당신은 주제를 찾고 있습니까 “lte master information block – LTE Protocol Testing/LTE MIB and SIB/Master Information Block \u0026 System Information Block/eNB Testing“? 다음 카테고리의 웹사이트 https://chewathai27.com/you 에서 귀하의 모든 질문에 답변해 드립니다: https://chewathai27.com/you/blog. 바로 아래에서 답을 찾을 수 있습니다. 작성자 Talent \u0026 Tech Global Infotech 이(가) 작성한 기사에는 조회수 4,794회 및 좋아요 119개 개의 좋아요가 있습니다.
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MASTER INFORMATION BLOCK (MIB) – Techplayon
MASTER INFORMATION BLOCK (MIB) is the broadcast information transmitted by eNodeB at periodically. After Decoding the PSS and SSS …
Source: www.techplayon.com
Date Published: 5/20/2021
View: 2507
MIB(Master Information Block) – ShareTechnote
MIB(Master Information Block) · MIB is special signal that carries the following information. · i) DL Bandwth, Number of Transmit Antenna · ii) System Frame …
Source: www.sharetechnote.com
Date Published: 9/15/2022
View: 2993
Master Information Block in LTE – Telecompedia
It carries less, but important information to UE from the network. MIB (Master Information Block) is transmitted through BCCH –> BCH –> PBCH channels and PBCH …
Source: telecompedia.net
Date Published: 2/5/2021
View: 5789
LTE: Master Information Block – How LTE Stuff Works?
The MASTER INFORMATION BLOCK (MIB) includes a limited number of most essential and most frequently transmitted parameters that are needed to acquire other …
Source: howltestuffworks.blogspot.com
Date Published: 4/7/2021
View: 7008
What is MIB in LTE? – Long Term Evolution | 4G
MIB or Master Information Block is a very important message or information that is broadcasted by the LTE eNodeB irrespective of any users …
Source: ltebasics.wordpress.com
Date Published: 1/25/2021
View: 1962
LTE system information blocks-MIB,SIB-1,2,3,4,5,6,7,8,9,10,11
Static part is called as MIB and is transmitted using BCH and carried by PBCH once every 40ms. MIB carries useful information which includes channel bandwth, …
Source: www.rfwireless-world.com
Date Published: 2/6/2021
View: 2258
MIB : Master Information Block – Cafetele Telecom Training
Master Information Block · The MIB is always transmitted on the BCH with a periodicity of 80ms and repetitions within 80ms. · It includes parameters that are …
Source: cafetele.com
Date Published: 8/10/2021
View: 8288
Master Information Block (MIB) in LTE
Master Information Block (MIB) in LTE … Why PHICH is carried by MIB? After decoding MIB, UE has to decode PDCCH to read other system information blocks (SIBs).
Source: www.simpletechpost.com
Date Published: 1/22/2021
View: 9966
LTE System Information Block – PDFCOFFEE.COM
LTE system information is one of the key aspects of the air interface. It consists of the Master Information Block (MIB)…
Source: pdfcoffee.com
Date Published: 8/2/2022
View: 5885
주제와 관련된 이미지 lte master information block
주제와 관련된 더 많은 사진을 참조하십시오 LTE Protocol Testing/LTE MIB and SIB/Master Information Block \u0026 System Information Block/eNB Testing. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.
주제에 대한 기사 평가 lte master information block
- Author: Talent \u0026 Tech Global Infotech
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- Date Published: 2021. 7. 4.
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What is Master information Block in LTE?
The MASTER INFORMATION BLOCK (MIB) includes a limited number of most essential and most frequently transmitted parameters that are needed to acquire other information from the cell. The MIB is transmitted on BCH while all other SYSTEM INFORMATION messages are transmitted on DL-SCH.
What is MIB and SIB in LTE?
In LTE, MIB contains very limited information. It contains information about the cell bandwidth, some information about PHICH (Physical HARQ Indicator Channel) and the SFN. The SIB’s as I mentioned are transmitted on DL-SCH mapped on PDSCH.
What is MIB in bandwidth?
MIB is special signal that carries the following information. As you see, you can get the System Bandwidth and SFN by decoding MIB. i) DL Bandwidth, Number of Transmit Antenna. ii) System Frame Number (SFN)
What is the location of MIB & how often it will come?
Physical Broadcast channel is a physical layer channel and carried the Master Information Block. It is mapped Logical channel as BCCH and Transport channel as BCH. It occupies central 6 RBs (72 Subcarrier) in frequency domain and mapped on 4 symbols of first subframe second slot symbol 0, 1, 2 and 3.
What is difference between MIB and SIB?
System information is broadcast using a Master Information Block (MIB) and a series of System Information Blocks (SIB). UE starts by reading the MIB and this provides sufficient information to read SIB 1. SIB 1 provides scheduling information for the remaining SIB.
What happens when UE is powered on?
When you power on the mobile device, in most case the device is under a circumstance where it sees many base station (eNode B) around it. In some cases UE would be surrounded not by the multiple basestation from one system operator but by the multiple basestation from multiple system operators.
