WO2010110114A1 - 無線通信システムおよび親ノード探索方法 - Google Patents
無線通信システムおよび親ノード探索方法 Download PDFInfo
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- H04W8/005—Discovery of network devices, e.g. terminals
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- the present invention relates to a wireless communication system including a parent node that is a higher-level communication device and a child node that is a lower-level communication device, and more particularly to a technique for selecting a parent node with which a child node regularly communicates.
- FIG. 8 is a block diagram showing a configuration of a conventional wireless measurement system using such a wireless communication function.
- the wireless measurement system generally includes an information processing device 101 that is a parent node such as a relay node or a gateway node, and a wireless communication device 102 that is a terminal leaf node (child node). Data wirelessly transmitted from the wireless communication device 102 is accumulated in the database 103 through the information processing device 101.
- the wireless communication device 102 is a node at the end of the network, and the number of times of communication is smaller than that of the information processing device 101. Therefore, the power consumption is smaller than that of the information processing apparatus 101. In addition, it is desired to eliminate the power supply line at the same time as the signal line for the wireless measuring device. Therefore, the wireless communication device 102 is often configured to use a battery as a power source.
- FIG. 9 is a diagram illustrating a specific example of the wireless communication device 102. In FIG. 9, in the example of (A), the sensor 104 and the battery type wireless communication device 102a are separated. In the example of (B), the wireless communication device is a sensor-integrated battery type wireless communication device 102b having a sensor inside. Thus, the wireless communication device 102 often uses a battery as a power source. For this reason, there is a restriction on the operable time.
- each parent node when there are a plurality of parent node candidates, when a search signal for searching for a parent node capable of communication is sent from a leaf node, each parent node returns a response in response to the search signal.
- a leaf node selects a parent node that responds quickly and establishes a relationship for regular communication.
- the leaf node when the direct connection with the parent node becomes impossible, the leaf node does not cancel the regular communication relationship with the parent node, and does not cancel the relationship with the parent node through a detour route via another node. Continue communication.
- the present invention has been made in order to solve the above-described problem.
- the wireless communication system and the parent can reduce the probability that the battery life of the child node will be shortened unexpectedly.
- the object is to provide a node search method.
- the wireless communication system of the present invention includes a parent node that is a higher-level communication device and a child node that is a lower-level communication device, and the parent node receives a parent node search signal transmitted from the child node.
- Measuring means for measuring the strength of the radio link between the parent node search signal receiving means and the child node that has transmitted the parent node search signal when the parent node search signal is received; and the strength of the radio link
- a reply means for returning a response signal to a child node that is a transmission source of the parent node search signal after waiting for a reply waiting time according to the transmission, wherein the child node transmits the parent node search signal.
- a response signal receiving means for receiving the response signal, and a parent node that constantly communicates with its own node based on a waiting time from when the parent node search signal is transmitted until the response signal is received Is characterized in further comprising a parent node selecting means for selecting.
- the parent node further decreases the reply waiting time as the wireless link is stronger, and increases the reply waiting time as the wireless link is weaker.
- the reply means of the parent node minimizes the reply waiting time when the strength of the wireless link is greater than or equal to a threshold.
- the processing is terminated without returning the response signal, and the parent node selection means of the child node returns the response signal. It is characterized by selecting the parent node that has returned the fastest.
- the threshold value is a specified value.
- the transmission means of the child node transmits the threshold to the parent node together with the parent node search signal, and the child node further includes the parent node search signal.
- the threshold value is changed to a value smaller than the current value, and the transmission means retransmits the parent node search signal and the changed threshold value.
- a threshold value changing means to be executed.
- the measuring means measures RSSI as an index representing the strength of the wireless link.
- the parent node search method of the present invention includes a transmission procedure in which a child node as a lower communication device transmits a parent node search signal, and a parent node search in which a parent node as a higher communication device is transmitted from the child node.
