CN1581991B - Method for searching and determining up wireless channel time interval position - Google Patents
Method for searching and determining up wireless channel time interval position Download PDFInfo
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- CN1581991B CN1581991B CN 03140144 CN03140144A CN1581991B CN 1581991 B CN1581991 B CN 1581991B CN 03140144 CN03140144 CN 03140144 CN 03140144 A CN03140144 A CN 03140144A CN 1581991 B CN1581991 B CN 1581991B
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Abstract
The disclosed method is related to GSM network especially. It is adopted in the invention that mobile terminal i.e. handset module dialing any number initiates 'request of channel ' to base station of monitored subzone, and receives 'allotting immediately' signaling replied from the base station. Preact time quantity TA value assigned to the handset module by the base station is contained in signaling of 'allotting immediately'. The TA value indicates time relation between up going wireless channel and down going wireless channel of handset i.e. mobile terminals around monitoring device. The method is applicable to tiny subzone or wide covering sub zone to collect wireless signaling for voice monitoring of mobile phone and optimizing mobile network.
Description
Technical field
The present invention relates to a kind ofly in mobile communication network, the search and the method for definite uplink wireless channel time slot position relate in particular in the GSM communication network search and definite method to the uplink wireless channel time slot position.
Background technology
According to the special requirement of departments such as state security department, when wave point that often need be in wireless communication networks receives the uplink and downlink wireless signal, mobile subscriber's conversation around monitoring; And the up-downgoing signaling often need be monitored at wave point by the operator of mobile communication network, so that the monitor network defective, carries out improvement such as the planning of network and optimization.
In the existing GSM digital cellular network, the radius of the sub-district that a common base station covers can reach 35Km; In the wide coverage cell of some particular arrangement, radius of society can reach 75Km.In the time interval of 1bit in gsm system, about 1.1 kilometers of transmission of wireless signals in order to compensate wireless signal from the base station to the mobile phone, turns back to the transmission delay of base station again from mobile phone, and the base station can will shift to an earlier date by command range base station mobile phone far away launch time; Apart from base station mobile phone far away more, the Timing Advance of emission (TA) is big more.At the base station receiving terminal, the upward signal of this mobile phone just can not fall into because of transmission delay in the channel of next time slot like this, thereby has avoided the signal between time slot to disturb.
This Timing Advance (TA) of mobile phone is by base stations control, and change along with the variation of relative position between portable terminal (mobile phone) and the described base station, therefore when the diverse location of GSM sub-district was monitored mobile phone communication, the mobile phone uplink wireless channel was different with respect to the time slot position of base station reference clock.
In GSM, be to adopt time division multiple access (TDMA) mode on the wireless path.In TDMA, each carrier frequency is defined as a tdma frame, is equivalent to a channel in the FDMA system, and every frame comprises 8 time slots 0～7 (TS0～7), and each time slot is a channel, and therefore, a TRX can have 8 portable terminals to use simultaneously at most.But the every carrier frequency multichannel of tdma system, tdma system can form the frequency time matrix, produces a plurality of time slots on each frequency, and the every bit in this matrix all is a channel, under base stations control is distributed, can be any mobile client phone or non-voice service are provided.
Channel among the GSM is divided into physical channel and logic channel, a physical channel just is a time slot (TS), and logic channel is that these logic channels will be mapped on the physical channel and transmit according to the different Different Logic channels that define of the information category that transmits between base transceiver station BTS and the mobile terminal MS.Direction from base transceiver station BTS to mobile terminal MS is called down link, and opposite direction is called up link.
Logic channel is divided into two big classes, Traffic Channel and control channel again; Described control channel is used to transmit signaling or synchrodata, can be defined as broadcasting, public and special-purpose three kinds of control channels to control channel again according to the required function of finishing.
Described broadcast channel (BCH) segments again, can be divided into
---frequency correction channel (FCCH): carry the message that is used to proofread and correct described mobile terminal MS frequency, down channel, point-to-multipoint (BTS is to a plurality of MS) mode is propagated.
---synchronizing channel (SCH): carry the information of the identification code (BSIC) of the frame synchronization (tdma frame number) of MS and BTS, down channel, the point-to-multipoint mode is propagated.
---Broadcast Control Channel (BCCH): broadcast the general information (cell-specific information) of each BTS, down channel, the point-to-multipoint mode is propagated.
Described Common Control Channel (CCCH) can be subdivided into again:
---paging channel (PCH): be used for paging (search) MS, down channel, the point-to-multipoint mode is propagated.
