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Articles on this Page
- 01/14/13--10:29: _Public Safety Commu...
- 01/17/13--08:53: _Rel-11/12 3GPP Secu...
- 01/21/13--23:31: _LTE / EPC Signallin...
- 01/23/13--00:31: _LTE-B, LTE-C, ... ,...
- 01/27/13--23:40: _Overview of 3GPP Re...
- 01/31/13--01:01: _Direct Communicatio...
- 02/02/13--05:42: _Ten things Wi-Fi ha...
- 02/05/13--04:30: _Interference avoida...
- 02/06/13--23:30: _The story of Femtoc...
- 02/11/13--00:00: _Revisiting Coordina...
- 02/14/13--00:20: _Scalable UMTS (S-UM...
- 02/17/13--04:11: _M2M Standardization...
- 02/18/13--04:00: _Diameter, Signallin...
- 02/20/13--05:00: _Small cell standard...
- 02/23/13--06:33: _Google Glasses - ta...
- 02/25/13--04:00: _LTE-A: Downlink Tra...
- 02/27/13--04:30: _Wi-Fi & Packet Core...
- 03/03/13--02:29: _Gadgets from Mobile...
- 03/04/13--23:30: _Technologies from M...
- 03/06/13--23:30: _Mobile Service stat...
- 01/14/13--10:29: Public Safety Communications using LTE
- 01/17/13--08:53: Rel-11/12 3GPP Security Update
- Quick update on 3GPP Release-12 progress
- The four C's of Release-12 enhancements
- Quick update on LTE Release 11 Work and Study Items
- 3GPP LTE Security Aspects
- Evolution of 3GPP Security
- 2 Presentations on Mobile technology Security
- 01/21/13--23:31: LTE / EPC Signalling Training from eXplanoTech
- 01/23/13--00:31: LTE-B, LTE-C, ... , LTE-X
- 01/27/13--23:40: Overview of 3GPP Release-12 Study Item UPCON
- Data growth from 0.6EB/Mo to 10.6EB/Mo by 2016 (18x)
- Operators strategy for supporting the ‘Mobile Data Explosion’
- Data v/s Signalling Traffic in Dongles and Phones
- Capacity planning in mobile data networks experiencing exponential growth in demand
- 3GPP based 'Sponsored Data Connectivity'
- Downlink traffic distribution during 27 hours in one GGSN
- A Twitter discussion on 'Data Tsunami' myth
- Mobile Video is more than 50% of the data traffic
- 01/31/13--01:01: Direct Communication in 3GPP Release-12
- 02/02/13--05:42: Ten things Wi-Fi had in common with public toilets!
- 02/05/13--04:30: Interference avoidance for in-device coexistence (IDC)
- 02/06/13--23:30: The story of Femtocells, Small Cells and Metrocells
- 02/11/13--00:00: Revisiting Coordinated Multi-point (CoMP) Technology
- 02/14/13--00:20: Scalable UMTS (S-UMTS) to accelerate GSM Refarming
- 02/17/13--04:11: M2M Standardization and its Role for Emerging Smart Cities
- 02/18/13--04:00: Diameter, Signalling and LTE
- 02/20/13--05:00: Small cell standardization in 3GPP Release 12
- 02/23/13--06:33: Google Glasses - take two
- 02/25/13--04:00: LTE-A: Downlink Transmission Mode 9 (TM-9)
- 02/27/13--04:30: Wi-Fi & Packet Core (EPC) Integration
- 03/03/13--02:29: Gadgets from Mobile World Congress 2013 (#MWC13)
- 03/04/13--23:30: Technologies from Mobile World Congress 2013 (#MWC13)
- 03/06/13--23:30: Mobile Service status and Trends in the USA - 2012
All presentations are available from here to download.
Related blog posts:
By the way, I will also be present in the Network Security conference in London in May 2013
When I saw this picture above, I started wondering what LTE-B, etc. and started digging a bit deep. Came across this Ericsson presentation (embedded below) that shows the breakdown.
