System Information Change Indicator for Interference Mitigation
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Solution Overview
Problem
The increasing density of small-sized cells and relay nodes in next-generation mobile communication systems leads to increased interference, necessitating the restriction of uplink and downlink physical channels, but existing systems lack efficient procedures for varying system information to mitigate this interference.
Innovation Solution
A method is proposed where a macro cell or small cell can transmit instructions to a UE to restrict uplink/downlink transmission during specific sub-frames or radio frames, and when small cells need to be turned on or off, system information can be efficiently changed and managed by receiving an indicator and applying it after a specified interval, allowing for changes in system bandwidth, carrier frequency, and other parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If small-sized cells and relay nodes are added to increase network density, then coverage and capacity are improved, but interference between cells increases
Solution Approach 1:
The patent implements periodic action by enabling small cells to be dynamically turned on and off in a periodic manner. The base station receives indication information that specifies time periods during which small cells should be restricted or turned off to mitigate interference. This periodic activation and deactivation allows the system to maintain network coverage while reducing interference during specific time intervals, directly addressing the contradiction between increasing network density and managing inter-cell interference.
2Object-affected harmful factors
If small cells are turned on or off to mitigate interference, then interference is reduced, but system information needs to be changed frequently
Solution Approach 1:
The patent applies the extraction principle by separating the system information change indication from the actual system information content. The base station sends dedicated indication information (such as a flag or specific message) that separately notifies the terminal about upcoming system information changes. This extraction allows the terminal to prepare for changes without immediately processing the full system information, simplifying the management complexity while enabling dynamic on/off switching of small cells to mitigate interference.
Solution Approach 2:
The patent implements preliminary action by notifying the terminal in advance about system information changes before they actually occur. The indication information is sent ahead of time, allowing the terminal to prepare for the upcoming changes in system information. This preliminary notification reduces the complexity of handling frequent changes, as the terminal can proactively adjust its configuration rather than reacting to changes after they occur, thereby simplifying system information management while enabling dynamic interference mitigation.
3Adaptability or versatility
If system information is changed frequently to adapt to small cell on/off states, then adaptability is improved, but terminal processing complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of indication information that acts as a mediator between the base station and the terminal. Instead of directly changing system information frequently, the base station uses the indication information to signal upcoming changes. This intermediary layer simplifies terminal processing by providing clear, structured notifications that tell the terminal when and what kind of changes to expect, reducing processing complexity while maintaining high adaptability to small cell on/off states.
Data Source
AI summary
According to one disclosure of the present specification, a method for applying system information changed in a terminal is presented. The method for applying the changed system information includes the steps of: receiving an indicator providing notice of a change of a system information set from a cell; receiving information on the time when the change of system information is applied; when the indicator is received in subframe n, determining that the changed system information is applied after k periods based on the information from the n subframe.