Single-DCI Multi-Channel Signaling for Lower-Latency URLLC
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Solution Overview
Problem
Existing DCI designs in LTE and NR do not efficiently indicate multiple data channels, leading to latency issues in ultra-reliable and low-latency communication (URLLC) services due to retransmissions when PDCCH or PDSCH decoding fails.
Innovation Solution
A new DCI design that allows concurrent transmission of multiple data channels on non-overlapping frequency resources, with control information for each channel, enabling simultaneous decoding of data packets in a single control message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single DCI indicates only one data channel, then the control message structure remains simple, but latency increases due to retransmissions when decoding fails
Solution Approach 1:
The patent combines multiple data channel indications into a single DCI message. The DCI now includes multiple sets of resource allocation information, modulation and coding schemes, and other control parameters for multiple PDSCH channels, allowing the UE to decode multiple data channels simultaneously without requiring multiple separate control messages
Solution Approach 2:
The DCI structure is segmented into multiple independent data channel indication sections. Each section contains complete control information for a specific PDSCH channel, including resource allocation, MCS, HARQ process number, and other parameters, allowing the UE to independently decode each data channel while receiving them in a single control message
2Productivity
If multiple data channels are transmitted concurrently, then data transmission efficiency improves, but the risk of decoding failure increases
Solution Approach 1:
The network provides preliminary error protection by configuring the UE with multiple DCI indications containing redundant control information for each data channel. The UE uses this pre-provided control information to attempt decoding of multiple PDSCH channels simultaneously, and can fall back to alternative decoding paths if initial attempts fail, thereby maintaining high transmission efficiency while improving reliability
3Reliability
If retransmission is performed upon decoding failure, then reliability is maintained, but latency increases
Solution Approach 1:
The patent applies preliminary action by providing the UE with multiple DCI indications that contain control information for multiple PDSCH channels in advance. The UE attempts to decode multiple data channels simultaneously using this pre-provided information. If decoding succeeds on any channel, the UE immediately sends ACK without waiting for retransmission, thereby maintaining reliability while minimizing latency. Retransmission is only performed if all initial decoding attempts fail
Data Source
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AI summary
The invention relates to for indication of multiple data channels in a single control message. A network access node (100) transmits a control message (502) to a client device (300). The control message (502) comprises a first control information (504) associated with a first data channel (510) and a second control information (506) associated with a second data channel (512). The first data channel (510) and the second data channel (512) do not overlap in frequency. The network access node (100) further concurrently transmit a first data packet (D1) in the first data channel (510) and a second data packet (D2) in the second data channel (512) to the client device (300). Furthermore, the invention also relates to the client device (300), corresponding methods, and a computer program.