CN102318415B - Facilitating uplink synchronization in TD-SCDMA multi-carrier systems - Google Patents
Facilitating uplink synchronization in TD-SCDMA multi-carrier systems Download PDFInfo
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Abstract
Uplink synchronization processes in multi-carrier time division-synchronous code division multiple access (TD-SCDMA) systems include determining uplink transmission timing for a first carrier frequency and performing uplink synchronization on the other carrier frequencies based on the transmission timing of the first carrier frequency. The transmission timing may be adjusted based on a timing offset that is measured between the received downlink pilot signals of the various carrier frequencies. User equipment may perform uplink synchronization individually with each of the carriers serviced by a particular Node B after receiving synchronization information regarding those carrier frequencies.
Description
The cross reference of related application
The application require to advocate on April 7th, 2010 that submit to, that application number is 61/321,680, with the priority of the U.S. Provisional Patent Application of the people's such as CHIN name application, the mode that the disclosure of this application is quoted in full is clearly incorporated to the application.
Technical field
Put it briefly, some aspects of the application relate to wireless communication system, and more specifically, relate to the uplink synchronisation promoting in TD-SCDMA multicarrier system.
Background technology
Cordless communication network is disposed to provide the various communication services such as speech, video, data, message send, broadcast widely.Normally multi-access network of these networks, it can support the communication for multiple users by sharing available Internet resources.An example of this class network is universal land radio access web (UTRAN).UTRAN is the wireless access network (RAN) that is defined as a part for Universal Mobile Telecommunications System (UMTS), and UMTS is the third generation (3G) mobile phone telephony of being supported by third generation partner program (3GPP).As the successor of global system for mobile communications (GSM) technology, UMTS supports at present such as broadband-code division multiple access (W-CDMA), TD-CDMA Time Division-Code Division Multiple Access (TD-CDMA) and the so various air-interface standards of Time Division-Synchronous Code Division Multiple Access (TD-SCDMA).For example, China is utilizing its existing GSM infrastructure to carry out TD-SCDMA as the basic air interface in UTRAN framework as core net.UMTS also supports the enhancement mode 3G data communication protocol such as high-speed downlink packet access (HSPDA), and HSPDA provides higher data transmission bauds and data transmission capacity for the UMTS network being associated.
Along with the sustainable growth to mobile broadband access demand, be not only in order to meet the growing demand to mobile broadband access, be also to use the user of mobile communication to experience in order to promote and to strengthen, research and development continues promoting the progress of UMTS technology.
Summary of the invention
Aspect of the application, method for the uplink synchronisation of multi-carrier TD-SCDMA system comprises: determine the uplink transmit timing for the first frequency in described multi-carrier TD-SCDMA system, and at least one the auxiliary frequency in described multi-carrier TD-SCDMA system, carry out uplink synchronisation based on determined described uplink transmit timing.It should be noted in the discussion above that the object for the application, term " auxiliary frequency " means other frequency, instead of is intended to express the hierarchical relationship of any type of itself and described first frequency.
Aspect the application's another one, a kind of subscriber equipment is configured to carry out uplink synchronisation in multi-carrier TD-SCDMA system.This subscriber equipment comprises: for determining the module for the uplink transmit timing of the first frequency of described multi-carrier TD-SCDMA system, and for carry out the module of uplink synchronisation at least one auxiliary frequency of described multi-carrier TD-SCDMA system based on determined described uplink transmit timing.
Aspect the application's another one, a kind of computer program has the computer-readable medium of the code that has program stored therein on it.This program code comprises: for determining the code for the uplink transmit timing of the first frequency of described multi-carrier time-division synchronous code division multiple access (TD-SCDMA) system, and for carry out the code of uplink synchronisation at least one auxiliary frequency of described multi-carrier TD-SCDMA system based on determined described uplink transmit timing.
Aspect the application's another one, a kind of subscriber equipment is configured to the radio communication for multi-carrier TD-SCDMA system.This subscriber equipment comprises at least one processor and is coupled to the memory of described processor.Described processor is configured to determine the uplink transmit timing for the first frequency in described multi-carrier TD-SCDMA system, and at least one the auxiliary frequency in described multi-carrier TD-SCDMA system, carries out uplink synchronisation based on determined described uplink transmit timing.
Aspect the application's another one, a kind of method of the uplink synchronisation for multi-carrier time-division synchronous code division multiple access (TD-SCDMA) system comprises: send the synchronizing information for each frequency in multiple carrier frequencies of being served by described Target cell to Target cell.Described synchronizing information is received from cell-of-origin by subscriber equipment.Described method further comprises: receive physical access channel (FPACH) confirmation signal (ACK) with each frequency dependence connection, obtain the single transmit timing value for each frequency from received described FPACH ACK, and in each carrier frequency in described multiple carrier frequencies of being served by described Target cell, carry out uplink synchronisation individually.
Aspect the application's another one, a kind of subscriber equipment is configured to the uplink synchronisation for multi-carrier TD-SCDMA system.This subscriber equipment comprises: for the module for the synchronizing information of each frequency of multiple carrier frequencies of being served by described Target cell to Target cell transmission, described synchronizing information receives from cell-of-origin, for receiving the module of the FPACH ACK joining with each frequency dependence, for obtaining the module for the single transmit timing value of each carrier frequency from received described FPACH ACK, and for carry out individually the module of uplink synchronisation in each carrier frequency of being served by described Target cell.
