WO2010041992A1 - Détection de désynchronisation assistée par un terminal utilisateur - Google Patents

Détection de désynchronisation assistée par un terminal utilisateur Download PDF

Info

Publication number
WO2010041992A1
WO2010041992A1 PCT/SE2008/051132 SE2008051132W WO2010041992A1 WO 2010041992 A1 WO2010041992 A1 WO 2010041992A1 SE 2008051132 W SE2008051132 W SE 2008051132W WO 2010041992 A1 WO2010041992 A1 WO 2010041992A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
time
user terminal
synch
difference
Prior art date
Application number
PCT/SE2008/051132
Other languages
English (en)
Inventor
Lei Xiao
Huaisong Zhu
Qingyu Miao
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to CN200880131517.7A priority Critical patent/CN102177666B/zh
Priority to PCT/SE2008/051132 priority patent/WO2010041992A1/fr
Publication of WO2010041992A1 publication Critical patent/WO2010041992A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention generally relates to radio communication systems, devices, software and methods and, more particularly, to mechanisms and techniques for detecting base stations and/or cells that are out-of-synchronism with the telecommunication network.
  • One such third generation system is Time Division-Synchronous Code
  • TD-SCDMA Time Division Multiple Access
  • 3GPP 3 rd Generation Partnership Project
  • ReI- 4 ReI- 4
  • TD-SCDMA uses Time-Division Duplex (TDD), in contrast to the
  • FDD Frequency-Division Duplex
  • W-CDMA Wideband Code Division Multiple Access
  • TD-SCDMA uses Time Division Multiple Access (TDMA) in addition to the CDMA used in WCDMA. This reduces the number of users in each timeslot, which reduces the implementation complexity of multiuser detection and beamforming schemes, but the non-continuous transmission also may reduce coverage (because of the higher peak power needed), and mobility (because of lower power control frequency).
  • the "S” in TD-SCDMA stands for "synchronous,” which means that uplink signals are synchronized at the base station receiver, achieved by continuous timing adjustments. This reduces the interference between users of the same timeslot using different codes by improving the orthogonality between the codes, therefore increasing system capacity, at the cost of some hardware complexity in achieving uplink synchronization.
  • TD-SCDMA is a time-division system in which each sub-radio frame 10
  • the sub-radio frame 10 may include a downlink traffic broadcasting time period DT followed by an uplink traffic time period UT followed by another DT.
  • the first DT in Figure 1 may be configured to carry broadcasting control traffic, for example, the physical channel that carries the broadcast channel (PCCPCH). Because both the downlink and uplink traffic is taking place in the same sub-frame 10, the switching points SP1 and SP2 are used to delimitate the uplink traffic from the downlink traffic.
  • PCCPCH broadcast channel that carries the broadcast channel
  • the sub-frames of the cells have to be synchronized (to be in synch) in time to avoid adjacent cell's downlink signal affect the uplink time period signal of the current cell illustrated in Figure 1.
  • a mechanism to maintain the synchronization of the entire radio network is needed to avoid these problems.
  • the network operator may set high requirements to be maintained for the base station's synchronization to not affect the capacity of the entire telecommunication network.
  • GPS Global Positioning System
  • a corresponding time drifting should be kept within 1 ⁇ s, in order to maintain the desired reliability of the network.
  • the operator may configure the base station with the lost GPS signal to automatically shut down after 24 hours.
  • the base station that lost the GSP signal may maintain the desired synchronization, and thus, the shutting down of this base station is unnecessary.
  • the operator of the network does not have the capability to determine whether the base station with the lost GPS is still maintaining the synchronization and thus, this base station has to be shut down, which is undesirable in this case.
  • the operators of the TD-SCDMA network which is deployed in China, have no mechanism to actually measure and use the synchronization of the base stations with the rest of the network in real time.
  • the TD-SCDMA configuration is different from other 3G cellular technologies, and thus, it is not obvious, based on the other existing 3G technologies, to modify an existing 3G technology to arrive at the TD-SCDMA configurations.
  • the radio network does not have the capacity to continuously monitor the adjacent cells' timing difference capacity, especially when all these cells are in service.
  • a method for determining when a first base station in a telecommunication network is out of synch with the network including at least a second base station and a user terminal configured to receive signals from the first and second base stations.
  • the method includes receiving in a control module of the network a measuring report from the user terminal, where the measuring report includes a first time of arrival of a first signal from the first base station to the user terminal and a second time of arrival of a second signal from the second base station to the user terminal; receiving a maximum of a travel time difference between (i) a first travel time of the first signal from the first base station to the user terminal, and (ii) a second travel time of the second signal from the second base station to the user terminal; determining a minimum of a difference starting time, which corresponds to a time offset between a starting time of the first signal and a starting time of the second signal, as a difference between (i) a difference between the first time of arrival and the second time of arrival, and (ii) the maximum travel time difference; comparing the determined minimum difference starting time with a predetermined threshold; and identifying the pair of the first base station and the second base station as including one base station that lost the synch, when the determined minimum difference starting time is larger than the predetermined threshold
