Wireless Communication Apparatus Close Proximity Scheme
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Solution Overview
Problem
In wireless communication systems based on carrier sense, such as IEEE 802.11, achieving equal coexistence between devices with different transmission power settings is challenging, particularly in close proximity scenarios where one device may be prevented from transmitting due to interference from another device with higher transmission power, leading to inefficient communication link maintenance and longer data exchange initiation times.
Innovation Solution
A wireless communication apparatus that supports both a normal and a close proximity scheme, with the latter limiting maximum transmission power and using a higher carrier sense level to avoid interference, allowing for point-to-point communication with reduced time to data exchange and distinct disconnection when communication distance exceeds a certain level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a wireless communication apparatus limits maximum transmission power for close proximity communication, then communication range is reduced to several centimeters, but the apparatus cannot transmit signals when another apparatus with normal transmission power is present within its communication range due to carrier sense level interference
Solution Approach 1:
The patent introduces a close proximity communication scheme that changes the carrier sense level parameter from the standard IEEE 802.11 level to a higher threshold specifically for close proximity transmissions. This parameter change allows the apparatus to differentiate between normal range signals and close proximity signals, enabling reliable transmission at reduced power levels without being blocked by carrier sense mechanisms designed for normal range communication.
2Reliability
If a wireless communication apparatus uses normal maximum transmission power, then it can maintain communication links reliably, but it prevents equal coexistence with apparatuses using reduced transmission power for close proximity communication
Solution Approach 1:
The patent implements dynamic transmission power control where the apparatus can switch between normal maximum transmission power and reduced transmission power based on communication requirements. The system dynamically adjusts the carrier sense level accordingly - using the standard level for normal range communication and a higher close proximity level for short-range transmissions. This dynamic adaptation enables equal coexistence between apparatuses with different transmission power settings by allowing each to operate in its appropriate power regime without interfering with the other.
3Adaptability or versatility
If conventional carrier sense mechanism is used, then multiple apparatuses can share the wireless medium, but apparatuses with reduced transmission power are placed in an inferior position and cannot transmit when higher power apparatuses are active
Solution Approach 1:
The patent introduces a close proximity communication scheme as an intermediary mechanism that operates alongside the conventional carrier sense mechanism. This intermediary scheme uses a higher carrier sense level threshold specifically for close proximity transmissions, allowing apparatuses to transmit in close proximity scenarios without being blocked by the standard carrier sense mechanism. The intermediary mechanism effectively mediates between the need for shared medium access and the need for efficient close proximity data exchange, enabling both apparatuses with reduced power and apparatuses with normal power to coexist and transmit simultaneously in their respective operational ranges.
Data Source
AI summary
A wireless communication apparatus supports a first scheme and a second scheme. A communication range for the second scheme is narrower than a communication range for the first scheme. Processing circuitry of the apparatus is configured to set first information and second information. If the second scheme is used, the processing circuitry sets a second level greater than a first level for the second information and sets a second power value smaller than a first power value for the first information. The first level and the first power value are used for the first scheme. The second power value is decided based on a receiving sensitivity required for a physical scheme selected by the second scheme.