HSDPA Activation Control via Cell Change Threshold
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Solution Overview
Problem
HSDPA mode in wireless networks experiences significant latency and throughput degradation due to data loss and HARQ process re-establishment during frequent serving cell changes, particularly in high-speed user equipment (UE) movements or when UE roams across Node B boundaries, leading to poor performance.
Innovation Solution
Implementing a method where user equipment (UE) or network nodes determine if the number of serving HSDPA cell changes exceeds a threshold within a predetermined time period, triggering a transition from HSDPA to DCH mode to avoid data loss and HARQ process re-establishment, thereby improving network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HSDPA mode is used to achieve higher data rates, then throughput is improved, but latency increases significantly during frequent serving cell changes
Solution Approach 1:
The system dynamically switches between HSDPA and DCH modes based on the frequency of serving cell changes. When cell changes are frequent, the system transitions from HSDPA to DCH mode to avoid the latency penalty of HARQ re-establishment, and switches back to HSDPA when cell changes become infrequent, optimizing performance adaptively
Solution Approach 2:
The invention changes the operational mode parameter (HSDPA vs DCH) based on the observed frequency of serving cell changes. By monitoring the number of cell changes within a time window and comparing against a threshold, the system adjusts the data transmission mode to balance throughput and latency requirements
2Reliability
If HSDPA operation is maintained during frequent cell changes, then data buffering at Node B is preserved, but data loss occurs due to HARQ entity deletion and re-establishment
Solution Approach 1:
The system performs preliminary detection of frequent cell changes and proactively switches to DCH mode before data loss can occur. By monitoring cell change frequency and detecting the pattern of frequent handovers, the system preemptively transitions to a mode where data is buffered at the RNC rather than Node B, preventing the data loss that would otherwise occur during HARQ re-establishment
Solution Approach 2:
The invention introduces an intermediary mechanism (cell change frequency detection and threshold comparison) that monitors the handover pattern and triggers mode switching. This intermediary layer allows the system to anticipate problematic handover scenarios and switch to DCH mode, where the RNC acts as an intermediary buffer to prevent data loss during cell transitions
3Adaptability or versatility
If serving HSDPA cell changes frequently, then network mobility is supported, but throughput performance decreases significantly
Solution Approach 1:
The system dynamically adapts the data transmission mode based on mobility patterns. By continuously monitoring serving cell changes and comparing the frequency against a threshold, the system automatically transitions between HSDPA (for stationary or low-mobility scenarios) and DCH (for high-mobility scenarios), thereby maintaining optimal throughput performance across varying mobility conditions
Data Source
AI summary
A method and a user equipment (“UE”), for High Speed Downlink Packet Access (“HSDPA”) de-activation, the method determining whether a number of serving HSDPA cell changes of the UE exceeds a threshold within a predetermined time period; and; sending a transition indication from the UE to a network node to deactivate HSDPA if the threshold is exceeded for within the predetermined time period. Also, a method and a network node, for High Speed Downlink Packet Access de-activation, the method determining whether a number of serving HSDPA cell changes of a user equipment communicating with the network node exceeds a threshold within a predetermined time period; and; deactivating HSDPA for the UE if the threshold is exceeded within the predetermined time period.