Distributed Antenna Port Backoff Control for Wireless LAN
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Solution Overview
Problem
Existing wireless LAN systems face challenges in efficiently performing backoff and channel access for antenna ports distributed in a Distributed Antenna System (DAS), which limits the improvement of throughput and latency by extending the transmission distance.
Innovation Solution
The proposed method involves a receiving station checking for idle antenna ports, performing backoff based on their idle status, and accessing channels commonly idle across these ports, using a primary 20 MHz channel as a reference for channel access in the DAS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If antenna ports are distributed in a DAS to extend transmission distance, then coverage area is improved, but channel access efficiency deteriorates due to multiple idle port detection requirements
Solution Approach 1:
The patent combines the channel access control functions of multiple distributed antenna ports into a single primary BSS channel. Instead of each antenna port independently monitoring its own channel status, all antenna ports share a common primary BSS channel for idle detection and backoff operations, thereby improving channel access efficiency while maintaining distributed coverage.
Solution Approach 2:
The primary BSS channel serves multiple functions: it acts as the reference channel for idle status determination, the backoff counter reference channel, and the channel for receiving control information (EHT-SIG). This multi-functional design simplifies the channel access mechanism for distributed antenna ports.
2Reliability
If multiple antenna ports are used in DAS, then spatial diversity is improved, but backoff control complexity increases due to independent idle status determination
Solution Approach 1:
The patent merges the backoff control functions of multiple antenna ports by establishing a common backoff counter based on the primary BSS channel. All antenna ports use the same backoff counter value, eliminating the need for independent backoff control at each port and reducing overall system complexity while maintaining spatial diversity benefits.
3Adaptability or versatility
If distributed antenna ports perform independent channel access, then local optimization is improved, but overall throughput decreases due to redundant idle checks
Solution Approach 1:
The patent combines idle status determination across all distributed antenna ports by using a single primary BSS channel as the reference. Instead of each port independently checking its own channel status, all ports refer to the primary BSS channel's idle status, eliminating redundant checks and improving overall throughput while still allowing local adaptation through the shared reference mechanism.
Data Source
AI summary
Proposed are a method and device for performing backoff and channel access on antenna ports distributed in a DAS in a wireless LAN system. Specifically, a reception STA checks whether one or more of a plurality of antenna ports are idle. When one or more of the antenna ports are idle, the reception STA performs backoff on the one or more antenna ports. When a counter of the backoff becomes 0, the reception STA performs channel access on a first channel that is commonly idle in the one or more antenna ports. The reception STA receives a PPDU from a transmission STA through the first channel.