Communication Device Schedule Information for Low Latency
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Solution Overview
Problem
Existing communication technologies, such as those based on the IEEE802.11ax standard, face challenges in achieving ultra-reliable low latency communications (URLLC) due to significant signaling overhead and inefficiencies in resource unit allocation, particularly in multi-user scenarios, which hinder fast alternation between downlink and uplink transmissions and efficient frequency, spatial, and temporal diversity.
Innovation Solution
A communication system that generates and transmits schedule information for multiple time slots, assigning specific resource units to each communication device, reducing signaling overhead by allowing each STA to use different resource units across time slots, and employing a continuation trigger for efficient switching between downlink and uplink transmissions, enabling frequency-hopping, spatial-hopping, and low-latency automatic repeat request (ARQ) feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trigger-based PPDU transmission is used for uplink multi-user communication, then simultaneous data transmission from multiple STAs is enabled, but signaling overhead increases significantly
Solution Approach 1:
The AP pre-allocates resource units to multiple STAs in advance and announces the allocation in a downlink PPDU before the uplink transmission. This preliminary resource assignment eliminates the need for complex trigger-based signaling during the uplink phase, reducing signaling overhead while enabling simultaneous transmissions from multiple STAs.
Solution Approach 2:
The patent extracts the resource allocation signaling from the trigger-based uplink PPDU and places it in the downlink PPDU. By separating the allocation announcement from the actual uplink transmission trigger, the system reduces the signaling burden in the uplink direction while maintaining multi-user capability.
2Adaptability or versatility
If frequent trigger frames are sent for each time slot, then real-time resource allocation is achieved, but transmission latency increases
Solution Approach 1:
The patent merges multiple resource allocation announcements into a single downlink PPDU that serves multiple upcoming time slots. Instead of sending separate trigger frames for each time slot, the AP consolidates the resource unit assignments in one preliminary announcement, reducing the number of signaling events and minimizing transmission latency while maintaining real-time allocation capability.
3Reliability
If channel sounding is performed for precoding in MU-MIMO, then spatial multiplexing performance is improved, but communication latency increases
Solution Approach 1:
The patent performs channel sounding and precoder determination in advance during the downlink phase, before the actual uplink data transmission. By completing the channel characterization and precoding setup beforehand, the system achieves accurate spatial multiplexing performance without adding latency during the critical uplink transmission phase.
Data Source
AI summary
A first communication device comprises circuitry configured to simultaneously communicate with a group of two or more second communication devices. The circuitry is configured to generate schedule information that schedules, for two or more subsequent time slots, the assignment of different resource units to the second communication devices of the group of second communication devices to indicate, per time slot or per group of time slots, which second communication device of the group shall use which resource unit for data transmission, transmit the schedule information to the group of second communication devices, and receive data in subsequent time slots from second communication devices of the group that use the resource units according to the assignment scheduled by the schedule information for data transmission.