PUSCH Interleaving for UCI and User Data Multiplexing
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Solution Overview
Problem
In 5G wireless communication systems, there is a need to efficiently transmit uplink control information (UCI) with limited power availability, particularly in scenarios where User Equipment (UE) is near the cell border, and existing methods may not effectively manage the transmission of UCI and user data in self-contained Time Division Duplex (TDD) subframes.
Innovation Solution
The UCI information is multiplexed with non-control uplink data and transmitted in the Physical Uplink Shared Channel (PUSCH), with interleaving techniques used to map control information in a time-first direction and user data in a frequency-first direction, allowing for efficient transmission of beam forming information and other control data alongside user data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UCI and user data are transmitted separately in different channels, then channel reliability is improved, but device complexity and transmission overhead increase
Solution Approach 1:
The patent combines UCI and user data into a single transport block for transmission over the PUSCH channel. The encoder receives both UCI and user data as inputs and generates a single coded output that contains both types of information, eliminating the need for separate channel transmissions and reducing overall system complexity while maintaining reliability
2Device complexity
If UCI and user data are multiplexed in the same channel, then device complexity is reduced, but interference between control and user data increases
Solution Approach 1:
The patent applies segmentation by dividing the coded bits into separate groups - one group for UCI and another for user data. The interleaver then processes these segmented groups differently, applying time-first mapping to UCI and frequency-first mapping to user data, which separates their resource allocation and reduces mutual interference while maintaining the benefits of combined transmission
3Ease of operation
If conventional interleaving is used without direction-specific mapping, then processing simplicity is maintained, but transmission efficiency in low latency scenarios deteriorates
Solution Approach 1:
The patent introduces dynamic, direction-specific mapping strategies that adapt to the characteristics of different data types. The interleaver dynamically applies time-first mapping for UCI to prioritize control information delivery in low latency scenarios, while applying frequency-first mapping for user data to optimize throughput, thereby improving transmission efficiency without significantly complicating the processing
Data Source
AI summary
Control information may be multiplexed, by User Equipment (UE), with non-control uplink data (e.g., user data) and transmitted in the PUSCH. In one implementation, in combining the control information and the user data, the control information and the user data may be interleaved in a manner in which the control information is mapped in a time-first direction and the user data is mapped in a frequency-first direction. Additionally, the control information may include beam information (BI).