Non-Contiguous Band MAC Entities Sharing Control Frame Transmission
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Solution Overview
Problem
Wireless communication systems, particularly WLANs, face challenges in efficiently managing multi-band communications and coexistence between different frequency bands, leading to issues like crowded low-frequency bands and inefficient beamforming training processes.
Innovation Solution
A Link Layer Service Platform (LSP) that enables assisted multi-band wireless communications by using a first radio to assist communications via a second radio, allowing control frames to be transmitted and received using one protocol to facilitate data transmission in another protocol, thereby maintaining clock synchronization and reducing the number of antenna sectors needed during beamforming training.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If control frames are transmitted using the second wireless protocol (high band) directly, then communication autonomy in high band is maintained, but beamforming training time increases due to sweeping through more antenna sectors
Solution Approach 1:
The first wireless protocol (low band) acts as an intermediary to assist beamforming training for the second wireless protocol (high band). The low band control frames carry beamforming training information that guides the high band beamforming process, reducing the number of antenna sectors that need to be swept and accelerating training convergence.
Solution Approach 2:
Beamforming training information is exchanged preliminarily using the first wireless protocol before high band data transmission begins. This preliminary action establishes beamforming parameters in advance, so that when high band transmission starts, the antenna sector sweeping is already optimized and requires fewer iterations.
2Adaptability or versatility
If multi-band communications are managed independently, then protocol autonomy is maintained, but coexistence between different frequency bands deteriorates leading to crowded low-frequency bands
Solution Approach 1:
The first wireless protocol (low band) serves multiple functions: it carries both its own data traffic and assists the second wireless protocol (high band) by transmitting control frames. This multi-functionality allows efficient utilization of the low band without requiring separate dedicated control channels, reducing overall band crowding.
Solution Approach 2:
The low band protocol acts as a mediator that enables high band communications by carrying control information. This intermediary role allows high band data transmission to be facilitated without the high band protocol needing to handle control overhead, improving spectral efficiency across both bands.
3Device complexity
If a single radio handles all communications, then device complexity is reduced, but communication performance in high band frequencies deteriorates
Solution Approach 1:
The communication system is segmented into two separate radios: the first radio handles low band communications and assists with control functions, while the second radio is dedicated to high band data transmission. This segmentation allows each radio to be optimized for its specific frequency band, ensuring high band performance is not compromised by low band interference.
Solution Approach 2:
The controller merges the functionality of both radios by using the first radio to assist the second radio. Control frames transmitted by the first radio carry information that enables the second radio to optimize its high band communications, combining the strengths of both radios into a coordinated multi-band system.
4Productivity
If control frames are transmitted using the first wireless protocol (low band) to assist the second protocol, then beamforming training is accelerated and coexistence is improved, but clock synchronization between protocols becomes more challenging
Solution Approach 1:
The controller implements feedback mechanisms to monitor and adjust timing relationships between the first and second wireless protocols. By continuously monitoring clock drift and timing offsets, the system can dynamically adjust synchronization parameters to maintain reliable coordination between the two protocols despite operating on different frequency bands.
Data Source
AI summary
A network device includes a first medium access control entity and a second medium access control entity. The first medium access control entity is configured to transmit and receive in a first frequency band. The second medium access control entity is configured to transmit and receive in a second frequency band, wherein the second frequency band is higher than and non-contiguous with the first frequency band. The first medium access control entity is configured to receive a control frame and operate as a pass-through to pass at least a portion of the control frame from the first medium access control entity to the second medium access control entity as opposed to forwarding the control frame to a physical layer entity or a processor of the network device. The second medium access control entity is configured to transmit the at least the portion of the control frame in the second frequency band.