shown in FIG. 1, the wireless communication device of the present invention may be a mobile communication terminal 100 that is equipped with an antenna unit 110, a communication function unit 120, a display unit 130, and an operation unit 140 on the premise of movement. As shown in FIG. 2, it is connected to a data terminal equipment (DTE) 200 such as a vending machine, and has an antenna unit 110, a communication function unit 120, a display unit 130, an operation unit 140, and a data terminal device 200. The wireless communication terminal 101 that is connected to the processing unit 210 and includes the communication control unit 150 that controls data communication with the data terminal device 200 and is not premised on movement may be used.

本発明の無線通信装置において、初期セルサーチにおけるセルサーチから待ち受け状態に至るまでの手順の一例を、図３及び図４に従い説明する。   An example of the procedure from the cell search in the initial cell search to the standby state in the wireless communication apparatus of the present invention will be described with reference to FIGS.

初期セルサーチは、例えば、操作部１４０の電源キーを押して、電源ＯＮの状態にした場合や電源リセット時において、通信機能部１２０で行われる。通信機能部１２０は、まず、記憶素子から初期セルサーチを行う周波数リストを取得する（Ｓ１０１，Ｓ２０１）。周波数リストは、サーチ周波数を予め設定したものであれば特に限定されず、サーチ順位が予め設定されていてもよいし、過去に接続した周波数と接続した頻度順にサーチする順位を定めた優先周波数リストであってもよい（Ｓ２０１）。記憶素子は周波数リストを記憶できるものであればよく、例えば、揮発性メモリであっても、不揮発性メモリであってもよい。次に、ｉ＝０（初期値）とした（Ｓ１０２，Ｓ２０２）後、周波数リストの最初にある周波数における基地局のサーチを行い（Ｓ１０４，Ｓ２０４）、通信機能部１２０の検出手段で、共通パイロットチャネルのスクランブルコードを検出する（Ｓ１０５，Ｓ２０５）。   The initial cell search is performed by the communication function unit 120, for example, when the power key of the operation unit 140 is pressed to turn on the power or when the power is reset. First, the communication function unit 120 acquires a frequency list for performing an initial cell search from the storage element (S101, S201). The frequency list is not particularly limited as long as the search frequency is set in advance, the search order may be set in advance, or the priority frequency list that defines the order of search in the order of the frequency connected to the frequency connected in the past. (S201). The storage element only needs to be able to store the frequency list, and may be, for example, a volatile memory or a nonvolatile memory. Next, after setting i = 0 (initial value) (S102, S202), a search for a base station at the first frequency in the frequency list is performed (S104, S204). A channel scramble code is detected (S105, S205).

検知手段において、共通パイロットチャネルのスクランブルコードが検出できなかった場合（Ｓ１０５／Ｎｏ，Ｓ２０５／Ｎｏ）には、ｉ＝ｉ＋１とし（Ｓ１０８，Ｓ２０８）、周波数リストに並べられた順番で、順次異なるサーチ周波数における基地局のサーチを行い（Ｓ１０４，Ｓ２０４）、通信機能部１２０の検出手段で、基地局、即ち基地局からの信号を検出する。例えば、共通パイロットチャネルのスクランブルコードを検出する（Ｓ１０５，Ｓ２０５）。   When the detection means cannot detect the scramble code of the common pilot channel (S105 / No, S205 / No), i = i + 1 (S108, S208), and the search sequentially different in the order arranged in the frequency list. The base station is searched for the frequency (S104, S204), and the signal from the base station, that is, the base station is detected by the detecting means of the communication function unit 120. For example, the scramble code of the common pilot channel is detected (S105, S205).

検知手段において、共通パイロットチャネルのスクランブルコードが検出できた場合（Ｓ１０５／Ｙｅｓ，Ｓ２０５／Ｙｅｓ）には、通信機能部１２０の比較手段で、検出したスクランブルコードに対応する共通パイロットチャネルの受信電力（受信信号の受信電界強度）と適宜変更可能であるしきい値とを比較する（Ｓ１０６，Ｓ２０６）。   When the detection means can detect the scramble code of the common pilot channel (S105 / Yes, S205 / Yes), the reception power of the common pilot channel corresponding to the scramble code detected by the comparison means of the communication function unit 120 ( The received electric field intensity of the received signal is compared with a threshold value that can be changed as appropriate (S106, S206).

