MSG3 Repetition Across Multiple PUSCH Resources for Random Access Coverage
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Solution Overview
Problem
Existing MSG3 transmission in contention-based random access processes is limited, leading to poor performance and coverage issues, particularly when initial transmission fails.
Innovation Solution
Repeating MSG3 transmission on multiple physical uplink shared channel (PUSCH) resources, with instructions from the network device using PDCCH scrambled by RA-RNTI or TC-RNTI, to improve transmission and coverage performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MSG3 is transmitted only once on a single PUSCH resource, then the transmission process is simple and fast, but the transmission reliability and coverage are poor
Solution Approach 1:
The patent divides the MSG3 transmission into multiple segments by repeating it on multiple PUSCH resources. Instead of transmitting MSG3 once, the terminal device transmits it multiple times across different PUSCH occasions, thereby improving reliability through redundancy while managing complexity through structured repetition patterns.
Solution Approach 2:
The patent applies preliminary action by configuring the terminal device with repetition parameters in advance through RAR or DCI formats. The network device pre-configures the number of repetitions, PUSCH resource allocations, and other parameters before the actual MSG3 transmission, allowing the terminal to execute the repeated transmissions without real-time decision-making complexity.
2Reliability
If MSG3 is repeatedly transmitted on multiple PUSCH resources, then transmission performance and coverage are improved, but transmission delay increases
Solution Approach 1:
The patent introduces dynamic control of MSG3 repetition through network device instructions. The network can dynamically adjust the number of repetitions, PUSCH resource allocations, and transmission timing based on channel conditions and network load. This dynamic approach allows the system to optimize between reliability and delay by adapting repetition levels to actual transmission needs rather than using fixed repetition counts.
Solution Approach 2:
The patent changes key transmission parameters including the number of repetitions, PUSCH resource allocations, modulation and coding schemes (MCS), and power levels. By adjusting these parameters based on channel quality and network conditions, the system can achieve reliable transmission with minimal delay - using higher repetitions only when necessary while using fewer repetitions or single transmission when channel conditions are good.
3Adaptability or versatility
If MSG3 repetition is configured through detailed RAR or DCI formats, then transmission control is precise, but signaling overhead increases
Solution Approach 1:
The patent makes existing RAR and DCI formats multi-functional by extending them to carry both traditional random access control information and new MSG3 repetition configuration parameters. The same RAR or DCI format structures are used to convey uplink grants, timing advance, and now additionally repetition counts, resource allocations, and other MSG3-specific parameters, thereby avoiding the need for separate dedicated signaling messages.
Solution Approach 2:
The patent reuses and adapts existing message formats (RAR and DCI) rather than creating entirely new signaling structures. By copying and extending the functionality of these established formats, the patent minimizes signaling overhead while maintaining the ability to convey comprehensive MSG3 repetition control information. The existing format structures are leveraged to reduce the learning curve and implementation complexity.
Data Source
AI summary
A method for transmitting MSG3 includes: receiving MSG3 repetition on multiple PUSCH resources. Before receiving the MSG3 repetition on the multiple PUSCH resources, the method further includes: sending indication information, where the indication information is used for instructing a terminal device to perform the MSG3 repetition on the multiple PUSCH resources; and the indication information is comprised in at least one of: UL grant in a RAR; or a PDCCH scrambled by a TC-RNTI. Before receiving the MSG3 repetition on the multiple PUSCH resources, the method further includes: sending configuration information, where the configuration information is used for configuring at least one of: the number of times for the MSG3 repetition; or a MCS table configuration for the MSG3 repetition.