Sidelink Terminal Scheduling Using Transmission Timing Feedback
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Solution Overview
Problem
Existing technologies face challenges in improving resource utilization efficiency and avoiding delay degradation in terminal-to-terminal direct communication, particularly in sidelink DRX scenarios where base station scheduling may not align with terminal transmission and reception timings.
Innovation Solution
A terminal is equipped with a transmission unit to inform the base station about its transmission and reception timings, and a reception unit to receive resource scheduling information, enabling efficient resource allocation for direct communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a terminal camps on a cell with a wrong physical cell identity, then the terminal can perform random access, but the terminal cannot correctly obtain system information and establish proper communication
Solution Approach 1:
The network side sends downlink data or uplink data to the terminal, and the terminal feeds back an acknowledgment or unacknowledgment message. Based on this feedback, the network side determines whether the physical cell identity is correct and sends indication information to guide the terminal to select a correct physical cell identity for proper system information acquisition.
Solution Approach 2:
Downlink data or uplink data serves as an intermediary carrier to convey implicit information about physical cell identity correctness. The data transmission and acknowledgment process mediates between the terminal's random access attempt and the network's verification of correct cell identity selection.
2Reliability
If the network side monitors all possible physical cell identities, then correct cell identity can be verified, but the network complexity increases significantly
Solution Approach 1:
Instead of monitoring all possible physical cell identities, the network extracts and monitors only the specific physical cell identity that the terminal actually selected. This is achieved by monitoring downlink data or uplink data transmissions, thereby reducing monitoring complexity while maintaining verification reliability.
Solution Approach 2:
The terminal's own data transmission (downlink or uplink) serves as the verification mechanism. The network leverages the terminal's necessary data exchanges to implicitly verify cell identity correctness, eliminating the need for separate verification procedures for each possible cell identity.
3Adaptability or versatility
If the terminal selects a physical cell identity from a larger set, then the terminal has more options for camping, but the probability of selecting a wrong physical cell identity increases
Solution Approach 1:
The network provides feedback through data transmission and acknowledgment processes to indicate whether the selected physical cell identity is correct. This feedback mechanism allows terminals to learn from selection errors and adjust future selections, maintaining adaptability while improving accuracy over time.
Solution Approach 2:
Data transmission serves as an intermediary verification process that indirectly validates physical cell identity selection. The terminal can explore multiple cell options through normal data exchanges, and the network uses these exchanges to verify correctness without requiring the terminal to know in advance which cells are appropriate.
Data Source
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AI summary
A terminal includes a transmission unit configured to transmit, to a base station, information concerning a transmission timing of a transmission source or a timing of a transmission destination being enabled to perform reception in terminal-to-terminal direct communication; and a reception unit configured to receive, from the base station, information for scheduling a resource for terminal-to-terminal direct communication. The transmission unit is configured to perform transmission to a terminal that is the transmission destination using the resource.