Radio Terminal Adaptive SPS Resource Sensing
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Solution Overview
Problem
Existing V2X communication systems face challenges in efficiently managing sidelink channel resources, leading to contention situations and potential collisions, which can disrupt data transmission and affect Quality of Service (QoS) requirements.
Innovation Solution
A radio terminal equipped with adaptive distributed Semi-Persistent Scheduling (SPS) scheme that determines a SPS configuration, selects and senses sidelink resources, and adjusts transmission based on contention indicators to avoid collisions and maintain QoS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a radio terminal uses semi-persistent scheduling (SPS) for data transmission on sidelink resources, then transmission efficiency is improved, but contention and collision risks increase leading to disrupted transmission
Solution Approach 1:
The radio terminal performs sensing operations in advance before transmitting data on SPS resources. By detecting potential contentions or collisions through prior sensing, the terminal can proactively adjust its transmission strategy, such as selecting alternative resources or modifying transmission parameters, thereby preventing transmission disruptions while maintaining SPS efficiency
Solution Approach 2:
The system implements a feedback mechanism where sensing results about channel occupancy and contention status are fed back to the transmission decision process. This feedback loop enables the radio terminal to adaptively adjust SPS resource usage based on real-time channel conditions, resolving the contradiction between maintaining efficient SPS transmission and avoiding contention-induced disruptions
2Reliability
If a radio terminal performs sensing operations to detect contention, then transmission reliability is improved, but transmission opportunities are lost due to leaving out subset of SPS resources
Solution Approach 1:
Instead of uniformly applying sensing to all SPS resources, the invention selectively applies sensing only to specific subsets of SPS resources that are more prone to contention or where reliability is critical. This localized sensing approach maintains transmission reliability for vulnerable resources while preserving throughput by avoiding unnecessary sensing on other resources
Solution Approach 2:
The system performs sensing on a partial subset of SPS resources rather than all resources. By identifying and sensing only the critical subset of resources where contention is likely to occur, the system achieves sufficient reliability improvement without the excessive action of sensing every resource, thus minimizing throughput loss
3Reliability
If auxiliary radio resources are used for data transmission, then transmission diversity is increased and QoS is maintained, but resource management complexity increases
Solution Approach 1:
The network entity acts as an intermediary that provides pre-configured auxiliary resources and control information to radio terminals. This intermediary role simplifies terminal complexity by offloading the burden of auxiliary resource management to the network, while still enabling transmission diversity and QoS guarantees through the available auxiliary resources
Data Source
AI summary
A first radio terminal of a radio communications network. In one example, the first radio terminal includes an electronic processor, a communication module, and an antenna. The electronic processor is configured, together with the communication module, and the antenna, to cause the radio terminal to transmit, in a first transmission to a second radio terminal, data via a first subset of a set of SPS radio resources, reserve a second subset of the set of SPS radio resources for a subsequent data transmission, and in response to detecting a triggering event, skip the subsequent data transmission.