應用於立體視訊之智慧型通訊系統研究-子計畫三：抗干擾和高傳輸之智慧媒體接取技術研究( I )

Abstract

本計畫旨在提昇超微型基地台之媒介接取控制層（Medium Access Layer, MAC）與物理層（Physical Layer, PHY）之間跨層無線資源管理之效能，以期達成無線視訊傳輸所需十億位元（Gigabit）等級之傳送速度。本計畫針對超微型基地的無線資源管理所遭遇到的，以及MAC層軟體平台在實作驗證上的種種技術課題，分成以下幾個範疇加以研究：第一、MAC層相關的干擾減輕；第二、PHY層相關的干擾減輕；第三、以服務品質（QoS）為基礎的無線資源管理。第一與第二部份，分別就MAC與PHY兩個協定層的角度，處理干擾減輕（Interference Mitigation）的問題。干擾是目前超微型基地台系統研發當中，所遭遇到的首要技術問題。這是源自超微型基地台與大型基地台可能共享同一個有照頻段。再加上終端使用者自行佈建，使得訊號干擾的問題更難以控制。因此，干擾管理（Interference Management）技術具有極高的重要性。第三部份討論到行動多媒體服務所需求的服務品質，包括：高傳輸速率、低執行期間（Run-Time）延遲、低初始延遲、低錯誤率以及傳輸的穩定性。如何透過有限的無線資源，同時滿足這些需求，是以服務品質為基礎的無線資源管理機制（QoS-Based RRM）中最重要的設計議題。透過謹慎且慮及服務品質的MAC層緩衝區與重傳機制的設計，以及最佳化封包分配，超微型基地台將可有效支援廣播、多點傳播及單點傳播等各種不同的高畫質傳輸模式。 本計劃將分為三階段，於三年間執行。在第一年度，我們將建置一套多情境（Multi-Scenario）的系統層級模擬平台。藉此，我們將完成具有大型基地台、多個超微型基地台及用戶端裝置共存的效能分析。同時，我們將初步完成擬真原型機平台的實作。第二年度我們則於擬真平台之上，完成MAC軟體設計，並初步應用於多天線傳輸系統與移植到多核心平台進行驗證。第三年則參酌其他子計畫的規格，來完成最後無線資源管理系統的細部架構，並應用於多使用者環境。

The goal of this project is to improve the performance of MAC/PHY cross-layer radio resource management (RRM) on femtocells, so that the gigabit-level throughput required by wireless video transmission can be achieved. This project handles various technical issues encountered in the design of femtocell RRM, and in the implementation and verification of MAC layer software platform. The project will conduct research in the following areas. First, the MAC-related interference mitigation. Second, the PHY-related interference mitigation. Third, QoS-Based RRM. The first and the second part deal with interference mitigation issues from the angles of MAC and PHY, respectively. Interference is the most important technical problem in current development of femtocell systems. This problem results from potential spectrum sharing among macrocells and femtocells. In addition, the deployment of femtocells by end-users themselves can further make the interference problem uncontrollable. Therefore, the interference management technology is of great importance. The third part discusses the QoS criterion required by mobile multimedia services, including high throughput, low run-time latency, low initial delay, low error rate and good transmission stability. How to fulfill these requirements with limited radio resource is the most important design issue of QoS-Based RRM. Through careful, QoS-aware MAC buffer and retransmission mechanism designs, as well as optimized packet allocation, femtocells will be able to efficiently support high-definition video transmission modes such as broadcast, multicast and unicast. This project will be divided into three stages, and executed though three consecutive years. In the first year, we will build a multi-scenario system-level simulation platform. Meanwhile we will complete early implementation of the emulation prototype. In the second year, based on the emulation prototype, we will conduct early MAC software design, and port it to the MIMO-OFDM system and multi-core platform. In the third year, we will complete the final detailed architecture of RRM system with regard to other sub-projects’ requirements, and apply the integrated system to multi-user environment.