Tài liệu QoS Control in 3G UMTS (final) docx

End user requirement for QoS - Only the QoS perceived by end-user matter - The number of user defined parameters has to be as small as possible - Definition of QoS attributes from the ap

QoS Control in 3G UMTS

I Overview of QoS in general

II Requirements in UMTS

III QoS structure in UMTS

IV Control mechanisms

V Conclusion

II Requirement in UMTS

The requirements for UMTS QoS are devided into three categories:

- End user requirement

- General requirement

- Technical requirement

II Requirement in UMTS

1 End user requirement for QoS

- Only the QoS perceived by end-user matter

- The number of user defined parameters has to be as small as possible

- Definition of QoS attributes from the application requirements has to be simple

- QoS attributes must be able to support all application

- QoS has to be provide end-to-end

III Requirement in UMTS

2 General requirements for QoS

- QoS mechanism have to allow efficient use of radio capacity

- Allow independent evolution of Core and Access

II Requirement in UMTS

3 Technical requirement for QoS

- The UMTS QoS mechanisms shall provide a mapping between application requirements and UMTS services

- The UMTS QoS control mechanisms shall be able to efficiently interwork with current QoS schemes

- QoS shall support efficient resource utilisation

- The QoS parameters are needed to support asymmetric bearers

- QoS behaviour should be dynamic , i.e., it shall be possible to modify QoS parameters during an active session

III QoS structure in UMTS

III QoS structure in UMTS

- Conversational pattern (stringent and low delay)

• Examples: Voice, videotelephon, video conferencing tools

III QoS structure in UMTS

1 2 Streaming Class

• The class intends to support applications

which are not real time but sensitive to jitter

• Features: Preserve time relation between

information entities of the stream

• Examples: Video downloading, news stream,

streaming video, webradio…

III QoS structure in UMTS

1.3. Interactive class

• The class supports non real-time services and application

• Features:

- Request response pattern

- Preserve payload content

• Examples: Web browsing, interactive web,

database retrieval…

III QoS structure in UMTS

- Preserve payload content

• Examples: Background delivery of mails, files, SMS…

III QoS structure in UMTS

2 UMTS QoS parameters/attributes

There are many QoS parameters/attributes defined for UMTS:

• Maximum bitrate

The maximum number of bits delivered by UMTS and to UMTS within a period of time

• Guaranteed bitrate

The guaranteed number of bits delivered by UMTS

within a period of time

III QoS structure in UMTS

To indicate whether the UMTS bearer shall

provide in-sequence SDU delivery or not

• Maximum SDU (Service Data Unit)size (octets)

The maximum size of SDUs

• SDU format information (bits)

A list of possible exact sizes of SDUs

III QoS structure in UMTS

• SDU error ratio

To indicate the fraction of SDUs lost or detected as erroneous

• Residual bit error ratio

To indicate the undetected bit error ratio in the

delivered SDUs

• Delivery of erroneous SDUs (y/n/-)

To indicate whether SDUs detected as erroneous shall

be delivered or discarded or not

III QoS structure in UMTS

• Transfer delay (ms)

To indicate maximum delay for 95th percentile of the distribution of delay for all delivered SDUs

during the lifetime of a bearer service

• Traffic handling priority

To specify the relative importance for handling of all SDUs belonging to the UMTS bearer compared

to the SDUs of other bearers

III QoS structure in UMTS

• Allocation/Retention Priority

To specify the relative importance compared to other UMTS bearers for allocation and retention of the UMTS bearer

• Source statistics descriptor (‘speech’/’unknown’)

To specify characteristics of the source of submitted SDUs

• Signaling Indication (Yes/No)

To indicate the signaling nature of the submitted SDUs

IV Control mechanisms

IV Control mechanisms

Translation functions (Trans.)

Convert between external service signalling and internal service primitives including the translation

of the service attributes

IV Control mechanisms

UMTS BS manager

- Signal between each other and via the

translation function with external instances to

establish or modify a UMTS bearer service

- Interrogates its associated admission/capability control whether the network entity supports the

specific requested service and whether the required resources are available

IV Control mechanisms

The RAB manager

- Verifies with its admission/capability control whether the RAN supports the specific requested service and

whether the required resources are available.

- Translates the RAB service attributes into radio bearer service and RAN Access bearer service attributes and

requests the radio BS manager and the RAN Access BS

manager to provide bearer services with the required

attributes.

IV Control mechanisms

Radio, RAN Access and CN BS

Managers use services provided by lower layers

V Conclusion

• 3G provides benefits to both the end users and

service providers with advantages of both

THANK YOU

Have a nice week!