ev do system messages 20050106 a 1.0
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EV-DO System Messages Internal open
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EV-DO System Messages
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EV-DO System Messages Internal open
Huawei Technologies Co., Ltd.
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Revision record
DateRevision
versionDescription Author
2004.1.15 V1.00 First draft completed Zeng Shuhui
2004.3.3 V1.01 Revision completed Nie Jimin
2004.12.1 V1.02 Revision completed Nie Jimin
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EV-DO System Messages Confidentiality
Table of Contents
EV-DO System Messages..........................................................................................................2
1.1 Introduction to System Messages.......................................................................................2
1.2 QuickConfig Message.........................................................................................................3
1.3 SectorParameters Message................................................................................................4
1.4 Sync Message..................................................................................................................... 7
1.5 AccessParameters Message...............................................................................................8
1.6 Redirect Message...............................................................................................................9
1.7 BroadcastReverseRateLimit Message..............................................................................10
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Key words:
Abstract: This document introduces EV-DO system messages and details field
meaning of different messages.
List of acronyms and abbreviations:
List of references:
1. Air Interface Specifications on CDMA2000 High Rate Packet Data Qualcomm
2. RF Engineering Guideline for 1xEV-DOSystem Lucent
3. CBSC6600V200R001 Top Design—System Messages Huawei
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EV-DO System Messages
1.1 Introduction to System Messages
This document introduces 1xEV-DO system messages. In the protocol,
overhead messages include QuickConfig and SectorParameters messages
only. In addition, there are other four types of message, namely, Sync.,
AccessParameters, BroadcastReverseRateLimit and Redirect messages
that are also sent on the control channel to control behavior of all terminals.
All the six messages are called system message and are sent through the
same mechanism at the BSC.
System messages are sent based on different periods shown in the
following table.
Table 1. Broadcast Parameters for System Messages
System message Broadcast frequency Sending
channel
Sync Once within TISPSync seconds CCsyn
QuickConfig Once at every CC CCsynSS
SectorParameters Once within NOMPSectorParameters
CC periods
CCsyn
AcessParameters Once within NACMPAccessParameters
slots
CCsyn
BroadcastReverseRateLimit Triggered by events and sent
in a non-period mode
CC
Redirect Triggered by events and sent
in a non-period mode
CC and
FTC
Where,
- FTC stands for forward traffic channel or control channel when the route
update protocol is in connection state.
- CC stands for control channel (synchronous or asynchronous packets)
- CCsyn stands for control channel synchronous packets (including
synchronous dormant packets of control channel).
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- CcsynSS stands for control channel synchronous dormant packets.
- AC stands for access channel.
SYNC message: sent once within TISPSync seconds at the BTS (TISPSync is
defaulted to 1.28 seconds, namely, three CC periods and each of them is
256 slot= 426.67ms)
QuickConfig message: sent once within each CC period at the BTS.
SectorParameter message: sent once within NOMPSectorParameters (defaulted to
four) CC periods at the BTS.
AccessParameter message: sent once within NACMPAccessParameters (defaulted to
3) CC periods at the BTS.
BroadcastReverseRateLimit message: used to restrict reverse peak rate of
all users at the local carrier. This message is triggered by events.
Redirect message: used to redirect terminals to other networks and
triggered by events. This message can be sent on the CC and all terminals
(including connected and disconnected terminals) under this carrier are
redirected to other networks. It can be also sent on the FTC and only one
specific terminal will be redirected to other networks.
1.2 QuickConfig Message
QuickConfig message and SectorParameters message are called
overhead message. The AN broadcasts these messages on the CC. They
are unique and should be specified because they belong to multiple
protocols. The overhead message protocol provides relevant processes to
transfer, receive and monitor these messages.
The access terminal (hereinafter referred as AT) should contain one
QuickConfig message in every CcsynSS. The access network (hereinafter
referred as AN) contains at least one SectorParameters message every
NOMPSectorParameters CC periods. In addition, the AN should set the
SectorSignature domain of the QuickConfig message to the
SectorSignature domain of the next SectorParameters Message, and the
AccessSignature domain of the QuickConfig message to AccessSignature
of public data.
In the active state, the AT should monitor QuickConfig and
SectorParameters messages.
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QuickConfig message is to reflect the change of the overhead message
and provide information on frequent change. Every CcsynSS in the AT
contains one QuickConfig message.
