Terminal Feedback Channels with Interlace for Unlicensed OCB Compliance
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Solution Overview
Problem
In newly-operated frequency bands with higher frequencies, the conventional PSFCH format of one PRB (Physical Resource Block) may not satisfy OCB (Occupied Channel Bandwidth) requirements in unlicensed bands, necessitating an adaptation of device-to-device direct communication operations to comply with regulations.
Innovation Solution
A terminal is equipped with a reception unit to receive signals, a control unit to determine a channel with an interlace structure for transmitting feedback information, and a transmission unit to utilize a common interlace and dedicated resource for adapting to unlicensed band regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conventional PSFCH format of one PRB is used, then the device complexity is reduced, but the OCB requirements in unlicensed bands are not satisfied
Solution Approach 1:
The channel is divided into multiple interlaces, where each interlace consists of multiple PRBs distributed across the frequency spectrum. This segmentation allows the feedback channel to occupy a sufficient bandwidth to meet OCB requirements while maintaining a structured and manageable channel format through the interlace organization.
Solution Approach 2:
The patent transitions from a single-dimensional PRB structure to a two-dimensional interlace structure that spans multiple frequency resources. By organizing PRBs into interlaces distributed across frequency, the system achieves the required occupied channel bandwidth without simply expanding a single contiguous block, thus meeting OCB requirements with a more efficient resource distribution pattern.
2Reliability
If an interlace structure with multiple PRBs is used, then the OCB requirements are satisfied, but the device complexity increases
Solution Approach 1:
The interlace structure is designed to serve multiple functions simultaneously: it meets OCB requirements, provides robust feedback transmission through frequency diversity, and maintains compatibility with existing D2D communication frameworks. The common interlace concept allows multiple terminals to share the same interlace structure, reducing individual device complexity while ensuring regulation compliance.
Solution Approach 2:
The patent modifies the channel structure parameters by introducing the interlace concept with specific PRB spacing and distribution patterns. By carefully selecting interlace parameters (such as the frequency spacing between PRBs within an interlace), the system achieves the required occupied channel bandwidth while controlling the complexity through standardized parameter sets that can be configured based on specific deployment scenarios.
Data Source
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AI summary
A terminal includes: a reception unit configured to receive a signal from another terminal in an unlicensed band; a control unit configured to determine a channel to which an interlace structure is applied, the channel being used for transmitting feedback information for the signal to the another terminal; and a transmission unit configured to transmit the feedback information to the another terminal via the channel. The control unit expects that the channel is to include a common interlace among terminals and a resource that is dedicated to the terminal, and expects that the dedicated resource is to be associated with the common interlace.