CN1805584A - Test call method for cluster system - Google Patents

Abstract

The present invention provides a test calling method of a CDMA-based trunking system, comprising the following steps: Step 1: Add a push-to-talk server on the network side, and initiate a trunking test call on the mobile terminal or the network side; Step 2: After the trunking call is established, The mobile terminal competes for the right to speak; Step 3: the mobile terminal that has applied for the right to speak starts to generate a data frame; Step 4: the data frame is transmitted by the processing mode of the voice frame, and the remaining mobile terminals receive the data frame and perform statistics, And report the statistical result to the push-to-talk server; Step 5: After a certain period of time, the mobile terminal with the original speaking right releases the speaking right, triggering a new round of talking right competition. The invention can simulate the mobile terminal to apply for the right to speak, and send voice frames to the mobile terminals in other groups, and the receiving party can calculate the frame error rate, time delay and other indicators for measuring the network quality and carrying out the capacity test.

Description

A kind of call testing method of group system

Technical field

The present invention relates to a kind of call testing method of communication system, relate in particular to a kind of call testing method of group system, can be used in the cdma system.

Background technology

Defined a kind of test call in the CDMA2000 agreement: markov (Markov) test call can generate speech frame by BSC and mobile phone difference anthropomorphic dummy's " voice ".The recipient can predict the content of the speech frame that is about to receive, then with actual reception to speech frame compare, thereby count frame error rate in a period of time.Markov test is called out and can be replaced true man to carry out " speech ", is widely used in the volume test and the coverage test of cdma network.

Group service (PTT) can provide the half-duplex voice of point-to-multipoint to call out.In group system, the characteristics according to its " people speech, many people listen to " by aerial mouthful the channel management and the modification of power control pattern, can largely increase the capacity of air interface.The traffic model of the traffic model of group system and CDMA20001x speech business has very big difference, be mainly reflected in synchronization, a user can only be arranged in speech in the group, all the other users can only listen to, the user who is promptly talking has only reverse speech frame and does not have the forward direction speech frame, and the user who is listening to has only the forward direction speech frame and do not have reverse speech frame on the contrary.So if carry out the test of cluster network capacity, Markov test is called out inapplicable, and existing technology can't simulate the peculiar traffic model of trunked call, can only adopt real method of testing, be that the artificially operating handset carries out " speech ", cost is huge.

Summary of the invention

Technical problem to be solved by this invention provides a kind of call testing method of group system, can simulating mobile terminal application right of speech, and in other group terminal transmission speech frame, the recipient can count indexs such as frame error rate, voice delay time, be used to weigh network quality, carry out volume test.

In order to solve the problems of the technologies described above, the present invention has adopted following technical proposals:

A kind of call testing method of group system is provided, comprises the steps:

Step 1: increase the PTT service device at network side, portable terminal or network side are initiated the cluster test call;

Step 2: trunked call is competed right of speech after setting up and finishing between portable terminal;

Step 3, apply for that the portable terminal (to call transmit leg in the following text) of right of speech begins to generate Frame;

The processing mode that step 4, described Frame are pressed speech frame transmits, and all the other portable terminals (to call the recipient in the following text) receive described Frame and add up, and to PTT service device report statistics;

The portable terminal of original right of speech discharges right of speech behind step 5, the certain hour, triggers the right of speech competition of a new round.

Further, described Frame is to generate the GPS absolute time when being filled with assembled data frame in the described Frame according to the model of typical voice call is dynamic.

The described step that after step 2, also comprises:

If a certain portable terminal in the right to apply for words process, is received the right of speech notification message that the PTT service device sends, represent that other portable terminal applied for right of speech, this terminating mobile terminal the right to apply for words then, the log-on data frame receives and the statistics flow process.

Described Frame can be a kind of in following four kinds: full-rate vocoding, 1/2 rate frame, 1/4 rate frame, 1/8 rate frame.

Described GPS absolute time information can be repeated to send repeatedly in same Frame.

