Journal of the Korea Society of Computer and Information (한국컴퓨터정보학회논문지)

Korean Society of Computer Information (한국컴퓨터정보학회)
권호 표지
DOI QR코드

DOI QR Code

Cross-Layer Optimized Resource Allocation Scheme for OFDMA based Micro Base Stations

OFDMA 기반 마이크로 기지국을 위한 계층간 최적화된 자원할당 기법

  • 조성현 (국립경상대학교 컴퓨터과학부)
  • Received : 2010.03.09
  • Accepted : 2010.05.18
  • Published : 2010.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, a joint PHY-MAC layer optimized resource allocation scheme for OFDMA based micro base stations is investigated. We propose cross-layer optimized two-stage resource allocation scheme including cross-layer functional description and control information flow between PHY-MAC layers. The proposed two-stage resource allocation scheme consists of a user grouping stage and a resource allocation stage. In the user grouping stage, users are divided into a macro base station user group and a micro base station user group based on the PHY-MAC layer characteristics of each user. In the resource allocation stage, a scheduling scheme and an allotment of resources are determined. In the proposed scheme, diversity and adaptive modulation and coding (AMC) schemes are exploited as schedulers. Simulation results demonstrate that the proposed scheme increases the average cell throughput about 40~80 % compared to the conventional system without micro base stations.

본 논문은 직교주파수분할다중접속방식 기반의 마이크로 기지국을 위한 PHY-MAC 계층에서 최적화된 자원할당 기법에 대해 연구한다. 본 논문에서는 PHY-MAC 계층 간 제어 정보 흐름 및 기능 구현을 포함하여 계층 간 최적화된 2단계 자원할당 기법을 제안한다. 제안하는 2단계 자원할당 기법은 사용자 그룹핑 단계 및 자원할당 단계로 구성된다. 사용자 그룹핑 단계에서는 각 사용자별 PHY-MAC 계층 특성에 따라 사용자들을 매크로 기지국 자원을 할당받을 사용자 그룹과 마이크로 기지국 자원을 할당받을 사용자 그룹으로 분류한다. 자원할당 단계에서는 사용자 그룹 내의 각 사용자별로 실제 할당 받을 자원의 형태 및 양을 결정하는 스케줄러를 정의한다. 제안하는 기법에서는 다이버시티 및 AMC 기법을 스케줄러 정의에 활용한다. 시뮬레이션 결과는 제안하는 방법이 마이크로 기지국을 고려하지 않는 기존 방법에 비해 평균 셀 수율을 40~80% 증가시킬 수 있음을 보인다.

Keywords

References

  1. A. Jalali, R. Padovani, and R. Pankaj, "Data throughput of CDMA-HDR a high efficiency-high data rate personal communication wireless system," Proc. of IEEE VTC'2000, May 2000, vol.3, pp.1854-1858.
  2. A. Leke and J. M. Cioffi, "A maximum rate loading algorithm for discrete multitone modulation systems," Proc. of IEEE Globecom'97, Nov. 1997, vol.3, pp.1514-1518.
  3. H. Bang and T. Ekman, "Opportunistic Round Robin with Extended Window for Time Correlated Channels" Proc. of IEEE VTC'2007, Apr. 2007, pp.2860-2863.
  4. G. Song and Y. Li, "Adaptive Resource Allocation Based on Utility Optimization in OFDM," Proc. of IEEE Globecom'2003, Dec. 2003, vol.2, pp.586-590.
  5. J. Rhee, J. M. Holtzman, and D. Kim, "Scheduling of Real/Non-real Time Services: Adaptive EXP/PF Algorithm," Proc. of IEEE VTC'2003-Spring, Apr. 2003, vol.1, pp.462-466.
  6. V. Corvino, V. Tralli, and R. Verdone, "Cross-layer radio resource allocation for Multicarrier Air Interfaces in Multicell Multiuser Environments," IEEE Trans. on Vehicular Technology, May 2009, vol. 58, no. 4, pp. 1864-1875. https://doi.org/10.1109/TVT.2008.2009456
  7. J. Tang and X. Zhang, "Cross-layer Resource Allocation over Wirelay Networks for Quality of Service Provisioning," IEEE Journal on Selected Areas in Commun., May 2007, vol. 25, no. 4, pp. 645-656. https://doi.org/10.1109/JSAC.2007.070502
  8. S. Shakkottai and T. S. Rappaport, "Cross-Layer Design for Wireless Networks," IEEE Comm. Mag., Oct. 2003, vol.41, pp.74-80.
  9. S. Cho, W. Park, and S. Yun, "PHY-MAC Cross-layer Design for Efficient Resource Allocation in OFDM/A Systems," Proc. of World Wireless Congress'05, May, 2005.
  10. W. Chen, K. Lataief, and Z. Cao, "A Unified Corss-Layer Framework for Resource Allocation in Cooperative Netowrks," IEEE Trans. on Wireless Commun., Aug. 2008, vol.7, no.8, pp.3000-3012. https://doi.org/10.1109/TWC.2008.060831
  11. R. Chen, W. Liu, J. Li, C. Li, and J. Li, "A Fair Cross-Layer Resource Allocation Scheme with Diverse QoS Guaranteeing," Proc. of WiCom'09, Sept. 2009, pp.1-5.
  12. M. Bohge, J. Gross, A. Wolisz, and M. Meyer, "Dynamic Resource Allocation in OFDM Systems: An Overview of Cross-Layer Optimization Principles and Techniques," IEEE Networks, Jan. 2007, vol.21, no.1, pp.53-59. https://doi.org/10.1109/MNET.2007.314539
  13. T. Kwon, S. Cho, H. Lee, S. Choi, J. Kim, S. Yun, W. Park, D. Cho, and K. Kim, "Design and Implementation of Simulator based on Cross-Layer Protocol between MAC and PHY Layers in WiBro Compatible IEEE 802.16e OFDMA System," IEEE Communications Magazine, vol.43, no.12, pp.136-146, December 2005.
  14. M. Airy and R. W. Heath, "Spatially Greedy Scheduling in Multi-User MIMO Systems," Proc. of IEEE Asilomar, Nov. 2003, pp.9-12.

Cited by

  1. OFDMA 시스템에서 핸드오버를 위한 부하제어 기반의 QoS 제공 방안 vol.18, pp.2, 2013, https://doi.org/10.9708/jksci.2013.18.2.059