Aspect the application's another one, a kind of computer program has the computer-readable medium of the code that has program stored therein on it.This program code comprises: for the code for the synchronizing information of each frequency of multiple carrier frequencies of being served by described Target cell to Target cell transmission, described synchronizing information receives from cell-of-origin, for receiving the code of the FPACH ACK joining with each frequency dependence, for obtaining the code for the single transmit timing value of each frequency from received described FPACH ACK, and for carry out individually the code of uplink synchronisation in each carrier frequency of being served by described Target cell.
Aspect the application's another one, a kind of subscriber equipment is configured to the radio communication for multi-carrier TD-SCDMA system.This subscriber equipment comprises at least one processor and is coupled to the memory of described processor.Described processor is configured to send to Target cell the synchronizing information for each frequency in multiple carrier frequencies of being served by described Target cell.Described synchronizing information is received from cell-of-origin by subscriber equipment.Described subscriber equipment is also configured to: receive the FPACH ACK with each frequency dependence connection, obtain the single transmit timing value for each frequency from received described FPACH ACK, and in each carrier frequency of being served by described Target cell, carry out uplink synchronisation individually.
Brief description of the drawings
Fig. 1 is the block diagram that the example of telecommunication system is conceptually shown.
Fig. 2 is the block diagram that the example of the frame structure in telecommunication system is conceptually shown.
Fig. 3 is the block diagram that is conceptually illustrated in the example of the Node B communicating with subscriber equipment (UE) in telecommunication system.
Fig. 4 is the block diagram that the carrier frequency in multi-carrier TD-SCDMA communication system is shown.
Fig. 5 is the functional block diagram that the exemplary block that is performed an embodiment who realizes the application is shown.
Fig. 6 is the signal flow graph in the multi-carrier TD-SCDMA communication system configuring according to the application aspect.
Fig. 7 is the signal flow graph in the multi-carrier TD-SCDMA communication system configuring according to the application aspect.
Fig. 8 shows the call flow diagram of the call flow during the direct-cut operation in the TD-SCDMA system configuring according to the application aspect.
Embodiment
Be intended to as the description to various configurations below in conjunction with the given detailed description of accompanying drawing, and be not intended to represent to realize only configuration of concept described herein.For the object of the thorough understanding to each conception of species is provided, describe in detail and comprised detail.But, to those skilled in the art, be apparent that, also can not realize these concepts by these details.In some cases, illustrate that by the form of block diagram known structure and assembly are fuzzy to avoid these concepts to cause.
Forward now Fig. 1 to, it has shown the block diagram of the example that telecommunication system 100 is shown.Running through the given each conception of species of the application can realize in various telecommunication systems, the network architecture and communication standard.As an example instead of limit, the various aspects of the application shown in Fig. 1 are that the UMTS system of consulting and using TD-SCDMA standard provides.In this example, UMTS system comprises RAN (wireless access network) 102 (for example, UTRAN), and it provides the various wireless services that comprise speech, video, data, message transmission, broadcast and/or other service.RAN 102 can be divided into multiplely such as the such wireless network subsystem (RNS) of RNS 107, each RNS is by controlling such as the such radio network controller of RNC106 (RNC).For the sake of clarity, only show RNC 106 and RNS 107; But except RNC 106 and RNS 107, RAN 102 can comprise RNC and the RNS of arbitrary number.Except the other side of RNC 106, RNC 106 or a kind of responsible distribution, reconfigure and discharge the device of the Radio Resource in RNS 107.RNC 106 can use any suitable transmission network by the various types of interfaces such as direct physical connection, virtual net etc. and other RNC (not shown) interconnection in RAN 102.
The geographic area being covered by RNS 107 can be divided into multiple communities, wherein uses wireless transceivers devices to provide service to each community.Wireless transceivers devices is commonly called Node B (Node B) in UMTS application, but also may be called base station (BS), base transceiver station (BTS), wireless base station, transceiver, transceiver function body, Basic Service Set (BSS), extended service set (ESS), access point (AP) or certain other suitable term by those skilled in the art.For the sake of clarity, show two Node B 108; But RNS 107 can comprise the radio node B of arbitrary number.The mobile device that Node B 108 is arbitrary number is provided to the WAP (wireless access point) of core net 104.The example of mobile device comprises cell phone, smart phone, Session initiation Protocol (SIP) phone, kneetop computer, notebook, net book, intelligence basis, personal digital assistant (PDA), satellite radio devices, global positioning system (GPS) equipment, multimedia equipment, video equipment, digital audio-frequency player (for example, MP3 player), camera, game machine or any other similar function device.Mobile device is commonly called subscriber equipment (UE) in UMTS application, but also may be called mobile radio station (MS), subscriber station, mobile unit, subscriber unit, radio-cell, remote unit, mobile device, wireless device, Wireless Telecom Equipment, remote equipment, mobile subscriber station, access terminal (AT), mobile terminal, wireless terminal, remote terminal, cell-phone, terminal, user agent, mobile client, client or certain other suitable term by those skilled in the art.For illustrative object, show 3 UE 110 that communicate with Node B 108.Down link (DL) (being also referred to as forward link) refers to the communication link from Node B to UE, and up link (UL) (being also referred to as reverse link) refers to the communication link from UE to Node B.
Core net 104 as shown in the figure comprises GSM core net.But as skilled in the art will recognize, running through the given each conception of species of the application can realize in RAN or other suitable Access Network, so that the access of the core net of going to some types except GSM network to be provided to UE.
