Multi-User Uplink Coordination for Lower Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink transmissions from multiple user terminals, particularly in scenarios where not all terminals support advanced signaling techniques like SDMA, leading to inefficiencies in bandwidth utilization and increased traffic.
Innovation Solution
Implementing a multi-user MIMO (MU-MIMO) system with a clear-to-transmit (CTX) message mechanism that allows simultaneous uplink transmissions from multiple user terminals, optimizing transmission durations and reducing interference through coordinated spatial processing and feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user terminals transmit uplink data simultaneously using shared channel resources, then bandwidth utilization improves, but interference between terminals increases
Solution Approach 1:
The patent segments the uplink transmission resources by introducing orthogonal cover codes that divide the shared channel into orthogonal sub-channels. Each user terminal is assigned a unique orthogonal cover code, allowing simultaneous transmissions to be separated at the receiver, thus maintaining high bandwidth utilization while eliminating interference between users.
2Quantity of substance
If transmission opportunity duration is extended to accommodate more data, then data throughput increases, but time required for transmission increases
Solution Approach 1:
The patent changes the parameter of transmission opportunity duration dynamically based on channel conditions and data requirements. The access point determines optimal transmission durations for multiple terminals and coordinates their transmissions to complete within these optimized time windows, achieving high data throughput without excessive transmission time.
3Productivity
If coordinated spatial processing is implemented for multi-user MIMO, then system performance improves, but device complexity increases
Solution Approach 1:
The patent introduces the access point as an intermediary that performs the complex spatial processing and coordination functions. The access point receives data from multiple terminals, performs multi-user MIMO processing, and manages transmission opportunities. This centralizes the complexity at the access point while keeping terminal devices simple, thereby improving system performance without significantly increasing overall device complexity.
Data Source
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AI summary
Systems and methods are disclosed that may provide for selective multi-user uplink (UL) of data for wireless devices. For example, a first wireless device may request permission to initiate a UL transmission to a second wireless device. The first wireless device may then receive, from the second wireless device, permission to initiate the UL transmission according to a multi-user (MU) UL protocol, determine a threshold duration for the UL transmission, and transmit UL data to the second wireless device according to the MU UL protocol and the threshold duration.