Research On UE Power Saving For Air Interface Technology In 5G MMTC

The birth of 5th Generation Mobile Communication System(5G)has greatly expanded the scope of communication connections.With the commercialization of massive Machine Type of Communications(mMTC),the demand for low power consumption is increasing in various industries,so it is of certain practical significance to optimize User Equipment(UE)power consumption reasonably.The 3rd Generation Partnership Project proposed the key power-saving technology of Discontinuous Reception(DRX),which is mainly applied for the periodic transmission of downlink data and can effectively suppress the increase in terminal power consumption.In order to meet UE power consumption requirements of delay and reliability sensitive and non-sensitive business in mMTC,the DRX mechanism of the main energy consumption state RRC?CONNECTED can be optimized.In summary,the main research contents of the thesis are as follows:1.For delay and reliability sensitive business in mMTC,such as conversational voice,a DRX optimization scheme based on the dynamic parameters adjustment of 5G Qo S Identifier(5QI)is proposed in this thesis.According to the standard flow model and the three-state semi-Markov model,the power saving factor and the average waiting delay performance are derived,and the simulation analysis is performed.The simulation results show that,the optimized solution is better than ACTIVEDRX and meets the requirements of delay and reliability sensitive business.2.In order to further meet the needs of delay and reliability-sensitive business,a DRX optimization scheme based on the flexible frame structure is proposed in this thesis.The scheduling unit of DRX parameters of the optimization scheme depends on the variable ?.The DRX Markov model was Established and the performance indicators were described in index 1.Meanwhile,the effect of different ? values on the performance were simulated and analyzed.The simulation results show that,as ? increases,DRX power saving and waiting delay performance both decrease.In order to meet the needs of delay and reliability-sensitive business,it is feasible to trade off shorter delays at the expense of some energy.3.For non-sensitive delay and reliability services in mMTC,such as smart meter reading,a long-period dynamic extension DRX optimization scheme that restricts sbusiness delay and disables short-period is proposed.The long-period expansion of this optimization scheme is constrained by the business delay threshold and scheduling factor ?.In order to adapt to delay and reliability non-sensitive business,a simplified standard traffic model is used.There is only one packet in a packet call.According to the flow model and the semi-Markov model based on the long period,the performance index 1 is derived and simulated.The Simulation results show that,the optimized scheme has better time delay and power saving ability than the standard DRX scheme.