Multi-PDSCH Grant Scheduling With TB2 Disable Signaling
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face inefficiencies in managing multiple transport block (TB) configurations in multi-physical downlink shared channel (PDSCH) grants, leading to increased control signaling overhead and processing complexity for user equipment (UEs).
Innovation Solution
A network node configures a UE with a single downlink control information (DCI) to schedule multiple PDSCH transmissions, enabling or disabling a second TB through a specific combination of modulation and coding scheme (MCS) and redundancy version (RV) in the DCI, reducing control signaling and processing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transport block configurations are supported in multi-PDSCH grants, then scheduling flexibility and resource allocation efficiency are improved, but control signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts the second transport block indication from the DCI by using a reserved bit in the MCS field. Instead of adding a separate indication field for TB2, the system repurposes an existing reserved bit to indicate whether TB2 is enabled or disabled. This approach maintains scheduling flexibility while avoiding additional control signaling overhead.
Solution Approach 2:
The reserved bit in the MCS field serves multiple functions: it maintains backward compatibility with existing single-TB configurations while enabling multi-TB indication when needed. This multi-functional use of the reserved bit allows the system to support both single-TB and multi-TB scenarios without requiring separate signaling mechanisms.
2Productivity
If multiple transport block configurations are supported in multi-PDSCH grants, then resource allocation efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The patent extracts the TB2 indication information from what would traditionally be wasted reserved bits in the DCI. By repurposing these unused bits to carry meaningful information about TB2 enablement, the system achieves efficient resource allocation without increasing control signaling overhead.
Solution Approach 2:
The system changes the interpretation of the MCS field parameters by utilizing the reserved bit to encode TB2 indication information. This parameter change allows the same DCI structure to convey additional information about multi-TB configuration without requiring additional signaling resources.
3Ease of operation
If second transport block is disabled for each PDSCH in multi-PDSCH grant, then processing complexity for UE is reduced, but scheduling flexibility is limited
Solution Approach 1:
The patent implements dynamic TB2 enablement/disabling through the reserved bit indication in the DCI. The network can dynamically switch between single-TB and multi-TB modes on a per-grant basis, allowing UEs to process only what is necessary for each specific transmission while maintaining overall system flexibility.
Solution Approach 2:
The system extracts the TB2 indication from the reserved bit, allowing UEs to quickly determine whether to process single-TB or multi-TB configurations without complex interpretation logic. This extraction approach simplifies UE processing while preserving scheduling flexibility through the network's ability to indicate different configurations.
Data Source
AI summary
A network node may configure a UE with more than one codeword transmission for each PDSCH and transmit DCI including multi-PDSCH grant scheduling multiple PDSCHs. The DCI may include an indication that a second TB is disabled for each PDSCH indicated by the multi-PDSCH grant. The UE may receive the DCI including multi-PDSCH grant scheduling multiple PDSCHs, the DCI including the indication that the second TB is disabled for each PDSCH indicated by the multi-PDSCH grant, and understand that the multiple PDSCHs scheduled by the multi-PDSCH grant. In one aspect, the indication may include a combination of the MCS and RV value of the associated multiple PDSCHs. In another aspect, the indication may include a pattern of the RV vector (or RVID) values of associated multiple PDSCHs.