Cell selection method and device in hierarchical cell structure

Abstract

The invention relates to a wireless communication system and discloses a cell selection method and equipment inside a layered cell structure to ensure that terminals can be more reasonably distributed inside layered cells of different levels. Through taking the duration of a DRX cycle as one of the factors selected within an HCS cell, the invention can more reasonably distribute each terminal in each layer of cells of the HCS. When other factors are not changed, a cell with larger coverage area is selected for a terminal with longer DRX cycle. According to the DRX cycle, cell selecting function can be realized inside network side equipment or a terminal. If the moving speed of a terminal is known, the DRX cycle and the speed of the terminal can be combined and are used as one of the factors selected inside the HCS cell.

Description

technical field [0001] The invention relates to a wireless communication system, in particular to a cell selection technique in a layered cell structure. Background technique [0002] The application of mobile communication in today's society is becoming more and more extensive, and the cell frequency coverage technology in mobile communication is also constantly improving. In the initial stage of mobile communication system application, because the traffic volume is not large, often a cell covers a relatively large area. With the increasing number of users, it is difficult for the system to meet the increasing traffic demand. At this time, a cell with a different frequency is often added in some areas to absorb the traffic. In this way, a situation occurs in which multiple different-frequency cells cover the same area. [0003] As the traffic volume continues to increase, the system will be further expanded in hot spots with very high traffic volume in actual situations, ...

AI Technical Summary

Problems solved by technology

If the DRX is very long, the terminal is likely to move to a new cell. If the terminal wakes up and finds that it has entered a new cell, it needs to initiate a cell update or forward handover. The faster the terminal moves, the size of the cell The smaller the value, the greater the probability of this situation, which makes the power-saving performance of the terminal not very good (every time it wakes up, it finds that it has moved to a new cell, thereby initiating cell update or forward handover, resulting in many Signaling interaction), and it is likely that the new cell entered by the terminal is already separated from the original cell by many cells, so handover cannot be performed, resulting in radio link failure and call drop

Images