PSMP Procedure for VHT WLAN Bonding Channel Efficiency
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Solution Overview
Problem
The existing IEEE 802.11n power save multi-poll (PSMP) protocol is ineffective in efficiently using radio resources in very high throughput (VHT) WLAN systems, particularly when a VHT STA coexists with a legacy HT STA, leading to underutilization of channel bandwidth and reduced resource efficiency.
Innovation Solution
A new PSMP procedure for VHT WLAN systems using a bonding channel with a PSMP frame format that includes transmission time and channel information, allowing multiple STAs to simultaneously communicate during allocated downlink and uplink times, and allocating subchannels to each STA for efficient resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing IEEE 802.11n PSMP protocol is used in VHT WLAN systems, then legacy HT STAs can communicate with the access point, but radio resources are underutilized and channel bandwidth is not efficiently used
Solution Approach 1:
The bonding channel is segmented into multiple subchannels, and the PSMP protocol is enhanced to allocate specific subchannels to different STAs. This segmentation allows VHT STAs to utilize multiple subchannels simultaneously while HT STAs can use allocated subchannels, thereby improving overall radio resource efficiency while maintaining legacy compatibility
Solution Approach 2:
The PSMP protocol is made dynamic by introducing flexible subchannel allocation mechanisms. The access point can dynamically assign different subchannel combinations to different STAs based on their capabilities (VHT or HT) and current network conditions, optimizing resource utilization while ensuring legacy HT STA compatibility
2Productivity
If multiple STAs are allowed to simultaneously communicate during PSMP, then radio resource usage efficiency increases, but protocol complexity increases
Solution Approach 1:
The enhanced PSMP protocol serves multiple functions: it maintains compatibility with legacy HT STAs, enables simultaneous communication with multiple VHT STAs, and provides flexible subchannel allocation. By designing a universal protocol that handles both single-STA and multi-STA scenarios, the complexity is managed while achieving high resource efficiency
Solution Approach 2:
The access point acts as an intermediary that manages the complexity of multi-STA simultaneous communication. It processes subchannel allocation, coordinates transmissions, and handles protocol variations between HT and VHT STAs, thereby enabling efficient multi-STA communication without requiring complex peer-to-peer coordination between STAs
3Productivity
If subchannels are allocated to each STA, then resource efficiency improves, but frame format complexity increases
Solution Approach 1:
The PSMP frame format uses a nested structure where subchannel allocation information is embedded within the existing frame structure. The subchannel assignment data is nested within the PSMP protocol fields, allowing efficient resource allocation while maintaining a relatively simple and organized frame format that builds upon the existing IEEE 802.11n structure
Data Source
AI summary
A method of performing a power save multi-poll (PSMP) procedure of a very high throughput (VHT) wireless local access network (WLAN) system using a bonding channel consisting of a plurality of subchannels is provided. Wherein the PSMP procedure comprises a PSMP frame transmission phase, a downlink phase, and an uplink phase, and wherein the PSMP frame comprises transmission time information indicating a time allocated to each station (STA) in each of the downlink phase and the uplink phase and transmission channel information corresponding to the transmission time information.