Trigger-Based PPDU Channel Indication for 320+ MHz WLAN Uplink
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Solution Overview
Problem
Existing wireless LAN systems face challenges in efficiently allocating resources for physical layer protocol data units (PPDUs) within extended bandwidths exceeding 320 MHz, particularly in scenarios involving multiple access points and non-AP stations, which affect UL transmission efficiency and throughput.
Innovation Solution
A method and apparatus for transmitting and receiving a trigger-based PPDU (TB PPDU) using a trigger frame that includes user information fields with 1-bit information to indicate resource allocation within extended bandwidths, allowing efficient allocation of resource units (RUs) and multiple resource units (MRUs) to non-AP STAs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trigger frame based PPDU transmission is used in extended bandwidth exceeding 320 MHz, then UL transmission efficiency and throughput are improved, but resource allocation complexity increases
Solution Approach 1:
The user information field is divided into multiple subfields: first information (2 bits) indicating RU size and second information (3 bits) indicating RU location. This segmentation allows efficient resource allocation in extended bandwidth by breaking down the complex allocation indication into manageable components, resolving the contradiction between improved throughput and allocation complexity
Solution Approach 2:
The patent introduces a new dimension to resource allocation by using 5-bit combined information (first + second information) to indicate both size and location of RUs in extended bandwidth. This dimensional expansion enables precise control of resource allocation across larger bandwidths without proportionally increasing complexity
2Device complexity
If 1-bit information is used for channel indication in user information field, then frame structure simplicity is maintained, but channel indication precision is insufficient for extended bandwidth
Solution Approach 1:
The patent merges first information (2 bits for RU size) and second information (3 bits for RU location) into a combined 5-bit field. This merging approach maintains relative simplicity while achieving sufficient precision for channel indication in extended bandwidth scenarios, resolving the contradiction between structural simplicity and indication precision
Solution Approach 2:
The user information field is designed to serve multiple functions: indicating RU size, RU location, and channel information simultaneously. This multi-functionality allows the field to adapt to both simplified structures and precise indication requirements across different bandwidth scenarios
Data Source
AI summary
A method and apparatus for transmitting and receiving a trigger frame based PPDU in a wireless LAN system are disclosed. The method performed by a station (STA) in a wireless LAN system, according to an embodiment of the present disclosure, may comprise the steps of: receiving, from an access point (AP), a trigger frame including a user information field (user info field); and transmitting, to the AP, a trigger based (TB) physical layer protocol data unit (PPDU) triggered by the trigger frame. Here, the user information field may comprise first information and second information related to a channel indication, each of the first information and the second information may be configured with 1-bit information, and on the basis that a bandwidth for the STA is a bandwidth exceeding 320 MHz, a combination of the first information and the second information may indicate a location of a channel within the bandwidth exceeding 320 MHz, to which a resource for the TB PPDU has been allocated.