Random Access Preamble Frequency Hopping Selection for Reliable Scheduling
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Solution Overview
Problem
Frequency hopping random access preamble sequences cause spectrum discontinuity and high complexity of radio resource scheduling in wireless communication systems, particularly in millimeter wave communication, leading to inefficiencies and increased signaling overheads.
Innovation Solution
A terminal device selectively chooses between frequency hopping and non-frequency hopping manners based on received frequency hopping information to transmit random access preamble sequences, allowing for diversity gain, reduced spectrum discontinuity, and simplified radio resource scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping manner is used to transmit random access preamble sequence, then reliability of receiving is improved through diversity gain, but spectrum discontinuity occurs and radio resource scheduling complexity increases
Solution Approach 1:
The patent applies dynamics by making the frequency hopping behavior adjustable rather than fixed. The network device can dynamically configure whether frequency hopping is applied through RRC signaling, allowing the system to adapt between frequency hopping mode (for high reliability) and non-frequency hopping mode (for low complexity) based on actual channel conditions and service requirements.
Solution Approach 2:
The patent changes the parameter of frequency hopping configuration from a fixed mandatory setting to a configurable parameter. By introducing RRC signaling to indicate whether frequency hopping is applied, the system can modify the frequency hopping parameter according to different scenarios, thereby balancing reliability and scheduling complexity.
2Reliability
If frequency hopping manner is used to transmit random access preamble sequence, then reliability of receiving is improved through diversity gain, but spectrum discontinuity occurs
Solution Approach 1:
The patent makes the spectrum usage pattern dynamic by allowing the network to configure frequency hopping on demand. When frequency hopping is configured, the terminal transmits preamble sequences across different frequencies to achieve diversity gain. When not configured, the terminal transmits on the same frequency resource, maintaining spectrum continuity. This dynamic configuration resolves the contradiction between reliability and spectrum stability.
Solution Approach 2:
The patent introduces a configurable parameter through RRC signaling that controls whether frequency hopping is applied. This parameter change allows the system to switch between frequency hopping (improving reliability through frequency diversity) and non-frequency hopping (maintaining spectrum continuity), thereby resolving the contradiction between these two opposing requirements.
3Device complexity
If non-frequency hopping manner is used to transmit random access preamble sequence, then spectrum discontinuity is avoided and radio resource scheduling complexity is reduced, but reliability of receiving may be compromised
Solution Approach 1:
The patent applies dynamics by allowing the system to switch between frequency hopping and non-frequency hopping modes based on actual needs. When service requirements demand high reliability, the network can configure frequency hopping to provide diversity gain. When simplicity and spectrum continuity are prioritized, the network can disable frequency hopping, thus dynamically balancing reliability and complexity.
Solution Approach 2:
The patent uses parameter configuration through RRC signaling to control the frequency hopping behavior. By changing this parameter, the system can adapt to different reliability requirements while maintaining low scheduling complexity when frequency hopping is not needed, thus resolving the contradiction between simplicity and reliability.
Data Source
AI summary
Embodiments of the present disclosure provide a communication method and apparatus. In the method, a terminal device receives, from a network device, frequency hopping information associated with a random access preamble sequence. Further, the terminal device selects a frequency hopping manner or a non-frequency hopping manner based on the frequency hopping information, to transmit the random access preamble sequence to the network device, where the random access preamble sequence is repeatedly transmitted.