Mobile Device Proximity Information Transmission Handling
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and UMTS, mobile devices face issues with radio link failures and system failures when attempting to transmit proximity information during handover or RRC connection re-establishment procedures, especially when the target base station does not support inbound mobility to CSG/hybrid cells, leading to confusion and potential system failures.
Innovation Solution
A method and device for handling proximity information transmission, where the mobile device initiates handover or RRC connection re-establishment procedures and only transmits proximity information after confirming the target base station supports inbound mobility, as configured by an RRC message, thereby avoiding system failures by ensuring proper configuration and timing of proximity information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE transmits proximity information to the network during handover or RRC connection re-establishment procedure, then the UE can trigger inbound mobility to CSG/hybrid cells, but the target eNB may not support inbound mobility causing system failure
Solution Approach 1:
The UE performs preliminary actions by detecting CSG cells and preparing proximity information before handover, but only transmits this information after confirming the target eNB supports inbound mobility through proper RRC message handling, thus avoiding system failure while enabling mobility when supported
Solution Approach 2:
The network provides feedback through RRC messages (such as RRCConnectionReconfiguration with inboundHO-Support indicator) to inform the UE whether the target eNB supports inbound mobility. The UE uses this feedback to determine whether to transmit proximity information, creating a closed-loop control that prevents system failure
2Productivity
If the UE sends RRCConnectionReconfigurationRequest message with proximity information to the second eNB, then the UE attempts to trigger handover, but the second eNB cannot process the message causing confusion or system failure
Solution Approach 1:
The UE performs preliminary verification by checking whether the target eNB supports inbound mobility before sending the RRCConnectionReconfigurationRequest message with proximity information. This preliminary action prevents sending incompatible messages to eNBs that cannot process them
Solution Approach 2:
The invention applies preliminary anti-action by preventing the transmission of proximity information when the target eNB does not support inbound mobility. This counter-measure blocks the harmful action (sending unsupported messages) before it can cause system failure
3Adaptability or versatility
If the UE continuously transmits proximity information, then the UE can maintain mobility capability, but unnecessary transmissions may occur during procedures where the network does not support it
Solution Approach 1:
The UE dynamically adjusts its proximity information transmission behavior based on network conditions and RRC message configurations. Instead of continuous transmission, the UE transmits proximity information only when appropriate RRC messages indicate the network supports inbound mobility, making the transmission behavior adaptive to current network capabilities
Data Source
AI summary
A method of handling proximity information transmission for a mobile device in a wireless communication system is disclosed. The method comprises initiating a handover procedure triggered by receiving a handover command or an radio resource control (RRC) connection re-establishment procedure, detecting a closed subscriber group (CSG) cell of a whitelist in the mobile device, wherein the whitelist provides a list of accessible CSG cells for the mobile device, and determining whether to perform the proximity information transmission according to an RRC message received from a network of the wireless communication system, wherein the RRC message includes a configuration of the proximity information transmission.