IEEE C802.16m-08/297
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Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Proposed Baseline Content on the Downlink Control Structure for the 802.16m SDD
Date
Submitted
2008-05-05
Source(s)
Zexian Li,
Roshni Srinivasan
Chulsik Yoon
zexian.li@nokia.com
roshni.m.srinivasan@intel.com
csyoon@etri.re.kr
Project 802.16m DL Control
Rapporteur Group Chairs
Re:
IEEE 802.16m-08/015r1, Charter and Scope of TGm Rapporteur Groups
Abstract
Consolidated SDD text on the DL Control Structure based on contributions submitted to the
802.16m DL control structure in session #54 and the 802.16m Rapporteur Group for DL Control
is provided in this contribution. This content is an update to Draft 3, C802.16mDL_ctrl-08/37,
which was generated by the Rapporteur Group Editors. Feedback from the email discussion
following Draft 3 is also incorporated.
To be discussed and adopted by TGm for use in the 802.16m SDD.
Purpose
Notice
Release
Patent
Policy
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It
represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for
discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material
contained herein.
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution,
and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name
any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole
discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The
contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16.
The contributor is familiar with the IEEE-SA Patent Policy and Procedures:
<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and
<http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and
<http://standards.ieee.org/board/pat>.
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Proposed Baseline Content on the Downlink Control Structure
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for the 802.16m SDD
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Zexian Li, Roshni Srinivasan, Chulsik Yoon
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Project 802.16m DL Control Rapporteur Group Editors
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Introduction
Initial text to be included in Section 11 of the 802.16m System Description Document (SDD) [1] under
the DL control structure section is proposed in this contribution. Input from members’ contributions on
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the 802.16m DL control structure in session #54 [2], as well as contributions and discussions in the
DL Control Rapporteur Group [3] are captured. Consensus in submitted proposals is identified and
alternatives that require further harmonization or resolution are listed.
The proposed text is organized as follows:
11.x
DL Control Structure
11.x.1.
DL Control Information Classification
11.x.1.1.
Synchronization information
11.x.1.2.
Essential system parameters and system configuration information
11.x.1.2.1.
2a)
Network-wide common essential system parameters and system configuration information (Type
11.x.1.2.2.
Sector-specific DL essential system parameters and system configuration information (Type 2b)
11.x.1.2.3.
Remaining essential system parameters and system configuration information (Type 2c)
11.x.1.3.
Extended system parameters and system configuration information
11.x.1.4.
Control and signaling for DL notifications
11.x.1.5.
Control and signaling for traffic
11.x.2.
Synchronization Channel (SCH)
11.x.3.
Broadcast Channel (BCH)
11.x.3.1.
Primary Broadcast Channel (PBCH) and Secondary Broadcast Channel (SBCH)
11.x.3.2.
Location of the BCH
11.x.3.3.
Multiplexing of the BCH with control and data
11.x.3.4.
Transmission format
11.x.3.5.
Resource allocation (physical to logical mapping, pilots, block size)
11.x.4.
Additional broadcast information
11.x.5.
Unicast Service Control Channels
11.x.5.1.
Unicast service control information/content
11.x.5.2.
Multiplexing scheme for data and unicast service control
11.x.5.3.
Location of control blocks
11.x.5.4.
Transmission format
11.x.5.5.
Resource allocation (physical to logical mapping, pilots, block size)
11.x.6.
Multicast Service Control Channels
11.x.6.1.
Multicast service control information/content
11.x.6.2.
Multiplexing scheme of data and multicast service control and (e.g. TDM, FDM, Hybrid TDM//FDM)
11.x.6.3.
Location of control blocks within a frame/subframe
11.x.6.4.
Transmission format (e.g. modulation, coding, multiple antenna schemes)
11.x.6.5.
Resource allocation (physical to logical mapping, pilots, block size)
11.x.7.
11.x.8.
Multi-carrier Control Structure
Mapping of information into control channels
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Editors’ Notes
In order to provide a general framework for the DL control structure, content in this contribution has
been organized by function. Reference to specific solutions and terminology associated with these
solutions has not been included. Text describing procedures for implementation has also not been
included. Observed consensus and items pending resolution are noted in each section.
