PUSCH DCI TRP Indication for Single and Multi-TRP Scheduling
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Solution Overview
Problem
Existing 3GPP NR Rel-15/16 UL DCI formats are only suitable for scheduling PUSCH transmission towards a single TRP, and there is a lack of support for scheduling to multiple TRPs using the same DCI format.
Innovation Solution
Introduce a new TRP indicator (TRPI) bit field in DCI formats 0_1 and 0_2 to dynamically indicate PUSCH transmission to a single TRP or multiple TRPs, allowing dynamic switching between single and multi-TRP scheduling, and include additional SRS resource sets, SRIs, TPMIs, and TPCs for each TRP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing 3GPP NR Rel-15/16 UL DCI formats are used, then the DCI format structure is simple and easy to implement, but the system cannot support PUSCH transmission to multiple TRPs
Solution Approach 1:
The DCI format is enhanced to perform multiple functions: it can schedule PUSCH transmission to a single TRP or to multiple TRPs (up to 4 TRPs) using the same format structure. This is achieved by incorporating a TRP indicator field and multiple SRI fields that can dynamically indicate different TRP configurations, allowing one DCI format to serve multiple scheduling purposes without requiring separate formats for single-TRP and multi-TRP scenarios.
2Adaptability or versatility
If a new TRP indicator bit field and additional SRS resource sets are introduced, then dynamic switching between single and multi-TRP scheduling is enabled, but the DCI message size and processing complexity increase
Solution Approach 1:
The DCI format incorporates dynamic fields that can change based on the scheduling scenario. The TRP indicator bit field dynamically indicates which TRP configuration is active, and the SRI fields can be selectively interpreted based on the TRP indicator value. This dynamic structure allows the system to adapt the DCI content to the specific scheduling needs, enabling efficient use of the enhanced format while supporting flexible TRP switching.
Solution Approach 2:
The patent changes key parameters of the DCI format by introducing a TRP indicator field with multiple possible values (e.g., 2-bit field indicating 1st TRP, 2nd TRP, 3rd TRP, or 4th TRP) and configuring multiple SRI fields (SRI0, SRI1, SRI2, SRI3) that can be activated based on the TRP indicator. This parameter-based approach allows the same DCI structure to support different TRP configurations without requiring separate message formats for each scenario.
3Reliability
If multiple SRI fields and associated TPMI/TPC parameters are configured for each TRP, then comprehensive multi-TRP scheduling is supported, but the configuration and signaling overhead increase
Solution Approach 1:
The patent segments the SRS resource configuration into multiple independent sets (first SRS resource set, second SRS resource set, etc.), each associated with a specific TRP. Each SRS resource set can be independently configured with its own SRI, TPMI, and TPC parameters. This segmentation allows the system to manage complex multi-TRP configurations by breaking them down into manageable, independently controllable units, where each segment corresponds to a specific TRP's uplink parameters.
Data Source
AI summary
A method, system and apparatus for dynamic indication of physical uplink shared channel (PUSCH) transmission to a single transmission/reception point (TRP) or multiple TRPs are disclosed. According to one aspect, a method in a network node includes configure the WD with a first sounding reference signal, SRS, resource set, and with a second SRS resource set for physical uplink shared channel, PUSCH, and schedule, by sending a downlink control information, DCI, to the WD, a PUSCH transmission by the WD in at least one PUSCH transmission occasion associated with one of the first SRS resource set, the second SRS resource set, and both the first and the second SRS resource sets.