OFDM Control Information Decoding via Symbol Count Indication
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Solution Overview
Problem
In cellular orthogonal frequency division multiplexing (OFDM) radio packet communication systems, there is a need for a method to accurately decode control information and scheduling information with a high success rate, as errors in receiving these can lead to errors in data reception, and existing systems struggle to efficiently manage the varying number of OFDM symbols for control and scheduling information transmission.
Innovation Solution
A method is introduced for receiving and transmitting control information in an OFDM system, where the number of OFDM symbols for first and second control information is determined and used for decoding, with the first control information comprising an ACK/NACK signal and the second control information comprising a physical downlink control channel, ensuring that the number of OFDM symbols for transmitting the first control information is less than or equal to that for the second, and using all possible symbols if necessary for reliable decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of OFDM symbols for transmitting control information is varied per subframe according to communication environment and information amount, then the system adapts to different conditions, but the receiver cannot accurately determine the number of symbols used, leading to decoding errors
Solution Approach 1:
The patent introduces a mediator component (control information indicator) that carries information about the number of OFDM symbols used for control information transmission. This intermediary element enables the receiver to accurately determine the symbol count without directly observing the varying transmission conditions, thus resolving the contradiction between adaptability and measurement precision.
Solution Approach 2:
The patent applies preliminary action by indicating the number of OFDM symbols for control information transmission in advance, before the actual data transmission occurs. This allows the receiver to prepare the correct decoding parameters beforehand, ensuring accurate reception even as transmission conditions vary.
2Productivity
If control information and scheduling information are transmitted using varying numbers of OFDM symbols, then resource allocation efficiency improves, but the complexity of managing and decoding multiple information types increases
Solution Approach 1:
The patent segments the control information into distinct types (control information and scheduling information) with separate indication mechanisms. By dividing the overall control information structure into manageable segments, the system maintains high resource allocation efficiency while reducing the complexity of decoding each individual information type.
3Reliability
If errors occur in receiving control information and scheduling information, then data reception errors are likely to occur, but increasing the number of OFDM symbols for control information reduces available symbols for data transmission
Solution Approach 1:
The patent applies partial action by indicating only the necessary information (number of OFDM symbols for control information) rather than transmitting redundant control data. This approach achieves sufficient reliability for control information reception while minimizing the number of symbols consumed, thereby preserving more symbols for data transmission and maintaining overall system productivity.
Data Source
AI summary
The present invention relates to receiving control information in an orthogonal frequency division multiplexing (OFDM) system of a mobile communication system. The present invention includes receiving information related to a number of OFDM symbols in a subframe for receiving first control information, receiving information related to a number of OFDM symbols in the subframe for receiving second control information, decoding the first control information according to the received information related to the number of OFDM symbols in the subframe for receiving the first control information, and decoding the second control information according to the received information related to the number of OFDM symbols in the subframe for receiving the second control information, wherein the number of OFDM symbols for receiving the first control information is less than or equal to the number of OFDM symbols for receiving the second control information.