Cell Handover Using Common Search Space Preconfiguration
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing handovers between cells, particularly in non-terrestrial networks where satellites move relative to user equipment, leading to disruptions and inefficiencies in maintaining stable connections.
Innovation Solution
The implementation of a handover procedure that involves establishing a connection with a serving cell, receiving an indication of a common search space configuration for a target non-serving cell, and performing a handover based on beam switch commands or transmission configuration indications, allowing seamless transitions without resetting control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used in non-terrestrial networks, then connection switching between cells is achieved, but connection stability deteriorates due to satellite movement and signal disruptions
Solution Approach 1:
The patent applies preliminary action by pre-configuring the target cell's common search space parameters before the actual handover occurs. The network entity configures the target cell's search space with appropriate parameters in advance, so that when handover is needed, the user equipment can immediately use the pre-configured parameters without delay, thereby improving connection stability during satellite movement.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network entity acts as a mediator between the source cell and target cell during handover. The network entity coordinates the handover process by managing the common search space configuration and ensuring seamless transition, reducing the complexity of direct user equipment to satellite coordination.
2Productivity
If handover procedures reset control information, then connection switching is simplified, but communication efficiency deteriorates due to redundant reconfiguration
Solution Approach 1:
The patent applies the discarding and recovering principle by selectively retaining useful control information during handover. Instead of completely resetting all control parameters, the system discards only the outdated source cell configuration and recovers/reuses the pre-configured target cell parameters from the common search space, thereby avoiding redundant reconfiguration and reducing handover time.
Solution Approach 2:
The common search space is pre-configured with target cell parameters in advance, so that during handover the user equipment can immediately access and use these pre-prepared parameters without waiting for real-time configuration, significantly reducing handover time and maintaining communication efficiency.
3Ease of operation
If common search space configuration is shared across cells, then mobility management is simplified, but search space collision risk increases
Solution Approach 1:
The patent applies local quality by customizing the common search space configuration for each target cell while maintaining the overall simplicity of shared configuration management. Each cell's search space is configured with cell-specific parameters (such as cell ID, frequency, and timing) to avoid collisions, while the general structure remains simplified for ease of mobility management.
Data Source
AI summary
Methods, systems, and devices for method for wireless communication are described. A user equipment (UE) may establish a connection with a serving cell of a network entity, where the network entity supports a set of cells including the serving cell. In some examples, the UE may receive an indication of a common search space configuration associated with a target non-serving cell of the network entity and may also receive a control signal including an indication to perform a handover procedure. The UE may then perform the handover procedure to switch the connection from the serving cell of the network entity to the target non-serving cell of the network entity based on receiving the control signal and the common search space configuration associated with the target non-serving cell of the network entity.