CN1549470A - Method for enlarging measuring window in TDMA mobile communication system - Google Patents
Method for enlarging measuring window in TDMA mobile communication system Download PDFInfo
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- CN1549470A CN1549470A CNA03131130XA CN03131130A CN1549470A CN 1549470 A CN1549470 A CN 1549470A CN A03131130X A CNA03131130X A CN A03131130XA CN 03131130 A CN03131130 A CN 03131130A CN 1549470 A CN1549470 A CN 1549470A
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Abstract
The present invention provides a method for expanding measuring window in TDMA communication system. Said invention adopts discontinuous distribution resource unit technique, and for speech communication and data communication the user's equipment also adopts the discontinuous distribution resource unit method. It is characterized by that the data of odd subframe can be placed into even subframe to make transmission, so that the resource unit of add subframe is empty, and combined with adjacent those idle time slots so as to form the measuring window. As compared with existent technology the number of idle time slots obtained by said invention for making synchronous detection can be obviously raised, and the success rate for detecting adjacent other communication system by using user's communication equipment of TDMA system can be greatly increased.
Description
(1) technical field
The invention discloses between a kind of mobile communication system medium frequency and the method for measurement between the system, so that subscriber equipment and another communication system are synchronous.More particularly, relate to the method that enlarges measurement window in a kind of time division multiple access (TDMA) mobile communication system, before the subscriber equipment of TDMA switches to another communication system, the synchronizing channel of the base station of the system of this user equipment monitors adjacent cell (can belong to identical system, also can belong to different systems).
(2) background technology
Present widely used mobile communication system is global system for mobile communications (GSM), and base station distribution is wide, and network coverage face is big.Rise along with the third generation (3G) mobile communication technology, Frequency Division Duplexing (FDD) (FDD) system (WCDMA), 3.84Mcps time division duplex (TDD) system (HCR), 1.28McpsTDD (TDSCDMA) system, with setting up base station foundation new network separately, provide telecommunications service to the public.At that time, each network of different system is adjacent to each other, or overlapping covering, and when the user moved to another ground from a ground, user equipment (UE) (for example mobile phone) must be roamed (roaming) or switch (handover) between different communication systems.For making 1.28McpsTDD subscriber equipment (UE) in different system, for example all can operate as normal in GSM and TDSCDMA system, a kind of dual-mode user device (dual modeUE) develops.Signal another system is more and more stronger to the signal of existing system is weak gradually when this user equipment monitors, will select a good opportunity to switch in one system of back and work on, before switching, subscriber equipment will be carried out the monitoring between the frequency and between the system, monitor the time slot position (timing) of the synchronizing channel of back one system, so that this subscriber equipment is adjusted to back one system synchronization and switched.
At tdma system, for example in the 1.28McpsTDD system, transmission is discontinuous, so, there is not professional idle time slot at those of uplink and downlink interchannel, can be used in theory carrying out between the above-mentioned frequency and the monitoring between the system.Thisly be used between the synchronous frequency and the monitoring between the system, between adjacent uplink and downlink Traffic Channel those do not have professional idle time slot to be called " measurement window ".1.28McpsTDD each frame that transmits in the system comprises two subframes (strange subframe and even subframe), each subframe is 5 milliseconds, divides up/descending totally seven time slot TS0 to TS1.For voice communication, the uplink and downlink channel respectively takies a time slot, and generally speaking, those of adjacent uplink and downlink interchannel do not have professional idle time slot to have only 2 to 3.The measurement window of this time slot allocation layout is shorter, do not have time enough to carry out and measure and monitoring, thereby the 1.28McpsTDD subscriber equipment reaches and next system synchronization needed than the time of growing, and under the serious situation, the subscriber equipment of 1.28McpsTDD can't be measured other communication systems.According to 3GPP technical report TR25.888 (http: //
Www.3GPP.orgProvide and browse and download) simulation result show that if adopt traditional symmetrical time slot allocation pattern in the 1.28McpsTDD system, when its subscriber equipment switched with gsm system, be 896.5ms maximum lock in time, the possibility that monitoring is slipped up is up to 41.9%; When this subscriber equipment and the switching of FDD system, be 748.6ms maximum lock in time; When switching with the 3.84McpsTDD system, the synchronous possibility of success has only 40-60%; When switching with the 1.28McpsTDD system of other different frequency, the synchronous possibility of success has only 30-50%.Such result can not be satisfactory.
