Distributed Antenna Beam Search Using Dynamic Combination History
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Solution Overview
Problem
In high-frequency bands, distributed antenna systems face increased overhead and reduced transmission efficiency due to the need for extensive beam searches, which can be exacerbated by insufficient beam combination history records, especially in areas where terminal devices have not previously operated, leading to potential reductions in transmission capacity.
Innovation Solution
A communication control device that performs all-beam searches in varying orders across distributed antennas, sets a detection reference beam, and records optimal beam combinations dynamically, reducing the need for full searches by identifying candidate beams based on previous history and detection results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extensive beam searches are performed in distributed antenna systems, then reliable beam selection is achieved, but overhead increases and transmission efficiency decreases
Solution Approach 1:
The system performs preliminary beam searches and stores beam combination history records in advance. When a terminal device is detected, the system retrieves pre-stored beam combinations from the history table that match the detected antenna, avoiding the need to perform extensive beam searches from scratch, thus reducing overhead while maintaining reliable beam selection
Solution Approach 2:
The system creates and stores copies of successful beam combinations in a history table for future use. Instead of re-discovering optimal beams through exhaustive search each time, the system copies previously validated beam combinations and reuses them, significantly reducing search overhead while maintaining transmission reliability
2Productivity
If beam combination history records are insufficient, then beam search overhead is reduced, but transmission capacity is compromised
Solution Approach 1:
The system implements feedback mechanisms where beam search results are continuously monitored and stored in the history table. When beam combinations are found to be suboptimal or when new terminal devices are detected, the system updates the history records accordingly, ensuring that the stored beam combinations remain valid and maintain transmission capacity
Solution Approach 2:
The beam combination history table is dynamically updated based on detected terminal devices and communication conditions. The system adapts the stored beam combinations in real-time, adding new records when terminal devices are detected and removing or updating records when conditions change, ensuring that the system maintains transmission capacity while avoiding exhaustive searches
3Measurement precision
If all-beam searches are performed in fixed order, then systematic beam coverage is achieved, but beam combinations become fixed and adaptable
Solution Approach 1:
The system performs all-beam searches in periodic cycles with varying orders. Instead of using a fixed search order, the system changes the search sequence periodically, allowing it to discover different beam combinations that may be optimal under varying conditions, thus maintaining both systematic coverage and adaptability
Solution Approach 2:
The system inverts the conventional fixed-order approach by deliberately varying the search order in reverse or different sequences. This inversion strategy allows the system to explore beam combinations that would be missed in fixed-order searches, enhancing adaptability while maintaining systematic coverage through structured variation
Data Source
AI summary
Each of a plurality of distributed antennas is caused to perform an all-beam search performed by transmitting beams in all transmittable directions in a beam search period for searching for a beam to be used for wireless communication with a terminal device in a different order of the distributed antennas for each beam search period, the all-beam search is stopped when one beam identifier indicating a best beam has been acquired according to the all-beam search, a beam identified by the acquired beam identifier and information indicating a distributed antenna that has transmitted the beam indicated by the beam identifier is set as a detection reference beam, a beam identifier of a distributed antenna that has not performed the all-beam search, which corresponds to a beam that has been selected together with the detection reference beam, is detected as a candidate beam identifier for the distributed antenna from a beam combination history storage unit, and whether or not to cause the distributed antenna that has not performed the all-beam search in the beam search period to perform the all-beam search is determined on the basis of detection results.