Multiplexing Acknowledgement Codebooks with Uplink Data
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Solution Overview
Problem
Wireless communication systems face challenges in handling collisions between multiple acknowledgement transmissions and uplink data transmissions, leading to potential loss of acknowledgement information and unnecessary retransmissions due to resource overlap.
Innovation Solution
The system allows user equipment (UE) to multiplex acknowledgement codebooks with uplink data transmissions based on timing thresholds and uplink/downlink assignment indications, enabling the piggybacking of acknowledgement messages onto overlapping PUSCH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits multiple acknowledgement messages separately on PUCCH resources, then the acknowledgement information can be transmitted reliably, but the uplink data transmission resources are wasted due to collision with PUSCH
Solution Approach 1:
The patent merges multiple PUCCH-based acknowledgement transmissions with the PUSCH uplink data transmission by multiplexing the HARQ-ACK information onto the PUSCH. This is achieved by determining a set of timing thresholds and using uplink/downlink assignment indications to identify collision cases, then combining the acknowledgement codebooks with the data transmission in the time domain, thereby utilizing the PUSCH resources for both data and acknowledgement information.
Solution Approach 2:
The PUSCH transmission is made multi-functional by enabling it to carry both uplink data and acknowledgement information. The UE determines whether to multiplex based on timing thresholds and assignment indications, allowing the same physical resource to serve dual purposes: data transmission and HARQ-ACK feedback, thus improving resource utilization efficiency.
2Reliability
If the UE transmits acknowledgement messages on PUCCH resources that collide with PUSCH, then the acknowledgement can be sent, but power consumption increases due to simultaneous transmissions
Solution Approach 1:
The patent combines multiple transmission operations into a single unified transmission. Instead of transmitting acknowledgement messages on PUCCH and data on PUSCH simultaneously (which would double the power consumption), the system merges both into one PUSCH transmission that carries both data and acknowledgement information, thereby reducing the total number of active transmissions and lowering power consumption.
3Reliability
If the UE uses separate PUCCH resources for multiple acknowledgement transmissions, then the feedback can be transmitted, but resource overlap causes information loss
Solution Approach 1:
The patent prevents information loss by merging the acknowledgement codebooks with the PUSCH transmission. The UE determines timing thresholds and uses assignment indications to identify when acknowledgement transmissions would collide with PUSCH. By multiplexing the HARQ-ACK information onto the PUSCH, the system ensures that acknowledgement information is not lost due to resource overlap, as both data and feedback share the same time resource without interference.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may transmit a downlink control transmission and multiple downlink data transmissions to a user equipment (UE). The UE may schedule an uplink data transmission based on the downlink control transmission and may schedule transmission acknowledgement messages based on the multiple downlink data transmissions. The UE may identify that the scheduled uplink data transmission overlaps with the scheduled transmission acknowledgement messages. The UE may generate one or more acknowledgement codebooks for transmission of the multiple transmission acknowledgment messages and may multiplex the one or more acknowledgement codebooks with the uplink data transmission on the uplink data channel. In some cases, the UE may multiplex the codebooks based on determining that a set of timing thresholds are satisfied by an earliest of the multiple transmission acknowledgement messages and the uplink data transmission with respect to one or more downlink transmissions.