Random Access UL Grant Signaling for Low-Latency PUSCH
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, face challenges in improving latency and energy efficiency in random access procedures due to ambiguity in the inclusion of uplink grants and potential inefficiencies in current UL scheduling methods.
Innovation Solution
Incorporating an uplink grant in the downlink control information scheduling a random access response message, allowing the wireless device to refrain from acknowledging the grant and transmit the subsequent physical uplink shared channel transmission based on successful decoding, and enabling the network device to receive the transmission in the identified resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device transmits an acknowledgement for the UL grant in the random access procedure, then the network can confirm successful reception, but the latency and energy consumption increase
Solution Approach 1:
The patent extracts the UL grant from a separate subsequent message and incorporates it directly into the random access response message. This allows the wireless device to receive the UL grant without needing to transmit a separate acknowledgement, thereby reducing latency and energy consumption while maintaining reliable grant delivery through the integrated message structure
Solution Approach 2:
The patent merges the UL grant indication with the random access response message into a single transmitted message. This combination eliminates the need for separate acknowledgement transmissions, reducing the number of message exchanges and improving both latency and energy efficiency while preserving the reliability of grant delivery
2Reliability
If the wireless device transmits an acknowledgement for the random access procedure message, then the network can confirm successful reception, but the energy consumption increases
Solution Approach 1:
The patent extracts the UL grant from subsequent messages and includes it in the random access response, allowing the device to obtain scheduling information without additional energy-consuming transmissions. The device can determine successful reception and proceed with PUSCH transmission based on the integrated grant information
Solution Approach 2:
The patent provides the UL grant in advance within the random access response message itself, before the device would need to transmit separate acknowledgements. This preliminary inclusion of scheduling information allows the device to prepare for PUSCH transmission without additional energy-consuming confirmation steps
Data Source
AI summary
The apparatus may be a wireless device configured to receive, in a message of a random access procedure, an indication of an UL grant for a subsequent PUSCH transmission, refrain from transmitting an acknowledgement relating to the UL grant and the message of the random access procedure, and transmit, based on a successful decoding of the UL grant, the subsequent PUSCH transmission. In some examples, the apparatus may be a network device configured to transmit, in a message of a random access procedure, an indication of an UL grant for a subsequent PUSCH transmission, and receiving the subsequent PUSCH transmission in a set of resources identified in the UL grant.