LTE Radio Protocol Stack_A3_Size
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PBCH PCFICH PHICH PDCCH PMCH PDSCH PUSCH PUCCH PRACH DL-SCH DCI HI CFI MCH BCH PCH RACH UCI UL-SCH DTCH CCCH DCCH BCCH PCCH CCCH DCCH MCCH MTCH DTCH TM TM TM UM AM UM AM Integrity Ciphering Ciphering optional ROHC RRC AM Integrity Ciphering UM UM AM Ciphering optional ROHC TM SRB0 SRB1 SRB2 SRB0 SRB1 SRB2 RRC SM GMM MM IP SM GMM MM UDP TCP UDP TCP PHY MAC RLC PDCP RRC PHY MAC RLC PDCP RRC IP IP IP IP Applications Applications NAS NAS CONTROL PLANE CONTROL PLANE USER PLANE USER PLANE DRB DRB DRB DRB L1 L2 L3 L1 L2 L3 Physical Channels Physical Channels Transport Channels Transport Channels Logical Channels Logical Channels RLC Mode RLC Mode Radio Bearers Radio Bearers The Physical Broadcast Channel carries the Master Information Block (MIB). It consists of a limited number of the most frequently transmitted parameters essential for initial access to the cell. The PBCH is designed for early detection by the UE, and cell-wide coverage The Physical Downlink Shared Channel is the main downlink data-bearing channel in LTE, used for all user data, as well as for broadcast system information which is not carried on the Physical Broadcast Channel (PBCH). It is also used for paging messages. The Physical Control Format Indicator Channel is a downlink physical channel that carries a Control Format Indicator (CFI) which indicates the number of OFDM symbols (i.e. normally 1, 2 or 3) used for transmission of downlink control channel information in each sub-frame. Physical Downlink Control Channel in LTE carries UE-specific scheduling assignments for DL resource allocation, UL grants, PRACH responses, UL power control commands, and common scheduling assignments for signaling messages (such as system information, paging, etc.). The Physical Hybrid ARQ Indicator Channel is a downlink physical channel that carries the Hybrid ARQ (HARQ) ACK/NACK information indicating whether the eNB has correctly received a transmission on the PUSCH. Multiple PHICHs (for different UEs) are mapped to the same set of downlink resource elements. Physical Multicast Channel : For transmission of multicast and broadcast information, Format is similar to the PDSCH but it is for reception by several mobiles, Sub-channel spacing is 7.5 kHz and symbol length is doubled, Modulation QPSK, 16 QAM or 64 QAM Physical Uplink Shared Channel: This channel is used to carry RRC signaling messages. Uplink RRC messages are carried using PUSCH. LTE PUSCH channel contain user information data. The PUSCH carries both user data as well as control signal data. Physical Uplink Control Channel: This LTE channel is used to carry UCI. UCI can also be transported using PUSCH channel. An LTE UE can never transmits both PUCCH and PUSCH during the same sub-frame. If UE has application data then UCI is carried over PUSCH. If UE does not have data UCI is carried over PUCCH. Physical Random Access Channel: This channel is used to carry random access preambles used for initiation of random access procedure. Paging Control Channel : A downlink channel that transfers paging information and system information change notifications. This channel is used for paging when the network does not know the location cell of the UE. Broadcast Control Channel (BCCH) : This control channel provides system information to all mobile terminals connected to the eNodeB.It allows the UE to retrieve cell and network configuration parameters (e.g. PLMN code, cell identity, cell reselection parameters, etc.) required for normal operation within EUTRAN. Common Control Channel: RRC signaling channel used by UEs to do the initial access signaling when it is in RRC_IDLE state and wants to enter RRC_CONNECTED state. The UE will send only one message (RRC CONNECTION REQUEST) and the rest of the communication takes place on DCCH. Dedicated Control Channel: This control channel is used for carrying user-specific control information, e.g. for controlling actions including power control, handover, etc.. Dedicated Traffic Channel: The DTCH is used for user radio bearers carrying IP traffic. The eNB connects DTCHs with their associated S1-U tunnel to the SAE GW. DTCH can be bidirectional, uplink only or downlink only. DTCH are of course point-to- point. Multicast Control Channel: The MCCH is associated with MBMS. It allows the eNB to inform UEs that want to listen to broadcast or multicast service traffic about availability of such services and about the associated MBMS radio bearer (point-to-multipoint) radio bearers. Multicast