ion results of various data services at different mobility are shown in Figure 2.9. It is proved by simulation that the FuTURE TDD radio transmission link can support more than 100-Mb/s data rate transmission. Meanwhile, support- ing high vehicle speed (250 km/h) with large delay spread (10 us) is required. At the same time, the B3G link can provide reliable transmission for a large scale of high data rate transmission. 2.2.2.3 Layer 2 and Layer 3 Techniques The FuTURE TDD system has proposed a series of innovations in the field of radio resource management and has obtained many achievements in the technology of resource allocation and management for next-generation wireless communication systems based on the basic theories of extension set, fuzzy set, game theory, and joint optimization. Such achievements are mainly concentrated in the aspects of high-efficiency frequency reuse strategy, access control strategy for multiantenna systems, and cell edge user performance improvement. Physical layer (PHY) techniques establish a high-speed radio transmission plat- form, while radio resource management (RRM) techniques ensure high reliability and high efficiency for radio transmission. The target for RRM design is to provide the highest system capacity and data throughput through optimizing limited radio resources. The main issue is to investigate efficient QoS-oriented resource allocation strategies to optimize jointly the usage of radio resources, such as time, frequency, © 2009 by Taylor & Francis Group, LLC Long Term Evolution: GPP LTE Radio and Cellular Technology space, and power. Radio resource management algorithms should support various classes of traffic while guaranteeing their required QoS. The basic requirements to MAC layer include: support of TDD evolution and compatible TDD/FDD hybrid systems; support of a much higher data rate; support of much higher spectrum efficiency; support of a wide range of QoS and mobility; reasonable complexity and cost; and trade-off between backward compatibility and perform