TDD Timing Method for Short Transmission Intervals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing TDD-LTE timing design cannot be applied to a mechanism combining the new TDD frame structure and short transmission time intervals (sTTIs), as it fails to ensure proper uplink scheduling timing and downlink feedback timing.
Innovation Solution
A timing method is introduced that determines whether grouping is needed for uplink and downlink sTTIs, and if so, groups and pairs them, adding indication information to control signaling to ensure correct timing for uplink and downlink data scheduling, allowing for flexible scheduling based on the number of symbols in a sTTI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing TDD-LTE timing design is used, then the system operation is simple and stable, but it cannot ensure proper uplink scheduling timing and downlink feedback timing when combined with sTTIs
Solution Approach 1:
The patent segments the sTTI transmission into multiple groups, where each group contains multiple sTTIs. The timing design is then applied at the group level rather than individual sTTI level, which simplifies the timing management while ensuring proper scheduling and feedback timing. This segmentation approach allows the system to handle sTTI-based transmissions with reduced complexity compared to managing each sTTI individually.
Solution Approach 2:
The patent introduces dynamic timing parameters including configurable timing offsets (K1, K2, K3) and flexible group-based scheduling. The timing design adapts to different sTTI configurations and traffic requirements by dynamically adjusting these parameters, enabling proper uplink scheduling and downlink feedback timing while maintaining flexibility for various service types.
2Loss of time
If sTTI mechanism is introduced to reduce transmission latency, then the scheduling granularity is reduced and transmission latency is reduced, but the existing TDD timing design cannot be applied
Solution Approach 1:
By grouping multiple sTTIs into larger units, the patent enables the application of existing TDD timing designs at the group level while preserving the low-latency benefits of fine-grained sTTI scheduling. This segmentation allows legacy timing parameters to be applied to groups rather than individual sTTIs, bridging the gap between old and new frame structures.
Solution Approach 2:
The patent creates a universal timing design that works for both traditional subframe-based transmissions and sTTI-based transmissions. By introducing configurable parameters and group-based scheduling, the system can adapt the same timing framework to different transmission modes, maintaining versatility across various service requirements and frame structures.
3Reliability
If grouping is performed on uplink and downlink sTTIs, then the timing requirements are met, but the signaling overhead increases due to indication information
Solution Approach 1:
The patent applies partial indication by only signaling the group index and necessary timing offsets rather than providing explicit timing information for every individual sTTI. This partial action approach satisfies timing requirements while minimizing signaling overhead, as the actual transmission timing can be derived from the group-level indications combined with predefined patterns.
Solution Approach 2:
The patent introduces timing offset parameters (K1, K2, K3) as intermediaries that bridge the relationship between downlink and uplink timings. These intermediary parameters enable the system to convey timing relationships efficiently without requiring extensive explicit signaling, as they serve as compact representations of complex timing relationships.
Data Source
AI summary
A timing method for time division duplex communication, an uplink/downlink data scheduling method, a base station, and user equipment are provided. By determining whether grouping needs to be performed on uplink/downlink short transmission time intervals, it is determined, for different grouping requirements, whether addition of indication information to control signaling is required to indicate to user equipment an uplink short transmission time interval sequence number in an uplink short transmission time interval group for uplink data transmission or feedback to downlink data scheduling. Alternatively, addition of indication information to control signaling is not required, and uplink data transmission or feedback to downlink data scheduling is performed in an uplink short transmission time interval determined according to a default rule.