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Content for  TS 25.321  Word version:  16.0.0

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1  ScopeWord‑p. 9

The present document specifies the MAC protocol.
The specification describes:
  • MAC architecture;
  • MAC entities;
  • channel structure;
  • services provided to upper layers;
  • MAC functions;
  • services expected from the physical layer;
  • elements for layer-to-layer communication including primitives between MAC and RLC;
  • elements for peer-to-peer communication;
  • protocol data units, formats and parameters;
  • elementary procedures.

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 25.301: "Radio Interface Protocol Architecture".
[3]
TS 25.302: "Services provided by the Physical Layer".
[4]
TS 25.303: "Interlayer Procedures in Connected Mode".
[5]
TS 25.304: "UE Procedures in Idle Mode and Procedures for Cell Reselection in Connected Mode".
[6]
TS 25.322: "RLC Protocol Specification".
[7]
TS 25.331: "Radio Resource Control (RRC); protocol specification".
[8]
TR 25.921: "Guidelines and Principles for Protocol Description and Error Handling".
[9]
TR 25.990: "Vocabulary for the UTRAN".
→ to date, withdrawn by 3GPP
[10]
TS 33.102: "Security architecture".
[11]
TS 25.425: "UTRAN Iur Interface User Plane Protocols for Common Transport Channel Data Streams".
[12]
TS 25.133: "Requirements for support of radio resource management (FDD)".
[13]
TS 25.214: "Physical layer procedures (FDD)".
[14]
TS 25.123: "Requirements for support of radio resource management (TDD)".
[15]
TS 33.105: "Cryptographic Algorithm Requirements".
[16]
TS 25.212: "Multiplexing and Channel Coding (FDD)".
[17]
TS 25.215: "Physical layer - Measurements (FDD)".
[18]
TS 25.224: "Physical layer procedures (TDD)".
[19]
TS 25.222: "Multiplexing and Channel Coding (TDD)".
[20]
TS 25.225: "Physical layer - Measurements (TDD)".
[21]
TS 25.221: "Physical Channels and Mapping of Transport Channels onto Physical Channels (TDD)"
[22]
TS 25.213: "Spreading and modulation (FDD)".
[23]
TS 25.306: "UE Radio Access Capabilities".
[24]
TS 25.211: "Physical channels and mapping of transport channels onto physical channels (FDD)"
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3  Definitions and abbreviationsWord‑p. 10

3.1  Definitions

For the purposes of the present document, the terms and definitions given below and in [9] and [1] apply.

3.1.1  HS-DSCH Specific Definitions |R6|

Multiflow (FDD):
A mode of operation with two simultaneous HS-DSCH transport channels per carrier frequency, where the HS-DSCH transport channels may belong to the same or different Node Bs
Blind HARQ retransmissions for HSDPA (FDD):
A HARQ operation where a UE in CELL_DCH state supports reception of MAC-hs/ehs PDU within 5 sub-frames from the reception of the previous MAC-hs/ehs PDU intended for the same HARQ process.

3.1.2  E-DCH Specific Definitions |R6|

3.1.2.1  General |R7|

E-DCH:
The Enhanced Dedicated Channel (E-DCH) is an uplink transport channel.
HARQ profile:
One HARQ profile consists of a power offset attribute and maximum number of transmissions. For 1.28 Mcps TDD, it also includes a retransmission timer attribute.
Power offset attribute (FDD):
This represents the power offset between E-DPDCH(s) and reference E-DPDCH power level for a given E-TFC. This power offset attribute is set to achieve the required QoS in this MAC-d flow when carried alone in a MAC-e or MAC-i PDU and subsequently in the corresponding CCTrCh of E-DCH type. Details on the mapping on Beta factors can be found in [13]. The reference E-DPDCH power offset is signalled to the UE for one (or several) reference E-TFC(s) (see details in subclause 11.1).
Power offset attribute (TDD):
The power offset attribute is set to achieve the required QoS in this MAC-d flow when carried alone in a MAC-e or MAC-i PDU and subsequently in the corresponding CCTrCh of E-DCH type. Details on the power offset can be found in [18].
Primary Absolute Grant:
Absolute Grant received with the primary E-RNTI. Note that the primary E-RNTI is the only E-RNTI for TDD.
Serving E-DCH cell:
Cell from which the UE receives Absolute Grants from the Node-B scheduler. A UE has one Serving E-DCH cell.
Serving_Grant (FDD):
The state variable Serving_Grant indicates the maximum E-DPDCH to DPCCH power ratio that the UE is allowed to use for scheduled data in the following transmission. The value in the appropriate state variable will be provided to the E-TFC selection function to help in selecting the best format for the upcoming transmission. Possible values are: "Zero_Grant" and numerical values. The DPCCH power assumed for the Serving_Grant in a compressed frame is the actual DPCCH power in the compressed frame minus 10Log10 (Npilot,N/Npilot,C) as defined in [13].
Serving_Grant (TDD):
The state variable Serving_Grant indicates the power ratio of maximum E-PUCH power level per TDD resource unit relative to a reference E-PUCH power level Pe-ref that the UE is allowed to use for scheduled data on the physical resources associated with the E-AGCH grant. Pe-ref is defined as the calculated E-PUCH transmit power (PE-PUCH) in [18] with βe=0. The value in the appropriate state variable will be provided to the E-TFC selection function to help in selecting the best format for the upcoming transmission. Possible values are: "Zero_Grant" and numerical values.
UL Common MAC Flow(1.28 Mcps TDD):
an UL Common MAC Flow is a flow of MAC-c PDU mapped to E-DCH configured for UEs in Cell_FACH state and IDLE mode.
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3.1.2.2  FDD |R7|Word‑p. 11

