Abdul- Jabbar: A new Model of a Wireless AD- HOC Network with Sub-Layer Mac 57 A new Model of a Wireless AD- HOC Network with Sub-Layer Mac Using Simevents Tools Abstract Wireless ad-hoc networks with different topologies proved to be a feasible solution for low-cost deployment of computer networks. It provides quick and easy networking in circumstances that require temporary network services or when cabling is difficult to be installed. In this paper, an analytical model of a wireless ad-hoc network is presented, in addition, a new model for wireless ad-hoc network with a sub-layer MAC is designed using Simevents tools. It is also taken into account the effect of the contention process and losses on the sub-layer MAC, then OPNET software is used to validate this model. Finally, the results of a practical single-hop wireless ad-hoc network using six computers are compared with the results of the proposed models. It is obvious that there is an excellent agreement between the throughput performances of the different models. Key words: Wireless, Ad-Hoc, MAC, Simevents. خلصح أل تأقوحاسىب وخ اىاس شثناعقىه لسرث حلخريفحخ اىفياطثىغشانيح راخ اىشمضج اىلسيخ غيش اىىشثناثرد ا أث فيىح السرخذاثناخ سشعح وسهى اىشح, وذىفش هز ذنيفصية صعىتح ذذاخ فىسيح أو عى خذىري ذحراج إى اىظشوف ا نيح. اىشثنح اىسيرج خذيذ ىهزى ينيح ومزىل ذصشمضج اىلسيثنح غيش اى ىيشاضيىرج سي قذي ذحث, ذ في هزا اىث طثقح اىفشعيح اىشثنح ىيMAC ذأثيشلخز تاىحسثا اد. وذ افي أدواخ سيسرخذا تافس واىايح اىري ع خسائش عيى ثنح غيشح ىيشييئح اىعراح اىقاس دىرج. وأخيشا, ذح هزا اى صح د ىيرأمذيح اوتا تش اسرخذقح, ث اىطث هز اك هىاضح أ اىح وقرشحرج اىائح اىرا ع سد حاسثاخ حنىاحذج واىىنيح راخ اىقفضج اىشمضج اىلسي اى قوءج اىء مفا أداراص تي ذىافقخريفح.رج اىا ىي Received: 19 – 9 - 2011 Accepted: 21 – 11 - 2011 جديد لمشبكة نموذجلسمكية غير الممركزة ال لمطبقة الفرعيةMAC خدام أدوات سيم افينت باست Dr. A.I. A. Jabbar* Assistant Professor Saad Ahmed Ayoob* Assistant Lecturer *Electrical Eng. Dept., College of Engineering, Univ. of Mosul. سعد أحمد أيوب* مساعد مدرس د.لجبار له عبدا عبدال* أستاذ مساعد * موصلمعة اللهندسة، جائية، كمية الكهربا قسم الهندسة ا