CN100450312C - Switch decision method of mobile multimedia broadcast terminal - Google Patents
Switch decision method of mobile multimedia broadcast terminal Download PDFInfo
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- CN100450312C CN100450312C CNB2006101277356A CN200610127735A CN100450312C CN 100450312 C CN100450312 C CN 100450312C CN B2006101277356 A CNB2006101277356 A CN B2006101277356A CN 200610127735 A CN200610127735 A CN 200610127735A CN 100450312 C CN100450312 C CN 100450312C
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001228 spectrum Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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Abstract
The method comprises: a) when the terminal is at active state, it samples the data packet to make bit error rate and frame error rate calculation; if the bit error rate or frame error rate is more than a switching threshold, then the data packet is considered as a error packet; b) the terminal calculates the error packet rate, and decides if the error packet rate is more than a threshold of error packet rate; if yes, the terminal starts to listen in neighboring channel; otherwise, returning to step a; c) the terminal compares the signals quality of current sector with the one of neighboring sectors; if signal qualities from all sectors are less than the desired lowest threshold, the terminal stops receiving the multimedia broadcast service; if signal qualities from all sectors are more than the lowest demodulation threshold of the sector where the terminal originally locates at, then the terminal is switched to the sector with the best signal quality; otherwise, not switching.
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 Orthogonal Frequency Division Multiplexing) based on OFDM, in order to save the receiving terminal power consumption, 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 multimedia broadcast receiving terminal also concentrates on this time period and receives this multimedia service, and in the other times of every frame, receiving 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 multimedia service content, so when the Mobile Multimedia Broadcasting user moves to regional intersection or receiving frequency signals will switch when relatively poor, receive service quality to improve, 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 receiving terminal in real time, cause handover operation all to be finished by receiving terminal, promptly one-way communication switches.
In order to improve Mobile Multimedia Broadcasting service quality to reach seamless switching, receiving terminal need do homework in advance to handover operation, receiving terminal just can be monitored the adjacent sectors channel in the service shut-in time so, comprise Traffic Channel or control channel (system logic channel), but it is very big to the power consumption of terminal influence to monitor neighbor cell, 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 multimedia broadcast receiving terminal, and under the prerequisite that improves terminal reception multimedia service quality, it is minimum that power consumption of terminal is dropped to.
The invention provides a kind of switch determining method of mobile multi-media broadcast terminal, terminal receives and comes from the adjacent area network information that the Mobile Multimedia Broadcasting front end system sends, and carry out switch decision according to the adjacent area network information, described terminal is according to following method switch decision:
(a) terminal is in state of activation, and the data from the sample survey bag carries out the error rate or frame error rate and calculates, if the error rate or frame error rate greater than handoff threshold, then this packet is the error code bag;
(b) terminal is calculated bit error rate, judges whether bit error rate surpasses error code bag ratio thresholding, if then terminal begins to monitor channels of neighboring areas; Otherwise return step (a);
(c) the terminal signal quality of this sector and adjacent each sector relatively, if the signal quality of all sectors all less than the required minimum threshold of demodulation, then terminal stops all and receives Mobile Multimedia Broadcasting services; If the signal quality of adjacent sectors is greater than the original residing sector of terminal and greater than the demodulation minimum threshold, then receiving terminal switches in the adjacent sectors of described signal quality maximum, otherwise does not switch.
Wherein, the front end system side has the CRC position in the described step (a) in the physical layer data bag, and terminal is according to coming the CRC position to judge the error rate or frame error rate.
Wherein, error rate handoff threshold is 6%～9% in the described step (a).
Wherein, bit error rate in the described step (b)=greater than the number of data packets of handoff threshold/randomly draw number of data packets.
Wherein, error code bag ratio thresholding is 55%～70% in the described step (b).
Wherein, described step (b) if in bit error rate greater than error code bag ratio thresholding, terminal starts monitoring when service is closed.
Wherein, the middle signal quality of described step (c) is by the bit energy/disturbance spectrum density E of signal
b/ N
oPerhaps signal to noise ratio snr is judged.
Wherein, the described adjacent area network information comprises one or more in adjacent area number, adjacent area sub-network sequence number, adjacent area frequency range and the frequency.
Wherein, the adjacent area number in the network information of described adjacent area is represented the adjacent sectors number of region; Adjacent area sub-network sequence number is the adjacent area sign; The adjacent area frequency range is frequency spectrum place, an adjacent area frequency range, and the adjacent area frequency is the concrete frequency of adjacent sectors.
In a word, the invention provides a kind of method of mobile multimedia broadcast receiving terminal switch decision, front end sends the adjacent area network information to terminal, when the error rate or frame error rate greater than after setting thresholding, starting terminal is monitored the adjacent area, by with the E of adjacent area
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 this sector, then terminal switches to adjacent sectors.This method need not monitored the adjacent area in all serve the shut-in time, provide to start to monitor decision method, and satisfy condition and just monitor the adjacent area, otherwise the regular traffic processing, thereby both improved terminal reception multimedia service quality, reduced power consumption of terminal again.
