JP4082639B2

JP4082639B2 - Wireless line analyzer

Info

Publication number: JP4082639B2
Application number: JP07770799A
Authority: JP
Inventors: 新悟西谷
Original assignee: Advantest Corp
Current assignee: Advantest Corp
Priority date: 1999-03-23
Filing date: 1999-03-23
Publication date: 2008-04-30
Anticipated expiration: 2019-03-23
Also published as: JP2000278225A

Description

【０００１】
【発明の属する技術分野】
この発明は、無線通信の状態を解析する無線回線解析装置に関する。特に、通信電波の反射や回折による干渉や他信号との干渉等の復調困難な状況を的確に捕捉可能な無線回線解析装置に関する。
【０００２】
【従来の技術】
従来の無線回線解析装置の要部構成について図５を参照して説明する。
要部構成は、ＲＦ部１０と、復調部２０と、受信情報処理部３０と、ＡＤＣ部４０と、振幅検出部５０と、タイマー部６０と、第１記憶媒体部７０と、中央演算処理部８０とで成る。尚、通信電波としては、簡易型の携帯電話であるＰＨＳ（Personal Handyphone System）の時分割多重接続方式（ＴＤＭＡ）の電波の場合と仮定する。基地局は移動局に対して通信スロットを割り当て制御したり、発信、着信、通話中チャンネル切り替え、サービス識別等の制御をする。移動局は基地局の制御に基づいて割当てされた通信スロットを用いて送信・受信する。通信スロットはアイドル期間と送信出力期間とがあり移動局、基地局から所定タイムスロット区間毎にバースト的に送出される。
【０００３】
ＲＦ部１０は、通信電波をアンテナにより受け、目的の周波数チャンネルの周波数信号を受けて、所定の中間周波数信号（ＩＦ信号）１０ｓに周波数変換し、これを復調部２０とＡＤＣ部４０へ供給する。
【０００４】
復調部２０は、上記ＩＦ信号１０ｓを受けて、バースト的に生じる通信フレーム（受信フレーム）の同期をとって復調処理をし、得られた受信情報信号２０ｄと同期クロック２０ｃを受信情報処理部３０へ送出する。
【０００５】
受信情報処理部３０は、上記受信情報信号２０ｄと同期クロック２０ｃを受けて、復調可能な場合は通信プロトコルに基づき受信フレーム中の各種制御信号の生成を行い、レイヤ２やレイヤ３のプロトコル、通信シーケンス状況を生成して得られた受信情報３０ｓを第１記憶媒体部７０へ送出する。また、当該受信フレームのタイミング信号は時間検出信号３０ｔとしてタイマー部６０へ送出する。また、正常に復調したことを示す受信フレーム検出信号３０ｍを振幅検出部５０へ送出する。もしも干渉等の影響で、復調不良となった受信フレームの場合は、当然ながら受信フレーム検出信号３０ｍは出力されない。
【０００６】
タイマー部６０は、受信フレームのタイムスタンプ用信号を発生する。即ち、内蔵時計の時間情報を内部で発生させていて、受信情報処理部３０からの時間検出信号３０ｔを受けたときの時間情報６０ｓを保持し、その時間情報６０ｓを第１記憶媒体部７０へ送出する。
【０００７】
ＡＤＣ部４０は、上記ＲＦ部１０からの受信電界強度に相当するアナログのＩＦ信号１０ｓを受けて、ＡＤ変換した振幅情報４０ｓを振幅検出部５０へ送出する。
【０００８】
振幅検出部５０は、上記振幅情報４０ｓを受けて、受信情報処理部３０からの受信フレーム検出信号３０ｍを受けたとき、当該フレーム期間におけるピークレベル値及び平均値レベル値を求め、これを当該受信フレームの振幅情報５０ｓとして第１記憶媒体部７０へ送出する。
【０００９】
第１記憶媒体部７０は、上記受信フレーム単位の受信情報３０ｓと、その時の時間情報６０ｓと振幅情報５０ｓとを記憶媒体に順次格納していく。従って、もしも干渉等の影響で、受信フレーム検出信号３０ｍが得られない期間では、当該復調不良フレームの情報については格納されず欠落フレームとなってしまう。
【００１０】
中央演算処理部８０は、上記第１記憶媒体部７０の格納情報７０ｓを読み出し、所定期間に収得した複数の受信フレームの受信情報３０ｓと、その時の時間情報６０ｓと振幅情報５０ｓとから、当該期間に対する通信情報を加工処理して所望の表示形態で表示出力する。例えば、第１に受信情報３０ｓからは制御チャンネルＣch及び通信チャンネルＴchのレイヤ２／３の内容表示や、上り／下りの発着呼、割当て等の通信シーケンスの表示や、通信トラフィック状況の表示等であり、第２に振幅情報５０ｓからは各受信フレーム毎の電界強度のピークレベルや平均値レベルの表示等を行う。これらから通信状態のモニタや解析が行われる。
尚、上述受信情報処理部３０で処理すべき処理能力を当該中央演算処理部８０が例えばＤＳＰ（Digital Signal Processor）等を備えていれば、所望により、当該中央演算処理部８０で上述受信情報処理部３０の処理を実施する構成形態としてもよい。
【００１１】
次に、図６を参照して通信不能状態について説明する。
経時に伴い図に示す信号波及び妨害波（図６Ｂ参照）が発生するものと仮定する。
区間Ａでは正常な区間であり、受信フレームが復調され、当該受信情報３０ｓ、時間情報６０ｓ、振幅情報５０ｓが第１記憶媒体部７０に格納される。従って受信情報「有り」である。
一方、区間Ｂでは通信電波の反射や回折に伴う干渉やその他の妨害波による復調不能区間であり、受信フレームが復調エラーとなる結果、当該受信情報３０ｓ、時間情報６０ｓ、振幅情報５０ｓは第１記憶媒体部７０に格納されない。従って受信情報「無し」（図６Ｃ参照）となる。前記通信断烈時において、そのときの測定情報が得られない為、通信エラーの異常原因を解析するこができない。
【００１２】
【発明が解決しようとする課題】
上述説明したように従来技術においては、通信断烈等の異常原因が、無線回線特有の現象、即ち反射・回折により生じた多数のランダムな合成波によるフェージングあるいは他の信号との干渉、であるかの要因を特定するこができない。つまり、受信フレームが復調されないような状況における場合には、何ら測定情報が得られず原因解析ができないという難点がある。この点で従来技術の無線回線解析装置は好ましくなく実用上の難点がある。
そこで、本発明が解決しようとする課題は、受信電波の包絡線情報を取得する手段を備えて、受信フレームが復調されない状況においても的確な通信状態の解析が可能な無線回線解析装置を提供することである。
【００１３】
【課題を解決するための手段】
第１に、上記課題を解決するために、本発明の構成では、無線回線からの電波を受信して、通信プロトコルに対応した受信情報を生成して、無線回線の通信状態を解析する無線回線解析装置において、
少なくとも通信不能状態における受信電波の信号レベルの包絡線を測定する包絡線測定手段を備えることを特徴とする無線回線解析装置である。
上記発明によれば、受信電波の包絡線情報を取得する手段を備えて、受信フレームが復調されない状況においても的確な通信状態の解析が可能な無線回線解析装置が実現できる。
【００１４】
第２に、上記課題を解決するために、本発明の構成では、無線回線からの電波を受信して、通信プロトコルに対応した受信情報を生成して、無線回線の通信状態を解析する無線回線解析装置において、
少なくとも通信不能状態における受信電波の信号レベルの包絡線を測定する包絡線測定手段を複数チャンネル備えることを特徴とする無線回線解析装置がある。
【００１５】
第３に、上記課題を解決するために、本発明の構成では、無線回線からの電波を受信して、通信プロトコルに対応した受信情報を生成して、無線回線の通信状態を解析する無線回線解析装置において、
少なくとも通信不能状態における受信電波の信号レベルの包絡線を測定する包絡線測定手段を具備し、通信プロトコルに対応した送信情報を生成して移動局又は基地局の通信相手の機器との交信を行う送信手段を備えることを特徴とする無線回線解析装置がある。
【００１６】
包絡線測定手段としては、受信電波の信号から通信不能状態を検出し、当該通信不能の受信フレームを起点として所定時間以前から、以後の所定期間に対して、受信電波の信号レベルの包絡線をサンプリングし、量子化変換した包絡線データを記憶媒体（例えば第２記憶媒体部１４０）へ連続的に格納する包絡線データ格納手段を具備し、記憶媒体から連続した包絡線データを読み出して、通信不能状態における電波信号の信号レベルの包絡線を解析する包絡線解析手段を備えることを特徴とする上述無線回線解析装置がある。
【００１７】
包絡線測定手段としては、受信電波の信号から通信不能状態を検出し、当該通信不能の受信フレームを起点として所定時間以前から、以後の所定期間に対して、受信電波の信号レベルの包絡線をサンプリングし、量子化変換した包絡線データを記憶媒体へ連続的に格納する包絡線データ格納手段を具備し、記憶媒体（例えば第２記憶媒体部１４０）からの連続した包絡線データを読み出し、当該通信不能以前における正常に受信された受信情報３０ｓを他の記憶媒体（例えば第１記憶媒体部７０）から読み出して、通信不能状態における電波信号の信号レベルの包絡線を解析する包絡線解析手段を備えることを特徴とする上述無線回線解析装置がある。
【００１８】
包絡線データ格納手段としては、通信電波をアンテナにより受け、目的の周波数チャンネルの周波数信号を中間周波数信号（ＩＦ信号）１０ｓに周波数変換するＲＦ部１０からのＩＦ信号１０ｓを受けて、ＡＤＣ部４０でＩＦ信号１０ｓの包絡線の過渡的変化が取得可能に高速サンプリングして量子化変換し、量子化変換した振幅情報４０ｓを第２記憶媒体部１４０へ格納する構成手段を備えることを特徴とする上述無線回線解析装置がある。
【００１９】
包絡線データ格納手段としては、通信電波をアンテナにより受け、目的の周波数チャンネルの周波数信号を中間周波数信号（ＩＦ信号）１０ｓに周波数変換するＲＦ部１０からのＩＦ信号１０ｓを受けて、ＡＤＣ部４０でＩＦ信号１０ｓの包絡線の過渡的変化が取得可能に高速サンプリングして量子化変換し、量子化変換した振幅情報４０ｓを第２記憶媒体部１４０へ格納する構成手段を具備し、通信不能状態に至ったことを受信情報処理部３０が検出し、これを受けて、当該通信不能の受信フレームを起点として前後の所定期間の上記振幅情報４０ｓを第２記憶媒体部１４０へ格納制御する格納制御手段（例えば記憶媒体制御部１５０）とを備えることを特徴とする上述無線回線解析装置がある。
【００２０】
包絡線解析手段としては、上記記憶媒体からの連続した包絡線データを読み出して、通信不能状態における電波信号の信号レベルの包絡線と、通信正常状態における電波信号の信号レベルの包絡線との両者を相対比較して解析する包絡線解析手段であることを特徴とする上述無線回線解析装置がある。
【００２１】
送信手段としては、通信プロトコルに対応した擬似移動局に対応した送信情報を生成して移動局又は基地局の通信相手の機器との交信を行う送信手段であることを特徴とする上述無線回線解析装置がある。
【００２２】
送信手段としては、通信プロトコルに対応した擬似基地局に対応した送信情報を生成して移動局又は基地局の通信相手の機器との交信を行う送信手段であることを特徴とする上述無線回線解析装置がある。
【００２３】
【発明の実施の形態】
以下に本発明の実施の形態を実施例と共に図面を参照して詳細に説明する。
【００２４】
本発明について、図１の無線回線解析装置の要部構成図と、図２の通信不能状態と測定情報を示すタイムチャートと、図３の無線回線解析装置の他の要部構成図と、図４の無線回線解析装置の他の要部構成図、とを参照して以下に説明する。尚、従来構成に対応する要素は同一符号を付す。
【００２５】
先ず、本発明の無線回線解析装置の要部構成について図１を参照して説明する。
