Uplink Grant Segmentation for LAA Spectrum Utilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing carrier aggregation and spectrum utilization, particularly in meeting increasing data traffic demands and providing seamless mobility with limited licensed spectrum.
Innovation Solution
The implementation of Licensed Assisted Access (LAA) technology, which enables the use of unlicensed spectrum through listen-before-talk procedures and adaptive energy detection thresholds, allows for efficient carrier aggregation and resource allocation across licensed and unlicensed bands, optimizing network capacity and mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented to meet increasing data traffic demands, then network capacity is improved, but device complexity and spectrum management difficulty increase
Solution Approach 1:
The patent segments the uplink grant indication into multiple parts: a first uplink grant in a first downlink control information (DCI) message and a second uplink grant in a second DCI message. This segmentation allows the system to manage complex carrier aggregation scenarios by breaking down resource allocation into manageable components, reducing the processing burden on devices while maintaining high network capacity.
Solution Approach 2:
The patent introduces a time dimension to resource allocation by indicating resources in consecutive time intervals (first time interval and second time interval). This temporal dimension allows the system to handle complex carrier aggregation scenarios more efficiently by distributing resource allocation across multiple time slots, thereby reducing instantaneous device complexity while maintaining overall network capacity.
2Quantity of substance
If unlicensed spectrum is utilized through LAA technology, then spectrum utilization is improved, but coexistence management and regulatory compliance complexity increase
Solution Approach 1:
The patent employs listen-before-talk (LBT) procedures as a preliminary action before utilizing unlicensed spectrum resources. The LBT mechanism allows devices to sense the channel and determine if it is available for transmission, thereby managing coexistence with other technologies and ensuring regulatory compliance before resource allocation occurs. This preliminary action reduces the complexity of real-time coexistence management while maximizing spectrum utilization.
3Measurement precision
If adaptive energy detection thresholds are implemented, then detection accuracy is improved, but processing requirements and energy consumption increase
Solution Approach 1:
The patent implements adaptive energy detection thresholds that dynamically adjust based on the detected energy levels in the unlicensed spectrum. The threshold is set as a function of the detected energy, allowing the system to achieve high detection accuracy in varying radio conditions while optimizing energy consumption by avoiding unnecessary processing in low-interference environments. This dynamic adaptation balances measurement precision with energy efficiency.
Data Source
AI summary
A wireless device receives an uplink grant indicating radio resources in m consecutive subframes 0 to m−1, where m is two or more. For each subframe of the m consecutive subframes store, a respective packet is stored. In response to a determination that the wireless device cannot access a channel for a transmission in subframe k, k∈{0, . . . , m−2}: the respective packet stored for subframe k is not transmitted; and a listen-before-talk procedure indicating that the channel is clear in subframe k+1 is performed. The respective packet stored for each subframe of subframes k+1 to m−1 are transmitted via subframes k+1 to m−1.