scholarly journals A Novel GTS Mechanism for Reliable Multihop Transmission in the IEEE 802.15.4 Network

2012 ◽  
Vol 8 (1) ◽  
pp. 796426 ◽  
Author(s):  
WoongChul Choi ◽  
SeokMin Lee
Keyword(s):  
Ieee 802.15.4 ◽  
Time Slot ◽  
Multihop Networks ◽  
Delivery Ratio ◽  
Sensitive Data ◽  
Low Delay ◽  
Reliable Transmission ◽  
Simulation Results ◽  
Ieee 802.15.4 Standard ◽  
Guaranteed Time Slot

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.

Sequential Beacon Scheduling Mechanism for Cluster-Tree WSNs

2012 ◽  
Vol 263-266 ◽  
pp. 932-938
Author(s):  
Hao Ru Su ◽  
Zhi Guo Shi ◽  
Zhi Liang Wang
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Ieee 802.15.4 ◽  
Wireless Sensor ◽  
Delivery Ratio ◽  
Cluster Tree ◽  
Collision Problem ◽  
Interference Range ◽  
Scheduling Mechanisms ◽  
Simulation Results

To solve the beacon collision problem in IEEE 802.15.4/ZigBee cluster-tree Wireless Sensor Networks, we proposed a Sequential Beacon Scheduling (SBS) mechanism. In this mechanism, the Cluster Headers (CHs) choose the beacon transmission time in a certain order. The CH which finishes the sequence chosen sends out control frame to inform other CHs in its interference range. The simulation results indicate that SBS general has better delivery ratio, latency, and throughput than three other beacon scheduling mechanisms.

scholarly journals Implementation and evaluation of a 2.4 GHz multi-hop WSN: LoS, NLoS, different floors, and outdoor-to-indoor communications

2021 ◽  
Vol 11 (6) ◽  
pp. 5170
Author(s):  
Vasin Chaoboworn ◽  
Yoschanin Sasiwat ◽  
Dujdow Buranapanichkit ◽  
Hiroshi Saito ◽  
Apidet Booranawong
Keyword(s):  
Ieee 802.15.4 ◽  
Base Station ◽  
Sensor Nodes ◽  
Line Of Sight ◽  
Delivery Ratio ◽  
Packet Delivery ◽  
Communication Reliability ◽  
Ieee 802.15.4 Standard ◽  
Test Scenarios ◽  
Non Line Of Sight

In this paper, the communication reliability of a 2.4 GHz multi-hop wireless sensor network (WSN) in various test scenarios is evaluated through experiments. First, we implement an autonomous communication procedure for a multi-hop WSN on Tmote sky sensor nodes; 2.4 GHz, an IEEE 802.15.4 standard. Here, all nodes including a transmitter node (Tx), forwarder nodes (Fw), and a base station node (BS) can automatically work for transmitting and receiving data. The experiments have been tested in different scenarios including: i) in a room, ii) line-of-sight (LoS) communications on the 2nd floor of a building, iii) LoS and non-line-of-sight (NLoS) communications on the 1st floor to the 2nd floor, iv) LoS and NLoS communications from outdoor to the 1st and the 2nd floors of the building. The experimental results demonstrate that the communication reliability indicated by the packet delivery ratio (PDR) can vary from 99.89% in the case of i) to 14.40% in the case of iv), respectively. Here, the experiments reveal that multi-hop wireless commutations for outdoor to indoor with different floors and NLoS largely affect the PDR results, where the PDR more decreases from the best case (i.e., the case of a)) by 85.49%. Our research methodology and findings can be useful for users and researchers to carefully consider and deploy an efficient 2.4 GHz multi-hop WSN in their works, since different WSN applications require different communication reliability level.

Energy Efficient Beacon-Enabled IEEE 802.15.4 Guaranteed Time Slot-Based Adaptive Duty Cycle Algorithm for Wireless Sensor Network

2021 ◽  
pp. 2150256
Author(s):  
Manoj Tolani ◽  
Sunny ◽  
Rajat Kumar Singh
Keyword(s):  
Duty Cycle ◽  
Energy Efficient ◽  
Ieee 802.15.4 ◽  
Simulation Analysis ◽  
Time Slot ◽  
Load Condition ◽  
Medium Access Control Protocol ◽  
Traffic Load ◽  
Medium Access ◽  
Guaranteed Time Slot

In this work, energy-efficient adaptive duty cycle guaranteed time slot algorithm is proposed for beacon-enabled standard medium access control protocol to efficiently handle low, medium and high data traffic loads. The proposed protocol can efficiently handle high traffic load by effective utilization of slots. The protocol can dynamically update the number of slots for contention access period and contention free period in each beacon interval. Therefore, it can capably handle high network load condition. The protocol continuously monitors the utilization capacity of each of the sensor node and allots the contention free period slots to the needy nodes based on their utilization capacity. Simulation analysis is done for three different scenarios. The performance of the proposed protocol is compared with the other existing protocols. Simulation results show the overall superiority of our proposed algorithm in terms of packet delivery and energy consumption.

Rational Allocation of Guaranteed Time Slots to support real-time traffic in Wireless Body Area Networks

2021 ◽  
Vol 11 ◽  
Author(s):  
Gulshan Soni ◽  
Kandasamy Selvaradjou
Keyword(s):  
Real Time ◽  
Ieee 802.15.4 ◽  
Time Slot ◽  
The Body ◽  
Body Area ◽  
The Real ◽  
Real Time Traffic ◽  
Delay Sensitive ◽  
Rational Allocation ◽  
Guaranteed Time Slot

Background: The main requirement of Wireless Body Area Network (WBAN) is on-time delivery of vital signs that are sensed through the delay-sensitive biological sensors that are implanted in the body of the patient being monitored to the central gateway. The Medium Access Control (MAC) protocol standard IEEE 802.15.4 supports real-time data delivery through its unique feature called Guaranteed Time Slot (GTS) under its beacon-enabled mode. This protocol is considered suitable for the WBAN Scenario. However, as per standard, IEEE 802.15.4 uses a simple and straightforward First Come First Served (FCFS) mechanism to distribute GTS slots among the contender nodes. This kind of blindfolded allocation of GTS slots results in poor utilization of bandwidth and also prevents the delay-sensitive sensor nodes from effectively utilizing the contention-free slots. Objective: The main objective of this work is to provide a solution for the unfair allocation of GTS slots in the beacon-enabled mode of the IEEE 802.15.4 standard in WBAN. Method: We propose a Rational Allocation of Guaranteed Time Slot (RAGTS) protocol that distributes the available GTS slots based on the delay-sensitivity of the contender nodes. Results: A series of simulation experiments has been performed to assess the performance of our proposed RAGTS protocol. The simulations capture the dynamic nature of the real-time deadlines associated with sensor traffic. Through simulations, we show that our proposed RAGTS protocol appears to be more stable in terms of various performance metrics than that of the FCFS nature of the GTS allocation technique. Conclusion: In this article, we introduced the RAGTS scheme that enhances the real-time traffic feature of the beacon-enabled mode of IEEE 802.15.4 MAC.

Sign in / Sign up

Export Citation Format

Share Document