CN101128064A - Wireless link switching method in wireless communication system - Google Patents
Wireless link switching method in wireless communication system Download PDFInfo
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- CN101128064A CN101128064A CNA2007101615200A CN200710161520A CN101128064A CN 101128064 A CN101128064 A CN 101128064A CN A2007101615200 A CNA2007101615200 A CN A2007101615200A CN 200710161520 A CN200710161520 A CN 200710161520A CN 101128064 A CN101128064 A CN 101128064A
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Abstract
The utility model provides a switching method of the wireless link in the mobile communication system, which is characterized in that the destination wireless link is established after deciding switching the system equipment and the switching instructions of wireless link is transmitted to the subscriber equipment from the source wireless downlink. The subscriber equipment transmit the signal with special sequence from the destination wireless uplink after receiving the switching instructions of wireless link. The system equipment transmits the signal with special sequence from the destination wireless downlink if detecting the special sequence from the destination wireless uplink, the subscriber equipment transmits the successful information of switching from the destination wireless uplink after detecting the special sequence from the destination wireless downlink, but no signal can be transmitted from the destination wireless downlink before confirming receiving the special sequence from the destination wireless uplink; when the system equipment receive the successful message of switching replied by the subscriber equipment, the switching is completed. The utility model has the advantages that the disturbance in downlink and the system can be reduced, the success rate of switching can be improved.
Description
Technical field
The present invention relates to mobile communication system, relate in particular to the Radio Link changing method in a kind of mobile communication system.
Background technology
Mobile communication system generally adopts the support of honeycomb networking to realize that wide area covers.When the subscriber equipment that is in connection status when a sub-district moves to another sub-district; mobile communication system can start handoff procedure usually; make subscriber equipment connect with new Serving cell and with the release that is connected of former Serving cell, thereby guarantee the business transmission of subscriber equipment.At present, handoff technique mainly contains direct-cut operation, soft handover and baton handover etc.Switching with the minizone similarly is the Radio Link switching of inside, same sub-district, describes for unified, and the switching with the minizone describes below.
In the direct-cut operation, subscriber equipment switches to the connection that needs to cut off before the Target cell with the cell-of-origin, makes the service quality of system cannot say for sure card, but realizes simple; And soft hand-off needs the descending of subscriber equipment and cell-of-origin and Target cell to keep in communication simultaneously, and the upward signal that base station side is received also merges processing, has improved the service quality of system, but has increased the complexity of system; And the baton handover technology has been applied in TD SDMA (TD-SCDMA) mobile communication system, it be with the current service cell communication in, measure the propagation time difference of subscriber equipment signal in advance to cell-of-origin and Target cell, when switching generation, directly send service signal to Target cell according to timing, and the descending communication of keeping earlier with the cell-of-origin, compare with direct-cut operation, baton handover has improved the service quality of system, compare with soft handover, the resource requirement of system equipment and subscriber equipment has been saved in baton handover.
As shown in Figure 1, Chang Gui Radio Link switching flow can be described as:
In aforesaid handoff procedure, the Target Wireless link issues after Radio Link sets up message at system equipment, promptly begins to send downstream signal at the target downlink Radio Link.At this moment, system equipment does not still send switching command at the source down wireless link, and subscriber equipment more can't be learned to be needed to prepare to switch.Like this, the signal itself that the Target Wireless link is sent promptly is the interference to other down wireless link, if source down wireless link and target downlink Radio Link overlap in frequency with on the time, the target downlink Radio Link the downstream signal that sends in advance more can the Radio Link handover success rate of subscriber equipment itself be exerted an influence.
Above-mentioned phenomenon shows more outstanding in the TD-SCDMA mobile communication system, especially when multi-user's co-frequency co-time slot switches.Therefore, need provide a kind of new Radio Link changing method will help the lifting of handover success rate, the service quality of elevator system simultaneously to the interference of source down wireless link to reduce the target downlink Radio Link.
