Mobile Station RRC Connection Setup in WCDMA
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Solution Overview
Problem
In WCDMA mobile communication systems, the 'ping-pong phenomenon' occurs when a mobile station attempts to set up an RRC connection in a second communication scheme's cell, which is congested, leading to repeated 'RRC Connection Requests' to the first communication scheme's network device.
Innovation Solution
A mobile communication method where the mobile station transmits a connection setup request signal with or without its radio access capability to the network device of the first communication scheme, based on triggers such as connection attempts or access restrictions in the second scheme, to avoid redirection to the second scheme when it is congested or restricted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mobile station transmits RRC Connection Request to the second communication scheme's cell, then connection setup in the second scheme is attempted, but the ping-pong phenomenon occurs when the cell is congested
Solution Approach 1:
The network device performs preliminary assessment of the second communication scheme cell's congestion status before redirecting the mobile station. By checking cell status in advance and only issuing redirection instructions when the cell is not congested, the system avoids sending mobile stations to congested cells, thereby preventing the ping-pong phenomenon while maintaining connection setup efficiency
Solution Approach 2:
The network device monitors the congestion status of the second communication scheme cell and provides feedback by selectively issuing redirection instructions. When congestion is detected, the network device withholds redirection instructions, allowing mobile stations to remain in the first communication scheme. This feedback mechanism dynamically adjusts redirection behavior based on real-time cell conditions, preventing repeated connection failures
2Adaptability or versatility
If the network device issues RRC Connection Reject to redirect to the second communication scheme, then the mobile station attempts connection in the second scheme, but repeated requests occur when the second scheme cell is congested
Solution Approach 1:
The network device applies preliminary anti-action by assessing cell congestion status before issuing redirection instructions. When the second communication scheme cell is congested, the network device proactively prevents redirection attempts by not issuing RRC Connection Reject messages. This preliminary protective measure stops the harmful ping-pong phenomenon before it can occur, while still allowing mobile stations to utilize multi-RAT capabilities when conditions are favorable
Data Source
AI summary
A mobile communication method according to the present invention includes a step of a radio network controller of a first communication scheme transmitting an instruction signal to a mobile station UE in a case where a radio access capability of the mobile station UE is contained in the received connection setup request signal, the instruction signal instructing the mobile station UE to make an attempt to set up a connection in a cell of a second communication scheme, and a step of the mobile station UE setting up the connection in the cell of the second communication scheme in response to the received instruction signal, wherein in the mobile station UE transmits a connection setup request signal not containing the radio access capability of the mobile station UE, in a case where the mobile station UE detects the predetermined trigger but the attempt to setup the connection in the cell of the second communication scheme has been made a predetermined number of times or more within a predetermined period of time.