22 RESET 复位类型： 0：S1 interface, 1：Part of S1 interface 27 32 OVERLOAD START SMS Traffic Load Reduction Indication,参见3GPP 36.413 9.2.3.36 短信传输方向： 0：下行方向 1：上行方向 其他编码 —— 该字段为全F； Table 9.9.3.11.1: EPS attach type information element
EPS attach type value (octet 1) Bits 3 2 1 0 0 1 0 1 0 1 1 0 1 1 1 All other values are unused and shall be interpreted as \network.【interpret解读、解释】 Bit 4 of octet 1 is spare and shall be coded as zero. EPS attach combined EPS/IMSI attach EPS emergency attach Reserved 流程1、ATTACH内容：3GPP TS 24.301第9.9.3.11节内容【mengtt】： 流程2、Extended Service Request内容：3GPP 24.301第9.9.3.27节【mengtt】 Table 9.9.3.27.1: Service type information element
Service type value (octet 1) Service type value Bits 4 3 2 1 0 0 0 0 mobile originating CS fallback or 1xCS fallback 0 0 0 1 mobile terminating CS fallback or 1xCS fallback 0 0 1 0 mobile originating CS fallback emergency call or 1xCS fallback emergency call All other values are reserved. 流程5、TAU内容：3GPP TS24.301第9.9.3.14节【mengtt】：
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Table 9.9.3.14.1: EPS update type information element
EPS update type value (octet 1, bit 1 to 3) Bits 3 2 1 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 All other values are reserved. \Bit 4 0 1 No bearer establishment requested Bearer establishment requested TA updating combined TA/LA updating combined TA/LA updating with IMSI attach periodic updating unused; shall be interpreted as \ unused; shall be interpreted as \流程6、Type of detach及Switch off的取值参见3GPP 24.301第9.9.3.7节【mengtt】 Figure 9.9.3.7.1: Detach type information element
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Table 9.9.3.7.1: Detach type information element
Type of detach (octet 1) In the UE to network direction: Bits 3 2 1 0 0 1 0 1 0 0 1 1 1 1 0 1 1 1 All other values are interpreted as \protocol. In the network to UE direction: Bits 3 2 1 0 0 1 0 1 0 0 1 1 1 1 0 1 1 1 All other values are interpreted as \ Switch off (octet 1) In the UE to network direction: Bit 4 0 1 In the network to UE direction bit 4 is spare. The network shall set this bit to zero. normal detach switch off re-attach required re-attach not required IMSI detach Reserved Reserved EPS detach IMSI detach combined EPS/IMSI detach Reserved Reserved 流程7、PDN connectivity内容，详见3GPP TS 24.008第10.5.6.17节【mengtt】：
8
7
6
5
4 0 Spare
3
2
1
octet 1 Request type IEI Request type value Figure 10.5.158/3GPP TS 24.008: Request type information element
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Table 10.5.173/3GPP TS 24.008: Requesttype information element
Requesttype value (octet 1) Bits 3 2 1 0 0 1 0 1 0 0 1 1 All other values are reserved.【预留的】 Bit 4 of octet 1 is spare and shall be coded as zero. initial request Handover Unused. If received, the network shall interpret this as \
10.4. S1-MME接口Keyword 2字段定义
S1-MME接口Keyword 2字段取值定义如下，后续将根据上层需要扩展该字段的取值。 S1AP-NAS流程编码 1 Attach 8070605040321流程类型 Keyword 1字段取值 EPS attach result value EPS attach result value的取值参见3GPP 24.301第9.9.3.10节 5 TAU 8070605040321EPS update result value EPS updateresult value的取值参见3GPP 24.301第9.9.3.13节 6 Detach 触发方式： 0：流程由UE发起 1：流程由网络侧发起 其他编码 —— 该字段为全F； 流程1：Attach result value【mengtt】 The purpose of the EPS attach result information element is to specify the result of an attach procedure.
The EPS attach result information element is coded as shown in figure 9.9.3.10.1 and table 9.9.3.10.1.
The EPS attach result is a type 1 information element.
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8
7
6
5
4 0 Spare
3
2
1
EPS attach result IEI EPS attach result value octet 1 Figure 9.9.3.10.1: EPS attach result information element Table 9.9.3.10.1: EPS attach result information element
EPS attach result value (octet 1) Bits 3 2 1 0 0 1 0 1 0 All other values are reserved. Bit 4 of octet 1 is spare and shall be coded as zero. EPS only combined EPS/IMSI attach
流程5：EPS updateresult value【mengtt】
The purpose of the EPS update result information element is to specify the result of the associated updating procedure.
The EPS update result information element is coded as shown in figure 9.9.3.13.1 and table 9.9.3.13.1.
The EPS update result is a type 1 information element.
8
7
IEI
6
5
4 0 Spare 3
2 value 1
octet 1 EPS update result EPS update result Figure 9.9.3.13.1: EPS update result information element
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