- a parent node search signal reception procedure for receiving a signal and the parent node receives the parent node search signal, the strength of the radio link between the parent node search signal and the child node that transmitted the parent node search signal is measured.
- a measurement procedure a reply procedure in which a response signal is returned to a child node that is a transmission source of the parent node search signal after the parent node waits for a reply waiting time corresponding to the strength of the radio link, and the child node Is based on a response signal reception procedure for receiving the response signal and a waiting time until the child node receives the response signal after transmitting the parent node search signal. It is characterized in further comprising a parent node selection procedure for selecting a parent node to communicate.
- the strength of the radio link is measured by measuring the strength of the radio link with the child node that transmitted the parent node search signal. After waiting for a reply waiting time corresponding to the response time, the response signal is returned to the child node that is the transmission source of the parent node search signal, and the child node waits until the response signal is received after the parent node search signal is transmitted. Therefore, the child node can select the parent node in consideration of the stability of communication. As a result, in the present invention, it is possible to reduce the probability that re-communication will increase, and it is possible to reduce the probability that the battery life of the child node will be shortened unexpectedly. In the present invention, the search processing load on the child node side can be reduced.
- the inventor determines the strength of the link with the child node (RSSI (Received Signal Strength). Indicator): A numerical value indicating the strength of the received signal), the parent node may change the reply waiting time, more specifically, the stronger the link strength, the faster the reply, the weaker the reply I came up with the idea to make it happen. Since the child node can know the rank of the strength of the link with the parent node according to the reply order, the parent node can be selected in consideration of communication stability. That is, the child node may select the parent node that has returned the fastest. By such a method, the search processing load on the child node side can be reduced.
- RSSI Receiveived Signal Strength
- a parent node having a link strength (RSSI) with a child node that is equal to or greater than a threshold needs to reply at the fastest speed, that is, a link having a link strength that is equal to or greater than the threshold needs to be answered quickly.
- the child node is a node whose link strength with its own node is higher than a specific strength, and it can know which of the nodes can communicate in the shortest time.
- a parent node can be selected in consideration of both stability of communication and speed of communication. That is, the child node may select the parent node that has returned the fastest.
- FIG. 1 is a block diagram showing a configuration of a radio communication system according to the first embodiment of the present invention. This embodiment is based on the first principle of the invention.
- the wireless communication system includes a parent node 1 that is a higher-level communication device and a child node (leaf node) 2 that is a lower-level communication device such as a sensor device that transmits measurement data to the parent node 1, for example.
- the parent node 1 includes a signal receiving unit 10 that receives a signal from the child node 2 via a wireless link, and the child node 2 that has transmitted the parent node search signal when the parent node search signal is received from the child node 2.
- RSSI measuring unit 11 that measures RSSI that is an index representing the strength of the wireless link between the wireless link
- reply waiting time determining unit 12 that determines the reply waiting time according to the strength of the wireless link, and the strength of the wireless link
- a reply waiting time waiting processing unit 13 After waiting for a reply waiting time according to the response time, a reply waiting time waiting processing unit 13 that sends back a response signal to the child node 2 that is the transmission source of the parent node search signal, and a signal is transmitted to the child node 2 via the wireless link.
- a signal transmission unit 14 The reply waiting time waiting processing unit 13 and the signal transmitting unit 14 constitute reply means for returning a response signal.
- the child node 2 transmits a signal transmitting unit 20 that transmits a signal to the parent node 1 via a wireless link, a signal receiving unit 21 that receives a signal from the parent node 1 via a wireless link, and a parent node search signal. Based on the waiting time until the response signal is received, a parent node selection unit 22 that selects a parent node that constantly communicates with the own node, and the address of the parent node 1 selected by the parent node selection unit 22 are stored. And a battery 24 that supplies power to each component of the child node 2.
- the signal transmission unit 20 of the child node 2 acquires measurement data from the sensor unit (not shown) for each operation cycle, and acquires the measurement. Data is transmitted to the parent node 1 via the wireless link.
