Group Downlink Control Channel for URLLC Resource Allocation
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Solution Overview
Problem
In wireless communication systems, the existing protocols for ultra-reliable/low-latency communications (URLLC) face inefficiencies when handling a large number of user equipment (UEs) transmitting negative acknowledgement (NACK) messages, as the control channel can become overwhelmed, leading to insufficient resources for retransmission grants.
Innovation Solution
Implementing a group downlink control channel that provides a unified resource configuration for UEs to retransmit semi-persistent scheduling (SPS) messages, allowing each UE to determine its unique retransmission resources from a single group message, reducing the need for individual resource allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual resource allocation is used for each UE transmitting NACK messages, then each UE receives dedicated retransmission resources, but the control channel becomes overwhelmed when many UEs transmit NACK messages
Solution Approach 1:
The patent merges individual resource allocation messages into a single group downlink control message that serves multiple UEs simultaneously. The group message contains resource allocation information that multiple UEs can interpret based on their specific identifiers, reducing control channel overhead while maintaining individualized resource allocation.
Solution Approach 2:
The group downlink control message serves multiple functions: it allocates resources to multiple UEs simultaneously, provides retransmission information, and enables UEs to self-identify their specific allocations through embedded identifiers. This multi-functional approach replaces multiple individual messages with a single universal message structure.
2Manufacturing precision
If per-UE resource grants are transmitted for each NACK message, then accurate resource allocation is achieved, but sufficient resources may not be available when many UEs require retransmission
Solution Approach 1:
Multiple resource grant allocations are merged into a single group message structure, allowing the base station to allocate resources to multiple UEs simultaneously without transmitting separate grant messages for each UE. This conserves control channel resources while maintaining precise individual allocations.
Solution Approach 2:
The patent changes the parameter structure of resource allocation by embedding UE-specific identifiers within the group message and using bitmap fields to indicate which UEs require retransmission. This parameter transformation enables efficient resource allocation to multiple UEs through a unified message format.
3Loss of information
If individual downlink control messages are sent to each UE, then specific resource information is provided accurately, but the control channel overhead increases significantly with many UEs
Solution Approach 1:
The patent combines multiple individual downlink control messages into a single group downlink control message that contains resource allocation information for multiple UEs. The message structure includes fields that allow each UE to identify its specific allocation, maintaining information accuracy while reducing control channel overhead.
Solution Approach 2:
The group message structure uses template-based resource allocation information that is copied and adapted for multiple UEs. Rather than transmitting unique messages for each UE, the system uses a standardized group message format with UE-specific parameters, reducing redundancy and control channel overhead.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may transmit semi-persistent scheduling (SPS) messages to a set of user equipments (UEs) using respective resources corresponding to each UE. The base station may receive, from each of a subset of UEs from the set of UEs, a negative acknowledgement (NACK) message associated with the SPS messages. The base station may transmit a group downlink control message including information associated with a downlink resource configuration for retransmission of the respective SPS messages to the subset of UEs. The base station may retransmit SPS messages to each of the subset of UEs using the downlink resource configuration.