WCDMA GSM Base Station CPRI IQ Data Mapping
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Solution Overview
Problem
Existing methods for achieving compatibility between the WCDMA and GSM systems lack genuine unification of radio transmission modes at the bottom layer, as they primarily switch between codes without integration, leading to inefficiencies in dual-mode base stations.
Innovation Solution
A method and apparatus that map and multiplex In-phase/Quadrature (IQ) data of the GSM system to the Common Public Radio Interface (CPRI) according to a predetermined rate, enabling unified radio transmission modes by interleaving and framing in the downlink path and de-multiplexing and de-mapping in the uplink path, ensuring synchronized transmission across both systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If code switching methods are used to achieve compatibility between WCDMA and GSM systems, then system compatibility is improved, but genuine unification at the bottom layer is not achieved and transmission efficiency deteriorates
Solution Approach 1:
The patent segments the IQ data stream into WCDMA data and GSM data portions, processes them separately through dedicated mapping and demapping units, and then recombines them. This segmentation allows each system's data to be handled with its specific requirements while maintaining overall system unity, resolving the contradiction between compatibility and efficiency.
Solution Approach 2:
The patent introduces an intermediary unified frame structure that mediates between WCDMA and GSM systems. This intermediate structure includes synchronization fields, data fields for both systems, and overhead fields, allowing seamless integration and transmission of both systems' data without direct conflict, thus achieving both compatibility and efficiency.
2Adaptability or versatility
If separate processing of WCDMA and GSM data is maintained, then system-specific requirements are met, but device complexity increases
Solution Approach 1:
The patent merges the processing of WCDMA and GSM data into a single unified transmission framework. Both systems' IQ data are mapped into the same frame structure and transmitted through the same physical interface, reducing the need for separate processing paths and lowering overall device complexity while maintaining system-specific capabilities.
Solution Approach 2:
The patent creates a universal frame structure that can accommodate both WCDMA and GSM data simultaneously. This multi-functional structure includes fields that can carry either WCDMA or GSM data depending on the transmission mode, allowing the system to handle multiple standards through a single processing architecture, thereby reducing complexity.
3Adaptability or versatility
If unified frame structure is implemented for both systems, then bottom layer unification is achieved, but data rate synchronization becomes more challenging
Solution Approach 1:
The patent applies preliminary action by pre-mapping GSM IQ data to the unified frame structure at a predetermined rate before multiplexing with WCDMA data. This advance mapping and the use of predetermined mapping rates simplify the synchronization process by establishing a fixed framework in advance, reducing the complexity of real-time data rate coordination.
Data Source
AI summary
The present invention provides a method for realizing compatibility between a WCDMA system and a GSM system, including: in the downlink data path of a base station, In-phase/Quadrature (IQ) data of the GSM system are mapped to the Common Public Radio Interface (CPRI) according to a predetermined rate before IQ data interleaving and framing the CPRI Base Frame (BF), and then the mapped data of the GSM system are de-multiplexed with IQ data of the WCDMA system; in the uplink data path of the base station, IQ data in the CPRI are de-multiplexed after de-framing and IQ data de-interleaving CPRI BFs, and then the de-multiplexed IQ data of the GSM system are de-mapped according to the predetermined rate. The present invention further provides an apparatus for realizing compatibility between a WCDMA system and a GSM system. The method and apparatus genuinely realize the compatibility between the WCDMA system and the GSM system by unifying two different radio transmission modes between the WCDMA system and the GSM system in the bottom layer.