Open Access

Guaranteed time slot trade-off in QOS improvement with IEEE standard 802.15.4 for wireless sensor networks at the MAC layer

   | Aug 18, 2020

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Figure 1:

Networks – (A) With GTS, (B) mixed, (C) without GTS.
Networks – (A) With GTS, (B) mixed, (C) without GTS.

Figure 2:

Superframe structure (Koubaa et al., 2007).
Superframe structure (Koubaa et al., 2007).

Figure 3:

Flow Chart: Working of GTS, non-GTS, and mixed sensor networks.
Flow Chart: Working of GTS, non-GTS, and mixed sensor networks.

Figure 4:

Network output load: (A) PAN coordinator (B) End device.
Network output load: (A) PAN coordinator (B) End device.

Figure 5:

CSMA medium access delay: (A) PAN coordinator (B) End device.
CSMA medium access delay: (A) PAN coordinator (B) End device.

Figure 6:

CSMA transmission failure (A) PAN coordinator (B) GTS end device.
CSMA transmission failure (A) PAN coordinator (B) GTS end device.

Figure 7:

Queue size (A) PAN coordinator (B) End device.
Queue size (A) PAN coordinator (B) End device.

Figure 8:

Queuing delay (A) PAN coordinator (B) End device.
Queuing delay (A) PAN coordinator (B) End device.

Parametric values for PAN coordinator and end devices in three different networks.

PAN coordinator End device
Device type Mixed Mixed
Parameter/network With GTS With GTS Without GTS Without GTS With GTS With GTS Without GTS Without GTS
Acknowledged traffic parameters
MSDU interarrival time (sec) Exponential (2)
MSDU size (bits) Exponential (912)
Start time (sec) 0.1
Stop time (sec) 180
Destination MAC address Broadcast PAN coordinator
Unacknowledged traffic parameters
MSDU interarrival time (sec) Exponential (2)
MSDU size (bits) Exponential (912)
Start time (sec) 0.1
Stop time (sec) 180
CSMA parameters
Maximum backoff number 4
Minimum backoff exponent 3
IEEE 802.15.4
Device mode PAN coordinator End device
MAC address Auto assigned
WPAN settings
Beacon order 3
Superframe order 2
PAN ID 0
Logging
Enable logging Enabled
GTS settings
GTS permit Enabled Disabled Enabled Disabled
Start time (sec) 0.1 Infinity 0.1 Infinity
Stop time (sec) 180 Infinity 180 Infinity
Length (slots) 2 0 2 0
Direction Receive Transmit Transmit Transmit
Buffer capacity (bits) 10,000 1000 1000 1000
GTS traffic parameters
MSDU interarrival time (sec) Exponential (2) Constant (1.0) Exponential (2) Constant (1.0)
MSDU size (bits) Exponential (912) Constant (0.0) Exponential (912) Constant (0.0)
Acknowledgment Enabled Disabled Enabled Disabled
eISSN:
1178-5608
Language:
English
Publication timeframe:
Volume Open
Journal Subjects:
Engineering, Introductions and Overviews, other