Wireless Deferral Mechanism for Power Imbalance Access
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Solution Overview
Problem
In wireless networks, devices with lower transmit power face difficulties accessing the medium due to dominance by higher power devices, leading to imbalanced access and reduced medium reuse, especially in CSMA networks with transmit power imbalances.
Innovation Solution
A deferral mechanism that senses data units transmitted on a CSMA network, determines transmit and received power, and adjusts transmission based on thresholds to ensure fair access, allowing low power devices to initiate transmissions when conditions are favorable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices with higher transmit power dominate the medium in CSMA networks, then their transmission reliability is improved, but medium reuse efficiency deteriorates and low power devices cannot access the medium
Solution Approach 1:
The patent changes the power threshold parameter dynamically based on the transmit power of the sensed data unit. When a high power transmission is sensed, the receiving device adjusts its power threshold upward, allowing it to detect and defer to high power transmissions while still permitting low power devices to access the medium. This parameter adaptation resolves the contradiction by making the medium access decision context-dependent rather than fixed.
2Productivity
If low power devices attempt to access the medium, then medium reuse improves, but collisions with high power transmissions increase
Solution Approach 1:
The patent implements a feedback mechanism where receiving devices sense incoming data units, determine their transmit power, and adjust their own transmission decisions based on this information. The power threshold is updated based on the sensed transmit power, creating a feedback loop that allows low power devices to access the medium when high power devices are not transmitting, thereby reducing collisions while improving medium reuse.
3Device complexity
If current access algorithms are used in CSMA networks, then simple implementation is maintained, but fair access among devices with different power levels deteriorates
Solution Approach 1:
The patent applies preliminary action by having devices determine the transmit power of sensed data units before making access decisions. By预先 (in advance) assessing the power level of ongoing transmissions and adjusting the power threshold accordingly, devices can make informed access decisions that ensure fair medium sharing. This preliminary power assessment adds minimal complexity while dramatically improving access fairness.
Data Source
AI summary
The deferral mechanism described herein may improve medium reuse in a wireless network with transmit power imbalances. For example, in one embodiment, an apparatus employing the deferral mechanism described herein may comprise a receiver to sense a data unit transmitted on a medium associated with the wireless network, wherein the data unit may comprise information indicating a transmit power associated therewith. Furthermore, the apparatus may comprise one or more processors to initiate a transmission on the medium associated with the wireless network if the apparatus is not an intended receiver of the sensed data unit, the transmit power associated with the data unit exceeds a transmit power associated with the apparatus, and a received power associated with the data unit does not equal or exceed a clear channel assessment threshold plus a difference between the transmit power associated with the data unit and the transmit power associated with the apparatus.