CSI-RS Repeater Configuration for Low-Overhead Beam Forwarding
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Solution Overview
Problem
The burden of control signaling overhead in wireless networks due to the need to signal control information for each time slot in smart repeaters, and the inefficiency of channel state information reference signal (CSI-RS) resource mapping in frequency and time with code division multiplexing, particularly for repeaters without baseband capability, which cannot interpret frequency allocation or FD-CDM configuration.
Innovation Solution
Configuring repeaters with CSI-RS resource sets that include time information, forwarding each CSI-RS beam to a specific direction, combining multiple CSI-RS ports in a symbol, measuring CSI-RS beams, and reporting cri-rsrp/cri-snr if equipped with baseband processing, and enabling simultaneous DL data transmission based on reported CSI measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control information is signaled for each time slot in smart repeaters, then efficient amplify and forward mechanism can be achieved, but control signaling overhead burden increases
Solution Approach 1:
The patent segments the control information signaling into two parts: semi-static TCI state configurations signaled via RRC signaling (less frequent updates) and dynamic activation via MAC-CE or DCI (more frequent but compact). This segmentation reduces the overhead burden compared to signaling complete control information for every time slot while maintaining efficient amplify-and-forward operation.
Solution Approach 2:
The patent employs preliminary action by pre-configuring TCI state information through RRC signaling before actual data transmission. This preliminary configuration establishes the spatial parameters in advance, allowing subsequent transmissions to use pre-established beam configurations rather than signaling all parameters repeatedly, thus reducing overhead while maintaining efficiency.
2Adaptability or versatility
If CSI-RS resources are mapped with code division multiplexing in frequency-division and time-division, then multiple antenna ports can transmit CSI-RS, but repeaters without baseband capability cannot interpret frequency allocation or FD-CDM configuration
Solution Approach 1:
The patent introduces an intermediary approach where the base station acts as the intelligent entity that performs the complex FD-CDM mapping and frequency allocation calculations. The repeater, even without baseband capability, simply receives the configured TCI states and applies them as instructed. This intermediary role of the base station enables sophisticated multi-antenna port CSI-RS transmission while keeping the repeater operation simple and interpretation-free.
Solution Approach 2:
The patent changes the operational parameters from requiring the repeater to interpret complex frequency allocation and FD-CDM configurations to simply applying pre-configured TCI state parameters. By transforming the problem from interpretation-based operation to parameter-application operation, repeaters without baseband capability can effectively support multi-antenna port CSI-RS transmission through simplified mechanisms.
3Reliability
If smart repeaters use more control information from the network, then efficient amplify and forward mechanism is achieved, but signaling burden on control signaling overhead increases
Solution Approach 1:
The patent implements periodic action by updating TCI state configurations at appropriate intervals rather than continuously for every time slot. RRC signaling provides semi-static configurations that remain valid for multiple transmission occasions, while MAC-CE or DCI provides periodic updates only when beam changes are needed. This periodic update mechanism maintains reliability by ensuring current beam information is available while significantly reducing the continuous signaling overhead burden.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for repeater configuration for channel state information reference signal. An apparatus includes a transceiver that receives a first configuration from a base station of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node. The transceiver receives a second configuration from the base station, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams. The transceiver receives repeater-specific CSI-RS to be forwarded to the UE device and transmits the repeater-specific CSI-RS to the UE device according to the first configuration.