The described Frame of the portable terminal transmission of right of speech of applying for intactly is sent to all the other portable terminals.

The described initiation this time portable terminal or the PTT service device of test call can stop working as Pretesting, and other portable terminal can only withdraw from test and can not stop test.

Described PTT service device shows statistics.

Described trunked call can be individual calling or group calling.

The present invention's energy simulating mobile terminal application right of speech, and portable terminal sends speech frame in other group, the recipient can count indexs such as frame error rate, time delay, is used to weigh network quality, carries out volume test.

Description of drawings

Fig. 1 is a group system network structure of the present invention.

Fig. 2 is the cluster test call flow chart that portable terminal is initiated.

The cluster test call flow chart that network side is initiated among Fig. 3.

Fig. 4 is the right to apply for words flow graph.

Fig. 5 is that right of speech discharges flow chart.

Fig. 6 is statistics querying flow figure.

Embodiment

As shown in Figure 1: group system network of the present invention has increased new network element PTT Server (PTT service device) with respect to the networking of CDMA 1X, is responsible for management and group, location management and the voice calls exchange of cluster user.In this programme, PTT Server also will be responsible for initiating the cluster test call as the triggering person of test call.

Based on above-mentioned group system network, call testing method of the present invention comprises the steps:

Step 1: increase the PTT service device at network side, portable terminal or network side are initiated the cluster test call;

Step 2: trunked call is competed right of speech after setting up and finishing between portable terminal;

Step 3, apply for that the portable terminal of right of speech begins to generate Frame, described Frame is to send the cluster portable terminal of data by using pseudo-random process, dynamically generate the GPS absolute time when being filled with assembled data frame in the described Frame according to the model of typical voice call;

The processing mode that step 4, described Frame are pressed speech frame transmits, and all the other portable terminals receive described Frame and add up, and to PTT service device (PTT Server) report statistics;

The portable terminal of original right of speech discharges right of speech behind step 5, the certain hour, triggers the right of speech competition of a new round.

Further, as shown in Figure 2, in the step 1, the flow process that portable terminal is initiated the cluster test call comprises the steps:

A, cluster portable terminal signalling of bouquet are called out initial call message, and the cluster test call is carried out in request, and the business option that carries in the message is " cluster test call-individual calling " or " cluster test call-group calling ";

B, PTT Server are according to the called number in the portable terminal initial call message, to other portable terminal signalling of bouquet call page message that belongs to this group, the business option that carries in the message is " cluster test call-individual calling " or " cluster test call-group calling ";

Connect between c, PTT Server and the calling mobile terminal, be used for transmit data frames.Whenever step c can take place after step a;

After other portable terminal in d, the group received the trunked call beep-page message, the signalling of bouquet call page responded, and connected with PTTServer.If PTT Server still has subscriber paging not have response after waiting for certain hour in the group, then PTT Server directly forwards step e to, only sends the right of speech idle message to the portable terminal that has inserted;

After e, all users inserted, PTT Server sent the right of speech idle message to all portable terminals that inserted, represented that present right of speech, can be for application for idle;

As shown in Figure 3: the flow process of network side initiation cluster test call comprises the steps: in the step 1

A, operator operate on PTT Server, by the cluster test call of group's group number triggering to this group, PTT Server all portable terminal signalling of bouquet call page message in group, the business option that carries in the message is " cluster test call-individual calling " or " cluster test call-group calling "

After b, each portable terminal received the trunked call beep-page message, the response of signalling of bouquet call page connected with PTT Server.If PTT Server still has subscriber paging not have response after waiting for certain hour in the group, then PTT Server directly forwards step c to, only sends the right of speech idle message to the portable terminal that has inserted

After c, all users inserted, PTT Server sent the right of speech idle message to all portable terminals that inserted, represented that present right of speech, can be for application for idle;

