Frequency Indexing for D2D Discovery Signaling Overhead
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Solution Overview
Problem
Current wireless communication systems face challenges in device-to-device (D2D) discovery messaging, which incurs high signaling overhead and negatively impacts decoding performance due to the need for high coding rates.
Innovation Solution
The use of frequency indexing, specifically subcarrier indexing, to convey information during device-to-device wireless communications, reducing signaling overhead and improving decoding performance by allowing lower coding rates through message mapping techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discovery messaging is performed in conventional wireless systems, then device-to-device communication capability is provided, but signaling overhead increases and decoding performance deteriorates due to high coding rates
Solution Approach 1:
The patent extracts information from the message payload and conveys it through the selection of discovery resources (time-frequency slots, subcarriers, or cyclic shifts). By taking out information from the traditional message body and embedding it in resource selection, the signaling overhead is reduced and decoding performance is improved without losing any information
Solution Approach 2:
The patent introduces a new dimension for information conveyance by using the index of discovery resources (temporal, frequency, or cyclic shift dimensions) to carry message information. This transforms the problem from transmitting information in the message payload to encoding information in the resource selection space, thereby reducing overhead while maintaining full information transfer
2Loss of information
If high coding rates are used for discovery messaging, then signaling overhead is reduced, but decoding performance deteriorates
Solution Approach 1:
The patent extracts information from the message payload and conveys it through the selection of discovery resources (time-frequency slots, subcarriers, or cyclic shifts). By taking out information from the traditional message body and embedding it in resource selection, the signaling overhead is reduced and decoding performance is improved without losing any information
Solution Approach 2:
The patent introduces a new dimension for information conveyance by using the index of discovery resources (temporal, frequency, or cyclic shift dimensions) to carry message information. This transforms the problem from transmitting information in the message payload to encoding information in the resource selection space, thereby reducing overhead while maintaining full information transfer
Data Source
AI summary
This disclosure relates to techniques for supporting message mapping via time and/or frequency indexing. For example, these techniques may be applied to device-to-device wireless communication. For example, device to device discovery may use message mapping via frequency indexing. A portion of the payload of a message, such as a discovery message, may be offloaded to a frequency and/or time index. A receiving device may determine the offloaded portion of the payload based on the frequency and/or time (e.g., subcarrier and/or slot) used to transmit the message.