Full-Duplex Radio Interference Reduction via Dynamic UE Grouping
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Solution Overview
Problem
In wireless communication networks, especially LTE, simultaneous transmission and reception on the same carrier (Full-Duplex) are hindered by self-interference due to mobility of user equipment (UEs), leading to non-optimal grouping and increased interference between UEs belonging to different groups.
Innovation Solution
A method and apparatus that measure interferences between UEs using specific patterns to determine optimal grouping, scheduling uplink and downlink resources on a time-division basis, allowing only UEs from different groups to transmit simultaneously, and adjusting group assignments based on interference levels to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs are placed into fixed groups for Full-Duplex transmission, then simultaneous transmission and reception is enabled, but interference increases when UEs move closer due to mobility
Solution Approach 1:
The patent implements dynamic group management where UEs are not permanently assigned to fixed groups but are dynamically placed into appropriate groups based on real-time interference measurements. The eNB continuously monitors interference levels and reassigns UEs between groups as needed, transforming the static grouping approach into a dynamic adaptation mechanism that responds to changing spatial relationships and interference conditions.
Solution Approach 2:
The patent establishes a feedback loop where the eNB triggers UEs to measure interference from other groups, reports these measurements back to the eNB, and uses this feedback information to make informed decisions about group placement. This closed-loop control system allows the network to continuously optimize UE grouping based on actual interference conditions rather than relying on static assignments.
2Object-affected harmful factors
If interference measurement is performed continuously to optimize grouping, then interference reduction is achieved, but power consumption at UE increases
Solution Approach 1:
The patent implements periodic interference measurement triggered by the eNB rather than continuous measurement at the UE. The eNB decides when measurements are necessary and triggers them periodically or event-driven, allowing UEs to enter low-power states between measurements. This periodic approach balances the need for interference optimization with power conservation by performing measurements only when beneficial.
Solution Approach 2:
The patent leverages existing UE capabilities to perform interference measurements using already-available measurement resources and procedures. Rather than requiring dedicated measurement infrastructure or continuous active monitoring, the system uses the UE's existing measurement functionality in a triggered, on-demand manner, reducing the need for additional power-consuming measurement mechanisms.
3Productivity
If UEs are grouped to enable Full-Duplex transmission, then resource utilization improves, but self-interference cancellation becomes more difficult
Solution Approach 1:
The patent segments the network into multiple UE groups where Full-Duplex transmission is enabled within each group while Time-Division Duplexing is used between groups. This segmentation approach isolates self-interference issues to individual groups, making cancellation more manageable. By dividing the network into separate transmission domains, the system can apply FD technology selectively without requiring every UE to handle complex self-interference cancellation simultaneously.
Solution Approach 2:
The patent applies different transmission modes to different groups of UEs based on local conditions. Some groups are assigned Full-Duplex capability with advanced self-interference cancellation, while other groups use simpler Time-Division Duplexing. This local differentiation allows the system to optimize for Full-Duplex performance where needed while avoiding the complexity burden on UEs that don't require or support FD operation.
Data Source
AI summary
The present application relates generally to use of radio resources in a radio access network (RAN) and, in more specific, Full-Duplex (FD) transmission on the same carrier. Due to the mobility of the UEs or the non-optimal grouping, two UEs belonging to different groups may be close to each other while performing transmission and cause serious transmission interferences to 5 each other. This is one of the problems which a method in accordance with the invention aims to solve. When the performing the method a RAN triggers a UE to measure 601 first interferences originated from a first group of UEs. Then the RAN triggers the same UE to measure 602 second interferences originated from a second group of the UEs. Finally, the RAN places 603 the UE into the first group, if the first interferences are higher than the second interferences. The both 10 groups of the UEs are composed of such user equipments which share a group-specific transmission pattern. Uplink and downlink resources of the RAN are scheduled according to a time-division to the UEs, so that simultaneous transmissions are allowed only for such user equipments that belong to different groups. Advantages of the invention are the following: 1) simultaneous transmission and reception is supported in a RAN and in a UE which is either a FD 15 UE or a HD UE, 2) different kinds of interferences are efficiently reduced, and 3) the interferences are measured in a way that saves power.