Described application process is as follows: when right of speech is idle, PTT Server notifies each portable terminal by the right of speech idle message, after portable terminal receives this message, and the initializing pseudo random factor, carry out right of speech and rob power, (specifically, get the number between 0 to 255 at random, if less than 50, then apply for right of speech, the probability of application right of speech is 50/255 like this, general 20%), flow process is as follows:

{

a＝7 ⁵＝16807

m＝2 ³¹-1＝2147483647

The RNG=Current GPS time (is unit with the frame)

RNG＝(RNG＾ESN)&0x7FFFFFFF

RNG＝(RNG*a)mod m

RNG＝(RNG*a)mod m

RNG＝(RNG*a)mod m

RNG＝(RNG*a)mod m

yn＝(RNG＞＞7)&0xFF

if(yn≤50)

Application sending the right words message

endif

}

In the above algorithm, ESN (Electronic Serial Number) is the Electronic Serial Number of portable terminal.

If the condition of application sending the right words message does not satisfy, perhaps PTT Server refuses the application of this right of speech, and portable terminal is (500ms is to the random value between the 1000ms) at set intervals, once adjudicates again, and decision method is as follows:

{

a＝7 ⁵＝16807

m＝2 ³¹-1＝2147483647

RNG＝(RNG*a)mod m

yn＝(RNG＞＞7)&0xFF

if(yn≤50)

Application sending the right words message

endif

}

After the application sending the right words message, if portable terminal receives the right of speech grant message that PTT Server sends, then portable terminal log-on data frame generates and transmission flow.

If in the right to apply for words process, portable terminal receives the right of speech notification message that PTT Server sends, and represents that other portable terminal applied for right of speech, then terminating mobile terminal the right to apply for words judgement, and the log-on data frame receives and the statistics flow process.

The portable terminal application is after right of speech, and the longest air time is 1 minute, and after promptly the longest 3000 frames, portable terminal sends the right of speech release message, discharges right of speech.

As shown in Figure 4: the flow process of portable terminal competition right of speech comprises the steps: in the step 2

Under a, the connected state, portable terminal is to PTT Server application sending the right words message

If the current right of speech free time of b, PTT Server sends the right of speech grant message to this portable terminal, and this moment, this mobile terminal backward passage was opened, and can upwards send Frame, otherwise PTT Server sends the right of speech refuse information to this portable terminal;

Other has inserted portable terminal transmission right of speech notification message in group for c, PTT Server, notifies its terminal iidentification of having applied for right of speech at present, receive the right of speech notification message after, portable terminal begins receiving data frames and adds up.

As shown in Figure 5, the flow process of portable terminal release right of speech comprises the steps: in the step 5

Under a, the connected state, the portable terminal that has right of speech sends the right of speech release message to PTT Server;

B, PTT Server regain right of speech, and all have inserted portable terminal and have sent the right of speech idle message in group; If desired, PTTServer can initiatively send the right of speech idle message, reclaims right of speech, does not need message a in this case;

C, portable terminal send the test result report message to PTT Server, report that this takes turns the statistics of test.

Further, the feature of Frame is as follows in the described step 3:

1, Multiplex Option

The cluster test call is supported Multiplex Option MO (Multiplex Options) 0x01 and 0x02, the every 20ms of portable terminal generates a frame data frame, the Frame that generates can be a kind of in full rate, 1/2 speed, 1/4 speed, 1/8 speed, and the bit number that every kind of Frame comprised is as shown in the table:

Data frame type	MO＝1	MO＝2
			Full rate	171	266
1/2 speed	80	124
			1/4 speed	40	54

1/8 speed

16

20

2, Frame is filled

In the cluster test call, the portable terminal transmit leg uses gps time to come the padding data frame, and gps time is be the Current GPS absolute time of unit with millisecond (ms), and the gps time significance bit is long, so only get low 16 or low 24 information as fillings.For the foundation that judges whether the mistake frame is provided to the recipient, gps time is repeated to send twice at least in same frame, according to different speed, and the filling mode of Frame such as following table.