  • control module in a telecommunication network for determining when a first base station in the telecommunication network is out of synch with the network, the network including at least a second base station and a user terminal configured to receive signals from the first and second base stations.
  • the control module includes an input interface configured to receive a measuring report from the user terminal, where the measuring report includes a first time of arrival of a first signal from the first base station to the user terminal and a second time of arrival of a second signal from the second base station to the user terminal; and a processor connected to the input interface and configured to receive a maximum of a travel time difference between (i) a first travel time of the first signal from the first base station to the user terminal, and (ii) a second travel time of the second signal from the second base station to the user terminal, determine a minimum of a difference starting time, which corresponds to a time offset between a starting time of the first signal and a starting time of the second signal, as a difference between (i) a difference between the first time of arrival and the second time of arrival, and (ii) the maximum travel time difference, compare the determined minimum difference starting time with a predetermined threshold, and identify the pair of the first base station and the second base station as including one base station that lost the synch, when the determined minimum difference starting time
  • a computer readable medium including computer executable instructions, wherein the instructions, when executed by a processor in a control module of a telecommunication network, cause the processor to determine when a first base station in the telecommunication network is out of synch with the network, the network including at least a second base station and a user terminal configured to receive signals from the first and second base stations.
  • the instructions include receiving in a control module of the network a measuring report from the user terminal, where the measuring report includes a first time of arrival of a first signal from the first base station to the user terminal and a second time of arrival of a second signal from the second base station to the user terminal; receiving a maximum of a travel time difference between (i) a first travel time of the first signal from the first base station to the user terminal, and (ii) a second travel time of the second signal from the second base station to the user terminal; determining a minimum of a difference starting time, which corresponds to a time offset between a starting time of the first signal and a starting time of the second signal, as a difference between (i) a difference between the first time of arrival and the second time of arrival, and (ii) the maximum travel time difference; comparing the determined minimum difference starting time with a predetermined threshold; and identifying the pair of the first base station and the second base station as including one base station that lost the synch, when the determined minimum difference starting time is larger than the predetermined threshold
  • Figure 1 is a schematic diagram of a sub-frame in a TD-SCDMA telecommunication network
  • Figure 2 is a schematic diagram of a TD-SCDMA telecommunication network that includes at least two base stations and a user terminal
  • Figure 3 is a schematic diagram of a TD-SCDMA telecommunication network that includes at least two base stations and a user terminal according to an exemplary embodiment
  • Figure 4 is flow diagram that illustrates steps performed by a control module to maintain the network in sync according to an exemplary embodiment
  • Figure 5 is a schematic diagram of a control module or user terminal.
  • Figure 6 is a schematic diagram of a part of the TD-SCDMA telecommunication network.
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • PCCPCH Primary Common Control Physical Channel
  • a general telecommunication system 20 may include plural cells C1 to C2 22, each cell having one or more base stations BS1 to BS2 24. In this exemplary embodiment, each cell is shown having only one base station 24. However, a cell may have more than one base station.
  • a user terminal UE 26 may be served by base station BS1 of cell C1 but the user terminal may still be able to receive a signal from BS2, which is in the neighboring cell C2.
  • the user terminal UE may be capable of receiving a first transmission signal TxBSI from the first base station BS1 and a second transmission signal TxBS2 from the second base station BS2.
  • the signals are sent at corresponding times TO and TO'. These times are identical for ideal base stations. However, the base stations are sending the signals with a small time difference, i.e., TO - TO'.
  • the expected transmission times of base stations BS1 and BS2 may be known in advance by the user terminal UE.
  • the user terminal is able to determine/calculate a difference of the actual transmission times TO and TO' (the actual transmission times of the base stations may be different from the expected transmission times of the base stations), then, based on these actual times, the synchronism of the two base stations BS1 and BS2 may be calculated.
