Time Division Multiple Access with Dynamic Spreading Factor Control in LoRa

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  • LoRaにおける動的拡散率制御を用いた時分割多元接続方式

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近年，省電力遠距離通信が可能な無線通信規格（LPWA：Low Power Wide Area）を用いたIoTシステムの開発が行われている．LPWAの一種であるLoRa通信ではMAC層にALOHA方式を用いており，複数ノードによる通信では通信衝突が発生する可能性がある．そこで，通信衝突を防ぐために時分割多元接続方式の適用が研究されている．しかし，低速度なLoRa通信では1ノードに対する通信間隔が大きく開き，システムのリアルタイム性が損なわれてしまう．本稿では，既存の時分割多元接続方式をベースに，通信の信頼性と速度に関わるLoRa拡散率の動的制御を用いることで，伝送遅延を考慮した通信方法を考案し検証した．

In recent years, IoT systems with low power wide area (LPWA) wireless communication standards have been deployed. LoRa is a kind of LPWA, and it employs ALOHA as its MAC protocol. ALOHA allows communication collisions, then it is a problem under the large number end-devices circumstance. Therefore, the application of the time-division multiple access method has been studied to avoid communication collisions. However, in LoRa communication, the communication interval for one node gets to be large because of its low data rate. As a result, the real-time performance of the system gets to be degraded. In this paper, we propose the time division multiple access with dynamic spreading factor control in LoRa based on the existing time division multiple access method. It optimizes the data latency and the reachability. This paper also reports the verification results.

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