CN1582001A - Method for high-frequency amplifying station to gain switching point in TD-SCDMA system - Google Patents
Method for high-frequency amplifying station to gain switching point in TD-SCDMA system Download PDFInfo
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- CN1582001A CN1582001A CN 03149958 CN03149958A CN1582001A CN 1582001 A CN1582001 A CN 1582001A CN 03149958 CN03149958 CN 03149958 CN 03149958 A CN03149958 A CN 03149958A CN 1582001 A CN1582001 A CN 1582001A
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Abstract
The method is in use for enhancing and forwarding up going signal between first and second transition points in same sub frame, and for enhancing and forwarding down going signal between second transition point in this sub frame and first transition point in next sub frame. The method includes steps: (a) information of position of second transition point is placed in broadcast channel for transmitting; (b) straight through station obtains time of first transition point; (c) demodulating two initial code channels in time slot in sub frame; (d) picking up information of position of second transition point from demodulated result from (c). Information of second transition point transmitted through broadcast channel is updated dynamically. Enhancing and forwarding up going signal and down going signals, straight through stations repeat step (c) and (d). Comparing with prior art, the invention makes straight through station workable even time slot allocation in ever changing condition.
Description
Technical field
The present invention relates to the TD-SCDMA system, specifically, relate to the method that repeater in the TD-SCDMA system obtains transfer point.
Background technology
TD SDMA (TD-SCDMA) is by one of three main standard of the 3G (Third Generation) Moblie (3G) of International Telecommunication Union and 3GPP approval.TD-SCDMA is called as low spreading rate (1.28MCps, 1.28 million chips/sec) time-division multiplex technology scheme in the ITU standard.
As shown in Figure 1, in time, the TD-SCDMA signal is divided into periodic time quantum.A basic time quantum is called " radio frames ", and the length of each radio frames is 10ms.Each radio frames is divided into two equal in length " subframe ", and the length of each subframe is 5ms.Each subframe is divided into several different parts; 7 time slots (TS) that time span is identical are wherein arranged; the length of each time slot is 0.675ms; and descending pilot frequency time slot (DwPTS), uplink pilot time slot (UpPTS) and the segment protect interval (GP) of position between time slot TS0 and time slot TS1, their time span is respectively 75 μ s, 125 μ s and 75 μ s.
According to the difference of sense, each time slot is divided into two types of up direction and down directions.Up direction is meant that the wireless signal that transmits is by subscriber terminal equipment (UE) emission in this time slot, base station (Node-B) receives; Down direction is meant that the wireless signal that transmits is launched by Node-B in this time slot, UE receives.
In the TD-SCDMA standard, TS0 always is designated as down direction, and TS1 always is designated as up direction.TS2, TS3 ..., TS6 will dynamically be appointed as up direction or down direction according to the needs of business.In addition, DwPTS is a down direction, and UpPTS is a up direction.Between the time slot of up direction and the time slot of down direction, separately by a transfer point.In each subframe, two transfer points are arranged: first transfer point is to forward up direction to from down direction, the GP of position between DwPTS and UpPTS; Second transfer point is to forward down direction to from up direction, and the position is in each subframe between last ascending time slot and second descending time slot (TS0 is first descending time slot).Wherein, first transfer point was fixed with respect to the time started of each subframe; Second transfer point be along with TS2 ..., TS6 is designated as the ascending time slot and the descending time slot of varying number, and it will change to some extent with respect to the time started of each subframe.
Fig. 2 has enumerated the different situation of several position of conversion point.As shown in Figure 2, a) in second transfer point between up direction time slot TS1 and down direction time slot TS2; B) second transfer point is between up direction time slot TS2 and down direction time slot TS3; C) second transfer point is between up direction time slot TS3 and down direction time slot TS4.
In the TD-SCDMA network, need the repeater of some and base station to be used in combination.The signal that send base station and mobile phone the repeater strengthens and transmits, thereby the coverage of communication network is expanded or replenished.In the application of present repeater, wireless discharging-directly station has obtained a large amount of application with its low price, addressing convenience, the simple advantage of transmission.
The operation principle of existing wireless discharging-directly station is, on down direction, the donor antenna of repeater receives the downstream signal from the base station, by own radio system amplify and processing after, the retransmitting antenna by the repeater is forwarded to mobile phone again; On up direction, the retransmitting antenna of repeater receives the upward signal from mobile phone simultaneously, and after same the processing, the donor antenna by the repeater is forwarded to the base station again.Existing repeater may operate in the mobile communication system such as GSM, IS95, CDMA2000, W-CDMA.In these systems, the up-link wireless signal is in different frequencies with downstream wireless signals.Therefore, existing repeater has generally comprised two cover treatment systems, respectively upward signal and downstream signal is received, amplifies and processing such as emission.This two covers treatment system is operated on the different frequencies.
