Method and device for selecting cell under DRX (Discontinuous Reception) state in HetNet system

Abstract

The invention discloses a method and a device for selecting a cell under a DRX (Discontinuous Reception) state in a HetNet system. An access network sets a HetNet level for each cell and the HetNet level is broadcasted to a user, and the user receives a message and stores the message in the terminal; each base station judges whether the activity of a data packet in a time period for the user in a connected state is lower than a certain threshold value, if yes, a DRX mechanism is used, and DRX modeling analysis is carried out; with a cost function value to be minimal as a principle, a DRX cycle length is allocated for each user; in consideration of the user speed and the DRX cycle length, a monotone function value is calculated, and a cell HetNet level value corresponding to a different value is judged; and finally, according to the obtained neighbor cell HetNet level information in need of measurement, the user measures a neighbor cell meeting requirements, and the best target cell is selected for switching. The method and the device of the invention have the advantages of reducing signaling interaction between a network side and the user terminal, reducing user power consumption, prolonging the service life of the terminal, and effectively reducing the handover failure rate, the wireless link failure rate and the ping-pong rate during the handover process.

Description

technical field [0001] The invention relates to a method and device for cell selection in DRX state in an LTE-AHetNet system, and belongs to the research field of radio resource management in a mobile communication system. Background technique [0002] In the deployment scenario of LTE-AHetNet, if a connected user moves from one cell to another, the network needs to switch the user from the source cell to the target cell. The key step is to select the The best target cell is served, and then the handover procedure is performed. Cell selection effectively balances the load between macrocells and low-power nodes, improving the performance of the entire system. [0003] During the handover process, the mobility measurement of the user in the connected state is controlled by the network side. Specifically, when a mobile user sends a handover request to the network side, the network side sends a dedicated measurement control command to the user, including parameters such as mea...

AI Technical Summary

Problems solved by technology

However, the DRX mechanism will have the following problems: if the DRX is very long, the user may move to a new cell. At this time, if the user wakes up and finds that he has entered a new cell, he needs to initiate a cell update or forward handover. Fast, the smaller the size of the cell, the greater the probability of this situation, which makes the power saving performance of the user not very good (every time you wake up, you will find that you have moved to a new cell, thereby initiating cell update or forward handover, resulting in a lot of signaling interaction), and it is very likely that the new cell entered by the user is already separated from the original cell by many cells, so handover cannot be performed, resulting in wireless link failure and call drop

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