なお、しきい値は、プログラム上で定義してもよく、不揮発性メモリ（ＮＶＭ：non volatile memory）に保存してもよい。しきい値を不揮発性メモリに保存することは、状況に応じてしきい値が適宜変更可能となるため、好ましい。また、本発明の無線通信装置がバスロケーションシステムや自動販売機の在庫管理などのマシンｔｏマシン通信などに用いられる場合には、しきい値を調整することにより、設置条件（場所、移動空間など）に応じた最適なセルサーチが行えるため、容易に更なる通信品質の改善を図ることも可能となる。   The threshold value may be defined on a program, or may be stored in a non-volatile memory (NVM). It is preferable to store the threshold value in the nonvolatile memory because the threshold value can be appropriately changed according to the situation. When the wireless communication apparatus of the present invention is used for machine-to-machine communication such as a bus location system or vending machine inventory management, the installation condition (location, movement space, etc.) is adjusted by adjusting the threshold value. Therefore, it is possible to easily improve the communication quality easily.

比較手段による比較の結果、共通パイロットチャネルの受信電力がしきい値を超えている場合（Ｓ１０６／Ｙｅｓ，Ｓ２０６／Ｙｅｓ）には、その時点で、基地局のサーチを終了し、通信機能部１２０の決定手段で、しきい値を超えた受信電力に対応する基地局を接続すべき基地局として決定する（Ｓ１１１，Ｓ２１１）。   If the received power of the common pilot channel exceeds the threshold value as a result of the comparison by the comparison means (S106 / Yes, S206 / Yes), the base station search is terminated at that time, and the communication function unit 120 The base station corresponding to the received power exceeding the threshold is determined as a base station to be connected (S111, S211).

比較手段による比較の結果、共通パイロットチャネルの受信電力がしきい値以下となった場合（Ｓ１０６／Ｎｏ，Ｓ２０６／Ｎｏ）には、通信機能部１２０の保存手段で、通信機能部１２０の記憶素子に記録された、接続すべき基地局の候補としての仮有効セルの受信電力値があれば、その受信電力値を読み出した後、読み出した仮有効セルの受信電力値と共通パイロットチャネルの受信電力を比較し、共通パイロットチャネルの受信電力が仮有効セルの受信電力値を超えているときは、当該受信電力に対応する基地局が有効な電界強度が得られる基地局の候補であるとして、仮有効セルの基地局を当該受信電力に対応する基地局に置き換えると共に、仮有効セルの受信電力値を当該受信電力に置き換え、仮有効セルの基地局と仮有効セルの受信電力値とサーチ周波数を関連付けて保存する（Ｓ１０７，Ｓ２０７）。また、共通パイロットチャネルの受信電力が仮有効セルの受信電力値以下であれば、保存手段は保存対象の共通パイロットチャネルの受信電力やサーチ周波数の記憶素子への保存は行わない。なお、保存手段は、共通パイロットチャネルの受信電力及びサーチ周波数を登録する際に、記憶素子に仮有効セルとしての受信電力値やサーチ周波数が未だに一つも登録されていなければ、当該共通パイロットチャネルの受信電力及びサーチ周波数を保存する。ここで、保存手段が仮有効セルの情報として記憶素子に登録する内容は本発明において上述した内容に限定されるものではなく、保存手段は少なくとも受信電力値と基地局又はサーチ周波数が特定できる情報（サーチ周波数の情報）とを保存すればよい。その後、ｉ＝ｉ＋１とした（Ｓ１０８，Ｓ２０８）後、周波数リストの順番に従い、順次異なる周波数において基地局のサーチが行われ（Ｓ１０４，Ｓ２０４）、通信機能部１２０の検知手段で、共通パイロットチャネルのスクランブルコードを検出する（Ｓ１０５，Ｓ２０５）。   As a result of the comparison by the comparison means, when the received power of the common pilot channel is equal to or less than the threshold value (S106 / No, S206 / No), the storage means of the communication function unit 120 stores the storage element of the communication function unit 120. If there is a received power value of a temporary effective cell as a candidate of a base station to be connected, which is recorded in, after reading the received power value, the received received power value of the temporary effective cell and the received power of the common pilot channel If the received power of the common pilot channel exceeds the received power value of the temporary effective cell, it is determined that the base station corresponding to the received power is a candidate for a base station that can obtain an effective electric field strength. While replacing the base station of the effective cell with the base station corresponding to the received power, the received power value of the temporary effective cell is replaced with the received power, and the base station of the temporary effective cell and the temporary effective cell Save in association with transmission power value and the search frequency (S107, S207). If the received power of the common pilot channel is equal to or less than the received power value of the temporary effective cell, the storage means does not store the received power of the common pilot channel to be stored or the search frequency in the storage element. Note that the storage means, when registering the reception power and search frequency of the common pilot channel, if no reception power value or search frequency as a temporary effective cell has been registered yet in the storage element, Stores received power and search frequency. Here, the contents registered in the storage element by the storage means as the temporary effective cell information are not limited to the contents described above in the present invention, and the storage means can specify at least the received power value and the base station or search frequency. (Search frequency information) may be stored. Thereafter, after setting i = i + 1 (S108, S208), the base station search is sequentially performed at different frequencies according to the order of the frequency list (S104, S204), and the detection unit of the communication function unit 120 detects the common pilot channel. A scramble code is detected (S105, S205).