---Random Access Channel (RACH): MS distributes a Separate Dedicated Control Channel (SDCCH) by this channel request, the access when can be used as to the response of paging or MS caller/registration, and up channel, point-to-point mode is propagated.
---allow access channel (AGCH): be used to MS to distribute a Separate Dedicated Control Channel (SDCCH), down channel, point-to-point mode is propagated.
And in order to intercept the conversation of portable terminal on every side, audiomonitor must correctly be searched for and the time slot position of definite portable terminal uplink wireless channel.
Goal of the invention
The objective of the invention is to propose the method for a kind of search and definite uplink wireless channel time slot position, use the time slot position that this method can search near the portable terminal uplink wireless channel of audiomonitor, this method can both finely be used in Microcell and wide coverage cell, can be used for the speech monitoring of mobile phone and the collection of mobile network optimization wireless signaling.
Technical scheme of the present invention is as follows:
The method of a kind of search and definite uplink wireless channel time slot position is used in the communication network of this method and is included base station and portable terminal, and at least one audiomonitor forms a monitoring sub-district in this communication network, and this method may further comprise the steps:
1) downlink receiver of described audiomonitor during the search rate correction channel, obtains the position of downlink wireless channel time slot 0 at first roughly on the Broadcast Control Channel carrier wave; The position of synchronizing channel training sequence relevant peaks is searched at 8 time slot places after described Broadcast Control Channel again, obtains the exact position of downlink wireless channel time slot 0;
2) described used for mobile terminal upstream transmitter is being monitored on the Random Access Channel of sub-district, the send channel demand signalling, and emission time initial lead is 0;
3) described audiomonitor receives the immediate assignment signaling that the base station is responded with downlink receiver, to this immediate assignment signaling decoding, obtains the Timing Advance that base station assigns is given described upstream transmitter;
4) repeating said steps 2) and described step 3), a plurality of Timing Advance calculating mean values of described upstream transmitter given to obtaining base station assigns, as the Timing Advance of described relatively base station, described audiomonitor position;
Described audiomonitor moves 3 time slots behind the position to described downlink wireless channel time slot 0, and the described Timing Advance that moves forward again obtains this audiomonitor rough position of portable terminal uplink wireless channel time slot 0 on every side; Near the rough position of this uplink wireless channel time slot 0, search for the position of uplink wireless channel training sequence relevant peaks, obtain the exact position of uplink wireless channel time slot 0.
The method of a kind of search provided by the present invention and definite uplink wireless channel time slot position, because downlink receiver is received the immediate assignment signaling of responding the base station decodes, obtain base station assigns and give the Timing Advance of described upstream transmitter, described audiomonitor is with the Timing Advance of this Timing Advance as described relatively base station, its position, therefore no matter audiomonitor is apart from the base station distance, optional position in the sub-district can both accurately search for and definite audiomonitor around the time slot position of portable terminal uplink wireless channel, this method can also satisfy monitoring the requirement of mobile phone communication under the monitoring of the bigger sub-district of covering radius and the vehicle-mounted mobile status.
Description of drawings
Fig. 1 is the portable terminal up-downgoing wireless channel sequential relationship schematic diagram in the inventive method;
Fig. 2 is the search of the inventive method and the schematic flow sheet of definite uplink wireless channel time slot position.
Embodiment
To the enforcement of technical scheme be described in further detail below in conjunction with accompanying drawing:
The basic thought of the method for the invention is: include base station and portable terminal in communication network, and at least one audiomonitor is set in this communication network, forms one and monitor the sub-district, adopting portable terminal is that mobile module (handset transmitter and receiver) is dialed arbitrary numbers, initiate " channel request " to this base station of monitoring the sub-district, and receive " distributing immediately " signaling of responding this base station, and hang up the telephone.Should " distribute immediately " in the signaling and comprise the Timing Advance TA value that described base station assigns is given this mobile module.Through repeatedly measuring a plurality of Timing Advance TA
i, get its mean value as the on-site Timing Advance TA of audiomonitor value, this Timing Advance TA value has shown that promptly the portable terminal around this audiomonitor is the uplink wireless channel of mobile phone and the time relationship of downlink wireless channel.
Audiomonitor described in the inventive method receives frequency correction channel FCCH and the synchronous channel SCH of monitoring cell base station, determines this audiomonitor time slot position of the downlink wireless channel of portable terminal on every side; Then, the described Timing Advance TA value that obtains according to above-mentioned measuring and calculating and the time slot position of downlink wireless channel, search and determine the time slot position of the uplink wireless channel of described portable terminal.
