Design and Analysis WIMAX Network Based on Coverage Planning

In this paper, wireless network is planned; the network is predicated on the IEEE 802.16e standardization by WIMAX. The targets of this paper are coverage maximizing, service and low operational fees. WIMAX is planning through three approaches. In approach one; the WIMAX network coverage is major for extension of cell coverage, the best sites (with Band Width (BW) of 5MHz, 20MHZ per sector and four sectors per each cell). In approach two, Interference analysis in CNIR mode. In approach three of the planning, Quality of Services (QoS) is tested and evaluated. ATDI ICS software (Interference Cancellation System) using to perform styling. it shows results in planning area covered 90.49% of the Baghdad City and used 1000 mobile subscribers and percentage connect with base station 84.3% on the establish QoS requirements .

. WIMAX supports rural and city broadband coverage with less cost, the WIMAX technology depends on IEEE 802.16e (Al-Hilfi, Salih et al. 2018). In our planning, we chose the city of Baghdad for fixed outdoor coverage, simulator for radio planning and coverage utilized by ATDI ICS telecom. (ATDI -Advanced Topographic Development & Images, 2011). Radio planning is supported from 10 KHz to 450 GHz frequency by ICS telecom. The both fixed and mobile-WIMAX is been a tool by an ideal radios planning, various methods of process FDD and TDD, for the whole frequency bands and various bandwidths. the distance to which the signal is traveled in a geographical area with a block by Coverage through specified by means of two keys; path loss and received signal power( Zaiab .T Alisa.2013) The results establish COST 231 Hata model is the best model for WIMAX coverage at a 3.5GHz frequency to get better coverage. The rest of the paper is structured as follows. Section 2 discusses the WIMAX network planning model. Section 3 discusses Simulation Model include Coverage, Interference analysis,and QoS analysis according to Service flows results are discussed. Section 4 concludes the paper.

WIMAX NETWORK PLANNING MODEL
An arrangement of a network that is able to maximize the execution is being found additionally satisfying all objectives by the WIMAX network planning. enclose on the first chosen probably position locations for base station (BS)spread, determination from the wanted number from sectors while suitable tools from every active location, i.e. antennas, into the saving from effective covering and appeasement from transit request of subscribers in the wrapped region (Teterin and Hurley 2014). In next sections are explaining the components of the Simulation modeled network:-

Potential site locations
In the paper, the WiMAX network built on the IEEE 802.16e technology and has been Scheme for constant outside coverage for the city of Baghdad see figure1. A group of possible locations for base station positioning.

Choose the frequency range
The wireless network has been a significant impacted on the dimension and layout by Frequency range. Actual idea is displayed using the frequency range around the world by the following representation. 3.5 GHz range by us planning is chosen because it is for it is greatly applied around the scholar. Furthermore, that range is allowed thus overlap is beneath a rule and permits utilizing higher sending force. However, the NLOS status is supported and best range and coverage than 2.5 GHz and 5.8 GHz.

Publishing model for WIMAX at 3.5 GHz
The Hata model is submitted accordingly an arithmetical term for relieve the most effective match from diagrammatic the most effective match through vintage Okumura model (Katev 2012 Where: f MHz is the center frequency in MHz, (hb) is the effective height of the base station antenna, (hm) is the height of the mobile station antenna, d is the distance between the base station and mobile station and Q= 0 or 3 dB depending on the environment, it is 0dB in the suburban and rural areas and 3 dB in the urban environment.

SIMULATION MODEL
Simulation Model contains three sections Details of coverage planning, Interference analysis in CNIR mode, QoS analysis according to Service flows.

Coverage planning
Next the Base station is mounted and organized (e.g. power, azimuth and tilt set) a coverage space of Baghdad city is known. A real time transfer protocol (RTP) is taken into account for becoming coated by a sector if the received signal force is robust sufficient, i.e. on top of the sensitivity threshold (Zhang, Y. and H.-H. Chen,2007).The sensitivity level R defined at the RTP limited the minimum received power level needed for the subscriber instrumentality to spot the signal with an appropriate level of errors among the noise and interference. The receiver should be able to decode data bits with a BER less than 10 −6 this might vary with completely different equipment and user service requirements, as the threshold value has been selected to have an uplink and downlink system gain balanced (Zainab Ibrahim Abood ,2017). These nominal values are given in We chose Twelve location coverage in Baghdad city permission is going to be complete to define that bases station site is best coated to be adopted, and therefore best coverage cell is Not taking into consideration as shown in Fig.3, to realize most coverage with as littlest range to avoid overlapping, that is diagrammatic by the rose area in   In planning, we used 18 and 24 base stations to cover the city of Baghdad using Omni Antennas show in Figure.6 the difference between stations by percentage for total covered and Linked subscriber covered and gives their best.

Interference analysis in CNIR mode
This CNIR analysis will allow checking which modulation (bit rate) will be lost according to the interference. for that a C/(N+SumI) planning must be calculated. this covered planning will be calculated based upon a noise floor N and the interference rejection factors (IRF) of the equipment. A noise floor 107 dBm. There is two type of interferenece ,when a subscriber in a neighboring cell employ the same channel frequency is occurred by the first type is called cochannel interference(CCI).when a subscriber in the same region uses a neighboring channel frequency is occurred by Secondtype Adjacent Channels Interference(ACI). A table showing the amount of each C/I in(dB) and IRF mask (dB).

QoS analysis according to Service flows
The QoS of the network also varies according to the contention ratio of the connections along the day. A 24h QoS analysis can therefore be calculated. mobile subscribers will be used to simulates traffic during 24h and number of covered mobile subscribers is 1000/1000 show in Fig.10.
In Fig.11 the result show quality of service for uplik and downlink with activity and mobile subscriber connect according to Service flows.

Figure.11
Network response to QoS Service flows.

CONCLUSION
In this paper, The WIMAX network planning used 24 and18 base stations (BS) in different profile bandwidth 5MHz, 20MHz with 3.5GHz frequency range and the middle distance covered by a base station was improved to10km in WIMAX for high solid modulation technique QPSK1/2 using ATDI ICS Telecom. In planning managed to cover an area of Baghdad city 467.34 2 . the ability of base station is can be backing active subscribers As the number of