Sidelink TBS Calculation Using PSSCH DMRS Resource Elements
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Solution Overview
Problem
Existing 5G communication protocols lack clear guidelines for determining transport block size (TBS) in sidelink channels, particularly in scenarios where uplink and sidelink transmissions overlap, and there is no support for multiplexing sidelink HARQ and Uu UCI, leading to unclear prioritization and resource allocation.
Innovation Solution
A method and apparatus for determining a physical downlink shared channel scheduling resource by selecting and grouping component carriers from licensed and unlicensed bands, forming a virtual component carrier, and prioritizing transmissions based on these carriers to optimize TBS calculation and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If component carriers from licensed and unlicensed bands are selected and grouped to form a virtual component carrier, then resource allocation efficiency and transmission reliability are improved, but system complexity and calculation overhead increase
Solution Approach 1:
The patent combines multiple component carriers from licensed and unlicensed bands into a single virtual component carrier. This merging approach allows the system to leverage both licensed band reliability and unlicensed band capacity while presenting a unified interface for resource allocation, thereby improving overall transmission reliability without requiring separate handling of each carrier type.
Solution Approach 2:
The virtual component carrier acts as an intermediary layer between the physical component carriers and the resource allocation mechanism. This abstraction simplifies the system by providing a unified interface for scheduling and resource management, reducing the complexity of handling multiple heterogeneous carriers while maintaining their individual characteristics.
2Productivity
If multiple component carriers are grouped and processed together, then resource allocation efficiency improves, but calculation time and processing overhead increase
Solution Approach 1:
The patent performs preliminary grouping of component carriers into a virtual carrier structure before resource allocation decisions are made. This pre-processing step organizes the carriers in advance, allowing the scheduling algorithm to operate on a simplified structure rather than individually managing multiple carriers, thereby reducing real-time calculation time while maintaining allocation efficiency.
3Productivity
If virtual component carrier is formed from multiple component carriers, then spectral efficiency improves, but signal processing complexity increases
Solution Approach 1:
The virtual component carrier provides a universal interface that handles multiple functions: it manages both licensed and unlicensed band carriers, performs resource allocation, and presents a unified spectrum resource view to higher layers. This multi-functionality improves spectral efficiency by enabling coordinated resource usage across different band types while consolidating signal processing tasks into a single processing entity.
Data Source
AI summary
A method determines a number of physical sidelink shared channel (PSSCH) symbols and a number of PSSCH demodulation reference signal (DMRS) symbols that will occur in a timeslot that is used for scheduling. PSSCH DMRS locations in the timeslot are derived based on applying the PSSCH DMRS symbols and the PSSCH DMRS symbols to a look-up table. A number of PSSCH DMRS resource elements (REs) is calculated based on the PSSCH DMRS locations and a scheduled number of PSSCH sub-channels. This number of PSSCH DMRS RES is used to determine a transport block size (TBS) included in transmissions over a sidelink channel.