Section: 7.2.24 Modify Access Bearers Request
Content: The direction of this message shall be from MME to SGW (see Table 6.1-1). If both the SGW and the MME support the MABR feature (see clause 8.83), an MME may send a Modify Access Bearer Request message on the S11 interface to an SGW as part of the following procedures: - UE triggered Service Request if there is no suspended bearer for that UE, - S1-based Handover without SGW relocation, - X2-based handover without SGW relocation, - Inter-MME E-UTRAN Tracking Area Update without SGW Change, - Intra-MME E-UTRAN Tracking Area Update without SGW Change with Active Flag; - E-UTRAN Initiated E-RAB modification procedure - Mobile Originated Data transport in Control Plane CIoT EPS optimisation with P-GW connectivity - Mobile Terminated Data Transport in Control Plane CIoT EPS optimisation with P-GW connectivity - Connection Resume procedure (see clause 5.3.5A of 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [3]) - Establishment of S1-U bearer during Data Transport in Control Plane CIoT EPS optimisation procedure (see clause 5.3.4B.4 of 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [3]). if all the following conditions are fulfilled: - the RAT type has not changed; - the Serving Network has not changed; - the MME does not need to report a H(e)NB local IP address and UDP port number information change; - the MME does not need to send UE's location and/or User CSG information or/and UE Time Zone and/or Presence Reporting Area information to the PDN GW; - the MME does not need to send an MME-FQ-CSID as per the requirements specified in 3GPP TS 23.007[ Restoration procedures ]  [17]; - ISR is not activated, if the Modify Access Bearers Request is sent as part of a UE triggered Service Request; - ISR was not activated in the old MME which is indicated by the ISRAU flag in the Context Response, if the Modify Access Bearers Request is sent as part of an Inter-MME E-UTRAN Tracking Area Update without SGW change. - the support of ePCO has not be changed during inter MME mobility. - Secondary RAT Usage Data Report(s) is not required to be forwarded to the PGW(s) for any active PDN Connections. The Modify Access Bearers Request message shall include all the bearer contexts of all the PDN connections of the UE. Support of this message is optional for the MME and SGW. Table 7.2.24-1: Information Elements in a Modify Access Bearers Request Table 7.2.24-2: Bearer Context to be modified within Modify Access Bearers Request Table 7.2.24-3: Bearer Context to be removed within Modify Access Bearers Request