Network planning optimization assessment assessment methods:
2 Network index assessment part:
2.1 Overall objective: After the official launch of the GSM network optimization planning service, the average performance of network quality should reach the following network performance indicators during the period until the end of this contract The average value of network element A is used as the final value of the average performance of network quality):
2.1.1 Handover success rate ≥94%;
2.1.2 Successful rate of call establishment ≥94%;
2.1.3 The call drop rate is ≤0.90% in urban areas and suburbs, and ≤1.20% in suburbs;
2.1.4 User complaint resolution rate (including proposing specific solutions) ≥97%;
2.1.5 When the GSM mobile is busy, the incoming call rate of users is ≥54%;
2.1.6 GSM mobile phone busy call rate of wireless system ≥88.75%;
2.1.7 The local connection duration within China Unicom's mobile network is ≤7.3 seconds, and this indicator is measured at any time on any day of the last week every month;
2.1.8 The correct rate of recording notification is ≥97%;
2.1.9 Wireless utilization rate ≥50% (at the same time satisfy the TCH blocking rate of each cell ≤8%, and the TCH congestion rate of each BSC ≤1.5%)
2.2 Final goal: After the GSM network optimization is completed, the following network performance indicators should be reached (average indicator during the week after the optimization is completed):
2.2.1 Handover success rate ≥95%;
2.2.2 Successful rate of call establishment ≥95%;
2.2.3 The call drop rate is ≤0.8% in urban areas and suburbs, and ≤1.1% in suburbs;
2.2.4 The incoming call connection rate of users when GSM mobile is busy is ≥55%;
2.2.5 GSM mobile phone busy call rate of wireless system ≥89.5%;
2.2.6 The local connection duration within China Unicom's mobile network is ≤6.8 seconds. This indicator is measured at any time on any day of the last week of each month;
2.2.7 The correct rate of recording notification is ≥98%;
2.2.8 Wireless utilization rate ≥ 55% (at the same time, the TCH blocking rate of each cell ≤ 8% and the TCH congestion rate of each BSC ≤ 1.5%).
2.3 Minimum limit: After the GSM network optimization planning service is officially launched (February 2002), to the end of this contract, the network quality performance of each BSC or MSC should reach the following indicators (take the weekly or Monthly indicator average A):
2.3.1 Handover success rate ≥93%;
2.3.2 Successful rate of call establishment ≥92%;
2.3.3 The call drop rate is ≤1.05% in urban areas and suburbs, and ≤1.35% in suburbs;
2.3.4 When the GSM mobile is busy, the incoming call rate of users is ≥52%;
2.3.5 GSM mobile phone busy call rate of wireless system ≥87.5%;
2.3.6 The local connection duration within China Unicom's mobile network is ≤7.8 seconds. This indicator is measured at any time on any day of the last week every month;
2.3.7 Wireless utilization rate ≥ 45% (at the same time meet the block rate of each cell ≤ 8%, BSC level congestion rate ≤ 1.5%)
2.3.8 The correct rate of recording notification is ≥95%;
2.3.9 After Party A implements in accordance with Party B ’s recommendations, Party A ’s GSM network inter-town highways must reach coverage levels above -90dbm: according to road test data collection, (greater than -90dBm total sampling times / total sampling times × 100 %)> 98%; solve the coverage problems of all three-star hotels, tourist places and large residential areas (this assessment will be evaluated before the end of the contract, and the remaining monthly assessments are for reference only).
