Restricted Access Window Beacon Transmission Scheduling
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Solution Overview
Problem
Wireless communication systems face challenges in protecting beacon transmission intervals from overlapping transmissions by other devices, particularly in multi-hop scenarios where relays may not be aware of each other's transmission schedules, leading to potential collisions and delays.
Innovation Solution
The implementation of a mechanism where a wireless device can request a parent node to establish a restricted access window (RAW) during its transmission interval, ensuring that other devices refrain from transmitting, thereby preventing overlapping and ensuring the beacon transmission is protected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beacon transmissions are allowed without restriction during transmission intervals, then network efficiency and channel utilization are improved, but transmission collisions and interference occur leading to unreliable beacon delivery
Solution Approach 1:
The patent establishes Restricted Access Windows (RAWs) in advance before beacon transmissions occur. The parent node allocates specific time intervals as RAWs to child nodes that need to transmit beacons, preventing collisions before they can happen. This preliminary scheduling ensures reliable beacon delivery while maintaining efficient channel utilization through advance planning.
Solution Approach 2:
The patent divides the transmission medium into separate Restricted Access Windows allocated to different child nodes at different time intervals. Instead of allowing all nodes to contend for the channel simultaneously, the transmission opportunity is segmented into discrete time slots, each assigned to a specific node for beacon transmission, eliminating collisions while maintaining overall network efficiency.
2Adaptability or versatility
If relays are allowed to transmit beacons independently without coordination, then each relay can maintain its own transmission schedule, but overlapping transmissions from unaware relays cause collisions and delays
Solution Approach 1:
The patent introduces a parent node as an intermediary that coordinates beacon transmissions among child relays. The parent node receives RAW allocation requests from child relays, processes their transmission needs, and assigns non-overlapping time intervals. This intermediary coordination allows relays to maintain operational independence while ensuring their beacon transmissions do not collide, resolving the conflict between autonomy and reliability.
3Reliability
If transmission intervals are extended to ensure complete beacon delivery, then transmission reliability is improved, but the time available for other network activities is reduced
Solution Approach 1:
The patent establishes Restricted Access Windows in advance that are precisely sized to accommodate each relay's beacon transmission requirements. By planning ahead and allocating exact time intervals needed for reliable beacon delivery, the system avoids both under-allocation (which would cause collisions) and over-allocation (which would waste time). This preliminary scheduling optimizes the balance between reliability and time efficiency.
Data Source
AI summary
Certain aspects of the present disclosure provide methods and apparatus for a relay to indicate a transmission interval it wishes to be protected by a restricted access window (RAW) restricting transmission by other devices. An apparatus for wireless communications is provided herein. The apparatus generally includes a processing system that is configured to identify a transmission interval. The apparatus also includes a transmitter that is configured to transmit a request requesting a wireless node to establish a RAW for restricting network traffic during the transmission interval.