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06/08/2009
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WiBro technology

  1. Introduction
  2. Network management in WiBro system and architecture
  3. Key factors related to WiBro technology
  4. Modeling and analysis of proposed network management for indoor system
  5. Numerical results and discussions
  6. Conclusions
  7. References

This technology is the latest advancement in Wireless Communication which presents drastic change in Wireless Internet and helps connect each and every person globally. It is the most advanced and upcoming technology now a days. WiBro is the Portable Internet Service to provide a high data rate and wireless internet access with PSS (Personal Subscriber Station) under the stationary or mobile environment, anytime and anywhere. It is part of the IEEE 802.16 family such as WiMAX. It follows IEEE 802.16e standard. With the help of WiBro, it is possible to expand the bandwidth and to accommodate a plenty of user to access the wireless internet. Because of large frequency band of 2.3 to 2.4 GHz and channel bandwidth of 9 MHz, it can cover of large coverage area of hundreds and thousands of km. It adopts TDM multiplexing , TDD duplexing technique and OFDMA multiple access technique. Due to OFDMA all the carriers are orthogonal to each other,it minimizes the self-interference.

[...] However, a fault in wireless link between MS and indoor RAS can not be detected without WiBro EMS function. In the proposed scheme, the fault of indoor RAS is not directly reported to WiBro NMS, rather reported though a neighbor RAS along an indirect path. That is why we call this backward diagnosis algorithm. not changed by Pt. The objective function can be changed as follows: Fig Modified RNG-REQ massage formant for backward diagnosis algorithm B. Fault compensation for indoor WiBro system The indoor environment is usually in interference-limited situation, which means the effect of interference is much larger than the effect of white gaussian noise. [...]


[...] In case of abnormal disconnection, the MS sets TLV type 18 as 1 and writes down the ID of the corrupted RAS into TLV type 19 field as shown in Fig MODELLING AND ANALYSIS OF PROPOSED NETWORK MANAGEMENT FOR INDOOR WIBRO SYSTEM In this section, we introduce the efficient fault reporting scheme of an indoor RAS without deploying WiBro EMS agent function for each indoor RAS. Also, an network management system should minimize damage caused by the fault through an efficient fault compensation algorithm, which minimizes the interference and provides a seamless connection for the users of indoor WiBro system. [...]


[...] Key Factors Related to WiBro Technology Frequency Band: 2.3 to 2.4 MHz Channel BW: 9 MHz Modulation: QPSK,16QAM,64QAM Mobility: 60 km/h to 120 Km/h Duplex: TDD Multiple Access: OFDMA Handoff: <=150ms Coverage: 50 to 200 Km Throughput: Download 512 Mbps to 3Mbps Upload 128 Kbps to 1Mbps Fig.1 Layered architecture for network management The layered architecture for network management can not be directly applied to indoor WiBro system because the network architecture of indoor WiBro system is not the same as the network architecture of the existing outdoor Fig Backward diagnosis algorithm The proposed backward diagnosis algorithm is implemented by modifying a message which is used for network entry procedure. [...]

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