Asynchronous CA Handling via Timing Offset Mapping
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Solution Overview
Problem
In wireless communication networks, especially in 5G NR systems, managing asynchronous multi-carrier operations is challenging due to interference and timing differences between component carriers, which complicates correct mapping of communications and affects performance.
Innovation Solution
User Equipment (UE) detects a multi-carrier operation with multiple asynchronous component carriers, determines the timing offset, and maps communications to appropriate subframes based on this offset, ensuring correct correspondence and efficient communication across asynchronous carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If asynchronous multi-carrier operations are implemented to increase network capacity and bandwidth, then communication throughput is improved, but timing synchronization and interference management become more complex
Solution Approach 1:
The patent segments the multi-carrier system by establishing a reference component carrier (CC) and determining subframe correspondences relative to this reference. Each asynchronous CC is handled independently with its own timing offset measurements, allowing the complex multi-carrier problem to be divided into manageable per-CC segments while maintaining overall system coordination
Solution Approach 2:
The patent performs preliminary timing offset measurements and subframe correspondence determinations before actual data transmission. By pre-establishing the timing relationships and mapping rules for asynchronous CCs, the system prepares the synchronization framework in advance, reducing real-time processing complexity during active communication
2Reliability
If timing offsets between asynchronous component carriers are managed to ensure correct subframe mapping, then communication reliability is improved, but processing overhead and complexity increase
Solution Approach 1:
The UE autonomously performs timing offset measurements and subframe correspondence determinations for asynchronous CCs without requiring extensive network coordination. The device self-manages the complexity of timing synchronization by independently measuring offsets and establishing mappings, reducing network processing overhead while maintaining reliability
Solution Approach 2:
The patent changes the approach from attempting to synchronize all CCs to a common timeline to instead determining subframe correspondences based on measured timing offsets. This parameter change allows the system to work with asynchronous timing relationships directly, maintaining reliability through accurate offset measurement rather than forcing synchronization
3Object-affected harmful factors
If subframe correspondence is determined based on timing offsets to map communications accurately, then interference management is improved, but measurement and detection difficulty increases
Solution Approach 1:
The patent uses downlink timing information as an intermediary to establish subframe correspondences between asynchronous CCs. By measuring timing offsets through downlink signals and using these as a basis for mapping, the system creates an intermediate reference that simplifies interference management while providing a measurable quantity for timing relationships
Data Source
AI summary
Handling of asynchronous multi-carrier is discussed. In new radio (NR) fifth generation (5G) networks, the potential for provision of multi-carrier operations (e.g., carrier aggregation (CA), dual connectivity (DC), etc.) that include asynchronous component carriers (CCs) has been proposed. However, because of the asynchronous relationship network entities, such as base stations and user equipments (UEs) will manage the asynchronous CCs by obtaining timing offset information, either through derivation or direct signaling, and determining a subframe correspondence based on the timing offset relative to a reference CC. By determining the subframe correspondence to the reference CC, the base stations and UEs can accurately map communications over the asynchronous CCs to the appropriate subframes across CCs.