2.4 Description of assessment indicators
2.4.1 Handover success rate: all BSCs are weighted according to the formula definition;
2.4.2 Call establishment success rate: all BSCs are weighted according to the formula definition;
2.4.3 Call drop rate: the arithmetic average of the values ​​of each BSC, calculated by suburban and suburban BSC;
2.4.4 GSM mobile busy user incoming call rate: all MSCs are weighted according to the formula;
2.4.5 GSM mobile phone busy call rate of wireless system: all MSCs are weighted by formula;
2.4.6 Local connection duration in China Unicom's mobile network: take measurements at any time on any day of the last week every month;
2.4.7 Wireless utilization rate: Take all BSC traffic and wireless capacity calculation of all BSCs. Suburban county road coverage base stations and indoor coverage microcells are not counted, and at the same time must meet the congestion rate ≥ 8% (weekly busy The average number of cells is less than 2%, and the BSC level congestion rate is ≤1.5% (average weekly busy hour); if the number of cells with a congestion rate of ≥8% is greater than 2%, the final value of wireless utilization is reduced by 3 every time it exceeds 1% %; Take the sum of the monthly traffic of each cell when the maximum traffic is busy (except for the busy hours of special holidays) and the calculation of wireless traffic capacity of the day), if Party B has proposed a specific plan to increase the utilization rate of a cell and is accepted by Party A, Then the community will not be included in the assessment scope of Article 2.3.8 of this annex before the implementation of the plan;
2.4.8 Correct rate of recording notification: take a measurement at any time on any day of the last week every month, and test the correctness of the recording notification for various situations (including user busy, user turned off, out of service range, etc.) The measurement method is that a fixed phone dials a mobile station within the coverage of an MSC, and a mobile station dials a mobile station within the coverage of an MSC;
2.4.9 If Party B has proposed a specific coverage plan accepted by Party A for a coverage problem area, the coverage problem of that area before the implementation of the program is not included in the assessment scope of Article 2.3.9 of this Annex.
3 Monthly evaluation and assessment part shall evaluate and evaluate Party B's work according to the following method every month, and implement a percentage system. The assessment is divided into two parts: optimization and planning, in which the optimization part has a total score of 100 points and the planning part has a total score of 20 points. Final total score = optimized part score X 80% + planning part score.
If the following situation occurs: the first month score is less than 50 points, or the second month score is less than 55 points, or the remaining monthly scores are less than 60 points, Party A will give Party B a warning; during the contract period: If there are more than two warning records, Party A can cancel the contract between the two parties according to the actual situation. Party A only pays Party B the network planning optimization fee before the month, and deducts 15% of the paid fee as a fine. If the score is above 85 points, Party A will give Party B a compliment once; if there are two praise records during the contract period, Party A will give Party B a reward of 10% of the network planning optimization fee.
3.1 Optimization section (100 points)
3.1.1 Actual measurement results (45 points)
The test tool uses TEMS, Wanhe or Dingli road test equipment:
3.1.1.1 DT part (20 points)
(1) Connectivity rate (5 points)
Connectivity rate = total number of connection times / total number of call attempts × 100%
99% (5 points)
Greater than or equal to 97% (4 points)
Greater than or equal to 95% (3 points)
Greater than or equal to 93% (2 points)
Greater than or equal to 90% (1 point)
Call connection means: start the trial call (setup) until the other party answers (Connect);
(2) Call drop rate (5 points)
Call drop rate = total number of dropped calls / total number of connected calls × 100%
It should be pointed out here: the dropped calls measured by the test instrument here include the dropped calls of the signaling channel and the dropped voice channel.
0.5% (5 points)
Less than or equal to 0.8% (4 points)
Less than or equal to 1% (3 points)
Less than or equal to 1.5% (2 points)
Less than or equal to 2% (1 point)
For each dropped call on the defined main road, 1 point will be deducted from this assessment item; if the dropped call is caused by the interruption of the base station of Party A or the discovered equipment failure, it will not be included in the scope of this assessment; if Party B has proposed For the specific solution accepted by Party A, the dropped calls of this section before the implementation of the plan will not be included in the scope of this assessment;
(3) Coverage rate (5 points)
Coverage> = ― 90dBm total times / total sampling times × 100 ％
Greater than or equal to 99% (5 points)
Greater than or equal to 98% (4 points)
Greater than or equal to 96% (3 points)
Greater than or equal to 95% (2 points)
Greater than or equal to 94% (1 point)
Less than 94% (0 points)
If Party B has proposed a specific coverage plan accepted by Party A for a coverage problem area, the coverage problem in that area will not be included in the scope of this assessment before the program is implemented;
(4) Voice quality (5 points)
List the percentages of voice quality from 0-7 level, take the unbalanced weighted percentage = [voice quality (level 0) + voice quality (level 1) + voice quality (level 2)] × 1 + [voice quality (level 3 ) + Voice quality (level 4)] × 0.8 + [voice quality (level 5) + voice quality (level 6)] × 0.5 + voice quality (level 7) × 0.2
Greater than or equal to 98.5% (5 points)
Greater than or equal to 97.5% (4 points)
Greater than or equal to 96% (3 points)
Greater than or equal to 95% (2 points)
Greater than or equal to 94% (1 point);
3.1.1.2 CQT test part (15 points)
(1) Connectivity rate (5 points)
Connectivity rate = total number of connection times / total number of call attempts × 100%
99% (5 points)
Greater than or equal to 98% (4 points)
Greater than or equal to 96% (3 points)
Greater than or equal to 94% (2 points)
Greater than or equal to 92% (1 point)
Call connection means: start the trial call (setup) until the other party answers (Connect);
(2) Call drop rate (5 points)
Call drop rate = total number of dropped calls / total number of connected calls × 100%
It should be pointed out here: the dropped call measured by the test instrument here includes the dropped call of the signaling channel and the dropped call of the voice channel.
