Uplink Coordination Indicator for Wireless Interference
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Solution Overview
Problem
High-capacity wireless networks face channel interference issues due to directional beamforming, leading to hidden node, exposed node, and deafness problems, which are not effectively addressed by existing listen-before-talk protocols, particularly in new radio systems.
Innovation Solution
Implementing a coordination indicator for scheduled uplink transmission in wireless networks, allowing user equipment to transmit data only when granted permission and using notify-to-send and notify-not-to-send messages within a resource coordination zone to coordinate channel access and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If listen-before-talk protocol is used in high-capacity wireless networks with directional beamforming, then channel access coordination is provided, but hidden node, exposed node, and deafness problems occur due to directional transmission characteristics
Solution Approach 1:
The patent introduces a coordination indicator as an intermediary mechanism that mediates between transmitters and receivers. This indicator, transmitted in a resource coordination zone, provides explicit coordination information about directional transmissions, allowing nodes to make informed decisions about channel access without relying solely on traditional LBT listening mechanisms, thereby resolving hidden node and exposed node problems
Solution Approach 2:
The patent segments the communication resources by introducing a resource coordination zone separate from regular data transmission resources. This segmentation allows coordination indicators to be transmitted and processed independently, enabling fine-grained control over channel access decisions for different directional beams without interfering with normal data transmission
2Productivity
If directional beamforming is implemented to increase network throughput, then capacity is improved, but interference detection accuracy deteriorates due to directional transmission characteristics
Solution Approach 1:
The patent implements a feedback mechanism where receivers detect coordination indicators transmitted by other nodes and send back responses indicating their transmission intentions. This feedback loop allows the transmitting node to adjust its beamforming and timing based on actual channel conditions and potential interference, improving interference detection accuracy while maintaining high throughput
Solution Approach 2:
The patent performs preliminary actions by transmitting coordination indicators before actual data transmission occurs. These indicators provide advance notice of intended directional transmissions, allowing other nodes to prepare accordingly and avoid conflicts, thereby improving interference detection and prevention before the actual harmful interference occurs
3Productivity
If user equipment transmits data continuously to maximize throughput, then productivity increases, but channel interference increases due to simultaneous transmissions
Solution Approach 1:
The patent introduces dynamic control of transmission timing through coordination indicators. Instead of continuous transmission, UEs dynamically adjust their transmission timing based on real-time coordination information received from the base station and other UEs. This dynamic approach allows the system to maximize throughput by enabling simultaneous transmissions when no interference occurs while preventing interference when directional beams would conflict
Data Source
AI summary
Method and apparatus of a terminal device and a base station for scheduled uplink transmission are provided in this disclosure. In a terminal device, an uplink grant from a base station is detected providing permission of data transmission from the terminal device. A coordination indicator identifying a resource coordination zone is transmitted to the base station along with the data. Then, controlling messages are sent from the terminal device for a further uplink grant to be issued from the base station, based on monitoring the resource coordination zone. Problem arising from channel interference can be resolved through the provided methods.