In this example, core net 104 is used mobile switching centre (MSC) 112 and gateway MSC (GMSC) 114 to carry out support circuit-switched service.One or more RNC (for example, RNC 106) can be connected to MSC 112.MSC 112 is a kind of devices that call setup, call routing and UE mobility functions are controlled.MSC 112 also comprises Visited Location Registor (VLR) (not shown), user related information when VLR comprises during UE is positioned at the overlay area of MSC 112.GMSC 114 provides the gateway of place in circuit switching network 116 by MSC 112 for UE.GMSC 114 comprises attaching position register (HLR) (not shown), and HLR comprises the user data such as the data of the details of the reflection specific user service of having subscribed to.HLR is also associated with the authentication center (AuC) comprising specific to user's verify data.When receive for particular UE calling time, GMSC 114 inquires that HLR is to determine the position of this UE, and this calling is forwarded to the specific MSC that service is provided to this position.
Core net 104 is also used Serving GPRS Support Node (SGSN) 118 and Gateway GPRS Support Node (GGSN) 120 to support packet data service.Compared with serving those available speed with the GSM circuit switched data of standard, GPRS (expression general packet radio service) is designed to provide packet data service with higher speed.GGSN 120 provides the connection of going to packet-based network 122 for RAN 102.Packet-based network 122 can be internet, exclusive data networking or certain other suitable packet-based network.The major function of GGSN 120 is to provide packet-based network connectivty for UE 110.By SGSN 118 transmission of data packets between GGSN 120 and UE 110, SGSN 118 is main in packet-based territory carries out the function identical with MSC 112 performed function in circuit commutative field.
UMTS air interface is spread spectrum direct sequence CDMA (DS-CDMA) system.Spread spectrum DS-CDMA is by multiplying each other user data is launched in wider bandwidth being called as the PRBS pseudo-random bit sequence of chip and user data.TD-SCDMA standard is based on this direct sequence spread spectrum skill, and requires in addition time division duplex (TDD), instead of as the FDD using in the UMTS/W-CDMA system of many Frequency Division Duplexing (FDD) (FDD) pattern.TDD uses identical carrier frequency for the up link (UL) between Node B 108 and UE 110 and down link (DL), but ul transmissions and downlink transmission are divided into the different time-gap in this carrier wave.
Fig. 2 shows the frame structure 200 for TD-SCDMA carrier wave.As shown in the figure, to have length be the frame 202 of 10 milliseconds to TD-SCDMA carrier wave.Frame 202 has the subframe 204 of two 5 milliseconds, and each subframe 204 comprises 7 time slot TS0 to TS6.First time slot TS0 is allocated for downlink communication conventionally, and second time slot TS1 is allocated for uplink communication conventionally.Remaining time slot (TS2 is to TS6) both can also can be for down link for up link, and this makes to allow greater flexibility period in the higher data transmission upwards of up link or downlink side.Down link pilot timeslot (DwPTS) 206 (being also referred to as downlink (DwPCH)), protective time slot (GP) 208 and uplink pilot time slot (UpPTS) 210 (being also referred to as uplink pilot channel (UpPCH)) are between TS0 and TS1.TS0 can allow multiplexing transfer of data on maximum 16 code channels to the each time slot in TS6.Transfer of data on code channel comprises two data divisions 212 that separated by middle leading code 214 and is followed by thereafter protective time slot (GP) 216.Middle leading code 214 can be for the characteristic such as channel estimating, and GP 216 can be for avoiding the interference (inter-burst interference) between burst.
Fig. 3 is the block diagram of the Node B 310 that communicates with UE 350 in RAN 300, and wherein, RAN 300 can be the RAN 102 in Fig. 1, and Node B 310 can be the Node B 108 in Fig. 1, and UE 350 can be the UE 110 in Fig. 1.In downlink communication, transmitting processor 320 can receive data and from controller/processor 340 reception control signals from data source 312.Transmitting processor 320 provides for example, various signal processing functions for data and control signal and reference signal (, pilot signal).For example, transmitting processor 320 can be provided for cyclic redundancy check (CRC) (CRC) code of error-detecting, for example, for promoting the coding of forward error correction (FEC) and interweaving, based on various modulation schemes (, two-phase PSK (BPSK), quarternary phase-shift keying (QPSK) (QPSK), M phase phase shift keying (M-PSK) and M level quadrature amplitude modulation (M-QAM) etc.) the mapping to signal constellation (in digital modulation), use the spread spectrum that carries out of Orthogonal Variable Spreading Factor OVSF (OVSF), and be multiplied by mutually and generate a series of symbol with scrambled code.Can be used to determine by controller/processor 340 coding, modulation, spread spectrum and/or the scrambling scheme of transmitting processor 320 from the channel estimating of channel processor 344.The reference signal that these channel estimating can be launched from UE 350, obtain, or obtain from the feedback from comprising in leading code 214 (Fig. 2) UE 350.The symbol being produced by transmitting processor 320 is provided for frame emission processor 330 to create frame structure.Frame emission processor 330 is by symbol and the middle leading code 214 (Fig. 2) of carrying out self-controller/processor 340 being carried out to multiplexingly create this frame structure, thereby produces a series of frame.These frames are provided for transmitter 332 subsequently, and this transmitter 332 provides and comprises amplification, filtering and these frames are modulated on carrier wave for carrying out downlink transmission by smart antenna 334 in interior various signal conditioning functions on wireless medium.Smart antenna 334 can be realized with wave beam control bidirectional self-adaptive aerial array or other similar beam technique.
