Synchronizing BBU and RRU Carrier States for Energy Savings
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Solution Overview
Problem
In current Software Defined Radio (SDR) base stations, the Base Station Controller (BSC) cannot consistently control the on-off states of carriers in Radio Remote Units (RRUs), leading to inefficiencies in energy saving and consumption reduction due to a lack of synchronization between the BSC and RRU carrier states.
Innovation Solution
The method involves RRUs reporting their on-off states to a Base Band Unit (BBU), which collects and relays this information to the BSC, allowing the BSC to re-determine and synchronize the on-off states of logic carriers, and the BBU converts these states back to physical carrier controls for the RRU, ensuring consistent carrier management through regular reporting and reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the BBU and RRU are independent and the binding relationship is determined by proximal operation maintenance network management configuration, then the system achieves modular flexibility and independent operation, but the BSC cannot synchronize with RRU carrier on-off states leading to control inconsistency
Solution Approach 1:
The patent implements a feedback mechanism where the RRU periodically reports its carrier on-off states to the BBU, which then synchronizes this information with the BSC. This closed-loop feedback ensures that the BSC always has accurate, real-time information about the actual carrier states in the RRU, resolving the synchronization issue while preserving the modular independent architecture.
Solution Approach 2:
The BBU serves as an intermediary between the RRU and the BSC. It receives carrier state information from the RRU, processes and maps this information according to the logic-physical carrier relationships, and then provides synchronized control information to the BSC. This intermediary role enables consistent control across the distributed system without requiring direct BSC-RRU connectivity.
2Device complexity
If the BSC controls logic carrier frequencies based on configuration without real-time state information, then the control process is simple, but energy saving objectives cannot be achieved when carrier states change
Solution Approach 1:
The patent introduces periodic feedback from the RRU to the BBU about actual carrier on-off states. The BBU then uses this feedback information to update the BSC's view of carrier states. This enables the BSC to make accurate control decisions based on real-time conditions, achieving energy saving objectives while maintaining relatively simple control logic at each node.
Solution Approach 2:
The system performs preliminary actions by having the RRU report its carrier states periodically to the BBU in advance of any control decisions. This allows the BSC to be prepared with accurate state information before needing to make control decisions, enabling timely and accurate carrier on-off control for energy saving.
3Ease of operation
If the RRU does not know which logic carrier frequency corresponds to each physical carrier, then the RRU operation is simplified, but the BSC cannot accurately control carrier on-off states
Solution Approach 1:
The BBU acts as an intermediary that handles the complex mapping between logic and physical carrier frequencies. The RRU simply reports its physical carrier states to the BBU without needing to understand the logic-physical mapping. The BBU then translates this information into the appropriate logic carrier context for the BSC, preserving the simplicity of RRU operation while providing accurate correspondence information to the BSC.
Solution Approach 2:
The RRU periodically feedbacks its physical carrier on-off states to the BBU, which then uses this information to maintain accurate mapping knowledge with the BSC. This feedback mechanism ensures that the BSC always has the correct correspondence information between logic and physical carriers without requiring the RRU to store or process this mapping information.
Data Source
AI summary
The present disclosure provides a method and system for realizing a carrier control. The method includes: a BBU obtains and collects on-off state information of corresponding logic carriers of all configured cells and logic physical relationships of carrier frequencies according to on-off states of physical carriers reported by RRUs and reports them to a Base Station Controller (BSC); the BSC re-determines the on-off states of the logic carriers and returns them to the BBU; and the BBU converts the obtained on-off states of the logic carriers into on-off states of the physical carriers and transmits them to corresponding RRUs, and the RRUs perform carrier controls according to the obtained on-off states of the physical carriers. By the method of the present disclosure, the BSC ensures itself to be consistent with the on-off states of the carriers of the RRU by effectively controlling the on-off states of the RRU through the BBU, so that carriers are well controlled and the target of saving energy and reducing consumption is better achieved.