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References
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[1] IEEE C802.16m-08/003r1, Project 802.16m System Description Document (SDD)
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[2] IEEE C802.16mDL_ctrl-08/004r1, Initial Contribution List for Project 802.16m Rapporteur Group
for Downlink Control
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[3] IEEE C802.16m-08/298, Project 802.16m DL Control Structure Rapporteur Group Report
Editors’ notes on observed consensus and items requiring resolution are included in each section in
black italics. These notes provide context for the listed options and are intended for use in the
comment phase and resolution of comments in Session #55. Once comments are resolved, these
notes may be removed from the proposed SDD text.
Text in black is used to identify consolidated text proposals for concept that exhibited substantial
consensus in the contributions to the DL Control Rapporteur Group. Text requiring further resolution
is noted separately and proposed alternatives are bracketed in different colors.
Dependencies on text in other sections of the SDD that are still under development have been
captured in notes wherever applicable.
Figures have not been included in this document. Once options have been narrowed down, figures to
illustrate relevant control structures should be included.
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11.x
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Editors’ Notes:
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[IEEE 802.16m BS transmits a Synchronization Channel and a Broadcast Control Channel for both
802.16m and legacy system in order to support a fast network entry process for all MSs with less
extra overhead.]
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Details of the DL control structure are described in the following sections.
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11.x.1. DL Control Information Classification
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11.x.1.1.
Synchronization information
This type of control information is necessary for system acquisition and synchronization.
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11.x.1.2.
Essential system parameters and system configuration information
This includes a minimal set of time critical system configuration information and parameters needed
for the MS to complete [initial] access in a power efficient manner. Examples of such information are
DL Control Structure
DL control channels are needed to convey information essential for system operation. The basic
frame structure is illustrated in Figure 8 in Section 11.4.1. In order to reduce the overhead and
network entry latency, and improve robustness of the DL control channel, information is transmitted
hierarchically over different time scales from the superframe level to the subframe level. Broadly
speaking, control information related to system parameters and system configuration is transmitted at
the superframe level, while control and signaling related to traffic transmission and reception is
transmitted at the frame/subframe level.
Options for DL control structures for mixed mode operation are proposed in the following text. Since preamble
design will depend on contributions submitted in Session #55 or later and will be developed by rapporteur
groups constituted to develop such text, a decision on this item is pending resolution.
[In mixed mode operation (legacy/802.16m), an 802.16m MS can access the system without
decoding legacy FCH and legacy MAP messages.]
Editors’ Notes:
Consensus: C801.26mDL_ctrl-08_035r1 and supporting contributions provide a more harmonized view of the
high level classification of control information content.
Pending Resolution: Although there is consensus in broad classification of DL control information, there is
some variation in depth of classification and examples included in each class. The proposed classification of
information types is pending resolution.
A minimal set of examples has been provided for each class of information. Additional examples should be
provided for clarity.
Information carried in the control channels is classified as follows.
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CP size, system bandwidth, etc. This group of information also includes the superframe configuration
information related to the configuration of sub-frames within the superframe.
[
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11.x.1.2.2.
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11.x.1.2.3.
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11.x.1.3.
Extended system parameters and system configuration information
This category includes additional system configuration parameters and information not critical for
[initial] access, but needed and used by all MSs after system acquisition. Examples of this class
include information required for handover such as [handover trigger], [neighbor BS information], etc.
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11.x.1.4.
Control and signaling for DL notifications
Control and signaling information may be transmitted in the DL to provide network notifications such
as paging targeting a single user or a group of users in the idle mode and sleep mode.
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11.x.1.5.
Control and signaling for traffic
The control and signaling information transmitted in the DL for resource allocation to a single user or
a group of users in active or sleep modes is included in this category. This class of information also
includes feedback information such as power control and DL acknowledgement signaling related to
traffic transmission/reception.
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11.x.2. Synchronization Channel (SCH)
Network-wide common essential system parameters and system configuration
information (Type 2a)
This includes a minimal set of time critical PHY layer parameters that are common among all sectors
in the network and essential for decoding the DL. Examples of this type of information include CP
length, system bandwidth (at least DL bandwidth, UL bandwidth may be classified as Type 2C if
asymmetric bandwidth is supported), TDD ratio, superframe index, etc.
