UMTS NodeB E-DCH Indicator for RNC TSN Queue Flush
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Solution Overview
Problem
Ambiguous conditions in the Universal Mobile Telecommunications System (UMTS) network lead to incorrect delivery of out-of-order Transmission Sequence Numbers (TSN) by the Radio Network Controller (RNC), resulting in redundant retransmissions and negative impacts on capacity and latency due to unclear re-acquisition of common Enhanced Dedicated Channel (E-DCH) resources by User Equipment (UE).
Innovation Solution
A method where the UMTS base station (NodeB) determines if UE has re-acquired common E-DCH resources and transmits an indicator to the RNC to recognize the beginning of a new transmission session, prompting actions such as flushing the TSN re-ordering queue and restarting the MAC-is re-ordering algorithm, thereby avoiding ambiguity and improving resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the RNC delivers out-of-order TSN to the next higher layer, then the transmission speed is improved, but the reliability deteriorates due to redundant retransmissions and capacity reduction
Solution Approach 1:
The patent introduces an intermediary mechanism (the indicator signal from NodeB to RNC) that mediates between the UE's resource re-acquisition and the RNC's TSN delivery decisions. This intermediary allows the system to distinguish between legitimate retransmissions and new transmissions, enabling the RNC to deliver TSN out-of-order for speed while maintaining reliability through proper identification of transmission contexts.
2Reliability
If the RNC waits for in-sequence TSN before delivering data, then the reliability is improved, but the loss of time increases due to delayed delivery
Solution Approach 1:
The patent applies preliminary action by having the NodeB detect and report UE resource re-acquisition events to the RNC in advance. This allows the RNC to prepare for proper TSN handling before actual data delivery is needed, enabling it to maintain reliability through pre-identified transmission contexts while avoiding unnecessary delays by having the re-ordering queue flushed proactively when needed.
3Reliability
If the RNC implements strict TSN ordering, then the reliability is improved, but the device complexity increases due to additional re-ordering queue management
Solution Approach 1:
The patent extracts the complexity of TSN re-ordering queue management by introducing a trigger mechanism that selectively flushes the queue based on UE resource re-acquisition events. Instead of continuously managing complex re-ordering states, the system uses the NodeB's detection of resource re-acquisition to extract and clear obsolete TSN entries, simplifying the overall management while maintaining reliability.
4Adaptability or versatility
If the UE re-acquires common E-DCH resources frequently, then the adaptability is improved, but the loss of time increases due to repeated resource acquisition cycles
Solution Approach 1:
The patent implements feedback by having the NodeB detect UE resource re-acquisition events and provide this information to the RNC through indicator signals. This feedback mechanism allows the RNC to understand why the UE is re-acquiring resources (e.g., due to traffic pattern changes) and adjust its TSN delivery behavior accordingly, enabling adaptive resource management that reduces unnecessary acquisition cycles and associated time losses.
Data Source
AI summary
A method and system in which a UMTS base station determines if any UE has re-acquired a common Enhanced Dedicated Channel (E-DCH) resource, and responsively transmits a indicator toward an RNC that is adapted to cause the RNC to recognize the beginning of a new transmission session so that the RNC may responsively perform appropriate actions such as flushing the TSN re-ordering queue, restarting a MAC-is re-ordering algorithm and the like.