周波数リストに記載された全周波数について基地局のサーチを行った場合（Ｓ１０３／Ｎｏ，Ｓ１０３／Ｎｏ）には、第二の決定手段で、保存手段に保存された仮有効セルの有無を確認し（Ｓ１０９，Ｓ２０９）、仮有効セルがある場合（Ｓ１０９／Ｙｅｓ，Ｓ２０９／Ｙｅｓ）には、保存手段に保存された仮有効セルの基地局を接続すべき基地局として決定する（Ｓ１１１，Ｓ２１１）。これにより、セルサーチ時間の短縮と安定した電界強度での無線通信の両方が実現する。   When the base station is searched for all the frequencies listed in the frequency list (S103 / No, S103 / No), the second determining means checks whether there is a temporary valid cell stored in the storing means. (S109, S209) When there is a temporary effective cell (S109 / Yes, S209 / Yes), the base station of the temporary effective cell stored in the storage means is determined as the base station to be connected (S111, S211). . As a result, both shortening of the cell search time and wireless communication with a stable electric field strength are realized.

接続すべき基地局が決定した（Ｓ１１１，Ｓ２１１）後には、決定した接続すべき基地局に対して、情報受信手段により報知情報の受信処理を行う（Ｓ１１２，Ｓ２１２）。報知情報としては、例えば、基地局固有情報、基地局からの制御情報、移動局が在圏する一般公衆向け基地局の周辺セルに関する情報などが挙げられる。報知情報の受信処理が終了した後は、保存手段に保存されたサーチ周波数で位置登録処理が行われ（Ｓ１１３，Ｓ２１３）、その後、待ち受け状態になり、表示部１３０に圏内と表示される（Ｓ１１４，Ｓ２１４）。   After the base station to be connected is determined (S111, S211), the information receiving means performs broadcast information reception processing on the determined base station to be connected (S112, S212). The broadcast information includes, for example, base station specific information, control information from the base station, information on neighboring cells of the general public base station where the mobile station is located, and the like. After the broadcast information reception process is completed, the position registration process is performed at the search frequency stored in the storage unit (S113, S213), and then the standby state is displayed, and the display unit 130 displays the range (S114). , S214).

第二の決定手段で、保存手段に保存された仮有効セルの有無を確認した（Ｓ１０９）結果、仮有効セルがない場合（Ｓ１０９／Ｎｏ）には、表示部１３０に圏外と表示される（Ｓ１１０）。なお、セルサーチ時間の短縮よりも安定した無線通信の実現を重視するときは、図４に示すように、保存手段に保存された仮有効セルの有無を確認した（Ｓ２０９）結果、仮有効セルがない場合（Ｓ２０９／Ｎｏ）には、優先周波数リスト以外の周波数についてセルサーチを行ったり、全ての周波数についてセルサーチを行ってもよい（Ｓ２１０）。   When the second determination means confirms whether or not there is a temporary valid cell stored in the storage means (S109), if there is no temporary valid cell (S109 / No), it is displayed on the display unit 130 as out of range ( S110). When emphasizing the realization of stable wireless communication rather than shortening of the cell search time, as shown in FIG. 4, the presence or absence of a temporary effective cell stored in the storage means is confirmed (S209). If there is no (S209 / No), a cell search may be performed for frequencies other than the priority frequency list, or a cell search may be performed for all frequencies (S210).

