Access overload control method of RAN (Radio Access Network) layer in clustered M2M (Machine to Machine) network

Abstract

The invention discloses an access overload control method of an RAN layer in a clustered M2M network. The method comprises the following steps: (1) dividing MTC equipment in a base station into time delay sensitive equipment and time delay insensitive equipment according to a preset time delay sensitivity limit; (2) acquiring the quantity of users requesting to access in a current time slot by the base station, obtaining a corresponding pilot frequency partition ratio beta * when the total quantity of successfully accessed MTC equipment is maximum, and then acquiring the quantity of pilot-frequency resources allocated to the time delay sensitive equipment and the quantity of pilot-frequency resources allocated to the time delay insensitive equipment according to the corresponding pilot frequency partition ratio beta * when the total quantity of successfully accessed MTC equipment is maximum; (3) realizing user access by adopting an ACB mechanism according to the quantity of the allocated pilot-frequency resources by the time delay sensitive equipment, and realizing user access by adopting the ACB mechanism according to the allocated pilot-frequency resources by the time delay insensitive equipment. The method disclosed by the invention can be used for effectively increasing the access rate of the MTC equipment.

Description

technical field [0001] The invention belongs to the technical field of M2M communication, and relates to an access overload control method of a RAN layer in a clustered M2M network. Background technique [0002] When too many MTC devices are deployed in a certain area and are intensively connected to the network at the same time, the network will face overload and a possible surge in MTC traffic, and network congestion and overload will inevitably cause unnecessary time delay, packet loss, and even service interruption. For network congestion and overload in M2M communication, the existing ACB strategy itself is not flexible enough. When the number of users to be accessed further increases, it is difficult to effectively reduce the collision probability and it is not easy to achieve a compromise between various performances by adjusting related parameters; In addition, the ACB strategy is only applicable to those devices that are not sensitive to the delay. In practice, the...

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Problems solved by technology

[0002] When too many MTC devices are deployed in a certain area and are intensively connected to the network at the same time, the network will face overload and a possible surge in MTC traffic, and network congestion and overload will inevitably cause unnecessary time latency, packet loss, and even service interruption

For network congestion and overload in M2M communication, the existing ACB strategy itself is not flexible enough. When the number of users to be accessed further increases, it is difficult to effectively reduce the collision probability and it is not easy to achieve a compromise between various performances by adjusting related parameters; In addition, the ACB strategy is only applicable to those devices that are not sensitive to delay. In practice, the existence of delay-sensitive devices limits the application of the ACB strategy.

At the same time, although the EAB strategy takes delay-sensitive devices into consideration, it does not implement grouping of pilot resources, causing two types of users to share fixed pilot resources. This processing method will inevitably lead to poor access for low-priority users To be fair, in view of the above problems, it is necessary to dynamically set the pilot partition ratio for the M2M network under the cluster structure with delay sensitivity as the standard, so as to maximize the access rate of MTC devices, but the existing technology does not involve this aspect Technology

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