Sector-specific DL essential system parameters and system configuration
information (Type 2b)
This includes a minimal set of time critical system configuration and parameters information that are
sector-specific and are needed for the MS to decode the DL broadcasted system message that are
carried on the traffic channels. Examples of this type of information include antenna configuration, DL
resource allocation configuration, pilot configuration, 16e/16m co-existence configuration, etc.
Remaining essential system parameters and system configuration information
(Type 2c)
This includes a minimal set of time critical system configuration and parameters information that are
needed for the MS to initiate access on the UL. Examples of this type of information include UL
resource allocation configuration (if different from the DL one), system configuration for initial ranging,
UL bandwidth if asymmetric bandwidth is supported, UL power control parameters, etc.
]
Editors’ Notes:
Consensus: There was general agreement on the information required for synchronization and mapping of the
information into the synchronization channel.
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Pending resolution:
The proposals called for further resolution on the location of the SCH, separation of the SCH into Primary SCH
and Secondary SCH, support for multiple carriers and multiple system bandwidths.
The following is a summary of the considerations proposed for the design of the SCH:
 The SCH is located at the beginning (first symbol) of a superframe, and before BCH
 The SCH is located at the central frequency subchannel in SFH
 The use of legacy preamble when it exists or alternatively, an 802.16m MS can ignore legacy preamble
when it exists
 The SCH (PSC/SSC) is located after PBCH
Since text in this section will depend on contributions submitted in Session #55 or later and will be developed
by rapporteur groups constituted to develop such text, the majority of proposals did not cover details of the
SCH. Based on contributions submitted, it was identified that proposals on preamble design and support for
multicarrier operation (Section 19 of the SDD) would influence the development of control structures carrying
synchronization information.
The synchronization channel is a DL physical channel which provides a reference signal for time,
frequency and frame synchronization and BS identification for system acquisition.
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11.x.3. Broadcast Channel (BCH)
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11.x.3.1.
Editors’ Notes:
Consensus: There is consensus that the BCH carries system configuration information.
Pending Resolution: Information content in Broadcast Channel needs further harmonization.
Broadcast information includes essential system parameter and system configuration information.
Primary Broadcast Channel (PBCH) and Secondary Broadcast Channel (SBCH)
Editors’ Notes:
The design criterion for separation of the BCH into PBCH and SBCH must be examined. Classification into
primary/secondary broadcast channels in 11.x.3 has been made based on either time criticality of information
for access or rate of change of information (slow/fast changing). Is all time critical information for access slowchanging? Will the PBCH and SBCH have the same configuration/transmission format/information content
requirements?
If the group decides to separate the BCH into PBCH and SBCH, this section may be included. The following
options for separation of BCH into PBCH and SBCH have been proposed.
Option 1: No separation between PBCH and SBCH, delete this section (11.x.3.1)
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Option 2:
[The Primary Broadcast Channel (PBCH) carries the static or slow changing essential system
parameters and system configuration information. The Secondary Broadcast Channel (SBCH)
[carries the superframe configuration information.] [contains information that changes every
superframe.]
Option 3:
[The PBCH carries system parameters and system configuration information essential for access
whereas the SBCH carries system information not essential for access.]
[PBCH is located in SFH and contains information essential for system entry and initialization. The
SBCH is located outside of SFH, and indicated by BCI (Broadcast Control Channel) in SFH. In
addition to paging and neighbor advertisement, it contains system configuration information including
handover parameters, power control messages, HARQ parameters, fast feedback region, ranging
etc.]
[The Primary Broadcast Channel carries time critical information essential for access. It is transmitted
in its entirety at fixed intervals in a known location e.g. in every SFH (20ms).The Secondary
Broadcast Channel carries information not essential for access. It is transmitted as necessary e.g.
over multiple superframe intervals. It may be located in the SFH and follows the PBCH. The size of
the SBCH depends on the information elements that need to be transmitted.]
Option 4:
[The Primary Broadcast Channel (P-BCH) carries network-wide common essential system
parameters and system configuration information while the Secondary Broadcast Channel (S-BCH)
carries sector-specific essential system parameters and system configuration information.]
]
11.x.3.2.
Location of the BCH
Editors’ Notes:
Consensus: Based on the frame structure described in Section 11.4.1, there is consensus that the SFH is
transmitted in the first subframe of the superframe.
This section specifies options to first determine the location of the BCH within the SFH and then the location of
the SFH in the superframe.
