JP2012004659A - Handover method and radio communication apparatus - Google Patents

Handover method and radio communication apparatus Download PDF

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JP2012004659A
JP2012004659A JP2010135135A JP2010135135A JP2012004659A JP 2012004659 A JP2012004659 A JP 2012004659A JP 2010135135 A JP2010135135 A JP 2010135135A JP 2010135135 A JP2010135135 A JP 2010135135A JP 2012004659 A JP2012004659 A JP 2012004659A
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communication network
threshold value
reception level
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rssi
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JP5117539B2 (en
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Kengo Nagata
健悟 永田
Makoto Umeuchi
誠 梅内
Akira Kishida
朗 岸田
Takeshi Hirakuri
健史 平栗
Tomohiro Tokuyasu
朋浩 徳安
Toshihiro Manabe
利裕 眞部
Hiroshi Hojo
博史 北條
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Nippon Telegraph and Telephone Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a handover method and a radio communication apparatus in which a stable handover can be performed between a mobile communication network and a radio LAN and the handover can be performed without intercepting data communication.SOLUTION: A radio communication apparatus can be connected to a first communication network and a second communication network. It is connected to the first communication network when a reception level of the first communication network exceeds a threshold value, and it is connected to the second communication network when the reception level of the first communication network becomes equal to or lower than the threshold value. The radio communication apparatus includes a means for switching to the first communication network when the reception level of the first communication network exceeds the threshold continuously for a predetermined term during a connection with the second communication network, and a means for switching to the second communication network when the reception level of the first communication network becomes equal to or lower than the threshold continuously for the predetermined term during a connection with the first communication network.

Description

本発明は、移動通信網と無線ＬＡＮに接続可能な無線通信装置において、移動通信網と無線ＬＡＮとの接続先切替を行うハンドオーバ方法および無線通信装置に関する。   The present invention relates to a handover method and a wireless communication apparatus for switching a connection destination between a mobile communication network and a wireless LAN in a wireless communication apparatus connectable to a mobile communication network and a wireless LAN.

ここで、無線通信装置は、移動通信網と無線ＬＡＮの双方に接続できる２つのインタフェース（ＩＦ）を備えた移動端末であってもよいし、移動端末と移動通信網または無線ＬＡＮとを中継する無線中継装置のＷＡＮ側の通信機能部であってもよい。   Here, the wireless communication apparatus may be a mobile terminal having two interfaces (IF) that can be connected to both the mobile communication network and the wireless LAN, or relays between the mobile terminal and the mobile communication network or the wireless LAN. It may be a communication function unit on the WAN side of the wireless relay device.

また、移動通信網は、例えば第３世代および第3.5 世代の携帯電話網であり、その規格としては、例えばＨＳＤＰＡ（High speed downlink packet access)、ＷＣＤＭＡ（Wide band code division multiple access)、ＥＤＧＥ（Enhanced data rates for GSM evolution)などである。   The mobile communication network is, for example, a 3rd generation or 3.5th generation mobile phone network, and standards include, for example, HSDPA (High speed downlink packet access), WCDMA (Wide band code division multiple access), EDGE (Enhanced data rates for GSM evolution).

移動通信網と無線ＬＡＮを比較した場合、一般的に移動通信網はカバーエリアは広いが通信速度は遅く、無線ＬＡＮはカバーエリアは狭いが通信速度は速いという特徴がある。そこで、移動通信網と無線ＬＡＮのそれぞれの特徴を活かせる無線通信装置として、移動通信網と無線ＬＡＮの双方に接続できる２つのＩＦを備え、通常は携帯電話網に接続しながら、無線ＬＡＮとの接続が可能な状況になれば無線ＬＡＮに切り替える無線通信装置がある（特許文献１）。   When comparing a mobile communication network and a wireless LAN, the mobile communication network is generally characterized in that the coverage area is wide but the communication speed is low, and the wireless LAN has a narrow cover area but a high communication speed. Therefore, as a wireless communication device that can make use of the characteristics of the mobile communication network and the wireless LAN, the wireless communication device includes two IFs that can be connected to both the mobile communication network and the wireless LAN. There is a wireless communication device that switches to a wireless LAN when the connection becomes possible (Patent Document 1).

ここで、移動通信網と無線ＬＡＮのハンドオーバ方法として、無線ＬＡＮの受信レベル（ＲＳＳＩ）を監視し、当該受信レベルが閾値以下であれば移動通信網に接続し、当該受信レベルが閾値を超えれば無線ＬＡＮに接続する方法がある。例えば、図９に示すように、移動通信網エリア内に無線ＬＡＮエリアが局所的に存在しているときに、無線通信装置が移動通信網エリア内かつ無線ＬＡＮエリア外にいれば、無線ＬＡＮの受信レベルが閾値以下であるので移動通信網に接続する。また、無線通信装置が無線ＬＡＮエリア内に入り、無線ＬＡＮの受信レベルが閾値を超えれば無線ＬＡＮに接続する。   Here, as a method of handover between the mobile communication network and the wireless LAN, the reception level (RSSI) of the wireless LAN is monitored, and if the reception level is below the threshold, the mobile communication network is connected. If the reception level exceeds the threshold, There is a method of connecting to a wireless LAN. For example, as shown in FIG. 9, when a wireless LAN area is locally present in a mobile communication network area, if the wireless communication device is within the mobile communication network area and outside the wireless LAN area, Since the reception level is below the threshold value, the mobile communication network is connected. Further, if the wireless communication apparatus enters the wireless LAN area and the reception level of the wireless LAN exceeds a threshold value, the wireless communication apparatus is connected to the wireless LAN.

特開２０１０−０２１８７８号公報JP 2010-021878 A

移動通信網と無線ＬＡＮとの間で行われるハンドオーバは、無線ＬＡＮの受信レベルと閾値との比較のみによって行われていた。そのため、受信レベルが閾値を挟んで短時間に変動する場合にハンドオーバが頻繁に発生し、その都度通信回線が切断される問題がある。無線ＬＡＮの受信レベルが閾値を挟んで短時間に変動する状況としては、無線通信装置が無線ＬＡＮエリアの境界付近にあって受信レベルが安定しない場合、無線ＬＡＮエリア内でも電波の状態によって一時的に受信レベルが閾値以下になる場合、一時的に無線通信装置が無線ＬＡＮエリアを通過する場合などである。   The handover performed between the mobile communication network and the wireless LAN is performed only by comparing the reception level of the wireless LAN with a threshold value. For this reason, when the reception level fluctuates in a short time with a threshold in between, handover frequently occurs, and there is a problem that the communication line is disconnected each time. The situation in which the reception level of the wireless LAN fluctuates in a short time across the threshold is that if the wireless communication device is near the boundary of the wireless LAN area and the reception level is not stable, it may be temporarily in the wireless LAN area depending on the radio wave condition. When the reception level is less than or equal to the threshold value, the wireless communication apparatus temporarily passes through the wireless LAN area.

