Downlink Control Information Transmission via Frequency Diversity
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Solution Overview
Problem
In wireless communication, the consecutive distribution of subcarriers carrying downlink control information in the frequency domain prevents the realization of frequency diversity gain, which is essential for reliable and efficient data transmission.
Innovation Solution
The method involves dividing target resources into non-overlapping resource subsets in the frequency domain, selecting control channel bearing resource units from each subset, and ensuring they are inconsecutive in frequency, allowing for the transmission of downlink control information across these units to achieve a frequency diversity gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If subcarriers carrying downlink control information are distributed consecutively in frequency domain, then resource allocation is simple, but frequency diversity gain cannot be ensured
Solution Approach 1:
The patent divides the frequency domain resources into multiple non-overlapping resource subsets. Control channel bearing resource units are selected from different subsets, ensuring they are not consecutive in frequency domain. This segmentation approach maintains resource allocation simplicity while achieving frequency diversity gain by distributing control information across separated frequency resources.
2Reliability
If subcarriers carrying downlink control information are distributed inconsecutive in frequency domain, then frequency diversity gain is ensured, but resource allocation complexity increases
Solution Approach 1:
By pre-dividing frequency domain into structured resource subsets and defining clear selection rules (selecting from different subsets), the patent achieves inconsecutive frequency distribution for diversity gain while keeping allocation manageable through the subset framework.
Solution Approach 2:
The patent changes the frequency domain distribution parameter from consecutive to inconsecutive by selecting resource units from different non-overlapping subsets, thereby achieving frequency diversity while maintaining allocation efficiency through the subset structure.
3Reliability
If terminal device receives downlink control information on wider frequency domain width, then coverage is improved, but power consumption increases
Solution Approach 1:
The patent extracts and utilizes frequency diversity gain from inconsecutive resource distribution, which improves coverage through diversity while allowing terminal devices to operate on narrower frequency domain width, thereby reducing power consumption compared to wide continuous frequency allocation.
Data Source
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AI summary
This application provides a downlink control information transmission method and apparatus, where the method includes: dividing target resources into M resource subsets, where at least a part of at least two resource subsets in the M resource subsets do not overlap in frequency domain, and each resource subset includes at least one control channel bearing resource unit, where M is an integer, and M ≥ 2; determining a first resource set based on the M resource subsets, where the first resource set includes N control channel bearing resource units, at least two of the N control channel bearing resource units belong to different resource subsets, and at least two of the N control channel bearing resource units are inconsecutive in frequency domain, where N ≥ 2; and sending first downlink control information to a terminal device on the first resource set. Downlink control information is sent on N control channel bearing resource units that are inconsecutive in frequency domain, so that a frequency diversity gain is ensured.