隨著無線通信技術的蓬勃發展，人們日漸習慣無所不在的寬頻存取，無線寬頻服務正逐漸實現。無線寬頻接取技術已被視為提供高速、無線與行動多媒體的解決方案。近幾年來，學界與業界相繼貢獻各式各樣的技術來增進網路效能。在這些技術中，其中以中繼技術最為重要。 中繼技術利用中繼站當作基地台與使用者間的中間節點，進行封包的解碼與轉送。因此中繼技術能提升訊號的訊雜比(signal-to-noise ratio, SNR)，降低封包的位元錯誤率(Bit-Error Rate, BER)。這將有助於延伸基地台的覆蓋範圍與提升使用者的傳送速率。有鑑於此優勢，IEEE標準委員會於2006年五月成立了IEEE 802.16j Relay工作群組，其負責由既有的IEEE 802.16-2004與IEEE 802.16e-2005標準為基礎，發展適合IEEE 802.16的中繼多點跳躍規範。 本篇論文根據IEEE 802.16j/D6a規格，並以WiMAX Forum應用架構工作群組 (Application Architecture Task Group, AATG) 所開發的WiMAX Network Simulator 2.5版為基礎，設計與實作三個二跳躍式(two-hop)中繼器模組：1) 資料叢(burst)傳送法穿透式中繼模組、2) CID資料傳送法穿透式中繼模組與3) CID資料傳送法非穿透式中繼模組，於ns-2網路模擬器上。所有模擬結果皆與IEEE 802.16e進行比較，本篇論文的結果將有助於評估IEEE 802.16無線寬頻都會網路使用中繼多點跳躍架構的優勢與缺點。 People have gradually familiar with using wireless network due to the fast growing wireless communication technologies. Broadband wireless access (BWA) technologies are developed for supporting fast, wireless, and ubiquitous mobile multimedia usages. Many enhanced technologies of wireless networks have been investigated and contributed by academic and industry over past decades. Among these new invented technologies, relay is the most important technology. Relay technology uses a relay station as an intermediate node between base station and user equipment. The relay station receives the packets and then decodes-and-forwards them. Hence, relay technology is able to increase the signal-to-noise ratio (SNR) of signal and decrease the bit-error rate (BER) of packet, it can also enhance the coverage ratio of the service area, or increase the transmission data rate. In the May of 2006, the IEEE 802.16j Task Group was officially established by IEEE Standards Association, which attempts to amend current IEEE 802.16-2004 and IEEE 802.16e-2005 standard in order to support multi-hop relay (MR) operations in the IEEE 802.16 network. In this thesis, we design and develop three two-hop relay modules: 1) Burst-based transparent module, 2) CID-based transparent module, 3) CID-based non-transparent module within Network Simulator 2 (NS-2) simulator. The design and implementation of these modules are based on the IEEE 802.16j/D6a draft (29 Jul. 2008) and WiMAX Forum Application Architecture Task Group (AATG) WiMAX Network Simulator version 2.5. All the simulation results are compared with IEEE 802.16e system. Therefore, the results can be used to evaluate not only the benefits but also the drawbacks of using the MR architecture in IEEE 802.16 network.
