Uplink Control Signal Design for Multi-Carrier Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, such as the IEEE 802.16m standard, face challenges in providing efficient performance improvements for advanced services and applications, particularly in managing channel conditions and supporting future advanced mobile networks with fluctuating channel conditions and diverse user requirements.
Innovation Solution
The implementation of an advanced air interface using OFDM modulation with multiple antennas, relay stations, and adaptive modulation and coding techniques to enhance channel quality feedback and resource management across multiple carriers, enabling efficient data transmission and handover operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptive modulation and coding techniques are implemented to enhance channel quality feedback, then network performance and reliability are improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent implements adaptive modulation and coding (AMC) that dynamically adjusts modulation schemes and coding rates based on real-time channel conditions. The system transitions between different modulation modes (QPSK, 16-QAM, 64-QAM) and coding rates according to channel quality feedback, enabling the communication system to adapt to varying channel conditions and maintain reliable transmission while optimizing performance.
Solution Approach 2:
The patent changes key transmission parameters including modulation order, coding rate, and resource allocation based on channel quality indicators. The base station receives channel quality feedback from user equipment and adjusts transmission parameters accordingly, changing the physical layer parameters to match channel conditions and achieve optimal reliability.
2Productivity
If multiple antennas and relay stations are deployed to support advanced services, then network capacity and coverage are improved, but system complexity and infrastructure requirements increase
Solution Approach 1:
The patent divides the network into multiple segments including base stations, relay stations, and user equipment, each performing specific functions. Relay stations are deployed to extend coverage and improve capacity by acting as intermediate nodes between base stations and user equipment, segmenting the network infrastructure to achieve better performance while managing complexity through functional division.
Solution Approach 2:
The patent implements a multi-functional system where base stations and relay stations can serve multiple purposes: providing data transmission, channel quality feedback, handover operations, and support for multiple services simultaneously. The OFDMA framework enables universal resource allocation across different services and users, allowing the infrastructure to handle diverse traffic types and requirements.
3Productivity
If resource allocation is optimized across multiple carriers, then data transmission efficiency is improved, but control signaling overhead and processing complexity increase
Solution Approach 1:
The patent employs multi-carrier OFDMA that distributes data transmission across multiple frequency carriers, adding a frequency dimension to resource allocation. This allows efficient utilization of spectral resources by allocating different carriers to different users or services, improving overall transmission efficiency while managing control overhead through carrier-specific resource allocation.
Solution Approach 2:
The system performs preliminary resource allocation and scheduling decisions based on predicted channel conditions and user requirements. The base station pre-allocates resources across multiple carriers before actual data transmission, reducing the need for frequent control signaling during data transmission and improving efficiency by preparing resource assignments in advance.
Data Source
AI summary
The present disclosure generally relates to an uplink control signal design for wireless system. One example method includes establishing communication with a mobile station in a multi-carrier wireless communication system using a primary carrier, providing a first control signaling via the primary carrier, the first control signaling assigning at least one secondary carrier, and receiving a channel quality indication of the secondary carrier via the primary carrier using a control channel.