本発明の無線通信装置をデータ端末装置に接続した場合における情報処理手順の具体例を以下に示す。本発明のデータ端末装置２００が自動販売機である場合には、無線通信端末１０１がアンテナ１１０を介してデータ端末装置２００の在庫情報の送信要求を受信すると、無線通信端末１０１の通信制御部１５０は、在庫情報の送信要求をデータ端末装置２００の処理部２１０に送信する。データ端末装置２００の処理部２１０は、データ端末装置２００内の情報を管理し、無線通信端末１０１から受信した在庫情報の送信要求に応じた処理を行う。その後、データ端末装置２００の処理部２１０から送信要求に係る在庫情報を受信した通信制御部１５０は、通信機能部１２０により、在庫情報の送信要求の要求元へデータ端末装置２００から受信した送信要求に係る在庫情報を送信する。   A specific example of an information processing procedure when the wireless communication device of the present invention is connected to a data terminal device is shown below. When the data terminal device 200 of the present invention is a vending machine, when the wireless communication terminal 101 receives a transmission request for inventory information of the data terminal device 200 via the antenna 110, the communication control unit 150 of the wireless communication terminal 101 is used. Transmits a request for transmitting inventory information to the processing unit 210 of the data terminal device 200. The processing unit 210 of the data terminal device 200 manages information in the data terminal device 200 and performs processing in response to a transmission request for inventory information received from the wireless communication terminal 101. After that, the communication control unit 150 that has received the inventory information related to the transmission request from the processing unit 210 of the data terminal device 200 transmits the transmission request received from the data terminal device 200 to the request source of the inventory information transmission request by the communication function unit 120. The inventory information concerning is transmitted.

１００ 移動通信端末
１０１ 無線通信端末
１１０ アンテナ部
１２０ 通信機能部
１３０ 表示部
１４０ 操作部
１５０ 通信制御部
２００ データ端末装置
２１０ 処理部 DESCRIPTION OF SYMBOLS 100 Mobile communication terminal 101 Wireless communication terminal 110 Antenna part 120 Communication function part 130 Display part 140 Operation part 150 Communication control part 200 Data terminal device 210 Processing part

Claims (1)

基地局と無線通信する無線通信装置であって、
予め設定した周波数リストに従ってサーチ周波数を定め、サーチ周波数における基地局のサーチを行う基地局検出手段と、
前記基地局検出手段によって検出した基地局からの受信信号の受信電力と予め設定されたしきい値とを比較する比較手段と、
前記比較手段によって比較した結果、前記受信電力が前記しきい値を超えている場合には、その時点で、基地局のサーチを終了して、しきい値を超えた受信電力に対応する基地局を接続すべき基地局として決定する第一の決定手段と、
前記比較手段によって比較した結果、前記受信電力が前記しきい値以下の場合には、接続すべき基地局の候補としての仮有効セルとして、前記受信電力の値と当該受信電力に対応するサーチ周波数の情報とを関連付けて記憶素子に保存する保存手段と、
前記周波数リストの全ての周波数における基地局のサーチを行った場合において、全ての受信電力が前記しきい値以下であったときに、前記記憶素子に保存された仮有効セルの基地局を接続すべき基地局として決定する第二の手段とを備え、
前記保存手段は、前記記憶素子に前記受信電力の値及び前記サーチ周波数の情報を保存する際、前記記憶素子に既に仮有効セルが保存されている場合には当該仮有効セルの受信電力の値と保存対象の前記受信電力の値とを比較し、保存対象の前記受信電力の値が前記有効セルの受信電力の値よりも大きければ、当該仮有効セルの受信電力の値及びサーチ周波数の情報を保存対象の前記受信電力の値及び前記サーチ周波数の情報に置き換え、保存対象の前記受信電力の値が前記有効セルの受信電力の値以下であれば、保存対象の前記受信電力の値及び前記サーチ周波数の情報の保存を抑制することを特徴とする無線通信装置。 A wireless communication device that wirelessly communicates with a base station,
A base station detecting means for determining a search frequency according to a preset frequency list and searching for a base station at the search frequency;
Comparison means for comparing the received power of the received signal from the base station detected by the base station detection means and a preset threshold value;
If the received power exceeds the threshold value as a result of the comparison by the comparing means, the base station search is terminated at that time, and the base station corresponding to the received power exceeding the threshold value First determining means for determining as a base station to be connected;
As a result of the comparison by the comparison means, if the received power is equal to or lower than the threshold value, the value of the received power and the search frequency corresponding to the received power as a temporary effective cell as a candidate for a base station to be connected Storage means for associating and storing the information in the storage element;
When searching for base stations at all frequencies in the frequency list and all received power is below the threshold, the base station of the temporary effective cell stored in the storage element is connected. And a second means for determining as a base station to be
When the storage means stores the received power value and the search frequency information in the storage element, if the temporary effective cell is already stored in the storage element, the received power value of the temporary effective cell. And the value of the received power to be stored, and if the value of the received power to be stored is larger than the value of the received power of the valid cell, the received power value and search frequency information of the temporary valid cell Is replaced with the received power value and the search frequency information to be stored, and if the received power value to be stored is equal to or lower than the received power value of the valid cell, the received power value to be stored and the A wireless communication apparatus that suppresses storage of search frequency information.
JP2009150762A 2009-06-25 2009-06-25 Wireless communication apparatus Pending JP2011009991A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009150762A JP2011009991A (en) 2009-06-25 2009-06-25 Wireless communication apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009150762A JP2011009991A (en) 2009-06-25 2009-06-25 Wireless communication apparatus

