Random Access Configuration for Millimeter-Wave Beam Pairing
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Solution Overview
Problem
Millimeter-wave communication in 5G systems faces challenges with high fading and loss in radio channels, leading to prolonged transmission and detection times, which result in increased communication resource consumption and unsatisfactory access delay and experience, particularly in contention-free random access scenarios.
Innovation Solution
A method for random access configuration that involves determining and transmitting random access configuration information, including repetition times of subsequences in a preamble sequence and the number of random access transmission occasions, to optimize beam pairing between base stations and user equipment, reducing signaling interaction overhead and service delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming and beam sweeping are used to overcome high fading and loss in millimeter-wave communication, then transmission distance and signal quality are improved, but transmission and detection times are prolonged
Solution Approach 1:
The base station performs downlink beam sweeping first to determine the optimal downlink beam before the UE performs uplink beam sweeping. This preliminary action provides the UE with beam direction information in advance, reducing the time needed for uplink beam detection and alignment.
Solution Approach 2:
The base station feeds back the optimal downlink beam index to the UE based on downlink beam sweeping results. The UE uses this feedback information to guide its uplink beam sweeping process, enabling faster and more accurate beam pairing while reducing unnecessary detection attempts.
2Reliability
If conventional contention-free random access is used in millimeter-wave communication, then uplink synchronization is established, but access delay and resource consumption are increased due to prolonged beam pairing time
Solution Approach 1:
Downlink beam sweeping and optimal beam determination are performed before the uplink random access procedure. The base station prepares beam pairing information in advance and provides it to the UE, so that the UE can directly use the pre-determined beam for uplink transmission without extensive trial-and-error detection.
Solution Approach 2:
The base station provides feedback information including the optimal downlink beam index to the UE before the random access procedure. This feedback enables the UE to perform targeted uplink beam sweeping with fewer attempts, significantly reducing access delay and communication resource consumption.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Compared to the prior art, the present invention transmits a multiple of subsequences in a preamble sequence at a multiple of random access transmission occasions by using design of random access channel structure so as to increase the success rate of the detection and access efficiency.