Simple Half-rate phase detector detects Df but has no reference!
01 12 Half Rate Service
-
Upload
prasoon-singh -
Category
Documents
-
view
216 -
download
0
Transcript of 01 12 Half Rate Service
-
7/30/2019 01 12 Half Rate Service
1/36
12Half-Rate ServiceAbout This Chapter
12.1 Overview
The half-rate service is optional.
12.2 Availability
Availability of the half-rate service consists of the related NEs, software version information,
and license in the number of TRXs supporting the half-rate service.
12.3 Technical Description
The technical description of the half-rate service consists of the channel assignment strategiesrelated to the half-rate service, the rate adjustment algorithms, and the resource reservation
function involved in the rate adjustment. The rate adjustment consists of the adjustment from a
half-rate channel to a full-rate channel and from a full-rate channel to a half-rate channel.
12.4 Capabilities
BSC6000V900R001C01 supports up to 2048 TRXs used in the half-rate service.
12.5 Implementation
The implementation on the half-rate service consists of configuring half-rate service, verifying
half-rate service, activating the function of reserving priority resources, adjusting half-rate
service, and deactivating half-rate service.
12.6 Maintenance InformationMaintenance information on half-rate service consists of the performance counters related to the
half-rate service.
12.7 References
None.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-1
-
7/30/2019 01 12 Half Rate Service
2/36
12.1 Overview
The half-rate service is optional.
Definition
The half-rate service is a service where the speech coding rate is reduced to half the full-rate
speech coding rate through a new speech coding algorithm. If the half-rate service is enabled,
the physical channel carrying the service of only one calling MS can be able to bear the services
of two calling MSs.
Purposes
If the half-rate service is enabled, the number of system-enabled MSs holding speech services
is doubled without the addition of TRXs. Thus the frequency reuse rate is enhanced. Therefore,
the telecom operators can fully utilize the network resources and minimize the operation cost.
Terms
Term Definition
Couple A timeslot is composed of two half-rate
subtimeslots. If both half-rate subtimeslots
are idle, the channel where the two
subtimeslots are located is called a Couple.
Single A timeslot is composed of two half-rate
subtimeslots. If one subtimeslot is occupied
and the other subtimeslot is idle, the channel
where the idle subtimeslot is located is called
a Single.
TCHF Full-rate speech channel
TCHH Half-rate speech channel
Rate adjustment The conversion from a full-rate channel to a
half-rate channel or from a half-rate channel
to a full-rate channel
Half-rate version 1 HR data (with the rate of 5.6 kbit/s)
Half-rate version 2 Reserved for protocols
Half-rate version 3 HAMR data (with the rate ranging from 4.75
to 7.4 kbit/s)
Full-rate version 1 FR data (with the rate of 13 kbit/s)
Full-rate version 2 EFR data (with the rate of 12.2 kbit/s)
Full-rate version 3 FAMR data (with the rate ranging from 4.75
to 12.2 kbit/s)
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-2 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
3/36
Abbreviations
Abbreviation Full Spelling
AMR Adaptive Muti-Rate
EFR Enhanced Full Rate
FR Full Rate
HR Half Rate
12.2 Availability
Availability of the half-rate service consists of the related NEs, software version information,
and license in the number of TRXs supporting the half-rate service.
Network Elements Involved
Table 12-1 describes the NEs involved in the half-rate service.
Table 12-1 NEs Involved in the Half-Rate Service
MS BTS BSC MSC MGW SGSN GGSN HLR
NOTE
l -: not involved
l : involved
Software Releases
Table 12-2 describes the software releases that support the half-rate service.
Table 12-2 GBSS products and related versions
Product VersionBSC BSC6000 V900R001C01 and
later releases
BTS BTS3X G3BTS32.30000.01.11
30 and later releases
BTS3002C G3BTS36.30000.02.08
20 and later releases
BTS3001C G3BTS34.30000.07.03
01
Double-transceiver BTSs All releases
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-3
-
7/30/2019 01 12 Half Rate Service
4/36
Miscellaneous
Only when the license is obtained, the half-rate service can be enabled.
The license in the number of TRXs supporting the half-rate service needs to be requested for.
The number of TRXs supporting the half-rate service must be within the range allowed by thelicense so that the TRXs can work normally.
12.3 Technical Description
The technical description of the half-rate service consists of the channel assignment strategies
related to the half-rate service, the rate adjustment algorithms, and the resource reservation
function involved in the rate adjustment. The rate adjustment consists of the adjustment from a
half-rate channel to a full-rate channel and from a full-rate channel to a half-rate channel.
The dynamic rate adjustment is triggered in the channel assignment procedure. Thus, the rate
can be adjusted in real time.
