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. [...]
[...] From eq.(4), we can find that the constraint is convex. Since an objective function and other constraint are affine functions, the problem eq.(1) is convex problem and a point which satisfies a KKT condition is an optimal solution Next, we find the optimal solution of eq.(1) by finding a point which satisfies KKT condition. The optimal solution of eq.(1) should satisfy following KKT conditions: where, Pt means the transmission power of indoor RASs, SINRi means the average SINR of an MS PLj(A) means the pathloss of an indoor RAS j at a point and R is the set of the locations of outdoor RASs. [...]
[...] IST-WINNER II Deliverable D v WINNER II Interim Channel Models, December 2006. Edwin K.P.Chong and Stanislaw H.Zak, An Introduction to Optimization. 2nd edNew York;John Wiley & Sons Ltd Dong-Hyun Lee, Hwan-Joong Lee, YoungWoo Lee and Dong-Houn Shin,Wireless broadband services and network management system in KT,International Journal of Network Management, vol no pp - 442, Nov S. Kiani, G. Oien, and D. Gesbert, Maximizing multicell capacity using distributed power allocation and scheduling, in: IEEE Wireless Communications and Networking Conference (WCNC) 2007, pp. [...]
[...] CONCLUSIONS From the above discussion we come to know that, 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 802.16 e 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. [...]
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