What is cell reselection in LTE?
Cell Re selection is a procedure used to change the cell after the UE is camped on a cell and stays in the Idle mode. This procedure is used to let the UE get camped on a cell which has the best radio conditions among all the other cells on which the UE is allowed to camp on.
What is SIB24?
Me: SIB24 (System Information Block 24) is configured at the 4G side to broadcast all the cell reselection info for the 5G UE, so it can perform cell reselection from 4G towards 5G, so SIB24 allows up to 8 5G carriers to be specified using their ARFCN. These ARFCNs correspond to the center frequency of the SSB Blocks.
What is SI window length in LTE?
SI Window Length: a window is defined to enable multiple transmissions of the SI message within the window. SI Window Length can be set to 1, 2, 5 10, 15, 20 or 40 ms.
What is SNMP and MIB?
Each management station or agent in an SNMP-managed network maintains a local database of information relevant to network management, known as the management information base (MIB). The relationship between the management station, the agent, and the MIB is shown in the following figure.
Is MIB same as MB?
A mebibyte is equal to 220 or 1,048,576 bytes. A megabyte is equal to 106 1,000,000 bytes. One mebibyte equals 1.048576 megabytes. The relatively small difference between the two is, in part, why they are often used synonymously.
What is OID and MIB?
The raw data (e.g. hardware temperature) is called an ‘object’ that resides within the device in a database, i.e. Management Information Base (MIB), and every object (the device statistics that you are trying to poll) is uniquely identified with an object identifier i.e. OID.
What are MIB files used for?
A management information base (MIB) is a database used for managing the entities in a communication network. Most often associated with the Simple Network Management Protocol (SNMP), the term is also used more generically in contexts such as in OSI/ISO Network management model.
What is a MIB table?
A Management Information Base (MIB) is a group of tables that specify the information that a subagent provides to a master agent. MIBs follow SNMP protocols. MIBs use a common interface definition language.
What is MIB structure?
The structure of Management Information Base (MIB) is a formatted text file that lists all of the data objects used by a particular piece of equipment. When you buy a monitor device that uses SNMP (for example, a managed switch), you’ll tell it to send messages to your central SNMP manager.
What is MIB in 5g?
MIB is mandatory system information that is broadcasted by the gNB at a set periodicity. During the initial cell selection procedure, UE assumes that the SSB is broadcasted every 20ms by the gNB. UE gets MIB by decoding the PBCH from the SS-PBCH block beam.
What is system frame number in LTE?
In LTE, the arm ticking in 10 ms interval has numbers between 0 and 1023 and these numbers are called SFN (System Frame Number) and the other arm ticking in 1 ms interval has numbers between 0 and 9, and this number is called subframe number.
MASTER INFORMATION BLOCK (MIB)
MASTER INFORMATION BLOCK (MIB) is the broadcast information transmitted by eNodeB at periodically. After Decoding the PSS and SSS information UE have the information of Physical cell ID and not it can descramble the further information which Master information Block, which will provide the System bandwidth, Antenna configuration , System frame number.
Bits and Bytes of Master information blocks:
Logical Channel – BCCH (Broadcast common control Channel)
Transport Channel – BCH (Broadcast Channel)
Physical Channel – PBCH (Physical Broadcast channel)
RLC Mode – ™(Transparent Mode)
Size of Master Information Block – 24 Bits
Resource Block Requirement – MIB require 6 RBs (72 subcarriers) in Frequency domain
Location in Resource Grid – 4 symbols of first subframe second slot symbol 0, 1, 2 and 3.
Channel Coding – tail bit convolutional encoding
Rate matching – 1/16 Rate coding (repetition coding)
Modulation – QPSK
Message content of MIB as per 3gpp 36.331
MasterInformationBlock ::= SEQUENCE {
dl-Bandwidth ENUMERATED { n6, n15, n25, n50, n75, n100},
phich-Config PHICH-Config,
systemFrameNumber BIT STRING (SIZE (8)),
spare BIT STRING (SIZE (10))
}
All above content is sent as 24bits binary information and these 21bits can be splitted as below:
3 bits for system bandwidth (000-111 )
3 bits for PHICH information,(1 bit to indicate normal or extended PHICH , 2 bit to indicate the PHICH Ng value)
8 bits for system frame number
10 bits are reserved for future use
Apart from the above information, the MIB CRC also provides the number of transmit antennas used by the eNodeB. The MIB CRC is scrambled with an antenna specific mask.
To get know more about the transmission and Generation of Master Information please read our post on Physical Broadcast channel
Physical Broadcast channel is a physical layer channel and carried the Master Information Block. It is mapped Logical channel as BCCH and Transport channel as BCH. It occupies central 6 RBs (72 Subcarrier) in frequency domain and mapped on 4 symbols of first subframe second slot symbol 0, 1, 2 and 3. PBCH channel uses QPSK modulation.
