Multi-USIM UE Busy Status Signaling via PRACH Preamble
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Solution Overview
Problem
In wireless communication systems, multi-USIM devices face challenges in coordinating network connections, leading to performance degradations and resource wastage when busy with one network, as they cannot simultaneously establish connections with multiple networks, and networks are unaware of the UE's busy state.
Innovation Solution
A user equipment (UE) transmits a Physical Random Access Channel (PRACH) preamble to inform the network that it is busy with another connection, using specific parameters to uniquely identify the UE's state, allowing the network to refrain from initiating connection requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-USIM UE attempts to establish connections with multiple networks simultaneously, then the UE can access services from multiple networks, but network resources are wasted when the UE is busy with one network and cannot respond to connection requests from other networks
Solution Approach 1:
The network is informed in advance about the UE's busy state through pre-configured indication mechanisms. When a UE is busy with one network, it can preemptively signal this status to other networks before those networks initiate connection attempts, allowing them to refrain from wasting resources on futile connection procedures.
Solution Approach 2:
The system implements feedback mechanisms where the UE provides status information back to the networks about its availability. Through indicators such as specific RACH preamble selections or uplink message content, the UE continuously feedbacks its connection status, enabling networks to adapt their connection attempts based on real-time UE availability.
2Productivity
If networks continuously attempt to establish connections with multi-USIM UEs, then connection establishment can occur when available, but performance degrades due to unnecessary connection attempts when the UE is busy
Solution Approach 1:
The network performs preliminary checks before initiating connection attempts by first verifying the UE's availability status through received indication messages. This preliminary action prevents futile connection attempts from the outset, improving both the efficiency and reliability of the connection establishment process.
Solution Approach 2:
The patent introduces intermediary signaling mechanisms (such as specific RACH preambles, uplink messages containing availability indicators, or network-side indication messages) that act as mediators between the UE's busy state and the network's connection decisions. These intermediaries convey availability information without requiring direct real-time communication, enabling smooth coordination.
3Adaptability or versatility
If the network is unaware of the UE's busy state, then the UE can maintain connections with multiple networks, but system capacity is reduced due to wasted paging and connection resources
Solution Approach 1:
The indication mechanism segments the communication by separating availability signaling from actual connection procedures. The UE sends dedicated availability indication messages (through specific preambles, uplink messages, or network-side indicators) that independently convey busy status without interfering with the multi-network registration capability. This segmentation allows networks to receive clear status information while maintaining the UE's ability to be registered with multiple networks.
Data Source
AI summary
A user equipment (UE) for supporting multiple-universal subscriber identity module (multi-USIM) operations among a first base station associated with a first network and a second base station associated with a second network is disclosed. the UE includes one or more non-transitory computer-readable media having computer-executable instructions embodied thereon, and at least one processor coupled to the one or more non-transitory computer-readable media. The processor is configured to execute the computer-executable instructions to transmit, through transmitting circuitry of the UE, a physical random access channel (PRACH) preamble to the second base station associated with the second network. The PRACH preamble indicates to the second base station that the UE is not to begin a connection establishment procedure with the second network.