Uplink Control Information Code Rate Segmentation
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Solution Overview
Problem
In conventional LTE systems, calculating the code rate for CQI/PMI or rank indication during re-transmission using the total number of data symbols leads to unstable transmission, and the truncated control bits in re-transmitted signals result in degraded performance due to the lack of combined decoding/demodulation for control and data signals.
Innovation Solution
A method for transmitting control information through a physical uplink shared channel (PUSCH) without data, where the code rate is compensated using an offset that can be adjusted by the eNB, and the original control data is reused to stabilize the transmission of CQI/PMI or rank indication, allowing accurate calculation of the number of transmitted symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the code rate is calculated using the total number of data symbols during re-transmission, then the transmission resources are utilized, but the code rate for control information becomes unstable and transmission performance degrades
Solution Approach 1:
The patent segments the code rate calculation into separate components: a first code rate for data symbols and a second code rate for control information symbols. This segmentation allows each component to be calculated independently based on its specific symbol count, preventing the instability that occurs when using total symbol counts. The eNB can then adjust each code rate separately to optimize both resource utilization and transmission stability.
Solution Approach 2:
The patent introduces dynamic code rate adjustment where the eNB can independently modify the first code rate and second code rate based on transmission conditions. This dynamic adjustment capability allows the system to adapt to varying channel conditions and optimize performance for each signal type separately, resolving the contradiction between resource utilization and transmission stability.
2Device complexity
If truncated control bits are used in re-transmitted signals, then the signal structure is simplified, but the decoding performance deteriorates due to lack of combined decoding
Solution Approach 1:
The patent extracts the control information symbols from the data symbols, treating them as separate entities with dedicated code rate calculation. This extraction prevents truncation of control bits and enables independent decoding optimization. By separating control information from data, the system maintains full control bit integrity while simplifying the decoding process through separate code rate allocation.
Solution Approach 2:
The patent changes the parameter approach by introducing separate code rate parameters (first code rate for data, second code rate for control) instead of using a single unified code rate. This parameter change allows the system to optimize decoding performance for control information without simplifying the signal structure, as each parameter can be independently adjusted based on channel conditions.
3Ease of manufacture
If the original control data is not reused, then the transmission process is simpler, but the code rate cannot be accurately calculated leading to performance degradation
Solution Approach 1:
The patent applies preliminary action by reusing the original control data before the re-transmission process. This preliminary reuse ensures that the control information is available and can be accurately counted when calculating the second code rate. By preparing the control data in advance and maintaining it separately, the system achieves accurate code rate calculation without complicating the overall transmission process.
Data Source
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AI summary
A method and device for transmitting a first and second uplink signal, each having data and control information is provided. The method includes channel encoding the control information of the second uplink signal based on a number of symbols of control information to produce. The channel encoding includes determining the number of symbols in accordance with a payload size of the data of the first uplink signal and a total number of transmissible symbols of a Physical Uplink Shared Channel (PUSCH) of the first uplink signal.