Uncontrolled Handover via Temporary STID Allocation
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Solution Overview
Problem
Current wireless access systems face challenges in performing efficient and reliable handovers, especially during uncontrolled handovers, where location privacy of mobile stations (MS) is compromised due to prolonged ranging procedures and lack of secure identifier allocation.
Innovation Solution
The method involves transmitting a ranging request message to a target Base Station (BS) with a serving BS ID and a temporary Station ID (STID) for network reentry, receiving valid security information and a second STID for identification, and performing handover operations, including transmitting a handover indication message and ranging code to ensure secure and efficient uncontrolled handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile station performs uncontrolled handover to a target base station not recommended by the serving base station, then the mobile station can maintain communication continuity, but the location privacy of the mobile station is compromised due to prolonged ranging procedures
Solution Approach 1:
The mobile station performs preliminary synchronization and timing adjustment with the target base station before completing the handover process. This preliminary action reduces the duration of the ranging procedure by pre-establishing timing relationships, thus maintaining communication continuity while minimizing location privacy exposure time.
2Device complexity
If a mobile station performs uncontrolled handover without proper identifier allocation, then the handover process is simplified, but security is compromised due to lack of secure identifier allocation
Solution Approach 1:
A temporary identifier is introduced as an intermediary element during the uncontrolled handover process. This temporary identifier enables secure communication between the mobile station and target base station without requiring complex identifier allocation procedures, thus maintaining security while keeping the handover procedure relatively simple.
3Ease of operation
If a mobile station transmits ranging request message with serving BS ID during uncontrolled handover, then the target base station can perform network reentry, but location privacy is compromised
Solution Approach 1:
The critical identifying information (serving BS ID) is extracted and transmitted separately from the main ranging request message. This extraction allows the target base station to perform network reentry while minimizing the exposure of location privacy information in the primary communication channel.
4Loss of information
If a mobile station performs controlled handover with serving base station coordination, then location privacy is protected, but handover reliability is reduced when target base station is not in recommended list
Solution Approach 1:
The handover mechanism dynamically adapts between controlled and uncontrolled modes based on the target base station's presence in the recommended list. When the target is not recommended, the system transitions to uncontrolled handover with enhanced privacy protection measures, thus maintaining handover success while protecting location privacy.
Data Source
AI summary
A device, system and method for performing an uncontrolled handover in a mobile station, a ranging request message including an identifier of a serving base station and a first identifier used in the serving base station is transmitted to a first target base station to perform network (re)entry to the first target base station, and a ranging response message including security information and a second identifier for identifying the mobile station is received from the first target base station.