WO2013067950A1 - 同步链路的建立方法及控制器 - Google Patents

同步链路的建立方法及控制器 Download PDF

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Publication number
WO2013067950A1
WO2013067950A1 PCT/CN2012/084312 CN2012084312W WO2013067950A1 WO 2013067950 A1 WO2013067950 A1 WO 2013067950A1 CN 2012084312 W CN2012084312 W CN 2012084312W WO 2013067950 A1 WO2013067950 A1 WO 2013067950A1
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WO
WIPO (PCT)
Prior art keywords
cell
timing
measurement report
frequency measurement
timing difference
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PCT/CN2012/084312
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English (en)
French (fr)
Inventor
杨映红
陈东
郑建华
常玉辉
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华为技术有限公司
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Publication of WO2013067950A1 publication Critical patent/WO2013067950A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/0055Synchronisation arrangements determining timing error of reception due to propagation delay
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0083Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/001Synchronization between nodes
    • H04W56/0015Synchronization between nodes one node acting as a reference for the others

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for establishing a synchronous link and controlling crying.
  • Wireless communication provides the basis for the implementation of mobile communication, and the effective coverage of the wireless network determines the service area of mobile communication. Since the antenna (base station) transmitting the wireless signal cannot be infinitely high, the transmission power cannot be infinitely large, and the power of the mobile phone is more limited, so the service range (cell) of a single antenna (base station) is very limited. To achieve wireless coverage across the country, the system must consist of many cells.
  • a UE User Equipment
  • cell A When a UE (User Equipment) is in a call, if it moves from one cell (cell A) to another cell (cell B), signal attenuation and channel interference increase may occur, which may affect the quality of the user's call.
  • the system can let the UE select a better signal, such as the signal provided by the cell B.
  • the radio channel provider is also changed from cell A to cell B.
  • the radio channel between the UE and the base station is transformed from the current base station (cell A) to the radio channel of the UE and another base station (cell B), or to another radio channel of the same base station. For switching.
  • Macro-diversity refers to the simultaneous establishment of two or more co-frequency links for a UE, where each link belongs to a different intra-frequency cell, so that the combining gain of macro diversity can be obtained, and the quality of the user's call is improved.
  • the UE is in the soft handover state, the data is received from multiple links at the same time, and the combined gain of the macro diversity is obtained, which can reduce the influence of fading and reduce the UE transmit power.
  • the inventor has found that at least the following problems exist in the prior art: When the UE performs an inter-frequency hard handover or an RRC (Radio Resource Control) connection establishment phase, if it is the first time in the target If a link is established at the frequency, only one link can be established. If the two links are to be established at the same time, the network cannot guarantee the timing synchronization of the two links established because there is no timing measurement parameter. The combined gain of the diversity. Summary of the invention
  • aspects of the present invention provide a method and a controller for establishing a synchronization link, which enable a UE to obtain a macro diversity set and gain at the initial establishment of a link at a target frequency point, thereby effectively reducing a user's loss during the inter-frequency hard handover process.
  • Phone rate
  • An aspect of the present invention provides a method for establishing a synchronization link, including: receiving an intra-frequency measurement report reported by one or more user equipments, where the intra-frequency measurement report includes a system frame number - a connection frame number SFN- The CFN observes the time difference; calculates a timing difference of one or more cell groups according to the SFN-CFN observation time difference; saves the timing difference; when the first UE performs an inter-frequency hard handover or an RRC connection establishment, and the first When the UE establishes multiple links on the target frequency, the first cell to which the first link established by the first UE belongs and the second cell to which the second link to be established belongs are searched from the saved record. The timing difference of the cell group is calculated and the timing parameter of the second cell is calculated. When more than two links need to be established, the timing parameters of the multiple links to be established are calculated according to the method for calculating the second link timing parameter. .
  • a controller including: a receiving unit, configured to receive an intra-frequency measurement report reported by one or more UEs, where the same-frequency measurement report includes an SFN-CFN observation time difference; a unit, configured to calculate a timing difference of one or more cell groups according to the SFN-CFN observation time difference; a timing difference saving unit, configured to save the timing difference; and a timing parameter calculation unit, configured to be performed by the first UE
  • the inter-frequency hard handover or the RRC connection is established, and the first UE establishes multiple links on the target frequency, the first cell to which the first link established by the first UE belongs is searched from the saved record.
  • the timing difference of the cell group is calculated and the timing parameter of the second cell is calculated.
  • the timing parameters of the remaining links to be established are calculated according to the method for calculating the second link timing parameter.
  • the method and the controller for establishing the synchronization link described above enable the UE to obtain a macro diversity set and gain when the UE establishes a link for the first time at the target frequency, thereby effectively reducing the user's inter-frequency hard handover process.
  • FIG. 1 is a schematic flowchart of a method for establishing a synchronization link according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a method for establishing a synchronization link according to another embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a controller according to another embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a controller according to another embodiment of the present invention. detailed description
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • FDMA Frequency Division Multiple Addressing
  • OFDMA Orthogonal Frequency-Division Multiple Access
  • SC-FDMA single carrier FDMA
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE Long Term Evolution
  • the wireless terminal can communicate with one or more core networks via a radio access network (eg, RAN, Radio Access Network), which can be a mobile terminal, such as a mobile phone (or "cellular, telephone") and with mobile
  • RAN Radio Access Network
  • the terminal computer for example, can be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges language and/or data with the wireless access network.
  • PCS Personal Communication Service
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDAs Personal Digital Assistants
