Uplink Subframe Configuration for PUSCH Transmission in LTE
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Solution Overview
Problem
Current LTE communication systems face inefficiencies in uplink signal transmission, particularly in managing PUSCH, SRS, and PRACH signals, which affect the communication efficiency between terminal apparatuses and base station apparatuses.
Innovation Solution
The proposed solution involves a terminal apparatus and base station apparatus communication method that optimizes the use of uplink signals, including PUSCH, SRS, and PRACH, by adjusting subframe configurations and parameter settings, such as UpPtsAdd, to enhance uplink capacity and synchronization, allowing for efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PUSCH is transmitted in UpPTS of special subframe to enhance uplink capacity, then uplink capacity is improved, but subframe configuration complexity increases
Solution Approach 1:
The patent introduces dynamic adjustment of the parameter k (timing offset between PDCCH and PUSCH) based on different subframe configurations. The base station can dynamically select from multiple predefined k values (e.g., k=4, k=6, k=8) depending on the subframe type and configuration, allowing flexible adaptation to different uplink capacity requirements while maintaining clear transmission rules
Solution Approach 2:
The patent changes the timing parameter k from a fixed value to a configurable parameter that varies based on subframe configuration. By defining different k values for different scenarios (normal uplink subframes vs. special subframes with UpPTS), the system optimizes uplink capacity without creating complex ad-hoc transmission rules
2Adaptability or versatility
If dynamic TDD uplink and downlink subframe distribution is implemented, then communication flexibility is improved, but HARQ sequential relationship management becomes more complex
Solution Approach 1:
The patent segments the HARQ management into distinct cases based on subframe type: Case 1 for normal uplink subframes with fixed k values, and Case 2 for special subframes with UpPTS containing PUSCH. This segmentation allows each case to have its own simplified HARQ timing rules, avoiding the need for complex unified management of all possible scenarios
Solution Approach 2:
The patent pre-defines multiple k value options (k=4, k=6, k=8) for different subframe configurations before actual transmission occurs. The base station selects the appropriate k value in advance based on the configured subframe pattern, eliminating the need for real-time complex calculations during transmission scheduling
3Productivity
If uplink signal transmission parameters are optimized, then transmission efficiency is improved, but synchronization requirements become more stringent
Solution Approach 1:
The patent incorporates guard periods and cyclic prefixes in the UpPTS configuration to provide time margins for synchronization errors. By pre-configuring these protective time intervals, the system tolerates certain levels of synchronization deviation without causing inter-symbol interference or losing uplink timing alignment
Data Source
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AI summary
A terminal apparatus receives a random access response including a random access response grant, and transmits a PUSCH based on the random access response grant. A subframe available for PUSCH transmission corresponding to the random access response grant associated with a non-contention based random access procedure at least includes a special subframe including an added UpPTS, and a subframe available for PUSCH transmission corresponding to the random access response grant associated with a contention based random access procedure does not include a special subframe including the added UpPTS.