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Abstract(s)
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.
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Publisher
IEEE