Multiplex Option is 0x01, the filling mode of Frame:

Data frame type	Information bit length	Gps time length	The gps time number of repetition	Filling bit length	The filling bit content
						Full rate	171	24	7	3	‘101’B
1/2 speed	80	24	3	8	0xAB
						1/4 speed	40	16	2	8	0xAB
1/8 speed	16	0	0	16	0xABAB

Multiplex Option is 0x02, the filling mode of Frame:

Data frame type	Information bit length	Gps time length	The gps time number of repetition	Filling bit length	The filling bit content
						Full rate	266	24	11	2	‘10’B
1/2 speed	124	24	5	4	‘1010’B
						1/4 speed	54	16	3	6	‘101010’B
1/8 speed	20	0	0	20	0xABABA

If when sending Frame, in a certain 20ms moment, portable terminal upper-layer protocol stack requires to send other layer 3 signalings, and then portable terminal stops the transmission of epicycle Frame.

3, speed decision

In the cluster test call, the portable terminal transmit leg uses pseudo random sequence to decide the type of Frame, promptly adopts full rate, 1/2 speed, 1/4 speed or 1/8 speed to send Frame.

According to the speed R (n-1) of portable terminal present rate R (n) and last data frame, portable terminal can be divided into 16 states as shown in the table.Each state can only be moved in certain one of four states, as, state 0 can only be moved to state 0,1, and 2 and 3, state 1 can only be moved to state 4,5, and 6 and 7.If the state S (n-1) of n-1 Frame is k, the state S (n) of n Frame satisfies following formula so:

S(n)∈{(4×k)mod 16，(4×k+1)mod 16，(4×k+2)mod 16，(4×k+3)mod 16}

If state S (n) determines that rate corresponding is so:

$R\left(n\right)=\frac{1}{2^{\left(S\left(n\right)\mathrm{mod}4\right)}}$

S(n)	R(n-1)	R(n)
			0	1	1
1	1	1/2
			2	1	1/4
3	1	1/8
			4	1/2	1
5	1/2	1/2
			6	1/2	1/4
7	1/2	1/8
			8	1/4	1
9	1/4	1/2
			10	1/4	1/4
11	1/4	1/8
			12	1/8	1
13	1/8	1/2
			14	1/8	1/4
15	1/8	1/8

After portable terminal receives the right of speech grant message, the initializing pseudo random factor (RND, Random Number Generator), method is as follows:

{

a＝7 ⁵＝16807

m＝2 ³¹-1＝2147483647

The RNG=Current GPS time (is unit with the frame)

RNG＝(RNG＾0x2AAAAAAA)&0x7FFFFFFF

RNG＝(RNG*a)mod m

RNG＝(RNG*a)mod m

RNG＝(RNG*a)mod m

RNG＝(RNG*a)mod m

S(0)＝15

}

The every 20ms of portable terminal uses current RNG afterwards, once calculate by following method, and decision speed, and the padding data frame sends.

{

a＝7 ⁵＝16807

m＝2 ³¹-1＝2147483647

RNG＝(RNG*a)mod m

zn＝(RNG＞＞7)&0x7FFF

if(zn＜A1)

S(n)＝(4*s(n-1)+3)mod 16

elseif(A1≤zn＜B1)

S(n)＝(4*s(n-1)+2)mod 16

elseif(B1≤zn＜C1)

S(n)＝(4*s(n-1)+1)mod 16

elseif(zn≥C1)

S(n)＝(4*s(n-1))mod 16

endif

}

Following table is the probability distribution of mobile terminal state migration, and S (n-1) be a current state, and A1, A2 and A3 are the boundary values of state transition probability, the typical case that these migration probabilities energy approximate simulations go out the people model of conversing.