Pending Resolution: The following options need further harmonization to resolve the relative location of the
SCH and BCH. Additionally, if the decision in 11.x.3.1 is to separate the BCH into PBCH and SBCH, then the
appropriate text must be included in the selected option.
Option 1:
[The SCH is at the start of the superframe and the SFH follows the SCH. The SFH carries the BCH]
Option 2:
[The SFH is at the start of the superframe and includes the SCH and the BCH].
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Option 3:
[The SCH (PSC and SSC) is located after the PBCH in the SFH. The PBCH and the SCH are located
in the first TBD OFDM symbols at the beginning of a superframe, and around the center frequency]
Pending Resolution: The duration of the SFH (entire subframe or part of subframe) and the frequency resource
utilized needs resolution. Additionally, if the decision in 11.x.3.1 is to separate the BCH into PBCH and SBCH
then the appropriate text needs to be included.
Option 1:
[The SFH is transmitted in the first sub-frame within a superframe. It may be transmitted over one or
more symbols in the subframe.]
Option 2:
[The SFH is transmitted in the first sub-frame within a superframe. It may be transmitted over one or
more symbols in the subframe and all or part of the system bandwidth.]
Option 3:
[The SFH is transmitted in the first sub-frame within a superframe. It is transmitted over all available
symbols in the subframe and all or part of the system bandwidth.]
Option 4:
[The SFH occupies all symbols of the first subframe in a superframe. Within the SFH, the SCH
resides in the first symbol. The remaining symbols in the subframe belong to the PBCH.]
11.x.3.3.
Multiplexing of the BCH with control and data
Editors’ Notes:
Consensus: The SCH is TDM with the BCH.
Pending Resolution: Multiplexing of BCH with other control channels (if they exist) in the SFH and other data
channels in other OFDM symbols within the same subframe need resolution.
The BCH is TDM with the SCH.
Editors’ Notes:
Pending Resolution: For consistency, decisions must be made in the following hierarchy:
First, we should determine whether or not other control channels in addition to the BCH may be needed in the
SFH, since the SFH appears only once every superframe.
Option 1: One of the following two bracketed sentences must be picked within this option.
[BCH is the only unified control channel in the SFH] [The PBCH and SBCH are the only control
channels in the SFH]
Option 2: In this option, only the PBCH is in SFH, and there no other control channels in SFH
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[The PBCH is the only control channel in the SFH. The SBCH is located outside the SFH and pointed
to by the PBCH]
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11.x.3.4.
Option 3: The BCH is multiplexed with other control channels in the SFH. If Option 3 is chosen, one of the
following options for multiplexing the BCH with other control channels in the SFH must be chosen.
Additionally, if the decision in 11.x.3.1 is to separate the BCH into PBCH and SBCH then the appropriate text
needs to be included.
Option 3(a): FDM
[The BCH is FDM with other control channels in the SFH]
Option 3(b): TDM
[The BCH is TDM with other control channels in the SFH]
Option 3(c): TDM/FDM
[The BCH is TDM/FDM with other control channels in the SFH]
Pending Resolution: If the BCH is the only control channel in the SFH, then the following options need to be
considered for multiplexing of the SFH with other control channels outside the SFH in the same subframe. If
the decision in 11.x.3.1 is to separate the BCH into PBCH and SBCH then the appropriate text must be included
in the selected option.
Option 1: FDM
[The BCH in the SFH is FDM with other control channels in the same subframe.]
Option 2: TDM
[The BCH in the SFH is TDM with other control channels in the same subframe.]
Option 3: TDM/FDM
[The BCH in the SFH is TDM/FDM with other control channels in the same subframe.]
Pending Resolution: If the BCH is the only control channel in the SFH, options for multiplexing of BCH with
data within the same subframe are as follows. If the decision in 11.x.3.1 is to separate the BCH into PBCH and
SBCH, then the appropriate text must be selected in the option.
Option 1:FDM
[Data spans entire subframe in time, BCH in the SFH is FDM with data within the same subframe.]
Option 2: TDM
[The BCH in the SFH is TDM with data within the same subframe.]
Option 3: TDM/FDM
[The BCH in the SFH is TDM/FDM with other data within the same subframe.]