Description of drawings
Fig. 1 is that the embodiment of the invention is a kind of based on OFDM technology mobile media broadcasting network schematic diagram;
Fig. 2 is an embodiment of the invention multimedia broadcasting network terminal monitoring schematic diagram;
Fig. 3 for the embodiment of the invention increase the CRC position after the physical layer data bag form schematic diagram;
Fig. 4 is an embodiment of the invention mobile multimedia broadcast receiving terminal switch decision process chart.
Embodiment
The present invention is further detailed explanation below in conjunction with drawings and Examples.
Figure 1 shows that a kind of based on OFDM technology mobile media broadcasting network schematic diagram.User terminal is at A, and B moves in three network areas of C.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 every frame receives service can be monitored the adjacent area, when the Mobile Multimedia Broadcasting user in the A network when three adjacent networks zones of A, B and C are mobile, terminal can be carried out the adjacent area and be monitored, Figure 2 shows that user terminal is before and after the A network receives service c, monitor C and B network respectively, obtain B, the schematic diagram of the information of C sector.
Terminal is by judging whether the error rate (BER:Bit Error Rate) decision monitors adjacent sector channel.Mobile multimedia broadcast system need increase relevant bit-error rate information description for this reason, and this information is by increasing CRC position (CRC: Cyclic RedundancyCheck) realize by system's emitting side in the physical layer data bag.As shown in Figure 3, the medium Access Layer is surrounded by 142 bytes, and on this basis, physical layer data wraps in afterbody increases by 2 byte CRC check positions, and according to the CRC-CCITT standard, the generator multinomial is:
g(x)＝x
16+x
12+x
5+1
In the receiving terminal side, whether adjudicate the error rate greater than handoff threshold according to CRC, if greater than, terminal system need start the channel of monitoring adjacent sectors in out of service time (Off-time) lining.
Because the mobile multi-media broadcasting data amount is very big in every frame, if every bag data are all calculated the error rate, first need not, second influence causes power consumption more greatly to terminal system, three speed cause non real-time slowly, calculate the error rate so in the packet of every multimedia service, randomly draw the packet of some, need to increase the calculating of bit error rate for this reason, this ratio equals " greater than the number of data packets of handoff threshold " divided by " randomly drawing number of data packets ", " error code bag ratio thresholding " also will be set, if bit error rate surpasses this ratio thresholding, then start adjacent sectors and monitor, otherwise do not need to monitor adjacent sectors.
Terminal is monitored B according to adjacent area list information, the C sector, 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.The information content comprises one or more in adjacent area number, adjacent area network-level, adjacent area network sequence number, the basic carrier frequency in adjacent area and frequency numbering, centre frequency and the bandwidth, and wherein the adjacent area number is represented the adjacent sectors number 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.
Figure 4 shows that terminal area switch decision flow chart, its key step is as follows:
Step 401: when terminal is in state of activation, promptly receiving the Mobile Multimedia Broadcasting service, the data from the sample survey bag carries out error rate calculation;
Step 402: if this packet error rate surpasses thresholding 7% is the error code bag just, calculates bit error rate, and whether the terminal judges bit error rate surpasses error code bag ratio thresholding 60%, if change step 403 over to; Otherwise, proceed bit error rate and calculate;
Step 403: terminal is then monitored the adjacent area according to adjacent area list information, obtains adjacent area E
b/ N
oInformation;
Step 404: the E of terminal judges local area and adjacent area maximum
b/ N
oWhether value less than the demodulation threshold of minimum, and for example 0, if change step 406 over to; Otherwise, execution in step 405;
Step 405: terminal is with the E of local area and adjacent area
b/ N
oValue compares, if local area value maximum then changes step 401 over to, if the local area value is not more than the adjacent area value, and execution in step 407;
Step 406: terminal finishes to receive service, and promptly terminal can not continue the demodulation mobile multi-media broadcasting data again, finishes.
Step 407: 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 handoff threshold can be 6%～9%, and error code bag ratio thresholding can be 55%～70%.
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 (9)
1, a kind of switch determining method of mobile multi-media broadcast terminal, it is characterized in that: terminal receives and comes from the adjacent area network information that the Mobile Multimedia Broadcasting front end system sends, and carry out switch decision according to the adjacent area network information, described terminal is according to following method switch decision:
(a) terminal is in state of activation, and the data from the sample survey bag carries out the error rate or frame error rate and calculates, if the error rate or frame error rate greater than handoff threshold, then this packet is the error code bag;
(b) terminal is calculated bit error rate, judges whether bit error rate surpasses error code bag ratio thresholding, if then terminal begins to monitor channels of neighboring areas; Otherwise return step (a);
(c) the terminal signal quality of this sector and adjacent each sector relatively, if the signal quality of all sectors all less than the required minimum threshold of demodulation, then terminal stops all and receives Mobile Multimedia Broadcasting services; If the signal quality of adjacent sectors is greater than the original residing sector of terminal and greater than the demodulation minimum threshold, then receiving terminal switches in the adjacent sectors of described signal quality maximum, otherwise does not switch.
