Flexible PDCCH Scheduling for Wireless Data Transmission
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Solution Overview
Problem
In wireless communication systems, the time-variant characteristic and resource limitations of channels lead to reduced resource utilization efficiency when a first communication node sends Physical Downlink Control Channels (PDCCHs) based on priorly notified information, causing fuzzy reception of Sounding Reference Signals (SRS) and Channel State Information (CSI) by the second communication node.
Innovation Solution
The method involves sending multiple PDCCHs at different candidate time domain positions, where the Physical Downlink Shared Channels (PDSCHs) indicated by the PDCCHs have the same time domain end position but different start positions, allowing the second communication node to determine the time domain positions of the PDSCHs based on the first received PDCCH, ensuring reliable data transmission and avoiding fuzzy reception of non-periodic SRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first communication node sends PDCCH based on priorly notified information, then the second communication node can determine time domain positions in advance, but the resource utilization efficiency is lowered due to time-variant channel characteristics
Solution Approach 1:
The patent applies dynamics by making the time domain position of PDSCH flexible rather than fixed. The second communication node determines the time domain position of PDSCH based on the actual detection position of PDCCH and a configured offset, allowing the system to adapt to time-variant channel conditions while maintaining reliable communication.
2Reliability
If the first communication node repeatedly sends control information on multiple subframes, then the reliability of receiving control information is improved, but the second communication node may send SRS and/or report CSI for multiple times causing fuzzy reception
Solution Approach 1:
The patent uses feedback by configuring a offset between PDCCH detection and PDSCH transmission that is known to both communication nodes. This allows the second node to determine the correct PDSCH position based on detected PDCCH, and enables the first node to predict when SRS/CSI will be sent, avoiding fuzzy reception while maintaining reliable control information transfer through repetition.
3Reliability
If the second communication node sends SRS signal according to last received control information indication, then the fuzzy reception problem is avoided, but the node requires knowing time domain position of last PDCCH in advance which reduces flexibility
Solution Approach 1:
The patent applies preliminary action by pre-configuring the offset between PDCCH detection position and PDSCH transmission position. This allows the second communication node to determine PDSCH time domain position in advance without reducing flexibility, as the offset configuration enables accurate prediction while maintaining adaptability in scheduling.
Data Source
AI summary
Provided are a data transmission receiving method, which includes that: a second communication node receives one or more Physical Downlink Control Channels (PDCCHs) from a first communication node, wherein when the second communication node receives multiple PDCCHs, Physical Downlink Shared Channels (PDSCHs) indicated by the multiple PDCCHs are located in the same serving cell, and the indicated PDSCHs have the same time domain end position and different time domain start positions. Also provided are a data transmission sending method and apparatus, a data transmission receiving apparatus, a storage medium and an electronic apparatus.