PUSCH Power Control for RedCap Coverage in 5G NR
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Solution Overview
Problem
The 5G NR system faces challenges in maintaining adequate quality of service, particularly for RedCap UEs with reduced capabilities, due to higher path-loss at higher frequencies, leading to coverage issues for IoT use cases that require lower reliability and longer latency compared to URLLC, and lower data rates compared to eMBB.
Innovation Solution
A method for transmitting Physical Uplink Shared Channel (PUSCH) that involves configuring a first PUSCH with a number of repetitions and applying Transmit Power Control (TPC) commands based on the reception of Physical Downlink Control Channel (PDCCH) within a specific symbol timeframe, ensuring proper power control for PUSCH transmission occasions within slot bundles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If PUSCH transmission is performed at higher frequencies (28 GHz or 39 GHz) to enable 5G NR operation, then data rate and network capacity are improved, but path-loss increases making coverage more challenging
Solution Approach 1:
The patent applies preliminary action by determining the TPC command application timing in advance based on the slot bundle structure. The UE identifies whether to apply the TPC command to the first or second PUSCH transmission occasion before actual transmission, ensuring optimal power control is prepared ahead of time to compensate for high path-loss at FR2 frequencies.
Solution Approach 2:
The patent implements dynamics by making the TPC command application flexible and adaptive. The timing of TPC command application is dynamically determined based on whether the PDCCH is received within a specific number of symbols before the slot bundle, allowing the system to adapt power control timing to varying channel conditions and scheduling scenarios.
2Device complexity
If RedCap UEs use reduced capabilities (fewer RX antennas or smaller antenna size) to reduce complexity, then device cost and complexity are reduced, but coverage performance deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the power control parameters specifically for RedCap UEs. The TPC command timing adjustment changes the transmission power parameters, compensating for the reduced antenna capabilities of RedCap UEs and restoring adequate coverage performance without increasing device complexity.
3Reliability
If TPC command is applied to the first PUSCH transmission occasion within a slot bundle, then power control responsiveness is improved, but timing synchronization becomes more challenging at higher frequencies
Solution Approach 1:
The patent applies segmentation by dividing the slot into structured bundles with specific timing relationships. The slot bundle structure segments the transmission occasions into identifiable units, making it easier to manage TPC command application timing and maintain synchronization at high frequencies by working with discrete, well-defined time units rather than continuous timing.
Data Source
AI summary
A method for transmitting physical uplink shared channel (PUSCH) and a user equipment (UE) are provided. In the method, a configuration of a first PUSCH with a number of PUSCH repetitions is received. Physical Downlink Control Channel (PDCCH) which includes a Transmit Power Control (TPC) command is received. Whether the PDCCH is received within a number of symbols before a first symbol of a slot bundle is determined. In response to determining the PDCCH is received within the number of symbols before the first symbol of the slot bundle, the TPC command is applied for a first PUSCH transmission occasion within the slot bundle. In response to determining the PDCCH is not received within the number of symbols before the first symbol of the slot bundle, the TPC command is applied for a second PUSCH transmission occasion within a second slot bundle after the slot bundle.