Radio Bearer Setup with Unified Tunnel Identifiers
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Solution Overview
Problem
The introduction of flow-based QoS control in radio communication systems complicates the establishment of Dual Connectivity (DC) by eliminating the one-to-one correspondence between data radio bearers and core network bearers, making it unclear whether to establish a PDN tunnel and S1 bearer between the SeNB and CN-UP, which complicates the existing sequence.
Innovation Solution
A radio communication system that includes a master radio base station and a network device, where the master radio base station transmits a bearer setup instruction to establish a first tunnel to the master radio base station and a second tunnel to the secondary radio base station, with the network device setting the same identifiers for the tunnel endpoint identifiers on both tunnels, allowing for the establishment of bearers without complicating the sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flow-based QoS control is introduced, then QoS control for every IP flow is achieved, but the one-to-one correspondence between data radio bearer and core network bearer is eliminated, making it unclear whether to establish PDN tunnel and S1 bearer between SeNB and CN-UP
Solution Approach 1:
The patent segments the bearer establishment process into distinct phases: first establishing the PDN tunnel between CN-UP and SeNB with a placeholder TEID, then later binding the actual TEID when the S1 bearer is established. This segmentation allows the system to handle flow-based QoS control while maintaining clarity in the establishment sequence by separating the tunnel setup from the bearer setup.
Solution Approach 2:
The patent applies preliminary action by establishing the PDN tunnel between CN-UP and SeNB in advance, using a placeholder TEID value before the actual S1 bearer establishment. This preliminary tunnel setup removes the uncertainty about whether to establish the tunnel, as it is done proactively before the bearer setup occurs, thereby simplifying the overall process despite flow-based QoS control.
2Reliability
If a sequence is added for MeNB and CN-CP to establish tunnel and core network bearer between SeNB and CN-UP, then the problem of unclear tunnel establishment is solved, but the existing sequence is drastically changed and complicated
Solution Approach 1:
The patent merges the tunnel establishment process with the existing bearer setup流程 by having the CN-UP establish the PDN tunnel to SeNB as part of the bearer setup response. Instead of adding a separate preliminary sequence, the tunnel establishment is combined with the bearer setup flow, using a placeholder TEID that is later replaced with the actual TEID. This merging approach maintains reliability while avoiding drastic sequence changes.
Solution Approach 2:
The patent introduces a placeholder TEID as an intermediary element that temporarily represents the tunnel endpoint identifier during the bearer setup process. This intermediary allows the system to proceed with bearer establishment before the actual TEID is known, thereby maintaining sequence simplicity while ensuring tunnel establishment clarity. The placeholder is later replaced with the real TEID without requiring a complete sequence redesign.
3Device complexity
If the same identifiers are set to tunnel endpoint identifiers on network device side for both first tunnel and second tunnel, then Dual Connectivity is implemented without complicating the sequence, but identifier management becomes critical
Solution Approach 1:
The patent applies parameter changes by dynamically modifying the TEID value from a placeholder to an actual identifier. Initially, a placeholder TEID (such as 0 or a predefined value) is used to allow sequence simplicity during bearer setup. Later, the TEID parameter is changed to the actual tunnel endpoint identifier once the tunnel is fully established. This parameter transformation maintains sequence simplicity while managing identifier information correctly.
Data Source
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AI summary
A radio communication method includes a step in which a MeNB (210) transmits a bearer setup instruction to establish a bearer including a first tunnel and a second tunnel based on a setup request, and a step in which a CN-UP (300) establishes the first tunnel and the second tunnel based on the bearer setup instruction. The CN-UP (300) sets the same identifiers to a TEID on the CN-UP (300) side of the first tunnel and a TEID on the CN-UP (300) side of the second tunnel.