Based on the channel request type, the full-rate or half-rate selection procedure is triggered only
when the type of the request channel is half rate TCH only, half rate TCH preferable, full rate
TCH only, orfull rate TCH preferable.
After the
TCH Rate Adjust Allow is enabled, for the channels that are not requested for in the immediate
assignment procedure or the handover channel requests caused by the dynamic adjustment of
other channels, the dynamic adjustment from a full-rate channel to a half-rate channel is triggered
if a half-rate channel is requested for. If a full-rate channel is requested for, the dynamic
adjustment from a half-rate channel to a full-rate channel is triggered and a handover may be
triggered.
12.3.1 Channel Assignment Strategies
If the half-rate service is enabled, the BSC selects different channel assignment algorithms based
on the channel assignment strategies in the data configuration after the BSC receives an
Assignment Request message from the MSC.
12.3.2 Rate Adjustment Algorithms
Rate adjustment algorithms consist of different request types of rate adjustment algorithms and
the full-rate and half-rate adjustment procedures.
12.3.3 Function of Reserving Priority Resources
If the applied channel is a TCH, an appropriate TCH needs to be found in the current resources.
If the configured channel is a full-rate speech channel, you need consider the function ofreserving the priority resources.
12.3.4 Estimation of the Number of the Full-Rate and the Half-Rate Channels in a Cell
In some situations, users need estimate the number of the full-rate and half-rate channels in a
cell.
12.3.1 Channel Assignment Strategies
If the half-rate service is enabled, the BSC selects different channel assignment algorithms based
on the channel assignment strategies in the data configuration after the BSC receives an
Assignment Request message from the MSC.
There are two channel assignment strategies:
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-4 Huawei Technologies Proprietary Issue 01 (2007-09-05)
http://-/?-http://-/?- -
7/30/2019 01 12 Half Rate Service
5/36
l Channel rate assignment strategy controlled by the MSC
l Channel rate assignment strategy controlled by the BSC
By default, the channel rate assignment strategy controlled by the BSC is used.
In channel assignment algorithms, the system determines whether to assign half-rate channels
or full-rate channels based on the traffic volume of the network. If the channel seizure ratio
exceeds the TCH Traffic Busy Threshold, you can infer that the current network is busy. If
the network is busy, half-rate channels are assigned preferably. If the network is not busy, full-
rate channels are assigned preferably.
NOTE
Channel seizure ratio = (Number of busy full-rate channels + Number of busy half-rate channels/2)/
(Number of available full-rate channels + Number of available half-rate channels/2) x 100%
12.3.2 Rate Adjustment Algorithms
Rate adjustment algorithms consist of different request types of rate adjustment algorithms and
the full-rate and half-rate adjustment procedures.
12.3.2.1 Different Request Types of Rate Adjustment Algorithms
Rate adjustment algorithms vary with the types of rates for requested channels.
12.3.2.2 Full-Rate/Half-Rate Adjustment Procedure
Full-rate/half-rate adjustment consists of the adjustment from a full-rate channel to a half-rate
channel and the adjustment from a half-rate channel to a full-rate channel.
Different Request Types of Rate Adjustment AlgorithmsRate adjustment algorithms vary with the types of rates for requested channels.
There are three types of channel rates in a channel assignment request:
l full rate TCH only
l half rate TCH only/half rate TCH preferable
l full rate TCH preferable
If the type ofthe rate in a channel assignment request is full rate TCH only, the channel request
is accepted when the following requirements are met. If the type of the rate in a channel
assignment request is not full rate TCH only or if the following requirements are not met, thechannel request is rejected.
l If there are idle full-rate channels, they are assigned directly.
l If there is no idle full-rate channel but there is an idle Couple, the BSC converts the Couple
into a full-rate channel, and then assign the full-rate channel.
l If there is no idle full-rate channel and there is no idle Couple, but there is an idle Single,
the BSC determines whether the number of adjustable idle half-rate channels in a cell
exceeds 1. If the number of adjustable idle half-rate channels in a cell exceeds 1, an intra-
cell handover is initiated. The BSC coverts the Couples after the handover into full-rate
channels, and then assigns the full-rate channels. If the number of adjustable idle half-rate
channels in a cell does not exceed 1, the channel assignment request is rejected.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-5
http://-/?-http://-/?- -
7/30/2019 01 12 Half Rate Service
6/36
Figure 12-1 Full Rate TCH Only Channel Adjustment Procedure
Yes
No
No
Yes
No
Yes
Start
Whether there
are appropriate full-rate
channels?
TCHF only requests
Whether there are
appropriate
Couple channels?
Whether there aremore than one half-rate
channels?