Publications (1)

Publication Number Publication Date
JP2011009991A true JP2011009991A (en) 2011-01-13

Family

ID=43566146

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009150762A Pending JP2011009991A (en) 2009-06-25 2009-06-25 Wireless communication apparatus

Country Status (1)

Country Link
JP (1) JP2011009991A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017130944A (en) * 2011-07-18 2017-07-27 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ Enabling half-duplex operation
US9967075B2 (en) 2013-03-25 2018-05-08 Fujitsu Limited Radio communication system, base station, radio communication apparatus, and radio communication method
CN114172612A (en) * 2021-10-11 2022-03-11 哲库科技(北京)有限公司 Cell search method, cell search device, electronic equipment and computer-readable storage medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017130944A (en) * 2011-07-18 2017-07-27 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ Enabling half-duplex operation
US10298378B2 (en) 2011-07-18 2019-05-21 Qualcomm Incorporated Enabling half-duplex operation
US9967075B2 (en) 2013-03-25 2018-05-08 Fujitsu Limited Radio communication system, base station, radio communication apparatus, and radio communication method
CN114172612A (en) * 2021-10-11 2022-03-11 哲库科技(北京)有限公司 Cell search method, cell search device, electronic equipment and computer-readable storage medium

Similar Documents

Publication Publication Date Title
US9615297B2 (en) Method for identifying user equipment to a femtocell
KR101124482B1 (en) Apparatus and method for operating dual mode of mobile communication terminal
TWI382730B (en) Improving intersystem cell reselection from geran to utran
CN105282796B (en) Network mode switching method, device and terminal
KR100933105B1 (en) Wireless communication apparatus, wireless communication method, and recording medium
US20060068782A1 (en) Cell search method and mobile communication terminal
US10045282B2 (en) System and method for optimizing scanning from a multi-band communications device
JP2002199428A (en) Mobile communication terminal and its handover control method and control program
US20130059579A1 (en) Mobile terminal and mobile communication method
JP4706919B2 (en) Mobile communication terminal and cell switching control method
KR20120070707A (en) Apparatus and method for reducing power consumption in portable terminal
JP2011009991A (en) Wireless communication apparatus
CN107734496B (en) Network searching control method and device of mobile terminal and mobile terminal
JP2003061158A (en) Cellular phone and cell search method used for the phone
CN101193387B (en) Apparatus and method for current saving in mobile communication terminal
CN102804642A (en) Increasing time interval between successive searches for signaling of neighboring cells of a different wireless technology
US10070356B2 (en) Communication device, communication system, communication control method, and communication control program
CN101741417A (en) Method and device for searching cells
KR20200009772A (en) Automatically Changing Method of Networks and Terminal device supporting the same
KR20110055029A (en) Apparatus and method for camping on in mobile communication terminal
CN110996354B (en) Cell reselection method with interference avoidance in mobile communication and device thereof
JP2011199447A (en) Radio communication system
US20240089843A1 (en) Cell selection method and apparatus, and storage medium
JP3457627B2 (en) Mobile communication method and mobile station
KR20100007452A (en) Apparatus and method for searching service band in mobile communication terminal