Secondary Cell Group Configuration Without Random Access
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling dual connectivity, particularly in configuring secondary cell groups without the need for a random access procedure, which can lead to delays and inefficiencies in network synchronization.
Innovation Solution
A communication device and method that configures a radio resource control (RRC) connection with a first cell, receives an RRC message to synchronize with a secondary cell, and transmits a complete message without performing a random access procedure if indicated, determining successful configuration by detecting a Radio Network Temporary Identifier (RNTI) within a specified time period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a random access procedure is performed for secondary cell group configuration, then connection reliability is improved, but configuration time and network latency increase
Solution Approach 1:
The patent extracts the random access procedure from the mandatory SCG configuration process. The UE can configure the secondary cell group by receiving RRC reconfiguration messages without performing the random access procedure, thereby removing this time-consuming step while maintaining connection reliability through alternative verification mechanisms.
Solution Approach 2:
The network performs preliminary actions by pre-configuring the SCG parameters and synchronization information in the RRC reconfiguration message before the UE actually needs to connect to the secondary cell. This allows the UE to quickly synchronize and configure the SCG without undergoing a full random access procedure.
2Productivity
If a random access procedure is skipped for secondary cell group configuration, then configuration speed is improved, but synchronization reliability may deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where the UE monitors downlink channels from the secondary cell and verifies successful configuration by detecting RNTI or completing synchronization within a specified time period. This feedback loop ensures synchronization reliability even without the random access procedure.
Solution Approach 2:
The network provides preliminary synchronization information and configuration parameters in advance through the RRC reconfiguration message, enabling the UE to quickly synchronize with the secondary cell while maintaining reliability through pre-established synchronization references.
3Productivity
If secondary cell group configuration is performed quickly without random access, then network efficiency is improved, but complexity of configuration management increases
Solution Approach 1:
The patent makes the RRC reconfiguration message serve multiple functions: it not only configures the SCG parameters but also provides synchronization information, timing advance commands, and configuration verification instructions. This multi-functionality reduces the need for separate procedures and simplifies overall configuration management despite the accelerated process.
Data Source
AI summary
A communication device comprises a storage device for storing instructions of receiving a radio resource control (RRC) message via a RRC connection on a first cell from a first BS, wherein the RRC message configures a secondary cell group (SCG) configuration to the communication device; synchronizing to a downlink (DL) of a second cell indicated in the SCG configuration, wherein the second cell belongs to a second BS; transmitting a RRC complete message to the first cell or a third cell of the first BS in response to the RRC message without performing a random access (RA) procedure to the second cell, if the RRC message indicates no need to perform the RA procedure to the second cell; and determining that the SCG configuration is successfully configured, when detecting a Radio Network Temporary Identifier (RNTI) on a DL channel from the second cell in a first time period.