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Random Access Technology Research In Large-scale MTC

Posted on:2018-03-24Degree:MasterType:Thesis
Country:ChinaCandidate:X D GaoFull Text:PDF
GTID:2348330518996457Subject:Information and Communication Engineering
Abstract/Summary:PDF Full Text Request
With the development of Internet of Thing (IoT) technology,wireless communication technology will extend its tentacles to the wide area of Machine-to-Machine (M2M) communications. Machine-type Communications (MTC) is a new wireless communication type which supports the ubiquitous connection among machine devices based on Long Term Evolution (LTE) system. In the foreseeable future, along with the fact that a lot of new MTC application scenarios like smart home and unpiloted driving step into human life, the appearance of a huge amount of MTC devices will be inevitable. If the huge MTC devices volume are carried by traditional LTE system without any change, the LTE system will be heavily congested and have to face the disastrous impact in random access performance.In LTE communication system, random access is a basic function. User Equipment (UE) can establish wireless connection with the cell through random access easily and obtain uplink synchronization. An UE can transmit the uplink data only after successfully passing the random access. Based on LTE random access, this paper focuses on the research of large-scale MTC random access technology. The main contributions are as follows:First, through one-year track of 3GPP sub-topic evolved MTC (eMTC)random access technology standardization process, this paper analyzes,concludes and summarizes the latest technical specification detailedly in physical layer and Media Access Control (MAC) layer. In addition, based on the large-scale eMTC scene, this paper simulates the performance of Access Class Barring (ACB) filtering mechanism and analyzes the lack of it.Second, propose an Annulus-Based ACB (AB-ACB) strategy. In stationary MTC devices scene, it will cause severe random access overload problem for large-scale MTC devices to request random access simultaneously.In order to solve this problem, it is a proper way to introduce and improve ACB filtering mechanism. Based on a newly proposed random access procedure model for stationary device, this paper divides a LTE cell into several equal-width annuluses firstly, and then sets different ACB access forbidden parameters to different annuluses. Comparing to ACB scheme, this proposed strategy is more suitable for stationary MTC scene. This newly proposed AB-ACB strategy can further improve random access efficiency.
Keywords/Search Tags:Machine-type Communications, random access, Access Class Barring, random access overload
PDF Full Text Request
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