• International Journal of Internet, Broadcasting and Communication
• /
• v.8 no.1
• /
• pp.53-63
• /
• 2016

This paper applies WiMedia UWB network into a wireless ship area network (WSAN) so as to support high-quality multimedia services on board and reliable instrument control information as well, since the need for mixed high-quality video traffic and shipboard control data traffic is essential for a high-cost valued digital ship. Thus, in this paper, prioritized contention access (PCA) and distributed reservation protocol (DRP) based on WiMedia UWB (ECMA-368) MAC protocols are combined and proposed to such mixed traffic environment, by varying the portions of superframe according to traffic type. It is shown that the proposed WiMedia UWB MAC protocol can provide reliable mixed video and shipboard control data traffic as well.

• Journal of Korea Multimedia Society
• /
• v.6 no.1
• /
• pp.121-127
• /
• 2003

In this paper, we propose a load balancing QoS routing on a targe scale network. We use the scheme in which it calculates the cost of resources with a precomputation and then selects a path among multiple paths based on the calculated cost for each resources. We also use the QoS routing scheme for the transit and the intra-traffic on a large scale domain-based network. For a domain in networks, this routing scheme precomputes K multiple paths between all pairs made up with each ingress and egress border routers along with the consideration of a load balancing, and then picks up paths having the high probability on the Path selection. This routing scheme can be applied for the transit traffic and the intra traffic and combines the Inter-domain and intra-domain routings seamlessly and put a high priority on the transit traffic Thus, these schemes make Possible both the global use of network resources and the load balancing.

• Journal of the Korea Society of Computer and Information
• /
• v.7 no.2
• /
• pp.101-114
• /
• 2002

The real multimedia application in wide area communication needs the guaranteed performance of communication service. Therefore, the resource is reserved at the moment of traffic burst and the region of connection admission possibility is widened at the basis of maximum cell rate. This of study shows that the end-to-end traffic delay to the traffic of burst state is guaranteed when the total of maximum transmission rate is higher than link speed by using the region of deterministic delay. The network load rate of connection admission can be improved by the inducement of delay bounds consideration each traffic characteristic to guarantee the end-to-end delay of network from single switch. This suggested buffering system using deterministic service do not give any influence to service quality and can guarantee the bounds of end-to-end delay. And it can also reduce the load of network even if the delay is increased according to the burst traffic characteristic. The above suggested system can be applied effectively to the various kinds of general network specification which admit both real time trafnc service and non-real time traffic service.

• Proceedings of the IEEK Conference
• /
• 2000.07b
• /
• pp.747-749
• /
• 2000

A new scheduling algorithm called the Adaptive Weighted Round Robin with Delay Tolerance (AWRR/DT) is presented. The proposed scheme can reduce the average delay of non-real-time (NRT) class while maintaining the QoS of real-time (RT) classes. Our scheme can also reflect the traffic fluctuation of networks with a small processing burden.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.16 no.12
• /
• pp.2614-2618
• /
• 2012

Recently, multimedia broadcasting traffic is explosively increasing since the performance of smartphones is significantly enhanced and capacity of mobile access network such as LTE is steeply increasing. We can accommodate the multimedia broadcasting traffic via general unicast scheme or eMBMS which is a broadcast-specific scheme. First, the unicast scheme provides higher spectral efficiency compared to the eMBMS. However, unfortunately, the efficiency of the unicast scheme dramatically decreases as the number of users increases. On the other hand, although the spectral efficiency of the eMBMS is lower than that of the unicast, it can serve many users with a channel. Thus, this paper defines and investigates the capacity efficiencies of the both schemes for multimedia broadcasting traffic. In addition, we derive the optimal number of users where the eMBMS can provide the higher capacity efficiency than that of the unicast scheme.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.42 no.11
• /
• pp.1-12
• /
• 2005

In wireless personal area networks(PANs), the successful design of channel time allocation algorithm is a key factor in guaranteeing the various quality of service(QoS) requirements for the stringent real-time constraints of multimedia services. In this paper we propose a dynamic channel time allocation algerian for providing delay guarantees to multimedia traffics such as MPEG streams in the IEEE 802.15.3 high-rate WPANs. The dynamic algorithm exploits the characteristics of MPEG stream, wherein the devices (DEVs) send their channel time requests only at the end of superframe boundaries. The algerian uses mini packets for feedback control in order to deliver dynamic parameters for channel time requests from the DEVs to the piconet coordinator (PNC). In this scheme, the duration of channel time allocated to a DEV during a superframe is changed dynamically depending on the MPEG frame type, traffic load and delay bound of the frame, etc. Performance of the proposed scheme is investigated by simulation. Our results show that compared to traditional scheme, the proposed scheme is very effective and has high performance while guaranteeing the delay bound.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.35 no.5A
• /
• pp.447-451
• /
• 2010

