Td-scdma Micro Base Station Study On The Physical Layer Signaling Process And Implementation

TD-SCDMA is the third generation mobile communication standard proposed by China, who has the completely independent intellectual property. Because it adopts advanced technologies such as smart antennas, joint detection and synchronization CDMA, TD-SCDMA has outstanding advantages on the system capacity, spectrum efficiency and anti-jamming capability.TD-SCDMA network includes the core network and the wireless access network. The wireless access network equipments mainly include radio network controller (RNC) and base station (Node B). The base station system is mainly responsible for functions such as the RF signals transmitting/receiving, baseband signals processing, and data exchange with the RNC. The traditional base station is divided into macro Node B and micro Node B. Macro Node B have large capacity, size, power, and are applied to wider areas, while micro Node B are characterized by small capacity, size, and have great advantages at hot spot areas and indoor coverage areas. In TD-SCDMA network construction, there is a greater demand for micro Node B.The functionality micro Node B are required to realize is basically the same with the macro Node B (except for smart antennas, etc.). Micro Node B needs to complete process at the physical layer of the Iub interface and the Uu interface. The signal process of Micro Node B can be divided into processing and data processing, the object of signal processing is micro Node B NBAP signaling, and that of data processing is FP data.This paper mainly analyzes and researches the physical layer protocols and processing involved in the micro base stations, and proposes a DSP-based software implementation. The description bases on multi-community, multi-carrier micro Node B.The design of TD-SCDMA micro Node B needs to clear the demands in the first place. The relevant standards of TD-SCDMA brought by 3GPP provide the basic process flow of the micro Node B. Therefore, this paper analyzes and researches interface protocols involved in the micro Node B, including mainly the Iub interface and the Uu interface protocols, explores emphasizely the process flow, which relates to the physical layer of micro Node B, in the protocols, and clears the signal process flow in the physical layer of micro Node B.After Analyzing relevant protocols and determining relevant requirements, the paper introduces the overall program of the hardware structure and the physical layer software of TD-SCDMA micro Node B. The implementation of physical layer baseband functionality is based on DSP. In addition, the paper presents the signal process flow and the data process flow.The physical protocol process deals with all the NBAP signaling of 3GPP, provides required parameters for the physical layer subsystem, and transmits the corresponding signals for high layers. The signal process subsystem is a subsystem in the physical layer of micro Node B. The functionality of signal process subsystem is divided into three main modules: downlink signaling handling, local message maintaining, and uplink message reporting. This article also introduces the data structure of the physical layer.Finally, this paper proposes the test programs and implementation platforms of micro Node B. According to the relevant 3GPP test specifications, it designs the test case for micro Node B key process. The results show that micro Node B can accurately complete the major NBAP process.The micro Node B researched in this paper can achieve multi-sector, multi-carrier business process, and the number of sector and carriers can be flexibly configured. At hot spots, indoor coverage areas, and blind spots supplementing macro Node B, the design presented in this paper has strong competitiveness and greater market prospects.