Looking Beyond HSPA+: Keeping up with the Joneses
Signals Research Group, LLC, March 2011, Pages: 18
Looking beyond HSPA+: Keeping up with the Joneses: A look at the evolution of HSPA+ through Release 11 and beyond
The report begins by discussing many of the implications associated with a more advanced HSPA+ technology, including the timing and magnitude of LTE network rollouts and its subsequent impact on the vendor ecosystem, the impact on the user experience, and vendor market share. Next, the report analyzes many of the proposed features that are still being considered within 3GPP for HSPA+, the likelihood that they will be adopted, the timing of when they might be introduced, and their potential impact on network performance.
These features include some well-advertised proposals, such as 8-carrier HSPA, 4x4 MIMO, CLTD (Closed Loop Transmit Diversity) and 2x2 MIMO in the uplink, as well as more arcane features, such as Multi-point HSDPA (MP-HSDPA), which can substantially improve user data rates at the edge of the cell/sector as well as meaningfully increase network throughput under certain conditions. Other proposed features can go a long ways toward reducing the burden of smartphone signaling and greatly reduce the call setup time before the data session commences.
When all is said and done, the publisher concludes that LTE still has certain advantages over HSPA+, namely lower latency and a more effective means of controlling interference in a heterogeneous network. It also doesn't have to deal with potential performance issues associated with legacy devices when introducing new features. However, the widely-held belief that LTE is drastically superior to HSPA+ doesn't hold true unless you erroneously compare the potential performance of a mature LTE/LTE-Advanced network with a non-optimized legacy HSPA network.
- Looking beyond HSPA+: Keeping up with the Joneses
- HSPA+ Release 11 and Beyond
- Why it Matters
- The Timing of LTE
- IPR
- Market Growth and Share
- An Improved User Experience
- Meeting the Demand for Mobile Data Traffic Growth
- Multipoint HSDPA
- HS-DDTX
- SFDC-HSDPA
- HS-SFN
- Fast Cell Switching
- A Likely Outcome
- Enhancing Enhanced CELL_FACH
- Improved Throughput Efficiency
- Improved Network Efficiency and Load Balancing
- Extended Battery Life
- Reduced Latency
- Reduced Signaling
- Closed Loop Beamforming and Uplink MIMO
- Downlink 4x4 MIMO
- 8-Carrier HSDPA
- Multi-RAT HSDPA
- Multi-user MIMO
- Improvements to Heterogeneous Networks
- Final Thoughts
Index of Figures
Figure 1. Potential HSDPA Release 11 Schedule
Figure 2. Single Frequency Dual Carrier HSDPA in Action
Figure 3. User Burst Rate Gain as a Function of Cell Geometry – VA3 Fading with 3 Users
Figure 4. Add-on Features Provide Further Gains at the Cell Edge
Figure 5. Fast Cell Switching Performance Gains as a Function of the Number of Users – PA3 Fading
Figure 6. Proposed New RRC State Transition Changes
Figure 7. The Performance Benefits of CLBF – total cell throughput and 10th percentile end user data rates
Figure 8. Average User Throughput CDF Plot – 1 carrier, 4 carrier, and 8 carrier scenarios (FTP Bursty Traffic Model)
Figure 9. Average Packet Throughput and Packet Call Delay – 1 carrier, 4 carrier, and 8 carrier scenarios (FTP Bursty Traffic Model)
Figure 10. Average Packet and Cell Throughput – 1 carrier, 4 carrier and 8 carrier scenarios (NGMN Bursty Traffic Model)
Figure 11. Multi-RAT HSDPA in Action
Figure 12. MU-MIMO in Action
Index of Tables
Table 1. Proposed HSPA+ Release 11 Features
Table 2. Burst Rate Gains – VA3 and PA3 Fading
Table 3. DC-HSDPA Frequency Band Combinations as Defined in Release 9 and 10
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