Distributed Antenna Port Pairing in Wireless LAN DAS
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless LAN systems face challenges in efficiently pairing distributed antenna ports with receiving STAs in DAS, which limits the improvement of throughput and latency performance by extending transmission distance.
Innovation Solution
A sounding method and apparatus are proposed for pairing between distributed antenna ports in a DAS and a receiving STA, involving the transmission of a Null Data Packet Announcement (NDPA) and Null Data Packets (NDPs) across multiple antenna ports, followed by feedback from the receiving STA to determine optimal channel state measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed antenna ports are used in DAS, then transmission distance is extended and throughput is improved, but pairing efficiency between antenna ports and receiving STAs deteriorates
Solution Approach 1:
The patent applies preliminary action by performing channel state measurement and pairing determination before actual data transmission. The transmitting STA sends NDPA and NDP packets in advance to enable the receiving STA to measure channel states and determine optimal antenna port pairings, so that when data transmission occurs, the pairing is already optimized for maximum throughput.
Solution Approach 2:
The patent implements feedback by having the receiving STA send feedback information back to the transmitting STA based on channel state measurements. This feedback loop enables the transmitting STA to adjust and optimize antenna port pairings based on actual channel conditions, resolving the pairing complexity while maintaining high throughput through iterative optimization.
2Length of stationary object
If distributed antenna ports are used in DAS, then transmission distance is extended, but latency performance deteriorates
Solution Approach 1:
The patent reduces latency by performing channel state measurement and pairing determination in advance before data transmission. The NDPA and NDP packets are sent beforehand to establish optimal pairings, so that when actual data transmission occurs over extended distances, the pairing optimization is already complete, minimizing the time loss associated with dynamic adjustment during transmission.
3Productivity
If channel state measurement is performed for each antenna port, then pairing efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent applies segmentation by dividing the channel state measurement process into distinct stages using separate packet types. The NDPA packet carries announcement information for multiple antenna ports, while the NDP packet carries actual sounding data. This segmentation allows efficient measurement of each antenna port's channel state without requiring a separate signaling exchange for each port, reducing overall overhead while maintaining pairing efficiency.
Data Source
AI summary
Provided is a sounding procedure for pairing antenna ports distributed in a DAS and a reception STA in a wireless LAN system. Specifically, the reception STA receives NDPA from a transmission STA. The reception STA receives an NDP from the transmission STA. The reception STA receives a trigger frame from the transmission STA. The reception STA transmits feedback information to the transmission STA. The transmission STA operates in a system in which a plurality of antenna ports are distributed. A first primary 20 MHz channel is a primary 20 MHz channel present in one BSS. Second primary 20 MHz channels are additional primary 20 MHz channels for the plurality of antenna ports, respectively.