At UE 350 places, receiver 354 is by antenna 352 receiving downlinks transmission, and processes this and transmit to recover to be modulated at the information on carrier wave.The information of being recovered by receiver 354 is provided for received frame processor 360, received frame processor 360 is resolved each frame and middle leading code 214 (Fig. 2) is offered to channel processor 394, and data-signal, control signal and reference signal are offered to receiving processor 370.Then, receiving processor 370 is carried out the contrary processing of the processing performed with transmitting processor 320 in Node B 310.More particularly, receiving processor 370 carries out descrambling and despreading to symbol, and determines the most possible signal constellation point being sent by Node B 310 based on modulation scheme subsequently.These soft-decisions can be based on being calculated by channel processor 394 channel estimating.Decoded and the deinterleaving subsequently of these soft-decisions is to recover data-signal, control signal and reference signal.Then, check (CRC) codes is to determine whether these frames are successfully decoded.The data entrained by the frame of successfully decoding will be provided for data sink 372 subsequently, and this data sink 372 represents just to operate in application program and/or the various user interface (for example, display) in UE 350.The control signal entrained by the frame of successfully decoding will be provided for controller/processor 390.In the time that the not received machine processor 370 of frame is successfully decoded, controller/processor 390 can also use confirmation (ACK) and/or Negative Acknowledgement (NACK) agreement to support the repeat requests to those frames.
In up link, be provided for transmitting processor 380 from data and the control signal of carrying out self-controller/processor 390 of data source 378.Data source 378 can represent just operating in application program and the various user interface (for example, keyboard, pointing device, orbit wheel etc.) in UE 350.Be similar in conjunction with the described function of downlink transmission of being undertaken by Node B 310, transmitting processor 380 provides various signal processing functions, comprising: CRC code, contribute to the coding of FEC and the spread spectrum that interweaves, carry out to the mapping of signal constellation (in digital modulation), use OVSF and scrambling to produce a series of symbol.The channel estimating that feedback that obtain from the reference signal of being launched by Node B 310 by channel processor 394 or that comprise in leading code from launched by Node B 310 obtains can be for selecting suitable coding, modulation, spread spectrum and/or scrambling scheme.The symbol being produced by transmitting processor 380 will be provided for frame emission processor 382 for creating frame structure.Frame emission processor 382 is by symbol and the middle leading code 214 (Fig. 2) of carrying out self-controller/processor 390 being carried out to multiplexingly create this frame structure, thereby produces a series of frame.These frames are provided for transmitter 356 subsequently, and transmitter 356 provides and comprises amplification, filtering and these frames are modulated on carrier wave for carrying out ul transmissions by smart antenna 352 in interior various signal conditioning functions on wireless medium.
At Node B 310 places, ul transmissions is processed in conjunction with the described mode of receiver function to be similar at UE 350 places.Receiver 335 is transmitted and is processed this by smart antenna 334 receiving uplinks and transmits to recover to be modulated at the information on carrier wave.The information of being recovered by receiver 335 is provided for received frame processor 336, received frame processor 336 is resolved each frame and middle leading code 214 (Fig. 2) is offered to channel processor 344, and data-signal, control signal and reference signal are offered to receiving processor 338.Receiving processor 338 is carried out the contrary processing of processing of carrying out with the transmitting processor 380 in UE 350.Be provided for respectively subsequently data sink 339 and controller/processor 340 by the entrained data-signal of the frame being successfully decoded and control signal.If the not received processor 338 of some frame is successfully decoded, controller/processor 340 can also use confirmation (ACK) and/or Negative Acknowledgement (NACK) agreement to support the repeat requests to those frames so.
Controller/processor 340 and controller/processor 390 can be respectively used to instruct the operation at Node B 310 and UE 350 places.For example, controller/processor 340 and controller/processor 390 can provide the various functions that comprise timing, peripheral interface, voltage adjustment, power management and other control function.The computer-readable medium of memory 342 and 392 can be stored respectively data and the software for Node B 310 and UE 350.For example, the memory 392 of UE 350 comprises auxiliary carrier synchronization assembly 393, the latter is configured to determine transmit timing information to UE 350 in the time being carried out by controller/processor 390, and this transmit timing information is for being synchronized to the auxiliary carrier frequency rate of multicarrier system from the uplink communication of UE 350.As mentioned above, for the application's object, term " auxiliary frequency " means another frequency or other frequency, instead of is intended to the hierarchical relationship of any type of expressing " auxiliary frequency " and other frequencies.Scheduler/the processor 346 at Node B 310 places can be used to the Resources allocation to UE, and scheduling is for downlink transmission and/or the ul transmissions of UE.
In it should be noted that aspect the application selected, the memory 342 of Node B 310 is also stored synchronizing information registration table 343, and the latter comprises the record for the synchronizing information of each carrier frequency in the carrier frequency of being served by Node B around.
