Coordinated Beamforming Frame Format for AP CSI Sharing
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Solution Overview
Problem
Existing protocols for coordinated beamforming (CoBF) in IEEE 802.11 do not adequately address the sharing of selected user information among coordinated access points (APs) and vendor-specific precoder computation leads to interference.
Innovation Solution
A method for sharing channel state information (CSI) and precoder information among collaborating APs through a standardized frame structure, including a protocol for AP-AP communication and frame formats to manage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If existing protocols are used for CoBF in IEEE 802.11, then implementation is simple, but selected user information cannot be adequately shared among coordinated APs
Solution Approach 1:
The information sharing protocol is segmented into distinct message types (AP-AP share messages) with specific frame structures. Each message contains dedicated fields for selected user information, CSI, and precoder data, allowing systematic information exchange without requiring complete protocol redesign.
Solution Approach 2:
A standardized AP-AP share message format acts as an intermediary structure between different APs. This standardized format enables information sharing without direct complex interactions, providing a mediator layer that simplifies the overall system while ensuring complete information exchange.
2Adaptability or versatility
If vendor-specific precoder computation is used, then implementation flexibility is high, but interference occurs between collaborating APs
Solution Approach 1:
The protocol changes the computation parameters by standardizing the precoder computation method across all collaborating APs. By defining specific computation rules and information exchange formats, the system maintains adaptability through configurable parameters while eliminating interference caused by inconsistent vendor-specific implementations.
Solution Approach 2:
The protocol implements feedback mechanisms where APs exchange CSI and precoder information through standardized messages. This feedback loop allows each AP to adjust its precoder computation based on information from other APs, maintaining flexibility while coordinating to minimize interference through iterative optimization.
3Object-generated harmful factors
If standardized frame structure is implemented for information sharing, then interference management is improved, but implementation complexity increases
Solution Approach 1:
The frame structure is segmented into clearly defined fields (selected user field, CSI fields, precoder information fields, identifier fields). This segmentation makes the standardized structure manageable by breaking down complex information exchange into discrete, organized components that are easier to implement and process.
Data Source
AI summary
The present disclosure provides methods and apparatus for coordinated beamforming. An aspect of the disclosure provides a method. The method includes sending, by a first access point (AP) of a plurality of collaborating APs, to one or more stations (STAs) associated with the plurality of collaborating APs, a request for channel state information (CSI) associated with the one or more STAs and the first AP. The method further includes receiving a response including the CSI associated with the one or more STAs and the first AP. The method further includes sending, to a second AP of the plurality of collaborating APs, a sounding request indicating the second AP to request, from the one or more STAs, CSI associated with the one or more STAs and the second AP. The method further includes sharing CSI information between the first and the second AP.