Default Beam Selection for PDSCH Communications
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently identifying and utilizing a default beam for transmitting and receiving communications on a physical downlink shared channel (PDSCH), particularly across multiple time periods, which affects latency, reliability, and overall performance.
Innovation Solution
The method involves a user equipment (UE) and a network entity exchanging configuration information to select a default beam for use across multiple time periods. This default beam is chosen based on specific criteria, such as UE capabilities and channel conditions, to ensure optimal communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a default beam is selected for use across multiple time periods, then spatial diversity is improved and intersymbol interference is reduced, but the system requires additional configuration information exchange and beam selection complexity
Solution Approach 1:
The patent applies preliminary action by selecting and configuring a default beam in advance before actual data transmission occurs. The network entity determines the default beam based on configuration information and indicates it to the UE through DCI or RRC signaling, so that the beam is ready for use across multiple time periods without requiring complex real-time beam selection during transmission.
Solution Approach 2:
The patent implements universality by making a single default beam serve multiple functions across different time periods and for different PDSCH transmissions. Instead of selecting different beams for each transmission, the same default beam is reused across multiple slots and time periods, simplifying the beam management while maintaining reliable communication.
2Measurement precision
If configuration information is exchanged to identify a default beam, then beam selection accuracy is improved, but signaling overhead and latency increase
Solution Approach 1:
The patent uses preliminary action by performing beam configuration in advance through RRC signaling or pre-configured parameters, so that when data transmission needs to occur, the default beam is already identified and ready for use, minimizing the time loss during actual transmission.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network entity determines and indicates the default beam through DCI signaling or pre-configured TCI states, acting as a mediator between the complex beam measurement process and the actual transmission, thereby reducing the time burden on the UE while maintaining accuracy.
3Productivity
If a default beam is used across multiple time periods, then resource utilization is improved, but adaptability to changing channel conditions may be reduced
Solution Approach 1:
The patent applies dynamics by allowing the default beam configuration to be updated and reconfigured based on changing channel conditions. While the same beam is used across multiple time periods for efficiency, the network entity can determine new default beams when conditions change, and the UE can be reconfigured through subsequent signaling, thus maintaining both resource efficiency and adaptability.
Solution Approach 2:
The patent uses parameter changes by allowing the TCI state parameters and beam configuration parameters to be modified based on channel conditions. The network entity can change the default beam parameters when needed, balancing the need for consistent resource utilization with the need to adapt to varying wireless conditions.
Data Source
AI summary
Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for selecting a default beam for communications between a user equipment (UE) and network entity on a physical downlink shared channel (PDSCH). An example method generally includes receiving, from a network entity, configuration information, selecting a default beam based on the configuration information, wherein the default beam is selected for use across a plurality of time periods, and receiving a physical downlink shared channel (PDSCH) using the default beam across the plurality of time periods.