Wireless Control Channel Transmission with Variable OFDM Symbols
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting and receiving control information between user equipment (UE) and base stations, particularly in simultaneously supporting UEs located in different beam directions.
Innovation Solution
The method involves transmitting and receiving control channels with different OFDM symbol lengths compared to data channels, using different FFT sizes and cyclic prefix lengths, allowing for time division of control channels and enabling transmission to UEs in various beam directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the OFDM symbol length for control channel is made different from data channel, then control information can be transmitted to UEs in different beam directions simultaneously, but the system complexity increases due to multiple FFT sizes and cyclic prefix lengths
Solution Approach 1:
The patent segments the transmission time into distinct data periods and control periods, with data channels using one OFDM symbol length and control channels using a different OFDM symbol length. This temporal segmentation allows the system to maintain multiple FFT sizes and cyclic prefix lengths without requiring simultaneous processing of multiple configurations, thereby reducing implementation complexity while achieving the ability to transmit control channels to UEs in different beam directions
Solution Approach 2:
The patent introduces dynamic switching between different OFDM symbol lengths for data and control channels. The system dynamically adjusts the FFT size and cyclic prefix length based on whether the current transmission period is a data period or a control period, enabling adaptability for different beam directions while managing complexity through time-varying parameters rather than static multi-configuration support
2Productivity
If control channel is transmitted during dedicated control period with different FFT size, then transmission efficiency to multiple UEs improves, but latency may increase due to separate control period allocation
Solution Approach 1:
The patent implements periodic alternation between data periods and control periods within a subframe structure. Control channels are transmitted in dedicated control periods that occur periodically, allowing efficient batch transmission of control information to multiple UEs using optimized FFT sizes. The periodic structure ensures that while control transmission is separated, it occurs at regular intervals, managing latency through predictable timing rather than continuous interference
Data Source
AI summary
Disclosed are a method for transmitting and receiving, between a terminal and a base station, a control channel including control information, and a device for supporting the same. Particularly, disclosed in the present invention are: a method for transmitting and receiving a control channel, if a subcarrier spacing or fast Fourier transform (FFT) size of the control channel including control information is different from the subcarrier spacing or FFT size of a data channel including data; and a device for supporting the same.