Dynamic Medium Reservation Modification in Wireless Networks
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing medium reservations, particularly for low-power devices that may not transmit with sufficient power for other devices to detect, leading to potential interference and inefficient bandwidth usage, especially in scenarios with variable-bit-rate streams where the amount of data to be transmitted is uncertain.
Innovation Solution
A reservation-modification system that allows a slave device to request a modified reservation from a master device within the same service period, enabling the slave device to adjust the reservation for larger or smaller time slots as needed, thereby optimizing medium usage without violating the existing reservation scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a master device reserves the medium for a slave device for a fixed time period, then the medium usage is predictable and stable, but the slave device cannot adapt to variable data transmission needs resulting in wasted bandwidth or insufficient transmission time
Solution Approach 1:
The patent implements dynamic medium reservation by allowing slave devices to request reservation modifications (extensions or contractions) during the service period. The master device can grant or deny these requests based on current medium usage conditions, transforming the static reservation system into a dynamic one that adapts to real-time data transmission needs.
Solution Approach 2:
The patent changes the reservation time period parameter dynamically during the service period. Instead of fixing the reservation duration in advance, the system allows modification of this parameter based on actual transmission requirements, enabling the reservation to expand or contract as needed while maintaining overall system stability.
2Use of energy by moving object
If a slave device transmits with low power to conserve energy, then power consumption is reduced, but other devices cannot detect the transmission leading to potential interference and inefficient bandwidth usage
Solution Approach 1:
The master device performs preliminary actions by sending poll messages to slave devices before the slave transmits data. This allows the master to initiate communication and coordinate the transmission schedule, enabling the slave to transmit at lower power levels while the master remains actively monitoring and managing the medium access.
Solution Approach 2:
The system implements feedback mechanisms where the master device receives data from slave devices and provides acknowledgments or additional poll messages. This feedback loop ensures reliable transmission detection and coordination, allowing slave devices to operate at lower power while maintaining system-wide awareness and preventing interference.
3Loss of time
If the system waits for the next service period to negotiate medium reservations, then the reservation scheme remains stable and simple, but latency increases for time-sensitive data transmission
Solution Approach 1:
The patent enables continuous reservation negotiation within the service period rather than waiting for the next service period. Slave devices can request reservation modifications at any point during their allocated time, and the master device can grant these requests immediately, maintaining continuous useful action without interruption or delay to data transmission.
4Reliability
If the master device grants large medium reservations to ensure sufficient transmission time, then data transmission completeness is improved, but bandwidth efficiency decreases due to excessive reservations
Solution Approach 1:
The patent applies partial action by allowing slave devices to request reservation modifications only when needed. Instead of always granting maximum reservations, the master device evaluates each request and grants only the necessary extension or contraction, avoiding excessive reservations while ensuring sufficient transmission time when required.
Data Source
AI summary
In a network environment, a wireless medium is reserved for transmissions. Medium reservation modifications can be requested and granted wherein a master device allocates a medium using reservations that are observed by other devices sharing the medium and a slave device complies with reservations by holding data for transmission until its reservation in time arrives by determining a reserved length of an upcoming transmitting opportunity reserved for a slave device, determining a desired length for transmitting data from the slave device over the medium, comparing the reserved length and the desired length to determine if a medium reservation modification is warranted, if the medium reservation modification is warranted, requesting, during the reserved time covered by the medium reservation, the medium reservation modification, and determining whether to grant or deny the medium reservation modification and conveying the determination to the slave device.