HARQ Timing Determination Using Timing Advance Values
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Solution Overview
Problem
In cellular communication systems, ensuring reliable timing for uplink transmissions becomes complicated with the introduction of flexible timing scenarios, particularly with short Transmission Time Intervals (TTIs), as existing methods struggle to maintain synchronization and processing time alignment across different user equipment (UE) distances and capabilities.
Innovation Solution
A method is introduced where the processing timing for uplink signaling is determined based on a timing advance value and a processing duration value, allowing for flexible timing scenarios by using a look-up table to define HARQ feedback and UL grant timings based on the assigned timing advance value, thereby accommodating different UE capabilities and distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible timing scenarios with short TTIs are introduced, then system adaptability and productivity are improved, but timing reliability and synchronization become more difficult to maintain
Solution Approach 1:
The patent changes the parameter of processing timing by making it dependent on the timing advance value. Different UEs with different TA values are assigned different processing durations, allowing the system to adapt to flexible timing scenarios while maintaining reliability by ensuring each UE has sufficient processing time based on its specific TA value.
Solution Approach 2:
The patent introduces dynamic timing adjustment where the processing duration is not fixed but varies based on the timing advance value. This dynamic approach allows the system to maintain timing reliability across different UE distances and capabilities while supporting flexible short TTI operations.
2Reliability
If timing advance value is increased for UEs at greater distances, then synchronization is improved, but processing time becomes insufficient for maintaining reliable timing
Solution Approach 1:
The patent directly addresses this contradiction by making the processing duration parameter dependent on the timing advance value. UEs with larger TA values (greater distances) are assigned longer processing durations, ensuring they have sufficient time to process signals while maintaining synchronization through the TA mechanism.
3Device complexity
If fixed processing timing is used for all UEs, then device complexity is reduced, but adaptability to different UE capabilities and distances is limited
Solution Approach 1:
The patent resolves this contradiction by introducing a parameter-dependent timing mechanism. While the determination process involves checking TA values and selecting appropriate processing durations, this approach provides significant adaptability to different UE capabilities and distances, with the complexity managed through standardized procedures and tables.
Data Source
AI summary
There is disclosed a method for operating a user equipment in a cellular communication network. The method includes processing uplink, UL, signaling based on a processing timing. The processing timing is based on a timing advance value and a determined processing duration value in which the determined processing duration value is based on the timing advance value. The disclosure also pertains to related devices and methods.