The Messages-Waiting is the service that enables the public network to provide the information to the Home Location Register (HLR) stating that there is a message waiting to be delivered to a Mobile Station (MS) in the Service Center (SC) with the associated Mobile Switching Center (MSC) or the Serving GPRS Support Node (SGSN). Basically it states the current position of MS to the HLR with the information that there is a pending message to the MS.
The service element is only used in case of previous unsuccessful delivery attempts due to temporarily absent mobile or MS memory capacity exceeded. This information, the Messages-Waiting-Indication (MWI), consists of
In the HLR
- Messages-Waiting-Data (MWD)
- Mobile-station-Not-Reachable-for-GPRS (MNRG)
- Mobile-Station-Not-Reachable-Flag (MNRF)
- Mobile-Not-Reachable-Reason (MNRR)
- Mobile-Station-Memory-Capacity-Exceeded-Flag (MCEF)
In the SGSN
- Mobile-station-Not Reachable-for-GPRS (MNRG)
In the Visitor Location Register (VLR)
- Mobile-Station-Not-Reachable-Flag (MNRF) located in the VLR
The MWD shall contain a list of addresses (SC-Addr) of SCs which have made previous unsuccessful delivery attempts of a message. In order to be able to send alert messages to every SC which has made unsuccessful delivery attempts to an MS, the HLR shall store the MSIsdn-Alert together with references to the SC addresses.
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