Friday, 12 February 2010

M2M will become really big


It seems kind of odd to call a prediction that an industry segment will reach $18.9 billion an understatement, but in this case it may be so.


This week, Juniper Research pegged the mobile and embedded M2M industry at that amount worldwide by 2014. The press release says that consumer and commercial telematics – vehicle-bound M2M -- will represent more than a third of the total.

Nineteen billion dollars is a lot of money. But even that pot of gold pales in comparison to the promise of M2M. M2M covers smart grid, telematics and a mind-boggling number of other consumer and business services and applications. Indeed, the specter of M2M -- thousands of gadgets talking to millions of widgets -- is one of the reasons that Internet Protocol version 6 is being pushed so hard in some quarters.

Another example of the potential size of the market comes from Berg Insight. The firm says the European M2M module market will grow from 2.3 million last year to 22 million in 2014. Systems under surveillance – alarm systems and tracking devices watched from a monitoring center – will grow from 10 million to 34 million during the same period. The site goes into some detail on the composition of the market.



M2M provides a deeper look into smart meters, the element of the smart grid industry that has been around the longest. The story quotes ABI Research numbers that 76 million smart meters were deployed worldwide by the end of last year. That number will jump to 212 million by 2014. Lux Research, the story says, predicts that the value of the smart grid market overall will grow from $4.5 billion now to $15.8 billion in 2015. The advanced metering infrastructure and smart meters will represent more than $5 billion of that.

The only thing that is certain is that growth will be significant. The dangers of making precise predictions are evident in the recent findings: Juniper says that the mobile and embedded M2M market will reach $18.9 billion by 2014, while Lux says the smart grid market alone will finish 2015 only $3.1 billion short of that figure. One thing that these firms would agree on, however, is that this is a giant opportunity.

You can also read Juniper Research's paper, 'M2M ~ Rise of the Machines' here.

Thursday, 11 February 2010

UICC and USIM in 3GPP Release 8 and Release 9


In good old days of GSM, SIM was physical card with GSM "application" (GSM 11.11)

In the brave new world of 3G+, UICC is the physical card with basic logical functionality (based on 3GPP TS 31.101) and USIM is 3G application on a UICC (3GPP TS 31.102). The UICC can contain multiple applications like the SIM (for GSM), USIM and ISIM (for IMS). There is an interesting Telenor presentation on current and future of UICC which may be worth the read. See references below.

UICC was originally known as "UMTS IC card". The incorporation of the ETSI UMTS activities into the more global perspective of 3GPP required a change of this name. As a result this was changed to "Universal Integrated Circuit Card". Similarly USIM (UMTS Subscriber Identity Module) changed to Universal Subscriber Identity Module.

The following is from the 3G Americas Whitepaper on Mobile Broadband:

UICC (3GPP TS 31.101) remains the trusted operator anchor in the user domain for LTE/SAE, leading to evolved applications and security on the UICC. With the completion of Rel-8 features, the UICC now plays significant roles within the network.

Some of the Rel-8 achievements from standards (ETSI, 3GPP) are in the following areas:

USIM (TS 31.102)
With Rel-8, all USIM features have been updated to support LTE and new features to better support non-3GPP access systems, mobility management, and emergency situations have been adopted.

The USIM is mandatory for the authentication and secure access to EPC even for non-3GPP access systems. 3GPP has approved some important features in the USIM to enable efficient network selection mechanisms. With the addition of CDMA2000 and HRPD access technologies into the PLMN, the USIM PLMN lists now enable roaming selection among CDMA, UMTS, and LTE access systems.

Taking advantage of its high security, USIM now stores mobility management parameters for SAE/LTE. Critical information like location information or EPS security context is to be stored in USIM rather than the device.

USIM in LTE networks is not just a matter of digital security but also physical safety. The USIM now stores the ICE (In Case of Emergency) user information, which is now standardized. This feature allows first responders (police, firefighters, and emergency medical staff) to retrieve medical information such as blood type, allergies, and emergency contacts, even if the subscriber lies unconscious.

3GPP has also approved the storage of the eCall parameters in USIM. When activated, the eCall system establishes a voice connection with the emergency services and sends critical data including time, location, and vehicle identification, to speed up response times by emergency services. ECalls can be generated manually by vehicle occupants or automatically by in-vehicle sensors.

