In-Device Coexistence Interference Avoidance via Resource Block Allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In-device coexistence interference between LTE and co-located radio technologies such as ISM or GNSS in user equipment (UE) leads to performance degradation, as current filter technologies are insufficient to mitigate adjacent channel interference effectively.
Innovation Solution
Implementing resource block request and allocation procedures within the UE and network to coordinate LTE and other radio technologies, allowing the UE to identify and report interference to the eNB, which then determines a frequency or time division multiplexing solution to minimize interference, and specifying optimal resource block allocations to reduce interference to co-located devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filter technology is used to mitigate adjacent channel interference, then interference reduction is achieved, but current filter technologies are insufficient to effectively mitigate interference
Solution Approach 1:
The patent changes the approach from passive filter-based interference mitigation to active parameter control by dynamically adjusting resource block allocation, uplink power control, and time/frequency resource scheduling based on detected interference conditions, achieving effective interference reduction where filters failed
2Object-affected harmful factors
If resource block allocation is optimized to reduce interference, then co-located device performance is improved, but LTE throughput may be reduced due to restricted resource usage
Solution Approach 1:
The patent implements dynamic resource block allocation where the set of available RBs is adjusted in real-time based on interference detection results and network conditions, allowing the system to optimize between interference reduction and throughput maintenance rather than using fixed restrictive allocations
Solution Approach 2:
The patent applies partial interference mitigation by targeting only the specific resource blocks causing interference to co-located devices, rather than restricting all LTE resources, thus maintaining overall system throughput while resolving specific interference issues
3Object-affected harmful factors
If uplink power control is adjusted to mitigate interference, then interference to WLAN is reduced, but LTE uplink performance may deteriorate due to power limitations
Solution Approach 1:
The patent applies local power control adjustments specifically to the resource blocks causing interference to WLAN, rather than uniformly reducing power across all uplink transmissions, thus maintaining LTE uplink performance in non-interfering frequency regions while mitigating WLAN interference
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
A method is provided for reducing radio frequency interference between a first device and a second device co-located on a UE. The method comprises transmitting, by the UE, to a network element, responsive to the UE detecting IDC interference between the first device and the second device, an output power level of the first device, an amount of de-sense experienced by the second device, and information regarding a plurality of RBs on which the UE requests to perform an uplink transmission.