Random Access Preamble Transmission for Cloud RAN Connectivity
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Solution Overview
Problem
In cloud RAN environments where RRU and BBU are separated, existing technologies face challenges in enabling efficient and stable random access for terminals, particularly in dynamically changing mapping relationships between RRUs and BBUs.
Innovation Solution
A method for a terminal to select RRUs with optimal connection states based on downlink signals, transmit an RRU list and random access preamble, and perform random access with a preferred RRU connected to a suitable BBU, considering resource availability and load status, to ensure stable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal performs random access in cloud RAN environment with separated RRU and BBU, then connectivity optimization is achieved, but complexity of determining optimal RRU-BBU pairs increases
Solution Approach 1:
The patent introduces an access information response message as an intermediary that carries BBU identification information and preferred RRU indication. This mediator enables the terminal to efficiently determine the optimal RRU-BBU pair without complex calculations, as the network side (BBU) provides the pairing information directly through the response message, thus resolving the contradiction between connectivity stability and access complexity
Solution Approach 2:
The patent implements a feedback mechanism where the BBU sends access information response messages containing preferred RRU indications and BBU identification information back to the terminal. This feedback loop allows the terminal to adapt to dynamic RRU-BBU mapping relationships and maintain reliable connectivity by following the network's recommendations, thereby reducing access complexity while ensuring connection stability
2Adaptability or versatility
If mapping relationship between RRU and BBU changes dynamically, then network flexibility is improved, but stability of random access deteriorates
Solution Approach 1:
The patent embraces dynamic RRU-BBU mapping relationships by designing a random access method that adapts to changing network conditions. The terminal receives access information response messages that reflect current network state and BBU preferences, allowing the system to dynamically adjust pairings while maintaining stable access through continuous feedback from the network side
Solution Approach 2:
The patent applies preliminary action by having the BBU pre-determine and indicate the preferred RRU for random access in the access information response message. This advance preparation and indication allow the terminal to perform stable random access without needing to complexly evaluate dynamic mapping relationships in real-time, thus maintaining reliability while supporting network flexibility
Data Source
AI summary
Disclosed are: a terminal for selecting RRUs of which a connection state with the terminal is a critical value or more from among a plurality of RRUs on the basis of down signals received from the RRUs, transmitting an RRU list including information on the selected RRUs and a random access preamble to an RRU having the best connection state with the terminal among the selected RRUs, receiving an access information response message indicating a preferred RRU with which a random access is to be performed by the terminal from any one RRU among the selected RRUs and performing a random access process with the preferred RRU; and a method for performing random access by the terminal.