Sidelink Resource Reservation With Hopping to Avoid Selection Collisions
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Solution Overview
Problem
Resource selection collisions occur between terminal devices using random and sensing-based resource selection schemes in sidelink communications, particularly affecting pedestrian UEs, leading to reliability issues and power consumption challenges.
Innovation Solution
Implement a resource reservation mechanism where terminal devices using random resource selection employ pseudo-random frequency and/or time domain hopping for subsequent transmissions, with a predetermined hopping rule known to all devices in the resource pool, to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If terminal devices use random resource selection scheme, then device complexity and power consumption are reduced, but resource selection collisions increase and reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by having terminal devices perform resource reservation in advance for subsequent transmissions. Devices select resources from a resource pool and reserve them for future use, indicated through sidelink control information. This advance reservation allows other devices to predict and avoid these resources, preventing collisions before they occur while maintaining the simplicity of random selection for initial resource acquisition.
2Reliability
If terminal devices use sensing-based resource selection scheme, then resource selection collisions are reduced, but device complexity and power consumption increase
Solution Approach 1:
The patent applies local quality by allowing different terminal devices to use different resource selection schemes based on their specific needs and capabilities. Vehicle UEs with higher power supplies can use sensing-based selection for better reliability, while pedestrian UEs with power saving requirements can use random selection with reservation. This differentiated approach optimizes the balance between complexity and reliability for each device type rather than imposing a uniform solution.
3Use of energy by moving object
If terminal devices use random resource selection, then power consumption is reduced, but resource selection collisions with sensing-based devices increase
Solution Approach 1:
The patent introduces resource reservation as an intermediary mechanism that bridges random and sensing-based selection schemes. When random selectors reserve resources and announce them through sidelink control information, this creates a virtual sensing mechanism that allows sensing-based devices to avoid these resources without requiring random selectors to perform actual sensing operations. This intermediary approach enables coexistence while maintaining low power consumption for random selectors.
Data Source
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AI summary
Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of resource selection and reservation in sidelink transmissions. The method comprises: selecting, from a resource pool, a first resource for transmission of the first device in a first transmission period, the resource pool preconfigured for sidelink transmissions; in accordance with a determination that a resource reservation for the transmission is based on a hopped resource reservation scheme, determining, from the resource pool, a reserved resource for a further transmission of the first device in a second transmission period based on sidelink control information, the second transmission period is after the first transmission period; and transmitting the transmission on the first resource with the sidelink control information on a physical sidelink channel, the sidelink control information indicating the reserved resource. In this way, resource selection collisions in the same resource pool can be avoided.