GSM Radio Device Synchronization via SCH Burst Detection
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Solution Overview
Problem
Current GSM receiver systems face challenges in reducing latency and energy consumption during cell selection, handover, and cell reconfirmation processes due to the need for FCCH detection followed by SCH detection, which is time-consuming and power-intensive, especially in multi-RAT scenarios with limited measurement gaps.
Innovation Solution
The method involves using only the SCH channel for burst boundary detection and frequency error estimation, employing a front-end SCH detection module with a reference array based on the training sequence (TSC) to synchronize with the network node, thereby skipping FCCH detection and reducing processing cycles and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FCCH detection is performed before SCH detection, then frequency error estimation is improved, but latency and energy consumption increase
Solution Approach 1:
The patent extracts and removes the FCCH detection step from the traditional two-step synchronization process. By using only SCH detection with a front-end detector that directly processes SCH bursts for frequency error estimation, the patent eliminates the intermediate FCCH detection stage, thereby reducing latency while maintaining frequency error estimation capability
Solution Approach 2:
The patent segments the SCH burst processing into two functional parts: a front-end detector for rapid frequency error estimation and burst boundary detection, and the traditional SCH decoding for complete synchronization information. This segmentation allows the critical frequency estimation function to be performed independently and rapidly without waiting for complete SCH decoding
2Measurement precision
If FCCH detection is performed before SCH detection, then frequency error estimation is improved, but energy consumption increases
Solution Approach 1:
The patent removes the FCCH detection stage entirely, extracting only the necessary frequency error estimation function and implementing it directly through SCH burst processing. This eliminates the redundant energy expenditure of detecting and processing FCCH bursts while maintaining the essential frequency synchronization capability
Solution Approach 2:
The patent performs partial frequency error estimation using only the necessary portions of SCH bursts rather than completing full SCH decoding for every frequency estimation task. The front-end detector processes SCH bursts to extract frequency error information without requiring complete demodulation and decoding, thereby reducing energy consumption while achieving the essential synchronization function
3Productivity
If only SCH channel is used for synchronization, then processing speed is improved, but measurement precision may be compromised
Solution Approach 1:
The patent performs preliminary frequency error estimation and burst boundary detection using the front-end detector on SCH bursts before proceeding to complete SCH decoding. This preliminary action extracts the critical frequency synchronization information from SCH bursts in advance, enabling rapid synchronization while maintaining accuracy through the dedicated front-end detection algorithm
Data Source
AI summary
The present disclosure relates to a method for synchronizing a radio device with a network node of a Global System for Mobile Communications, GSM, radio communication system. The method comprises obtaining a reference array based on a known training sequence, TSC, of a synchronization burst, SB, of a synchronization channel, SCH, of the network node. The method also comprises receiving an SB including the TSC from the network node and forming a received array. The method also comprises comparing the reference array to the received array for finding a sequence of the received array which has identity with the reference array, and thereby finding the position of the TSC in the received SB. The method also comprises determining whether the identity of the found sequence with the reference array is above a predefined threshold, in which case the radio device can be time synchronized based on the found TSC.