Proposal and Analysis of Architecture for DC 8A-20A_n28A in Electronic Meeting
Explore the proposal and analysis for the architecture and device type related to DC 8A-20A_n28A discussed in the electronic meeting. Companies provided insight into MSD estimation and feasibility considerations for smartphone antennas. References and assumptions on MSD calculation and architecture parameters are highlighted.
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Presentation Transcript
3GPP TSG-RAN WG4#99-e Electronic Meeting, May 19 27, 2021 R4-2107804 WF on architecture and device type for DC_8A-20A_n28A Huawei, HiSilicon, [Qualcomm Incorporated]
Background DC_8-20_n28 was requested in RANP#90 and start discussion in RAN4#98-e meeting. Based on the approved WF [1], companies are encouraged to provide analysis/discussion for the combination DC_8A-20A_n28A. In this meeting, companies [2] [3] provided some analysis on this topic. Some assumptions are made to further study the MSD level due to IMD3 of band 20 and n28 Tx.
Assumptions on MSD calculation FE architecture: Attenuation and isolation values: General linearity parameters: Attenuation and Isolation Parameter Antenna ISO PA gain PCB isolation Paout-Pain n28 Tx attenuation at Band 8 Rx B20 Tx attenuation at B8 RX The Triplexer isolation between band 20 Tx and band n28A Tx Component IP3(dBm) Value (dB) Comment Antenna switch 68 10 25 60 Diplexer 86 PCB isolation (PA forward mixing) Triplexer/Duplexer 74 27 PA forward mixing 30 43 PA reverse mixing 28 50 LNA -6
WF Proposal 1: Companies are encouraged to provide MSD estimation in next meeting based on the assumptions. Company can further check the provided parameters as a starting point. To analysis the IMD3 of Tx band 20 + band n28 may fall into Rx of band 8 Proposal 2: It s FFS whether the 3 LB antenna approach is not feasible in a smartphone due to the correlation issue. FFS if it may be restricted to FWA
References # TDoc Title Source Way forward on analysis and framework of LB-LB-LB combinations 1 R4-2105337 MediaTek, Vodafone 2 R4-2111478 LB_LB_MB MSD and LB_LB_LB Feasibility Qualcomm Incorporated 3 R4-2110243 TP for TR 37.717-21-11: DC_8A-20A_n28A Huawei, HiSilicon
