LTE Handover Signaling With Preplanned Timing And Resource Assignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LTE handover procedures lack details on handover command configurations, UE operations post-handover, UE timing adjustments, and efficient resource scheduling, leading to potential handover failures.
Innovation Solution
A method and system for LTE handover that includes detailed signaling and operations at the WTRU and eNode-Bs, with enhanced handover commands containing reconfiguration information, timing adjustments, and resource scheduling, along with mechanisms for handling handover failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detailed handover command configurations and resource scheduling are implemented, then handover reliability is improved, but device complexity increases
Solution Approach 1:
The handover command is segmented into multiple information elements including reconfiguration information, timing adjustment parameters, and resource scheduling details. This segmentation allows comprehensive handover control while organizing complexity into manageable components that can be processed systematically by the WTRU and eNode-B
Solution Approach 2:
The source eNode-B performs preliminary actions by preparing the handover command with all necessary reconfiguration information, timing adjustments, and resource scheduling decisions before the actual handover execution. This preliminary preparation ensures that the target eNode-B and WTRU receive complete instructions, reducing handover failures without requiring complex real-time decision-making during the transition
2Speed
If comprehensive timing adjustments and resource management are provided, then handover speed is improved, but device complexity increases
Solution Approach 1:
Timing adjustment parameters and resource scheduling information are prepared in advance by the source eNode-B and included in the handover command. The WTRU receives these pre-calculated parameters and applies them directly during handover execution, enabling rapid timing synchronization and resource allocation without complex real-time computations
Solution Approach 2:
The handover command includes self-contained timing adjustment parameters and resource scheduling information that enable the WTRU to autonomously configure its transmission and reception timing, and allocate resources, without requiring continuous network intervention. This self-service capability accelerates handover while reducing signaling overhead
Data Source
AI summary
A method and system for performing handover in a third generation (3G) long term evolution (LTE) system are disclosed. A source evolved Node-B (eNode-B) makes a handover decision based on measurements and sends a handover request to a target eNode-B. The target eNode-B sends a handover response to the source eNode-B indicating that a handover should commence. The source eNode-B then sends a handover command to a wireless transmit/receive unit (WTRU). The handover command includes at least one of reconfiguration information, information regarding timing adjustment, relative timing difference between the source eNode-B and the target eNode-B, information regarding an initial scheduling procedure at the target eNode-B, and measurement information for the target eNode-B. The WTRU then accesses the target eNode-B and exchanges layer 1/2 signaling to perform downlink synchronization, timing adjustment, and uplink and downlink resource assignment based on information included in the handover command.