Uplink Resource Allocation for Unlicensed Cells Using LBT Priority
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Solution Overview
Problem
Existing technologies face challenges in efficiently managing uplink resource allocation in unlicensed cells, particularly in licensed assisted access (LAA) scenarios, where regulatory requirements and varying radio environments impact Quality of Service (QoS) and data transmission reliability.
Innovation Solution
The implementation of a logical channel prioritization (LCP) procedure that dynamically adjusts uplink resource allocation based on Listen-Before-Talk (LBT) priority classes, ensuring that QoS-sensitive data is prioritized and transmitted over licensed carriers while utilizing unlicensed carriers for less critical data, thereby enhancing fairness and network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink resource allocation is managed using existing technologies in unlicensed cells, then data transmission can occur, but QoS consistency and transmission reliability deteriorate due to regulatory requirements and varying radio environments
Solution Approach 1:
The patent implements dynamic uplink resource allocation where the network device adjusts resource allocation parameters in real-time based on LBT success status and QoS requirements. The allocation changes from static to dynamic, adapting to varying radio environments and LBT outcomes to maintain QoS consistency across different transmission conditions
Solution Approach 2:
The patent changes key allocation parameters including resource block allocation, modulation and coding scheme (MCS), and transmission power based on LBT priority classes and QoS requirements. These parameter adjustments enable the system to adapt to different radio environments while maintaining reliable QoS-sensitive data transmission
2Productivity
If QoS-sensitive data is transmitted on unlicensed carriers, then network capacity increases, but transmission reliability deteriorates due to LBT failures and regulatory constraints
Solution Approach 1:
The patent segments data transmission by QoS sensitivity, routing QoS-sensitive data through licensed carriers with guaranteed reliability while directing less critical data through unlicensed carriers to expand network capacity. This segmentation allows the system to utilize unlicensed spectrum resources without compromising the reliability of critical transmissions
Solution Approach 2:
The patent introduces the LCP procedure as an intermediary mechanism that evaluates QoS requirements and LBT success status to determine optimal transmission paths. This intermediary ensures that unlicensed carrier transmissions meet reliability thresholds before allocating resources, thereby maintaining transmission reliability while utilizing unlicensed capacity
3Productivity
If unlicensed carriers are used to increase network capacity, then spectrum utilization improves, but QoS consistency deteriorates due to LBT priority classes and regulatory requirements
Solution Approach 1:
The patent applies different resource allocation strategies to different data types based on their QoS requirements. QoS-sensitive data receives prioritized allocation with stricter reliability checks, while less critical data utilizes available unlicensed resources with more flexible allocation, achieving both high spectrum utilization and QoS consistency through localized quality adjustments
4Reliability
If dynamic resource allocation is implemented based on LBT priority classes, then QoS consistency improves, but system complexity increases
Solution Approach 1:
The patent performs preliminary classification of data by QoS sensitivity before transmission decisions are made. By pre-categorizing data into QoS-sensitive and less critical groups, the system simplifies subsequent resource allocation decisions while maintaining QoS consistency, reducing the complexity burden of dynamic allocation
Data Source
AI summary
A downlink control information (DCI) may be received. The DCI may comprise an uplink grant for the LAA cell. The uplink grant may comprise transmission parameters. The transmission parameter may comprise: uplink resources for one or more transport blocks (TBs), and an indication of a listen-before-talk (LBT) priority class. One or more first logical channels of the plurality of logical channels may be selected based on the LBT priority class. First uplink resources of the uplink resources to the one or more first logical channels may be allocated. Some remaining uplink resources of the uplink resources may be allocated to one or more second logical channels of the plurality of logical channels in response to the uplink resources not being exhausted. The one or more TBs may be transmitted on the LAA cell.