CN100536360C - A multi-cell joint detection method of the broadcast channel in the time-division duplex system - Google Patents
A multi-cell joint detection method of the broadcast channel in the time-division duplex system Download PDFInfo
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- CN100536360C CN100536360C CNB2006100728940A CN200610072894A CN100536360C CN 100536360 C CN100536360 C CN 100536360C CN B2006100728940 A CNB2006100728940 A CN B2006100728940A CN 200610072894 A CN200610072894 A CN 200610072894A CN 100536360 C CN100536360 C CN 100536360C
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Abstract
The present invention relates to a combination detecting method of the multi-cell of the broadcasting channel in the time division duplex system. The present invention includes the steps as follows to solve the problem of TSO time slot BCH channel interference among the cells: the main public control physics channel of the adjacent cells is estimated by the mobile terminal through the parameters corresponding to the parameter index from cell to cell, and the matched filtering is also performed; the result of the matched filtering is output to a combination detector in parallel; a combination detecting of the cells is performed in the combination detector and the main public control physics channel signals of the present cell are output. The good effect of the present invention resides in that: the interference occurring in the adjacent cells of TSO can be reduced effectively, and the degree of algorithm complexity will not increased by using common combination detecting device, and the power is saved, and the electromagnetic wave coverage of the system is enlarged.
Description
Technical field
The present invention relates to communication network field, particularly third generation wireless communication field is to the multi-cell joint detection method of broadcast channel concretely in a kind of tdd systems.
Background technology
The Chinese implication of TD-SCDMA is that TD SDMA inserts, this communication technology also belongs to a kind of technical standard of radio communication, it is to be proposed for the first time and worked with international partners on the basis of this Radio Transmission Technology (RTT) by China, finished the TD-SCDMA standard, become a member of CDMA TDD mode (CDMA TDD) standard, this is an invention of China Mobile circle, also is the contribution of China to the 3G (Third Generation) Moblie development.With the competition of Europe, the 3G standard that proposes separately of the U.S. in, the TD-SCDMA that China proposes formally becomes one of global 3G standard, this indicates that China has entered row advanced in the world at moving communicating field.
TD-SCDMA has adopted state-of-the-art technologies such as smart antenna, joint-detection, dynamic channel allocation, baton handover and software radio, is a FA 3G system.3G network can independently be set up fully in the TD-SCDMA system, and satisfy fully International Telecommunication Union and third generation partner program (3GPP) to covering, coexistence of systems, the support high-speed mobile of 3G system, the requirement of aspects such as high data rate is provided.By adopting new and improved technology, TD-SCDMA ability in these areas can be further improved.
The factor that influences a mobile communication system networking capability comprises the antijamming capability of system, switching, covering power, to support of high mobility and high data rate etc.Cdma system is an interference-limited system, but the TD-SCDMA system has adopted interference such as smart antenna, associated detection technique, uplink synchronous and dynamic channel allocation to suppress and hidden technology, and interference is weakened greatly to the influence of TDSCDMA systematic function.
When time division duplex has above-mentioned advantage, the mode of time division duplex also produces some distinctive requirements for TD-SCDMA LCR system, for example can not interfere with each other in order to make between the uplink and downlink link in the sub-district, the bi-directional synchronization of uplink and downlink link is set up in requirement in the sub-district: after user terminal start, user terminal by detect descending synchronous signal channel in the descending pilot frequency time slot and determine the sub-district at its place and set up with its place cell base station between down link synchronous; Then, user terminal is estimated transmitted power that uplink synchronous channel is required and transmitting time roughly by its descending synchronous signal channel that receives, in uplink pilot time slot, send uplink synchronous channel to the base station, the base station is detected uplink synchronous channel and is generated adjustment instruction to the user terminal transmitting time in uplink pilot time slot, thus user terminal according to the instruction of base station adjust set up and the base station between uplink synchronisation.Again for example,, require the synchronization among base stations work of each sub-district for can the phase mutual interference between the uplink and downlink link that makes the minizone, between each cell base station can pass through synchronously global positioning system (GPS) or similarly system realize.