TOOLKIT FEATURES IMPROVEMENT (TS 31.111)
New toolkit features have been added in Rel-8 for the support of NFC, M2M, OMA-DS, DM and to enhance coverage information.

The contactless interface has now been completely integrated with the UICC to enable NFC use cases where UICC applications proactively trigger contactless interfaces.

Toolkit features have been updated for terminals with limited capabilities (e.g. datacard or M2M wireless modules). These features will be notably beneficial in the M2M market where terminals often lack a screen or a keyboard.

UICC applications will now be able to trigger OMA-DM and DS sessions to enable easier device support and data synchronization operations, as well as interact in DVB networks.

Toolkit features have been enriched to help operators in their network deployments, particularly with LTE. A toolkit event has been added to inform a UICC application of a network rejection, such as a registration attempt failure. This feature will provide important information to operators about network coverage. Additionally, a UICC proactive command now allows the reporting of the signal strength measurement from an LTE base station.

CONTACT MANAGER
Rel-8 defined a multimedia phone book (3GPP TS 31.220) for the USIM based on OMA-DS and its corresponding JavaCard API (3GPP TS 31.221).

REMOTE MANAGEMENT EVOLUTION (TS 31.115 AND TS 31.116)
With IP sessions becoming prominent, an additional capability to multiplex the remote application and file management over a single CAT_TP link in a BIP session has been completed. Remote sessions to update the UICC now benefit from additional flexibility and security with the latest addition of the AES algorithm rather than a simple DES algorithm.

CONFIDENTIAL APPLICATION MANAGEMENT IN UICC FOR THIRD PARTIES
The security model in the UICC has been improved to allow the hosting of confidential (e.g. third party) applications. This enhancement was necessary to support new business models arising in the marketplace, with third party MVNOs, M-Payment and Mobile TV applications. These new features notably enable UICC memory rental, remote secure management of this memory and its content by the third party vendor, and support new business models supported by the Trusted Service Manager concept.

SECURE CHANNEL BETWEEN THE UICC AND TERMINAL
A secure channel solution has been specified that enables a trusted and secure communication between the UICC and the terminal. The secure channel is also available between two applications residing respectively on the UICC and on the terminal. The secure channel is applicable to both ISO and USB interfaces.

RELEASE 9 ENHANCEMENTS: UICC: ENABLING M2M AND FEMTOCELLS
The role of femtocell USIM is increasing in provisioning information for Home eNodeB, the 3GPP name for femtocell. USIMs inside handsets provide a simple and automatic access to femtocells based on operator and user-controlled Closed Subscriber Group list.

Work is ongoing in 3GPP for the discovery of surrounding femtocells using toolkit commands. Contrarily to macro base stations deployed by network operators, a femtocell location is out of the control of the operator since a subscriber can purchase a Home eNodeB and plug it anywhere at any time. A solution based on USIM toolkit feature will allow the operator to identify the femtocells serving a given subscriber. Operators will be able to adapt their services based on the femtocells available.

The upcoming releases will develop and capitalize on the IP layer for UICC remote application management (RAM) over HTTP or HTTPS. The network can also send a push message to UICC to initiate a communication using TCP protocol.

Additional guidance is also expected from the future releases with regards to the M2M dedicated form factor for the UICC that is currently under discussion to accommodate environments with temperature or mechanical constraints surpassing those currently specified by the 3GPP standard.

Some work is also expected to complete the picture of a full IP UICC integrated in IP-enabled terminal with the migration of services over EEM/USB and the capability for the UICC to register on multicast based services (such as mobile TV).

Further Reading:

Wednesday, 10 February 2010

Google real time speech translation mobile in couple of years

Live language translation on mobile phones could be just two years away, according to search giant Google. The company already offers text translation services and voice recognition, and Franz Och, head of translation services, says that work has already begun on combining the two.

The technology would work by translating phrases rather than individual words, and the company hopes that by looking at the huge amount of translated text already online, it can produce systems that are much more accurate than current versions. “If you look at the progress in machine translation and corresponding advances in voice recognition, there has been huge progress recently,” he said.

With over 6,000 languages spoken around the world, however, and only 52 currently on offer through Google’s existing translations services, the service is some way from meaning that language teaching in schools becomes redundant. “Clearly, for it to work smoothly, you need a combination of high-accuracy machine translation and high-accuracy voice recognition, and that's what we're working on,” said Mr Och.