Below is the
PBCH Transmission :
The MIB information is generated at every 40 ms or we can say after every 4 System frame number and sent to physical layer for encoding. Now Physical layer transmits it at every 10 ms or we can say it broadcast it every system frame number. Physical layer transmits new MIB information only at SFN mode 4=0 and at other SFN is only transmits the redundancy version. The below Picture depict the same. All Dark blue are the New MIB which may or may not change every 40ms and light blue are the RV (Redundant Version) of Original MIB
The MIB payload worth 24 bit is received from upper to physical layer and the physical layer do the following process,
CRC Generation – Here a 16 bit CRC is generated by the CRC module and it is scrambled with a antenna specific mask and same mask is used by UE while find out the antenna configuration.
CRC attachment to MIB – The generated CRC is attached to the MIB payload after which the size of the payload will be 40 bits (24 bit of MIB + 16 bit of CRC)
Convolutional encoding – A tail bit convolutional encoding is performed over the 40 bits and the output is 3 streams of 40 bits each
Rate matching – The rate matching here is nothing but a repetition coding, where the 3 streams of size 120 bits (40×3 bits) is just repeated 16 times to get 1920 bits. The repetition rate is very high since the MIB is a very vital information and the UE cannot afford to lose it.
Scrambling – These 1920 bits are scrambled with a scrambling sequence as long as 1920 bits
Modulation (QPSK) – A QPSK modulation is performed over these 1920 bits to obtain 960 complex QPSK symbols (Symbols = Total no of bits/Bits per Symbol)
This is the basic operation for PBCH encoding, but since the PBCH has to be transmitted every 10 milliseconds on subframe 0 of all radio frames, the PBCH modulation buffer is divided into 4 sub-buffers each as long as 240 complex symbols. Each sub-buffer is transmitted over PBCH and by the time the last sub buffer is transmitted on PBCH, a new MIB is arrived from higher layer which is again encoded using the above method and the process continues
As you see from the above diagram, a new MIB is generated by higher layers whenever the System frame number satisfies the condition (System Frame Number Modulo 4 is zero) SFN%4=0. you may know that PBCH output is 960 complex symbols long and that is divided into 4 parts and each parts are transmitted in consecutive System frames, which can also be seen the diagram, where the first 240 bits goes in SFN-0, the next 240 bits in SFN-1 and so on. Just to note, each individual PBCH are independently decodable, what I mean here is, if the UE finds the PBCH in SFN-0 he can still decode the all contents of MIB without waiting for the parts of the PBCH in coming in next System frame.
Related Posts:
ShareTechnote
MIB(Master Information Block) MIB is special signal that carries the following information. As you see, you can get the System Bandwidth and SFN by decoding MIB. i) DL Bandwidth, Number of Transmit Antenna ii) System Frame Number (SFN) iii) PHICH Configuration iv) Transmit every 40 ms , repeat every 10 ms MasterInformationBlock ::= SEQUENCE { dl-Bandwidth ENUMERATED { n6, n15, n25, n50, n75, n100}, phich-Config PHICH-Config, systemFrameNumber BIT STRING (SIZE (8)), spare BIT STRING (SIZE (10)) } Following is the cycles in which MIB and SIB is transmitted.
MASTER INFORMATION BLOCK (MIB)
MASTER INFORMATION BLOCK (MIB) is the broadcast information transmitted by eNodeB at periodically. After Decoding the PSS and SSS information UE have the information of Physical cell ID and not it can descramble the further information which Master information Block, which will provide the System bandwidth, Antenna configuration , System frame number.
Bits and Bytes of Master information blocks:
Logical Channel – BCCH (Broadcast common control Channel)
Transport Channel – BCH (Broadcast Channel)
Physical Channel – PBCH (Physical Broadcast channel)
RLC Mode – ™(Transparent Mode)
Size of Master Information Block – 24 Bits
Resource Block Requirement – MIB require 6 RBs (72 subcarriers) in Frequency domain
Location in Resource Grid – 4 symbols of first subframe second slot symbol 0, 1, 2 and 3.
Channel Coding – tail bit convolutional encoding
Rate matching – 1/16 Rate coding (repetition coding)
Modulation – QPSK
Message content of MIB as per 3gpp 36.331
MasterInformationBlock ::= SEQUENCE {
dl-Bandwidth ENUMERATED { n6, n15, n25, n50, n75, n100},
phich-Config PHICH-Config,
systemFrameNumber BIT STRING (SIZE (8)),
spare BIT STRING (SIZE (10))
}
All above content is sent as 24bits binary information and these 21bits can be splitted as below:
3 bits for system bandwidth (000-111 )
3 bits for PHICH information,(1 bit to indicate normal or extended PHICH , 2 bit to indicate the PHICH Ng value)
8 bits for system frame number
10 bits are reserved for future use
Apart from the above information, the MIB CRC also provides the number of transmit antennas used by the eNodeB. The MIB CRC is scrambled with an antenna specific mask.
