PPDU Resource Allocation Excluding Unavailable Channels
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Solution Overview
Problem
In WLAN systems, the challenge of indicating resource unit allocation when unavailable channels exist due to radar signals or licensed channels, leading to interference and inefficiencies in bandwidth utilization.
Innovation Solution
The method involves indicating unavailable channels through a PPDU, using a channel bitmap in a beacon frame to prevent transmission on these channels, and optimizing resource allocation information to reduce overheads by excluding unavailable channel data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource allocation information includes all channels (including unavailable channels) to ensure complete coverage, then channel allocation completeness is improved, but PPDU overhead increases
Solution Approach 1:
The patent extracts and removes resource allocation information for unavailable channels from the PPDU. The transmitter determines which channels are unavailable (e.g., due to radar signals or licensed channel occupancy) and excludes resource allocation information for these channels from the transmitted PPDU, while still maintaining complete channel allocation coverage for available channels.
2Productivity
If transmission occurs on unavailable channels to maximize bandwidth utilization, then bandwidth efficiency is improved, but interference to radar or authorized users increases
Solution Approach 1:
The patent performs preliminary identification of unavailable channels before transmission. The transmitter determines which channels are unavailable (e.g., channels with radar signals or licensed channel occupancy) in advance, and this information is used to construct the PPDU with excluded resource allocation information for those channels, preventing interference before it occurs.
3Loss of information
If resource allocation information is optimized to exclude unavailable channels to reduce overhead, then PPDU overhead is reduced, but complexity in determining available channels increases
Solution Approach 1:
The patent introduces channel availability determination as an intermediary process between channel identification and resource allocation. The transmitter uses this intermediary step to identify unavailable channels (through detection of radar signals or licensed channel occupancy) and construct the PPDU accordingly, managing the complexity through a structured intermediate process.
Data Source
AI summary
In a method, a PPDU is generated, where the PPDU includes resource allocation information, and the resource allocation information is related to a channel bitmap in a beacon frame; and the PPDU is sent. According to the resource allocation indication method and apparatus provided in the embodiments of this application, an unavailable channel is indicated through an indication of the PPDU, so that a receive end can be prevent from performing transmission on the unavailable channel.