For can the phase mutual interference between the uplink and downlink link between the system of the different radio operator that makes asynchronous work, appropriate authorities are the different frequency range of the system assignment of different radio operator, belong to the base station of each cellular carrier system and user terminal by filtering out the wireless signal that comes from other cellular carrier systems with its filter that distributes frequency range to be complementary.Ideally, under the TD-SCDMA system, the signal of each cellular carrier system should be separated fully mutually by the filter in base station and the user terminal, makes each other and does not disturb mutually.Yet in actual conditions, consider the restriction that realizes cost, the filtering characteristic of base station and user terminal median filter can not reach the requirement of desirable filtering, thereby interference can not be separated and then produce to the signal of successive bands cellular carrier system ideally fully.
In the Frequency Division Duplexing (FDD) (FDD) and time division duplex (TDD) system of universal mobile telecommunications system (UMTS), broadcast channel (Broadcast channel) is a kind of descending transmission channel, be used for sending the customizing messages that universal terrestrial radio inserts (UTRA) network or a certain given sub-district, generally be loaded with cell system parameter or core network domain descriptive information.The BCH channel is carried by Primary Common Control Physical Channel (P-CCPCH:Primary Common Control Physical Channel), especially for 1.28McpsUMTS TDD system, for example low spreading rate TDD (LCR TDD), the physical channel of (beacon-wise) feature that P-CCPCH is defined as having beacon channel, the spreading factor that has that only appears at time slot TS0 is in preceding two channel codes (channelization code) of 16, and concrete LCR tdd frame structure has a detailed description in 3GPP TS 25.221.
Except the time slot TS1-TS6 Traffic Channel time slot TS0, the interference of minizone can be reduced by some advanced technology, such as passing through smart antenna (SA), dynamic channel allocation technology such as (DCA).But the BCH channel can't use above-mentioned technology to reduce the interference of minizone in TS0, makes the area coverage of BCH channel reduce.To such an extent as to the coverage of BCH channel even less than Traffic Channel (TCH), particularly multicarrier in Node B in some cases, output signal is shared by a plurality of carrier waves, and this makes that the coverage of BCH channel is littler.So be badly in need of a kind of new technical scheme improving the coverage of BCH channel, and in same Node B, realize multicarrier.
It is special when travelling carriage is in the edge of sub-district, have in a very long time and can't answer or breathe out, this is because travelling carriage is dangerous owing to being in its BCH channel of cell edge, and caused the time of the complete set of searching system block of information to increase, and travelling carriage is the operation that can't answer or breathe out during this period.
In existing UTRA TDD system (comprising LCR and HCR), joint-detection has played great role on the problem that solves the sub-district internal interference, but existing joint-detection can not solve the interference of minizone, so present presence of intercell interference is topmost interference in LCR and HCR system.Recently, new joint detection algorithm occurred, be referred to as multi-plot joint and detect, this joint detection algorithm not only detects the signal of home cell, and the same signal that detects from neighbor cell.But, because the complexity of joint detection algorithm is too high, influenced whole system, so the joint-detection of many sub-districts mainly reduces the algorithm complex that multi-plot joint detects as far as possible.
Summary of the invention
In order to overcome the above problems, the object of the present invention is to provide a method, be used to improve the coverage of BCH channel, be provided among the same Node B and realize multicarrier, and can improve BCH channel receiver performance and avoid occurring above-mentioned situation.
To the multi-cell joint detection method of broadcast channel, comprise the steps: in a kind of tdd systems
(1) portable terminal is by the metrical information in the system broadcast message, the perhaps special-purpose control messages that issues of radio network controller, perhaps the cell signal detection mode comes the multi-plot joint detected cells tabulation of setting up is in advance added or deletion action, described multi-plot joint detected cells tabulation is stored in the portable terminal place, and comprises the neighbor cell parameter reference of home cell and same frequency at least;
(2) described portable terminal is estimated the Primary Common Control Physical Channel of this neighbor cell by this neighbor cell parameter reference corresponding parameters, and carries out matched filtering;
(3) step (2) is carried out in all sub-districts in the tabulation of multi-plot joint detected cells, and with the parallel combined detector of exporting in the described portable terminal of channel estimation results;
(4) in described combined detector, carry out the joint-detection of many sub-districts, and export the Primary Common Control Physical Channel signal of this sub-district.