Summary of the invention
At above deficiency, the technical problem to be solved in the present invention provides the Radio Link changing method in a kind of mobile communication system, can reduce the interference of network down direction in handoff procedure, and can improve handover success rate
In order to solve the problems of the technologies described above, the invention provides the Radio Link changing method in a kind of mobile communication system, it is characterized in that, comprising:
After A, system equipment decision are switched, set up the Target Wireless link, and issue the Radio Link switching command to subscriber equipment at the source down wireless link;
B, subscriber equipment send the signal that comprises particular sequence at target up-link wireless link after receiving the Radio Link switching command;
If C, system equipment arrive described particular sequence in target up-link wireless link detecting, then send the signal that comprises particular sequence at the target downlink Radio Link, subscriber equipment is after the target downlink Radio Link detects described particular sequence, on target up-link wireless link, send the message of handover success, before confirming that target up-link wireless link is received particular sequence, the target downlink Radio Link does not carry out the transmission of signal;
D, system equipment are received the handover success message that subscriber equipment is replied, and switching is finished.
Further, step C specifically comprises:
C1, system equipment judge whether to have received the particular sequence that subscriber equipment sends at target up-link wireless link, if then flow process changes step C2 over to, otherwise change step C3 over to;
C2, system equipment send the signal that comprises particular sequence on the target downlink Radio Link;
C3, subscriber equipment judge whether to have received at the target downlink Radio Link particular sequence of system equipment transmission, if, then showing the handshake procedure success, flow process changes step C6 over to, otherwise changes step C4 over to;
C4, subscriber equipment judge whether the particular sequence number of times that sends reaches maximum times, if, then showing the handshake procedure failure, flow process changes step C6 over to, otherwise changes step C5 over to;
C5, subscriber equipment is regulated the power that sends particular sequence in the predetermined mode of system, and sends the signal that comprises particular sequence again on target up-link wireless link, changes step C1 over to;
C6, the handshake procedure of end particular sequence; If the handshake procedure success, then subscriber equipment sends the message of handover success on target up-link wireless link.
Further, described particular sequence is any one in mode 31 and the mode 32:
31, the transformat combination indicated value is 0, and the Serial No. of modulating on physical channel is 0 and 1 repetitive sequence that replaces;
32, the transformat combination indicated value is a particular value, and the Serial No. of modulating on physical channel is that 10 milliseconds of message lengths in the Transmission Time Interval are 0, and the CRC bit is complete 0 coded sequence.
Further, for mode 31, whether when the detection of particular sequence, at first adjudicating the transformat combination indicated value is 0, judges then whether the Serial No. of modulating on the physical channel is 0 and 1 repetitive sequence that replaces, thereby whether judgement receives particular sequence;
For mode 32, when the detection of particular sequence, whether be described particular value, judge that then whether the Serial No. modulated on the physical channel is complete 0 coded sequence for the CRC bit, thereby whether judgement receives particular sequence if at first adjudicating the transformat combination indicated value.
Further, in the steps A: after system equipment was set up the Target Wireless link, target up-link wireless link remained on the uplink monitoring state.
Further, among the step C5: subscriber equipment according in the Radio Link switching command with the step-length of power control, particular sequence of every transmission, then the transmitted power of particular sequence increases the step-length of a power control.
Further, step C5 also comprises: subscriber equipment requires system equipment to strengthen the transmitting power of target downlink wireless link signals in the command word of descending power control.
Further, comprise before the steps A: user equipment to report triggers the measurement report of switch decision, and system equipment carries out switch decision, and the position of definite Target Wireless link.
Further, also comprise behind the step D: system equipment need to judge whether deletion source Radio Link, if then delete the source Radio Link.
Technical scheme of the present invention is because after target up-link wireless link was received the correct information of subscriber equipment, system equipment just began to send downstream signal at the target downlink Radio Link, thereby can reduce the interference of network at down direction; Meanwhile, subscriber equipment enters the flow process that uplink transmission power is adjusted, and up to after the target downlink Radio Link is received the correct information of system equipment, just changes over to and enters normal operation flow, thereby improve handover success rate, and reduce the interference of system.
Description of drawings
Fig. 1 is existing Radio Link switching flow schematic diagram;
Fig. 2 is the concrete implementing procedure figure of the Radio Link changing method in the mobile communication system of the present invention;
Fig. 3 is the concrete implementing procedure figure that the uplink transmission power of subscriber equipment in the switching flow of the present invention is adjusted.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
The present invention proposes the Radio Link changing method in a kind of mobile communication system, wherein the Radio Link switching comprises that the Radio Link switching of minizone and the Radio Link in the sub-district switch.