To get know more about the transmission and Generation of Master Information please read our post on Physical Broadcast channel
Physical Broadcast channel is a physical layer channel and carried the Master Information Block. It is mapped Logical channel as BCCH and Transport channel as BCH. It occupies central 6 RBs (72 Subcarrier) in frequency domain and mapped on 4 symbols of first subframe second slot symbol 0, 1, 2 and 3. PBCH channel uses QPSK modulation.
Below is the
PBCH Transmission :
The MIB information is generated at every 40 ms or we can say after every 4 System frame number and sent to physical layer for encoding. Now Physical layer transmits it at every 10 ms or we can say it broadcast it every system frame number. Physical layer transmits new MIB information only at SFN mode 4=0 and at other SFN is only transmits the redundancy version. The below Picture depict the same. All Dark blue are the New MIB which may or may not change every 40ms and light blue are the RV (Redundant Version) of Original MIB
The MIB payload worth 24 bit is received from upper to physical layer and the physical layer do the following process,
CRC Generation – Here a 16 bit CRC is generated by the CRC module and it is scrambled with a antenna specific mask and same mask is used by UE while find out the antenna configuration.
CRC attachment to MIB – The generated CRC is attached to the MIB payload after which the size of the payload will be 40 bits (24 bit of MIB + 16 bit of CRC)
Convolutional encoding – A tail bit convolutional encoding is performed over the 40 bits and the output is 3 streams of 40 bits each
Rate matching – The rate matching here is nothing but a repetition coding, where the 3 streams of size 120 bits (40×3 bits) is just repeated 16 times to get 1920 bits. The repetition rate is very high since the MIB is a very vital information and the UE cannot afford to lose it.
Scrambling – These 1920 bits are scrambled with a scrambling sequence as long as 1920 bits
Modulation (QPSK) – A QPSK modulation is performed over these 1920 bits to obtain 960 complex QPSK symbols (Symbols = Total no of bits/Bits per Symbol)
This is the basic operation for PBCH encoding, but since the PBCH has to be transmitted every 10 milliseconds on subframe 0 of all radio frames, the PBCH modulation buffer is divided into 4 sub-buffers each as long as 240 complex symbols. Each sub-buffer is transmitted over PBCH and by the time the last sub buffer is transmitted on PBCH, a new MIB is arrived from higher layer which is again encoded using the above method and the process continues
As you see from the above diagram, a new MIB is generated by higher layers whenever the System frame number satisfies the condition (System Frame Number Modulo 4 is zero) SFN%4=0. you may know that PBCH output is 960 complex symbols long and that is divided into 4 parts and each parts are transmitted in consecutive System frames, which can also be seen the diagram, where the first 240 bits goes in SFN-0, the next 240 bits in SFN-1 and so on. Just to note, each individual PBCH are independently decodable, what I mean here is, if the UE finds the PBCH in SFN-0 he can still decode the all contents of MIB without waiting for the parts of the PBCH in coming in next System frame.
Related Posts:
ShareTechnote
MIB(Master Information Block) MIB is special signal that carries the following information. As you see, you can get the System Bandwidth and SFN by decoding MIB. i) DL Bandwidth, Number of Transmit Antenna ii) System Frame Number (SFN) iii) PHICH Configuration iv) Transmit every 40 ms , repeat every 10 ms MasterInformationBlock ::= SEQUENCE { dl-Bandwidth ENUMERATED { n6, n15, n25, n50, n75, n100}, phich-Config PHICH-Config, systemFrameNumber BIT STRING (SIZE (8)), spare BIT STRING (SIZE (10)) } Following is the cycles in which MIB and SIB is transmitted.
Master Information Block in LTE
After initial synchronization of UE with the network, it starts to receive information blocks where the first and most essential one is Master Information Block. It carries less, but important information to UE from the network. MIB (Master Information Block) is transmitted through BCCH –> BCH –> PBCH channels and PBCH occupies 6 PRB in OFDMA system where MIB can use these channels for transmission.
Used symbols by MIB in OFDMA, first “4 symbols” of the second time-slot of first sub-frame.
MIB is always sent in sub-frame #0 of the Radio-Frame, and continues re-transmitting the same message in each 10 ms with different redundancy versions. Each 40ms a new MIB is transmitted.
Carried information by MIB:
Downlink Channel Bandwidth:
• Number of PRB: 6, 15, 25, 50, 75, 100.
PHICH configuration:
• PHICH Duration: ‘normal’ or ‘extended’
• PHICH Resource: can be 1/6, 1/2, 1, 2.
System Frame Number: eNodeB transmits SFN value through PBCH and UE can synchronize its SFN number from this value.
Long Term Evolution | 4G
MIB or Master Information Block is a very important message or information that is broadcasted by the LTE eNodeB irrespective of any users presence. The MIB is first among the other system information blocks or SIB, which are also broadcasted by the eNodeB.
