Uplink Control Information Mapping Across Multiple Layers
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Solution Overview
Problem
In future wireless communication systems with enhanced carrier aggregation, the increased amount of uplink control information, such as channel state information and acknowledgment/not-acknowledgment signals, poses a challenge for efficient transmission by user equipment.
Innovation Solution
A method and user equipment that determine the number of transport blocks for the physical uplink shared channel, duplicate and map uplink control information across multiple layers, and selectively include channel quality and precoding matrix indicators in transport blocks, allowing for efficient transmission without concurrent data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If enhanced carrier aggregation is implemented to aggregate up to 32 carriers, then the data rate capability is improved, but the amount of uplink control information to be transmitted increases significantly
Solution Approach 1:
The patent transitions from traditional single-layer PUSCH transmission to multi-layer transmission by utilizing spatial diversity (multiple antenna layers). UCI is distributed across multiple layers (e.g., layers 0 and 1) rather than concentrated in a single layer, enabling efficient transmission of increased control information volume without proportionally increasing the time or frequency resources required.
Solution Approach 2:
The patent segments the UCI transmission by dividing control information into different types (ACK/NACK, CQI, PMI, RI) and distributing them across multiple transport blocks and layers. This segmentation allows flexible allocation of control information across available resources, optimizing the transmission of large volumes of UCI in carrier aggregation scenarios.
2Productivity
If multiple layers transmission is used to transmit UCI, then the transmission efficiency is improved, but the complexity of determining transport blocks and mapping UCI increases
Solution Approach 1:
The patent employs preliminary action by pre-configuring the relationship between transport blocks and layers through higher-layer signaling (RRC configuration). The network pre-determines which layers should carry UCI and how transport blocks are mapped to layers, eliminating the need for complex real-time decisions at the UE. This configuration approach simplifies the UE's processing while maintaining high transmission efficiency.
Solution Approach 2:
The patent utilizes feedback mechanisms where the network provides Downlink Control Information (DCI) that includes layer indication information, guiding the UE on how to map UCI to specific layers. This feedback loop allows dynamic adaptation to channel conditions while maintaining a manageable complexity level through standardized procedures.
3Reliability
If UCI is transmitted only on PUSCH without data transmission, then the reliability of UCI transmission is improved, but the resource utilization efficiency decreases
Solution Approach 1:
The patent merges UCI transmission with data transmission by multiplexing control information onto the PUSCH that carries user data. This combining approach allows simultaneous transmission of both data and UCI, improving resource utilization efficiency while maintaining reliability through the robustness of PUSCH transmission and optional retransmission mechanisms.
Solution Approach 2:
The patent makes the PUSCH multi-functional by enabling it to carry both user data and UCI. The same physical channel serves dual purposes: data communication and control information transmission. This universality improves overall system efficiency by eliminating dedicated UCI channels while maintaining the reliability benefits of controlled transmission environments.
Data Source
AI summary
Provided are a method for transmitting uplink control information of a terminal in a wireless communication system and a terminal device using the method. The method comprises: determining the number of transmission blocks to be transmitted via a PUSCH supporting multiple-layer transmission; according to the determined number of transmission blocks, determining UCI to be included in each transmission block; and transmitting each transmission block comprising the UCI to a base station.