Carrier Aggregation Resource Allocation
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Solution Overview
Problem
Current LTE V2X resource allocation algorithms face challenges with multi-carrier transmission, including half-duplex constraints, hardware limitations, and power restrictions, which can lead to performance losses and compatibility issues when extending autonomous resource allocation to multiple carriers.
Innovation Solution
The proposed solution involves a method where resource allocation on one carrier is performed based on the selection of resources from another carrier, ensuring that selections are interdependent to mitigate performance losses due to multi-carrier transmission limitations, allowing for simultaneous or staggered transmission on multiple carriers while adhering to half-duplex constraints and power considerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autonomous resource allocation is extended to multiple carriers, then transmission capacity and reliability are improved, but half-duplex constraints and hardware limitations cause performance losses
Solution Approach 1:
The patent implements dynamic resource allocation where the UE adapts its transmission parameters based on real-time conditions. The selection of candidate resources and determination of transmission parameters (power, MCS) are dynamically adjusted according to channel conditions, interference levels, and half-duplex constraints, allowing the system to optimize performance under varying operational conditions while maintaining reliability across multiple carriers.
Solution Approach 2:
The patent changes key transmission parameters including power allocation across carriers, modulation and coding scheme (MCS) selection, and resource block allocation. By dynamically adjusting these parameters based on channel quality indicators and interference measurements, the system achieves reliable transmission on multiple carriers while adapting to half-duplex constraints and hardware limitations, thereby resolving the contradiction between reliability and efficiency.
2Ease of operation
If resources are allocated independently on each carrier, then resource allocation simplicity is maintained, but inter-carrier interference and power distribution issues arise
Solution Approach 1:
The patent merges resource allocation decisions across multiple carriers by implementing joint resource selection. The UE determines a set of candidate resources considering all configured carriers simultaneously, and selects transmission resources based on combined channel conditions and interference measurements from all carriers. This unified approach maintains operational simplicity while improving reliability by coordinating resource usage across carriers to avoid inter-carrier interference and optimize power distribution.
3Productivity
If transmission power is distributed across multiple carriers, then total transmission capacity increases, but power per carrier decreases leading to reduced signal quality
Solution Approach 1:
The patent applies local quality optimization by allocating transmission power and resources differently across carriers based on their specific channel conditions. The UE evaluates channel quality indicators and interference levels for each carrier independently, then distributes power and selects modulation schemes optimized for each local condition. This allows the system to maintain high signal quality on each carrier while achieving high total transmission capacity across the aggregated carriers.
Data Source
AI summary
A method in a radio device of radio resource allocation for transmitting data on a plurality of communication carriers is provided. The method includes sensing on a first carrier and obtaining a first set of candidate radio resources for a first transmission on the first carrier, performing a first selection of one or a plurality of the candidate radio resources from the first set to be used for the first transmission, sensing on a second carrier and obtaining a second set of candidate radio resources for a second transmission on the second carrier, performing a second selection of one or a plurality of the candidate radio resources from the second set to be used for the second transmission, and performing the first selection and the second selection in dependency to each other.