Multi-Cell PDSCH Scheduling via Single DCI
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Solution Overview
Problem
Current wireless communication technologies, particularly in 3GPP specifications, face limitations in scheduling physical downlink shared channels (PDSCHs) across multiple cells, with restrictions on cross-cell group scheduling and lack of support for simultaneous scheduling of multiple cells using a single downlink control information (DCI).
Innovation Solution
The method involves simultaneously scheduling multiple PDSCHs through a single DCI transmitted via a physical downlink control channel (PDCCH), allowing each PDSCH to be associated with a respective cell, and includes specific time offsets (K0 and K1 processing times) to ensure proper data processing and HARQ-ACK transmission, enabling analog beam switching by the user equipment (UE).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple PDSCHs are scheduled simultaneously through a single DCI across multiple cells, then scheduling flexibility and efficiency are improved, but processing time and timing coordination become more complex
Solution Approach 1:
The patent segments the scheduling process by introducing separate time offset parameters (K0 for PDSCH scheduling offset, K1 for HARQ-ACK timing offset) for each scheduled cell. This allows independent timing control for each PDSCH across different cells, managing the complexity of multi-cell simultaneous scheduling through structured parameter separation.
Solution Approach 2:
The patent establishes preliminary timing relationships by defining fixed time offsets between PDCCH and PDSCH (K0) and between PDSCH and HARQ-ACK (K1) before actual data transmission occurs. This preliminary timing coordination enables the UE to prepare for multi-cell reception and processing in advance, managing complexity through pre-defined timing structures.
2Productivity
If multiple PDSCHs are scheduled simultaneously through a single DCI, then data transmission efficiency is improved, but timing synchronization and processing deadlines become more challenging
Solution Approach 1:
The patent introduces configurable time offset parameters (K0 and K1) that can be adjusted based on UE processing capabilities and network requirements. By changing these timing parameters, the system optimizes the balance between transmission efficiency and processing time, allowing flexible adaptation to different scenarios while maintaining reliable multi-cell simultaneous scheduling.
3Ease of operation
If cross-cell group scheduling is restricted as in previous specifications, then scheduling simplicity is maintained, but scheduling versatility and multi-cell support are limited
Solution Approach 1:
The patent enables a single DCI to serve multiple cells across different cell groups, making the scheduling mechanism universal. The same DCI structure and timing parameters (K0, K1) apply regardless of which cells are being scheduled, allowing the system to maintain operational simplicity while achieving versatile multi-cell group scheduling capability.
Data Source
AI summary
Described are processing time approaches to simultaneous multi-cell PUSCH/PDSCH scheduling with a single DCI (downlink control information) in a wireless communication system. In various approaches, simultaneously scheduling a plurality of physical downlink shared channels (PDSCHs) through a single DCI transmitted via a physical downlink control channel (PDCCH) occurs, wherein each of the plurality of PDSCHs is associated with a respective cell in a plurality of cells. The approaches further include transmitting data to or receiving data to a user equipment (UE) based on the scheduling information, wherein the plurality of PDSCHs occurs no earlier than a time offset following the PDCCH. In other aspects, a hybrid automatic repeat request-acknowledgement (HARQ-ACK) is received via a physical uplink control channel (PUCCH), the HARQ-ACK having been sent by a user equipment (UE) in response to one of the plurality of PDSCHs, wherein the HARQ-ACK is sent no earlier than a time offset following a reference time in one of the plurality of PDSCHs. In other aspects, transmitting data to or receiving data to a user equipment (UE) is based on the scheduling information, wherein the plurality of PDSCHs occurs no earlier than a time offset following the PDCCH, the time offset being configured to permit analog beam switching by a user equipment (UE).