So far, that is not yet possible, and language experts suggested that seamless technology is currently a distant prospect. David Crystal, honorary professor of linguistics at Bangor University, said the problems of dealing with speed of speech and range of accents could prove insurmountable.

'No system at the moment can handle that properly,' he added.


Tuesday, 9 February 2010

Coordinated Multi-Point (CoMP) transmission and reception

The industry’s first live field tests of Coordinated Multipoint Transmission (CoMP), a new technology based on network MIMO, were conducted in Berlin in October 2009. CoMP will increase data transmission rates and help ensure consistent service quality and throughput on LTE wireless broadband networks as well as on 3G networks. By coordinating and combining signals from multiple antennas, CoMP, will make it possible for mobile users to enjoy consistent performance and quality when they access and share videos, photos and other high-bandwidth services whether they are close to the center of an LTE cell or at its outer edges.

The following is from the 3G Americas report on CoMP:

Coordinated Multi-Point transmission/reception (CoMP) is considered by 3GPP as a tool to improve coverage, cell-edge throughput, and/or system efficiency.

The main idea of CoMP is as follows: when a UE is in the cell-edge region, it may be able to receive signals from multiple cell sites and the UE’s transmission may be received at multiple cell sites regardless of the system load. Given that, if the signaling transmitted from the multiple cell sites is coordinated, the DL performance can be increased significantly. This coordination can be simple as in the techniques that focus on interference avoidance or more complex as in the case where the same data is transmitted from multiple cell sites. For the UL, since the signal can be received by multiple cell sites, if the scheduling is coordinated from the different cell sites, the system can take advantage of this multiple reception to significantly improve the link performance. In the following sections, the CoMP architecture and the different CoMP schemes will be discussed.

CoMP communications can occur with intra-site or inter-site CoMP as shown in Figure 7.7.


With intra-site CoMP, the coordination is within a cell site. The characteristics of each type of CoMP architecture are summarized in Table 7.1.



An advantage of intra-site CoMP is that significant amount of exchange of information is possible since this communication is within a site and does not involve the backhaul (connection between base stations). Inter-site CoMP involves the coordination of multiple sites for CoMP transmission. Consequently, the exchange of information will involve backhaul transport. This type of CoMP may put additional burden and requirement upon the backhaul design.



An interesting CoMP architecture is the one associated with a distributed eNB depicted in Figure 7.8. In this particular illustration, the Radio Remote Units (RRU) of an eNB are located at different locations in space. With this architecture, although the CoMP coordination is within a single eNB, the CoMP transmission can behave like inter-site CoMP instead.

DL COMP

In terms of downlink CoMP, two different approaches are under consideration: Coordinated scheduling, or Coordinated Beamforming (CBF), and Joint Processing/Joint Transmission (JP/JT). In the first category, the transmission to a single UE is transmitted from the serving cell, exactly as in the case of non-CoMP transmission. However, the scheduling, including any Beamforming functionality, is dynamically coordinated between the cells in order to control and/or reduce the interference between different transmissions. In principle, the best serving set of users will be selected so that the transmitter beams are constructed to reduce the interference to other neighboring users, while increasing the served user’s signal strength.

For JP/JT, the transmission to a single UE is simultaneously transmitted from multiple transmission points, across cell sites. The multi-point transmissions will be coordinated as a single transmitter with antennas that are geographically separated. This scheme has the potential for higher performance, compared to coordination only in the scheduling, but comes at the expense of more stringent requirement on backhaul communication.

Depending on the geographical separation of the antennas, the coordinated multi-point processing method (e.g. coherent or non-coherent), and the coordinated zone definition (e.g. cell-centric or user-centric), network MIMO and collaborative MIMO have been proposed for the evolution of LTE. Depending on whether the same data to a UE is shared at different cell sites, collaborative MIMO includes single-cell antenna processing with multi-cell coordination, or multi-cell antenna processing. The first technique can be implemented via precoding with interference nulling by exploiting the additional degrees of spatial freedom at a cell site. The latter technique includes collaborative precoding and CL macro diversity. In collaborative precoding, each cell site performs multi-user precoding towards multiple UEs, and each UE receives multiple streams from multiple cell sites. In CL macro diversity, each cell site performs precoding independently and multiple cell sites jointly serve the same UE.