But in the TD-SCDMA system, upward signal and downstream signal are in same frequency, distinguish uplink and downlink by time-multiplexed mode.If use existing repeater in the TD-SCDMA system, the uplink and downlink treatment system of repeater will be operated on the identical frequency, and uplink and downlink signals will produce positive feedback, causes signal degradation, and the repeater can't be used.
Can know that from the description of front Node-B will constantly adjust the state of its transmitter and receiver between two transfer points.In each subframe, before first transfer point, Node-B is in emission state; Between first and second transfer point, Node-B is in accepting state; After second transfer point, Node-B is in emission state.
Therefore, the thinking that addresses this problem is, in each subframe, the repeater only strengthens between first and second transfer point and transmits upward signal, between first transfer point of second transfer point and next subframe, only strengthen and converting downlink signal, thereby avoid the up-downgoing treatment system to work simultaneously.
Prior art is achieved in that the repeater mates by one or more matched filters and signal among the DwPTS that receives, learn that DwPTS arrives the time of repeater, because first transfer point of every subframe is in the GP between DwPTS and the UpPTS the time period, thereby the repeater can calculate the time of first transfer point.But, the time that can't obtain second transfer point by similar method.It is between TS3 and TS4 (perhaps other time slot) that the repeater can be given tacit consent to second transfer point simply, if it is that to be fixed as TS1～TS3 be that up, TS4～TS6 is descending that the uplink and downlink timeslot of mobile network system configuration distributes, just can use such repeater.
If it is alternate manner that the uplink and downlink timeslot of mobile network system configuration distributes, perhaps the uplink and downlink timeslot method of salary distribution of mobile network system configuration is among the continuous variation, and then the repeater is owing to the position that can not obtain second transfer point can't be used.
Summary of the invention
The purpose of this invention is to provide the method that repeater in a kind of TD-SCDMA system obtains second transfer point.
Broadcast channel (BCH) is a descending transmission channel, is used for the peculiar information of broadcast system and sub-district.BCH is mapped on two basic Common Control Physical Channels (P-CCPCH1 and P-CCPCH2) in physical layer.In the TD-SCDMA system, the time slot of P-CCPCH1 and P-CCPCH2 is fixing TS0, and the spreading factor that is mapped to TS0 is initial two code channels (0 code channel and 1 code channel) of 16.
The method that the present invention proposes is in the BCH channel, utilizes at least 3 bits, represents the information of second transfer point of this sub-district.For example, represent that with digital n second transfer point is between n time slot of every subframe and n+1 time slot.The span of n is 1,2 ..., 5, numerical value n is added in the information that the BCH channel carries.
Because first transfer point of every subframe is in the GP between DwPTS and the UpPTS the time period, the repeater can calculate the time of first transfer point.Thus, the position of two transfer points of every subframe just can be learnt in the repeater.
Therefore, the invention provides the method that repeater in a kind of TD-SCDMA system obtains transfer point, be used to strengthen and transmit upward signal between each subframe first and second transfer point, and strengthen and transmit the downstream signal between first transfer point in second transfer point of this subframe and next subframe, this method comprises the steps:
A. second position of conversion point information is placed in the broadcast channel and transmits;
B. the repeater obtains the time of first transfer point of subframe;
C. initial two code channels of 0 time slot in the demodulation subframe;
D. from step c demodulation result, extract the information of second position of conversion point, obtain the time of second transfer point.
Wherein, utilize the idle component of broadcast channel to represent that the information of second position of conversion point finished by Node-B or RNC.
Wherein, utilize broadcast channel to represent that the information of second position of conversion point dynamically updates; The repeater by repeated execution of steps c and d, obtains the situation of change of second position of conversion point when constantly doing enhancing and transmitting the upstream or downstream signal.
The present invention has overcome existing repeater can not be in the shortcoming of working under the situation of continuous variation in the uplink and downlink timeslot method of salary distribution of TD-SCDMA system configuration.
Description of drawings
Fig. 1 is the TD-SCDMA frame structure;
Fig. 2 is the schematic diagram of position of conversion point;
Fig. 3 is the burst format of DwPTS time slot;
Fig. 4 is a P-CCPCH physical channel wireless burst form;
Fig. 5 is the flow chart that repeater of the present invention obtains transfer point information.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below the present invention is described in more detail with reference to accompanying drawing.
