Frame Length Control for Stable SDMA Multiplexing
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Solution Overview
Problem
Existing communication systems face challenges in efficiently multiplexing frames of varying lengths in wireless LANs using space division multiple access, leading to unstable transmission power and auto gain control issues.
Innovation Solution
A communication apparatus and method that integrates frame length control units to adjust and pad frames, ensuring all frames are transmitted at the same length, using adaptive array antennas to optimize multiplexing and reduce transmission power fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frames of variable lengths are directly multiplexed and transmitted, then the transmission efficiency is improved, but the received power becomes unstable causing auto gain control issues
Solution Approach 1:
The patent applies preliminary action by performing frame length adjustment through padding or truncation before the frames are multiplexed and transmitted. This preprocessing ensures that all frames have uniform length prior to transmission, which maintains stable received power levels and prevents auto gain control issues while still allowing efficient multiplexing of variable-length data
2Reliability
If the lengths of frames to be multiplexed are made the same, then the auto gain control stability is improved, but the transmission overhead increases
Solution Approach 1:
The patent applies local quality by selectively padding only the necessary portions of shorter frames to match the length of the longest frame, rather than uniformly extending all frames. This targeted approach maintains the required frame length uniformity for stable auto gain control while minimizing the addition of redundant data, thus reducing transmission overhead
3Productivity
If space division multiple access is used to multiplex multiple users, then the throughput is improved, but the frame multiplexing level becomes unstable when frame lengths differ
Solution Approach 1:
The patent applies preliminary action by standardizing frame lengths through padding or truncation before the space division multiple access multiplexing process. This preprocessing step ensures that all frames have uniform length, which maintains stable frame multiplexing levels and consistent spatial resource allocation across multiple users, thereby preserving system stability while enabling high throughput
Data Source
AI summary
Even when the lengths of data items to be transmitted to users are not the same, the frames multiplexed at the same time finally have the same frame length and are transmitted. Even when the lengths of frames for the users are not the same at the time when a transmission request is received from a higher layer, a communication apparatus reconfigures at least two of the frames having short lengths into a frame having a long length through Aggregation so that the frames finally have the same frame length and transmits the frames at the same time in a multiplexed manner. On the transmitter side, the transmission power used per destination communication station can be increased due to a decrease in the total number of multiplexed frames. On the receiver side, an unstable AGC operation can be prevented.