LTE Handover Bearer Acceptance Verification
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Solution Overview
Problem
Current handover mechanisms in LTE wireless networks experience latency due to the need for multiple messages between source and target eNBs when not all mandatory bearers required by applications can be accepted by the target eNB, leading to inefficient handover processes and potential call disruptions.
Innovation Solution
Incorporating a method where the handover request message includes a list of mandatory bearers, allowing the target eNB to determine upfront if it can accept all required bearers, and responding with a handover preparation failure message if not, thereby eliminating the need for handover cancel messages and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target eNB accepts all mandatory bearers required by the application, then handover success rate is improved, but handover latency increases due to multiple message exchanges
Solution Approach 1:
The source eNB performs preliminary actions by identifying and listing all mandatory bearers required by the application in the handover request message before initiating the handover process. This allows the target eNB to evaluate bearer acceptance capability in advance, avoiding subsequent handover failures and multiple message exchanges, thus resolving the contradiction between handover success rate and latency
2Reliability
If multiple handover messages are exchanged between source and target eNBs, then bearer acceptance verification is improved, but handover process complexity increases
Solution Approach 1:
The handover request message includes a preliminary list of mandatory bearers, enabling the target eNB to verify bearer acceptance capability in advance and make a definitive acceptance or rejection decision. This eliminates the need for multiple subsequent handover messages and complex verification procedures, reducing handover process complexity while maintaining reliability
Solution Approach 2:
The invention extracts the bearer acceptance verification function from the multi-message handover exchange sequence and consolidates it into a single evaluation step at the target eNB. By separating the bearer verification decision from the general handover messaging flow, the process becomes simpler and more efficient
Data Source
AI summary
An example method for handover in a wireless telecommunication network environment is provided and includes receiving a handover request from a first Evolved Universal Terrestrial Radio Access Network (E-UTRAN) nodeB (eNB) for an application executing at a user equipment (UE) in a long term evolution (LTE) wireless network environment, the handover request being sent by the first eNB to a second eNB, determining, at the second eNB, whether substantially all mandatory bearers required by the application can be accepted at the second eNB, and responding by the second eNB to the first eNB with a handover preparation failure message when substantially all mandatory bearers required by the application cannot be accepted at the second eNB. In specific embodiments, the handover request includes a list of substantially all mandatory bearers required by the application.