Research On NB-IoT-D2D Communication Resource Allocation Based On Carrier Sense

With the exponential growth of smart devices such as smart homes,smart transportation,and public safety,as well as the rapid development of Internet of Things communication technologies,the capacity,delay,and security of existing networks are facing higher challenges.NB-IoT technology is now focused on the low-power wide-coverage(LPWA)Internet of Things(IoT)market.It is an emerging technology that can be widely used worldwide,with wide coverage,multiple connections,low cost,low power consumption,Excellent architecture characteristics.However,with the large-scale commercial use of NB-IoT technology working in authorized frequency bands,the explosive growth of services will lead to a significant increase in base station load,a sharp lack of spectrum resources,and a significant increase in transmission delay.However,D2 D communication technology is one of the key technologies of the existing cellular network,and has the advantages of improving the spectrum efficiency of the communication system and increasing the throughput of the cell.Therefore,in order to overcome the limitations of NB-IoT technology in various application fields and solve the problem of lack of spectrum resources,this paper studies a communication method that combines NB-IoT technology and D2 D communication technology,that is,NB-IoT based on carrier sensing IoT-D2 D communication resource allocation method.Its work content and innovations are as follows:1.Propose a carrier-sensing-based NB-IoT-D2 D communication resource acquisition method.This method improves the overall throughput of the system while ensuring that the interference of D2 D communication on cellular communication does not exceed the interference threshold.This method does not rely on the base station to coordinate the allocation of communication resources.By monitoring the RRC signaling of the base station,the idle state probability of the non-anchor carrier is obtained,the optimal non-anchor carrier for D2 D data transmission is selected,and by listening to the anchor carrier and The optimal non-anchor carrier selects idle resources for D2 D communication,effectively improving channel utilization.2.On the basis of the above method for acquiring D2 D communication resources based on carrier sensing,design a D2 D communication protocol based on the NB-IoT standard.On the basis of ensuring the normal communication of NB-IoT,the D2 D terminal directly obtains D2 D communication resources and establishes a D2 D communication connection.Since the NB-IoT terminal in the idle listening state resides on the anchor carrier,the D2 D terminal uses the NB-IoT anchor carrier as the request communication carrier and the optimal non-anchor carrier as the data transmission service carrier to realize the NB-IoT-based terminal.IoT D2 D communication,thus effectively alleviating the pressure on the number of cell access terminals.3.In order to verify the proposed NB-IoT-D2 D communication method based on carrier sensing,this paper builds an NB-IoT-D2 D communication system simulation model based on the LTE module in the NS3 simulation software,and uses D2 D communication to generate cellular users.Interference,system throughput,packet loss rate,average packet delay,and channel utilization are the performance metrics to evaluate the protocol.Under appropriate parameter configuration,the interference of D2 D communication to cellular users is within the interference threshold,and under the premise of ensuring the performance of cellular communication and D2 D communication,it can effectively improve the overall system throughput and channel utilization.