Beam-Formed Random Access Beam Selection for Lower Latency
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Solution Overview
Problem
The existing random access procedures in beamformed systems are time-consuming due to the need to send and receive information on multiple beams, which is inefficient for achieving ultra-low latency required in future communication systems.
Innovation Solution
A method for performing random access by identifying a first downlink reception beam and a corresponding uplink transmission beam, and transmitting a random access preamble using the identified beam, optimizing the process to reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random access procedures send and receive information on multiple beams, then reliability is improved, but time consumption increases
Solution Approach 1:
The patent applies preliminary action by performing beam measurement and identification before the random access procedure. The terminal device identifies the downlink reception beam and corresponding uplink transmission beam in advance by measuring beam measurement signals, so that when random access is needed, the device can immediately use the pre-identified beam without time-consuming beam sweeping, thus reducing random access time while maintaining reliability
Solution Approach 2:
The patent implements self-service by enabling the terminal device to autonomously perform beam measurement, identification, and selection without requiring network assistance for beam sweeping. The device uses its own measurement results to determine the best beam for random access, eliminating the need for time-consuming network-coordinated beam training procedures
2Loss of time
If beam measurement and identification is performed in advance, then random access latency is reduced, but measurement precision requirements increase
Solution Approach 1:
The patent performs beam measurement and identification in advance before random access is actually needed. By measuring beam measurement signals and identifying the best downlink reception beam and corresponding uplink transmission beam beforehand, the system reduces random access latency while the preliminary measurement can be performed with sufficient precision to ensure reliable beam selection
Solution Approach 2:
The patent uses feedback mechanisms where the terminal device measures beam measurement signals and provides feedback information about the identified beam to the network. This feedback loop allows the system to verify measurement precision and adjust if necessary, ensuring that the pre-identified beam is suitable for random access while maintaining measurement accuracy
Data Source
AI summary
A method for performing a random access is provided. The method includes identifying a first downlink (DL) reception (RX) beam based on a measurement on a beam measurement signal, identifying a first uplink (UL) transmission (TX) beam corresponding to the identified first DL RX beam and transmitting at least one random access preamble for an RX sweeping at a base station, using the identified first UL TX beam based on a first power.