Traffic Channel: The MTCH is a point-to-multipoint traffic channel for MBMS. It carries IP traffic for broadcast or multicast services driven by the MBMS feature. Paging Channel: Associated with the PCCH logical channel. It is mapped to dynamically allocated physical resources, and is required for broadcast over the entire cell coverage area. It is transmitted on the Physical Downlink Shared Channel Broadcast Channel: A downlink channel associated with the BCCH logical channel and is used to broadcast system information over the entire coverage area of the cell. It has a fixed transport format defined by the specifications. Downlink Shared Channel: Used for transmitting the downlink data, including both control and traffic data, and thus it is associated with both logical control and logical traffic channels. Random Access Channel: A specific transport channel that is not mapped to any logical channel. It transmits relatively small amounts of data for initial access or, in the case of RRC, state changes. Multicast Channel: Associated with MCCH and MTCH logical channels for the multicast/ broadcast service. It supports Multicast/ Broadcast Single Frequency Network (MBSFN) transmission, which transmits the same information on the same radio resource from multiple synchronized base stations to multiple UEs. Uplink Shared Channel: The uplink counterpart of the DL-SCH. It can be associated to CCCH, DCCH, and DTCH logical channels. It supports H-ARQ, dynamic link adaption, and dynamic and semi-persistent resource allocation. Downlink Control Information: It carries information related to downlink/uplink scheduling assignment, modulation and coding scheme, and Transmit Power Control (TPC) command, and is sent over the Physical Downlink Control Channel (PDCCH). The DCI supports 10 different formats. Control Format Indicator: It indicates how many symbols the DCI spans in that sub- frame. It takes values CFI = 1, 2, or 3, and is sent over the Physical Control Format Indicator Channel (PCFICH). TM is the simplest RLC mode. TM stands for 'Transparent Mode'. The term 'Transparent' may have many different meaning. In this case, it would mean 'the contents goes through this layer without any modification'. Most complicated RLC type. 'AM' stands for 'Acknowledge Mode'. As it's name implies it requires ACK/NACK from the other party. It is more like TCP packet in IP world, whereas RLC UM is more like UDP in IP world. UM stands for 'Unacknowledged Mode'. 'UM' means 'it does not require any reception response from the other party'. 'Reception response' simply mean 'ACK' or 'NACK' from the other party. (UM mode is similar to TM mode in that it does not require any ACK/ NACK from the other party). Both signaling radio bearers are used to transmit/receive LTE signaling messages. SRB2 is used specifically for NAS signaling messages but if SRB2 is not at all present or established, SRB1 is used to trans/receive NAS messages. Data Radio Bearer: to carry user data. Data radio bearer transports the packets of an EPS bearer between a UE and an eNedeB. Robust Header Compression is a standardized method to compress the IP, UDP, UDP-Lite, RTP, and TCP headers of Internet packets. Integrity Protection applies only to C-Plane data (C-Plane data means RRC/NAS message, i.e DCCH data, not DTCH data). Ciphering Protection applies both C-Plane and U-Plane Data. TCP (Transmission Control Protocol) is the most commonly used protocol on the Internet. The reason for this is because TCP offers error correction. When the TCP protocol is used there is a "guaranteed delivery." This is due largely in part to a method called "flow control." Flow control determines when data needs to be re-sent, and stops the flow of data until previous packets are successfully transferred. This works because if a packet of data is sent, a collision may occur. When this happens, the client re-requests the packet from the server until the whole packet is complete and is identical to its original. UDP (User Datagram Protocol) is anther commonly used protocol on the Internet. However, UDP is never used to send important data such as webpages, database information, etc; UDP is commonly used for streaming audio and video. Streaming media such as Windows Media audio files (.WMA) , Real Player (.RM), and others use UDP because it offers speed! The reason UDP is faster than TCP is because there is no form of flow control or error correction. The data sent over the Internet is affected by collisions, and errors will be present. Remember that UDP is only concerned with