SSB-Based Beam Selection for NCR Access Link Forwarding
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Solution Overview
Problem
In wireless communication systems, determining the beam direction for the access link between a user equipment (UE) and a network-controlled repeater (NCR-Fwd) is challenging, leading to excessive signaling overhead when the base station explicitly indicates the beam direction.
Innovation Solution
A method where a device operates in a wireless communication system by receiving synchronization signal/physical broadcast channel block (SSB) configuration information and performs forwarding operations based on specific SSB indexes, using beam identity (ID) or transmission configuration indicator (TCI) states to determine the beam direction for the access link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station explicitly indicates the beam direction of the access link, then the beam direction can be accurately determined, but the signaling overhead increases excessively
Solution Approach 1:
The patent uses SSB configuration information as an intermediary to indirectly indicate beam direction. Instead of explicitly signaling beam direction, the base station configures SSB parameters (time resources, frequency resources, SSB indexes) that the network-controlled repeater uses to autonomously determine the appropriate beam direction for forwarding operations.
Solution Approach 2:
The network-controlled repeater autonomously determines the beam direction for the access link by using the configured SSB parameters. The repeater performs self-service by selecting beams based on SSB transmission patterns without requiring explicit beam direction commands from the base station, thereby reducing signaling overhead.
2Area of stationary object
If the network-controlled repeater performs forwarding operations in all time resources, then the coverage is maximized, but the interference with direct base station reception by UE increases
Solution Approach 1:
The patent segments the forwarding operation to occur only in specific time resources where SSB with particular indexes are transmitted. By dividing the time resources and associating each SSB index with specific forwarding opportunities, the system allows UEs to directly receive SSB in certain time slots while the repeater forwards in others, reducing interference.
Solution Approach 2:
The forwarding operation is performed periodically based on SSB transmission patterns. The network-controlled repeater forwards signals in time resources corresponding to specific SSB indexes and refrains from forwarding in other time resources, creating a periodic pattern that avoids continuous interference with direct UE reception.
Data Source
AI summary
Provided are an operation method of a device in a wireless communication system, and a device using the method. In the method, the device receives SSB configuration information from a network, and performs a forwarding operation on the basis of the SSB configuration information. The device performs a forwarding operation only in a time resource through which a SSB corresponding to a specific SSB index among SSB indexes indicated by the SSB configuration information is transmitted. The SSB configuration information indicates a beam ID or TCI state associated with each SSB index. The device may perform a forwarding operation of an access link, by using a beam determined on the basis of the beam ID or TCI state associated with the specific SSB index, in a time resource through which an SSB having a specific SSB index is transmitted.