From the 4th LTE North America Conference, 8 - 9 November 2011, Dallas, Texas, USA
Presented by Bill Ingram, Cricket Communications, November 8, 2011
Saturday, 26 November 2011
LTE Capacity Analysis
From the 4th LTE North America Conference, 8 - 9 November 2011, Dallas, Texas, USA
Presented by Bill Ingram, Cricket Communications, November 8, 2011
Friday, 25 November 2011
De-risking the Broadband Business Model
Outlook 2012: De-risking the Broadband Business Model
View more presentations from Kim Kyllesbech Larsen
Wednesday, 23 November 2011
Secure Wi-Fi for Large Scale Events and Arenas
Interesting presentation from Logica on Secure WiFi. The resolution of this presentation is low for security reasons as well, I guess.
To download this presentation and other presentation from the recent event, click here.
To download this presentation and other presentation from the recent event, click here.
Monday, 21 November 2011
HSDPA multiflow data transmission
From RP-111375:
HSPA based mobile internet offerings are becoming very popular and data usage is increasing rapidly. As a result, HSPA has begun to be deployed on more than one transmit antenna and/or on more than one carrier. As an example, the single cell downlink MIMO (MIMO-Physical layer) feature was introduced in Release 7. This feature allowed a NodeB to transmit two transport blocks to a single UE from the same cell on a pair of transmit antennas thus improving data rates at high geometries and providing a beamforming advantage to the UE in low geometry conditions. Subsequently, in Release-8 and Release-9, the dual cell HSDPA (DC-HSDPA) and dual band DC-HSDPA features were introduced. Both these features allow the NodeB to serve one or more users by simultaneous operation of HSDPA on two different carrier frequencies in two geographically overlapping cells, thus improving the user experience across the entire cell coverage area.
When a UE falls into the softer or soft handover coverage region of two cells on the same carrier frequency, the link from the serving HS-DSCH cell is capacity or coverage limited and the non-serving cell in its active set has available resources, it would be beneficial to schedule packets to this UE also from the non-serving cell and thereby improve this particular user’s experience.
From 4G Americas whitepaper:
One family of such schemes parses the incoming data for the user into multiple (restricted to two cells in the study) data streams or flows, each of which is transmitted from a different cell [8] Concurrent transmission of data from the two cells may either be permitted or the UE may be restricted to receiving data from only one cell during a given TTI. The former type of scheme is designated an aggregation scheme while the latter is termed a switching scheme. The aggregation scheme can be seen as subsuming the switching scheme at the network when scheduling to the user is restricted to the cell with better channel quality.
Figure 14 illustrates the basic multi-flow concept with both cells operating on the same carrier frequency F1.
3GPP studied different multipoint transmission options for HSDPA and documented the findings and performance gains in TR25.872 providing feasibility and performance justification for the specification work.
For more details also see:
http://www.3gpp.org/ftp/Specs/html-info/FeatureOrStudyItemFile-530034.htm
See also old blog post on Multipoint HSDPA/HSPA here.
Sunday, 20 November 2011
Friday, 18 November 2011
Interoperability between LTE FDD/TDD network
In countries where FDD and TDD are both in use, it would be interesting to see Dual-mode LTE terminals that would support both TDD and FDD and it should be possible to do a reselection as well has handovers from one mode to another.
If you are wondering why we need both FDD and TDD modes in the same geographical location, its because of Spectrum being available as well as with TDD allows possibility of different UL/DL data rates which generally means more efficient use of spectrum.
Thursday, 17 November 2011
Shared Data plans anyone?
Shared plans are common in business tariffs but for some reason operators are reluctant to offer them on personal plans. With multiple devices becoming a common place, I would rather prefer to have a single plan that can be used across multiple devices rather than paying for a plan for each device.
From operator point of view, I think they would get a higher loyalty rate if they allow this as it means that if you want to change an operator, you would have to change SIM from multiple devices and some of these devices may be locked to an operator or may not work on other operators, etc.
An Infonetics Research report is embedded below:
From operator point of view, I think they would get a higher loyalty rate if they allow this as it means that if you want to change an operator, you would have to change SIM from multiple devices and some of these devices may be locked to an operator or may not work on other operators, etc.
An Infonetics Research report is embedded below:
Wednesday, 16 November 2011
Monday, 14 November 2011
Overcapacity or Capacity Crunch?
A Qualcomm presentation from not too long back:
And another report from the UMTS Forum that is suggesting that the data traffic will grow 67 times from 2010 to 2020, summary embedded below:Then I came across this interesting discussion on Twitter and a blog post by Dean Bubley in Disruptive Wireless blog.
Overcapacity has been summarised in few words as: Overcooked forecasts + WiFi offload + optimisation + LTE + more spectrum + caps/tiers + well-designed apps
In the blog post Dean's mentioned about the falling data usage that has been reported by O2. I would strongly recommend reading it.
From the network point of view, I think overcapacity is better for the time being as we are prepared for the short term future. In the long run, new devices and innovative apps may suddenly start driving up the data demand again and hopefully by that time we have sorted out some more of the capacity crunch issues.
What do you think?
Subscribe to:
Posts (Atom)
