Uplink Downlink Scheduler Interaction for UE Self-Interference
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Solution Overview
Problem
In LTE systems, UE self-interference and UE-to-UE interference occur due to the overlap of uplink and downlink frequency bands, leading to sensitivity degradation and interference with adjacent technologies like MediaFlo, with conventional methods either limiting UE power or accepting sensitivity reduction.
Innovation Solution
The implementation of an uplink/downlink scheduler interaction mechanism that predicts and mitigates spurious emissions by adjusting resource block allocations and transmit power, using allocation tables to set boundaries and minimize interference, particularly in tight coexistence cases and adjacent channel scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional techniques (large duplex gaps, large guard bands, high quality filters) are used to avoid UE self-interference, then interference is reduced, but device complexity and spectrum efficiency deteriorate
Solution Approach 1:
The patent changes the parameter of resource block allocation patterns dynamically based on the detected interference conditions. Instead of using fixed large guard bands or high-quality filters, the system adjusts which resource blocks are allocated to uplink and downlink transmissions in real-time, adapting to varying interference scenarios while maintaining spectral efficiency.
Solution Approach 2:
The patent implements dynamic resource block allocation that adapts to changing interference conditions. The base station continuously monitors UE self-interference levels and adjusts the uplink/downlink resource block assignments dynamically, rather than using static guard bands or fixed filter configurations.
2Object-affected harmful factors
If UE power is limited to reduce self-interference, then interference is reduced, but transmission power and signal quality deteriorate
Solution Approach 1:
The patent applies local quality by allowing different power levels and allocation patterns for different resource blocks based on their specific interference characteristics. Instead of uniformly limiting power across all transmissions, the system identifies specific resource blocks where interference occurs and adjusts allocations locally in those regions while maintaining full power in interference-free regions.
3Measurement precision
If downlink power is increased to compensate for reduced sensitivity, then sensitivity is maintained, but power consumption and interference to adjacent channels increase
Solution Approach 1:
The patent performs preliminary action by detecting and characterizing interference patterns before they severely impact downlink reception. The base station proactively identifies resource blocks susceptible to UE self-interference and pre-adjusts the resource block allocation to avoid these problematic frequencies, preventing sensitivity degradation before it occurs and eliminating the need for compensatory power increases.
4Object-generated harmful factors
If resource block allocation is optimized to reduce emissions, then interference is reduced, but spectrum utilization and data rate deteriorate
Solution Approach 1:
The patent dynamically changes resource block allocation parameters based on real-time interference measurements. The system identifies which resource blocks generate excessive emissions and adjusts the allocation pattern to avoid those specific blocks, thereby reducing emissions without unnecessarily limiting overall spectrum utilization through fixed conservative allocations.
Data Source
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AI summary
It is provided an apparatus, comprising scheduling means configured to allocate one or more resource blocks to a channel in an uplink frequency band and/or a downlink frequency band according to a first telecommunication standard and the available frequency band for the uplink or downlink, respectively, wherein the scheduling means is additionally configured to take into account a limit of resource blocks to be allocated to the channel, and wherein the limit is at least one of an allowed resource block, a resource block to be avoided, a width of a range of allowed resource blocks, a non-usage information of the channel, an upper allowed resource block, and a lower allowed resource block, an upper limit of the number of resource blocks, a lower limit of the number of resource blocks, and any reasonable combinations of the limits mentioned.