WTRU LRRE HARQ Mode Switching for Extended WLAN Range
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication networks lack methods for enabling hybrid automatic repeat request (HARQ) scheduling and medium access in the 6 GHz band, particularly for wireless local area networks (WLAN) devices, which limits their range and efficiency due to the absence of legacy devices in this frequency band.
Innovation Solution
A method and apparatus for a wireless transmit/receive unit (WTRU) that receives low rate range extension (LRRE) information from an access point (AP), determines if a channel quality condition is met, and switches to a LRRE HARQ mode to enable extended range communications using modified physical layer convergence procedure (PLCP) protocol data units (PPDUs with specific fields for LRRE HARQ mode indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional WLAN protocols are used in the 6 GHz band, then legacy device compatibility is maintained, but transmission range is limited
Solution Approach 1:
The patent implements dynamic mode switching between conventional WLAN protocol and LRRE HARQ mode based on channel conditions and distance. The system adapts its operation mode in real-time, transitioning to LRRE HARQ mode when extended range is needed and channel quality permits, thereby resolving the contradiction between maintaining legacy compatibility and achieving extended transmission range.
Solution Approach 2:
The patent changes key transmission parameters including modulation and coding scheme (MCS), power levels, and protocol mode based on distance and channel quality indicators. By dynamically adjusting these parameters and switching to LRRE HARQ mode with modified PPDUs, the system extends transmission range while maintaining adaptability to different operating conditions.
2Reliability
If HARQ transmissions are implemented in the 6 GHz band, then transmission reliability is improved, but device complexity increases due to lack of legacy support
Solution Approach 1:
The patent designs the LRRE HARQ mechanism to be universally applicable in the 6 GHz band where no legacy devices operate. The modified PPDUs with LRRE HARQ mode indications and extended range parameters provide a unified protocol that simultaneously handles reliability through HARQ retransmissions and simplifies device implementation by eliminating the need for legacy compatibility logic in this frequency band.
3Length of moving object
If low rate range extension mode is activated, then extended range communication is achieved, but data transmission rate decreases
Solution Approach 1:
The patent implements dynamic rate adaptation within LRRE HARQ mode, adjusting modulation and coding schemes based on channel quality indicators and distance. The system transitions between different MCS levels and HARQ retransmission strategies to optimize the trade-off between extended range and data transmission rate, achieving high productivity when channel conditions permit and maintaining connectivity when they do not.
Data Source
AI summary
A method for use in a wireless transmit/receive unit (WTRU). The method comprises: receiving LRRE information from an AP; determining whether a first condition is satisfied by the WTRU, wherein the first condition is satisfied by the WTRU, on a condition that the first condition is satisfied, sending a mode change request to the AP to change an operation mode to a LRRE HARQ mode; receiving a response regarding the mode change request from the AP; and communicating with the AP using a plurality of PPDUs, each of the PPDUs comprising at least one field enabling transmissions between the WTRU and the AP under the first condition and a LRRE HARQ mode indication.