PRB Grid Alignment via Frequency Offset Indication
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Solution Overview
Problem
In wireless communication systems, the inconsistency between the center frequency of a synchronization signal (SS) and the carrier frequency leads to misinterpretation of resources, resulting in degraded communication quality due to incorrect determination of the physical resource block (PRB) grid.
Innovation Solution
A method where the network device indicates a frequency offset between the PRB grid corresponding to the SS and the PRB grid used for data/control channels, allowing the terminal to correctly determine the PRB grid for data/control information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the center frequency of the synchronization signal (SS) is inconsistent with the center frequency of the carrier, then the SS can be transmitted at a different frequency location, but the terminal cannot correctly determine the physical resource block (PRB) grid, leading to resource misinterpretation and degraded communication quality
Solution Approach 1:
The patent introduces an intermediary mechanism (frequency offset indication and PRB grid determination method) that bridges the gap between the SS center frequency and carrier center frequency. The network device indicates a frequency offset value that represents the relative location relationship between the SS and the carrier, enabling the terminal to correctly determine the PRB grid even when the SS is transmitted at a different frequency location than the carrier center. This intermediary offset information resolves the contradiction by providing the necessary reference frame for accurate resource interpretation.
2Ease of operation
If the terminal determines the PRB grid based on the SS center frequency, then the PRB grid determination is simplified, but resource misinterpretation occurs when the SS center frequency differs from the carrier center frequency
Solution Approach 1:
The patent changes the parameter used for PRB grid determination from solely relying on SS center frequency to using a combination of SS center frequency and indicated frequency offset. The network device provides offset indication information that modifies the basic PRB grid determination process, allowing the terminal to accurately locate the PRB grid relative to the carrier center frequency while maintaining the simplicity of SS-based initial detection. This parameter adjustment resolves the contradiction between operational simplicity and measurement precision.
Data Source
AI summary
Embodiments of this application provide a communication method, a communications apparatus, and a communications system, to determine a physical resource block (PRB) grid when a center frequency of a synchronization signal (SS) is inconsistent with a center frequency of a carrier. The method includes: receiving, by a terminal, an SS from a network device; determining, by the terminal, a first PRB grid based on the SS; receiving, by the terminal, first indication information from the network device, where the first indication information is used to indicate a first frequency offset between the first PRB grid and a second PRB grid; and determining, by the terminal, the second PRB grid based on the first PRB grid and the first frequency offset.