Guard Band Resource Allocation in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, the allocation of resources within a guard band is inefficient due to misalignment of Resource Block Groups (RBGs) or Precoding Resource Block Groups (PRGs) with the guard band boundaries, leading to interference and inaccurate channel estimation.
Innovation Solution
The proposed solution involves truncating or modifying PRGs/RBGs based on guard band boundaries, allowing reception and channel estimation only within the Downlink (DL) subband, and excluding the guard band for data channel reception, with Demodulation Reference Signals (DMRS) transmitted within the guard band for channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RBGs or PRGs are allocated without considering guard band boundaries, then resource allocation is simpler and more continuous, but interference increases and channel estimation accuracy deteriorates
Solution Approach 1:
The patent segments the frequency spectrum into DL subband and UL subband separated by guard bands. RBGs or PRGs are allocated only within the DL subband, excluding guard band regions. This segmentation prevents interference between DL and UL transmissions while maintaining accurate channel estimation by ensuring resource blocks are properly aligned with spectral boundaries.
2Reliability
If guard band is excluded from data channel reception, then interference is reduced, but resource utilization efficiency decreases
Solution Approach 1:
The patent extracts and excludes the guard band region from data channel allocation. By taking out the guard band (which spans PRBs 6-11 in the example) from the allocatable resource pool, the system prevents DL data from being scheduled in interference-prone regions, thereby improving reliability while the overall resource allocation efficiency is maintained through proper utilization of the remaining DL subband resources.
3Measurement precision
If DMRS are transmitted within guard band, then channel estimation is improved, but spectral efficiency decreases
Solution Approach 1:
The patent uses DMRS (Demodulation Reference Signals) transmitted within the guard band region as an intermediary for channel estimation. These reference signals occupy specific resource elements within the guard band PRBs, enabling the UE to estimate the channel response for DL subband data reception. While this uses some guard band resources, it significantly improves channel estimation accuracy which enhances overall system performance.
Data Source
AI summary
Methods, systems, and apparatuses are provided for resource allocation within a guard band in a wireless communication system comprising receiving, from a base station, a Downlink Control Information (DCI) indicating the UE to receive a Physical Downlink Shared Channel (PDSCH), wherein the DCI indicates a Resource Block Group (RBG) is allocated to the UE, and wherein at least one or more first Physical Resource Blocks (PRBs) of the RBG are within a Downlink (DL) subband and at least one or more second PRBs of the RBG are outside the DL subband, receiving PDSCH on the one or more first PRBs, and not receiving PDSCH on the one or more second PRBs.