speed. This is the main reason why streaming media is not high quality. H-ARQ Indicator: It carries H-ARQ acknowledgment in response to uplink transmissions, and is sent over the Physical Hybrid ARQ Indicator Channel (PHICH). HI = 1 for a positive acknowledgment (ACK) and HI = 0 for a negative acknowledgment (NAK). Uplink Control Information: It is for measurement indication on the downlink transmission, scheduling request of uplink, and the H-ARQ acknowledgment of downlink transmissions. The UCI can be transmitted either on the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel. Application IP PDCP RLC MAC PHY PDCP RLC MAC PHY L2 L1 GTP-U UDP/IP IP Sec L1 L2 L1 GTP-U UDP/IP IP Sec GTP-U UDP/IP IP Sec L2 L1 L2 L1 IP Services GTP-U UDP/IP IP Sec L2 NAS RRC PDCP RLC MAC PHY NAS S1-AP SCTP IP L2 L1 RRC PDCP RLC MAC PHY S1-AP SCTP IP L2 L1 UE eNodeB S-GW P-GW UE eNodeB MME User Plane Control plane Uu S1-MME Uu S1-U S5/S8 SGi LTE Radio Protocol Stack Prepared by Ziya Akhundov Relay Relay Relay PUSCH PMCH PHICH PDCCH PCFIC H PDSCH PBCH TM AM UM SRB DRB ROHC Integri ty Cipher ing CFI DCI UL- SCH MCH RACH DL- SCH BCH BCCH CCCH DCCH DTCH MCCH MTCH PRACH HI UDP TCP PCH PUCCH UCI PCCH HARQ,CRC, Coding, De-Scrambling, De-Modulation, Measurement, Resource Element De-Mapping, MIMO Channel Mapping, De-Multiplexing, Handling Control Elements, HARQ, DRX HARQ,CRC, Coding, Scrambling, Modulation, Measurement, Resource Element Mapping, MIMO Channel Mapping, Multiplexing, Handling Control Elements, HARQ, Random Access Procedure, Logical Channel Priority, Sending BSR Re-Ordering, Reassembly, ARQ (for AM mode) Buffer Status Report, Segment & Concatenation, ARQ (for AM mode) In Sequence Delivery, Duplicate Packet Detection, Integrity Validation, De- ciphering, Header-Decompression Sequence Number Addition, Hand Over Data Handling, Integrity Protection, Ciphering, Header- Compression Mobility Management, Configuration Management, Connection Management, Paging Control, Security Management, Broadcast, Measurement Configuration, Measurement Reporting, Cell Selection/Reselection Mobility Management, Configuration Management, Connection Management, Paging Control, Security Management, Broadcast, Measurement Configuration, Measurement Reporting, Cell Selection/Reselection Mobility Management, Session Management, Bearer Management, Paging Control, Security Management Mobility Management, Session Management, Bearer Management, Paging Control, Security Management
description
LTE Radio Protocol Stack
Transcript of LTE Radio Protocol Stack_A3_Size
PBCH PCFICH PHICHPDCCH PMCHPDSCH PUSCH PUCCH PRACH
DL-SCH DCI HICFI MCHBCHPCH RACHUCIUL-SCH
DTCH CCCH DCCHBCCHPCCH CCCH DCCH MCCH MTCHDTCH
TM TM TM UM AM UM AM
Integrity
CipheringCiphering optional
ROHC
RRC
AM
Integrity
Ciphering
UMUM AM
Ciphering optional
ROHC
TM
SRB0 SRB1 SRB2 SRB0 SRB1 SRB2
RRC
SM GMM MM IP SM GMM MMUDP TCP UDPTCP
PHY
MAC
RLC
PDCP
RRC
PHY
MAC
RLC
PDCP
RRCIP IP
IP IP
Applications ApplicationsNAS NAS
CONTROL PLANE CONTROL PLANEUSER PLANE USER PLANE
DRB DRB DRB DRB
L1
L2
L3
L1
L2
L3
Physical Channels Physical Channels
Transport Channels Transport Channels
Logical ChannelsLogical Channels
RLC Mode RLC Mode
Radio Bearers Radio Bearers
The Physical Broadcast Channel carries the Master Information Block (MIB). It consists of a limited number of the most frequently transmitted parameters essential for initial access to the cell. The PBCH is designed for early detection by the UE, and cell-wide coverage
The Physical Downlink Shared Channel is the main downlink data-bearing channel in LTE, used for all user data, as well as for broadcast system information which is not carried on the Physical Broadcast Channel (PBCH). It is also used for paging messages.
The Physical Control Format Indicator Channel is a downlink physical channel that carries a Control Format Indicator (CFI) which indicates the number of OFDM symbols (i.e. normally 1, 2 or 3) used for transmission of downlink control channel information in each sub-frame.
Physical Downlink Control Channel in LTE carries UE-specific scheduling assignments for DL resource allocation, UL grants, PRACH responses, UL power control commands, and common scheduling assignments for signaling messages (such as system information, paging, etc.).
The Physical Hybrid ARQ Indicator Channel is a downlink physical channel that carries the Hybrid ARQ (HARQ) ACK/NACK information indicating whether the eNB has correctly received a transmission on the PUSCH. Multiple PHICHs (for different UEs) are mapped to the same set of downlink resource elements.
