Repeater Detection via SSB Periodicity Deviation
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Solution Overview
Problem
In wireless communications systems, the presence of a repeater device is often not detected by user equipment (UE) and network entities, leading to inefficiencies in beam management and resource allocation.
Innovation Solution
A method and apparatus for a UE to detect the presence of a repeater by determining the periodicity of synchronization signal blocks (SSBs) redirected by the repeater, which differs from the configured SSB periodicity, and to transmit a measurement report indicating the presence of the repeater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE monitors all SSB transmissions with configured periodicity, then measurement accuracy is improved, but detection of repeater presence deteriorates due to inability to identify periodicity changes
Solution Approach 1:
The UE measures SSB periodicity and compares it against the configured periodicity to detect repeater presence. This feedback mechanism allows the system to identify when a repeater is present by detecting deviations from the expected SSB transmission pattern, thereby resolving the contradiction between maintaining measurement accuracy and detecting repeater presence.
Solution Approach 2:
The SSB periodicity acts as an intermediary indicator that reveals the presence of a repeater. Instead of directly detecting the repeater, the system uses the periodicity of SSB transmissions as a mediator to infer repeater presence, enabling detection without compromising measurement accuracy.
2Stability of the object's composition
If the network entity maintains current SSB transmission periodicity, then system stability is improved, but connection establishment speed deteriorates when repeaters are present
Solution Approach 1:
The network entity dynamically adjusts SSB transmission periodicity based on detected repeater presence. When a repeater is detected, the system transitions from a static configured periodicity to a dynamic adjusted periodicity that accounts for the repeater's impact on signal transmission, thereby reducing connection establishment time while maintaining overall system stability.
Solution Approach 2:
The system changes the SSB transmission periodicity parameter in response to repeater detection. By modifying this key parameter, the network entity optimizes connection establishment speed in repeater environments without fundamentally altering the stable architecture of the communication system.
3Area of stationary object
If the repeater redirects SSBs in multiple directions, then coverage area is improved, but SSB periodicity detection becomes complex
Solution Approach 1:
The UE performs self-service by autonomously measuring and determining the periodicity of received SSBs without requiring complex network assistance. This self-determined periodicity measurement simplifies the overall detection process while maintaining the ability to detect repeater presence even when SSBs are redirected in multiple directions for expanded coverage.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a network entity, control signaling indicating a periodicity of synchronization signal block (SSB) transmissions. The UE may receive a set of SSBs including at least a first SSB from a repeater. The repeater may retransmit the set of SSBs from the network entity. The UE may transmit a measurement report for the first SSB to the network entity indicating a presence of the repeater based on the periodicity of SSB transmissions and a periodicity of the first SSB.