RAR PDCCH Repetition Configuration for Beam Update Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communications networks, environmental changes can lead to performance degradation during initial access procedures due to beam failure and limited coverage of messages like Msg2 and Msg4, especially at high frequencies, as the beams used for initial access are low gain and dependent on synchronization signal blocks, which are prone to shadowing and blockage.
Innovation Solution
Implementing multiple repetitions of the random access response (RAR) physical downlink control channel (PDCCH) with different beam correspondence assumptions, enhanced reporting of beam measurements in message 3, and utilizing channel state information reference signals (CSI-RS) for early CSI reporting to improve beam management and coverage during initial access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple repetitions of RAR PDCCH with different beam correspondence assumptions are implemented, then the reliability of downlink message detection is improved, but the device complexity and signaling overhead increase
Solution Approach 1:
The patent segments the beam correspondence update process into multiple RAR PDCCH repetitions, where each repetition is associated with a different beam correspondence assumption. This allows the system to test multiple beam configurations in parallel during the random access response phase, improving detection reliability without requiring a complete beam sweep afterward.
Solution Approach 2:
The patent performs preliminary beam correspondence updates during the RAR PDCCH reception phase before proceeding to subsequent messaging. By updating beam correspondence assumptions early in the random access procedure, the system prepares optimal beam configurations in advance, preventing later communication failures due to environmental changes.
2Adaptability or versatility
If beam correspondence is updated rapidly using RAR PDCCH repetitions, then the adaptability to environmental changes is improved, but the processing time and complexity at the UE increase
Solution Approach 1:
The patent enables the UE to autonomously perform RSRP measurements on DMRS associated with each RAR PDCCH repetition and autonomously determine the best beam correspondence assumption without requiring extensive network coordination. This self-service approach reduces signaling overhead and allows rapid adaptation to environmental changes while minimizing additional processing time.
3Measurement precision
If RSRP measurements are performed on DMRS of each RAR PDCCH repetition, then the measurement precision for beam selection is improved, but the quantity of measurements and processing load increase
Solution Approach 1:
The patent performs RSRP measurements on all RAR PDCCH repetitions to ensure comprehensive beam evaluation, but then selects only the best beam correspondence assumption for subsequent messaging. This partial action approach maintains high measurement precision for decision-making while avoiding the need to process all measurement results equally, thereby reducing effective processing load.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for a configuration based on a reference signal received power measurement. One method includes receiving, a first configuration including a number of repetitions for a random access response (RAR) physical downlink control channel (PDCCH) and quasi-co-location (QCL) assumption associated with a demodulation reference signal (DMRS) of each repetition of the number of repetitions for the RAR PDCCH. The method includes performing reference signal received power (RSRP) measurements on the DMRS associated with each repetition of the number of repetitions for the RAR PDCCH. The method includes transmitting a message 3 to the network. The message 3 includes a RSRP measurement for at least one of the DMRS associated with each repetition of the number of repetitions for the RAR PDCCH and the corresponding QCL assumption.