3GPP TS 36.331 ASN.1消息中Optional的含义

Table 6.1-1: Meaning of abbreviations used tospecify the need for fields to be present

Abbreviation

Meaning

Cond conditionTag[u1] 

(Used in downlink only)

Conditionally present

A field for which the need is specified by means of conditions. For each conditionTag, the need is specified in a tabular form following the ASN.1 segment. In case, according to the conditions, a field is not present, the UE takes no action and where applicable shall continue to use the existing value (and/ or the associated functionality) unless explicitly stated otherwise (e.g. in the conditional presence table or in the description of the field itself).

Need OP[u2] 

(Used in downlink only)

Optionally present

A field that is optional to signal. For downlink messages, the UE is not required to take any special action on absence of the field beyond what is specified in the procedural text or the field description table following the ASN.1 segment. The UE behaviour on absence should be captured either in the procedural text or in the field description.

Need ON[u3] 

(Used in downlink only)

Optionally present, No action

A field that is optional to signal. If the message is received by the UE, and in case the field is absent, the UE takes no action and where applicable shall continue to use the existing value (and/ or the associated functionality).

Need OR[u4] 

(Used in downlink only)

Optionally present, Release

A field that is optional to signal. If the message is received by the UE, and in case the field is absent, the UE shall discontinue/ stop using/ delete any existing value (and/ or the associated functionality).

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 [u1]基于某种条件，如果不出现，UE不做相关的操作、或按已有的配置继续使用，除非特别说明。

 [u2]如果不出现，就按照流程的描述或字段描述表格处理。

 [u3]如果不出现，UE不做处理并且继续使用已有的值。

 [u4]如果不出现，UE中止/停止使用/删除原有的值或相关的功能。