4th International ICST Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks

Research Article

Connection-Level QoS Provisioning in Multiple Transmission Technology-based OFDM System

  • @INPROCEEDINGS{10.1109/WIOPT.2006.1666449,
        author={Youngkyu  Choi and  Sunghyun  Choi and Sung-Pil  Hong},
        title={Connection-Level QoS Provisioning in Multiple Transmission Technology-based OFDM System},
        proceedings={4th International ICST Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks},
        publisher={IEEE},
        proceedings_a={WIOPT},
        year={2006},
        month={8},
        keywords={},
        doi={10.1109/WIOPT.2006.1666449}
    }
    
  • Youngkyu Choi
    Sunghyun Choi
    Sung-Pil Hong
    Year: 2006
    Connection-Level QoS Provisioning in Multiple Transmission Technology-based OFDM System
    WIOPT
    IEEE
    DOI: 10.1109/WIOPT.2006.1666449
Youngkyu Choi1,*, Sunghyun Choi1,*, Sung-Pil Hong2,*
  • 1: School of Electrical Engineering and INMC, Seoul National University, Seoul, Korea
  • 2: Department of Industrial Engineering, Seoul National University, Seoul, Korea
*Contact email: ykchoi@mwnl.snu.ac.kr, schoi@snu.ac.kr, sphong@snu.ac.kr

Abstract

To provide heterogeneous quality-of-service (QoS) to various applications, the bandwidth of orthogonal frequency division multiplexing (OFDM) is divided into multiple number of sub-bands, which employ a different set of transmission technologies, such as multiple-input multiple-output (MIMO), packet scheduling, adaptive modulation and coding (AMC), and hybrid automatic repeat request (HARQ) depending on the traffic type. According to this concept, DiffSeg system, where the two-dimensional resource domain of OFDM is filled with four different resource units, called segments, and the occupancy ratio of each type of segment is determined by the segment map, has been recently proposed in [5][6]. In this paper, we introduce a concept of segment diversion to utilize the radio resource more efficiently considering the status of QoS. We then propose a system optimization model, which finds an optimal segment map and diversion ratios of real-time (RT) connections in order to maximize the residual resource for non-real-time (NRT) traffic while satisfying the minimum QoS requirement of RT traffic. We formulate an optimization problem using mixed integer programming, and then develop two computationally efficient algorithms: simplex-based heuristic and Maximum Diversion Rule. Especially, Maximum Diversion Rule is shown to achieve a near-optimal solution with dramatically less complexity.