5G NR DSS

 

Update 12.12.2020:

DSS Orange Romania B1+n1, tests with Xiaomi Mi10T Pro

https://forum.softpedia.com/topic/1073778-5g-orange-romania/page__st__4338#entry27261108

DSS activation in Xiaomi Mi 10T PRO: https://mt-tech.fi/en/modify-oneplus-7-pro-5g-8-and-8-pro-nr-lte-a-band-combos/#comment-787 

Info:  https://howltestuffworks.blogspot.com/2020/11/5g-nr-dss-dynamic-spectrum-sharing.html

DSS elements to look for:

In the UE Capabilities sent by UE:  rateMatchingLTE-CRS : supported


In the rrcConnectionReconfiguration sent by the NW: 

 1. frequencyShift7p5khz : true

2. lte-CRS-ToMatchAround -> carrierFreqDL : 312  . 312 = EARFCN for LTE B1.

3. mbsfn-SubframeConfigList[0] info


2020-12-12T10:53:39.020 D [LTE] RRC Connection Reconfiguration/RRC Reconfiguration (PDU),Radio Bearer Config (PDU)
Length : 765
Log Code : 0xB0C0
Timestamp : 2020-12-12 10:53:38.957
LTE RRC OTA Packet
version : 26
rrcRelNum : 15
rrcVerNum : 50
nrRrcRelNum : 15
nrRrcVerNum : 90
rbId : 1
phyCellId : 408
freq : 1600   >>>> LTE B3
sfn : 5908
pduNum : 9
sibMaskInSi : 0
msgLen : 732
Channel : 6
dl-dcch
message -> c1 -> rrcConnectionReconfiguration

..........................
  frequencyShift7p5khz : true
..........................
   lte-CRS-ToMatchAround -> carrierFreqDL : 312  
>>>> LTE B1
   carrierBandwidthDL : n50
mbsfn-SubframeConfigList[0]
radioframeAllocationPeriod : n4
radioframeAllocationOffset : 0
subframeAllocation1 -> fourFrames : '10100000 00001000 00000000'B(10487808)

 

 

 

 Previous information:

 https://www.sharetechnote.com/html/5G/5G_DSS.html

 https://www.keysightevent.com/kw2020/handout/pdf/a4/(A4)%205G%20NR%20Dynamic%20Spectrum%20Sharing%20Drivers%20&%20Test%20Implications_Alex%20Liang.pdf

 https://cdn.rohde-schwarz.com/ymkt/na/content/DSS_QA.pdf

 https://d86o2zu8ugzlg.cloudfront.net/mediatek-craft/documents/Dynamic-Spectrum-Sharing-WhitePaper-PDFDSSWP-031320.pdf

 https://cafetele.com/dss-dynamic-spectrum-sharing-5g-lte/?ck_subscriber_id=648314289 



 

1. Support in the NW:  take a look at SIB2:

LTE SIB2: configure MBSFN subframe location in a radio frame
• mbsfn-SubframeConfigList - mbsfn-SubframeConfig
• SFN mod radioFrameAllocationPeriod = radioFrameAllocationOffset
• subframeAllocation to configure MBSFN subframe location, for example, configure subframes 1 and 2 as MBSFN subframe

 

 

NSG:

MBSFN configured in SIB2 to indicate DSS

additionalSpectrumEmission : 1
     mbsfn-SubframeConfigList[0]
      radioframeAllocationPeriod : n4
      radioframeAllocationOffset : 0
      subframeAllocation -> fourFrames : '11000000 00001000 00000000'B(12584960) 




 

 

2. Support in the UE: look for "rateMatchingLTE-CRS : supported" in UE capabilities

UE capability: https://www.sharetechnote.com/html/5G/5G_DSS.html 

https://www.sharetechnote.com/html/5G/5G_DSS.html#UE_Capability 

rateMatchingLTE-CRS             ENUMERATED {supported}   

 

OnePlus 8 traces in TMO US: rateMatchingLTE-CRS : supported

 

LTE UE capabilities file :  https://pastebin.pl/view/6141b88b


LTE RRC OTA Packet
 version : 26
 rrcRelNum : 15
 rrcVerNum : 50
 nrRrcRelNum : 15
 nrRrcVerNum : 90
 rbId : 1
 phyCellId : 15
 freq : 5070
 sfn : 0
 pduNum : 11
 sibMaskInSi : 0
 msgLen : 515
 Channel : 8
ul-dcch

  criticalExtensions -> c1 -> ueCapabilityInformation-r8
   ue-CapabilityRAT-ContainerList[0]
    rat-Type : nr
    accessStratumRelease : rel15 

     ................

     supportedBandListNR[0]
      bandNR : 71

      ................
      rateMatchingLTE-CRS : supported
 

     supportedBandListNR[1]
      bandNR : 66  (see below the NSG SIB2 screenshot)

      ................
      rateMatchingLTE-CRS : supported

 

 

 

 

Samsung Service Mode 




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