Uplink Control Signaling Multiplexing in DFT-SOFDM Systems
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Solution Overview
Problem
In single carrier DFT-SOFDM communication systems, there is a need for a method to effectively multiplex user data non-associated control signaling with user data for transmission, as existing schemes struggle with different performance requirements and practicality, especially in scenarios like VoIP and synchronous H-ARQ.
Innovation Solution
The solution involves puncturing user data with Layer 1 and Layer 2 user data non-associated and user data-associated control signaling to produce a data stream that multiplexes control signaling and user data, allowing for transmission over the same frequency and time slots, preserving the single carrier property and reducing peak-to-average power ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control signaling is transmitted independently in reserved frequency regions, then control signaling reliability is improved, but device complexity and scheduling restrictions increase
Solution Approach 1:
The patent combines control signaling and user data transmission by multiplexing control symbols with data symbols in the same frequency resources. Instead of separating control and data into different frequency regions, the invention merges them into a unified transmission structure where control information is embedded within the data transmission resources, eliminating the need for separate reserved frequency regions and simplifying scheduling.
2Productivity
If control signaling is multiplexed with user data, then resource utilization is improved, but multiplexing difficulty increases due to different performance requirements
Solution Approach 1:
The patent segments control information and data information into separate symbol streams that are processed independently through their respective coding and modulation schemes. Control symbols are generated from control information bits through separate channel coding and modulation, while data symbols are generated from data bits through separate processing. These segmented symbol streams are then combined in the frequency domain without requiring complex time-domain multiplexing or joint coding schemes.
Solution Approach 2:
The invention changes the domain of multiplexing from time-domain or code-domain to frequency-domain. By transforming both control and data signals into the frequency domain and combining them there, the system accommodates different performance requirements through separate parameter optimization for each signal type while achieving simple resource sharing. The frequency-domain combination allows independent control of transmission parameters for control and data channels.
3Reliability
If scheduling is restricted to accommodate control signaling, then control signaling transmission is ensured, but productivity and flexibility decrease
Solution Approach 1:
The patent creates a universal transmission resource that can simultaneously carry both control signaling and user data. The same frequency resources allocated for data transmission serve dual purposes: carrying data symbols and embedding control symbols. This multi-functional resource allocation eliminates the need for separate dedicated control resources and removes scheduling restrictions, allowing flexible allocation of resources for both control and data transmissions within the same time-frequency block.
Data Source
AI summary
A user equipment (UE) operating in an Orthogonal Frequency Division Multiplexing communication system transmits Layer 1 and Layer 2 user data non-associated and user data associated control signaling on an uplink by puncturing user data information with the user data non-associated and user data associated control signaling to produce a data stream wherein the control signaling and user data information are multiplexed. The UE then conveys the punctured data stream to a radio access network via an air interface. The communication system further provides for a selection of a coding and modulation for the control signaling based on a modulation and coding scheme of the user data and a transmission scheme that is applied for transmission of the user data information over the air-interface.