Multicast to Unicast Frame Conversion for Wireless Service Discovery
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Solution Overview
Problem
In wireless networks, the conventional method of transmitting multicast/broadcast frames using traditional multicast/broadcast transmission leads to longer service discovery delays due to the longer time intervals between delivery traffic indication map (DTIM) beacons, which can be exacerbated by power saving modes in non-access point stations.
Innovation Solution
The approach involves treating multicast/broadcast frames as unicast frames and transmitting them using unicast transmission, allowing for earlier delivery of service discovery information by using specific information to control access point devices to buffer and transmit frames as unicast messages, even when stations are in power saving mode, thus reducing the delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional multicast/broadcast transmission is used, then power saving mode can be maintained, but service discovery delay increases
Solution Approach 1:
The patent changes the transmission mode parameter from multicast/broadcast to unicast, allowing the access point to send service discovery frames individually to each station. This enables stations to receive frames outside of DTIM beacon intervals, reducing service discovery delay while allowing power saving mode to continue operating with its原有 timing structure
Solution Approach 2:
The patent segments the service discovery process by allowing individual unicast transmissions separate from the collective multicast/broadcast DTIM beacon approach. Each station can be notified independently, enabling more flexible and timely service discovery without requiring all stations to wake up simultaneously for multicast transmissions
2Productivity
If DTIM beacon intervals are used for multicast transmission, then power saving mode is supported, but transmission frequency is limited
Solution Approach 1:
The patent introduces dynamic transmission behavior where the access point can switch between multicast/broadcast mode for power-saving operation and unicast mode for frequent transmissions. This dynamic adaptation allows the system to maintain power saving compatibility while enabling high-frequency service discovery transmissions when needed
Solution Approach 2:
The access point device is designed to perform multiple functions: it can transmit service discovery frames via traditional multicast/broadcast for power-saving operation, and simultaneously via unicast for frequent transmissions. This multi-functionality resolves the contradiction between transmission frequency and power saving compatibility
3Loss of time
If unicast transmission is used for service discovery frames, then service discovery delay is reduced, but network overhead increases
Solution Approach 1:
The patent applies partial unicast action by sending service discovery frames to specific stations that have indicated interest or need, rather than broadcasting to all stations. This selective approach reduces the overall number of transmissions compared to universal multicast while still achieving low latency for relevant stations
Data Source
AI summary
An electronic device includes a storage unit and a processing unit. The storage unit is configured for storing specific information. The processing unit is coupled to the storage unit and for controlling and accessing the storage unit. The processing unit is capable of accessing the specific information within the storage unit to control the electronic device to send the specific information to an access point device so as to make the access point device treat a multicast/broadcast frame as a unicast frame and transmit the unicast frame by using unicast transmission.