Reference PDCCH Positioning for Reliable PDSCH Scheduling
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Solution Overview
Problem
Inconsistent determination of PDSCH transmission positions due to multiple DCIs in Rel-15 and Rel-16 specifications leads to incorrect reception of data information, as terminals fail to accurately determine the transmission resources of PDSCHs when DCI is transmitted in multiple symbols or time slots.
Innovation Solution
A method and apparatus for determining an information transmission position by a terminal, involving the use of a predefined rule to identify a reference transmission position based on higher layer signaling or predefined information, allowing accurate determination of transmission parameters for physical channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DCI is repeatedly transmitted in multiple symbols or time slots, then the reliability of control information transmission is improved, but the terminal cannot accurately determine the transmission position of PDSCH, resulting in inconsistent resource determination
Solution Approach 1:
The patent introduces a reference PDCCH as an intermediary element to mediate between multiple repeated DCI transmissions and the PDSCH resource determination. The reference PDCCH serves as a unique anchor point that both the terminal and network side use to consistently determine PDSCH transmission positions, resolving the inconsistency caused by receiving multiple DCI repetitions in different time slots.
Solution Approach 2:
Instead of determining PDSCH position based on each individual DCI reception time (which causes inconsistency), the patent inverts the approach by selecting a specific reference PDCCH from the repeated transmissions and using its position as the basis for all PDSCH resource determinations. This inversion ensures that both terminal and network side arrive at the same conclusion regardless of which DCI repetition is being considered.
2Ease of operation
If the terminal determines PDSCH position based on each received DCI independently, then the terminal can process each DCI autonomously, but this leads to false determination of PDSCH positions and failure to receive data information
Solution Approach 1:
The reference PDCCH acts as a mediator that guides the terminal's autonomous DCI processing. While the terminal still independently processes received DCIs, it uses the reference PDCCH as a reference point to filter and select the correct DCI for PDSCH scheduling, preventing false determinations while maintaining autonomous operation.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal determines the reference PDCCH based on predefined rules or network indication, and this determination feeds back into the PDSCH resource calculation process. This feedback loop ensures that autonomous processing aligns with network intent, preventing mismatches between transmitted and received data positions.
Data Source
AI summary
A method and apparatus for determining an information transmission position. The method includes upon receiving at least one control information DCI sent by a network side, a terminal determines a reference transmission position according to a predefined rule, the preset rule being predefined information or configured by high-layer signaling, and then determines, according to the reference transmission position, a transmission parameter of a first physical channel or first physical information. In this way, a transmission parameter of a first physical channel or first physical information can be determined according to a determined reference transmission position, thus avoiding the problem of a reception failure of transmitted data information or first physical information due to incorrect determination of a transmission position of the first physical channel or first physical information by a terminal, and ensuring the reliability of reception of the transmitted data information by the terminal.