The MIB is transmitted using a physical layer channel called PBCH or Physical Broadcast Channel on downlink. The MIB is a 24 bit information with following information within,
3 bits for system bandwidth
for system bandwidth 3 bits for PHICH information, 1 bit to indicate normal or extended PHICH 2 bit to indicate the PHICH Ng value
for PHICH information, 8 bits for system frame number
for system frame number 10 bits are reserved for future use
are reserved for future use Apart from the information in the payload, the MIB CRC also conveys the number of transmit antennas used by the eNodeB. The MIB CRC is scrambled or XORed with a antenna specific mask.
Now to talk about significance of each field,
The system bandwidth, as you all know is a must knowledge a UE must have to decode any other physical layer channels
PHICH info, which is nothing but the Ng value (or the number of PHICH groups used in the first symbol) is very important too, because unless the UE knows that, he will not be able to decode PDCCH and hence any DCI. This field also tells UE about the PHICH duration, if it is normal PHICH or extended PHICH, which is also essential for the UE to decode the control channels completely
System frame number is transmitted in the MIB for mainly two reasons, one, for initial sychronization and two for periodic sync that a UE can do to find out any drifts of its timing vs the eNodeB’s timing.
The MIB has two perspectives,
Generation periodicity – The generation periodicity is the duration between two consecutive MIB information generated by the higher layers. This periodicity is 40 milliseconds and the physical layer receives a new MIB for encoding every 40 milliseconds. The system frame number within each MIB will be a rolling number between 0-255 and keeps changing every MIB but other contents may or may not change. Transmission periodicity – The transmission periodicity is the duration between two consecutive PBCH transmission by the physical layer. The physical layer transmits the PBCH for every 10 milliseconds. Although the contents within 4 consecutive PBCH will remain same as the PBCH carries MIB and the MIB can change only after 40 milliseconds since the first PBCH transmission.
PBCH Transmission
The MIB payload worth 24 bit is received from higher layer to physical layer and the physical layer will follow below processes,
CRC Generation – where a 16 bit CRC is generated by the CRC module and it is scrambled with a antenna specific mask CRC attachment to MIB – The generated CRC is attached to the MIB payload after which the size of the payload will be 40 bits (24 bit of MIB + 16 bit of CRC) Convolution encoding – A tail bit convolution encoding is performed over the 40 bits and the output is 3 streams of 40 bits each Rate matching – The rate matching here is nothing but a repetition coding, where the 3 streams of size 120 bits (40x3bits) is just repeated 16 times to get 1920 bits. The repetition rate is very high since the MIB is a very vital information and the UE cannot afford to lose it. Scrambling – These 1920 bits are scrambled with a scrambling sequence as long as 1920 bits Modulation (QPSK) – A QPSK modulation is performed over these 1920 bits to obtain 960 complex QPSK symbols
This is the basic operation for PBCH encoding, but since the PBCH has to be transmitted every 10 milliseconds on subframe 0 of all radio frames, the PBCH modulation buffer is divided into 4 sub-buffers each as long as 240 complex symbols. Each sub-buffer is transmitted in PBCH and by the time the last sub buffer is transmitted on PBCH, a new MIB is arrived from higher layer which is again encoded using the above method and the process continues.
As you see from the above diagram, a new MIB is generated by higher layers whenever the Radio frame number satisfies the condition (Radioframe Number Modulo 4 is zero) RF%4=0. The grey boxes in the diagram are the first subframe of each radio frame or subframe-0. Also you know that PBCH output is 960 complex symbols long and that is divided into 4 parts and each parts are transmitted in consecutive radioframes, which can also be seen the diagram, where the first 240 bits goes in RF-0, the next 240 bits in RF-1 and so on. Just to note, each individual PBCH are independently decodable, what I mean here is, if the UE finds the PBCH in RF-0 he can still decode the all contents of MIB without waiting for the parts of the PBCH in coming in next radioframes.
Significance of MIB for UE
MIB is a very crucial information that a UE need to acquire before it can start any transaction with the eNodeB because it know all the vital information in the MIB as explained above and also it will come to know the 40 millisecond boundary from the decoded MIB. The System frame number transmitted within the PBCH will remain same for 4 radio frames, because of the same fact that 4 consecutive radio frames are transmitted the same MIB information. Now for a UE to know the 40 millisecond boundary, all it has to find is 4 consecutive system frame numbers that are same. Now from the same diagram, RF-0 to RF-3 will have same system frame number within.
So for the best case, if the UE starts decoding the MIB from RF-0 it will see same system frame number for 4 consecutive radio frames and it will understand that RF-0 is the 40 millisecond boundary. For the worst case, if UE decodes RF-1 first then he will see same system frame numbers in RF-1, RF-2, RF-3 and a different one in RF-4 so he continues decoding the PBCH till RF-5, RF-6 & RF-7 and he sees a same system frame number from RF-4 to RF-7 and hence decides that RF-4 is the 40 millisecond boundary.
So from system point of view, a UE can decode the MIB & 40 millisecond boundary in 40 milliseconds for the best case and 70 milliseconds for the worst case, considering the latency start count from the time RF-0 was transmitted.
So this is all about the MIB & PBCH. Please feel free to ask any questions or clarifications or even corrections.
