Msg3 PUSCH Repetition Control for 5G NR Uplink Coverage
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Solution Overview
Problem
In 5G NR systems, the Msg3 PUSCH (Physical Uplink Shared Channel) does not support repetitions, which limits uplink coverage enhancement, as the number of repetitions is not indicated by the Random Access Response (RAR) and RRC signaling is unavailable before the connected status is established.
Innovation Solution
A communication method and system that enables the determination of a number of repetitions for the Msg3 PUSCH, allowing for its transmission with a positive integer number of repetitions, and the network device receives these repetitions, using indication fields in RAR and DCI to determine the number and resources for transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetitions are not supported for Msg3 PUSCH, then the system complexity remains low and the random access procedure is simple, but the uplink coverage is limited and cannot be enhanced
Solution Approach 1:
The patent applies preliminary action by indicating the number of repetitions in advance through the Random Access Response (RAR) message before the Msg3 PUSCH transmission occurs. The network device sends repetition indication information in the RAR, allowing the user equipment to determine the exact number of repetitions before initiating the uplink transmission, thus preparing the repetition mechanism in advance rather than ad-hoc
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the number of repetitions based on the coverage enhancement requirements. The repetition indication information in the RAR message carries parameters that specify different repetition counts, allowing the system to adapt the transmission parameters according to the actual channel conditions and coverage needs without changing the overall system architecture
2Reliability
If repetitions are supported for Msg3 PUSCH, then the coverage enhancement is achieved, but the signaling overhead increases due to indicating the number of repetitions
Solution Approach 1:
The patent applies universality by making the Random Access Response (RAR) message serve multiple functions: it not only provides the standard random access response information but also carries the repetition indication information for Msg3 PUSCH. This multi-functional use of the existing RAR message structure avoids introducing separate dedicated signaling for repetition indication, thereby reducing overall signaling overhead
Solution Approach 2:
The patent uses copying by reusing the existing RAR message format and structure to carry additional repetition indication information. Instead of creating a completely new signaling mechanism, the solution copies and extends the functionality of the existing RAR message, leveraging its established structure to minimize the impact on system complexity and signaling overhead
3Productivity
If the number of repetitions is determined dynamically, then the communication efficiency is improved by adapting to channel conditions, but the determination complexity increases for user equipment
Solution Approach 1:
The patent implements self-service by enabling the user equipment to autonomously determine the number of repetitions based on the indication information received in the RAR message. The UE uses the received repetition indication to directly control its own transmission behavior without requiring complex external coordination or additional control signaling, thus improving efficiency while keeping the determination process straightforward
Data Source
AI summary
Embodiments of the present disclosure relate to the field of wireless communication technologies, and a communication method, a user equipment, a network device, and a computer storage medium are disclosed. The communication method includes: determining a number of repetitions of a physical uplink shared channel (PUSCH), wherein the PUSCH is a PUSCH of Msg3 in a random access procedure and the number of repetitions is a positive integer; and then transmitting the PUSCH to the network device with the number of repetitions. By using the communication method provided by an embodiment of the present disclosure, the user equipment may determine a number of repetitions for a Msg3 PUSCH (a PUSCH of Msg3), thus providing a solution for supporting the repetitions of Msg3 PUSCH and solving a critical technical problem of uplink coverage enhancement, and improving the uplink coverage range of the Msg3 PUSCH greatly.