性能
- UE触发beam reporting
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channel state information (CSI) reporting的端口数从32增加到128
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non-ideal synchronization 和 backhaul 场景下的 inter-site CJT
non-ideal synchronization指的是接收和发送使用不同的基站,backhaul指的是无线回程 -
SBFD
带内全双工,在TDD中引入SBFD可以降低延迟,改善覆盖范围,增加容量。
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intra-CU layer 1(L1)/layer 2 (L2)-triggered mobility (LTM)
LTM可以减少漫游的延迟和中断时间,但是在R18中公支持CU内的LTM,R19中引入了跨CU的LTM
拓朴
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5G femtocell
一个Wifi路由器大小的设备,插到光猫上,可以中继5G信号
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multi-hop sidelink relay
R18仅支持single-hop UE-to-network sidelink relay,single-hop UE-to-network sidelink relay,但是R19可以多个UE串起来中继来扩展传输距离
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additional reference satellite payload parameters
降低卫星的EIRP密度
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store-and-forward satellite operation with regenerative payload for IoT NTN
为IoT NTN提供卫星转发能力,这样不需要地面站也能工作
节能
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LP-WUR
低功耗唤醒无线电,在以前使用的是DRX机制定期唤醒radio,LP-WUR则使用一个低功耗无线电来接收LP-WUS信号来唤醒主radio。RRM测量也从主radio卸载到LP-WUR.当UE处于连接模式时LP-WUR也可以触发主radio去监听physical downlink control channel (PDCCH)
LP-WUR主要用于物联网设备 -
On-demand SSB transmission for devices in CONNECTED MODE with intra-/inter-band CA
Specify triggering based on device uplink wake-up signal (WUS), cell on/off indication via backhaul, Scell activation/deactivation signaling
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On-demand SIB1 transmission for devices in IDLE / INACTIVE mode
Study triggering based on uplink WUS
Study WUS configuration provisioning to device
Study information exchange between gNodeBs for the configuration of WUS -
adaptation of common signal/channel transmissions
Specify adaptation of PRACH and SSB in time domain (e.g., periodicity)
Study adaptation of PRACH in spatial domain (e.g., non-uniform resources)
Specify adaptation of paging occasions
以上3个特定主要用于节省基站的能耗,基本思路是使用按需的广播信号而不是周期发送,是对R18中Study on network energy savings for NR工作的延续。
6G
6G用例和需求,R20进行6G技术研究
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