CN1445944A - Method for automatic switching between transmitting diversity and non-transmitting diversity - Google Patents
Method for automatic switching between transmitting diversity and non-transmitting diversity Download PDFInfo
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- CN1445944A CN1445944A CN02103747A CN02103747A CN1445944A CN 1445944 A CN1445944 A CN 1445944A CN 02103747 A CN02103747 A CN 02103747A CN 02103747 A CN02103747 A CN 02103747A CN 1445944 A CN1445944 A CN 1445944A
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Abstract
The present invention includes the following: The emitting diversity channel is monitored and emitted by an emitting channel state monitoring unit in the base station and the operation state is reported to the base station main control unit; if the operation state is abnormal, the main control unit sends this information to the emitting diversity control unit and switches the diversity mode into the nondiversity mode including switching between TSTD, and non-emitting diversity, switching between STTD, TxAA and non-emitting diversity as well as increasing emitting power to the sum of the two antenna channels in diversifying; and finally, the main control unit informs the emitting diversity control unit to switch back to the diversity mode, when the diversity channel is restored to nonmality.
Description
Technical field
The present invention relates to Wideband Code Division Multiple Access (WCDMA) (WCDMA) mobile communication technology field, relate to the transmit diversity in a kind of WCDMA mobile communication access system and the handoff technique of non-transmit diversity or rather.
Background technology
Diversity technique is a main anti-fading technology, can improve the transmission reliability under the multidiameter fading channel greatly, be widely used in particularly digital mobile communication of mobile communication system and the 3G (Third Generation) Moblie communication system, and be applied to send diversity from the receive diversity reciprocity.
The space diversity of making a start adopts two pairs of antennas exactly, and is separated by a distance, send respectively, receiving end to the two-way that receives mutually independently signal merge, thereby improve the quality of signal of communication.
In the broad band CDMA mobile communication connecting system, the down link from the base station to the portable terminal adopts the transmit diversity mode than adopting non-transmit diversity (single antenna) mode and can improve the performance of down link greatly under the situation that adopts the equal-wattage emission.The down transmission diversity of Release99 version support at present comprises time switched transmit diversity (TSTD), Space Time Coding transmit diversity (STTD) and three kinds of modes of array antenna Closed-Loop Transmit Diversity (TxAA).TSTD transmit diversity mode only is used for synchronizing channel, and STTD transmit diversity mode is used for common signal channel and dedicated channel, TxAA array antenna Closed-Loop Transmit Diversity mode are used for dedicated channel.
Referring to Fig. 1, synchronous channel structure shown in the figure is one 10 milliseconds (#0 to #14 is totally 15 time slots, 38400 chip lengths) synchronizing channel wireless frame structures.Synchronizing channel is used for the Cell searching of subscriber equipment (UE) when just starting shooting, and realizes time synchronized and scrambler code group identification between UE and base station, and synchronizing channel comprises primary synchronization channel and from synchronizing channel.
Primary synchronization channel is at each time slot emission primary modulation sign indicating number Cp, and the length of modulation code Cp is 256 chips, and the Primary Synchronisation Code of each sub-district is identical in the system.
The modulation code c that 15 sequences are arranged from one of synchronizing channel repeat its transmission
s I, k, each modulation code length is 256 chips, i is the sequence number of scrambler code character, i=0,1 ..., 63, k is a timeslot number, k=0,1,2 ..., 14, each Secondary Synchronization Code is to be a select sign indicating number 16 of the 256 chips different sign indicating numbers from length, represents in the sequence on synchronizing channel which code character the descending scrambler of sub-district belongs to.
Primary Synchronisation Code and Secondary Synchronization Code are modulated with symbol a, adopt the STTD coding on other channel if a=+1 is illustrated in, and do not adopt the STTD coding on other channel if a=-1 is illustrated in.
Transmit from synchronizing channel and primary synchronization channel are parallel.
