• Title, Summary, Keyword: 목표 전송률

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Optimal target data rate to maximize average data rate under Rayleigh fading channel model (레일리 무선채널 모델하에서 평균 데이터 전송률을 최대로 하기위한 최적 목표 전송률)

  • Kwon, Taehoon
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.327-328
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    • 2019
  • 본 논문에서는 레일리 페이딩 채널 모델하에서 평균데이터 전송률을 최대화 할 수 있는 목표 데이터 전송률을 분석하였다. 같은 무선채널환경에서 목표 데이터 전송률이 높아질수록 오류 없이 전송될 확률은 낮아진다. 반면, 목표 데이터 전송률이 낮아지면 오류 없이 전송될 확률은 높아지지만, 한번에 보내는 데이터 양이 작아지게 된다. 따라서, 주어진 무선 채널 환경을 최대로 활용하기 위해서는 오류 전송 확률과 목표 데이터 전송률을 고려하여 최대 평균 데이터 전송률을 얻기 위한 조건에 대한 분석이 선행되어야 한다. 본 논문에서는 평균 데이터 전송률을 정의하고, 이를 최대화하기 위한 목표 데이터 전송률을 분석하였다. 분석 결과는 몬테카를로 모의 시뮬레이션을 통하여 정확성을 증명하였다.

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A Three-Color Marking Mechanism for Fairness Improvement in the Assured Service of the Diffserv Network (차등 서비스 네트워크의 확신 서비스에서 공평성 향상을 위한 3색 마킹 메커니즘)

  • 모상덕;정광수
    • Journal of KIISE:Information Networking
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    • v.30 no.6
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    • pp.764-775
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    • 2003
  • Previous works for the assured service in the Diffserv network have no sufficient consideration on the fairness of bandwidth share based on RTTs and the target rates of TCP flows. In this paper, in order to solve these problems, we propose a TRA3CM(Target rate and RTT Aware 3 Color Marking) mechanism. The TRA3CM mechanism provides three color marking and fair transmission rates among aggregate flows by considering RTT and target rate simultaneously. In case of higher target rate than bottleneck bandwidth, the TRA3CM mechanism is able to mitigate the RTT effect and provides fair transmission rates. In the results of comparing the performance among existing mechanisms and the TRA3CM, the TRA3CM mechanism was able to mitigate the RTT effect better than the former. The TRA3CM is shown to provide good performance for transmission rates proportional to various target rates.

A Mechanism to Improve the Fairness of the AF Service in Diffserv Network (차등 서비스 네트워크에서 AF 서비스의 공평성 향상 기법)

  • 모상덕;정광수
    • Journal of KIISE:Information Networking
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    • v.31 no.5
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    • pp.469-481
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    • 2004
  • Previous works for the AF(Assured Forwarding) service in the Diffserv network have no sufficient consideration on the fairness of bandwidth share based on RTTs, the target rates, and the impact of UDP against TCP. In this paper, in order to solve these problems, we propose a FDSA(Fair Differentiated Service Architecture) composed of TRA3CM(Target rate and RTT Aware 3 Color Marking) and TRBD(Target Rate Based Dropping) mechanisms. The TRA3CM and TRBD mechanisms provide three color marking and fair transmission rates among aggregate flows by considering RTT, target rate, and UDP flows simultaneously. In the results of comparing the performance among existing mechanisms and the TRA3CM-TRBD, the TRA3CM-TRBD mechanism was able to mitigate the RTT and UDP effect better than the former. The TRA3CM-TRBD is shown to provide good performance for transmission rates proportional to various target rates.

The Mechanism for TCP-UDP Fairness Improvement in the Assured Service of the Diffserv Network (차등 서비스 네트워크의 확신 서비스에서 TCP-UDP 공평성 향상 기법)

  • 모상덕;정광수
    • Proceedings of the Korean Information Science Society Conference
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    • pp.481-483
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    • 2004
  • 본 논문에서는 차등 서비스 네트워크(Diffserv network)의 확신 서비스(assured service)에서 발생할 수 있는 TCP와 UDP 플로우 사이의 공명성 문제를 해결하기 위한 TRBD(Target Rate-based Dropping) 기법을 제안한다. 차등 서비스 네트워크의 확신 서비스에서의 공평성 향상에 대한 기존 연구는 마킹 확률을 변경하여 공평성을 향상시키는 연구가 중심이 되어 왔다. 이러한 연구들은 코어노드에서의 큐 관리를 위하여 주로 MRED(Multiple RED)골 이용하기 때문에 TCP 및 UDP, 목표 전송률 등에 대한 고려가 부족하다. 본 논문에서 제안하는 TRBD 기법은 코어노드에서 목표 전송률에 따라 UDP의 폐기 확률을 조정하여 TCP-UDP 공평성 및 목표 전송률을 고려한 공평성을 향상시킬 수 있다. ns 시뮬레이터를 이용한 실험을 통하여 TRBD 기법의 TCP-UDP 공평성 향상을 확인하였다.

