Cell-Specific A-MPR Exchange for Seamless Handover
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Solution Overview
Problem
In wireless telecommunication systems, user equipment (UE) may fail to meet out-of-band emission requirements during handovers due to lack of access to cell-specific Additional Maximum Power Reduction (A-MPR) values for the target cell, leading to potential interference and complexity in system information reading.
Innovation Solution
Exchanging cell-specific A-MPR-related information between network nodes allows the serving cell to provide the necessary A-MPR value to the UE before handover, ensuring compliance with out-of-band requirements without excessive power reduction and reducing unnecessary emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE reads system information from the target cell during handover, then the UE can obtain A-MPR values, but this increases UE complexity and causes unnecessary delays
Solution Approach 1:
The A-MPR value is determined and prepared in advance by the network (either stored in the serving cell or provided by the target cell before handover). The serving cell then includes this pre-determined A-MPR value in the handover command message sent to the UE. This eliminates the need for the UE to read system information from the target cell after handover, as the UE already has the required A-MPR value from the handover command.
2Reliability
If the UE applies excessive power reduction to meet out-of-band requirements, then regulatory requirements are satisfied, but transmission power is reduced unnecessarily
Solution Approach 1:
The patent introduces a cell-specific A-MPR parameter that can take different values (e.g., 0 dB, 3 dB, 6 dB, or other values) depending on the specific cell's characteristics and regulatory requirements. Instead of using a fixed or excessive power reduction, the network configures the appropriate A-MPR value for each cell, allowing the UE to apply the precise amount of power reduction needed to meet out-of-band requirements without unnecessary loss of transmission power.
3Adaptability or versatility
If different eNodeBs operate on different bandwidths, then network flexibility is improved, but A-MPR requirements vary between cells increasing complexity
Solution Approach 1:
The patent implements cell-specific A-MPR values that are tailored to each individual cell's characteristics, including its bandwidth, frequency band, and regulatory environment. Each eNodeB can operate on different bandwidths (1.4, 3, 5, 10, 15, or 20 MHz) without requiring the UE to manage complex variable parameters, because the appropriate A-MPR value is locally configured for each cell and provided to the UE through the handover command.
Data Source
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AI summary
The present invention relates to exchanging a cell-specific parameter such as the A-MPR, comprising information related to a required additional maximum power reduction of a UE transmitter between networks nodes. The networks nodes may be radio base stations or other network nodes such as radio network controllers or core network nodes exemplified by access gateways (aGWs). By exchanging this cell-specific parameter with information of the required additional maximum power reduction between the network nodes, the cell-specific parameter is provided to the radio base station of the serving cell which implies that the serving cell can send the cell-specific parameter of the target cell to the UE prior to the handover from the serving cell to the target cell. This result in that the UE can start transmission to the target cell with the correct cell-specific parameter and the out-of-band emission requirements can be fulfilled in the target cell.