Section: 4.7.2.1.1 READY timer behaviour (A/Gb mode only)
Content: The READY timer, T3314 is used in the MS and in the network per each assigned P-TMSI to control the cell updating procedure. When the READY timer is running or has been deactivated the MS shall perform cell update each time a new cell is selected (see 3GPP TS 43.022[ None ]  [82]). If a routing area border is crossed, a routing area updating procedure shall be performed instead of a cell update. When the READY timer has expired: - the MS shall perform the routing area updating procedure when a routing area border is crossed; - the MS shall not perform a cell update when a new cell is selected. - the network shall page the MS if down-link user data or signalling information needs to be sent to the MS. All other GMM procedures are not affected by the READY timer. The READY timer is started: - in the MS when the GMM entity receives an indication from lower layers that an LLC frame other than LLC NULL frame has been transmitted on the radio interface; and - in the network when the GMM entity receives an indication from lower layers that an LLC frame other than LLC NULL frame has been successfully received by the network. Within GMM signalling procedures the network includes a "force to standby" information element, in order to indicate whether or not the READY timer shall be stopped when returning to the GMM-REGISTERED state. If the "force to standby" information element is received within more than one message during a ongoing GMM specific procedure, the last one received shall apply. If the READY timer is deactivated and the network indicates "force to standby" with the "force to standby" information element, this shall not cause a modification of the READY timer. The READY timer is not affected by state transitions to and from the GMM-REGISTERED.SUSPENDED sub-state. The value of the READY timer may be negotiated between the MS and the network using the GPRS attach or GPRS routing area updating procedure. - If the MS wishes to indicate its preference for a READY timer value it shall include the preferred values into the ATTACH REQUEST and/or ROUTING AREA UPDATE REQUEST messages. The preferred values may be smaller, equal to or greater than the default values or may be equal to the value requesting the READY Timer function to be deactivated. - Regardless of whether or not a timer value has been received by the network in the ATTACH REQUEST or ROUTING AREA UPDATE REQUEST messages, the network may include a timer value for the READY timer (different or not from the default value) into the ATTACH ACCEPT or ROUTING AREA UPDATE ACCEPT messages, respectively. If the READY Timer value was included, it shall be applied for the GMM context by the network and by the MS. - When the MS proposes a READY Timer value and the Network does not include any READY Timer Value in its answer, then the value proposed by the MS shall be applied for the GMM context by the Network and by the MS. - When neither the MS nor the Network proposes a READY Timer value into the ATTACH REQUEST/ATTACH ACCEPT or ROUTING AREA UPDATE REQUEST/ROUTING AREA UPDATE ACCEPT message, then the default value shall be used. If the negotiated READY timer value indicates that the ready timer function is deactivated, the READY timer shall always run without expiry. If the negotiated READY timer value indicates that the ready timer function is deactivated, and within the same procedure the network indicates "force to standby" with the "force to standby" information element, the READY timer shall always run without expiry. If the negotiated READY timer value is set to zero, the READY timer shall be stopped immediately. To account for the LLC frame uplink transmission delay, the READY timer value should be slightly shorter in the network than in the MS. This is a network implementation issue. If a new READY timer value is negotiated, the MS shall upon the reception of the ATTACH ACCEPT or ROUTING AREA UPDATE ACCEPT message perform an initial cell update (either by transmitting a LLC frame or, if required, a ATTACH COMPLETE or ROUTING AREA UPDATE COMPLETE message), in order to apply the new READY timer value immediately. If both the network and the MS support the Cell Notification, the initial cell update shall use any LLC frame except the LLC NULL frame. If the new READY timer value is set to zero or if the network indicates "force to standby" with the "force to standby" IE, the initial cell update should not be done.