Transmission format
Editors’ Notes:
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Consensus: There is consensus that the SFH is transmitted using a fixed modulation and coding rate. The
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11.x.3.5.
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Editors’ Notes:
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This section depends on SDD text included in the DL PHY Structure.
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11.x.4. Additional broadcast information
Pending Resolution: If the BCH/PBCH is selected as the only control channel in the SFH in 11.x.3.4, then the
“SFH” in the options below should be replaced by “BCH in SFH”. Additionally, if the decision in 11.x.3.1 is to
separate the BCH into PBCH and SBCH, then the appropriate text must be included in the selected option.
Terminology needs to be consistent with the previous sections. Support for multiple antenna schemes (Transmit
Diversity/CDD) and signaling of MA scheme and antenna configuration needs resolution. Inclusion of
repetition coding needs resolution.
The SFH is transmitted using a fixed modulation and coding rate. The modulation and coding rate
are TBD.
Options for transmission format and coding:
[Multiple antenna schemes (Transmit Diversity/CDD) for transmission of the SFH are supported.]
[The multiple antenna scheme used to transmit the SFH is signaled in the preamble] [Signaling of the
multiple antenna scheme used to transmit the SFH is TBD].
[As the PBCH contains static system information, repetition coding is used across multiple
superframe headers to improve the robustness.]
Resource allocation (physical to logical mapping, pilots, block size)
Pending Resolution: Additional broadcast information content needs to be resolved.
Additional broadcast control information is not included in the superframe header. Examples include
system descriptors, neighbor BS information and paging information. [The presence of additional
broadcast control information in the current superframe is indicated in the SFH.] [The presence of
additional broadcast information in the current superframe is indicated in a broadcast pointer in the
SBCH.]
[Additional broadcast information is transmitted in the first subframe of the frame or the superframe]
Pending Resolution: The mechanism for paging has to be decided from the following options and the paging
channel needs to be defined.
[The paging indicator is sent as part of the BCH in the SFH].
[A quick paging signal is sent by the BS to provide an early indication to a group of MS of the need to
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read the full paging signal in the assigned paging frame.]
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[Legacy MAC management messages may be used in 802.16m with suitable modifications to align
with 802.16m structures.]
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[New MAC management messages may be defined for 802.16m based on the definition of structures
(frame, control, etc.) in 802.16m.]
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11.x.5. Unicast Service Control Channels
MAC management messages may be used to transmit additional broadcast information.
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11.x.5.1.
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A Map Channel (MCH) may carry sub-MAPs. Multiple sub-MAPs may be transmitted on the MCH
with different transmission format. Sub-MAP contains resource allocation information for one or
multiple users. ]
Unicast service control information/content
Editors’ Notes:
Consensus: Resource allocation for unicast services at the subframe level is signaled through a MAP channel
or its equivalent.
Pending Resolution: HARQ support and power control information require resolution. The content of this
section is dependent on decisions made in subsequent sections (multiplexing, location etc.) and may be
developed from the options listed below. Consistency must also be maintained with previous sections.
Option 1:
[Unicast service control channels include control information for resource allocation, HARQ operation
on the DL and UL, and power control.]
Option 2:
[MAP Indication Channel (MICH) is located at the beginning of every sub-frame or concatenated subframes. MICH is used to indicate the length and transmission format of the first sub-MAP. Presence
of MICH channel in a sub-frame is indicated in SFH. Every MCH channel is prefixed by a MICH.
Option 3:
[Resource allocation for unicast services on the DL is signaled using a multicast message that is sent
to all the assigned users and indicates how the resources in a zone are partitioned. User specific
assignment information for each scheduled user is contained in separate unicast messages. The
unicast information is contained within the resource partition assigned to the user.
HARQ control is sent as a unicast message. It contains the HARQ channel ID associated with the
retransmission.
A number of diversity resources are allocated for a group of control channels. A portion of these
resources are allocated for UL HARQ ACK/NACK.
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A number of diversity resources are allocated for a group of control channels. A portion of these
resources are allocated for power control information.]
Option 4:
[Resource allocation and HARQ control information for unicast services on the DL are transmitted in
the DL Grant channel. The DL grant channel carries DL/UL resource grant message or UL access
grant message for one user within a subframe. The messages are scrambled by MAC ID of intended
recipient(s) for DL/UL resource grant message or specific sequence for UL random access grant
message.
