TR 37.867
Downlink interruption for band combinations to conduct dynamic Tx Switching

3GPP‑Page CONTENT_↓

V17.0.0 (Wzip) 2022/03 14 p.

Rapporteur:: Ms. Shan, Huiping
CATT

Content for TR 37.867 Word version: 17.0.0

1 Scope p. 6

The present document is a technical report for WI "downlink interruption for band combinations to conduct dynamic Tx Switching" under Rel-17 time frame. The purpose is to gather the relevant background information and studies in order to address the band combinations requested for mandating no DL interruption to conduct dynamic Tx switching listed in Table 1-1.

Table 1-1: Band combinations requested for mandating no DL interruption

Configuration	Uplink configuration	Company
CA_n5-n78, DC_5_n78	CA_n5-n78, DC_5_n78	China Telecom
CA_n1-n3-n78	CA_n1-n78, CA_n3-n78	China Telecom, China Unicom
CA_n3-n40-n41	CA n3-n40, CA n3-n41	CMCC
CA_n3-n41-n79	CA n3-n41, CA n3-n79, CA n41-n49	CMCC
CA_n39-n41-n79	CA n39-n79, CA n41-n79, CA n39-n41	CMCC
CA_n40-n41-n79	CA n40-n79, CA n41-n79	CMCC
CA_n8-n39-n41	CA n8-n39, CA n8-n41, CA n39-n41	CMCC
CA_n8-n41-n79	CA n8-n41, CA n8-n79, CA n41-n79	CMCC

2 References p. 6

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[1]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

TS 38.101-1: NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone

3 Definitions of terms, symbols and abbreviations p. 6

3.1 Terms p. 6

For the purposes of the present document, the terms given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2 Symbols p. 6

For the purposes of the present document, the following symbols apply:

3.3 Abbreviations p. 6

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.

4 Background p. 7

At 3GPP RAN#90-e meeting, a new Rel-17 Work Item "Down link interruption for band combinations to conduct dynamic Tx Switching" was approved. The objectives are as follows,

Discuss and specify inter-band uplink CA and EN-DC combinations for which DL interruption is not allowed when 1Tx-2Tx dynamic switching between two uplink carriers is conducted.
1. Based on the requested band combinations from operators, identify if it is feasible to specify no DL interruption in RAN4 specification.
2. Discuss and find out an appropriate way to indicate no DL interruption for higher order CA and EN-DC combinations in RAN4 specification.
For 1Tx-2Tx switching between two uplink carriers, the mandating of no DL interruption for new band combinations is release independent from Rel-16.

The present document is the technical report for this basket Work Item.

4.1 TR Maintenance p. 7

A single company is responsible for introducing all approved TPs in the current TR, i.e. TR editor. However, it is the responsibility of the contact person of each band/band combination to ensure that the TPs related to the band/band combination have been implemented.

5 General p. 7

6 Specific Band Combinations p. 7

6.1 Inter-band uplink CA p. 7

6.1.1 CA _n3-n40-n41 p. 7

6.1.1.1 Configurations p. 7

Configuration	Uplink configuration
CA_n3-n40-n41	CA n3-n40, CA n3-n41

6.1.1.2 Technical analysis p. 7

RAN4 already agreed that no DL interruption allowed for CA_n3-n41.

For CA_n3-n40, there was no discussion on the applicability of DL interruption. Since the frequency gap between n3 and n40 is larger than 1.4GHz, the separation is large enough. So no DL interruption for uplink configuration CA_n3-n40 should be allowed.

So for the uplink configurations CA n3-n40 and CA n3-n41 of CA_n3-n40-n41, no DL interruption for dynamic switching between two uplink carriers should also be mandated.

6.1.1.3 Conclusion p. 8

Table 6.1.1.3-1: Inter-band CA operating bands involving FR1 (three bands)

NR CA Band	NR Band (Table 5.2-1)	DL interruption allowed (Note 3)
CA_n3-n40-n41	n3, n40, n41	No for CA n3-n40, CA n3-n41
NOTE 1: The frequency range below 2506 MHz for Band n41 is not used in this band combination. NOTE 2: Applicable for frequency range above 4800 MHz for Band n79 in this band combination. NOTE 3: Applicable when dynamic Tx switching between two uplink carriers or two uplink bands is conducted. The DL interruption requirement is specified in clause 8.2.2.2.10 of TS 38.133.

6.1.2 CA_n3-n41-n79 p. 8

6.1.2.1 Configurations p. 8

Configuration	Uplink configuration
CA_n3-n41-n79	CA n3-n41, CA n3-n79, CA n41-n49

6.1.2.2 Technical analysis p. 8

RAN4 already agreed that no DL interruption allowed for CA_n3-n41, CA_n3-n79 and CA n41-n79. And for TDD band combination CA_n41-n79, simultaneous Rx/Tx capability is mandatory supported.

