Support of mobile-terminated short message delivery for a user equipment using a power saving mechanism such as extended idle mode DRX
A mobile network entity configured to upon reception of a TFR message forwarding a SM towards a UE in extended idle mode DRX, including a SM-Delivery-Timer/Start-Time indicating the time used in the SM gateway SMSC to supervise the receipt of the TFR message, keep the SM for a specified time if the UE is expected to become reachable before the expiration of the timer, and page the UE. If the UE responds to this paging during this specified time, the mobile network entity configured to deliver the SM to the UE, and if the UE does not respond to this paging during this specified time, or if the UE is not expected to respond within this time, send towards a SM gateway SMSC a delivery failure and set a flag to record that the UE is currently not reachable.
1. An apparatus comprising circuitry configured to:
receive a mobile-terminating-forward-short-message-request message for forwarding a short message towards a user equipment,
determine if the received mobile-terminating-forward-short-message-request message includes a short message delivery timer/short message delivery start time, the short message delivery timer/short message delivery start time indicating a time used in a short message gateway to supervise a receipt of a mobile-terminating-forward-short-message-answer message,
determine if the user equipment using a power saving mechanism is waking up within a time frame indicated by the short message delivery timer/short message delivery start time, and
if the user equipment using the power saving mechanism is waking up within the time frame indicated by the short message delivery timer/short message delivery start time, deliver the short message to the user equipment without short message retransmission.
2. The apparatus-according to claim 1 , wherein:
the power saving mechanism includes extended idle mode discontinuous reception.
3. An apparatus comprising circuitry configured to:
determine that a user equipment using a power saving mechanism becomes reachable by receiving a paging response from the user equipment, and
if the user equipment using the power saving mechanism becomes reachable, send towards a home subscriber server a notify request message including a max-user-equipment-availability-time, the max-user-equipment-availability-time indicating a time window in which a signaling connection is maintained with the user equipment after a paging response from the user equipment.
4. The apparatus according to claim 3 , wherein:
the max-user-equipment-availability time is an indication for a service center that the service center is to prioritize retransmission of a short message sent to the user equipment using the power saving mechanism.
5. The apparatus according to claim 3 , wherein:
the power saving mechanism includes extended idle mode discontinuous reception.
6. An apparatus comprising circuitry configured to:
receive a mobile-terminating-forward-short-message-request message for forwarding a short message towards a user equipment,
determine if the received mobile-terminating-forward-short-message-request message includes a max retransmission time indicating for how long a short message gateway is ready to store the short message when it cannot be delivered at once,
determine if the user equipment is using a power saving mechanism, and
if the user equipment is reachable within the max retransmission time, sending, to the short message gateway, a mobile-terminating-forward-short-message-answer message indicating failure of delivery of the short message to the user equipment with a time at which the short message should be re-sent by the short message gateway.
7. The apparatus according to claim 6 , further comprising circuitry configured to
send the mobile-terminating-forward-short-message-answer message indicating delivery failure, with a time at which the short message should be re-sent by the short message gateway, without setting the user equipment not reachable flag.
8. The apparatus according to claim 6 , wherein:
the power saving mechanism includes extended idle mode discontinuous reception.
9. An apparatus comprising circuitry configured to:
receive a request message for forwarding a short message towards a user equipment over a short message delivery network including a SGs interface with a mobility management entity, the request message including a short-message-delivery-timer/short-message delivery start-time indicating the time used in a short message gateway to supervise reception of an answer message,
send the short-message-delivery-timer/short-message-delivery start-time in a paging request over the SGs interface to the mobility management entity.
10. An apparatus comprising circuitry configured to:
determine that a user equipment using a power saving mechanism becomes reachable by receiving a paging response from the user equipment, and
if the user equipment using the power saving mechanism becomes reachable, send towards a mobile switching center/visitor location register over a SGs interface a user-equipment-reachable message including a max-user-equipment-availability-time indicating a time window until when a signaling connection is maintained with the user equipment after the paging response from the user equipment.
11. The apparatus according to claim 10 , wherein the max user-equipment-availability-time indicates to a service center that the service center is to prioritize retransmission of a short message to the user equipment using the power saving mechanism.
12. The apparatus according to claim 10 , wherein said power saving mechanism includes extended idle mode discontinuous reception.
13. An apparatus comprising circuitry configured to:
receive, from a short message gateway, a request message for forwarding a short message towards a user equipment over a short message delivery network including a SGs interface with a mobility management entity,
determine that the request message includes a max retransmission time indicating for how long the short message gateway is ready to store the short message if the short message cannot be delivered at once, and
send a paging request over SGs interface to the mobility management entity, the paging request including the max retransmission time.
14. An apparatus, comprising circuitry configured to:
receive, from a mobile switching center/visitor location register, a paging request for a user equipment,
determine if the user equipment using a power saving mechanism is reachable within a max retransmission time included in the paging request, the max retransmission time indicating for how long a short message gateway is ready to store a short message when the short message cannot be delivered at once,
if the user equipment is reachable within the max retransmission time, send a user equipment unreachable message indicating delivery failure, the user equipment unreachable message including a retransmission time at which the short message should be re-sent by the short message gateway.
15. The apparatus according to claim 14 , wherein said power saving mechanism includes extended idle mode discontinuous reception.
16. An apparatus comprising circuitry configured to:
receive a user equipment unreachable message over an interface with a mobility management entity, the user equipment unreachable message including a retransmission time at which a short message should be re-sent, and
send an answer message to a short message gateway indicating failure of delivery of the short message to the user equipment, the answer message including the retransmission time at which the short message should be re-sent.