UL COMP

Uplink coordinated multi-point reception implies reception of the transmitted signal at multiple geographically separated points. Scheduling decisions can be coordinated among cells to control interference. It is important to understand that in different instances, the cooperating units can be separate eNBs’ remote radio units, relays, etc. Moreover, since UL CoMP mainly impacts the scheduler and receiver, it is mainly an implementation issues. The evolution of LTE, consequently, will likely just define the signaling needed to facilitate multi-point reception.

INTER-CELL INTERFERENCE COORDINATION

Another simple CoMP transmission scheme which relies on resource management cooperation among eNBs for controlling inter-cell interference is an efficient way to improve the cell edge spectral efficiency. The Inter-Cell Interference Coordination (ICIC) enhancement currently being studied for LTE-Advanced can be classified into dynamic Interference Coordination (D-ICIC) and Static Interference Coordination (S-ICIC). In D-ICIC, the utilization of frequency resource, spatial resource (beam pattern) or power resource is exchanged dynamically among eNBs. This scheme is flexible and adaptive to implement the resource balancing in unequal load situations. For S-ICIC, both static and semi-static spatial resource coordination among eNBs are being considered.

More information coule be found in:

Monday, 8 February 2010

3G Americas Publishes New Report on Technology choices for Mobile Broadband

3G Americas, a wireless industry trade association representing the GSM family of technologies including LTE, announced that it has published its highly anticipated resource report on 3rd Generation Partnership Project (3GPP) standards and their evolution to IMT-Advanced, or 4G. The white paper, 3GPP Mobile Broadband Innovation Path to 4G: Release 9, Release 10 and Beyond: HSPA+, SAE/LTE and LTE-Advanced, provides in-depth examination of 3GPP technology standards from a technical, business and applications standpoint.

“The 3GPP technology standards deliver mobile connectivity to more than 4 billion users worldwide today and have been developed to continue evolving to higher levels of performance with mobile broadband innovation,” said Chris Pearson, president of 3G Americas. “GSM operators can choose to evolve their networks in ways that best suit their assets and business environments with benefits that offer flexibility, scalability and economic advantages, whether they choose HSPA+ or LTE.”



UMTS-HSPA is the world’s leading 3G technology and is the preferred choice for the majority of wireless operators and subscribers today and into the future. The global demand for wireless data services continues to drive the rapid growth of HSPA technology with 303 commercial HSPA networks and over 454 million UMTS-HSPA subscriptions reported at the end of 2009 by Informa Telecoms & Media. Informa has further projected that by year-end 2012, worldwide subscriptions to UMTS-HSPA will reach nearly 1.4 billion; by year-end 2013, global UMTS-HSPA subscriptions are expected to exceed 2 billion, rising to 2.8 billion by the end of 2014. GSM-UMTS-HSPA subscriptions provide the foundation for future evolutions to 3GPP Release 9, Release 10 and beyond with HSPA+, LTE and LTE-Advanced.

“Wireless data consumption is increasing faster now than ever before,” said Adrian Scrase, 3GPP Head of Mobile Competence Center. “Smartphone usage is experiencing higher volumes and the superior user experience offered by such devices is resulting in quickly rising demand and escalating use of wireless data applications. This is consequently driving the need for continued innovations that are supported by the efficient and successful 3GPP technology path.”


3GPP Mobile Broadband Innovation Path to 4G: Release 9, Release 10 and Beyond: HSPA+, SAE/LTE and LTE-Advanced, is a comprehensive resource intended to assist members of the wireless industry as well as interested members of the general public in understanding details of the work in 3GPP on Release 9 and Release 10. In addition, the report further describes the features of Release 8 that were closed in March 2009.

Release 9, which is targeted for completion by March 2010, will provide increased feature functionality and performance enhancements to both HSPA and LTE. The report reviews additional multi-carrier and MIMO options for HSPA and features and enhancements to support emergency services, location services and broadcast services for LTE. Other Release 9 enhancements include those to support Home NodeB/eNodeB (i.e. femtocells), Self-Organizing/Self-Optimizing Networks (SON) and the evolution of the IP Multimedia Subsystem (IMS) architecture.

