Uplink UCI Multiplexing With Message Repetition for Random Access
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Solution Overview
Problem
Random access procedures in wireless communication systems often result in collisions due to contention among multiple devices, leading to unreliable transmissions and increased latency, particularly in scenarios with high demand for mobile broadband access.
Innovation Solution
The solution involves transmitting uplink control information (UCI) in conjunction with uplink messages, utilizing message repetitions to enhance reliability and coverage during random access procedures, with a base station allocating a second slot for message retransmissions and providing a scaling factor for coding rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If message repetitions are allocated for uplink traffic transmissions, then reliability and coverage are improved, but resource overhead and system complexity increase
Solution Approach 1:
The patent makes the PUCCH resource indicator field in DCI format 0_0 multi-functional: it can indicate either PUCCH resources for UCI transmission or PUSCH resources for message repetition, depending on the random access procedure state. This universal field usage eliminates the need for separate signaling mechanisms, improving reliability through message repetitions while avoiding additional system complexity
Solution Approach 2:
The patent dynamically changes the interpretation of the PUCCH resource indicator field based on whether the random access procedure is in the initial access phase or the data transmission phase. By parameter-changing the field's function according to procedure state, the system achieves flexible resource allocation for message repetitions without requiring additional complex signaling structures
2Productivity
If UCI is multiplexed with uplink message on PUSCH, then control information transmission efficiency is improved, but interference with data transmission may increase
Solution Approach 1:
The patent combines UCI and uplink data messages into a single PUSCH transmission during the data transmission phase of random access procedure. This merging approach improves control information transmission efficiency by utilizing existing data resources, while the separate phase structure ensures that UCI multiplexing only occurs when appropriate, minimizing potential interference
Solution Approach 2:
The patent dynamically adjusts the transmission mode: during initial access, separate PUCCH and PUSCH transmissions are used; during data transmission phase, UCI is multiplexed with data on PUSCH. This dynamic adaptation optimizes control information efficiency while managing interference through context-appropriate transmission strategies
3Reliability
If separate PUCCH resources are allocated for UCI transmission, then control information reliability is improved, but resource overhead increases
Solution Approach 1:
The patent makes the PUCCH resource indicator field serve multiple purposes: indicating PUCCH resources for UCI during initial access, and indicating PUSCH resources for message repetitions during data transmission. This eliminates the need for separate dedicated resources for different functions, reducing resource overhead while maintaining reliability through appropriate resource allocation in each phase
Solution Approach 2:
The patent changes the functional parameter of the PUCCH resource indicator field based on procedure phase. During data transmission, the field points to PUSCH resources for reliable message repetition; during initial access, it points to PUCCH resources for reliable UCI transmission. This parameter change optimizes resource usage and reduces overall overhead
Data Source
AI summary
Aspects of the disclosure relate to random access procedures. In one example, a user equipment (UE) can multiplex an uplink (UL) message with uplink control information (UCI) on a data region of a first slot and transmit the multiplexed UL message with the UCI to a base station in UL transmission or UL retransmission as part of the random access procedure. The UE may further employ UL message repetition to be transmitted with the multiplexed UL message with the UCI. The base station may receive the multiplexed UL message with the UCI with or without UL message repetition. Other aspects, embodiments, and features are also claimed and described.