The design and implementation of Super Base Station side L1C system in TD-LTE pattern
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The Super Base Station project was proposed by the Institute of Computing Technology, Chinese Academy of Sciences. The super base station of Centralized architecture can integrate multimode mobile communication system, save operator costs, reduce energy consumption, increase the transmission rate. The physical layer protocol has not explicitly stated the various states of physical layer as well as the interface with high-level in 3GPP LTE standard specification, so the physical layer control (L1C) solution was designed and implemented, mainly responsible for achieving high-level interactive information, data movement, and start physical channel. The physical layer baseband processing is based on TMS320TCI6618 multi-core DSP, where L1C system is located on core0, and core1, core2 are respectively used for processing uplink and downlink data signal. This article defines the three states of the physical layer, boot and other configuration scheduling process on the base station side is actualizes by state transition. When the subframe scheduling is going, through the multi-task scheduling and double buffering double pointer technology of the DSP, data storage and transfer is completed properly, and the startup and shutdown of different channels is completed according to different criteria. Stipulate the interface content with Protocol Stack, and communicate with it through the Ethernet port, multi-core DSP use IPC for the inner communication and regulate. Verification process is divided into two parts, numerical comparison and link level simulation. Data comparison is performed through a packet capture software omnipeek verify that no packet loss. After the deployment of the physical layer control use the manner of breakpoints debug and memory viewer to observe, data which has throughed the IPC also correct. The whole process of link is a Video transmission, through the software decoding, the base station side downstream transmission protocol stack, physical layer, and the physical layer of terminal receives, protocol stack. Finally through store, the Video can play out by original software. Entirety test correct, transfer content freedom from error, no conflict with other modules.