Uplink ACK/NACK and SR Multiplexing in One Symbol
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Solution Overview
Problem
Current 5G NR technology inefficiently transmits control information, particularly for short burst transmissions, requiring complex solutions to coordinate scheduling requests (SRs) and acknowledgment (ACK)/negative ACK (NACK) between base stations and user equipment.
Innovation Solution
Transmitting SR and ACK/NACK simultaneously within one symbol period using cyclically shifted sequences in allocated resources, allowing efficient control information exchange without excessive complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SR and ACK/NACK are transmitted separately in the time domain, then the control information can be transmitted using existing protocols, but the transmission efficiency is reduced and latency requirements cannot be met
Solution Approach 1:
The patent combines SR and ACK/NACK transmissions into a single uplink transmission opportunity by using different cyclic shifts of the same base sequence to encode both types of control information simultaneously, eliminating the need for separate time domain transmissions and reducing latency
Solution Approach 2:
The patent creates a universal uplink control channel that can carry both SR and ACK/NACK information through a single transmission mechanism using cyclic shift differentiation, allowing the same physical resource to serve multiple control information types
2Loss of time
If SR and ACK/NACK are transmitted in one symbol period, then latency requirements are met and resource efficiency improves, but the complexity of coordinating reception and transmission increases
Solution Approach 1:
The patent changes the cyclic shift parameter of the base sequence to encode different control information types (SR vs. ACK/NACK) and their combinations, allowing the receiver to differentiate between message types through parameter detection rather than complex protocol coordination
Solution Approach 2:
The cyclic shift acts as an intermediary encoding mechanism that translates multiple control information types into distinguishable signal variations, simplifying the coordination problem by providing automatic message differentiation through physical layer parameters
Data Source
AI summary
Systems, methods, computer-readable medium, and apparatus are disclosed that allow for control information to be provided in an efficient manner during short burst transmission. For example, an apparatus may be configured to receive downlink control information (DCI) that indicates an allocated resource from a base station. The apparatus may also receive data from the base station. The apparatus may generate a cyclically shifted sequence that corresponds to a sequence that is cyclically shifted based on at least one of an ACK or NACK for the received data and a SR. The apparatus may then transmit the cyclically shifted sequence in the allocated resource within one symbol period of a slot of a subframe to the base station. Thus, by transmitting the SR and the ACK/NACK in one symbol, control information for short burst transmissions can be provided in a more temporally efficient manner without adding excessive complexity to the UE.