  • the operator of the network that includes both cells C1 and C2 knows in advance the expected transmission times and may compare these expected transmission times to the actually transmission times of the base stations. Based in part on this observation, the following exemplary embodiments disclose how the synchronism of the base stations is to be determined.
  • the handover measurements in the TD-SCDMA system are briefly discussed.
  • the handover measurements are related to the movement of the user terminal UE from cell C1 to cell C2 and how the cell C1 handovers the control of the transmission to the user terminal UE to cell C2.
  • a baton handover which is a characteristic feature of TD-SCDMA (baton handover, similar to the procedure of handing over a baton in a relay race, is based mainly on mobile positioning capability provided by TD-SCDMA base stations)
  • the user terminal UE may continuously detect a signal from the serving cell C1 and from the neighboring cell C2 (the PCCPCH channel may be monitored for receiving these signals in downlink traffic as shown for example in Figure 1 ). Based on these received signals, the user terminal UE may measure a timing difference of the received PCCPCH channels.
  • the 3GPP standard determines that the user terminal UE should support several kinds of measurements in the network, for example, a timing advance (the time taken by a signal to travel from the user terminal to the base station), etc., and all these measurements may be based on the timing difference of received PCCPCH channels.
  • a timing advance the time taken by a signal to travel from the user terminal to the base station
  • the measurement accuracy requirement (predetermined threshold) for the timing difference of adjacent cells measurement is desirable to be around +/- 0.125chip (+/- 0.098 ⁇ s).
  • the radio network algorithm of each network may be configured to require these measurements in a periodic report from the user terminal UE, or only when a certain criterion is met.
  • the user terminal measurements that are used by the network for handover may also be used to detect and calculate the timing difference between adjacent base stations as discussed next.
  • a maximum travel time difference (transmission Tx delay) of two adjacent cells C1 and C2 may be determined in the TD-SCDMA system, during the network planning, as being equal to T1 - T2, in which T1 is the transmission delay corresponding to the transmission signal TxBSI travelling from the base station BS1 24 to the user terminal UE 26 and T2 is the transmission delay corresponding to the transmission signal TxBS2 travelling from the base station BS2 24 to the user terminal UE 26.
  • the maximum travel time difference may be estimated, for example, by considering a signal transmitted from BS1 to BS2.
  • the maximum T1-T2 may be calculated as a maximum delay for plural user terminals which are located in a first cell and are ready to handover to a second cell or vice verse.
  • the positions of the plural user terminals in the handover area are taken into consideration when calculating the maximum of T1 - T2.
  • the maximum delay travel time difference may depend on the air environment between the base stations, for example, rural or urban medium, by the cell range, etc.
  • a time difference measured by the user terminal UE 26 relative to the arrival of the transmission signals TxBSI and TxBS2 at the user terminal UE is equal to Ta1-Ta2, where Ta1 is the time of arrival at the user terminal UE of the transmission signal from base station BS1 and Ta2 is the time of arrival of the corresponding transmission signal from base station BS2.
  • a timing error at one or more base stations may be cataloged as follows:
  • Case 1 a specific base station error is present, for example the GPS hardware module does not work, failing to provide an accurate time to the base station. These errors are detected by this base station;
  • Case 2 a specific base station error is present, and the affected base station fails to find itself the error; and [0039] Case 3: the entire synchronization source is faulty, a large area of the service is impacted, the source cannot be detected.
  • the operator needs to know when to shut down the base station to avoid a large timing difference in the system, which is undesirable.
  • the minimum timing difference TO - TO' of pairs of base stations is continuously (for example every time the user terminal experiences a handover) calculated in a preset control module CM 28 of the network, based on the measurements received from the user terminal UE.
  • the control module CM may also receive similar measurements from other user terminals in the network so that all active base stations may be monitored.
  • control module CM may inform the management module (MM) 30 of the network operator about the loss of synch, and the management module MM or the control module CM then forces the affected base station out-of-service to prevent the loss of synch in the other base stations.
  • a certain predetermined threshold which may be operator dependent
  • Case 2 because the base station that is experiencing the time delay is not aware of this fact, the network operator has to determine which base station is having difficulties, without relying on information from the affected base station as in Case 1.
  • Case 1 the affected base station was able to communicate with the network operator and inform the management module about its identity and the experienced error.
