Pre-start-up Procedure for Distributed Radio Base Station Internal Interface
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Solution Overview
Problem
The existing standardized start-up procedure for radio base stations, such as the Common Public Radio Interface (CPRI), is inefficient due to its lengthy process when multiple line bit rates are involved, potential hanging issues during negotiation, and stringent hardware requirements for quick line bit rate changes.
Innovation Solution
A pre-start-up procedure that stores proven combinations of line bit rate and protocol, initiates the start-up procedure with a temporary available set, and classifies subsets for efficient processing, allowing for a best combination negotiation and quick restarts if necessary, thereby simplifying hardware design and expediting processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the standardized start-up procedure is used to synchronize physical layer and align line bit rate and protocol, then the interface can be established, but the process becomes lengthy and inefficient when multiple line bit rates are involved
Solution Approach 1:
The patent applies preliminary action by performing capability exchange and negotiation before the actual start-up procedure. The radio equipment controller and radio equipment exchange their supported line bit rates and protocols in advance, store this information in available sets, and use it to guide the start-up process. This pre-preparation eliminates the need to test all possible combinations during start-up, significantly reducing the time required for synchronization and alignment while maintaining reliable interface establishment.
2Reliability
If the start-up procedure tries different configurations to find a match, then compatibility is achieved, but the process may hang during negotiation
Solution Approach 1:
The patent performs capability exchange and stores the results in available sets before the start-up procedure begins. Both the radio equipment controller and radio equipment pre-determine their supported line bit rates and protocols, eliminating the need for lengthy trial-and-error negotiation during start-up. This pre-computed approach ensures compatibility is achieved quickly without hanging.
Solution Approach 2:
The patent implements feedback mechanisms where the radio equipment controller and radio equipment continuously exchange capability information and negotiation status during the start-up process. This feedback loop allows both sides to adjust their available sets based on the other's capabilities, ensuring efficient convergence on a compatible configuration without indefinite negotiation delays.
3Speed
If the hardware is designed to support quick line bit rate changes, then the start-up process becomes faster, but the hardware design becomes more complex and stringent
Solution Approach 1:
The patent applies preliminary action by pre-determining and storing available line bit rates and protocols in the radio equipment controller and radio equipment before start-up. This eliminates the need for complex real-time hardware switching during the start-up process. The hardware can use simpler, pre-configured paths since the line bit rate selection is made in advance through software-based capability exchange and negotiation, reducing hardware complexity while maintaining fast operation.
Data Source
AI summary
A radio base station (20) has an internal interface (26) connecting a radio equipment (RE) (24) and a radio equipment controller (REC) (22). The radio base station performs a pre-start-up procedure or method for the internal (26). The pre-start-up procedure is performed preparatory to and/or in conjunction with a start-up procedure for the internal interface. As on e of its aspects, the pre-start-up procedure involves storing one or more previously proven combinations of line bit rate and protocol as stored combination(s) for use on the internal interface. Prior to synchronization of the internal interface, the stored combination(s) are retrieved and included in a temporary available set of combinations of line bit rate and protocol. Thereafter the start-up procedure for the internal interface is initiated for the purpose of determining efficacy of the temporary available set. Should synchronization of the physical layer by the start-up procedure succeed, the pre-start-up procedure uses a valid combination of line bit rate and protocol in the available set for negotiating between the radio equipment controller (REC) and the radio equipment (RE). Should the start-up procedure fail, the pre-start-up procedure removes a failed combination of line bit rate and protocol from the set.