Sidelink Positioning Protocol Modes for V2X Accuracy
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Solution Overview
Problem
Current wireless communication systems lack formalized procedures for sidelink positioning between User Equipments (UEs), limiting the effectiveness of sidelink-based positioning methods in applications like V2X communication and Public Safety scenarios.
Innovation Solution
The implementation of a sidelink positioning protocol (SLPP) that enables UEs to determine sessions and exchange messages for sidelink positioning, either in session mode or sessionless mode, using SL PRS, WiFi, UWB, and GNSS signals, facilitating pairwise or group operations, and network-supported positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional UE-based positioning and UE-assisted positioning are used, then positioning can be performed in cellular networks, but positioning effectiveness is limited in sidelink applications like V2X and Public Safety scenarios
Solution Approach 1:
The patent segments positioning operations into distinct modes: session-based positioning for discovery scenarios and sessionless positioning for non-discovery scenarios. This segmentation allows the system to adapt to different sidelink application requirements, improving both reliability and versatility in various positioning contexts.
Solution Approach 2:
The patent implements dynamic positioning approaches where UEs can transition between session-based and sessionless modes depending on discovery status and application requirements. This dynamic adaptability enables effective positioning across diverse sidelink scenarios including V2X and Public Safety communications.
2Measurement precision
If session-based SLPP messaging is implemented, then positioning accuracy is improved through formalized procedures, but system complexity increases due to session management requirements
Solution Approach 1:
The patent divides positioning procedures into session-based and sessionless segments. Session-based positioning provides formalized procedures for high-accuracy requirements, while sessionless positioning offers simplified procedures for other scenarios. This segmentation resolves the contradiction by providing high precision only where needed.
Solution Approach 2:
The system changes operational parameters dynamically by selecting between session-based and sessionless modes based on discovery status and positioning requirements. This parameter change allows the system to achieve high measurement precision when necessary while reducing complexity when appropriate.
3Ease of operation
If sessionless SLPP messaging is used, then procedure simplicity is improved by eliminating discovery requirements, but positioning capability is reduced for scenarios requiring UE discovery
Solution Approach 1:
The patent segments positioning into two distinct operational modes: session-based mode for scenarios requiring discovery and sessionless mode for scenarios without discovery requirements. This segmentation allows each mode to be optimized for its specific use case, maintaining procedure simplicity where applicable while preserving discovery capability where needed.
Solution Approach 2:
The system dynamically selects between session-based and sessionless positioning modes based on whether UE discovery is required. This dynamic adaptation ensures procedure simplicity is achieved when discovery is not needed, while maintaining full discovery capability when it is required.
4Adaptability or versatility
If multiple positioning techniques (RTK, AOA, RTT) are supported, then positioning versatility is improved, but system complexity increases due to multiple measurement methods
Solution Approach 1:
The patent implements a universal SLPP framework that can accommodate multiple positioning techniques (RTK, AOA, RTT) through a common message exchange structure. This multi-functionality allows the system to support diverse positioning methods without proportionally increasing complexity, as the underlying protocol architecture remains consistent across different measurement techniques.
Data Source
AI summary
Sidelink positioning of a plurality of UEs may be performed using a sidelink (SL) positioning protocol (SLPP) in either a session mode or a sessionless mode. In the session mode, one UE in the plurality of UEs may discover the other UEs, determine a session for SLPP, indicate the session to the other UEs, and exchange a plurality of SLPP messages with the other UEs, where the SLPP messages are part of the session and enable the sidelink positioning. In the sessionless mode, a UE may not discover some or all other UEs in the plurality of UEs and may exchange a plurality of SLPP messages with the other UEs, where the SLPP messages are not part of a session but enable the sidelink positioning. The two modes may each apply to SL positioning using SL PRS signals as well as WiFi, UWB and GNSS signals.