HARQ Process ID Configuration Across Mixed-Spacing BWPs
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently determining and managing the number of Hybrid Automatic Repeat Request (HARQ) processes and HARQ-ACK codebooks, particularly in scenarios with different subcarrier spacings and bandwidth parts (BWPs), which affect the performance and efficiency of data transmission.
Innovation Solution
A method and device for configuring the number of HARQ processes and generating Type-3 HARQ-ACK codebooks based on subcarrier spacings, allowing up to 32 HARQ processes to be supported in BWPs with subcarrier spacings of 480 kHz or 960 kHz, and determining the number of bits in the HARQ process number field or HARQ-ACK bitmap field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of HARQ processes is increased to support higher data transmission rates, then the data transmission capacity is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the number of HARQ processes based on subcarrier spacing configurations. When the first SCS is 480 kHz or 960 kHz, the system configures 32 HARQ processes; when the second SCS is other values, fewer HARQ processes are used. This adaptive parameter adjustment optimizes data transmission capacity while controlling processing overhead according to actual channel conditions and service requirements.
2Adaptability or versatility
If different subcarrier spacings are configured for different bandwidth parts to support diverse services, then the service adaptability is improved, but the determination of HARQ process number and codebook generation becomes more complex
Solution Approach 1:
The patent implements local quality by associating different HARQ process configurations with specific subcarrier spacing values. Each bandwidth part with a particular SCS configuration receives an optimized HARQ process number, creating localized optimization rather than a uniform system-wide configuration. This allows the system to tailor HARQ parameters to local channel conditions and service requirements while maintaining overall system coherence.
Solution Approach 2:
The patent applies segmentation by dividing the HARQ configuration space into distinct segments based on subcarrier spacing values. The system segments HARQ process determination into different cases: one segment for 480 kHz/960 kHz SCS configurations and another for other SCS values. This segmentation simplifies the overall complexity by breaking down the HARQ configuration problem into manageable, condition-specific segments.
3Measurement precision
If a Type-3 HARQ-ACK codebook is generated with explicit HARQ process number fields, then the HARQ-ACK information accuracy is improved, but the uplink control channel payload size increases
Solution Approach 1:
The patent applies partial action by selectively including HARQ process number fields in the Type-3 HARQ-ACK codebook only when necessary. Rather than always including complete HARQ process information, the system includes explicit HARQ process number fields only when the subcarrier spacing configuration requires it (e.g., when first SCS is 480 kHz or 960 kHz). This partial inclusion maintains HARQ-ACK information accuracy where needed while reducing overall payload size.
Data Source
AI summary
The present disclosure provides a method performed by a terminal in a wireless communication system. The method comprising the steps of: receiving first information for setting the number of HARQ processes associated with a PDSCH; confirming whether a first SCS for a first BWP is set to 480 kHz or 960 kHz; confirming whether a second SCS for a second BWP is set to a value other than 480 kHz and 960 kHz; and receiving the PDSCH on the basis of the first BWP or the second BWP, wherein the number of HARQ processes can be supported up to 32 in the second BWP in which the second SCS is set, if 32 HARQ processes set on the basis of the first information are associated with the first SCS.