Dynamic SPS Resource Management in V2X Communication Systems
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Solution Overview
Problem
In LTE-based V2X communication systems, existing semi-persistent scheduling (SPS) resources are inefficient due to changes in message arrival time, periodicity, and size, leading to unused or scarce resources, resulting in latency and suboptimal utilization.
Innovation Solution
A method and apparatus for managing SPS resources in V2X communication systems, where a UE receives assistance information from a base station to configure and report SPS settings, and releases them when indicated by PDCCH content, empty transmissions, or timer expiration, using new signaling messages and MAC Control Elements to optimize resource allocation based on traffic patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single semi-persistent scheduling (SPS) configuration is used, then the system structure is simple, but the resource utilization becomes inefficient when message arrival time, periodicity, or size changes
Solution Approach 1:
The patent implements dynamic SPS configuration by allowing the base station to modify existing SPS configurations rather than creating entirely new ones. The UE can indicate changes in traffic patterns, and the base station adjusts the SPS parameters (periodicity, timing offset, resource allocation) dynamically to match the changing conditions, resolving the contradiction between adaptability and complexity
Solution Approach 2:
The patent segments the SPS configuration into multiple independent parameters (periodicity, timing offset, resource allocation, priority) that can be adjusted separately. This allows selective modification of only the affected parameters when traffic patterns change, improving adaptability without requiring complete reconfiguration of the entire SPS setup
2Loss of time
If SPS resources are allocated statically, then the configuration is simple, but latency increases when message arrival time changes
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors its actual traffic patterns and provides feedback information to the base station. When message arrival time or periodicity changes, the UE sends feedback indicating these changes, enabling the base station to adjust the SPS configuration accordingly and reduce latency without complex autonomous decision-making
Solution Approach 2:
The patent applies preliminary action by allowing the UE to pre-configure its traffic pattern characteristics and indicate expected changes before they fully manifest. The base station can proactively adjust SPS parameters in anticipation of changing conditions, reducing latency by preparing resources in advance rather than reacting after changes occur
3Productivity
If existing SPS resources are used without optimization, then the system operation is simple, but resource utilization becomes suboptimal leading to waste or scarcity
Solution Approach 1:
The patent optimizes resource utilization by dynamically changing SPS parameters (periodicity, timing offset, resource allocation, priority level) based on actual traffic conditions. The base station adjusts these parameters to match the UE's current message generation patterns, ensuring efficient resource allocation that adapts to changing productivity requirements without overly complicating operation
Data Source
AI summary
Methods and apparatuses in a sidelink communication system are provided. Configuration information for providing assistance information for a sidelink communication is received from a base station (BS) at a user equipment (UE). The assistance information is transmitted from the UE to the BS in response to the configuration information, in case that a traffic pattern of the UE is changed. The assistance information includes information on the traffic pattern of the UE.