#Параметры качества QoS сети 5G NR

Представлена информация о параметрах качества QoS сети 5G NR. В зависимости от того какой именно тип сервиса с какими требования запрашивает пользователь, сеть 5G NR автоматически назначает для каждого пользовательского сервиса идентификатор 5QI (5G QoS Identifier) с требуемым качеством сервиса (QoS, Quality of Service) и перестраивает технические параметры сети 5G с целью выполнения требования каждого назначенного 5QI.

Модель QoS сети 5G основана на QoS Flows (подробности описаны в 3GPP TS 23.501) и поддерживает как GBR (guaranteed flow bit rate, гарантированную скорость) так и Non-GBR (do not guaranteed flow bit rate,  не гарантированную скорость).

На рисунке ниже представлена архитектура QoS сети 5G NR согласно 3GPP 38.300.

5G NR QoS architecture

Для каждого QoS flow назначаются:

  • 5G QoS Identifier (5QI);
  • приоритетность потока (An Allocation and Retention Priority, ARP);

      для GBR QoS flow :

  • гарантированная скорость (Guaranteed Flow Bit Rate, GFBR) для DL и UL;
  • максимальная скорость (Maximum Flow Bit Rate, MFBR) для DL и UL;
  • максимальный процент потерянных пакетов данных (Maximum Packet Loss Rate) для DL и UL;

      для Non-GBR QoS:

  • атрибут «отраженного» QoS (Reflective QoS Attribute. RQA):

Требования предъявляемые к качественным характеристиками QoS сети, каждого назначенного 5QI строго регламентируется в рамках 3GPP TS 23.501 и представлены в таблице

5QI

Value

Resource Type

Default Priority Level

Packet Delay Budget

Packet Error

Rate

Default Maximum Data Burst Volume

(NOTE 2)

Default

Averaging Window

Example Services

1

GBR

(NOTE 1)

20

100 ms

(NOTE 11,

NOTE 13)

10-2

N/A

2000 ms

Conversational Voice

2

40

150 ms

(NOTE 11,

NOTE 13)

10-3

N/A

2000 ms

Conversational Video (Live Streaming)

3

(NOTE 14)

30

50 ms

(NOTE 11,

NOTE 13)

10-3

N/A

2000 ms

Real Time Gaming, V2X messages

Electricity distribution – medium voltage, Process automation — monitoring

4

50

300 ms

(NOTE 11,

NOTE 13)

10-6

N/A

2000 ms

Non-Conversational Video (Buffered Streaming)

65

(NOTE 9,

NOTE 12)

7

75 ms

(NOTE 7, NOTE 8)

10-2

N/A

2000 ms

Mission Critical user plane Push To Talk voice (e.g., MCPTT)

66

(NOTE 12)

20

100 ms

(NOTE 10,

NOTE 13)

10-2

N/A

2000 ms

Non-Mission-Critical user plane Push To Talk voice

67

(NOTE 12)

15

100 ms

(NOTE 10,

NOTE 13)

10-3

N/A

2000 ms

Mission Critical Video user plane

75

(NOTE 14)

5

Non-GBR

(NOTE 1)

10

100 ms

NOTE 10,

NOTE 13)

10-6

N/A

N/A

IMS Signalling

6

60

300 ms

(NOTE 10,

NOTE 13)

10-6

N/A

N/A

Video (Buffered Streaming)
TCP-based (e.g., www, e-mail, chat, ftp, p2p file sharing, progressive video, etc.)

7

70

100 ms

(NOTE 10,

NOTE 13)

10-3

N/A

N/A

Voice,
Video (Live Streaming)
Interactive Gaming

8

80

300 ms

(NOTE 13)

10-6

N/A

N/A

Video (Buffered Streaming)
TCP-based (e.g., www, e-mail, chat, ftp, p2p file sharing, progressive

video, etc.)

