Wireless Buffer Status Reporting for Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing carrier aggregation and dual connectivity, particularly in handling high data traffic and spectrum demands, where existing technologies struggle to optimize radio resource allocation and interference management in licensed and unlicensed spectra.
Innovation Solution
The implementation of advanced radio resource management techniques, including carrier aggregation, dual connectivity, and licensed assisted access (LAA) with listen-before-talk (LBT) mechanisms, enables efficient use of both licensed and unlicensed spectra by dynamically allocating resources and managing interference through adaptive energy detection thresholds and clear channel assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation and dual connectivity are implemented to handle high data traffic, then network capacity increases, but device complexity and resource management difficulty increase
Solution Approach 1:
The patent segments the uplink buffer into multiple independent buffer status reports, each associated with specific logical channel groups. This segmentation allows the device to report buffer status for different logical channel groups separately, simplifying the management of aggregated carriers by providing granular control over resource allocation reporting.
Solution Approach 2:
The patent introduces a new dimension to buffer status reporting by associating BSR triggers with specific logical channel groups rather than reporting overall buffer status. This dimensional change in reporting granularity enables more efficient resource management across aggregated carriers by allowing selective reporting based on logical channel group priorities and characteristics.
2Productivity
If multiple logical channels are aggregated to increase data throughput, then productivity improves, but the difficulty of detecting and measuring buffer status accurately increases
Solution Approach 1:
The patent divides the buffer status reporting into separate reports for different logical channel groups. Each BSR contains buffer status information specific to its associated logical channel group, enabling accurate detection and measurement of buffer status for each group independently, thus resolving the difficulty of measuring aggregate buffer status across multiple logical channels.
3Productivity
If buffer status reporting is triggered for each logical channel group to improve resource allocation, then spectral efficiency improves, but signaling overhead and device complexity increase
Solution Approach 1:
The patent applies local quality by associating specific BSR triggers with specific logical channel groups based on their characteristics and priorities. Not all logical channel groups trigger BSRs under the same conditions - each group has customized trigger criteria, allowing spectral efficiency optimization for critical channels while reducing signaling overhead for less critical channels.
Solution Approach 2:
The patent implements partial action by triggering BSRs selectively for specific logical channel groups rather than for all channels simultaneously. This approach achieves spectral efficiency improvement for high-priority channels without the excessive signaling overhead that would result from reporting all logical channel groups in every BSR transmission.
Data Source
AI summary
A wireless device receives configuration parameters for a first logical channel indicating a first mapping restriction of the first logical channel to at least one first radio resource type of a plurality of radio resource types. The at least one first radio resource type indicates one of a licensed radio resource type or an unlicensed radio resource type. An uplink grant indicating radio resources of a radio resource type in the plurality of radio resource types is received. Based a determination that the radio resource type of the uplink grant is one of the at least one first radio resource type based on the first mapping restriction, a first buffer status report (BSR) retransmission timer for triggering a BSR indicating an amount of data comprising data of a buffer of the first logical channel is restarted. A BSR transmission is triggered in response to the first BSR retransmission timer expiring.