The step that also comprises this multi-plot joint detected cells tabulation of described mobile terminal to update in described step (1) before, described portable terminal is with the metrical information in the system broadcast message, the perhaps special-purpose control messages that issues of radio network controller, perhaps the received signal code power of Primary Common Control Physical Channel is compared with a threshold value 1 of being scheduled in the cell signal detection mode, and the Primary Common Control Physical Channel corresponding district of selecting a received signal code power is as home cell.
In step (1), also comprise an optimization step, described mobile scanning terminal is with neighbor cell frequently, utilize the signal parameter and a threshold value of being scheduled to 2 of described neighbor cell to compare, if surpass this threshold value 2, then the parameter reference with this neighbor cell adds the tabulation of multi-plot joint detected cells.Described threshold value can be set by user terminal oneself.
In step (1), also comprise an optimization step, described mobile scanning terminal is with neighbor cell frequently, utilize the signal parameter and a threshold value of being scheduled to 2 of described neighbor cell to compare, if be lower than this threshold value 2, then the parameter reference of this neighbor cell is deleted from the tabulation of multi-plot joint detected cells.
In step (1), also comprise an optimization step, described mobile scanning terminal is with neighbor cell frequently, utilize the signal parameter and a threshold value of being scheduled to 2 of described neighbor cell to compare, if surpass this threshold value 2, then the parameter reference with this neighbor cell adds the tabulation of multi-plot joint detected cells, if be lower than this threshold value 2, then the parameter reference of this neighbor cell is deleted from the tabulation of multi-plot joint detected cells.
The parameter of described neighbor cell signal is: the received signal code power of Primary Common Control Physical Channel, or the indication of universal mobile telecommunications system received signal field intensity.
Comprise in neighbor cell parameter reference corresponding parameters described in the step (2): the scrambler of this neighbor cell and basic training sequences.
The employed joint detection algorithm of combined detector is lms algorithm or zero forcing algorithm in the described step (4).
Beneficial effect of the present invention is, has solved this sub-district and has been subjected to the interference problem of neighbor cell, and do not changed the structure of existing system, and cost is low, and can improve the performance of joint-detection.
Description of drawings
Fig. 1 is the inventive method flow chart.
Embodiment
Below, carry out following detailed description for the present invention in conjunction with the accompanying drawings.
The object of the present invention is to provide the user side (UE) of a kind of LCR TDD system to reuse the joint detection receiver of a routine at the TS0 time slot, broadcast channel fixing among the time slot TS0 is carried out multi-plot joint to be detected, therefore can solve problem of inter-cell interference to a great extent, and increase the area coverage of BHC channel at broadcast channel.Primary Common Control Physical Channel must appear among the TS0, and it carries above is exactly the data of BCH, simultaneously, conventional joint-detection can be full and down time slot parallel processing signal (if be time slot in down link for the TCH system), for example in voice service, 2 Resource Unit RU of 8 CUs (the invasin SF=16 of each RU), each RU can both be by parallel detecting.Therefore, from the angle of algorithm complex,, be unchallenged for existing user terminal UE so handle at least 2 BCH channels of home cell and neighbor cell because broadcast channel is fixed in time slot TS0.
Embodiment one:
1. mobile terminal-opening;
2. portable terminal scans the TDD frequency range of its support according to the measurement and the cell information of storage in the past, does not perhaps store and measures and cell information, then needs to rebulid a multi-plot joint detection list;
3. portable terminal is according to the metrical information in the receiving system broadcast, the perhaps special-purpose control messages that issues of radio network controller, and perhaps the cell signal detection mode is in frequency f
1Better sub-district of quality of last discovery, satisfy cell selecting criterion S (definition in 3GPP TS 25.304), promptly the P-CCPCH channel received signal code power (RSCP) of this sub-district is greater than a predetermined threshold value, then selects this sub-district as home cell (in a single day the protocol requirement terminal finds to satisfy cell selecting criterion S in a sub-district, and just to select this sub-district be Serving cell).And the cell parameter index (cell_parameter_ID) of this sub-district resided in the multi-plot joint detection list (MCJD cell list), and this threshold value can be built in user terminal, and can set by user terminal; Because it is just resident that the protocol requirement terminal finds that a sub-district satisfies condition, thus this sub-district is this frequency certainly best sub-district of improving quality, and in the process of Cell searching, the neighbor cell on same frequency all resides at the multi-plot joint detection list.
