UE-Specific HARQ Timeline Offsets for Uplink Collision Avoidance
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Solution Overview
Problem
In wireless communication systems, the alignment of HARQ timelines across all UEs leads to uplink capacity issues due to blocked transmission time intervals (TTIs) for carriers like NR and LTE, resulting in reduced system performance and increased control channel collisions.
Innovation Solution
Implementing UE-specific HARQ timeline offsets, where each UE has a unique offset defined in terms of time or TTI duration, allowing for per-UE reservation of TTIs for uplink HARQ transmissions, thereby avoiding collisions and enhancing uplink capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If HARQ timelines are aligned across all UEs, then system coordination is simplified, but uplink capacity is reduced due to blocked TTIs
Solution Approach 1:
The patent segments the unified HARQ timeline into UE-specific timelines by introducing individual offsets for different UEs. This allows the system to maintain the simplicity of coordinated timelines while enabling flexible resource allocation that prevents TTI blocking, thereby resolving the contradiction between ease of operation and uplink capacity.
Solution Approach 2:
The patent applies local quality by customizing the HARQ timeline offset for each individual UE based on its specific requirements and carrier configurations. This localized adjustment enables each UE to have optimized uplink capacity without affecting the overall system coordination mechanism.
2Reliability
If TTIs are reserved for uplink HARQ transmissions on a network level, then HARQ operations are standardized, but control channel collisions increase
Solution Approach 1:
The patent changes the timing parameter of HARQ transmissions by introducing UE-specific offsets. This parameter adjustment distributes transmissions across different time resources, maintaining standardization while reducing collisions on control channels.
3Reliability
If TTIs are blocked for HARQ transmissions, then error correction is ensured, but system performance decreases
Solution Approach 1:
The patent introduces dynamic UE-specific offsets that allow flexible adjustment of HARQ transmission timing. This dynamic approach ensures error correction functionality while optimizing system performance by preventing unnecessary TTI blocking through intelligent resource allocation.
Data Source
AI summary
Wireless communications systems may support user equipment (UE)-specific hybrid automatic repeat request (HARQ) timeline offsets such that transmission time intervals (TTIs) reserved for uplink HARQ transmissions are reserved on a per UE basis (e.g., TTIs are not reserved or designated on a network level or aligned across all or many UEs within the system). That is, UEs within a wireless communications system may employ a UE-specific offset for their respective HARQ timelines. UE-specific HARQ timeline offsets may be derived, by the UEs, explicitly or implicitly. Further, the network (e.g., a base station) may configure UE-specific HARQ timeline offsets to be distributed in time to avoid uplink HARQ transmission collisions between UEs, to eliminate the loss of TTIs for a second carrier operation (e.g., such as NR uplink) on a network wide basis, etc. The base station may then communicate with the UEs according to their corresponding UE-specific offset HARQ timelines.