Referring to Fig. 2, the situation when synchronizing channel shown in the figure does not adopt transmit diversity (non-transmit diversity) mode, primary synchronization channel and all send Primary Synchronisation Code aCp and Secondary Synchronization Code ac respectively at each time slot from synchronizing channel
s I, k
Referring to Fig. 3, the situation when synchronizing channel shown in the figure is supported TSTD transmit diversity mode, even number time slot #0, #2 ..., #14, Primary Synchronisation Code aCp and Secondary Synchronization Code ac
s I, kAll launch on antenna 1, antenna 2 cuts out (Tx OFF); And odd number time slot #1, #3 ..., #13, Primary Synchronisation Code aCp and Secondary Synchronization Code ac
s I, kAll launch on antenna 2, antenna 1 cuts out (Tx OFF), but the recipient will combine two paths of signals and could form a complete identification message.
Cell searching when synchronizing channel is used for subscriber equipment (UE) start is by time synchronized and the down link scrambler code group identification between search realization UE and base station.Specifically comprise: UE uses the Primary Synchronisation Code of synchronizing channel to obtain the slot synchronization of sub-district; UE uses the Secondary Synchronization Code of synchronizing channel to go for frame synchronization, and the scrambler code character of sub-district is discerned; UE after basic scrambler is identified, detects broadcast channel by on Common Pilot Channel all sign indicating numbers in the scrambler code character of identification being discerned basic scrambler by symbol is relevant, obtains the specific system broadcast information in sub-district.
For the equipment of supporting the transmit diversity function, be configured to support under the TSTD situation in synchronizing channel, if an antenna channels is damaged because of equipment fault, the synchronous channel signal of base station down emission just only exists on an antenna, UE is because of can not intactly receiving a synchronous code, Cell searching function when can influence UE just having started shooting can't realize sub-district code group identification and temporal frame synchronization, registers so can't enter network system at all.
Referring to Fig. 4, the two-way transmission block coding structure of the transmit diversity of STTD shown in figure mode.Space Time Coding transmit diversity (STTD) mode is used for common signal channel and dedicated channel, and array antenna Closed-Loop Transmit Diversity (TxAA) is used for dedicated channel.
Under STTD transmit diversity mode and TxAA transmit diversity mode, the content of two antenna emissions is identical, the channel bit b when being example in STTD transmit diversity mode as shown in FIG.
0, b
1, b
2, b
3, be the order difference of their transmission content, the order of transmission content on the antenna 1 (STTD coded-bit) is b
0, b
1, b
2, b
3, and the order of transmission content (STTD coded-bit) is b on the antenna 2
2, b
3, b
0, b
1
Though the recipient can be by the effective information that will transmit on one road signal acquisition respective channels, but because under the diversity mode situation, two antenna transmitting power sums equal not adopt the transmitting power of individual antenna under the diversity emission situation, if a passage damages, the power that does not damage signal on the passage transmitting antenna will be half of system requirements, obviously the signal strength signal intensity correctly demodulation of recipient by launching on the antenna is in user's communications performance rapid deterioration under the communications status thereby make.
In sum, be configured to support under the situation of TSTD (transmit diversity that the time switches) mode in synchronizing channel, because the information of each passage emission is the part of whole information, the information combination of each passage need be got up to form complete information, when an antenna channels is damaged, have the problem that UE can not a synchronous code of complete reception, communication can not normally be carried out; Be configured to support under the situation of STTD (Space Time Coding transmit diversity), TxAA (the array Closed-Loop Transmit Diversity of many antennas) mode in Common Pilot Channel, dedicated channel, identical and the order difference of content of the content of two antenna channels emission, when an antenna channels is damaged, there is the not enough problem of transmission power intensity.
For solving the problem of above-mentioned two aspects, present standard code and implementation are in the base station transmission channel state to be monitored, and abnormal conditions are reported resource management center, and adopt the alarm mode to notify the attendant, revise configuration by manual type again and safeguard.On the one hand the attendant can not one waits until at the monitoring scene; On the other hand, slave unit breaks down to fix a breakdown generally need have the long period, and during this period of time the user of new start can't realize Cell searching, thereby can not network, and can not communicate by letter.So need equipment to have auto-conversion function, promptly when abnormality occurring, switch to the non diversity send mode from the diversity transmission mode automatically, can operate as normal with the assurance system.
Summary of the invention
The objective of the invention is to design the automatic switching method of a kind of transmit diversity and non-transmit diversity, directly in the base station, realize the automatic switching function of transmit diversity and non-transmit diversity mode, thereby the assurance system can normally move under the situation that an antenna channels breaks down, and guarantees communication quality.