For more capacity is provided, TD-SCDMA system can allow multi-carrier signal or multiple radio frequency.Suppose that N is the sum of carrier wave, carrier frequency can by set F (i), i=0,1 ..., N-1} represents, wherein, carrier frequency F (0) is that main carrier frequency and remaining are auxiliary carrier frequency rates.For example, Yi Ge community can have 3 carrier signals, thereby sends data on some yard of channel of the time slot on can a frequency of carrier signal in these 3 frequency of carrier signal.Fig. 4 shows the block diagram 40 of the carrier frequency in multi-carrier TD-SCDMA communication system.Multiple radio frequency comprises main carrier frequency 400 (F (0)) and multiple auxiliary carrier frequency rate, and wherein, the plurality of auxiliary carrier frequency rate comprises auxiliary 1401 and auxiliary N 402 (F (1) and F (2)).In these multicarrier systems, overhead can send on first time slot (TS0) of main carrier frequency 400, wherein, main carrier frequency 400 comprises Primary Common Control Physical Channel (P-CCPCH), auxiliary publish control physical channel (S-CCPCH) and pilot tone indicator channel (PICH) etc.Traffic Channel can be carried in the remaining time slots (TS1-TS6) of main carrier frequency 400 and auxiliary carrier frequency rate (auxiliary 1401 and auxiliary N 402).Therefore, in these configurations, UE will be on main carrier frequency 400 receiving system information and monitor for pages message, and one in main carrier frequency 400 and auxiliary carrier frequency rate (auxiliary 1401 and auxiliary N 402) or all on transmit and receive data.
DwPTS and UpPTS can be configured in main carrier frequency 400 and auxiliary carrier frequency rate (auxiliary 1401 and auxiliary N 402).But random access procedure can be carried out with main carrier frequency 400, can use the one or both in main carrier frequency 400 and auxiliary carrier frequency rate (auxiliary 1401 and auxiliary N 402) to carry out and switch process of uplink synchronization.
A function of UE in TD-SCDMA system is uplink synchronisation.The synchronous character of TD-SCDMA system makes can side by side be received at this Node B place from all uplink communications of the each UE just being served by specific Node B.UE carries out this uplink synchronisation in following two time periods by synchronization message and Timing measurement conventionally: initially access and switch.Between initial access periods, UE comes to receive timing information from Node B by the system information receiving via control channel and other system management channel.During handoff procedure, UE is first to Node B transmission uplink synchronisation (SYNC_UL) code and via FPACH (physical access channel) confirmation of receipt message (ACK), and wherein, this ACK indicates timing information.In response to this timing information, UE adjusts uplink transmit timing in the time that Traffic Channel is switched to Target cell.
Available uplink synchronisation code and FPACH information are indicated by source node B.But in multi-carrier TD-SCDMA, process of uplink synchronization may be more complicated-particularly in the time that UE has Dedicated Traffic Channel in more than one carrier frequency.In initial access situation, because control channel and other system management channel are positioned on main carrier frequency, so UE can carry out uplink synchronisation with main carrier frequency instead of auxiliary carrier wave.In addition,, for handoff procedure, TD-SCDMA standard is used single frequency to solve the problem of uplink synchronisation.Therefore, UE can not carry out uplink synchronisation with any channel being arranged in another frequency of Target cell.
Fig. 5 is the functional block diagram that the exemplary block that is performed an embodiment who realizes the application is shown.In square frame 500, determine the uplink transmit timing for the first frequency in multi-carrier TD-SCDMA system.In square frame 501, at least one the auxiliary frequency based on determined uplink transmit timing in multi-carrier TD-SCDMA system, carry out uplink synchronisation subsequently.Aspect this of the application, UE carries out uplink synchronisation in the carrier frequency of being indicated by Node B, and subsequently all carrier frequencies that will send uplink service is thereon applied to identical uplink transmit timing.
Of the application substituting aspect, can directly estimate for the timing slip of extra carrier wave and this timing slip is applied to the uplink synchronisation of all the other carrier frequencies.This substituting aspect, the timing slip of the DwPTS that receive of UE on can measuring frequency carrier wave F (j), and UE can be in the upper uplink synchronisation of carrying out of remaining frequency carrier F (k) subsequently, these remaining frequency carrier F (k) carry uplink traffic channel for UE.
In the process of measured timing slip that obtains the DwPTS receiving, in the time that the DwPTS on frequency carrier F (j) is received early than the DwPTS on remaining carrier frequency F (k), suppose that measured timing slip D (j, k) is greater than 0.So, should with as undefined extra deviant be adjusted at the uplink transmit timing on F (k):
T_adv(k)＝T_adv(j)+2*D(j，k) (1)
Wherein, T_adv (j) is by the time advance value that uses the FPACH ACK receiving to obtain when in the upper execution of carrier frequency F (j) process of uplink synchronization.T_adv (k) shifts to an earlier date (zero advancement) by assumed zero point to be based in the situation of the upper DwPTS receiving of identical carrier frequency F (k) and to derive according to formula (1).
Fig. 6 is the signal flow graph in the multi-carrier TD-SCDMA communication system 60 configuring according to the application aspect.Multi-carrier TD-SCDMA communication system 60 comprises UE 600, Node B carrier wave j 601 and Node B carrier wave k 602.During the time period shown in Fig. 6, UE 600 has carried out the uplink synchronisation with Node B carrier wave j 601, and has therefore received the uplink transmit timing for Node B carrier wave j 601.Because UE 600 can carry out uplink synchronisation with the single frequency of Node B carrier wave j 601, therefore the principle that uses formula (1) is determined the uplink transmit timing for Node B carrier wave k 602 by UE 600.
Due to the uplink synchronisation of Node B carrier wave j 601 is occurred, therefore UE 600 has known time advance value T_adv (j).Therefore,, in order to derive time advance value T_adv (k), for Node B carrier wave k 602, UE 600 will measure timing slip D (j, k).At moment 603 place, the DwPTS of Node B carrier wave j 601 and Node B carrier wave k 602 is sent to UE 600.UE 600 is at the DwPTS of the moment 604 receiving node B of place carrier wave j 601 and at the DwPTS of the moment 605 receiving node B of place carrier wave k 602.Delay between moment 604 and moment 605 has formed timing slip D (j, k).Therefore, when carry out scheduling uplink communication with Node B carrier wave k 602, UE 600 by the moment 607 place dispatch the transmission of its uplink communication, this moment 607 be D (j, k) for the timing slip sending between ul transmissions moment 608 of communicating by letter of Node B carrier wave j 601.