So for the uplink configurations CA n3-n41, CA n3-n79, CA n41-n49 of CA_n3-n41-n79, no DL interruption for dynamic switching between two uplink carriers should also be mandated.

6.1.2.3 Conclusion p. 8

Table 6.1.2.3-1: Inter-band CA operating bands involving FR1 (three bands)

NR CA Band	NR Band (Table 5.2-1)	DL interruption allowed (Note 3)
CA_n3-n41-n79	n3, n41, n79	No
NOTE 1: The frequency range below 2506 MHz for Band n41 is not used in this band combination. NOTE 2: Applicable for frequency range above 4800 MHz for Band n79 in this band combination. NOTE 3: Applicable when dynamic Tx switching between two uplink carriers or two uplink bands is conducted. The DL interruption requirement is specified in clause 8.2.2.2.10 of TS 38.133.

6.1.3 CA_n8-n39-n41 p. 8

6.1.3.1 Configurations p. 8

Configuration	Uplink configuration
CA_n8-n39-n41	CA n8-n39, CA n8-n41, CA n39-n41

6.1.3.2 Technical analysis p. 9

RAN4 already agreed that no DL interruption allowed for CA_n8-n41 and CA_n39-n41.

For CA_n8-n39, there was no discussion on the applicability of DL interruption. Since the frequency gap between n8 and n39 is 1GHz, the separation is large enough. So no DL interruption for uplink configuration CA_n8-n39 should be allowed.

So for the uplink configurations CA n8-n39, CA n8-n41 and CA n39-n41 of CA_n8-n39-n41, no DL interruption for dynamic switching between two uplink carriers should also be mandated.

6.1.3.3 Conclusion p. 9

Table 6.1.3.3-1: Inter-band CA operating bands involving FR1 (three bands)

NR CA Band	NR Band (Table 5.2-1)	DL interruption allowed (Note 3)
CA_n8-n39-n41	n8, n39, n41	No
NOTE 1: The frequency range below 2506 MHz for Band n41 is not used in this band combination. NOTE 2: Applicable for frequency range above 4800 MHz for Band n79 in this band combination. NOTE 3: Applicable when dynamic Tx switching between two uplink carriers or two uplink bands is conducted. The DL interruption requirement is specified in clause 8.2.2.2.10 of TS 38.133.

6.1.4 CA_n8-n41-n79 p. 9

6.1.4.1 Configurations p. 9

Configuration	Uplink configuration
CA_n8-n41-n79	CA n8-n41, CA n8-n79, CA n41-n79

6.1.4.2 Technical analysis p. 9

RAN4 already agreed that no DL interruption allowed for CA n8-n41, CA n8-n79 and CA n41-n79.

So for the uplink configurations CA n8-n41, CA n8-n79 and CA n41-n79 of CA_n8-n41-n79, no DL interruption for dynamic switching between two uplink carriers should also be mandated.

6.1.4.3 Conclusion p. 10

Table 6.1.4.3-1: Inter-band CA operating bands involving FR1 (three bands)

NR CA Band	NR Band (Table 5.2-1)	DL interruption allowed (Note 3)
CA_n8-n41-n79	n8, n41, n79	No
NOTE 1: The frequency range below 2506 MHz for Band n41 is not used in this band combination. NOTE 2: Applicable for frequency range above 4800 MHz for Band n79 in this band combination. NOTE 3: Applicable when dynamic Tx switching between two uplink carriers or two uplink bands is conducted. The DL interruption requirement is specified in clause 8.2.2.2.10 of TS 38.133.

6.1.5 CA_n39-n41-n79 p. 10

6.1.5.1 Configurations p. 10

Configuration	Uplink configuration
CA_n39-n41-n79	CA n39-n79, CA n41-n79, CA n39-n41

6.1.5.2 Technical analysis p. 10

RAN4 already agreed that no DL interruption allowed for CA_n39-n79, CA n41-n79 and CA_n39-n41 [1].

So for the uplink configurations CA_n39-n79, CA n41-n79 and CA_n39-n41 of CA_n39-n41-n79, no DL interruption for dynamic switching between two uplink carriers should also be mandated.

6.1.5.3 Conclusion p. 10

Table 6.1.5.3-1: Inter-band CA operating bands involving FR1 (three bands)

NR CA Band	NR Band (Table 5.2-1)	DL interruption allowed (Note 3)
CA_n39-n41-n79	n39, n41, n79	No
NOTE 1: The frequency range below 2506 MHz for Band n41 is not used in this band combination. NOTE 2: Applicable for frequency range above 4800 MHz for Band n79 in this band combination. NOTE 3: Applicable when dynamic Tx switching between two uplink carriers or two uplink bands is conducted. The DL interruption requirement is specified in clause 8.2.2.2.10 of TS 38.133.