——Pradeep Prabhu——
LTE system information blocks-MIB,SIB-1,2,3,4,5,6,7,8,9,10,11
LTE system information blocks-MIB,SIB-1,2,3,4,5,6,7,8,9,10,11
The system information is very essential and the same is broadcasted by LTE eNB over logical channel BCCH. This logical channel information is further carried over transport channel BCH or carried by DL-SCH.
There are two parts in SI static part and dynamic part. Static part is called as MIB and is transmitted using BCH and carried by PBCH once every 40ms. MIB carries useful information which includes channel bandwidth, PHICH configuration details; transmit power, no. of antennas and SIB scheduling information transmitted along with other information on the DL-SCH.
Dynamic part is called as SIB and is mapped on RRC SI messages(SI-1,2,3,4,5,6,7,8,9,10,11) over DL-SCH and transmitted using PDSCH at periodic intervals. SI-1 transmitted every 80ms, SI-2 every 160ms and SI-3 every 320 ms.
System Information Blocks are grouped in SI containers. Each SI is composed of multiple SIBs. Each SI usually will have different transmission frequency and will be sent in a single sub-frame. SIBs are transmitted using BCCH mapped on DL-SCH which in turn mapped on PDSCH.
System information will be changed every BCCH modification period. Signalling Tester model MD8430A from Anritsu can be used as LTE Base Station Emulator. This will emulate LTE MIBs and SIBs over corresponding LTE channels.
LTE system information blocks Description MIB Carries physical layer information of LTE cell which in turn help receive further SIs, i.e. system bandwidth SIB1 Contains information regarding whether or not UE is allowed to access the LTE cell. It also defines the scheduling of the other SIBs. carries cell ID, MCC, MNC, TAC, SIB mapping. SIB2 Carries common channel as well as shared channel information. It also carries RRC, uplink power control, preamble power ramping, uplink Cyclic Prefix Length, sub-frame hopping, uplink EARFCN SIB3 carries cell re-selection information as well as Intra frequency cell re-selection information SIB4 carries Intra Frequency Neighbors(on same frequency); carries serving cell and neighbor cell frequencies required for cell reselection as well handover between same RAT base stations(GSM BTS1 to GSM BTS2) and different RAT base stations(GSM to WCDMA or GSM to LTE or between WCDMA to LTE etc.) . Covers E-UTRA and other RATs as mentioned SIB5 Carries Inter Frequency Neighbors(on different frequency); carries E-UTRA LTE frequencies, other neighbor cell frequencies from other RATs. The purpose is cell reselection and handover. SIB6 carries WCDMA neighbors information i.e. carries serving UTRA and neighbor cell frequencies useful for cell re-selection SIB7 carries GSM neighbours information i.e. Carries GERAN frequencies as well as GERAN neighbor cell frequencies. It is used for cell re-selection as well as handover purpose. SIB8 carries CDMA-2000 EVDO frequencies, CDMA-2000 neighbor cell frequencies. SIB9 carries HNBID (Home eNodeB Identifier) SIB10 carries ETWS prim. notification SIB11 carries ETWS sec. notification
LTE System Information Block (SIB) Contents
Following dropdown menu will help one browse through all the LTE system information block contents. It covers LTE SIB-1, SIB-2, SIB-3, SIB-4, SIB-5, SIB-6, SIB-7, SIB-8, SIB-9, SIB-10 and LTE SIB-11.
LTE SIB-1 Contents LTE SIB-2 Part1 Contents LTE SIB-2 Part2 Contents LTE SIB-2 Part3 Contents LTE SIB-3 Contents LTE SIB-4 Contents LTE SIB-5 Contents LTE SIB-6 Contents LTE SIB-7 Contents LTE SIB-8 Part1 Contents LTE SIB-8 Part2 Contents LTE SIB-9 Contents LTE SIB-10 Contents LTE SIB-11 Contents LTE MIB Contents If you can see this, your browser does not support iframes!
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MIB : Master Information Block
Master Information Block
Direction: gnB=> UE
Signalling Radio Bearer: N/A
RLC-SAP: TM
Logical Channel: BCCH
Transport Channel: BCH
The MASTER INFORMATION BLOCK (MIB) includes a limited number of most essential and most frequently transmitted parameters that are needed to acquire other information from the cell. The MIB is transmitted on BCH while all other SYSTEM INFORMATION messages are transmitted on DL-SCH
The MIB is always transmitted on the BCH with a periodicity of 80ms and repetitions within 80ms.
It includes parameters that are needed to acquire SIB1 from the cell.
The first transmission of the MIB is scheduled in subframes as defined, and repetitions are scheduled according to the period of the SSB.
