Multi-Sim COT Sharing via Merged LBT
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Solution Overview
Problem
In wireless communication systems, especially in multi-subscriber identity module (MultiSim) devices, the existing listen-before-talk (LBT) procedure for channel occupancy time (COT) sharing in unlicensed bands is inefficient due to separate LBT overhead for each subscription, leading to resource underutilization and increased channel access uncertainty.
Innovation Solution
Implementing COT sharing across different subscriptions in MultiSim devices, where a first communication signal is transmitted based on a first subscriber identity during a first portion of the COT, and a second communication signal is transmitted based on a second subscriber identity during a second portion of the COT, utilizing COT sharing information such as timing and channel access priority to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate LBT procedures are performed for each subscription in MultiSim devices, then channel access control is maintained, but overhead increases and resource utilization decreases
Solution Approach 1:
The patent combines multiple LBT procedures into a single shared LBT process for MultiSim devices. Instead of performing separate LBT for each subscription, the device performs one LBT procedure and shares the resulting COT across multiple subscriptions, thereby reducing overhead while maintaining channel access control through proper timing and priority management.
Solution Approach 2:
The patent implements a universal COT sharing mechanism where a single COT acquired by one subscription can be utilized by multiple subscriptions within the same device. This multi-functional approach allows the same channel occupancy period to serve multiple communication purposes, improving resource utilization while maintaining appropriate access control through subscription-specific timing parameters.
2Reliability
If separate LBT procedures are performed for each subscription, then individual channel access control is ensured, but channel access uncertainty increases
Solution Approach 1:
By merging multiple LBT procedures into a single shared LBT process, the patent reduces the cumulative time and uncertainty associated with performing multiple independent LBT operations. The shared COT provides a deterministic time window that multiple subscriptions can utilize, eliminating the random variability introduced by sequential LBT attempts.
3Productivity
If COT is shared across different subscriptions, then resource utilization efficiency improves, but device complexity increases
Solution Approach 1:
The patent segments the COT into subscription-specific time portions using timing parameters such as offset values and durations. Each subscription is allocated a specific time window within the shared COT based on its priority and communication requirements, allowing efficient resource utilization while managing device complexity through structured time division rather than complex coordination protocols.
4Productivity
If COT sharing is implemented in MultiSim devices, then spectral sharing performance improves, but overhead management becomes more complex
Solution Approach 1:
The patent performs preliminary configuration of COT sharing parameters before actual communication occurs. Timing parameters, offset values, and duration information are predetermined and stored, allowing the device to efficiently share COT across subscriptions without requiring complex real-time negotiations or dynamic adjustments during operation, thus improving spectral sharing while managing overhead complexity.
Data Source
AI summary
Wireless communications systems and methods related to channel occupancy time (COT) sharing in multi-subscriber identity module (MultiSim) devices are provided. A user equipment (UE) transmits, based on a first subscriber identity during a first portion of a channel occupancy time (COT) in an unlicensed band, a first communication signal. The UE transmits, based on a second subscriber identity during a second portion of the COT, a second communication signal, the second subscriber identity being different from the first subscriber identity.