Section: 5.4.8 Access Stratum Release Assistance Indication
Content: Access Stratum Release Assistance Indication is used to provide the serving eNB with information whether subsequent DL or UL transmission is expected. AS RAI uses the DCQR and AS RAI MAC Control Element. Upper layers trigger AS RAI. For EDT and transmission using PUR, if AS RAI is triggered by upper layers but is not included in the resulting MAC PDU with the MAC SDU as a result of logical channel prioritization, AS RAI is cancelled, for other transmissions if AS RAI is not included in the resulting MAC PDU as a result of logical channel prioritization, AS RAI may be cancelled. If rai-Activation is configured and a buffer size of zero bytes has been triggered for the BSR and no subsequent DL and UL data transmission is expected, and if rai-ActivationEnh is enabled and applicable as specified in TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [8], it is up to UE to send BSR MAC control element or DCQR and AS RAI MAC control element.