Per-Carrier Logical Channel Prioritization for Uplink Carrier Aggregation
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Solution Overview
Problem
Existing uplink communication systems, such as LTE-A, face inefficiencies due to the lack of logical channel prioritization schemes that account for multiple carriers with different characteristics and simultaneous uplink grants, leading to suboptimal resource allocation and increased overhead.
Innovation Solution
Implementing a method for logical channel prioritization at the User Equipment (UE) that assigns priorities on a per-carrier basis, allowing for sequential allocation of uplink grants and traffic based on prioritized bit rates and remaining resources, enabling efficient resource utilization across multiple uplink carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing single-carrier logical channel prioritization schemes are used for multiple carriers, then device complexity is reduced, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent segments the logical channel prioritization process into per-carrier priority management. Each carrier maintains its own priority structure, allowing independent optimization of resource allocation for each carrier while using a unified MAC PDU assembly process. This segmentation enables efficient multi-carrier resource management without requiring completely new complex schemes.
Solution Approach 2:
The patent applies local quality by assigning different priority characteristics to different carriers based on their specific characteristics (e.g., carrier index, bandwidth, channel conditions). Each carrier can have customized priority treatment while maintaining overall system coherence, optimizing resource allocation efficiency for each carrier's specific characteristics.
2Productivity
If multiple uplink grants are processed simultaneously, then uplink throughput is improved, but logical channel prioritization accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by establishing per-carrier priority structures and priority bit rate parameters before processing multiple uplink grants. The UE pre-configures priority information for each carrier, enabling accurate prioritization to be maintained even when multiple grants are processed simultaneously in the same subframe.
Solution Approach 2:
The patent segments the processing of multiple uplink grants by handling each carrier's grants separately through its own priority structure. This segmentation allows simultaneous processing of multiple carriers while maintaining prioritization accuracy through independent per-carrier management of logical channel traffic.
3Productivity
If per-carrier logical channel prioritization is implemented, then resource allocation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using a unified MAC PDU assembly process that handles multiple carriers through a single standardized procedure. The per-carrier priority information is integrated into this universal assembly process, allowing efficient resource allocation without requiring separate complex handling mechanisms for each carrier.
Solution Approach 2:
The patent applies dynamics by making the priority structure adaptable to different carrier characteristics. The UE dynamically selects and applies appropriate priority treatments based on carrier-specific parameters (bandwidth, channel conditions, carrier index), optimizing resource allocation efficiency while maintaining a flexible rather than rigid complex structure.
4Ease of operation
If existing prioritization schemes are used without carrier consideration, then ease of operation is maintained, but uplink performance deteriorates
Solution Approach 1:
The patent applies local quality by tailoring priority treatment to specific carrier characteristics without fundamentally changing the overall scheduling process. Each carrier receives customized priority management based on its characteristics, improving uplink performance while maintaining operational simplicity through localized rather than global changes.
Solution Approach 2:
The patent uses per-carrier priority information as an intermediary element that bridges the simple existing prioritization scheme and the requirements of multi-carrier systems. This intermediary structure enables enhanced uplink performance by mediating between carrier-specific needs and the overall scheduling process, maintaining ease of operation while improving reliability.
Data Source
AI summary
A method and apparatus for logical channel prioritization at a user equipment in a multiple uplink carrier system, the method receiving a set of logical channel priorities at the user equipment, the logical channel priorities being assigned on a per carrier basis; and applying the set of logical channel priorities to each logical channel for carrier selection. Further a method and apparatus for constructing an uplink medium access control protocol data unit at a user equipment in a multiple uplink carrier system, the method sorting possible logical channel and carrier pairings based on logical channel priorities; utilizing a prioritized bit rate process to allocate logical channel traffic in an order determined by the sorting; and performing a remaining resources process to allocate logical channel traffic based on a priority order.