Radio Station Baseband Processing Allocation
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Solution Overview
Problem
The separated structure of radio base stations, where digital signal processing is performed at the radio equipment controller (REC) and analog RF signal processing at the radio equipment (RE), leads to traffic congestion due to increased data redundancy and challenges in cooperative control among REs, particularly in implementing techniques like CoMP, which require centralized radio resource control.
Innovation Solution
A radio station configuration that allows dynamic allocation of baseband signal processing between the REC and RE, enabling either unit to perform digital signal processing, with the option to select which unit processes user data based on traffic, power consumption, and cooperative control needs, thereby reducing traffic congestion and facilitating cooperative control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signal processing is performed at the REC in a separated structure, then centralized control and monitoring are improved, but traffic congestion occurs between REC and RE due to increased data redundancy
Solution Approach 1:
The patent segments the baseband signal processing function between REC and RE, allowing RE to perform digital signal processing locally. This divides the processing workload and reduces the volume of data that needs to be transmitted between REC and RE, thereby reducing traffic congestion while maintaining centralized control through the REC.
Solution Approach 2:
The patent introduces an intermediary interface between REC and RE that enables selective data transmission. This intermediary mechanism allows the system to choose whether to transmit processed data or control commands, reducing unnecessary data traffic while maintaining necessary control functionality.
2Quantity of substance
If baseband signal processing is performed at RE, then traffic congestion is reduced, but cooperative control among REs becomes difficult to implement
Solution Approach 1:
The patent makes the RE multi-functional by enabling it to perform both analog RF signal processing and digital baseband signal processing. This universality allows RE to independently process signals locally (reducing traffic) while also being capable of participating in cooperative control operations when needed, thus resolving the contradiction between traffic reduction and cooperative control capability.
3Adaptability or versatility
If separated structure is used, then flexibility in dealing with function increase is improved, but traffic congestion occurs due to channel coding and spreading redundancy
Solution Approach 1:
The patent segments the signal processing functions by implementing baseband processing at the RE level. This allows the system to maintain functional flexibility through the separated architecture while reducing the data amount transmitted between REC and RE by performing redundancy-generating operations (channel coding, spreading) locally at the RE rather than transmitting the full processed data.
Data Source
AI summary
A radio station (1) includes a first part (1A) and a second part (1B). The second part (1B) can be arranged so as to be physically separated from the first part (1A) and is connected to the first part (1A) via a transmission line (40) so as to be able to communicate with the first part. Each of the first part (1A) and the second part (1B) includes a digital signal processing unit (11A, 11B) and is capable of alternatively performing digital signal processing for user data. An analog signal processing unit (13) arranged in the second part performs analog signal processing including at least one of frequency conversion and power amplification to provide an air interface to a mobile station.