Abstract
The IEEE 802.15.4 standard provides Guaranteed Time Slot (GTS) mechanism for reliable transmission. GTS mechanism is suitable for transmitting time-sensitive data because it allocates time slots to a specific node. However, the GTS mechanism in the standard can be used only for one-hop communication. This paper proposes and implements a multihop GTS mechanism for reliable transmission in multihop networks. Simulation results using NS-2 show that low delay and high delivery ratio can be achieved using the proposed mechanism.
Highlights
Reliable communication in data networking is normally defined to ensure that there is no loss of data, that the packets are in the right order, that the delay is to an acceptable level, and that there is no duplication of packets
Retransmission and sequence number are generally used to guarantee the features of the reliable transmission of no loss of packets and of the packets in the right order, respectively
This paper proposes and evaluates a novel Guaranteed Time Slot (GTS) allocation mechanism for the multihop path from a node to a sink node in the beacon-enabled network of the IEEE 802.15.4 standards
Summary
Reliable communication in data networking is normally defined to ensure that there is no loss of data, that the packets are in the right order, that the delay is to an acceptable level, and that there is no duplication of packets. The GTS mechanism is supported in the beacon-enabled mode in order for a specific node to be able to use a channel exclusively during a certain time interval. This paper proposes and evaluates a novel GTS allocation mechanism for the multihop path from a node to a sink node in the beacon-enabled network of the IEEE 802.15.4 standards. Media access is contention based (slotted or unslotted CSMA/CA); in the beaconenabled mode, Guaranteed Time Slots can be allocated by the PAN coordinator exclusively to devices willing to transmit time-sensitive data or data requiring specific bandwidth reservation. The allocated device transmits a data frame without checking the channel if it is idle or not; that is, fast transmission is possible because there is no processing delay for the CSMA/CA mechanism.
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