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

QoS Control in 3G UMTS Group members: 1. Nguyễn Thạc Đức SHSV: 20090811 2. Nguyễn Văn Đức 3. Nguyễn Trung Đức 4. Trần Minh Đức 5. Phạm Thị Dung CONTENTS I. Overview of QoS in general II. Requirements in UMTS III.QoS structure in UMTS IV.Control mechanisms V. Conclusion I. Overview of QoS Quality of service (QoS) is the mechanism insuring that a service can be delivered to the end user in an acceptable time-frame and the service properties are stable I. Overview of QoS QoS has three main characteristics as below: - Availability of the service - Quality of information - Consistent delivery I. Overview of QoS At a technical level, QoS is characterized by: - Service availability - Delay - Delay variation (jitter) - Throughput - Packet loss rate 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 network - QoS parameters should not be restricted to one or few external QoS control mechanisms but the QoS concept should be capable of providing different level of QoS by using UMTS specific control mechanisms 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 [...]... lowest priorities • Features: - Destination is not expecting the data within a certain time - 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... number of bits delivered by UMTS within a period of time III QoS structure in UMTS • Delivery order (y/n) 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...III QoS structure in UMTS 1 QoS class 1.1 Conversational Class • The class supports real-time communication between entities • Features: - Preserve time relation (variation) between information entities of the stream - 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... 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 1.4 Background... 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... 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)... 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... Conclusion • 3G provides benefits to both the end users and service providers with advantages of both technologies • However, many challenge issues still exist for the integrated network • QoS guarantee in integrated 3G networks deserves further investigations THANK YOU Have a nice week! ... 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... 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 . Overview of QoS in general II. Requirements in UMTS III .QoS structure in UMTS IV .Control mechanisms V. Conclusion I. Overview of QoS Quality of service (QoS) . providing different level of QoS by using UMTS specific control mechanisms II. Requirement in UMTS 3. Technical requirement for QoS - The UMTS QoS mechanisms