Radio Bearer Establishment for Mobility Management
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Solution Overview
Problem
Current LTE communications systems have a poor mobility management function due to the inability to transmit RRC messages using a small cell in multi-site networks, limiting mobility enhancement.
Innovation Solution
A method for establishing a radio bearer between a second base station and user equipment (UE) to forward RRC information generated by a first base station, allowing for improved mobility management by using signaling and data radio bearers and transport bearers to facilitate message transmission between base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC messages are transmitted only by using a radio interface between a macro base station and UE, then the system structure is simple, but the mobility management function is poor and mobility cannot be enhanced
Solution Approach 1:
The patent introduces a small cell as an intermediary base station that forwards RRC messages between the macro base station and the UE. The small cell acts as a mediator that receives RRC messages from the macro base station via an interface and transmits them to the UE through a radio interface, thereby enhancing mobility management without requiring complete system restructuring
Solution Approach 2:
The patent segments the base station functionality into two parts: the macro base station that maintains overall network control and the small cell that handles local radio access and message forwarding. This segmentation allows the system to improve mobility management by distributing functions across multiple base station types while maintaining manageable complexity
2Reliability
If a small cell is used to forward RRC messages in a multi-site network, then mobility management is enhanced, but the device complexity increases due to additional interfaces and bearers
Solution Approach 1:
The small cell is designed with multi-functionality, serving both as a radio access point for UE communication and as a message forwarding intermediary. The same small cell infrastructure handles both user data transmission and RRC message routing, reducing the need for separate dedicated forwarding mechanisms and thereby limiting the increase in overall system complexity
3Adaptability or versatility
If radio bearers are established between the second base station and UE for forwarding RRC information, then message transmission capability is improved, but the device complexity increases due to additional bearer management
Solution Approach 1:
The patent implements dynamic bearer management where the small cell establishes and maintains radio bearers with the UE only when needed for RRC message forwarding. The bearers are dynamically created during mobility events and released when no longer required, allowing the system to enhance message transmission capability while managing bearer complexity on-demand rather than maintaining permanent complex bearer structures
Data Source
AI summary
Embodiments of the present invention disclose a radio bearer establishment method and a base station and relate to the communications field. The method provided in the embodiments of the present invention includes: sending, by a first base station, first request information to a second base station, so that the second base station establishes a radio bearer between the second base station and user equipment UE according to the first request information, where the radio bearer includes a signaling radio bearer SRB, or a data radio bearer DRB, or an SRB and a DRB; and receiving, by the first base station, first response information sent by the second base station, where the first response information includes radio bearer establishment information that is used to indicate, to the first base station, a success or a failure to establish the radio bearer between the second base station and the user equipment UE.