Multi-User MIMO Control Channel Transmission Techniques
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Solution Overview
Problem
In wireless communications systems, control channel resources can become constrained when serving a large number of user equipment (UEs), leading to delays in downlink control information transmissions.
Innovation Solution
The implementation of multi-user (MU) MIMO transmissions using downlink control channel resources, where a base station configures separate subsets of control channel monitoring candidates for precoded and non-precoded control channel transmissions, allowing UEs capable of MIMO to monitor and receive precoded transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If control channel resources are shared among a large number of UEs, then the system can serve more users, but control information transmission delays increase
Solution Approach 1:
The control channel monitoring candidates are segmented into two distinct subsets: a first subset for precoded control channel transmissions and a second subset for non-precoded transmissions. This segmentation allows UEs to efficiently monitor only relevant candidates based on their capabilities, reducing monitoring overhead and improving response time while enabling the system to serve more UEs simultaneously.
Solution Approach 2:
The patent introduces a new dimension by defining separate control channel monitoring candidate subsets differentiated by precoding type. This dimensional separation in the control channel resource space allows for more efficient resource utilization and reduces contention, enabling the system to handle a larger number of UEs without increasing transmission delays.
2Productivity
If separate control channel monitoring candidate subsets are defined for precoded and non-precoded transmissions, then control information transmission efficiency improves, but system complexity increases
Solution Approach 1:
Different control channel monitoring candidate subsets are assigned based on local quality requirements of different UE types. Precoded transmissions (benefiting advanced UEs) use one subset while non-precoded transmissions (for legacy UEs) use another. This localized optimization improves overall transmission efficiency without requiring complete system redesign, as each subset can be independently configured and managed.
Solution Approach 2:
The system changes the parameter of control channel monitoring by introducing separate candidate subsets with different properties (precoded vs. non-precoded). This parameter differentiation allows efficient targeting of control information to appropriate UE types, improving transmission efficiency while managing complexity through parameter-based organization rather than structural overhaul.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described that provide for multiple-input multiple-output (MIMO) transmissions of control information using downlink control channel resources, such as physical downlink control channel (PDCCH) resources. The MIMO transmissions may provide control channel transmissions to multiple UEs using the same time-frequency resources. A base station may use a subset of control channel monitoring entities for MIMO control channel transmissions, and another subset of control channel monitoring candidates for non-MIMO control channel transmissions. Control channel monitoring entities for MIMO transmissions may be defined separately from non-MIMO or legacy control channel candidates.