Orthogonal RACH Preamble Segmentation for 5G Positioning
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Solution Overview
Problem
Current wireless communication systems, particularly in the transition to 5G, face challenges in efficiently managing random access channels (RACH) preambles for both positioning and communication purposes, leading to suboptimal spectral efficiency and increased latency.
Innovation Solution
The method involves determining and transmitting specific RACH preambles associated with transmission-reception points (TRPs) to indicate positioning sessions, allocating resources for uplink positioning signals, and transmitting these signals, thereby optimizing the use of RACH preambles for both positioning and communication tasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RACH preambles are used for both positioning and communication purposes, then device complexity is reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent segments RACH preambles into two distinct sets: a first set dedicated to positioning purposes and a second set dedicated to communication purposes. This segmentation allows the system to maintain simplified preamble management while improving spectral efficiency by ensuring that positioning preambles are not inadvertently used for communication and vice versa, thereby resolving the contradiction between device complexity and spectral efficiency.
2Productivity
If RACH preambles are dedicatedly managed for positioning sessions, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements a unified RACH procedure that handles both positioning and communication purposes through a single framework. The gNodeB performs similar processing operations for both preamble types, and the UE follows a consistent procedure for initiating both positioning sessions and communication connections. This multi-functionality approach improves spectral efficiency through dedicated preamble management while avoiding the complexity increase that would result from implementing separate independent systems.
3Productivity
If separate RACH preambles are used for positioning and communication, then spectral efficiency is improved, but latency increases
Solution Approach 1:
The patent merges the initialization procedures for positioning sessions and communication connections into a single RACH-based process. Both types of sessions can be initiated using the same random access procedure, with the gNodeB identifying the session type based on the preamble set used. This merging approach maintains spectral efficiency through dedicated preambles while reducing latency by eliminating the need for separate initialization procedures and enabling parallel processing of positioning and communication setup.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) determines at least one random access channel (RACH) preamble from a first set of RACH preambles, wherein the first set of RACH preambles is for positioning purposes and a second set of RACH preambles is for communication purposes, and wherein the first set of RACH preambles and the second set of RACH preambles are associated with at least one transmission-reception point (TRP), transmits, to the at least one TRP, the at least one RACH preamble to indicate that the UE is involved in a positioning session, receives, from the at least one TRP, in response to transmitting the at least one RACH preamble, an allocation of one or more resources for transmission of uplink positioning signals for the positioning session, and transmits the uplink positioning signals via the one or more resources.