CU-DU System Information Broadcasting via Selective SIB Decoding
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Solution Overview
Problem
In distributed radio access networks, the current methods for broadcasting system information and interacting between the central unit (CU) and distributed unit (DU) are inefficient, leading to increased decoding failure rates and power consumption due to the need for terminals to decode all system information blocks, even if only a subset is required.
Innovation Solution
The proposed solution involves the CU and DU communicating through control information that indicates which system information blocks are to be sent in specific time intervals, allowing terminals to decode only the required blocks, and using separate or joint encoding of system information blocks based on shared or dedicated time-frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all system information blocks are broadcasted periodically, then system information completeness is improved, but terminal power consumption increases and decoding failure rate increases
Solution Approach 1:
The patent divides system information into multiple system information blocks (SIBs), where each SIB contains a subset of system information parameters. Terminals can selectively decode only the SIBs they need rather than decoding all system information blocks, thereby reducing power consumption while maintaining access to complete system information when required.
Solution Approach 2:
The patent enables terminals to perform partial decoding of system information by allowing selective reception of only necessary system information blocks. The network can configure different SIBs with different contents, and terminals decode only the subset required for their specific needs, avoiding the excessive action of decoding all SIBs.
2Loss of information
If all system information blocks are broadcasted periodically, then system information completeness is improved, but decoding failure rate increases
Solution Approach 1:
By segmenting system information into multiple SIBs, the patent reduces the complexity and size of each individual decoding task. Terminals face lower decoding failure rates when decoding smaller, selective SIBs compared to attempting to decode all system information blocks simultaneously, while still accessing complete system information through selective reception.
3Ease of manufacture
If system information is broadcasted using CU-DU architecture, then deployment cost is reduced, but interaction efficiency between CU and DU deteriorates
Solution Approach 1:
The patent applies segmentation to the CU-DU interaction by dividing system information management into separate functions: the CU is responsible for generating and managing system information content, while the DU handles the actual broadcasting and configuration of SIBs. This segmented approach improves interaction efficiency by allowing parallel processing and reducing coordination overhead compared to centralized management.
Data Source
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AI summary
This application provides a communication method and apparatus. The method includes: receiving, by a distributed unit DU, a first indicator from a central unit CU, where the first indicator is used to indicate that first system information is to be broadcast; and broadcasting, by the DU, a second indicator and the first system information, where the second indicator indicates that the first system information is being broadcast. Therefore, the DU can correctly broadcast the system information.