Convert all the Couple
channels into the full-rate channels
Initiate an intra-cell handover,
and then convert all the Couplechannels formed after the
handover into the full-rate channels
Assign full-rate channelsReject requests
End
If the type of the rate in a channel assignment request is half rate TCH only or half rate TCH
preferable, the channel request is accepted when the following requirements are met. If the type
of the rate in a channel assignment request is not half rate TCH only or half rate TCH preferable,
or if the following requirements are not met, the channel request is rejected.
l If there is an idle Single, you can assign the Single directly.
l If there is no idle Single but there is an idle Couple, the BSC assigns the idle half-rate
channel on the Couple.
l If there is no idle Single and there is no Couple, but there is an idle full-rate channel, an
adjustment is triggered. The BSC converts the full-rate channel into a Couple, and thenassign the idle half-rate channel on the Couple.
NOTE
If the BSC assigns the channels on Singles preferably, the half-rate channels can be seized collectively
and fragments can be minimized.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-6 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
7/36
l Figure 12-2 Half Rate TCH Only/Half Rate TCH Preferable Channel Adjustment
Procedure
Yes
No
No
Yes
No
Yes
Start
Whether there are
appropriate
single channels?
Half-rate request
Whether there are
appropriate
couple channels?
Whether there are
appropriate
full-rate channels?
Convert the
full-rate channels into the
Couple trannels
Assign the
full-rate channelsChannels fail to be assigned
End
If the type of the rate in a channel assignment request is full rate TCH preferable, the channel
request is accepted when the following requirements are met. If the type of the rate in a channel
assignment request is not full rate TCH preferable or the following requirements are not met,
the channel request is rejected.
l If there are idle full-rate channels, they are assigned directly.
l If there is no idle full-rate channel but there is an idle Couple, the BSC converts the Couple
into a full-rate channel, and then assign the full-rate channel.
l
If there is no idle full-rate channel and there is no idle Couple, but there is an idle Single,the BSC determines whether the number of adjustable idle half-rate channels in a cell
exceeds 1. If the number of adjustable idle half-rate channels in a cell exceeds 1, an
adjustment is triggered and an intra-cell handover is initiated. The BSC coverts the Couples
after the handover into full-rate channels, and then assigns the full-rate channels. If the
number of adjustable idle half-rate channels in a cell does not exceed 1, the BSC assigns
the idle Single.
NOTE
Only when the Enhanced TCH Adjust Allowed is enabled, the calls on a Single can be handed over and
then an adjustment is triggered when a half-rate channel is converted into a full-rate channel.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-7
http://-/?- -
7/30/2019 01 12 Half Rate Service
8/36
Full-Rate/Half-Rate Adjustment Procedure
Full-rate/half-rate adjustment consists of the adjustment from a full-rate channel to a half-rate
channel and the adjustment from a half-rate channel to a full-rate channel.
Adjustment from a Full-Rate Channel to a Half-Rate Channel
1. If the related resources are not assigned for the channel application, the channel application
enters the queue. The queuing duration is set through the "Timer of Waiting Channel Adjust
(ms)." By default, the duration is three seconds.
l Queuing fails
For the application for full-rate only or half-rate only type, the queuing fails.
For the application for full-rate preferred or half-rate preferred, channels that are
selected secondarily, such as, Couples or full-rate channels are assigned. For detailed
decision procedure, refer to Figure 12-3. The procedure is complete.
Figure 12-3 Half Rate TCH Only/Half Rate TCH Preferable Channel Adjustment
Procedure
Yes
No
No
Yes
No
Yes
Start
Whether there are
appropriate
single channels?
Half-rate request
Whether there are
appropriate
couple channels?
Whether there are
appropriatefull-rate channels?
Convert the
full-rate channels into theCouple trannels
Assign the
full-rate channelsChannels fail to be assigned
End
l Queuing succeeds
The BSC adjusts a full-rate channel to two Couples, sets the necessary values of channel
attributes, initiates the command of adjusting the BSC timeslots, initiates the "Timer of
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-8 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
9/36
Waiting BMRC Response(ms)", and takes statistics of related performance
measurement.
2. The BSC sends the command of adjusting and setting the channel attributes to the BTS
before adjusting the BSC timeslots. If the time of processing the commands of adjusting
the BSC timeslots and adjusting the channel types that are sent to the BTS expires, as longas the system is normal, the adjustment command is reinitiated.
3. After receiving the command, the BTS starts converting channels. After channels are
converted, the BTS sends the "Status Change Report" to the BSC.
4. After receiving the "Status Change Report", the BSC set the converted Couples to idle and
available. The BSC completes the adjustment and takes statistics of related performance
measurement.
Adjustment from a Half-Rate Channel to a Full-Rate Channel
1. If the current channel is a Couple, the corresponding channel application enters the queue.
The queuing duration is set through the "Timer of Waiting Channel Adjust (ms)." By
default, the duration is three seconds.
l Queuing fails
For the application for full-rate only or half-rate only type, the queuing fails.
