SSB Configuration for Unlicensed Band Interference Management
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Solution Overview
Problem
The increasing demand for wireless data traffic in 5G communication systems, particularly in unlicensed frequency bands, poses challenges in maintaining communication quality due to interference with existing devices and the need for efficient channel sharing mechanisms.
Innovation Solution
A method for transmitting downlink signals and channels in a wireless communication system, where a terminal receives synchronization signals and PBCH blocks from a base station, and transmits uplink channels based on specific SSB candidate sets configured for different subcarrier spacings, ensuring efficient beam sweeping and channel allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If unlicensed frequency bands are used to meet increasing wireless data traffic demand, then data transfer capacity is improved, but interference with existing devices and communication quality deteriorate
Solution Approach 1:
The patent applies preliminary action by performing LBT (Listen Before Talk) channel access procedures before transmitting downlink signals. The base station senses the channel for a duration of at least one slot before transmission, and configures SSB candidate sets in advance with specific symbol positions and subcarrier spacing parameters, enabling terminals to prepare for reception without experiencing interference from unsynchronized transmissions
Solution Approach 2:
The patent implements dynamics by making the SSB configuration adaptable to different subcarrier spacing values (15kHz, 30kHz, 60kHz, 120kHz, 240kHz). The base station dynamically configures the number of SSB candidates, their symbol positions, and beam sweeping patterns based on channel conditions and traffic requirements, allowing the system to optimize performance across varying operational scenarios in unlicensed bands
2Adaptability or versatility
If channel sharing mechanisms are implemented in unlicensed bands, then coexistence with existing devices is improved, but channel allocation efficiency deteriorates
Solution Approach 1:
The patent applies parameter changes by configuring SSB candidate sets with specific subcarrier spacing values (15kHz, 30kHz, 60kHz, 120kHz, 240kHz) and adjusting the number of SSB candidates based on the channel access category. The base station modifies transmission parameters including symbol positions, beam sweeping patterns, and resource allocation based on LBT outcomes and channel conditions, achieving both coexistence and efficiency
Solution Approach 2:
The patent implements feedback mechanisms where the base station performs LBT channel sensing, receives channel access category information, and adjusts SSB configuration accordingly. The system uses feedback from channel conditions and traffic requirements to optimize the number of SSB candidates, their positioning, and beam management parameters, balancing coexistence requirements with allocation efficiency
3Length of moving object
If beamforming and massive MIMO are used to alleviate path loss in mmWave band, then transmission distance is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the beam management process into discrete SSB candidate sets with specific symbol positions and beam directions. Each SSB candidate represents a specific beam direction or transmission configuration, allowing the system to manage multiple beams through structured, segmented resource allocation rather than continuous complex beamforming operations
Solution Approach 2:
The patent uses parameter changes by configuring different subcarrier spacing values (15kHz to 240kHz) and adjusting SSB candidate parameters based on frequency band and transmission requirements. This allows the system to adapt beamforming complexity to match the specific operational scenario, using simpler configurations when possible and more complex arrangements only when needed for mmWave transmission distance extension
Data Source
AI summary
A method, performed by a terminal, for receiving a downlink signal and channel in a wireless communication system comprises the steps of: receiving a synchronization signals and PBCH block (SSB) from a base station; and transmitting an uplink channel to the base station on the basis of the SSB.