Active Process:
HARQ process for which Scheduling Grant are applicable, i.e. scheduled data can be sent.
AG_Timer:
This timer is set to one HARQ RTT (40ms in the case of 10ms TTI, 16ms in the case of 2ms TTI).
Common E-DCH resource:
Common E-DCH resources are under direct control of the Node B and are shared by UEs in CELL_FACH state and IDLE mode.
Common E-RGCH RL:
Cell which is not the serving E-DCH radio link and from which the UE can receive one Relative Grant in CELL_FACH state. The UE can have zero, one or up to 3 Common E-RGCH RL(s).
E-DCH active set:
The set of cells which carry the E-DCH for one UE. For FDD, in CELL_FACH state and Idle mode, the E-DCH active set consists of the Serving E-DCH cell only.
Implicit Grant handling:
A scheduling scheme where a UE's Scheduling Grant on the Secondary Serving E-DCH cell may be revoked by means of an Absolute Grant addressed to another UE.
Implicit_Zero_Grant:
A boolean variable used to indicate if the Serving Grant can be implicitly set to zero by the reception of an Absolute Grant that is addressed to another UE.
Inactive Process:
HARQ process for which Scheduling Grants are not applicable, i.e. scheduled data cannot be sent.
INACTIVE:
Absolute Grant value that can be sent by the serving cell's scheduler on the E-AGCH to deactivate a process or to switch the UE to its secondary E-RNTI. In CELL_FACH state, this absolute grant value is used to release a common E-DCH resource when the Absolute Grant Scope is set to "All HARQ processes".
Lowest Configured Serving Grant Value:
The serving grant value indicated by index 0 of the SG table in use.
Maximum_Serving_Grant:
The variable Maximum_Serving_Grant indicates the maximum E-DPDCH to DPCCH power ratio that the UE is allowed to use for scheduled data while the timer Non_Serving_RG_Timer has not expired.
Maximum number of re-transmissions, Maximum number of transmissions:
Maximum number of re-transmissions = maximum number of transmissions - 1. Both these notations are used.
Minimum_Grant:
The value Minimum_Grant corresponds to the minimum E-DPDCH to DPCCH power ratio that the UE considers. This value is in index 0 of the configured scheduling grant table described in subclause 9.2.5.2.1.
NodeB triggered HS-DPCCH transmission:
Transmission on a common E-DCH resource to provide HS-DPCCH feedback in CELL_FACH state, which is triggered by the reception of an HS-SCCH order as defined in [16].
Non-serving E-DCH RL or Non-serving RL:
Cell which belongs to the E-DCH active set but does not belong to the Serving E-DCH RLS and from which the UE can receive one Relative Grant. The UE can have zero, one or several Non-serving E-DCH RL(s).
Non_Serving_RG_Timer:
This timer is set to one HARQ RTT (40ms in the case of 10ms TTI, 16ms in the case of 2ms TTI).
Primary Absolute Grant:
Absolute Grant received with the primary E-RNTI.
Primary_Grant_Available:
This state variable is a Boolean, indicating whether the UE's serving grant is only affected by Primary Absolute Grants and Relative Grants (i.e. not by Secondary Absolute Grants).
Primary Uplink Frequency:
If a single uplink frequency is configured for the UE, then it is the primary uplink frequency. In case more than one uplink frequencies are configured for the UE, then the primary uplink frequency is the frequency on which the E-DCH corresponding to the serving E-DCH cell associated with the serving HS-DSCH cell is transmitted. The association between a pair of uplink and downlink frequencies is indicated by higher layers.
reference_ETPR:
The state variable reference_ETPR holds the E-DPDCH to DPCCH power ratio used as reference for relative grant commands. This variable is set to the E-DPDCH to DPCCH power ratio used for the E-TFC selected for the previous TTI on this HARQ process, calculated using the amplitude ratios prior to the quantization according to subclause 5.1.2.5B.2.3 of TS 25.214 or subclause 5.1.2.5B.2.4 of TS 25.214, excluding non-scheduled transmissions, excluding any scaling applied according to subclause 5.1.2.6 of TS 25.214 and is obtained from the physical layer. In case no scheduled transmission took place on a HARQ process in the previous TTI, reference_ETPR shall be set to Minimum_Grant for this HARQ process.
reference_ETPR2:
The state variable reference_ETPR2 holds the E-DPDCH to DPCCH power ratio used as reference for non serving relative grant commands. This variable is set to the previously stored reference_ETPR on this HARQ process when the reference_ETPR is updated with a new value.
Secondary Absolute Grant:
Absolute Grant received with the secondary E-RNTI.
Serving E-DCH RLS or Serving RLS:
Set of cells which contains at least the Serving E-DCH cell and from which the UE can receive and combine one Relative Grant. The UE has only one Serving E-DCH RLS. For FDD, in CELL_FACH state and Idle mode, the Serving E-DCH RLS or Serving RLS contains the Serving E-DCH cell only, from which the UE can receive one Relative Grant.
Stored_Secondary_Grant:
This state variable is used to store the value derived from the last received Secondary Absolute Grant Value. Possible values are: "Zero_Grant" and numerical values.
UL Common MAC Flow:
an UL Common MAC Flow is a flow of MAC-c PDU mapped to E-DCH configured for UEs in Cell_FACH state and IDLE mode.
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3.1.3  DTX-DRX and HS-SCCH less Specific definitions (FDD only) |R7|Word‑p. 12

