Umay-6T: Mobility-resilient cell caching for uninterrupted 6TiSCH networks
COMPUTER NETWORKS, cilt.286, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 286
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.comnet.2026.112503
- Dergi Adı: COMPUTER NETWORKS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, ABI/INFORM, Aerospace Database, Applied Science & Technology Source, Compendex, INSPEC, Library, Information Science & Technology Abstracts (LISTA), zbMATH, Information Science & Technology Abstracts (LISTA), EBSCO Communication Source, Business Source Ultimate (EBSCO), Communication Source (EBSCO), Engineering Source (EBSCO), Technology Collection (ProQuest)
- Karadeniz Teknik Üniversitesi Adresli: Evet
Özet
Industrial Internet of Things applications require reliable, energy-efficient, and deterministic wireless communication, particularly in environments where node mobility and intermittent connectivity are common. The IETF IPv6 over the TSCH mode of IEEE 802.15.4e (6TiSCH) architecture, built on IEEE 802.15.4e TSCH, provides time-frequency synchronized medium access for mission-critical systems. However, existing scheduling functions typically interpret neighbor disconnections as permanent topology changes and immediately remove allocated cells, leading to repeated 6P negotiations, increased control overhead, and prolonged reconnection latency when disruptions are short-lived. This paper presents Umay-6T, a lightweight and standard-compliant scheduling function that improves mobility resilience in 6TiSCH networks through a soft-state redefinition of the cell lifecycle at the 6top layer. Rather than adjusting slotframe size or relying on location information as in prior mobility-aware schedulers, Umay-6T temporarily retains previously negotiated cells in a bounded cache and directly reactivates them upon neighbor reappearance, without initiating a new 6P ADD negotiation. Extensive simulations conducted in Contiki-NG and Cooja under different node densities and mobility regimes show that, in mobile scenarios, Umay-6T reduces both 6P and RPL control overhead, with RPL overhead cut by up to around 40% and 6top overhead by up to around 20% against the Minimal Scheduling Function (MSF) in dense deployments, while improving packet delivery ratio by up to 3-4 percentage points over widely used scheduling functions such as MSF, the Distributed Scheduling Function (DSF), and DeTAS. End-to-end latency remains comparable to the best-performing baseline in most settings and is reduced by up to 13-22% against MSF in mobile grid topologies.