LTE will serve to unify the fixed and mobile broadband worlds. As an all IP-based technology, LTE will allow expansion of the Internet experience on mobile devices and deliver multimedia content to the screen of choice. The vast majority of leading operators, device and infrastructure manufacturers support LTE as the mobile broadband technology of the future and, according to Informa Telecoms & Media, 130 global operators have announced trials or intentions to evolve their networks to LTE. Two commercial networks have already been launched in Norway and Sweden by TeliaSonera in 2009 and as many as 20 will be launched in 2010.

“All roads lead to LTE – for GSM, CDMA, newly licensed and potentially even WiMAX mobile operators,” Pearson added. “The appeal of the 3GPP technology roadmap is no longer suited for only GSM operators.”

While work for Release 9 is nearing completion, significant progress has already been made in 3GPP on work for Release 10, which includes LTE-Advanced. In fact, 3GPP already submitted a proposal in October 2009 based on LTE-Advanced for the IMT-Advanced evaluation and certification process led by the International Telecommunication Union (ITU). The ITU has defined requirements that will officially define and certify technologies as IMT-Advanced, or 4G, and is expected to evaluate submitted proposals by standards organizations for potential certification in the 2010 timeframe; certified 4G/IMT-Advanced technology specifications are projected to be published by early 2011.

As part of Release 10, some of the key LTE-Advanced technology enhancements include carrier aggregation, multi-antenna enhancements and relays. Assuming LTE-Advanced is certified to be IMT-Advanced compliant, 3GPP targets completion of the Release 10 specification by year-end 2010.

“The white paper by 3G Americas provides an excellent overview of the work by 3GPP in determining the standards on the path to 4G,” Scrase said.

The popular white paper, 3GPP Mobile Broadband Innovation Path to 4G: Release 9, Release 10 and Beyond: HSPA+, SAE/LTE and LTE-Advanced, was written collaboratively by members of 3G Americas and is available for free download here.

Thursday, 4 February 2010

Bluetooth 3.0 to see the light of day soon

Picture Source: 3g.co.uk and simbasics.co.uk

Remember Bluetooth 3.0? Its been a while and the world has changed in the mean time.

Samsung S8500 will launch next-generation Bluetooth 3.0, a protocol that will establish transfer speeds up to eight times faster than 2.0… 24mbps!

Samsung have not been officially announced yet to carry the Bluetooth 3.0 on the S8500 but the device has been leaked to carry 3.0 Bluetooth connectivity that will dwarf previous 3mbps speeds.

The listing from the Bluetooth Special Interest Group it is slim, compact, will come in several colours, and also contains quad-band GSM/EDGE radios. Other details are scarce, and it’s likely that the spec may change considerably before we get our hands on the actual handset

Broadcom is also focusing on Bluetooth 3.0, which allows Bluetooth-centric designers to use the 802.11 physical layer to provide Wi-Fi-speed data transfers in a Bluetooth environment. Bluetooth 3.0 supports bulk synchronization of music libraries between PCs and music players or phones, supports wireless transfer of photos to printers, and sends video files from cameras or phones to computers or televisions. An alternative for Wi-Fi-centric designers, says Ochikubo, is Wi-Fi Direct, which enables Wi-Fi devices to connect and share data without joining a traditional home, office, or hot-spot network. Whatever approach Broadcom’s customers choose to take, he says, he sees Broadcom’s recently announced InConcert Maestro software platform as making the operation simple and transparent for the end user.

In addition to focusing on the higher speeds that Bluetooth 3.0’s Wi-Fi physical layer affords, the Bluetooth Special Interest Group is also focusing on low-power applications with its “Bluetooth low-energy,” or Bluetooth 4.0, specification. Bluetooth low energy will address markets such as health care, sports and fitness, security, and home entertainment.

Wednesday, 3 February 2010

Informa LTE Awards 2010 at the LTE World Summit

Last year I covered the Femto Forum Awards at the Femtocells World Summit and have in past also covered the LTE World Summit in quite details. This year I will again be attending the LTE World summit and will hopefully be able to cover the LTE Awards in detail.

The awards will be for following categories:
  • Best Network/Device Testing Product for LTE
  • Best Contribution to LTE Standards (Individual or Company)
  • Significant Progress for a Commercial Launch of LTE by an Operator
  • Significant Progress for a Commercial Launch of LTE by a Vendor
  • Best Enabling Product/Technology for LTE (components, subsystems etc)
  • Best Contribution to Research & Development for LTE
  • Best Green LTE Product or Initiative
  • Award for Individual Contribution to LTE Development

To enter, visit www.lteawards.com Choose the category/ies you would like to enter and put together the supporting materials – full details available on the website. Submit your entry/ies by 26th February 2010.

