Multi-mode Device EUTRA Capability Transmission for GSM Handovers
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Solution Overview
Problem
The existing GSM wireless communication systems lack a method to transmit EUTRA capability information from a multi-mode device to the GSM network, preventing successful inter-RAT handovers to the LTE system and limiting the device's access to higher-QoS services within EUTRAN coverage.
Innovation Solution
A communication device and method that include capability information in a radio resource message, autonomously sending this information to the GSM network when LTE capabilities change, enabling the GSM network to prepare appropriate handover configurations for inter-RAT transitions to the LTE system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the MS supports multi-mode (GSM and LTE) with stored capability information, then the device can access higher-QoS services in EUTRAN coverage, but the GSM network cannot perform inter-RAT handover without EUTRA capability information transmission method
Solution Approach 1:
The MS proactively transmits EUTRA capability information to the GSM network before handover is needed, storing it in capability information storage and initiating transmission through indication information. This preliminary action ensures the network has the necessary capability data ready when inter-RAT handover is required, eliminating the handover failure issue.
Solution Approach 2:
The patent introduces capability information storage and indication information as intermediaries to bridge the GSM network and EUTRA capability data. The indication information acts as a trigger mechanism that mediates between the MS's multi-mode capability and the GSM network's handover decision-making process.
2Ease of operation
If the MS autonomously sends capability information in radio resource messages, then the GSM network can prepare appropriate handover configurations, but the device complexity increases due to autonomous transmission control
Solution Approach 1:
The MS autonomously manages its own capability information transmission by monitoring changes in EUTRA capability, determining when transmission is needed, and initiating the transmission process itself through radio resource messages. This self-service approach eliminates the need for network-side polling or complex signaling protocols, reducing overall system complexity while enabling proactive handover preparation.
3Reliability
If the MS transmits EUTRA capability information proactively, then seamless inter-RAT handover is enabled, but the loss of time occurs during capability information transmission and processing
Solution Approach 1:
The MS transmits EUTRA capability information in advance through radio resource messages before handover is actually needed. By performing this action preliminarily, the capability information is already available in the network when handover is triggered, eliminating delays that would occur if capability information had to be transmitted at the moment of handover.
Solution Approach 2:
The MS continuously monitors changes in EUTRA capability information and maintains an up-to-date capability profile ready for transmission. This continuous preparation ensures that when handover is needed, the capability information is immediately available for transmission, minimizing any potential time loss.
Data Source
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AI summary
A method of transmitting radio access capability for a mobile device in a first wireless communication system includes including capability information (216) of the mobile device, corresponding to a second wireless communication system, in a radio resource message (410), and sending the radio resource message to a network of the second wireless communication system (420).