Dynamic QCL Indication for CoMP Downlink Control Information
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing downlink control information and resource allocation in multi-node coordinated communication systems, particularly in assuming quasi co-located antenna ports for resource mapping and demodulation reference signals.
Innovation Solution
A method for receiving and transmitting downlink control information in a wireless communication system that includes multiple resource allocation parts, where the quasi co-located (QCL) assumption between antenna ports is dynamically indicated, allowing for enhanced receiver processing performance by considering specific antenna ports for resource mapping and demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple resource allocation parts are used for downlink control information, then resource allocation flexibility and CoMP support are improved, but device complexity and processing overhead increase
Solution Approach 1:
The downlink control information is divided into multiple resource allocation parts, each independently indicating resource allocation for different antenna ports or transmission points. This segmentation allows flexible resource allocation for CoMP while enabling the receiver to process each part separately, managing complexity through modular handling of control information elements.
Solution Approach 2:
The patent enables dynamic indication of quasi co-located antenna port assumptions through the multiple resource allocation parts. The receiver can dynamically adapt its processing based on the QCL assumptions indicated in each resource allocation part, allowing flexible adjustment of processing complexity based on actual transmission conditions rather than using fixed complex processing for all cases.
2Reliability
If quasi co-located antenna port assumption is dynamically indicated, then receiver processing performance is improved, but downlink control information overhead increases
Solution Approach 1:
The QCL assumption indication is applied locally to each resource allocation part rather than globally to all resources. This allows the system to indicate QCL assumptions only where needed for specific antenna ports or transmission points, improving receiver processing performance for those specific resources while minimizing the overall overhead by avoiding redundant global indications.
3Reliability
If nodes are spaced apart in multi-node system, then signal to interference-plus-noise ratio is improved, but transmission area covered by each antenna is reduced
Solution Approach 1:
The patent combines resource allocation information for multiple antenna ports or transmission points into unified downlink control information. This merging allows the system to coordinate transmissions from spatially separated nodes, achieving high SINR through reduced interference while the coordinated resource allocation ensures comprehensive coverage by efficiently utilizing the combined transmission areas of all nodes.
Data Source
AI summary
One embodiment of the present invention discloses a method for receiving a downlink signal in a wireless communication system that supports coordinated multiple-point transmission and reception (CoMP), and the method comprises the steps of: receiving downlink control information that contains a plurality of resource allocation parts from a base station; and acquiring information on whether it can be assumed that an antenna port(s) of a particular reference signal and an antenna port (s) of a demodulation reference signal associated with each of the plurality of resource allocation parts are quasi co-located (QCL).