Sidelink MU-MIMO Stream Coordination via UE Capability Signaling
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE and NR, face challenges in efficiently managing sidelink multi-user multiple input multiple output (MU-MIMO) communications due to limitations in user equipment (UE) capabilities being unaware of reception and transmission parameters, leading to potential stream drops, delays, and reduced network capacity.
Innovation Solution
User equipment (UE) transmits indications of its reception and transmission parameters for sidelink and downlink/uplink communications, allowing base stations and other UEs to coordinate stream transmissions aligning with these capabilities, ensuring supported configurations and enhancing network capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE transmits indications of reception and transmission parameters for sidelink and downlink/uplink communications, then stream coordination and network capacity are improved, but device complexity and signaling overhead increase
Solution Approach 1:
The UE transmits capability indications (reception parameters 620 and transmission parameters 615) in advance before actual MU-MIMO stream transmissions occur. This preliminary signaling allows the BS and other UEs to know the UE's capabilities beforehand, enabling them to coordinate stream transmissions that align with these capabilities, thereby preventing stream drops and delays while improving network capacity utilization.
Solution Approach 2:
The UE provides feedback about its reception and transmission capabilities to the BS and other UEs through capability indication messages. This feedback mechanism enables the network to adapt its MU-MIMO stream allocation and coordination strategies based on the actual capabilities of each UE, optimizing network capacity while ensuring reliable delivery.
2Speed
If MU-MIMO streams are transmitted without coordinating UE capabilities, then transmission speed and network utilization increase, but stream drops and delays occur
Solution Approach 1:
Capability indications are exchanged before MU-MIMO stream transmissions begin. The BS receives reception parameter indications from the UE and transmission parameter indications from other UEs, then uses this information to coordinate stream allocations that match UE capabilities, ensuring both high-speed transmission and reliable delivery.
Solution Approach 2:
The system dynamically adapts MU-MIMO stream coordination based on the capability indications received from UEs. The BS adjusts stream allocation, modulation and coding schemes, and resource assignment according to each UE's specific reception and transmission capabilities, enabling optimal performance without causing stream drops or delays.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit an indication of one or more reception parameters, of the UE, for sidelink communication and downlink communication. The UE may receive, based at least in part on the one or more reception parameters, at least one of one or more sidelink streams or one or more downlink streams. Numerous other aspects are provided.