Candidate Resource Group Signaling for Uplink SRS Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face significant signaling overhead when indicating SRS resources for uplink data transmissions, especially with advanced technologies supporting multiple antenna ports, leading to inefficient downlink control signaling.
Innovation Solution
The base station configures and signals candidate resource groups or resources to reduce the number of states needed for indicating SRS resources, using techniques such as predetermined candidate groups, bitmaps, and rules to limit resource identification, thereby minimizing the signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system supports multiple antenna ports for uplink data transmissions, then the transmission capability and spectral efficiency are improved, but the signaling overhead for indicating SRS resources increases significantly
Solution Approach 1:
The patent segments the SRS resource indication into two parts: a first indicator field in DCI that points to a candidate resource group, and a second indicator field that selects the specific SRS resource within that group. This segmentation reduces the immediate signaling overhead in downlink control while maintaining the ability to indicate multiple antenna ports for uplink transmission.
Solution Approach 2:
The patent performs preliminary configuration of candidate SRS resource groups via higher layer signaling (RRC) before actual uplink transmission. By pre-defining groups of SRS resources and their associated antenna ports, the system reduces the real-time signaling burden during data transmission while still supporting multiple antenna ports.
2Adaptability or versatility
If the number of SRS resources to be indicated increases to support more antenna ports, then the uplink transmission flexibility is improved, but the number of bits required for downlink control messages increases
Solution Approach 1:
The indication of SRS resources is segmented into a group-level indicator and a resource-level indicator. The first indicator field (group indicator) selects from a limited set of candidate groups, while the second indicator field (resource indicator) selects within the group. This reduces the bit requirement in the critical downlink control message while maintaining flexibility through the two-stage indication.
Solution Approach 2:
The system performs preliminary grouping of SRS resources by antenna ports through higher layer configuration. This pre-organization allows the downlink control message to reference pre-defined groups rather than individually specifying each resource, reducing message size while preserving the ability to indicate multiple antenna ports through the group structure.
3Adaptability or versatility
If all SRS resources are configured for potential use, then the system adaptability is improved, but the signaling overhead for resource indication increases
Solution Approach 1:
The patent segments the configured SRS resources into multiple candidate groups, where each group is associated with specific antenna ports. The downlink control message only needs to indicate which group to use rather than specifying individual resources from the entire configured set, reducing signaling overhead while maintaining adaptability through the group structure.
Solution Approach 2:
The system performs preliminary organization of all configured SRS resources into candidate groups through higher layer signaling. This pre-grouping allows the system to maintain adaptability across all configured resources while reducing the indication overhead during actual transmission by referencing pre-defined groups rather than individual resources.
Data Source
AI summary
Methods, systems, and devices related to reducing signaling overhead for uplink transmissions are described. In one representative aspect, a method for wireless communication includes transmitting, from the wireless communication node, a first message to a mobile device. The first message identifies one or more resource groups that correspond to a transmission rank to be used by the mobile device for a data transmission from the mobile device to the wireless communication node. The one or more resource groups are selected from a set of candidate resource groups or a set of candidate resources. The method also includes receiving, at the wireless communication node, the data transmission having the transmission rank from the mobile device.