Be head it off, 3GPP technical report TR25.888 (http: //
Www.3GPP.orgProvide and browse and download) in the 1.28McpsTDD system has been proposed two kinds of improved method of measurement: asymmetric time slot allocation pattern and different time-gap assign group syntype, purpose all is to enlarge the size of measurement window, for monitoring provides more time, to reduce the monitoring fault rate.The synchronous required time has been shortened in this improvement to a certain extent, has improved the quality of monitoring.As an example, when the subscriber equipment of 1.28McpsTDD and adjacent FDD sub-district are synchronous, can utilize asymmetric time slot allocation pattern.The subscriber equipment of a 1.28Mcps TDD (UE) wants to switch to the FDD system and with it synchronously the time, first synchronizing channel (primary SCH) that this subscriber equipment can be monitored the FDD system is obtaining its time slot position (timing), and the SSC Secondary Synchronisation Code (secondary SCH) of monitoring FDD is to obtain frame position (frame timing).When Fig. 1 represents that the subscriber equipment of existing 1.28McpsTDD adopts symmetry and asymmetric time slot allocation pattern, the comparison of measurement window length, wherein, the measurement window in the subframe of the 1.28McpsTDD under the symmetrical time slot allocation pattern of last row's expression; Middle row represents the frame of FDD system, and 10 milliseconds of every frames have synchronizing channel; Measurement window under the asymmetric time slot allocation pattern of following row's expression in the subframe of 1.28McpsTDD.For first synchronizing channel of FDD, first synchronous code (PSC) length in each sub-district (cell) in system all is 256 chips, and launches once in each time slot (TS).SSC Secondary Synchronisation Code comprises a sequence of being made up of 15 second synchronous codes (SSC), and wherein the length of each synchronous code in each frame all is 256 chips.Shown in row on Fig. 1, under the symmetry time slot allocation pattern, each measurement window a and b are very short, and each measurement window can only obtain two adjacent SSC Secondary Synchronisation Codes at most, thereby it is next synchronous with FDD to can not get enough positions (timing) information, and handover success rate is lower.Yet if adopt " asymmetric time slot allocation pattern ", that is, contain two subframes of a strange idol in each frame, the down channel of even number subframe is distributed in time slot TS0, and up channel still is distributed in time slot TS1; The down channel of strange subframe is distributed in the time slot TS4 that follows second switching point closely, and up channel is distributed in the time slot TS3 before second switching point.In a frame, constitute asymmetric time slot allocation pattern thus.Like this, the length of measurement window A heightens, and can utilize all idle time slots wherein to carry out synchronous monitoring.The simulation result of record shows in Tdoc R1-02-1424 Comparison of asymmetricpattern and conventional scheme used for different measurement purpose-Rev.3 (Revision of R1-02-1274), obtain 225 PSC or 225 SSC reach to FDD synchronously, be 748.6ms maximum lock in time under traditional time slot allocation pattern, and only be 374.1ms maximum lock in time under the asymmetric time slot allocation pattern.Therefore reach a conclusion, the subscriber equipment of 1.28Mcps TDD can successfully monitor and realize FDD synchronously.
With " different time-gap assign group syntype " is example, subscriber equipment when a tdma system, when for example the subscriber equipment of 1.28Mcps TDD (UE) is prepared to switch to 3.84Mcps TDD system, should shift to an earlier date synchronous with it, for this reason, first synchronizing channel (primary SCH) that this subscriber equipment can be monitored 3.84Mcps TDD system to be obtaining its time slot position (timing), and monitors its SSC Secondary Synchronisation Code (secondary SCH) to obtain frame position (frametiming).Synchronous channel SCH and Primary Common Control Physical Channel P-CCPCH in 3.84Mcps TDD (primary common control physical channel) have two kinds of allocation models:
First kind of pattern: SCH and P-CCPCH are distributed in time slot TS#k, k=0, and 1 ..., 14;
Second kind of pattern: SCH is distributed in two time slots (TS), TS#k and TS#k+8, and k=0,1 ..., 6, and P-CCPCH is distributed among the TS#k.
