Multi-cell PDSCH Scheduling via Single DCI with Adaptive Time Offsets
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Solution Overview
Problem
Current 3GPP specifications limit scheduling flexibility for physical downlink shared channels (PDSCH) across multiple cells, restricting simultaneous scheduling with a single downlink control information (DCI) and imposing rigid processing time requirements that do not accommodate varying sub-carrier spacings and beam switching needs.
Innovation Solution
The method involves simultaneously scheduling multiple PDSCHs through a single DCI transmitted via a physical downlink control channel (PDCCH), with each PDSCH associated with a respective cell, and ensuring sufficient time offsets (K0 and K1 processing times) to allow for proper decoding and beam switching, enabling flexible scheduling and processing times that adapt to different sub-carrier spacings and cell configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple PDSCHs are simultaneously scheduled through a single DCI across multiple cells, then scheduling flexibility is improved, but processing time requirements become more complex due to varying sub-carrier spacings and beam switching needs
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the time offset K0 based on the sub-carrier spacing of different cells. When a cell uses a larger sub-carrier spacing, the patent reduces the corresponding time offset, thereby adapting the processing time requirements to match the specific parameters of each cell while maintaining flexible multi-cell scheduling
Solution Approach 2:
The patent introduces dynamic beam switching capabilities within the multi-cell scheduling framework. The beam switching timing is made flexible and adaptive to different cell configurations and sub-carrier spacings, allowing the system to dynamically adjust beam directions without being constrained by fixed timing requirements
2Reliability
If rigid processing time requirements are imposed on PDSCH scheduling, then decoding reliability is improved, but scheduling flexibility deteriorates
Solution Approach 1:
The patent changes the time offset parameter K0 based on sub-carrier spacing values. By establishing a relationship where larger sub-carrier spacings correspond to smaller time offsets, the patent maintains adequate decoding reliability for each cell type while enabling flexible scheduling across cells with different parameters
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 (PDSCH) 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).