  • the network operator (that includes the control module 28 and the management module 30) monitors the minimum timing difference TO - TO' of pairs of base stations. To reduce the time required by the monitoring step, the network operator may monitor only adjacent pairs of base stations, where the adjacent base stations may be defined based on their corresponding cells being geographically adjacent.
  • the network operator determines that a pair of base stations has a minimum timing difference TO - TO' larger than the predetermined threshold, and no other data is received from the respective base stations, the network operator has to identify which one of the two base stations is losing the synch. Because any base station in the network is likely to have more than one adjacent base station, the loss of synch should be manifest in other pairs of base stations that include the affected base station. Thus, the network operator may monitor base stations that are adjacent to at least one base station of the pair of base stations that appear to lose synch. After identifying another pair of base stations that are exhibiting signs of losing the synch, the network operator verifies if a common base station exists among the pairs of base stations that exhibit a loss of synch.
  • the network operator may verify that the common base station has a same phase for each of the timing difference with the neighboring base stations, for positively identifying the common base station as the one that is losing the synch. Then, the network operator verifies the size of the timing difference, i.e., whether the timing difference is above a certain predetermined threshold, and based on this info, the network operator decides whether to shut down the affected base station.
  • the implementation of an algorithm in the network for deciding the location of a base station that is affected by an error may be operator dependent, as various judgment rules may be used to determine which base station is experiencing the synch loss. For example, in one exemplary embodiment, the network operator may decide that a base station is affected by a timing problem if at least two neighboring base stations, when paired up with the suspected base station, are affected by this problem.
  • Case 3 is different from the previous cases because, in this case, each base station may have its own timing.
  • a reference timing may be selected based on one or more of the existing base stations that lost their synchronization source.
  • the network operator may decide to follow Case 2 for deciding which other base stations are to be shut down. For example, the network operator may designate certain cells (which are considered to be important) as key cells, and these cells may have a high priority to be kept in service even when the entire network lost the synchronization source.
  • the timing of the important cells is considered to be the reference timing and the remaining cells are verified, based on the method discussed above, whether are in synch with the important cells.
  • the steps to be followed for operating the network as discussed above are exemplified, according to an exemplary embodiment, in Figure 4.
  • Figure 4 a method for determining when a first base station in a telecommunication network is out of synch with the network is illustrated.
  • the network may include at least a second base station and a user terminal configured to receive signals from the first and second base stations.
  • the method includes a step 400 of receiving in a control module of the network a measuring report from the user terminal, where the measuring report includes a first time of arrival of a first signal from the first base station to the user terminal and a second time of arrival of a second signal from the second base station to the user terminal, a step 402 of receiving a maximum of a travel time difference between (i) a first travel time of the first signal from the first base station to the user terminal, and (ii) a second travel time of the second signal from the second base station to the user terminal, a step 404 of determining a minimum of a difference starting time, which corresponds to a time offset between a starting time of the first signal and a starting time of the second signal, as a difference between (i) a difference between the first time of arrival and the second time of arrival, and (ii) the maximum travel time difference, a step 406 of comparing the determined minimum difference starting time with a predetermined threshold, and a step 408 of identifying the pair of the
  • the network operator is now capable to locate a base station that generates a timing error by using measurements from the user terminal.
  • no new requirements are demanded from the base station and/or the user terminal UE, and also no new requirement is demanded from the radio interface.
  • the implementation of one or more embodiments will have no impact onto the current standard and also no impact onto the current base station and user terminals.
  • the network may have the capability to continuously detect (via the user terminal) the timing difference of adjacent cells for locating what kind of errors are present to specific base stations, without the need to modify the network to provide these measurements.
  • the network may have the capability to identify a failed base station (from synch point of view) even if the base station is not aware of this problem. Further, the timing difference detection does not interrupt the normal work of the base station.
  • the base station may be used when the radio network is in service. Furthermore, if a specific base station lost its synchronization source, the network operator may force this station out of service only when the timing difference drift is intolerable to the radio network, not just simply based on a certain hold-over time as discussed in the Background section.