For the object of Fig. 6, be based on the upper DwPTS receiving of identical carrier frequency F (k) for the reference in advance at zero point of carrier frequency F (k).Can in the time period between moment 605 and moment 610, find out in advance the zero point for F (k), wherein, the moment 605 is UE 600 receives downlink communication moment from Node B carrier wave k 602.Can in the time period between moment 604 and moment 609, find out in advance the zero point for F (j), wherein, the moment 604 is UE 600 receives downlink communication moment from Node B carrier wave j601.For the time advance value T_adv (k) of Node B carrier wave k 602 can be regarded as by shift to an earlier date from zero point the moment 610 deduct time advance value T_adv (j) and moment 607 and 608 and the moment 609 and 610 between two timings that timing slip sum measures.Once UE 600 has determined time advance value T_adv (k), UE 600 can be synchronizeed its uplink communication with Node B carrier wave k 602 so.
It should be noted that aspect the application substituting, the zero point of carrier frequency F (k) in advance in fact can be based at the upper DwPTS receiving of carrier frequency F (j).Fig. 7 is the signal flow graph in the multi-carrier TD-SCDMA communication system 60 configuring according to the application aspect.Again, for the object of Fig. 7, uplink synchronisation completes between UE 600 and Node B carrier wave j 601.Therefore, received for the uplink transmit timing information of Node B carrier wave j 601.At moment 700 place, both send downlink transmission to UE 600 Node B carrier wave j 601 and Node B carrier wave k 602.UE 600 the moment 701 place from Node B carrier wave j 601 receiving downlink communications and in the moment 702 from Node B carrier wave k 602 receiving downlinks instructions.UE 600 measures time difference between moment 701 and moment 702 as timing slip D (j, k).In the time that scheduling uplink is communicated by letter, UE 600 the moment 704 place by the transmitting and scheduling of uplink communication to Node B carrier wave k 602 and the moment 705 place by the transmitting and scheduling of uplink communication to Node B carrier wave j 601.Difference between moment 704 and moment 705 equals timing slip D (j, k), and this timing slip D (j, k) is receiving measurement after down link instruction.Aspect describing at Fig. 7, zero point is in advance with reference to being positioned at now moment 706 place, and this zero point is in advance with reference to being shared by two carrier frequencies (F (j) and F (k)).Therefore, at leading-out needle, during to the time advance value T_adv (k) of Node B carrier wave k 602, calculating is since moment 706 place.By from identical reference point, referring to as undefined formula, only need on the basis of the time advance value T_adv (j) of Node B carrier wave j 601, increase single timing slip D (j, k):
T_adv(k)＝T_adv(j)+D(j，k) (2)
Therefore will be, to deduct for Node B carrier wave j 601 time advance value T_adv (j) and a timing slip D (j, k) sum with reference to the moment 706 for the time advance value T_adv (k) of Node B carrier wave k 602.Once determine the time advance value T_adv (k) for Node B carrier wave k 602, UE 600 just can be synchronizeed uplink communication with Node B carrier wave k 602 so afterwards.
It should be noted in the discussion above that about Fig. 6 and 7 described the application's various aspects to carry out leading-out needle the mode of uplink transmit timing of the Node B with different carrier frequencies is carried out to the uplink synchronisation in handoff procedure by being based in part on the known uplink transmit timing of Node B (using the uplink synchronisation of this uplink transmit timing to occur).But the application's other aspect can also be by providing the uplink synchronisation that the switching of Node B (these Node B have multiple carrier frequencies) is carried out from cell-of-origin receiving uplink synchronous code.
Fig. 8 is the call flow diagram of the call flow during the direct-cut operation in the TD-SCDMA communication system 80 configuring according to the application aspect.TD-SCDMA system 80 comprises UE 800, has the Node B 801 of single carrier frequency and has the Node B 802 of two carrier frequencies (Freq 1 and Freq 2).Start for the switching of UE 800, wherein, UE 800 will be switched to the have multiple carrier frequencies Node B 802 of (Freq 1 and Freq 2) from the single dedicated frequency of Node B 801.At 803 places, this handoff procedure sends physical channel and reconfigures message from Node B 801 to UE 800.This physical channel reconfigures message and comprises uplink synchronisation code and the FPACH for each carrier frequency of Node B 802.At 804 places, UE 800 above sends synchronous code to Node B 802 in each carrier frequency (Freq 1 and Freq 2).For the single uplink transmit timing information of Freq 1 and Freq 2 subsequently respectively the moment 805 and 806 place send it back UE 800 by Node B 802.Then, UE 800 can complete the uplink synchronisation of carrying out in each carrier frequency in carrier frequency Freq 1 and Freq 2 by this uplink transmit timing information, and the moment 807 place start to send uplink dedicated transport channels (DTCH).
In one configuration, UE comprises the module for the uplink transmit timing of definite first frequency for multi-carrier TD-SCDMA system, and for carry out the module of uplink synchronisation at least one auxiliary frequency of multi-carrier TD-SCDMA system based on determined uplink transmit timing.In one aspect, aforesaid module can be to be configured to carry out by the controller/processor 390 of the cited function of aforesaid module, that carry out and be stored in auxiliary carrier synchronization assembly 393, channel processor 394, antenna 352, receiver 354, received frame processor 360 and the receiving processor 370 in memory 392 by controller/processor 390.In yet another aspect, aforesaid module can be to be configured to carry out assembly or any device by the cited function of aforesaid module.
