Sidelink Carrier Selection Triggering in V2X Systems
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently triggering transmission carrier selection, particularly when new data for a second V2X service is available in a logical channel not associated with the selected carrier, leading to potential failures in carrier re-selection in scenarios with multiple configured carriers.
Innovation Solution
Implementing a new triggering condition for transmission carrier selection, where if data is available in a sidelink traffic channel with no configured grant on any carrier, the system triggers a carrier re-selection procedure, allowing selection of a new carrier based on channel busy ratio (CBR) or proximity-based services (ProSe) per-packet priority (PPPP) for the sidelink traffic channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier selection is based on configured grants only, then the structure is simple, but carrier re-selection fails when new data is available in unassociated carriers
Solution Approach 1:
The patent applies preliminary action by establishing a triggering mechanism that proactively detects when new data becomes available in sidelink traffic channels and initiates carrier re-selection before transmission failures occur. The MAC entity continuously monitors data availability in STCHs and automatically triggers carrier selection procedures when configured grants are insufficient, ensuring proactive adaptation to changing transmission needs.
Solution Approach 2:
The patent implements feedback by creating a closed-loop system where the MAC entity monitors data availability in sidelink traffic channels and uses this information to trigger carrier re-selection. The system receives feedback about data presence in STCHs and adjusts carrier selection accordingly, ensuring that transmission resources are dynamically allocated based on actual data availability and channel conditions.
2Productivity
If multiple carriers are configured without dynamic selection, then the structure is simple, but data transmission efficiency decreases when new data is available in unassociated carriers
Solution Approach 1:
The patent applies dynamics by transforming the static carrier configuration into a dynamic selection mechanism. The MAC entity continuously evaluates data availability in different carriers and dynamically triggers carrier re-selection when new data becomes available in unassociated carriers. This dynamic approach allows the system to adapt to changing transmission requirements and optimize data transmission efficiency in real-time.
Solution Approach 2:
The patent implements parameter changes by modifying the carrier selection criteria from static configured grants to dynamic data availability monitoring. The system changes the triggering parameters from grant-based to data-driven, enabling carrier re-selection based on actual data presence in STCHs. This parameter change allows the system to optimize transmission efficiency by selecting carriers based on real-time data availability rather than predetermined configurations.
3Reliability
If carrier re-selection is not triggered automatically, then the operation is simple, but service reliability decreases in dynamic communication scenarios
Solution Approach 1:
The patent applies self-service by enabling the MAC entity to automatically monitor data availability and trigger carrier re-selection without external intervention. The system serves itself by continuously checking STCH data presence and autonomously initiating carrier selection procedures when needed. This self-service mechanism ensures reliable service in dynamic communication scenarios while maintaining operational simplicity through automation.
Data Source
AI summary
A method performed by a user equipment (UE) in a wireless communication system, the method including: selecting to create a configured sidelink grant corresponding to transmissions of at least one media access control (MAC) protocol data unit (PDU); and triggering a transmission carrier selection procedure based on (i) data being available in a sidelink traffic channel (STCH) associated with one or more carriers, and (ii) there being no configured sidelink grant on any carrier, among the one or more carriers, that is allowed for the STCH.