Downlink Carrier Bandwidth Configuration for Spectrum Utilization
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Solution Overview
Problem
Current wireless communication systems face challenges in maximizing the use of allocated frequency spectrum, particularly in downlink (DL) carrier bandwidth, with limited attention given to packing spectrum within operator allocations.
Innovation Solution
The method involves configuring multiple DL carriers with constrained bandwidth within allocated frequency spectrum, allowing for flexible positioning and overlap, and signaling uplink carriers with independent offsets to UE, enabling more efficient spectrum usage and traffic pattern matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional downlink carrier bandwidth allocation is used, then system simplicity is maintained, but spectrum utilization efficiency is insufficient
Solution Approach 1:
The patent segments the downlink carrier into multiple sub-carriers with different bandwidths (e.g., first downlink carrier with first bandwidth, second downlink carrier with second bandwidth). This allows flexible packing of spectrum resources within the allocated frequency spectrum, improving utilization efficiency while maintaining manageable complexity through standardized segmentation approaches.
Solution Approach 2:
The patent implements dynamic bandwidth allocation where the radio network subsystem can configure different bandwidths for different downlink carriers based on traffic patterns and spectrum availability. The system dynamically adjusts the total occupied bandwidth to match actual needs, transitioning from static to dynamic allocation to optimize spectrum usage.
2Adaptability or versatility
If fixed symmetric DL and UL carrier allocation is used, then implementation simplicity is maintained, but adaptability to traffic patterns is limited
Solution Approach 1:
The patent introduces asymmetric carrier allocation where uplink carriers can have different bandwidths and frequency offsets relative to downlink carriers. The uplink carrier bandwidth is independently configured and can differ from the downlink carrier bandwidth, allowing the system to adapt to asymmetric traffic patterns while maintaining manageable configuration through standardized asymmetric parameters.
Solution Approach 2:
The patent applies local quality by allowing different bandwidth and offset configurations for different uplink carriers relative to their corresponding downlink carriers. Each uplink carrier can have customized local parameters (bandwidth, offset) optimized for its specific traffic characteristics, while the overall system maintains coherence through centralized configuration.
3Productivity
If multiple downlink carriers are packed into allocated spectrum, then spectrum usage is maximized, but frequency planning complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the radio network subsystem receives feedback about spectrum usage and traffic conditions, then adjusts the carrier configuration accordingly. This feedback loop enables the system to optimize spectrum packing density while maintaining coordination through continuous monitoring and adjustment based on actual network conditions.
Data Source
AI summary
Techniques of frequency spectrum usage in a wireless communication system include configuring two or more downlink carriers, each having a downlink carrier center frequency, to have a total occupied bandwidth that is constrained within an allocated downlink frequency spectrum. Further, the techniques include transmitting, to a user equipment (UE), two or more downlink carrier center frequency indicators that each identify a downlink carrier center frequency of each of the two or more downlink carriers. Also, the present techniques may include transmitting, to the UE, at least one uplink carrier center frequency indicator that at least relatively identifies at least one uplink carrier center frequency of at least one uplink carrier that is configured to have an independent, variable offset relative to one or more of the more than two downlink carriers. As such, these aspects allow new ways of squeezing carriers into the downlink while not impacting UE transmitter complexity.