Physical Multicast Channel : For transmission of multicast and broadcast information, Format is similar to the PDSCH but it is for reception by several mobiles, Sub-channel spacing is 7.5 kHz and symbol length is doubled, Modulation QPSK, 16 QAM or 64 QAM
Physical Uplink Shared Channel: This channel is used to carry RRC signaling messages. Uplink RRC messages are carried using PUSCH. LTE PUSCH channel contain user information data. The PUSCH carries both user data as well as control signal data.
Physical Uplink Control Channel: This LTE channel is used to carry UCI. UCI can also be transported using PUSCH channel. An LTE UE can never transmits both PUCCH and PUSCH during the same sub-frame. If UE has application data then UCI is carried over PUSCH. If UE does not have data UCI is carried over PUCCH.
Physical Random Access Channel: This channel is used to carry random access preambles used for initiation of random access procedure.
Paging Control Channel : A downlink channel that transfers paging information and system information change notifications. This channel is used for paging when the network does not know the location cell of the UE.
Broadcast Control Channel (BCCH) : This control channel provides system information to all mobile terminals connected to the eNodeB.It allows the UE to retrieve cell and network configuration parameters (e.g. PLMN code, cell identity, cell reselection parameters, etc.) required for normal operation within EUTRAN.
Common Control Channel: RRC signaling channel used by UEs to do the initial access signaling when it is in RRC_IDLE state and wants to enter RRC_CONNECTED state. The UE will send only one message (RRC CONNECTION REQUEST) andthe rest of the communication takes place on DCCH.
Dedicated Control Channel: This control channel is used for carrying user-specific control information, e.g. for controlling actions including power control, handover, etc..
Dedicated Traffic Channel: The DTCH is used for user radio bearers carrying IP traffic. The eNB connects DTCHs with their associated S1-U tunnel to the SAE GW. DTCH can be bidirectional, uplink only or downlink only. DTCH are of course point-to-point.
Multicast Control Channel: The MCCH is associated with MBMS. It allows the eNB to inform UEs that want to listen to broadcast or multicast service traffic about availability of such services and about the associated MBMS radio bearer (point-to-multipoint) radio bearers.
Multicast Traffic Channel: The MTCH is a point-to-multipoint traffic channel for MBMS. It carries IP traffic for broadcast or multicast services driven by the MBMS feature.
Paging Channel: Associated with the PCCH logical channel. It is mapped to dynamically allocated physical resources, and is required for broadcast over the entire cell coverage area. It is transmitted on the Physical Downlink Shared Channel
Broadcast Channel: A downlink channel associated with the BCCH logical channel and is used to broadcast system information over the entire coverage area of the cell. It has a fixed transport format defined by the specifications.
Downlink Shared Channel: Used for transmitting the downlink data, including both control and traffic data, and thus it is associated with both logical control and logical traffic channels.
Random Access Channel: A specific transport channel that is not mapped to any logical channel. It transmits relatively small amounts of data for initial access or, in the case of RRC, state changes.
Multicast Channel: Associated with MCCH and MTCH logical channels for the multicast/broadcast service. It supports Multicast/Broadcast Single Frequency Network (MBSFN) transmission, which transmits the same information on the same radio resource from multiple synchronized base stations to multiple UEs.
Uplink Shared Channel: The uplink counterpart of the DL-SCH. It can be associated to CCCH, DCCH, and DTCH logical channels. It supports H-ARQ, dynamic link adaption, and dynamic and semi-persistent resource allocation.
Downlink Control Information: It carries information related to downlink/uplink scheduling assignment, modulation and coding scheme, and Transmit Power Control (TPC) command, and is sent over the Physical Downlink Control Channel (PDCCH). The DCI supports 10 different formats.
Control Format Indicator: It indicates how many symbols the DCI spans in that sub-frame. It takes values CFI = 1, 2, or 3, and is sent over the Physical Control Format Indicator Channel (PCFICH).
TM is the simplest RLC mode. TM stands for 'Transparent Mode'. The term 'Transparent' may have many different meaning. In this case, it would mean 'the contents goes through this layer without any modification'.
Most complicated RLC type. 'AM' stands for 'Acknowledge Mode'. As it's name implies it requires ACK/NACK from the other party. It is more like TCP packet in IP world, whereas RLC UM is more like UDP in IP world.
UM stands for 'Unacknowledged Mode'. 'UM' means 'it does not require any reception response from the other party'. 'Reception response' simply mean 'ACK' or 'NACK' from the other party. (UM mode is similar to TM mode in that it does not require any ACK/NACK from the other party).
Both signaling radio bearers are used to transmit/receive LTE signaling messages. SRB2 is used specifically for NAS signaling messages but if SRB2 is not at all present or established, SRB1 is used to trans/receive NAS messages.
