PDSCH Demodulation in CSI-RS Resources for MTC Coverage
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Solution Overview
Problem
Current wireless communication systems face challenges in enhancing coverage, particularly for machine type communication (MTC) in scenarios where traditional methods are inefficient, leading to suboptimal signal transmission and reception.
Innovation Solution
The method involves a UE receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) in a subframe with CSI-RS resources, with demodulation assumptions adjusted based on predetermined conditions, such as reception of information indicating PDSCH non-transmission or repeated transmission, to optimize signal processing and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDSCH is transmitted in CSI-RS resources, then resource utilization is improved, but demodulation accuracy deteriorates due to signal interference
Solution Approach 1:
The patent implements dynamic adaptation by allowing the UE to switch between two demodulation assumptions based on received indication information. When CSI-RS is transmitted, the UE assumes PDSCH is not transmitted in those resources; when CSI-RS is not transmitted, the UE assumes PDSCH can be transmitted. This dynamic switching resolves the contradiction by adapting the demodulation behavior to actual transmission conditions.
Solution Approach 2:
The patent changes the demodulation parameter (assumption about PDSCH transmission in CSI-RS resources) based on the transmission state of CSI-RS. By receiving indication information from the network, the UE adjusts its demodulation assumption parameter to match the actual resource allocation state, thereby maintaining demodulation accuracy while enabling flexible resource utilization.
2Reliability
If coverage enhancement is implemented for MTC, then signal reception is improved, but system overhead increases
Solution Approach 1:
The patent enables the UE to self-determine the appropriate demodulation assumption by processing received indication information autonomously. The UE independently decides whether to assume PDSCH transmission in CSI-RS resources based on the indication, without requiring complex network-side coordination or additional overhead signaling for each demodulation decision. This self-service mechanism improves signal reception while minimizing system overhead.
3Reliability
If repeated transmission is used for MTC coverage enhancement, then coverage is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by using repeated transmission only when necessary for coverage enhancement, rather than continuously. The UE dynamically adjusts its demodulation assumption based on received indications, enabling repeated transmission to be applied selectively in coverage-limited scenarios while avoiding unnecessary repetitions in good coverage conditions, thereby reducing overall power consumption while maintaining coverage improvement where needed.
Data Source
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AI summary
The present invention relates to a wireless communication system. In particular, the present invention relates to a method and an apparatus for receiving data, by a terminal, in a wireless communication system, the method comprising the steps of: receiving a PDCCH; receiving a PDSCH corresponding to the PDCCH in a subframe including CSI-RS resource available in a cell; and demodulating the PDSCH. If a predetermined condition is satisfied, demodulation of the PDSCH is performed on the assumption that the PDSCH is not transmitted in the CSI-RS resource available in the cell, and if the predetermined condition is not satisfied, the demodulation of the PDSCH is performed on the assumption that the PDSCH can be transmitted in the CSI-RS resources available in the cell.