An access method for joint node clustering and data caching in narrowband Internet of Things

Abstract

The invention discloses an access method for joint node clustering and data buffering in narrowband Internet of Things. The method is carried out in the following steps: (1) the base station divides the cell nodes into three levels according to the coupling loss, and divides the nodes of the same level according to The space position is divided into M clusters, combined with the distribution of nodes in each cluster, a special node is selected for each cluster as a relay node with caching function; (2) Divide a single time slot access preamble into two parts, denoted as K 1 、K 2 , divide an access period into two parts, denoted as T 1 , T 2 ; (3) Ordinary nodes choose to send K 1 The leader accesses the relay node, caches the node information to the relay node, and caches T 1 After the slot, the relay node sends K by selecting 2 Lead access base station, send cached information to base station, complete uplink synchronization from common nodes to base station; (4) calculate access success rate, determine lead resource and access time slot in step (2) when maximum access rate is reached the best division method.

Description

technical field [0001] The invention relates to the field of node random access in the narrowband Internet of Things, in particular to a random access method of node clustering, relay node caching, and relay access in the narrowband Internet of Things. Background technique [0002] Narrowband IoT is a cellular IoT technology produced as an IoT service for low-power wide-area coverage. Its advantages lie in deep coverage, low terminal power consumption, low cost, and support for large-scale connections. Narrowband IoT technology has a wide range of applications, and its main services are divided into periodic upload services, event-triggered services, software update / update configuration services, and network command services. [0003] Narrowband IoT supports the deployment of tens of thousands of terminals in a single cell. In view of its narrowband system characteristics, the maximum access channel frequency band is only 180KHZ, and it adopts a unique frequency hopping prea...

AI Technical Summary

Problems solved by technology

If a preamble is selected by multiple terminals, access conflicts occur when these terminals send the preamble, and the base station cannot judge the terminal information, so it cannot send a random access response to the terminal, resulting in continuous access failures, and the access success rate is extremely low. Low

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