Following step 4 is in order to reduce algorithm complex, can directly to enter step 5.
4. on frequency, except persistent district, if also have other its P-CCPCH channel received signal code power (RSCP) of co-frequency cell, perhaps universal mobile telecommunications system (UTRA) received signal field intensity indication (RSSI:Received SignalStrength Indication) surpasses a predefine threshold value Δ
P-CCPCHPerhaps Δ
RSSIThe cell parameter index upgrade of these co-frequency cells is arrived in the cell list (MCJD cell list) of multi-plot joint detection, P-CCPCH channel received signal code power (RSCP) or universal mobile telecommunications system received signal field intensity indication (RSSI) be existing definition in 3GPP TS 25.225, and this threshold value Δ
P-CCPCHPerhaps Δ
RSSICan be built in user terminal, and can set by user terminal;
5. portable terminal is done channel estimating to the training sequence (midamble) of P-CCPCH signal respectively to the sub-district among the MCJD cell list;
6. portable terminal is done matched filtering to the P-CCPCH signal that receive sub-district from MCJD cell list respectively, and is input in the conventional combined detector filtered result is parallel;
7. this combined detector can adopt Minimum Mean Square Error (MMSE) or ZF (ZF) algorithm that parallel multi-cell signals is carried out demodulation, only exports the P-CCPCH signal of this sub-district.
Wherein, the cell list (MCJD cell list) that multi-plot joint detects is made of home cell with same frequency and neighbor cell, the cell list that this multi-plot joint detects can only comprise cell parameter index (cell_parameter_ID), but is not limited to this parameter.
Embodiment two:
1. portable terminal 1 moves to cell boarder from the sub-district, and it is periodic finds new better quality co-frequency cell 2 with detecting frequently, and the P-CCPCH RSCP of sub-district 2 satisfies sub-district reselection criterion R (in 3GPP TS 25.304 definition being arranged);
2. it is resident that portable terminal is selected sub-district 2, promptly the P-CCPCH channel received signal code power (RSCP) of this sub-district 2 is greater than a predetermined threshold value, then select this sub-district 2 as home cell, and the cell parameter index (cell_parameter_ID) of sub-district 2 resided in the multi-plot joint detection list (MCJD cell list), and this threshold value can be built in user terminal, and can set by user terminal, upgrade MCJD cell list, wherein the sub-district that comprises in MCJD cell list is the up-to-date system information block type 11 received in sub-district 1 or the co-frequency cell (comprising sub-district 1) in the Class1 2 (SIB11 or SIB12), and the detailed content of described system information block type 11 or Class1 2 is referring to 3GPP TS 25.331;
3. if other is with its P-CCPCH channel received signal code power (RSCP) of neighbor cell frequently, perhaps universal mobile telecommunications system (UTRA) received signal field intensity indication (RSSI) surpasses a threshold value, then this neighbor cell parameter reference is updated in the cell list (MCJD cell list) of multi-plot joint detection;
4. portable terminal obtains the cell parameter index (cell_parameter_ID) of sub-district among the MCJD cell list from SIB11 or SIB12, and this neighbor cell parameter reference is decoded.The cell parameter index by with basic midamble sign indicating number and scrambler be mapping relations one to one, so can uniquely determine a sub-district.Therefore, the scrambler of determining this sub-district P-CCPCH use that this index can be unique and basic midamble sequence;
5. portable terminal utilizes these known scramblers and basic midamble information respectively the P-CCPCH signal of sub-district among the MCJD cell list to be carried out channel estimating and finishes matched filtering respectively, and the result after the matched filtering is walked abreast to be input in the combined detector;
6. this combined detector can adopt Minimum Mean Square Error (MMSE) or ZF (ZF) algorithm that parallel multi-cell signals is carried out demodulation, only exports the P-CCPCH signal of this sub-district.
Embodiment three:
1. portable terminal 1 moves to cell boarder from the sub-district, and it is periodic finds new better quality co-frequency cell 2 with detecting frequently, and the P-CCPCH RSCP of sub-district 2 satisfies sub-district reselection criterion R (in 3GPP TS 25.304 definition being arranged);
2. it is resident that portable terminal is selected sub-district 2, upgrades MCJD cell list simultaneously, and the sub-district that wherein comprises is up-to-date SIB11 or the co-frequency cell of receiving in sub-district 1 among the SIB12 (comprising sub-district 1);
Following step 3 is in order to reduce algorithm complex, can directly to enter step 4.
