PUSCH Scheduling Without SRI for Uplink Beam Selection
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in resource allocation for uplink transmissions, particularly when using DCI format 0_1 for PUSCH scheduling without an SRI field, especially when there is only one SRS resource in the resource set.
Innovation Solution
The proposed solution involves determining whether DCI includes an SRI field and transmitting PUSCH transmissions based on this determination, utilizing a configured pathloss reference signal and dynamic power control mechanisms to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If DCI format 0_1 is used for PUSCH scheduling without an SRI field, then the DCI structure is simplified and overhead is reduced, but the UE cannot determine which beam to use for uplink transmission when multiple SRS resources are configured
Solution Approach 1:
The network pre-configures multiple SRS resources and their associated spatial relations before uplink transmission. When DCI format 0_1 schedules PUSCH without an SRI field, the UE can refer to these pre-configured resources and automatically select the appropriate beam based on the configured spatial relation information, eliminating the need for SRI indication while maintaining beam selection capability.
Solution Approach 2:
The UE autonomously determines the appropriate SRS resource and beam for PUSCH transmission by self-selecting from pre-configured resources. The UE uses the configured spatial relation information to identify the correct beam without requiring explicit SRI indication from the DCI, enabling self-service beam selection that simplifies DCI structure while maintaining transmission quality.
2Adaptability or versatility
If SRI field is included in DCI format 0_1, then the network can dynamically indicate the SRS resource for PUSCH beam reference, but the DCI overhead increases and resource allocation efficiency decreases
Solution Approach 1:
The SRI field is extracted from DCI format 0_1 when scheduling PUSCH transmission. The network configures multiple SRS resources with distinct spatial relations in advance, allowing the UE to autonomously select the appropriate resource without requiring dynamic SRI indication. This extraction eliminates unnecessary DCI overhead while maintaining the ability to support multiple beams through pre-configuration.
Solution Approach 2:
The pre-configured SRS resources serve multiple purposes: they provide beam reference for PUSCH transmission, enable spatial relation management, and support both codebook and non-codebook based PUSCH transmission modes. This multi-functionality eliminates the need for separate SRI indication, improving resource allocation efficiency while maintaining adaptability.
3Adaptability or versatility
If multiple SRS resources are configured for uplink transmission modes, then the system supports flexible beam management, but the UE experiences uncertainty about which beam to use when DCI does not contain SRI
Solution Approach 1:
The network performs preliminary configuration of multiple SRS resources with explicit spatial relation information before uplink transmission. Each configured SRS resource is associated with specific spatial parameters that the UE can reference. When DCI format 0_1 schedules PUSCH without SRI, the UE uses these pre-configured spatial relations to determine the appropriate beam, eliminating information loss while maintaining beam management flexibility.
4Device complexity
If only one SRS resource is configured, then the configuration is simple, but the system lacks flexibility for multi-beam operations and optimal resource utilization
Solution Approach 1:
The network pre-configures multiple SRS resources with distinct spatial relations in advance, creating a pool of available beams for uplink transmission. This preliminary configuration enables flexible beam selection without requiring complex real-time signaling. The UE can autonomously select from these pre-configured resources based on the scheduled PUSCH parameters, achieving multi-beam operation capability while keeping the configuration mechanism simple.
Data Source
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AI summary
In an aspect, the present disclosure includes a method, apparatus, and computer readable medium for wireless communications at a user equipment (UE) for receiving a downlink control indicator (DCI) from a network entity; and configuring at least one physical uplink shared channel (PUSCH) transmission based on a determination that the DCI does not include the scheduling request indicator (SRI) field.