PDSCH-Based Multiple DCI Transmission Under PDCCH Resource Limits
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting multiple downlink control information (DCI) messages over a physical downlink shared channel (PDSCH), particularly in scenarios where the physical downlink control channel (PDCCH) lacks sufficient resources, such as in traditional sub 6 GHz spectrum or millimeter wave frequencies.
Innovation Solution
The solution involves transmitting multiple DCI messages in a PDSCH by separately encoding each message into a single code block and rate matching them into the allocated PDSCH region, allowing for efficient delivery even when the PDCCH resources are inadequate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple DCI messages are transmitted over PDSCH, then the transmission efficiency and coding gain are improved, but the device complexity and processing requirements increase
Solution Approach 1:
The patent segments multiple DCI messages into separate code blocks within the PDSCH, allowing each message to be independently encoded and transmitted. This segmentation enables efficient transmission of multiple control messages without requiring separate PDCCH resources for each message, thereby improving transmission efficiency while managing complexity through structured organization.
Solution Approach 2:
The patent merges multiple DCI messages into a single PDSCH transmission, combining what would traditionally require multiple separate control channel transmissions into one consolidated message. This merging approach improves transmission efficiency by reducing the number of separate transmission operations while maintaining the ability to decode individual messages through the code block structure.
2Reliability
If PDCCH resources are used for DCI transmission, then the control information can be delivered reliably, but the resource utilization becomes insufficient when multiple messages need to be transmitted
Solution Approach 1:
The patent uses the PDSCH as an intermediary channel to transmit multiple DCI messages. Instead of relying solely on the PDCCH for all control information delivery, the system leverages the PDSCH's additional capacity to carry multiple code blocks containing DCI messages. This intermediary approach allows reliable delivery of multiple messages by utilizing the existing PDSCH infrastructure for control information transmission.
3Quantity of substance
If multiple DCI messages are rate matched into PDSCH region, then resource utilization is improved, but the decoding complexity and processing time increase
Solution Approach 1:
The patent performs rate matching and code block preparation in advance before the actual transmission. By pre-organizing multiple DCI messages into appropriately sized code blocks and preparing the rate matching parameters, the system optimizes resource utilization while minimizing processing time during transmission. The preliminary action of structuring the messages allows for more efficient real-time decoding.
Data Source
AI summary
The apparatus obtains a downlink control information (DCI) message transmitted in a physical downlink control channel (PDCCH). The DCI message may include control information for obtaining a plurality of downlink control information (DCI) messages included in a physical downlink shared channel (PDSCH). The apparatus receives the PDSCH including the plurality of DCI messages. The apparatus obtains one or more of the plurality of DCI messages in the PDSCH based on the control information.