A DL HARQ Acknowledgement Channel or a timely explicit UL Retransmission Grant is used to
support UL HARQ ACK/NACK transmissions.
Power control information with the PC bits for MS UL power control is transmitted on a Power Control
Channel.
Other control information for unicast services includes the Subframe Format Indicator and the
Additional Common Pilot Presence Indicator.]
11.x.5.2.
Multiplexing scheme for data and unicast service control
Editors’ Notes:
Consensus: There is consensus on the concepts proposed in each of the alternatives listed below. Terminology
needs to be harmonized further.
Pending Resolution: A decision must first be taken on whether the multiplexing scheme is a combination of
FDM and TDM or TDM or FDM. One of the listed options must be then chosen. Terminology needs to be
consistent with previous sections, text related to specific solutions and procedures needs to be eliminated.
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Option 1: Combination of FDM and TDM
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[DL control channels and data are multiplexed in a subframe using a combination of TDM and FDM.]
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[The control zone occupies x subcarriers in the first y (y<6) OFDM symbols in a subframe. The data
zone occupies the remaining usable subcarriers in the first y OFDM symbols. The data zone also
occupies the remaining (6-y) OFDM symbols. The value of y can be standardized. The value of x is
indicated and modulated on the common pilots in the control zone.]
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Option 2: TDM
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[Control and data channels are multiplexed using TDM.]
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Option 3: FDM
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[DL control channels and data are multiplexed in a subframe using FDM. Subframe format indicator
channel is always transmitted through distributed resource to get frequency diversity. Subframe
format indicator channel provides the information about resource partition and permutation setting
within a subframe. In addition, this channel also provides information about decoding DL/UL control
blocks. In different permutation zone, DL/UL control blocks have different permutation type. e.g. in
localized zone, DL/UL control blocks also are localized.]
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[Control channels and data are multiplexed using FDM. Both control and data channels are
transmitted on logical resource units (LRU) that span all OFDM symbols in a subframe.]
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11.x.5.3.
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Option 1: Every Subframe
[Control blocks for unicast services are located in every subframe]
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11.x.5.4.
[Control and data are FDM within sub-frame and TDM across sub-frames.]
Location of control blocks
Editors’ Notes:
Consensus:
Pending Resolution: The location of the control blocks within a subframe is captured in the following options.
Further harmonization of terminology and concepts is recommended to reduce the number of options.
Terminology needs to be consistent with previous sections, text related to specific solutions and procedures
needs to be eliminated.
[Unicast service control channels are located every subframe. Transmission of control channels
every n (=2,3,…) subframes is FFS. The location of control blocks within a subframe and its
indication method are TBD.]
Option 2: Every n subframes
[In the TDD mode, control blocks for unicast services are located once per frame and twice per frame
in FDD when supporting legacy operation. When legacy systems are not supported, control blocks
occur more than once per frame i.e., every n subframes, where n is fixed and equal =2,4, …]
[Control blocks for unicast services are located at start of every n subframes, n=1,2,3,4. The value of
n is broadcast in the SFH or BSD.]
Option 3: Every frame
[Control blocks for unicast services are located once per frame.]
Option 5: Flexible
[Control blocks for unicast services are flexibly located and may span one or more subframes. The
location is signaled in the SFH.]
Transmission format
Editors’ Notes:
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Pending Resolution: A decision must first be taken on whether the MAP assignment blocks are coded jointly or
separately and whether a fixed MCS or a variable MCS must be used for each coded control block. Further
resolution is required for repetition coding.
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It must be noted that the decision in this section depends on the options chosen in the previous sections.
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A unicast service control information element is defined as the basic element of unicast service control. A
unicast service control information element may be addressed to one user using a unicast ID or to multiple
users using a multicast/broadcast ID. It may contain information related to resource allocation, HARQ,
transmission mode etc.
If each unicast service control information element is coded separately, this type of coding is referred to as
“separate coding”, whereas if multiple unicast service control information elements are coded jointly, this type
of coding is referred to as “joint coding”.
A coded control block is the output of separate coding or joint coding. The MCS of each coded control block
may be controlled individually. Coded control blocks may all be transmitted at the same MCS and this
transmission scheme is referred to as “fixed MCS”. If each coded block may be transmitted at a different MCS,
this scheme is referred to as “variable MCS”.
