HSUPA Uplink Signaling for Lower-Delay PDU Reordering
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Solution Overview
Problem
The existing High Speed Uplink Packet Access (HSUPA) scheme lacks sufficient information for optimal network performance, particularly in terms of signaling for lower delay delivery, leading to unnecessary delays and potential PDU discarding due to ambiguity in reordering and lack of timely communication between the Node-B and the SRNC.
Innovation Solution
Implementing improved signaling mechanisms, including information exchange from the UE to the SRNC and from the Node-B to the SRNC, to optimize reordering operations and reduce delays by providing timely updates on HARQ process status and successful/failed transmissions, thereby minimizing waiting times and preventing unnecessary PDU discarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing HSUPA scheme is used, then the network structure is simple, but the data transmission throughput is insufficient due to lack of timely information about radio transmission failures
Solution Approach 1:
The patent implements preliminary action by having the UE proactively send transmission failure information to the SRNC before the SRNC can detect the failure through normal scheduling operations. This allows the SRNC to be immediately aware of transmission failures and adjust scheduling decisions accordingly, preventing unnecessary retransmission attempts and improving overall throughput without requiring complex real-time coordination mechanisms
Solution Approach 2:
The patent establishes a feedback mechanism where the UE monitors its own transmission status and provides feedback to the SRNC about transmission failures. This feedback loop enables the SRNC to make informed scheduling decisions based on actual transmission outcomes, allowing the system to adapt to changing channel conditions and improve productivity through data-driven scheduling adjustments
2Loss of time
If the UE waits for scheduling decisions from the SRNC, then the scheduling control is centralized, but unnecessary delays occur in the reordering queue
Solution Approach 1:
The UE performs preliminary actions by sending transmission failure information to the SRNC before the SRNC needs to make scheduling decisions. This allows the SRNC to have advance knowledge of transmission status when making scheduling decisions, eliminating the need for the UE to wait in reordering queues for scheduling confirmations, thereby reducing latency while maintaining centralized scheduling control
Solution Approach 2:
The UE autonomously monitors its transmission status and generates failure information without requiring the SRNC to query or wait for status reports. This self-service approach allows the UE to independently manage its transmission state information and provide it to the SRNC on demand, reducing the interaction overhead and waiting time in the scheduling process
3Reliability
If the SRNC discards PDUs after timeout, then the resource management is efficient, but data loss occurs due to premature discarding
Solution Approach 1:
The feedback mechanism allows the SRNC to receive timely information about transmission failures, enabling it to distinguish between PDUs that have actually failed and those that are merely delayed. This prevents premature discarding of PDUs that might still be successfully transmitted, improving reliability while maintaining resource efficiency through informed resource management decisions
Solution Approach 2:
By receiving transmission failure information in advance, the SRNC can make informed decisions about PDU retention and retransmission before timeout occurs. This preliminary information allows the SRNC to extend the waiting period for specific PDUs when transmission failures are detected, preventing premature discarding and improving PDU delivery reliability without significantly impacting overall resource utilization
Data Source
AI summary
Improvements to the High Speed Uplink Packet Access (HSUPA) scheme have been made. Among the three main aspects, providing Optimized Rate Request Reporting, providing Signaling for Lower Delay Delivery, and providing a MAC-e PDU Format for Control Information, the Signaling for Lower Delay Delivery may be considered as the main improvement, while the other two aspects can be supplementary improvements.