0 (5 points)
Less than or equal to 0.5% (4 points)
Less than or equal to 1% (3 points)
Less than or equal to 1.5% (2 points)
Less than or equal to 2% (1 point);
(3) User perception (5 points)
[1- (Number of occurrences of crosstalk, one-way conversation, discontinuity of voice, echo, background noise, and recording notification errors / total number of connections)] × 100%
99.5% (5 points)
Greater than or equal to 99% (4 points)
Greater than or equal to 98% (3 points)
Greater than or equal to 97% (2 points)
Greater than or equal to 95% (1 point)
If one or more of the above phenomena occur at the same time in a call, only the voice quality problem is calculated once; if the drop-out phenomenon occurs at the same time, only the dropped call is counted, and the voice quality problem is not counted.
3.1.1.3 The accuracy rate of recording notification (5 points)
Recording notification accuracy rate = (1-number of recording notification errors / total number of calls) X 100%
98% (5 points)
Greater than or equal to 97% (4 points)
Greater than or equal to 96% (3 points)
Greater than or equal to 95% (2 points)
Less than 95% (0 points)
At the end of each month, dialing tests for the correctness of recording notifications under various situations (including user busy, user turned off, out of service range, etc.) are performed, including the situation of fixed-line phone calls and mobile phone calls.
3.1.1.4 Length of local connection in China Unicom mobile network (5 points)
Local connection duration in China Unicom mobile network = the moment when the user receives the ringback tone-the moment when the user initiates the call. This indicator is measured at any time on any day of the last week every month. Duration ≤6.8 seconds (5 minutes)
6.8 seconds <duration ≤ 7 seconds (4 minutes)
7 seconds <duration ≤ 7.3 seconds (3 minutes)
7.3 seconds <duration ≤ 7.5 seconds (2 minutes)
7.5 seconds <duration ≤7.8 seconds (1 minute)
Duration <8 seconds (0 minutes).
3.1.2 Evaluation of network monitors (15 points)
The designated personnel feel the network quality and the degree of change from the perspective of ordinary users using the network. The network monitors can be employees of Unicom, employees of Sijiao County and other related companies or ordinary users (20 points).
(1) Network quality performance (7 points)
Very good network quality: 7 points Good network quality: 5 points Average network quality 3 points Poor network quality: 0 points Poor network quality: -5 points
(2) Network improvement performance (8 points)
The network quality is obviously improved: 8 points The network quality is partially improved: 6 points The network quality is not improved: 3 points The network quality is deteriorated: 0 points The network quality is obviously bad: -5 points
The evaluation of the monitor will be conducted from the end of each month. If the score is below 0 points (including 0 points), Party A will give Party B a warning; if the score is below 0 points (including 0 points) for two consecutive times, Party A may release both parties according to the actual situation In the contract, Party A only pays Party B the network planning optimization fee before the month, and deducts 15% of the paid fee as a fine.
3.1.3 Optimization log (5 points)
Submit weekly report, monthly report, work plan, work summary, special report, revision record, reply to work order, etc. on time. (5 points).
Submit all kinds of reports and records on time (5 points)
Basically submit various reports and records on time (3 points)
Not submit all kinds of reports and records on time (0 points).
3.1.4 User complaint resolution (5 points)
User complaint resolution rate = (number of complaints handled and responded to by Party A within two days / number of user complaints in various channels) × [number of resolved user complaints (including the proposal of specific planning and transformation plans) / user complaints in various channels Number] × 100%
100% (5 points)
Greater than or equal to 98% (4 points)
Greater than or equal to 95% (2 points)
Less than or equal to 95% (0 points).
3.1.5 OMC statistical indicators (30 points)
Take OMC statistical data, and calculate according to the provisions of Article 2.4 of this Annex and the definition of Article 4 statistical formula.
