QoS in wireless sensor networks: survey and approach
EATIS '07 Proceedings of the 2007 Euro American conference on Telematics and information systems
An optimal GTS scheduling algorithm for time-sensitive transactions in IEEE 802.15.4 networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
A mathematical model for performance of IEEE 802.15.4 beacon-enabled mode
Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly
ICCSA '09 Proceedings of the International Conference on Computational Science and Its Applications: Part II
Performance analysis of GTS allocation in beacon enabled IEEE 802.15.4
SECON'09 Proceedings of the 6th Annual IEEE communications society conference on Sensor, Mesh and Ad Hoc Communications and Networks
Adaptive GTS allocation scheme to support QoS and multiple devices in 802.15.4
ICACT'09 Proceedings of the 11th international conference on Advanced Communication Technology - Volume 3
ART-GAS: an adaptive and real-time GTS allocation scheme for IEEE 802.15.4
AINTEC '11 Proceedings of the 7th Asian Internet Engineering Conference
Adaptive ED scan for 802.15.4 based wireless personal area networks
Proceedings of the 6th International Conference on Ubiquitous Information Management and Communication
Enhanced guaranteed time slot algorithm for the IEEE802.15.4 standard
Proceedings of the 3rd International Conference on Information and Communication Systems
A New QoS Resource Allocation Scheme Using GTS for WPANs
Wireless Personal Communications: An International Journal
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The IEEE 802.15.4 Medium Access Control (MAC) protocol is an enabling technology for time sensitive wireless sensor networks thanks to its Guaranteed-Time Slot (GTS) mechanism in the beacon-enabled mode. However, the protocol only supports explicit GTS allocation, i.e. a node allocates a number of time slots in each superframe for exclusive use. The limitation of this explicit GTS allocation is that GTS resources may quickly disappear, since a maximum of seven GTSs can be allocated in each superframe, preventing other nodes to benefit from guaranteed service. Moreover, the GTSs may be only partially used, resulting in wasted bandwidth. To overcome these limitations, this paper proposes i-GAME, an implicit GTS Allocation Mechanism in beacon-enabled IEEE 802.15.4 networks. The allocation is based on implicit GTS allocation requests, taking into account the traffic specifications and the delay requirements of the flows. The i-GAME approach enables the use of a GTS by multiple nodes, while all their (delay, bandwidth) requirements are still satisfied. For that purpose, we propose an admission control algorithm that enables to decide whether to accept a new GTS allocation request or not, based not only on the remaining time slots, but also on the traffic specifications of the flows, their delay requirements and the available bandwidth resources. We show that our proposal improves the bandwidth utilization compared to the explicit allocation used in the IEEE 802.15.4 protocol standard. We also present some practical considerations for the implementation of i-GAME, ensuring backward compatibility with the IEEE 801.5.4 standard with only minor add-ons.