Wireless Device Fast Access via Service Assistant Information
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Solution Overview
Problem
In wireless communication systems, especially in 5G networks, there is a challenge in providing fast access to network slices when a user equipment (UE) transitions from RRC_IDLE or RRC_INACTIVE to RRC_CONNECTED, as the UE needs to be updated with slice information, and if the intended slice is not supported in the serving cell, service rejection or slow access occurs.
Innovation Solution
A method where a wireless device performs a Random Access (RA) procedure to a new cell, selecting a special RA preamble for service assistance information related to the intended slice, transmitting this information to the new cell, and receiving mobility information in response, allowing for cell reselection based on the provided information to ensure fast access to the intended network slice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transitions from RRC_IDLE or RRC_INACTIVE to RRC_CONNECTED to be updated with slice information, then the network can provide slice information to the UE, but the access process becomes slow and service cannot be provided quickly
Solution Approach 1:
The network pre-configures and broadcasts slice information in system information blocks (SIB) before the UE needs to access the network. This allows the UE to perform slice-aware cell selection during idle state without needing to transition to connected state for information updates, thereby reducing access time while maintaining information accuracy
Solution Approach 2:
The patent extracts the slice information update process from the mandatory RRC connection establishment process. By providing slice information through broadcast channels during idle state, the system separates information delivery from connection setup, allowing UEs to access services without completing full connection procedures when not necessary
2Reliability
If the intended slice is not supported in the serving cell, then the network can reject the service, but the UE cannot access the intended slice quickly and must reselect another cell
Solution Approach 1:
The network provides feedback information about supported slices through system information broadcasts and mobility information messages. This feedback mechanism enables UEs to identify cells that support their intended slices without attempting access and being rejected, thereby improving access efficiency while maintaining accurate service support matching
Solution Approach 2:
The network preemptively provides slice compatibility information through mobility information and system broadcasts before the UE attempts access. This allows the UE to perform slice-aware cell selection in advance, avoiding service rejection and reducing the need for cell reselection attempts
3Loss of information
If the UE performs a full RRC connection establishment to get slice information, then the network can provide complete information, but the process is complex and time-consuming
Solution Approach 1:
The patent segments slice information delivery into multiple stages: essential slice information is provided through system information blocks for immediate use, while detailed slice configuration is provided through mobility information and RRC messages only when needed. This segmentation allows UEs to access services with minimal information without requiring full connection establishment, reducing procedural complexity while maintaining information completeness
Data Source
AI summary
A method and apparatus for a fast access considering service assistant information in a wireless communication system is provided. A wireless device selects a new cell. The wireless device performs a Random Access (RA) procedure to the new cell. The wireless device performs a cell reselection procedure based on a mobility information. The RA procedure includes (1) selecting a special RA preamble for service assistance information related to an intended slice, (2) transmitting, to the new cell, a RA message including the service assistance information; and (3) receiving, from the new cell, a response message including the mobility information.