また、ハンドオーバの契機が無線ＬＡＮの受信レベルと閾値との比較のみであり、データ通信のトラヒックに無関係にハンドオーバが行われている。そのため、ハンドオーバによってＩＰアドレスの変更等の処理の際にいずれにも接続していない（切断）状態になり、データ通信が突然終了する問題がある。   In addition, the trigger for handover is only a comparison between the reception level of the wireless LAN and a threshold value, and handover is performed regardless of data communication traffic. For this reason, there is a problem that the data communication is suddenly terminated due to the connection (disconnection) being not established in any of the processes such as changing the IP address due to handover.

本発明は、移動通信網と無線ＬＡＮとの間で安定したハンドオーバを行うことができ、またデータ通信を中断させることなくハンドオーバを行うことができるハンドオーバ方法および無線通信装置を提供することを目的とする。   An object of the present invention is to provide a handover method and a wireless communication apparatus capable of performing a stable handover between a mobile communication network and a wireless LAN, and capable of performing a handover without interrupting data communication. To do.

第１の発明は、第１の通信網と第２の通信網に接続可能であり、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続する無線通信装置において、第２の通信網と接続中に、第１の通信網の受信レベルが所定期間継続して閾値を超えたときに第１の通信網に切り替え、第１の通信網と接続中に、第１の通信網の受信レベルが所定期間継続しての閾値以下のときに第２の通信網に切り替える手段を備える。   The first invention is connectable to the first communication network and the second communication network, and connects to the first communication network if the reception level of the first communication network exceeds a threshold value. In the wireless communication apparatus connected to the second communication network, the reception level of the first communication network continuously exceeds the threshold for a predetermined period while connected to the second communication network. Means for switching to the first communication network, and switching to the second communication network when the reception level of the first communication network is below a threshold for a predetermined period during connection with the first communication network. .

第２の発明は、第１の通信網と第２の通信網に接続可能であり、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続する無線通信装置において、第２の通信網と接続中に、第１の通信網の受信レベルが所定期間継続して閾値より大きい第１の閾値を超えたときに第１の通信網に切り替え、第１の通信網と接続中に、第１の通信網の受信レベルが所定期間継続して閾値より小さい第２の閾値以下のときに第２の通信網に切り替える手段を備える。   The second invention is connectable to the first communication network and the second communication network, and connects to the first communication network if the reception level of the first communication network exceeds a threshold value. In the wireless communication apparatus connected to the second communication network, the reception level of the first communication network is continuously higher than the threshold value for a predetermined period while connected to the second communication network. Switch to the first communication network when the threshold value of 1 is exceeded, and the connection level of the first communication network continues for a predetermined period and stays below the second threshold value that is smaller than the threshold value while connected to the first communication network Means for switching to the second communication network.

第３の発明は、第１の通信網と第２の通信網に接続可能であり、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続する無線通信装置において、第２の通信網と接続中に、第１の通信網の受信レベルが閾値より大きい第１の閾値を超え、かつ閾値より小さい第２の閾値以下にならない期間が所定期間継続したときに第１の通信網に切り替え、第１の通信網と接続中に、第１の通信網の受信レベルが第２の閾値以下となり、かつ第１の閾値を超えない期間が所定期間継続したときに第２の通信網に切り替える手段を備える。   The third invention is connectable to the first communication network and the second communication network, and connects to the first communication network if the reception level of the first communication network exceeds a threshold value. In the wireless communication apparatus connected to the second communication network, the reception level of the first communication network exceeds the first threshold value greater than the threshold value when connected to the second communication network. When the period that does not fall below the second threshold value less than the threshold value continues for a predetermined period, the first communication network is switched to the first communication network, and the reception level of the first communication network is the second A means for switching to the second communication network is provided when a period that is equal to or less than the threshold and does not exceed the first threshold continues for a predetermined period.

第１〜第３の発明の無線通信装置において、第１の通信網と第２の通信網との間の切り替えは、通信中のトラヒックを監視し、当該トラヒックがない期間が所定期間継続したときに実行する手段を備えてもよい。   In the wireless communication device of the first to third inventions, the switching between the first communication network and the second communication network is performed by monitoring the traffic during communication and a period in which there is no such traffic continues for a predetermined period. There may be provided means for executing.

第１〜第３の発明の無線通信装置において、第１の通信網は無線ＬＡＮであり、第２の通信網は移動通信網である。   In the wireless communication devices of the first to third inventions, the first communication network is a wireless LAN, and the second communication network is a mobile communication network.

第４の発明は、第１の通信網と第２の通信網に接続可能な無線通信装置であって、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続するハンドオーバ方法において、第２の通信網と接続中に、第１の通信網の受信レベルが所定期間継続して閾値を超えたときに第１の通信網に切り替え、第１の通信網と接続中に、第１の通信網の受信レベルが所定期間継続しての閾値以下のときに第２の通信網に切り替える。   A fourth invention is a wireless communication apparatus connectable to the first communication network and the second communication network, and connects to the first communication network if the reception level of the first communication network exceeds a threshold, In the handover method for connecting to the second communication network if the reception level of the first communication network is equal to or lower than the threshold value, the reception level of the first communication network continues for a predetermined period while connected to the second communication network. Switch to the first communication network when the threshold is exceeded, and switch to the second communication network when the reception level of the first communication network is equal to or lower than the threshold for a predetermined period during connection with the first communication network. Switch.

第５の発明は、第１の通信網と第２の通信網に接続可能な無線通信装置であって、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続するハンドオーバ方法において、第２の通信網と接続中に、第１の通信網の受信レベルが所定期間継続して閾値より大きい第１の閾値を超えたときに第１の通信網に切り替え、第１の通信網と接続中に、第１の通信網の受信レベルが所定期間継続して閾値より小さい第２の閾値以下のときに第２の通信網に切り替える。   A fifth invention is a wireless communication apparatus connectable to the first communication network and the second communication network, and connects to the first communication network if the reception level of the first communication network exceeds a threshold, In the handover method for connecting to the second communication network if the reception level of the first communication network is equal to or lower than the threshold value, the reception level of the first communication network continues for a predetermined period while connected to the second communication network. When the first threshold value greater than the threshold value is exceeded, the second communication network is switched to the first communication network. While connected to the first communication network, the reception level of the first communication network continues for a predetermined period of time and is smaller than the second threshold value. Switch to the second communication network when below the threshold.

第６の発明は、第１の通信網と第２の通信網に接続可能な無線通信装置であって、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続するハンドオーバ方法において、第２の通信網と接続中に、第１の通信網の受信レベルが閾値より大きい第１の閾値を超え、かつ閾値より小さい第２の閾値以下にならない期間が所定期間継続したときに第１の通信網に切り替え、第１の通信網と接続中に、第１の通信網の受信レベルが第２の閾値以下となり、かつ第１の閾値を超えない期間が所定期間継続したときに第２の通信網に切り替える。   A sixth invention is a wireless communication apparatus connectable to the first communication network and the second communication network, and connects to the first communication network if the reception level of the first communication network exceeds a threshold, In the handover method for connecting to the second communication network if the reception level of the first communication network is equal to or lower than the threshold, the first reception level of the first communication network is greater than the threshold during connection with the second communication network. When the period that exceeds the threshold value and does not fall below the second threshold value that is less than the threshold value continues for a predetermined period, the reception level of the first communication network is switched to the first communication network while connected to the first communication network. Is switched to the second communication network when the period that does not exceed the second threshold and does not exceed the first threshold continues for a predetermined period.

