Sidelink Reserved Resource Reuse Using PSFCH Feedback
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Solution Overview
Problem
Existing communication technologies do not provide feasible solutions for utilizing reserved resources that are not used in initial transmissions in V2X communications.
Innovation Solution
A communication apparatus and method that includes a transmitter transmitting data in a reserved resource, a receiver receiving response information on successful reception, and circuitry determining the usage of a second reserved resource based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reserved resources are allocated for initial transmissions but not used, then resource reservation mechanism is established, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements a mechanism where reserved resources that are not used in initial transmissions are identified and recovered for reuse. The receiver indicates whether the reserved resource is needed for retransmission, and if not, the resource is made available to other communication apparatuses, thereby converting wasted resources into useful assets and improving overall utilization efficiency.
Solution Approach 2:
The patent introduces a feedback mechanism where the receiver provides information about the status of reserved resources after initial transmission. This feedback loop enables the transmitter to determine whether the reserved resource should be reused or released, creating a dynamic resource management system that optimizes allocation based on actual transmission needs.
2Reliability
If reserved resources are allocated for retransmissions, then transmission reliability is improved, but resource flexibility deteriorates
Solution Approach 1:
The patent makes resource allocation dynamic by allowing the status of reserved resources to change based on transmission outcomes. The resource reservation is not fixed but can be adjusted - if the initial transmission succeeds, the resource is released; if it fails, the resource is retained for retransmission. This dynamic approach balances reliability needs with resource flexibility.
Solution Approach 2:
The patent performs preliminary resource reservation for potential retransmissions before the initial transmission occurs. This advance preparation ensures that resources are ready when needed, improving transmission reliability while the preliminary nature allows for later adjustment based on actual transmission success, maintaining resource flexibility.
3Speed
If resource selection is performed without sensing, then transmission speed is improved, but collision probability increases
Solution Approach 1:
The patent performs sensing and resource selection as a preliminary action before transmission occurs. By sensing the channel state and selecting appropriate resources in advance, the system can quickly proceed with transmission without delays, maintaining high speed while reducing collision probability through informed resource selection based on current channel conditions.
Data Source
AI summary
An integrated circuit of a first communication apparatus includes transmission circuitry, reception circuitry, and determination circuitry. The transmission circuitry controls transmitting to a second communication apparatus data in a first reserved resource among at least two reserved resources, each of the at least two reserved resources being selected based on a resource selection or re-selection procedure and being reserved for a transmission to the second communication apparatus. The reception circuitry control receiving from the second communication apparatus a physical sidelink feedback channel (PSFCH) that is used to indicate if the transmission of data in the first reserved resource is successfully received by the second communication apparatus. The determination circuitry controls determining that a second reserved resource among the at least two reserved resources is held by the first communication apparatus and is not used by the first communication apparatus based on the PSFCH.