Ultra Mobile Broadband
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UMB (Ultra Mobile Broadband) is the brand name for the project within 3GPP2 to improve the CDMA2000 mobile phone standard for next generation applications and requirements. The system employs OFDMA technology along with advanced antenna techniques to provide peak rates of up to 280 Mbit/s. Goals for UMB include significantly improving system capacity, greatly increasing user data rates throughout the cell, lowering costs, enhancing existing services, making possible new applications, and making use of new spectrum opportunities. The technology will provide users with concurrent IP-based services in a full mobility environment. The UMB standardization is expected to be completed in mid 2007, with commercialization taking place around mid-2009.
To provide ubiquitous and universal access, UMB supports inter-technology handoffs with other technologies including existing CDMA2000 1X and 1xEV-DO systems.
The name Ultra Mobile Broadband communicates the key attributes of the technology:
Ultra: An ultra fast technology that supports more than an order of magnitude increase in broadband data throughput rates to economically deliver IP-based voice, multimedia, broadband, information technology, entertainment, and consumer electronic services within most kinds of devices
Mobile: A platform that supports several wireless services within a full mobility environment and thus differentiates itself from Wi-Fi, WiMAX, UWB, etc
Broadband: Ultra high-speeds that are in the order of 100s of megabits per second; next-generation capabilities, beyond 3G
Contents |
[edit] UMB Summary
- OFDMA-based air interface
- Frequency Division Duplex
- Scalable bandwidth between 1.25-20 MHz (OFDMA systems are especially well suited for wider bandwidths larger than 5 MHz)
- Supports mixed cell sizes, e.g., macro-cellular, micro-cellular & pico-cellular.
- IP network architecture
- Supports flat, centralized and mixed topologies
- Data speeds over 275 Mbit/s downstream and over 75 Mbit/s upstream
[edit] UMB Key Design Elements
- Significantly higher data rates & reduced latencies using FL advanced antenna techniques
- MIMO, SDMA and Beamforming
- Higher RL sector capacity with quasi-orthogonal reverse link
- Increased cell edge user data rates using adaptive interference management
- Dynamic fractional frequency reuse
- Distributed RL power control based on other cell interference
- Real time services enabled by fast seamless L1/L2 handoffs
- Independent RL & FL handoffs provide better airlink and handoff performance
- Power optimization through use of quick paging and semi-connected state
- Low-overhead signaling using flexible airlink resource management
- Fast access and request using RL CDMA control channels
- New scalable IP architecture supports inter-technology handoffs
- New handoff mechanisms support real-time services throughout the network and across different airlink technologies
- Fast acquisition and efficient multi-carrier operation through use of beacons
- Multi-carrier configuration supports incremental deployment & mix of low-complexity & wideband devices
[edit] UMB Benefits
UMB is intended to be a so-called fourth-generation technology. These technologies use a high bandwidth, low latency, underlying TCP/IP network with high level services such as voice built on top. While no 4G networks have been deployed yet, the much greater amount of bandwidth, and much lower latencies, should enable the use of various application types that have previously been impossible, while continuing to deliver high quality (or higher quality) voice services. The improved bandwidths of the network provided by more efficient technologies may also result in networks with better capacity.
UMB's use of OFDMA eliminates many of the disadvantages of the CDMA technology used by its predecessor, including the "breathing" phenomenon, the difficulty of adding capacity via microcells, and the fixed bandwidth sizes that limit the total bandwidth available to handsets.
[edit] External links
- 3GPP2 Standards and specifications
- CDMA Development Group (CDG)