第４〜第６の発明のハンドオーバ方法において、第１の通信網と第２の通信網との間の切り替えは、通信中のトラヒックを監視し、当該トラヒックがない期間が所定期間継続したときに実行するようにしてもよい。   In the handover methods of the fourth to sixth inventions, the switching between the first communication network and the second communication network is performed when the traffic during communication is monitored and a period without the traffic continues for a predetermined period. You may make it perform.

第４〜第６の発明のハンドオーバ方法において、第１の通信網は無線ＬＡＮであり、第２の通信網は移動通信網である。   In the handover methods of the fourth to sixth inventions, the first communication network is a wireless LAN, and the second communication network is a mobile communication network.

本発明は、第２の通信網と接続中に、第１の通信網の受信レベルが閾値を超えたときにただちに第１の通信網に切り替えるのではなく、所定期間継続して当該閾値を超えたときに切り替える。また、第１の通信網と接続中に、第１の通信網の受信レベルが閾値以下になったときにただちに第２の通信網に切り替えるのではなく、所定期間継続して当該閾値以下になったときに切り替える。これにより、閾値を挟んで受信レベルが変動する状況でのハンドオーバは回避されるので、移動中でも通信が頻繁に途切れることもなく、安定したハンドオーバを実現することができる。   The present invention does not immediately switch to the first communication network when the reception level of the first communication network exceeds the threshold value while connecting to the second communication network, but continuously exceeds the threshold value for a predetermined period. Switch when In addition, when the reception level of the first communication network falls below the threshold during connection with the first communication network, it is not immediately switched to the second communication network, but continuously falls below the threshold for a predetermined period. Switch when Thus, handover in a situation where the reception level fluctuates across the threshold value is avoided, so that stable handover can be realized without frequent interruption of communication even during movement.

また、第１の通信網の受信レベルがハンドオーバの条件を満たしたときに、通信中のトラヒックがない期間が所定期間継続したことを確認してハンドオーバを実行することにより、通信が中断することを回避して安定したハンドオーバを実現することができる。   In addition, when the reception level of the first communication network satisfies the handover condition, it is confirmed that the period of no traffic during communication has continued for a predetermined period and the communication is interrupted by executing the handover. It is possible to avoid the stable handover.

本発明の無線通信装置の実施例１の構成例を示す図である。It is a figure which shows the structural example of Example 1 of the radio | wireless communication apparatus of this invention. 本発明のハンドオーバ方法の第１の処理手順例を示すフローチャートである。It is a flowchart which shows the 1st process sequence example of the hand-over method of this invention. 本発明のハンドオーバ方法の第１の処理手順例に対応する動作例を示す図である。It is a figure which shows the operation example corresponding to the 1st process sequence example of the hand-over method of this invention. 本発明のハンドオーバ方法の第２の処理手順例を示すフローチャートである。It is a flowchart which shows the 2nd process sequence example of the hand-over method of this invention. 本発明のハンドオーバ方法の第２，第３の処理手順例に対応する動作例を示す図である。It is a figure which shows the operation example corresponding to the 2nd, 3rd process sequence example of the hand-over method of this invention. 本発明のハンドオーバ方法の第３の処理手順例を示すフローチャートである。It is a flowchart which shows the 3rd process sequence example of the hand-over method of this invention. 本発明の無線通信装置の実施例２の構成例を示す図である。It is a figure which shows the structural example of Example 2 of the radio | wireless communication apparatus of this invention. 本発明のハンドオーバ方法の第４の処理手順例を示すフローチャートである。It is a flowchart which shows the 4th example of a process sequence of the hand-over method of this invention. 移動通信網と無線ＬＡＮの関係を示す図である。It is a figure which shows the relationship between a mobile communication network and wireless LAN.

図１は、本発明の無線通信装置の実施例１の構成例を示す。
図１において、無線通信装置は、無線ＬＡＮＩＦ部１１と、移動通信網ＩＦ部１２と、無線ＬＡＮＩＦ部１１に接続して無線ＬＡＮの受信レベル（ＲＳＳＩ）を検出する受信レベル検出部１３と、無線ＬＡＮのＲＳＳＩに応じて無線ＬＡＮと移動通信網のハンドオーバを制御する制御部１４と、制御部１４に接続してハンドオーバに係る時間計測を行うタイマ部１５とを備える。 FIG. 1 shows a configuration example of Embodiment 1 of a wireless communication apparatus of the present invention.
In FIG. 1, a wireless communication apparatus includes a wireless LAN IF unit 11, a mobile communication network IF unit 12, a reception level detection unit 13 that is connected to the wireless LAN IF unit 11 and detects a reception level (RSSI) of the wireless LAN, A control unit 14 that controls handover of the wireless LAN and the mobile communication network according to the RSSI of the LAN, and a timer unit 15 that is connected to the control unit 14 and performs time measurement related to the handover are provided.

なお、本構成は単体の無線端末装置であってもよいし、図１の構成において、さらに、制御部１４に接続されて無線端末との通信を行うＬＡＮ側の無線ＬＡＮＩＦを備え、このＬＡＮ側の無線ＬＡＮＩＦ部に接続される無線端末と無線ＬＡＮまたは移動通信網との中継機能を制御部１４が担い、ＷＡＮ側の通信機能部として、無線ＬＡＮＩＦ部１１または移動通信網ＩＦ部１２を使用する構成としてもよい。   This configuration may be a single wireless terminal device, or in the configuration of FIG. 1, further includes a LAN-side wireless LAN IF connected to the control unit 14 to communicate with the wireless terminal. The control unit 14 is responsible for the relay function between the wireless terminal connected to the wireless LANIF unit of the wireless LAN and the wireless LAN or the mobile communication network, and uses the wireless LANIF unit 11 or the mobile communication network IF unit 12 as the WAN communication function unit. It is good also as a structure.

図２は、本発明のハンドオーバ方法の第１の処理手順例を示す。
図２において、現在、無線ＬＡＮに接続しているか移動通信網に接続しているかを判断し（Ｓ０）、移動通信網に接続している場合には、受信レベル検出部１３で検出される無線ＬＡＮのＲＳＳＩが閾値を超えたか否かを判断する（Ｓ１）。ＲＳＳＩが閾値を超えた場合には、ただちに無線ＬＡＮへのハンドオーバを行うのではなく、タイマが起動していなければタイマを起動し（Ｓ２，Ｓ３）、タイマが起動していれば規定時間のタイマ満了になるまで（Ｓ４）、ＲＳＳＩの閾値判定Ｓ１を繰り返す。そして、ＲＳＳＩが閾値を超えてタイマ満了になったときに、無線ＬＡＮへのハンドオーバを行う（Ｓ５）。一方、ＲＳＳＩが閾値を超えていない状態、あるいはＲＳＳＩが閾値を超えた後にタイマ満了になるまでの間にＲＳＳＩが閾値以下になったときに、タイマが起動していればタイマをリセットし、タイマが起動していなければそのままＲＳＳＩの閾値判定Ｓ１に戻る（Ｓ６，Ｓ７）。 FIG. 2 shows a first processing procedure example of the handover method of the present invention.
In FIG. 2, it is determined whether it is currently connected to a wireless LAN or a mobile communication network (S0). If it is connected to a mobile communication network, the wireless level detected by the reception level detector 13 is detected. It is determined whether the RSSI of the LAN has exceeded a threshold value (S1). When the RSSI exceeds the threshold value, the handover to the wireless LAN is not performed immediately. If the timer is not activated, the timer is activated (S2, S3). If the timer is activated, the timer of the specified time is activated. Until the expiration (S4), RSSI threshold determination S1 is repeated. When the RSSI exceeds the threshold and the timer expires, a handover to the wireless LAN is performed (S5). On the other hand, if the RSSI is below the threshold value when the RSSI has not exceeded the threshold value or until the timer expires after the RSSI exceeds the threshold value, the timer is reset and the timer is reset. If is not activated, the process directly returns to the RSSI threshold determination S1 (S6, S7).