The technical scheme that realizes the object of the invention is such: the automatic switching method of a kind of transmit diversity and non-transmit diversity is characterized in that comprising following treatment step:
A. the transmission channel Condition Monitoring Unit of base station is monitored the operating state of transmit diversity passage, and the operating state of transmit diversity passage is reported to the base station main control unit;
B. when the operating state of arbitrary transmit diversity passage when being unusual, the base station main control unit is with abnormality information notice transmit diversity control unit;
C. the transmit diversity control unit switches to the non diversity mode with the operating state of transmit diversity passage from diversity mode;
D. in the operating state of transmit diversity passage from abnormal restoring for just often, base station main control unit notice transmit diversity control unit switches to diversity mode with the operating state of transmit diversity passage from the non diversity mode by the transmit diversity control unit.
In the described steps A, described transmission channel Condition Monitoring Unit is monitored the operating state of two transmission diversity antennas, and the operating state of two transmission diversity antennas passages is reported to the base station main control unit.
Among the described step B, the base station main control unit also reports abnormality information the network management system alarm simultaneously.
Among the described step C, be directly synchronizing channel to be switched to the non diversity mode from adopting time switched transmit diversity (TSTD) mode, only on a normal paths, send.
Among the described step C, for common signal channel that is in user under the communications status and dedicated channel, from adopting Space Time Coding transmit diversity (STTD) mode or array antenna Closed-Loop Transmit Diversity (TxAA) mode to switch to the non diversity mode, only on a normal paths, send.
Described from adopting Space Time Coding transmit diversity (STTD) mode or array antenna Closed-Loop Transmit Diversity (TxAA) mode to switch to the non diversity mode, further comprise:
When antenna 1 channel abnormal, with antenna 2 passages as antenna 1 passage, with respective channels emission data on antenna 2 passages are switched to this antenna 1 passage in proper order, antenna 1 passage and antenna 2 passage transmitting power sums when simultaneously the transmitting power of respective channels on antenna 2 passages being increased to the transmit diversity mode;
When antenna 2 channel abnormals, antenna 1 passage and antenna 2 passage transmitting power sums when the transmitting power of respective channels on antenna 1 passage is increased to the transmit diversity mode.
The inventive method is applied in the WCDMA mobile communication system, by the normal or abnormal work state of monitoring base station downlink channel unit, supports the automatic switching function of transmit diversity state and non-transmit diversity state.When abnormal conditions appear in the transmit diversity passage, except that carrying out alarm report, also allow the base station main control unit and the transmit diversity control unit of inside of base station directly the TSTD transmit diversity mode of synchronizing channel be switched to the non diversity mode, promptly switch to mode shown in Figure 2, on the normal path of device channels, send from mode shown in Figure 3; To being in common signal channel and the dedicated channel among the communications status user, from the transmit diversity state exchange to the non diversity state, specifically comprise: when antenna 2 passages damage, two antenna transmitting power sums when the transmitting power of respective channels on antenna 1 passage is increased to diversity mode; When antenna 1 passage damages, with antenna 2 passages as antenna 1 passage, to switch to antenna 1 passage of this moment from the data of the respective channels of antenna 2 passages emission in proper order, two antenna transmitting power sums when also the transmitting power of respective channels being increased to diversity mode simultaneously.
When the equipment working state monitoring means of the downlink passage of base station monitors transmission channel when abnormal conditions return to normal condition, base station main control unit and transmit diversity control unit switch to the transmit diversity mode with various channels transmit patterns from the non diversity mode.
The base station down transmission channel that the present invention monitored comprises: spread spectrum and modulation function module, intermediate-frequency channel, linear power amplifier, duplexer, tower are put and antenna part.
Description of drawings
Fig. 1 is the synchronous channel structure schematic diagram;
Fig. 2 is the non-transmit diversity mode of a synchronizing channel schematic diagram;
Fig. 3 is that synchronizing channel is supported TSTD transmit diversity mode schematic diagram;
Fig. 4 is the two-way transmission block coding method schematic diagram of STTD transmit diversity mode;
Fig. 5 is the embodiment of the present invention schematic flow sheet.