To just be sure that this is not Ericsson specific term, I also found a presentation by NTT Docomo (embedded below)
case of 3G/HSPA.
The presentations from Ericsson and NTT Docomo embedded below, available to download from Slideshare.
Here are couple of presentations on this topic:
Related blog posts:
And a magazine article from IEEE on this topic:
If interested in doing more research on this topic, also see this link.
Here is the updated 3GPP document
Femtocells were introduced many years back as a residential, closed group, small base station. The intention was to provide coverage at home for high speed data (primary) and voice (secondary). It was more for coverage than capacity. In these good old days smart phones were far and few and feature phones were many. WiFi on the phone made it expensive and power hungry so cellular was the way to go.
Looks like a good idea from LTE will possibly be applied to UMTS/HSPA and it will also help accelerate the re-farming of GSM spectrum. A recent presentation from Qualcomm below:
Available to download from here.
Related presentation on slideshare here.
So nearly after a year of my Google Glass post, looks like Google is ready to ship some of these glasses to some competition winners for $1500. Even the Facebook founder Mark Zuckerberg is excited and cant wait to get his hands on it.
There is also this new video showing 'How it Feels' wearing Glass and everytime I go back to youtube, the count increases by 100K. Embedded below:
My two main concerns are that I have to speak loudly to the glass which may not be convenient in public places or in front of others and the other being that when many people will have these devices, my Glass may pickup command from another user.
Sometime back there was a discussion on 'Bone conduction audio'. This will allow the user to hear from the Glass without the need of a headphone or speakers, I guess a similar kind of technology is needed in place of a mic. The Glass can sense that the user who is wearing it is talking instead of someone else. It should also solve the need to speak to speak loudly to the Glass.
A new Downlink Control Information (DCI) format - known as format 2C - is used for TM9 data scheduling. Two new reference signals are defined in TM9: Channel State Information Reference Signal (CSI-RS) and Demodulation Reference Signal (DMRS). The first is used from the UE to calculate and report the CSI feedback (CQI/PMI/RI), while the latter is an evolution - providing support for more layers - of the UE specific reference signal that is already used for beamforming in Rel-9, and is used for signal demodulation. TM-9 is particularly smart as it can detect when a mobile device is being used and send a different type of signal that is optimal for a mobile device (variable DM-RS – demodulation reference signals). This maximises the efficient use of the base station and guarantee’s a decent data rate for users.
Early results in SK Telecom press release are positive with a claimed 10-15% increase in data rates in locations where there was known inter-cell interference.
I also looked into couple of books and here is one explanation from An Introduction to LTE by Chris Cox.
To use eight layer spatial multiplexing, the base station starts by configuring the mobile into a new transmission mode, mode 9. This supports both single user and multiple user MIMO, so the base station can quickly switch between the two techniques without the need to change transmission mode.
The base station schedules the mobile using a new DCI format, 2C. In the scheduling command, it specifies the number of layers that it will use for the data transmission, between one and eight. It does not have to specify the precoding matrix, because that is transparent to the mobile. The base station then transmits the PDSCH on antenna ports 7 to 7 + n, where n is the number of layers that the mobile is using. The maximum number of codewords is two, the same as in Release 8.
The mobile still has to feed back a precoding matrix indicator, which signals the discrepancy between the precoding that the base station is transparently providing and the precoding that the mobile would ideally like to use. Instead of using the PMI, however, the mobile feeds back two indices, i1 and i2. Both of these can vary from 0 to 15, which provides more finely-grained feedback than the PMI did and in turn improves the performance of the multiple user MIMO technique. The base station can then use these indices to reconstruct the requested precoding matrix.
Embedded below is an extract from Google books for Lte-Advanced Air Interface Technology By Xincheng Zhang, Xiaojin Zhou
Finally, if you have enough patience, here is Nokia keynote:
Related blog post:
You can read more about this topic here.
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