2, the method for claim 1 is characterized in that: the front end system side has the CRC position in the described step (a) in the physical layer data bag, and terminal is according to coming the CRC position to judge the error rate or frame error rate.
3, the method for claim 1 is characterized in that: error rate handoff threshold is 6%～9% in the described step (a).
4, the method for claim 1 is characterized in that: bit error rate in the described step (b)=and greater than the number of data packets of handoff threshold/randomly draw number of data packets.
5, the method for claim 1 is characterized in that: error code bag ratio thresholding is 55%～70% in the described step (b).
6, the method for claim 1 is characterized in that: described step (b) if in bit error rate greater than error code bag ratio thresholding, terminal starts monitoring when service is closed.
7, the method for claim 1 is characterized in that: signal quality is by the bit energy/disturbance spectrum density E of signal in the described step (c)
b/ N
oPerhaps signal to noise ratio snr is judged.
8, the method for claim 1 is characterized in that, the described adjacent area network information comprises one or more in adjacent area number, adjacent area sub-network sequence number, adjacent area frequency range and the frequency.
9, method as claimed in claim 8 is characterized in that: the adjacent area number in the network information of adjacent area is represented the adjacent sectors number of region; Adjacent area sub-network sequence number is the adjacent area sign; The adjacent area frequency range is frequency spectrum place, an adjacent area frequency range, and the adjacent area frequency is the concrete frequency of adjacent sectors.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101277356A CN100450312C (en) | 2006-09-01 | 2006-09-01 | Switch decision method of mobile multimedia broadcast terminal |
| PCT/CN2006/003774 WO2008028366A1 (en) | 2006-09-01 | 2006-12-30 | Method for judging handover used by a mobile multimedia broadcast terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101277356A CN100450312C (en) | 2006-09-01 | 2006-09-01 | Switch decision method of mobile multimedia broadcast terminal |
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| CN100450312C true CN100450312C (en) | 2009-01-07 |
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| CN101873540A (en) * | 2010-06-10 | 2010-10-27 | 东莞市泰斗微电子科技有限公司 | Method for switching mobile multimedia broadcasting services and corresponding receiving device |
| CN110726809A (en) * | 2019-10-19 | 2020-01-24 | 北京工业大学 | Design method of high-reliability combustible gas state monitoring and alarming equipment |
| CN113012504A (en) * | 2021-02-24 | 2021-06-22 | 宜春职业技术学院（宜春市技术工人学校） | Multi-person dance teaching interactive projection method, device and equipment |
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| CN1212593A (en) * | 1997-08-28 | 1999-03-31 | 摩托罗拉公司 | Method of providing subscriber unit with neighbor cell information during ongoing communication |
| CN1358038A (en) * | 2000-12-07 | 2002-07-10 | Sk电信股份有限公司 | Method of supporting area-crossing switching decision process |
| CN1504053A (en) * | 2000-12-14 | 2004-06-09 | ���廥������˾ | Switching between ultrawide broadband cell |
| CN1610419A (en) * | 2003-10-17 | 2005-04-27 | 华为技术有限公司 | Method for switching aggregated terminal on receiving business state |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04274627A (en) * | 1991-03-01 | 1992-09-30 | Toshiba Corp | Mobile station equipment |
| US6108322A (en) * | 1996-06-28 | 2000-08-22 | Motorola, Inc. | Method of enabling handoff |
| JP2001258057A (en) * | 2000-03-13 | 2001-09-21 | Nec Commun Syst Ltd | Mobile communication system and hands-off method for wireless speech channel |
| US7164915B2 (en) * | 2003-12-19 | 2007-01-16 | Interdigital Technology Corporation | Handover in a wireless local area network (WLAN) |
| CN100463562C (en) * | 2005-01-19 | 2009-02-18 | 中兴通讯股份有限公司 | Method of switching between base stations in personal handheld telephone system |
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2006
- 2006-09-01 CN CNB2006101277356A patent/CN100450312C/en active Active
- 2006-12-30 WO PCT/CN2006/003774 patent/WO2008028366A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1212593A (en) * | 1997-08-28 | 1999-03-31 | 摩托罗拉公司 | Method of providing subscriber unit with neighbor cell information during ongoing communication |
| CN1358038A (en) * | 2000-12-07 | 2002-07-10 | Sk电信股份有限公司 | Method of supporting area-crossing switching decision process |
| CN1504053A (en) * | 2000-12-14 | 2004-06-09 | ���廥������˾ | Switching between ultrawide broadband cell |
| CN1610419A (en) * | 2003-10-17 | 2005-04-27 | 华为技术有限公司 | Method for switching aggregated terminal on receiving business state |
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| CN1960573A (en) | 2007-05-09 |
| WO2008028366A1 (en) | 2008-03-13 |
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