Accumulation Buffer Rescaling for PSS Detection Overflow
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Solution Overview
Problem
Conventional communication systems, such as LTE/E-UTRA, face challenges in efficiently managing buffer overflow conditions during synchronization signal acquisition, which can lead to reduced accuracy in determining cell-specific parameters and increased complexity in initial cell search and handover processes.
Innovation Solution
A method and system for automatically rescaling the accumulation buffer in synchronization systems, where a mobile device monitors the most significant bit of accumulated energy values and right shifts them by a predetermined number of bits when a buffer overflow occurs, maintaining relative scaling and preventing clipping or overflow, thereby ensuring accurate PSS timing hypothesis detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the accumulation buffer is used to accumulate energy values for PSS detection, then the detection sensitivity is improved, but buffer overflow occurs reducing measurement precision
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the scaling factor of the accumulation buffer based on the magnitude of accumulated energy values. When overflow is detected, the system changes the buffer's scaling parameter (right-shifting by a predetermined number of bits) to accommodate larger values while maintaining precision. This resolves the contradiction by allowing the buffer to adapt its capacity rather than being fixed, thus preventing overflow while maintaining detection accuracy.
Solution Approach 2:
The patent implements feedback by monitoring the most significant bit of accumulated energy values to detect overflow conditions. When overflow is detected, the system feeds back by rescaling the buffer contents through right-shifting operations. This continuous monitoring and adjustment mechanism ensures that the buffer maintains appropriate precision levels without overflowing, resolving the contradiction between detection sensitivity and overflow prevention.
2Reliability
If the accumulation buffer size is increased to prevent overflow, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the buffer's effective size adjustable rather than fixed. Through dynamic rescaling operations (right-shifting by predetermined bits) triggered by overflow detection, the system can effectively increase buffer capacity when needed without permanently expanding the hardware buffer. This dynamic approach improves reliability while avoiding the complexity of managing a permanently larger buffer structure.
Solution Approach 2:
The patent changes the parameter of buffer scaling dynamically based on operational conditions. Instead of increasing the physical buffer size, the system changes the scaling parameter by applying bit-shifting operations. This parameter change approach allows the buffer to handle larger values without increasing hardware complexity or buffer management overhead, thus improving reliability without worsening device complexity.
3Measurement precision
If manual rescaling is implemented to prevent overflow, then measurement precision is maintained, but ease of operation decreases
Solution Approach 1:
The patent applies self-service by implementing automatic overflow detection and rescaling mechanisms that operate without manual intervention. The system self-monitors its own buffer status through most significant bit checking and automatically performs right-shifting operations when overflow is detected. This self-service approach maintains measurement precision while eliminating the need for manual buffer management, thus improving ease of operation.
Solution Approach 2:
The patent implements feedback-based automatic rescaling where the system continuously monitors accumulated energy values and automatically adjusts buffer scaling when overflow is detected. This closed-loop feedback mechanism eliminates manual intervention requirements while maintaining precision, resolving the contradiction between measurement precision and ease of operation by making the system self-regulating.
Data Source
AI summary
A mobile device accumulates energy associated with each of successive PSS transmissions received from a base station. Accumulated energy values may be rescaled by a same number of bits whenever a buffer overflow condition occurs within the accumulation buffer. The mobile device may detect a correct PSS timing hypothesis utilizing the rescaled accumulated energy values within the accumulation buffer. A significant bit such as, for example, the most significant bit (MSB) or one of lesser significant bits, of each of the accumulated energy values may be monitored during the energy accumulation process to detect a buffer overflow condition. The mobile device may determine number of bits for rescaling or right shift each of the accumulated energy values in response to the detected buffer overflow condition. The resulting shifted accumulated energy values may be utilized for PSS detection. Either an integrating or filtering method is utilized during the energy accumulation process.