- the signal receiving unit 10 of the parent node 1 receives data from the child node 2 via the wireless link, the signal receiving unit 10 stores this data in a database (not shown). Data stored in the database is processed as needed.
- the parent node 1 is a control device, for example, the parent node 1 performs temperature control, humidity control, flow rate control, and the like based on data (state quantity) received from the child node 2.
- FIG. 2 is a flowchart showing the operation of the child node 2
- FIG. 3 is a flowchart showing the operation of the parent node 1.
- the parent node selection unit 22 of the child node 2 that wants to search for the parent node 1 that regularly communicates causes the signal transmission unit 20 to wirelessly transmit the parent node search signal (step S100 in FIG. 2).
- the parent node search signal is multicast-transmitted to all the parent nodes 1.
- each parent node 1 receives the parent node search signal from the child node 2 (YES in step S200 in FIG. 3), it passes this parent node search signal to the RSSI measuring unit 11.
- the RSSI measurement unit 11 measures RSSI by measuring the strength of the parent node search signal (step S201). This RSSI represents the strength of the radio link with the child node 2 that has transmitted the parent node search signal.
- the reply waiting time determination unit 12 of the parent node 1 determines a reply waiting time corresponding to the RSSI (step S202).
- the reply waiting time waiting unit 13 waits for the determined reply waiting time (step S203), and then instructs the signal transmitting unit 14 to transmit a response signal.
- the signal transmission unit 14 wirelessly transmits a response signal to the child node 2 that is the transmission source of the parent node search signal (step S204). Since the address of the child node 2 is attached as a transmission source address to the parent node search signal transmitted from the child node 2, the signal transmission unit 14 transmits a response signal to the child node 2 having this transmission source address. Is possible.
- Each parent node 1 that has received the parent node search signal performs the above processing.
- the response signal is passed to the parent node selection unit 22.
- the parent node selection unit 22 selects the parent node 1 that regularly communicates with the own node based on the waiting time from when the parent node search signal is transmitted until the response signal is received (step S102).
- the parent node selection unit 22 selects the parent node 1 with the shortest waiting time, that is, the parent node 1 that has returned the response signal the fastest, and sets the source address included in the response signal returned by the parent node 1 as the parent node. Store in the storage unit 23. In this way, a steady communication relationship is established between the selected parent node 1 and child node 2.
- the signal transmission unit 20 of the child node 2 transmits the measurement data to the parent node 1 having a relationship of constantly communicating.
- the child node 2 can select the parent node 1 in consideration of communication stability. As a result, in this embodiment, it is possible to reduce the probability that re-communication will increase, and it is possible to reduce the probability that the battery life of the child node will be shortened unexpectedly.
- 2 and 3 are not limited to once, but may be performed periodically. This makes it possible to select an appropriate parent node according to the latest communication status.
- FIG. 4 is a block diagram showing a configuration of a radio communication system according to the second embodiment of the present invention.
- the same components as those in FIG. 1 are denoted by the same reference numerals.
- This embodiment is based on Principle 2 of the invention described above.
- the radio communication system according to the present embodiment includes a parent node 1a and a child node 2.
- the parent node 1a When the strength of the radio link is equal to or greater than the threshold value, the parent node 1a minimizes the return waiting time when the signal receiving unit 10, the RSSI measuring unit 11, the signal transmitting unit 14, and the wireless link strength are equal to or greater than the threshold.
- the RSSI threshold determination unit 15 is configured to terminate the process without returning the response signal.
- the signal transmission unit 14 and the RSSI threshold value determination unit 15 constitute a reply unit.
- the configuration of the child node 2 is the same as that in the first embodiment.
- FIG. 5 is a flowchart showing the operation of the parent node 1a.
- the child node 2 that wants to search for the parent node 1a that communicates constantly transmits the parent node search signal (step S100 in FIG. 2).
