NR TA Offset Signaling for TDD LTE Coexistence Timing
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Solution Overview
Problem
In existing wireless communication systems, the timing advance (TA) offset in New Radio (NR) networks is not adequately adjusted for time division duplex (TDD) scenarios, leading to inefficient guard periods and increased interference due to unknown LTE-NR coexistence, which affects uplink and downlink timing alignment.
Innovation Solution
The method involves determining the TA offset based on network type, carrier frequency, and LTE coexistence, with explicit signaling to the UE for optimal TA offset values, minimizing guard periods and enhancing capacity by adapting to specific deployment scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed NTA offset is used in TDD networks, then timing alignment is simplified, but guard periods become inefficient and interference increases due to unknown LTE-NR coexistence
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed NTA offset to a dynamic, adaptable offset mechanism. The base station determines the appropriate NTA offset based on whether LTE and NR networks coexist, and this offset is then signaled to UEs. This allows the system to adapt timing parameters to actual deployment scenarios, optimizing guard period efficiency and reducing interference while maintaining manageable complexity through centralized control.
2Measurement precision
If explicit TA offset signaling is implemented, then timing alignment accuracy improves, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by providing targeted, scenario-specific NTA offset values rather than universal signaling. The base station determines the offset based on local conditions (LTE-NR coexistence status) and signals only the necessary information to UEs. This approach achieves high timing alignment accuracy for each specific deployment scenario while minimizing signaling overhead by avoiding redundant or overly detailed information transmission.
Data Source
AI summary
A method performed by a wireless device for determining a timing advance (TA) offset in a new radio (NR) network is described herein along with associated network devices and systems. An exemplary method includes obtaining an indication of whether a carrier frequency of the NR network coexists with a carrier frequency of a long term evolution (LTE) network, determining, based on whether the carrier frequency of the NR network coexists with carrier frequency of the LTE network, a TA offset for uplink transmission; and transmitting an uplink transmission using the determined TA offset.