CN1180559C - 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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- CN1180559C CN1180559C CNB021037485A CN02103748A CN1180559C CN 1180559 C CN1180559 C CN 1180559C CN B021037485 A CNB021037485 A CN B021037485A CN 02103748 A CN02103748 A CN 02103748A CN 1180559 C CN1180559 C CN 1180559C
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Abstract
The present invention relates to a method for realizing the automatic switching between transmission diversity and non-transmission diversity by a command mode according to the working state of a transmission diversity channel in a mobile communication access system of a wide band code division multiple access (WCDMA) when a down transmission diversity function is supported by a base station, which comprises the steps: the working state of a transmission diversity channel is monitored by a base station system; the instruction that the transmission diversity channel is damaged is reported to a base station controller by a base station device through a resource state instruction message; after the resource state instruction message which can not be supported by a transmission diversity state is received by the base station controller, a reconfiguration request message of a small zone is immediately launched to a base station, and the content that a corresponding channel supports a transmission diversity mode is cancelled in the reconfiguration request message. A channel in the small zone is switched from a transmission diversity mode to a non-transmission diversity mode by the base station according to the reconfiguration request message. When the working state of the transmission diversity channel is recovered to be normal, the base station controller informs a diversity switching control unit of the base station to switch the non-transmission diversity mode into the transmission diversity mode.
Description
Technical field
The present invention relates to Wideband Code Division Multiple Access (WCDMA) (WCDMA) mobile communication technology field, relate to the down transmission 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 3-G (Generation Three mobile 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 transmit diversity than adopting non-transmit diversity (single antenna) 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 (length is 2560 chips) 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 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, situation when synchronizing channel shown in the figure is supported TSTD transmit diversity mode, the characteristics of this kind transmit diversity are that the two-way time segment of transmit diversity sends, as shown in FIG. 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.
Synchronizing channel is used for the Cell searching of subscriber equipment (UE) when just starting shooting, 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 in the time of can influencing the UE start can't realize sub-district code group identification and temporal frame synchronization, so can't enter the network system registration 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 by the transmission channel state detection unit transmission channel state to be monitored in the base station, and abnormal conditions are reported resource management center, 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 needs 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 a kind of method that realizes that transmit diversity and non-transmit diversity automatically switch, in the presence of base station and base station controller, realize the automatic switching function of transmit diversity and non-transmit diversity mode by signaling method, 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: a kind of method that realizes that transmit diversity and non-transmit diversity automatically switch 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;
B. when the operating state of arbitrary transmit diversity passage when being unusual, the base station is with abnormality information reporting base station controller;
C. base station controller is initiated cell re-configuration to the base station and is put request message, puts in the request message at this cell re-configuration, will remove the content of the various transmit diversity modes of the support of each channel configuration;
D. the diversity switch control unit of base station is put request message according to this cell re-configuration, and the channel in the sub-district is switched to non-transmit diversity mode from the transmit diversity mode;
E. in the operating state of transmit diversity passage from abnormal restoring for just often, the diversity switch control unit of base station controller informing base station switches to the transmit diversity mode with the operating state of transmit diversity passage from non-transmit diversity mode.
Method of the present invention requires base station and base station controller to automatically switch according to the operating state realization transmit diversity and the non-transmit diversity mode of transmission channel, to guarantee the normal stable operation of communication system.
Method of the present invention requires the base station that the working properly and abnormality of a plurality of passages of transmit diversity is monitored;
Method of the present invention requires the base station that the operation irregularity state of a plurality of passages of transmit diversity is reported the base station controller of higher level by the resource status Indication message, starts immediately for base station controller and reshuffles embodiment;
Method of the present invention requires base station controller to initiate cell re-configuration immediately after receiving abnormality message and puts request, revises the passage corresponding district transmit diversity functional configuration scheme of having damaged;
Method of the present invention is in the user under the communications status before requiring to reshuffle, can keep normal work after reshuffling.
A kind of method of supporting that down transmission diversity and non-transmit diversity automatically switch of the present invention, the descending transmit diversity function that whether adopts cooperates realization by the base station with base station controller, automatically switch according to diversity closed-circuit working state status.
Base station equipment reports the transmit diversity function not support indication by the resource status Indication message to base station controller;
Base station controller receives the transmit diversity state after the support resource state indication, and base station controller is initiated cell re-configuration to the base station immediately and put request message, and puts in the message at this cell re-configuration, removes the configuration of each channel being supported diversity mode;
The base station is converted to non-diversity mode with each channels transmit mode from diversity mode according to new configuration messages;
Comprise: the TSTD transmit diversity hand-off process that the base station is supported for synchronizing channel; The base station is for the hand-off process of STTD and TxAA transmit diversity;
After the operation irregularity state of transmit diversity passage transferred to normally, system's support automatically switched to diversity mode from non-diversity mode.
