NR RRC Connection Setup Optimization via Default SRB1
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Solution Overview
Problem
Current radio access networks, particularly in 3GPP LTE, face inefficiencies in idle-active transitions due to optimized design around worst-case scenarios, leading to increased delays in connecting user equipment (UE) to the network, especially in next-generation (NG) networks where these issues are more pronounced.
Innovation Solution
The proposal involves optimizing the RRC connection setup process by increasing the size of RACH message 3, introducing a new message 'msg 3.5' to include additional information from message 5, and using a default SRB1 configuration to reduce the number of messages and processing delays, thereby streamlining the idle-active transition and connection establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RRC connection setup process uses the traditional multi-message exchange protocol, then compatibility with existing 3GPP networks is maintained, but connection establishment delay increases
Solution Approach 1:
The patent combines multiple separate messages (RRC Connection Request, RACH Preamble, and additional information messages) into a single integrated message exchange. Specifically, Message 3 of the RACH procedure is enhanced to include both the RRC Connection Request and previously separate information elements, reducing the total number of messages and processing steps required for connection establishment.
Solution Approach 2:
The patent performs preliminary actions by pre-configuring default SRB1 parameters and pre-including multiple information elements in Message 3 before actual data transmission. This allows the network to prepare configuration parameters in advance and reduces the need for subsequent reconfiguration messages, thereby decreasing overall connection setup time.
2Productivity
If the RACH message 3 size is increased to include additional information, then the number of messages is reduced, but message processing complexity increases
Solution Approach 1:
The patent segments the enhanced Message 3 into distinct information elements and fields, each with specific functions. The message structure is divided into mandatory fields (such as UE identity, connection request indicator) and optional fields (such as additional capability information), allowing the receiver to process only the relevant portions based on configuration and context.
Solution Approach 2:
The patent changes the parameter structure of Message 3 by introducing new information elements and modifying existing field formats. Default SRB1 configuration parameters are established to standardize the message structure, enabling more efficient parsing and processing while maintaining backward compatibility through version indicators and optional field markers.
3Loss of information
If multiple separate messages are used for connection setup, then information can be transmitted systematically, but the overall transition time from idle to active state increases
Solution Approach 1:
The patent merges multiple information elements that were previously transmitted in separate messages into a single enhanced Message 3. This includes combining the RRC Connection Request, UE capability information, and other configuration parameters into one comprehensive message exchange, thereby reducing the total transition time from idle to active state while maintaining complete information transmission.
Data Source
AI summary
Systems and methods of optimizing NR RRC connection establishment are described. The UE transmits a RRC request for establishment of a connection to a gNB. The RRC request is transmitting on a SRB1 rather than SRB0. The SRB1 has a default SRB1 configuration stored in memory. A response from the gNB is received and acknowledged using the SRB1 or a SRB1 having a SRB1 configuration provided in the response. The RRC request is a RRCReestablishmentRequest or RRCResumeRequest.