UMTS Node B BCH PDU Encoding Error Detection
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Solution Overview
Problem
In UMTS systems, scheduling errors in broadcast channel protocol data units (BCH PDU) can lead to incorrect system information being transmitted to user equipment, potentially causing it to be placed out of service due to undetected errors in scheduling information during the system information update procedure.
Innovation Solution
A method for encoding BCH PDU based on broadcast control channel (BCCH) scheduling errors at Node B, involving error detection and cancellation of the system information update procedure for each system frame number (SFN) if an error is found, ensuring accurate encoding and preventing erroneous transmission to user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If system information update procedure is performed without error detection, then transmission speed is improved, but reliability deteriorates due to undetected scheduling errors
Solution Approach 1:
The patent applies preliminary action by performing error detection on scheduling information before the system information update is transmitted. The Node B checks whether the received scheduling information from RNC is correct before using it to generate BCH PDU, preventing erroneous information from being transmitted to user equipment.
Solution Approach 2:
The patent implements feedback by having the Node B send error detection results back to the RNC. When a scheduling error is detected, the Node B notifies the RNC, which then retransmits the corrected scheduling information, creating a closed-loop error correction mechanism.
2Reliability
If error detection and cancellation procedure is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the error detection process into distinct modular steps: receiving scheduling information, detecting errors in the received information, and canceling the update procedure if errors are found. This modular approach makes the complex error detection process more manageable and implementable.
3Measurement precision
If scheduling error detection is performed for every SFN, then measurement precision is improved, but loss of time increases due to repeated error checking
Solution Approach 1:
The patent performs error detection on scheduling information before system information is encoded and transmitted. By detecting errors in advance at the Node B before BCH PDU generation, the system avoids wasting time transmitting erroneous information that would later need to be corrected.
Data Source
AI summary
A method for encoding a broadcast channel protocol data unit (BCH PDU) based on a broadcast control channel (BCCH) scheduling error in a universal mobile telecommunications system (UMTS) having a Node B and a radio network controller includes setting up a call between the radio network controller and the Node B to receive system information and scheduling information for a system information update from the radio network controller; initializing broadcast channel protocol data units and control information for every system frame number (SFN) at the Node B; and detecting the broadcast control channel scheduling error on the scheduling information for the system information update based on segment types of the system information when combining the system information for every system frame number. In case the broadcast control channel scheduling error is not detected, the broadcast channel protocol data units are encoded to be incorporated therein the system information.