Radio Base Station Pre-coding Repeater Selection
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Solution Overview
Problem
The integration of on/off repeaters in radio access networks is complicated by the need for extra uplink reports and interaction between repeaters and user equipment, leading to increased signaling overhead and interference.
Innovation Solution
Radio base stations operate in pre-coding mode, where repeaters measure downlink reference signals, select pre-coding matrices, and transmit their indices to the RBS, allowing the RBS to determine UE repeater selection without additional uplink reports or UE-repeater interaction, by comparing these indices with those received from the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional UE-based repeater selection is used, then repeater selection can be achieved, but extra uplink reports and interaction signaling are needed, increasing signaling overhead and device complexity
Solution Approach 1:
Instead of having the UE select and report the preferred repeater directly (traditional approach), the invention inverts the process: the RBS determines repeater selection by comparing PMI indices received from the UE and repeaters. This inversion eliminates the need for extra uplink reports from UEs about repeater preferences, reducing signaling overhead while maintaining repeater selection capability
Solution Approach 2:
The invention introduces PMI (Precoding Matrix Index) comparison as an intermediary mechanism. The RBS uses the PMI indices received from both the UE and repeaters as intermediate data to indirectly determine repeater selection, avoiding direct UE-repeater interaction signaling and reducing overall system complexity
2Area of stationary object
If repeaters are used to extend coverage, then coverage area is improved, but inter-cell interference increases due to signal amplification
Solution Approach 1:
The invention applies local quality by controlling repeater operation on a per-UE basis. The RBS determines which repeaters should be active for each specific UE based on PMI comparison, allowing selective activation of repeaters only where needed for specific users, thereby extending coverage locally while minimizing interference in other areas
Solution Approach 2:
The invention introduces dynamic control of repeater on/off states based on scheduling decisions. The RBS can adaptively turn repeaters on or off depending on which UEs are scheduled for transmission, optimizing coverage extension while reducing interference dynamically according to network conditions
3Productivity
If multiple repeaters are deployed to increase network capacity, then data rate is improved, but coverage decreases due to the trade-off between transmission range and end-to-end data rate
Solution Approach 1:
The invention segments the network into multiple repeater-served zones, each handled independently through PMI-based selection. By dividing the coverage area into distinct repeater regions and selectively activating them based on UE location and scheduling, the system can support multiple high-rate connections simultaneously while maintaining extended coverage through coordinated repeater usage
Data Source
AI summary
The present invention relates to methods and arrangements that enable easy integration of on/off repeaters in a radio access network and a minimized signaling for the UE repeater selection. This is achieved by a solution where the RBSs are working in a pre-coding mode and where the repeaters are measuring the downlink reference signals, selecting pre-coding matrices and feeding the index of selection back (i.e. the PMI) to the RBS, in analogy with what a UE does. This allows the RBS to distinguish the UE repeater selection, without introducing any extra uplink report or interaction between UEs and repeaters, by comparing the index from the UE with the indices from different repeaters.