Main thought of the present invention is: after target up-link wireless link was received the correct information of subscriber equipment, system equipment just began to send downstream signal at the target downlink Radio Link, thereby reduces the interference of network at down direction; Meanwhile, subscriber equipment enters the flow process that uplink transmission power is adjusted, and up to after the target downlink Radio Link is received the correct information of system equipment, just changes over to and enters normal operation flow, thereby improve handover success rate, and reduce the interference of system.Here the correct information of receiving of indication mainly is meant the successful detection of particular sequence, also can be that the verification of CRC (CRC) is passed through.
This Radio Link changing method also can be disposed in conjunction with direct-cut operation, soft handover and baton handover etc., carries out in also can switching at the Radio Link of inside, same sub-district.In conjunction with shown in Figure 2, the flow process of the Radio Link changing method that the present invention proposes is as follows:
Send in the handshake procedure of particular sequence at subscriber equipment and system equipment, subscriber equipment can carry out the transmission of particular sequence according to flow process shown in Figure 3:
Step 37, subscriber equipment send the message of handover success at target up-link wireless link.
Further be illustrated with an application example of the present invention below
The Radio Link changing method that the present invention proposes can reduce the interference level of system; and Radio Link handover success rate that can elevator system; below will be according to the specific embodiment of the present invention; further describe the technical characterictic and the function characteristics of this invention; so that the present invention to be described better, but not to be used for limiting protection scope of the present invention.
The TD-SCDMA mobile communication system is in actual networking, frequency reuse can be 1, that is to say, adjacent sub-district can be a co-frequency cell, consider following scene: subscriber equipment switches to the same time slot of another sub-district from the time slot of a sub-district between homogeneous frequency adjacent area, if the signal of target downlink Radio Link sends according to existing Radio Link handoff technique and implements, then the target downlink Radio Link will directly interfere with the signal of source Radio Link, the probability that makes subscriber equipment successfully receive the Radio Link switching command reduces, and is especially obvious when multi-user's co-frequency co-time slot switches.
Use the Radio Link changing method that the present invention proposes, according to flow process shown in Figure 2, and the regulation particular sequence is in following two kinds of optional modes any one in system:
The transformat combination indicated value is 0, and the Serial No. of modulating on physical channel is the repetitive sequence of 010101...;
The transformat combination indicated value is a particular value, and the Serial No. of modulating on physical channel is that the message length in the 10ms Transmission Time Interval is 0, and the CRC bit is complete 0 coded sequence.
In actual applications, described particular sequence also can be other form of appointing.
For optional mode 1, whether when the detection of particular sequence, at first adjudicating the transformat combination indicated value is 0, judges then whether the Serial No. of modulating on the physical channel is the repetitive sequence of 010101..., thereby whether judgement receives particular sequence.
For optional mode 2, whether when the detection of particular sequence, at first adjudicating the transformat combination indicated value is particular value, judge that then whether the Serial No. modulated on the physical channel is complete 0 coded sequence for the CRC bit, thereby whether judgement receives particular sequence.
According to flow process shown in Figure 3, in the step 36, subscriber equipment can according in the Radio Link switching command with the step-length of power control, particular sequence of every transmission, then the transmitted power of particular sequence increases the step-length of a power control, can require system equipment to strengthen the transmitting power of target downlink wireless link signals in the command word of descending power control simultaneously.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (9)
1. the Radio Link changing method in the mobile communication system is characterized in that, comprising:
After A, system equipment decision are switched, set up the Target Wireless link, and issue the Radio Link switching command to subscriber equipment at the source down wireless link;
B, subscriber equipment send the signal that comprises particular sequence at target up-link wireless link after receiving the Radio Link switching command;
If C, system equipment arrive described particular sequence in target up-link wireless link detecting, then send the signal that comprises particular sequence at the target downlink Radio Link, subscriber equipment is after the target downlink Radio Link detects described particular sequence, on target up-link wireless link, send the message of handover success, before confirming that target up-link wireless link is received particular sequence, the target downlink Radio Link does not carry out the transmission of signal;
D, system equipment are received the handover success message that subscriber equipment is replied, and switching is finished.
