Uplink Control Data Multiplexing via Codeword Segmentation
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Solution Overview
Problem
In LTE wireless communication systems, multiplexing uplink control information and user data poses challenges due to differing reliability and latency requirements, as well as inter-layer interference, which complicates the allocation of resources for effective transmission.
Innovation Solution
A method for allocating uplink resources in a wireless terminal for multi-layer transmission, where control information is channel-coded and distributed across transmission layers based on scheduling information and control allocation parameters, using transform precoding to generate code-domain layer data and spatial precoding to combine weighted transmitter outputs for efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control information and user data are multiplexed onto a single PUSCH, then resource utilization is improved, but decoding reliability of control information deteriorates due to shared resources with user data
Solution Approach 1:
The patent segments the transmission resources by separating control information and user data into different codewords (first and second codewords). Control information is mapped to the first codeword while user data is mapped to the second codeword, allowing independent encoding and transmission paths that prevent interference between control and data channels while utilizing the same physical uplink shared channel.
Solution Approach 2:
The patent introduces codeword-level multiplexing as an intermediary mechanism between the physical channel and the information types. By using separate codewords as intermediaries, control information and user data can be transmitted over the same PUSCH with distinct encoding parameters, ensuring control information receives appropriate protection while maintaining resource efficiency.
2Ease of operation
If different types of UCI are transmitted with the same reliability requirement, then transmission simplicity is improved, but system throughput deteriorates due to overly conservative error rate requirements for all control information
Solution Approach 1:
The patent applies different quality requirements to different control information types by assigning them to different codewords with different target error rates. CQI information can tolerate higher error rates (0.01) while Rank and A/N require lower error rates (0.001-0.0001). This local differentiation allows each control information type to be transmitted with appropriate reliability without unnecessarily constraining others.
Solution Approach 2:
The patent changes the reliability parameter (target error rate) based on the type of control information being transmitted. By adjusting the error rate requirement parameter according to the specific UCI type and its importance to system operation, the system achieves optimal throughput while maintaining necessary reliability for critical control signals.
3Productivity
If spatial multiplexing is used for PUSCH transmission, then data transmission rate is improved, but inter-layer interference increases complicating UCI multiplexing
Solution Approach 1:
The patent segments control information and user data into separate codewords that are processed through different encoding paths. This segmentation allows the receiver to separately decode control and data, reducing the impact of inter-layer interference on control information decoding while still enabling spatial multiplexing for high data rates.
Solution Approach 2:
The patent uses codeword-level processing as an intermediary layer between the spatial multiplexing transmission and the information types. This intermediary structure allows the system to benefit from spatial multiplexing gains while maintaining separate decoding paths that mitigate inter-layer interference effects on control information.
Data Source
AI summary
The present disclosure relates to resource allocation in multi-layer transmissions in transmissions of user data and control information. A wireless terminal allocates resources in a multi-layer transmission for one more types of control information based on scheduling information and control allocation parameters. The multi-layer transmission includes control information and one or more user data streams that are mapped to multiple transmission layers and transmitted by the wireless terminal.