lte pdcch

12.1 Preface One of the main functions provided by pdcch is to transmit physical layer Resource Allocation instructions, and pdcch indicates frequency-domain resource allocation on each sub-frame. The main challenge in designing signal allocation for frequency-domain resources (a group of resource blocks) is to find a good solution between flexibility and scheduling overhead. One feasible method is to send

two codewords exist in the corresponding downlink sub-frame. At this time, the two bit harq feedback in the sub-frame is still used, without binding space (spatial bundling ). In ack/Nack multiplexing, when the uplink sub-frame corresponds to multiple downlink sub-frames (up to four), one or four bit ack/Nack (section 5.2.2.6, 3GPP 36.212), allows a downstream sub-frame to correspond to a bit. The correspondence between the bit of harq and the downlink sub-frame is described in detail later. In

-frame is to allow the terminal to decode the downlink dispatch information at an early stage (the translator note: The terminal can know how to decode the Dl-sch information), so that the terminal before the end of the sub-frame transmission can be Dl-sch demodulation and decoding, reduce dl-sch decoding delay, This reduces the delay of the overall downstream transmission. More importantly, the control domain is placed at the beginning of the sub-frame, then those non-scheduled terminals do not

"chicken eggs" and "egg chickens": Calculating the location of the Phich requires the use of SIB1 's pdcch information ( ul/dlconfig parameter in Pdsch is required to determine Mi value ), and the Phich information is required to calculate the PDCCH channel . Therefore, in order to solve this problem,when decoding SIB1, the terminal does not need to know the value of mi (i.e., the terminal will try mi =0,1

In recent years, the increasing demand for mobile data services has promoted the acceleration of LTE network commercialization. Throughout the world, LTE commercial networks are still dominated by lte fdd, but with the gradual development of their networks, users and businesses are increasing, lte fdd network frequency

role, is the bearer of the current sub-frame pdsch scheduling control information ; the second function is the network side The PDCCH Order is initiated by DCI1A and the non-competitive random access process is triggered . For non-competitive random access related content, please refer to the LTE-TDD random access process (6)-sub-scenario description of competitive access and non-competitive access proces

China's LTE commercialization is approaching, and the industry's attention to the subsequent evolution of LTE has reached a new peak. Compared with 3G, LTE significantly improves the spectrum efficiency. However, the industry has not stopped. A few years ago, 3GPP began to research and develop the LTE-Advanced standard

Currently there are two 4G standards based on LTE, namely LTE FDD and LTE TDD (the domestic custom of LTE TDD is called Td-lte). See the name you will have an intuitive impression, the two standards are based on the different branches of

4G TDD-LTE and FDD-LTE two models, do you understand? At present, there are two 4G standards based on LTE, namely lte fdd and lte tdd (China is used to call lte tdd TD-LTE, both stand

: An SI can contain multiple sib, and multiple si have a common si window length; SIB2 content: Common channel configuration, upstream carrier frequency, bandwidth, Radio Resource, MBSFN (multimedia Broadcast Multicast Services single frequency network), Rach required information SIB3 ... SIB12: Public resources and re-election of various information; Second, the system message acquisition process the entire system receives the process to need: Obtains the MIB, obtains the Sib type1 the Si infol

LTE beginners, if you also for the LTE self-study and confused;LTE scholars, if you're still worried about the effectiveness of LTE learning,If you want to learn LTE well instead of simply learning about LTE,To make

, there are proposals that do not even recommend that unicast RS be retained in the MBSFN sub-frame.However, the complete removal of unicast RS in the MBSFN sub-frame also brings another serious problem, namely, the absence of unicast RS, adjacent cell UE can not be in this sub-frame neighbor measurement. Moreover, because the adjacent cell UE may not know which frame in the cell is MBSFN sub-frame, it causes the UE in any sub-frame that may be MBSFN sub-frame can not be measured in the neighbor

There is types of frame structure in the LTE standard, type 1 and type 2. Type 1 uses Frequency Division duplexing (Uplink and downlink separated by Frequency), and TDD uses time division Duplexin G (Uplink and downlink separated in time). This overview covers both LTE FDD Type 1 signals and LTE TDD type 2 signals described in the standard documents listed in The

After writing the previous blog, "LTE cell search-Physical cell ID and synchronization signal PSS, SSS," I would like to continue to write system information related content, but found to write the time necessary to involve PDCCH, Phich and other content, and these content has not been systematically written. So the next few posts will write some of the LTE backg

The Charm Clan MX5 cracked unicom/Mobile 4g/3g (TD-LTE/TD-SCDMA/FDD-LTE/WCDMA) Prerequisite: To ensure adequate electricity, at least 50%. Use pea pods, application treasure, etc. to back up important information. 1, download MX5 General edition firmware (http://www.flyme.cn/firmware.html) 2, after downloading, the handset and the computer through the data line connection. Hint: The screenshot b

control channel (pucch) transmits upstream control information, and physical downlink control channel (pdcch) transmits DCI. During Enode B scheduling, allocate the data transmission resource location for the UE and notify the UE through DCI. In the middle, at the time of N, the UE first obtained the pdcch blind solution, and obtained any of the DCI formats 1 to 2a, so that we can know the location of the

, then the payload length of the DCI0 Bitstream is (1+1+11+5+1+2+3+2+1) = 27, so l_format=27,n=13. Because 13 (Fig. 1) (Figure 2 Table to look for when adjusting Pusch power) (Figure 3 The table to look for when adjusting the PUCCH power) 2.UE How to determine whether the current pucch adjustment or Pusch adjustment Since DCI3 can adjust the power of Pusch, can also adjust the power of the PUCCH, then how to differentiate the UE? Here the protocol uses different Rnti values to differentiate.

, and the dwpts length of 2nd half frames is 1 ms. Uppts and sub-frame 2 are used as the uplink, and sub-Frames 7 and 9 are used as the downlink.Physical resources Basic time unit Antenna Port LTE uses antenna ports to differentiate space resources. The definition of an antenna port is defined from the receiver's perspective. That is, if the receiver needs to distinguish the difference in space between resources, multiple antenna ports need to be d

preamble (the preamble value cannot be 0), as follows.Competing access is required if non-competitive access is not possible. is the main flowchart of the competition process, do not carry a preamble or a preamble value of 0, indicating that the UE needs to perform competitive access.Because it is a competing access, the source ENB sends a reconfiguration message without a preamble cell or with a preamble value of 0. In addition, because the Crnti before switching is present, MSG4 uses the exis

Influence of LTE technology on PTN China and the rest of the world are entering the brand new 4G/LTE era at full speed. As a mobile return technology, PTN faces severe challenges even after years of evolution and maturity. Some of these technological changes are huge enough to trigger a PTN revolution. This article takes into account the deployment of macro base stations and micro base stations, and review