Joint CSI Configuration for Virtual UE Coordination Sets
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Solution Overview
Problem
In wireless communication systems, managing a large number of user devices leads to extensive control channel overhead, reducing network efficiency, and poor signal strength or reception capability at user equipment (UE) locations, such as cell edges or due to fading effects, hampers effective communication.
Innovation Solution
A UE Coordination Set (UECS) is formed where UEs act as a single 'virtual' UE, with a master UE collecting individual reception capability information to determine a joint capability, reporting it to the base station, which then configures channel state information (CSI) for coordinated downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual UE configuration is performed separately for each UE, then each UE receives dedicated control information, but control channel overhead increases extensively reducing network efficiency
Solution Approach 1:
Multiple UEs are grouped into a UE Coordination Set (UECS) and treated as a single virtual UE for control information purposes. The base station sends a single control message to the UECS that contains configuration information applicable to all member UEs, thereby reducing control channel overhead while still providing dedicated configuration to each UE within the group.
2Productivity
If UE grouping is implemented to reduce overhead, then control channel efficiency improves, but the base station becomes unaware of changing joint reception capabilities of the UE group over time
Solution Approach 1:
A feedback mechanism is established where UEs in the UECS report their individual reception capabilities and channel conditions to the base station. The base station uses this feedback to dynamically update the UECS configuration and adapt control information transmission to match the current joint reception capabilities of the group, ensuring optimal performance as conditions change.
3Ease of operation
If UEs at cell edge or experiencing fading effects are served individually, then each UE receives tailored transmission parameters, but communication effectiveness diminishes due to poor signal strength
Solution Approach 1:
UEs experiencing poor signal conditions are grouped into a UECS where their combined reception capabilities are leveraged. The base station configures the UECS as a single entity with aggregated processing power, allowing the group to collectively receive and process control information and data transmissions, thereby improving reliability for UEs that would struggle individually.
Data Source
AI summary
A base station (BS) communicatively connected to a group including a first user equipment (UE) and a second UE can implement a method. The method includes determining (316 or 416), by processing hardware of the base station, a channel state information (CSI) process configuration for the group. The method also includes transmitting (318) a control signal including the CSI process configuration to the group, and transmitting (336) a reference signal to the group in accordance with the CSI process configuration. The method further includes, in response to transmitting the reference signal to the group, receiving (354) from at least one UE of the group an indication of joint channel state of the group.