RIV Mapping Across Bandwidth Parts for Flexible NR Scheduling
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Solution Overview
Problem
In the fifth-generation radio access system standard (NR), the flexibility of scheduling data channels is limited due to the inconsistency between the bandwidth parts (BWP) where the data channel and the downlink control information (DCI) are located, and the frequency domain resource allocation (RA) field in the DCI, leading to inefficient interpretation of resource indication values (RIV).
Innovation Solution
A method to determine a resource indication value (RIV) by adjusting the number of bits based on the bandwidth parts (BWP) involved, using formulas such as r=└α·n+b┘ or r=└α·n┘, where α is a positive number and b is an integer, to accurately schedule data channels across different BWPs, and optionally adjusting the resource block group (RBG) configuration to enhance flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zero is padded before the most significant bit of the decoded frequency domain RA field to obtain RIV, then the RIV can be obtained in a standardized manner, but the quantity of virtual resource blocks corresponding to the RIV becomes very small and the scheduling flexibility is greatly limited
Solution Approach 1:
The patent changes the parameter of RIV calculation by introducing a mapping relationship between the frequency domain RA field and virtual resource blocks that is not based on simple zero-padding. The new method uses the formula: RIV = (start VRB index × (total VRBs + 1)) + (length - 1), which fundamentally changes how RIV is generated to enable more virtual resource block configurations while maintaining standardization.
2Device complexity
If the quantity of bits for frequency domain resource allocation is reduced to match the smaller BWP, then the DCI size is optimized, but the ability to indicate frequency domain resources in the larger second BWP is compromised
Solution Approach 1:
The patent introduces virtual resource blocks as an intermediary concept between the first BWP (where DCI is located) and the second BWP (where data channel is scheduled). The frequency domain RA field in the first BWP indicates virtual resource blocks, which then map to physical resource blocks in the second BWP. This intermediary layer allows the smaller RA field to effectively control resources in the larger second BWP without information loss.
Data Source
AI summary
This application provides methods and apparatuses for determining a resource indication value. One method includes: a terminal device receives downlink control information, which includes a resource indication value (RIV) determined based on a first bandwidth part and indicates a data channel occupying contiguous virtual resource blocks in a second bandwidth part. The terminal device then determines, based on the RIV, the contiguous virtual resource blocks in the second bandwidth part, and sends or receives the data channel in the contiguous virtual resource blocks.