For the application for full-rate preferred or half-rate preferred, channels that are
selected secondarily, such as, Couples or Singles are assigned. For detailed decision
procedure, refer to Figure 12-4 and Figure 12-5. The procedure is complete.
Figure 12-4 Full Rate TCH Only Channel Adjustment Procedure
Yes
No
No
Yes
No
Yes
Start
Whether there
are appropriate full-rate
channels?
TCHF only requests
Whether there are
appropriate
Couple channels?
Whether there are
more than one half-rate
channels?
Convert all the Couple
channels into the full-rate channels
Initiate an intra-cell handover,and then convert all the Couple
channels formed after the
handover into the full-rate channels
Assign full-rate channelsReject requests
End
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-9
-
7/30/2019 01 12 Half Rate Service
10/36
Figure 12-5 Full Rate TCH Preferable Channel Adjustment Procedure
Yes
No
No
Yes
No
Yes
Start
Whether there are
appropriate
full-rate channels?
TCHF preferred request
Whether there areappropriate Couple
channels?
Whether there are
more than one half-rate
channels?
Convert all the Couple
channels into the full-rate channels
Initiate an intra-cell handover
and convert the Couple
channels formed after the
handover into the full-ratechannels
Assign the full-rate channelsAssign the half-rate channels
End
l Queuing succeeds
The BSC adjusts two Couples to a full-rate channel. For the subsequent procedure, refer
to Adjustment from a Full-Rate Channel To a Half-Rate Channel. The BSC sets
the necessary values of channel attributes, initiates the command of adjusting the BSC
timeslots, informs the BTS of completing the channel conversion, and takes statistics
of related performance measurement.
2. If the current channel is a Single, the corresponding channel application enters the queue.
The queuing duration is set to 5.5 seconds. Because the defragmentation requires a longtime.
l Queuing fails
For the application for full-rate only or half-rate only type, the queuing fails.
For the application for full-rate preferred or half-rate preferred, the Single is
assigned. For detailed decision procedure, refer to Figure 12-4. The procedure is
complete.
l Queuing succeeds
The system initiates an mandatory intra-cell handover on another occupied half-rate
channel that is corresponding to the Single. The handover is not controlled by the related
configuration of handover. The system initiates the "Timer of Waiting CRDLC HOResponses(s)" and reserves sufficient time for the intra-cell handover.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-10 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
11/36
Different processings are performed based on whether a forced handover response is
received.
If a forced handover response is received, the "Timer of Waiting CRDLC HO
Responses(s)" is stopped. The BSC judges whether the forced handover successes.
If the forced handover fails, an appropriate call needs to be found in the queue toassign the Single. The other occupied half-rate channel is not released. If the forced
handover succeeds, the channel status is set to waiting for releasing the channel,
when the channel status is set as the service is idle, refer to the Couple adjustment
procedure to perform the dynamic adjustment.
If a forced handover response is not received, but the "Timer of Waiting CRDLC
HO Responses(s)" expires, the handover fails. A handover failure procedure is
performed.
12.3.3 Function of Reserving Priority Resources
If the applied channel is a TCH, an appropriate TCH needs to be found in the current resources.
If the configured channel is a full-rate speech channel, you need consider the function of
reserving the priority resources.
This function can be performed to reserve some full-rate speech channels for the high-priority
users so that the quality of services for the high-priority users can be improved.
12.3.4 Estimation of the Number of the Full-Rate and the Half-RateChannels in a Cell
In some situations, users need estimate the number of the full-rate and half-rate channels in a
cell.
Available Information
The traffic volume in a cell is 1 Erl and the call loss rate that is permitted by an operator is B%.
Therefore, the number of the required channels in the cell is n. If the number of TRXs in the cell
is m, the number of the service timeslots that can be supplied by the cell is a. Therefore, the
number of service channels that can be supplied by the cell ranges from a to 2a.
Rules
Based on the traffic volume (1 Erl) and the allowed call loss rate described in ERLANG B, the
number of the channels required in the cell is n.
l If n n > a, the number of the TCHFs (f) configured in the cell must meet the condition,
that is, f + 2 (a-f) > n (f = [2a-n]). Other timeslots are configured as the TCHHs.
l If n >= 2a, small number of the service channels (one or two channels) are configured as
the TCHFs in the cell. Other channels in the cell are configured as the TCHHs. At the same
time, Huawei recommends an expansion for the cell. The configured TCHFs are mainly
reserved for the MSs that can use only TCHFs. The call loss rate is greater than B%.
Examples
If a cell holds two TRXs, the cell is configured with one BCCH and two SDCCHs.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-11
-
7/30/2019 01 12 Half Rate Service
12/36
Based on ERLANG B, if the traffic volume is X, the number of configured channels is 10. The
number of channels that can be used as TCHs in the cell is 13 (2 x 8 - 3). Because 13 > 10, all
the channels in the cell can be configured as TCHFs.
