Dynamic Radio Signal Coordination in Distributed Antenna Systems
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Solution Overview
Problem
Current distributed antenna systems (DAS) face challenges such as sensitivity-limited uplink signal-to-noise ratio (SNR) due to noise contributions from remote radio units, interference from inactive units, and inefficient dynamic coordination of uplink/downlink signals, leading to reduced capacity and quality of experience, especially in crowded areas.
Innovation Solution
A system that dynamically coordinates radio signals by using a distributing and combining unit to route signals based on performance indicators measured by a measurement unit, generating output parameters through a decision process to optimize network performance and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If all remote radio units transmit the same signal, then coverage is improved, but interference and redundant resource usage increase
Solution Approach 1:
The patent applies local quality by enabling each remote radio unit to transmit different signals tailored to local conditions. The system determines which units should transmit based on local user distribution and channel conditions, allowing differentiated transmission strategies across different locations rather than uniform transmission throughout the entire coverage area.
Solution Approach 2:
The patent implements dynamics by making the transmission configuration adaptive and time-varying. The system continuously monitors channel conditions and user locations, dynamically adjusting which remote radio units transmit and what they transmit based on real-time conditions, transforming the static all-or-nothing transmission approach into a dynamic selective transmission system.
2Productivity
If all remote radio units are activated, then capacity is improved, but noise contribution and sensitivity limit uplink SNR
Solution Approach 1:
The patent applies partial action by activating only the necessary subset of remote radio units rather than all units. The system determines the minimum required activation based on local user distribution and channel conditions, avoiding the excessive action of activating units that would only contribute noise without serving users, thereby improving uplink SNR while maintaining adequate capacity.
3Device complexity
If static routing is used, then system complexity is reduced, but adaptability to changing traffic conditions deteriorates
Solution Approach 1:
The patent implements feedback by establishing closed-loop control where the system continuously monitors channel conditions, user locations, and traffic patterns, then uses this information to adapt the routing and activation decisions. This feedback mechanism enables the system to respond to changing conditions without requiring overly complex centralized control, balancing simplicity with adaptability.
Data Source
AI summary
Provided herein is a dynamically coordination of a distribution of radio signals via distributed remote radio units, with respect to changing numbers and locations of user equipment. A distributing and combining unit combines uplink radio signals from the remote radio units and distributes downlink radio signals from the access unit according to dynamically changing specified criteria. A measurement unit measures performance indicators of the communication between the remote radio units and the mobile communication devices into a matrix of performance indicator values, calculates cost functions therefrom and generates output execution parameters by applying a decision process based on the calculated cost function. Communication criteria are dynamically updated according to the generated output execution parameters and the process is continuously iterative. The invention allows incorporating “smart” capabilities into legacy networks without any major physical changes of the network.