要部構成は、ＲＦ部１０と、復調部２０と、受信情報処理部３０と、ＡＤＣ部４０と、振幅検出部５０と、タイマー部６０と、第１記憶媒体部７０と、中央演算処理部８０と、第２記憶媒体部１４０と、基準クロック１１０と、第１分周器１２０と、第２分周器１３０とで成る。これは従来構成に対して、第２記憶媒体部１４０と基準クロック１１０と第１分周器１２０と第２分周器１３０とを追加した構成で成る。
【００２６】
基準クロック１１０は測定データ全体の同期関係を確保する為の基準のタイミングクロックであり、この基準タイミングクロック１１０ｃをタイマー部６０と第１分周器１２０へ供給する。
【００２７】
タイマー部６０は、基準クロック１１０に同期した受信フレームのタイムスタンプ用信号を発生する。即ち、上記基準タイミングクロック１１０ｃを基にして内蔵時計の精密な時間情報を内部で発生させていて、受信情報処理部３０からの時間検出信号３０ｔを受けたときの時間情報６０ｓを保持し、その時間情報６０ｓを第１記憶媒体部７０へ送出する。
【００２８】
ＡＤＣ部４０は、ＩＦ信号１０ｓの包絡線の過渡的変化がサンプリング可能な程度に高速サンプリングが可能なＡＤ変換器、例えば１０Ｍサンプリング／秒のＡＤ変換器を用いる。そして、上記基準タイミングクロック１１０ｃを第１分周器１２０により所望の１／Ｎに分周した第１分周クロック１２０ｃ（例えば１０ＭＨｚ）で連続的にＩＦ信号１０ｓを高速にサンプリングし、得られた連続するコードデータである振幅情報４０ｓを振幅検出部５０と第２記憶媒体部１４０へ送出する。
【００２９】
振幅検出部５０は、従来と同様であり、上記振幅情報４０ｓを受けて、受信情報処理部３０からの受信フレーム検出信号３０ｍを受けたとき、当該フレーム期間におけるピークレベル値及び平均値レベル値を求め、これを当該受信フレームの振幅情報５０ｓとして第１記憶媒体部７０へ送出する。
【００３０】
第２記憶媒体部１４０は、記憶容量の大きな記憶媒体を用いる。そして、第１分周クロック１２０ｃを第２分周器１３０により所望の１／Ｍに分周した分周クロック１３０ｃで、上記連続する高速の振幅情報４０ｓをそのまま、若しくは包絡線情報に圧縮変換して格納する。尚、分周値Ｍは記憶媒体の容量が十分大きく高速格納可能であればＭ＝１として、サンプリングした全ての振幅情報４０ｓを格納しても良い。これにより、ＩＦ信号１０ｓの経時レベル、即ち受信フレーム毎のレベルの包絡線や包絡線の過渡的変動を検出可能となる。また、第１記憶媒体部７０と第２記憶媒体部１４０の格納情報間の情報の対応は、時間情報６０ｓと振幅情報４０ｓのサンプリング数から相互のデータの位置関係の対応ずけ、ができる。
尚、第１記憶媒体部７０と第２記憶媒体部１４０とは、同一のものとしてもよい。
【００３１】
中央演算処理部８０へは次の処理手段を追加する。即ち、第１記憶媒体部７０の格納情報７０ｓと第２記憶媒体部１４０の包絡線情報１４０ｓとは測定系を基準クロック１１０によって同期した関係でサンプリング収集した結果、格納情報７０ｓと包絡線情報１４０ｓの両者間における受信フレームの対応関係が判る。この位置関係から、図２に示すように、正常に復調された受信フレームの包絡線情報１４０ｓ（図２Ｄ参照）が特定され、また復調不良となった受信フレームも特定されて、その受信信号の包絡線情報１４０ｓ（図２Ｅ参照）が特定されて得られることとなる。
これらから、受信情報３０ｓが取得できなかった受信情報「無し」（図２Ｃ参照）状況においても、正常に復調された受信フレームの包絡線と、復調不良となった当該受信フレームの包絡線の形状・振幅・幅等（図２Ｆ，Ｇ，Ｈ参照）とを比較解析することで、通信不能状態における妨害波等（図２Ｂ参照）による要因であるか否かが容易に特定可能となる。従来技術においては、区間Ａの受信情報３０ｓの取得情報のみであった為、通信断烈の要因を殆ど特定できなかった。従って、本発明の無線回線解析装置は有用なる利点を備えていることが判る。
【００３２】
次に、図３の無線回線解析装置の他の要部構成について説明する。図１では通信している状態を第３者的に測定する形態であるが、図３の構成では、送信に関する回路及び機能を追加して、被測定物（移動局・基地局）に対して通信を行いながら測定を行うことが可能である。
この構成要素は、図１の構成要素に対して、送信情報処理部１６０と、変調部１８０と、送信回路を備えるＲＦ部２００と、を追加した構成で実現できる。
中央演算処理部８０では、所望の送信情報８０ｓを生成して送信情報処理部１６０へ送出する。
送信情報処理部１６０では、通信方式に対応した通信フォーマットに変換した送信データ１６０ｄと送信クロック１６０ｃを変調部１８０へ送出する。
変調部１８０では、上記送信データ１６０ｄと送信クロック１６０ｃを受けて送信フレームに対応する信号に変調変換したＩＦ信号１８０ｓをＲＦ部２００へ送出する。
ＲＦ部２００では、上記ＩＦ信号１８０ｓを受けて、所望の周波数チャンネルへ周波数変換し、所定のタイムスロットに同期してアンテナより電波を送信する。
上記構成によれば、被測定物（移動局・基地局）に対して通信を行いながら測定を行うことが可能となる。また所望により基地局が備える通信制御機能を送信情報処理部１６０及び中央演算処理部８０に備える場合には、擬似基地局として機能させて移動局との間で試験条件を多様に制御しながらの試験実施可能である。
【００３３】
次に、図４の無線回線解析装置の他の要部構成について説明する。図１では通信している状態を連続的に記憶媒体に格納する例であったが、図４では例えばレイヤ２やレイヤ３の解析から通信不能状態に至った時点を検出し、これから所定時間以前からのＩＦ信号１０ｓを連続的に所定期間記憶媒体に格納する格納制御機能を備える構成例である。
この構成要素は、図１の構成要素に対して、取込信号３０ａを発生する受信情報処理部３０と、記憶媒体制御部１５０と、ＦＩＦＯメモリを備える第２記憶媒体部１４０とを備える構成で実現できる。
受信情報処理部３０では、通信不能状態に至り、一定時間の間、受信情報３０ｓがなければ通信断と判断して取込信号３０ａを送出する機能を追加する。
記憶媒体制御部１５０は、上記受信情報処理部３０からの取込信号３０ａを受けて、所定期間の間、記憶媒体への格納を許可する格納制御信号１５０ｓを第２記憶媒体部１４０へ送出する。例えば取込信号３０ａを受けてから１分間の期間、格納制御信号１５０ｓを送出する。
第２記憶媒体部１４０には、例えば、振幅情報４０ｓを受ける入力端にＦＩＦＯ（ Fast In Fast Out）メモリを追加して備える。このＦＩＦＯはＡＤＣ部４０からの連続する振幅情報４０ｓの入力データを所定期間遅延するバッファである。そのメモリ容量は少なくとも上記受信情報処理部３０が受信処理して取込信号３０ａが送出される受信フレームよりも数個以前の受信フレームから格納可能にする。この結果、比較的小容量の記憶媒体でも通信不能に至った時点前後の振幅情報４０ｓが格納される結果、的確に解析可能となる利点が得られる。
また、上記ＦＩＦＯを備える代わりに、所望容量の記憶媒体をリングバッファとし、常にオーバーライト格納とする格納制御を行い、上記取込信号３０ａを受けた時点から所定時間後にオーバーライト格納を停止させる制御方法で実現しても良い。
【００３４】
尚、本発明の実現手段は、上述実施の形態に限るものではない。例えば図１に示す受信系を複数チャンネル備えて同時受信する構成を備えることで、異なる周波数チャンネルに対して同時に受信測定して解析することで、周波数チャンネル間に係る信号波や妨害波の相関関係が明らかになる。例えばハンドオーバ（通信基地局の切り替え）時や、チャンネル切り替え時における複数チャンネルの周波数チャンネルの解析ができる。この結果、より一層的確な評価解析ができる利点が得られる。
【００３５】
また、図３に示す送信系を複数チャンネル備えて同時に送信可能な構成を備えることで、擬似的な複数移動局を実現できる。この結果、移動局や基地局に対して多様な送信出力を与えて、それらからの受信信号を測定解析することで、より一層的確な評価解析ができる利点が得られる。
また、受信系と送信系とを共に複数チャンネル備える構成として、更なる多様な評価解析ができるように構成しても良い。
【００３６】
また、ＰＨＳ等以外の他の移動体通信手段の通信手段に対しても、上述発明手段を適用することで、同様にして実施可能である。
【００３７】
【発明の効果】
本発明は、上述の説明内容から、下記に記載される効果を奏する。
上述説明したように本発明によれば、受信信号の包絡線や包絡線の過渡的変動が検出可能な高速サンプリングをするＡＤＣ部を備え、前期包絡線データを連続的に所定期間格納可能な格納手段を備える構成を具備したことにより、通信不能状態における妨害波等が受信信号の包絡線から容易に特定可能となる大きな利点が得られる。これから通信障害時においての的確なる解析が可能となる。従って本発明の技術的効果は大であり、産業上の経済効果も大である。
【図面の簡単な説明】
【図１】本発明の、無線回線解析装置の要部構成図。
【図２】本発明の、通信不能状態と測定情報を示すタイムチャート。
【図３】本発明の、無線回線解析装置の他の要部構成図。
【図４】本発明の、無線回線解析装置の他の要部構成図。
【図５】従来の、無線回線解析装置の要部構成図。
【図６】従来の、通信不能状態と測定情報を示すタイムチャート。
【符号の説明】
１０，２００ＲＦ部
２０復調部
３０受信情報処理部
４０ＡＤＣ部
５０振幅検出部
６０タイマー部
７０第１記憶媒体部
８０中央演算処理部
１１０基準クロック
１２０第１分周器
１３０第２分周器
１４０第２記憶媒体部
１５０記憶媒体制御部
１６０送信情報処理部
１８０変調部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless line analyzing apparatus that analyzes a state of wireless communication. In particular, the present invention relates to a radio network analyzer capable of accurately capturing difficult situations such as interference due to reflection and diffraction of communication radio waves and interference with other signals.
[0002]
[Prior art]
A configuration of a main part of a conventional radio network analyzer will be described with reference to FIG.
The main configuration includes an RF unit 10, a demodulation unit 20, a reception information processing unit 30, an ADC unit 40, an amplitude detection unit 50, a timer unit 60, a first storage medium unit 70, and a central processing unit. 80. It is assumed that the communication radio wave is a time division multiple access (TDMA) radio wave of a PHS (Personal Handyphone System) which is a simple mobile phone. The base station assigns and controls communication slots to mobile stations, and controls outgoing calls, incoming calls, channel switching during a call, service identification, and the like. The mobile station transmits and receives using a communication slot assigned based on the control of the base station. The communication slot has an idle period and a transmission output period, and is transmitted in bursts from the mobile station and the base station every predetermined time slot period.
