CN1997232A - A method for switching determination of the mobile multi-media broadcast terminal - Google Patents
A method for switching determination of the mobile multi-media broadcast terminal Download PDFInfo
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- CN1997232A CN1997232A CNA200610157159XA CN200610157159A CN1997232A CN 1997232 A CN1997232 A CN 1997232A CN A200610157159X A CNA200610157159X A CN A200610157159XA CN 200610157159 A CN200610157159 A CN 200610157159A CN 1997232 A CN1997232 A CN 1997232A
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Abstract
This invention relates to money switch and judgment method of multi-media broadcast receive terminal, which comprises the following steps: a, terminal receives neighbor network information from mobile multi-media broadcast front end system; b, terminal computes the data sampling for error codes and if error code rate is larger than error rate gate, then judging the data as error for executing step c, otherwise for step b; c, terminal computes error rate and judging whether the rate proportion is super error rate gate; if yes, then terminal monitors near signal channel into step d; otherwise in step b; d, terminal comparing received network with near each network signal quality.
Description
Technical field
The present invention relates to the digital mobile communication field, relate in particular to a kind of switching (handover) decision method of mobile multi-media broadcast terminal.
Background technology
In recent years, digital mobile multimedia broadcasting technology and standard evolution are rapid, for example (the digital video broadcast-handheld formula receives Ou Zhou DVB-H: Digital Video Broadcast Handheld), the MediaFLO of the U.S. (the single forward link of medium: Media Forward Link Only) and China CMMB (China Mobile multimedia broadcasting: China Mobile Multimedia Broadcasting) etc., all adopt (OFDM: modulation technique Othogonal Frequency Division Multiplexing) based on OFDM, in order to save power consumption of terminal, all adopted time division way to send and reception, promptly concentrate and on a plurality of OFDM symbols, modulate continuously at the multimedia data information of every broadcast service on the time domain, mobile multi-media broadcast terminal also concentrates on this time period and receives this multimedia service, and in the other times of every frame, terminal is in closes (Off-time) state, energy-conservation to reach terminal.
Mobile media broadcasting network in different regions or different frequency can broadcast otherness MBMS service content, so when the Mobile Multimedia Broadcasting user moves to regional intersection or receiving frequency signals will take place to switch between network when relatively poor, receive service quality to improve terminal, a kind of terminal switch determining method need be provided.
Mobile media broadcasting network all adopts the one-way communication mode, promptly from transmitter system to mobile receiving system, oppositely can use mobile communication network and finish functions such as authentication, program request, so the Mobile Multimedia Broadcasting front end system can not carry out switching controls to terminal in real time, cause handover operation all independently to be finished by terminal, promptly one-way communication switches.
In order to improve Mobile Multimedia Broadcasting service quality to reach seamless switching, terminal need do homework in advance to handover operation, terminal just can be monitored the adjacent networks channel in the service shut-in time so, comprise Traffic Channel or control channel, traversal adjacent area network for fear of the terminal poor efficiency, so the Mobile Multimedia Broadcasting front end system need provide adjacent area network relevant configured parameter, and offer mobile multi-media broadcast terminal by air interface; If terminal does not stop to monitor adjacent networks, then very big to the power consumption of terminal influence, so a kind of mobile multi-media broadcast terminal switch determining method need be provided, under the prerequisite that improves terminal receiving multimedia broadcast service quality, influence is reduced to minimum to power consumption of terminal again.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of switch determining method of realizing mobile multi-media broadcast terminal, and under the prerequisite that improves terminal reception multimedia service quality, it is minimum that power consumption of terminal is dropped to.
In order to achieve the above object, the invention provides a kind of switch determining method of mobile multi-media broadcast terminal, may further comprise the steps:
(1) terminal receives and comes from the adjacent area network information that the Mobile Multimedia Broadcasting front end system sends, and the described adjacent area network information comprises frequency numbering, centre frequency and the bandwidth of adjacent area the number networks, adjacent area network-level, adjacent area network number, the basic carrier frequency in adjacent area;
(2) end-on receipts sampling of data carries out error rate calculation, is the error code data if the error rate, is then judged these data greater than error rate thresholding, execution in step (3), otherwise continue execution in step (2);
(3) terminal is calculated error rate ratio, judges that the error rate than whether surpassing the error rate than thresholding, if then terminal begins to monitor channels of neighboring areas according to the adjacent area network information, changes step (4) over to, otherwise returns step (2);
(4) terminal more now receives the signal quality of network and adjacent each network, if the signal quality of adjacent networks greater than the signal quality that now receives network, then terminal switches to the adjacent networks of described signal quality maximum, otherwise does not switch.
