Defining the Innovation Band and Shared Spectrum Access

3.5 GHz Shared Spectrum RulesSpectrum sharing rules for the 3.5 GHz band in the US are beginning to take shape. While there are still some important aspects to define, the broad lines have been drawn for the Citizens Broadband Radio Service (CBRS). The process of fine-tuning the rules will continue following the April Further Notice of Proposed Rulemaking (FNPRM) (comments are due July 14th and reply comments by August 1st). The proposed rules will have a three-tiered spectrum sharing scheme in 3550 – 3650 MHz between Incumbent Access, Priority Access License (PAL) and General Authorized Access (GAA) users. Furthermore, there door is open to roll into this band the 3650 – 3700 MHz band which today operates on a non-exclusive licensed basis. Read more of this post

Advertisements

From LTE-U to LTE-DSA: Solving The Capacity Crunch

LTE-UThe proposal by Qualcomm to enable LTE operation in unlicensed band (LTE-U) received a warm response from some (e.g. Ericsson, Verizon) and not so warm from others especially incumbents with strong legacy in Wi-Fi in both the vendor and operator communities. The contentious issue center on co-existence of LTE and Wi-Fi in the same band as Wi-Fi implements ‘listen before talk’ or in technical terms carrier sense multiple access (CSMA) as opposed to LTE where transmissions are scheduled by the base station. This issue plagued WiMAX in unlicensed bands and was topic of much work at the IEEE during standardization activities of that technology. Still, while the proposal is not yet an approved work item for 3GPP LTE Release 13, the next few weeks will most likely see this feature approved to include in the standard with completion timelines by end of 1Q 2016, when we very possibly can see actual systems deployed. Read more of this post

Carrier Aggregation and the Road to Cognitive Radio and Superwide Spectrum

Carrier AggregationOften, the least hyped technologies are the most effective, get the widest adoption, and have the greatest impact. Carrier aggregation is one such technology that I don’t think it received its fair share of attention. LTE did bring a number of new features that were not available in 3G, such as MIMO. But MIMO was already deployed in other technologies including both Wi-Fi and WiMAX. Carrier aggregation on the other hand developed by the requirement to achieve higher data rates in LTE network. True channel bonding is a feature of Wi-Fi, but it applies to adjacent channels. Carrier aggregation on the other hand combines distinct channels in different bands. From that perspective, I am not aware of any wireless technology that has implemented carrier aggregation. Read more of this post