Embodiment
Referring to Fig. 5, implement the present invention program's schematic flow shown in the figure, the transmission channel Condition Monitoring Unit of base station is monitored the operating state of two transmission diversity antennas-antennas 1 and antenna 2, as long as abnormal conditions appear in the transmission diversity antennas of one of them, then directly by base stations control, the diversity emission is automatically switched to the non diversity emission, and processing procedure comprises the steps:
The transmission channel Condition Monitoring Unit of inside of base station is monitored the operating state of two transmission diversity antennas, and the working condition of two transmit diversity passages is reported to the base station main control unit;
When abnormal conditions appearred in any one transmission diversity antennas, the base station main control unit was with corresponding state information notice transmit diversity control unit;
The information that sends on two transmit diversity passages of transmit diversity control unit control, make on normal transmission diversity antenna passage and send, for the channel of STTD and TxAA transmit diversity passage, with its transmitting power increase to two transmission diversity antennas transmitting powers and;
The base station main control unit reports network management (webmaster) ALM with abnormality information simultaneously, so that repaired.
The method that a kind of down transmission diversity of being supported by the base station of the present invention and non-transmit diversity automatically switch, the realization of base stations control down transmission diversity function according to diversity closed-circuit working state normally and abnormal conditions switch automatically.
Comprise: the time switched transmit diversity (TSTD) of synchronizing channel is to the automatic switchover of non diversity emission function, and information sends from a normal paths;
Be used for the automatic switchover of the Space Time Coding transmit diversity (STTD) of common signal channel to non-transmit diversity emission function, information order on single transmitting antenna sends two antenna channels sums when transmitting power is increased to diversity;
The Space Time Coding transmit diversity (STTD) and the automatic switchover of array antenna Closed-Loop Transmit Diversity (TxAA) that are used for dedicated channel to the non diversity function, information order on single transmitting antenna sends, two antenna channels sums when transmitting power is increased to the diversity emission;
After the transmit diversity routing restoration was normal, base station main control unit and transmit diversity control unit supported various channels to automatically switch to corresponding diversity transmitting formula again from the non diversity radiation pattern.
Method of the present invention not only can be used for diversity mode in the WCDMA system, also is equally applicable to the system that other adopts the transmit diversity function.
Claims (7)
1. the automatic switching method of a transmit diversity and non-transmit diversity is characterized in that comprising following treatment step:
A. the transmission channel Condition Monitoring Unit of base station is monitored the operating state of transmit diversity passage, and the operating state of transmit diversity passage is reported to the base station main control unit;
B. when the operating state of arbitrary transmit diversity passage when being unusual, the base station main control unit is with abnormality information notice transmit diversity control unit;
C. the transmit diversity control unit switches to the non diversity mode with the operating state of transmit diversity passage from diversity mode;
D. in the operating state of transmit diversity passage from abnormal restoring for just often, base station main control unit notice transmit diversity control unit switches to diversity mode with the operating state of transmit diversity passage from the non diversity mode by the transmit diversity control unit.
2. the automatic switching method of a kind of transmit diversity according to claim 1 and non-transmit diversity, it is characterized in that: in the described steps A, described transmission channel Condition Monitoring Unit is monitored the operating state of two transmission diversity antennas, and the operating state of two transmission diversity antennas passages is reported to the base station main control unit.
3. the automatic switching method of a kind of transmit diversity according to claim 1 and non-transmit diversity is characterized in that: described transmit diversity passage comprises that spread spectrum and modulation function module, intermediate-frequency channel, linear power amplifier, duplexer, tower put and antenna part.
4. the automatic switching method of a kind of transmit diversity according to claim 1 and non-transmit diversity is characterized in that: among the described step B, the base station main control unit also reports abnormality information the network management system alarm simultaneously.
5. the automatic switching method of a kind of transmit diversity according to claim 1 and non-transmit diversity, it is characterized in that: among the described step C, be directly synchronizing channel to be switched to the non diversity mode from adopting time switched transmit diversity (TSTD) mode, only on a normal paths, send.
6. the automatic switching method of a kind of transmit diversity according to claim 1 and non-transmit diversity, it is characterized in that: among the described step C, for common signal channel that is in user under the communications status and dedicated channel, from adopting Space Time Coding transmit diversity (STTD) mode or array antenna Closed-Loop Transmit Diversity (TxAA) mode to switch to the non diversity mode, only on a normal paths, send.