2. Radio Link changing method as claimed in claim 1 is characterized in that step C specifically comprises:
C1, system equipment judge whether to have received the particular sequence that subscriber equipment sends at target up-link wireless link, if then flow process changes step C2 over to, otherwise change step C3 over to;
C2, system equipment send the signal that comprises particular sequence on the target downlink Radio Link;
C3, subscriber equipment judge whether to have received at the target downlink Radio Link particular sequence of system equipment transmission, if, then showing the handshake procedure success, flow process changes step C6 over to, otherwise changes step C4 over to;
C4, subscriber equipment judge whether the particular sequence number of times that sends reaches maximum times, if, then showing the handshake procedure failure, flow process changes step C6 over to, otherwise changes step C5 over to;
C5, subscriber equipment is regulated the power that sends particular sequence in the predetermined mode of system, and sends the signal that comprises particular sequence again on target up-link wireless link, changes step C1 over to;
C6, the handshake procedure of end particular sequence; If the handshake procedure success, then subscriber equipment sends the message of handover success on target up-link wireless link.
3. Radio Link changing method as claimed in claim 1 is characterized in that, described particular sequence is any one in mode 31 and the mode 32:
31, the transformat combination indicated value is 0, and the Serial No. of modulating on physical channel is 0 and 1 repetitive sequence that replaces;
32, the transformat combination indicated value is a particular value, and the Serial No. of modulating on physical channel is that 10 milliseconds of message lengths in the Transmission Time Interval are 0, and the CRC bit is complete 0 coded sequence.
4. Radio Link changing method as claimed in claim 3 is characterized in that:
For mode 31, whether when the detection of particular sequence, at first adjudicating the transformat combination indicated value is 0, judges then whether the Serial No. of modulating on the physical channel is 0 and 1 repetitive sequence that replaces, thereby whether judgement receives particular sequence;
For mode 32, when the detection of particular sequence, whether be described particular value, judge that then whether the Serial No. modulated on the physical channel is complete 0 coded sequence for the CRC bit, thereby whether judgement receives particular sequence if at first adjudicating the transformat combination indicated value.
5. Radio Link changing method as claimed in claim 1 is characterized in that, in the steps A: after system equipment was set up the Target Wireless link, target up-link wireless link remained on the uplink monitoring state.
6. Radio Link changing method as claimed in claim 2, it is characterized in that, among the step C5: subscriber equipment according in the Radio Link switching command with the step-length of power control, particular sequence of every transmission, then the transmitted power of particular sequence increases the step-length of a power control.
7. Radio Link changing method as claimed in claim 2 is characterized in that step C5 also comprises: subscriber equipment requires system equipment to strengthen the transmitting power of target downlink wireless link signals in the command word of descending power control.
8. Radio Link changing method as claimed in claim 1 is characterized in that, comprises before the steps A: user equipment to report triggers the measurement report of switch decision, and system equipment carries out switch decision, and the position of definite Target Wireless link.
9. Radio Link changing method as claimed in claim 1 is characterized in that, also comprises behind the step D: system equipment need to judge whether deletion source Radio Link, if then delete the source Radio Link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101615200A CN101128064B (en) | 2007-09-24 | 2007-09-24 | Wireless link switching method in wireless communication system |
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| CN2007101615200A CN101128064B (en) | 2007-09-24 | 2007-09-24 | Wireless link switching method in wireless communication system |
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| CN101128064A true CN101128064A (en) | 2008-02-20 |
| CN101128064B CN101128064B (en) | 2012-01-11 |
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| CN2007101615200A Active CN101128064B (en) | 2007-09-24 | 2007-09-24 | Wireless link switching method in wireless communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101999243A (en) * | 2009-12-17 | 2011-03-30 | 高通股份有限公司 | Method and apparatus used for clearing signaling for relay switching in TD-SCDMA system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6845095B2 (en) * | 2001-04-27 | 2005-01-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Efficient header handling involving GSM/EDGE radio access networks |
| CN100463560C (en) * | 2005-06-06 | 2009-02-18 | 上海原动力通信科技有限公司 | Cell switching method based on time-division duplex system |
| CN1941998A (en) * | 2005-09-29 | 2007-04-04 | 北京三星通信技术研究有限公司 | Access for controlling user terminal equipment in LTE system |
| CN100473209C (en) * | 2007-01-09 | 2009-03-25 | Ut斯达康通讯有限公司 | Method of TDD WCDMA system shared channel switch |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101999243A (en) * | 2009-12-17 | 2011-03-30 | 高通股份有限公司 | Method and apparatus used for clearing signaling for relay switching in TD-SCDMA system |
| US8885605B2 (en) | 2009-12-17 | 2014-11-11 | Qualcomm Incorporated | Method and apparatus for explicit signaling of baton handover in TD-SCDMA systems |
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