PDSCH Decoding Using TRP-Specific Pre-emption Indications
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently multiplexing Ultra-Reliable Low-Latency Communications (URLLC) traffic with traditional enhanced Mobile Broadband (eMBB) traffic due to URLLC's bursty and sporadic nature, which can degrade PDSCH decoding performance and spectral efficiency, especially when using coarse frequency pre-emption indications for multiple Transmission Reception Points (TRPs).
Innovation Solution
The proposed solution involves a method for decoding Physical Downlink Shared Channel (PDSCH) using pre-emption indications that differentiate between multiple Transmission Reception Points (TRPs) by associating each TRP with separate pre-emption indications, allowing for more precise resource allocation and minimizing interference between eMBB and URLLC transmissions, thereby enhancing spectral efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If coarse frequency pre-emption indications are used for multiple TRPs, then device complexity is reduced, but PDSCH decoding performance and spectral efficiency deteriorate
Solution Approach 1:
The pre-emption indication is segmented into multiple separate indications, each associated with a specific TRP. This allows the UE to determine which TRP's pre-emption indication is applicable based on the spatial filter or TCI state, enabling precise resource allocation per TRP while maintaining overall system reliability and decoding performance.
2Reliability
If separate pre-emption indications are used for each TRP, then PDSCH decoding performance and spectral efficiency improve, but device complexity increases
Solution Approach 1:
Different pre-emption indication structures are applied locally to different TRPs based on their specific characteristics. Each TRP has its own pre-emption indication associated with it, allowing optimized resource management for each transmission point while the UE selects the appropriate indication based on the active spatial filter or TCI state.
3Productivity
If URLLC traffic is dynamically multiplexed with eMBB traffic, then resource utilization efficiency improves, but interference between traffic types increases
Solution Approach 1:
The pre-emption indication acts as an intermediary mechanism that coordinates between URLLC and eMBB traffic. When URLLC traffic needs to be transmitted, the pre-emption indication signals the UE to puncture or rate-match the eMBB PDSCH resources, allowing efficient dynamic multiplexing while minimizing interference through controlled resource allocation.
Data Source
AI summary
PDSCH resource allocations can be received. Different PDSCH resource allocations of the PDSCH resource allocations can be associated with different spatial filters for a user equipment. A pre-emption indication that indicates pre-empted resources can be received. A determination can be made as to whether the pre-emption indication is applicable to a first or second PDSCH resource allocation, both the first and the second PDSCH resource allocations, or no PDSCH resource allocation. A first PDSCH corresponding to the first PDSCH resource allocation can be decoded based on no transmission being present for a UE in the pre-empted resources in response to determining the pre-emption indication is applicable to the first PDSCH resource allocation. The pre-emption indication can be a first pre-emption indication with a first bit-field size and can be indicated in a DCI containing a second pre-emption indication with a second bit-field size different than the first bit-field size.