5G(NR)网络无线资源控制(RRC)中引入了下列计时器、计数器和常量,以便 UE 在 RRC
setuprequest, RRC reestablishment, RRC resume, RRC suspend 等进程的可靠运行。
RRC 计时器,指示计时器持续时间及在事件中何时开始和停止;如果计时器超时,
UE 将采取的行动。这些计时器由字母“T”表示,后跟 3 位数字,例如 T300。每个计时器
起始值为零;UE 应用的计时器值倒计数为零时,则计为超时;除非明确说明另有规定。
� Timer: T300
▪ Start Point:(起始点)
▪ Upon transmission of RRCSetupRequest
▪ Stop Point:(结束点)
▪ Upon reception of RRCSetup or RRCReject message
▪ Upon Cell re-selection
▪ Upon abortion of connection establishment by upper
layers
▪ Action upon Timer Expiry:(超时后续动作)
� Timer: T301
▪ Start Point:(起始点)
▪ Upon transmission of RRCReestabilshmentRequest
▪ Stop Point:(结束点)
▪ Upon reception
of RRCReestablishment or RRCSetupmessage
▪ when the selected cell becomes unsuitable
▪ Action upon Timer Expiry:(超时后续动作)
▪ Go to RRC-IDLE
� Timer: T302
▪ Start Point:(起始点)
▪ Upon reception of RRCReject while performing RRC
connection establishment or resume,
▪ Upon reception of RRCRelease with waitTime
▪ Stop Point:(结束点)
▪ Upon entering RRC-CONNECTED or RRC-IDLE
▪ Upon cell re-selection
▪ Upon reception of RRCReject message
▪ Action upon Timer Expiry:(超时后续动作)
▪ Inform upper layers about barring alleviation
� Timer: T304
▪ Start Point:(起始点)
▪ Upon detecting physical layer problems
for the SpCell i.e. upon receiving N310 consecutive out-
of sync indications from lower layers
▪ Stop Point:(结束点)
▪ Upon receiving N311 consecutive in-
sync indications from lower layers for the SpCell,