Dynamic PDSCH Repetition Control for 5G URLLC Latency
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Solution Overview
Problem
Current wireless communication systems, particularly in next-generation 5G networks, face challenges in efficiently managing downlink control and data repetitions for ultra-reliable low-latency communication (URLLC) due to limitations in existing Radio Access Technologies (RATs, which impact decoding latency and power consumption, especially in scenarios requiring dynamic scheduling and multiplexing of different services.
Innovation Solution
The implementation of dynamic downlink control and data repetition mechanisms in User Equipment (UE) and New Radio (NR) base stations, where the number of repetitions is dynamically indicated through downlink control information (DCI), allowing for flexible scheduling, reduced decoding latency, and improved power efficiency by configuring the number of PDSCH transmissions and using different redundancy versions, thereby enhancing the system's ability to handle diverse services like eMBB and URLLC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of PDSCH repetitions is increased to improve reliability for URLLC, then decoding reliability is improved, but decoding latency and power consumption increase
Solution Approach 1:
The patent implements dynamic indication of the number of PDSCH repetitions through DCI format 1_1, allowing the base station to adaptively adjust the repetition count based on current channel conditions and service requirements. This dynamic mechanism enables the system to use fewer repetitions when possible (reducing latency) while ensuring sufficient repetitions are used when reliability is critical, thus resolving the contradiction between reliability and latency.
Solution Approach 2:
The patent introduces a repetition number indicator field in DCI that dynamically changes the parameter of repetition count. By encoding different repetition numbers (K=1, 2, 4, 8) in the DCI, the system can flexibly adjust the number of transmissions to match actual channel conditions, avoiding both excessive repetitions (which increase latency) and insufficient repetitions (which reduce reliability).
2Reliability
If the number of PDSCH repetitions is increased to improve reliability, then decoding reliability is improved, but power consumption increases
Solution Approach 1:
The dynamic indication mechanism allows the base station to adjust the repetition count in real-time based on channel quality and service requirements. When channel conditions are good or service requirements are less stringent, fewer repetitions are scheduled, reducing power consumption. When reliability is critical, the system dynamically increases repetitions only to the necessary level, avoiding wasteful power consumption from excessive repetitions.
Solution Approach 2:
By dynamically changing the repetition number parameter through DCI signaling, the system optimizes the balance between reliability and power consumption. The repetition count is adjusted to the minimum necessary value to achieve the required reliability, preventing unnecessary power consumption from excessive repetitions while ensuring sufficient repetitions for reliable decoding when needed.
3Device complexity
If fixed scheduling is used to simplify resource management, then scheduling complexity is reduced, but scheduling flexibility decreases
Solution Approach 1:
The patent implements dynamic scheduling by indicating the number of PDSCH repetitions through DCI format 1_1, which is transmitted for each scheduling instance. This allows the base station to flexibly adjust the repetition count and resource allocation based on real-time channel conditions and service requirements (eMBB or URLLC), achieving high scheduling flexibility without requiring complex semi-statical configuration procedures.
Solution Approach 2:
The DCI format 1_1 is designed to serve multiple purposes: it schedules PDSCH transmissions, indicates the number of repetitions, and supports both eMBB and URLLC services through a unified mechanism. This multi-functional approach maintains relatively simple scheduling procedures while achieving high flexibility and adaptability across different service types.
4Adaptability or versatility
If dynamic indication of repetition number is implemented to increase scheduling flexibility, then scheduling flexibility is improved, but control information overhead increases
Solution Approach 1:
The patent encodes the repetition number information in a compact DCI format 1_1, using an efficient encoding scheme that represents different repetition counts (K=1, 2, 4, 8) with minimal bits. This parameter encoding approach achieves high scheduling flexibility while minimizing the increase in control information overhead compared to fixed scheduling.
Data Source
AI summary
Technology for a user equipment (UE) operable for dynamic downlink (DL) control and data repetition for new radio (NR) ultra-reliable low-latency communication (URLLC) is disclosed. The apparatus can comprise one or more processors. The one or more processors can be configured to: decode a value of 5 a repetition number indicator from downlink control information (DCI); decode information on a physical downlink shared channel (PDSCH) transmission; and decode information on a number of repeated PDSCH transmissions, wherein the number of repeated PDSCH transmissions is equal to the value of the repetition number indicator.