また、無線ＬＡＮに接続している場合には、受信レベル検出部１３で検出される無線ＬＡＮのＲＳＳＩが閾値以下か否かを判断する（Ｓ11）。ＲＳＳＩが閾値以下の場合には、ただちに移動通信網へのハンドオーバを行うのではなく、タイマが起動していなければタイマを起動し（Ｓ12，Ｓ13）、タイマが起動していれば規定時間のタイマ満了になるまで（Ｓ14）、ＲＳＳＩの閾値判定Ｓ11を繰り返す。そして、ＲＳＳＩが閾値以下でタイマ満了になったときに、移動通信網へのハンドオーバを行う（Ｓ15）。一方、ＲＳＳＩが閾値以下でない状態、あるいはＲＳＳＩが閾値以下になった後にタイマ満了になるまでの間にＲＳＳＩが閾値を超えたときに、タイマが起動していればタイマをリセットし、タイマが起動していなければそのままＲＳＳＩの閾値判定Ｓ11に戻る（Ｓ16，Ｓ17）。   If the wireless LAN is connected to the wireless LAN, it is determined whether or not the RSSI of the wireless LAN detected by the reception level detector 13 is equal to or less than a threshold (S11). When the RSSI is equal to or less than the threshold value, the handover to the mobile communication network is not performed immediately. If the timer is not started, the timer is started (S12, S13). Until it expires (S14), RSSI threshold determination S11 is repeated. When the timer expires when the RSSI is equal to or less than the threshold, a handover to the mobile communication network is performed (S15). On the other hand, if the RSSI is not below the threshold, or if the RSSI exceeds the threshold before the timer expires after the RSSI falls below the threshold, the timer is reset and the timer starts If not, the process directly returns to the RSSI threshold determination S11 (S16, S17).

図３は、本発明のハンドオーバ方法の第１の処理手順例に対応する動作例を示す。
図３(1) は従来のハンドオーバ方法の処理手順に対応し、ＲＳＳＩが閾値を挟んで上下するたびに、移動通信網と無線ＬＡＮとの間でハンドオーバが繰り返され、通信が途切れる。 FIG. 3 shows an operation example corresponding to the first processing procedure example of the handover method of the present invention.
FIG. 3 (1) corresponds to the processing procedure of the conventional handover method, and whenever the RSSI rises and falls across the threshold, the handover is repeated between the mobile communication network and the wireless LAN, and communication is interrupted.

図３(2) は本発明のハンドオーバ方法の第１の処理手順例に対応する。図中○は、ＲＳＳＩが閾値を超え、または閾値以下となってタイマが起動するタイミングを示す。図中×は、タイマが起動してからＲＳＳＩが閾値以下となり、または閾値以上となってタイマがリセットされるタイミングを示す。   FIG. 3 (2) corresponds to the first processing procedure example of the handover method of the present invention. In the figure, ○ indicates the timing when the timer starts when the RSSI exceeds the threshold value or is below the threshold value. In the figure, “X” indicates the timing at which the RSSI becomes equal to or lower than the threshold after the timer is started or is reset when the RSSI is equal to or higher than the threshold.

ＲＳＳＩが閾値を超える状態がタイマに設定される規定時間継続してから無線ＬＡＮに切り替える。また、ＲＳＳＩが閾値以下の状態がタイマに設定される規定時間継続してから移動通信網に切り替える。これにより、従来のようにＲＳＳＩが閾値を挟んで変動する場合にハンドオーバが頻繁に発生してその都度通信回線が切断される問題を回避し、安定したハンドオーバを実現することができる。   Switching to the wireless LAN is performed after a state in which the RSSI exceeds the threshold continues for a specified time set in the timer. In addition, switching to the mobile communication network is performed after a state in which the RSSI is equal to or less than a threshold value continues for a specified time set in the timer. Thereby, when RSSI fluctuates across the threshold as in the conventional case, it is possible to avoid the problem of frequent occurrence of handover and disconnection of the communication line each time, thereby realizing stable handover.

図４は、本発明のハンドオーバ方法の第２の処理手順例を示す。本処理手順例では、２つの閾値１，閾値２を用意し、移動通信網から無線ＬＡＮへのハンドオーバを判断する閾値１は、図２の第１の処理手順例の閾値より高くし、無線ＬＡＮから移動通信網へのハンドオーバを判断する閾値２は、図２の第１の処理手順例の閾値より低く設定する。すなわち、閾値１＞閾値２である。   FIG. 4 shows a second processing procedure example of the handover method of the present invention. In this processing procedure example, two threshold values 1 and 2 are prepared, and the threshold value 1 for determining handover from the mobile communication network to the wireless LAN is set higher than the threshold value of the first processing procedure example in FIG. The threshold value 2 for determining handover from the mobile communication network to the mobile communication network is set lower than the threshold value of the first processing procedure example in FIG. That is, threshold 1> threshold 2.

図４において、現在、無線ＬＡＮに接続しているか移動通信網に接続しているかを判断し（Ｓ０）、移動通信網に接続している場合には、受信レベル検出部１３で検出される無線ＬＡＮのＲＳＳＩが閾値１を超えたか否かを判断する（Ｓ21）。ＲＳＳＩが閾値１を超えた場合には、ただちに無線ＬＡＮへのハンドオーバを行うのではなく、タイマが起動していなければタイマを起動し（Ｓ22，Ｓ23）、タイマが起動していれば規定時間のタイマ満了になるまで（Ｓ24）、ＲＳＳＩの閾値判定Ｓ21を繰り返す。そして、ＲＳＳＩが閾値１を超えてタイマ満了になったときに、無線ＬＡＮへのハンドオーバを行う（Ｓ25）。一方、ＲＳＳＩが閾値１を超えていない状態、あるいはＲＳＳＩが閾値１を超えた後にタイマ満了になるまでの間にＲＳＳＩが閾値１以下になったときに、タイマが起動していればタイマをリセットし、タイマが起動していなければそのままＲＳＳＩの閾値判定Ｓ21に戻る（Ｓ26，Ｓ27）。   In FIG. 4, it is determined whether it is currently connected to a wireless LAN or a mobile communication network (S0). If it is connected to a mobile communication network, the wireless level detected by the reception level detector 13 is detected. It is determined whether the RSSI of the LAN has exceeded a threshold value 1 (S21). When the RSSI exceeds the threshold value 1, a handover to the wireless LAN is not performed immediately. If the timer is not activated, the timer is activated (S22, S23). If the timer is activated, the specified time is reached. Until the timer expires (S24), RSSI threshold determination S21 is repeated. Then, when the RSSI exceeds the threshold 1 and the timer expires, a handover to the wireless LAN is performed (S25). On the other hand, if the RSSI is below the threshold 1 when the RSSI is below the threshold 1, or when the RSSI is below the threshold 1 after the RSSI exceeds the threshold 1, the timer is reset. If the timer is not started, the process directly returns to the RSSI threshold determination S21 (S26, S27).