Method of the present invention, base station system to the various piece of transmitting antenna equipment particularly the operating state of transmit diversity passage monitor, when abnormal state takes place, alarm except adopting normal mode, so that notify outside attendant's on-call maintenance transmitting antenna equipment, the message that also requires base station equipment to report the transmit diversity function not support to base station controller by the resource status Indication message, after base station controller receives the resource status indication that the transmit diversity state can not support, base station controller is initiated cell re-configuration to the base station immediately and is put request message, and put in the message at this cell re-configuration, remove support diversity mode to each channel configuration, the base station is according to new configuration messages, control each channels transmit mode by the diversity switch control unit, be converted to non-diversity mode from diversity mode.The network equipment is realized the automatic switchover between transmit diversity mode and non-transmit diversity mode, thereby the assurance system can normally move.
Among the present invention program, monitor the working properly and abnormality of a plurality of passages of employing transmit diversity the base station.The base station down transmission channel comprises: parts such as spread spectrum and modulation function module, intermediate-frequency channel, linear power amplifier, duplexer, tower are put, antenna, the transmission channel state detection unit of base station equipment inside is monitored the downlink channel status.
Monitor the operating state of a plurality of passages of transmit diversity the base station, when abnormality occurring, by the interface Iub interface between base station and the base station controller, utilize the indication of message resource status to give base station controller with information reporting, bypass passage of indication transmit diversity damages, the transmit diversity function can not support that base station controller starts the scheme of reshuffling immediately.
Base station controller receives after the transmit diversity function can not support indication, initiates cell re-configuration immediately and puts request, comprises mainly in the reconfiguration message that the various transmit diversities indication with the channel abnormal respective cell is changed to deactivated state.
The user who is in before reshuffling in the communications status can keep normal operating conditions, as when antenna 1 channel failure, system can be mixed with downlink not diversity, antenna 1 channel signal switched on antenna 2 passages launch, what guarantee to send on the normal passage is the signal that antenna 1 should send, the power that transmits simultaneously increase to two transmitting antennas should transmitting power summation, thereby the robustness of enhanced system.
Description of drawings
Fig. 1 is one 10 milliseconds synchronizing channel wireless frame structure schematic diagrames;
Fig. 2 is the non-transmit diversity mode of a synchronizing channel structural representation;
Fig. 3 is that synchronizing channel is supported time switched transmit diversity mode (TSTD) structural representation;
Fig. 4 is the two-way transmission block coding structure schematic diagram of Space Time Coding transmit diversity mode (STTD);
Fig. 5 is the schematic flow sheet that the inventive method is implemented transmit diversity and non-transmit diversity function.
Embodiment
Referring to Fig. 5, implement the flow process of the inventive method shown in the figure.The transmission channel state detection unit of base station detects the transmission channel state of two transmission diversity antennas-antennas 1 with antenna 2, if after the abnormal work situation, carry out the automatic switchover of transmit diversity and non-transmit diversity, processing procedure comprises the steps:
When abnormal conditions appear in the corresponding transmission channel of any antenna, base station equipment is by the Iub interface between base station and the base station controller, utilize the resource status Indication message, report base station controller, the message that this resource status Indication message reports respective channel transmit diversity function not support to base station controller;
After base station controller receives the resource status Indication message that the transmit diversity function of respective channel can not support, base station controller is initiated cell re-configuration to the base station immediately and is put request message, put in the request message at this cell re-configuration, remove content the various diversity modes of support of each channel configuration;
The base station is according to new channel configuration message, by the diversity switch control unit each channels transmit mode of cell configuration is converted to non-diversity mode from diversity mode, and returns response message to base station controller;
After cell re-configuration was set to merit, base station controller was initiated the common signal channel reconfiguration request message to the base station, and the base station is converted to non-diversity mode with the common signal channel radiation pattern from diversity mode by the diversity switch control unit according to new configuration messages;
The base station will support the channel of transmit diversity to be converted to non-diversity mode from diversity mode to just being in the corresponding dedicated channel of the subscriber equipment (UE) of communications status by the diversity switch control unit;
Also alarm the abnormal work state information report base station to network management system simultaneously, so that the attendant keeps in repair;
After the transmit diversity routing restoration normal operating conditions of abnormal work state occurring,, the non diversity emission of channel is automatically switched to the diversity emission again by base station controller control and the diversity switch control unit by the base station.
Method of the present invention not only can be applicable in the WCDMA mobile communication access system, also adopts the system of transmit diversity function applicable to other.
Claims (9)
1. method that realizes that transmit diversity and non-transmit diversity automatically switch 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;
B. when the operating state of arbitrary transmit diversity passage when being unusual, the base station is with abnormality information reporting base station controller;
C. base station controller is initiated cell re-configuration to the base station and is put request message, puts in the request message at this cell re-configuration, will remove the content of the various transmit diversity modes of the support of each channel configuration;
D. the diversity switch control unit of base station is put request message according to this cell re-configuration, and the channel in the sub-district is switched to non-transmit diversity mode from the transmit diversity mode;
E. in the operating state of transmit diversity passage from abnormal restoring for just often, the diversity switch control unit of base station controller informing base station switches to the transmit diversity mode with the operating state of transmit diversity passage from non-transmit diversity mode.
