DAS Element Bitmap for STR NSTR Antenna Port Indication
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Solution Overview
Problem
In wireless LAN systems, particularly in next-generation systems like IEEE 802.11be, there is a need to efficiently indicate whether Simultaneous Transmit and Receive (STR) or non-STR (NSTR) is supported between distributed antenna ports in a Distributed Antenna System (DAS), to prevent interference and optimize signal transmission and reception.
Innovation Solution
A method and apparatus are proposed to indicate whether STR or NSTR is supported by using a bitmap in the Distributed Antenna System (DAS) element of a beacon frame. This bitmap specifies which antenna ports support STR or NSTR, allowing for appropriate signal transmission and reception configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed antenna ports are used in DAS to increase spatial streams, then throughput and transmission distance are improved, but interference between antenna ports increases and requires complex signaling to manage STR/NSTR support
Solution Approach 1:
The patent applies preliminary action by pre-configuring and indicating STR/NSTR support relationships between antenna ports before actual communication occurs. The DAS element contains pre-established STR/NSTR information that allows stations to anticipate and avoid interference scenarios, enabling proactive interference management rather than reactive measures.
Solution Approach 2:
The patent introduces an intermediary mechanism through the DAS element and its STR/NSTR indication fields. This intermediary structure mediates between multiple antenna ports by providing a centralized information source that defines compatibility relationships, allowing stations to make informed decisions about simultaneous transmit and receive operations without direct interference.
2Length of stationary object
If distributed antenna ports are used in DAS to extend transmission distance, then coverage is improved, but device complexity increases due to signaling requirements for STR/NSTR indication
Solution Approach 1:
The patent merges STR/NSTR indication information into the existing DAS element structure. By combining these signaling functions within a single element rather than requiring separate signaling mechanisms, the patent reduces overall signaling complexity while maintaining the ability to indicate STR/NSTR support relationships between distributed antenna ports.
Solution Approach 2:
The DAS element is designed with multi-functionality, serving both as a identifier for distributed antenna ports and as a carrier for STR/NSTR support information. This universal structure eliminates the need for separate dedicated signaling elements, thereby reducing device complexity while enabling extended transmission distance through proper antenna port management.
3Productivity
If bitmap is used to indicate STR/NSTR support between antenna ports, then signaling efficiency is improved and cost is reduced, but information overhead increases
Solution Approach 1:
The patent applies partial action by using a bitmap that indicates only the necessary STR/NSTR relationships between antenna ports rather than providing complete pairwise information for all possible port combinations. The bitmap selectively marks supported relationships, reducing information overhead while maintaining signaling efficiency for the actual communication scenarios.
Data Source
AI summary
Proposed are a method and device for indicating whether STR or NSTR is supported between distributed antenna ports in a DAS in a wireless LAN system. Particularly, a reception STA receives, from a transmission STA, a beacon frame comprising a DAS element. The reception STA confirms control information about whether STR or NSTR is supported between a plurality of antenna ports, on the basis of the DAS element. The reception STA receives a signal from the transmission STA or transmits a signal to the transmission STA, via at least one antenna port among the plurality of antenna ports in one link, on the basis of the control information.