Based on ERLANG B, if the traffic volume in the cell is Y, the number of configured channels
is 17 and the number of channels that can be used as TCHs in the cell is 13. Because 13 x 2 >17 > 13, Nine (2 x 13 - 17) channels in the cell should be configured as TCHFs. Other channels
in the cell are configured as TCHHs.
Based on ERLANG B, if the traffic volume in the cell is Z, the number of configured channels
is 28 and the number of channels that can be used as TCHs in the cell is 13. Because 28 > 13 x
2, all the channels in the cell should be configured as TCHHs. At the same time, Huawei
recommends that a user should perform an expansion.
NOTE
The method of configuring the full-rate and half-rate channels described previously is only a simple
calculation method. The support capability of MSs for the full-rate and half-rate channels and the channel
assignment strategies are not considered. In fact, the call loss rate in a cell is related to these factors.
Therefore, Huawei recommends that the method described previously should be used as a rough estimation
method used when the half-rate service is enabled in a cell. After the half-rate service is enabled, you need
perform further optimization based on an actual situation in the network.
12.4 Capabilities
BSC6000V900R001C01 supports up to 2048 TRXs used in the half-rate service.
12.5 ImplementationThe implementation on the half-rate service consists of configuring half-rate service, verifying
half-rate service, activating the function of reserving priority resources, adjusting half-rate
service, and deactivating half-rate service.
12.5.1 Configuring Half-Rate Parameters
Configure the half-rate parameters through the BSC6000 Local Maintenance Terminal.
12.5.2 Verifying Half-Rate Service
Based on different channels configured on TRXs, the verification methods are different.
12.5.3 Enabling the Function of Reserving Priority ResourcesEnable the function of reserving priority resources through the BSC6000 Local Maintenance
Terminal.
12.5.4 Reconfiguring Half-Rate Parameters
Reconfigure the half-rate parameters through the BSC6000 Local Maintenance Terminal.
12.5.5 Disabling Half-Rate Service
Disable the half-rate service through the BSC6000 Local Maintenance Terminal.
12.5.1 Configuring Half-Rate Parameters
Configure the half-rate parameters through the BSC6000 Local Maintenance Terminal.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-12 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
13/36
Procedure
Step 1 Apply for and activate the license
1. To apply for the license for the half-rate service, in theBSC6000V900R001 Exceptional
Commercial License Application Template, you should fill in the number of the TRXs thatsupport half-rate service in a specified range in the corresponding row ofNumber of the
TRX supporting half-rate in the Resource control items column.
2. Enable the license on the BSC6000 Local Maintenance Terminal. For details, refer to
Activating License.
After the license is activated, the BSC supports the half-rate service. However, you still need to
set the attributes of related objects and parameters through the BSC6000 Local Maintenance
Terminal.
Step 2 Configure the half-rate speech version
NOTE
The half-rate speech versions that the BSC supports consist of Half-rate Version 1, Half-rate Version 2,
and Half-rate Version 3. Half-rate Version 2 in speech versions configured through the
BSC6000 Local Maintenance Terminal is reserved for protocols. Currently, no services are available.
1. On the BSC6000 Local Maintenance Terminal, right-click a cell on the Management
Tree tab page, and choose Configure Cell Attributes from the shortcut menu. A dialog
box is displayed, as shown in Figure 12-6.
Figure 12-6 Configuring Cells Attributes dialog box (1)
2. Double-clicka corresponding cell in the Cell view area, and then add it to the list of the
Selected cells.
3. Click Next. A dialog box is displayed, as shown in Figure 12-7.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-13
http://-/?-http://-/?- -
7/30/2019 01 12 Half Rate Service
14/36
Figure 12-7 Configuring Cells Attributes dialog box (2)
4. In the Cells to be set area, select a corresponding cell. Then, clickSet Cell Properties. A
dialog box is displayed, as shown in Figure 12-8.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-14 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
15/36
Figure 12-8 Set Cell Attributes dialog box
5. Click Call Control. A dialog box is displayed, as shown in Figure 12-9.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-15
-
7/30/2019 01 12 Half Rate Service
16/36
Figure 12-9 Setting call control parameters
6. Click Advanced. A dialog box is displayed, as shown in Figure 12-10.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-16 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
17/36
Figure 12-10 Set Call Control Parameter[Cell: BTS22C] dialog box
7. Click Access Control tab. On the tab page, set the value ofSpeech Version to Support
Half-rate Version 1, as shown in Figure 12-11.
Figure 12-11 Setting speech versions
8. Click OKto return to the dialog box shown in Figure 12-8.
9. Click OKto save the configuration of cell parameters. A previous dialog box is displayed,
as shown in Figure 12-7.
