EVDO Access Network Connection Setup Collision Resolution
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Solution Overview
Problem
In mobile terminated calls, the existing connection setup procedure for EVDO evolution systems faces collisions during access attempts due to multiple access terminals using the same access sequence, leading to inefficiencies and increased connection setup times.
Innovation Solution
A new connection setup mechanism where the Access Network reserves and sends a unique access sequence with the page message, allowing access terminals to use this reserved sequence for access attempts, eliminating the need for Bind Request/Response messages and optimizing the access probe detection process by treating the access probe as a ConnectionOpenRequest message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If multiple access terminals use the same access sequence to send access probes simultaneously, then the access probe detection threshold at AN is reduced, but collision occurs during access attempt
Solution Approach 1:
The Access Network pre-allocates and includes a unique access sequence in the page message before the access terminal sends the access probe. This preliminary assignment of a dedicated access sequence to each paged terminal eliminates the need for random selection and prevents multiple terminals from using the same sequence, thereby resolving the collision issue while maintaining efficient detection.
2Reliability
If Bind Request/Response mechanism is used to resolve access collisions, then collision during access attempt is resolved, but connection setup time increases
Solution Approach 1:
The page message includes the access sequence and MAC ID in advance, so when the access terminal sends the access probe with this pre-assigned sequence, the Access Network already has the necessary information to identify and acknowledge the terminal. This eliminates the need for subsequent Bind Request/Response exchange, as the association is already established through the pre-included sequence and MAC ID pairing.
Solution Approach 2:
The patent extracts the access sequence and MAC ID assignment from the post-access-probe Bind Request/Response phase and moves it to the pre-access page message. By taking out these critical identification elements and placing them in advance, the system eliminates the time-consuming Bind Request/Response exchange while maintaining collision resolution capability.
3Ease of operation
If access sequence is selected randomly from available sequences, then access terminal can autonomously select sequence, but collision probability increases
Solution Approach 1:
Instead of requiring the access terminal to randomly select an access sequence autonomously, the Access Network performs the sequence assignment in advance by including a unique access sequence in the page message. This preliminary assignment eliminates the random selection process and ensures that each paged terminal receives a dedicated sequence, thereby reducing collision probability while simplifying the terminal's role to merely transmitting the pre-assigned sequence.
Data Source
AI summary
The invention relates to telecommunication systems and in particular to a method and system for efficient connection setup procedure for mobile terminated calls. A method of connection setup for mobile terminated calls is proposed in which a page message originating from the access network contains one access sequence along with access terminal identity or unicast access terminal identifier (UATI) of the paged access terminal. When more than one access terminal uses the same access sequence for sending their access probe at the same time a collision may occur. Access network selects access sequences from a reserved pool to direct the paged access terminal for performing access attempt to avoid collisions during access attempts. With this resource pooling, there is no need to send bind request and hence connection setup time reduces.