UMTS State Transitions Without Radio Bearer Mapping Checks
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Solution Overview
Problem
In UMTS wireless communication systems, user equipment (UE) often enters idle mode unnecessarily when transitioning from paging states to bidirectional communication states due to the requirement for radio bearer mapping checks, which disrupts communication and resource usage.
Innovation Solution
The method omits radio bearer mapping checks for transitions from paging states (URA_PCH or CELL_PCH) to bidirectional communication states (CELL_FACH) by sending update messages on SRB0, allowing direct configuration and state transitions without requiring RACH/FACH mappings, thus preventing unnecessary idle mode entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio bearer mapping checks are performed before transitioning from paging states to bidirectional communication states, then communication reliability is ensured, but unnecessary idle mode entry occurs and communication continuity is disrupted
Solution Approach 1:
The patent extracts the radio bearer mapping check step from the state transition process. Specifically, when transitioning from paging states (CELL_PCH or URA_PCH) to bidirectional communication state (CELL_FACH), the UE omits the radio bearer mapping check that would normally be performed, thereby preventing unnecessary idle mode entry and maintaining communication continuity while still ensuring reliability through alternative mechanisms
Solution Approach 2:
The patent inverts the conventional approach by allowing state transition without prior radio bearer mapping checks. Instead of checking mappings before transition, the system performs updates on SRB0 (a signaling radio bearer with fixed mapping) and only checks radio bearer mappings for the target state after transition is initiated, thus avoiding the harmful effect of premature check failures
2Manufacturing precision
If radio bearer mapping checks are performed before state transitions, then configuration correctness is verified, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies preliminary action by performing the state transition first using SRB0 (which has fixed mapping) before checking radio bearer mappings for the target state. This allows the UE to initiate the transition process without the overhead of preliminary checks, reducing processing complexity while still verifying configuration correctness at the appropriate later stage
Solution Approach 2:
The patent extracts the radio bearer mapping check from the pre-transition phase and relocates it to post-transition verification. This separation eliminates unnecessary processing overhead during the critical transition phase while maintaining configuration correctness verification through selective checking of the target state's mappings
Data Source
AI summary
A method, in a wireless communications device, for transitioning between communication states, the wireless communications device compliant for use in a Universal Mobile Telecommunications System (UMTS), the method comprising: checking for radio bearer mapping information for the communication state being transitioned to prior to sending an update message, where the transition between communication states is not a transition from a paging state to a bidirectional communication state using shared channels; and transitioning to the state to be transitioned to using the checked radio bearer mapping information for that state and sending the update message.