9

90

69

(NOTE 9, NOTE 12)

5

60 ms

(NOTE 7, NOTE 8)

10-6

N/A

N/A

Mission Critical delay sensitive signalling (e.g., MC-PTT signalling)

70

(NOTE 12)

55

200 ms

(NOTE 7,

NOTE 10)

10-6

N/A

N/A

Mission Critical Data (e.g. example services are the same as 5QI 6/8/9)

79

65

50 ms

(NOTE 10,

NOTE 13)

10-2

N/A

N/A

V2X messages

80

68

10 ms

(NOTE 5,

NOTE 10)

10-6

N/A

N/A

Low Latency eMBB applications Augmented Reality

82

Delay Critical GBR

19

10 ms
(NOTE 4)

10-4

255 bytes

2000 ms

Discrete Automation (see TS 22.261 [2])

83

22

10 ms
(NOTE 4)

10-4

1354 bytes

(NOTE 3)

2000 ms

Discrete Automation (see TS 22.261 [2])

84

24

30 ms

(NOTE 6)

10-5

1354 bytes

(NOTE 3)

2000 ms

Intelligent transport systems (see TS 22.261 [2])

85

21

5 ms

(NOTE 5)

10-5

255 bytes

2000 ms

Electricity Distribution- high voltage (see TS 22.261 [2])

NOTE 1:    A packet which is delayed more than PDB is not counted as lost, thus not included in the PER.

NOTE 2:    It is required that default MDBV is supported by a PLMN supporting the related 5QIs.

NOTE 3:    This MDBV value is set to 1354 bytes to avoid IP fragmentation for the IPv6 based, IPSec protected GTP tunnel to the 5G-AN node (the value is calculated as in Annex C of TS 23.060 [56] and further reduced by 4 bytes to allow for the usage of a GTP-U extension header).

NOTE 4:    A delay of 1 ms for the delay between a UPF terminating N6 and a 5G-AN should be subtracted from a given PDB to derive the packet delay budget that applies to the radio interface.

NOTE 5:    A delay of 2 ms for the delay between a UPF terminating N6 and a 5G-AN should be subtracted from a given PDB to derive the packet delay budget that applies to the radio interface.

NOTE 6:    A delay of 5 ms for the delay between a UPF terminating N6 and a 5G-AN should be subtracted from a given PDB to derive the packet delay budget that applies to the radio interface.

NOTE 7:    For Mission Critical services, it may be assumed that the UPF terminating N6 is located «close» to the 5G_AN (roughly 10 ms) and is not normally used in a long distance, home routed roaming situation. Hence delay of 10 ms for the delay between a UPF terminating N6 and a 5G_AN should be subtracted from this PDB to derive the packet delay budget that applies to the radio interface.

NOTE 8:    In both RRC Idle and RRC Connected mode, the PDB requirement for these 5QIs can be relaxed (but not to a value greater than 320 ms) for the first packet(s) in a downlink data or signalling burst in order to permit reasonable battery saving (DRX) techniques.

NOTE 9:    It is expected that 5QI-65 and 5QI-69 are used together to provide Mission Critical Push to Talk service (e.g., 5QI-5 is not used for signalling). It is expected that the amount of traffic per UE will be similar or less compared to the IMS signalling.

NOTE 10: In both RRC Idle and RRC Connected mode, the PDB requirement for these 5QIs can be relaxed for the first packet(s) in a downlink data or signalling burst in order to permit battery saving (DRX) techniques.

NOTE 11: In RRC Idle mode, the PDB requirement for these 5QIs can be relaxed for the first packet(s) in a downlink data or signalling burst in order to permit battery saving (DRX) techniques.

NOTE 12: This 5QI value can only be assigned upon request from the network side. The UE and any application running on the UE is not allowed to request this 5QI value.

NOTE 13: A delay of 20 ms for the delay between a UPF terminating N6 and a 5G-AN should be subtracted from a given PDB to derive the packet delay budget that applies to the radio interface.

NOTE 14: This 5QI is not supported as it is only used for transmission of V2X messages over MBMS bearers as defined in TS 23.285 [72].

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