- Language: English
- 110 Pages
- Published: June 2013
- Region: Italy
LTE-Advanced HetNet: Market Outlook and Technology Implications
- Published: May 2011
- Region: Global
- 13 Pages
- Signals Research Group, LLC
Market outlook and technology implications for LTE-Advanced Heterogeneous Networks (HetNet)
Even under the most optimistic set of assumptions, the publisher demonstrates that by 2020 at least 25% of the mobile data traffic in North America will have to be offloaded from the traditional macro network. Similar results are likely in other markets. This result assumes that an additional 500MHz of new spectrum becomes available in the next several years. If the publisher uses assumptions that are more consistent with industry consensus (e.g., mobile data growth) then the percentage is substantially higher, to the point that it reaches nosebleed levels. Further, the industry cannot afford to sit back and wait since in many scenarios there a double-digit percentage of the mobile data traffic must be offloaded as early as 2015.
Something must be done in order to address this dramatic growth of mobile data traffic. Network optimization, advanced cellular technologies (e.g., LTE), and data compression algorithms help, but they may not be enough on their own. Instead, operators will need to offload capacity from their macrocells onto smaller cells. Enter HetNet.
In this issue of Signals Ahead the publisher provides a detailed technical analysis of Heterogeneous Networks, including several “modeling perspectives” which demonstrate the clear need for macrocell capacity offload solutions. Specific topics include the following:
The Outlook. The publisher provide a series of analytical exercises, along with sound reasoning and sensitivity scenarios, which demonstrate the importance of macro network offload. They show, for example, that even under the most optimistic set of assumptions, including the availability of 500MHz of new spectrum in the coming years, at least 25% of the mobile traffic will have to be offloaded from the traditional macro network by 2020. Under most scenarios, the percentage is substantially higher. Further, with most studies a double-digit percentage is required as soon as 2015.
The Definition. Most readers should understand the basic concept of HetNet, but for those readers who are still coming up to speed the publisher provides a good primer.
The Challenges. When small/low-power cells are deployed in a network consisting of large/high-power cells, problems inevitably occur. These new cells, after all, are nothing more than new sources of interference unless they are used effectively and efficiently. In some cases, in particular with pre-Release 10 devices, the mobile device may not even detect the presence of these new cells, thus defeating their intended purpose.
The Solutions. The beauty of LTE is that it divides the data and traffic channels into discrete partitions in the frequency and time domains. This feature can be leveraged to minimize interference and to maximize the combination of macrocells, picocells, and eventually femtocells. New technology enablers, including ABS (Almost Blank Sub-frame) and advanced receiver architectures which support interference cancellation are only part of the story. The publisher discusses.
The Status. The publisher discuss when HetNet will become a reality. Fortunately, it appears to be sooner rather than later SHOW LESS READ MORE >
HetNet: When big cells and small cells collide
- The Basics
Macro Network Capacity Offload Forecast (The publisher's perspective)
- Sensitivity Analysis
- Spectral Efficiency Gains per Amount of Used Spectrum and its Impact on the Results
- The Amount of Utilized Spectrum in 2010 and its Impact on the Results
- Downlink Interference from a CSG Femtocell
- Uplink Interference from a Macro UE near a CSG Femtocell
- Locating and Attaching to the Pico/Femtocell
- An Imbalanced Network Load
- High Mobility Devices Moving in and out of a Picocell/Femtocell Coverage Area
- The Backhaul
- Inter-Cell Interference Coordination (ICIC)
- Enhanced Inter-Cell Interference Coordination (eICIC)
- Almost Blank Subframes (ABS)
- Range Expansion
- Legacy 3G Technologies
- An Alternative Use for 3.xGHz Spectrum
Index of Figures
Figure 1. Homogeneous versus Heterogeneous Network Topologies
Figure 2. Mobile Data Traffic Growth Perspectives (2010-2020)
Figure 3. The Impact of Varying Spectrum Efficiency Gains on the Amount of Macro Network Traffic that is Offloaded – 2015 and 2020
Figure 4. The Impact of Varying the Amount of Spectrum Used to Carry Mobile Data Traffic in 2010 on the Amount of Macro Network Traffic that is Offloaded – 2015 and 2020
Index of Tables
Table 1. Mobile Data Traffic Growth Assumptions (2010-2020)
Table 2. The Supply versus Demand Imbalance – Assumptions and Results
Table 3. The Impact of Varying Spectrum Efficiency Gains on the Amount of Macro Network Traffic that is Offloaded – 2015 and 2020
Table 4. The Impact of Varying the Amount of Spectrum Used to Carry Mobile Data Traffic in 2010 on the Amount of Macro Network Traffic that is Offloaded – 2015 and 2020