Data Radio Bearer: to carry user data. Data radio bearer transports the packets of an EPS bearer between a UE and an eNedeB.
Robust Header Compression is a standardized method to compress the IP, UDP, UDP-Lite, RTP, and TCP headers of Internet packets.
Integrity Protection applies only to C-Plane data (C-Plane data means RRC/NAS message, i.e DCCH data, not DTCH data).
Ciphering Protection applies both C-Plane and U-Plane Data.
TCP (Transmission Control Protocol) is the most commonly used protocol on the Internet. The reason for this is because TCP offers error correction. When the TCP protocol is used there is a "guaranteed delivery." This is due largely in part to a method called "flow control." Flow control determines when data needs to be re-sent, and stops the flow of data until previous packets are successfully transferred. This works because if a packet of data is sent, a collision may occur. When this happens, the client re-requests the packet from the server until the whole packet is complete and is identical to its original.
UDP (User Datagram Protocol) is anther commonly used protocol on the Internet. However, UDP is never used to send important data such as webpages, database information, etc; UDP is commonly used for streaming audio and video. Streaming media such as Windows Media audio files (.WMA) , Real Player (.RM), and others use UDP because it offers speed! The reason UDP is faster than TCP is because there is no form of flow control or error correction. The data sent over the Internet is affected by collisions, and errors will be present. Remember that UDP is only concerned with speed. This is the main reason why streaming media is not high quality.
H-ARQ Indicator: It carries H-ARQ acknowledgment in response to uplink transmissions, and is sent over the Physical Hybrid ARQ Indicator Channel (PHICH). HI = 1 for a positive acknowledgment (ACK) and HI = 0 for a negative acknowledgment (NAK).
Uplink Control Information: It is for measurement indication on the downlink transmission, scheduling request of uplink, and the H-ARQ acknowledgment of downlink transmissions. The UCI can be transmitted either on the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel.
Application
IP
PDCP
RLC
MAC
PHY
PDCP
RLC
MAC
PHY
L2
L1
GTP-U UDP/IP
IP Sec
L1
L2
L1
GTP-U UDP/IP
IP Sec
GTP-U UDP/IP
IP Sec
L2
L1
L2
L1
IP Services
GTP-U UDP/IP
IP Sec
L2
NAS
RRC
PDCP
RLC
MAC
PHY
NAS
S1-AP
SCTP
IP
L2
L1
RRC
PDCP
RLC
MAC
PHY
S1-AP
SCTP
IP
L2
L1
UE eNodeB S-GW P-GW
UE eNodeB MME
Use
r Pla
neCo
ntro
l pla
ne
Uu S1-MME
Uu S1-U S5/S8 SGi
LTE Radio Protocol Stack
Prepared by Ziya Akhundov
Relay Relay
Relay
PUSCH
PMCH
PHICH
PDCCH
PCFICH
PDSCH
PBCHTM
AM
UM
SRB
DRB
ROHC
Integrity
Ciphering
CFI
DCI
UL-SCH
MCH
RACH
DL-SCH
BCHBCCH
CCCH
DCCH
DTCH
MCCH
MTCH
PRACH
HI
UDP
TCP
PCH
PUCCH
UCI
PCCH
HARQ,CRC, Coding, De-Scrambling, De-Modulation, Measurement, Resource Element De-Mapping, MIMO
Channel Mapping, De-Multiplexing, Handling Control Elements, HARQ, DRX
HARQ,CRC, Coding, Scrambling, Modulation, Measurement, Resource Element Mapping, MIMO
Channel Mapping, Multiplexing, Handling Control Elements, HARQ, Random Access Procedure, Logical Channel Priority, Sending BSR
Re-Ordering, Reassembly, ARQ (for AM mode)
Buffer Status Report, Segment & Concatenation, ARQ (for AM mode)
In Sequence Delivery, Duplicate Packet Detection, Integrity Validation, De-ciphering, Header-Decompression
Sequence Number Addition, Hand Over Data Handling, Integrity Protection, Ciphering, Header-Compression
Mobility Management, Configuration Management, Connection Management, Paging Control, Security Management, Broadcast, Measurement Configuration, Measurement Reporting, Cell Selection/Reselection
Mobility Management, Configuration Management, Connection Management, Paging Control, Security Management, Broadcast, Measurement Configuration, Measurement Reporting, Cell Selection/Reselection
Mobility Management, Session Management, Bearer Management, Paging Control, Security Management
Mobility Management, Session Management, Bearer Management, Paging Control, Security Management
