Configured Grant Transmission SSB-PUSCH Mapping
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Solution Overview
Problem
Current 5G communication systems face inefficiencies in supporting infrequent small data transmissions in the RRC_INACTIVE state, leading to unnecessary power consumption and signaling overhead due to the lack of effective beam alignment between User Equipments (UEs) and gNBs in Configured Grant (CG) based transmission.
Innovation Solution
Establishing periodic mappings between Synchronization Signal Blocks (SSBs) and Physical Uplink Shared Channel (PUSCH) resources, referred to as association periods, to facilitate beam alignment and improve transmission efficiency for CG based transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If CG based transmission is used in RRC_INACTIVE state, then signaling overhead and power consumption are reduced, but beam alignment cannot be achieved
Solution Approach 1:
The network pre-configures multiple PUSCH resources with different SSB associations before the UE needs to transmit. When the UE has data to send, it can directly use the pre-configured PUSCH resource associated with the selected SSB, eliminating the need for RACH procedure while maintaining beam alignment capability.
Solution Approach 2:
The patent introduces dynamic association between SSB and PUSCH resources through the association period mechanism. The UE can dynamically select which PUSCH resource to use based on which SSB it detects as the best beam, while the network can dynamically update the associations through RRC reconfiguration.
2Productivity
If RACH procedure is skipped for CG based SDT, then transmission efficiency is improved, but the gNB cannot know which SSB beam is good for the UE
Solution Approach 1:
The UE provides feedback to the network by indicating which SSB it selected for CG-based transmission. This can be done through SSB index indication in the uplink transmission or through implicit feedback where the network infers the selected SSB based on which PUSCH resource the UE uses. This feedback mechanism allows the network to know the UE's beam selection without requiring a full RACH procedure.
3Reliability
If connection is set up for each data transmission, then reliable communication is ensured, but signaling overhead increases and battery life decreases
Solution Approach 1:
The network performs preliminary configuration of CG resources and SSB associations when the UE transitions to RRC_INACTIVE state. This pre-configuration includes setting up multiple PUSCH resources with different periodicities and SSB associations, so the UE is ready to transmit immediately without needing to re-establish the connection.
Solution Approach 2:
The UE autonomously selects the appropriate PUSCH resource based on its detected best SSB and transmission requirements, without needing network scheduling. The UE independently manages its uplink transmissions in RRC_INACTIVE state using the pre-configured resources, reducing the need for network control signaling.
Data Source
AI summary
Embodiments of the present disclosure provide methods, apparatus, and computer program products for configured grant (CG)-based transmission. A method comprises: determining one or more synchronization signal and physical broadcast channel blocks (SSBs); determining one or more physical uplink shared channel (PUSCH) resources mapped to the determined one or more SSBs in an association period, according to mapping information on mappings between a set of SSBs and a set of PUSCH resources; and transmitting to a network node, data of the CG based transmission by utilizing the determined one or more PUSCH resources. The association period is a time period in which all SSBs in the set of SSBs are mapped at least once to respective PUSCH resources.