LTE TDD WiMAX Synchronization Frame Timing
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Solution Overview
Problem
There is a need for synchronization between LTE TDD and WiMAX systems to enable smooth evolution from WiMAX to LTE TDD networks and to avoid mutual interference, while ensuring the performance of both systems is maintained.
Innovation Solution
The method involves setting a later starting time for the LTE TDD frame, adopting a subframe ratio structure of subframe configuration 1, and knocking off the UpPTS time slot and the last uplink symbol of the last uplink subframe, allowing synchronization without affecting the WiMAX system's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE TDD and WiMAX systems operate simultaneously with overlapping frequency bands, then network evolution and resource sharing are enabled, but mutual interference between systems occurs
Solution Approach 1:
The patent applies preliminary action by pre-configuring different frame structures and time slot arrangements for LTE TDD and WiMAX systems before operation. The LTE TDD frame structure is designed with specific uplink-downlink configurations, and WiMAX frames are structured with predetermined subframe allocations. This advance planning allows the systems to coexist without interference while enabling smooth network evolution from WiMAX to LTE TDD.
2Ease of manufacture
If a dual-mode base station shares radio frequency units and antennas between WiMAX and LTE TDD, then cost is reduced, but air-interface synchronization becomes necessary
Solution Approach 1:
The patent applies segmentation by dividing the frame structure into distinct segments for different systems. LTE TDD uses specific subframe configurations (e.g., configuration 0-6) with defined uplink and downlink periods, while WiMAX uses its own frame structure with specific subframe allocations. By segmenting the time-frequency resources in this manner, the patent enables dual-mode operation with shared hardware while maintaining air-interface synchronization, thus reducing base station cost without excessive complexity.
3Reliability
If LTE TDD frame starting time is set later than WiMAX frame starting time, then synchronization is achieved, but LTE TDD uplink resources are reduced
Solution Approach 1:
The patent applies dynamics by making the frame structure configurable and adaptable. The LTE TDD system can dynamically adjust its uplink-downlink configuration based on the WiMAX frame structure and traffic requirements. Different uplink-downlink configurations (0-6) can be selected to optimize the balance between synchronization reliability and uplink throughput. This dynamic adjustment allows the system to maintain synchronization while adapting uplink resources to actual needs.
Data Source
AI summary
The present invention provides a method and a device for implementing synchronization between different systems. The method includes setting a starting time of an LTE TDD frame, where the starting time set for the LTE TDD frame is later than a starting time set for a WiMAX frame. The LTE TDD frame is transmitted after the starting time of the LTE TDD frame arrives. The WiMAX frame adopts a subframe ratio structure of 29:18, the LTE TDD frame adopts a subframe ratio structure of subframe configuration 1, and an UpPTS time slot and a last uplink symbol of a last uplink subframe which are in the LTE TDD frame are in a status of being knocked off.