The Master information Block (MIB) is transmitted using BCCH logical channel, the BCH transport channel and the PBCH Physical Channel
The MIB & SIB1 are known as” Minimum system information ” because these parameters are the basic parameters which is important for initial access and acquiring any other system information block
MIB Bits systemFrameNumber BIT STRING 6 subCarrierSpacingCommon scs15or60, scs30or120 1 ssb-SubcarrierOffset 0..15 4 dmrs-TypeA-Position pos2, pos3 1 pdcch-ConfigSIB1 Control resourcesetzero 4 cellBarred barred, notBarred 1 intraFreqReselection allowed, notAllowed 1 Spare BIT STRING 1 pdcch-ConfigSIB1 Search space zero 4
Actions upon reception of the MIB:
Upon receiving the MIB the UE shall:
1> store the acquired MIB;
1> if the UE is in RRC_IDLE or in RRC_INACTIVE, or if the UE is in RRC_CONNECTED while T311 is running:
2> if the cellBarred in the acquired MIB is set to barred:
3> consider the cell as barred in accordance with TS 38.304 [20];
3> if intraFreqReselection is set to notAllowed:
4> consider cell re-selection to other cells on the same frequency as the barred cell as not allowed, as specified in TS 38.304 [20].
3> else:
4> consider cell re-selection to other cells on the same frequency as the barred cell as allowed, as specified in TS 38.304 [20].
2> else:
3> apply the received systemFrameNumber, pdcch-ConfigSIB1, subCarrierSpacingCommon, ssb-
SubcarrierOffset and dmrs-TypeA-Position.
systemFrameNumber :
The 6 most significant bits (MSB) of the 10-bit System Frame Number (SFN). The 4 LSB of the SFN are conveyed in the PBCH transport block as part of channel coding (i.e. outside the MIB encoding),
subCarrierSpacingCommon :
one: Subcarrier spacing for SIB1, Msg.2/4 for initial access, paging and broadcast SI-messages. If the UE acquires this MIB on an FR1 carrier frequency, the value scs15or60 corresponds to 15 kHz and the value scs30or120 corresponds to 30 kHz.
Tow: Subcarrier spacing for SIB1, Msg.2/4 for initial access, paging and broadcast SI-messages. If the UE acquires this MIB on an FR1 carrier frequency, the value scs15or60 corresponds to 15 kHz and the value scs30or120 corresponds to 30 kHz.
ssb-SubcarrierOffset
Corresponds to kSSB which is the frequency domain offset between SSB and the overall resource block grid in number of subcarriers. The value range of this field may be extended by an additional most significant bit encoded within PBCH.
This field may indicate that this cell does not provide SIB1 and that there is hence no CORESET#0 configured in MIB ). In this case, the field pdcch-ConfigSIB1 may indicate the frequency positions, where the UE may (not) find a SS/PBCH with a control resource set and search space for SIB1.
pdcch-ConfigSIB1 :
Determines a common ControlResourceSet (CORESET), a common search space and necessary PDCCH parameters. If the field ssb-SubcarrierOffset indicates that SIB1 is absent, the field pdcch-ConfigSIB1 indicates the frequency positions where the UE may find SS/PBCH block with SIB1 or the frequency range where the network does not provide SS/PBCH block with SIB1.
dmrs-TypeA-Position :
Position of (first) DM-RS for downlink
intraFreqReselection :
Controls cell selection/reselection to intra-frequency cells when the highest ranked cell is barred, or treated as barred by the UE
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LTE System Information Block
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LTE system information is one of the key aspects of the air interface. It consists of the Master Information Block (MIB) and a number of System Information Blocks (SIBs). The MIB is broadcast on the Physical Broadcast Channel (PBCH), while SIBs are sent on the Physical Downlink Shared Channel (PDSCH) through Radio Resource Control (RRC) messages. SIB1 is carried by “SystemInformationBlockType 1” message. SIB2 and other SIBs are carried by “SystemInformation (SI)” message. An SI message can contain one or several SIBs. 1. The MIB is the first thing a UE looks for after it achieves downlink synchronization. The MIB carries the most essential information that is needed for the UE to acquire other information from the cell. It includes:
The downlink channel bandwidth The PHICH configuration. The Physical Hybrid ARQ Indicator Channel carries the HARQ ACKs and NACKs for uplink transmissions The SFN (System Frame Number) which helps with synchronization and acts as a timing reference The eNB transmit antenna configuration specifying the number of transmit antennas at eNB such as 1, 2, or 4, which is carried by CRC mask for PBCH
2. SIB1 is carried in a SystemInformationBlockType1 message. It includes information related to UE cell access and defines the schedules of other SIBs, such as:
3.
