Dynamic Time Domain Resource Assignment Switching in 5G NR Terminals
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Solution Overview
Problem
Current communication systems face challenges in optimizing power consumption and transmission latency in terminal devices during data scheduling, particularly in 3GPP Release 16 new radio (NR) systems, where existing methods do not provide a reliable solution for dynamically switching time domain resource assignment sets, leading to inconsistent behavior between base stations and terminal devices.
Innovation Solution
A communication method that involves receiving and sending information on physical downlink control channels (PDCCH) to dynamically switch time domain resource assignment sets based on actual requirements, balancing power consumption and transmission latency, and ensuring consistency by using feedback information to validate new resource assignment sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device buffers data on the entire bandwidth during each PDCCH detection to determine the time-frequency domain resource location of the PDSCH, then the terminal device can accurately identify the scheduled resources, but the power consumption of the terminal device increases due to unnecessary buffering operations
Solution Approach 1:
The patent extracts only the necessary time-frequency domain resource location information from the PDCCH signaling that is relevant to the terminal device's scheduled resources, rather than buffering and processing the entire bandwidth data. This selective extraction reduces the buffering operation scope and lowers power consumption while maintaining accurate resource location identification.
Solution Approach 2:
The patent applies local quality by focusing processing resources on specific local regions (time-frequency resources) that are actually scheduled for the terminal device, rather than uniformly processing the entire bandwidth. The terminal device identifies and processes only the local resource allocations indicated by the PDCCH, reducing overall power consumption while maintaining measurement precision for scheduled resources.
2Use of energy by moving object
If the slot offset K is configured to be greater than 0 (cross-slot scheduling), then the terminal device power consumption is reduced by avoiding same-slot scheduling, but the transmission latency increases due to the time gap between PDCCH and scheduled PDSCH/PUSCH
Solution Approach 1:
The patent implements dynamic switching between different time domain resource assignment sets, allowing the slot offset K to be dynamically adjusted between 0 and values greater than 0 based on actual system conditions. This dynamic adaptation enables the terminal device to select cross-slot scheduling (K>0) to reduce power consumption when latency is not critical, or same-slot scheduling (K=0) when low latency is required, thus balancing power consumption and transmission latency dynamically.
Solution Approach 2:
The patent changes the parameter K (slot offset) dynamically by providing multiple time domain resource assignment sets with different K values and enabling dynamic switching between them. This parameter change allows the system to optimize the balance between power consumption and transmission latency by selecting appropriate K values based on actual communication conditions, rather than using a fixed K value.
3Adaptability or versatility
If the terminal device switches time domain resource assignment sets dynamically based on actual requirements, then the system can balance power consumption and transmission latency, but inconsistent behavior occurs between base station and terminal device due to lack of reliable switching mechanism
Solution Approach 1:
The patent implements feedback mechanisms where the terminal device sends feedback information (such as HARQ-ACK) to confirm successful reception and understanding of the switched time domain resource assignment set. This feedback loop ensures that both the base station and terminal device are synchronized about the active resource assignment set, maintaining consistency and reliability while enabling dynamic adaptability.
Solution Approach 2:
The patent applies preliminary action by having the base station indicate the new time domain resource assignment set in advance through PDCCH signaling before the terminal device actually uses it for scheduling. This advance indication allows the terminal device to prepare and validate the new configuration, ensuring both sides are synchronized and consistent before the switching takes effect, thus maintaining reliability while providing adaptability.
Data Source
AI summary
Communication methods and apparatuses are provided in this disclosure. One method includes: receiving, by a terminal device at time slot n, first downlink control information comprising a minimum slot offset value, wherein the minimum slot offset value is to be applied by the terminal device at time slot n+K, where K is a positive integer; receiving, by the terminal device at a time after the time slot n and before the time slot n+K, second downlink control information comprising the minimum slot offset value; and determining, by the terminal device, to apply the minimum slot offset value at the time slot n+K.