Application Research Of WDM-PON Technology In Mobile Fronthaul

With more and more intelligent communication terminal equipments being applied in the network,mobile network services are showing an exponential growth trend,and the mobile fronthaul network as a C-RAN transmission network is facing a very huge data transmission pressure.And in order to be able to satisfy the end-user experience of the radio access network,it is necessary to increase the coverage and bandwidth capacity of the entire mobile network and reach the full geographic coverage of the mobile Internet.At this point,a promising transmission network system that meets the requirements is needed to carry the mobile forward network,and WDM-PON is a feasible solution.Firstly,the thesis analyzes the requirements of mobile fronthaul network transmission,and lists five currently promising mobile fronthaul bearer solutions: optical fiber direct drive,passive color light,active OTN/WDM,TDM-PON,and WDM-PON.WDM-PON can meet the current and future needs of mobile fronthaul networks in terms of bandwidth requirements,delay jitter,capacity expansion,and security.It can also use existing PON resources to provide it with certain economic benefits;Secondly,it studies the WDM-PON wavelength allocation method of the fronthaul network.The fixed wavelength allocation method uses the wavelength sharing method to increase the bandwidth utilization and reduce the system cost when carrying the mobile fronthaul network with low bandwidth utilization,high fiber resource consumption,high system cost,and can not meet the QoS of user service differences.In this way,the appropriate wavelength allocation algorithm is used to satisfy the fairness of different users of the mobile network and their uplink and downlink transmissions.A DBA algorithm based on cell average traffic is proposed.Through simulation,a comparative analysis of the transmission delay performance of the static sequential wavelength allocation algorithm and the new algorithm.Compared with the SSA algorithm,the new algorithm has better uplink and downlink average transmission delay performance,ensures fairness of user uplink and downlink transmission,and brings relatively small system delay when the number of ONUs increases.When the network is expanded,Increase the number of shared wavelengths to achieve lower system transmission delays.The new algorithm is more suitable for mobile fronthaul networks,and can better meet the transmission requirements of mobile users.;Finally,the energy-saving mechanism of WDM-PON system for mobile fronthaul network is studied.First,an energy-saving mechanism based on the S-WDM-PON system is proposed.By turning off the corresponding transceivers during off-peak hours to achieve energy saving,a simple estimation of the energy consumption of the S-WDM-PON system with 16 ONUs can be achieved,achieving 22% The energy saving rate.Secondly,introduces the ONU hibernation mechanism of WDM-PON and proposes a CAT-based ONU hibernation mechanism.It is found that this mechanism can effectively guarantee the QoS of LTC users while achieving energy saving,and can effectively avoid the extra delay caused by frequent handovers.And energy consumption.In addition,according to actual forward network transmission requirements,the balance between energy saving and user QoS can be achieved by changing the standard sleep time and transition probability.