[0003]
The RF unit 10 receives a communication radio wave from an antenna, receives a frequency signal of a target frequency channel, converts the frequency into a predetermined intermediate frequency signal (IF signal) 10 s, and supplies this to the demodulation unit 20 and the ADC unit 40. .
[0004]
Upon receiving the IF signal 10s, the demodulator 20 performs demodulation processing by synchronizing the communication frame (received frame) generated in a burst manner, and receives the obtained received information signal 20d and the synchronized clock 20c as the received information processor 30. To send.
[0005]
The reception information processing unit 30 receives the reception information signal 20d and the synchronization clock 20c, and generates various control signals in the reception frame based on the communication protocol if it can be demodulated. The reception information 30 s obtained by generating the sequence status is sent to the first storage medium unit 70. The timing signal of the received frame is sent to the timer unit 60 as a time detection signal 30t. In addition, a received frame detection signal 30m indicating normal demodulation is sent to the amplitude detector 50. In the case of a received frame that has been demodulated due to interference or the like, naturally the received frame detection signal 30m is not output.
[0006]
The timer unit 60 generates a time stamp signal for the received frame. In other words, the time information of the built-in clock is generated internally, the time information 60 s is received when the time detection signal 30 t from the reception information processing unit 30 is received, and the time information 60 s is stored in the first storage medium unit 70. Send it out.
[0007]
The ADC unit 40 receives the analog IF signal 10 s corresponding to the received electric field intensity from the RF unit 10, and sends the AD converted amplitude information 40 s to the amplitude detection unit 50.
[0008]
When the amplitude detection unit 50 receives the amplitude information 40s and receives the reception frame detection signal 30m from the reception information processing unit 30, the amplitude detection unit 50 obtains a peak level value and an average value level value in the frame period, and obtains the received reception level detection value 30m. The frame amplitude information 50 s is sent to the first storage medium unit 70.
[0009]
The first storage medium unit 70 sequentially stores the reception information 30s in the received frame unit, the time information 60s and the amplitude information 50s at that time in the storage medium. Accordingly, if the received frame detection signal 30m cannot be obtained due to interference or the like, the information on the demodulation-defective frame is not stored and is a missing frame.
[0010]
The central processing unit 80 reads out the storage information 70s of the first storage medium unit 70, receives the reception information 30s of a plurality of reception frames acquired in a predetermined period, the time information 60s at that time, and the amplitude information 50s, the period The communication information is processed and output in a desired display form. For example, from the received information 30s, the layer 2/3 content display of the control channel Cch and the communication channel Tch, the display of communication sequences such as incoming / outgoing calls and assignments, the display of communication traffic status, etc. Second, from the amplitude information 50s, the peak level and average value level of the electric field strength for each received frame are displayed. From these, the communication status is monitored and analyzed.
If the central processing unit 80 includes, for example, a DSP (Digital Signal Processor), the processing capability to be processed by the reception information processing unit 30 is determined by the central processing unit 80 as desired. It is good also as a structure form which implements the process of the part 30. FIG.
[0011]
Next, the communication disabled state will be described with reference to FIG.
It is assumed that the signal wave and the interference wave (see FIG. 6B) shown in the figure are generated with time.
In section A, the received frame is demodulated, and the received information 30 s, time information 60 s, and amplitude information 50 s are stored in the first storage medium unit 70. Therefore, the reception information is “present”.
On the other hand, section B is a section that cannot be demodulated due to interference due to reflection or diffraction of communication radio waves or other interference waves, and as a result of the reception frame becoming a demodulation error, the reception information 30 s, time information 60 s, and amplitude information 50 s It is not stored in the storage medium unit 70. Accordingly, the reception information is “none” (see FIG. 6C). Since the measurement information at that time cannot be obtained when the communication is interrupted, the cause of the communication error abnormality cannot be analyzed.
