Dynamic Ncs Parameter Configuration for LTE Synchronization
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Solution Overview
Problem
In wireless communication systems, optimizing the ZeroCorrelationZoneConfig (Ncs) parameter and logical root sequence assignments is challenging due to the need for minimizing root sequences to increase reuse distance, while ensuring sufficient orthogonality and synchronization between mobile devices and base stations, especially in LTE environments where timing synchronization failures can occur.
Innovation Solution
A method and apparatus for dynamically configuring the Ncs parameter based on real-time measurements of timing synchronization failures, allowing base stations to adjust their root sequences and cyclic shifts to optimize communication, thereby improving synchronization and reducing failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of root sequences is minimized to increase reuse distance, then the coverage area and network capacity are improved, but the orthogonality between preambles deteriorates leading to increased timing synchronization failures
Solution Approach 1:
The patent implements dynamic adjustment of the Ncs parameter based on real-time measurement of timing synchronization failure counts. When failures exceed a threshold, the base station modifies the Ncs parameter to increase orthogonality, and when failures are below the threshold, it reduces Ncs to maintain larger reuse distance. This dynamic adaptation resolves the contradiction by allowing the system to optimize between coverage area and synchronization reliability based on actual network conditions.
Solution Approach 2:
The patent changes the Ncs parameter value dynamically based on timing synchronization failure measurements. By adjusting this critical parameter that controls cyclic shift length, the system can increase or decrease orthogonality between preambles derived from the same root sequence, thereby resolving the trade-off between maintaining sufficient orthogonality for reliable synchronization and minimizing root sequences for larger reuse distance and coverage.
2Reliability
If the Ncs parameter is increased to improve orthogonality between preambles, then timing synchronization reliability is improved, but the number of usable root sequences decreases reducing reuse distance
Solution Approach 1:
The system dynamically adjusts the Ncs parameter based on measured timing synchronization failure counts. When failures exceed a threshold, Ncs is increased to improve orthogonality and synchronization reliability. When failures are below the threshold, Ncs is reduced to allow more root sequences to be used, thereby increasing reuse distance. This dynamic behavior resolves the contradiction by adapting to actual network conditions.
Solution Approach 2:
The patent implements a feedback mechanism where the base station measures the count of timing synchronization failures and uses this measurement to adjust the Ncs parameter. The failure count serves as feedback about the current orthogonality sufficiency, allowing the system to increase Ncs when orthogonality is insufficient (high failures) and decrease Ncs when orthogonality is sufficient (low failures), thereby balancing synchronization reliability with reuse distance.
3Device complexity
If static configuration of Ncs parameter is used to simplify network planning, then device complexity is reduced, but adaptability to different cell sizes and traffic conditions deteriorates
Solution Approach 1:
The patent implements self-service through Self-Optimizing Network (SON) features that automatically measure timing synchronization failures and adjust the Ncs parameter without manual intervention. The base station autonomously monitors synchronization failure counts, compares them against thresholds, and modifies the Ncs parameter accordingly. This self-adjusting mechanism eliminates the need for complex manual network planning while providing adaptability to different cell sizes and traffic conditions.
Solution Approach 2:
The system transitions from static Ncs configuration to dynamic adjustment based on real-time measurements. The Ncs parameter automatically adapts to different cell sizes, traffic loads, and synchronization conditions without requiring manual reconfiguration. This dynamic approach maintains simplicity for operators while providing versatile adaptation to varying network conditions.
Data Source
AI summary
A method for configuring a ZeroCorrelationZoneConfig (Ncs) parameter of a base station is provided. The method comprises determining a count of timing synchronization failures between a mobile device and the base station. The method comprises upon determining that the count of timing synchronization failures satisfies a threshold, dynamically configuring an Ncs parameter. The method further comprises detecting an occurrence of a timing synchronization failure. The detecting the occurrence of the timing synchronization failure comprises receiving a first message comprising a preamble, generating a preamble identification (ID) for the received preamble, transmitting a second message comprising the preamble ID, and upon transmission of the second message, detecting a non-receipt of a third message.