Random Access Occasions for Full-Duplex Wireless Devices
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing random access occasions for full-duplex capable wireless devices, leading to increased latency and reduced reliability due to invalid random access occasions.
Innovation Solution
A network entity transmits a set of synchronization signal blocks (SSBs) indicating both a first set of random access occasions for half-duplex devices and a second set of random access occasions specifically for full-duplex devices, which are differentiated and potentially offset in time or frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single set of random access occasions is used for all devices, then the system structure remains simple, but full-duplex devices experience invalid random access occasions leading to increased latency and reduced reliability
Solution Approach 1:
The patent segments the random access occasions into two distinct sets: a first set for half-duplex devices and a second set for full-duplex devices. This segmentation allows each device type to access appropriately configured random access occasions, eliminating the invalid occasions that occur when a single unified set is used. The network entity transmits separate indications for each set through SSBs, enabling full-duplex devices to reliably identify valid random access occasions without interference from half-duplex device requirements.
2Loss of time
If separate random access occasions are provided for full-duplex devices, then latency is reduced and reliability is improved, but the system complexity increases
Solution Approach 1:
The patent employs a universal indication mechanism where synchronization signal blocks (SSBs) serve multiple functions: they indicate both the first set of random access occasions for half-duplex devices and the second set for full-duplex devices. The network entity transmits configuration information that universally applies to both device types through the same SSB structure, allowing the system to provide differentiated random access occasions without proportionally increasing overall system complexity. Devices selectively process the indicated occasions based on their duplex capability.
3Reliability
If invalid random access occasions are not differentiated, then the configuration process is simplified, but communication reliability deteriorates due to failed access attempts
Solution Approach 1:
The patent applies local quality by providing tailored random access occasion configurations specifically suited to each device type's operational characteristics. Full-duplex devices receive indications for random access occasions that account for their ability to transmit and receive simultaneously, while half-duplex devices receive configurations appropriate for their sequential operation. This localized optimization ensures that each device type experiences reliable random access without requiring complex global reconfiguration, as the differentiation is applied locally to each device category through selective SSB indication.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network entity may transmit a set of synchronization signal blocks (SSBs) to a user equipment (UE). The set of SSBs may indicate both a first set of random access occasions and a second set of random access occasions that may be different than the first set of random access occasions. The second set of random access occasions may be associated with full-duplex capable wireless devices (e.g., UEs). As such, the network entity may monitor both the first set of random access occasions and the second set of random access occasions. Based on the monitoring, the network entity may receive a random access preamble from a UE during a random access occasion. The UE may transmit the random access preamble during the random access occasion based on the UE being a full-duplex capable wireless device.