[0012]
[Problems to be solved by the invention]
As described above, in the prior art, the cause of abnormality such as disruption of communication is a phenomenon peculiar to a radio channel, that is, fading due to a large number of random composite waves caused by reflection / diffraction or interference with other signals. It is not possible to identify such factors. That is, in a situation where the received frame is not demodulated, there is a problem that no measurement information can be obtained and cause analysis cannot be performed. In this respect, the wireless circuit analyzer of the prior art is not preferable and has a practical difficulty.
Therefore, the problem to be solved by the present invention is to provide a wireless line analyzing apparatus that includes means for acquiring envelope information of received radio waves and that can accurately analyze a communication state even in a situation where a received frame is not demodulated. That is.
[0013]
[Means for Solving the Problems]
First, in order to solve the above-described problem, in the configuration of the present invention, a radio channel that receives radio waves from a radio channel, generates reception information corresponding to a communication protocol, and analyzes a communication state of the radio channel In the analysis device,
A radio network analyzer comprising envelope measuring means for measuring an envelope of a signal level of a received radio wave at least in a communication disabled state.
According to the above-described invention, it is possible to realize a radio network analyzer that includes means for acquiring envelope information of received radio waves and that can accurately analyze a communication state even in a situation where a received frame is not demodulated.
[0014]
Secondly, in order to solve the above problem, in the configuration of the present invention, a radio channel that receives radio waves from a radio channel, generates reception information corresponding to a communication protocol, and analyzes a communication state of the radio channel In the analysis device,
There is a wireless line analyzer characterized by comprising a plurality of envelope measuring means for measuring an envelope of a signal level of a received radio wave at least in a communication disabled state.
[0015]
Thirdly, in order to solve the above-described problem, in the configuration of the present invention, a radio channel that receives radio waves from a radio channel, generates reception information corresponding to a communication protocol, and analyzes a communication state of the radio channel. In the analysis device,
Provide envelope measurement means for measuring the envelope of the signal level of the received radio wave at least in the communication disabled state, generate transmission information corresponding to the communication protocol, and communicate with the communication partner device of the mobile station or base station There is a wireless line analyzer characterized by comprising a transmission means.
[0016]
As the envelope measuring means, an incommunicable state is detected from the received radio wave signal, and the envelope of the signal level of the received radio wave is determined for a predetermined period thereafter from a predetermined time starting from the reception frame incapable of communication. Envelope data storage means for continuously storing the sampled and quantized envelope data in a storage medium (for example, the second storage medium unit 140), and reading out the continuous envelope data from the storage medium for communication There is an above-described wireless line analyzing apparatus characterized by comprising an envelope analyzing means for analyzing an envelope of a signal level of a radio signal in an impossible state.
[0017]
As the envelope measuring means, an incommunicable state is detected from the received radio wave signal, and the envelope of the signal level of the received radio wave is determined for a predetermined period thereafter from a predetermined time starting from the reception frame incapable of communication. Envelope data storage means for continuously storing the sampled and quantized envelope data in the storage medium, and reading the continuous envelope data from the storage medium (for example, the second storage medium unit 140) Envelope analysis means for reading received information 30s normally received before communication is impossible from another storage medium (for example, the first storage medium unit 70) and analyzing the envelope of the signal level of the radio signal in the communication disabled state. There is provided the above-described wireless line analyzing apparatus.
[0018]
The envelope data storage means receives an IF signal 10s from the RF unit 10 that receives a communication radio wave by an antenna and converts the frequency signal of a target frequency channel into an intermediate frequency signal (IF signal) 10s, and the ADC unit 40 And a configuration means for storing the quantized and converted amplitude information 40 s in the second storage medium unit 140 at a high speed so that a transient change in the envelope of the IF signal 10 s can be acquired. There is the above-described wireless line analyzer.