(1) Call drop rate (5 points)
City:
Less than or equal to 0.8% (5 points)
Less than or equal to 0.9% (4 points)
Less than or equal to 1.0% (3 points)
Less than or equal to 1.1% (2 points)
Less than or equal to 1.2% (1 point)
suburbs:
Less than or equal to 1.10% (5 points)
Less than or equal to 1.20% (4 points)
Less than or equal to 1.30% (3 points)
Less than or equal to 1.35% (2 points)
Less than or equal to 1.40% (1 point)
(2) Handover success rate (5 points)
Greater than or equal to 95.0% (5 points)
Greater than or equal to 94.0% (4 points)
Greater than or equal to 93.0% (3 points)
Greater than or equal to 92.5% (2 points)
Less than 92.5% (0 points)
(3) Call establishment success rate (5 points)
Greater than or equal to 95.0% (5 points)
Greater than or equal to 94.0% (4 points)
Greater than or equal to 93.0% (3 points)
Greater than or equal to 92.0% (2 points)
Greater than or equal to 91.0% (1 point)
(4) User call incoming rate when GSM mobile is busy (5 points)
Greater than or equal to 55.0% (5 points)
Greater than or equal to 54.0% (4 points)
Greater than or equal to 53.0% (3 points)
Greater than or equal to 52.5% (2 points)
Greater than or equal to 51.0% (1 point)
(5) GSM mobile phone busy call rate in wireless system (5 points)
Greater than or equal to 89.5% (5 points)
89.0% or more (4 points)
Greater than or equal to 88.5% (3 points)
88.0% or more (2 points)
Greater than or equal to 87.5% (1 point)
(6) Wireless utilization rate (5 points)
Greater than or equal to 55% (5 points)
50% or more (4 points)
Greater than or equal to 47% (3 points)
Greater than or equal to 45% (2 points)
42% or more (1 point)
This indicator must also meet the conditions of TCH blocking rate of each cell ≤8% and BSC level TCH congestion rate ≤1.5% (average weekly indicators).
The number of cells with a TCH blocking rate of less than 8% / the total number of cells ≥ 2%, and every time it exceeds 1%, the final value of wireless utilization is reduced by 3%.
Suburban county road coverage base stations and indoor coverage microcells are not included in this assessment index.
3.2 Network planning optimization suggestions (20 points)
Each time Party B proposes a specific macrocell planning or transformation plan and is accepted and implemented by Party A, the total score increases by 1 point. Party B proposes an optimization proposal that Party A recognizes as a major contribution to the network, and the total score increases by 2 points. The total score for this article does not exceed 20 points.
4 Definition of indicator formula
4.1 DROP_CALL_RATE A1:
Cell level:
Drop_call_rate (%) =%
Where: inter_bss_ho_lostms = out_inter_bss_ho [out_inter_bss_ho_atmpt]
out_inter_bss_ho [out_inter_bss_ho_suc]-
out_inter_bss_ho [out_inter_bss_ho_return]
BSS level:
Drop_call_rate (%) =%
Where: inter_bss_ho_lostms = out_inter_bss_ho [out_inter_bss_ho_atmpt]
out_inter_bss_ho [out_inter_bss_ho_suc]-
out_inter_bss_ho [out_inter_bss_ho_return]
Network level:
Drop_call_rate (%) =%
Among them: inter_bss_ho_lostms = out_inter_bss_ho [out_inter_bss_ho_atmpt]-
out_inter_bss_ho [out_inter_bss_ho_suc]-
out_inter_bss_ho [out_inter_bss_ho_return]
4.2 Call establishment success rate A2:
call_setup_success_rate (%) =
4.3 TCH blocking rate A3:
tch_congesTIon_key (%) =
4.4 SDCCH blocking rate A4:
sdcch_congesTIon_key (%) =
4.5 Switching success rate A5:
handover_success_rate (%) =
4.6 Outgoing call connection rate to China Telecom local network A6
This indicator reflects the connectivity of Unicom mobile network users dialing China Telecom's local network. The statistical reference point is the interconnection point (or interface bureau). Multiple interconnection points (or interface offices) take the weighted average value.
A6 = Total number of user responses M1 / ​​Total number of trials N1 * 100%
M1: Refers to the total number of off-hook response times for local users of China Telecom.
