Coordinated Multi-Point CSI Feedback Resource Allocation
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Solution Overview
Problem
Conventional cellular mobile communication systems face limitations in supporting high data rates for user equipment (UE) at cell edges due to severe interference from neighboring cells, leading to varying data rates based on UE location, and existing CSI feedback technologies do not effectively account for multi-CSI feedback in CoMP transmission scenarios.
Innovation Solution
A method and apparatus for efficiently transmitting and receiving feedback signals in a CoMP system, utilizing Dynamic cell Selection (DS), Dynamic cell Selection with Dynamic Blanking (DS/DB), and Joint Transmission (JT), where a central control device allocates resources for Channel State Information-Reference Signals (CSI-RS) and Interference Measurement Resources (IMR) to UEs, allowing them to estimate channels from multiple cells and measure interference, and the UE generates and transmits feedback signals based on indicated necessary feedback signals rather than all possible cases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional single-cell transmission is used, then system implementation is simple, but data rate for cell edge UEs is limited due to severe interference
Solution Approach 1:
The patent merges multiple cells into a coordinated multi-point transmission system where multiple base stations jointly serve a UE. This combining of transmission points provides signal diversity and interference coordination, enabling cell edge UEs to achieve high data rates by receiving coordinated signals from multiple cells rather than being limited by single-cell interference.
Solution Approach 2:
The patent segments the interference management into distinct measurement resources (CSI-RS for channel measurement, IMR for interference measurement) and feedback mechanisms. By dividing the complex CoMP transmission into manageable components including channel estimation, interference measurement, and coordinated feedback, the system can effectively manage multiple cells while maintaining controllable complexity.
2Measurement precision
If all possible feedback signals are transmitted for every signal and interference case, then measurement precision is improved, but feedback overhead increases significantly
Solution Approach 1:
The patent extracts only the necessary feedback information by introducing a feedback signal indication mechanism. Instead of transmitting all possible feedback signals for every case, the system identifies and extracts only the relevant feedback signals based on current transmission conditions, significantly reducing feedback overhead while maintaining measurement precision for coordinated multi-point transmission.
Solution Approach 2:
The patent applies partial action by transmitting a subset of feedback signals rather than all possible feedback signals. The feedback signal indication mechanism selectively activates only the necessary feedback transmissions based on current channel and interference conditions, achieving sufficient measurement precision without the excessive overhead of complete feedback for all cases.
3Productivity
If CoMP transmission with multiple cells is implemented, then data rate for cell edge UEs is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring measurement resources (CSI-RS and IMR) and establishing feedback indication mechanisms before CoMP transmission begins. This advance preparation of measurement configurations and feedback rules simplifies the real-time operation by having predetermined procedures in place, reducing the complexity of dynamic decision-making during transmission.
Solution Approach 2:
The patent introduces an intermediary feedback signal indication mechanism that mediates between the complex multi-cell transmission environment and the UE feedback. This intermediary layer translates complex channel and interference measurements into selective feedback signal transmissions, managing system complexity by providing a structured interface between multiple cells and the feedback mechanism.
4Object-affected harmful factors
If dynamic cell selection and blanking are used, then interference mitigation is improved, but resource allocation complexity increases
Solution Approach 1:
The patent implements dynamic cell selection and dynamic blanking where the serving cells and blanking patterns are dynamically adjusted based on channel conditions and interference measurements. This dynamic adaptation allows the system to optimize interference mitigation in real-time by selectively activating or blanking specific cells, improving interference management while maintaining flexible resource allocation through predefined dynamic rules.
Data Source
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AI summary
A method and apparatus for transmitting and receiving transmitting channel state information, CSI, in a mobile communication system, the method for transmitting comprising steps of: identifying at least one CSI feedback information, where each feedback information comprises CSI-reference signal, RS, information, interference measurement resources, IMR, information and a feedback indication; determining a set of CSI feedback information to be transmitted based on the feedback indication; generating a set of CSI corresponding to the set of CSI feedback information, based on the CSI-RS information and the IMR information associated with each of the set of CSI feedback information, where the CSI-RS information is for signal measurement and the IMR information is for interference measurement; and transmitting the set of CSI..