3. if its P-CCPCH RSCP of the sub-district among the MCJD cell list, perhaps the indication of universal mobile telecommunications system received signal field intensity is lower than a predefine threshold value Δ
P-CCPCHPerhaps Δ
RSSI, these co-frequency cells are deleted from MCJD cell list;
4. portable terminal obtains to upgrade the cell parameter index of sub-district among the MCJD cell list of back from SIB11 or SIB12, the scrambler of determining this sub-district P-CCPCH use that this index can be unique and basic midamble sequence;
5. portable terminal utilizes these known scramblers and basic midamble information respectively the P-CCPCH signal of sub-district among the MCJD cell list to be carried out channel estimating and finishes matched filtering respectively, and the result after the matched filtering is walked abreast to be input in the combined detector;
6. this combined detector can adopt Minimum Mean Square Error or zero forcing algorithm that parallel multi-cell signals is carried out demodulation, only exports the P-CCPCH signal of this sub-district.
Embodiment four: receive system information when upgrading announcement from network, (having had the tabulation of multi-plot joint detected cells with terminal) when portable terminal receives by paging type i/II
Following step 1 is in order to reduce algorithm complex, can directly to enter step 2.
1. mobile terminal UE is to the received signal code power (PSCP:Received Signal Code Power) of the P-CCPCH channel of the neighbor cell in the cell list of all multi-plot joints detections, or universal mobile telecommunications system carrier wave received signal field intensity indication (RSSI) reference data measures, and those list items that surpass the pairing multi-plot joint detected cells tabulation of adjacent co-frequency cells of predetermined threshold are upgraded.
2. portable terminal utilizes these known scramblers and basic midamble information respectively the P-CCPCH signal of sub-district among the MCJD cell list to be carried out channel estimating.
3. portable terminal carries out matched filtering to the P-CCPCH signal from the sub-district in the tabulation of multi-plot joint detected cells that these receive, and to the parallel output result of conventional combination detecting device.
4. the joint detection algorithm of Cai Yonging is a kind of joint detection algorithm of routine, for example based on least mean-square error (MMSE) or ZF (ZF) algorithm, only exports the P-CCPCH signal of this sub-district.
As shown in Figure 1, be the inventive method flow chart.The MCJD cell list of mobile terminal to update oneself, to determine which sub-district is as home cell, and determine which sub-district is adjacent, if start just, then may rebulid a MCJD celllist, a home cell is set, perhaps upgrades step 101 according to the MCJD cell list that has stored.The P-CCPCH RSCP or the UTRA RSSI of neighbor cell are compared step 102 with threshold value.If judge to surpass this threshold value (step 103), then enter step 105.If judge to be lower than this threshold value (step 104), then enter step 106.Step 105 adds MCJD cell list with this sub-district that surpasses threshold value, and upgrades this MCJD cell list.Step 106 is deleted this sub-district that is lower than threshold value from MCJD cell list, and upgrades this MCJD cell list.Step 107 obtains scrambler and basic training sequences in the listed neighbor cell among the MCJD cell list after renewal.Step 108, utilize the scrambler and the basic training sequences that obtain that the P-CCPCH signal of this neighbor cell is estimated, and matched filtering, and circulation execution in step 107 and 108, all carried out till estimation of P-CCPCH signal and the matched filtering sub-district in MCJDcell list.Step 109 is exported to a combined detector above a plurality of results are parallel.Step 110 utilizes combined detector that a plurality of matched filtering results are carried out joint-detection, and the P-CCPCH signal of output home cell.
Beneficial effect of the present invention is, the interference that appears at the neighbor cell of TS0 by the present invention can effectively be reduced, and can improve the demodulation performance of P-CCPCH channel signal, can improve the area coverage and the power consumption that reduces multicarrier among the Node B of BCH channel.Another advantage of the present invention is that the present invention can save power by utilizing conventional combination detecting device not increase the receiving terminal algorithm complex again, enlarges the wave frequency of system.
Above embodiment only is used to illustrate the present invention, but not is used to limit the present invention.