7. the automatic switching method of a kind of transmit diversity according to claim 6 and non-transmit diversity, it is characterized in that: described from adopting Space Time Coding transmit diversity (STTD) mode or array antenna Closed-Loop Transmit Diversity (TxAA) mode to switch to the non diversity mode, further comprise:
When antenna 1 channel abnormal, with antenna 2 passages as antenna 1 passage, with respective channels emission data on antenna 2 passages are switched to this antenna 1 passage in proper order, antenna 1 passage and antenna 2 passage transmitting power sums when simultaneously the transmitting power of respective channels on antenna 2 passages being increased to the transmit diversity mode;
When antenna 2 channel abnormals, antenna 1 passage and antenna 2 passage transmitting power sums when the transmitting power of respective channels on antenna 1 passage is increased to the transmit diversity mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021037477A CN1184761C (en) | 2002-03-18 | 2002-03-18 | Method for automatic switching between transmitting diversity and non-transmitting diversity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021037477A CN1184761C (en) | 2002-03-18 | 2002-03-18 | Method for automatic switching between transmitting diversity and non-transmitting diversity |
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| CN1445944A true CN1445944A (en) | 2003-10-01 |
| CN1184761C CN1184761C (en) | 2005-01-12 |
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| CNB021037477A Expired - Fee Related CN1184761C (en) | 2002-03-18 | 2002-03-18 | Method for automatic switching between transmitting diversity and non-transmitting diversity |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352297C (en) * | 2004-11-18 | 2007-11-28 | 中兴通讯股份有限公司 | Personnel hand-held phone system base station and power controlling method |
| CN100413378C (en) * | 2006-03-29 | 2008-08-20 | 华为技术有限公司 | A method to reduce the interruption of terminal service in the course of packet switching at the mobile communication |
| WO2010097030A1 (en) * | 2009-02-26 | 2010-09-02 | 华为技术有限公司 | Method, device and indication for switching of cell diversity mode |
| WO2012155545A1 (en) * | 2011-08-18 | 2012-11-22 | 中兴通讯股份有限公司 | Method and system for controlling uplink closed loop transmit diversity |
| CN101425829B (en) * | 2007-11-02 | 2013-09-18 | 日本电气株式会社 | Wireless diversity reception apparatus and reception method |
| CN101742739B (en) * | 2009-12-23 | 2014-08-13 | 中兴通讯股份有限公司 | Base station communication method, device and system |
| CN112189378A (en) * | 2019-01-21 | 2021-01-05 | 华为技术有限公司 | Vehicle-mounted antenna system and communication method applied to same |
-
2002
- 2002-03-18 CN CNB021037477A patent/CN1184761C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352297C (en) * | 2004-11-18 | 2007-11-28 | 中兴通讯股份有限公司 | Personnel hand-held phone system base station and power controlling method |
| CN100413378C (en) * | 2006-03-29 | 2008-08-20 | 华为技术有限公司 | A method to reduce the interruption of terminal service in the course of packet switching at the mobile communication |
| CN101425829B (en) * | 2007-11-02 | 2013-09-18 | 日本电气株式会社 | Wireless diversity reception apparatus and reception method |
| WO2010097030A1 (en) * | 2009-02-26 | 2010-09-02 | 华为技术有限公司 | Method, device and indication for switching of cell diversity mode |
| CN101742739B (en) * | 2009-12-23 | 2014-08-13 | 中兴通讯股份有限公司 | Base station communication method, device and system |
| WO2012155545A1 (en) * | 2011-08-18 | 2012-11-22 | 中兴通讯股份有限公司 | Method and system for controlling uplink closed loop transmit diversity |
| CN102958143A (en) * | 2011-08-18 | 2013-03-06 | 中兴通讯股份有限公司 | Method and system for controlling uplink closed transmit diversity |
| CN112189378A (en) * | 2019-01-21 | 2021-01-05 | 华为技术有限公司 | Vehicle-mounted antenna system and communication method applied to same |
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|---|---|
| CN1184761C (en) | 2005-01-12 |
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