name: PRS
full_form: Positioning Reference Signal
context: With the new PRS patterns, backwards compatibility needs to be ensured, that is, legacy UEs can still operate on the legacy PRS patterns. If, instead, the eNB replaces the existing PRS with a new PRS pattern, legacy UE is not able to utilize the PRS sent from such eNB. To keep backward compatibility, the PRS enhancement should be additions to the existing PRS, such that legacy UEs can carry out positioning based on legacy pattern and new UEs can achieve better positioning performance based on enhanced PRS pattern. The enhanced PRS may include the legacy PRS as a component. The new PRS pattern can be added in time domain, where the new PRS spans additional subframes. Coexistence of legacy and new PRS can be realized by putting them in the adjacent subframes so that they constitute a continuous, expanded PRS occasion. The proposed addition of new PRS is transparent to legacy UEs, whereas the enhanced UEs are able to make use of both legacy and new PRS in the expanded occasion. The
description: The Positioning Reference Signal (PRS) is used for positioning in wireless communication systems. User equipment (UE) uses it to determine their location. PRS enhancement aims to improve positioning performance while maintaining backward compatibility with legacy UEs, allowing them to continue using existing PRS patterns.
explanation: The text describes the PRS as a signal specifically designed for positioning purposes in wireless communication systems. Its function is to help user equipment determine its location, making it a type of Signal.
section_title: 7.1.1.1.6	PRS Backward capability (method 2)
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