Buffer Status Report Transmission in Dual Connectivity Small Cells
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Solution Overview
Problem
In a wireless communication system with dual connectivity between User Equipment (UE) and multiple Base Stations (BSs) through a non-ideal backhaul, there is a need for a method to distinguish and transmit Buffer Status Reports (BSRs) specific to each BS, ensuring efficient uplink data transmission.
Innovation Solution
The method involves configuring dual connectivity between the UE and two BSs, receiving RRC reconfiguration messages with identification information to distinguish radio bearers for each BS, and triggering BSRs based on the buffer status of logical channels or channel groups specific to each BS. The UE then transmits these BSRs to the corresponding BSs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE uses radio resources from multiple BSs in dual connectivity, then uplink data transmission capacity is improved, but it becomes difficult to distinguish and manage BSRs for each BS
Solution Approach 1:
The patent segments the BSR management by introducing a specific field in the RRC reconfiguration message that divides and identifies which logical channels belong to which BS. This segmentation allows the UE to separately track and report buffer status for each BS independently, resolving the management complexity while maintaining multi-BS transmission capability
Solution Approach 2:
The patent introduces an intermediary identification field as a mediator between the UE and multiple BSs. This field acts as a reference that links logical channels to specific BSs, enabling the UE to correctly associate and transmit BSRs to the appropriate BS without confusion, thus simplifying the overall management process
2Productivity
If BSRs are transmitted to multiple BSs, then uplink resource allocation efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the identification field and logical channel to BS mapping relationships through RRC reconfiguration messages before actual data transmission begins. This advance setup eliminates the need for dynamic identification during BSR transmission, reducing real-time signaling overhead while maintaining efficient resource allocation
Solution Approach 2:
The patent uses copying by reusing the existing RRC reconfiguration message structure to carry the identification field. Instead of creating a completely new signaling mechanism, the patent copies and extends the existing message format, thereby achieving BS-specific BSR management with minimal additional signaling overhead
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.