[0019]
The envelope data storage means receives an IF signal 10s from the RF unit 10 that receives a communication radio wave by an antenna and converts the frequency signal of a target frequency channel into an intermediate frequency signal (IF signal) 10s, and the ADC unit 40 And a means for storing the amplitude information 40 s that has been quantized and converted into the second storage medium unit 140 so that a transient change in the envelope of the IF signal 10 s can be acquired. In response to this, the reception information processing unit 30 detects that the reception information processing unit 30 has received the received information, and the storage control for storing the amplitude information 40 s in a predetermined period before and after the reception frame incapable of communication in the second storage medium unit 140. There is the above-mentioned wireless line analyzing apparatus characterized by comprising means (for example, storage medium control unit 150).
[0020]
As the envelope analysis means, continuous envelope data from the storage medium is read out, and both the envelope of the signal level of the radio signal in the communication disabled state and the envelope of the signal level of the radio signal in the normal communication state There is an above-described wireless line analyzing apparatus characterized in that it is an envelope analyzing means for comparing and analyzing.
[0021]
The wireless channel analysis described above, wherein the transmission means is a transmission means for generating transmission information corresponding to a pseudo mobile station corresponding to a communication protocol and communicating with a communication partner device of the mobile station or base station There is a device.
[0022]
The wireless channel analysis described above, wherein the transmission means is a transmission means that generates transmission information corresponding to a pseudo base station corresponding to a communication protocol and communicates with a mobile station or a communication partner device of the base station There is a device.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings together with examples.
[0024]
FIG. 1 is a block diagram of the main part of the wireless line analyzing apparatus of FIG. 1, a time chart showing the communication disabled state and measurement information of FIG. This will be described below with reference to FIG. In addition, the element corresponding to a conventional structure attaches | subjects the same code | symbol.
[0025]
First, the configuration of the main part of the radio network analyzer of the present invention will be described with reference to FIG.
The main configuration includes an RF unit 10, a demodulation unit 20, a reception information processing unit 30, an ADC unit 40, an amplitude detection unit 50, a timer unit 60, a first storage medium unit 70, and a central processing unit. 80, a second storage medium unit 140, a reference clock 110, a first frequency divider 120, and a second frequency divider 130. This is a configuration in which a second storage medium unit 140, a reference clock 110, a first frequency divider 120, and a second frequency divider 130 are added to the conventional configuration.
[0026]
The reference clock 110 is a reference timing clock for ensuring the synchronization relationship of the entire measurement data, and supplies this reference timing clock 110 c to the timer unit 60 and the first frequency divider 120.
[0027]
The timer unit 60 generates a time stamp signal for a received frame synchronized with the reference clock 110. That is, the precise time information of the internal clock is generated internally based on the reference timing clock 110c, and the time information 60s when the time detection signal 30t is received from the reception information processing unit 30 is retained. The time information 60 s is sent to the first storage medium unit 70.
[0028]
The ADC unit 40 uses an AD converter capable of high-speed sampling, for example, an AD converter of 10 M sampling / second, to the extent that a transient change in the envelope of the IF signal 10 s can be sampled. Then, the IF signal 10 s is obtained by continuously sampling the reference timing clock 110 c at a high speed by the first divided clock 120 c (for example, 10 MHz) obtained by dividing the reference timing clock 110 c to a desired 1 / N by the first divider 120. The amplitude information 40 s that is continuous code data is sent to the amplitude detector 50 and the second storage medium unit 140.
[0029]
The amplitude detection unit 50 is the same as the conventional one. When receiving the amplitude information 40s and receiving the reception frame detection signal 30m from the reception information processing unit 30, the amplitude detection unit 50 calculates the peak level value and the average value level value in the frame period. It is obtained and sent to the first storage medium unit 70 as amplitude information 50s of the received frame.
[0030]
