5G Multicast Unicast Overlapped Signal Decoding via DMRS Mapping
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Solution Overview
Problem
There is a need for an efficient method to transmit and receive multicast and unicast signals in a 5G wireless communication system, particularly when these signals overlap in resource usage.
Innovation Solution
A method and apparatus that involve a terminal and base station, where the terminal receives information on unicast demodulation reference signal (DMRS) mapping resources, decodes multicast and unicast signals based on this information, and the base station transmits and maps signals considering the DMRS resources, allowing for efficient decoding and interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicast signal and unicast signal are transmitted through overlapping resources, then resource utilization efficiency is improved, but signal interference increases
Solution Approach 1:
The patent segments the resource elements into different sets: first resource elements for multicast signal and second resource elements for unicast signal. By dividing the overlapping resources into distinct segments with different functions, the system achieves efficient resource utilization while managing interference through structured separation.
Solution Approach 2:
The patent introduces an intermediary approach by having the terminal device receive and process both signals simultaneously using interference cancellation techniques. The base station transmits both signals with controlled power levels, and the terminal uses the known multicast signal structure as an intermediary reference to cancel interference when decoding the unicast signal.
2Reliability
If DMRS resources are allocated for unicast signal, then unicast signal decoding capability is improved, but multicast signal transmission efficiency deteriorates
Solution Approach 1:
The patent applies local quality by assigning different characteristics to different resource elements: first resource elements carry multicast signals with specific power levels, while second resource elements carry unicast signals with different power levels. This localized differentiation allows each signal type to be optimized for its specific decoding requirements without compromising the other.
Solution Approach 2:
The patent implements partial action by allocating DMRS resources selectively - only to the extent necessary for unicast signal decoding. The base station transmits unicast DMRS only in the second resource elements where unicast signals are present, rather than uniformly across all resources, thus maintaining decoding capability while minimizing overhead impact on multicast transmission.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method of controlling a terminal according to one embodiment of the present invention may comprise the steps of receiving, from a base station, set information including information on a location of at least one resource to which a demodulation reference signal (DMRS) of a unicast signal is to be mapped; receiving a multicast signal and the unicast signal from the base station; decoding the multicast signal on the basis of the set information; and decoding the unicast signal on the basis of the decoded multicast signal.