Wireless Cellular Router/Modem/Antenna Blog

Frequency bands in 4G LTE

Posted by admin | Posted on 01-04-2012

The LTE standard can be used with many different frequency bands. China use TD-LTE in 2600Mhz

In North America, 700/ 800 and 1700/ 1900 MHz are planned to be used; 800, 1800, 2600 MHz in Europe; 1800 and 2600 MHz in Asia; and 1800 MHz in Australia. As a result, phones from one country may not work in other countries. Users will need a multi-band capable phone for roaming internationally.

Also, the Brazilian government and CnPQ, are testing a specific version of LTE under 450 MHz frequency band, specific for the rural market.

Difference in between LTE FDD and TDD?

Posted by admin | Posted on 01-04-2012

Category : Technologies

Tags: 4g, 4g lte, lte

What is difference in between LTE FDD & TDD?

In both LTE FDD and LTE TDD, the transmitted signal is organized into subframes of 1 millisecond (ms) duration and 10 subframes constitute a radio frame. Each subframe normally consists of 14 OFDM symbols (12 OFDM symbols in case of the so-called Extended Cyclic Prefi).

Although the frame structure is, in most respects, the same for LTE FDD and LTE TDD, there are some differences between the two, most notably the use of special subframes in TDD. Another difference is the other subframes are allocated either for uplink transmission or for downlink transmission.

In case of FDD operation, there are two carrier frequencies, one for uplink transmission (fUL) and one for downlink transmission (fDL). During each frame, there are consequently 10 uplink subframes and 10 downlink subframes and uplink and downlink transmission can occur simultaneously within a cell.

In case of TDD operation, there is only one single carrier frequency and uplink and downlink transmissions in the cell are always separated in time. As the same carrier frequency is used for uplink and downlink transmission, both the base station and the mobile terminals must switch from transmission to reception and vice versa. Thus, as a subframe is either an uplink subframe or a downlink subframe, the number of subframes per radio frame in each direction is less than 10.

Check further info at www.szelins.com for 4G LTE info.

4G TD-LTE new network

Posted by admin | Posted on 01-04-2012

Category : Technologies

Tags: 4g lte, 4g lte modem, 4g lte router, lte, lte modem, lte router

What is TD-LTE?

TDD (time division duplex) version of LTE is known as TD-LTE. Recently operators and vendors across world have requested the 3GPP standards body to begin working on specifications that would enable TD-LTE to be deployed in the 2.6 GHz band of spectrum as well. This frequency band is currently used for WiMAX and would allow operators like Clearwire to make it possible to deploy TD-LTE at 2.6GHz in the US.

The FDD LTE and TD-LTE versions of the 3GPP standard are very similar. As a result, devices can support both the FDD and TDD interfaces through a single chipset–i.e., without any additional cost. This is a hugely important new development: TD-LTE will benefit from the wide availability of FDD LTE devices that will be able to support TD-LTE as well. Unlike WiMAX, TD-LTE does not need to prove to have a substantial market share to convince vendors to develop devices. Vendors do not need to develop new devices, they simply need to add TD-LTE support to the existing ones.
There is a lot of TDD spectrum available, and in most cases it is cheaper and under-utilized. 3G licenses frequently have TDD allocations and upcoming 2.5 GHz auction in most cases contemplate TDD bands.
The increasing availability of base stations that can be cost-effectively upgraded will make it possible and relatively inexpensive for WiMAX operators to transition to TDâ€‘LTE using the same spectrum allocation. The transition will still require substantial efforts and be justified only in some cases, but it will make it easier for WiMAX operators to have roaming deals and to have access to the same devices that LTE operators have.
Industry commitment to WiMAX 16m, the ITU-Advanced version of WiMAX and successor to the current WiMAX 16e, is still limited.

The proposal is to adopt the 2496MHz-to-2690MHz frequency band in the US for TD-LTE. Part of the 2.6GHz band is already specified for TDD, namely the 2570MHz-to-2620MHz band.

Currently, the LTE standards support both FDD and TDD operation. Fifteen paired (for FDD operation) and eight unpaired (for TDD operation) spectrum bands have already been identified by the 3GPP for LTE as shown below.

Eâ€‘UTRA Operating Band	Uplink (UL) operating band BS receive UE transmit			Downlink (DL) operating band BS transmit UE receive			Duplex Mode
Eâ€‘UTRA Operating Band							Duplex Mode
1	1920 MHz	-	1980 MHz	2110 MHz	-	2170 MHz	FDD
2	1850 MHz	-	1910 MHz	1930 MHz	-	1990 MHz	FDD
3	1710 MHz	-	1785 MHz	1805 MHz	-	1880 MHz	FDD
4	1710 MHz	-	1755 MHz	2110 MHz	-	2155 MHz	FDD
5	824 MHz	-	849 MHz	869 MHz	-	894MHz	FDD
6	830 MHz	-	840 MHz	875 MHz	-	885 MHz	FDD
7	2500 MHz	-	2570 MHz	2620 MHz	-	2690 MHz	FDD
8	880 MHz	-	915 MHz	925 MHz	-	960 MHz	FDD
9	1749.9 MHz	-	1784.9 MHz	1844.9 MHz	-	1879.9 MHz	FDD
10	1710 MHz	-	1770 MHz	2110 MHz	-	2170 MHz	FDD
11	1427.9 MHz	-	1447.9 MHz	1475.9 MHz	-	1495.9 MHz	FDD
12	698 MHz	-	716 MHz	728 MHz	-	746 MHz	FDD
13	777 MHz	-	787 MHz	746 MHz	-	756 MHz	FDD
14	788 MHz	-	798 MHz	758 MHz	-	768 MHz	FDD