  • the exemplary user terminal arrangement 500 may include a processing/control unit 502, such as a microprocessor, reduced instruction set computer (RISC), or other central processing module.
  • the processing unit 502 need not be a single device, and may include one or more processors.
  • the processing unit 502 may include a master processor and associated slave processors coupled to communicate with the master processor.
  • the processing unit 502 may control the basic functions of the mobile terminal as dictated by programs available in the storage/memory 504. Thus, the processing unit 502 may execute the functions described in Figures 2 to 4. More particularly, the storage/memory 504 may include an operating system and program modules for carrying out functions and applications on the mobile terminal.
  • the program storage may include one or more of read-only memory (ROM), flash ROM, programmable and/or erasable ROM, random access memory (RAM), subscriber interface module (SIM), wireless interface module (WIM), smart card, or other removable memory device, etc.
  • the program modules and associated features may also be transmitted to the user terminal arrangement 500 via data signals, such as being downloaded electronically via a network, such as the Internet.
  • One of the programs that may be stored in the storage/memory 504 is a specific program 506.
  • the specific program 506 may instruct various components of the user terminal to interact with adjacent base stations to perform measurements as discussed in the exemplary embodiments.
  • the program 506 and associated features may be implemented in software and/or firmware operable by way of the processor 502.
  • the program storage/memory 504 may also be used to store data 508, such as the various measurements performed by the user terminal, or other data associated with the present exemplary embodiments.
  • the programs 506 and data 508 are stored in non-volatile electrically- erasable, programmable ROM (EEPROM), flash ROM, etc. so that the information is not lost upon power down of the user terminal 500.
  • EEPROM electrically- erasable, programmable ROM
  • the processor 502 may also be coupled to user interface 510 elements associated with the user terminal.
  • the user interface 510 of the user terminal may include, for example, a display 512 such as a liquid crystal display, a keypad 514, speaker 516, and a microphone 518. These and other user interface components are coupled to the processor 502 as is known in the art.
  • the keypad 514 may include alpha-numeric keys for performing a variety of functions, including dialing numbers and executing operations assigned to one or more keys.
  • other user interface mechanisms may be employed, such as voice commands, switches, touch pad/screen, graphical user interface using a pointing device, trackball, joystick, or any other user interface mechanism.
  • the user terminal arrangement 500 may also include a digital signal processor (DSP) 520.
  • the DSP 520 may perform a variety of functions, including analog-to-digital (A/D) conversion, digital-to-analog (D/A) conversion, speech coding/decoding, encryption/decryption, error detection and correction, bit stream translation, filtering, etc.
  • the transceiver 522 generally coupled to an antenna 524, may transmit and receive the radio signals associated with a wireless device.
  • the mobile computing arrangement 500 of Figure 5 is provided as a representative example of a user terminal in which the principles of the present exemplary embodiments may be applied.
  • the present invention is equally applicable in a variety of other currently known and future mobile and fixed computing environments.
  • the specific application 506 and associated features, and data 508, may be stored in a variety of manners, may be operable on a variety of processing devices, and may be operable in mobile devices having additional, fewer, or different supporting circuitry and user interface mechanisms.
  • the principles of the present exemplary embodiments are equally applicable to non-mobile terminals, i.e., landline computing systems.
  • the network servers or other systems for providing calculation and management in connection with the present exemplary embodiments may be any type of computing device capable of processing and communicating information.
  • An example of a representative computing system capable of carrying out operations in accordance with the servers of the exemplary embodiments is illustrated in Figure 6.
  • Hardware, firmware, software or a combination thereof may be used to perform the various steps and operations described herein.
  • the structure 600 of Figure 6 is an example computing structure that may be used in connection with such a system.
  • the example computing arrangement 600 suitable for performing the activities described in the exemplary embodiments may include a control module or server 601. Such a server 601 may also serve as the management module or the management module may have the same structure as server 601.
  • the server 601 may include a central processor (CPU) 602 coupled to a random access memory (RAM) 604 and to a read-only memory (ROM) 606.
  • the ROM 606 may also be other types of storage media to store programs, such as programmable ROM (PROM), erasable PROM (EPROM), etc.
  • the processor 602 may communicate with other internal and external components through input/output (I/O) circuitry 608 and bussing 610, to provide control signals and the like.