10. Click Finish to end the configuration.
Step 3 Adjust the type of the TRX channel as "TCH Half Rate"
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-17
http://-/?- -
7/30/2019 01 12 Half Rate Service
18/36
NOTE
The standard of selecting the type of a channel is as follows:
l If the half-rate channels are configured fixedly, the type of the channel is adjusted as "TCH Half Rate."
l If the full-rate channels are configured fixedly, or the channels whose rate can be dynamically adjusted,
the type of the channels is adjusted as "TCH Full Rate."
If a TRX is not configured with the half-rate channels, and if the TRX supports the half-rate service, the
TCH Rate Adjust Allow must be enabled.
A TRX channel is configured as "TCH Half Rate" to support the half-rate service. The detailed
procedures are as follows:
1. As shown in Figure 12-8, select a TRX to be adjusted in the Assigned TRXs area. Click
TRX Config. A dialog box is displayed, as shown in Figure 12-12.
Figure 12-12 Configure TRX Attributes dialog box
2. Select Channel Attributes tab. On the tab page, select the channel number to be adjustedin the Channel No.[0] area. In the Channel Type drop-down list box, select the channel
type to be set, as shown in Figure 12-13.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-18 Huawei Technologies Proprietary Issue 01 (2007-09-05)
http://-/?- -
7/30/2019 01 12 Half Rate Service
19/36
Figure 12-13 Configure TRX Attributes-TRX0 dialog box
3. Click OK. The configuration of the TRX parameters is complete.
Step 4 If a TRX does not have "TCH Half Rate" channels and only has "TCH Full Rate" channels, the
TCH Rate Adjust Allow needs to be enabled to enable the TRX to support the half-rate service.
NOTE
For a TRX whose TCH Rate Adjust Allow is not enabled, channels on the TRX are assigned preferably.
Therefore, the channels on the TRXs that support the rate adjustment can be reserved for further use. The
resources can be used maximally.
1. As shown in Figure 12-8, in the Assigned TRXs area, select a TRX to be adjusted. Click
TRX Config. A dialog box is displayed, as shown in Figure 12-12.
2. On the Device Attributes tab page, set the value of the TCH Rate Adjust Allow to Yes,
as shown in Figure 12-14.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-19
http://-/?-http://-/?-http://-/?-http://-/?-http://-/?- -
7/30/2019 01 12 Half Rate Service
20/36
Figure 12-14 Device attributes
3. Click OK. The configuration of the TRX parameters is complete.
----End
12.5.2 Verifying Half-Rate Service
Based on different channels configured on TRXs, the verification methods are different.
Procedure
Step 1 The TRX is configured with a "TCH Half Rate" channel.
1. On the BSC6000 Local Maintenance Terminal, right-click a TRX on the Management
Tree tab page. Choose Monitor Channel Status from the shortcut menu. A dialog box is
displayed, as shown in Figure 12-15.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-20 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
21/36
Figure 12-15 Monitor Channel Status(1) dialog box
2. Click Start. If a channel shown in Figure 12-16 is found, the TRX supports the half-rate
service.
Figure 12-16 Half-rate channel status
Step 2 The TRX is configured with only "TCH Half Rate" channels.
1. Use an MS that supports the half-rate service to lock the frequencies in a cell where a TRX
is located.
2. On the BSC6000 Local Maintenance Terminal, right-click a TRX on the Management
Tree tab page. Choose Monitor Channel Status from the shortcut menu. A dialog box is
displayed, as shown in Figure 12-15.
3. Click Start and view the channel status.
4. On the BSC6000 Local Maintenance Terminal, right-click a cell where the TRX is
located on the Management Tree tab page. Then choose Modify Administrative State
from the shortcut menu. A dialog box is displayed, as shown in Figure 12-17.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-21
-
7/30/2019 01 12 Half Rate Service
22/36
Figure 12-17 Modifying management status
5. Block all the other TCHs in the cell where the TRX is located so that a new speech service
initiated by an MS in the cell can only use TCHs that is on the TRX.
6. As shown in Figure 12-18, clickChannel Management. A dialog box is displayed, as
shown in Figure 12-19.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-22 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
23/36
Figure 12-18 Set Cell Attributes dialog box
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-23
-
7/30/2019 01 12 Half Rate Service
24/36
Figure 12-19 Setting channel management parameters
7. Click Advanced. A dialog box is displayed, as shown in Figure 12-20.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-24 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
25/36
Figure 12-20 Set Channel Parameter[Cell:3002E] dialog box
8. Select the HWII Channel Assignment and Radio Channel Control tab. On the tab page,
set the value of the TCH Traffic Busy Threshold(%) to 0.
