Multicast and Unicast Scheduling Without DCI Size Mismatch
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently distinguishing between unicast and multicast transmissions, particularly in determining DCI sizes and resource allocation for simultaneous unicast and multicast operations, which affect network efficiency and reliability.
Innovation Solution
The proposed solution involves configuring UE-specific and group common PDCCHs with specific RNTIs for scrambling sequences, aligning DCI sizes, and managing bandwidth parts (BWPs) to enable simultaneous unicast and multicast transmissions without BWP switching delays, using methods like padding or truncating DCI fields based on BWP configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UE-specific PDCCH is used to schedule multicast TB, then individual UE control is improved, but DCI size determination and transmission management complexity increases
Solution Approach 1:
The patent segments the control information by introducing a specific field in the DCI that separates unicast and multicast TB scheduling information. This allows the DCI to be divided into distinct parts: unicast TB scheduling fields and multicast TB scheduling fields, enabling individual UE control while maintaining manageable complexity through structured segmentation.
Solution Approach 2:
The patent applies local quality by using different RNTI types (UE-specific RNTI for unicast, group-common RNTI for multicast) to identify and differentiate between unicast and multicast transmissions within the same DCI structure. This allows tailored control parameters for each transmission type while maintaining a unified scheduling framework.
2Productivity
If group common PDCCH is used to schedule multicast TB, then transmission efficiency is improved, but UE-specific control and differentiation capability deteriorates
Solution Approach 1:
The patent merges unicast and multicast TB scheduling into a single DCI structure that can be transmitted on UE-specific PDCCH. This combination allows the system to maintain the efficiency benefits of unified scheduling while preserving UE-specific control capabilities through differentiated RNTI usage and structured field separation within the DCI.
Solution Approach 2:
The patent creates a universal DCI structure that serves multiple functions: it can schedule unicast TBs using UE-specific RNTI, schedule multicast TBs using group-common RNTI, and handle both types of transmissions within a single control information framework. This multi-functionality resolves the contradiction by making the control mechanism adaptable to different transmission needs.
3Adaptability or versatility
If different configuration parameters are used for unicast and multicast transmission, then transmission adaptability is improved, but resource allocation and switching complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the DCI structure with designated fields for unicast and multicast TB scheduling parameters. This preliminary structuring allows the system to handle different transmission types with appropriate parameters without increasing real-time processing complexity, as the parameter differentiation is built into the control information format itself.
Data Source
AI summary
A wireless communication method includes receiving, by a wireless communication device from a network, first downlink control information on a first downlink channel in a first frequency resource. The first downlink control information schedules a first Transport Block (TB). The first downlink channel is specific to the wireless communication device. The method further includes receiving, by the wireless communication device from the network, the first TB on a second downlink channel in a second frequency resource. The first TB is received by a plurality of wireless communication devices. The second downlink channel is common to the plurality of wireless communication devices.