• Title/Summary/Keyword: GTS allocation

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A Weight based GTS Allocation Scheme for Fair Queuing in IEEE 802.15.4 LR-WPAN (IEEE 802.15.4 LR-WPAN 환경에서 공정 큐잉을 위한 가중치 기반 GTS 할당 기법)

  • Lee, Kyoung-Hwa;Lee, Hyeop-Geon;Shin, Yong-Tae
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.47 no.9
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    • pp.19-28
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    • 2010
  • The GTS(Guaranteed Time Slot) of the IEEE 802.15.4 standard, which is the contention free access mechanism, is used for low-latency applications or applications requiring specific data bandwidth. But it has some problems such as delay of service due to FIFS(First In First Service) scheduling. In this paper, we proposes a weight based GTS allocation scheme for fair queuing in IEEE 802.15.4 LR-WPAN. The proposed scheme uses a weight that formed by how much more weight we give to the recent history than to the older history for a new GTS allocation. This scheme reduces service delay time and also guarantees transmission simultaneously within a limited time. The results of the performance analysis shows that our approach improves the performance as compared to the native explicit allocation mechanism defined in the IEEE 802.15.4 standard.

Adaptive GTS allocation scheme with applications for real-time Wireless Body Area Sensor Networks

  • Zhang, Xiaoli;Jin, Yongnu;Kwak, Kyung Sup
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.5
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    • pp.1733-1751
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    • 2015
  • The IEEE 802.15.4 standard not only provides a maximum of seven guaranteed time slots (GTSs) for allocation within a superframe to support time-critical traffic, but also achieves ultralow complexity, cost, and power in low-rate and short-distance wireless personal area networks (WPANs). Real-time wireless body area sensor networks (WBASNs), as a special purpose WPAN, can perfectly use the IEEE 802. 15. 4 standard for its wireless connection. In this paper, we propose an adaptive GTS allocation scheme for real-time WBASN data transmissions with different priorities in consideration of low latency, fairness, and bandwidth utilization. The proposed GTS allocation scheme combines a weight-based priority assignment algorithm with an innovative starvation avoidance scheme. Simulation results show that the proposed method significantly outperforms the existing GTS implementation for the traditional IEEE 802.15.4 in terms of average delay, contention free period bandwidth utilization, and fairness.

A GTS Scheduling Algorithm for Voice Communication over IEEE 802.15.4 Multihop Sensor Networks

  • Kovi, Aduayom-Ahego;Bleza, Takouda;Joe, Inwhee
    • International journal of advanced smart convergence
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    • v.1 no.2
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    • pp.34-38
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    • 2012
  • The recent increase in use of the IEEE 802.15.4 standard for wireless connectivity in personal area networks makes of it an important technology for low-cost low-power wireless personal area networks. Studies showed that voice communications over IEEE 802.15.4 networks is feasible by Guaranteed Time Slot (GTS) allocation; but there are some constraints to accommodate voice transmission beyond two hops due to the excessive transmission delay. In this paper, we propose a GTS allocation scheme for bidirectional voice traffic in IEEE 802.15.4 multihop networks with the goal of achieving fairness and optimization of resource allocation. The proposed scheme uses a greedy algorithm to allocate GTSs to devices for successful completion of voice transmission with efficient use of bandwidth while considering closest devices with another factor for starvation avoidance. We analyze and validate the proposed scheme in terms of fairness and resource optimization through numeral analysis.

Efficient GTS Allocation Method of Industrial IEEE 802.15.4 Network for Real-time Periodic I/O Data (효율적 GTS 할당 기법을 통한 산업용 IEEE 802.15.4 망의 실시간 주기성 데이터의 전송 기법)

  • Kim, Dong-Sung;Lee, Jung-Il
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.5
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    • pp.510-516
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    • 2010
  • In this paper, a dynamic GTS allocation method of wireless control networks is proposed for the use of factory automation using IEEE 802.15.4 MAC protocol. A superframe of IEEE 802.15.4 is applied to the transmission method of real-time periodic I/O data of wireless control systems within the limited time in factory environment. The method is proposed for efficient transmission of real-time periodic I/O traffic. The simulation results show the average network utilization and available I/O node numbers could be increased by the proposed method.

A Priority Based MAC Protocol for Emergency Data Transmission in Wireless Body Area Networks (WBAN 환경에서 응급 데이터 전송을 위한 우선순위 기반 MAC 프로토콜)

  • Lee, Hyeop-Geon;Lee, Kyoung-Hwa;Shin, Yong-Tae
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.49 no.4
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    • pp.26-33
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    • 2012
  • Please WBAN(Wireless Body Area Networks) is wireless communication of within 3 m radius from inside and outside of the body. WBAN is many uses IEEE 802.15.4 MAC protocol for WBAN MAC protocol requirements. IEEE 802.15.4 MAC protocol applies GTS(Guaranteed Time Slot) allocation scheme for guarantee packet delivery of application which requests QoS(Quality of Service). However, GTS allocation scheme of IEEE 802.15.4 MAC protocol uses FIFS(First In First Service) queueing. So it reduces data transmission reliability and has many problems. Therefore, IEEE 802.15.4 applies not WBAN MAC protocol for emergency data transmission. In this paper, we proposes a priority based MAC protocol for emergency data transmission in wireless body area networks. the proposal MAC protocol sets priority the data. So GTS reqeuest throughput of emergency data increasing and GTS allocation delay of emergency data decreasing.

