Wireless Base Station Sounding Trigger Frame Coordination
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Solution Overview
Problem
Current wireless base station technologies face challenges in efficiently collecting sounding information across multiple base stations, leading to prolonged time requirements and accuracy deterioration, especially when each base station operates independently.
Innovation Solution
A wireless base station system that includes a control unit capable of transmitting a Sounding Trigger frame, which instructs other base stations and terminal devices on timing and spatial information for channel measurements, allowing synchronized or staggered transmission of NDP frames, thereby reducing the time needed for collecting channel state information and maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each wireless base station performs sounding independently by transmitting NDP-A frames or NDP frames each time, then each base station can acquire channel information, but the sounding process takes time and the degree of followability to channel fluctuations deteriorates
Solution Approach 1:
The patent merges the sounding operations of multiple wireless base stations into a single coordinated process. The master base station transmits a single NDP-A frame that triggers slave base stations to transmit their NDP frames simultaneously, consolidating what would otherwise be multiple sequential sounding operations into one synchronized event, thereby reducing total sounding time while maintaining channel information acquisition for all base stations
2Loss of time
If wireless base stations cooperate to simultaneously transmit sounding frames by trigger from a master base station, then the sounding sequence is shortened, but this method only works when base stations can cooperate and cannot handle independent transmission
Solution Approach 1:
The patent introduces dynamic adaptability by enabling the system to switch between two operational modes: coordinated sounding (when base stations can cooperate) and independent sounding (when base stations operate autonomously). The master base station can dynamically select the appropriate mode based on the capabilities and states of slave base stations, making the system flexible enough to handle both cooperative and independent transmission scenarios
3Reliability
If multiple wireless base stations are installed in a home for cooperative transmission, then transmission reliability improves, but the time required for collecting sounding information increases and accuracy deteriorates
Solution Approach 1:
The patent implements preliminary action by having the master base station transmit the NDP-A frame in advance, which contains timing and synchronization information that pre-coordinates the subsequent NDP frame transmissions from all base stations. This preliminary signaling ensures that all base stations are ready to transmit simultaneously at the predetermined time, enabling efficient multi-base station sounding without sequential delays
Data Source
AI summary
The present disclosure relates to a wireless base station and a terminal device that can shorten time required for sounding information collection by a plurality of wireless base stations and suppress deterioration of following accuracy. When a wireless base station as a master performs channel measurement with a terminal device, it is possible to transmit channel measurement frames in wireless base stations including the wireless base station at the same timing or at different timings only by instructing another wireless base station to perform a channel measurement, and also transmitting a Sounding Trigger frame including a transmission timing and a transmission stream of a channel measurement frame once. The present disclosure can be applied to communication systems in wireless LAN.