Fig. 3 is the burst format of DwPTS time slot, and content comprises the GP of 32 chips (chips) and the SYNC_DL of 64 chips, and total time span is 75 μ s.Wherein, SYNC_DL is 64 predetermined PN sequences of a system, and SYNC_DL has 32 kinds of possible selections at most.
Fig. 4 is a P-CCPCH physical channel wireless burst form, and content comprises the data (Data symbols) of two 352chips, the user's training sequence (Midamble) of 144chips and the GP of 16chips.Wherein, the midamble sign indicating number is the result of the different cyclic shifts of a basic midamble sign indicating number, and displacement can be 8 integral multiple at interval, only uses a kind of fixing displacement mode in the same sub-district, and system has 128 basic midamble sign indicating numbers.
In the TD-SCDMA system, travelling carriage sends first and only inserts request at random from starting shooting to, be divided into that down-going synchronous is caught, system information reads, set up uplink synchronous, insert four processes at random, the repeater utilizes the first two steps of this process among the present invention, be that down-going synchronous is caught with system information and read, obtain the positional information of subframe second transfer point.
Fig. 5 is the flow chart that repeater of the present invention obtains transfer point information.As shown in Figure 5, to obtain the flow process of transfer point information as follows in the repeater:
Step 01, the repeater receives sub-frame information.Because the repeater only is responsible for strengthening and transmitting the signal that Node-B sends, so the positional information that at least 3 bits are represented second transfer point can not be finished in the idle component that utilizes BCH in repeater self, this function can only be finished by Node-B, and perhaps the RNC by control Node-B finishes.
Step 02 is calculated the time that DwPTS arrives the repeater.Mate by one or more matched filters and signal among the DwPTS that receives the repeater, obtains this time.
The burst format of DwPTS time slot as shown in Figure 3.The SYNC_DL of neighbor cell is different in the system.SYNC_DL is included in the DwPTS time slot in the TD_SCDMA wireless burst, and according to the wireless frame structure of TD-SCDMA, SYNC_DL each subframe time (5ms) in system sends once, and all sends this information with constant full power value at every turn.During the UE connecting system, 32 SYNC_DL code words are searched for (promptly using received signal and 32 possible SYNC_DL code words cross-correlation one by one) one by one, because this code word has orthogonality preferably to each other, the code word of obtaining the correlation peak maximum is considered to the SYNC DL that present access subzone uses.Simultaneously, also can tentatively determine the timing of system descending according to the time location of correlation peak.The method of UE connecting system is used in the repeater, determines the time of the arrival repeater of DwPTS in each subframe.
Step 03 is obtained first transfer point time.As shown in Figure 1, DwPTS and first transfer point (GP) have the regular time relation, so can directly obtain the time of first transfer point according to the result of step 02.
Step 04,0 code channel of demodulation TS0 time slot and 1 code channel.Carry the BCH of the second position of conversion point information, be mapped on two basic Common Control Physical Channels (P-CCPCH1 and P-CCPCH2) in physical layer, in the TD-SCDMA system, the time slot of P-CCPCH1 and P-CCPCH2 is fixing TS0, the spreading factor that is mapped to TS0 is initial two code channels of 16, i.e. 0 code channel and 1 code channel.
To from Data symbols territory, solve system broadcast message, need obtain 4 information: a) parameter model of wireless channel; B) scrambler (Scrambling code) of current area use; C) System Frame Number; D) spreading factor and the spreading code of the use of BCH information.
A). the wireless channel parameter is by decoding obtains to the training sequence in the wireless burst structure (midamble sign indicating number).Corresponding 4 the basic midamble sign indicating numbers of each SYNC_DL sequence, because SYNC_DL obtains in step 01, the repeater only needs the out of phase of testing these 4 basic codes one by one with correlation technique, both can find the used midamble sign indicating number of current system, can estimate the parameter of current wireless channel simultaneously.
B). scrambler and the midamble sign indicating number that use the sub-district are one to one, and it is used to distinguish the user of different districts, and in same sub-district, the scrambler that all users use is identical with the midamble sign indicating number.
C). in order correctly to solve the information among the BCH, the System Frame Number of each frame must be known in the repeater.System Frame Number is embodied in the Pareto diagram of physical channel 4 phase phase-shift keyings (QPSK) when modulation phase change.N continuous DwPTS time slot carried out phase-detection, just can find System Frame Number, it is synchronous promptly to obtain multi-frame.The position of BCH information in P-CCPCH channel frame structure just can have been determined like this.
