PUCCH Resource Allocation for Multi-Node CSI Feedback
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Solution Overview
Problem
In multi-node wireless communication systems, efficiently allocating resources for the transmission of channel state information (CSI) from user equipment (UE) to multiple nodes is challenging, particularly when each node transmits a different reference signal, leading to potential collisions and inefficiencies in CSI feedback.
Innovation Solution
The method involves reserving and configuring multiple Physical Uplink Control Channel (PUCCH) resources through which UE can transmit CSI, with each resource allocated based on specific configuration information received from higher layers, ensuring non-overlapping transmission in the same uplink subframe and using orthogonal sequence indices, Cycle Shift indices, and physical resource indices to determine the transmission parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PUCCH resources are allocated for CSI feedback in multi-node systems, then CSI feedback reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The patent segments the CSI feedback resources by allocating separate PUCCH resources for different nodes. Each node receives CSI feedback through dedicated PUCCH resources, preventing collisions and ensuring reliable feedback transmission to multiple nodes simultaneously.
Solution Approach 2:
The patent introduces orthogonal sequence indices as an additional dimension for resource differentiation. By using orthogonal sequences with different indices, the system can distinguish between CSI feedback for different nodes even when using the same physical resources, thereby increasing resource utilization while maintaining reliability.
2Productivity
If orthogonal sequence indices are used to differentiate CSI transmission, then resource utilization is improved, but measurement precision requirements increase
Solution Approach 1:
The patent uses orthogonal sequences as mathematical copies that maintain the same physical resource allocation but differ in their sequence properties. This allows multiple nodes to share the same time-frequency resources while being distinguishable through their unique orthogonal sequence indices, thereby improving resource utilization without requiring additional physical resources.
Data Source
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AI summary
There are provided a method and apparatus in which user equipment transmits channel state information. The method includes reserving a plurality of configured Physical Uplink Control Channel (PUCCH) resources through which channel state information can be transmitted, receiving a plurality of reference signals, generating channel state information by measuring each of the plurality of reference signals, and transmitting the channel state information about each of the plurality of reference signals through the plurality of PUCCH resources.