Sidelink Positioning Session ID Management for Collision-Free Sessions
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Solution Overview
Problem
Conventional sidelink (SL) positioning methods fail to effectively manage session IDs in terminal-to-terminal communication outside the coverage of a cellular network, leading to collisions and conflicts in SL positioning sessions.
Innovation Solution
A method for generating and managing session IDs in SL positioning sessions by using unique identifiers associated with the initiator node's information and distinctive session initialization details, along with collision detection and resolution mechanisms to ensure session ID uniqueness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional SL positioning methods are used outside cellular network coverage, then terminal devices can perform positioning interactions, but session ID collisions and conflicts occur leading to ineffective session management
Solution Approach 1:
The patent applies preliminary action by having the initiator node pre-generate and allocate unique session IDs to receiver nodes before positioning sessions are established. This proactive assignment prevents session ID collisions from occurring in the first place, rather than detecting and resolving them after conflicts arise. The initiator node maintains a mapping relationship between receiver nodes and session IDs, ensuring uniqueness across multiple positioning sessions.
Solution Approach 2:
The patent implements feedback mechanisms where receiver nodes send SLPP messages containing session ID information back to the initiator node. This feedback loop allows the initiator to track and manage session IDs associated with different receiver nodes, enabling it to detect potential collisions and allocate new unique session IDs when necessary. The feedback ensures continuous session management reliability in dynamic sidelink environments.
2Productivity
If session IDs are reused across multiple positioning sessions, then resource utilization improves, but session differentiation becomes difficult causing conflicts
Solution Approach 1:
The patent applies segmentation by dividing the session ID management into distinct segments: each receiver node is assigned a dedicated session ID segment by the initiator node. The session ID space is partitioned based on receiver node identities, ensuring that session IDs are uniquely associated with specific receiver nodes. This segmentation allows efficient resource utilization while maintaining clear session differentiation, as each segment remains manageable and traceable to its corresponding receiver node.
Data Source
AI summary
Provided are a method for receiving and generating a session identifier (ID) of a sidelink (SL) positioning session, and a terminal device. The method for receiving a session ID of an SL positioning session is performed by a receiver node and the method includes: receiving a first SL positioning protocol (SLPP) message, wherein the first SLPP message carries a first session ID; and transmitting a first message in a case where the first session ID is identical to any stored session ID, wherein the first message is used to request or direct a change to the first session ID; wherein the first session ID is used to identify a first positioning session to which the first SLPP message belongs.