Multi-point PUCCH Attachment for Wireless CSI Reporting
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE, face challenges in efficiently managing channel state information (CSI) reporting across multiple cells, leading to latency and interference issues due to reliance on backhaul exchanges and limited reporting capabilities.
Innovation Solution
Implementing periodic over-the-air CSI reporting via a control channel multi-point attachment, allowing user equipment (UE) to directly transmit CSI to both serving and non-serving cells, with parameters including periodicity, timing advance commands, and power control, to mitigate interference and improve reporting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backhaul exchanges are used for CSI reporting between serving and non-serving cells, then interference management can be coordinated, but latency increases and reporting efficiency decreases
Solution Approach 1:
The patent extracts the CSI reporting function from the backhaul exchange path and establishes a direct over-the-air transmission path from UE to non-serving cells. This eliminates the intermediate backhaul processing step, thereby reducing latency while maintaining the coordination capability through direct wireless communication.
Solution Approach 2:
The serving cell acts as an intermediary that receives CSI reports from UEs and forwards necessary information to non-serving cells via backhaul, while simultaneously enabling direct UE-to-non-serving-cell transmission. This dual-path approach maintains coordination reliability while reducing latency for time-critical reporting.
2Device complexity
If traditional single-point PUCCH attachment is used, then system complexity is low, but CSI reporting capability to multiple cells is limited
Solution Approach 1:
The patent implements multi-point PUCCH attachment that enables a single UE to transmit CSI reports to multiple serving and non-serving cells simultaneously. This multi-functional capability allows the same PUCCH structure to serve both traditional single-cell and advanced multi-cell coordination scenarios, enhancing versatility without proportionally increasing complexity.
Solution Approach 2:
The patent segments the CSI reporting function into separate configurable components for different cells, allowing independent control of reporting parameters (periodicity, offsets, resource allocation) for each serving and non-serving cell. This segmentation enables flexible adaptation to multiple cell scenarios while maintaining manageable system complexity through modular configuration.
3Productivity
If periodic over-the-air CSI reporting to multiple cells is implemented, then reporting efficiency improves and latency reduces, but resource allocation complexity and interference management difficulty increase
Solution Approach 1:
The patent implements dynamic resource allocation for multi-point PUCCH attachment, where reporting parameters (periodicity, time offsets, frequency resources) can be independently configured and adjusted for each cell based on channel conditions, traffic patterns, and interference levels. This dynamic adaptability enables efficient resource utilization across multiple cells while managing complexity through flexible, condition-based configuration.
Solution Approach 2:
The patent employs periodic CSI reporting mechanisms with configurable periods and time offsets for different cells, allowing systematic resource allocation that simplifies scheduling and interference management. The periodic structure provides predictable resource usage patterns that ease coordination while maintaining high reporting efficiency through regular, timed transmissions.
Data Source
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AI summary
Various aspects of the present disclosure are directed to periodic over-the-air channel state information (CSI) reporting to base stations. Thereby, a method of wireless communication is described, the method comprising identifying, by a user equipment, UE, a first base station that is interfering with a downlink signal from a second base station, receiving, by the UE from the second base station, a signal indicating first parameters of the first base station for transmitting a first channel state information, CSI, report to the first base station and second parameters of the second base station for transmitting a second CSI report to the second base station, wherein the first parameters of the first base station is different from the second parameters of the second base station, transmitting, by the UE, the first CSI report to the first base station based at least in part on the first parameters of the first base station and transmitting, by the UE, the second CSI report to the second base station based at least in part on the second parameters of the second base station.