CBG Set Indexing for HARQ Feedback in 5G Wireless
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Solution Overview
Problem
Current wireless communication systems, such as LTE and 5G, face challenges in efficiently handling code block group (CBG)-based transmissions, which affect the accuracy and reliability of Hybrid Automatic Repeat Request (HARQ) feedback messages between network and user equipment (UE).
Innovation Solution
A communication device and method that configures and generates CBG sets, cumulative indices, and downlink control information (DCIs) to facilitate CBG-based transmission, enabling accurate HARQ feedback by transmitting these indices to the UE via a network processing circuit and storage device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CBG-based transmission is implemented to improve data transmission efficiency, then productivity is improved, but device complexity increases due to the need to generate and manage multiple CBG sets, cumulative indices, and DCIs
Solution Approach 1:
The patent segments the transmission data into multiple Code Block Groups (CBGs) organized in sets, where each CBG set contains multiple CBGs. This segmentation allows the system to transmit and manage data in smaller, more controllable units, improving transmission efficiency while enabling selective retransmission of only failed CBGs rather than entire transport blocks.
Solution Approach 2:
The network side performs preliminary actions by pre-generating multiple CBG sets and their corresponding cumulative indices before transmission. The Downlink Control Information (DCI) messages are prepared in advance with embedded CBG set indicators and cumulative indices, allowing the user equipment to efficiently identify and process only the relevant CBGs without exhaustive searching.
2Reliability
If multiple DCIs with CBG sets and indices are transmitted to enable accurate HARQ feedback, then reliability is improved, but loss of information increases due to the additional control signaling overhead
Solution Approach 1:
The patent extracts and transmits only the essential information needed for HARQ feedback - specifically the CBG set indicators and cumulative indices - within the DCI messages. This selective extraction ensures that the user equipment receives precisely the information required to generate accurate HARQ feedback without being burdened by unnecessary control signaling overhead.
Solution Approach 2:
The system implements a feedback mechanism where the user equipment generates HARQ feedback messages based on the received CBG sets and cumulative indices from multiple DCIs. The feedback includes acknowledgment information for each CBG set, allowing the network to identify and retransmit only the failed CBGs, thereby improving reliability while minimizing redundant transmissions.
3Loss of time
If CBG-based transmission is configured to allow selective retransmission, then loss of time is reduced by avoiding retransmission of successfully received data, but device complexity increases due to tracking and managing multiple CBG states
Solution Approach 1:
The network side performs preliminary organization of CBGs into multiple sets with cumulative indices before transmission. This preliminary structuring enables the user equipment to efficiently track CBG states by referencing the pre-defined CBG set indicators in the received DCIs, reducing the complexity of real-time state management during retransmission operations.
Solution Approach 2:
By segmenting CBGs into manageable sets with unique identifiers and cumulative indices, the system enables selective tracking and retransmission of individual CBG sets. This segmentation reduces the overall complexity of state management compared to tracking individual CBGs separately, as the equipment can manage states at the set level while still achieving fine-grained control.
Data Source
AI summary
A network for handling a CBG-based transmission comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The storage device stores, and the processing circuit is configured to execute instructions of configuring a CBG-based transmission to a communication device; generating a plurality of CBG sets; generating a plurality of cumulative indices for the plurality of CBG sets, respectively, and generating a total index for the plurality of CBG sets; generating a plurality of downlink control informations (DCIs), wherein each of the plurality of DCIs comprises information indicating a size of a corresponding one of the plurality of CBG sets, a corresponding one of the plurality of cumulative indices and the total index; and transmitting the plurality of DCIs and the plurality of CBG sets to the communication device via the CBG-based transmission.