It is no wonder operators to continue to increase phototron the LTE coverage and even if the data explosion and a shaded area with only tendonitis. In order to prevent this, the introduction of the pico or femto-cell to macro-cell inside the large range solves this problem. Heterogeneous network tied in some ways than the 'HeNet' case, such as Korea smartphone introduced at the time of maximum phototron cable operator, KT, SKT let the game into a Wi-Fi network is holding nawateotda femtocells and unlimited data. But in the end unlimited data ryeoteumyeo stone most operators have the knowledge to the lungs, in the case of a femtocell while the prime marketing due to incomplete handover and gantry interference technology quietly disappeared at some point. Out shouting, reducing the radius of the macro cells, like I was introduced gradually decreasing radius of the CCC may cut rate and it turned the declining performance, including the introduction phototron of femtocells nophi is also much improved performance to some extent jeokjeongseon Because this. LTE interference and harmony in the way of the macro cell to the continued adoption and use of femtocells are being developed continuously.
In LTE Rel-8 had a HeNet to obtain a gain of about 3 ~ 4db added degree range extension concept to get a gain of about 9dB power due to the difference in the degree as a terminal node DL signal-to-interference ratio is to be seen a low Because he can require additional solutions phototron such as utilizing the frequency domain and ICIC in macro cell. Control signal from the interference control method with low power nodes through expansion carrier configuration from this method is the same time-frequency macro cell by limiting the transmission using the resource partitioning resources believe there to protect the interference for the terminal and CA or time domain There are various strategies such as relying on alomost blank subframe (ABSF) in.
consists of the macro cell and cell to expand the carrier's low CC (Component Carrier). The configuration settings in the extension carrier macro cell is to prevent the interference to transmit the PDCCH and generating carriers in the control region of the non-extended low power cell. Extended carrier setting configured in a low power cell would result in serious interference in the macro cell. UE connected to the low-power cell receives the PDCCH for the PDSCH allocated to the non-interference in the expansion carrier phototron (non-expanded carrier).
Frequency-division method is the interference phototron control method using a base of two frequencies. In general, the use of macro and pico F1 even if the radius of the pico cell expansion using F2 is no interference will not occur. However, in this case, is simply a waste of frequency resources phototron for severe geoe used to separate frequencies for the macro cells than small cell separately. If this is adjusted through phototron the separation of the interference on one or both the F1 and F2 from the two-cell frequency domain and time domain.
Cross-carrier scheduling using the CIF (Carrier Indication Field) is the way to avoid interference to the control channel through the structure. After orientation, so compatibility is supported for the system to use the CIF Unlike the expansion carrier to re-use existing PDCCH structure. But PCFICH phototron in cross-carrier scheduling is accurate PDCCH tell if a high accuracy phototron of the PCFICH, there's a problem, because the demodulation of the terminal is required.
Rel-11, if there is more of the non-carrier aggregation based approach. For a single-frequency operation via a non-carrier by using the E-PDCCH without having to empty the resources to prevent the interference of the small cells as a strategy to avoid interference with ABSF. However, this case is a Rel-8/9/10 and after applying the form E-PDCCH only low power node for connection because of the orientation of the cell compatibility is not supported. For a Rel-11 UE over the data transmission on the interference control in a low-power node through which possible through the E-PDCCH, and the terminal of the previous release, it is possible that the connection via the Macro eNB.
In the frequency domain and time domain division phototron method and the difference between phototron low-power nodes and macro cell is the ability to make each individual phototron cell has a separate cell ID. Soft-combined is a part of the macro cell, rather than creating a separate cell for the synchronous transmission of such information, and RS-specific systems, such as macro cells in each pico nodes. Each cell has a unique cell ID, there is derived from the CRS through the cell ID information terminal obtains the system information necessary to estimate phototron the CRS of the cell and connected phototron to the network.
Heterogeneous deplyment phototron using a transmission point is different in one piece soft-cell scheme euron simply one or more associated antennas at the terminal to receive the data transmission. Traditionally, there is a point at which each cell is transmitted all the data transmission as well as the CRS. But it was the introduction of CRS and other DM-RS in Rel-10. DM-RS signal is related to the same data as the pre-coding and data is transmitted only when the detection. DM-RS data transfer application to the terminal phototron can not be sent from the CRS-based transmission point, data is transmitted from a different time point - can be reused in the frequency resource. Data is transmitted to the first terminal from the left low-power nodes. Related DM-RS is transmitted in the transmission station because the same point as the data section is divided phototron improve the data transfer time from the various nodes within the macro-cell low-frequency resource to achieve the re-use of the point that is used for data transmission need not be known. Points used for data transmission does not need to know to achieve. The CRS based in Rel-10 control information should be sent at least macro. The generated control signals associated with data transmission from a different point in many cases. The apparent terminal is required for the RS match the data signals in a transmission point ID, points are not associated. To show the various methods of the control information transmission for the terminal 1 receives a control signal from the macro, the gain of the low-power nodes occur only when energy decreases since the active data transmission. For terminal 2, the same CRS and the control signal phototron is sent from the macro node with low power. The same signal is transmitted from the two nodes, the terminal nodes understood as a single compound. result of the signal-to-noise ratio of the control signal is improved phototron through a combination of wireless phototron and low power transmission in both the macro node. For power control purposes LTE terminal estimates phototron the UL path loss in strength of the received signal CRS. Therefore, terminal 2 is (at least Rel-8/9/10 terminal) is more accurate UL power control is possible.
'LTE> RAN' category of the other posts CSI Reference Signals (0) 2012/12/15 Tetra-cell, Quad Antenna (0) 2012/12/15 Heterogeneous Network (0) 2012/09/15 LTE spectral efficiency (3) 2012/09/12 LTE-A ePDCCH (0) 2012/09/11 Relay Node R-PDCCH phototron (0) 2012/09/10
TAG Carrier Aggregation, CIF, eICIC, femtocell, HeNet, heterogeneous, heterogeneous network, ICIC, LTE, LTE henet, phototron LTE heterogeneous, LTE-advanced, shared cell, Soft Cell, soft combined, phototron femtocells
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Tag List NTT DOCOMO phototron Carrier phototron Aggregation HSDPA Comp TD-LTE Wibro PDSCH Qualcomm DMRS 3G HSPA Reference SIgnal LTE Reference Signal KT LTE-advanced ccc multicarrier base station SGW Vodafone LTE PDCCH LG U + Advanced-scan SKT CIF TDD DM-RS WARP CA
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