Configured Grant Timing for Layer 1/2 Cell Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing cell switch procedures, particularly in heterogeneous networks with varying coverage areas and traffic loads, leading to suboptimal resource allocation and user experience.
Innovation Solution
Implementing a configured grant mechanism for cell switch procedures that adapts to network conditions, allowing wireless devices to selectively apply protocols based on criteria such as traffic load, device capabilities, and network configurations, thereby optimizing resource allocation and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cell switch procedure is performed in a heterogeneous network, then user experience and service continuity are improved, but resource allocation efficiency deteriorates due to suboptimal resource management
Solution Approach 1:
The network configures multiple configured grants with different parameters (grant 0, grant 1, grant 2) in advance before the cell switch occurs. Each configured grant is pre-configured with specific uplink resources, timing, and frequency parameters. When a cell switch is needed, the UE can immediately switch between pre-configured grants without requiring real-time resource allocation negotiations, thus maintaining service continuity while optimizing resource allocation efficiency.
2Productivity
If configured grants are used for cell switch, then resource utilization is improved, but system complexity increases due to multiple grant configurations
Solution Approach 1:
Multiple configured grants are designed to serve multiple purposes: they provide uplink resources for initial access, handover, and cell switch procedures simultaneously. Each configured grant can be activated or deactivated based on the current network condition and UE state, allowing the same mechanism to handle various scenarios without requiring separate dedicated procedures for each case.
Solution Approach 2:
The system manages complexity by dynamically changing parameters of configured grants (such as time offset, frequency resources, and grant validity) based on network conditions rather than maintaining fixed complex structures. The network can activate or deactivate specific configured grants through simple MAC CE commands or DCI indicators, reducing the operational complexity despite having multiple grant configurations.
Data Source
AI summary
A method can include transmitting, by a wireless device, a capability message comprising a field indicating a time gap of the wireless device to complete a procedure of a layer 1 or layer 2 triggered mobility (LTM) procedure. The method can also include receiving, by the wireless device, a radio resource control configuration message comprising a configuration of a candidate cell for the LTM procedure. The configuration includes a configured grant and indicates a time resource for an uplink transmission. The method can further include receiving, by the wireless device in a time interval, a medium access control control element indicating cell switch to the candidate cell. The method can further include transmitting, by the wireless device via the candidate cell and the time resource, the uplink transmission, wherein the time resource is after the time gap plus an offset from the time interval.