Queuing Analysis of IEEE 802.15.4 GTS Scheme for Bursty Traffic (Bursty Traffic을 위한 IEEE 802.15.4 GTS 기법의 대기 해석)

  • Le, Nam-Tuan;Choi, Sun-Woong;Jang, Yeong-Min
    • Journal of Satellite, Information and Communications
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    • v.5 no.2
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    • pp.87-91
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    • 2010
  • The IEEE 802.15.4 and IEEE 802.15.7 standard are the typical of low rate wireless and Visible Light Wireless personal area networks. Its Medium Access Control protocol can support the QoS traffic flows for real-time application through guaranteed time slots (GTS) in beacon mode. However, how to achieve a best allocation scheme is not solved clearly. The current analytical models of IEEE 802.15.4 MAC reported in the literature have been mainly developed under the assumption of saturated traffic or non-bursty unsaturated traffic conditions. These assumptions don't capture the characteristics of bursty multimedia traffic. In this paper, we propose a new analytical model for GTS allocation with burst Markov modulated ON-OFF arrival traffic.

Algorithm of GTS Time Slots Allocation Based on Weighted Fair Queuing in Environments of WBAN (WBAN 환경에서 Weighted Fair Queuing 기반의 GTS 타임 슬롯 할당 알고리즘)

  • Kim, Kyoung-Mok;Jung, Won-Soo
    • Journal of the Korea Society of Computer and Information
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    • v.16 no.11
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    • pp.45-56
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    • 2011
  • WBAN is short range wireless communication technology which is consists of several small devices close to, attached to or implanted into the human body. WBAN is classified into between medical and non-medical by applications based on technology and medical data with periodic characteristics is used the GTS method for transmitting data to guarantee the QoS. In this paper we proposed algorithm that resolve lack of GTSs while data transmit GTS method in superframe structure of WBAN. Coordinator dynamically allocates GTSs according to the data rate of devices and make devices share GTSs when lack of GTSs. We compared delay bounds, throughput for performance evaluation of the proposed algorithm. In other words, we proposed algorithm adaptive WFQ scheduling that GTS allocation support differential data rate in environments of WBAN. The experiment results show the throughput increased and the maximum delay decreased compared with Round Robin scheduling.

A New GTS Allocation Scheme Considering Periodic Characteristic of IEEE 802.15.4 Wireless Sensor Network (센서 네트워크의 주기적인 성질을 고려한 IEEE 802.15.4 GTS 할당 방법)

  • Ho Eun Kwon;Sueng Jae Bae;Min Young Chung
    • Proceedings of the Korea Information Processing Society Conference
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    • 2008.11a
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    • pp.1215-1218
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    • 2008
  • IEEE 802.15.4 기반의 무선 센서 네트워크는 다양한 종류의 센서들로 구성된다. 이러한 센서들은 각각 다양한 주기들로 중심 노드에게 데이터를 전송하고자 한다. 슈퍼프레임마다의 주기적인 전송을 위해 IEEE 802.15.4에서는 GTS(Guaranteed Time Slot) 메커니즘을 제공한다. 하지만 하나의 센서 네트워크에서 슈퍼프레임 길이는 모두 동일하기 때문에 이보다 긴 주기를 갖는 센서들은 GTS를 할당받고도 데이터를 전송하지 않는 경우가 발생할 수 있다. 때문에 IEEE 802.15.4의 GTS 메커니즘에서는 낮은 사용 효율의 문제가 발생한다. 본 논문은 이러한 문제를 보완하고자 주기적 GTS 할당 방법(PGTS: Periodic Guaranteed Time Slot)을 제안한다. 주기적 GTS 할당 방법에서는 단말들이 GTS 요청 시 자신의 데이터 전송 주기를 PAN 코디네이터에게 보고하고, PAN 코디네이터는 이를 고려하여 단말의 주기에 따른 슈퍼프레임에서만 GTS 구간을 할당한다. 이를 통해 주기적 GTS 할당 방법은 기존 GTS 할당 방법보다 대역의 낭비를 줄여 GTS를 효율적으로 사용가능하도록 하고 더 많은 수의 단말들에게 GTS를 배정할 수 있게 한다. 본 논문에서는 시뮬레이션 결과를 통해 주기적 GTS 할당 방법이 IEEE 802.15.4의 GTS 할당 방법보다 효율적이며 더 많은 수의 단말에게 GTS를 할당할 수 있음을 확인하였다.

A Parent-controlled Collision Avoidance Scheme in GTS-based Wireless Sensor Network (GTS 기반 무선 센서 네트워크에서 부모 제어 충돌 회피 방안)

  • Lee, Kilhung
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.13 no.5
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    • pp.27-34
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    • 2014
  • This paper presents a collision avoidance scheme for wireless sensor networks that use a GTS-based channel allocation scheme. Many sensor nodes can share a GTS channel for sending their data to the sink node. When a node tries to send a frame at a shared GTS channel, a collision can be occurred when there is a node that uses the same backoff number. For decreasing a wireless collision, the parent assigns a backoff number when a child node registers to it. Further, when a collision occurs during a data transfer, the parent node reassigns a new backoff number for the child node. Simulation results show that there is a decreased collision number with suggested parent-controlled collision avoidance scheme by effectively controlling the backoff number of the child.

Dynamic GTS Allocation Method for real-time periodic I/O Data in Industrial Environment (산업 환경에서의 실시간 주기 무선 I/O 노드들을 위한 동적 GTS 할당 기법에 대한 연구)

  • Lee, Jungi-Il;Jung, Ji-Won;Kim, Dong-Sung
    • Proceedings of the KIEE Conference
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    • 2007.10a
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    • pp.205-206
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    • 2007
  • 본 논문에서는 산업용 무선 제어네트워크의 네트워크 이용률과 가용 무선 I/O 노드 수를 동시에 증대시길 수 있는 동적 GTS할당 기법을 제안하였다. 모의실험을 통해, 제안된 동적 GTS할당 기법이 가용 노드수와 네트워크 이용률의 향상시킴을 살펴 볼 수 있다.

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