PUCCH Resource Positioning for PUSCH Intermodulation Reduction
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Solution Overview
Problem
The simultaneous transmission of PUSCH and PUCCH in wireless communication systems often results in intermodulation products due to non-linearities in transmitters, leading to spectrum re-growth and the need for high power backoff, especially when their frequency allocations are far apart, which can lead to inefficient resource allocation and power scenarios.
Innovation Solution
The PUCCH resource structure is moved to be neighboring the PUSCH resource structure in both time and frequency domains, allowing for simultaneous transmission without frequency gaps and reducing intermodulation products, thereby minimizing the need for power backoff and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH and PUSCH frequency allocations are far apart, then frequency diversity is achieved, but intermodulation products occur due to non-linearities in transmitters
Solution Approach 1:
The PUCCH resource structure is dynamically moved from its semi-static configured position at band edges to a new position adjacent to the scheduled PUSCH resource. This dynamic repositioning allows the system to adapt to each scheduling instance, placing PUCCH and PUSCH at neighboring frequencies for simultaneous transmission, thereby eliminating frequency gaps that cause intermodulation products while maintaining the ability to achieve frequency diversity through the dynamic nature of the resource allocation.
Solution Approach 2:
The frequency position parameter of the PUCCH resource structure is changed from a semi-static configured value to a dynamically determined value based on the scheduled PUSCH resource. By changing this parameter to be adjacent to PUSCH, the system reduces the frequency separation between channels, which minimizes intermodulation products generated by power amplifier non-linearities while still allowing frequency diversity to be achieved through the dynamic scheduling process.
2Object-generated harmful factors
If PUCCH resource structure is moved adjacent to PUSCH, then intermodulation products are reduced, but resources marked by ??? cannot be addressed
Solution Approach 1:
The network node performs preliminary scheduling by determining the PUSCH resource allocation first, then uses this information to determine the appropriate PUCCH resource structure position adjacent to it. This preliminary action approach allows the system to proactively allocate both resources in a coordinated manner, ensuring that the PUCCH resource is positioned to minimize intermodulation products while the network maintains full control over resource allocation flexibility through the scheduling decision process.
3Reliability
If PUCCH is placed at semi-static configured resources at band edges, then frequency diversity is achieved, but large power backoff is necessary due to intermodulation products
Solution Approach 1:
The system transitions from a static PUCCH resource configuration at band edges to a dynamic configuration where PUCCH is repositioned adjacent to the scheduled PUSCH resource. This dynamic approach allows the system to eliminate large frequency gaps that cause intermodulation products, thereby reducing the power backoff requirement. Frequency diversity is maintained through the dynamic nature of the resource allocation, as each transmission can utilize optimal frequency positioning based on the scheduled PUSCH resource.
Data Source
AI summary
This disclosure pertains to a method for operating a user equipment (10), UE, in a radio access network. The method comprises transmitting signaling on a Physical Uplink Control CHannel, PUCCH, resource structure and on a Physical Uplink Shared Channel, PUSCH, resource structure. The PUCCH resource structure covers a PUCCH time interval and a PUCCH frequency interval, and the PUSCH resource structure covers a PUSCH time interval and a PUSCH frequency interval. The PUSCH time interval is longer than the PUCCH time interval. Further, the PUCCH resource structure is neighbored in frequency domain by the PUSCH resource structure at least for a part of the PUCCH time interval and the PUCCH resource structure is neighbored in time domain by a further PUCCH resource structure or the PUSCH resource structure. The disclosure also pertains to related devices and methods.