CSI Feedback Resource Allocation in Multi-Cell Systems
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Solution Overview
Problem
Existing communication technologies face challenges in providing effective downlink Channel State Information (CSI) feedback in multi-antenna multi-carrier multi-cell environments, leading to insufficient and inoperable CSI feedback.
Innovation Solution
A method of resource allocation for CSI feedback is introduced, where CSI feedback modes are configured for each coordinated cell, and feedback resources are allocated to prevent collisions within a sub-frame, with options including increasing feedback periods, setting different sub-frame offsets, and multiplexing resources, along with collision solution rules to prioritize feedback types based on period, overhead, or pre-configured priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If feedback resources are allocated for multiple coordinated cells and carriers, then CSI feedback coverage is improved, but resource collisions increase
Solution Approach 1:
The patent segments feedback resources by configuring different feedback modes (e.g., periodic, aperiodic, semi-persistent) for different coordinated cells and carriers. Each cell carrier combination is assigned specific feedback resources with unique time-frequency positions, preventing collisions while maintaining comprehensive CSI feedback coverage across the multi-cell multi-carrier system
Solution Approach 2:
The patent implements dynamic feedback resource allocation where the base station can flexibly configure feedback modes, periods, and offsets for different cells and carriers based on channel conditions and traffic requirements. This dynamic adjustment allows the system to adapt resource allocation to changing conditions, ensuring reliable feedback transmission while maintaining broad coverage
2Reliability
If feedback periods are increased to reduce collisions, then resource conflict is reduced, but feedback timeliness deteriorates
Solution Approach 1:
The patent employs periodic feedback mechanisms with configurable periods for different cells and carriers. By setting appropriate feedback periods and offsets, the system achieves periodic resource allocation that prevents collisions while maintaining timely feedback. The periodic structure ensures regular CSI updates without excessive resource consumption
Solution Approach 2:
The patent changes feedback parameters (period, offset, mode) dynamically based on channel conditions and system state. When channel conditions are stable, longer periods reduce collisions; when conditions change rapidly, shorter periods maintain timeliness. This parameter adaptation resolves the contradiction between collision avoidance and feedback timeliness
3Loss of information
If multiple feedback types are transmitted simultaneously, then information completeness is improved, but resource collision increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring feedback modes and resources for different feedback types (CQI, PMI, RI) before transmission. The base station assigns specific time-frequency resources to each feedback type in advance, ensuring complete information transmission without collisions. This preliminary resource allocation simplifies the transmission process while maintaining information completeness
Data Source
AI summary
A method of resource allocation for Channel State Information (CSI) feedback is provided, which comprises the following steps of: configuring, for a User Equipment (UE), a CSI feedback mode for each of a plurality of coordinated cells; allocating feedback resources required for CSI feedback by the UE for each of the plurality of coordinated cells based on the configured feedback modes, such that the CSI feedbacks for different coordinated cells will not collide with each other within one sub-frame; and notifying the configured feedback modes and the allocated feedback resources to the UE. In addition, a method of Channel State Information (CSI) feedback is provided, which comprises the following steps of: receiving, at a User Equipment (UE), from a Base Station (BS) information on configured feedback modes and allocated feedback resources for CSI feedback for a plurality of coordinated cells; feeding, by the UE, the CSI of the plurality of coordinated cells back to the BS over the allocated feedback resources based on the configured feedback modes; and solving, when feedback types underlying different feedback modes collide with each other within one sub-frame, the collision based on a collision solution rule.