Uplink Control Data Multiplexing in Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in SC-FDMA, simultaneous transmission of data and control information within the same transmission interval is challenging due to the fixed transport format of control channels, which reduces data rates and increases Peak to Average Ratio (PAPR), limiting efficient resource utilization.
Innovation Solution
The method involves dynamically controlling the resources of the control channel based on the data rate of the UE, using the same modulation scheme as the data channel, and calculating the necessary number of modulation symbols for control information transmission, allowing flexible allocation and multiplexing of data and control channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information is transmitted through a separate frequency resource allocated for control channel, then control information transmission is ensured, but data transmission is blocked and resource utilization is reduced
Solution Approach 1:
The patent merges the control channel and data channel transmissions by allowing control information to be multiplexed with data on the same frequency resources. The control information is inserted into data symbols at specific positions, enabling simultaneous transmission of both control and data without requiring separate frequency resources, thus resolving the contradiction between control reliability and data productivity
Solution Approach 2:
The patent makes the frequency resources universal by enabling them to serve dual purposes: carrying both data information and control information. The same frequency resource block can function as a data channel in some time intervals and as a combined data-control channel in other intervals, eliminating the need for dedicated control frequency resources and improving overall resource utilization
2Productivity
If control information is multiplexed with data through frequency resource of data channel, then resource utilization improves, but Peak to Average Ratio (PAPR) increases due to violation of single carrier characteristic
Solution Approach 1:
The patent applies local quality by inserting control information at specific local positions within the data symbol sequence rather than uniformly distributing it. Control information is placed at predetermined symbol positions (e.g., every Nth symbol) while maintaining the single carrier property in other regions, thus locally accommodating control information without globally increasing PAPR
Solution Approach 2:
The patent uses data symbols as an intermediary carrier for control information. Instead of directly transmitting control information as separate modulated symbols that would increase PAPR, the control bits are embedded within the data symbol structure, using the data transmission framework as a mediator to convey control information while maintaining low PAPR characteristics
3Ease of operation
If fixed transport format is used for control channel, then control channel transmission is simplified, but data rate is reduced due to reserved resources
Solution Approach 1:
The patent introduces dynamics by making the control channel format adaptable rather than fixed. The amount of resources allocated to control information varies dynamically based on the actual control information size and channel conditions. The transport format can be adjusted between different modes (e.g., full resource allocation for control, or reduced allocation when control information is small), enabling flexible resource utilization that maintains simplicity while improving data rate
Data Source
AI summary
Disclosed is a method and an apparatus for multiplexing and transmitting data and uplink control information, and receiving the data and control information in a wireless communication system. In the system multiplexing an uplink packet data channel and a control channel, a transport format of the control channel for transmission of the control information is changed according to the transport format of the data channel. The disclosed method and apparatus can control the quantity of resources for the control channel in the case of transmitting high speed data, and thus can the efficiency of the data channel resources.