In another kind configuration, UE also comprises: for measuring the module of the timing slip in first frequency and any auxiliary frequency, and for carrying out the module of adjusting determined uplink transmit timing for the timing slip based on measured carry out the module of uplink synchronisation at least one auxiliary frequency before.In one aspect, aforesaid module can be to be configured to carry out by the controller/processor 390 of the cited function of aforesaid module, that carry out and be stored in auxiliary carrier synchronization assembly 393, channel processor 394, antenna 352, receiver 354, received frame processor 360 and the receiving processor 370 in memory 392 by controller/processor 390.In yet another aspect, aforesaid module can be to be configured to carry out assembly or any device by the cited function of aforesaid module.
In another kind configuration, UE also comprises: for send the module for the synchronizing information of all carrier frequencies of being served by Target cell to Target cell, described synchronizing information receives from cell-of-origin, for receiving the module of the FPACH ACK joining with each frequency dependence, for obtaining the module for the single transmit timing value of each frequency from received FPACH ACK, and for carry out individually the module of uplink synchronisation in each frequency of being served by Target cell.In one aspect, aforesaid module can be to be configured to carry out controller/processor 390, channel processor 394, transmitting processor 380, frame emission processor 382, transmitter 356 and the antenna 352 by the cited function of aforesaid module.In yet another aspect, aforesaid module can be to be configured to carry out assembly or any device by the cited function of aforesaid module.
Herein with reference to TD-SCDMA system introduction some aspects of telecommunication system.Those skilled in the art will easily recognize, run through various aspects described herein and can expand to other telecommunication system, the network architecture and communication standard.As an example, various aspects can expand to other UMTS system such as W-CDMA, high-speed downlink packet access (HSDPA), High Speed Uplink Packet access (HSUPA), high-speed packet access+(HSPA+) and TD-CDMA.Various aspects can also expand to the system and/or other the suitable system that use Long Term Evolution (LTE) (under FDD and/or tdd mode), senior LTE (LTE-A) (under FDD and/or tdd mode), CDMA2000, Evolution-Data Optimized (EV-DO), Ultra-Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, ultra broadband (UWB), bluetooth.Actual telecommunication standard, the network architecture and/or the communication standard using is by the overall design constraints condition that depends on specific application and system is applied.
In conjunction with various apparatus and method, some processors are described herein.These processors can be realized by electronic hardware, computer software or the two combination in any.Be embodied as hardware or become software as for sort processor, by the overall design constraints condition that depends on specific application and system is applied.The combination in any of the processor proposing in the application as an example,, the arbitrary portion of processor or processor can be used microprocessor, microcontroller, digital signal processor (DSP), field programmable gate array (FPGA), programmable logic device (PLD), state machine, gate logic, discrete hardware circuit and be configured to carry out other the suitable processing components that runs through the described various functions of the application and realize.The function of the combination in any of the processor that the application proposes, the arbitrary portion of processor or processor can use the software of being carried out by microprocessor, microcontroller, DSP or other suitable platform to realize.
No matter be called as software, firmware, middleware, microcode, hardware description language or other title, software all should broadly be construed as denoting that acute pyogenic infection of finger tip makes, thread of instruction set, code, code segment, program code, program, subprogram, software module, application program, software application, software kit, routine, subroutine, object, executable file, execution, process, function etc.Software can be positioned on computer-readable medium.As an example, computer-readable medium such as magnetic storage apparatus (for example can comprise, hard disk, floppy disk, tape), CD (for example, compact disk (CD), digital versatile disc (DVD)), the memory of smart card, flash memory device (for example, card, rod, key-type driver), random access memory (RAM), read-only memory (ROM), programming ROM (PROM), erasable PROM (EPROM), electrically-erasable PROM (EEPROM), register or mobile disk and so on.Although running through memory shown in the various aspects that the application proposes is what to separate with processor, memory also can be positioned at processor inside (for example, cache memory or register).
Computer-readable medium can be embodied in computer program.As an example, computer program can comprise the computer-readable medium that is arranged in encapsulating material.Person of skill in the art will appreciate that and how to realize and to run through the described function of the application in best mode according to the specific overall design constraints condition of applying and system is applied.
The concrete order and the level that it should be understood that the step in disclosed method are the explanations of example process.The concrete order and the level that it should be understood that step in method are to rearrange according to design preference.Appended claim to a method has provided the key element of each step with exemplary order, unless explicit state, these claim to a method are not limited to given concrete order or level.
It is that any technical staff in order to make this area can realize various aspects described herein that description is above provided.Be apparent for a person skilled in the art to the various amendments of these aspects, and General Principle defined herein can be applied to other side.Therefore, claim is not intended to be limited to various aspects shown in this article, but the four corner consistent with claim term, wherein, unless stated otherwise, be not intended to represent " one and only one " otherwise quote a certain element with singulative, but represent " one or more ".Unless special provision, otherwise that term " some " refers to is one or more.Mention that the phrase of " at least one " in item list refers to the combination in any of those entries (comprising single entry).Give one example, " at least one in following: a, b or c " is intended to contain: a; B; C; A and b; A and c; B and c; And a, b and c.The equivalent running through in all structural and function of key element of the described various aspects of the application is incorporated to clearly herein and is intended to be contained in claim with way of reference, if the equivalent in these structural and functions is known to those skilled in the art or will be known.In addition, want to offer to the public without any disclosure herein, no matter whether such disclosure is clearly documented in claims.Should not explain according to the 6th section of the 112nd article of united states patent law the key element of any claim, unless this key element be with phrase " for ... module " enunciate, or in claim to a method, this key element be use phrase " for ... step " narrate.