The method according to this invention, the adjacent area the number networks in the network information of described step (1) adjacent area is represented adjacent area the number networks of region; The adjacent area network-level is represented the rank of adjacent area network; A frequency numbering of the frequency numbering expression adjacent networks of the basic carrier frequency in adjacent area, the unique corresponding centre frequency of each frequency; Centre frequency provides concrete center-frequency parameters; Bandwidth is represented mobile media broadcasting network wireless frequency bandwidth; Wherein, adjacent area network number and network-level together unique identification a network.
The method according to this invention, described adjacent area network-level are divided into 1 to 5 grade.
The method according to this invention, described bandwidth are 8MHz bandwidth or 2MHz bandwidth.
Front end system has the CRC position in the method according to this invention, described step (2) in receiving data, and terminal is according to coming the CRC position to judge the error rate.
Error rate handoff threshold is by mobile multi-media broadcast terminal system definition in the method according to this invention, described step (2).
The method according to this invention, error rate handoff threshold are 6%～9%.
Error rate ratio equals to receive the data number of times greater than error rate thresholding number of times divided by extracting Mobile Multimedia Broadcasting in a period of time in the extraction Mobile Multimedia Broadcasting reception data number of times in a period of time in the method according to this invention, described step (3).
The method according to this invention, in the described step (3) error rate than thresholding by mobile multimedia broadcast receiving terminal system definition.
The method according to this invention, the described error rate is 55%～70% than thresholding.
The method according to this invention, described step (3) if in the error rate than greater than the error rate than thresholding, terminal starts monitoring adjacent area network when service is closed.
In a word, the invention provides a kind of method of mobile multi-media broadcast terminal switch decision, when the error rate in a period of time greater than after setting thresholding, according to the adjacent area network information that front end system provides, start and monitor the adjacent area network, by with the E of adjacent area network
b/ N
oOr SNR relatively, if the energy per bit of adjacent area and disturbance spectrum density ratio or signal to noise ratio are big and now receive network, then terminal switches to adjacent networks.This method provides and has started the decision method of monitoring the adjacent area network, satisfies condition and just monitors the adjacent area network, thereby both improved terminal reception multimedia service quality, has reduced power consumption of terminal again.
Description of drawings
Fig. 1 is an embodiment of the invention Mobile Multimedia Broadcasting adjacent area network diagram;
Fig. 2 is that the embodiment of the invention is a kind of based on OFDM technology multi-media broadcast terminal monitoring schematic diagram;
Fig. 3 is an embodiment of the invention mobile multi-media broadcast terminal switch decision process chart.
Embodiment
The present invention is further detailed explanation below in conjunction with drawings and Examples.
Figure 1 shows that the mobile media broadcasting network schematic diagram.User terminal is at A, and B moves in three network areas of C, and adjacent area network each other.
Mobile multi-media broadcast terminal in the A network is monitored B according to the adjacent area network information, the C network, and this information is planned and configuration by the Mobile Multimedia Broadcasting front end system, and is sent to terminal by transmitter by air interface.Table 1 is to describe the adjacent area network information, and wherein the adjacent area network information comprises frequency numbering, centre frequency and the bandwidth information of adjacent area the number networks, adjacent area network-level, adjacent area network number, the basic carrier frequency in adjacent area, and terminal is monitored the adjacent networks channel according to these information.Wherein ' adjacent area the number networks ' represents adjacent area the number networks of region; The rank of ' adjacent area network-level ' expression network for example is divided into network 1～5 grade; ' adjacent area network number ' and network-level together unique identification a network; A frequency numbering of ' the frequency numbering of the basic carrier frequency in adjacent area ' expression adjacent networks, the unique corresponding centre frequency of each frequency; ' centre frequency ' provides concrete center-frequency parameters; ' bandwidth ' expression mobile media broadcasting network wireless frequency different bandwidth is as 8MHz bandwidth, 2MHz bandwidth.
