UE Beamforming for Dynamic Cell Switching
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Solution Overview
Problem
In next-generation wireless cellular communication systems, user equipment (UE) faces challenges in simultaneously monitoring control channel candidates from different transmission points (TRPs) due to the need for different receive beam directions, which affects control channel coverage and capacity.
Innovation Solution
The proposed solution involves UE reporting measurement results with signaling information about non-simultaneous reception of different TRPs, allowing the base station to design and configure the control channel search space. This includes supporting beam/polarization diversity transmission, dynamic point transmission, and control channel repetitions across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE monitors control channel candidates from different TRPs using different receive beam directions, then control channel capacity increases, but control channel coverage deteriorates due to inability to simultaneously receive from multiple directions
Solution Approach 1:
The patent implements dynamic point transmission where the TRP transmitting control channel candidates can be dynamically changed based on UE beam direction capabilities. The base station configures multiple TRPs and dynamically selects which TRP transmits to which UE based on current beam conditions, allowing the system to adapt to changing spatial requirements and maintain both coverage and capacity.
Solution Approach 2:
The control channel search space is segmented and configured separately for different TRPs. The base station divides the control channel resources across multiple TRPs, with each TRP responsible for specific search space sets. This segmentation allows UEs to monitor control channels from multiple TRPs without requiring simultaneous reception capability, as each TRP's control channel candidates are transmitted in dedicated time-frequency resources.
2Reliability
If UE establishes separate receive beams for different eNBs, then reception quality from each eNB improves, but device complexity increases due to multiple beam management requirements
Solution Approach 1:
The patent enables a single TRP to serve multiple UEs with different beam requirements, and a single UE to receive from multiple TRPs using different beams. The base station's control channel configuration mechanism provides universal support for multi-TRP operations, where the same configuration framework handles diverse beam scenarios without requiring dedicated complex beam management for each UE-TRP pair.
Solution Approach 2:
The base station acts as an intermediary that manages the complexity of multi-TRP beam operations. By centralizing the configuration and coordination of control channel candidates across multiple TRPs, the base station relieves the UE from having to independently manage complex beam switching and synchronization, simplifying the UE's beam management while maintaining high reception quality.
3Productivity
If control channel candidates are transmitted from multiple TRPs, then control channel capacity increases, but signal quality deteriorates due to non-simultaneous reception limitations
Solution Approach 1:
The patent implements periodic control channel transmissions from different TRPs in a time-division manner. Control channel candidates from different TRPs are transmitted in different periodic intervals or time slots, allowing UEs to sequentially receive and process control channels from multiple TRPs without requiring simultaneous reception. This periodic transmission pattern maintains signal quality by dedicating time resources to each TRP while still achieving increased control channel capacity through multi-TRP support.
Data Source
AI summary
The first circuitry may be operable to establish a first UE Receive (Rx) beam as being for reception of data from a first eNB. The second circuitry may be operable to process a transmission including Downlink Control Information (DCI), wherein the DCI carries an eNB cell-switching indicator. The first circuitry may also be operable to establish a second UE Rx beam as being for reception of data from a second eNB based on the eNB cell-switching indicator.