Fig. 2 represents to utilize above-mentioned " different time-gap assign group syntype " to monitor the middle synchronizing channel 1 of contiguous 3.84McpsTDD sub-district and the situation of Primary Common Control Physical Channel 2, wherein, and the detected channel in the frame of two 3.84McpsTDD of last row's expression; Less measurement window in the subframe of 1.28McpsTDD under the symmetrical time slot allocation pattern of middle row's expression; Big measurement window in the subframe of 1.28McpsTDD under following row's expression " different time-gap assign group syntype ".Shown in row among the figure, under symmetrical time slot allocation pattern, because 1, the down channel of the subscriber equipment of 28McpsTDD is aimed at synchronizing channel to be measured, can't monitor the 3.84McpsTDD system in each measurement window.And " the different time slot allocation integrated modes " of arranging down among the figure are meant that the Traffic Channel of 1.28McpsTDD is reallocated frame by frame by predetermined time slot allocation layout, and periodic cycle, first and third, five ... the time slot allocation of the subframe of frame is identical, the second, four, six ... the time slot allocation of the subframe of frame is identical, but with first and third, five ... the frame difference.For example up channel is distributed in time slot TS3 in two of first frame subframes, and downlink communication channel is distributed in time slot TS4.Up channel is distributed in time slot TS1 in two subframes of second frame, and down channel is distributed in time slot TS6.Like this, different time slot allocation forms are combined to simultaneously, the measurement window that idle time slot between the Traffic Channel is formed obviously extends, can solve 1, the difficult problem that the subscriber equipment of 28McpsTDD is monitored the synchronizing channel of 3.84McpsTDD, synchronously possibility of success is promoted to more than 97.5% (referring to 3G TR 25.888 v 1.1.0http: ∥ www.3GPP.org) from 40%-60%.
Yet simulation result also shows, even adopt asymmetric time slot allocation pattern and different time-gap assign group syntype, can not 100% ground guarantees the synchronizing channel of 3.84Mcps TDD is carried out the detection of success.The problem that is occurred during user equipment monitors 3.84McpsTDD sub-district that Fig. 3 expresses 1.28Mcps TDD in the prior art, wherein, synchronizing channel 1 and Primary Common Control Physical Channel 2 under the aforementioned second kind of pattern of last row's expression in two frames of 3.84McpsTDD system, the measurement window in the subframe of following row's expression 1.28McpsTDD.If the time slot position of 3.84Mcps TDD synchronizing channel is as shown in Figure 3, then can't measuring to 3.84Mcps TDD with the subscriber equipment of 1.28Mcps TDD.Reason is, required minimum measurement window is that (T is switching time to 2*T+0.067ms when synchronous with 3.84Mcps TDD, T=0.5ms for example,), synchronous monitoring will take three all ascending time slot TS1-TS3, at this moment, even adopt asymmetric time slot allocation pattern or different time-gap assign group syntype, also do not have idle time slot facing to synchronizing channel, the subscriber equipment of 1.28Mcps TDD can't be monitored 3.84Mcps TDD.Another defective of these two kinds of patterns is to need the signaling support, and signaling consumption is bigger, may produce some negative effects to system.
The subscriber equipment of 1.28Mcps TDD to GSM or other 1.28Mcps TDD system when monitoring synchronously, also have similarly limitation.The minimum measurement window synchronously required with GSM is 2*T+0.577ms (T is switching time, for example T=0.5ms).The minimum measurement window synchronously required with other 1.28Mcps TDD is 2*T+0.075ms (for example T=0.5ms).In above-mentioned improved monitoring method, still can not provide the length of enough measurement window.
