UE RS-Based PDSCH Transmission Scheme for Non-Backward Compatible Carriers
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Solution Overview
Problem
In LTE-A systems, non-backward compatible component carriers have limited application scenarios and reduced spectrum utilization due to the lack of support for downlink transmission mode 9 in small-sized traffic and high-speed movement scenarios, leading to decreased system capacity.
Innovation Solution
Implementing a UE RS-based Non-PMI feedback transmission scheme or a UE RS-based up to 8 layer transmission scheme for non-backward compatible component carriers, allowing the eNB to determine and notify the UE of the PDSCH transmission scheme, thereby expanding application scenarios and enhancing spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If non-backward compatible component carriers are configured without CRS, then device complexity is reduced and backward compatibility requirements are simplified, but application scenarios are limited and spectrum utilization is reduced
Solution Approach 1:
The patent changes the transmission scheme parameter from CRS-based to UE RS-based, enabling non-backward compatible component carriers to support multiple downlink transmission modes including mode 9, thereby expanding application scenarios without requiring CRS configuration
Solution Approach 2:
The patent makes the non-backward compatible component carrier universal by enabling it to support both transmission mode 9 (for small-sized traffic and high-speed movement) and other transmission modes through UE RS-based schemes, whereas previously it could only support limited scenarios
2Device complexity
If non-backward compatible component carriers support only downlink transmission mode 9, then implementation complexity is reduced, but spectrum utilization and system capacity are decreased
Solution Approach 1:
The patent changes the reference signal type parameter from CRS to UE RS, and enables multiple transmission modes including mode 9, allowing the system to achieve higher spectrum utilization and system capacity while maintaining manageable implementation complexity through standardized UE RS-based procedures
Data Source
AI summary
The present invention discloses a method and an apparatus for transmitting control signaling. The method includes: determining that a physical downlink shared channel PDSCH transmission scheme for a non-backward compatible component carrier is a user equipment-specific reference signal UE RS-based non-precoding matrix indicator Non-PMI feedback transmission scheme or a UE RS-based up to 8 layer transmission scheme; and sending downlink control information DCI to a UE, where the DCI is used to indicate the determined PDSCH transmission scheme. The apparatus includes a determining module and a first sending module. The method and apparatus in embodiments of the present invention can expand application scenarios of the non-backward compatible component carrier, increase spectrum utilization of the system, and avoid a system capacity decrease problem caused by limitations on the application scenarios of the non-backward compatible component carrier.