MAC DTX cycle:
Defines the pattern of time instances where the start the uplink E-DCH transmission after inactivity is allowed.
MAC Inactivity Threshold:
E-DCH inactivity time after which the UE can start E-DCH transmission only at given times.
UE DTX DRX Offset:
Uplink DPCCH burst pattern and HS-SCCH reception pattern offset in subframes.
HS-SCCH less mode of operation:
HS-SCCH less mode of operation is enabled when the variable HS_SCCH_LESS_STATUS defined in [7] is set to TRUE.
Inactivity Threshold for UE Grant Monitoring:
Determines the number of E-DCH TTIs after an E-DCH scheduled transmission during which the UE is required to monitor the full E-AGCH transmissions from the serving radio link and the full E-RGCH(s) from all the cells in the E-DCH active set.
Inactivity Threshold for UE DTX cycle 2:
Defines a number of consecutive E-DCH TTIs without an E-DCH transmission, after which the UE shall immediately move from UE_DTX_cycle_1 to using UE_DTX_cycle_2.
Default-SG-in-DTX-Cycle-2:
Defines the default E-DCH Serving Grant used in the case when the UE moves from UE DTX cycle 1 to UE DTX cycle 2 after Inactivity Threshold for UE DTX cycle 2 triggers.
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3.1.4  HS-DSCH/E-DCH SPS Specific definitions (1.28 Mcps TDD only) |R8|Word‑p. 13

HS-DSCH SPS operation:
HS-DSCH SPS operation is enabled when the variable HS_DSCH_SPS_STATUS defined in [7] is set to TRUE.
HS-DSCH SPS resources:
Defines the downlink physical resources in term of timeslots and codes on which the first HS-DSCH transmission of transport blocks is performed without the accompanying HS-SCCH and HARQ retransmission of the first HS-DSCH transmission are accompanied by HS-SCCH.
E-DCH SPS operation:
E-DCH SPS operation is enabled when the variable E_DCH_SPS_STATUS defined in [7] is set to TRUE.
E-DCH SPS resources:
Defines the uplink physical resources in term of granted timeslots, codes and power on which the UE may transmit transport blocks without receiving other grants on E-AGCH.
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3.1.5  Dual Cell E-DCH Specific definitions (FDD only) |R9|

