Wireless Terminal Beam Set Configuration for Signaling Overhead Reduction
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Solution Overview
Problem
Current mobile communication systems face challenges in supporting high-speed data services due to resource shortages and increased user demands for higher transfer rates, a large number of connections, low latency, and energy efficiency, necessitating advanced techniques such as small cell enhancement, dual connectivity, and non-orthogonal multiple access.
Innovation Solution
A method for a terminal to receive a downlink channel by a base station involves transmitting information about transmission beams for beam scanning, grouping beams into sets, and allocating specific resource regions, with pre-configured beam sets for seamless communication, using Radio Resource Control and Medium Access Control signaling, and Quasi-co-location information based on CSI-RS and DMRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam scanning operation is performed to determine optimal beam pairs for downlink channel reception, then signal transmission efficiency is improved, but information overhead increases due to beam indication signaling
Solution Approach 1:
The patent segments the beam indication process into two parts: (1) pre-configuring multiple beam sets with different beam combinations, and (2) indicating only the selected beam set index rather than all individual beam parameters. This segmentation reduces signaling overhead while maintaining the ability to indicate precise beam pairs for optimal signal transmission.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple beam sets containing various beam pair combinations before actual downlink channel reception. The terminal and base station prepare these beam sets in advance, so that during operation, only a simple beam set index needs to be indicated rather than full beam parameters, thereby reducing information overhead while ensuring optimal beam pairs are available for efficient signal transmission.
2Adaptability or versatility
If multiple beam sets are configured for downlink channel reception, then beam selection flexibility is improved, but device complexity increases due to additional configuration management
Solution Approach 1:
The patent segments beam configuration into hierarchical levels: beam sets (groups) and individual beams within sets. This segmentation allows flexible beam selection at the set level while simplifying individual beam management, as beams are pre-organized within sets according to specific criteria such as spatial directions or use cases.
Solution Approach 2:
The patent creates universal beam sets that can serve multiple purposes and scenarios. Each beam set contains beam pairs that can be used for different downlink channels and various communication conditions, making the configuration adaptable to different situations without requiring separate configurations for each scenario, thereby reducing overall device complexity.
3Productivity
If beam set indication is transmitted through MAC layer signaling, then signaling efficiency is improved, but reliability decreases compared to RRC layer signaling
Solution Approach 1:
The patent uses RRC layer signaling to pre-configure beam sets with high reliability, establishing a solid foundation before dynamic operations. Then MAC layer signaling is used for efficient beam set indication during actual channel reception. This preliminary configuration ensures that even if MAC signaling is lost, the terminal has pre-configured beam sets to fall back on, maintaining reliability while achieving signaling efficiency.
Solution Approach 2:
The patent implements beforehand cushioning by configuring default beam sets through reliable RRC signaling in advance. These default configurations act as a safety cushion, ensuring that if MAC layer beam indication signaling is lost or fails, the terminal can still receive downlink channels using the pre-configured default beam sets, thereby maintaining signaling reliability while allowing efficient MAC layer operation.
Data Source
AI summary
A method for receiving a downlink channel by a terminal in a wireless communication system and a device therefor. More particularly, a method includes: receiving, from a base station, configuration information relating to a plurality of transmission beams of the base station, wherein the configuration information includes configuration items with respect to one or more beam sets including the plurality of transmission beams; receiving information indicating any one beam set among the one or more beam sets from the base station; and receiving a downlink control channel from the base station based on the indicated beam set, wherein, if the information indicating any one beam set is not received from the base station, the downlink control channel can be received based on a pre-configured beam set among the beam sets.