Transcript Slides S802.16m-08/955

A transmission scheme of DL Control information
for Multi-carrier support in IEEE
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16m-08/955
Date Submitted:
2008-09-05
Source:
Nan Li, Min Liu, Changyin Sun, Wenhuan Wang,
Ruixia Zhang, Huiying Fang, Yuqin Chen
Voice:
E-mail:
[Telephone Number (optional)]
[email protected]
ZTE Corporation
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Venue:
Re:Multi-Carrier Operation; in response to the TGm Call for Contributions and Comments 802.16m-08/033 for Session 57
Base Contribution:
IEEE C802.16m-08/955r1
Purpose:
To be discussed and adopted by TGm for use in the IEEE 802.16m SDD.
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Background
• Carriers of a multi-carrier system may be configured as fully
configured carrier and partially configured carrier in SDD:

Fully configured carrier: A carrier for which all control channels including
synchronization, broadcast, multicast and unicast control signaling are
configured. Further, information and parameters regarding multi-carrier
operation and the other carriers can also be included in the control channels.
 Partially configured carrier: A carrier with only essential control channel
configuration to support traffic exchanges during multi-carrier operation.
• PBCH and SBCH are used to transmit essential system parameters
and system configuration information.
• DL control information also includes extended system parameters
and system configuration information, control and signaling for DL
notifications and control and signaling for traffic.
Problems
• How PBCH, SBCH and other DL control information are configured on
fully configured carriers and partially configured carriers ?
→ Needs a clarification about the configuration of DL control information on these
two kinds of carriers for the benefit of system overhead reduction and improvement
of transmission efficiency.
• In the case partially configured carrier has SCH, the MS could not acquire
complete control and system information after finishing synchronization
and has to scan other DL frequency again. There will be long access delay
if MS has to decode the whole BCH information to find the configuration
of the carrier.
→ This contribution proposes a Superframe control header（SFCH）to solve this
problem.
BCH Considerations in multi-carrier system
PBCH solution
• All the MSs in a cell complete network entry through fully configured
carriers.
– Each fully configured carrier needs to be configured with PBCH.
– MS gets deployment-wide common information during Initialization State.
– After network entry, if the serving BS assigns partially configured carriers
to MS as secondary carriers or do carrier switch for the purpose of system
load balancing or QoS requirement according to the MS’s multi-carrier
capability, MS may use the PBCH information acquired during network
access.
PBCH information could only be sent on fully
configured carriers with fixed length.
BCH Considerations in multi-carrier system
SBCH solution
• SBCH information may change along with the sector’s configuration and
the carrier’s operation.
–
Single-radio MS
• If uses a partially configured carrier as its secondary carrier, MS should
return to its primary carrier periodically or event-triggered for
maintaining control by the BS, therefore, the SBCH information may
be sent on partially configured carrier for the convenience of MS’s
work.
• Information about initial ranging may not be sent on partially
configured carrier since it would not be used for the purpose of access.
–
Multi-radio MS
May simultaneously working on one or more fully configured carriers and
/or partially configured carriers, thus the SBCH information may be
configured only on fully configured carriers.
Two methods to send SBCH information could be applied.
BCH Considerations in multi-carrier system
SBCH solution
• Option 1
Configured on both fully configured carrier and partially configured carrier.
• Option 2
Configured only on fully configured carriers. SBCH information about
partially configured carriers will be sent by one or more fully configured
carriers MS is working with in the following three ways:
– Unicast
• A partially configured carrier is assigned to MS, or traffic switches
from one partially configured carrier to another.
• Information may be a complete one or just information different from
the current carrier.
– Multicast
A group of MSs which work on the same fully configured carrier and have
been assigned the same target partially configured carrier.
– Broadcast
DL control information configuration on
fully/partially carrier
Information
Channel
Carrier
configuration
Deployment-wide
common information
PBCH
Fully
Downlink sector-specific
information
SBCH
Fully
Partially
Extended system
parameters and
system
configuration
information
FFS
Fully
Partially
Control and
signaling for DL
notifications
FFS
Fully
Partially
Control and
signaling for traffic
USCCH
Fully
Partially
Essential system
parameters and
system
configuration
information
Uplink sector-specific
information
Superframe control header (SFCH)
• 16m Superframe control header (SFCH)
– Transmitted in every Superframe
– Predefined transmission format , length and MCS
– Fixed location : may be TDM with SCH and followed
by BCH.
MS can decode SFCH without any other information.
Superframe control header (SFCH)
SFCH format
Syntax
Size
Notes
PBCH indicator (PI)
1
0: PBCH is not present
1: PBCH is present
SBCH indicator(SI)
1
0: SBCH is not present
1: SBCH is present
SBCH length
Reserved
Only fully configured carriers need to be configured with PBCH.
→ PI : specify the existence of PBCH. PI=1 means PBCH is present.
→ PBCH is transmitted using predetermined scheme with fixed length and right
after the SFCH, if PI=1.
→ SI and SBCH length: indicate the presence and the size of SBCH, which should
be known by MS before decoding SBCH.
MS only needs to decode SFCH after synchronization to determine
whether the current carrier is fully configured and continue to
decode the whole BCH.
Proposed SDD text
• 19.x DL broadcast information for Multi-carrier
support
Each fully configured carrier needs to be configured with PBCH. After
network entry, the serving BS may assign another carrier to MS as
secondary carrier or do carrier switch for the purpose of system load
balancing or QoS requirement according to the MS’s multi-carrier
capability. PBCH information could only be sent on fully configured
carriers with fixed length.
Proposed SDD text
SBCH information may be transmitted through either of the following two
options:
Option 1:
SBCH can be configured on both fully configured carrier and partially
configured carrier.
Option 2:
SBCH can be configured only on fully configured carriers. SBCH
information about partially configured carriers will be sent by one or more
fully configured carriers MS is working with.
Proposed SDD text
• 19.x.1 Superframe control header (SFCH)
A Superframe control header (SFCH) is used to indicate the configuration
of a carrier in the case that partially configured carrier has SCH. A PBCH
indicator (PI) Bit in SFCH specifies the existence of PBCH. PI=1 means
PBCH is present. PBCH is transmitted using predetermined scheme with
fixed length and right after the SFCH, if PI=1. SFCH indicator（SI）Bit
and SBCH length are used to indicate the presence and the size of SBCH.
SFCH should be transmitted with predefined transmission format, length,
MCS and location . SFCH may be TDM with SCH and followed by BCH.
Proposed SDD text
The structure of SFCH is shown in Table 1.
Table 1 SFCH format
Syntax
Size
Notes
PBCH indicator (PI)
1
0: PBCH is not present
1: PBCH is present
SBCH indicator(SI)
1
0: SBCH is not present
1: SBCH is present
SBCH length
Reserved