- each parent node 1a receives the parent node search signal from the child node 2 (YES in step S200 in FIG. 5)
- this parent node search signal is measured by RSSI measurement. Pass to part 11.
- the RSSI measurement unit 11 measures RSSI by measuring the strength of the parent node search signal (step S201).
- the RSSI threshold value determination unit 15 of the parent node 1a compares the RSSI measured by the RSSI measurement unit 11 with a predetermined threshold value, and only when the RSSI is equal to or greater than the threshold value (YES in step S205), It instructs the transmission of a response signal.
- the signal transmission unit 14 wirelessly transmits a response signal to the child node 2 that is the transmission source of the parent node search signal (step S206).
- the processing in step S206 corresponds to returning a response signal with a minimum waiting time for reply (0) in the first embodiment.
- the operation of the child node 2 that has received the response signal from each parent node 1a is as described in the first embodiment.
- FIG. 6 is a block diagram showing a configuration of a radio communication system according to the third embodiment of the present invention.
- the same components as those in FIGS. 1 and 4 are denoted by the same reference numerals.
- the radio communication system according to the present embodiment includes a parent node 1a and a child node 2a.
- the configuration of the parent node 1a is the same as that of the second embodiment.
- the child node 2a stores the current value of the threshold used for comparison between the signal transmission unit 20a, the signal reception unit 21, the parent node selection unit 22a, the parent node storage unit 23, the battery 24, and the RSSI. And a threshold storage unit 25.
- the parent node selection unit 22a and the threshold storage unit 25 constitute a threshold changing unit.
- FIG. 7 is a flowchart showing the operation of the child node 2a.
- the parent node selection unit 22a of the child node 2a causes the signal transmission unit 20a to wirelessly transmit the parent node search signal and the threshold value stored in the threshold value storage unit 25 (step S103 in FIG. 7).
- the operation of the parent node 1a that has received the parent node search signal and the threshold value is the same as that of the second embodiment.
- the RSSI threshold value determination unit 15 of the parent node 1a may use the threshold value received by the signal reception unit 10 in the determination in step S205.
- the parent node selection unit 22a of the child node 2a cannot receive the response signal from the parent node 1a (NO in step S104)
- the parent node selection unit 22a determines that the threshold is too high and stores the threshold stored in the threshold storage unit 25. Is reduced by a predetermined change width (step S105), and the process returns to step S103.
- steps S103 to S105 are repeated until a response signal can be received from at least one parent node 1a.
- the parent node selection unit 22a selects the parent node 1a that constantly communicates with the own node (step S106).
- the process in step S106 is the same as step S102 in FIG.
- the processing in FIGS. 5 and 7 is not limited to once, but may be performed periodically.
- the parent node selection unit 22a may return the threshold to the initial value when selection of the parent node is completed.
- the configurations excluding the signal receiving unit 10 and the signal transmitting unit 14 of the parent nodes 1 and 1a according to the first to third embodiments control a computer having a CPU, a storage device and an interface, and control these hardware resources. It can be realized by a program to do.
- the CPUs of the parent nodes 1 and 1a execute the processes described in the first to third embodiments in accordance with a program stored in the storage device.
- the configuration excluding the signal transmission units 20 and 20a, the signal reception unit 21, and the battery 24 of the child nodes 2 and 2a according to the first to third embodiments includes a computer including a CPU and a storage device, and It can be realized by a program that controls the hardware resources.
- the CPUs of the child nodes 2 and 2a execute the processes described in the first to third embodiments according to the program stored in the storage device.
- the present invention can be applied to a technique in which a child node selects a parent node in a wireless communication system.
