RRC Connection Management in Cloud RAN
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Solution Overview
Problem
In wireless communication networks, particularly in 3GPP, LTE, LTE-A, and 5G networks, there is a challenge in efficiently managing radio resource control (RRC) operations, especially when a large number of devices are supported, leading to difficulties in exchanging control information and optimizing resource allocation.
Innovation Solution
The implementation of a cloud radio access network (RAN) architecture that splits RRC functionality between a central unit (RCU) and distributed units (RDUs, where RDUs communicate with UEs to perform admission management based on local load information and global load information received from the RCU, using timers to manage response times and optimize connection establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of devices are supported in the network, then network capacity increases, but control information exchange becomes challenging and latency increases
Solution Approach 1:
The patent segments the RRC functionality into two parts: RRC connection management is performed by the RDU (distributed unit) for fast local decisions, while RRC configuration and reconfiguration are managed by the RCU (central unit). This segmentation allows connection establishment to proceed quickly at the edge while centralized coordination handles overall resource management, reducing latency even as device density increases.
Solution Approach 2:
The patent introduces an intermediary mechanism where the RDU acts as a local decision-maker for connection admission, using timers to manage response times. The RDU can quickly accept or reject connections based on local load information without waiting for centralized RCU decisions, thereby reducing control information exchange latency while maintaining network-wide coordination.
2Stability of the object's composition
If centralized control is used for RRC operations, then coordination is improved, but response time and latency increase
Solution Approach 1:
The patent divides RRC control functions between centralized (RCU) and distributed (RDU) components. The RDU handles time-critical connection admission and release decisions locally, while the RCU provides centralized coordination for configuration and reconfiguration. This segmentation maintains coordination stability while improving response time for urgent operations.
Solution Approach 2:
The patent implements preliminary action by having the RDU pre-evaluate connection requests against local load information and use timers to determine admission decisions before involving the RCU. This preliminary local assessment reduces the need for back-and-forth communication, maintaining centralized coordination while significantly reducing response time.
3Productivity
If local load management is performed at RDU, then response speed improves, but global resource optimization may be compromised
Solution Approach 1:
The patent segments resource management responsibilities: the RDU performs local load management for fast connection establishment based on immediate local conditions, while the RCU performs global resource optimization through centralized configuration and reconfiguration. This segmentation allows both fast local response and reliable global optimization to coexist.
Solution Approach 2:
The patent implements feedback mechanisms where the RDU reports local load information to the RCU, which then provides centralized configuration instructions. This feedback loop ensures that local autonomous decisions at the RDU are aligned with global resource optimization goals, maintaining reliability while preserving fast connection establishment speed.
Data Source
AI summary
Embodiments of an Evolved Node-B (eNB), radio access network (RAN) central unit (RCU) and methods for radio resource control (RRC) are generally described herein. A RAN distributed unit (RDU) at an eNB may communicate with an RCU of a cloud RAN to cooperatively perform RRC functionality for the eNB 104. The RDU 105 may receive a request for an RRC connection from a User Equipment (UE), and may request global load information from the RCU. The RDU may determine whether to establish the requested RRC connection based on the global load information when a response from the RCU is received before a predetermined time. The RDU may determine whether to establish the requested RRC connection based on local load information when the response from the RCU is not received before the predetermined time.