2-Step Random Access RRC Delivery via MsgB for Lower Latency
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in 2-step random access procedures, particularly in the transmission of downlink radio resource control (RRC) messages, which are desired to be improved for enhanced data and multimedia content transmission.
Innovation Solution
The transmission of RRC messages is facilitated through a 2-step random access procedure, involving a first downlink RRC message sent via unicast or group-cast transmission, optimizing the communication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 4-step random access procedure is used, then reliability of connection establishment is improved, but transmission latency and procedure complexity increase
Solution Approach 1:
The patent combines multiple messages into fewer transmission steps. Specifically, it merges the RRC message transmission with the random access procedure by embedding RRC messages in MsgB (which contains RAR and contention resolution information), thereby reducing the number of separate transmission steps while maintaining connection reliability and reducing latency
Solution Approach 2:
The patent performs preliminary configuration by including RRC messages in advance within MsgB during the random access procedure. This allows the UE to receive critical configuration information (such as uplink grant, timing advance, and RRC setup) before completing the full connection establishment, thereby reducing subsequent transmission latency
2Reliability
If 4-step random access procedure is used, then connection establishment reliability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent merges multiple functions into fewer messages. MsgB simultaneously carries RAR (Random Access Response), contention resolution information, and RRC messages, reducing the number of separate signaling steps from four to two while maintaining all necessary functions for reliable connection establishment
Solution Approach 2:
MsgB is designed as a multi-functional message that serves multiple purposes: it provides random access response, resolves contention, and delivers RRC configuration messages. This universal message structure reduces procedural complexity by eliminating the need for separate dedicated messages for each function
3Reliability
If RRC messages are transmitted via unicast, then message delivery reliability is improved, but signaling overhead and network resource consumption increase
Solution Approach 1:
The patent combines unicast RRC message transmission with the group-cast MsgB transmission. By embedding UE-specific RRC messages within MsgB (which is transmitted to multiple UEs simultaneously), the system achieves reliable unicast delivery without requiring separate dedicated signaling resources, thereby reducing overall signaling overhead
Data Source
AI summary
Apparatuses, systems, and methods for a wireless device to perform 2-step random access procedures. The disclosure identifies techniques for transmitting and receiving downlink connection configuration information, such as a radio resource control message, in a 2-step random access procedure.