Uplink Synchronization via Delegate Component Carriers
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Solution Overview
Problem
Current wireless communication systems face challenges in establishing effective uplink synchronization, particularly when using multiple Component Carriers (CCs), which affects network efficiency and stability due to varying propagation delays and different transmission delays among user equipment (UEs) and evolved NodeBs (eNBs).
Innovation Solution
A method and apparatus for configuring uplink synchronization in a wireless communication network by selecting delegate CCs based on the state of the UL timing group and characteristics of multiple CCs, allowing for the transmission and reception of synchronization information to establish and maintain synchronization between UE and eNB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple Component Carriers (CCs) are used to increase network capacity and satisfy user demand, then network efficiency and data transmission capability are improved, but synchronization complexity and difficulty of establishing uplink synchronization increase
Solution Approach 1:
The patent divides multiple Component Carriers into distinct groups, with each group having a designated delegate CC for synchronization purposes. This segmentation allows the system to manage synchronization independently for each group rather than treating all CCs as a single complex entity, thereby reducing overall synchronization complexity while maintaining the benefits of multiple CCs for network efficiency
Solution Approach 2:
The patent introduces delegate CCs as intermediary elements that act as representatives for groups of CCs. These delegate CCs receive and process synchronization information, which is then applied to maintain synchronization across all CCs in the group. This intermediary mechanism simplifies the synchronization process by reducing the number of direct synchronization operations needed among multiple CCs
2Reliability
If synchronization information is transmitted through multiple CCs to ensure comprehensive coverage, then reliability of synchronization establishment is improved, but transmission delays and processing time increase
Solution Approach 1:
The patent extracts the synchronization function from all CCs and concentrates it in selected delegate CCs within each group. By taking out the synchronization responsibility from every CC and assigning it only to specific delegate CCs, the system maintains reliable synchronization coverage while significantly reducing the time required for synchronization information transmission and processing across the multiple CCs
3Measurement precision
If delegate CCs are selected based on UL timing group state and CC characteristics to optimize synchronization, then accuracy of synchronization is improved, but selection complexity and processing overhead increase
Solution Approach 1:
The patent applies local quality by selecting delegate CCs based on specific characteristics of each CC and the state of each UL timing group. Rather than using a uniform selection criterion for all CCs, the system evaluates local conditions such as timing group state and CC-specific characteristics to determine the most suitable delegate CC for each group, thereby optimizing synchronization accuracy for each local context
Solution Approach 2:
The patent utilizes parameter changes in the selection process by considering variations in UL timing group states and CC characteristics. The selection of delegate CCs is dynamically adjusted based on changes in these parameters, allowing the system to adapt to different operational conditions and maintain high synchronization accuracy while managing selection complexity through structured parameter evaluation
Data Source
AI summary
Uplink synchronization establishment in a base station which operates a plurality of component carriers according to one embodiment of the present description, is performed in that the base station is connected to a user equipment, sets component carrier aggregation information, generates an uplink timing groups in the set component carrier aggregation, and transmits information on the thus-generated uplink timing groups to the user equipment.