Network-Initiated Random Access with Selective UL BWP Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing increased wireless data traffic and supporting various vertical applications, particularly in 5G/NR systems operating at higher frequencies, where beamforming and advanced network architectures are required to enhance coverage and capacity.
Innovation Solution
Implementing network-initiated random access procedures in wireless communication systems, where user equipment (UE) and base stations (BS) exchange UL bandwidth part (BWP) configurations and congestion information, allowing for selective UL BWP selection and transmission of random access preambles in optimized channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UL BWPs are configured for random access, then random access capacity and network efficiency are improved, but device complexity and configuration management difficulty increase
Solution Approach 1:
The uplink bandwidth is segmented into multiple UL BWPs (Bandwidth Parts), each configured with specific random access parameters. This segmentation allows different portions of the bandwidth to be used for different random access purposes, increasing overall random access capacity while maintaining manageable configuration through structured parameter sets for each BWP
Solution Approach 2:
Different UL BWPs are configured with varying parameters including bandwidth sizes, subcarrier spacings, and random access preamble configurations. By changing these parameters across different BWPs, the system optimizes random access for different conditions (e.g., coverage enhancement, high data rate) while the network manages complexity through centralized parameter configuration
2Adaptability or versatility
If UL BWP selection is performed by UE, then access flexibility is improved, but access collision and congestion increase
Solution Approach 1:
The network provides feedback to the UE regarding UL BWP selection through downlink messages indicating which UL BWP should be used for random access. This feedback mechanism allows the network to coordinate UE selections, maintaining access flexibility while reducing congestion by preventing multiple UEs from simultaneously selecting the same BWP
Solution Approach 2:
The network pre-configures multiple UL BWPs with different characteristics and randomly assigns them to UEs before random access occurs. This preliminary assignment reduces on-the-spot decision-making by UEs that could lead to collisions, while still providing flexibility through the pre-established BWP options tailored to different access scenarios
3Object-generated harmful factors
If random access is initiated by network, then network control and congestion management are improved, but UE autonomy and response time are reduced
Solution Approach 1:
The system implements dynamic random access initiation where the network can trigger random access procedures based on real-time conditions such as congestion levels, UE activity patterns, and network load. This dynamic approach allows the network to control access timing to manage congestion while minimizing delays by initiating access only when network conditions are favorable
Data Source
AI summary
A user equipment (UE) includes a transceiver. The transceiver is configured to receive, from a base station (BS), uplink (UL) bandwidth part (BWP) configurations for a plurality of UL BWPs of a cell, each of the UL BWP configurations including a random access (RA) configuration. The UE also includes a processor operatively coupled to the transceiver. The processor is configured to determine UL BWP selection information, and select, based on the UL BWP selection information, an UL BWP from the plurality UL BWPs for an RA procedure. The transceiver is also configured to transmit an RA preamble in an RA channel (RACH) occasion of the selected UL BWP.