  • the bussing 610 may be, for example, an input interface unit that communicates with user terminals UE present in the network served by the arrangement 600.
  • the processor 602 carries out a variety of functions as is known in the art, as dictated by software and/or firmware instructions.
  • the server 601 may also include one or more data storage devices, including hard and floppy disk drives 612, CD-ROM drives 614, and other hardware capable of reading and/or storing information such as DVD, etc.
  • software for carrying out the above discussed steps may be stored and distributed on a CD-ROM 616, diskette 618 or other form of media capable of portably storing information. These storage media may be inserted into, and read by, devices such as the CD-ROM drive 614, the disk drive 612, etc.
  • the server 601 may be coupled to a display 620, which may be any type of known display or presentation screen, such as LCD displays, plasma display, cathode ray tubes (CRT), etc.
  • a user input interface 622 is provided, including one or more user interface mechanisms such as a mouse, keyboard, microphone, touch pad, touch screen, voice-recognition system, etc.
  • the server 601 may be coupled to other computing devices, such as the landline and/or wireless terminals and associated applications, via a network.
  • the server may be part of a larger network configuration as in a global area network (GAN) such as the Internet 628, which allows ultimate connection to the various landline and/or mobile devices.
  • GAN global area network
  • the disclosed exemplary embodiments provide a user terminal, a system, a method and a computer program product for determining a timing difference between pairs of base stations in a transmission network. It should be understood that this description is not intended to limit the invention. On the contrary, the exemplary embodiments are intended to cover alternatives, modifications and equivalents, which are included in the spirit and scope of the invention as defined by the appended claims. Further, in the detailed description of the exemplary embodiments, numerous specific details are set forth in order to provide a comprehensive understanding of the claimed invention. However, one skilled in the art would understand that various embodiments may be practiced without such specific details.
  • the exemplary embodiments may be embodied in a wireless communication device, a telecommunication network, as a method or in a computer program product. Accordingly, the exemplary embodiments may take the form of an entirely hardware embodiment or an embodiment combining hardware and software aspects. Further, the exemplary embodiments may take the form of a computer program product stored on a computer-readable storage medium having computer-readable instructions embodied in the medium. Any suitable computer readable medium may be utilized including hard disks, CD-ROMs, digital versatile disc (DVD), optical storage devices, or magnetic storage devices such a floppy disk or magnetic tape. Other non-limiting examples of computer readable media include flash-type memories or other known memories.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un module de contrôle, un support lisible par ordinateur et un procédé pour déterminer le moment où une première station de base (BS1) dans un réseau de télécommunication (20) se trouve en désynchronisation avec le réseau (20), le réseau (20) comprenant au moins une seconde station de base (BS2) et un terminal utilisateur (26) configuré de manière à recevoir des signaux des première et seconde stations de base (BS1, BS2). Le procédé comprend la réception dans un module de contrôle (28) du réseau (20) d'un rapport de mesure du terminal utilisateur (26), le rapport de mesure comprenant un premier temps d'arrivée (Ta1) d'un premier signal de la première station de base (BS1) au terminal utilisateur (26) et un second temps d'arrivée (Ta2) d'un second signal de la seconde station de base (BS2) au terminal utilisateur (26) ; la réception d'un maximum de différence de temps de propagation (max(T1 - T2)) entre (i) un premier temps de propagation (T 1) du premier signal de la première station de base (BS 1) au terminal utilisateur (26), et (ii) un second temps de propagation (T2) du second signal de la seconde station de base (BS2) au terminal utilisateur (26) ; la détermination d'un minimum de temps de départ de différence (min(T0 - T0')), qui correspond à un décalage temporel entre un temps de départ (T0) du premier signal et un temps de départ (T0') du second signal, en tant que différence entre (i) une différence entre le premier temps d'arrivée (Ta1) et le second temps d'arrivée (Ta2), et (ii) la différence de temps de propagation maximum (max(T1 - T2)) ; la comparaison du temps de départ de différence minimum déterminé (min(T0 - T0')) à un seuil prédéterminé ; et l'identification de la paire de la première station de base (BS1) et de la seconde station de base (BS2) comme comprenant une station de base qui a perdu la synchronisation avec le réseau, lorsque le temps de départ de différence minimum déterminé (min(T0-T0')) est supérieur au seuil prédéterminé à l'étape de comparaison.
PCT/SE2008/051132 2008-10-07 2008-10-07 Détection de désynchronisation assistée par un terminal utilisateur WO2010041992A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200880131517.7A CN102177666B (zh) 2008-10-07 2008-10-07 用户终端辅助的不同步检测
PCT/SE2008/051132 WO2010041992A1 (fr) 2008-10-07 2008-10-07 Détection de désynchronisation assistée par un terminal utilisateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2008/051132 WO2010041992A1 (fr) 2008-10-07 2008-10-07 Détection de désynchronisation assistée par un terminal utilisateur