また、無線ＬＡＮに接続している場合には、受信レベル検出部１３で検出される無線ＬＡＮのＲＳＳＩが閾値２以下か否かを判断する（Ｓ31）。ＲＳＳＩが閾値２以下の場合には、ただちに移動通信網へのハンドオーバを行うのではなく、タイマが起動していなければタイマを起動し（Ｓ32，Ｓ33）、タイマが起動していれば規定時間のタイマ満了になるまで（Ｓ34）、ＲＳＳＩの閾値判定Ｓ31を繰り返す。そして、ＲＳＳＩが閾値２以下でタイマ満了になったときに、移動通信網へのハンドオーバを行う（Ｓ35）。一方、ＲＳＳＩが閾値２以下でない状態、あるいはＲＳＳＩが閾値２以下になった後にタイマ満了になるまでの間にＲＳＳＩが閾値２を超えたときに、タイマが起動していればタイマをリセットし、タイマが起動していなければそのままＲＳＳＩの閾値判定Ｓ31に戻る（Ｓ36，Ｓ37）。   If the wireless LAN is connected to the wireless LAN, it is determined whether or not the RSSI of the wireless LAN detected by the reception level detector 13 is equal to or less than the threshold 2 (S31). If the RSSI is less than or equal to the threshold value 2, a handover to the mobile communication network is not performed immediately. If the timer is not started, the timer is started (S32, S33). If the timer is started, the specified time is reached. Until the timer expires (S34), RSSI threshold determination S31 is repeated. Then, when the timer expires when the RSSI is equal to or less than the threshold value 2, a handover to the mobile communication network is performed (S35). On the other hand, when the RSSI exceeds the threshold 2 when the RSSI is not less than the threshold 2 or when the RSSI exceeds the threshold 2 after the RSSI becomes the threshold 2 or less, the timer is reset, If the timer has not been started, the process directly returns to the RSSI threshold determination S31 (S36, S37).

図５(1) は、本発明のハンドオーバ方法の第２の処理手順例に対応する動作例を示す。図中○は、ＲＳＳＩが閾値１を超え、または閾値２以下となってタイマが起動するタイミングを示す。図中×は、タイマが起動してからＲＳＳＩが閾値１以下となり、また閾値２以上となってタイマがリセットされるタイミングを示す。   FIG. 5 (1) shows an operation example corresponding to the second processing procedure example of the handover method of the present invention. In the figure, ○ indicates the timing when the timer starts when the RSSI exceeds the threshold 1 or is equal to or less than the threshold 2. In the figure, “X” indicates the timing at which the RSSI becomes equal to or lower than the threshold value 1 after the timer is started and is reset to become equal to or higher than the threshold value 2.

ここでは、ＲＳＳＩがある程度上がり、閾値１を超える状態がタイマに設定される規定時間継続してから無線ＬＡＮに切り替える。また、ＲＳＳＩがある程度下がり、閾値２以下の状態がタイマに設定される規定時間継続してから移動通信網に切り替える。これにより、図２および図３に示す第１の処理手順例に比べて、ＲＳＳＩが閾値を挟んで変動することによりタイマがオンオフする回数が減り、安定したハンドオーバを実現することができる。   Here, the RSSI rises to some extent, and the state of exceeding the threshold value 1 continues for a specified time set in the timer, and then the wireless LAN is switched to. Further, the RSSI is lowered to some extent, and the state of the threshold value 2 or less continues for a specified time set in the timer, and then the mobile communication network is switched. As a result, compared to the first processing procedure example shown in FIGS. 2 and 3, the number of times the timer is turned on and off is reduced when the RSSI fluctuates across the threshold, and stable handover can be realized.

図６は、本発明のハンドオーバ方法の第３の処理手順例を示す。本処理手順例では、図４および図５に示す第２の処理手順例と同様の２つの閾値１，閾値２（閾値１＞閾値２）を用意するが、タイマのリセットタイミングを規定する閾値を変更する。   FIG. 6 shows a third processing procedure example of the handover method of the present invention. In this processing procedure example, two threshold values 1 and 2 (threshold value 1> threshold value 2) similar to those in the second processing procedure example shown in FIGS. 4 and 5 are prepared. change.

図６において、現在、無線ＬＡＮに接続しているか移動通信網に接続しているかを判断し（Ｓ０）、移動通信網に接続している場合には、閾値を閾値１とし、受信レベル検出部１３で検出される無線ＬＡＮのＲＳＳＩが閾値１を超えたか否かを判断する（Ｓ41）。ＲＳＳＩが閾値１を超えた場合には、ただちに無線ＬＡＮへのハンドオーバを行うのではなく、閾値を閾値２とし、タイマが起動していなければタイマを起動し（Ｓ42，Ｓ43）、タイマが起動していれば規定時間のタイマ満了になるまで（Ｓ44）、ＲＳＳＩの閾値判定Ｓ41を繰り返す。このとき、ＲＳＳＩを判定する閾値は閾値１から閾値２に変更になっている。そして、ＲＳＳＩが閾値１を超え、かつ閾値２以下にならずにタイマ満了になったときに、無線ＬＡＮへのハンドオーバを行う（Ｓ45）。一方、ＲＳＳＩが閾値１を超えていない状態、あるいはＲＳＳＩが閾値１を超えた後にタイマ満了になるまでの間にＲＳＳＩが閾値２以下になったときに、閾値を閾値１とし、タイマが起動していればタイマをリセットし、タイマが起動していなければそのままＲＳＳＩの閾値判定Ｓ41に戻る（Ｓ46，Ｓ47）。   In FIG. 6, it is determined whether it is currently connected to a wireless LAN or a mobile communication network (S0). If it is connected to a mobile communication network, the threshold is set to threshold 1 and a reception level detector It is determined whether or not the RSSI of the wireless LAN detected at 13 exceeds a threshold value 1 (S41). When the RSSI exceeds the threshold value 1, the handover to the wireless LAN is not performed immediately, but the threshold value is set to the threshold value 2. If the timer is not activated, the timer is activated (S42, S43), and the timer is activated. If so, the RSSI threshold determination S41 is repeated until the timer for the specified time expires (S44). At this time, the threshold for judging RSSI is changed from threshold 1 to threshold 2. When the RSSI exceeds the threshold value 1 and does not become the threshold value 2 or less and the timer expires, a handover to the wireless LAN is performed (S45). On the other hand, when the RSSI does not exceed the threshold value 1 or when the RSSI becomes equal to or less than the threshold value 2 after the RSSI exceeds the threshold value 1 and before the timer expires, the threshold value is set to the threshold value 1 and the timer starts. If so, the timer is reset. If the timer has not been started, the process directly returns to the RSSI threshold determination S41 (S46, S47).