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A Fair Bandwidth Distribution Mechanism for the AF Service in a Diffserv Network (차등서비스 네트워크의 AF 서비스를 위한 공정한 대역분배 기법)

  • Mo, Sang-Dok;Chung, Kwang-Sue
    • Journal of KIISE:Information Networking
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    • v.32 no.6
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    • pp.732-744
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    • 2005
  • Previous works for the AE(Assured Forwarding) service in the Diffserv network have no sufficient consideration on the fairness of bandwidth share based on the target rate and the effect or RTT and UDP. Also Previous works act like Best-effort service in the UPN(under-Provisioned Network) condition. In this paper, in order to solve these problems, we propose the PFDSA(Proportionally Fair Differentiated Service Architecture) composed of tmTRA3CM(tcp-microflow based Target rate and an Aware Three color Marking), um3CM(udp-microflow based Three color Marker), TRBD(Target Rate Based Dropper), and target rate adjusting function. In the results of comparing the performance among existing mechanisms and the PFDSA, the PFDSA was able to mitigate the RTT and UDP effect better than the former. The PFDSA was shown to provide good performance for transmission rates proportional to various target rates in the UPN condition.

A Study on Control Scheme for Fairness Improvement of Assuared Forwarding Services in Differentiated Service Network (DiffServ 망에서 AF 서비스의 공평성 향상을 위한 제어 기법)

  • Kim, Byun-gon;Jeong, Dong-su
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.649-652
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    • 2015
  • Previous marking policy for the AF service of TCP traffic in the Diffserv network have no sufficient consideration on the effect of RTT and target rate. In this paper, in order to improve fairness Index by the effect RTT difference of TCP traffic, we propose the modified TSW3CDM(Time Sliding Window Three Color Dynamic Marker) based on average transfer rate estimation and the flow state. The proposed algorithm is dynamic marking policy that do allocate band width in proportion to transmission rate. To evaluate the performance of the proposed algorithm, We accomplished a computer simulation using NS-2. From simulation results, the proposed TSW3CDM algorithm improves fairness index by comparison with TSW3CM.

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Model-based Macroblock Layer Rate Control for Low Bit Rate Video Coding (저전송률 비디오 압축을 위한 모델 기반 매크로블록 레이어 비트율 제어)

  • Park, Sang-Hyun
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.46 no.4
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    • pp.50-57
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    • 2009
  • This paper presents a new model-based macroblock layer rate control algorithm for low bit rate video coding which generates output bits corresponding to a target bit budget. The H.264 standard uses various coding modes and optimization methods to improve the compression performance, which makes it difficult to control the generated traffic accurately in low bit rate environments. In the proposed scheme, we first estimate MAD values of macroblocks in a frame and define a target remaining bits using the estimated MAD values before encoding each macroblock. If a difference between the target value and the actual value is greater than a threshold value, the quantization parameter is adjusted to decrease the difference. It is shown by experimental results that the new algorithm can obtain more than 66% decrease of the difference between the target bits and the resulting bits for a frame with the PSNR performance better than that of the existing rate control algorithm.

Efficient Power and Rate Adaptation Strategy for Improved Spectral Efficiency in Multi-Carrier DS-CDMA Communications (다중 반송파 부호분할 다중접속 통신에서의 주파수 효율 향상을 위한 효율적인 전력 및 전송률 적응화 기법)

  • Lee, Ye Hoon;Kim, Dong Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.8
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    • pp.697-703
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    • 2013
  • We propose an efficient frequency-time domain resource allocation scheme in multi-carrier (MC) direct-sequence code-division multiple-access (DS/CDMA) communications. We consider, as a power allocation strategy in the frequency domain, transmitting each user's DS waveforms over the user's sub-band with the largest channel gain. We then consider rate adaptation in the time domain, where the data rate is adapted such that a desired transmission quality is maintained. We analyze the achievable average data rate of the proposed scheme with fixed average transmission power, and compare the performance to single carrier DS/CDMA systems with power and rate adaptations.

Design of Low Bits Rate Transform Excitation Wide Band Speech and Audio Coder of Analysis-by-Synthesis Structure (분석/합성 구조의 저 전송률 변환여기 광대역 음성/오디오 부호화기 설계)

  • Jang, Sunghoon;Hong, Kibong;Lee, Insung
    • The Journal of the Acoustical Society of Korea
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    • v.31 no.7
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    • pp.472-479
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    • 2012
  • This paper is aimed to design 9.2 kbps low bits late transform excitation coder that target to voice and audio signal. To set up low bit rate, we used Band-selection in frequency domain and gain-shape quantization and AbS structure. To decrease lots of calculation from ABS structure, we used each band IDFT and synthesis. And we designed non-transfer band for performance by inserting comfort noise. We propose coder that has low bit rate and similar performance comparing with original 10.4 kbps AMR-WB+ TCX mode.

Traffic smoothing of large-scale mission critical system (대규모 임무지향시스템의 네트워크 트래픽 스무딩 방법)

  • Lee, In-Woong;Kim, Tae-Wan;Lee, Dong-Ho;Lee, Sang-Hoon
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.199-201
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    • 2012
  • 본 논문은 함정의 대규모 임무지향시스템에서 전술 데이터를 전송할 때 발생할 수 있는 인코더와 디코더 언더플로우를 방지하고, 트래픽이 프레임 별로 역동적으로 발생할 수 있는 환경을 고려하여 트래픽 스무딩을 수행한 전송 시스템에 대하여 설명한다. 기존의 H.263, H.264의 전송 표준 방식인 on-off policing 방법은 인코더의 목표 비트 전송률(Target Bit Rate)에 따라서 일정한 값으로 정해지는 것과 달리, 프레임을 인코딩함으로써 발생한 프레임의 전체 셀 량과 슬라이스 별로 발생하는 데이터 셀의 역동성을 반영하여 프레임마다 전송시간과 전송률을 반영해주면 부드럽게 전술 데이터의 전송이 일어난다. 또한 기존의 on-off policing과 제시한 대규모 임무지향시스템에서의 트래픽 스무딩 알고리듬의 성능을 비교하여 분석한다.

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