Cell Reselection Parameters for Heterogeneous Network Efficiency
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Solution Overview
Problem
In heterogeneous cellular networks, the existing cell reselection methods in LTE networks fail to efficiently manage transitions between macro and low power node cells, leading to radio link failures, ping-pong reselection, and power inefficiency due to inadequate time parameters for cell reselection.
Innovation Solution
A method where a base station broadcasts additional indication information allowing user equipment to determine whether a target cell is a low power node, using specific reselection parameters to adjust cell reselection time based on mobility state and evaluation factors, thereby improving efficiency and reducing ping-pong reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large Treselection value is configured for heterogeneous network, then macro cell coverage is maintained, but cell reselection to low power nodes is delayed causing radio link failures and paging reception failures
Solution Approach 1:
The patent applies local quality by configuring different reselection time parameters for different cell types. Specifically, Treselection-LPN is configured separately for low power node cells, while Treselection is used for macro cells. This allows optimized reselection timing for each cell type based on its specific characteristics, resolving the contradiction between maintaining macro cell reliability and enabling timely reselection to low power nodes.
2Speed
If a small Treselection value is configured for heterogeneous network, then cell reselection to low power nodes is faster, but ping-pong reselection occurs between macro cells causing power consumption increase
Solution Approach 1:
The patent implements local quality by introducing cell-type-specific reselection parameters. Treselection-LPN is applied when reselecting to low power node cells, enabling faster reselection without affecting macro cell reselection behavior. This prevents ping-pong effects between macro cells while allowing rapid access to low power nodes, thus resolving the contradiction between reselection speed and power consumption.
3Device complexity
If a single Treselection value is broadcast for all cells, then network configuration is simple, but it cannot accommodate different reselection requirements of macro and low power node cells
Solution Approach 1:
The patent applies segmentation by dividing the reselection time parameter into two distinct configurations: Treselection for macro cells and Treselection-LPN for low power node cells. The base station separately configures and broadcasts these parameters, allowing independent optimization for each cell type. This resolves the contradiction between configuration simplicity and parameter adaptability by organizing complexity in a structured, manageable way.
4Reliability
If Tevaluate is used for cell reselection in heterogeneous network, then reselection follows standard procedure, but evaluation time is too long (at least 5s) causing radio link failures and paging reception failures
Solution Approach 1:
The patent applies parameter changes by introducing a new reselection time parameter specifically for low power node cells (Treselection-LPN). This parameter allows the network to configure appropriate reselection timing for low power nodes without being constrained by the standard Tevaluate minimum of 5 seconds. By changing the relevant parameter for the specific cell type, the patent resolves the contradiction between connection reliability and reselection timing.
Data Source
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AI summary
Embodiments of the present invention provide a cell reselection method, device, and system, where the method includes: receiving a broadcast message that is sent in a first cell by a base station, where the broadcast message includes information about a set of second cells; when it is determined, according to the information about the set of the second cells, that a target reselection cell is a second cell, determining, according to second-cell reselection parameter information, time for performing cell reselection; or when it is determined, according to the information about the set of the second cells, that a target reselection cell is not a second cell, determining, according to first-cell reselection parameter information, time for performing cell reselection. In the embodiments of the present invention, a base station is capable of adding new indication information to a broadcast message, and a user equipment determines, according to the indication information, whether a target cell is a low power node, so as to determine time for cell reselection, thereby improving cell reselection efficiency or reducing ping-pong cell reselection to save power.