Downlink Multicast Control Channel Decoupling for Flexible Scheduling
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Solution Overview
Problem
Conventional communication systems face increased complexity in UEs due to a high correlation between downlink control and data channels, particularly in multicast scenarios, leading to inefficient resource usage and complexity for terminal devices.
Innovation Solution
A dynamic and flexible scheduling mechanism is introduced for multicast traffic, allowing control information to be transmitted in either a group-common or UE-specific manner based on multicast and broadcast service criteria, decoupling the scheduling of downlink control and data channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control information for multicast traffic is transmitted using a correlated signaling mechanism with data channel scheduling, then scheduling flexibility is improved, but UE complexity increases
Solution Approach 1:
The patent segments the control information transmission by separating multicast control information (MCCH) from unicast control information. MCCH is transmitted independently on the PDCCH with its own DCI format, allowing the UE to process multicast scheduling separately from unicast scheduling, thereby reducing overall complexity while maintaining flexibility.
Solution Approach 2:
The patent introduces dynamic switching capability between different control information transmission modes. The network can dynamically configure whether to use group-common PDCCH or UE-specific PDCCH for multicast traffic based on current network conditions and UE capabilities, optimizing the balance between scheduling flexibility and UE complexity in real-time.
2Productivity
If control information is transmitted in a group-common manner for multicast traffic, then resource efficiency is improved, but blind decoding complexity increases
Solution Approach 1:
The patent extracts and separates the multicast control information transmission from the general control information framework. By creating a dedicated MCCH transmission path with specific DCI formats and RNTI types, the UE can efficiently decode group-common control information without having to process all possible control information types, thereby reducing blind decoding complexity while maintaining resource efficiency.
3Reliability
If downlink control and data channels are highly correlated, then scheduling coordination is improved, but radio resource efficiency decreases
Solution Approach 1:
The patent introduces an intermediary mechanism through the MCCH configuration that mediates between control channel and data channel scheduling. The MCCH provides explicit configuration information about PDSCH resources for multicast traffic, allowing the network to coordinate control and data channels effectively while using separate transmission paths, thus improving radio resource efficiency without sacrificing scheduling coordination.
Data Source
AI summary
Embodiments of the present disclosure relate to downlink control and data channel configuration. A method comprises: determining, at a first device, a transmission scheme of control information for a second device based on at least one multicast and broadcast service related criterion, the control information related to scheduling multicast service traffic to the second device; transmitting, to the second device, configuration information for causing the second device to obtain the control information; and transmitting, to the second device and based on the determined transmission scheme, the control information on a control channel between the first device and the second device. In this way, the correlation between the scheduling mechanism of multicast traffic on the downlink data channel and the transmission mechanism of control information on the downlink control channel can be decoupled, resulting in a flexible and dynamic downlink channel configuration and an increased radio resource efficiency.