Uplink Data Rate Optimization via Virtual MIMO and SIC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current multiple antenna technologies primarily enhance downlink communications in cellular networks, leaving a need for similar improvements in uplink communications, particularly for applications like video telephony and file transfer, where mobile stations typically use a single antenna and face limitations in diversity gain due to correlated channels.
Innovation Solution
Implementing Selective Per-Antenna Rate Control (S-PARC) for uplink transmissions by treating multiple mobile stations as a virtual single transmitter, optimizing transmission resources such as power, time, and frequency to maximize combined uplink data rates while minimizing self-interference, and using Successive Interference Cancellation (SIC) to enhance data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple mobile stations transmit simultaneously on the uplink, then the total uplink data rate increases, but the interference between transmissions increases
Solution Approach 1:
The patent segments the uplink transmission by treating each mobile station as a separate transmit antenna with its own data stream. The base station receives and processes these segmented streams independently through SIC, allowing simultaneous transmissions while managing interference through systematic separation and sequential cancellation of each segment's contribution to the total received signal.
Solution Approach 2:
The patent converts the harmful interference between simultaneous uplink transmissions into a beneficial signal structure. By treating interference as additional known signal components that can be measured and subtracted, the system transforms what was previously a limiting factor into a manageable element that enables higher overall data rates through controlled simultaneous access.
2Device complexity
If mobile stations use single antenna transmission, then device complexity is reduced, but diversity gain and data rates are limited
Solution Approach 1:
The patent merges multiple mobile stations into a virtual MIMO system where each mobile station's single antenna transmission is combined at the base station receiver. By treating the collection of single-antenna mobile stations as a distributed multiple-transmit-antenna system, the base station achieves MIMO-like diversity and capacity gains without requiring complex multiple antennas at each mobile device.
Solution Approach 2:
The patent creates a universal uplink transmission framework where single-antenna mobile stations can participate in enhanced data rate services without modification. The base station's SIC capability provides universal interference management for all simultaneous uplink transmissions, enabling legacy single-antenna devices to benefit from advanced MIMO techniques through network-side processing rather than device-side complexity.
3Productivity
If Successive Interference Cancellation is implemented, then uplink capacity increases, but receiver complexity increases
Solution Approach 1:
The patent positions the base station as an intermediary that performs the complex SIC processing between the simple mobile station transmitters and the network core. Mobile stations maintain simple transmit and receive functionality, while the base station acts as an intelligent mediator that sequentially cancels interference from detected signals, enabling high capacity without distributing complexity to resource-constrained mobile devices.
Data Source
AI summary
A base station maximizes an uplink data transmission rate from multiple mobiles treated by the base station as a virtual single uplink transmitter. The base station identifies a set of mobile stations as a candidate transmitting set and determines a transmit power allowable from the mobile stations in the candidate transmitting set. A subset of those mobile stations in the candidate transmitting set is identified. Uplink data transmission rates are assigned and communicated to the subset of mobile stations in the candidate transmitting set so as to optimize a total number of bits processed by the base station associated with the uplink transmissions received from the subset of candidate mobile stations. The optimization may accomplish one or more objectives in addition to optimizing the total number of bits processed.