Slice-Specific RACH Resource Pool Selection for 5G UE
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Solution Overview
Problem
Current 5G communication networks lack efficient methods for a user equipment (UE) to select and configure random-access channel (RACH) resources specific to network slices during resumption of a radio resource control connection in inactive connected mode, which affects differentiated traffic handling and service optimization.
Innovation Solution
A method and system where the UE provides slice identifiers from the non-access stratum (NAS) layer to the access stratum (AS) layer to determine the appropriate network slice for RRC connection, allowing for slice-specific RACH configuration and resource management, enabling UE-initiated mobility management and data packet-driven resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE uses a common RACH resources pool for all network slices, then the device complexity is reduced and operation is simplified, but the service differentiation and network slicing capabilities are degraded
Solution Approach 1:
The common RACH resources pool is segmented into multiple slice-specific RACH resources pools, each dedicated to a specific network slice. The UE determines which slice-specific pool to use based on the network slice identifier, enabling differentiated access while maintaining structured resource management.
Solution Approach 2:
Different RACH configuration parameters are assigned to different network slices based on their specific service requirements. Each slice-specific RACH resources pool has customized parameters optimized for its particular traffic characteristics and QoS needs.
2Productivity
If the UE selects slice-specific RACH resources pools based on network slice identifiers, then service differentiation is improved, but the device complexity and configuration overhead increase
Solution Approach 1:
The network pre-configures multiple slice-specific RACH resources pools with their respective parameters before the UE needs to access them. The UE stores these configurations and can quickly select the appropriate pool based on the network slice identifier without performing complex real-time calculations.
Solution Approach 2:
The network slice identifier acts as an intermediary that links the UE's service requirements to the appropriate RACH resources pool. This identifier simplifies the selection process by providing a direct mapping between service type and resource pool.
3Measurement precision
If the UE provides slice identifiers from NAS layer to AS layer, then the accuracy of slice selection is improved, but the information processing overhead increases
Solution Approach 1:
The slice identifier information is extracted from the NAS layer and provided to the AS layer only when needed for RACH procedure initiation. This selective information transfer reduces unnecessary signaling overhead while ensuring accurate slice identification when required.
Data Source
AI summary
A method and system for accessing a network slice specific random-access channel resources pool at a user equipment is presented. The user equipment is in connected-mode with an inactive state and triggers a random-access procedure for resumption of a radio resource control connection. Therefore, at least one slice identifier from a non-access stratum layer to an access stratum layer is provided and at least one network slice to use for the radio resource control connection is determined based on the provided at least one slice identifier.