CG-SDT Retransmission with Comparable TBS Uplink Grants
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Solution Overview
Problem
In current CG-SDT systems, terminal devices face issues with retransmitting initial transmissions due to the need to select the same SSB for retransmission, even when different Transport Block Sizes (TBS) are associated with multiple CG configurations, requiring rebuilding of MAC PDUs.
Innovation Solution
A method and apparatus that allow the selection of a first configured uplink grant for retransmission with a comparable or larger TBS for CG-SDT, enabling retransmission without rebuilding the MAC PDU, and optionally adding padding to accommodate different TBS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device selects the same SSB for retransmission as used for initial transmission, then the retransmission can be performed on pre-configured UL resources, but the terminal device must rebuild MAC PDUs when different TBS are associated with multiple CG configurations
Solution Approach 1:
The patent changes the TBS parameter selection criterion from 'must match initial transmission TBS' to 'comparable TBS from available CG configurations'. This allows the terminal device to select a CG configuration with a comparable TBS for retransmission without requiring MAC PDU rebuilding, thus resolving the contradiction between retransmission reliability and device complexity
Solution Approach 2:
The patent introduces dynamic selection of CG configuration for retransmission based on available configurations with comparable TBS, rather than being statically bound to the same SSB and TBS as initial transmission. This dynamic approach allows flexibility in selecting appropriate CG configurations while maintaining retransmission reliability
2Adaptability or versatility
If multiple CG configurations are associated with the same SSB with different TBS, then the system has more flexibility in resource allocation, but the terminal device cannot select different CG configurations for retransmission without causing issues
Solution Approach 1:
The patent modifies the retransmission operation by changing the selection criterion from 'same SSB only' to 'comparable TBS from any CG configuration'. This parameter change maintains operational simplicity while leveraging the flexibility of multiple CG configurations with different TBS values
Solution Approach 2:
The patent makes the retransmission mechanism universal by allowing any CG configuration with comparable TBS to be used for retransmission, not just the original SSB-associated configuration. This multi-functionality approach enables the terminal device to utilize any suitable CG configuration while maintaining ease of operation
3Loss of energy
If the terminal device performs autonomous retransmission without receiving confirmation before timer expiry, then the signaling overhead is reduced, but the terminal device must follow strict rules about selecting the same SSB which limits efficiency
Solution Approach 1:
The patent changes the retransmission parameter selection from 'same SSB and TBS' to 'comparable TBS from available CG configurations'. This parameter change enables more efficient autonomous retransmission by allowing the terminal device to select from multiple CG configurations while maintaining low signaling overhead
Solution Approach 2:
The patent enhances the self-service capability of autonomous retransmission by enabling the terminal device to independently select appropriate CG configurations with comparable TBS without network intervention. This self-service mechanism improves retransmission efficiency while maintaining low signaling overhead
Data Source
AI summary
Embodiments of the present disclosure relate to for enabling retransmission of an initial transmission of CG-SDT. A first device selects a first configured uplink grant for retransmission of an initial transmission of CG-SDT. A first TBS associated with the first configured uplink grant is comparable to a second TBS associated with a second configured uplink grant for the initial transmission of CG-SDT. The first device performs the retransmission to a second device based on the first configured uplink grant.