SBFD and Non-SBFD RACH Occasions for Lower-Latency Random Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently providing various services, particularly in high-frequency bands, due to limitations in random access procedures and resource allocation, which affect the performance and connectivity of user equipment (UE) in advanced communication systems like 5G and 6G.
Innovation Solution
Implementing a method and apparatus that support subband full duplex (SBFD) communication, allowing user equipment (UE) and base stations to utilize both SBFD and non-SBFD symbols for random access channel configurations, enabling efficient resource utilization and improved connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional random access procedures are used in high-frequency bands, then connection establishment is possible, but resource utilization efficiency deteriorates and latency increases
Solution Approach 1:
The random access procedure is segmented into two independent steps: (1) preamble transmission on PRACH, and (2) RACH message A transmission on PUSCH. This segmentation allows the UE to transmit both preamble and data simultaneously in synchronized slots, eliminating sequential waiting time and improving resource utilization efficiency while reducing overall access latency
Solution Approach 2:
The UE performs preliminary synchronization and resource allocation by receiving RACH configuration information from the base station before initiating random access. The base station pre-configures multiple RACH occasions and associates them with specific uplink resources, enabling the UE to immediately transmit synchronized preambles and data without additional negotiation delays
2Productivity
If random access in synchronized slots is enabled, then resource utilization improves, but interference from simultaneous transmission increases
Solution Approach 1:
Different RACH occasions are assigned to different synchronized slots with distinct time-frequency resource allocations. Each RACH occasion is locally optimized for specific transmission conditions, allowing simultaneous transmissions to occur in different resource regions without mutual interference, thereby maintaining high resource utilization while minimizing harmful interactions
3Adaptability or versatility
If multiple RACH occasions are configured, then access flexibility improves, but system complexity increases
Solution Approach 1:
The RACH configuration information structure is designed to universally support multiple RACH occasions through standardized parameters including time-domain resources, frequency-domain resources, and associated uplink resource indicators. This universal configuration framework enables flexible deployment of multiple occasions without increasing system complexity, as all occasions follow the same configuration pattern and can be managed through a single configuration message
Data Source
AI summary
A user equipment (UE) in a wireless communication system is provided. The UE includes a transceiver, and a controller coupled with the transceiver, and configured to receive, from a base station, first random access channel (RACH) configuration associated with a subband full duplex (SBFD) symbol and second RACH configuration associated with a non-SBFD symbol, and transmit, to the base station, a preamble on a first RACH occasion or a second RACH occasion, wherein the preamble is transmitted on the first RACH occasion in case that the first RACH occasion is valid.