Coding of multiple unicast service control information elements may therefore either be joint coding or
separate coding.
MCS of coded control blocks may either be with a fixed MCS or a variable MCS
The following options have been identified for the transmission format:
Option 1: Jointly coded/Fixed MCS
[Multiple unicast service control information elements are coded jointly to form a control block and the
same MCS is used for each coded control block that is transmitted.]
Option 2: Jointly coded/Variable MCS
[Multiple unicast service control information elements are coded jointly to form a control block and a
different MCS can be used for each coded control block that is transmitted.]
Option 3: Separately coded/Fixed MCS
[Multiple unicast service control information elements are coded separately and the same MCS is
used for each control information element that is transmitted.]
Option 4: Separately coded/Variable MCS
[Multiple unicast service control information elements are coded separately and a different MCS can
be used for each control information element that is transmitted.]
Pending Resolution: A resolution needs to be made on the inclusion of the following text related to information
common to all users scheduled in a sub-frame.
[Control information common to scheduled users is multicast, with fixed modulation and coding.]
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11.x.5.5.
3
Editors’ Notes :
4
This section depends on SDD text included in the DL PHY Structure
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11.x.6. Multicast Service Control Channels
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Editors’ Notes :
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8
This section is a placeholder for text to be developed based on SDD text that will be added to Section 15 of the
SDD (Support for Enhanced Multicast Broadcast Service).
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11.x.6.1.
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11.x.6.2.
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11.x.6.3.
Location of control blocks within a frame/subframe
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11.x.6.4.
Transmission format (e.g. modulation, coding, multiple antenna schemes)
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11.x.6.5.
Resource allocation (physical to logical mapping, pilots, block size)
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Editors’ Notes :
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This section depends on SDD text included in the DL PHY Structure
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11.x.7. Multi-carrier Control Structure
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Editors’ Notes :
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This section is a placeholders for text to be developed based on SDD text that will be added to Section 19 of the
SDD (Support for Multicarrier Operation).
[
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11.x.8. Mapping of information into control channels
Resource allocation (physical to logical mapping, pilots, block size)
Multicast service control information/content
Multiplexing scheme of data and multicast service control and (e.g. TDM, FDM,
Hybrid TDM//FDM)
Editors’ Notes:
Consensus: ‘Control information has been mapped to various control channels. Terminology is similar, but
needs further clarification and harmonization.
Pending Resolution: The mapping of information content to various control channels and the location of the
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control channels in the frame structure are pending resolution. A definition of ‘control channel’ is needed.
Since preamble design will depend on contributions submitted in Session #55 or later and will be developed by
rapporteur groups constituted to develop such text, the location of the SCH is TBD. The preamble may occur
once every frame/superframe and therefore may or may not be part of the SFH.
The following table assumes classification of the BCH into PBCH and SBCH. All entries related to
PBCH/SBCH should be changed to BCH if the classification is not adopted. See notes in section 11.x.3.1
Resolution on whether “Remaining essential system parameters and system configuration information” is
included “Essential system parameters and system configuration information” or in “Extended system
parameters and system configuration information” is required. Once the decision is made the table needs to be
reorganized.
Mapping for control and signaling for DL notifications and control and signaling for traffic are TBD.
Information
Synchronization information
[Network-wide common
essential system parameters
and system configuration
information]
Essential system parameters
and system configuration
information
[Sector-specific DL essential
system parameters and system
configuration information]
[Remaining essential system
parameters and system
configuration information]
Extended system parameters
and system configuration
information
Location
TBD
[Primary Broadcast Channel
(PBCH)]
Control and signaling for traffic
[Part of SFH]
[Secondary Broadcast
Channel (SBCH) ]
[Secondary Broadcast
Channel (SBCH) ]
[MAC management
messages]
[Secondary Broadcast
Channel (SBCH)]
TBD
]
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[Part of SFH]
[Primary Broadcast Channel
(PBCH)]
[MAC management
messages]
TBD
Control and signaling for DL
notifications
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Channel
Synchronization Channel
(SCH)
[Part of SFH]
[Outside SFH,
location TBD]
[Part of SFH]
[Outside SFH
location TBD]
Outside SFH,
location TBD
Outside SFH,
location TBD