Dormant SCG Beam Correspondence for Low-Latency Uplink Signaling
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Solution Overview
Problem
In wireless communication systems, particularly in the context of 5G New Radio (NR), there is a challenge in effectively managing beam correspondence between downlink and uplink transmit beams for secondary cell groups (SCGs) when they are in a dormant state, which affects signal transmission efficiency and latency.
Innovation Solution
The method involves determining uplink transmit beams for a primary secondary cell (PSCell) of the SCG based on spatial relation indications (SRIs) or default uplink beams, and transmitting signals on these determined beams while the SCG is in a dormant state, thereby establishing beam correspondence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam management is performed for SCG in dormant state, then signal transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent extracts beam management functionality specifically for dormant SCG from the overall cell group management, allowing independent beam determination and measurement for dormant cells. This enables targeted beam management that improves signal transmission efficiency without requiring full beam management for all cell groups, thus limiting the increase in device complexity to only what is necessary for dormant SCG beam operations.
Solution Approach 2:
The patent segments beam management operations by distinguishing between dormant and non-dormant SCG states. Different beam management procedures are applied: for dormant SCG, beam determination is based on spatial relation indications from downlink beams or default uplink beams, while non-dormant SCG uses full beam management. This segmentation allows efficient beam management for dormant cells without unnecessarily complicating the overall system.
2Loss of time
If beam alignment is ensured in dormant state, then latency is reduced, but use of energy increases
Solution Approach 1:
The patent applies partial beam management action for dormant SCG by determining uplink transmit beams based on spatial relation indications from downlink beams or using default uplink beams, rather than performing complete beam sweeping and measurement. This partial action reduces latency for beam alignment while consuming less energy compared to full beam management, as the UE only performs necessary beam determination and measurements for dormant cells.
Solution Approach 2:
The patent performs preliminary beam determination for dormant SCG by establishing spatial relations between downlink transmit beams and uplink transmit beams in advance. When the SCG transitions from dormant to non-dormant state, the beam alignment is already established, reducing activation latency. This preliminary beam setup consumes minimal energy compared to performing full beam management during active operation.
Data Source
AI summary
In an aspect, a UE receives, while a secondary cell group (SCG) is associated with a dormant state, at least one downlink transmit beam associated with at least one cell of the SCG. The UE determines, while the SCG is associated with the dormant state, an uplink transmit beam for a primary secondary cell (PSCell) of the SCG based on one or more of a spatial relation indication (SRI), whether there is beam correspondence between the at least one downlink transmit beam and the uplink transmit beam, a default uplink transmit beam, or a combination thereof. The UE transmits a signal related to a measurement between the UE and the one or more SCells of the SCG on the determined uplink transmit beam.