Dynamic Physical Channel Repetition for Low Latency 5G
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency and enhancing reliability, particularly in next-generation networks like 5G, where diverse services and applications require improved performance dimensions.
Innovation Solution
The implementation of dynamic physical channel repetitions, utilizing downlink control information (DCI) to convey repetition configuration to user equipment (UE) devices, along with rate-matching behavior and resource sharing modes for initial transmissions and retransmissions, supports different redundancy versions and cycling across physical channel repetitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical channel repetitions are implemented, then reliability is improved, but latency increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring repetition levels and patterns through DCI signaling before actual data transmission. The gNB dynamically indicates the repetition level sequence in advance, allowing the UE to prepare for multiple repetitions without waiting for individual scheduling decisions, thus reducing the time penalty of reliability-enhancing repetitions.
Solution Approach 2:
The patent implements dynamics by enabling flexible, dynamic adjustment of repetition levels through DCI format 0_1 and 1_1 signaling. The system can adaptively change the repetition level sequence based on current channel conditions and traffic requirements, transitioning between different reliability-latency tradeoff points rather than being fixed to a single repetition configuration.
2Reliability
If physical channel repetitions are implemented, then data transmission robustness is improved, but spectrum efficiency deteriorates
Solution Approach 1:
The patent applies partial action by implementing selective repetition where only necessary transmissions are repeated based on configured repetition level sequences. The system uses DCI signaling to indicate specific repetition levels (e.g., 1, 2, 3, or 4 repetitions) rather than universally repeating all transmissions, thus achieving adequate robustness while avoiding excessive resource consumption that would harm spectrum efficiency.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the repetition level parameter through DCI signaling. The gNB can change the repetition level sequence parameter based on channel conditions, allowing the system to optimize the balance between transmission robustness and spectrum efficiency by selecting appropriate repetition levels for different traffic scenarios.
3Adaptability or versatility
If dynamic repetition configuration is implemented, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using existing DCI formats (0_1 and 1_1) for multiple purposes - both for scheduling uplink/downlink transmissions and for indicating repetition level sequences. This multi-functionality approach allows dynamic repetition configuration without requiring separate dedicated signaling channels, thereby limiting the increase in device complexity while maintaining high adaptability.
Solution Approach 2:
The patent implements copying by reusing the structure and fields of existing DCI formats to convey repetition level information. Rather than creating entirely new complex signaling mechanisms, the system copies and extends existing DCI formats with additional repetition-level-indicating fields, reducing the complexity burden on UEs while achieving dynamic adaptability.
Data Source
AI summary
An apparatus is configured for a next Generation NodeB (gNB). The apparatus comprises baseband circuitry and/or application circuitry which includes a radio frequency (RF) interface and one or more processors. The one or more processors are configured to determine a transmission mode for a user equipment (UE) device; dynamically determine a repetition level sequence for a physical downlink shared channel (PDSCH) based on a transmission time interval (TTI) and the transmission mode; generate repetition level signaling for the determined repetition level sequence; and provide the generated repetition level signaling to the RF interface for transmission to the UE device.