S(n-1)	A1	B1	C1
				0	0	0	2916
1	0	20906	25264
				2	0	0	0
3	0	0	0
				4	0	0	4915
5	0	17170	24969
				6	21856	25887	27099
7	0	0	0
				8	0	0	4522
9	0	5472	16384
				10	21856	21856	24576
11	28246	29622	30802
				12	0	0	5472
13	0	6554	6554
				14	28377	28934	29491
15	29753	32473	32571

Further, in the described step 4: the method that portable terminal is added up described Frame is as follows:

1, transmit leg Frame statistics

After portable terminal received the right of speech grant message, beginning log-on data frame product process was added up the Frame that generates simultaneously.

Data frame type	Correspondence adds 1 counter
		Full rate	CT_T1
1/2 speed	CT_T2
		1/4 speed	CT_T4
1/8 speed	CT_T8

Wherein, CT_T1 is the number of the full rate data frame of transmit leg transmission; CT_T2 is the number of 1/2 speed data frame of transmit leg transmission; CT_T4 is the number of 1/4 speed data frame of transmit leg transmission; CT_T8 is the number of 1/8 speed data frame of transmit leg transmission.

2, receiving side data frame statistics

After portable terminal received the right of speech notification message, the beginning receiving data frames was added up the Frame that receives simultaneously.Except the Frame of 1/8 speed, gps time sends twice to I haven't seen you for ages in Frame, and the recipient solves the value of these fields, if content is all identical, and the value (if there is) of filling bit is also correct, can think that then Frame is correct, otherwise is the mistake frame.

Data frame type	Frame is correct	Correspondence adds 1 counter
			Full rate	Y	CT_R1
Full rate	N	CT_R1_ERR
			1/2 speed	Y	CT_TR2
1/2 speed	N	CT_R2_ERR
			1/4 speed	Y	CT_R4
1/4 speed	N	CT_R4_ERR
			1/8 speed	Y	CT_R8
1/8 speed	N	CT_R8_ERR

Wherein, CT_R1 is the number of the correct frame of full rate of recipient's reception; CT_R1_ERR is the number of the full rate error code frame of recipient's reception; CT_R2 is the number of the correct frame of 1/2 speed of recipient's reception; CT_R2_ERR is the number of 1/2 speed error code frame of recipient's reception; CT_R4 is the number of the correct frame of 1/4 speed of recipient's reception; CT_R4_ERR is the number of 1/4 speed error code frame of recipient's reception; CT_R8 is the number of the correct frame of 1/8 speed of recipient's reception; CT_R8_ERR is the number of 1/8 speed error code frame of recipient's reception.

If the Frame that receives is full rate, 1/2 speed or 1/4 speed, after the recipient confirms that Frame is correct, solve the gps time that comprises in this Frame, use current GPS absolute time (GPScur), deducting the transmission gps time (GPSsnd) of this Frame, is the propagation delay time of this frame just.

The time-delay calculation formula of 1/4 rate frame:

{

if(GPScur≤GPSsnd)

Delay(n)＝GPScur+2 ¹⁶-GPSsnd

elseif

Delay(n)＝GPScur-GPSsnd

endif

}

The time-delay calculation formula of 1/2 speed and full-rate vocoding:

{

if(GPScur≤GPSsnd)

Delay(n)＝GPScur+2 ²⁴-GPSsnd

elseif

Delay(n)＝GPScur-GPSsnd

endif

}

In the communication process (being that some portable terminal applications discharge the process of right of speech to right of speech to it), the recipient adds up the propagation delay time of each Frame, and according to following formula, calculates the average delay and the shake of various speed data frames:

$\stackrel{\‾}{\mathrm{Delay}}=\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\mathrm{Dela}{y}_i$

$\mathrm{RMS}\left(\stackrel{\‾}{\mathrm{Delay}}\right)=\sqrt{\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{({\mathrm{Delay}}_i-\stackrel{\‾}{\mathrm{Delay}})}^2}{N-1}}$

Described PTT Server is responsible for carrying out the collection and the demonstration of the test data of each time communication process.

After right of speech discharged, PTT Server sent the right of speech release message to each portable terminal; After receiving this message, each portable terminal reports the statistics of this communication process by the test result report message.

