Service Field Bandwidth Mode Indication for 802.11be Negotiation
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Solution Overview
Problem
The introduction of bandwidth modes beyond 20 MHz, 40 MHz, 80 MHz, and 80+80 MHz in the 802.11be standard poses a challenge for negotiating compatible bandwidth modes between transmit and receive ends in wireless communication.
Innovation Solution
A method and apparatus that utilize the service field of non-HT frames to indicate target bandwidth modes using at least one bit without increasing or decreasing the bit count, allowing negotiation of additional bandwidth modes like 320 MHz by setting specific preset values in the first field, and optionally using additional bits for detailed channel availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the service field bit assignment is extended to indicate new bandwidth modes (320 MHz), then the bandwidth mode indication capability is improved, but the frame structure complexity increases
Solution Approach 1:
The existing service field bits (B5-B7) are made multi-functional by introducing a first field that indicates whether these bits represent traditional bandwidth modes or new bandwidth modes. This allows the same bits to serve both traditional 802.11ac bandwidth indication and new 802.11be extended bandwidth indication without requiring additional bits.
Solution Approach 2:
The interpretation of the service field bits is changed dynamically based on the value of the first field. When the first field indicates extended bandwidth mode support, the bits B5-B7 are reinterpreted to represent bandwidth modes beyond 160 MHz (such as 320 MHz), effectively changing the parameter mapping without adding physical bits.
2Adaptability or versatility
If additional bits are added to indicate extended bandwidth modes, then the bandwidth mode negotiation capability is improved, but the backward compatibility deteriorates
Solution Approach 1:
The first field acts as a universal indicator that enables both legacy and extended bandwidth mode indications within the same frame structure. Legacy devices ignore the first field and interpret B5-B7 as traditional bandwidth modes, while extended devices use the first field to determine the correct interpretation, ensuring both can coexist.
Solution Approach 2:
The first field is set in advance to indicate whether extended bandwidth mode indication is supported before the actual bandwidth negotiation occurs. This preliminary indication allows receiving devices to prepare the correct interpretation mode, preventing misinterpretation and ensuring smooth backward compatibility.
3Ease of manufacture
If reserved bits in MAC frames are used for bandwidth indication, then the frame structure modification is simplified, but the chip vendor private indication capability is interfered with
Solution Approach 1:
The bandwidth indication function is extracted from the MAC frame reserved bits and placed in the service field, which is specifically designed for physical layer control information. This separation allows MAC frame reserved bits to remain available for chip vendor private indications while the service field handles bandwidth mode indication.
Solution Approach 2:
The service field acts as an intermediary layer between the physical layer and MAC layer, providing a dedicated space for bandwidth mode indication without interfering with MAC frame structure or chip vendor reserved bit usage. This intermediary approach resolves the conflict between bandwidth indication needs and vendor private usage rights.
Data Source
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AI summary
A bandwidth mode indication method and apparatus are provided, and relate to the field of communication technologies. The method includes: A transmit end sends a first frame to a receive end, where the first frame includes a service field, the service field includes a first field, the first field indicates whether a bandwidth mode indication field carried in the first frame is allowed to indicate a target bandwidth mode, and the target bandwidth mode includes one or more of bandwidth modes other than 20 MHz, 40 MHz, 80 MHz, and 80+80 MHz or 160 MHz. Therefore, in a scenario in which a new bandwidth mode is introduced, two devices can negotiate a bandwidth mode based on the first frame according to the technical solutions provided in this application.