D). press system requirements, the spreading factor of BCH message is 16, and code channel uses 0 code channel and 1 code channel.
According to above-mentioned information, the decoding of separating mediation BCH to P-CCPCH is finished in the repeater, understands system message.
Step 05 is obtained second transfer point time.Extract the information of second position of conversion point entrained all information of the BCH that comes out from step 04 demodulation,,, can directly obtain the time of second transfer point therefore according to the position of second transfer point because the length of each time slot is 0.675ms.Because the uplink and downlink timeslot method of salary distribution is among the continuous variation, so repeating step 04 and 05 when upward signal or downstream signal need and be transmitted in the do enhancing in the repeater constantly obtains second transfer point through updated time information.
The repeater obtains after the transfer point information of each subframe, between subframe first and second transfer point, only strengthen and transmit upward signal, between first transfer point of second and next subframe, only strengthen and converting downlink signal, thereby avoided the up-downgoing treatment system to work simultaneously.
Claims (7)
1. the repeater obtains the method for transfer point in the TD-SCDMA system, be used to strengthen and transmit upward signal between same subframe first and second transfer point, and strengthen and transmit the downstream signal between first transfer point in second transfer point of this subframe and next subframe, it is characterized in that this method comprises the steps:
A. second position of conversion point information is placed in the broadcast channel and transmits;
B. the repeater obtains the time of first transfer point of subframe;
C. initial two code channels of 0 time slot in the demodulation subframe;
D. from step c demodulation result, extract the information of second position of conversion point, obtain the time of second transfer point.
2. the repeater obtains the method for transfer point in the TD-SCDMA according to claim 1 system, it is characterized in that: the described information of second position of conversion point of broadcast channel transmission of utilizing of step a is finished by the base station.
3. the repeater obtains the method for transfer point in the TD-SCDMA according to claim 1 system, it is characterized in that: the described information of second position of conversion point of broadcast channel transmission of utilizing of step a is finished by radio network controller.
4. the repeater obtains the method for transfer point in the TD-SCDMA according to claim 1 system, and it is characterized in that: the information of described second position of conversion point of step a is to be recorded at least 3 bits of broadcast channel idle component.
5. the repeater obtains the method for transfer point in the TD-SCDMA according to claim 1 system, it is characterized in that: step b is by calculating first transfer point time that time that descending pilot frequency time slot in the subframe arrives the repeater obtains subframe.
6. the repeater obtains the method for transfer point in the TD-SCDMA according to claim 1 system, it is characterized in that: the described information of second position of conversion point of broadcast channel transmission of utilizing of step a dynamically updates.
7. the repeater obtains the method for transfer point in the TD-SCDMA according to claim 1 system, and it is characterized in that: described step c and d repeat, and obtain the situation of change of second position of conversion point.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031499589A CN1330192C (en) | 2003-07-31 | 2003-07-31 | Method for high-frequency amplifying station to gain switching point in TD-SCDMA system |
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| CNB031499589A CN1330192C (en) | 2003-07-31 | 2003-07-31 | Method for high-frequency amplifying station to gain switching point in TD-SCDMA system |
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| CN1330192C CN1330192C (en) | 2007-08-01 |
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Cited By (13)
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| CN100377511C (en) * | 2005-06-02 | 2008-03-26 | 武汉虹信通信技术有限责任公司 | Method for implementing uplink and downlink switching of TD-SCDMA repeater |
| CN100399731C (en) * | 2005-06-02 | 2008-07-02 | 武汉虹信通信技术有限责任公司 | Method for obtaining converting point position information by TDSCDMA repeater |
| CN100433856C (en) * | 2005-07-22 | 2008-11-12 | 华为技术有限公司 | Cluster multi call connecting method |
