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WIMAX, New Developments 2011 Part 17

Tham khảo tài liệu 'wimax, new developments 2011 part 17', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Multi-hop Relay Networks 425 3.2 Example of Deployment Cost Analysis This section discusses the relative CAPEX and OPEX total cost of ownership of an MMR approach versus a conventional WiMAX deployment at 3.5 GHz to meet the same coverage and capacity requirements. This is studied for the urban environment with heavy traffic and for the urban suburban and rural environments with light traffic. The cell structures are dimensioned for a minimal SINR of 3.7dB at the edge. The cell split for conventional WiMAX is based on capacity demand whereas the MMR system is dimensioned for heavy load. The channel bandwidth is 30 20 and 10 MHz for conventional WiMAX MMR-BS and RS respectively. The spectral efficiency is 5 b s Hz for conventional WiMAX and MMR-BS and 2 b s Hz for the Rs. In the analyzed deployment scenarios the MMR-BS to RS ratio is 1 56 1 33 and 1 12. CAPEX consists of site acquisition and construction costs per cell wired backhaul costs and station costs e.g. hardware software . Backhauling and station costs for a MMR-BS are assumed to be higher than for a conventional BS. Civil work expenditures are supposed to be the same for base stations and much lower for deploying a RS which is also considered much cheaper than any BS. OPEX comprises all administrative costs for backhaul access points and network. This expenditure is considered to be the same for the base stations and much lower for a RS. A sample of the analyzed networks and the resulting deployment costs normalized and relative to the MMR CAPEX value with RS to MMR-BS ratio 56 are showed in Figure 14. In the conventional WiMAX deployment CAPEX is a significant cost with respect to OPEX. In the MMR approach CAPEX decreases if the MMR-BS to RS ratio increases and it is considerably less than OPEX in the capacity limited scenario heavy traffic . Further the total costs of the MMR approach are always less than those for the conventional WiMAX and savings in expenditure from capacity improvement in heavy .