The PLMN Identities of the network The tracking area code (TAC) and cell ID The cell barring status, to indicate if a UE may camp on the cell or not q-RxLevMin, which indicates the minimum required Rx Level in the cell to fulfill the cell selection criteria The transmissions times and periodicities of other SIBs SIB2 contains radio resource configuration information common for all UEs, including:
The uplink carrier frequency and the uplink channel bandwidth (in terms of the number of Resource Blocks, for example n25, n50) The Random Access Channel (RACH) configuration, which helps a UE start the random access procedure, such as preamble information, transmit time in terms of frame and subframe number (prach-ConfigInfo), and powerRampingParameters which indicates the initial Tx power and ramping step. The paging configuration, such as the paging cycle The uplink power control configuration, such as P0-NominalPUSCH/PUCCH The Sounding Reference Signal configuration The Physical Uplink Control Channel (PUCCH) configuration to support the transmission of ACK/NACK, scheduling requests, and CQI reports The Physical Uplink Shared Channel (PUSCH) configuration, such as hopping
4. SIB3 contains information common for intra-frequency, inter-frequency, and/or inter-RAT cell reselection. This information does not necessarily apply to all scenarios; please refer to 3GPP TS 36.304 for the details. The basic parameters include:
s-IntraSearch: the threshold for starting intra-frequency measurement. When s-ServingCell (i.e., cell selection criterion for serving cell) is higher than s-IntraSearch, the UE may choose not to perform measurement in order to save battery life. s-NonIntraSearch: the threshold for starting inter-frequency and IRAT measurements q-RxLevMin: the minimum required Rx level in the cell Cell reselection priority: the absolute frequency priority for E-UTRAN or UTRAN or GERAN or CDMA2000 HRPD or CDMA2000 1xRTT q-Hyst: the hysteresis value used for calculating the cell-ranking criteria for the serving cell, based on RSRP. t-ReselectionEUTRA: the cell reselection timer value for EUTRA. t-ReselectionEUTRA and q-Hyst can be configured to trigger cell reselection sooner or later.
5. SIB4 contains the intra-frequency neighboring cell information for Intra-LTE intra-frequency cell reselection, such as neighbor cell list, black cell list, and Physical Cell Identities (PCIs) for Closed Subscriber Group (CSG). CSG can be used to support Home eNBs. 6. SIB5 contains the neighbor cell related information for Intra-LTE inter-frequency cell-reselection, such as neighbor cell list, carrier frequency, cell reselection priority, threshold used by the UE when reselecting a higher/lower priority frequency than the current serving frequency, etc. (Note that 3GPP states that LTE neighbor cell search is feasible without providing an explicit neighbor list. Since the UE can do blind detection of neighbor cells in LTE, the broadcast of LTE neighbor cells is optional.) In E-UTRAN, SIBs 6, 7, 8 carry information for IRAT cell reselection to UTRAN, GERAN, and CDMA2000 systems respectively. SIB 1 and SIB 3 also carry IRAT related information. 7.
SIB6 contains information for IRAT cell reselection to UTRAN, such as:
Carrier frequency List: a list of neighboring UTRAN carrier frequencies Cell reselection priority: the absolute priority Q_RxLevMin: the minimum required Rx level ThreshX-high/ThreshX-low: threshold used by the UE when reselecting a higher/lower priority frequency than the current serving frequency T-ReselectionURTA: cell reselection timer value for UTRAN Speed dependent reselection parameters
In UTRAN, the IRAT related information is broadcasted in SIBs 6, 18, 19, as well as SIBs 3 and 4. SIB 19 is new to 3GPP Release 8. 8.
SIB7 contains information for IRAT cell reselection to GERAN, such as:
Carrier Frequency Info List: a list of neighboring GERAN carrier frequencies Cell reselection priority: the absolute priority Q_RxLevMin: the minimum required Rx level ThreshX-high/ThreshX-low: threshold used by the UE when reselecting a higher/lower priority frequency than the current serving frequency T-ReselectionGERA: cell reselection timer value for GERAN Speed dependent reselection parameter
In GSM/GERAN, system information from second quarter is modified in 3GPP Release 8 to include LTE-related cellreselection parameters. 9. SIB8 contains information for IRAT cell reselection to eHRPD (evolved High Rate Packet Data, which is the 1xEV-DO Rev.A with the support of connectivity to Evolved Packet Core of LTE), such as:
Information for searching eHRPD: carrier frequencies, system time info for PN synchronization, and the search window size Pre-registration info for eHRPD (optional): required or not. The pre-registration procedure intends to minimize the service interruption time and accelerate the handover by allowing the UE to pre-register with the CDMA 2000 eHRPD system when the UE is still connected with the E-UTRAN. When the UE is connected to eHRPD, it may also pre-register with E-UTRAN. The pre-registration may happen well ahead of the actual handover. The registration Zone ID is also given (eHRPD or 1xEV-DO Sessions belong to an RNC and hence apply to certain zones). Cell reselection thresholds and parameters: ThreshX-high, ThreshX-low, T-reselectionCDMA2000, Speed dependent reselection parameter. The E-UTRAN can prioritize the selection of the technology by the UE by setting the cell reselection parameters properly. Neighbor cell list for monitoring potential eHRPD target cells.
10. SIB9 contains a Home eNB name. The home eNB is the femto-cell in the context of LTE, a small base station used in residential area or by small businesses. 11. SIB10 is for an ETWS (Earthquake and Tsunami Warning System) primary notification. ETWS is a public warning system. The paging procedure is used to inform the ETWS capable UEs in RRC idle and RRC connected modes to listen to SIB10 and SIB11. 12. SIB11 is for an ETWS secondary notification
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