Claims (7)
- In the tdd systems to the multi-cell joint detection method of broadcast channel, it is characterized in that, comprise the steps:(1) portable terminal is by the metrical information in the system broadcast message, the perhaps special-purpose control messages that issues of radio network controller, perhaps the cell signal detection mode comes the multi-plot joint detected cells tabulation of setting up is in advance added or deletion action, described multi-plot joint detected cells tabulation is stored in the portable terminal place, and comprises the neighbor cell parameter reference of home cell and same frequency at least;(2) described portable terminal is estimated the Primary Common Control Physical Channel of this neighbor cell by this neighbor cell parameter reference corresponding parameters;(3) step (2) is carried out in all sub-districts in the tabulation of multi-plot joint detected cells, and with the parallel combined detector of exporting in the described portable terminal of channel estimation results;(4) in described combined detector, carry out the joint-detection of many sub-districts, and export the Primary Common Control Physical Channel signal of this sub-district.
- 2. method according to claim 1, it is characterized in that, the step that also comprises this multi-plot joint detected cells tabulation of described mobile terminal to update in described step (1) before, described portable terminal is with the metrical information in the system broadcast message, the perhaps special-purpose control messages that issues of radio network controller, perhaps the received signal code power of Primary Common Control Physical Channel is compared with a threshold value 1 of being scheduled in the cell signal detection mode, selects a received signal code power to surpass the Primary Common Control Physical Channel corresponding district of this predetermined threshold 1 as home cell.
- 3. method according to claim 1 and 2, it is characterized in that, in step (1), also comprise an optimization step, described mobile scanning terminal is with neighbor cell frequently, utilize the signal parameter and a threshold value of being scheduled to 2 of described neighbor cell to compare, if surpass this threshold value 2, then the parameter reference with this neighbor cell adds the tabulation of multi-plot joint detected cells.
- 4. method according to claim 1 and 2, it is characterized in that, in step (1), also comprise an optimization step, described mobile scanning terminal is with neighbor cell frequently, utilize the signal parameter and a threshold value of being scheduled to 2 of described neighbor cell to compare, if be lower than this threshold value 2, then the parameter reference of this neighbor cell is deleted from the tabulation of multi-plot joint detected cells.
- 5. method according to claim 1 and 2, it is characterized in that, in step (1), also comprise an optimization step, described mobile scanning terminal is with neighbor cell frequently, utilize the signal parameter and a threshold value of being scheduled to 2 of described neighbor cell to compare, if surpass this threshold value 2, then the parameter reference with this neighbor cell adds the tabulation of multi-plot joint detected cells, if be lower than this threshold value 2, then the parameter reference of this neighbor cell is deleted from the tabulation of multi-plot joint detected cells.
- 6. method according to claim 1 is characterized in that, comprises in neighbor cell parameter reference corresponding parameters described in the step (2): the scrambler of this neighbor cell and basic training sequences.
- 7. method according to claim 1 is characterized in that, the employed joint detection algorithm of combined detector is lms algorithm or zero forcing algorithm in the described step (4).
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| CN102098075B (en) * | 2009-12-15 | 2014-01-01 | 中兴通讯股份有限公司 | Joint detection method and device |
| CN101808350B (en) * | 2010-03-15 | 2013-04-03 | 北京天碁科技有限公司 | Common-frequency cell determining method and device |
| US8837304B2 (en) * | 2011-04-08 | 2014-09-16 | Sharp Kabushiki Kaisha | Devices for multi-group communications |
| CN102231901A (en) * | 2011-06-17 | 2011-11-02 | 中兴通讯股份有限公司 | Method for ensuring mobile terminal to reside in network and mobile terminal |
| US8781400B2 (en) * | 2011-06-30 | 2014-07-15 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for reducing co-channel interference |
| CN102958063B (en) * | 2011-08-18 | 2016-01-20 | 中国移动通信集团公司 | Reduce the method, system and device of presence of intercell interference |
| CN103686771B (en) * | 2012-09-20 | 2018-02-02 | 深圳市中兴微电子技术有限公司 | A kind of device, method and terminal for configuring inter-frequency interference cell |
| CN105472633B (en) * | 2014-05-29 | 2020-12-29 | 索尼公司 | Electronic device and method for inter-cell synchronization detection for time division duplex wireless communications |
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