PUSCH Repetition Counting in Half-Duplex Paired Spectrum
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving reliable and efficient uplink resource allocation, particularly in half-duplex operations, where simultaneous transmission and reception on paired frequency carriers can lead to interference and reduced coverage.
Innovation Solution
The implementation of PUSCH repetition mechanisms, where user equipment (UE) receives an indication of a repetition count from a scheduling entity and transmits repetitions of uplink transmissions on a subset of slots on a paired carrier, allowing for coordinated resource allocation and interference mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUSCH repetition is implemented to improve uplink reliability and coverage, then the uplink transmission reliability is improved, but the resource allocation complexity increases
Solution Approach 1:
The uplink transmission is divided into multiple repetitions across different slots, where each repetition is a separate transmission instance. The resource allocation is segmented by providing separate indications for each repetition's time resources, allowing the system to achieve diversity gain while managing complexity through structured segmentation of the transmission process.
Solution Approach 2:
The scheduling entity provides resource allocation indications for multiple repetitions in advance, before the actual transmissions occur. This preliminary allocation includes indicating the time resources for each repetition, allowing the UE to prepare and execute repetitions without real-time decision complexity, thus improving reliability while controlling resource allocation complexity.
2Length of stationary object
If resource allocation is provided for multiple slots to enable PUSCH repetition, then the coverage is improved, but the signaling overhead increases
Solution Approach 1:
Resource allocation indications for multiple repetitions are merged into a single scheduling decision. The scheduling entity provides a unified resource allocation that covers multiple slots, where the time resources for different repetitions are indicated together rather than through separate signaling messages, reducing overall signaling overhead while maintaining extended coverage capability.
Solution Approach 2:
The resource allocation mechanism is designed to be universal, serving multiple functions simultaneously: it allocates resources for initial transmission, indicates time resources for repetitions, and manages half-duplex operations across paired carriers. This multi-functional approach reduces the need for separate signaling for each function, thereby reducing overhead while supporting coverage extension.
3Object-affected harmful factors
If half-duplex operation is used on paired carriers to avoid interference, then the interference is reduced, but the transmission efficiency decreases
Solution Approach 1:
The system employs periodic time division between uplink and downlink transmissions on paired carriers, with half-duplex slots alternating in a regular pattern. This periodic action ensures that when one carrier is transmitting uplink, the other is receiving downlink, and vice versa, systematically avoiding self-interference while maintaining efficient utilization of both carriers through structured time-multiplexing.
Solution Approach 2:
The resource allocation is made dynamic by providing flexible time resource indications for each repetition, allowing the system to adapt to varying traffic conditions and channel states. The scheduling entity can dynamically adjust which slots are allocated for uplink repetitions versus downlink receptions on paired carriers, optimizing the balance between interference avoidance and transmission efficiency based on real-time conditions.
Data Source
AI summary
Techniques related to uplink transmission repetitions are disclosed. Some aspects of the disclosure relate to devices and methods for wireless communications that include transmitting or receiving repetitions of uplink transmissions. In one example, a user equipment (UE) and a scheduling entity can receive/transmit an indication of a repetition count from a scheduling entity; receive/transmit a resource allocation for a set of a plurality of slots on a first carrier; and transmit/receive repetitions of an uplink transmission on a subset of the plurality of slots on the first carrier. Here, the first carrier is paired with a second carrier and separated from the second carrier in frequency. Also, the UE operates in a half duplex communication, and a quantity of the repetitions transmitted is based on the repetition count. Other aspects, embodiments, and features are also claimed and described.