Uplink Control Channel Resource Allocation via Data Channel Reference
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Solution Overview
Problem
In wireless communication systems, especially in LTE/LTE-Advanced, the concurrent transmission of uplink control information (UCI) with data on the Physical Uplink Shared Channel (PUSCH) faces challenges due to uncertainty in transmission reliability and power management issues, as UCI transmission requires stringent block error rate (BLER) compliance, which is difficult to achieve efficiently.
Innovation Solution
A method for data channel-referenced resource allocation for a control channel, where the UE determines an uplink resource allocation for a control channel adjacent to the data channel, allowing for improved power management and transmission reliability by piggybacking the control channel on the data channel, using waveforms like DFT-S-OFDM or CP-OFDM, and optimizing resource allocation based on the data channel's allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UCI is transmitted concurrently with data on PUSCH, then transmission efficiency is improved, but transmission reliability becomes uncertain and power management becomes difficult
Solution Approach 1:
The patent segments the uplink transmission by separating control channel (PUCCH) and data channel (PUSCH) transmissions in the frequency domain. The control channel is allocated to first frequency resources while data is allocated to second frequency resources, allowing independent optimization of transmission parameters for each channel type, thereby maintaining reliability for control information while achieving efficient data transmission.
Solution Approach 2:
The patent transitions from time-division multiplexing to frequency-division multiplexing for separating control and data channels. By allocating control and data to different frequency resources within the same transmission time interval, the system achieves concurrent transmission without compromising control channel reliability, thus resolving the contradiction between efficiency and reliability.
2Reliability
If UCI is transmitted on PUCCH with concurrent data transmission, then control information is delivered reliably, but power amplifier performance deteriorates due to large power variations
Solution Approach 1:
The patent segments the frequency spectrum into distinct regions for control channel and data channel transmissions. The control channel occupies first frequency resources while data occupies second frequency resources, allowing the power amplifier to handle each channel with appropriate power levels independently, reducing overall power variations and improving amplifier performance.
Solution Approach 2:
The patent applies different transmission characteristics to different frequency regions. The control channel region is optimized for reliable control information delivery with appropriate power allocation, while the data channel region is optimized for efficient data transmission. This local optimization reduces the need for high peak power and improves power amplifier efficiency.
3Productivity
If UCI is multiplexed with data on PUSCH, then resource utilization is improved, but transmission reliability becomes uncertain
Solution Approach 1:
The patent segments frequency resources into separate allocations for control and data channels, allowing both to be transmitted concurrently with full resource utilization. The control channel gets dedicated frequency resources ensuring reliable delivery, while data channels utilize remaining frequency resources efficiently, achieving both high resource utilization and maintained reliability.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described for a data channel-referenced resource allocation for a control channel. In an implementation, a user equipment (UE) may identify, for a transmission time interval (TTI), a first uplink resource allocation to the UE of a first channel. The UE may determine, based at least in part on the first uplink resource allocation of the first channel, a second uplink resource allocation of a second channel to the UE. The UE may transmit, during the TTI, the first channel and the second channel.