We propose an advanced BMPA (balanced multimedia packet allocation) scheme. The proposed scheme considers the optimal resource allocation problem in OFDMA system. When NRT (non-real time), RT (real time), multicast packets arrive at the same time in OFDMA system, the advanced BMPA chooses the best sub-carrier as a multicast channel for multicast packets, gives more weight to RT packets and multicast packets than NRT packets and allocates sub-carriers according to the total weight sum of packets in each user. With simulation results, this paper shows that the advanced BMPA scheme ensures QoS (long-term system throughput and multimedia packet delay) in heterogeneous traffic compared with multicast MU-WF (multi-user water-filling) and BMPA schemes.

• Journal of KIISE:Computer Systems and Theory
• /
• v.26 no.8
• /
• pp.939-948
• /
• 1999

주문형 비디오나 원격 회의 그리고 원격 강의와 같은 멀티미디어 애플리케이션들은 비디오나 오디오와 같은 멀티미디어 트래픽을 유발한다. 이러한 멀티미디어 트래픽의 가장 큰 특성은 폭주성이다. 폭주성은 통신망의 효율을 떨어뜨리는 매우 중요한 요인이며, 따라서 폭주성에 대처할 수 있는 효율적인 대역폭 할당 정책이 통신망 관리에서 매우 중요하다. 본 논문에서는 멀티캐스팅 방식의 온라인 비디오 애플리케이션에 대해서 대역폭 완화 작업이라고 불리우는 효율적이고 유용한 대역폭 할당 방안을 설계하였다. 본 논문에서 제시하는 새로운 대역폭 완화 기법은 비디오 서버에서 이미 전송된 데이타의 특성을 이용하여 대역폭 완화창의 크기를 조절하는 동적인 기법이다. 몇 가지 MPEG 트레이스들로 실험했을 때 기존의 온라인 대역폭 완화 기법과 비슷한 성능을 보이고, 특히 멀티캐스팅 방식의 온라인 비디오 서비스에 대해서는 서버의 자원 효율성을 향상시킴을 알 수 있었다. Abstract All of the multimedia applications such as VOD, teleconferencing, and tele-lecturing invoke multimedia traffic like video or audio traffic. The most important characteristic of these multimedia traffic is the burstiness property. So, bandwidth management is becoming the major part of network management. In this paper, we propose a new and efficient bandwidth management technique called bandwidth smoothing for the multicasting on-line video applications. Our bandwidth smoothing technique reduces as much of the network bandwidth required to transmit on-line video traffic as previously proposed methods, and improves the server's resource utilization especially for the multicast on-line video services.

• The Transactions of the Korea Information Processing Society
• /
• v.6 no.1
• /
• pp.167-174
• /
• 1999

In this paper, we propose the adaptive separated-queueing ATM switching model for the effective processing of the various types of multimedia traffic by virtue of ATM switching network with multiple outlets which is the essential part of B-ISDN. This proposed model employs the dynamically separated buffering mechanism in the processing of two classes of cell, realtime service traffic and non-realtime service traffic, at the output buffer to enhance the overall QoS(Quality of Service). The adopted ATM switch architecture has Batcher-banyan based network, but it uses different topologies and control techniques 6to resolve the cell contention. For the performance evaluation of our proposed method, we have done both analytical modeling and simulation. The both results show that our proposed queueing strategy is quite appropriate to the ATM switch with multiple outlets and can quarantee the QoS requirements of the incoming multimedia traffic.

• Journal of IKEEE
• /
• v.6 no.2 s.11
• /
• pp.161-168
• /
• 2002

Network of these days, A transmission medium of information is replaced from electric signal to optical signal to accept various and increased network traffic. In this paper, we develop simulation program using AweSim and simulate EPON system as a high-speed optical subscriber network with various conditions. The effects of number of ONUs, effects of network load and effects of slot assignment schemes have been evaluated. The simulation results show that slot assignment schemes and number of ONUs is major factor of network performance. The variable-number slot scheme is more efficient than fixed-length slot scheme in the traffic processing.