Channel Spacing for Channel Bandwidth Pairs in CA: Finding Common U
Currently, RAN4 is facing challenges in determining the nominal channel spacing for channel bandwidth pairs where no common largest U is found. This issue is discussed in the context of intra-band CA cases, with proposals to address it by either changing the reference table or providing specific provisions. Stakeholders like Huawei and HiSilicon are actively involved in finding solutions for this technical issue.
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Presentation Transcript
3GPP TSG-RAN WG4 #94bis-e April 20th 30th, 2020 Electronic meeting R4-200XXXX WF on CA channel spacing for channel bandwidth pairs where no common u is found Huawei, HiSilicon, [ ]
Background Currently, Nominal channel space for CA is specified with, where the reference table for 0 is Table 5.3.5-1: While in Table 5.3.5-1, there is some cases that no common largest can be found: Table 5.3.5-1 Channel bandwidths for each NR band NR band / SCS / E Channel bandwidth 20 MHz MHz MHz Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 904 MHz NR Band SCS kHz 15 30 60 15 30 60 15 30 60 10 MHz Yes Yes Yes Yes Yes Yes Yes Yes Yes 15 MHz Yes Yes Yes Yes Yes Yes Yes Yes Yes 25 30 40 MHz Yes Yes Yes Yes Yes Yes Yes Yes Yes 50 MHz Yes Yes Yes Yes Yes Yes Yes Yes Yes 60 MHz 80 MHz 100 MHz 5 MHz Yes Yes Yes Yes Yes n40 Yes Yes n41 Yes Yes Yes Yes Yes Yes Yes Yes3 Yes3 n50 Yes Yes
WF: No common can be found for some intra-band CA case RAN4 need to consider the case for No common largest can be found for intra-band CA, and find a way to specify the nominal channel space for such case How to deal with the issue will further discuss in next meeting: Option1:change the reference Table for 0adoption from Table 5.3.5-1 to Table 5.3.2-1 to ensure the common largest can be found. Table 5.3.2-1: Maximum transmission bandwidth configuration NRB 30 MHz 90 MHz 5 MHz 10 MHz 15 MHz 20 MHz 25 MHz 40 MHz 50 MHz 60 MHz 80 MHz 100 MHz SCS (kHz) NRB 160 78 38 NRB N/A 245 121 NRB 25 11 N/A NRB 52 24 11 NRB 79 38 18 NRB 106 51 24 NRB 133 65 31 NRB 216 106 51 NRB 270 133 65 NRB N/A 162 79 NRB N/A 217 107 NRB N/A 273 135 15 30 60 Option2: a specific provision to cover the corner cases Other options are not precluded
Reference [1] R4-2004776 on channel space for CA , Huawei, HiSilicon, RAN4#94bis-e [2] R4-2005087 email discussion summary on system parameter Rel-15 , ZTE, RAN4#94bis-e
