UE Carrier Selection via CBR and Grant Timing
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) performing parallel transmissions on multiple carriers can exacerbate congestion by independently selecting resources on each carrier, leading to increased congestion on already congested carriers.
Innovation Solution
The UE allocates resource grants on multiple carriers, selects a carrier based on allocated time or channel busy ratio (CBR) to prioritize resource allocation, and transmits medium access control protocol data units (MAC PDUs) using the selected carrier, thereby optimizing resource usage and reducing congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE performs parallel transmissions on multiple carriers by independently selecting resources on each carrier, then the transmission capacity is improved, but the network congestion is worsened
Solution Approach 1:
The UE monitors channel busy ratios (CBR) on each carrier and uses this feedback information to dynamically adjust resource selection. The CBR measurement provides real-time feedback about carrier congestion levels, enabling the UE to make informed decisions about which carriers to use for transmission, thereby avoiding excessive congestion while maintaining transmission capacity
Solution Approach 2:
The patent changes the selection parameter from independent random selection to selection based on CBR values and resource grant timing. By using CBR as a parameter to guide carrier selection and resource allocation, the system optimizes resource distribution across carriers, reducing congestion on already busy carriers while maintaining overall transmission capacity
2Productivity
If the UE independently selects resources on each carrier for parallel transmissions, then the resource utilization is improved, but the congestion on specific carriers is worsened
Solution Approach 1:
The patent introduces CBR as a key parameter for resource selection and changes the selection criterion from uniform independent selection to selection based on CBR values. This parameter change enables differentiated resource allocation across carriers, directing more resources to less congested carriers while maintaining high overall resource utilization
Solution Approach 2:
The resource selection becomes dynamic and adaptive rather than static and independent. The UE continuously monitors CBR values and adjusts its resource selection strategy accordingly, making the system flexible and responsive to changing network conditions, thereby optimizing resource utilization while avoiding congestion
3Loss of time
If the UE selects carriers based on earliest resource grant time, then the transmission timing is optimized, but the flexibility in carrier selection is reduced
Solution Approach 1:
The network pre-configures resource grants with timing information, and the UE uses this preliminary timing information to determine carrier selection. By having resource grants allocated in advance with timing indicators, the UE can optimize transmission timing while still maintaining flexibility through the multi-carrier configuration provided by the network
Solution Approach 2:
The patent uses resource grant timing as a selection parameter alongside CBR values. This parameter change enables the UE to balance timing optimization with carrier selection flexibility by considering both when resources are granted and the current congestion state of carriers
Data Source
AI summary
Provided are a method for a user equipment (UE) to transmit a medium access control protocol data unit (MAC PDU) in a wireless communication system, and an apparatus supporting the same. The method may include: allocating resource grants on multiple carriers; selecting a first carrier among the multiple carriers, based on allocated time of the resource grants; allocating a resource of the selected first carrier to a logical channel with the highest priority; and transmitting the MAC PDU, by using the resource of the selected first carrier.