Random Access Preamble Transmission with Adaptive Characteristics
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Solution Overview
Problem
In future wireless communications networks, random access failures occur due to the random access preamble not arriving at the network device, and existing solutions for LTE systems are not applicable, leading to inefficiencies in access success rates.
Innovation Solution
User equipment sends a first random access preamble and, upon failure, sends additional preambles with different access characteristic information such as time length, transmit beam, and random access resource, prioritized by time length, transmit power, and resource, to increase the chances of successful access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment sends a single random access preamble, then the transmission process is simple, but the random access success rate is low due to potential failure in preamble arrival
Solution Approach 1:
The patent segments the random access preamble transmission into multiple independent transmission attempts, each with different access characteristic information. Instead of sending one preamble, the UE transmits multiple preambles with varying parameters (time length, transmit beam, random access resource) to increase the probability that at least one will be successfully received by the network device.
Solution Approach 2:
The patent changes the parameters of the random access preamble across multiple transmissions. Each subsequent preamble transmission uses different access characteristic information (time length, transmit beam, random access resource) compared to previous transmissions. This parameter variation ensures that if one transmission fails due to specific conditions, other transmissions with different parameters may succeed.
2Reliability
If multiple random access preambles are sent with different characteristics, then the random access success rate increases, but the transmission complexity and resource consumption increase
Solution Approach 1:
The patent implements a dynamic preamble transmission strategy where the UE adapts the access characteristic information based on transmission outcomes and priority-based sorting. The system dynamically adjusts which parameters to vary in subsequent transmissions, rather than using a fixed pattern, allowing optimal resource usage while maintaining high success probability.
Solution Approach 2:
The patent enables the UE to autonomously manage its own preamble transmissions by performing priority-based sorting of access characteristic information and selecting appropriate parameters for each transmission attempt without requiring external control. The UE self-regulates the transmission process based on its own state and the outcomes of previous attempts.
3Reliability
If multiple random access preambles are transmitted with different characteristics, then the chances of successful access increase, but the time consumption and access delay increase
Solution Approach 1:
The patent applies preliminary action by pre-sorting the access characteristic information in priority order before transmission begins. The UE prepares multiple preambles with different characteristics and establishes their transmission priority in advance, allowing the system to quickly attempt transmissions in the optimal sequence without requiring complex real-time decision-making during the access process.
Data Source
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AI summary
Embodiments of the present invention disclose a random access preamble sending method and an apparatus. The method includes: sending, by user equipment, a first random access preamble to a network device, where the first random access preamble is used by the user equipment to access the network device; and when the user equipment fails in accessing the network device by using the first random access preamble, sending at least one second random access preamble to the network device, where access characteristic information of each second random access preamble is different from that of the first random access preamble, the access characteristic information includes at least one of a time length, a transmit beam, and a random access resource, and the at least one second random access preamble is used by the user equipment to access the network device. In the embodiments of the present invention, a problem of a random access failure in a future wireless communications network caused by the fact that a random access preamble does not arrive at the network device is resolved, thereby increasing a probability that the random access preamble arrives at the network device and increasing a random access success rate.