NodeB MIMO Mode Switching via NBAP Signaling
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Solution Overview
Problem
The challenge is that after a NodeB self-adaptively adjusts the MIMO mode of a cell, the Control RNC (CRNC) cannot accurately determine the current MIMO mode status, leading to inconsistent use of MIMO resources and disrupted communication.
Innovation Solution
A method and system where the NodeB sends a message to the RNC through the NBAP layer of the lub port, carrying the cell identifier and MIMO mode status information, allowing the RNC to update and manage the MIMO mode status, ensuring accurate determination and reconfiguration of radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the NodeB self-adaptively adjusts the MIMO mode to save energy, then energy consumption is reduced, but the CRNC cannot accurately determine the current MIMO mode status
Solution Approach 1:
The NodeB feeds back MIMO mode status information to the CRNC through NBAP signaling. When the NodeB self-adaptively switches between MIMO and non-MIMO modes, it sends notifications to the CRNC containing the cell identifier and current MIMO mode status, enabling the CRNC to maintain accurate knowledge of the operational state without preventing energy-saving operations
Solution Approach 2:
The NBAP signaling layer acts as an intermediary mechanism between the NodeB and CRNC. The signaling message serves as a mediator that carries MIMO mode status information from the NodeB to the CRNC, resolving the information asymmetry problem while allowing the NodeB to independently perform energy-saving operations
2Loss of energy
If the NodeB self-adaptively switches MIMO mode, then energy-saving operations are enabled, but inconsistent use of MIMO resources occurs
Solution Approach 1:
The NodeB provides real-time feedback of MIMO mode status to the CRNC through NBAP signaling. This feedback mechanism ensures that the CRNC has accurate, up-to-date information about the actual MIMO operational state, allowing it to maintain consistent resource allocation and management decisions
Solution Approach 2:
The NodeB autonomously performs MIMO mode switching based on local conditions (traffic load, channel quality) and self-manages the information synchronization with the CRNC. This self-service approach enables the NodeB to optimize energy consumption locally while maintaining overall system consistency through automated signaling
3Loss of energy
If the NodeB control MIMO mode switching autonomously, then energy consumption is reduced, but UE fails to demodulate downlink data
Solution Approach 1:
The CRNC receives MIMO mode status feedback from the NodeB and uses this information to make informed radio resource management decisions. The CRNC can reconfigure UE radio resources appropriately based on the actual MIMO mode, ensuring that UEs are correctly configured for data demodulation regardless of the NodeB's autonomous mode changes
Solution Approach 2:
The CRNC proactively reconfigures UE radio resources based on the MIMO mode status information received from the NodeB. By performing preliminary resource configuration adjustments, the system ensures that UEs are prepared for the current MIMO mode before data transmission occurs, preventing demodulation failures
Data Source
AI summary
A switching method and system for a Multiple Input Multiple Output (MIMO) mode are provided by the disclosure. The method comprises that: a NodeB determines to perform MIMO mode switching for a cell (S302); through a NodeB Application Part (NBAP) layer of an lub port, the NodeB sends a message which carries the cell identifier of the cell and the MIMO mode status information of the cell (S304) to a Radio Network Controller (RNC); the RNC updates the MIMO mode status of the cell by using the cell identifier and the MIMO mode status information (S306). The disclosure ensures normal communication between a piece of User Equipment (UE) and a NodeB.