Wireless Announcement Packets for Spatial Reuse
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Solution Overview
Problem
The increasing densification of wireless communication systems leads to increased interference between overlapped basic service sets (BSSs), affecting the overall transmission efficiency due to the IEEE 802.11ax standard's limitations in spatial reuse mechanisms.
Innovation Solution
A method involving wireless communication devices that transmit announcement packets with specific network identifiers, permitted transmission power levels, and channel access delays to manage transmissions, allowing devices with permitted network identifiers to start transmissions at limited power levels after a channel access delay, thereby reducing interference and enhancing spatial reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless communication systems are densified to increase usage efficiency of frequency bands, then spatial reuse is improved, but interference between overlapped basic service sets increases
Solution Approach 1:
The patent applies local quality by assigning different transmission power levels to different spatial locations and BSSs. Each BSS is given a specific maximum transmission power level based on its location and interference characteristics, allowing dense spatial reuse while controlling local interference. The announcement packet mechanism enables each BSS to locally adjust its transmission parameters according to its specific environment.
Solution Approach 2:
The patent changes the transmission power parameter dynamically based on BSS density and interference conditions. By modifying the maximum transmission power level assigned to each BSS according to the announcement packet information received from neighboring BSSs, the system adapts to changing spatial conditions and maintains acceptable interference levels while maximizing spatial reuse efficiency.
2Reliability
If transmission power level is increased to improve signal quality, then transmission reliability is improved, but interference to other BSSs increases
Solution Approach 1:
The patent makes transmission power dynamic rather than fixed. Each BSS adjusts its transmission power level based on real-time information about neighboring BSSs received through announcement packets. This dynamic adjustment allows the system to optimize transmission reliability for each BSS while simultaneously controlling interference to others, as power levels are continuously adapted to current spatial conditions.
Solution Approach 2:
The announcement packet mechanism establishes a feedback loop where each BSS informs neighbors of its presence and transmission parameters, and each BSS uses this feedback information to adjust its own transmission power. This feedback mechanism ensures that transmission reliability is maintained for each BSS while interference to other BSSs is controlled through informed power level selection.
3Object-affected harmful factors
If channel access delay is imposed on permitted BSSs to reduce interference, then interference control is improved, but transmission latency increases
Solution Approach 1:
The patent applies preliminary action by having BSSs exchange announcement packets in advance to establish maximum transmission power levels and coordination parameters before actual data transmissions occur. This preliminary coordination allows BSSs to plan their transmissions more efficiently, reducing the need for excessive delays while maintaining interference control through pre-established power level agreements.
Data Source
AI summary
A method of handling wireless transmissions in a wireless communication system is disclosed. The method includes: transmitting, by a first wireless communication device, an announcement packet, in which the announcement packet includes a source network identifier, a permitted network identifier, a permitted transmission power level corresponding to the permitted network identifier, and a channel access delay corresponding to the permitted network identifier; starting, by a second wireless communication device with the source network identifier, a first transmission at a normal transmission power level; and starting, by a third wireless communication device with the permitted network identifier, a second transmission at a limited power level not higher than the permitted transmission power level after the channel access delay from a time at which the first wireless communication device starts transmitting the announcement packet.