Table 1 adjacent area network information instruction card
| Field | Explanation |
| Adjacent area the number networks | Provide adjacent area the number networks |
| The adjacent area network-level | Provide the rank of network, have 5 grades respectively |
| The adjacent area network number | With network-level unique identification together a network |
| The frequency numbering of the basic carrier frequency in adjacent area | Provide a frequency numbering of adjacent networks, the unique corresponding centre frequency of each frequency |
| Centre frequency | Provide concrete center-frequency parameters |
| Bandwidth | Mobile media broadcasting network wireless frequency different bandwidth is as 8MHz bandwidth, 2MHz bandwidth |
Figure 2 shows that a kind of based on OFDM technology multi-media broadcast terminal monitoring schematic diagram, include a plurality of OFDM symbols in the frames per second that terminal receives, the data message of every multimedia service concentrates in the continuous symbol and transmits, promptly the mode with the time-division transmits, so the time terminal beyond the service of every frame receiving multimedia broadcast can be monitored the adjacent area network, when the Mobile Multimedia Broadcasting user in the A network to A, when three adjacent networks zones of B and C are mobile, terminal is carried out the adjacent area according to the switch decision condition and is monitored, Figure 2 shows that user terminal is before and after the A network receives service c, monitor C and B network respectively according to the neighboring BS information that the A network provides, obtain B, the information of C network.
Terminal is by judging whether the error rate (BER:Bit Error Rate) decision monitors the adjacent area network channel.Mobile multimedia broadcast system need increase relevant bit-error rate information description for this reason, and this information is by increasing by 4 byte CRC position (CRC: CyclicRedundancy Check) realize by the front end system side at the afterbody that sends data.According to the CRC-CCITT standard, the generator multinomial is:
x
32+x
26+x
23+x
22+x
16+x
12+x
11+x
10+x
8+x
7+x
5+x
4+x
2+x+1
In end side, whether adjudicate the error rate greater than error rate thresholding according to CRC, if greater than, then add up the error rate ratio in a period of time, if than thresholding, terminal system need start in the adjacent area network information that out of service time (Off-time) Rigen provides according to front end system monitors the adjacent area network channel greater than the error rate.
Because the wireless air channel is sudden, the contingency that causes the error rate, for reducing this possibility, so error rate ratio of the reception data in statistics a period of time, need to increase the statistics of error rate ratio for this reason, this ratio equals " extract mobile multimedia in a period of time and receive in the data number of times number of times greater than error rate thresholding " divided by " extract mobile multimedia in a period of time and receive the data number of times ", also " error rate is than thresholding " to be set, if the error rate is than surpassing this thresholding, then start the adjacent area network monitoring, otherwise do not need to monitor the adjacent area network.
Figure 3 shows that terminal area switch decision flow chart, its key step is as follows:
Step 301: when terminal is in state of activation, promptly receiving the Mobile Multimedia Broadcasting service, in a period of time, sampling receives data and carries out error rate calculation and statistics;
Step 302: is the error code data if receive error rates of data just above thresholding 7%, statistics error rate ratio, and the terminal judges error rate is than whether surpassing error code than thresholding 60%, if change step 503 over to; Otherwise, proceed error rate calculation;
Step 303: terminal is then monitored the adjacent area according to the adjacent area network information, obtains adjacent area E
b/ N
oInformation;
Step 304: terminal will now receive the E of network and adjacent each network
b/ N
oValue compares, if now receive the network values maximum, then changes step 301 over to, is not more than adjacent each network values, execution in step 305 if now receive network values;
Step 305: terminal switches to E
b/ N
oThe adjacent area of ratio maximum receives the Mobile Multimedia Broadcasting service of this adjacent area, finishes.
Above-mentioned error rate thresholding can be 6%～9%, and the error rate can be 55%～70% than thresholding.
The also available frame error rate of the above-mentioned error rate replaces, and its implementation is identical with the error rate.
Above-mentioned E
b/ N
oInformation also can replace with signal to noise ratio snr information, perhaps the parameter that other can the reflected signal quality.
Claims (11)
1, a kind of switch determining method of mobile multi-media broadcast terminal may further comprise the steps:
(1) terminal receives and comes from the adjacent area network information that the Mobile Multimedia Broadcasting front end system sends, and the described adjacent area network information comprises frequency numbering, centre frequency and the bandwidth of adjacent area the number networks, adjacent area network-level, adjacent area network number, the basic carrier frequency in adjacent area;
(2) end-on receipts sampling of data carries out error rate calculation, is the error code data if the error rate, is then judged these data greater than error rate thresholding, execution in step (3), otherwise continue execution in step (2);
(3) terminal is calculated error rate ratio, judges that the error rate than whether surpassing the error rate than thresholding, if then terminal begins to monitor channels of neighboring areas according to the adjacent area network information, changes step (4) over to, otherwise returns step (2);
(4) terminal more now receives the signal quality of network and adjacent each network, if the signal quality of adjacent networks greater than the signal quality that now receives network, then terminal switches to the adjacent networks of described signal quality maximum, otherwise does not switch.
