Multi-Cell HARQ Process Indication Using Per-Carrier HPID Offsets
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving scheduling flexibility and reducing overhead when indicating hybrid automatic repeat request (HARQ) process identifiers for multiple cells, leading to increased latency and inefficiencies in multi-cell scheduling.
Innovation Solution
A UE determines separate HARQ process identifiers for each component carrier based on a first HPID and respective offsets indicated in control signaling, allowing for improved scheduling flexibility with reduced overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate HARQ process identifiers are indicated for each component carrier, then scheduling flexibility is improved, but control signaling overhead increases
Solution Approach 1:
The patent segments the HARQ process identifier indication into a common HPID field and per-CC offset fields. The common HPID provides the base identifier for all component carriers, while separate offset fields (one bit per CC) allow independent adjustment for each CC. This segmentation enables scheduling flexibility without requiring full separate HPIDs for each carrier, thus reducing overhead.
Solution Approach 2:
The patent applies local quality by allowing different HARQ process identifier configurations for different component carriers through per-CC offset fields. Each CC can have its HPID adjusted independently based on local scheduling needs, while sharing the common HPID structure. This enables flexible, carrier-specific HARQ process management without proportionally increasing overall signaling overhead.
2Adaptability or versatility
If HARQ process identifiers are indicated for multiple cells, then scheduling flexibility is improved, but latency increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the relationship between common HPID and per-CC offsets in the control signaling structure. The UE is provided with the common HPID and the set of per-CC offsets in advance, allowing it to quickly determine the complete HPID mapping for all component carriers without requiring lengthy individual HPID transmissions for each carrier. This reduces processing time and latency.
3Adaptability or versatility
If full separate HPIDs are used for each component carrier, then scheduling flexibility is maximized, but control signaling overhead increases significantly
Solution Approach 1:
The patent merges the HARQ process identifier structure by combining a common HPID field with per-CC offset fields into a unified control signaling format. Instead of transmitting complete separate HPIDs for each component carrier, the system transmits the common HPID once and then applies per-CC offsets to derive the individual carrier HPIDs. This merging approach maintains scheduling flexibility while significantly reducing control signaling overhead.
Solution Approach 2:
The patent applies parameter changes by transforming the HPID representation from absolute separate values for each carrier to a relative offset-based system. The per-CC offset fields modify the common HPID parameter to generate carrier-specific identifiers. This parameter transformation enables flexible HPID configuration across multiple carriers with minimal signaling bits required.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Some wireless communications systems may support hybrid automatic repeat request (HARQ) process number indication for multi-cell scheduling. In some cases, a user equipment (UE) may receive first control signaling including one or more parameters associated with a HARQ process. Additionally, the UE may receive second control signaling indicating scheduling information associated with a set of component carriers (CCs), where the scheduling information includes one or more HARQ process identifier (HPID) offsets, each associated with a respective CC. In some cases, the UE may determine an HPID associated with each CC of the set of CCs based on the one or more parameters in the first control signaling and a respective HPID offset from the one or more HPID offsets in the second control signaling.