Terminal Orthogonal Code Selection for Paging Access Latency
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Solution Overview
Problem
In wireless communication, terminals responding to paging often select the same orthogonal codes as each other or as terminals originating calls, leading to collisions and increased access latency due to the inability to prevent coincidental code selection.
Innovation Solution
A method and system where terminals responding to paging determine and use unique orthogonal codes based on predetermined rules, such as location within the paging message packet and system time, ensuring these codes differ from those used by other terminals responding to paging or originating calls, thereby avoiding conflicts and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If terminals respond to paging using random access with uniformly selected orthogonal codes, then the access procedure is simple and flexible, but collisions occur when multiple terminals select the same orthogonal code leading to increased access latency
Solution Approach 1:
The patent changes the selection parameter from uniform random selection to deterministic selection based on terminal identity and paging message location. This ensures that each terminal responding to paging selects a unique orthogonal code, eliminating collisions while maintaining procedural simplicity.
Solution Approach 2:
The system enables terminals to autonomously determine their orthogonal code based on their own identity information and the paging message characteristics, without requiring centralized allocation or complex coordination, thus reducing access latency while maintaining simplicity.
2Device complexity
If terminals use the same orthogonal code for random access, then the code selection process is straightforward, but signal interference occurs making it impossible for the receiver to extract useful information
Solution Approach 1:
The patent transforms the code selection from a random process to a deterministic one based on terminal identity and paging message parameters. This ensures orthogonal codes are uniquely assigned to each terminal responding to paging, eliminating signal interference while keeping the selection process simple.
3Ease of manufacture
If orthogonal codes are uniformly distributed for all access types, then the code allocation is simple and fair, but conflicts occur between paging response terminals and call originator terminals
Solution Approach 1:
The patent applies different code selection strategies to different access types. For paging response, terminals use codes determined by their identity and paging message location. For call origination, terminals use a different uniform selection method. This local differentiation eliminates conflicts between the two access types while maintaining overall system simplicity.
Data Source
AI summary
A system and method for terminal access includes transmitting a paging message from a network to a terminal; determining, by the terminal, orthogonal code information which differs from the one being used for current system access according to a predetermined rule; acquiring by the terminal a corresponding orthogonal code according to the orthogonal code information and modulating an access probe according to the orthogonal code; and transmitting the access probe by the terminal to the network and performing network access. In the various embodiments, the terminal responding to the paging selects a unique access orthogonal code according to the method and system. According to various embodiments, conflicts are minimized as a result of using the same orthogonal code between the terminals responding to the paging and between the terminal responding to the paging and the terminal originating the call. Accordingly, latency in the response to paging may be reduced.