Common Beam for PDSCH Reduces Beam Management Latency
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Solution Overview
Problem
Current wireless communication systems, such as 5G NR and LTE, face challenges in reducing beam management latency and overhead, particularly in supporting higher intra-cell and inter-cell mobility, and improving latency and reliability for diverse communication services.
Innovation Solution
Implementing a common beam for multiple signals to a default beam used for transmitting and receiving a physical downlink shared channel (PDSCH), which reduces beam management latency and overhead by optimizing beam width based on mobility and mobility scenarios, and using a unified transmission configuration indicator framework for efficient data and control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate beams are used for different signals (PDCCH, PDSCH, CSI-RS), then signal-specific beam optimization is achieved, but beam management latency and overhead increase
Solution Approach 1:
The patent merges multiple signal-specific beam management procedures into a unified common beam framework. The network entity determines a common beam for the UE and applies it across multiple signals including PDCCH, PDSCH, and CSI-RS transmissions. This consolidation reduces the number of separate beam determination operations, thereby reducing beam management latency and overhead while maintaining adequate signal quality through the common beam.
2Measurement precision
If multiple beams are managed for different signals, then signal quality is optimized, but beam management overhead increases
Solution Approach 1:
The patent implements a universal common beam that serves multiple functions across different signal types. The same common beam determined for the UE is reused for PDCCH control channel transmissions, PDSCH data channel transmissions, and CSI-RS reference signal transmissions. This multi-functional approach reduces beam management overhead by eliminating the need for separate beam determination procedures for each signal type, while still maintaining optimized signal quality through the unified beam framework.
3Reliability
If beam width is optimized for stationary scenarios, then link budget is improved, but mobility support is reduced
Solution Approach 1:
The patent introduces dynamic beam width adjustment capabilities that adapt to mobility scenarios. The network entity can determine appropriate beam widths based on UE mobility status, transitioning from narrower beams optimized for stationary link budget to wider beams that provide better coverage for mobile UEs. This dynamic adaptation allows the system to maintain reliable connections across varying mobility conditions without being constrained to a fixed beam width optimization.
Data Source
AI summary
Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for applying a common beam for multiple signals to a default beam for a physical downlink shared channel (PDSCH). An example method generally includes receiving, from a network entity, configuration information, identifying a common beam for wireless communications between the UE and the network entity based on the received configuration information, identifying a default beam based, at least in part, on the common beam and one or more rules, and receiving a physical downlink shared channel (PDSCH) by using the identified default beam.