The second storage medium unit 140 uses a storage medium having a large storage capacity. Then, the continuous high-speed amplitude information 40 s is compressed or converted into envelope information by the frequency-divided clock 130 c obtained by frequency-dividing the first frequency-divided clock 120 c into a desired 1 / M by the second frequency divider 130. Store. Note that the divided value M may be set to M = 1 if the storage medium has a sufficiently large capacity and can be stored at high speed, and all the sampled amplitude information 40s may be stored. As a result, the temporal level of the IF signal 10s, that is, the envelope of the level for each received frame and the transient fluctuation of the envelope can be detected. In addition, the correspondence between the information stored in the first storage medium unit 70 and the second storage medium unit 140 can be determined based on the positional relationship between the data based on the sampling numbers of the time information 60s and the amplitude information 40s.
Note that the first storage medium unit 70 and the second storage medium unit 140 may be the same.
[0031]
The following processing means is added to the central processing unit 80. That is, the storage information 70s and the envelope information 140s of the first storage medium unit 70 and the envelope information 140s of the second storage medium unit 140 are sampled and collected in a relationship in which the measurement system is synchronized with the reference clock 110. The correspondence of received frames between the two can be understood. From this positional relationship, as shown in FIG. 2, the envelope information 140s (see FIG. 2D) of the normally demodulated received frame is specified, and the received frame in which the demodulation is poor is also specified. The envelope information 140s (see FIG. 2E) is specified and obtained.
From these, even in the situation of the reception information “none” (see FIG. 2C) in which the reception information 30 s could not be acquired, the envelope of the reception frame that was normally demodulated and the shape of the envelope of the reception frame that caused demodulation failure By comparing and analyzing the amplitude, width, etc. (see FIGS. 2F, G, and H), it is possible to easily identify whether or not the cause is a disturbing wave or the like (see FIG. 2B) in a communication disabled state. In the prior art, since only the acquisition information of the reception information 30s in the section A is included, the cause of the communication disruption could hardly be specified. Therefore, it can be seen that the radio network analyzer of the present invention has useful advantages.
[0032]
Next, another configuration of the main part of the wireless line analyzing apparatus of FIG. 3 will be described. In FIG. 1, the communication state is measured by a third party. However, in the configuration of FIG. 3, a circuit and a function related to transmission are added to the device under test (mobile station / base station). Measurements can be performed while communicating.
This component can be realized by adding a transmission information processing unit 160, a modulation unit 180, and an RF unit 200 including a transmission circuit to the components in FIG.
The central processing unit 80 generates desired transmission information 80 s and sends it to the transmission information processing unit 160.
The transmission information processing unit 160 sends the transmission data 160d and the transmission clock 160c converted to the communication format corresponding to the communication method to the modulation unit 180.
Modulator 180 receives transmission data 160d and transmission clock 160c, and sends IF signal 180s modulated to a signal corresponding to the transmission frame to RF unit 200.
The RF unit 200 receives the IF signal 180s, converts the frequency into a desired frequency channel, and transmits radio waves from the antenna in synchronization with a predetermined time slot.
According to the above configuration, it is possible to perform measurement while communicating with the device under test (mobile station / base station). If the transmission information processing unit 160 and the central processing unit 80 are provided with a communication control function provided in the base station as desired, the base station functions as a pseudo base station while controlling various test conditions with the mobile station. Tests can be conducted.
[0033]
Next, another configuration of the main part of the wireless line analyzing apparatus shown in FIG. 4 will be described. FIG. 1 shows an example in which the state of communication is continuously stored in the storage medium. However, in FIG. 4, for example, a point in time when communication is disabled from the analysis of layer 2 or layer 3 is detected. This is a configuration example provided with a storage control function for continuously storing IF signals 10s from the storage medium in a storage medium for a predetermined period.
This component is configured to include a reception information processing unit 30 that generates a capture signal 30a, a storage medium control unit 150, and a second storage medium unit 140 that includes a FIFO memory, as compared to the component of FIG. realizable.