9. Click OK. The configuration of parameters is complete.
10. Initiate a new speech service in the cell.
11. View Figure 12-15 to check whether the latest occupied channel on the TRX is a half-rate
channel. If the channel is a half-rate channel, the TRX supports the half-rate service.
----End
12.5.3 Enabling the Function of Reserving Priority Resources
Enable the function of reserving priority resources through the BSC6000 Local Maintenance
Terminal.
Procedure
Step 1 Apply for and activate the license
1. To apply for the license for the half-rate service, in theBSC6000V900R001 ExceptionalCommercial License Application Template, you should fill in the number of the TRXs that
support half-rate service in a specified range in the corresponding row ofNumber of the
TRX supporting half-rate in the Resource control items column.
2. Enable the license on the BSC6000 Local Maintenance Terminal. For details, refer to
Activating License.
After the license is activated, the BSC supports the function of reserving priority resources.
However, the attributes of related objects and parameters need to be set through the BSC6000
Local Maintenance Terminal.
Step 2 On the BSC6000 Local Maintenance Terminal, right-click a cell on the Management Tree
tab page, and choose Configure Cell Attributes from the shortcut menu. A dialog box isdisplayed, as shown in Figure 12-21.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-25
http://-/?-http://-/?- -
7/30/2019 01 12 Half Rate Service
26/36
Figure 12-21 Configuring Cells Attributes dialog box (1)
Step 3 Double-click a corresponding cell in the Cell view area, and then add it to the list of the Selectedcells.
Step 4 ClickNext. A dialog box is displayed, as shown in Figure 12-22.
Figure 12-22 Configuring Cells Attributes dialog box (2)
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-26 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
27/36
Step 5 In the Cells to be set column, select a corresponding cell. Then clickSet Cell Properties. Adialog box is displayed, as shown in Figure 12-23.
Figure 12-23 Set Cell Attributes dialog box
Step 6 In the Advanced Attributes area, clickChannel Management. A dialog box is displayed, asshown in Figure 12-24.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-27
-
7/30/2019 01 12 Half Rate Service
28/36
Figure 12-24 Set Channel Parameter[Cell: 3002E] dialog box
Step 7 Set the value ofGrade Access Allow to Yes. Set the value ofHighest Priority to 1. Set thevalue ofReserved Channel Number to 3. ClickOK.
NOTE
The value of
Reserved Channel Type can be only TCH FULL RATE. This parameter does not need to be adjusted.
Step 8 ClickOK. The Configuring Cells Attributes dialog box is displayed.
Step 9 ClickFinish to complete enabling the function of reserving priority resources.
----End
12.5.4 Reconfiguring Half-Rate Parameters
Reconfigure the half-rate parameters through the BSC6000 Local Maintenance Terminal.
Context
The reconfiguration of the half-rate parameters mainly refers to the modification of the channel
management parameters in a cell.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-28 Huawei Technologies Proprietary Issue 01 (2007-09-05)
http://-/?-http://-/?-http://-/?-http://-/?- -
7/30/2019 01 12 Half Rate Service
29/36
Procedure
Step 1 As shown in Figure 12-25, a parameter reconfiguration is complete. ClickOK.
Figure 12-25 Set Channel Parameter[Cell:3002E] dialog box
NOTE
As shown in
Figure 12-25, the channel management parameters related to the half-rate service can be configured. Basicparameters consist ofGrade Access Allow, Highest Priority, Reserved Channel Number, and
Enhanced TCH Adjust Allowed. Advanced parameters consist ofTCH Traffic Busy Threshold(%)
.
Step 2 ClickOK. A dialog box is displayed, as shown in Figure 12-26.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-29
http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?- -
7/30/2019 01 12 Half Rate Service
30/36
Figure 12-26 Set Cell Attributes dialog box
Step 3 ClickOKto save the configuration of cell parameters. A previous dialog box is displayed, asshown in Figure 12-27.
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-30 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
31/36
Figure 12-27 Configuring Cells Attributes dialog box (2)
Step 4 ClickFinishto end the configuration.
----End
12.5.5 Disabling Half-Rate ServiceDisable the half-rate service through the BSC6000 Local Maintenance Terminal.
Context
If a site does not supply the half-rate service, a license that is applicable to the site and that does
not support the half-rate service can be reapplied. For the disabling of the license, refer to
Maintaining BSC License.
If you need only disable the half-rate service for a TRX, you need modify only the TRX attributes.
For detailed procedures, refer to the following:
Procedure
Step 1 On the BSC6000 Local Maintenance Terminal, right-click a TRX on the ManagementTree tab page. Choose Configure TRX Attributes from the shortcut menu. A dialog box is
displayed, as shown in Figure 12-28.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-31
http://-/?-http://-/?- -
7/30/2019 01 12 Half Rate Service
32/36
Figure 12-28 Configure TRX Attributes dialog box
Step 2 In the TRX view area, select a TRX whose attributes to be modified. Then, clickSet TRXAttributes. A dialog box is displayed, as shown in Figure 12-29.
