Subband Full-Duplex Random Access for Lower Uplink Latency
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Solution Overview
Problem
Existing wireless communication systems face limitations in allocating random access occasions in subband full duplex symbols, leading to constraints on uplink resource selection and potential inefficiencies in uplink duty cycle, latency, and resource utilization.
Innovation Solution
A UE selects uplink resources from random access occasions based on a random access configuration table and index, utilizing subband full duplex symbols that include downlink or flexible symbols for transmitting random access messages, and receives configuration parameters to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random access occasions are allocated in subband full duplex symbols, then uplink resource utilization improves, but uplink duty cycle and latency are constrained
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands and divides symbols into different types (downlink, flexible, uplink). By allocating random access occasions specifically in flexible symbols within certain subbands, the system enables simultaneous downlink and uplink operations in different frequency portions, thereby improving uplink resource utilization without significantly increasing latency.
Solution Approach 2:
The patent introduces a frequency-dimensional solution by utilizing subband full duplex operation. Instead of only expanding time resources, it leverages the frequency dimension to create additional uplink opportunities in flexible symbols, allowing parallel transmission in different frequency subbands and thus improving resource utilization while maintaining time efficiency.
2Productivity
If traditional random access resource allocation is used, then system complexity remains low, but resource utilization and adaptability are limited
Solution Approach 1:
The patent implements dynamic resource allocation where the network can flexibly configure random access occasions in flexible symbols based on traffic conditions. The UE receives configuration parameters indicating which flexible symbols contain random access occasions, allowing the system to adapt resource allocation dynamically without requiring complex hardware changes.
Solution Approach 2:
The patent changes the configuration parameters to include indicators for flexible symbols containing random access occasions. By modifying the random access configuration to specify subband full duplex symbols, the system enables flexible resource allocation while maintaining compatibility with existing protocols and minimizing implementation complexity.
3Reliability
If uplink resources are restricted to traditional configurations, then collision probability is manageable, but uplink coverage and duty cycle are limited
Solution Approach 1:
The patent enables continuous uplink transmission opportunities by utilizing flexible symbols that can be dynamically allocated for random access. This creates a more continuous uplink duty cycle compared to traditional periodic allocations, improving both coverage and efficiency without significantly increasing collision probability due to the distributed nature of flexible symbol allocation.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a control signal including a random access configuration index, where the random access configuration index indicates a resource allocation pattern associated with random access occasions. In some examples, the UE may select one or more uplink resources from the random access occasions for transmitting a random access message based on a random access configuration table and the random access configuration index. In some cases, at least one of the uplink resources includes an uplink subband within a subband full duplex symbol, and the subband full duplex symbol is a downlink symbol or a flexible symbol. The UE may then transmit the random access message using the one or more uplink resources.