WLAN Private Control Channel for Multi-Band Resource Scheduling
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Solution Overview
Problem
Existing wireless local-area networks face inefficiencies in resource utilization due to devices sharing limited communication protocols and hardware bandwidth, necessitating a more effective management of communication resources to enhance bandwidth and response times.
Innovation Solution
Implementing a private control channel within WLANs using multi-link devices (MLDs) to manage communications across different bands, allowing for efficient scheduling and ordering of location measurement reports, traffic indication maps, and beacon intervals based on Time Synchronized Channel Access (TWT) protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a private control channel is implemented using a local license band, then channel access efficiency and latency are significantly improved, but device complexity and implementation cost increase
Solution Approach 1:
The system segments the wireless spectrum into different bands: a local license band (e.g., 6 GHz) for high-efficiency control channel operations and a shared band (e.g., 2.4 GHz or 5 GHz) for data communications. This segmentation allows the control channel to operate independently with higher efficiency while data traffic uses the shared spectrum, resolving the contradiction between improved productivity and increased device complexity.
Solution Approach 2:
The patent introduces a private control channel as an intermediary mechanism between stations and the access point. This control channel uses the local license band to carry control information and scheduling decisions, enabling efficient coordination without requiring full duplex infrastructure. The intermediary control channel resolves the complexity of implementing full low-latency systems while maintaining improved productivity.
2Speed
If full duplex is used to reduce latency, then communication speed improves, but device complexity and cost increase
Solution Approach 1:
Instead of implementing expensive full duplex infrastructure, the patent uses a simpler control channel approach where the access point transmits control information unidirectionally on the local license band. Stations use this control information to schedule their data transmissions efficiently on the shared band. This disposable-like approach provides sufficient latency reduction without requiring complex full duplex hardware.
3Loss of time
If preemption is implemented to manage channel access, then latency is reduced, but channel management complexity increases
Solution Approach 1:
The access point performs preliminary action by transmitting advance information about upcoming data transmissions and resource allocations on the private control channel before the actual data transmission occurs. This allows stations to prepare their receivers and buffers in advance, reducing latency without requiring complex real-time preemption mechanisms. The control channel carries scheduling decisions that are prepared beforehand, simplifying channel management while maintaining low latency.
4Adaptability or versatility
If multiple stations share the same channel resources, then network versatility improves, but channel busy time increases and latency worsens
Solution Approach 1:
The system dynamically allocates time and frequency resources based on the specific needs of each station. The access point uses the private control channel to transmit dynamic scheduling information that adapts to varying traffic conditions. This dynamic resource allocation allows multiple stations to share the network efficiently while minimizing channel busy time, as the system can quickly adjust allocations based on current demands rather than using fixed time slots.
Data Source
AI summary
Methods, apparatuses, and computer readable media for wireless local area network (WLAN) private control channel are disclosed. Apparatuses of a non-access point (AP) multi-link device (MLD) are disclosed, where the apparatuses comprise processing circuitry configured to: associate, a first non-AP of the non-AP MLD, with an AP MLD and encode a first packet for transmission, by the first non-AP, to a first AP of the AP MLD, the first AP operating on a first frequency band, the packet indicating a request for a resource from a second AP of the AP MLD, the second AP operating on a second frequency band. The processing circuitry is further configured to decode a second packet from the first AP, the second packet indicating a resource unit (RU) for a second non-AP of the non-AP MLD to use to transmit a packet to or receive a packet from the second AP.