Dynamic Data Forwarding Timer for Enhanced Uplink Latency
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Solution Overview
Problem
Existing methods for forwarding non-consecutive data blocks in enhanced uplink transmissions face challenges in managing latency and quality of service due to inefficiencies in setting the data forwarding timer, leading to potential delays and unnecessary retransmissions.
Innovation Solution
Implementing a method where a re-ordering entity in the Node-B or RNC identifies missing data blocks and uses a data forwarding timer to determine if the block has been discarded by the WTRU, prioritizing data blocks based on sequence numbers and priority, allowing for immediate forwarding of non-consecutive data blocks when certain conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a data forwarding timer is used to deliver non-consecutive data blocks to higher layers, then sequential delivery is maintained, but transmission latency increases and quality of service deteriorates
Solution Approach 1:
The patent applies dynamics by making the data forwarding timer adjustable rather than fixed. The timer duration is dynamically adapted based on QoS parameters and transmission conditions, allowing the system to balance between sequential delivery stability and latency reduction. When QoS requirements demand low latency, the timer can be shortened or bypassed, while maintaining sequential delivery when stability is prioritized.
Solution Approach 2:
The patent changes the parameter of timer duration from a static value to a dynamically adjustable parameter. By modifying the timer duration based on QoS requirements, transmission priority, and network conditions, the system can optimize the trade-off between maintaining sequential delivery and reducing transmission latency, directly addressing the technical contradiction.
2Loss of time
If the data forwarding timer duration is set short, then transmission latency is reduced, but out of sequence transmissions are incorrectly perceived leading to unnecessary retransmissions
Solution Approach 1:
The patent implements feedback mechanisms where the system monitors transmission sequences and QoS parameters continuously. When a short timer causes potential out-of-sequence delivery, the feedback loop detects this condition and adjusts subsequent timer settings or triggers retransmission only when truly necessary, reducing unnecessary retransmissions while maintaining low latency.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple timer duration values based on different QoS profiles and transmission conditions. Before actual data transmission, the appropriate timer duration is selected based on expected conditions, preventing both excessive latency and false out-of-sequence detection from occurring in the first place.
3Stability of the object's composition
If the data forwarding timer duration is set long, then sequential delivery is maintained, but detection and recovery of failed transmissions is delayed
Solution Approach 1:
The patent makes the timer duration dynamic rather than long and fixed. The system continuously adapts the timer duration based on real-time QoS requirements and transmission status, allowing short timers for reliable transmissions and longer timers only when sequential delivery is critically important, thereby not delaying failed transmission detection and recovery.
Solution Approach 2:
The patent changes the timer parameter from a long fixed value to an adaptable parameter that can be adjusted based on QoS profiles and transmission conditions. This allows the system to maintain sequential delivery when needed while avoiding excessively long timers that would delay failed transmission recovery, directly resolving the contradiction between stability and reliability.
4Device complexity
If a fixed timer mechanism is used for forwarding data blocks, then implementation is simple, but quality of service requirements cannot be met due to unavoidable latency
Solution Approach 1:
The patent transitions from a simple fixed timer to a dynamic timer mechanism that adapts to QoS requirements. While this increases implementation complexity, it enables the system to meet stringent QoS latency requirements by adjusting timer duration based on transmission priority, data type, and network conditions, making the complexity worthwhile for QoS compliance.
Solution Approach 2:
The patent changes the timer parameter from fixed to variable, allowing different timer durations for different QoS scenarios. This parameter change enables the system to reduce transmission latency for time-sensitive data while maintaining simpler fixed timer behavior for less critical transmissions, balancing complexity and QoS performance.
Data Source
AI summary
A method and apparatus for forwarding non-consecutive data blocks in enhanced uplink (EU) transmissions. A wireless transmit/receive unit (WTRU) and one or more Node-Bs include one or more automatic repeat request (ARQ)/hybrid-ARQ (H-ARQ) processes for supporting an enhanced dedicated channel (E-DCH). Data blocks transmitted by the WTRU are re-ordered in a re-ordering entity located in the Node-B(s) or a radio network controller (RNC). Once a missing data block is identified, a data forwarding timer in the Node-B(s) or RNC is initiated and subsequent WTRU transmissions are monitored to determine whether the missing data block has been discarded by the WTRU. Upon recognition of the discard of the missing data block, the non-consecutive data blocks are forwarded to higher layers.