As shown in Figure 1, be portable terminal uplink and downlink wireless channel sequential relationship, described base station is at the time slot 0 of BCCH channel of broadcast control carrier wave, to described monitoring Cell Broadcast CB transmission frequency correction channel FCCH and synchronous channel SCH.Described frequency correction channel (FCCH), transmission is proofreaied and correct the information of its operating frequency for portable terminal, and the base station sends complete 0 or all-ones at this channel, and tranmitting frequency is one has the fixedly sine wave of frequency deviation with carrier frequency.The information that described synchronizing channel (SCH), transmission are carried out synchronously for described portable terminal and described base station is discerned.According to the agreement regulation, described synchronous channel SCH necessarily appears at 8 time slots after the described frequency correction channel FCCH, and the training sequence of described synchronous channel SCH (one section detecting information) is unique constant.
Described downlink receiver is searched for " the fixedly channel of the sine wave of frequency deviation being arranged with carrier frequency ", i.e. frequency correction channel FCCH on the BCCH channel of broadcast control carrier wave.Because this frequency correction channel FCCH is in time slot 0 position of BCCH channel of broadcast control carrier wave, so find described frequency correction channel FCCH just can determine the position of its downlink wireless channel time slot 0 roughly.Then, 8 time slots (being the time slot 0 of next frame) after this frequency correction channel FCCH, search synchronous channel SCH.Because the training sequence of this synchronous channel SCH is known, so, can accurately determine the position of downlink wireless channel time slot 0 by seeking the position of SCH training sequence relevant peaks.
As shown in Figure 1, the clock of portable terminal downlink wireless channel has one with respect to base station clock and postpones Delay, and this delay Delay is the transmission delay of downstream wireless signals from this base station to this portable terminal.
According to the agreement regulation, the uplink wireless channel of described portable terminal (emission) has the delay of 3 time slots with respect to downlink wireless channel (reception); In addition, in order to compensate the transmission delay between described base station and this portable terminal, the emission of described portable terminal has the Timing Advance TA of certain numerical value.This Timing Advance TA can be by described base station measurement and control.
As shown in Figure 2, the inventive method is specific as follows:
At first, on described BCCH channel of broadcast control carrier wave, search for described frequency correction channel FCCH, determine the position of described downlink wireless channel time slot 0 roughly with downlink receiver.The position of described synchronous channel SCH training sequence relevant peaks is searched at 8 time slot places after this frequency correction channel FCCH, obtains the exact position of downlink wireless channel time slot 0.Because the training sequence of this synchronous SCH channel is known, the training sequence relevant peaks is positioned at the central authorities of time slot, is the position that benchmark can accurately be determined downlink wireless channel time slot 0 with the position of relevant peaks.
Near uplink wireless channel time slot 0 rough position, search for the position of training sequence relevant peaks, can obtain the exact position of uplink wireless channel time slot 0
Adopting portable terminal is that mobile module (handset transmitter and receiver) is dialed arbitrary numbers, and the mobile phone upstream transmitter is monitored on the Random Access Channel RACH of sub-district at this, emission " channel request channelrequest " signaling.Owing to do not know the Timing Advance of the described relatively base station of this upstream transmitter, the Timing Advance of its emission channel request is 0.The portable terminal that described base station receives on the described Random Access Channel RACH transmits, and searches for the relevant peaks of this Random Access Channel RACH training sequence, arrives the time of this base station as this portable terminal upward signal.The described portable terminal upward signal of this base station measurement arrives the delay of the time of this base station with respect to this base station clock, the i.e. transmission delay of wireless signal.This base station is responded and is given described portable terminal " immediate assignment immediate assignment " signaling according to measurement result, distributes to described portable terminal emission time initial lead TAi.
Receive " immediate assignment immediate assignment " signaling that described base station is responded with downlink receiver, decoding promptly obtains described Timing Advance TA
iValue.The repetition said process takes multiple measurements, and averages then, promptly obtains near the emission time initial lead TA of the portable terminal of described audiomonitor.This Timing Advance TA value shows that portable terminal is the uplink wireless channel of mobile phone and the time relationship of downlink wireless channel around the described audiomonitor.
