3GPP Broadband Evolution to IMT-Advanced - 4G Americas

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channel, which causes delays. Overcoming these delays can be done by transmitting dataon the E-DCH while still in the CELL_FACH state. Data transmissions can thus continueuninterrupted as the state changes from CELL_FACH to CEL_DCH. 109Figure 41 summarizes the capabilities and benefits of the features being deployed inHSPA+.Figure 41: Summary of HSPA Functions and Benefits 110HSPA Voice SupportVoice support with WCDMA-dedicated channels in UMTS networks is spectrally veryefficient. Moreover, current networks support simultaneous voice and data operation.There are, however, reasons to consider alternate approaches including reducing powerconsumption and being able to support even more users. One approach is called circuitswitchedvoice over HSPA. The other is VoIP.Circuit-Switched (CS) Voice over HSPAHSPA channels employ many optimizations to obtain a high degree of data throughput,which is why it makes sense to use them to carry voice communications. Doing so withVoIP, however, requires not only supporting packetized voice in the radio channel, butalso within the infrastructure network. There is an elegant alternative: To packetize thecircuit-switched voice traffic which is already in digital form, use the HSPA channels tocarry the CS voice, but then to connect the CS voice traffic back into the existing CSinfrastructure (MSCs, etc.) immediately beyond the radio access network. This requires109 Source: “3G Evolution: HSPA and LTE for Mobile Broadband,” E. Dahlman, et al, Elsevier, 2008.110 Source: 3G Americas’ member contribution.Transition to 4G: 3GPP Broadband Evolution to IMT-Advanced, Rysavy Research/3G Americas, Aug 2010 Page 96
elatively straightforward changes in just the radio network and in devices. The followingfigure shows the infrastructure changes required at the Node B and within the RNC.Figure 42: Implementation of HSPA CS Voice 111With this approach, legacy mobile phones can continue using WCDMA-dedicated trafficchannels for voice communications, while new devices use HSPA channels. HSPA CS voicecan be deployed with Release 7 or later networks.The many benefits of this approach, listed below, make it highly likely that operators willadopt it:Relatively easy to implement and deploy.Transparent to existing CS infrastructure.Supports both narrowband and wideband codecs.Significantly improves battery life with voice communications.Enables faster call connections.Provides a 50% to 100% capacity gain over current voice implementations.Acts as a stepping stone to VoIP over HSPA/LTE in the future.VoIPOnce HSDPA and HSUPA are available, operators will have another option of movingvoice traffic over to these high-speed data channels, which is using VoIP. This willeventually increase voice capacity, allow operators to consolidate their infrastructure onan IP platform, and enable innovative new applications that combine voice with data111 Source: 3G Americas’ white paper, 2007, “UMTS Evolution from 3GPP Release 7 to Release 8.”Transition to 4G: 3GPP Broadband Evolution to IMT-Advanced, Rysavy Research/3G Americas, Aug 2010 Page 97
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Quality of service (QoS). By priori
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Figure 4: WCDMA-HSPA Voice and Data
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It is clear that both EDGE and UMTS
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TechnologyNameType Characteristics
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Europe are providing operators with
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MHz, in Japan at 1500 MHz and in Eu
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and VoIP operation. These approache
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will be able to build applications
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Leveraging this success, operators
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VoIP for HSPA. Since LTE uses an IP
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Figure 10: Different Deployment Sce
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Figure 11: Radio Resource Managemen
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IEEE 802.16e-2005 and now IEEE 802.
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attempts, no terrestrial wireless-d
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DownlinkPeakNetworkSpeedPeakand/orT
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DownlinkUplinkPeakNetworkSpeedPeaka
Page 45 and 46: Figure 13: HSDPA Performance of a 7
Page 47 and 48: Figure 15: HSPA+ Performance Measur
Page 49 and 50: Figure 17: LTE Throughput in Variou
Page 51 and 52: Figure 19: Latency of Different Tec
Page 53 and 54: Figure 20: Performance Relative to
Page 55 and 56: Figure 21: Comparison of Downlink S
Page 57 and 58: Incremental redundancy in error cor
Page 59 and 60: Figure 23: Comparison of Voice Spec
Page 61 and 62: Figure 24: Relative Volume of Subsc
Page 63 and 64: Technology EDGE/HSPA/LTE CDMA2000 W
Page 65 and 66: capacity of OFDMA-based approaches
Page 67 and 68: In this section, we consider differ
Page 69 and 70: To understand the evolution of data
Page 71 and 72: how EDGE functions including networ
Page 73 and 74: Alternatively, the original number
Page 75 and 76: In today’s EDGE systems, f12 thro
Page 77 and 78: DAS-9 16 QAM 217.6DAS-10 32 QAM 262
Page 79 and 80: Operators can also use their entire
Page 81 and 82: HSDPAHSPA refers to networks that s
Page 83 and 84: Figure 33: User DiversitySignal Qua
Page 85 and 86: Initial devices enabled peak user r
Page 87 and 88: “single-stream MIMO” or “MIMO
Page 89 and 90: Given the large amount of backhaul
Page 91 and 92: connection between the network and
Page 93 and 94: Figure 39: HSPA One-Tunnel Architec
Page 95: Figure 40: High-Speed Forward Acces
Page 99 and 100: on LTE began in 2004 with an offici
Page 101 and 102: Figure 45: LTE OFDMA Downlink Resou
Page 103 and 104: Single base-station antenna versus
Page 105 and 106: TX antennas and most devices will o
Page 107 and 108: Figure 48: Evolution of Voice in an
Page 109 and 110: Table 19: IMT-Advanced Requirements
Page 111 and 112: Beyond wider bandwidths, LTE-Advanc
Page 113 and 114: As discussed in more detail in the
Page 115 and 116: Different technologies spanning Wi-
Page 117 and 118: stations, and because of the narrow
Page 119 and 120: Support for new radio-access networ
Page 121 and 122: AbbreviationsThe following abbrevia
Page 123 and 124: GBR - Guaranteed Bit RateGbyte - Gi
Page 125 and 126: PHY - Physical LayerPMI - Precoding
Page 127 and 128: Additional Information3G Americas m
Page 129 and 130: Ericsson: HSPA voice migration, Jun
Page 131 and 132: SNL Kagan: press release, “SNL Ka
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3GPP Broadband Evolution to IMT-Advanced - 4G Americas

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