Uplink MIMO E-TFC Selection for Power-Limited Dual Stream Transmission
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Solution Overview
Problem
Current uplink MIMO transmission technologies in wireless communication systems are limited to single stream transmissions across two antennas, hindering the achievement of dual transport blocks in the same carrier frequency during the same transmission time interval, which restricts throughput and spectral efficiency.
Innovation Solution
The proposed solution involves an E-TFC selection process for uplink MIMO transmissions, where non-scheduled data is allocated only to the primary stream if power- or buffer-limited, and scheduled data is distributed between the primary and secondary streams based on determined transport block sizes, ensuring efficient power allocation and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single stream transmission is used across two antennas, then power allocation and transmission simplicity are maintained, but throughput and spectral efficiency are limited
Solution Approach 1:
The transmission system is segmented into two independent streams (first stream and second stream) that can be transmitted simultaneously across two antennas. Each stream has its own transport block, allowing dual transport blocks to be transmitted in the same carrier frequency during the same transmission time interval, thereby doubling the throughput while maintaining manageable complexity through structured segmentation of the transmission process
Solution Approach 2:
The system transitions from single-stream transmission to dual-stream MIMO transmission by utilizing the spatial dimension. By transmitting two streams simultaneously across two antennas in the same carrier frequency and time interval, the system achieves spectral efficiency improvement without requiring additional frequency resources, effectively adding a spatial dimension to the transmission
2Use of energy by moving object
If dual transport blocks are transmitted in the same carrier frequency, then spectral efficiency is improved, but power management complexity increases
Solution Approach 1:
The power allocation mechanism is made dynamic by allowing the E-TFC selection process to adaptively determine power levels for each stream based on real-time conditions. The system can dynamically adjust which streams receive power and at what levels, enabling flexible power management that responds to channel conditions, data availability, and quality of service requirements while supporting dual stream transmission for improved spectral efficiency
Solution Approach 2:
The system changes power transmission parameters by allowing different power levels to be applied to different streams. The E-TFC selection process determines power levels for each stream independently, enabling the system to optimize power distribution across streams based on their individual requirements, channel conditions, and the overall power available to the terminal
3Adaptability or versatility
If non-scheduled data is allocated to both streams, then data transmission flexibility is improved, but buffer management complexity increases
Solution Approach 1:
The E-TFC selection process performs preliminary action by determining the allocation of non-scheduled data to streams before the actual transmission occurs. The process evaluates buffer status and scheduled grant information in advance to determine which streams receive non-scheduled data and in what amounts, enabling flexible data allocation while managing buffer complexity through proactive planning rather than reactive management
Data Source
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AI summary
Methods and apparatuses are provided for uplink MIMO transmissions in a wireless communication system. In some particular aspects, an E-TFC selection process for selecting a transport format combination for an uplink MIMO transmission may take certain steps in the case that a UE is power- or buffer-limited. For example, in a rank 2 transmission, non-scheduled data is allocated only to the primary stream. If the allocated non-scheduled data is less than the determined primary stream transport block size, scheduled data is allocated to the primary stream in an amount not to exceed the determined primary stream TBS. Finally, scheduled data is allocated to the secondary stream in an amount not to exceed the determined secondary stream TBS.