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為降低切換失敗率、增強(qiáng)可靠性， 3GPP 在 R16 階段引入了移動(dòng)性增強(qiáng)，主要功能包含條件切換（ Conditional Handover， CHO）以及雙協(xié)議棧切換（ Dual Active Protocol Handover， DAPS HO）。

條件切換。條件切換指的是當(dāng)切換條件滿足時(shí)由終端執(zhí)行切換?；靖鶕?jù) UE 所處位置的覆蓋情況，預(yù)先配置若干小區(qū)作為 UE 切換的目標(biāo)小區(qū)；UE 執(zhí)行測(cè)量， 檢測(cè)到切換觸發(fā)條件滿足時(shí)直接向目標(biāo)小區(qū)發(fā)起接入，完成條件切換。條件切換能夠避免在終端和源基站進(jìn)行信令交互、以及源基站和目標(biāo)基站進(jìn)行信令交互的時(shí)間內(nèi)，由于無線鏈路狀態(tài)變化導(dǎo)致的 UE 切換失敗的情況發(fā)生，提高切換成功率。

該功能適用于高速場(chǎng)景，節(jié)省傳統(tǒng)切換“事件觸發(fā)-MR 上報(bào)-切換命令”的時(shí)間，屬于 R16 版本芯片高優(yōu)先級(jí)引入的新需求。

雙協(xié)議棧切換。雙協(xié)議棧切換允許移動(dòng)終端在切換時(shí)始終保持與源小區(qū)連接，直到與目標(biāo)小區(qū)開始進(jìn)行收發(fā)數(shù)據(jù)為止。即在切換過程這段極短的時(shí)間里，移動(dòng)終端同時(shí)從源小區(qū)和目標(biāo)小區(qū)接收和發(fā)送數(shù)據(jù)， 通過這種方式， DAPS 切換下理論上用戶面中斷時(shí)延為 0ms。但終端支持雙協(xié)議棧需要硬件升級(jí)以支持兩路收發(fā)，包括兩套 L1、 L2、射頻鏈路，復(fù)雜度和成本較高。

CA/DC/SUL。載波聚合特性（ CA） 最早在 LTE-A 標(biāo)準(zhǔn)中引入， 5G 標(biāo)準(zhǔn)沿用了該特性以滿足 5G 移動(dòng)數(shù)據(jù)流量增長(zhǎng)對(duì)高傳輸速率的需求。3GPP R15 標(biāo)準(zhǔn)定義 NR CA 的基本功能及協(xié)議流程，并引入了下行載波聚合的載波間 SRS 輪發(fā)等功能；

R16標(biāo)準(zhǔn)在此基礎(chǔ)上進(jìn)一步增強(qiáng)，一方面是提升載波聚合的性能，如進(jìn)一步提高上/下行數(shù)據(jù)傳輸速率、縮短載波聚合的建立時(shí)延，另一方面則是增強(qiáng)載波聚合的網(wǎng)絡(luò)部署靈活性以適應(yīng)多種多樣的頻段組合和部署場(chǎng)景的需求。

CA 及 SUL 頻段組合。載波聚合方面，目前部署場(chǎng)景主要面向上/下行 2CC 的頻段組合，其中，下行 CA 要求必選支持 n41（100M+60M）帶內(nèi)連續(xù) CA、 n41（100M）+n28（30M）和n41（100M）+n79（100M）帶間 CA；上行 CA 要求必選支持 n41（100M+60M）帶內(nèi)連續(xù) CA 且每載波兩流，推薦支持 n41（100M）+n28（30M）和 n41（100M）+n79（100M）帶間 CA。推薦芯片可支持 n41（ 100M+100M， 40MHz 資源重疊）帶內(nèi)連續(xù) CA。

SUL 作為增強(qiáng)需求， n41+n83（ SUL CC） 頻段組合具有較高優(yōu)先級(jí)，其他頻段組合例如 n41/n79 作為 NR CC 與 2.3GHz/ 1.8GHz/ 900MHz/ 2.0GHz/ 1.9GHz作為 SUL CC 的組合， 在未來也存在部署的可能。

下行載波聚合載波間 SRS 輪發(fā)。針對(duì)下行載波聚合（ DL CA）， 下行載波數(shù)大于上行載波數(shù)， TDD 頻段的下行輔載波 Scell 沒有對(duì)應(yīng)頻段的上行載波發(fā)送上行探測(cè)參考信號(hào)（ SRS， Sounding Reference Signal）， 導(dǎo)致無法利用 TDD 頻段的上/下行信道互異性進(jìn)行下行信道質(zhì)量的評(píng)估，從而影響下行信道的傳輸性能。

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