2. a kind of method that realizes that transmit diversity and non-transmit diversity automatically switch according to claim 1, it is characterized in that: in the described steps A, described transmission channel Condition Monitoring Unit detects antenna 1 operating state with 2 two transmission diversity antennas of antenna, and the operating state of two transmission diversity antennas passages is reported to the base station.
3. a kind of method that realizes that transmit diversity and non-transmit diversity automatically switch according to claim 1 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. a kind of method that realizes that transmit diversity and non-transmit diversity automatically switch according to claim 1, it is characterized in that: among the described step B, the base station utilizes the resource status Indication message with described abnormality information reporting base station controller by the Iub interface between base station and the base station controller.
5. a kind of method that realizes that transmit diversity and non-transmit diversity automatically switch according to claim 1 is characterized in that: among the described step B, the base station also reports described abnormality information the network management system alarm simultaneously.
6. a kind of method that realizes that transmit diversity and non-transmit diversity automatically switch according to claim 1, it is characterized in that: among the described step C, put in the request message at cell re-configuration, to remove the content of the various transmit diversity modes of the support of each channel configuration, be the various transmit diversities of the unusual respective cell of diversity transmission channel to be indicated be changed to deactivated state.
7. a kind of method that realizes that transmit diversity and non-transmit diversity automatically switch according to claim 1 is characterized in that described step D further comprises:
D1. message is put according to cell re-configuration in the base station, each channels transmit mode of cell configuration is converted to non-diversity mode from diversity mode, and returns response message to base station controller;
D2. base station controller is initiated the common signal channel reconfiguration request message to the base station, and the base station is converted to non-diversity mode with the common signal channel radiation pattern from diversity mode according to this common signal channel reconfiguration message;
D3. the base station will support that to just being in the dedicated channel in the user equipment (UE) correspondence of communications status the channel of transmit diversity is converted to non-diversity mode from diversity mode.
8. a kind of method that realizes that transmit diversity and non-transmit diversity automatically switch according to claim 7 is characterized in that: described step D1 is for the transmit diversity of the time switched transmit diversity TSTD of synchronizing channel support and the automatic switchover of non-transmit diversity; Described step D2 is for the transmit diversity of the Space Time Coding transmit diversity STTD of common signal channel support and the automatic switchover of non-transmit diversity; Described step D3 is for the transmit diversity of the array antenna Closed-Loop Transmit Diversity TxAA of dedicated channel support and the automatic switchover of non-transmit diversity.
9. a kind of method that realizes that transmit diversity and non-transmit diversity automatically switch according to claim 1 and 2, it is characterized in that among the described step D, channel in the sub-district is switched to non-transmit diversity mode from the transmit diversity mode further to be comprised: when antenna 1 or antenna 2 channel abnormals, the downlink mode of base station is configured to non-transmit diversity mode, antenna 1 or antenna 2 channel signals are switched on antenna 2 or antenna 1 passage launch, simultaneously the power of antenna 2 or antenna 1 channel transmit signal is increased to the summation that primary antenna 1 and 2 two transmitting antennas of antenna should transmitting powers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021037485A CN1180559C (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 |
|---|---|---|---|
| CNB021037485A CN1180559C (en) | 2002-03-18 | 2002-03-18 | Method for automatic switching between transmitting diversity and non-transmitting diversity |
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| CN1180559C true CN1180559C (en) | 2004-12-15 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100361547C (en) * | 2004-12-23 | 2008-01-09 | 华为技术有限公司 | Method for treating failure of physical subzone pointed to local subsones of base station |
| CN101686070B (en) * | 2008-09-28 | 2013-10-09 | 华为技术有限公司 | Method and network equipment for reconfiguring logical antenna |
| CN101820659A (en) * | 2009-02-26 | 2010-09-01 | 华为技术有限公司 | District diversity mode switching indication and district diversity mode switching method and device |
| CN101583195B (en) * | 2009-06-12 | 2012-04-25 | 华为技术有限公司 | Data transmitting method, device and system |
| CN101958740B (en) * | 2010-09-21 | 2012-10-31 | 山东大学 | Four-antenna closed-loop transmitting diversity method for mobile communication system |
| WO2012083668A1 (en) * | 2011-06-28 | 2012-06-28 | 华为技术有限公司 | Monitoring system, device and method for distributed antenna system |
| EP3291469A4 (en) | 2015-05-14 | 2018-05-23 | Huawei Technologies Co., Ltd. | Ue, network node and method for determining transmission mode of downlink signal of cell |
| WO2020150857A1 (en) * | 2019-01-21 | 2020-07-30 | 华为技术有限公司 | Vehicle-mounted antenna system and communication method used for the vehicle-mounted antenna system |
| CN112422237A (en) * | 2020-11-24 | 2021-02-26 | 吴秀峰 | Wireless signal communication system and method based on one sending end and multiple receiving ends |
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