QCL Information Sets for Data Transmission Reliability
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Solution Overview
Problem
Current data transmission methods in advanced communication technologies, such as NR, face challenges in improving communication reliability, especially in ultra-reliable low-latency communication scenarios, due to dependence on time-domain channel correlation, which limits diversity gain and increases the likelihood of data transmission failure.
Innovation Solution
The method involves determining and using multiple quasi-co-location (QCL) information sets for re-transmissions across different time domain units, allowing data to be transmitted using different space domain resources, thereby enhancing the success probability of data transmission by leveraging both time and space domain diversities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is repeatedly transmitted in consecutive slots using the same time-domain resources, then transmission reliability can be improved through time diversity, but the effectiveness is limited when channel correlation is high
Solution Approach 1:
The patent introduces spatial domain resources (different QCL information sets corresponding to different spatial directions or beams) to complement the existing time-domain repetition approach. By transmitting data through multiple spatial dimensions with different QCL parameters, the system achieves spatial diversity gain independent of time-domain channel variations, resolving the limitation of time-only diversity when channel correlation is high.
Solution Approach 2:
The patent changes the transmission parameters by associating different QCL information sets (with different spatial parameters) with different time-domain units. This parameter variation across time and space allows the system to adapt to different channel conditions, improving reliability without being constrained by time-domain channel correlation.
2Reliability
If multiple QCL information sets are used for re-transmissions across different time domain units, then spatial and temporal diversity can be achieved, but system complexity increases
Solution Approach 1:
The patent designs the QCL information structure to serve multiple functions: it identifies spatial resources, indicates transmission beams, and provides channel estimation references. This multi-functionality reduces the need for separate signaling mechanisms, thereby managing complexity while achieving spatial and temporal diversity for improved reliability.
Solution Approach 2:
The patent segments the QCL information into multiple sets, each associated with specific time-domain units and spatial resources. This segmentation allows the system to manage complexity by organizing QCL information in a structured manner, where each set handles specific spatial-temporal relationships, making the overall system more manageable despite the increased diversity dimensions.
3Ease of manufacture
If data transmission depends on time-domain channel correlation, then implementation is simple, but diversity gain is limited and transmission failure probability increases
Solution Approach 1:
The patent adds spatial dimension to the transmission system by introducing multiple QCL information sets that correspond to different spatial resources. This dimensional expansion provides diversity gain through spatial separation, reducing transmission failure probability without significantly complicating the implementation, as the spatial resources are naturally available in multi-antenna systems.
Data Source
AI summary
This application provides a data transmission method and a communication apparatus, to improve data transmission reliability. The method includes: receiving downlink control information (DCI); determining a plurality of pieces of quasi-co-location (QCL) information based on the DCI; and receiving downlink data based on the plurality of pieces of QCL information. The plurality of pieces of QCL information correspond to a plurality of time domain units, each time domain unit corresponds to at least one piece of QCL information, and at least two of the plurality of pieces of QCL information are different, that is, the downlink data is from at least two network devices.