(3) summary of the invention
The method that the purpose of this invention is to provide a kind of improved expansion measurement window before the subscriber equipment and the switching of other communication system of TDMA, is used for overcoming the limitation of the method for prior art to monitoring between frequency or between system.Above-mentioned purpose of the present invention is to be realized by the method for claim 1, promptly, in time division multiple access (TDMA) communication system, enlarge the method for measurement window, be used to detect wireless access technology (RAT) system and/or be used for monitoring between frequency or between system, wherein: the subscriber equipment of tdma system all adopts discontinuous Resources allocation element method to speech and data communication, the business datum of a frame or subframe is put in the frame that is adjacent or the subframe receives and transmission, thereby the Resource Unit (RU) of this frame or this subframe vacated do not do to receive and transmission, the Resource Unit that this is vacated and adjacent those idle time slots combine, and constitute the measurement window that detects usefulness for subscriber equipment.
Above-mentioned tdma system is meant 1.28Mcps TDD, 3.84Mcps TDD, 7.68Mcps TDD, any in the systems such as GSM.
According to an aspect of the present invention, a kind of tdma system, the subscriber equipment that is 1.28Mcps TDD system all adopts discontinuous Resources allocation element method to speech and data communication, the method of salary distribution of channel resource is: the data of even number subframe are put into reception and transmission in the odd number subframe that is adjacent, perhaps, the data with the odd number subframe are put into reception and transmission in the even number subframe that is adjacent.What adopt here is that discontinuous Resources allocation unit (Resource Unit is called for short RU) technology enlarges measurement window.Discontinuous Resources allocation unit (RU) technology is former to be applied to the data communication of tdma system but not voice communication, mean, the data of transmission are allocated on the Resource Unit in the time slot of each frame, referring to 3GPP technical report TR25.22X (http://www.3GPP.org provides and browses and download) discontinuously.The present invention is introduced into voice communication first, is used to enlarge measurement window.
According to another aspect of the present invention, the monitoring between said system is meant between the subscriber equipment of one and one 1.28Mcps TDD in FDD system, gsm system, 3.84Mcps TDD system, the 1.28Mcps TDD system to reaching the monitoring of carrying out synchronously.
According to another aspect of the invention, another kind of tdma system, the subscriber equipment that is 3.84Mcps TDD system all adopts discontinuous Resources allocation element method to speech and data communication, the method of salary distribution of channel resource unit is: the data of former frame are put into reception and transmission in the back frame that is adjacent, perhaps, the data with back one frame are put into reception and transmission in the former frame that is adjacent.
According to a further aspect of the invention, above-mentioned subscriber equipment for example is a mobile phone, personal digital assistant (PAD) or possess the notebook computer or the similar device of function of cellular phone.
The channel resource allocation method that the TDMA subscriber equipment is identical with data communication to the voice communication employing, it is discontinuous Resources allocation unit, data centralization is received in some frame or subframe and transmits, and allow the Resource Unit of other frames or subframe vacate, increased the length of measurement window greatly.Design of the present invention is to allow the TDMA subscriber equipment utilize these not have to receive and subframes of transmission increase the yardstick of detection window, scanning and other contiguous communication system of monitoring, and for example the synchronizing channel of 3.84Mcps TDD system reaches synchronous before switching.
(4) description of drawings
For a better understanding of the present invention, now engage accompanying drawing and introduce some embodiments of the present invention.Wherein
Fig. 1 represents in the prior art comparison of measurement window length between symmetry and the asymmetric time slot allocation pattern.
Fig. 2 represents the subscriber equipment utilization of 1.28Mcps TDD in the prior art " different time-gap assign group syntype " synchronizing channel of monitoring 3.84Mcps TDD system.
The problem that is occurred during user equipment monitors 3.84McpsTDD sub-district that Fig. 3 expresses 1.28McpsTDD in the prior art.
Fig. 4 represents that the present invention adopts discontinuous Resources allocation unit (RU) to enlarge measurement window, to second kind of situation that the channel allocation pattern is monitored of 3.84McpsTDD.
(5) embodiment
What adopt in 1.28Mcps TDD communication system according to one embodiment of present invention, is that discontinuous Resources allocation unit (RU) enlarges measurement window.