| CN100463555C (en) * | 2006-08-22 | 2009-02-18 | 京信通信技术(广州)有限公司 | TD-SCDMA shrouding system and its time slot power reading method |
| WO2009046625A1 (en) * | 2007-09-26 | 2009-04-16 | Datang Mobile Communications Equipment Co., Ltd. | A method and device for allocating time slots of radio frame in time division duplexing mobile communication system |
| CN100536424C (en) * | 2006-03-23 | 2009-09-02 | 华为技术有限公司 | Downlink carrier network and its method for transmitting downlink data |
| CN101207429B (en) * | 2007-12-14 | 2011-02-16 | 北京北方烽火科技有限公司 | Apparatus and method for obtaining switch point in TDD WiMAX straight amplification station |
| CN101242639B (en) * | 2007-02-07 | 2011-03-30 | 大唐移动通信设备有限公司 | Method and system for sending change information of time slot switch point and updating time slot switch point |
| CN1996788B (en) * | 2006-12-01 | 2012-07-04 | 陕西佳圣通讯科技有限公司 | Configuration device and adjusting method of the time slot of the wireless network direct station based on the satellite synchronization |
| CN101483477B (en) * | 2008-12-30 | 2012-10-24 | 珠海银邮光电技术发展股份有限公司 | Method for automatically obtaining the second break point by TD-SCDMA repeater |
| CN101217720B (en) * | 2008-01-16 | 2013-02-06 | 福建先创电子有限公司 | An acquisition method of transition point of repeater in TD-SCDMA network overlay system |
| CN103023528A (en) * | 2012-11-23 | 2013-04-03 | 奥维通信股份有限公司 | High efficiency stable TD-SCDMA (time division-synchronization code division multiple access) time division switch searching system and method |
| CN103906221A (en) * | 2012-12-26 | 2014-07-02 | 重庆重邮信科通信技术有限公司 | Method for acquiring location information of second switching point, and wireless terminal module and repeater |
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| FI103467B1 (en) * | 1996-07-25 | 1999-06-30 | Nokia Telecommunications Oy | Cell expansion in a time-division cellular system |
| CN2398791Y (en) * | 1999-07-29 | 2000-09-27 | 厦门华侨电子企业有限公司 | 350 MHz frequency range mobile communication direct transport station |
| GB2383233B (en) * | 2001-12-15 | 2004-01-07 | Motorola Inc | An apparatus for allocating timeslots and method therefor |
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- 2003-07-31 CN CNB031499589A patent/CN1330192C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100399731C (en) * | 2005-06-02 | 2008-07-02 | 武汉虹信通信技术有限责任公司 | Method for obtaining converting point position information by TDSCDMA repeater |
| CN100377511C (en) * | 2005-06-02 | 2008-03-26 | 武汉虹信通信技术有限责任公司 | Method for implementing uplink and downlink switching of TD-SCDMA repeater |
| CN100433856C (en) * | 2005-07-22 | 2008-11-12 | 华为技术有限公司 | Cluster multi call connecting method |
| CN100536424C (en) * | 2006-03-23 | 2009-09-02 | 华为技术有限公司 | Downlink carrier network and its method for transmitting downlink data |
| CN100463555C (en) * | 2006-08-22 | 2009-02-18 | 京信通信技术(广州)有限公司 | TD-SCDMA shrouding system and its time slot power reading method |
| CN1996788B (en) * | 2006-12-01 | 2012-07-04 | 陕西佳圣通讯科技有限公司 | Configuration device and adjusting method of the time slot of the wireless network direct station based on the satellite synchronization |
| CN101242639B (en) * | 2007-02-07 | 2011-03-30 | 大唐移动通信设备有限公司 | Method and system for sending change information of time slot switch point and updating time slot switch point |
| CN101400128B (en) * | 2007-09-26 | 2012-04-25 | 大唐移动通信设备有限公司 | Method and device for wireless timeslot allocation in time division duplexing mobile communication system |
| WO2009046625A1 (en) * | 2007-09-26 | 2009-04-16 | Datang Mobile Communications Equipment Co., Ltd. | A method and device for allocating time slots of radio frame in time division duplexing mobile communication system |
| CN101207429B (en) * | 2007-12-14 | 2011-02-16 | 北京北方烽火科技有限公司 | Apparatus and method for obtaining switch point in TDD WiMAX straight amplification station |
| CN101217720B (en) * | 2008-01-16 | 2013-02-06 | 福建先创电子有限公司 | An acquisition method of transition point of repeater in TD-SCDMA network overlay system |
| CN101483477B (en) * | 2008-12-30 | 2012-10-24 | 珠海银邮光电技术发展股份有限公司 | Method for automatically obtaining the second break point by TD-SCDMA repeater |
| CN103023528A (en) * | 2012-11-23 | 2013-04-03 | 奥维通信股份有限公司 | High efficiency stable TD-SCDMA (time division-synchronization code division multiple access) time division switch searching system and method |
| CN103023528B (en) * | 2012-11-23 | 2015-08-19 | 奥维通信股份有限公司 | A kind of TD-SCDMA time-division switching search system of efficient stable and method |
| CN103906221A (en) * | 2012-12-26 | 2014-07-02 | 重庆重邮信科通信技术有限公司 | Method for acquiring location information of second switching point, and wireless terminal module and repeater |
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