Random Access Preamble Segmentation for Dual Connectivity
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Solution Overview
Problem
Existing random access procedures do not reserve random access preambles for dual connectivity connections, leading to reduced success rates for UEs attempting to establish dual connectivity connections, as they must contend with UEs accessing standalone connections using contention-based random access.
Innovation Solution
Reserving random access preambles for UEs associated with dual connectivity sessions and utilizing contention-free random access (CFRA) to increase the success rate of the random access process for these UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contention-based random access (CBRA) is used for dual connectivity connections, then UEs can access the network using available preambles, but the success rate is reduced due to contention with other UEs
Solution Approach 1:
The patent segments the random access preamble pool by creating separate preamble groups: one group dedicated to dual connectivity connections and another for standalone connections. This segmentation eliminates contention between different connection types by assigning UEs to appropriate preamble groups based on their connection requirements, thereby improving random access success rate for dual connectivity UEs without increasing overall system complexity
Solution Approach 2:
The patent implements preliminary action by pre-configuring and reserving specific random access preambles for dual connectivity connections before the actual random access process occurs. The network node maintains a dedicated pool of preambles that are already prepared and allocated for dual connectivity UEs, eliminating the need for contention during the access process and ensuring high success rates
2Reliability
If random access preambles are reserved for dual connectivity connections, then contention is reduced and success rate improves, but the device complexity and resource management increase
Solution Approach 1:
The patent applies universality by designing a random access preamble management system that serves multiple functions: it handles both dual connectivity and standalone connections through a unified framework. The network node maintains multiple preamble pools but manages them through a single control mechanism that can dynamically allocate preambles based on connection type, reducing management complexity while maintaining dedicated resources for dual connectivity
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting preamble allocation parameters based on network conditions and connection types. The system can modify the size of dedicated preamble pools, the allocation thresholds, and the selection criteria based on current network load and dual connectivity demand, thereby optimizing reliability without requiring complex fixed-structure management
Data Source
AI summary
Embodiments of the present disclosure are directed to systems and methods for managing random access for devices seeking access to dual connectivity. Both master nodes and secondary nodes in dual connectivity have 64 available preambles that can be used for random access. By reserving preambles for devices that are requesting access to dual connectivity, a radio access network can assign random access preambles to said devices, enabling them to use contention free random access to gain access to both a master node and a secondary node. In some aspects random access preambles will only be assigned to devices requesting access to dual connectivity if they have a sufficiently high priority level.