Dynamic Search Space Subband Switching for Traffic Peaks
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Solution Overview
Problem
Existing LTE systems restrict the scheduler's ability to offload subbands during traffic peaks and fail to effectively manage interference due to fixed subband configurations for search spaces, limiting the flexibility in channel allocation.
Innovation Solution
Implementing variable subband configurations by switching between different frequency ranges for search spaces, allowing dynamic adaptation of subband configurations through semi-static or dynamic signaling, and enabling frequency shifts to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed subband configurations are used for search spaces, then system simplicity is maintained, but the scheduler's ability to offload subbands during traffic peaks is restricted
Solution Approach 1:
The patent implements dynamic subband configuration where search spaces can be shifted to different frequency subbands based on traffic conditions. The base station can dynamically adjust which subbands are used for control channels, allowing the system to adapt to varying traffic loads while maintaining manageable complexity through standardized procedures.
Solution Approach 2:
The invention changes the frequency domain parameters of search spaces dynamically. By adjusting the subband configuration parameters (such as subband offset, bandwidth, and position) based on traffic conditions, the system achieves flexibility without requiring complete redesign of the control channel structure.
2Object-affected harmful factors
If fixed subband configurations are used for search spaces, then implementation simplicity is maintained, but the ability to reduce interference is restricted
Solution Approach 1:
The patent applies local quality by allowing different UEs or UE groups to use different subband configurations for their search spaces. This enables interference reduction by spatially separating control channels of different UEs in the frequency domain, while each UE still experiences a relatively simple configuration from its perspective.
Solution Approach 2:
The subband configuration is made dynamic, allowing the base station to adjust which frequency subbands are assigned to different UEs' search spaces based on interference conditions. This dynamic adjustment enables interference mitigation while managing complexity through centralized control.
3Productivity
If all search spaces are contained in a constant set of subbands, then UE decoding complexity is reduced, but channel allocation efficiency is limited
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands and assigns different search spaces to different subbands dynamically. This segmentation allows more efficient channel allocation by distributing control channels across available spectrum resources, while each UE still decodes a manageable number of candidates within its assigned subband.
Solution Approach 2:
The invention creates a universal framework where the same search space structure can be flexibly mapped to different subband configurations. This allows the system to achieve efficient channel allocation through subband switching while maintaining consistent decoding procedures for UEs.
Data Source
AI summary
Radio communication systems, devices and methods for enabling variable subband configuration of one or more search spaces. In a first time interval, a UE attempts to decode one or more control channels on downlink or sidelink resources of a first sub band configuration. In a second time interval, the UE attempts to decode one or more control channels on downlink or sidelink resources of a second sub band configuration. The first subband configuration spans a first frequency range and the second subband configuration spans a second frequency range different from the first frequency range.