3 time slots " are afterwards moved " in the position of described downlink wireless channel time slot 0, and " reach " described Timing Advance TA more promptly obtains the rough position of the portable terminal uplink wireless channel time slot 0 around the described audiomonitor.
Near the rough position of this uplink wireless channel time slot 0, search for the position of uplink wireless channel training sequence relevant peaks with uplink receiver, can obtain the exact position of uplink wireless channel time slot 0.Can realize monitoring thus to uplink wireless channel.
A kind of search that provides of the present invention and the method for definite uplink wireless channel time slot position are used the time slot position that this method can search near the uplink wireless channel of the portable terminal of described audiomonitor.This method can both well be used in Microcell and wide coverage cell, and the speech that can be used for mobile phone is monitored and the collection of the wireless signaling that the mobile network carries out for the optimization network.
Claims (1)
1. the search and the method for definite uplink wireless channel time slot position are used in the communication network of this method and are included base station and portable terminal, and at least one audiomonitor forms a monitoring sub-district in this communication network, and this method may further comprise the steps:
1) downlink receiver of described audiomonitor during the search rate correction channel, obtains the position of downlink wireless channel time slot 0 at first roughly on the Broadcast Control Channel carrier wave; The position of synchronizing channel training sequence relevant peaks is searched at 8 time slot places after described Broadcast Control Channel again, obtains the exact position of downlink wireless channel time slot 0;
2) described used for mobile terminal upstream transmitter is being monitored on the Random Access Channel of sub-district, the send channel demand signalling, and emission time initial lead is 0;
3) described audiomonitor receives the immediate assignment signaling that the base station is responded with downlink receiver, to this immediate assignment signaling decoding, obtains the Timing Advance that base station assigns is given described upstream transmitter;
4) repeating said steps 2) and described step 3), a plurality of Timing Advance calculating mean values of described upstream transmitter given to the base station assigns that obtains, as the Timing Advance of described relatively base station, described audiomonitor position;
5) move 3 time slots behind the exact position of described audiomonitor to described downlink wireless channel time slot 0, move forward the again Timing Advance of described relatively base station, described audiomonitor position obtains the rough position of portable terminal uplink wireless channel time slot 0 around this audiomonitor; Near the rough position of this uplink wireless channel time slot 0, search for the position of uplink wireless channel training sequence relevant peaks, obtain the exact position of uplink wireless channel time slot 0.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03140144 CN1581991B (en) | 2003-08-07 | 2003-08-07 | Method for searching and determining up wireless channel time interval position |
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|---|---|---|---|
| CN 03140144 CN1581991B (en) | 2003-08-07 | 2003-08-07 | Method for searching and determining up wireless channel time interval position |
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| CN1581991A CN1581991A (en) | 2005-02-16 |
| CN1581991B true CN1581991B (en) | 2010-07-14 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100652712B1 (en) * | 2005-01-25 | 2006-12-01 | 엘지전자 주식회사 | Network registration method for umts system |
| ZA200810735B (en) * | 2006-06-01 | 2010-03-31 | Sharp Kk | Method for connecting mobile station to base station, mobile station, base station, multi-carrier mobile communication system, and random access channel mapping method |
| CN101404538B (en) * | 2008-11-07 | 2012-04-04 | 武汉虹信通信技术有限责任公司 | Method and device for realizing GSM time slot synchronization and repeater energy saving |
| CN102123475B (en) | 2010-01-12 | 2015-08-19 | 华为技术有限公司 | A kind of defining method of timing advance grouping and device |
| CN112637833B (en) * | 2020-12-21 | 2022-10-11 | 新疆品宣生物科技有限责任公司 | Communication terminal information detection method and equipment |
| CN113938940B (en) * | 2021-09-29 | 2023-08-29 | 北京鼎普科技股份有限公司 | Accurate concurrent positioning method and system for GSM terminal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267439A (en) * | 1997-06-18 | 2000-09-20 | 诺基亚流动电话有限公司 | Method for identifying base station of time division cellular network in mobile station and mobile station |
| JP2002186020A (en) * | 2001-10-24 | 2002-06-28 | Hitachi Ltd | Control signal transmission method in mobile communication system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267439A (en) * | 1997-06-18 | 2000-09-20 | 诺基亚流动电话有限公司 | Method for identifying base station of time division cellular network in mobile station and mobile station |
| JP2002186020A (en) * | 2001-10-24 | 2002-06-28 | Hitachi Ltd | Control signal transmission method in mobile communication system |
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Granted publication date: 20100714 Termination date: 20130807 |