Activated Uplink Frequency:
For a specific UE, an uplink frequency is said to be activated if the UE is allowed to transmit on that frequency. The primary uplink frequency is always activated when configured while a secondary uplink frequency has to be activated by means of an HS-SCCH order in order to become activated.
Configured Uplink Frequency:
For a specific UE, an uplink frequency is said to be configured if the UE has received all relevant information from RRC in order to perform transmission on that frequency.
Secondary Uplink Frequency:
A secondary uplink frequency is a frequency on which an E-DCH corresponding to a serving E-DCH cell associated with a secondary serving HS-DSCH cell is transmitted. The association between a pair of uplink and downlink frequencies is indicated by higher layers.
Secondary E-DCH Active Set:
The set of cells on the secondary downlink frequency where E-DCH is carried for one UE.
Secondary Serving E-DCH cell:
Cell from which the UE can receive Absolute Grants from the Node-B scheduler on the secondary downlink. A UE has one configured Serving E-DCH cell on the secondary uplink frequency.
Secondary Serving E-DCH RLS or Secondary Serving RLS:
The set of cells which contains at least the Secondary Serving E-DCH cell and from which the UE can receive and combine one Relative Grant. A UE can have zero or one Secondary Serving E-DCH RLS.
Secondary Non-serving E-DCH RL or Secondary Non-serving RL:
The cell which belongs to the Secondary E-DCH active set but does not belong to the Secondary Serving E-DCH RLS and from which the UE in CELL_DCH can receive one Relative Grant. The UE can have zero, one or several Secondary Non-serving E-DCH RL(s).
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3.2  Abbreviations

For the purposes of the present document, the following abbreviations apply:
AG
Absolute Grant
ASC
Access Service Class
BCCH
Broadcast Control Channel
BCH
Broadcast Channel
C-
Control-
CCCH
Common Control Channel
DCCH
Dedicated Control Channel
DCH
Dedicated Channel
DL
Downlink
DSCH
Downlink Shared Channel
DTCH
Dedicated Traffic Channel
E-AGCH
E-DCH Absolute Grant Channel
E-DCH
Enhanced Dedicated Transport Channel
E-DPCCH
E-DCH Dedicated Physical Control Channel (FDD only)
ENI
E-UCCH Number Indication (1.28Mcps TDD only)
E-HICH
E-DCH HARQ Acknowledgement Indicator Channel
E-PUCH
Enhanced Uplink Physical Channel (TDD only)
E-RGCH
E-DCH Relative Grant Channel
E-RGCH
E-DCH Relative Grant Channel (FDD only)
E-RNTI
E-DCH Radio Network Temporary Identifier
E-ROCH
E-DCH Rank and Offset Channel (FDD only)
E-RUCCH
E-DCH Random Access Uplink Control Channel (TDD only)
E-TFC
E-DCH Transport Format Combination
E-TFCI
E-DCH Transport Format Combination Indicator
E-UCCH
E-DCH Uplink Control Channel (TDD only)
FACH
Forward Link Access Channel
FDD
Frequency Division Duplex
HARQ
Hybrid Automatic Repeat Request
HCSN
HS-SCCH Cyclic Sequence Number
HSDPA
High Speed Downlink Packet Access
HS-DSCH
High Speed Downlink Shared Channel
L1
Layer 1 (physical layer)
L2
Layer 2 (data link layer)
L3
Layer 3 (network layer)
MAC
Medium Access Control
MBMS
Multimedia Broadcast Multicast Service
MCCH
MBMS point-to-multipoint Control Channel
MTCH
MBMS point-to-multipoint Traffic Channel
MSCH
MBMS point-to-multipoint Scheduling Channel
PCCH
Paging Control Channel
PCH
Paging Channel
PDU
Protocol Data Unit
PHY
Physical layer
PhyCH
Physical Channels
RACH
Random Access Channel
RG
Relative Grant
RLC
Radio Link Control
RLS
Radio Link Set
RNC
Radio Network Controller
RNS
Radio Network Subsystem
RNTI
Radio Network Temporary Identity
RRC
Radio Resource Control
RSN
Retransmission Sequence Number
SAP
Service Access Point
SDU
Service Data Unit
SHCCH
Shared Channel Control Channel
SRNC
Serving Radio Network Controller
SRNS
Serving Radio Network Subsystem
TDD
Time Division Duplex
TFCI
Transport Format Combination Indicator
TFI
Transport Format Indicator
TSN
Transmission Sequence Number
U-
User-
UE
User Equipment
UL
Uplink
UMTS
Universal Mobile Telecommunications System
USCH
Uplink Shared Channel
UTRA
UMTS Terrestrial Radio Access
UTRAN
UMTS Terrestrial Radio Access Network
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