1 Introduction
-
A separate design principle is proposed for multichannel scheduling in priority-aware packet collection. SDP not only guarantees the transmission priority of different sensors but also decreases the transmission delay of the lower priority sensors by allowing them to reuse the slots scheduled to higher priority sensors opportunistically.
-
Noting that the periodic transmission benefits the decrease of packet transmission delay, a greedy multichannel superframe determination (GMSD) algorithm is devised to optimize the multichannel superframe design.
-
The lower bound of mean packet transmission delay for each class of sensors is derived. It is also proved that the SDP-based scheduling obtains lower mean waiting delay than non-overlap TDMA scheduling.
2 Related works
3 Problem description
3.1 Network models
3.2 Priority-aware multichannel scheduling problem
3.2.1 Optimal multichannel superframe design
3.2.2 Priority-aware transmission coordination
4 Main results
4.1 Multichannel superframe design
4.1.1 TDMA-based multichannel superframe design
4.1.2 Mean packet transmission delay
4.1.3 Determination of multichannel superframe
4.2 Separate design principle for priority-aware packet collection
5 Performance analysis
5.1 Mean transmission delay analysis based on SDP
5.2 Comparison with non-overlap scheduling
6 Simulation study and experiments
Number of channels: |
L=16 |
Period of superframe: |
T=16×2 |
Number of priority classes: |
C=4 |
Number of sensors in each priority class: |
N
1=20, N
2=30, |
N
3=40, N
4=50 | |
Utilization of each priority class: |
ρ
1=0.1, ρ
2=0.1, |
ρ
3=0.2, ρ
4=0.2 |