Multi-TRP PUSCH Beam Selection Using CORESET Pool Indexes
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Solution Overview
Problem
The existing mobile communication systems face challenges in accommodating explosive data traffic, increasing transmission rates, supporting a large number of connected devices, reducing latency, and ensuring high energy efficiency, particularly in multi-TRP scenarios where all PUSCH transmissions are directed to a single TRP, leading to errors.
Innovation Solution
A method and apparatus for transmitting and receiving a PUSCH with individually determined default beams or spatial relationship reference signals for each TRP, using different control resource set pool indices, to prevent all PUSCH transmissions from being directed to a single TRP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single default beam is used for all PUSCH transmissions, then device complexity is reduced, but transmission reliability deteriorates in multi-TRP scenarios
Solution Approach 1:
The patent segments the single default beam into multiple default beams, each associated with a specific TRP. When multiple TRPs are configured, the UE determines different default beams for each TRP based on the lowest CORESET ID in each TRP group. This segmentation allows the system to maintain lower complexity by using default beams rather than dynamically configured beams, while simultaneously improving reliability by directing transmissions to the correct TRP.
2Device complexity
If all PUSCH transmissions are directed to a single TRP, then device complexity is reduced, but transmission accuracy deteriorates
Solution Approach 1:
The patent applies local quality by assigning different default beams to different TRPs based on their respective lowest CORESET IDs. Instead of using a uniform transmission approach for all TRPs, the system tailors the beam selection to each specific TRP's characteristics and position. This ensures that each PUSCH transmission is accurately directed to its intended TRP, improving transmission accuracy while maintaining manageable complexity through the use of predetermined default beams.
3Reliability
If multiple default beams are determined for multiple TRPs, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-determining default beams for each TRP based on the lowest CORESET ID in each TRP group during system configuration. These default beams are established in advance and stored in the UE, eliminating the need for complex real-time beam determination during transmission. When a PUSCH transmission is scheduled, the UE simply selects the appropriate pre-determined default beam based on which TRP is being targeted, thus improving reliability while keeping the actual transmission complexity low.
Data Source
AI summary
Disclosed are a method and device for transmitting and receiving a PUSCH in a wireless communication system. A method according to one embodiment of the present disclosure may comprise the steps of: receiving first DCI scheduling a first PUSCH transmission and second DCI scheduling a second PUSCH transmission, wherein the first DCI and the second DCI are received from a first CORESET and a second CORESET, respectively, having different CORESET pool indexes; and performing the first PUSCH transmission and the second PUSCH transmission on the basis of different spatial relationship RSs.