PDSCH Repetition Control via Higher Layer Signaling
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Solution Overview
Problem
Current wireless communication systems face challenges in improving the reliability of Physical Downlink Shared Channel (PDSCH) transmission and reception, particularly in PDSCH repetition operations, due to issues with control information decoding and resource allocation.
Innovation Solution
A method is proposed where the base station excludes or skips Time Transmission Intervals (TTIs) containing control information based on the number of symbols in the control region during PDSCH repetition, allowing for decoding of PDSCH by the number of PDSCH repetitions, and uses higher layer signaling to indicate PDSCH repetition information without adding additional fields to the existing DCI format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PDSCH repetition is indicated using dynamic DCI based signaling, then transmission flexibility is improved, but DCI format complexity and overhead increase
Solution Approach 1:
The patent extracts the PDSCH repetition indication function from the dynamic DCI format and relocates it to higher layer signaling (RRC configuration). This separation removes the repetition indication burden from DCI, maintaining DCI simplicity while preserving transmission flexibility through pre-configured repetition patterns that can be activated dynamically through other DCI mechanisms.
Solution Approach 2:
The patent applies preliminary action by pre-configuring PDSCH repetition parameters (number of repetitions, time interval, resource allocation) through higher layer signaling before actual transmission. This allows the system to prepare multiple repetition patterns in advance, enabling flexible adaptation to different channel conditions without requiring complex real-time DCI modifications.
2Reliability
If additional fields are added to DCI format to indicate PDSCH repetition, then transmission reliability is improved, but processing overhead and complexity increase
Solution Approach 1:
The patent extracts PDSCH repetition indication from DCI fields and places it in higher layer signaling, thereby avoiding DCI format expansion. This maintains efficient DCI processing while ensuring reliable repetition transmission through pre-configured parameters that are explicitly signaled outside the time-critical DCI structure.
Solution Approach 2:
The patent introduces higher layer signaling as an intermediary between the MAC layer and physical layer for PDSCH repetition indication. This intermediary layer handles the complex repetition parameter configuration, allowing DCI to remain simple while still achieving reliable repetition transmission through the coordinated interaction between RRC-configured parameters and physical layer execution.
3Measurement precision
If control information is included in every TTI for PDSCH repetition, then decoding accuracy is improved, but latency and processing time increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring control parameters through higher layer signaling before PDSCH repetition transmission begins. This allows the UE to have control information available in advance, eliminating the need to wait for control information in every TTI while maintaining accurate decoding through pre-known parameters such as resource allocation and modulation schemes.
Solution Approach 2:
The patent enables continuous useful action by allowing PDSCH repetition to proceed without interruption from control information processing in each TTI. The UE can continuously decode PDSCH repetitions using pre-configured parameters, maintaining uninterrupted data reception while still achieving accurate decoding through the combination of pre-configured control information and actual received signals.
Data Source
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AI summary
The present specification proposes a method for transmitting and receiving a physical downlink shared channel (PDSCH) in a wireless communication system and a device supporting the same. More specifically, the method performed by a user equipment includes receiving, from a base station, a higher layer signal including first information about a configuration of an operation related to a PDSCH repetition, receiving, from the base station, second information related to a number of symbols of a control region, receiving, from the base station, downlink control information (DCI) including information related to a PDSCH repetition number based on the second information, and repeatedly receiving, from the base station, the PDSCH based on the DCI, wherein when the control region is configured with a specific number of symbols, a transmission time unit related to the control region is not included in transmission time units for a PDSCH repetition reception.