2, the switch determining method of mobile multi-media broadcast terminal as claimed in claim 1 is characterized in that: the adjacent area the number networks in the network information of described step (1) adjacent area is represented adjacent area the number networks of region; The adjacent area network-level is represented the rank of adjacent area network; A frequency numbering of the frequency numbering expression adjacent networks of the basic carrier frequency in adjacent area, the unique corresponding centre frequency of each frequency; Centre frequency provides concrete center-frequency parameters; Bandwidth is represented mobile media broadcasting network wireless frequency bandwidth; Wherein, adjacent area network number and network-level together unique identification a network.
3, the switch determining method of mobile multi-media broadcast terminal as claimed in claim 2 is characterized in that: described adjacent area network-level is divided into 1 to 5 grade.
4, the switch determining method of mobile multi-media broadcast terminal as claimed in claim 2 is characterized in that: described bandwidth is 8MHz bandwidth or 2MHz bandwidth.
5, the switch determining method of mobile multi-media broadcast terminal as claimed in claim 1 is characterized in that: front end system has the CRC position in the described step (2) in receiving data, and terminal is according to coming the CRC position to judge the error rate.
6, the switch determining method of mobile multi-media broadcast terminal as claimed in claim 1 is characterized in that: error rate handoff threshold is by mobile multi-media broadcast terminal system definition in the described step (2).
7, the switch determining method of mobile multi-media broadcast terminal as claimed in claim 6 is characterized in that: error rate handoff threshold is 6%～9%.
8, the switch determining method of mobile multi-media broadcast terminal as claimed in claim 1 is characterized in that: error rate ratio equals to receive the data number of times greater than error rate thresholding number of times divided by extracting Mobile Multimedia Broadcasting in a period of time in the extraction Mobile Multimedia Broadcasting reception data number of times in a period of time in the described step (3).
9, the switch determining method of mobile multi-media broadcast terminal as claimed in claim 1 is characterized in that: in the described step (3) error rate than thresholding by mobile multimedia broadcast receiving terminal system definition.
10, the switch determining method of mobile multi-media broadcast terminal as claimed in claim 9 is characterized in that: the described error rate is 55%～70% than thresholding.
11, the switch determining method of mobile multi-media broadcast terminal as claimed in claim 1 is characterized in that: described step (3) if in the error rate than greater than the error rate than thresholding, terminal starts monitoring adjacent area network when service is closed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610157159XA CN100544492C (en) | 2006-11-30 | 2006-11-30 | A kind of switch determining method of mobile multi-media broadcast terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200610157159XA CN100544492C (en) | 2006-11-30 | 2006-11-30 | A kind of switch determining method of mobile multi-media broadcast terminal |
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| CN1997232A true CN1997232A (en) | 2007-07-11 |
| CN100544492C CN100544492C (en) | 2009-09-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841767A (en) * | 2009-03-16 | 2010-09-22 | 中兴通讯股份有限公司 | Tradeoff decision method and system for sending multimedia broadcasting and multicast service |
| CN102572385A (en) * | 2010-12-07 | 2012-07-11 | 中国电信股份有限公司 | Video signal transmission method, wireless video server and video monitoring system |
-
2006
- 2006-11-30 CN CNB200610157159XA patent/CN100544492C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841767A (en) * | 2009-03-16 | 2010-09-22 | 中兴通讯股份有限公司 | Tradeoff decision method and system for sending multimedia broadcasting and multicast service |
| WO2010105533A1 (en) * | 2009-03-16 | 2010-09-23 | 中兴通讯股份有限公司 | Tradeoff decision method and system for transmitting multimedia broadcast multicast service |
| CN102572385A (en) * | 2010-12-07 | 2012-07-11 | 中国电信股份有限公司 | Video signal transmission method, wireless video server and video monitoring system |
| CN102572385B (en) * | 2010-12-07 | 2015-09-16 | 中国电信股份有限公司 | The transmission method of vision signal, wireless video server and video monitoring system |
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| Publication number | Publication date |
|---|---|
| CN100544492C (en) | 2009-09-23 |
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