Multicast Unicast Resource Unit Allocation
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Solution Overview
Problem
In wireless communication systems, the low transmission rate of multicast frames can lead to long occupancy durations of the air interface, causing delays in unicast frame transmissions and channel congestion, especially when the receiver of the unicast frame is included in the multicast group.
Innovation Solution
Simultaneously transmitting multicast and unicast frames over different resource units, with the unicast frame being excluded from the multicast group, allowing for separate resource allocation and transmission without delay, ensuring a specified transmission rate for the multicast frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast frames are transmitted at a low transmission rate to ensure reliability, then the transmission reliability is improved, but the air interface occupancy duration increases causing channel congestion and reduced productivity
Solution Approach 1:
The patent segments the transmission resources by dividing the air interface into different resource units (RUs), allowing multicast frames to be transmitted in a dedicated first RU while unicast frames use a second RU. This segmentation enables parallel transmissions at different rates without mutual interference, resolving the contradiction between reliable multicast transmission and overall channel efficiency.
2Reliability
If multicast frames occupy the air interface for a long duration to ensure complete reception by all group members, then the reliability for multicast delivery is improved, but unicast frame transmissions are delayed reducing system productivity
Solution Approach 1:
The patent introduces a new dimension of resource allocation by using different resource units (frequency or time resources) for multicast and unicast transmissions. Instead of extending multicast transmission duration in the time dimension, the system allocates multicast frames to a first RU and unicast frames to a second RU, enabling simultaneous transmissions without temporal conflict and eliminating unicast delays.
3Device complexity
If the same resource units are used for both multicast and unicast frames, then device complexity is reduced, but transmission confusion occurs reducing reliability
Solution Approach 1:
The patent segments the resource units into at least two distinct RUs: a first RU for multicast frames and a second RU for unicast frames. This segmentation prevents transmission confusion by ensuring that multicast and unicast frames do not occupy the same resources simultaneously, thereby maintaining high transmission reliability while keeping the allocation scheme relatively simple through clear resource separation.
Data Source
AI summary
An example network device may include a processor to assign resource units (RUs) for a multicast frame and a unicast frame, wherein the assigned RUs include a first RU corresponding to the multicast frame and a second RU corresponding to the unicast frame, and wherein a client device corresponding to the unicast frame is excluded in a subset of client devices corresponding to the multicast frame; and transmit the multicast frame and the unicast frame in a same duration by the first RU and the second RU, respectively.