Uplink Control Information Multiplexing in TDD Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting control information, particularly in time division duplex (TDD) systems, where managing uplink control information and optimizing resource allocation are challenging.
Innovation Solution
The proposed solution involves a method for efficiently transmitting uplink control information in TDD systems by multiplexing control information with UL-SCH data into a PUSCH, using techniques such as channel interleaving and specific resource allocation strategies, allowing for effective ACK/NACK transmission across multiple DL subframes in a single UL subframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information is transmitted separately from data in TDD systems, then reliability of control information is maintained, but resource utilization efficiency deteriorates and system complexity increases
Solution Approach 1:
The patent merges control information (HARQ-ACK) with uplink data transmission by multiplexing them on the same PUSCH resources. This combining approach allows control information to be transmitted alongside data in the uplink subframe, improving resource utilization while maintaining reliability through the same transmission channel.
Solution Approach 2:
The PUSCH is designed to serve multiple functions simultaneously - it can transmit both uplink data and control information (HARQ-ACK) in the same time-frequency resources. This multi-functionality eliminates the need for separate dedicated control channels in certain scenarios, optimizing resource efficiency in TDD systems.
2Loss of information
If multiple ACK/NACK bits are transmitted in a single UL subframe, then feedback completeness is improved, but transmission complexity and error probability increase
Solution Approach 1:
The patent segments the multiple ACK/NACK bits corresponding to different downlink subframes and distributes them across available uplink resources. By dividing the feedback information into manageable units that can be multiplexed with data, the system maintains complete feedback while reducing the complexity of handling large blocks of control information.
Solution Approach 2:
The patent transitions from transmitting control information in a separate dedicated dimension (control channel) to multiplexing it within the data transmission dimension (PUSCH). This dimensional change allows multiple ACK/NACK bits to be conveyed efficiently alongside data, reducing transmission complexity while maintaining feedback completeness.
3Ease of operation
If separate resources are allocated for control information, then resource management is simplified, but overall system capacity deteriorates
Solution Approach 1:
The patent combines control information and data transmission into the same resource pool (PUSCH), eliminating the need for separate dedicated control resources. This merging increases the effective system capacity by utilizing existing uplink data resources for dual purposes, while resource management remains tractable through standard multiplexing procedures.
Solution Approach 2:
The patent changes the allocation parameters by allowing dynamic sharing of PUSCH resources between data and control information based on traffic conditions. Instead of fixed separate allocations, the system adjusts the proportion of resources used for control versus data, optimizing overall capacity while maintaining manageable resource control through parameter-based management.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and an apparatus for transmitting uplink control information in the wireless communication system, which supports carrier aggregation and operates by a TDD, and comprises the steps of: deciding HARQ-ACK bit numbers for each cell from a plurality of cells; composing a HARQ-ACK payload comprising HARQ-ACK bit(s) for each of the plurality of cells; and transmitting the HARQ-ACK payload from a subframe n through a PUSCH.