The reception information processing unit 30 adds a function of determining that communication is interrupted if the reception information 30s is not received for a certain period of time and communication is interrupted, and sending the capture signal 30a.
The storage medium control unit 150 receives the capture signal 30a from the reception information processing unit 30 and sends a storage control signal 150s that permits storage in the storage medium to the second storage medium unit 140 for a predetermined period. . For example, the storage control signal 150s is transmitted for a period of one minute after receiving the capture signal 30a.
The second storage medium unit 140 includes, for example, a FIFO (Fast In Fast Out) memory added to the input end that receives the amplitude information 40s. The FIFO is a buffer that delays input data of continuous amplitude information 40s from the ADC unit 40 for a predetermined period. The memory capacity can be stored from at least several reception frames before the reception frame in which the reception information processing unit 30 performs reception processing and the capture signal 30a is transmitted. As a result, even when the storage medium has a relatively small capacity, the amplitude information 40s before and after the point at which communication is disabled is stored. As a result, an advantage that accurate analysis can be obtained is obtained.
Further, instead of providing the FIFO, a storage medium having a desired capacity is used as a ring buffer, and storage control is always performed to perform overwrite storage, and control to stop overwrite storage after a predetermined time from the time when the capture signal 30a is received. It may be realized by a method.
[0034]
Note that the means for realizing the present invention is not limited to the above-described embodiment. For example, the reception system shown in FIG. 1 is provided with a plurality of channels for simultaneous reception, and by receiving and measuring simultaneously for different frequency channels and analyzing them, the correlation between signal waves and interference waves between the frequency channels. Becomes clear. For example, a plurality of frequency channels can be analyzed at the time of handover (communication base station switching) or channel switching. As a result, there is an advantage that more accurate evaluation analysis can be performed.
[0035]
In addition, by providing a transmission system shown in FIG. 3 having a plurality of channels and capable of transmitting simultaneously, a pseudo plurality of mobile stations can be realized. As a result, it is possible to obtain an advantage that more accurate evaluation analysis can be performed by giving various transmission outputs to the mobile station and the base station and measuring and analyzing the received signals from them.
In addition, a configuration in which both the reception system and the transmission system are provided with a plurality of channels may be configured so that further various evaluation analyzes can be performed.
[0036]
Moreover, it can implement similarly by applying the above-mentioned invention means also to the communication means of other mobile communication means other than PHS or the like.
[0037]
【The invention's effect】
The present invention has the following effects from the above description.
As described above, according to the present invention, an ADC unit that performs high-speed sampling capable of detecting an envelope of a received signal and a transient variation of the envelope is provided, and storage in which envelope data can be stored continuously for a predetermined period of time. By providing the configuration including the means, it is possible to obtain a great advantage that the interference wave or the like in the communication disabled state can be easily specified from the envelope of the received signal. This makes it possible to perform an accurate analysis when a communication failure occurs. Therefore, the technical effect of the present invention is great, and the industrial economic effect is also great.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a main part of a radio network analyzer according to the present invention.
FIG. 2 is a time chart showing an incommunicable state and measurement information according to the present invention.
FIG. 3 is a block diagram showing another main part of the wireless line analyzing apparatus according to the present invention.
FIG. 4 is a block diagram showing another main part of the radio network analyzer according to the present invention.
FIG. 5 is a configuration diagram of a main part of a conventional radio network analyzer.
FIG. 6 is a time chart showing a conventional communication disabled state and measurement information.
[Explanation of symbols]
10, 200 RF unit 20 Demodulating unit 30 Reception information processing unit 40 ADC unit 50 Amplitude detecting unit 60 Timer unit 70 First storage medium unit 80 Central processing unit 110 Reference clock 120 First frequency divider 130 Second frequency divider 140 Second storage medium unit 150 Storage medium control unit 160 Transmission information processing unit 180 Modulation unit

