Uplink Transmission Scheduling for Inter-eNB Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In inter-duplex inter-eNB carrier aggregation systems, the slow cooperation between eNBs leads to intermodulation interference when User Equipment (UE) transmits uplink signals to eNBs operating on different frequency bands, causing interference and limiting data transmission rates.
Innovation Solution
The method involves the UE receiving information on distinct resources for uplink channel scheduling from multiple eNBs and transmitting uplink channels on non-overlapping subframes, ensuring that uplink signals are sent on separate time frames for each eNB to prevent intermodulation interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits uplink signals to multiple eNBs operating on different frequency bands simultaneously, then the data transmission rate is improved, but intermodulation interference occurs between the eNBs
Solution Approach 1:
The patent segments the uplink transmission time by dividing subframes into different groups (first group for FDD eNB, second group for TDD eNB) and assigns non-overlapping time resources to each eNB. This temporal segmentation eliminates simultaneous transmissions on different frequency bands, thereby preventing intermodulation interference while maintaining multi-eNB connectivity
Solution Approach 2:
The patent dynamically adjusts the uplink transmission schedule based on the duplex configuration of each eNB. The UE adapts its transmission timing to match the dynamic requirements of FDD and TDD eNBs, ensuring that transmissions to different eNBs occur in non-overlapping time slots, thus avoiding interference while optimizing data transmission
2Adaptability or versatility
If the eNBs operate on different frequency bands with different duplex configurations, then the system capacity is improved, but the UE experiences intermodulation problems during uplink transmission
Solution Approach 1:
The patent segments the transmission resources by creating distinct time slots for different duplex configurations. FDD eNB receives uplink signals in first subframes while TDD eNB receives in second subframes, ensuring that the UE does not transmit to multiple eNBs simultaneously on different frequency bands, thereby maintaining reliable transmissions across diverse duplex configurations
Solution Approach 2:
The patent changes the temporal parameter of uplink transmissions by adjusting the subframe allocation and timing offsets based on the duplex configuration of each eNB. This parameter adjustment ensures that transmissions are scheduled in non-overlapping time resources, maintaining reliability when operating on different frequency bands with different duplex modes
Data Source
AI summary
A method and apparatus are provided for transmitting uplink signals including feedback for use in scheduling at different evolved Node Bs (eNBs) without intermodulation interference, especially in cases where the User Equipment (UE) is connected to an inter-duplex inter-eNB system in which the cooperation between eNBs is very slow or non-existent.