Wireless Uplink Scheduling via Interference-Aware Time Slot Segmentation
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Solution Overview
Problem
In wireless communication networks, the implementation of time division channel access schemes leads to reduced coverage and throughput at cell edges due to power limitations, and frequency division schemes result in unused frequency resources, affecting uplink and downlink transmission efficiency.
Innovation Solution
A system and method that determines separate scheduling schemes for access nodes based on uplink scheduling requests and interference indicators, ensuring non-overlapping uplink portions to optimize resource allocation and minimize interference for wireless devices at the cell edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If time division channel access scheme is implemented, then frequency resources are fully utilized, but coverage and throughput at cell edge are reduced due to power limitations
Solution Approach 1:
The patent segments the channel access into different time slots with distinct uplink and downlink portions, allowing frequency division multiplexing within each time slot. This segmentation enables simultaneous uplink and downlink transmissions on different frequencies without interference, resolving the contradiction between resource utilization and cell edge performance.
Solution Approach 2:
The patent introduces a temporal dimension to frequency division by creating time slots that contain both uplink and downlink portions. This dimensional approach allows the system to achieve frequency division benefits while maintaining time division's ability to serve cell edge devices, as each time slot provides dedicated uplink resources for edge devices.
2Speed
If frequency division scheme is implemented, then bandwidth is doubled compared to time division, but frequency resources remain unused for uplink transmissions
Solution Approach 1:
The patent segments each time slot into distinct uplink and downlink portions, enabling frequency division multiplexing within the time domain. This allows the system to achieve doubled bandwidth capability while fully utilizing frequency resources for both uplink and downlink transmissions, eliminating resource waste.
Solution Approach 2:
The patent implements dynamic resource allocation where the access node can adaptively assign different frequency resources to different time slots based on transmission direction requirements. This dynamic approach ensures optimal resource utilization by allocating uplink frequencies during uplink portions and downlink frequencies during downlink portions of each time slot.
3Productivity
If uplink transmissions are scheduled continuously, then throughput is improved, but interference between adjacent access nodes increases
Solution Approach 1:
The patent segments the uplink transmission schedule into discrete time slots with dedicated uplink portions, preventing simultaneous uplink transmissions from adjacent access nodes. This segmentation maintains continuous uplink opportunity for each node while eliminating interfering transmissions, as nodes in different cells transmit in different time slots.
Solution Approach 2:
The patent implements feedback mechanisms where access nodes receive interference indicators from neighboring nodes and adjust their scheduling accordingly. This feedback loop allows the system to optimize throughput by adapting uplink scheduling based on real-time interference conditions, balancing productivity with interference management.
Data Source
AI summary
A system and method of scheduling communication in a wireless communication network are provided. A first access node can receive an uplink scheduling request from a wireless device. The first access node can receive a first interference indicator from a second access node when the wireless device is located at the cell edge. A first scheduling scheme for the first access node and a second scheduling scheme for the second access node can be determined based on the uplink scheduling request and the interference indicator. The uplink portions of the first scheduling scheme do not overlap the uplink portions of the second scheduling scheme. The first access node can instruct the wireless device to communicate uplink data to the first access node during the uplink portions of the first scheduling scheme and to communicate uplink data to the second access node during the uplink portions of the second scheduling scheme.