HARQ Codebook Subpattern Adaptation for 5G Signaling
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Solution Overview
Problem
In 5G networks, HARQ codebooks are often configured semi-statically, leading to inefficient resource usage due to either oversized codebooks for varying transmission scenarios, resulting in padding and resource wastage, or frequent changes causing significant control signaling overhead.
Innovation Solution
Implementing a method that allows for flexible HARQ codebooks with limited signaling overhead, where the size of subpatterns in the codebook can be dynamically adapted based on scheduling assignments, enabling efficient acknowledgement information transmission across varying transmission scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the HARQ codebook is configured to have a large size to cover maximum transmission cases, then reliability of HARQ signaling is improved, but resource wastage increases due to padding for smaller transmission cases
Solution Approach 1:
The patent applies dynamics by making the HARQ codebook size adaptable rather than fixed. The codebook size is determined dynamically based on the actual number of downlink transmissions to be acknowledged, allowing the system to adjust between minimum and maximum sizes as needed. This resolves the contradiction by enabling the codebook to be large enough for reliability when needed, but small enough to avoid padding waste when fewer transmissions occur.
Solution Approach 2:
The patent changes the parameter of codebook size from a static configuration to a dynamic parameter that varies based on transmission conditions. By calculating the required codebook size based on the actual number of transmissions (rather than always using the maximum), the system optimizes resource usage while maintaining sufficient reliability for the current transmission scenario.
2Loss of substance
If the HARQ codebook size is reduced to avoid padding, then resource efficiency is improved, but control signaling overhead increases due to frequent size changes
Solution Approach 1:
The patent applies preliminary action by pre-defining a set of possible codebook sizes and their corresponding configurations. Rather than requiring dynamic signaling for every size change, the system prepares multiple predetermined codebook configurations in advance, allowing efficient selection based on current transmission conditions without excessive control overhead.
3Device complexity
If the HARQ codebook size is fixed semi-statically, then device complexity is reduced, but adaptability to varying transmission scenarios deteriorates
Solution Approach 1:
The patent resolves this contradiction by implementing a semi-dynamic approach where the codebook size can adapt to varying transmission scenarios through a controlled mechanism. The determination of codebook size based on actual transmission counts provides adaptability without requiring full dynamic reconfiguration, thus maintaining reasonable device complexity while improving scenario versatility.
Data Source
AI summary
There is disclosed a method of operating a user equipment in a radio access network. The method includes transmitting acknowledgement information reporting on subject transmissions based on a HARQ codebook. The HARQ codebook indicates a bit pattern of the acknowledgement information. The bit pattern has a plurality of subpatterns, each subpattern being associated to a different subdivision of a reception time interval to which the acknowledgement information pertains. Each subpattern includes a predetermined number of bits of acknowledgement information associated to subject transmissions of the subdivision. There are also disclosed related methods and devices.