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Abstract
Description
また、本発明の無線通信システムの1構成例において、前記親ノードは、さらに、前記無線リンクが強いほど前記返信待ち時間が短くなり、前記無線リンクが弱いほど前記返信待ち時間が長くなるように、前記無線リンクの強さに応じて前記返信待ち時間を決定する返信待ち時間決定手段を備え、前記子ノードの親ノード選定手段は、前記応答信号を最も速く返信してきた親ノードを選定することを特徴とするものである。
また、本発明の無線通信システムの1構成例において、前記閾値は、規定値である。
また、本発明の無線通信システムの1構成例において、前記子ノードの送信手段は、前記親ノード探索信号と共に前記閾値を前記親ノードに送信し、前記子ノードは、さらに、前記親ノード探索信号の送信後に前記親ノードからの応答信号を受信できなかった場合に、前記閾値を現在値よりも小さい値に変更して、前記親ノード探索信号と変更後の閾値との再送信を前記送信手段に実行させる閾値変更手段を備えることを特徴とするものである。
また、本発明の無線通信システムの1構成例において、前記測定手段は、前記無線リンクの強さを表す指標としてRSSIを測定することを特徴とするものである。
子ノードの電池寿命が想定外に短くなる要因は、通信が不安定な親ノード(リンクが弱い親ノード)が選定された場合に、通信のやり直しが増えることにあると、発明者は特定した。子ノードから通信可能な親ノードの探索信号が送られた場合に、親ノードは特に一定のルールもなくハードウェアなどに依存した任意の速度で返信する。このような返信の仕方の改善が有効であることに着眼した。
Indicator):受信信号の強度を示す数値)に基づいて親ノードが返信待ち時間を変化させるようにすればよいこと、より具体的にはリンクの強さが強いほど早く返信させ、弱いほど遅く返信させるようにすればよいことに想到した。子ノードは、返信の順番によって親ノードとのリンクの強さの順位を知ることができるので、通信の安定性を考慮して親ノードを選定することができる。つまり、子ノードは、最も速く返信してきた親ノードを選べばよい。このような方法により、子ノード側の探索処理負荷も軽減することができる。
また、発明者は、子ノードとのリンク強さ(RSSI)が閾値以上の親ノードが最速で返信すればよいこと、すなわちリンクの強さが閾値以上のものが早く返信すればよいことに想到した。子ノードは、返信してきた親ノードが自ノードとのリンクの強さが特定の強さ以上のノードであり、その中でどれが最短時間で通信が可能であるかを知ることができるので、通信の安定性と通信の早さの両面を考慮して親ノードを選定することができる。つまり、子ノードは、最も速く返信してきた親ノードを選べばよい。
以下、本発明の実施の形態について図面を参照して説明する。図1は本発明の第1の実施の形態に係る無線通信システムの構成を示すブロック図である。本実施の形態は、上記発明の原理1に基づくものである。
無線通信システムは、上位の通信機器である親ノード1と、例えば親ノード1に計測データを送信するセンサ機器などの下位の通信機器である子ノード(リーフノード)2とから構成される。
親ノード1の信号受信部10は、子ノード2から無線リンクを介してデータを受信すると、このデータを図示しないデータベースに格納する。データベースに格納されたデータは、必要に応じて処理される。親ノード1が例えば制御機器である場合、親ノード1は、子ノード2から受信したデータ(状態量)に基づいて、温度制御、湿度制御、流量制御などを行う。
最初に、定常的に通信する親ノード1を探索したい子ノード2の親ノード選定部22は、信号送信部20に親ノード探索信号を無線送信させる(図2ステップS100)。このとき、子ノード2は、複数の親ノード1の中から通信の安定した親ノード1を探索したいのであるから、親ノード探索信号を全ての親ノード1に向けてマルチキャスト送信する。