Figure 12-29 Configuring TRX attributes
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-32 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
33/36
Step 3 ClickChannel Attributes tab. On the tab page, select a channel number that can enable theChannel Type to be TCH Half Rate from the Channel No.[0]. In the Channel Type drop-
down list box, choose TCH Full Rate, as shown in Figure 12-30.
Figure 12-30 Configure TRX Attributes-TRX0 dialog box
Step 4 On the Device Attributes tab page, set the value of the TCH Rate Adjust Allow to Yes orNo.
Step 5 ClickOK. A dialog box is displayed, as shown in Figure 12-28.
Step 6 ClickFinish to complete the modification of TRX attributes.
----End
12.6 Maintenance InformationMaintenance information on half-rate service consists of the performance counters related to the
half-rate service.
Alarms
None.
Counters
Table 12-3 describes the performance measurement counters involved in the half-rate service.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-33
http://-/?- -
7/30/2019 01 12 Half Rate Service
34/36
Table 12-3 Counters related to the half-rate service
Counter Description
H3023A: Failed Internal Intra-Cell Handovers
(Dynamic Conversion, TCHF-TCHH)
In an intra-cell handover procedure, when
an MS accesses to the target cell correctly,and when the BSC receives any reason
that causes a failed handover before the
handover complete timer expires,
statistics are performed for related
counters based on different channel types.
The channels can be TCHs. Channels can
be handed over from TCHFs to TCHHs
(TCHF-TCHH) or from TCHHs to
TCHFs (TCHH-TCHF).
H3023B: Failed Internal Intra-Cell Handovers
(Dynamic Conversion, TCHH-TCHF)
H3003A: Internal Intra-Cell Handover Requests
(Dynamic Conversion, TCHF-TCHH)
This counter indicates the times of the
intra-cell handover requests from TCHFsto TCHHs.
H3003B: Internal Intra-Cell Handover Requests
(Dynamic Conversion, TCHH-TCHF)
This counter indicates the times of the
intra-cell handover requests from TCHHs
to TCHFs.
H3013A: Internal Intra-Cell Handover
Commands (Dynamic Conversion, TCHF-
TCHH)
This counter indicates the statistics of
related counters based on handover types
and channel types when the BSC sends an
HO CMD message to an MS through the
source cell.H3013B: Internal Intra-Cell Handover
Commands (Dynamic Conversion, TCHH-
TCHF)
TH3003A: Success Rate of Internal Intra-Cell
Handover (Dynamic Conversion, TCHF-TCHH)
Success Rate of Internal Intra-Cell
Handover (Dynamic Conversion, TCHF-
TCHH) = [Successful Internal Intra-Cell
Handovers (Dynamic Conversion, TCHF-
TCHH)] + {100}/[Internal Intra-Cell
Handover Requests (Dynamic
Conversion, TCHF-TCHH)]
TH3003B: Success Rate of Internal Intra-Cell
Handover (Dynamic Conversion, TCHH-TCHF)
Success Rate of Internal Intra-Cell
Handover (Dynamic Conversion, TCHH-
TCHF) = [Successful Internal Intra-CellHandovers (Dynamic Conversion,
TCHH-TCHF)] + {100}/[Internal Intra-
Cell Handover Requests (Dynamic
Conversion, TCHH-TCHF)]
CH3033A: Successful Internal Intra-Cell
Handovers (Dynamic Conversion, TCHF-
TCHH)
Successful Internal Intra-Cell Handovers
(Dynamic Conversion, TCHF-TCHH) =
[Internal Intra-Cell Handover Requests
(Dynamic Conversion, TCHF-TCHH)] -
[Failed Internal Intra-Cell Handovers
(Dynamic Conversion, TCHF-TCHH)]
12 Half-Rate Service
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
12-34 Huawei Technologies Proprietary Issue 01 (2007-09-05)
-
7/30/2019 01 12 Half Rate Service
35/36
Counter Description
CH3033B: Successful Internal Intra-Cell
Handovers (Dynamic Conversion, TCHH-
TCHF)
Successful Internal Intra-Cell Handovers
(Dynamic Conversion, TCHH-TCHF) =
[Internal Intra-Cell Handover Requests
(Dynamic Conversion, TCHH-TCHF)] -
[ Failed Internal Intra-Cell Handovers
(Dynamic Conversion, TCHH-TCHF)]
12.7 References
None.
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description 12 Half-Rate Service
Issue 01 (2007-09-05) Huawei Technologies Proprietary 12-35
-
7/30/2019 01 12 Half Rate Service
36/36