Base Station DCI Control for REDCAP Random Access
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Solution Overview
Problem
Reduced Capability New Radio (REDCAP) devices have limited antenna numbers and reduced downlink coverage performance, leading to network coverage issues and inadequate message transmission in random access procedures.
Innovation Solution
Implementing enhanced control parameters in downlink control information (DCI) to improve message transmission for REDCAP UEs, including increased emitting power and transmission repetitions for downlink and uplink signaling, tailored specifically for REDCAP UEs to enhance signal strength and fault tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If REDCAP UE uses miniaturized antenna design to reduce device complexity and cost, then device portability and manufacturing cost are improved, but downlink coverage performance and message transmission reliability deteriorate
Solution Approach 1:
The patent changes transmission parameters specifically for REDCAP UEs by introducing enhanced control parameters in DCI format 1_0. These parameters include increased emitting power and transmission repetitions for downlink messages (Msg2, Msg4) and uplink messages (Msg3), which compensates for the reduced antenna performance while maintaining device miniaturization
Solution Approach 2:
The patent segments the control information by creating a dedicated enhanced control indication field within DCI format 1_0 that is specifically tailored for REDCAP UEs. This segmentation allows different transmission parameters to be applied to different UE types, enabling targeted coverage enhancement without affecting other UEs
2Device complexity
If REDCAP UE has limited number of antennas to reduce device complexity, then device cost and complexity are reduced, but downlink coverage performance deteriorates
Solution Approach 1:
The patent applies parameter changes by configuring enhanced control parameters that increase the emitting power and number of transmission repetitions for downlink messages sent to REDCAP UEs. This compensates for the limited antenna coverage capability while maintaining the simplified device structure
Solution Approach 2:
The patent implements periodic action through transmission repetitions, where downlink messages (Msg2, Msg4) and uplink messages (Msg3) are transmitted multiple times with increased power. This periodic retransmission extends the effective coverage distance for REDCAP UEs with limited antennas
3Reliability
If enhanced control parameters are applied to REDCAP UEs to improve message transmission, then message transmission success rate is improved, but system complexity increases
Solution Approach 1:
The patent achieves universality by modifying the existing DCI format 1_0 structure to include an enhanced control indication field that can serve both traditional UEs and REDCAP UEs. The enhanced parameters are only activated when the UE type indication matches REDCAP, allowing the same control structure to handle multiple UE types with different requirements
Solution Approach 2:
The patent implements self-service by enabling REDCAP UEs to autonomously identify their own type through the UE type indication field in DCI format 1_0 and automatically apply the appropriate enhanced control parameters without requiring separate configuration messages or manual intervention
Data Source
AI summary
A method for transmitting information is performed by a base station. The method comprises: sending downlink control information (DCI) carrying an enhanced control indication. The enhanced control indication comprises: an enhanced control parameter for random access of a first-type user equipment (UE) having a first reception capability. The enhanced control parameter is used for enhancing message transmission in a random access process for the first-type UE.