Multi-Beam Random Access Preamble Transmission for Delay Reduction
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Solution Overview
Problem
Current random access methods in communication systems, particularly in LTE, are inadequate for multi-beam systems, leading to increased delays and blind transmissions due to the lack of a suitable method for determining the correct beam for information transmission and reception.
Innovation Solution
A method and device for random access in multi-beam communication systems, where a terminal device receives and sends random access preambles using different beams based on network-deployed and optimized random access-related information, allowing it to determine the correct beam for communication and reduce delays by detecting valid responses within a preset time window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device uses a single beam for random access in multi-beam systems, then the device complexity is reduced, but the random access delay increases and blind transmissions occur
Solution Approach 1:
The patent segments the random access procedure into multiple attempts, each using a different beam. The terminal device divides the beam search space into discrete beam candidates and systematically tests each one, transforming the continuous beam selection problem into discrete segmented steps that can be managed efficiently
Solution Approach 2:
The patent applies preliminary action by having the terminal device send random access preambles on multiple beams in advance before establishing communication. This allows the network to identify a suitable beam beforehand, avoiding the need for subsequent beam switching and reducing overall access delay
2Loss of time
If the terminal device transmits random access preambles on multiple beams, then the random access delay is reduced, but the use of energy increases
Solution Approach 1:
The patent implements partial action by limiting the number of beams on which preambles are transmitted. Instead of exhaustively testing all possible beams, the terminal device transmits on a selective subset of beams based on available beam information, achieving acceptable access delay while constraining energy consumption to reasonable levels
Solution Approach 2:
The patent uses feedback mechanisms where the network responds to received preambles with beam indication information. This feedback allows the terminal device to adapt its beam selection strategy, concentrating energy on promising beams identified through network feedback rather than uniformly transmitting on all beams
3Adaptability or versatility
If the network device provides multiple groups of random access-related information, then the adaptability to multi-beam systems is improved, but the device complexity increases
Solution Approach 1:
The patent achieves universality by designing a random access framework that can operate with N groups of configuration information, where N is flexible. The same basic random access procedure handles both single-beam and multi-beam scenarios, allowing the system to adapt to different deployment configurations without requiring separate specialized procedures for each case
Solution Approach 2:
The patent uses parameter changes by allowing the network to configure different parameters (such as preamble sets, time-frequency resources, and beam associations) across N groups of random access-related information. This enables the system to adapt to multi-beam configurations by adjusting these parameters rather than changing the fundamental access procedure structure
Data Source
AI summary
The present application provides a method and device for random access. The method includes: receiving, via a terminal device, N groups of random access-related information sent by a network device, wherein the N groups of random access-related information are determined by the network device according to a network deployment and optimization policy, and the ith group of random access-related information is used by the terminal device for determining a random access preamble set i and a time-frequency resource corresponding to the random access preamble set i, N being a positive integer greater than or equal to 1, i=1, . . . N; and sending, via the terminal device, a random access preamble to the network device according to the N groups of random access-related information.