eRedCap UE Random Access With Limited PUSCH Bandwidth
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting reduced capability UEs (RedCap UEs) due to limitations in bandwidth reduction, which affect the reception of critical signals like SIB1, OSI, and Msg2, impacting network coexistence and efficiency.
Innovation Solution
A method for random access in wireless communication systems that involves reducing the PDSCH/PUSCH bandwidth for enhanced RedCap UEs (eRedCap) while maintaining compatibility with non-eRedCap UEs, using methods such as DCI indication, predefined frequency bands, or early identification to determine reception and transmission bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the PDSCH/PUSCH bandwidth is reduced for RedCap UEs, then device complexity and power consumption are reduced, but the reception of critical signals (SIB1, OSI, Msg2) is affected
Solution Approach 1:
The patent segments the bandwidth into different functional parts: a reduced bandwidth for data transmission (PDSCH/PUSCH) and a separate preserved bandwidth for critical control signals (SIB1, OSI, Msg2). This allows RedCap UEs to operate with reduced complexity while maintaining reliable reception of essential network signals through dedicated frequency resources.
2Use of energy by moving object
If the PDSCH/PUSCH bandwidth is reduced for RedCap UEs, then power consumption is reduced, but network coexistence and efficiency are impacted
Solution Approach 1:
The patent applies local quality by assigning different bandwidth characteristics to different functional requirements: RedCap UEs use reduced bandwidth for data traffic to minimize power consumption, while maintaining full bandwidth access for control plane signals to ensure network efficiency and proper operation. This localized optimization allows energy efficiency gains without compromising overall network productivity.
3Productivity
If separate bandwidth configurations are used for eRedCap and non-eRedCap UEs, then random access efficiency is improved, but device complexity increases
Solution Approach 1:
The patent introduces DCI (Downlink Control Information) as an intermediary mechanism that dynamically indicates the reception and transmission bands to eRedCap UEs. This mediator simplifies bandwidth management by providing clear, standardized instructions from the network, reducing UE complexity while maintaining efficient random access procedures through proper resource allocation.
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AI summary
A method of operating a user equipment (UE) in a wireless communication system is provided. The method includes transmitting a message 1 (Msg1) to a base station (BS); receiving, from the base station, a message 2 (Msg2) related to an uplink (UL) grant; and based on a transmission bandwidth indicated in relation to a physical uplink shared channel (PUSCH) including a Msg3 in the UL grant exceeding a PUSCH transmission bandwidth of the UE which is an enhanced reduced capability (eRedCap) UE, performing a retransmission of the Msg1 instead of a transmission of the PUSCH.