NR-U Uplink Resource Block Sets via DCI REG Indexing
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Solution Overview
Problem
Existing DCI formats in wireless communication systems, such as DCI format 0_0, do not include explicit resource block set allocations for physical uplink shared channel (PUSCH) communications, necessitating a solution for determining resource block sets for uplink transmissions.
Innovation Solution
UEs determine resource block sets based on the starting or ending resource element groups of the DCI, or a combination thereof, and BSs allocate multiple resource block sets to enhance uplink bandwidth and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If DCI format 0_0 is used for scheduling PUSCH communications, then the DCI structure is simplified and overhead is reduced, but the resource block set allocation information is missing and cannot be directly determined
Solution Approach 1:
The patent introduces an intermediary mechanism where the resource block set is determined through the relationship between the DCI's resource element group (REG) indexing and the configured resource block sets. Specifically, the first REG index in the DCI serves as an intermediary pointer to identify which resource block set should be used for PUSCH transmission, thereby resolving the information loss without adding explicit allocation fields to the DCI.
Solution Approach 2:
The system employs self-service by allowing the DCI structure itself to carry implicit information about the resource block set through its own parameters (REG indexing and mapping). The UE uses the DCI's inherent structure to determine the resource block set, making the system self-sufficient without requiring additional signaling from the network side.
2Measurement precision
If explicit resource block set allocation is added to DCI format, then the resource block set information is complete and accurate, but the DCI size increases and scheduling overhead is increased
Solution Approach 1:
The patent extracts the resource block set identification function from the DCI's explicit allocation fields and relocates it to the REG indexing mechanism. By taking out the need for explicit resource block set bits and using the existing REG index to imply the resource block set selection, the solution maintains accuracy while reducing DCI complexity.
3Ease of operation
If a single resource block set is used for uplink transmission, then the transmission is simple and controlled, but the uplink bandwidth is limited and interference is increased
Solution Approach 1:
The patent segments the uplink transmission across multiple resource block sets instead of using a single contiguous block. The UE transmits PUSCH using multiple resource block sets that are determined based on the DCI's REG indexing, thereby increasing the effective uplink bandwidth and reducing interference while maintaining controlled transmission through systematic segmentation of the frequency resources.
Data Source
AI summary
Wireless communications systems and methods related to resource block set allocation for dynamic uplink communications in a wireless communication network are provided. For example, a method of wireless communication performed by a user equipment can include: monitoring, in a search space of a shared radio frequency band, for downlink control information (DCI); receiving, from a base station based on the monitoring, the DCI, wherein the DCI includes an explicit interlace allocation but does not include an explicit resource block set allocation; determining, based on the received DCI, one or more resource block sets for transmitting an uplink communication; and transmitting, to the base station, the uplink communication using the one or more resource block sets and the explicit interlace allocation.