Parallel WLAN Communication with Legacy Receivers
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Solution Overview
Problem
There is a need for wireless communication systems to support parallel communication with legacy 802.11 WLAN receivers using new technologies like SDMA and OFDMA without causing collisions, as existing systems face challenges in higher throughput and reliability with legacy equipment.
Innovation Solution
The implementation of SDMA technology in wireless communication systems, specifically using Block ACK Request (BAR) and No ACK methods, allows for parallel transmissions to multiple legacy 802.11n and 802.11g receivers, avoiding immediate acknowledgments and using Power Save Multi-Poll (PSMP) to manage data transmission and acknowledgment efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SDMA and OFDMA technologies are used for parallel transmissions, then throughput is improved, but collisions occur with legacy 802.11 receivers
Solution Approach 1:
The patent segments the acknowledgment process into different types (Immediate ACK, Block ACK, No ACK) that can be selectively applied to different receivers. This segmentation allows the system to maintain parallel transmissions to multiple legacy receivers without collisions, as each receiver type can be handled with an appropriate acknowledgment strategy that prevents interference
Solution Approach 2:
The patent implements preliminary action by using Power Save Multi-Poll (PSMP) sequences to pre-coordinate transmission and acknowledgment timing. The PSMP downlink and uplink sequences are established in advance, allowing the system to prepare acknowledgment opportunities before collisions can occur, thereby enabling reliable parallel communications with legacy equipment
2Reliability
If immediate acknowledgments are used for parallel transmissions, then reliability is improved, but collisions occur between simultaneous transmissions
Solution Approach 1:
The patent applies dynamics by making the acknowledgment mechanism flexible and adaptive rather than fixed. The system dynamically selects from multiple acknowledgment types (Immediate ACK, Block ACK, No ACK) based on receiver capability and transmission conditions. This dynamic approach allows parallel transmissions to proceed efficiently while maintaining reliability through appropriate acknowledgment strategies for each receiver
Solution Approach 2:
The patent changes the acknowledgment parameter from a single fixed mode to multiple selectable modes. By introducing different acknowledgment types with different timing and targeting characteristics, the system can adjust the acknowledgment behavior to prevent collisions while maintaining reliability. The Block ACK mechanism, for example, changes the timing parameter of acknowledgments to occur after multiple transmissions rather than immediately after each one
3Reliability
If Block ACK method is used with legacy receivers, then collision avoidance is improved, but device complexity increases
Solution Approach 1:
The patent introduces PSMP sequences as an intermediary mechanism that mediates between the transmitter and legacy receivers. The PSMP downlink and uplink sequences act as a coordinating framework that simplifies the management of Block ACK operations. Rather than directly managing complex acknowledgment timing for each receiver, the system uses PSMP as an intermediary structure that automatically coordinates the timing and prevents collisions
4Productivity
If parallel transmissions are implemented, then productivity is improved, but compatibility with legacy equipment deteriorates
Solution Approach 1:
The patent implements universality by designing a multi-functional acknowledgment system that can handle different receiver types with a single unified framework. The system universally supports Immediate ACK, Block ACK, and No ACK methods, allowing it to communicate efficiently with both legacy 802.11 receivers and newer equipment that supports parallel transmissions. This multi-functional approach ensures backward compatibility while enabling advanced productivity features
Data Source
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AI summary
A method for parallel communication with wireless local area network (WLAN) receivers is described. A parallel transmission is started. A first MAC protocol data unit (MPDU) is sent to a first WLAN receiver. An acknowledgment (ACK) request is sent to the first WLAN receiver. An ACK is received from the first WLAN receiver.