また、無線ＬＡＮに接続している場合には、閾値を閾値２とし、受信レベル検出部１３で検出される無線ＬＡＮのＲＳＳＩが閾値２以下か否かを判断する（Ｓ51）。ＲＳＳＩが閾値２以下の場合には、ただちに移動通信網へのハンドオーバを行うのではなく、閾値を閾値１とし、タイマが起動していなければタイマを起動し（Ｓ52，Ｓ53）、タイマが起動していれば規定時間のタイマ満了になるまで（Ｓ54）、ＲＳＳＩの閾値判定Ｓ51を繰り返す。このとき、ＲＳＳＩを判定する閾値は閾値２から閾値１に変更になっている。そして、ＲＳＳＩが閾値２以下となり、かつ閾値１を超えずにタイマ満了になったときに、移動通信網へのハンドオーバを行う（Ｓ55）。一方、ＲＳＳＩが閾値２以下でない状態、あるいはＲＳＳＩが閾値２以下となった後にタイマ満了になるまでの間にＲＳＳＩが閾値１を超えたときに、タイマが起動していればタイマをリセットし、タイマが起動していなければそのままＲＳＳＩの閾値判定Ｓ51に戻る（Ｓ56，Ｓ57）。   If the wireless LAN is connected, the threshold value is set to the threshold value 2, and it is determined whether or not the RSSI of the wireless LAN detected by the reception level detection unit 13 is equal to or less than the threshold value 2 (S51). If the RSSI is less than or equal to the threshold value 2, the handover to the mobile communication network is not performed immediately, but the threshold value is set to the threshold value 1. If the timer is not activated, the timer is activated (S52, S53). If so, the RSSI threshold determination S51 is repeated until the timer for the specified time expires (S54). At this time, the threshold for determining RSSI is changed from threshold 2 to threshold 1. Then, when the RSSI is equal to or less than the threshold value 2 and the timer expires without exceeding the threshold value 1, a handover to the mobile communication network is performed (S55). On the other hand, when the RSSI exceeds the threshold 1 after the RSSI is not less than the threshold 2 or when the RSSI exceeds the threshold 2 and before the timer expires, the timer is reset if the timer is activated. If the timer has not been started, the process directly returns to the RSSI threshold determination S51 (S56, S57).

図５(2) は、本発明のハンドオーバ方法の第３の処理手順例に対応する動作例を示す。図中○は、ＲＳＳＩが閾値１を超え、または閾値２以下となってタイマが起動するタイミングを示す。また、ＲＳＳＩが閾値１を超え、タイマが起動してからＲＳＳＩが閾値２以下となるタイミング、またＲＳＳＩが閾値２以下となり、タイマが起動してからＲＳＳＩが閾値１を超えるタイミングで、それぞれタイマがリセットされる。   FIG. 5 (2) shows an operation example corresponding to the third processing procedure example of the handover method of the present invention. In the figure, ○ indicates the timing when the timer starts when the RSSI exceeds the threshold 1 or is equal to or less than the threshold 2. In addition, when the RSSI exceeds the threshold 1 and the timer starts, the RSSI becomes the threshold 2 or less, or when the RSSI becomes the threshold 2 or less and the RSSI exceeds the threshold 1 after the timer starts, Reset.

ここでは、ＲＳＳＩがある程度上がり、閾値１を超え、かつ閾値２以下にならない状態がタイマに設定される規定時間継続してから無線ＬＡＮに切り替える。すなわち、ＲＳＳＩが閾値２まで下がらない限り、タイマはリセットされない。また、ＲＳＳＩがある程度下がり、閾値２以下になり、かつ閾値１を超えない状態がタイマに設定される規定時間継続してから移動通信網に切り替える。すなわち、ＲＳＳＩが閾値１を超えない限り、タイマはリセットされない。これにより、図４および図５(1) に示す第２の処理手順例に比べて、ＲＳＳＩが閾値１，２を挟んで変動することによりタイマがオンオフする回数が減り、迅速かつ安定したハンドオーバを実現することができる。   Here, the RSSI rises to some extent, the state where the threshold value 1 is exceeded and the threshold value 2 is not less than 2 continues for a specified time set in the timer, and then the wireless LAN is switched to. That is, the timer is not reset unless RSSI falls to threshold value 2. In addition, the RSSI is lowered to some extent, becomes less than or equal to the threshold value 2 and does not exceed the threshold value 1 for a predetermined time set in the timer, and then switches to the mobile communication network. In other words, the timer is not reset unless RSSI exceeds threshold value 1. As a result, compared to the second processing procedure example shown in FIG. 4 and FIG. 5 (1), the number of times the timer is turned on / off is reduced because the RSSI fluctuates between the threshold values 1 and 2, and a quick and stable handover is achieved. Can be realized.

図７は、本発明の無線通信装置の実施例２の構成例を示す。
図７において、無線通信装置は、無線ＬＡＮＩＦ部１１と、移動通信網ＩＦ部１２と、無線ＬＡＮＩＦ部１１に接続して無線ＬＡＮの受信レベル（ＲＳＳＩ）を検出する受信レベル検出部１３と、無線ＬＡＮのＲＳＳＩに応じて無線ＬＡＮと移動通信網のハンドオーバを制御する制御部１４と、制御部１４に接続してハンドオーバに係る時間計測を行うタイマ部１５と、制御部１４を介して無線ＬＡＮＩＦ部１１または移動通信網ＩＦ部１２との間で送受信データを入出力するデータ入出力部１６と、制御部１４およびデータ入出力部１６に接続して無通信期間を測定し、ハンドオーバを制御する無通信期間測定部１７を備える。 FIG. 7 shows a configuration example of Embodiment 2 of the wireless communication apparatus of the present invention.
In FIG. 7, the wireless communication apparatus includes a wireless LAN IF unit 11, a mobile communication network IF unit 12, a reception level detection unit 13 that is connected to the wireless LAN IF unit 11 and detects a reception level (RSSI) of the wireless LAN, A control unit 14 that controls handover of the wireless LAN and the mobile communication network in accordance with the RSSI of the LAN, a timer unit 15 that is connected to the control unit 14 and measures time for handover, and a wireless LAN IF unit via the control unit 14 11 or the data input / output unit 16 for inputting / outputting transmission / reception data to / from the mobile communication network IF unit 12, and the control unit 14 and the data input / output unit 16 are connected to measure the non-communication period and control the handover. A communication period measurement unit 17 is provided.

なお、本構成は単体の無線端末装置であってもよいし、無線中継装置のＷＡＮ側の通信機能部とし、ＬＡＮ側に無線ＬＡＮＩＦ部を備え、このＬＡＮ側の無線ＬＡＮＩＦ部に接続される無線端末と無線ＬＡＮまたは携帯電話網との中継機能を制御部１４およびデータ入出力部１６が担う構成としてもよい。   This configuration may be a single wireless terminal device or a wireless communication device on the WAN side of the wireless relay device, a wireless LANIF unit on the LAN side, and a wireless connected to the wireless LANIF unit on the LAN side. The control unit 14 and the data input / output unit 16 may be configured to perform a relay function between the terminal and the wireless LAN or the mobile phone network.

