R1-2508739
discussion
Views on energy saving for 6GR
From Huawei
Summary
This Huawei contribution on 6GR energy saving provides extensive technical proposals across evaluation methodology, network energy saving technologies, and device energy saving technologies, totaling approximately 40 proposals and 60 observations. The document covers BS/UE power consumption models, power scaling methods, common signal period extension, BS low power mode, cell DTX/DRX enhancements, spatial domain NES, and various UE energy saving mechanisms.
Position
Huawei proposes introducing BS low power mode (LPR) with ultra-narrow bandwidth (e.g., 5MHz/10MHz) to transmit on-demand synch. signals and DL/UL WUS signals while keeping BS main radio (MR) in sleep state, achieving trade-off between network energy saving and UE performance. They propose scaling both dynamic and static power consumption for BS low power mode, with static power scaled linearly with active TRX fraction and RF bandwidth ratio, while reusing 5G scaling method for dynamic power. They observe that the on-demand synch. signal between clustered common signals is necessary to compensate synchronization and measurement accuracy loss for connected UEs, and propose that it can be simplified by excluding PBCH. They propose UE power consumption be split into static and dynamic components, with static power equal to micro-sleep power, and provide updated reference power models for main radio and LP radio. They propose studying cell DTX/DRX parameter adaptation according to dynamic traffic pattern and CSI acquisition during inactive time using AI/sensing prior information. They propose DFT-s-OFDM based DL WUS for coverage enhancement, enhanced BWP mechanism with coarse granularity and longer switching delay to reduce static power, and preamble sequence with larger pool size for fast system re-entry.
Key proposals
- Proposal 1 (Sec 2.1.1): New sleep state of 'Quasi-off' to represent BS/TRP's almost 'OFF' state, which consumes less power than deep sleep, which is 0.2 with 1 assumed for deep sleep.
- Proposal 1 (Sec 2.1.2): For BS's traditional mode, the same power consumption scaling method as 5G can be re-used for 6GR NES performance evaluation.
- Proposal 1 (Sec 2.1.3): For some FTP3 traffic with delay requirement, the network energy consumption should be evaluated and compared with a given QoS satisfaction rate.
- Proposal 1 (Sec 2.2.1): Besides evaluating overall power consumption considering the traffic model and QoS requirement, when evaluate the UE energy-efficiency, the following three cases focusing on specific aspects of power consumption are also to be investigated at least for calibration purpose: only PDCCH monitoring case, PDSCH/PUSCH case, only in IDLE state.
- Proposal 1 (Sec 2.2.2): In 6GR study, UE power consumption should be split into dynamic power consumption and static power consumption, where the value of static power consumption is the same as that of micro-sleep for the same BW and Rx/Tx number.
- Proposal 1 (Sec 2.2.3): In 6GR study, UE power consumption model of LPR in Table 2 can be used.
- Proposal 1 (Sec 2.2.4): In 6GR UE power model study, the template in Table 3 is used for further collection on scaling factors.
- Proposal 1 (Sec 3.1.1): The study of SSB period extension and clustered common signal design should take the same coverage requirement between co-sited 7GHz and 5G mid-band into consideration.
- Proposal 1 (Sec 3.2.1): 6GR should study BS low power mode, in order to achieve trade-off between network energy saving and UE's performance, at least includes functionalities and signals of BS's low power mode, signal design including waveform and sequence, the related procedures, impact on UE including coverage, complexity, and power consumption.
- Proposal 1 (Sec 3.3.1): Study cell DTX/DRX parameter adaption according to dynamic traffic pattern.
- Proposal 1 (Sec 3.4.1): Support antenna adaptation for UE specific signals and study its extension to common signals during initial access, as well as the potential impact on coverage.
- Proposal 1 (Sec 3.4.2): 6GR should study a simplified TRP ON/OFF updating framework in multi-TRP scenario, to reduce signalling overhead and complexity.
- Proposal 1 (Sec 3.4.3): Study inter-TRP interference measurement mechanism when the DTX/DRX patterns among TRPs are different.
- Proposal 1 (Sec 4.2.1): DFT-s-OFDM can be considered for DL WUS design to enhance coverage performance.
- Proposal 1 (Sec 4.2.2): Study at least the following aspect for new PDCCH mechanism and design, taking into account low detection complexity, low power consumption and impact on system performance: avoid unnecessary extension of drx-InactivityTimer caused by pre-scheduling.