The maximum number of PDU sessions which a UE can establish in a PLMN is limited by whichever is the lowest of: the maximum number of PDU session IDs allowed by the protocol (as specified in 3GPP TS 24.007 [11] subclause 11.2.3.1b), the PLMN's maximum number of PDU sessions and the UE's implementation-specific maximum number of PDU sessions.
UE可以在PLMN中建立的PDU会话的最大数量受到以下两者中最低者的限制：协议允许的最大PDU会话ID数量（如3GPP TS 24.007[11]的11.2.3.1b节中规定）、PLMN的最大PDU会话数量和UE的实现特定的最大PDU会话数量。
If during a UE-requested PDU session establishment procedure the 5GSM sublayer in the UE receives an indication that the 5GSM message was not forwarded because the PLMN's maximum number of PDU sessions has been reached, then the UE determines the PLMN's maximum number of PDU sessions as the number of active PDU sessions it has.
如果在UE请求的PDU会话建立过程期间，UE中的5GSM子层接收到由于已达到PLMN的最大PDU会话数而未转发5GSM消息的指示，则UE将PLMN最大PDU对话数确定为其具有的活动PDU会话数目。
NOTE 1: In some situations, when attempting to establish multiple PDU sessions, the number of active PDU sessions that the UE has when 5GMM cause #65 is received is not equal to the maximum number of PDU sessions reached in the network.
注1：在某些情况下，当尝试建立多个PDU会话时，当接收到5GMM cause#65时，UE具有的活动PDU会话的数量不等于网络中达到的最大PDU会话数量。
NOTE 2: When the network supports emergency services, it is not expected that 5GMM cause #65 is returned by the network when the UE requests an emergency PDU session.
注2：当网络支持紧急服务时，当UE请求紧急PDU会话时，预计网络不会返回5GMM原因#65。
NOTE 3: There is only one maximum number of PDU sessions for a PLMN regardless of which access the PDU session exists in.
注3：对于PLMN，PDU会话的最大数量只有一个，而不管PDU会话存在于哪个访问中。
NOTE 4: An MA PDU session which (only) has a PDN connection established as a user-plane resource is counted as an active PDU session when determining the PLMN's maximum number of PDU sessions.
注4：当确定PLMN的最大PDU会话数时，（仅）具有作为用户面资源建立的PDN连接的MA PDU会话被视为活动PDU会话。
The PLMN's maximum number of PDU sessions applies to the PLMN in which the 5GMM cause #65 "maximum number of PDU sessions reached" is received. When the UE is switched off, when the USIM is removed, or the entry in the "list of subscriber data" for the current SNPN is updated, the UE shall clear all previous determinations representing PLMN's maximum number of PDU sessions. Upon successful registration with a new PLMN, the UE may clear previous determinations representing any PLMN's maximum number(s) of PDU sessions.
PLMN的最大PDU会话数适用于接收到5GMM原因#65“达到的PDU会话最大数”的PLMN。当UE关闭、USIM移除或当前SNPN的“订户数据列表”中的条目更新时，UE应清除表示PLMN最大PDU会话数的所有先前确定。在向新PLMN成功注册后，UE可以清除表示任何PLMN的PDU会话的最大数目的先前确定。
If the maximum number of established PDU sessions is reached at the UE and the upper layers of the UE request connectivity to a DNN the UE shall not send a PDU SESSION ESTABLISHMENT REQUEST message unless an established PDU session is released. If the UE needs to release an established PDU session, choosing which PDU session to release is implementation specific, however the UE shall not release the emergency PDU session.
如果UE处已建立PDU会话的最大数量达到，并且UE的上层请求连接到DNN，则UE不应发送PDU会话建立请求消息，除非已建立的PDU会话被释放。如果UE需要释放已建立的PDU会话，则选择释放哪个PDU会话是特定于实现的，但是UE不应释放紧急PDU会话。
If the UE needs to release a PDU session in order to request an emergency PDU session, it shall either perform a local release of a PDU session or release a PDU session via explicit signalling. If the UE performs a local release, the UE shall:
如果UE需要释放PDU会话以请求紧急PDU会话，则其应执行PDU会话的本地释放或通过显式信令释放PDU对话。如果UE执行本地释放，则UE应：
a) if the PDU session is an MA PDU session:
a） 如果PDU会话是MA PDU会话：
1) perform a registration procedure for mobility and periodic registration update to indicate PDU session status to the network over each access that user plane resources have been established; and
1） 执行用于移动性和周期性注册更新的注册过程，以在已经建立用户面资源的每个接入上向网络指示PDU会话状态；和
2) perform a normal and periodic tracking area updating to indicate EPS bearer context status to the network as specified in clause 5.5.3.2.2 of 3GPP TS 24.301 [15] when a PDN connection has been established as a user plance resource; or
2） 如3GPP TS 24.301[15]第5.5.3.2.2节所述，执行正常和定期的跟踪区域更新，以向网络指示EPS承载上下文状态；或
b) if the PDU session is a single access PDU session, perform a registration procedure for mobility and periodic registration update to indicate PDU session status to the network over the access the PDU session is associated with.
b） 如果PDU会话是单接入PDU会话，则执行移动性和定期注册更新的注册过程，以通过与PDU会话相关联的接入向网络指示PDU会话状态。