CWIP Aggregation for Wireless Handover Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in LTE networks, there is a challenge in efficiently handling data transmissions during handovers and RRC connection reestablishments, as existing technologies do not effectively manage the integration of cellular and WLAN connections, leading to issues with IPsec tunnel configurations and packet data convergence protocol (PDCP) service data units (SDUs) transmission.
Innovation Solution
The implementation of a communication device and method that performs Cellular/WLAN Radio Level Integration with IPsec Tunnel (CWIP) configurations, including CWIP encapsulation protocol (CWIPEP) data units transmission, radio resource control (RRC) connection reestablishments, and handovers, ensuring successful transmission of PDCP SDUs by managing radio bearers and IPsec tunnels across cellular and WLAN connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CWIP aggregation configuration is used to transmit data over radio bearers, then data throughput is improved, but transmission reliability deteriorates during handover and RRC reestablishment procedures
Solution Approach 1:
The patent applies preliminary action by stopping CWIPEP PDU transmission before handover or RRC reestablishment is completed. The device determines whether to stop transmission based on the handover indicator bit in RRC reconfiguration messages or RRC reestablishment messages, preventing unreliable transmission during transition periods while maintaining throughput during stable connections.
2Stability of the object's composition
If PDCP reestablishment is performed to maintain connection during handover, then connection stability is improved, but data transmission continuity deteriorates due to potential loss of CWIPEP PDU
Solution Approach 1:
The patent applies preliminary action by determining before PDCP reestablishment whether CWIPEP PDU transmission should be stopped. The device checks the handover indicator bit or reestablishment message to decide in advance whether to stop transmission, preventing data loss during the reestablishment process while maintaining connection stability.
3Reliability
If CWIPEP PDU transmission is stopped during handover to ensure reliability, then transmission reliability is improved, but data loss increases due to unsent PDCP SDU
Solution Approach 1:
The patent applies preliminary action by determining before handover or reestablishment whether to stop CWIPEP PDU transmission based on the handover indicator bit. This allows the system to stop transmission in advance to ensure reliability while minimizing data loss by checking whether PDCP SDU has been successfully sent before stopping.
Solution Approach 2:
The patent applies feedback by using the handover indicator bit in RRC reconfiguration messages and reestablishment messages to determine whether to stop CWIPEP PDU transmission. This feedback mechanism ensures that transmission is stopped only when necessary, balancing reliability with data loss prevention.
Data Source
AI summary
A first communication device for communicating with a second communication device according to a Cellular network/wireless local area network (WLAN) Radio Level Integration with Internet Protocol Security (IPsec) Tunnel (CWIP) comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute the instructions stored in the storage device. The instructions comprise performing a CWIP configuration and a CWIP aggregation configuration; transmitting a plurality of CWIP Encapsulation Protocol (CWIPEP) protocol data units (PDUs) over a radio bearer (RB) via a cellular connection or a WLAN to the second communication device, in response to the CWIP configuration and the CWIP aggregation configuration; performing a radio resource control (RRC) connection reestablishment or a handover; and stopping transmitting any CWIPEP PDU over the RB to the second communication device, after completing the RRC connection reestablishment or the handover.