17	704 MHz	-	716 MHz	734 MHz	-	746 MHz	FDD
…
33	1900 MHz	-	1920 MHz	1900 MHz	-	1920 MHz	TDD
34	2010 MHz	-	2025 MHz	2010 MHz	-	2025 MHz	TDD
35	1850 MHz	-	1910 MHz	1850 MHz	-	1910 MHz	TDD
36	1930 MHz	-	1990 MHz	1930 MHz	-	1990 MHz	TDD
37	1910 MHz	-	1930 MHz	1910 MHz	-	1930 MHz	TDD
38	2570 MHz	-	2620 MHz	2570 MHz	-	2620 MHz	TDD
39	1880 MHz	-	1920 MHz	1880 MHz	-	1920 MHz	TDD
40	2300 MHz	-	2400 MHz	2300 MHz	-	2400 MHz	TDD

See LTE router and LTE modem.

UMTS-FDD frequency

Posted by admin | Posted on 05-03-2012

Category : Technologies

Tags: umts, umts band, umts frequency

The world’s mobile network operators have deployed UMTS-FDD technology in the following paired bands:

Operating Band	Frequency Band	Common Name	UL Frequencies UE transmit (MHz)	DL Frequencies UE receive (MHz)	Channel Number (UARFCN) UL	Channel Number (UARFCN) DL	Region
I	2100	IMT	1920–1980	2110–2170	9612 – 9888	10562 – 10838	Europe, Asia, Africa,Israel(Cellcom, Pelephone,Orange), Oceania (Telstra, Optus, Vodafone AU & NZ, Three Mobile AU, 2° and Telecom NZ),Brazil
II	1900	PCS	1850–1910	1930–1990	9262 – 9538 additional 12, 37, 62, 87, 112, 137, 162, 187, 212, 237, 262, 287	9662 – 9938 additional 412, 437, 462, 487, 512, 537, 562, 587, 612, 637, 662, 687	Americas(AT&T, T-Mobile,BellMobility, Telcel, Telus,Rogers,Venezuela(Movilnet, Movistar))
III	1800	DCS	1710–1785	1805–1880	937 – 1288	1162 – 1513	Europe, Asia,Oceania
IV	1700	AWS	1710–1755	2110–2155	1312 – 1513 additional 1662, 1687, 1712, 1737, 1762, 1787, 1812, 1837, 1862	1537 – 1738 additional 1887, 1912, 1937, 1962, 1987, 2012, 2037, 2062, 2087	USA(T-Mobile,CincinnatiBellWireless),Canada(WINDMobile, Mobilicity, Videotron),Chile(VTR, Nextel)
V	850	CLR	824 – 849	869 – 894	4132 – 4233 additional 782, 787, 807, 812, 837, 862	4357 – 4458 additional 1007, 1012, 1032, 1037, 1062, 1087	Americas (AT&T, Bell Mobility, Telcel, Telus, Rogers), Oceania (Telstra, Vodafone Hutchison Australia, Telecom NZ), Dominican Republic (Claro), Hong Kong (SmarTone[8]), Israel (Cellcom, Pelephone), Thailand (TrueMove[9]), Brazil (Claro, Vivo), Philippines(Smart Communications[10])
VI	800		830 – 840	875 – 885	4162 – 4188 additional 812, 837	4387 – 4413 additional 1037, 1062	Japan (NTT docomo)
VII	2600	IMT-E	2500–2570	2620–2690	2012 – 2338 additional 2362, 2387, 2412, 2437, 2462, 2487, 2512, 2537, 2562, 2587, 2612, 2637, 2662, 2687	2237 – 2563 additional 2587, 2612, 2637, 2662, 2687, 2712, 2737, 2762, 2787, 2812, 2837, 2862, 2887, 2912	Europe (future),United States,Canada(future)
VIII	900	GSM	880 – 915	925 – 960	2712–2863	2937 – 3088	Europe[11], Asia(Hong Kong CSL Limited[12]), Oceania (Optus, Vodafone AU, Vodafone NZ), Dominican Republic (Orange), Venezuela (Digitel GSM), Thailand (AIS[13]), Cell CSouth Africa Cell C
IX	1700		1749.9 – 1784.9	1844.9 – 1879.9	8762 – 8912	9237 – 9387	Japan(E Mobile, NTT docomo)
X	1700		1710–1770	2110–2170	2887 – 3163 additional 3187, 3212, 3237, 3262, 3287, 3312, 3337, 3362, 3387, 3412, 3437, 3462	3112 – 3388 additional 3412, 3437, 3462, 3487, 3512, 3537, 3562, 3587, 3612, 3637, 3662, 3687
XI	1500		1427.9 – 1447.9	1475.9 – 1495.9	3487 – 3562	3712 – 3787	Japan(SoftBank Mobile)
XII	700	SMH	698 – 716	728 – 746	3612–3678 additional 3702, 3707, 3732, 3737, 3762, 3767	3837–3903 additional 3927, 3932, 3957, 3962, 3987, 3992	USAandCanada(future) (lower SMH blocks A/B/C)
XIII	700	SMH	777 – 787	746 – 756	3792–3818 additional 3842, 3867	4017–4043 additional 4067, 4092	USA,Canada(future) (upper SMH block C) (Verizon Wireless)
XIV	700	SMH	788 – 798	758 – 768	3892–3918 additional 3942, 3967	4117–4143 additional 4167, 4192	USAandCanada(future) (upper SMH block D)
XIX	800		832.4 – 842.6	877.4 – 887.6	312-363 additional 387, 412, 437	712-763 additional 787, 812, 837