Multi-slot Scheduling with Redundancy Version Sequences
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Solution Overview
Problem
Existing wireless communication systems do not support Hybrid Automatic Repeat Request (HARQ) operation when slots are aggregated, limiting the efficiency of error management in multi-slot scheduling.
Innovation Solution
The described techniques enable HARQ operation for aggregated transmission time intervals (TTIs) by indicating a redundancy version sequence for the communication of redundancy versions of a transport block within the aggregated TTIs, allowing for efficient error management and improved link efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If slots are aggregated to extend transmission time, then link efficiency is improved, but HARQ operation is not supported
Solution Approach 1:
The patent segments the aggregated slots into individual TTI units, each capable of carrying HARQ operations. By dividing the aggregated transmission into discrete time intervals with independent HARQ processes, the system maintains HARQ functionality while preserving the benefits of slot aggregation for improved link efficiency.
Solution Approach 2:
The patent introduces dynamic HARQ process management for aggregated slots, where HARQ processes are dynamically assigned and tracked across multiple slots. This dynamic approach enables HARQ operations to adapt to the aggregated slot structure, resolving the contradiction between aggregation benefits and HARQ support.
2Reliability
If redundancy versions are transmitted across aggregated TTIs, then error management is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring redundancy version sequences before transmission across aggregated TTIs. The base station determines and signals the RV sequence in advance, allowing the UE to prepare for incremental redundancy combining. This preliminary setup simplifies the actual transmission process and reduces real-time complexity while improving error management.
Solution Approach 2:
The patent changes the parameter of redundancy version assignment from static to sequential across aggregated TTIs. By systematically varying the RV parameter according to a predetermined sequence (e.g., RV0, RV2, RV3, RV1), the system achieves diverse redundancy transmissions without complex real-time decision-making, balancing error management improvement with acceptable system complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A wireless device may receive downlink control information corresponding to a transmission of a transport block over a plurality of transmission time intervals (TTIs). The wireless device may identify a redundancy version sequence for the transport block. The redundancy version may be a pre-defined sequence or may be configured by higher layer signaling based on sequence criterion. The wireless device may transmit or receive a plurality of redundancy versions of the transport block in the plurality of TTIs based at least in part on the redundancy version sequence. In some examples, the plurality of redundancy versions may be determined based at least in part on a starting redundancy version identified by another wireless device.