QoS-Adhoc #

Agenda Item: 	End to End QoS 

Source: 	NTT DoCoMo

Title: 	Asymmetric Bearer for Packet Services and actual evolution point to the relating protocols

Document for:	Discussion

1.	 Abstract

In S2-QoS ad-hoc, QoS for UMTS is discussed. This contribution proposes Asymmetric Bearer to be supported for QoS in UMTS and also proposes evolution point to the relating protocols for realizing Asymmetric Bearer.

2.	 The necessity to support asymmetric bearer for UMTS Phase1 ---Discussion

UMTS system will support various types of Multi-media Communications. Most of the multi-media traffics have the nature of the asymmetric communication. According to this point, it is necessary for UMTS system packet services to support asymmetric bearer.

3.	 The actual evolution point for each protocol

To support asymmetric bearer, UMTS system is necessary to know user’s bearer capabilities for both directions individually. On the other hand current GPRS only defines peak throughput and mean throughput, which may be carried on the SM, GTP and MAP messages, as common parameters for both directions.  So UMTS specification needs to define these two parameters as separate parameters for the two directions as evolution point. 

Therefore, it is expected that the format related to QoS in the SM, GTP and MAP should be extended.  

4.	 Proposal

It is proposed that UMTS QoS Technical Report should be modified as follows. To support asymmetric bearer service, it is expected that the format related to QoS in the SM, GTP and MAP should be extended. These evolution points should be notified to CN TSG WG1 and CN TSG WG2.

<modified text>
8.1 End User QoS Requirements

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•	Derivation/definition of QoS attributes from the application requirements has to be simple.

•	QoS attributes must be able to support all applications that are used, a certain number of applications have the characteristic of asymmetric nature between two directional uplink/downlink.

•	QoS definitions have to be future proof.

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8.3 Technical Requirements for QoS

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•	QoS shall support efficient resource utilisation.

•	The QoS parameters are needed to support asymmetric bearer.

•	Applications (or special software in MS or 3G gateway node) should be able to indicate QoS values for their data transmissions.

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10.4 QoS Parameters

10.4.1 General

The parameters related to throughput/bitrate should be separated for uplink/downlink in order to support asymmetric bearer.

10.4.2 UMTS Bearer Service 

10.4.3 Radio Access Bearer Service Parameters

10.4.4 Radio Bearer Service Parameters

10.4.5 Iu Bearer Service Parameters

10.4.6 Gn Bearer Service Parameters