PUCCH Multiplexing for Carrier Aggregation Control Signaling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting accurate channel state information (CSI) for carrier aggregation, CoMP, and eICIC due to limited PUCCH resources and collisions between ACK/NACK and CSI reports, which restricts the capacity and flexibility of uplink control signaling.
Innovation Solution
The method involves determining whether multiple feedback signals, such as CSI and ACK/NACK, are to be simultaneously transmitted and jointly encoding them using a selected reference signal resource with an indication, allowing for efficient multiplexing and transmission, thereby overcoming resource limitations and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple feedback signals (CSI and ACK/NACK) are transmitted separately using dedicated PUCCH resources, then the reliability of individual control signals is maintained, but the PUCCH resource capacity is exceeded and signal collisions occur
Solution Approach 1:
The patent combines multiple feedback signals (ACK/NACK and CSI) into a single PUCCH transmission by multiplexing them on the same time-frequency resources. The ACK/NACK bits are mapped to specific resource elements while CSI is transmitted in the remaining resource elements, allowing both signals to coexist without requiring separate dedicated resources, thus resolving the resource capacity limitation while maintaining transmission reliability
Solution Approach 2:
The PUCCH resource is designed to serve multiple functions simultaneously by carrying both ACK/NACK feedback and CSI reports. The same physical uplink control channel resources are made multi-functional, allowing the system to transmit different types of control information on a unified resource structure, thereby increasing resource utilization efficiency without sacrificing signal reliability
2Reliability
If PUCCH resources are allocated for ACK/NACK transmission, then acknowledgment feedback is ensured, but CSI report transmission capacity is reduced leading to collisions
Solution Approach 1:
The patent utilizes the resource element dimension within the PUCCH transmission to accommodate multiple signal types. By mapping ACK/NACK and CSI to different resource elements within the same physical channel structure, the system effectively adds a dimensional layer of multiplexing that allows both signals to coexist without competing for separate time-frequency resources, thus maintaining ACK/NACK reliability while preserving CSI transmission capacity
3Reliability
If dedicated PUCCH resources are assigned for each control signal, then signal transmission reliability is maintained, but system flexibility and spectral efficiency are reduced
Solution Approach 1:
The patent implements dynamic resource sharing within the PUCCH structure, where the allocation of resource elements between ACK/NACK and CSI can be flexibly adjusted based on the actual transmission requirements. This dynamic multiplexing approach allows the system to adapt to varying control signal loads while maintaining reliable transmission, thereby increasing system flexibility without compromising transmission reliability
Data Source
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AI summary
A method for UL control signaling for carrier aggregation, CoMP and/or elCIC is disclosed. The method includes determining whether multiple FB (such as, a plurality of FB each for one channel of a multiple of channels, a plurality of FB regarding one channel (CSI, A/N, etc.), etc. for example) is to be simultaneously transmitted. The multiple FB are related to at least one CA, CoMP and/or elCIC transmission. A RS resource for an UL control signal message is selected. The RS resource includes an indication that the multiple FB is present in the UL control signal message. The method jointly encodes the multiple FB. The UL control signal message including the indication and the jointly encoded multiple FB is transmitted from a UE to a network element. Apparatus and computer readable media are also disclosed.