Claims

In a wireless line analysis device that receives radio waves from a wireless line, generates reception information corresponding to the communication protocol, and analyzes the communication state of the wireless line.
An envelope measuring means for measuring an envelope of a signal level of a received radio wave at least in a communication disabled state;
The envelope measuring means is
An incommunicable state is detected from the received radio wave signal, and the envelope of the signal level of the received radio wave is sampled and quantized for a predetermined period after the predetermined time starting from the reception frame incapable of communication. Envelope data storage means for continuously storing envelope data in a storage medium;
Envelope analysis means for reading continuous envelope data from the storage medium and analyzing the envelope of the signal level of the radio signal in the communication disabled state;
No line line analyzer you comprising: a.

In a wireless line analysis device that receives radio waves from a wireless line, generates reception information corresponding to the communication protocol, and analyzes the communication state of the wireless line.
An envelope measuring means for measuring an envelope of a signal level of a received radio wave at least in a communication disabled state;
The envelope measuring means is
An incommunicable state is detected from the received radio wave signal, and the envelope of the signal level of the received radio wave is sampled and quantized for a predetermined period after the predetermined time starting from the reception frame incapable of communication. Envelope data storage means for continuously storing envelope data in a storage medium;
An envelope analysis means for reading continuous envelope data from the storage medium, reading received information normally received from the storage medium, and analyzing an envelope of a signal level of a radio wave signal in a communication disabled state;
No line line analyzer you comprising: a.

In a wireless line analysis device that receives radio waves from a wireless line, generates reception information corresponding to the communication protocol, and analyzes the communication state of the wireless line.
An envelope measuring means for measuring an envelope of a signal level of a received radio wave at least in a communication disabled state;
The envelope measuring means is
An incommunicable state is detected from the received radio wave signal, and the envelope of the signal level of the received radio wave is sampled and quantized for a predetermined period after the predetermined time starting from the reception frame incapable of communication. Envelope data storage means for continuously storing envelope data in a storage medium;
Envelope analysis for reading continuous envelope data from the storage medium, reading reception information received normally before the communication is disabled from the storage medium, and analyzing the signal level envelope of the radio signal in the communication disabled state Means,
No line line analyzer you comprising: a.

The radio network analyzer according to any one of claims 1 to 3,
The envelope data storage means includes
Receives the communication radio wave from the antenna, receives the IF signal from the RF unit that converts the frequency signal of the target frequency channel into an intermediate frequency signal (IF signal), and the ADC unit performs a transient change in the envelope of the IF signal. There obtainable fast sampled by converting quantized, non linear line analyzer you characterized in that it comprises a configuration means for storing amplitude information converted quantized to the storage medium unit.

The radio network analyzer according to any one of claims 1 to 3,
The envelope data storage means includes
Receives the communication radio wave from the antenna, receives the IF signal from the RF unit that converts the frequency signal of the target frequency channel into an intermediate frequency signal (IF signal), and the ADC unit performs a transient change in the envelope of the IF signal. Means for acquiring and high-speed sampling and quantizing transform, and storing the quantized amplitude information in the storage medium unit;
A storage control means for detecting that the communication incompletion state has been reached and receiving this, and storing the amplitude information for a predetermined period before and after the reception frame incapable of communication in the storage medium unit; ,
No line line analyzer you comprising: a.

The radio network analyzer according to any one of claims 1 to 3,
The envelope analysis means includes
Read the continuous envelope data from the storage medium, and analyze by comparing the envelope of the signal level of the radio signal in the communication disabled state and the envelope of the signal level of the radio signal in the normal communication state. No line line analyzer you being a envelope analyzer.

The radio network analyzer according to any one of claims 1 to 3,
A radio network analyzer comprising a plurality of channels of the envelope measuring means.

The radio network analyzer according to any one of claims 1 to 3,
A transmission means for generating transmission information corresponding to the communication protocol and communicating with a communication partner device of the mobile station or the base station,
A wireless line analyzing apparatus comprising:

The radio network analyzer according to claim 8,
The transmission unit, no line line you being a transmission means which communicates with the communication partner device of the mobile station or the base station generates the transmission information corresponding to the pseudo mobile station corresponding to the communication protocol Analysis device.

The radio network analyzer according to claim 8,
The transmission unit, no line line you being a transmission means which communicates with the communication partner device of the mobile station or the base station generates the transmission information corresponding to the pseudo base station corresponding to the communication protocol Analysis device.