Publications (1)

Publication Number Publication Date
WO2010041992A1 true WO2010041992A1 (fr) 2010-04-15

Family

ID=40278718

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/051132 WO2010041992A1 (fr) 2008-10-07 2008-10-07 Détection de désynchronisation assistée par un terminal utilisateur

Country Status (2)

Country Link
CN (1) CN102177666B (fr)
WO (1) WO2010041992A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102387515A (zh) * 2010-09-01 2012-03-21 鼎桥通信技术有限公司 基站失步检测方法及基站系统
EP2561709A1 (fr) * 2010-04-22 2013-02-27 Nokia Corp. Synchronisation en boucle ouverte/fermée pour émetteurs radio
EP2863676A4 (fr) * 2012-06-14 2015-12-02 Huawei Tech Co Ltd Procédé et dispositif pour la détermination d'un défaut de synchronisation d'horloge
EP3151605A4 (fr) * 2014-05-29 2018-01-31 Sony Corporation Dispositif électronique et procédé pour une détection synchrone entre des cellules de communication sans fil de duplexage à répartition dans le temps
CN113329094A (zh) * 2021-06-10 2021-08-31 中国联合网络通信集团有限公司 信息推送时间确定方法、装置、设备、介质及产品

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019533924A (ja) * 2016-09-30 2019-11-21 テレフオンアクチーボラゲット エルエム エリクソン（パブル） Ｎｕｍｅｒｏｌｏｇｙに基づく同期および非同期動作の間の適合化
US10251139B2 (en) * 2017-05-31 2019-04-02 Nokia Technologies Oy Active user selection in massive MIMO
CN114114325B (zh) * 2021-04-22 2022-07-22 中国电信股份有限公司 校准方法、装置以及系统
CN117322111A (zh) * 2021-08-06 2023-12-29 Oppo广东移动通信有限公司 通信方法及通信装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5872774A (en) * 1997-09-19 1999-02-16 Qualcomm Incorporated Mobile station assisted timing synchronization in a CDMA communication system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060292982A1 (en) * 2005-06-24 2006-12-28 Lucent Technologies, Inc. Method for accomodating timing drift between base stations in a wireless communications system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5872774A (en) * 1997-09-19 1999-02-16 Qualcomm Incorporated Mobile station assisted timing synchronization in a CDMA communication system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2561709A1 (fr) * 2010-04-22 2013-02-27 Nokia Corp. Synchronisation en boucle ouverte/fermée pour émetteurs radio
EP2561709A4 (fr) * 2010-04-22 2013-09-04 Nokia Corp Synchronisation en boucle ouverte/fermée pour émetteurs radio
CN102387515A (zh) * 2010-09-01 2012-03-21 鼎桥通信技术有限公司 基站失步检测方法及基站系统
EP2863676A4 (fr) * 2012-06-14 2015-12-02 Huawei Tech Co Ltd Procédé et dispositif pour la détermination d'un défaut de synchronisation d'horloge
US9578613B2 (en) 2012-06-14 2017-02-21 Huawei Technologies Co., Ltd. Method and apparatus for determining clock desynchronization
EP3151605A4 (fr) * 2014-05-29 2018-01-31 Sony Corporation Dispositif électronique et procédé pour une détection synchrone entre des cellules de communication sans fil de duplexage à répartition dans le temps
