D2D Communication PLMN Identity Determination in Multi-PLMN Networks
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and LTE-Advanced networks, device-to-device (D2D) communication faces challenges when multiple public land mobile networks (PLMNs) share the same radio access network, leading to incorrect determination of PLMN identities and authorization issues during proximity-based service (ProSe) operations.
Innovation Solution
A communication device and method that involve receiving an announcement message with a ProSe Application Code, obtaining system information with multiple PLMN identities, setting a monitored PLMN identity, and transmitting a match report message to ensure accurate identification and authorization of PLMN identities, thereby resolving the issue of shared PLMN identities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an eNB broadcasts multiple PLMN identities to support multiple PLMNs sharing the same radio access network, then the coverage and service capability are improved, but the monitoring UE cannot correctly determine the monitored PLMN identity leading to authorization errors
Solution Approach 1:
The patent introduces an intermediary mechanism where the announcement message serves as a mediator between the announcing UE and the monitoring UE. The announcement message carries the ProSe Application Code and explicitly indicates the monitored PLMN identity, allowing the monitoring UE to correctly identify the monitored PLMN even when multiple PLMN identities are broadcast by the eNB. This intermediary information resolves the ambiguity caused by multiple PLMN identities in the system information.
2Reliability
If the ProSe function checks authorization based on PLMN identity, then the security and authorization control are improved, but incorrect PLMN identity reporting causes improper authorization decisions
Solution Approach 1:
The patent applies preliminary action by having the monitoring UE determine the monitored PLMN identity in advance, before the authorization check is performed by the ProSe function. The monitoring UE uses the announcement message to identify the correct monitored PLMN and includes this information in the match report message. This preliminary determination ensures that the ProSe function receives accurate PLMN identity information for authorization decisions, preventing improper authorization outcomes.
3Reliability
If the monitoring UE reports PLMN identity in the match report message, then the ProSe function can verify authorization, but the UE cannot distinguish which PLMN identity to report when multiple are received
Solution Approach 1:
The announcement message acts as an intermediary that carries the ProSe Application Code and explicitly indicates which PLMN identity should be monitored. This intermediary information simplifies the monitoring UE's logic by providing a direct mapping between the received announcement message and the correct PLMN identity to report, eliminating the need for complex selection logic when multiple PLMN identities are broadcast by the eNB.
Data Source
AI summary
A communication device for handling a device-to-device (D2D) communication comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprises receiving an announcement message comprising a proximity-based service (ProSe) Application Code comprising a public land mobile network (PLMN) identity; receiving system information comprising a plurality of PLMN identities; setting a monitored PLMN identity to the PLMN identity, if the plurality of PLMN identities comprises the PLMN identity; and transmitting a match report message comprising the monitored PLMN identity.