HSPA+ Downlink 16M+ is a feature that enables subscribers to experience new applications and high-speed access services. This feature allows the SGSN to provide a maximum of 32 Mbit/s downlink service rate for UEs.

Benefits

 Table 1 Benefits of this feature

For...	Benefits
Carriers	This feature enables carriers to provide higher bandwidth for downlink data services, improving their service competitiveness.
Subscriber	This feature enables subscribers to enjoy high-speed access services.

Requirements

NEs Involved

 Table 2 NEs involved in this feature

UE	BSC	RNC	SGSN	GGSN	HLR
√	-	√	√	√	√

http://localhost:7904/pages/31185560/15/31185560/15/resources/public_sys-resources/icon-note.gif NOTE:

In Table 2, "√" indicates that the NE is required, and "-" indicates that the NE is not required.

 Table 3 NE functions

NE	Function
UE	Sends the requested QoS parameters to the SGSN.
RNC	Transmits data for the UE according to the negotiated QoS parameters.
GGSN	Works with the SGSN to complete the QoS negotiation. Transmits data for the UE according to the negotiated QoS parameters.
SGSN	Negotiates QoS parameters for the UE according to the UE request, subscription data, and license information, and informs the NEs involved of the negotiated QoS parameters. Transmits data for the UE according to the negotiated QoS parameters.
HLR	Configures subscribed QoS parameters.

Supporting Versions

 Table 4 USN9810 versions that support this feature

Product	Supporting Version
USN9810	V900R011C00 and later

License Requirement

This is an optional feature of the USN9810; the license control item is HSPA+ Downlink 16M+.

Interaction with Other Features

WSFD-110903 HSDPA Expansion 2, 8M-16M must be enabled for the HSPA+ Downlink 16M+ feature.

Application Scenario

The USN9810 determines whether to restrict the requested downlink bandwidth according to the setting of the license control item HSPA+ Downlink 16M+ after a subscriber is activated.

Implementation Principles

This section contains the following contents:

• Introduction to HSPA+
• QoS Rates
• Process of Negotiating the QoS Parameters
• Parameter Description
• Feature Measurement Counters

Introduction to HSPA+

The HSPA+ Downlink 16M+ feature is an HSPA+ service. HSPA+ was introduced in the 3rd Generation Partnership Project (3GPP) Release 7, and is a later version of HSPA. It is an enhanced technology based on wideband code division multiple access (WCDMA) of 3GPP Release 5.

HSDPA is implemented mainly on the universal terrestrial radio access network (UTRAN). The core network must be capable of processing QoS parameters during signaling message processing and assign sufficient bandwidth to UEs.

QoS Rates

The QoS parameters, including the bit rate and error rate, are used to determine the QoS that can be provided for subscribers. The QoS parameters of a subscriber are indicated in the subscription information. For each service request of the subscriber, the actual QoS parameters are negotiated based on the resource usage among the UE, UTRAN, SGSN, and GGSN.

Table 5 lists the QoS parameters that are related to rate control.

 Table 5 QoS parameters related to rate control

QoS Parameter	Incorporated Version	Description
Maximum uplink bit rate	3GPP R99	Basic rate parameter
Guaranteed uplink bit rate
Maximum downlink bit rate
Guaranteed downlink bit rate
Maximum downlink extended bit rate	3GPP R5	Introduced for HSDPA
Guaranteed downlink extended bit rate
Maximum uplink extended bit rate	3GPP R7	Introduced for HSPA+
Guaranteed uplink extended bit rate

If HSDPA-related license is not loaded, the SGSN assigns a maximum of 2 Mbit/s service rate to each UE. If HSDPA-related license is loaded, the SGSN assigns the maximum service rate defined in the license to each UE. The maximum service rate depends on the wireless technology. Table 6 lists the service rates on the radio network in different 3GPP releases.

 Table 6 Service rates on the radio network in different 3GPP releases

3GPP Release	MBR on the Radio Network
	Maximum Uplink Bit Rate	Maximum Downlink Bit Rate
3GPP R5	64 kbit/s	14.4 Mbit/s
3GPP R6	5.76 Mbit/s	14.4 Mbit/s
3GPP R7	11 Mbit/s	28 Mbit/s

Process of Negotiating the QoS Parameters

During the procedures such as activation and handover, the QoS parameters must be negotiated between the UE and other NEs. Figure 1 shows the negotiation process for the QoS parameters during the activation procedure.

Figure 1 Process of negotiating the QoS parameters
http://localhost:7904/pages/31185560/15/31185560/15/resources/figure/sgsn/cn_10_23_00035165_fig01.png

The QoS parameters are negotiated as follows during the activation procedure:

1. The UE sends the SGSN an Activate PDP Context Request message carrying the requested QoS parameter.
2. The SGSN sends a Create PDP Context Request message to the GGSN. The message carries the QoS parameter that is negotiated based on the subscribed QoS parameter and default QoS parameter and the requested QOS parameters of UE carried.
3. The GGSN returns a Create PDP Context Response message to the SGSN. The message carries the QoS parameter that has been adjusted by the GGSN.
4. The SGSN negotiates the final QoS parameter with the UTRAN through the Radio Access Bearer Setup procedure.
5. If the final QoS parameter negotiated between the SGSN and the UTRAN is not the QoS parameter that has been adjusted by the GGSN, the SGSN sends the GGSN an Update PDP Context Request message carrying the final QoS parameter.
6. The GGSN returns an Update PDP Context Response message to the SGSN. The message carries the final QoS parameter.
7. The SGSN sends the UE an Activate PDP Context Accept message carrying the final QoS parameter. If the UE does not accept the final QoS parameter, the UE will initiate a deactivation procedure.
   http://localhost:7904/pages/31185560/15/31185560/15/resources/public_sys-resources/icon-note.gif NOTE:

   Before activating the HSPA+ Downlink 16M+ feature, check whether the RNC supports RAB negotiation.

Parameter Description

 Table 7 Parameters

Category	Parameter	Command
Default QoS rates of the SGSN	SUBRANGE=Subscriber Range	MOD IMSISMCHAR
	NTYPE=Negotiation type
	QOS3G=Configure 3G QoS
Default QoS rates of a specific subscriber	MBRDNLK3G=Maximum bit rate for downlink of 3G QoS	ADD IMSISMCHAR
	GBRDNLK3G=Guaranteed bit rate for downlink of 3G QoS
	MBRDNLKEX3G=Extended Maximum bit rate for downlink of 3G QoS
	GBRDNLKEX3G=Extended Guaranteed bit rate for downlink of 3G QoS
QoS protocol versions of the NEs	RNCVER=RNC protocol version	ADD RNC
	QOSVER=QoS version in SGSN	ADD SGSNCHARACT
	QOSVER=QoS version in GGSN	ADD GGSNCHARACT

Feature Measurement Counters

 Table 8 Measurement counters

Measurement Unit	Measurement Counter
Iu mode radio resource	HSPA+ Downlink 16M+ users

Charging and CDR

The length of the QoS field in the charging data record (CDR) varies with actual conditions.

Feature Specifications

 Table 9 Specifications of this feature

Item	Specifications
Maximum uplink bit rate (Mbit/s)	32

Standards Compliance

This feature complies with the following standards:

• 3GPP TS 24.008: "Mobile radio interface Layer 3 specification"
• 3GPP TS 25.413: "UTRAN Iu interface RANAP signaling"
• 3GPP TS 29.002: "Mobile Application Part (MAP) specification"
• 3GPP TS 29.060: "GPRS Tunneling Protocol (GTP) across the Gn and Gp interface"

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