Wireless Transmission Control Fields Balanced to Reduce Signaling Overhead
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Solution Overview
Problem
The challenge in wireless communication systems is to achieve flexible frequency scheduling while minimizing the overhead for reporting control signaling, particularly in IEEE 802.11ax HE WLAN systems, where increased flexibility leads to higher signaling overhead.
Innovation Solution
A transmission apparatus generates a transmission signal with a non-legacy preamble comprising two channel fields, each carrying resource unit and per-user allocation information, and relocates a portion of the user-specific field from one channel field to another to balance their lengths, reducing the number of symbols needed for signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flexibility in frequency scheduling is increased, then resource allocation efficiency is improved, but overhead for reporting control signaling increases
Solution Approach 1:
The control signaling is segmented into two separate channel fields (first channel field and second channel field) that are located in different frequency subbands. Each channel field contains a common field and a user-specific field, allowing the signaling to be distributed across multiple segments rather than concentrated in a single field, thereby reducing the overhead in any single location while maintaining overall flexibility.
Solution Approach 2:
The patent introduces a frequency dimension by placing the two channel fields in different frequency subbands. This dimensional separation allows control signaling to be distributed across the frequency spectrum, enabling flexible frequency scheduling while reducing the overhead burden on any single frequency channel.
2Adaptability or versatility
If more signaling bits are used to report control signaling, then flexibility in frequency scheduling is improved, but overhead for reporting control signaling increases
Solution Approach 1:
The user-specific field is divided and distributed across two channel fields. Each channel field contains a portion of the user-specific information, allowing the system to maintain adaptability and versatility in frequency scheduling while spreading the signaling bits across multiple segments, thereby reducing the overhead concentration and improving efficiency.
Solution Approach 2:
By distributing user-specific fields across different frequency subbands, the patent adds a frequency dimension to the signaling structure. This enables more flexible frequency scheduling options without requiring a proportional increase in total signaling overhead, as the information is efficiently packed across the frequency spectrum.
3Ease of operation
If channel fields are unbalanced in length, then more padding bits are required, but overhead for reporting control signaling increases
Solution Approach 1:
The patent acknowledges and utilizes the asymmetry between the two channel fields, where one channel field may be longer than the other before padding. Instead of forcing symmetry, the system allows asymmetric channel field lengths and relocates parts of the user-specific field to balance them, reducing the need for excessive padding bits while maintaining operational simplicity.
Solution Approach 2:
The patent implements a dynamic approach where the allocation of user-specific fields between the two channel fields can be adjusted based on their relative lengths. This dynamic relocation of signaling bits allows the system to adapt to different channel field configurations, minimizing padding requirements and reducing overall overhead while maintaining ease of operation.
Data Source
AI summary
An transmission apparatus of the present disclosure comprises a transmission signal generator which, in operation, generates a transmission signal that includes a legacy preamble, a non-legacy preamble and a data field, wherein the non-legacy preamble comprises a first signal field and a second signal field, the second signal field comprising a first channel field and a second channel field, each of the first channel field and the second channel field comprising a common field that carries resource unit allocation information and a user-specific field that carries per-user allocation information for one or more terminal stations, and wherein a part of the user-specific field of one of the first channel field and the second channel field whichever is longer than the other channel field in length before appending padding bits is relocated to the other channel field; and a transmitter which, in operation, transmits the generated transmission signal.