N1: Refers to the total number of times that China Unicom mobile network users call China Telecom local network users to occupy trunk groups between China Unicom switches and telecom switches.
4.7 Call Connectivity Between Networks A7
This indicator reflects the connection status of other telecom network users dialing the Unicom mobile network. The statistical reference point is the interconnection point (or interface bureau). Multiple interconnection points (or interface offices) take the weighted average value.
A7 = Total number of user responses M2 / Total number of trials N2 * 100%
M2: Refers to the total number of times that Unicom mobile network users pick up the phone and answer.
N2: refers to the total number of times that users of other telecommunications networks (China Telecom, China Mobile) call Unicom mobile network users occupy trunk lines between Unicom switches and other telecommunications network switches.
4.8 Outgoing call connection rate to China Mobile A8
This indicator reflects the connectivity of Unicom mobile network users dialing China Mobile's network, and the statistical reference point is the interconnection point (or interface bureau). Multiple interconnection points (or interface offices) take the weighted average value.
A8 = Total number of user responses M3 / Total number of trials N3 * 100%
M3: Refers to the total number of times that China Mobile network users pick up the phone and answer.
N3: Refers to the total number of times that China Unicom mobile network users call China Mobile network users to occupy trunk groups between China Unicom switches and China Mobile network switches.
4.9 Outgoing call connection rate to China Telecom fixed network remote locations (including international) A9
This indicator reflects the connectivity of Unicom mobile network users dialing out of China Telecom fixed network users, and the statistical reference point is the interconnection point (or interface bureau). Multiple interconnection points (or interface offices) take the weighted average value.
A9 = total number of user responses M4 / total number of trials N4 * 100%
M4: Refers to the total number of off-hook answers of users of China Telecom's fixed network in different places (including international).
N4: Refers to the total number of times that China Unicom mobile network users call remote China Telecom fixed network users to occupy trunk groups between China Unicom switches and China Telecom switches.
4.10 Connectivity rate of local outgoing calls in China Unicom mobile network A10
This indicator reflects the local telephone connection of China Unicom's mobile network. The statistical reference points are the local end office MSC and the provincial transit office TMSC. Multiple end office MSCs and tandem office TMSCs take values ​​according to the weighted average.
A10 = total number of user responses M5 / total number of trials N5 * 100%
M5: Refers to the total number of off-hook responses of local users of China Unicom mobile network.
N5: refers to the total number of calls between local users of China Unicom mobile network occupying the trunk group between the local end office MSC and BSC + the total number of calls of remote Unicom users calling the local Unicom user occupying the trunk group between TMSC and the local end office MSC
4.11 Long-distance outgoing call connection rate in China Unicom mobile network A11
This indicator reflects the connection status of local users of China Unicom mobile network dialing out-of-network calls, and the statistical reference point is TMSC of the Provincial Remittance Bureau. The TMSC of multiple gateways takes the minimum value.
A11 = Total number of user responses M6 / Total number of trials N6 * 100%
M6: Refers to the total number of off-hook responses of users in China Unicom mobile network.
N6: refers to the total number of times that a local user of China Unicom mobile network calls a remote China Unicom user to occupy a trunk group between the local end office MSC and the provincial transit office TMSC.
4.12 GSM mobile phone busy call rate of wireless system A12
This indicator reflects the coverage of China Unicom's mobile network wireless system, and the statistical reference point is the exchange MSC. Multiple MSCs take values ​​according to the weighted average.
A12 = Total number of wireless system responses when the GSM mobile phone is busy M7 / Total number of base station paging N7 * 100%
M7: Refers to the total number of times the exchange receives the response from the mobile terminal.
N7: The total number of times the MSC initiated paging.
4.13 Unicom mobile network wireless system call drop rate A13
This indicator reflects the call quality of China Unicom's mobile network wireless system. The statistical reference points are the base station controller BSC and the exchange MSC. Multiple BSCs and MSCs take values ​​according to the weighted average.
A13 = Total number of dropped calls M8 / Total number of TCH channels allocated by the system N8 * 100%
M8: refers to the total number of dropped calls due to radio frequency fading (RF LOSS) and various handover failures (intra / interBSC, interMSC).
N8: refers to the total number of times the system has allocated TCH channels for the called user.
4.14 Unicom mobile network sector traffic overflow ratio A14
This indicator reflects the wireless system load of China Unicom mobile network. The statistical reference point is the base station controller BSC. Multiple BSCs take values ​​according to the weighted average.