Further, if desired, the PTT service device can be initiatively to the mobile terminal enquiry statistics, method is: PTTServer sends the test result request message to portable terminal, (right of speech ID: the portable terminal application is after right of speech to carry ID number of the communication process of inquiring about in the message, PTT Server distributes an ID for this conversation, notify each portable terminal, this ID is used to identify this communication process afterwards), portable terminal reports the statistics of this communication process according to right of speech ID by the test result report message.If the test result of portable terminal is lost, perhaps the right of speech ID in right of speech release message or the test result request message is illegal, and portable terminal sends the test result error message.

As shown in Figure 6, its message interaction process comprises the steps:

A, PTT Server send the test result request message to portable terminal;

The statistics of b, portable terminal report test.

Message format of the present invention is as follows:

1, the right of speech free time

Field	Length(bits)
		MSG_TYPE	8

MSG_TYPE: type of message ID

2, the right to apply for words

Field	Length(bits)
		MSG_TYPE	8

MSG_TYPE: type of message ID

3, right of speech is authorized

Field	Length(bits)
		MSG_TYPE	8
FLOOR_ID	8

MSG_TYPE: type of message ID

FLOOR_ID: right of speech ID is distributed by PTT Server, the process that identifies a right to apply for words and converse

4, right of speech notice

Field	Length(bits)
		MSG_TYPE	8
FLOOR_ID	8
		GRANTED_NUM_LEN	4
GRANTED_NUM	GRANTED_NUM_LEN*4

MSG_TYPE: type of message ID

FLOOR_ID: right of speech ID is distributed by PTT Server, the process that identifies a right to apply for words and converse

GRANTED_NUM_LEN: the length of obtaining right of speech user's number mark

GRANTED_NUM: the number mark that obtains the right of speech user

5, right of speech discharges

Field	Length(bits)
		MSG_TYPE	8
FLOOR_ID	8

MSG_TYPE: type of message ID

FLOOR_ID: right of speech ID, with this conversation in right of speech authorize or the right of speech notification message in FLOOR_ID consistent

6, test result request

Field	Length(bits)
		MSG_TYPE	8
FLOOR_ID	8

MSG_TYPE: type of message ID

FLOOR_ID: right of speech ID, authorize with right of speech or the right of speech notification message in FLOOR_ID consistent, expression is to this speaking test result's inquiry

7, test result report

Field	Length(bits)
		MSG_TYPE	8
FLOOR_ID	8
		CONV_MODE	2

If CONV_MODE=0

CT_T1	16
		CT_T2	16
CT_T4	16
		CT_T8	16

If CONV_MODE=1

CT_R1	16
		CT_R1_ERR	16
CT_R1_DELAY	16
		CT_R1_JITTER	16
CT_TR2	16
		CT_R2_ERR	16
CT_R2_DELAY	16
		CT_R2_JITTER	16

CT_R4	16
		CT_R4_ERR	16
CT_R4_DELAY	16
		CT_R4_JITTER	16
CT_R8	16
		CT_R8_ERR	16
CT_RALL_DELAY	16
		CT_RALL_JITTER	16

MSG_TYPE: type of message ID

FLOOR_ID: right of speech ID, consistent with the FLOOR_ID in right of speech free time or the test result request message, expression is to this speaking test result's report

CONV_MODE: call mode, 0 expression transmit leg, 1 expression recipient

CT_T1: the number of the full rate data frame that transmit leg sends

CT_T2: the number of the 1/2 speed data frame that transmit leg sends

CT_T4: the number of the 1/4 speed data frame that transmit leg sends

CT_T8: the number of the 1/8 speed data frame that transmit leg sends

CT_R1: the number of the correct frame of full rate that the recipient receives

CT_R1_ERR: the number of the full rate error code frame that the recipient receives