Table 1-1 Fields in the QuickConfig Message
Domain name Length Description
MessageID 8 /
ColorCode 8 Color code corresponding to a sector
SectorID24 24 Low 24-digit bit in the SectorID corresponding to a sector
SectorSignature 16 Sector signature value of the next SectorParameters message to be sent by the AN
AccessSignature 16 Access signature value of the next AccessParameters message to be sent by the AN
Redirect 1 Redirection. If the AN redirects all terminals to be away this AN, set this domain to “1”.
RPCCount 6 Maximum RPC channels supported by the sector
The following domains occurs for RPCCount times
ForwardTrafficValid
1 The AT monitors the FTC through this domain. If the FTC with 64-n MACIndex is valid, the AN sets value n of this domain to “1”. Otherwise, “0” should be set.
Reserved Changeable
Used to ensure the length of this message is integer times of fields. Set this domain to “0” if it exists.
1.3 SectorParameters Message
The AT should select one CDMA channel from the channel list of the
SectorParameters message if there is. Otherwise, the AT should adopt the
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channel that it is monitoring. If one or multiple channels are available, the
AT should use the Halsh function to calculate index number of the channel
list provided by this type of message.
Before sending an access probe, the AT must ensure the current
SectorParameters message is up to date, which can be known by verifying
whether SectorSignature values in the QuickConfig message and latest
SectorParameters message are the same.
The AN should have at least one SectorParameters message in the
synchronous packet every OMPSectorParameters (defaulted to 4) CC periods. The
SectorParameters message is used to transfer specific sector messages to
the AT.
Table 1-2 Fields in the SectorParameters Message
Domain name Length Description
MessageID 8 /
CountryCode 12 Mobile country code
SectorID 128 Sector address identifier
SubnetMask 8 Subnet mask identifier of a sector, namely, the number of continuous “1” in the subnet mask
SectorSignature 16 SectorParameters signature (sequence number of the message)
Latitude 22 Latitude of the sector
Longtitude 23 Longitude of the sector
RouteUpdateRadius 11 0: The sector does not perform distance-based route update.
Non-0: Message The AT will send a new RouteUpdate message beyond this distance
LeapSeconds 8 Times of leap second after the system time starts.
LocalTimeOffset 11 Difference between the local time and the system time
ReverseLinkSilenceDuration 2 Unit: frame, duration between reverse link silent sectors
ReverseLinkSilencePeriod 2 Period between reverse link silent sectors. It is defined as the time interval of the frame which is started at T time and lasts ReverseLinkSilenceDuration. T is CDMA system time with the
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frame as the unit and satisfies:
T mod (2048×2ReverseLinkSilencePeriod-1)=0
ChannelCount 5 Channels under this sectors, available to the AT
The following domains occur for ChannelCount times:
Channel 24 Channel number including SystemType, BandClass and ChannelNumber
NeighborCount 5 Neighbor sectors
The following domains occur for NeighborCount times:
NeighborPilotPN 9 PN of neighbor sectors
The following two domains occur for NeighborCount times:
NeighborChannelIncluded 1 If the channel record of this neighbor sector is included, the AN sets this domain to “1”. Otherwise, “0” should be set.
NeighborChannel 0 or 24 Description of neighbor channel record, including SystemType, BandClass and ChannelNumber
NeighborSearchWindowsSizeIncluded 1 If the search window record of this neighbor sector is included, the AN sets this domain to “1”. Otherwise, “0” should be set.
The following domains occur for NeighborCount times:
NeighborSearchWindowsSize 0 or 4 Search window size used by neighbor pilots
NeighborSearchWindowsOffsetIncluded
1 If the search window offset used by this neighbor pilot is included, the AN sets this domain to “1”. Otherwise, “0” should be set.
The following domains occur for NeighborCount times:
NeighborSearchWindowsOffset 0 or 3 Search window offset used by neighbor pilots
Reserved Changeable
Used to ensure the length of this message is integer times of fields. Set this domain to “0” if it exists.
