A cell reselection method, apparatus and terminal

Abstract

The invention discloses a cell reselection method. A cell reselection signal offset is determined by a terminal according to the randomization algorithm, and cell reselection measurement and / or cell reselection judging processing is performed by means of the cell reselection signal offset. The invention simultaneous discloses a cell reselection apparatus and terminal.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a cell reselection method, device and terminal. Background technique [0002] Long Term Evolution (LTE, Long Term Evolution) is a wireless communication 4G technology developed by the Third Generation Partnership Project (3GPP, The 3rd Generation Partnership Project). With the widespread deployment of LTE, attracting the influx of a large number of smart terminals, it can be expected that more and more LTE terminals will reside and perform services in the network; in order to meet the rapidly growing number of users and business needs, in the network Deploying multiple carriers to offload users and services is a common solution used by operators. For load balancing of terminals in connected state, the terminals can be distributed to different cells of different carriers through mechanisms such as load information interaction, dual link, handover, and redirection. Howe...

AI Technical Summary

Problems solved by technology

[0003] 1) The existing cell reselection mechanism based on public different frequency priorities may cause all idle terminals to concentrate on the highest priority carrier, which may lead to a rapid increase or overload of the high priority carrier load, thereby affecting system performance and user experience ,like figure 1 As shown, the frequency 1 of cell 1 has a high priority, and is currently in a state of heavy load, but the terminal in the idle state may still reselect to cell 1;

[0004] 2) The existing cell reselection mechanism based on the same common frequency priority may still cause a large number of terminals in similar locations to flood into the same carrier, resulting in a rapid increase or overload of the carrier load, thereby affecting system performance and user experience, such as figure 2 As shown, the frequency priority of Cell 1, Cell 2, and Cell 3 is the same, but a large number of terminals in similar locations may simultaneously flood into Cell 3 with a light load;

[0005] 3) The existing cell reselection mechanism based on the same common frequency priority needs to coordinate reselection parameters between cells, otherwise it may cause cell reselection ping-pong, resulting in increased terminal power consumption and decreased user experience;

[0006] 4) The cell reselection mechanism based on the dedicated priority cannot adapt to the characteristics of the carrier's service load changing with time and the location of the terminal, so that it cannot realize the reasonable distribution of terminals among the carriers; the signaling load brought by dynamic update of the dedicated priority May also affect system performance

In the scenario where multiple cell types coexist, considering the diversity of load conditions and small coverage of small cells, blindly directing terminals to small cells may make terminals unable to access or increase power consumption, thereby affecting user experience; On the other hand, using small cells as much as possible is also the original intention of operators to deploy small cells

However, the existing LTE idle state cell reselection mechanism is difficult to well control the idle state terminal camping on the small cell, such as image 3 As shown, for example: once the frequency priority of a small cell such as cell 3 is increased or the frequency or cell offset of cell 3 is set to a value that tends to allow the terminal to reselect to cell 3 (for example, the offset is set to a negative value) , it will cause all terminals in the coverage area to be reselected to cell 3, potentially causing access problems and affecting the service experience in the subsequent connection state, etc.

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