CT_R1_DELAY: the time delay of full-rate vocoding, unit is a millisecond

CT_R1_JITTER: the shake of full-rate vocoding, unit is a millisecond

CT_R2: the number of the correct frame of 1/2 speed that the recipient receives

CT_R2_ERR: the number of the 1/2 speed error code frame that the recipient receives

The time delay of CT_R2_DELAY:1/2 rate frame, unit is a millisecond

The shake of CT_R2_JITTER:1/2 rate frame, unit is a millisecond

CT_R4: the number of the correct frame of 1/4 speed that the recipient receives

CT_R4_ERR: the number of the 1/4 speed error code frame that the recipient receives

The time delay of CT_R4_DELAY:1/4 rate frame, unit is a millisecond

The shake of CT_4_JITTER:1/4 rate frame, unit is a millisecond

CT_R8: the number of the correct frame of 1/8 speed that the recipient receives

CT_R8_ERR: the number of the 1/8 speed error code frame that the recipient receives

CT_RALL_DELAY: the time delay of all full-rate vocodings, 1/2 rate frame and 1/4 rate frame, unit is a millisecond

CT_RALL_JITTER: the shake of all full-rate vocodings, 1/2 rate frame and 1/4 rate frame, unit is a millisecond

8, test result mistake

Field	Length(bits)
		MSG_TYPE	8
FLOOR_ID	8

MSG_TYPE: type of message ID

FLOOR_ID: right of speech ID, consistent with the FLOOR_ID in right of speech free time or the test result request message.

Claims (16)