図８は、本発明のハンドオーバ方法の第４の処理手順例を示す。
図８において、現在、無線ＬＡＮに接続しているか移動通信網に接続しているかを判断し（Ｓ０）、移動通信網に接続している場合には、受信レベル検出部１３で検出される無線ＬＡＮのＲＳＳＩが閾値を超えたか否かを判断する（Ｓ61）。ここで、ＲＳＳＩが閾値を超えていなければ、ＲＳＳＩの閾値判定Ｓ61に戻る。一方、ＲＳＳＩが閾値を超えた場合には、ただちに無線ＬＡＮへのハンドオーバを行うのではなく、無通信期間測定部１７によってデータ通信のトラヒックの有無を測定し、無通信期間がタイマ満了まで継続したか否かを判定する（Ｓ62）。ここで、無通信期間満了までにデータ通信のトラヒックがあれば、ＲＳＳＩの閾値判定Ｓ61に戻る。一方、無通信期間満了までにデータ通信のトラヒックがなければ、無線ＬＡＮへのハンドオーバを行うための無線ＬＡＮ基地局（ＡＰ）を探索し（Ｓ63）、無線ＬＡＮ基地局が見つかれば接続処理を行う（Ｓ64）。次に、再度データ通信のトラヒックの有無を検出し、無通信状態が継続しているか否かを判定する（Ｓ65）。ここで、無線ＬＡＮ基地局の探索中に新たなトラヒックが検出されれば、ハンドオーバを行うことなくＲＳＳＩの閾値判定Ｓ61に戻る。一方、新たなトラヒックが検出されなければ、無線ＬＡＮへのハンドオーバを行う（Ｓ66）。 FIG. 8 shows a fourth processing procedure example of the handover method of the present invention.
In FIG. 8, whether it is currently connected to a wireless LAN or a mobile communication network is determined (S0). If it is connected to a mobile communication network, the wireless level detected by the reception level detector 13 is detected. It is determined whether the RSSI of the LAN has exceeded a threshold value (S61). If the RSSI does not exceed the threshold, the process returns to RSSI threshold determination S61. On the other hand, when the RSSI exceeds the threshold value, instead of immediately performing handover to the wireless LAN, the non-communication period measurement unit 17 measures the presence or absence of data communication traffic, and the non-communication period continues until the timer expires. It is determined whether or not (S62). If there is data communication traffic before the no-communication period expires, the process returns to RSSI threshold determination S61. On the other hand, if there is no data communication traffic before the end of the no-communication period, a wireless LAN base station (AP) for performing handover to the wireless LAN is searched (S63), and if a wireless LAN base station is found, connection processing is performed. (S64). Next, the presence / absence of data communication traffic is detected again to determine whether or not the no-communication state continues (S65). If new traffic is detected during the search for the wireless LAN base station, the process returns to the RSSI threshold determination S61 without performing a handover. On the other hand, if no new traffic is detected, a handover to the wireless LAN is performed (S66).

なお、移動通信網に接続しているときに、無線ＬＡＮＩＦ部１１をバックグラウンドで起動し、無線ＬＡＮ基地局を探索して接続処理を行っておき、ＲＳＳＩが閾値を超えたときに、無通信期間満了を確認して無線ＬＡＮへのハンドオーバを行うようにしてもよい。   When connected to the mobile communication network, the wireless LAN IF unit 11 is activated in the background, the wireless LAN base station is searched for connection processing, and no communication is performed when the RSSI exceeds a threshold value. You may make it perform the hand-over to wireless LAN, confirming expiration of a period.

また、無線ＬＡＮに接続している場合には、受信レベル検出部１３で検出される無線ＬＡＮのＲＳＳＩが閾値以下か否かを判断する（Ｓ71）。ここで、ＲＳＳＩが閾値以下でなければ、ＲＳＳＩの閾値判定Ｓ71に戻る。一方、ＲＳＳＩが閾値以下の場合には、ただちに移動通信網へのハンドオーバを行うのではなく、無通信期間測定部１７によってデータ通信のトラヒックの有無を測定し、無通信期間がタイマ満了まで継続したか否かを判定する（Ｓ72）。ここで、無通信期間満了までにデータ通信のトラヒックがあれば、ＲＳＳＩの閾値判定Ｓ71に戻る。一方、所定期間中にデータ通信のトラヒックがなければ、移動通信網へのハンドオーバを行う（Ｓ73）。   If the wireless LAN is connected, it is determined whether the RSSI of the wireless LAN detected by the reception level detector 13 is equal to or less than a threshold (S71). If the RSSI is not less than or equal to the threshold, the process returns to RSSI threshold determination S71. On the other hand, when the RSSI is equal to or less than the threshold value, the handover to the mobile communication network is not performed immediately, but the presence / absence of data communication traffic is measured by the no-communication period measurement unit 17 and the no-communication period continues until the timer expires. It is determined whether or not (S72). If there is data communication traffic before the no-communication period expires, the process returns to RSSI threshold determination S71. On the other hand, if there is no data communication traffic during the predetermined period, handover to the mobile communication network is performed (S73).

なお、ここではＲＳＳＩと閾値判定は従来の手法を用いたが、上記の第１〜第３の処理手順例を用いてＲＳＳＩの閾値判定を行ってもよい。   In addition, although the conventional method was used for RSSI and threshold determination here, RSSI threshold determination may be performed using the above first to third processing procedure examples.

１１ 無線ＬＡＮＩＦ部
１２ 移動通信網ＩＦ部
１３ 受信レベル検出部
１４ 制御部
１５ タイマ部
１６ データ入出力部
１７ 無通信期間測定部 DESCRIPTION OF SYMBOLS 11 Wireless LANIF part 12 Mobile communication network IF part 13 Reception level detection part 14 Control part 15 Timer part 16 Data input / output part 17 No communication period measurement part

Claims (10)