6.1.6 CA_n40-n41-n79 p. 10

6.1.6.1 Configurations p. 10

Configuration	Uplink configuration
CA_n40-n41-n79	CA n40-n79, CA n41-n79

6.1.6.2 Technical analysis p. 11

RAN4 already agreed that no DL interruption allowed for CA_n40-n79 and CA n41-n79.

So for the uplink configurations CA_n40-n79 and CA n41-n79 of CA_n40-n41-n79, no DL interruption for dynamic switching between two uplink carriers should also be mandated.

6.1.6.3 Conclusion p. 11

Table 6.1.6.3-1: Inter-band CA operating bands involving FR1 (three bands)

NR CA Band	NR Band (Table 5.2-1)	DL interruption allowed (Note 3)
CA_n40-n41-n791,2	n40, n41, n79	No for CA n40-n79, CA n41-n79
NOTE 1: The frequency range below 2506 MHz for Band n41 is not used in this band combination. NOTE 2: Applicable for frequency range above 4800 MHz for Band n79 in this band combination. NOTE 3: Applicable when dynamic Tx switching between two uplink carriers or two uplink bands is conducted. The DL interruption requirement is specified in clause 8.2.2.2.10 of TS 38.133.

6.1.7 CA_n3-n40 p. 11

6.1.7.1 Configurations p. 11

Configuration	Uplink configuration
CA_n3-n40	CA n3-n40

6.1.7.2 Technical analysis p. 11

The frequency gap between n3 and n40 is larger than 400MHz, the separation is large enough. So no DL interruption for uplink configuration CA_n3-n40 should be allowed.

So for the uplink configurations CA n3-n40, no DL interruption for dynamic switching between two uplink carriers should also be mandated.

6.1.7.3 Conclusion p. 12

Table 6.1.7.3-1: Inter-band CA operating bands involving FR1 (three bands)

NR CA Band	NR Band (Table 5.2-1)	DL interruption allowed (Note 8)
CA_n3-n40	n3, n40	No
NOTE 1: Applicable for UE supporting inter-band carrier aggregation with mandatory simultaneous Rx/Tx capability. NOTE 2: The frequency range in band n28 is restricted for this band combination to 703-733 MHz for the UL and 758-788 MHz for the DL. NOTE 3: The frequency range below 2506 MHz for Band n41 is not used in this combination. NOTE 4: Applicable for frequency range above 4800 MHz for Band n79 in this combination. NOTE 5: For UEs supporting band n77, the minimum requirements apply only when there is non-simultaneous Rx/Tx operation between n78-n79 NR carriers. This restriction applies also for these carriers when applicable NR CA configuration is part of a higher order configuration. NOTE 6: The PCell is allocated in the licensed band in this combination. NOTE 7: The minimum requirements apply only when there is non-simultaneous Rx/Tx operation between n77-n79 NR carriers. This restriction applies also for these carriers when applicable NR CA configuration is part of a higher order configuration. NOTE 8: Applicable when dynamic Tx switching between two uplink carriers or two uplink bands is conducted. The DL interruption requirement is specified in clause 8.2.2.2.10 of TS 38.133.

6.1.8 CA_n1-n3-n78 p. 12

6.1.8.1 Configurations p. 12

Configuration	Uplink configuration
CA_n1-n3-n78	CA_n1-n78, CA_n3-n78

6.1.8.2 Technical analysis p. 12

For CA_n1-n78 and CA_n3-n78, no DL interruption allowed has been specified as mandated in 38.101-1, which means switching from n1/n3 to n78 has no impact to n1/n3 downlink. Thus there is no DL interruption for CA_n1-n3-n78 with CA_n1-n78 or CA_n3-n78 uplink configuration when conducting dynamic Tx switching.

6.1.8.3 Conclusion p. 12

No DL interruption for CA_n1-n3-n78 with CA_n1-n78 or CA_n3-n78 uplink configuration is mandated.

Table 6.1.8.3-1: Inter-band CA operating bands involving FR1 (three bands)

NR CA Band	NR Band (Table 5.2-1)	DL interruption allowed (Note 3)
CA_n1-n3-n78	n1, n3, n78	No for CA_n1-n78, CA_n3-n78
NOTE 1: The frequency range below 2506 MHz for Band n41 is not used in this band combination. NOTE 1: Applicable for frequency range above 4800 MHz for Band n79 in this band combination. NOTE 1: Applicable when dynamic switching between two uplink carriers or two uplink bands is conducted. The DL interruption requirement is specified in clause 8.2.2.2.10 of TS 38.133.