Uplink Control Information Transmission in LTE PUSCH
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting uplink signals and control information, particularly in multiple access systems like LTE, where conventional methods struggle with resource allocation and channel status feedback in MIMO environments.
Innovation Solution
The proposed method involves a user equipment that receives downlink control information for PUSCH scheduling, including resource block allocation, channel status information request, and MCS information, and transmits channel status information only on the PUSCH without a transport block under specific conditions, such as a single enabled transport block with MCS index 29 and limited resource blocks, to efficiently manage uplink signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel status information is transmitted together with transport block data on PUSCH, then resource utilization is improved, but control information transmission reliability deteriorates
Solution Approach 1:
The patent segments the transmission by separating control information (channel status information) from data transmission (transport block). When control information is transmitted alone without transport block, the PUSCH carries only control information, ensuring its reliability. When transport block is present, both can be multiplexed together. This segmentation allows the system to prioritize control information reliability while maintaining resource utilization efficiency.
2Productivity
If multiple transport blocks are transmitted simultaneously, then data throughput is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic transport block management where the number of enabled transport blocks can be adjusted based on channel conditions and system requirements. The system can dynamically switch between transmitting one or two transport blocks, and can also dynamically switch between transmitting transport blocks with or without channel status information. This dynamic approach allows the system to optimize data throughput while managing device complexity adaptively rather than being fixed.
3Productivity
If channel status information is always transmitted with transport block, then resource utilization is improved, but ease of operation deteriorates
Solution Approach 1:
The patent applies partial action by selectively transmitting channel status information only when necessary (when transport block is present and resource allocation allows). Instead of always transmitting channel status information with every transport block, the system transmits it partially - only in conditions where it adds value and resources permit. This simplifies operation by avoiding unnecessary transmissions while still utilizing resources efficiently when needed.
Data Source
AI summary
An apparatus for transmitting an uplink signal and method thereof are disclosed, by which an uplink signal can be efficiently transmitted in a wireless communication system. The present invention includes receiving a downlink control information (DCI) used for PUSCH (physical uplink shared channel) scheduling, the DCI including an information for resource block allocation, an information for a channel status information request and a plurality of MCS (modulation and coding scheme) informations for a plurality of transport blocks and if a condition is met, transmitting a channel status information only on the PUSCH without a transport block for UL-SCH (uplink shared channel). Moreover, the condition includes a case that: only one transport block is enabled, the MCS information for the enabled transport block indicates an MCS index 29, the information for the channel status information request indicates 1, and the number of allocated resource blocks is equal to or smaller than 4.