Low-Latency Wireless Resource Allocation with Reduced Inter-Cell Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in managing resources to achieve low latency transmissions with reduced interference, particularly in scenarios involving shortened transmission time intervals (sTTIs), which are sensitive to interference and require enhanced reliability.
Innovation Solution
A method where base stations configure two or more sets of resources with different power parameters, including frequency and time resources, to minimize inter-cell interference, with neighboring base stations coordinating to ensure reduced power transmissions for certain sets of resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations transmit using high power to improve signal strength and coverage, then transmission coverage is improved, but inter-cell interference increases which degrades reliability of low latency transmissions
Solution Approach 1:
The patent applies local quality by configuring different power parameters for different resource sets. Specifically, power-restricted resources are assigned with reduced power parameters compared to non-power-restricted resources, creating localized power reduction in specific time-frequency regions where low latency transmissions occur, thereby reducing inter-cell interference precisely where needed without compromising overall system coverage
Solution Approach 2:
The patent implements parameter changes by introducing power parameters as a controllable variable that can be adjusted independently for different resource sets. The base station configures power-restricted resources with specific power parameters that are lower than those for non-restricted resources, dynamically changing the transmission power parameter to balance coverage and interference reduction
2Speed
If shortened TTI transmissions are used to reduce latency, then transmission speed is improved, but sensitivity to interference increases which degrades reliability
Solution Approach 1:
The patent addresses this contradiction by applying local quality through selective power restriction on specific resource sets designated for low latency transmissions. By reducing power parameters only on power-restricted resources while maintaining normal power on non-restricted resources, the system preserves high transmission speed for time-sensitive data while locally mitigating interference effects that would otherwise degrade reliability
Solution Approach 2:
The patent converts the harmful effect of power restriction (reduced signal strength) into a benefit by coordinating with neighboring base stations to create protected resource regions. The power restriction on power-restricted resources, when coordinated across cells, transforms potential interference harm into a beneficial interference reduction that enhances reliability of short TTI transmissions in the protected frequency-time regions
3Reliability
If multiple base stations coordinate power parameters to reduce interference, then reliability of low latency transmissions is improved, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the resource space into distinct power-restricted and non-power-restricted resource sets, each with independently configured power parameters. This segmentation allows neighboring base stations to coordinate by agreeing on which specific resource sets should be power-restricted, breaking down the complex coordination problem into manageable segments that can be configured and managed independently
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Described techniques provide for low latency transmission time interval (TTI) transmissions that may have reduced likelihood of experiencing interference from one or more neighboring transmitters. A base station may configure two or more sets of resources for two or more sets of wireless transmissions, in which low latency transmissions may be transmitted in a set of wireless transmissions using all or a portion of one of the sets of resources. The set of resources available for the low latency transmissions may be associated with a set of power parameters that provide reduced transmission powers relative to one or more of the other sets of resources. The two or more sets of resources may include one or more sub-bands of available frequency resources, one or more subsets of time resources, or combinations thereof. In some cases, neighboring base stations may coordinate sets of resources that have reduced power parameters.