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Table 1-3 Search Window Size
SearchWindowSize value
Search window size (PN chip)
0 4
1 6
2 8
3 10
4 14
5 20
6 28
7 40
8 60
9 80
10 100
11 130
12 160
13 226
14 320
15 452
Table 1-4 Search Window Offset
SearchWindowsOffset value
Offset (PN chip)
0 0
1 WindowSize34/2
2 WindowSize
3 3×WindowSize/2
4 -WindowSize/2
5 -WindowSize
6 -3×WindowSize/2
7 Reserved
1.4 Sync Message
The AT receives Sync message in the synchronous state. In this state, the
AT should send ControlChannelMAC.Deactivate command and enter
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network confirmation state if it does not successfully receive the Sync
message within TISPSyncAcq. When attempting to receive this Sync message,
the AT will discard other all messages on the CC. After receiving one Sync
message, the AT should compare the largest and the smallest version
number. If the version number is beyond the specified range, the AT will
send ControlChannelMAC.Deactivate command and enter network
confirmation state. Otherwise, perform time synchronization and return
NetworkAcquired instruction to enter non-active state. Syn message is
similar to syn channels in 1x.
The AN periodically broadcasts Syn message in the synchronous CC
packet to transfer basic network and timing messages. Note that this
should not exceed TISPSync (defaulted to three CC periods, 1.28s).
Table 1-5 Fields in the Sync Message
Domain name Length
Description
MessageID 2 /
MaximumRevision
8 Maximum air interface protocol version supported by the AN
MinimumRevision
8 Minimum revision air interface protocol version supported by the AN
PilotPN 9 PN offset of sector pilots
SystemTime 37 The system time 160ms after the period of the CC to which this Sync message is sent starts. The unit of this system time is 26.667ms.
1.5 AccessParameters Message
AccessParameters message is used to transfer AccessChannel message
to the AT. Before sending the first probe in the first probe sequence, the AT
should verify whether the AccessParameters message is up to date. If it is
not, start TACMPAPSupervision monitoring timer to update access parameters.
The AN sends at least one AccessParameters message within
NACMPAccessParameter (defaulted to three CC periods, namely, 3×256=768) slots.
Table 1-6 Fields in the AccessParameters Message
Domain name Length Description
MessageID 8 /
AccessCycleDuration
8 Time the access channel period lasts; and its unit is slot.
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AccessSignature 16 Signature of the AccessParameters message
OpenLoopAdjust 8 Negative of nominal power used by the AT to estimate open loop power, expressed as a 1dB value without any sign.
ProbeInitialAdjust 5 Correction factor adopted by the AT to initially perform transmission on the access channel during open loop power estimation
ProbeNumStep 4 Maximum probe numbers that can be accessed and are transmitted by the AT in the single access probe sequence. The value range is [1, 15].
PowerStep 4 Probe power increment
PreambleLength 3 Frame length of access probe preamble
CapsuleLengthMax 4 The length of the largest access channel packet. The value range is [2, 15] and its unit is frame.
The following domains occur for NACMPAPersist times:
APersistence 6 Access persistence vector
0x3F: the persistence probability is 0
Non-0x3F: the persistence probability is 2-n/4
Reserved Changeable
Used to ensure the length of this message is integer times of fields. Set this domain to “0” if it exists.
1.6 Redirect Message
The AN sends Redirect message to redirect the AT to leave the current
network. This message can be sent on the CC or the FTC. When it is sent
on the CC, all terminals (including connected and disconnected terminals)
under the carrier where the CC is located will be redirected to other
networks. When it is sent on the FTC, a specific terminal will be redirected
to other networks.
After the AN adopts the event trigger mechanism to send this message,
and the BSC judges whether to send it based on algorithm.
Table 1-7 Fields in the Redirect Message
Domain name Length Description
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MessageID 8 /
NumChannel 8 Directed channels of the target network
The following is an example of NumChannel:
Channel 24 Channels the AT should re-trap, including SystemType., BandClass and ChannelNumber
1.7 BroadcastReverseRateLimit Message
The AN adopts BroadcastReverseRateLimit message to control the peak
transmission rate of reverse links of all active terminals under a specific
sector. It can be set separately for every user based on MACIndex.
The AN adopts the event trigger mechanism to send this message and the
BSC judges whether to send it based on algorithm.
Table 1-8 Fields in the BroadcastReverseRateLimit Message
Domain name
Length Description
MessageID 8 /
RPCCount 6 Maximum RPCs supported by the sector
The following domains occur for RPCCount times:
RateLimit 4 The AN sets the value n of this domain to the peak data rate that is related to MACIndex 64-n and can be used by the AT on the RTC.
Reserved Changeable
Used to ensure the length of this message is integer times of fields. Set this domain to “0” if it exists.
Table 1-9 RateLimit Domain Code
Domain value
Meaning
0x0 0kbps
0x1 9.6kbps
0x2 19.2kbps
0x3 38.4kbps
0x4 76.8kbps
0x5 153.6kbps
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