3GPP R19特性

性能

  • UE触发beam reporting

  • channel state information (CSI) reporting的端口数从32增加到128

  • 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。

  • 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

  • 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

  • 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

  • additional reference satellite payload parameters

    降低卫星的EIRP密度

  • 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

  • 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

  • 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

Views: 0