第１の通信網と第２の通信網に接続可能であり、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続する無線通信装置において、
前記第２の通信網と接続中に、前記第１の通信網の受信レベルが所定期間継続して前記閾値を超えたときに前記第１の通信網に切り替え、前記第１の通信網と接続中に、前記第１の通信網の受信レベルが所定期間継続して前記の閾値以下のときに前記第２の通信網に切り替える手段を備えた
ことを特徴とする無線通信装置。 The first communication network can be connected to the second communication network, and if the reception level of the first communication network exceeds the threshold value, the first communication network is connected, and the reception level of the first communication network is equal to or lower than the threshold value. In the wireless communication device connected to the second communication network,
During connection with the second communication network, when the reception level of the first communication network continues for a predetermined period and exceeds the threshold value, switching to the first communication network and connection with the first communication network The wireless communication apparatus further comprises means for switching to the second communication network when the reception level of the first communication network is continuously below the threshold value for a predetermined period. 第１の通信網と第２の通信網に接続可能であり、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続する無線通信装置において、
前記第２の通信網と接続中に、前記第１の通信網の受信レベルが所定期間継続して前記閾値より大きい第１の閾値を超えたときに前記第１の通信網に切り替え、前記第１の通信網と接続中に、前記第１の通信網の受信レベルが所定期間継続して前記閾値より小さい第２の閾値以下のときに前記第２の通信網に切り替える手段を備えた
ことを特徴とする無線通信装置。 The first communication network can be connected to the second communication network, and if the reception level of the first communication network exceeds the threshold value, the first communication network is connected, and the reception level of the first communication network is equal to or lower than the threshold value. In the wireless communication device connected to the second communication network,
Switching to the first communication network when the reception level of the first communication network continuously exceeds a first threshold value greater than the threshold value during a predetermined period while connected to the second communication network; Means for switching to the second communication network when the reception level of the first communication network continues for a predetermined period and is below a second threshold value smaller than the threshold value while connected to the first communication network. A wireless communication device. 第１の通信網と第２の通信網に接続可能であり、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続する無線通信装置において、
前記第２の通信網と接続中に、前記第１の通信網の受信レベルが前記閾値より大きい第１の閾値を超え、かつ前記閾値より小さい第２の閾値以下にならない期間が所定期間継続したときに前記第１の通信網に切り替え、前記第１の通信網と接続中に、前記第１の通信網の受信レベルが前記第２の閾値以下となり、かつ前記第１の閾値を超えない期間が所定期間継続したときに前記第２の通信網に切り替える手段を備えた
ことを特徴とする無線通信装置。 The first communication network can be connected to the second communication network, and if the reception level of the first communication network exceeds the threshold value, the first communication network is connected, and the reception level of the first communication network is equal to or lower than the threshold value. In the wireless communication device connected to the second communication network,
During the connection with the second communication network, a period during which the reception level of the first communication network exceeds the first threshold value greater than the threshold value and does not fall below the second threshold value less than the threshold value continues for a predetermined period. When switching to the first communication network and connecting to the first communication network, a period during which the reception level of the first communication network is less than or equal to the second threshold and does not exceed the first threshold A wireless communication apparatus comprising: means for switching to the second communication network when is continued for a predetermined period. 請求項１〜３のいずれかに記載の無線通信装置において、
前記第１の通信網と前記第２の通信網との間の切り替えは、通信中のトラヒックを監視し、当該トラヒックがない期間が所定期間継続したときに実行する手段を備えた
ことを特徴とする無線通信装置。 In the radio | wireless communication apparatus in any one of Claims 1-3,
The switching between the first communication network and the second communication network includes means for monitoring traffic during communication and executing when a period of no traffic continues for a predetermined period. Wireless communication device. 請求項１〜３のいずれかに記載の無線通信装置において、
前記第１の通信網は無線ＬＡＮであり、前記第２の通信網は移動通信網であることを特徴とする無線通信装置。 In the radio | wireless communication apparatus in any one of Claims 1-3,
The wireless communication apparatus, wherein the first communication network is a wireless LAN, and the second communication network is a mobile communication network. 第１の通信網と第２の通信網に接続可能な無線通信装置であって、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続するハンドオーバ方法において、
前記第２の通信網と接続中に、前記第１の通信網の受信レベルが所定期間継続して前記閾値を超えたときに前記第１の通信網に切り替え、
前記第１の通信網と接続中に、前記第１の通信網の受信レベルが所定期間継続して前記の閾値以下のときに前記第２の通信網に切り替える
ことを特徴とするハンドオーバ方法。 A wireless communication apparatus connectable to a first communication network and a second communication network, wherein if the reception level of the first communication network exceeds a threshold value, the first communication network is connected. In the handover method for connecting to the second communication network if the reception level is below the threshold,
During connection with the second communication network, when the reception level of the first communication network continuously exceeds the threshold for a predetermined period, switching to the first communication network,
A handover method comprising switching to the second communication network when the reception level of the first communication network continues for a predetermined period and stays below the threshold during connection with the first communication network. 第１の通信網と第２の通信網に接続可能な無線通信装置であって、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続するハンドオーバ方法において、
前記第２の通信網と接続中に、前記第１の通信網の受信レベルが所定期間継続して前記閾値より大きい第１の閾値を超えたときに前記第１の通信網に切り替え、
前記第１の通信網と接続中に、前記第１の通信網の受信レベルが所定期間継続して前記閾値より小さい第２の閾値以下のときに前記第２の通信網に切り替える
ことを特徴とするハンドオーバ方法。 A wireless communication apparatus connectable to a first communication network and a second communication network, wherein if the reception level of the first communication network exceeds a threshold value, the first communication network is connected. In the handover method for connecting to the second communication network if the reception level is below the threshold,
Switching to the first communication network when the reception level of the first communication network continuously exceeds a first threshold value greater than the threshold value while connected to the second communication network;
Switching to the second communication network when the reception level of the first communication network continues for a predetermined period and is equal to or lower than a second threshold value smaller than the threshold value while being connected to the first communication network. Handover method. 第１の通信網と第２の通信網に接続可能な無線通信装置であって、第１の通信網の受信レベルが閾値を超えれば第１の通信網に接続し、第１の通信網の受信レベルが閾値以下になれば第２の通信網に接続するハンドオーバ方法において、
前記第２の通信網と接続中に、前記第１の通信網の受信レベルが前記閾値より大きい第１の閾値を超え、かつ前記閾値より小さい第２の閾値以下にならない期間が所定期間継続したときに前記第１の通信網に切り替え、
前記第１の通信網と接続中に、前記第１の通信網の受信レベルが前記第２の閾値以下となり、かつ前記第１の閾値を超えない期間が所定期間継続したときに前記第２の通信網に切り替える
ことを特徴とするハンドオーバ方法。 A wireless communication apparatus connectable to a first communication network and a second communication network, wherein if the reception level of the first communication network exceeds a threshold value, the first communication network is connected. In the handover method for connecting to the second communication network if the reception level is below the threshold,
During the connection with the second communication network, a period during which the reception level of the first communication network exceeds the first threshold value greater than the threshold value and does not fall below the second threshold value less than the threshold value continues for a predetermined period. Sometimes switch to the first communication network,
During the connection with the first communication network, when the reception level of the first communication network is equal to or lower than the second threshold and the period not exceeding the first threshold continues for a predetermined period, the second A handover method characterized by switching to a communication network. 請求項６〜８のいずれかに記載のハンドオーバ方法において、
前記第１の通信網と前記第２の通信網との間の切り替えは、通信中のトラヒックを監視し、当該トラヒックがない期間が所定期間継続したときに実行する
ことを特徴とするハンドオーバ方法。 In the handover method according to any one of claims 6 to 8,
Switching between the first communication network and the second communication network is performed when a traffic during communication is monitored and a period of no traffic continues for a predetermined period. 請求項６〜８のいずれかに記載のハンドオーバ方法において、
前記第１の通信網は無線ＬＡＮであり、前記第２の通信網は移動通信網であることを特徴とするハンドオーバ方法。 In the handover method according to any one of claims 6 to 8,
The handover method, wherein the first communication network is a wireless LAN and the second communication network is a mobile communication network.
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