Scheduling Algorithm Design And Implementation Of The Terminal Mac Layer Protocol In The TD-LTE Broadband Multimedia Cluster System

With the continuous development and progress of society,people's demand for communication has been improved.Especially for the era of mobile Internet,narrowband trunking technology can not meet the massive data and diverse characteristics.At the same time,with the rapid development of wireless high-speed data services,the broadband trunking system has become an inevitable trend.TD-LTE broadband multimedia trunking system combines trunking communication technology with TD-LTE technology,which can meet the needs of multiple service in broadband trunking system.With the rapid development of the cellular broadband access technology,LTE has been able to provide the peak rate 100 Mbit/s on the downlink,and 50 Mbit/s on the uplink.Making full use of the advantages of LTE technology,broadband trunking communication has enter a new era.In this paper,we study the trunking function on the MAC layer for user equipment in TD-LTE broadband multimedia system.According to the TD-LTE protocol,the upper and lower layers of the UE protocol stack of TD-LTE broadband multimedia trunking system and the software structure of MAC protocol software are determined.According to the software structure and function requirement of the UE MAC layer protocol,the detailed software design and implementation are mainly divided into three modules: random access control module,multiplexing and demultiplexing module,and scheduling module.These three module is correspond to three process in the MAC layer: the random access process,MAC PDU packaging and analysis as well as resource allocation in UE side for the logic channel.From the overall structure refinement step by step,the UE side MAC protocol software is gradually realized t.To reduce the interaction between RLC and MAC to achieve the data transmission process,combining the RLC protocol software with MAC layer software is considered.At the same time,the functional modules of MAC layer are tested and the performance of the system is tested to ensure the normal function of the software and the normal operation of the system.Finally,resource scheduling strategy in TD-LTE broadband multimedia trunking system,which is based on variety of priority including call type,service type,,user and group,is researched to ensure the order of resource and user scheduling.This strategy is different from other scheduling strategies based single strategy.