1, a kind of test call method of trunking system, is characterized in that, comprises the steps: Step 1: Add a push-to-talk server on the network side, and initiate a trunking test call on the mobile terminal or the network side; Step 2: After the trunking call is established, the mobile terminals compete for the speaking right; Step 3, the mobile terminal that has applied for the right to speak begins to generate data frames; Step 4, the data frame is transmitted according to the processing mode of the voice frame, and the remaining mobile terminals receive the data frame and perform statistics, and report the statistical results to the push-to-talk server; Step 5. After a certain period of time, the mobile terminal with the original speaking right releases the speaking right, triggering a new round of talking right competition. 2. The test calling method of the trunking system according to claim 1, wherein the data frame is dynamically generated according to the model of a typical voice call, and the GPS absolute data when the data frame is assembled is filled in the data frame. time. 3. The test call method of the trunking system according to claim 1, characterized in that, after step 2, it also includes the steps of: If a mobile terminal receives a speaking right notification message from the push-to-talk server during the speaking right application process, indicating that other mobile terminals have applied for the speaking right, then the mobile terminal terminates the speaking right application and starts the data frame receiving and statistics process . 4. The test call method of the trunking system according to claim 1, wherein the data frame can be one of the following four types: full rate frame, 1/2 rate frame, 1/4 rate frame , 1/8 rate frame. 5. The test calling method of the trunking system according to claim 1, characterized in that, the data frame is generated by the mobile terminal sending the data using a pseudo-random process. 6. The test calling method of the trunking system according to claim 1, characterized in that, in step 1, the flow of the mobile terminal initiating the trunking test call includes the following steps: a. The trunking mobile terminal sends a trunking call initiation message to request a trunking test call, and the service option carried in the message is "trunk test call-single call" or "trunk test call-group call"; b. The PTT Server sends a group call paging message to other mobile terminals belonging to the group according to the called number in the mobile terminal call message. The service option carried in the message is "Trunk test call-single call" or "Trunk call Test Call - Group Call"; c. A connection is established between the PTT Server and the calling mobile terminal for transmitting data frames. Step c can occur at any time after step a; d. After receiving the group call paging message, other mobile terminals in the group send a group call paging response and establish a connection with the PTT Server. If the PTT Server waits for a certain period of time, there are still users in the group who do not respond to paging, Then the PTT Server directly forwards to step e, and only sends a talk right idle message to the connected mobile terminal; e. After all users are connected, the PTT Server sends a talk right idle message to all connected mobile terminals, indicating that the talk right is free and available for application. 7. The test call method of the trunking system according to claim 1, characterized in that, the process of initiating the trunking test call by the network side in step 1 includes the following steps: a. The operator operates on the PTT Server and triggers a trunking test call to the group through the group number. The PTT Server sends a trunking call paging message to all mobile terminals in the group. The service option carried in the message is "trunking test call-single call" or "trunk test call-group call"; b. After receiving the group call paging message, each mobile terminal sends a group call paging response to establish a connection with the PTT Server. If the PTT Server waits for a certain period of time, and there are still users in the group who do not respond to the paging, then the PTT Server directly goes to step c, and only sends a talk right idle message to the connected mobile terminal; c. After all users are connected, the PTT Server sends a talk right idle message to all connected mobile terminals, indicating that the talk right is free and available for application. 8. The test calling method of the trunking system according to claim 1, characterized in that the process of the mobile terminal competing for the speaking right in the step 2 includes the following steps: a. In the connected state, the mobile terminal sends a speaking right application message to the PTT Server; b. If the current speaking right is idle, the PTT Server sends a speaking right grant message to the mobile terminal. At this time, the mobile terminal reverse channel is opened and data frames can be sent upwards, otherwise the PTT Server sends a speaking right rejection message to the mobile terminal; c. The PTT Server sends a talk right notification message to other connected mobile terminals in the group, notifying it of the terminal ID that has applied for the talk right. After receiving the talk right notification message, the mobile terminal starts to receive data frames and make statistics. 9. The test calling method of the trunking system according to claim 1, characterized in that, the procedure for the mobile terminal to release the speaking right in step 5 includes the following steps: a. In the connected state, the mobile terminal with the right to speak sends a right to speak release message to the PTT Server; b. The PTT Server withdraws the speaking right, and sends a speaking right idle message to all connected mobile terminals in the group; if necessary, the PTT Server can actively send a speaking right idle message to reclaim the speaking right. In this case, there is no need for message a; c. The mobile terminal sends a test result report message to the PTT Server to report the statistical results of this round of testing. 10. The test calling method of the trunking system according to claim 1, further comprising step 6: if necessary, the push-to-talk server can actively query the statistical results from the mobile terminal; the process is: PTT Server sends a test result request message to the mobile terminal, and the message carries the ID number of the inquired call process; The mobile terminal reports the statistical results of the call process through the test result report message according to the speaking right ID; If the test result of the mobile terminal is lost, or the talk right ID in the talk right release message or the test result request message is illegal, the mobile terminal sends a test result error message. 11. The test call method of the trunking system according to claim 1, wherein said performing statistics comprises: judging whether there is a frame error, and calculating the average time delay and jitter. 12. The test call method of the trunking system according to claim 2, characterized in that, the GPS absolute time will be sent at least twice in the data frame, and the mobile terminal receiving the data will decipher the values of these fields, if the contents are the same, And the value of the filling bit is also correct, then the data frame can be considered correct, otherwise it is an error frame. 13. The test call method of the trunking system according to claim 12, characterized in that, after confirming that the data frame is correct, the GPS time contained in the data frame is solved, and the current GPS absolute time is used to subtract the data frame The sending GPS time is the transmission delay of the frame. 14. The test call method of the trunking system according to claim 13, characterized in that, the average time delay of the data frames of various rates is: $\stackrel{\&OverBar;}{\mathrm{Delay}}=\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}{\mathrm{Delay}}_i,$ Where delay _i refers to the transmission delay of a single data frame. 15. The test calling method of the trunking system according to claim 14, characterized in that, the jitters of the data frames at various rates are: $\mathrm{<span\; class="notranslate">\; RMS</span>}<span\; class="notranslate">\; (</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; Delay</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\sqrt{\frac{\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Delay</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; Delay</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; .</span>$ 16. The method for calling a test of a trunking system according to claim 1, further comprising the step of displaying the statistics result by the push-to-talk server.

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