Claims (9)
1. for a method for the uplink synchronisation of multi-carrier time-division synchronous code division multiple access (TD-SCDMA) system, described method comprises:
Carry out the uplink synchronisation for the first frequency in described multi-carrier TD-SCDMA system, to determine the first Timing Advance for described first frequency;
In the very first time, on the described first frequency in described multi-carrier TD-SCDMA system, receive the first downlink transmission;
In the second time, at least one the auxiliary frequency in described multi-carrier TD-SCDMA system, receive the second downlink transmission, wherein, described the second asynchronism(-nization) is in the described very first time;
Measure timing slip, it is the difference between the described very first time and described the second time;
Based on described the first Timing Advance, scheduling is in the 3rd ul transmissions of time on described first frequency; And
Scheduling is the ul transmissions in described at least one auxiliary frequency in the 4th time, and described the 4th time is with respect to timing offset described in described the 3rd time migration.
2. method according to claim 1, further comprises:
Determine the second Timing Advance for described at least one auxiliary frequency; And
Carry out described uplink synchronisation in described at least one auxiliary frequency before, adjust the described uplink transmit timing for the communication in described at least one auxiliary frequency based on described the second Timing Advance.
3. method according to claim 2, wherein, described timing slip is to use the down link pilot timeslot (DwPTS) of described first frequency and described at least one auxiliary frequency to measure.
4. a subscriber equipment that is configured to carry out uplink synchronisation in multi-carrier time-division synchronous code division multiple access (TD-SCDMA) system, described subscriber equipment comprises:
For carrying out the uplink synchronisation for the first frequency of described multi-carrier TD-SCDMA system, to determine the module for the first Timing Advance of described first frequency; And
For in the very first time, on the described first frequency in described multi-carrier TD-SCDMA system, receive the module of the first downlink transmission;
For in the second time, at least one the auxiliary frequency in described multi-carrier TD-SCDMA system, receive the module of the second downlink transmission, wherein, described the second asynchronism(-nization) is in the described very first time;
For measuring the module of timing slip, described timing slip is the difference between the described very first time and described the second time;
For based on described the first Timing Advance, dispatch the module in the 3rd ul transmissions of time on described first frequency; And
For dispatching the module in the ul transmissions of the 4th time in described at least one auxiliary frequency, described the 4th time is with respect to timing offset described in described the 3rd time migration.
5. subscriber equipment according to claim 4, further comprises:
For determining the module for the second Timing Advance of described at least one auxiliary frequency; And
For carry out described uplink synchronisation in described at least one auxiliary frequency before, adjust the module for the described uplink transmit timing of the communication in described at least one auxiliary frequency based on described the second Timing Advance.
6. subscriber equipment according to claim 5, wherein, described timing slip is to use the down link pilot timeslot (DwPTS) of described first frequency and described at least one auxiliary frequency to measure.
7. a subscriber equipment, it is configured to the radio communication for multi-carrier time-division synchronous code division multiple access (TD-SCDMA) system, and described subscriber equipment comprises:
At least one processor; And
Memory, it is coupled to described at least one processor,
Wherein, described at least one processor is configured to:
Carry out the uplink synchronisation for the first frequency in described multi-carrier TD-SCDMA system, to determine the first Timing Advance for described first frequency; And
In the very first time, on the described first frequency in described multi-carrier TD-SCDMA system, receive the first downlink transmission;
In the second time, at least one the auxiliary frequency in described multi-carrier TD-SCDMA system, receive the second downlink transmission, wherein, described the second asynchronism(-nization) is in the described very first time;
Measure timing slip, it is the difference between the described very first time and described the second time;
Based on described the first Timing Advance, scheduling is in the 3rd ul transmissions of time on described first frequency; And
Scheduling is the ul transmissions in described at least one auxiliary frequency in the 4th time, and described the 4th time is with respect to timing offset described in described the 3rd time migration.
8. subscriber equipment according to claim 7, wherein, described at least one processor is further configured to:
Determine the second Timing Advance for described at least one auxiliary frequency; And
Carry out described uplink synchronisation in described at least one auxiliary frequency before, adjust the described uplink transmit timing for the communication in described at least one auxiliary frequency based on described the second Timing Advance.
9. subscriber equipment according to claim 8, wherein, described timing slip is to use the down link pilot timeslot (DwPTS) of described first frequency and described at least one auxiliary frequency to measure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410057307.5A CN103795434B (en) | 2010-10-21 | 2011-04-08 | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
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| US12/909,723 | 2010-10-21 | ||
| US12/909,723 US8798030B2 (en) | 2010-04-07 | 2010-10-21 | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
| PCT/US2011/031852 WO2011127451A1 (en) | 2010-04-07 | 2011-04-08 | Facilitating uplink synchronization in td-scdma multi-carrier systems |
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| CN116827155B (en) * | 2023-06-28 | 2024-02-20 | 荣信汇科电气股份有限公司 | Control system of cascade multi-level converter and carrier synchronization method thereof |
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| CN103795434B (en) | 2017-04-26 |
| CN103795434A (en) | 2014-05-14 |
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