Early UE Context Transfer in L3 Call Setup
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Solution Overview
Problem
In current network architectures, user equipment (UE) is unable to efficiently communicate slice preferences during the early phase of the random access channel process, leading to increased processing load on resource-constrained DU-c components and prolonged L3 call setup times.
Innovation Solution
The proposed solution involves an apparatus and method that allow the UE to send slice preferences and service latency information in message 3 of the RACH process, enabling proactive association of the UE context with a slice-specific distributed unit component before the core network's admission decision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If UE sends slice preferences during the RACH process (message 3), then the L3 call setup time is reduced and processing load on DU-c is decreased, but the protocol complexity and message structure complexity increase
Solution Approach 1:
The UE sends slice preference information in message 3 of the RACH process, which is an early stage message in the random access procedure. This preliminary transmission of slice information allows the network to prepare and associate UE context with slice-specific distributed unit components before the core network's admission decision, thereby reducing the L3 call setup time without requiring additional dedicated signaling messages later in the procedure
Solution Approach 2:
The slice preference information is integrated into the existing message 3 structure of the RACH process rather than being transmitted as a separate dedicated message. This merging approach allows the slice information to be conveyed within the already-established signaling framework, minimizing additional protocol complexity while achieving the goal of early slice indication
2Productivity
If UE sends slice preferences early in RACH process, then resource allocation efficiency is improved and bottlenecks are prevented, but the message structure and information elements become more complex
Solution Approach 1:
By transmitting slice preference information in message 3 during the RACH process, the network receives early indication of the UE's slice requirements. This enables the network to proactively allocate resources and associate the UE context with the appropriate slice-specific distributed unit components before the core network makes its admission decision, improving resource allocation efficiency and preventing bottlenecks
Solution Approach 2:
The slice preference information is transmitted using a dedicated information element within message 3, allowing the slice-specific requirements to be handled by specialized distributed unit components. This local quality approach enables different parts of the network to be optimized for different slice types based on their specific requirements, improving overall resource allocation efficiency
Data Source
AI summary
A method and an apparatus to perform sending towards a communication network node, information comprising a radio resource control setup request message an add slice request of at least one requested slice for fulfillment of at least one service characteristic, receiving an indication of one of an acceptance or a rejection by the network node of each of the at least one requested slice. The method and the apparatus is configured to perform receiving information comprising, a radio resource control setup request message for call admission with a network device of the communication network, wherein the information comprises an add slice request indication of at least one requested slice for fulfillment of at least one service characteristic for the network device and, based on the receiving, determining one of an acceptance or a rejection by the network node of each of the at least one requested slice.