Brochure available here.

Tuesday, 2 February 2010

Best Selling Mobiles of 2009

Summary of 2009 results via Communities Dominate Brands:


ALL HANDSET MAKERS TOP 10

1 - Nokia . . . . . . . 432 Million 38 %
2 - Samsung . . . . 227 Million 20 %
3 - LG . . . . . . . . . . 117 Million 10 %
4 - SonyEricsson . . . 57 Million 5 %
5 - Motorola . . . . . . . 55 Million 5 %
6 - ZTE . . . . . . . . . . 50 Million 4.5%
7 - Kyocera . . . . . . . 45 Million 4 %
8 - RIM . . . . . . . . . 35 Million 3.5%
9 - Sharp . . . . . . . . 29 Million 2.6 %
10 - Apple . . . . . . . . 25 Million 2.2 %
Others . . . . . . . . . . 56 Million 5%
TOTAL . . . . . . . . 1,130 Million (1.13 Billion)




SMARTPHONES

1 - Nokia . . . . 68 Million 39%
2 - RIM . . . . . 35 Million 20%
3 - Apple . . . . 25 Milllion 15%
4 - HTC . . . . . 8 Million 5%
5 - Others . . . 35 Million 21%
Total . . . . . . 175 Million

SMARTPHONE OPERATING SYSTEMS

1 - Symbian . . . . . . . 45%
2 - RIM . . . . . . . . . . . 20%
3 - Apple . . . . . . . . . 15%
4 - Windows Mobile . . 6%
5 - Google Android . . . 4%
Others . . . . . . . . . . . 10%

More details here.

Monday, 1 February 2010

Mobile Digital TV in US coming soooon (Q1 2010)

In 2007, transmission of full-motion digital television signals to mobile and handheld devices was proven technically feasible. Leaders of the broadcasting industry came together to make mobile digital television a reality; they formed the Open Mobile Video Coalition (OMVC) to accelerate the development and rollout of mobile DTV products and services, maximizing the full potential of the digital television spectrum.

Today the OMVC truly represents the industry, with members that own and operate more than 800 commercial and public television stations nationwide.

There was a lot of publicity of MDTV at the CES 2010 recently in Lag Vegas, USA. Here are few Youtube clips on MDTV.








There is also an interesting OMVC Mobile TV Use Cases document available here.

Sunday, 31 January 2010

Indian Mobile Users just keep increasing



India, the world's fastest-expanding mobile market, added more than 19 million cellular users last month to post the biggest monthly growth ever, according to official data Thursday.

India's number of mobile subscribers swelled by 19.10 million in December after climbing by 17.65 million the previous month, driven by some of the world's cheapest calling rates.

December's increase was a record for monthly wireless subscriber growth, according to figures from the Telecom Regulatory Authority of India (TRAI) posted on its website.

India's mobile phone companies added an average of nearly 15 million subscribers a month in 2009 to bring the total number of cellular users to 525.15 million - up 51.4 percent from December 2008.

The sector's explosive growth has drawn a flood of global entrants in the past few years, sparking a cut-throat billing war among the players which has hit revenues and profits.

The new players that have beaten a path to the country of nearly 1.2 billion people include Norway's Telenor, Japan's NTT DoCoMo, Britain's Vodafone and Russia's Sistema JSFC, hoping to boost revenues and make up for saturated domestic markets.

At least another four cellular company launches are expected in the first half of this year in India including Emirates Telecommunications Corp, or Etisalat, India's Datacom Solutions and Loop Telecom.

With the new users added in December, 45 out of every 100 people in India now have a mobile phone. Total teledensity including fixed-line users now stands at 48 percent of the population.

The Cellular Operators' Association of India forecasts the country's mobile phones will number one billion by 2013.

But industry leaders and analysts say the cellular market is getting too crowded and forecast a savage period of consolidation in which the number of players will get whittled down to around half a dozen from the 14 currently.

As mobile subscriptions surged, the number of fixed-line telephone subscribers continued to fall, edging down to 37.06 million at the end of December from 37.16 million a month earlier, according to the TRAI figures.