Uplink Beam Selection Using Spatial Relation Filters
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Solution Overview
Problem
In the context of 5G uplink signal transmission, the ambiguity in beam indication by network devices to terminal equipment when PUCCH-Spatial-relation-info contains multiple items leads to uncertain uplink beam configuration, preventing effective uplink signal transmission.
Innovation Solution
The terminal equipment employs a spatial domain transmission filter associated with a predetermined or default item from the configured first information to transmit uplink signals when the network device's beam indication is ambiguous, ensuring transmission even without explicit beam configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network device configures multiple items in PUCCH-Spatial-relation-info but does not activate or indicate one of them via MAC CE, then the terminal equipment cannot determine which beam to use for transmission, but configuring only one item limits the flexibility of beam selection
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple spatial relation items in PUCCH-Spatial-relation-info through RRC signaling, preparing multiple beam options in advance. The terminal equipment can then select from these pre-configured items based on current channel conditions, achieving both flexibility and operational clarity without requiring MAC CE activation for each selection.
2Device complexity
If the network device does not configure PUCCH-Spatial-relation-info for the terminal equipment, then the configuration process is simpler, but the terminal equipment does not know which beam is used for transmission
Solution Approach 1:
The patent applies self-service by enabling the terminal equipment to autonomously determine the appropriate spatial relation item from the pre-configured PUCCH-Spatial-relation-info list based on current channel conditions and transmission requirements. This self-determination mechanism ensures reliable beam configuration without requiring continuous network device intervention or complex real-time configuration signaling.
3Reliability
If the network device activates or indicates one item via MAC CE to resolve beam ambiguity, then the beam indication becomes clear, but the signaling overhead and latency increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple spatial relation items through RRC signaling before transmission occurs. This allows the terminal equipment to immediately select from the pre-configured options without waiting for MAC CE activation, thereby resolving beam ambiguity while avoiding the signaling overhead and latency associated with real-time MAC CE signaling.
Data Source
AI summary
Uplink signal transmission method, uplink signal reception method and apparatus thereof and a system. The uplink signal transmission method includes: when a network device configures first information associated with a spatial relation for an uplink signal but the special relation for the uplink signal is not effective, a terminal equipment transmits an uplink signal by using a spatial domain transmission filter the same as that of a transmitted signal or a received signal or using a spatial domain transmission filter associated with a predetermined item in the first information. With this method, the terminal equipment may transmit an uplink signal by using a suitable spatial domain transmission filter in a case where an uplink beam is not determined according to the configuration of the network device.