Inter-Node B Handover Frequency Point Allocation
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Solution Overview
Problem
In multi-carrier LTE-A systems, user equipment faces challenges in determining the correct component carrier for random access during inter-Node B handover, leading to resource wastage and conflicts due to the lack of specific frequency point information for multiple uplink and downlink frequency points.
Innovation Solution
The proposed inter-Node B handover method involves the target eNB sending handover reference frequency point information, including center frequency points for uplink and downlink component carriers, within the Handover Request Acknowledge message to the user equipment, ensuring accurate random access resource allocation and reducing conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the target eNB sends all uplink and downlink frequency point information to the user equipment, then the user equipment can access all component carriers, but the user equipment cannot determine which frequency point to use for random access, causing resource waste and conflicts
Solution Approach 1:
The patent extracts the essential random access frequency point information from the complete set of uplink and downlink frequency point information. Instead of transmitting all frequency points, the target eNB identifies and sends only the specific uplink frequency point needed for random access and the corresponding downlink frequency point for receiving the random access response, thereby resolving the contradiction between providing comprehensive access capability and enabling clear operation.
Solution Approach 2:
The patent introduces an intermediary mechanism where the target eNB acts as a mediator that processes the complete frequency point information and selects the appropriate random access frequency points. This intermediary function resolves the contradiction by transforming the comprehensive frequency information into actionable random access parameters that the user equipment can clearly operate with.
2Loss of information
If default frequency point information is used for all component carriers, then the signaling overhead is reduced, but the handover accuracy and resource allocation precision deteriorate
Solution Approach 1:
The patent applies local quality by providing specific, accurate frequency point information only where needed for random access, rather than using default information universally. The target eNB identifies the particular uplink and downlink frequency points that correspond to each other for random access purposes, providing precise local information rather than generic default values, thereby improving handover accuracy without excessive signaling overhead.
3Adaptability or versatility
If multiple random access resources are provided on all frequency points, then the user equipment has more access options, but resource waste and conflicts increase due to inability to determine the correct frequency point
Solution Approach 1:
The patent extracts and transmits only the specific uplink frequency point information needed for random access from the complete set of available frequency points. By identifying and sending only the relevant frequency point(s) for random access rather than all available frequency points, the system maintains appropriate access options while eliminating resource waste and conflicts that would result from providing excessive frequency point information.
Data Source
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AI summary
The present invention discloses an inter-Node B handover method, wherein a target eNB sends a Handover Request Acknowledge message including handover reference frequency point information through a source eNB to a user equipment, wherein the handover reference frequency point information includes center frequency point information of an uplink component carrier designated for the user equipment to initiate a random access request. Further, the present invention discloses another inter-Node B handover method, wherein a target eNB orderly arrays center frequency point information of uplink component carriers of a target cell to obtain a first list, the target eNB sends a Handover Request Acknowledge message including the first list through a source eNB to a user equipment, and the user equipment requests a random access according to the center frequency point information of a first uplink component carrier. Through the solution of the present invention, the usage rate of the random access resources for the target eNB can be improved effectively and the conflict of random accesses can be reduced.