NPTEL 5G Wireless Standard Design Week 10 Assignment Answers 2024
1. Calculate the number of hops in hopping cycle for SRS with the following configuration
- CSRS=15
- bhop=0,BSRS=2
Note: Refer 6.4.1.4 Section, 38.211 Release-15 3GPP document for SRS Configuration table
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2. Select the possible configuration for transmistting 12-port CSI-RS
- 4xFDM + 2xTDM
- 4xCDM + 3xFDM
- 2xCDM + 4xFDM
- 2xCDM + 3xFDM + 2xTDM
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3. What is the maximum bandwidth (in terms of PRBs) that can be sounded using SRS when CSRS=25
Note: Refer 6.4.1.4 Section, 38.211 Release-15 3GPP document for SRS Configuration table
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4. Consider the following Configuration for SRS transmission
- CSRS=31
- bhop=0
Calculate the increase in SRS power density (in terms of dB) when transmitting withBSRS=2 compared to transmission with BSRS=1
Note: Refer 6.4.1.4 Section, 38.211 Release-15 3GPP document for SRS Configuration table
Answer :-
5. Paragraph : Generally, the multiple ports are all multiplexed onto the same comb through assignment of equally spaced cyclic shifts to the antenna ports, where all ports use the same base sequence. However, there is one exception, and that is for the case of a 4-port SRS resource when the cyclic shift greater than the (maximum cyclic shift)/2. In this case, the two pairs of ports {1000,1002} and {1001,1003} are multiplexed onto two different evenly spaced combs. The maximum cyclic shift possible for SRS with comb structure 2 is 8 (0-7) and for comb structure 4 is 12 (0-11).
Read the above paragraph and calculate the number of REs required to transmit a 4-port SRS sequence with the following configuration
- CSRS=13
- bhop=1,BSRS=1
- KTC=2
- R=1
- Cyclic Shift = 6.
Note: For additional reference refer to section 6.4.1.4 in TS38.211 v15.2.0.
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6. Maximum number of antenna ports that can be configured for CSI-RS transmission
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7. Calculate the value of NZC in SRS sequence generation for following configuration
- CSRS=22
- bhop=BSRS=1
- KTC=2
Answer :-
8. Select the Antenna port numbers corresponding to SRS transmission
- 3002
- 1003
- 2002
- 3001
- 1001
Answer :-
9. Consider the following Configuration for SRS transmission
- CSRS=9
- bhop=BSRS=1
Calculate the value of nRRC when upper most PRBs in the bandwidth part is used for sounding. Consider starting PRB index K has the following relation with nRRC
K=[⌊4nRRC/mSRS,b⌋ mod Nb]∗ mSRS,b , Take b=BSRS
Note: provide minimun value if multiple are possible
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10. Select the correct statements regarding SRS
- Hopping is enabled when bhop=BSRS
- Maximum of 4 ports can be configured for SRS transmission
- Z-C base sequence is same across all ports in SRS
- Power density of SRS is increased when sounding in smaller bandwidth
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