A14 = Number of sectors with traffic overflow M9 / Number of all sectors N9 * 100%
M9: refers to the sum of the total number of sectors with SDCCH channel blocking rate G1 greater than 2% or TCH channel blocking rate G2 greater than 5%.
G1 = Number of failures to occupy the SDCCH channel / Number of requests to allocate the SDCCH channel * 100%
G2 = Number of failures to occupy the TCH channel / Number of requests to allocate the TCH channel * 100%
N9: refers to the sum of all sectors in the area.
4.15 Unicom Mobile Network Switch Online User Occupancy Ratio A15
This indicator reflects the busy hour load situation of the China Unicom mobile network switch VLR, and the statistical reference point is the visited location register VLR. Multiple VLRs take the weighted average value.
A15 = Online users M10 / Visitor location register VLR capacity number N10 * 100%
M10: Refers to the number of users who have registered online in the VLR.
4.16 to China Telecom local network connection duration A16
This indicator reflects the length of time for Unicom mobile users to connect to China Telecom local network users. The statistical reference point is the mobile station.
A16 = Time when user receives ringback tone M11-Time when user initiates call N11.
4.17 To China Telecom fixed network remote connection duration A17
This indicator reflects the length of time for Unicom mobile users to call China Telecom's fixed network remote users. The statistical reference point is the mobile station.
A17 = Time when user receives ringback tone M12-Time when user initiates call N12.
4.18 to China Mobile network connection duration A18
This indicator reflects the length of time for Unicom mobile users to call China Mobile users, and the statistical reference point is the mobile station.
A18 = Time when user receives ringback tone M12-Time when user initiates call N12.
4.19 Local connection duration in China Unicom mobile network A19
This indicator reflects the duration of Unicom mobile users calling local users in the network, and the statistical reference point is the mobile station.
A19 = Time when user receives ringback tone M14-Time when user initiates call N14.
4.20 A20 connection time in Unicom mobile network
This indicator reflects the length of time for Unicom mobile users to call users in different places in the network. The statistical reference point is the mobile station.
A20 = Time when the user receives the ringback tone M15-Time when the user initiates the call N15.
4.21 User incoming rate A21 when GSM mobile is busy
This indicator reflects the connection status of the Unicom mobile network phone called, and the statistical reference point is the exchange MSC.
A21 = Number of replies (times) for incoming calls when the GSM mobile is busy / Number of calls (times) for incoming calls when the GSM mobile is busy, multiple MSCs take the weighted average.
4.22 Correct rate of recording notification A22
This indicator reflects the correctness of the recording notification broadcast of the Unicom mobile network system, and the statistical reference point is the mobile station.
A22 = (1 – Number of recorded notification errors / total number of calls) X 100%.
4.23 Wireless utilization rate A23
A23 = Total wireless traffic / total wireless capacity of the system The wireless capacity of the system is calculated based on 2% of call loss and Irish table B.
5 Description of actual test
5.1 DT part (1) The test time is scheduled to be conducted during the busy hours of the network (9: 00-12: 00 in the morning, 1: 00-6: 00 in the afternoon);
(2) The speed of the vehicle should not exceed 50 kilometers during the road test in the urban area. The speed should not exceed 70 kilometers during the road test in the suburbs. The speed should not exceed 100 kilometers during the road test on the highway.
(3) The continuous dialing method is used for testing. The call duration is about 100 seconds, and the call interval is less than 5 seconds.
5.2 CQT test part (1) The test time is selected from 9:00 to 18:00, or according to the busy time of the cell;
(2) Test locations are tourist attractions, airports, long-distance passenger stations of railway stations, passenger terminal transportation hubs, hotels, high-rise office buildings, dining and entertainment venues, large shopping malls, residential areas, etc .;
(3) The number of measurement points is more than 30;
(4) The test consists of two groups of testers. When one group reaches the test point, it notifies the other group to start the test;
(5) The on-site team member will issue 10 fixed calls to the other team member, each time lasting 1 minute, and each time interval is 0.5 minutes;
(6) Then contact another team member to make 5 fixed-to-mobile calls, each time lasting 1 minute, and each time interval is 0.5 minutes;
(7) For a multi-storey building, the call is made 5 times on the lower floor, 10 times on the middle floor and 5 times on the upper floor.
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