Random Access Preamble Configuration for Beam Mismatch Reduction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in random access processes due to the lack of a suitable method for determining random access resources, leading to beam mismatch issues and low random access efficiency in new radio (NR) technology.
Innovation Solution
A method is introduced where configuration information is used to indicate the quantity of random access preambles and downlink signals, allowing terminals to determine the appropriate random access resource, thereby improving synchronization and efficiency by associating random access preambles with specific downlink signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beam scanning technology is used to perform downlink synchronization with multiple beams, then full-range coverage is achieved, but the base station capability requirements increase and time division multiplexing reduces random access efficiency
Solution Approach 1:
The patent segments the random access resources by associating different random access preambles with different downlink signals (beams). This allows terminals to select appropriate preambles based on detected downlink signals, enabling parallel processing of multiple beams without requiring sequential time division multiplexing, thus improving random access efficiency while maintaining full-range coverage
Solution Approach 2:
The patent performs preliminary association between random access preambles and downlink signals before the random access process. The network device configures and indicates this correspondence relationship to terminals in advance, allowing terminals to proactively select suitable preambles based on detected downlink signals, eliminating the need for blind attempts and beam mismatch issues
2Device complexity
If terminals blindly attempt random access resources without proper determination method, then random access process is simple, but beam mismatch occurs and random access efficiency decreases
Solution Approach 1:
The patent introduces feedback mechanism where the network device indicates the correspondence relationship between random access preambles and downlink signals to terminals. Terminals use this feedback information to intelligently select preambles based on detected downlink signals, avoiding blind attempts and beam mismatch while maintaining manageable system complexity through standardized indication methods
3Reliability
If multiple beams are used for full-range coverage, then signal reception efficiency improves, but the quantity of beams and resources increases requiring more complex matching
Solution Approach 1:
The patent applies local quality principle by associating specific random access preambles with specific downlink signals (beams). Each preamble is locally optimized for a particular beam, allowing terminals to match their uplink transmission characteristics with the corresponding downlink beam characteristics. This reduces overall matching complexity while maintaining high signal reception quality through localized optimization
Data Source
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AI summary
This application provides a random access method, a network device, and a terminal. The method includes: determining, by a network device, configuration information, where the configuration information is used to indicate at least one of the following: a quantity of random access preambles transmitted on one random access resource, a quantity of contention-based random access preambles transmitted on one random access resource, a quantity of contention-free random access preambles transmitted on one random access resource, a quantity of random access preambles associated with one downlink signal, a quantity of contention-free random access preambles associated with one downlink signal, a quantity of contention-based random access preambles associated with one downlink signal, and a quantity of actually transmitted downlink signals associated with one random access resource; and sending the configuration information to a terminal. In this way, the terminal sends a random access preamble based on the configuration information. The network device indicates related information about random access to the terminal, to complete a random access process.