PUSCH Repetitions for Initial Access in 5G Random Access
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Solution Overview
Problem
Current communication systems, particularly in 5G networks, do not support repetitions for Physical Uplink Shared Channel (PUSCH) transmissions scheduled by DCI format 0_0 with CRC scrambled by C-RNTI, limiting the ability to perform PUSCH transmissions with repetitions for RRC setup complete messages and UE capability information reports during initial access.
Innovation Solution
The system allows a User Equipment (UE) to transmit uplink control information indicating a capability or request to perform PUSCH transmissions with repetitions, using PUCCH formats 0 or 1, with specific modulation and cyclic shift patterns, to schedule PUSCH transmissions with repetitions even when DCI format 0_0 is used with CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI, enabling support for PUSCH repetitions before RRC reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUSCH transmissions with repetitions are supported for DCI format 0_0 with CRC scrambled by C-RNTI, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The UE transmits uplink control information before the random access procedure completes, indicating its capability to perform PUSCH transmissions with repetitions. This preliminary indication allows the base station to configure repetitions in advance without requiring complex real-time capability negotiation, thus improving reliability while managing complexity through advance preparation.
Solution Approach 2:
The base station receives uplink control information from the UE indicating capability or request for PUSCH repetitions, and responds with downlink control information scheduling the repetitions. This feedback mechanism enables reliable configuration of repetition transmissions while maintaining system complexity manageable through standardized protocol exchanges.
2Productivity
If PUSCH transmissions with repetitions are enabled during initial access, then communication efficiency is improved, but loss of time increases
Solution Approach 1:
The UE indicates its capability for PUSCH repetitions with repetitions in the uplink control information transmitted during the random access procedure. This preliminary capability indication eliminates the need for time-consuming capability negotiation phases later, allowing repetitions to be configured and executed efficiently during initial access without significant time loss.
Solution Approach 2:
By enabling PUSCH transmissions with repetitions during the initial access phase itself, the system continues useful communication actions without interruption. The repetitions are scheduled and executed continuously rather than requiring separate setup phases, maintaining communication efficiency while minimizing idle time.
3Adaptability or versatility
If uplink control information includes capability indication for PUSCH repetitions, then adaptability is improved, but device complexity increases
Solution Approach 1:
The capability indication for PUSCH repetitions is merged with the existing uplink control information structure. Rather than adding a separate complex capability negotiation mechanism, the system combines the repetition capability indication with standard control information formats, improving adaptability while minimizing additional device complexity through integration.
Solution Approach 2:
The uplink control information serves multiple functions: it conveys HARQ acknowledgment, indicates UE capability for PUSCH repetitions, and triggers appropriate base station actions. This multi-functionality improves system adaptability to different transmission scenarios without requiring separate dedicated capability signaling mechanisms, thus avoiding excessive device complexity.
Data Source
AI summary
The disclosure relates to an apparatus configured to: transmit, to a base station, uplink control information indicating successful completion of a random access procedure and a capability or request to perform a physical uplink shared channel transmission with repetitions following the successful completion of the random access procedure; receive, from the base station, downlink control information scheduling the physical uplink shared channel transmission with repetitions; and perform (904) the physical uplink shared channel transmission with repetitions.