Uplink Rate Adaptation Using Bearer Congestion Feedback
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Solution Overview
Problem
Conventional techniques fail to enable user equipment to adapt uplink communication parameters effectively in response to detected congestion, leading to suboptimal performance in high-capacity and low-latency applications like virtual reality due to lack of awareness of uplink congestion at the RAN node.
Innovation Solution
A radio network node dynamically reports uplink congestion to user equipment, enabling adaptive bearer switching and modulation/coding scheme adjustments based on real-time congestion conditions to maintain quality of service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional techniques are used for uplink communication, then device simplicity is maintained, but uplink performance deteriorates due to lack of congestion awareness
Solution Approach 1:
The RAN node provides feedback to the UE about uplink congestion status by transmitting congestion indication information. This feedback loop enables the UE to adapt its uplink transmission parameters (modulation scheme, coding scheme, transport block size) based on actual network conditions, thereby improving uplink traffic delivery performance while maintaining device simplicity.
2Reliability
If adaptive bearer switching is implemented, then quality of service is maintained during congestion, but device complexity increases
Solution Approach 1:
The UE autonomously performs bearer switching based on congestion indications received from the RAN node. The device self-adjusts its transmission parameters and selects appropriate bearers without requiring complex network-side control, thereby maintaining QoS during congestion while limiting the increase in device complexity to basic adaptation logic.
3Productivity
If congestion-aware rate adaptation is implemented, then uplink throughput is improved, but processing requirements at the device increase
Solution Approach 1:
The UE adapts uplink transmission by changing physical layer parameters (modulation scheme, coding scheme, transport block size) based on congestion indications. These parameter adjustments improve uplink throughput under varying network conditions while keeping processing complexity manageable through standardized adaptation rules defined in the patent.
Data Source
AI summary
A radio network node sets up a bearer with a user equipment to facilitate a communication session associated. The node may determine that radio link congestion prohibits delivering session traffic according to a particular quality-of-service via the bearer, and may indicate, to the user equipment, the congestion, or congestion effects, in a bearer congestion report. If a subscription associated with the user equipment does not enable the particular quality-of-service being guaranteed, the user equipment may determine, based on the congestion indicated by the node, a reduced processing quality to apply to transmitting buffered uplink traffic to the node and may report to the node a changed modulation/coding scheme to be used to transmit the buffered traffic. If a subscription associated with the user equipment guarantees the particular quality-of-service, the node may switch to a higher quality/priority bearer to facilitate transmission of buffered uplink traffic according to the particular quality-of-service.