Control Channel Repetition for Reliable RAR Scheduling Detection
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Solution Overview
Problem
User equipment (UE) may struggle to detect scheduling information for a data channel indicated on a control channel, particularly near cell edges or under interference, leading to inefficiencies in wireless communication systems.
Innovation Solution
The base station repeatedly sends scheduling information on a control channel, with defined rules for the UE to determine the slot index for the data channel, using information such as repetition count, payload, aggregation level, frequency resources, and search space configuration to enhance detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station sends scheduling information on a control channel, then the UE can detect scheduling for the data channel, but the UE may be unable to detect the control channel slot when near cell edge or experiencing interference
Solution Approach 1:
The base station transmits the same scheduling information repeatedly across multiple control channel slots according to a determined schedule. The UE monitors these periodic transmissions and can successfully detect the scheduling information from at least one repetition, thereby overcoming detection failures caused by interference or cell edge conditions.
2Reliability
If the base station repeatedly sends scheduling information on control channel slots, then detection reliability improves, but the slot index of control channel slots becomes unusable as reference slot
Solution Approach 1:
The scheduling information transmission is segmented across multiple control channel slots, with each slot containing a repetition of the same information. The UE is configured to monitor specific slots according to a schedule and can identify the scheduling information from any valid repetition, thereby preserving slot index usability while achieving reliable detection through repetition.
3Measurement precision
If the UE monitors multiple control channel slots for scheduling information, then detection accuracy improves, but the complexity of determining slot index increases
Solution Approach 1:
The UE autonomously determines the monitoring schedule based on configuration information received from the base station. The configuration includes parameters such as repetition count, time offsets, and slot patterns, enabling the UE to self-configure its monitoring behavior without complex external control, thereby reducing device complexity while maintaining detection accuracy.
Data Source
AI summary
A first apparatus may determine a first schedule associated with the one or more repetitions of the control information on the control channel based on the first information. The first apparatus may receive, from the network, at least one of the one or more repetitions of the control information on the control channel based on the first schedule, wherein the control information indicates a second schedule associated with a random access response (RAR) on a data channel. The first apparatus may receive, from the network, the RAR on the data channel based on the second schedule.