User Equipment TAI Construction for Satellite Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mobile communication systems face challenges in handling multiple tracking area identifiers (TAIs) in satellite access, particularly in defining rules for TAI construction during attach or tracking area update procedures and managing forbidden lists when a subset of broadcast TACs is forbidden.
Innovation Solution
A method and apparatus where a processor in a user equipment (UE) initiates procedures with a satellite-accessing cell, constructs a TAI or a list of TAIs based on the cell's support for multiple TACs per public land mobile network (PLMN), and handles reject or accept messages to manage forbidden lists accordingly, allowing for registration, tracking area updates, and service requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cell broadcasts multiple TACs per PLMN to improve coverage and service availability in satellite access, then the adaptability and versatility of the system is improved, but the device complexity and difficulty of managing TAIs increases
Solution Approach 1:
The patent segments the TAI construction process into distinct cases: when a single TAC is broadcast versus when multiple TACs are broadcast. For single TAC, the UE constructs a single TAI; for multiple TACs, the UE constructs a list of TAIs. This segmentation simplifies the overall complexity by providing clear, separate handling rules for different scenarios.
Solution Approach 2:
The patent changes the parameter of TAI structure from a single identifier to a list of identifiers based on the number of TACs broadcast by the cell. This parameter change allows the system to adapt to satellite access requirements (multiple TACs) while maintaining a consistent construction methodology - the UE simply follows the same logic of reading broadcast TACs and constructing corresponding TAIs, whether one or many.
2Measurement precision
If the UE constructs a list of TAIs when multiple TACs are broadcast to improve tracking accuracy, then the measurement precision is improved, but the loss of time and processing overhead increases
Solution Approach 1:
The patent applies preliminary action by having the UE construct the TAI or TAI list during the initial attach procedure or when reading system information, before actual tracking area updates are needed. This preliminary construction eliminates the need for time-consuming processing during critical tracking events, as the UE already has the appropriate TAI(s) ready for use.
Solution Approach 2:
The UE autonomously determines whether to construct a single TAI or a list of TAIs based on the number of TACs it reads from the cell broadcast. This self-service approach eliminates the need for additional network signaling or complex coordination, allowing the UE to efficiently construct the appropriate TAI structure independently and quickly.
3Reliability
If the system implements comprehensive rules for handling forbidden lists with multiple TAIs to improve reliability, then the reliability is improved, but the device complexity and ease of operation deteriorates
Solution Approach 1:
Instead of having the network provide complex forbidden list management rules for multiple TAIs, the patent inverts the approach by having the UE autonomously apply consistent forbidden list handling rules regardless of whether one or multiple TAIs are constructed. The UE simply checks each TAI against the forbidden list independently, which simplifies the operation while maintaining reliability through comprehensive coverage of all TAIs.
Data Source
AI summary
Examples pertaining to handling of multiple tracking area identifiers (TAIs) in satellite access in mobile communications are described. A user equipment (UE) initiates a procedure with a satellite-accessing cell of a network. The UE constructs a TAI or a plurality of TAIs, as a list of TAIs, of the cell depending on whether the broadcasts one or more than one tracking area codes (TACs) per public land mobile network (PLMN). The UE receives either a reject message or an accept message from the network responsive to initiating the procedure.