Fig. 4 represents one embodiment of the present of invention, adopt discontinuous Resources allocation unit (RU) to enlarge measurement window, the situation that the synchronizing channel of 3.84McpsTDD is monitored, wherein, last row represents two frames of 3.84McpsTDD system, and its synchronizing channel 1 and Primary Common Control Physical Channel 2 are in second kind of pattern; The measurement window of two frames (four subframes) of 1.28McpsTDD under the symmetrical time slot allocation pattern of middle row's expression; In the following row expression embodiments of the invention, utilize discontinuous Resource Unit (RU) distribution technique to distribute Resource Unit in the time slot in the subframe of 1.28McpsTDD, the measurement window A that enlarges markedly of Xing Chenging thus.Row among the figure, 1.28McpsTDD symmetry time slot allocation pattern is that channel distributes symmetrically in each frame, all be in seizure condition with the corresponding descending time slot of the synchronizing channel of 3.84McpsTDD this moment, can't detect the SCH of 3.84McpsTDD efficiently and accurately.In the embodiment of the invention, 1.28Mcps the subscriber equipment of TDD adopts same discontinuous Resources allocation unit (RU) to speech and data communication, the business datum of all odd number subframes is received by the even number subframe and transmit, each even number subframe all has twice four Traffic Channels on two, and all channel/resources unit, the time slot of odd number subframe all free out, do not receive and transmission, thereby constitute the measurement window A that a length surpasses a subframe, carry out monitoring in order to base station to the 3.84McpsTDD communication system.Although required minimum measurement window was 2*T+0.067ms (T is switching time, for example T=0.5ms) when 3.84Mcps TDD was synchronous, from figure, can know and see have sufficiently long measurement window to finish scanning and testing.Thereby eliminated substantially and detected error, success rate almost remains on perfect level synchronously.After synchro measure was finished, the resource unit allocation mode of each frame can recover normal.
In another embodiment of the present invention, 1.28McpsTDD subscriber equipment speech and data communication is adopted discontinuous Resources allocation unit (RU), the professional number of all even number subframes is transmitted by the odd number subframe, each odd number subframe all has twice four channels on two, and all channel/resources unit, the time slot of each even number subframe all free out, thereby constitute the measurement window that a length surpasses a subframe, carry out monitoring in order to base station to the 3.84McpsTDD communication system.
The front with 1.28McpsTDD's and the synchronous monitoring between 3.84McpsTDD be example, the use of discontinuous Resources allocation unit (RU) technology aspect expansion 1.28McpsTDD measurement window yardstick has been described, based in like manner, the introducing of this technology, the subscriber equipment that makes 1.28McpsTDD with the synchronous monitoring of FDD system in, performance is same outstanding.Difference is that at this moment, in measurement window, what subscriber equipment will scan and monitor is first and second synchronizing channels (PSCH and SSCH) of FDD system.
Based in like manner, in another embodiment of the present invention, the introducing of discontinuous Resources allocation unit (RU) technology has enlarged the measurement window yardstick, the subscriber equipment that also makes 1.28McpsTDD with the synchronous monitoring of gsm system in, performance is same outstanding.Difference is that at this moment, what subscriber equipment will scan and monitor in measurement window is the frequency correction channel FCCH (frequency correction channel) and the synchronizing channel of gsm system.
Equally, in an embodiment more of the present invention, the introducing of discontinuous Resources allocation unit (RU) technology has enlarged the measurement window yardstick, the subscriber equipment that also makes 1.28McpsTDD with the synchronous monitoring of the 1.28McpsTDD system of other frequency in, performance is same outstanding.Difference is that at this moment, in measurement window, that subscriber equipment will scan and monitor is the downlink pilot frequency channel DwPCH (downlink pilot channel) of this other 1.28McpsTDD system.
According to still another embodiment of the invention, in another kind of tdma communication system, that is, the subscriber equipment of 3.84Mcps TDD communication system adopts discontinuous Resources allocation monotechnics to enlarge measurement window.
