Reverse Handover for Wireless Energy Saving
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing handover operations between cells to conserve energy while maintaining user equipment mobility, as quick handovers can be delayed by the time required for signal measurements, potentially compromising energy savings opportunities.
Innovation Solution
Implementing a reverse handover operation mechanism where user equipment is first handed over from a source cell to a first target cell and then, upon specific conditions, to a second target cell, allowing for coordinated energy-saving network operations without compromising mobility, through coordinated efforts between network nodes and user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional handover operations are used, then user equipment mobility is maintained, but energy-saving opportunities are lost due to delayed handovers caused by signal measurement time
Solution Approach 1:
The patent performs preliminary actions by having the UE measure and report signal parameters (RSRP, RSRQ, SINR) of target cells before the actual handover is triggered. The source gNB prepares handover commands in advance based on these pre-collected measurements, so when energy-saving handover is needed, the decision can be made immediately without waiting for real-time measurements, thus resolving the contradiction between energy saving and handover speed.
2Loss of energy
If handover decisions are delayed to conserve energy, then energy-saving opportunities increase, but user equipment mobility responsiveness deteriorates
Solution Approach 1:
Signal measurements and evaluations are performed in advance and stored in the UE and/or network. When energy-saving handover is required, the pre-computed measurement results are immediately utilized to make rapid handover decisions, eliminating the need for time-consuming real-time measurements and thus achieving both energy savings and fast response.
Solution Approach 2:
The patent changes the operational parameters by using pre-measured signal quality parameters (RSRP, RSRQ, SINR) instead of performing new measurements at the moment of handover decision. This parameter substitution allows the network to make informed handover decisions quickly without the energy cost of real-time measurements, resolving the contradiction between energy consumption and decision speed.
3Ease of operation
If frequent handover operations are performed, then user equipment mobility is well-supported, but network energy consumption increases
Solution Approach 1:
The patent applies partial action by performing signal measurements and evaluations only when necessary (when energy-saving handover is required) rather than continuously. The pre-measured parameters are utilized to make handover decisions without triggering full measurement procedures, thus reducing overall energy consumption while maintaining adequate mobility support.
Solution Approach 2:
The patent changes the measurement triggering parameters by using stored pre-measured signal quality data (RSRP, RSRQ, SINR) instead of initiating new measurement cycles for every handover consideration. This parameter reuse significantly reduces the energy consumption associated with frequent handover operations while maintaining mobility responsiveness.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may obtain, from a first network node via a source cell, a reverse handover command associated with a second handover operation for handing over the UE from a first target cell to a second target cell. The UE may perform a first handover operation to hand over the UE from the source cell to the first target cell. The UE may perform the second handover operation to hand over the UE from the first target cell to the second target cell. Numerous other aspects are described.