Dynamic Cell Aggregation for Unlicensed Band Interference
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Solution Overview
Problem
Wireless communication systems face inefficiencies in transmitting and receiving radio signals, particularly in Carrier Aggregation (CA) based systems, where securing available resources in unlicensed bands is challenging due to interference and resource competition from other communication systems like Wi-Fi, leading to potential deterioration of user equipment (UE) transmission performance.
Innovation Solution
A method and apparatus for a user equipment (UE) in a wireless communication system that selectively aggregates UCells based on cell aggregation capability, prioritizing UCells with lower indices and wider system bandwidths, and dynamically configures resource reservation periods to efficiently secure resources, reducing frequency switching and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE aggregates multiple UCells in unlicensed bands to increase resource availability, then the resource utilization improves, but the interference and resource competition from other communication systems worsens
Solution Approach 1:
The patent implements dynamic Cell Aggregation where the UE can flexibly adjust the number and configuration of aggregated UCells based on real-time channel conditions and interference levels. The aggregation configuration is not fixed but can be modified through L1 signaling to adapt to changing environmental conditions, allowing the system to optimize resource utilization while managing interference dynamically
Solution Approach 2:
The patent changes the parameter of cell aggregation configuration by receiving L1 information that dynamically adjusts the number of aggregated UCells (M ≤ N) and their specific configurations. This parameter adjustment allows the system to optimize between resource utilization and interference management by selecting appropriate aggregation levels based on current channel conditions
2Adaptability or versatility
If the UE frequently switches frequency to access available resources in unlicensed bands, then the resource availability improves, but the transmission performance deteriorates due to switching overhead
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple UCells with different frequency resources before transmission occurs. The UE receives L1 information that prepares the aggregation configuration in advance, allowing it to quickly access available resources without frequent mid-transmission frequency switching, thus maintaining transmission performance while ensuring resource availability
3Productivity
If the UE aggregates more UCells to increase bandwidth, then the data transmission capacity improves, but the device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously manage cell aggregation based on received L1 information. The UE automatically selects and configures the appropriate number of UCells (M ≤ N) and their aggregation parameters without requiring complex manual configuration or higher-layer protocol intervention, thus increasing data transmission capacity while keeping device complexity manageable
Data Source
AI summary
The resent invention relates to a wireless communication system, and particularly to a method and device for same, the method including the steps of: receiving, from a base station, L1 information about M number of UCells (M≤N) on which downlink resources are temporarily configured, wherein M number of UCells (M≤N) are a subset of N number of UCells; selectively aggregating K number of UCells (K<M) from among N number of UCells depending on a terminal's cell aggregation capability; and communicating with the base station by using the aggregated K number of UCells.