3.84Mcps every frame of TDD is 10 milliseconds, is divided into 15 time slots (TS0 is to TS14), generally speaking, the uplink and downlink channel respectively takies a time slot, and the idle time slot of those between the adjacent uplink and downlink can be used for carrying out and measure.In this embodiment of the present invention, adopt discontinuous Resources allocation monotechnics, 3.84Mcps the subscriber equipment of TDD system all adopts discontinuous Resources allocation element method to speech and data communication, the method of salary distribution of channel resource unit is: the data of former frame are put into reception and transmission in the back frame that is adjacent, perhaps, the data of back one frame are put into reception and transmission in the former frame that is adjacent, thereby the Resource Unit in the time slot of some frame is vacated, with other time slots, constitute the measurement window that a length surpasses a frame, carry out monitoring in order to base station to another adjacent communication system.
To other tdma communication systems, as 7.68Mcps TDD, GSM etc. all can enlarge measurement window by said method according in like manner, repeat no more
The present invention is incorporated into discontinuous Resources allocation unit (RU) technology the synchro measure process between communication system first, with all up to now prior art method (comprise " asymmetric time slot allocation pattern " with " different time-gap assign group syntype ") compare, the resulting period that can be used between frequency and test between system of the inventive method (gap) obviously strengthens, the quantity of available idle time slot significantly improves, scan and detect the synchronizing channel of other communication system whereby, the subscriber equipment that has increased tdma system greatly carries out between frequency and the success rate of the detection between system to other contiguous communication system.Adopt method of the present invention to enlarge measurement window simultaneously, for tdma system without any negative effect.
Claims (9)
1, in time division multiple access (TDMA) communication system, enlarge the method for measurement window, be used to detect wireless access technology (RAT) system and/or be used for monitoring between frequency or between system, wherein: the subscriber equipment of tdma system all adopts discontinuous Resources allocation element method to speech and data communication, the business datum of a frame or subframe is put in the frame that is adjacent or the subframe receives and/or transmission, thereby the Resource Unit in this frame or this subframe vacated do not do to receive and transmission, the time slot at the Resource Unit place that this is vacated and adjacent those idle time slots combine, and constitute the measurement window that detects usefulness for subscriber equipment.
2, the method for claim 1 is characterized in that: above-mentioned tdma system is meant 1.28Mcps TDD, 3.84Mcps TDD, 7.68Mcps TDD, any among the GSM.
3, method as claimed in claim 2 is characterized in that: the data with the even number subframe in the subscriber equipment of 1.28Mcps TDD system are put into reception and transmission in the odd number subframe that is adjacent.
4, method as claimed in claim 2 is characterized in that: the data with the odd number subframe in the subscriber equipment of 1.28Mcps TDD system are put into reception and transmission in the even number subframe that is adjacent.
5, as claim 3 or 4 described methods, it is characterized in that: the monitoring between said system is meant between the subscriber equipment of one and one 1.28Mcps TDD system in FDD system, gsm system, 3.84Mcps TDD system, the 1.28Mcps TDD system to reaching the monitoring of carrying out synchronously.
6, as the described method of one of claim 1 to 4, it is characterized in that: above-mentioned subscriber equipment is a mobile phone.
7, method as claimed in claim 2 is characterized in that: the data with former frame in the subscriber equipment of 3.84Mcps TDD system are put into reception and transmission in the back frame that is adjacent.
8, method as claimed in claim 2 is characterized in that: the data with back one frame in the subscriber equipment of 3.84Mcps TDD system are put into reception and transmission in the former frame that is adjacent.
9, as claim 7 or 8 described methods, it is characterized in that: above-mentioned subscriber equipment is a mobile phone.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009049539A1 (en) * | 2007-10-12 | 2009-04-23 | Huawei Technologies Co., Ltd. | A call method and equipment |
| CN101351028B (en) * | 2007-07-19 | 2011-10-26 | 中兴通讯股份有限公司 | Method and apparatus for down discontinuousness voice transmission base on IP Abis interface |
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2003
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101351028B (en) * | 2007-07-19 | 2011-10-26 | 中兴通讯股份有限公司 | Method and apparatus for down discontinuousness voice transmission base on IP Abis interface |
| WO2009049539A1 (en) * | 2007-10-12 | 2009-04-23 | Huawei Technologies Co., Ltd. | A call method and equipment |
| CN101409597B (en) * | 2007-10-12 | 2011-04-13 | 华为技术有限公司 | Talking method and apparatus |
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