Влияние общества на человека
Приготовление дезинфицирующих растворов различной концентрации
Практические работы по географии для 6 класса
Организация работы процедурного кабинета
Обработка изделий медицинского назначения многократного применения
Изменения в неживой природе осенью
Уборка процедурного кабинета
Сольфеджио. Все правила по сольфеджио
Балочные системы. Определение реакций опор и моментов защемления
Delayed TBF (GERAN improvements 4)
⇐ ПредыдущаяСтр 8 из 8
UID:2324 and 2325
References for WI " GERAN improvements 4 (Delayed TBF) "
GPRS RLC/MAC procedures were designed for non real-time data transfer where the data arrives as one large block. However, the true nature of packet traffic is usually different from this assumption. Typically there is a considerable amount of interactive message exchange between client and the server before the actual data transfer may begin and even during the data transfer. For example in the IMAP email protocol (commonly used to access mail server) the client generates a lot of requests to the server and typically the next request is sent only after receiving response for the previous request. This kind of a behaviour, which is common for many applications, leads to a high number of Temporary Block Flow (TBF) establishments and releases. The current procedures for establishment and releases were felt not sufficient; consequently, the resource utilization would be far from optimal, transmission delays unnecessary long and the load on the common control channels increased. This feature solves the problem of frequent TBF establishments and improve (E)GPRS Release 4 performance by:
1. Enhancing the RLC/MAC behavior in case of typical IP applications (e.g. e-mail, HTTP, FTP);
2. Reducing the number of TBF establishments caused by interactive client-server message exchange; this would in turn reduce the delay in signalling and data transfer;
3. Reducing the load on common control channels.
The following Stage 3 changes were included in 44.060:
· Definition of enhanced countdown procedure
· Definition of enhanced TBF release procedure
· Definition of USF=FREE type polling mechanism on PDCH
Note that the mobile station shall support in Release 4 the "extended uplink Temporary Block Flow (TBF)" mode (as part of the GERAN Feature Package 1).
In extended uplink TBF mode, the uplink TBF may be maintained during temporary inactive periods, where the mobile station has no Radio Link Control (RLC) information to send. The network determines the release of the uplink TBF.
8.1 Rel-4 Charging and OAM&P
References for WI "Rel-4 Charging and OAM&P"
The objective of Release 4 Charging and OAM&P (Operation, Administration, Maintenance and Provisioning, also called OAM) is to continue progressing the framework to be followed by all 3GPP TSGs and WGs dealing with 3G Systems' Telecom Management (e.g. SA5, RAN O&M, GERAN O&M, etc.).
OAM and Charging both provide interfaces, with appropriate functions, to operators’ Operational Support Systems (OSS) and back-office systems for the purpose of planning, provisioning and monitoring of services, subscribers and network entities as well as charging and billing.
The figure below shows the relationship between the OSS and the monitored components, which are the elements of the “3GPP Network”: the terminals (T), the Radio Access Network (RAN), the GSM EDGE RAN (GERAN) and the Core Network (CN). The aim of this feature is to have OAM&P and Charging interfaces as common as possible.
Overview of OAM and Charging: Domain and Flows
Последнее изменение этой страницы: 2016-04-19; Нарушение авторского права страницы
infopedia.su Все материалы представленные на сайте исключительно с целью ознакомления читателями и не преследуют коммерческих целей или нарушение авторских прав. Обратная связь - 188.8.131.52 (0.011 с.)