EP3570581A1 (fr) * 2014-05-29 2019-11-20 SONY Corporation Dispositif électronique et procédé de détection synchrone entre des cellules de communication en duplex par division temporelle
US10708108B2 (en) 2014-05-29 2020-07-07 Sony Corporation Electronic device and method for synchronous detection between time division duplex wireless communication cells
CN113329094A (zh) * 2021-06-10 2021-08-31 中国联合网络通信集团有限公司 信息推送时间确定方法、装置、设备、介质及产品
CN113329094B (zh) * 2021-06-10 2022-07-08 中国联合网络通信集团有限公司 信息推送时间确定方法、装置、设备、介质及产品

Also Published As

Publication number Publication date
CN102177666B (zh) 2015-06-03
CN102177666A (zh) 2011-09-07

Similar Documents

Publication Publication Date Title
WO2010041992A1 (fr) Détection de désynchronisation assistée par un terminal utilisateur
CN109891957B (zh) Ue补偿的定时提前
FI91345B (fi) Menetelmä kanavanvaihdon tehostamiseksi
US9572123B2 (en) Multiple time advance for radio access networks
US7912011B2 (en) Radio communication system, base station, mobile station and wireless communication method
CA2320996C (fr) Procede et dispositif servant a faciliter la synchronisation de stations de base dans un systeme de communications mobile asynchrone amdc
US20120178454A1 (en) Method and apparatus for obtaining identifier of small cell in wireless communication system having hierarchical cell structure
US20090005042A1 (en) Method of broadcasting system information in communication cells for handoff
US20040002334A1 (en) Method of performing inter-rat measurement for a handover from NB-TDD to GSM
US8427997B2 (en) Access method and apparatus of multimedia broadcast multicast service on dedicated carrier
US8787310B2 (en) Mobile station device and transmission power control method
CN109474938B (zh) 获取邻小区定时的方法、装置及用户设备
CN102257747A (zh) 用于识别不同步基站的方法和设备
JP4337007B1 (ja) 無線通信システム、基地局、端末、無線通信方法、プログラム
US20150304977A1 (en) Method and apparatus for timing advance selection for synchronized uplink transmission
US8340661B2 (en) Low-cost multimode GSM monitoring from TD-SCDMA
US8599882B2 (en) Mobile communication system, mobile station device, base station device and handover method
EP3422601B1 (fr) Procédé et dispositif pour effectuer une synchronisation
TW201545579A (zh) 調度方法及裝置
JP2010074755A (ja) 送信データ出力タイミング調整方法及び基地局
KR100659935B1 (ko) 이동통신 시스템에서 핸드오버를 위한 타겟 셀 결정 방법
US20040137910A1 (en) Method and device for determining the position of subsciber devices of a radio communication system with the aid of additional positioning elements
EP2239871A1 (fr) Procédé de radiocommunication, système de radiocommunication, et station de base
EP2627051B1 (fr) L'évitement de collision de symbole de référence dans un réseau radio cellulaire
KR100524739B1 (ko) 이동통신 시스템의 소프트 핸드오버 방법

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200880131517.7

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08877318

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08877318

Country of ref document: EP

Kind code of ref document: A1