Downlink Frequency Resource Allocation for Group-Common PDSCH
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, there is a challenge in efficiently allocating frequency domain resources for multicast and broadcast services (MBS) due to varying active bandwidth parts (BWP) among user equipment (UEs), leading to difficulties in determining a common frequency resource and payload size for group-common PDSCH transmissions.
Innovation Solution
A common frequency region is configured for a group of UEs through RRC signaling, with a shared CORESET, using resource allocation types 0 or 1, and a unified reference point for RB numbering to ensure all UEs can receive group-common PDSCH without BWP switching, and the payload size is determined based on the common frequency region or UE's BWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate frequency resources are allocated for each UE based on their individual active BWPs, then each UE can receive PDSCH efficiently within its own BWP, but determining a common frequency resource for group-common PDSCH becomes difficult and complex
Solution Approach 1:
The patent creates a common frequency region that serves multiple UEs with different active BWPs simultaneously. This universal resource pool allows group-common PDSCH to be transmitted to multiple UEs without requiring separate resource allocation procedures, thus resolving the contradiction between individual UE efficiency and group allocation complexity
Solution Approach 2:
The patent segments the frequency spectrum into a common frequency region and individual BWP regions. The common frequency region is specifically designated for group-common PDSCH transmissions, while individual BWPs handle UE-specific traffic. This segmentation allows simultaneous support for both individual and group communications without interference
2Adaptability or versatility
If different UEs use different active BWPs for group-common PDSCH reception, then each UE can operate within its optimized bandwidth, but BWP switching overhead increases and reception consistency decreases
Solution Approach 1:
The patent pre-configures a common frequency region that all UEs can access without BWP switching. By establishing this universal access region in advance through RRC signaling, UEs avoid the need to switch BWPs during group-common PDSCH reception, thereby eliminating switching overhead and ensuring reception consistency
3Measurement precision
If payload size is determined based on each UE's individual BWP, then payload sizing is accurate for each UE, but determining a unified payload size for group-common DCI becomes complex
Solution Approach 1:
The patent establishes a universal payload size determination method based on the common frequency region. The group-common DCI payload size is calculated using the total number of RBs in the common frequency region, which serves all UEs uniformly. This universal approach simplifies the determination process while maintaining accuracy for all receiving UEs
Data Source
AI summary
Embodiments of the present disclosure relate to frequency domain resource allocation for downlink transmissions. According to some embodiments of the disclosure, a method for wireless communication performed by a user equipment (UE) may include: receiving a physical downlink control channel (PDCCH) within a control resource set (CORESET), wherein the PDCCH carries a downlink control information (DCI) format for scheduling a physical downlink shared channel (PDSCH); and receiving the PDSCH on a plurality of resource blocks (RBs) based on the DCI format, wherein the plurality of RBs are within a frequency region.