Buffer Status Report Segmentation for Dual Connectivity Uplink
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Solution Overview
Problem
In a small cell environment with dual connectivity to different Base Stations (BSs) through a non-ideal backhaul, existing technologies fail to distinguish and report buffer status effectively for each BS, limiting the capacity and efficiency of uplink data transmission.
Innovation Solution
A method and apparatus for a User Equipment (UE) to configure dual connectivity with multiple BSs, receiving RRC reconfiguration messages, distinguishing logical channels for each BS, and transmitting distinct buffer status reports to the corresponding BSs, enabling effective buffer status reporting across multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE uses radio resources from multiple BSs in dual connectivity, then the uplink data transmission capacity is improved, but the ability to distinguish and report buffer status for each BS deteriorates
Solution Approach 1:
The patent segments the buffer status reporting by introducing separate BSR MAC control elements for each BS (macro cell BS and small cell BS). The UE distinguishes buffer status for different BSs by generating separate BSR reports, each associated with a specific BS through logical channel group mapping. This segmentation resolves the contradiction by maintaining distinct buffer status information for each BS while utilizing multiple radio resources simultaneously.
2Device complexity
If a single BSR is transmitted to one BS, then the reporting mechanism is simple, but the ability to report buffer status for multiple BSs effectively deteriorates
Solution Approach 1:
The patent introduces a new dimension to the buffer status reporting mechanism by adding BS identification information to the BSR MAC control element structure. Instead of using a single scalar BSR value, the system now includes a BS identifier field that enables differentiation of buffer status reports by target BS. This dimensional expansion allows the reporting mechanism to handle multiple BSs effectively while maintaining a relatively simple MAC layer structure.
Data Source
AI summary
The present disclosure relates a method of transmitting a buffer status report by a terminal. The method may include i) receiving an RRC reconfiguration message including identification information, ii) identifying logic channels associated with the first base station and logic channels associated with the second base station, iii) triggering the buffer status report by identifying buffer statuses of the identified logic channels associated with the first base station and the second base station, and transmitting the buffer status reports to the first base station and the second base station.