RSSI測定部11は、親ノード探索信号の強度を測定することにより、RSSIを測定する(ステップS201)。このRSSIは、親ノード探索信号を送信した子ノード2との間の無線リンクの強さを表している。
親ノード探索信号を受信した各親ノード1は、以上のような処理を行う。
以後、子ノード2の信号送信部20は、定常的に通信する関係を結んだ親ノード1宛に計測データを送信する。
なお、図2、図3の処理は1度だけとは限らず、定期的に行うようにしてもよい。これにより、最新の通信状況に応じた適切な親ノードを選定することができる。
次に、本発明の第2の実施の形態について説明する。図4は本発明の第2の実施の形態に係る無線通信システムの構成を示すブロック図であり、図1と同一の構成には同一の符号を付してある。本実施の形態は、上記発明の原理2に基づくものである。
本実施の形態の無線通信システムは、親ノード1aと、子ノード2とから構成される。
第1の実施の形態で説明したとおり、定常的に通信する親ノード1aを探索したい子ノード2は、親ノード探索信号を送信する(図2ステップS100)。
RSSI測定部11は、親ノード探索信号の強度を測定することにより、RSSIを測定する(ステップS201)。
各親ノード1aからの応答信号を受信した子ノード2の動作は、第1の実施の形態で説明したとおりである。
次に、本発明の第3の実施の形態について説明する。第2の実施の形態では、RSSIとの比較に使用される閾値を予め規定されたものとしたが、子ノードから親ノードに閾値を送るようにしてもよい。図6は本発明の第3の実施の形態に係る無線通信システムの構成を示すブロック図であり、図1、図4と同一の構成には同一の符号を付してある。
本実施の形態の無線通信システムは、親ノード1aと、子ノード2aとから構成される。
子ノード2aの親ノード選定部22aは、親ノード探索信号と閾値記憶部25に記憶されている閾値とを信号送信部20aに無線送信させる(図7ステップS103)。
次に、子ノード2aの親ノード選定部22aは、親ノード1aからの応答信号を受信できない場合(ステップS104においてNO)、閾値が高過ぎたと判断し、閾値記憶部25に記憶されている閾値を所定の変更幅だけ小さくして(ステップS105)、ステップS103に戻る。
親ノード選定部22aは、少なくとも1つの親ノード1aから応答信号を受信できた場合(ステップS104においてYES)、自ノードと定常的に通信する親ノード1aを選定する(ステップS106)。このステップS106の処理は、図2のステップS102と同じである。
同様に、第1~第3の実施の形態の子ノード2,2aの信号送信部20,20aと信号受信部21と電池24とを除く構成は、CPUおよび記憶装置を備えたコンピュータと、これらのハードウェア資源を制御するプログラムによって実現することができる。子ノード2,2aのCPUは、記憶装置に格納されたプログラムに従って第1~第3の実施の形態で説明した処理を実行する。
Claims (12)
- 上位の通信機器である親ノードと、下位の通信機器である子ノードとを有し、
前記親ノードは、
前記子ノードから送信された親ノード探索信号を受信する親ノード探索信号受信手段と、
前記親ノード探索信号を受信したときに、この親ノード探索信号を送信した子ノードとの間の無線リンクの強さを測定する測定手段と、
前記無線リンクの強さに応じた返信待ち時間だけ待機した後に、前記親ノード探索信号の送信元の子ノードに応答信号を返信する返信手段とを備え、
前記子ノードは、
前記親ノード探索信号を送信する送信手段と、
前記応答信号を受信する応答信号受信手段と、
前記親ノード探索信号を送信してから前記応答信号を受信するまでの待ち時間に基づいて、自ノードと定常的に通信する親ノードを選定する親ノード選定手段とを備えることを特徴とする無線通信システム。 - 請求項1記載の無線通信システムにおいて、
前記親ノードは、さらに、前記無線リンクが強いほど前記返信待ち時間が短くなり、前記無線リンクが弱いほど前記返信待ち時間が長くなるように、前記無線リンクの強さに応じて前記返信待ち時間を決定する返信待ち時間決定手段を備え、
