Wireless Handover Timing Adjustment for Carrier Aggregation
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Solution Overview
Problem
In radio communication systems involving carrier aggregation, the handover procedure faces challenges with service quality degradation due to random access delays and overhead, particularly in LTE-A networks, where multiple component carriers can lead to signal collisions and increased overhead during the handover process.
Innovation Solution
A method is introduced where a mobile station and base station coordinate by transmitting an access request message via a first communication resource, receiving a timing adjustment, and adjusting access timing for a second communication resource, allowing for efficient communication across multiple component carriers while minimizing random access failures and overhead by skipping random access for carriers in close proximity, thereby optimizing handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random access is performed for each component carrier during handover, then connection establishment is achieved, but service quality degrades due to signal collisions and increased overhead
Solution Approach 1:
The patent extracts the random access procedure from the handover process for component carriers that are not essential for initial connection establishment. Specifically, when a component carrier is configured with uplink synchronization, the UE skips the random access procedure for that carrier, thereby eliminating the harmful effects of signal collisions and overhead while maintaining connection establishment reliability through selective application of random access only where necessary.
2Object-generated harmful factors
If handover procedure is simplified by skipping random access, then overhead is reduced, but connection reliability may be compromised
Solution Approach 1:
The patent applies local quality by differentiating the handover procedure based on the specific characteristics of each component carrier. The UE determines whether to perform random access on a per-carrier basis according to the uplink synchronization configuration. For carriers requiring uplink synchronization, random access is performed; for carriers where it is not required, random access is skipped. This localized approach ensures connection reliability is maintained where needed while overhead is reduced where possible.
Data Source
AI summary
A mobile station in a wireless communication network. The mobile station includes a radio communication that transmits an access request message to a base station via a first communication resource, and receives a timing adjustment in response to the access request message from the base station. The mobile station also includes an adjustment value storage unit that stores the timing adjustment, and a control unit that adjusts access timing corresponding to a second communication resource based on the timing adjustment value stored in the adjustment value storage unit. The radio communication unit then communicates with the base station via the first communication resource and the second communication resource.