MU-MIMO Resource Scheduling via DM-RS Port Segmentation
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Solution Overview
Problem
Current MU-MIMO wireless communication systems are limited in supporting a high number of users due to signaling overhead and interference, with existing technologies only supporting up to four users in release 10 of 3GPP LTE, restricting the efficiency of MU-MIMO operation.
Innovation Solution
The implementation of methods and apparatuses to schedule resources and manage signaling overhead by identifying DM-RS ports and PDSCH EPRE to DM-RS EPRE ratios, enabling the support of high-order MU-MIMO operations by assigning multiple orthogonal DM-RS ports and optimizing resource allocation to reduce interference between users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of supported MU-MIMO users is increased beyond four, then the system capacity and efficiency are improved, but the signaling overhead and interference between users increase
Solution Approach 1:
The patent segments the downlink control information into two parts: first downlink control information containing resource allocation for a first user, and second downlink control information containing resource allocation for a second user. This segmentation allows multiple users to be served simultaneously with dedicated control information, reducing overall signaling overhead while increasing system capacity to support more than four MU-MIMO users.
2Productivity
If the number of supported MU-MIMO users is increased beyond four, then the system capacity and efficiency are improved, but the interference between users increases
Solution Approach 1:
The patent segments users into different groups (first user and second user) with separate downlink control information and resource allocations. This segmentation enables the system to manage and reduce interference between users by providing dedicated control channels and resources for each user group, thereby supporting higher system capacity with controlled interference levels.
Solution Approach 2:
The patent dynamically assigns different downlink control information formats and resource allocations based on the number of users and channel conditions. The system can adaptively switch between serving one or two users per downlink control information, optimizing the balance between system capacity and interference management in real-time.
3Measurement precision
If multiple orthogonal DM-RS ports are assigned to users, then channel estimation quality is improved, but the device complexity increases
Solution Approach 1:
The patent uses demodulation reference signals (DM-RS) that serve multiple functions: they provide channel estimation for multiple users simultaneously and support multiple orthogonal ports. By making the DM-RS universal and multi-functional, the system achieves improved channel estimation quality without proportionally increasing device complexity, as the same reference signal structure serves multiple purposes.
Data Source
AI summary
Methods and apparatuses schedule resources and identify resource scheduling in a MU MIMO wireless communication system. A method for identifying resource scheduling for a UE includes receiving downlink control information; identifying, from the downlink control information, one or more DM-RS ports assigned to the UE and a PDSCH EPRE to DM-RS EPRE ratio; and identifying data intended for the UE in a resource block in a downlink subframe using the one or more DM-RS ports and the PDSCH EPRE to DM-RS EPRE ratio. A method for scheduling resources includes identifying one or more DM-RS ports to assign to a UE and a PDSCH EPRE to DM-RS EPRE ratio for identifying data intended for the UE in a resource block in a downlink subframe; and including an indication of the one or more DM-RS ports and the PDSCH EPRE to DM-RS EPRE ratio in downlink control information.