前記子ノードの親ノード選定手段は、前記応答信号を最も速く返信してきた親ノードを選定することを特徴とする無線通信システム。 - 請求項1記載の無線通信システムにおいて、
前記親ノードの返信手段は、前記無線リンクの強さが閾値以上の場合に、前記返信待ち時間を最小にして、前記親ノード探索信号の送信元の子ノードに応答信号を返信し、前記無線リンクが前記閾値より弱い場合は、前記応答信号を返信せずに処理を終了し、
前記子ノードの親ノード選定手段は、前記応答信号を最も速く返信してきた親ノードを選定することを特徴とする無線通信システム。 - 請求項3記載の無線通信システムにおいて、
前記閾値は、規定値であることを特徴とする無線通信システム。 - 請求項3記載の無線通信システムにおいて、
前記子ノードの送信手段は、前記親ノード探索信号と共に前記閾値を前記親ノードに送信し、
前記子ノードは、さらに、前記親ノード探索信号の送信後に前記親ノードからの応答信号を受信できなかった場合に、前記閾値を現在値よりも小さい値に変更して、前記親ノード探索信号と変更後の閾値との再送信を前記送信手段に実行させる閾値変更手段を備えることを特徴とする無線通信システム。 - 請求項1乃至5のいずれか1項に記載の無線通信システムにおいて、
前記測定手段は、前記無線リンクの強さを表す指標としてRSSIを測定することを特徴とする無線通信システム。 - 下位の通信機器である子ノードが、親ノード探索信号を送信する送信手順と、
上位の通信機器である親ノードが、前記子ノードから送信された親ノード探索信号を受信する親ノード探索信号受信手順と、
前記親ノードが、前記親ノード探索信号を受信したときに、この親ノード探索信号を送信した子ノードとの間の無線リンクの強さを測定する測定手順と、
前記親ノードが、前記無線リンクの強さに応じた返信待ち時間だけ待機した後に、前記親ノード探索信号の送信元の子ノードに応答信号を返信する返信手順と、
前記子ノードが、前記応答信号を受信する応答信号受信手順と、
前記子ノードが、前記親ノード探索信号を送信してから前記応答信号を受信するまでの待ち時間に基づいて、自ノードと定常的に通信する親ノードを選定する親ノード選定手順とを備えることを特徴とする親ノード探索方法。 - 請求項7記載の親ノード探索方法において、
前記測定手順と前記返信手順との間に、前記親ノードが、前記無線リンクが強いほど前記返信待ち時間が短くなり、前記無線リンクが弱いほど前記返信待ち時間が長くなるように、前記無線リンクの強さに応じて前記返信待ち時間を決定する返信待ち時間決定手順を備え、
前記親ノード選定手順は、前記応答信号を最も速く返信してきた親ノードを選定することを特徴とする親ノード探索方法。 - 請求項7記載の親ノード探索方法において、
前記返信手順は、前記無線リンクの強さが閾値以上の場合に、前記返信待ち時間を最小にして、前記親ノード探索信号の送信元の子ノードに応答信号を返信し、前記無線リンクが前記閾値より弱い場合は、前記応答信号を返信せずに処理を終了し、
前記選定手順は、前記応答信号を最も速く返信してきた親ノードを選定することを特徴とする親ノード探索方法。 - 請求項9記載の親ノード探索方法において、
前記閾値は、規定値であることを特徴とする親ノード探索方法。 - 請求項9記載の親ノード探索方法において、
前記送信手順は、前記親ノード探索信号と共に前記閾値を前記親ノードに送信し、
前記子ノードが、さらに、前記親ノード探索信号の送信後に前記親ノードからの応答信号を受信できなかった場合に、前記閾値を現在値よりも小さい値に変更して、前記親ノード探索信号と変更後の閾値との再送信を実行する閾値変更手順を備えることを特徴とする親ノード探索方法。 - 請求項7乃至11のいずれか1項に記載の親ノード探索方法において、
前記測定手順は、前記無線リンクの強さを表す指標としてRSSIを測定することを特徴とする親ノード探索方法。
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