  • Wireless terminals can also be called systems, subscriber units. (Subscriber Unit), Subscriber Station, Mobile Station, Mobile, Remote Station, Access Point, Remote Terminal, Access Terminal (Access Terminal), User Terminal (User Terminal), User Li (User Agent), user equipment (User Device), or user equipment (User Equipment).
  • Subscriber Unit Subscriber Station
  • Mobile Station Mobile
  • Remote Station Access Point
  • Remote Terminal Access Terminal
  • Access Terminal Access Terminal
  • User Terminal User Terminal
  • User Li User Agent
  • User Equipment User Equipment
  • User Equipment User Equipment
  • a base station can refer to one or more of the access networks that are on the air interface.
  • the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate attribute management of the air interface.
  • the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), the invention is not limited.
  • the base station controller may be a base station controller (BSC) in GSM or CDMA, or may be a radio network controller (RNC) in WCDMA, which is not limited in the present invention.
  • BSC base station controller
  • RNC radio network controller
  • system and “network” are often used interchangeably herein.
  • the term “and/or,” is merely an association describing an associated object, indicating that there may be three relationships.
  • a and / or B can mean: There are three cases where A exists separately, A and B exist at the same time, and B exists separately.
  • the character "/" in this article generally means that the contextual object is an "or” relationship.
  • An embodiment of the present invention provides a method for establishing a synchronization link, as shown in FIG. 1.
  • the controller receives an intra-frequency measurement report reported by one or more UEs, where the intra-frequency measurement report includes an SFN (System Frame Number-Connection)-CFN (Frame Number).
  • SFN System Frame Number-Connection
  • CFN Full Frame Number
  • the controller calculates a time difference of one or more cell groups according to the SFN-CFN observation time difference.
  • the controller saves the timing difference.
  • the controller searches for the first UE established by the saved record. a timing difference between a first cell to which a link belongs and a cell group of a second cell to which the second link to be established belongs, and a timing parameter of the second cell is calculated, when more than two links need to be established Calculating the timing parameters of multiple links to be established according to the method for calculating the second link timing parameter Number.
  • the hard handover refers to a handover between a UE or a coverage cell of a different frequency; the target cell is a cell to which the first UE is to be handed over.
  • the first UE may be the UE described in step 101, or may be another UE. After the intra-frequency measurement report reported by the receiving UE, the following content is further included. Selecting a cell group from the cell candidate set, wherein the cell group is a combination of two candidate cells, and the first cell and the second cell are used to distinguish two cells in the already combined cell group, where The candidate cell is a measurement target cell in the same frequency measurement report.
  • the controller determines, according to the intra-frequency measurement report reported by the UE, the SFN-CFN observation time difference of the first cell and the SFN-CFN observation time difference of the second cell, where the SFN-CFN observation time difference of the first area includes a first frame number offset (OFF1) and a first frame header offset (Tml), the SFN-CFN observation time difference of the second cell includes a second frame number offset (OFF2) and a second frame header offset (Tm2) Two parts.
  • the controller calculates a timing difference of the one or more cell groups according to the SFN-CFN observation time difference, which is specifically:
  • the timing difference (OFF 1 38400 + Tml ) - (OFF 2 38400 + Tm2).
  • the controller searches for the timing difference between the first cell to which the first link established by the first UE belongs and the cell group of the second cell to which the second link to be established belongs from the saved record. And calculating the timing parameters of the second cell includes:
  • the temp is a temporary parameter
  • the frame offset1 is the timing parameter frame number offset 1 of the first cell
  • the chip offset1 is the timing parameter frame header offset 1 of the first cell
  • the delt is the timing difference between the first cell and the second cell.
  • Frame offset2 Temp/38400, / indicates the division operation and the result of the result
  • Chip offset2 Temp%38400, where % means the division operation and the result is taken.
  • RRC radio resource control
  • the selection rule of the candidate set includes, but is not limited to: selecting, in a measurement target cell reported by the intra-frequency measurement report, a cell whose received signal quality is better than the threshold according to a preset threshold as a candidate for the candidate set. a cell that is not used to trigger a 1B/1F event is selected as a candidate cell from the same-frequency measurement report; or, a cell that triggers the 1A/1D event is selected as a candidate cell in the same-frequency measurement report; or, the same-frequency measurement report is reported.
  • the measurement target cells all serve as candidate cells in the candidate set.
  • each intra-frequency measurement report there are multiple different intra-frequency measurement reports. According to each intra-frequency measurement report, a timing difference record is generated. The same-frequency measurement report is sequentially performed by the same UE or different UEs.
  • each cell group calculates one or more timing differences according to the same frequency measurement report, and each timing difference is saved as a record, where the record includes at least One of the following fields: a cell ID or a scrambling code number of the first cell and the second cell, a timing difference between the first cell and the second cell, and a validity field for indicating the timing difference record.
  • the validity field for indicating the timing difference record is associated with the record generation time.
  • saving the record generation time may include: saving a record generation timestamp, Or save the length of time when the record distance is invalid.
  • the controller receives an intra-frequency measurement report reported by one or more UEs, where the same-frequency measurement report includes an SFN-CFN observation time difference; and observes a time difference according to the SFN-CFN.
  • Calculating a timing difference of one or more cell groups storing the timing difference, when the first UE performs an inter-frequency hard handover or an RRC connection establishment, and the first UE establishes multiple links on the target frequency point And searching for the timing difference between the first cell to which the first link established by the first UE belongs and the cell group of the second cell to which the second link to be established belongs from the saved record, and calculating the second
  • the timing parameter of the cell when more than two links need to be established, calculate the timing parameters of the multiple links to be established according to the above method.
  • the embodiment of the present invention enables the UE to obtain a macro diversity set and gain when the UE establishes a link for the first time at the target frequency point, and effectively reduces the dropped call rate of the user during the inter-frequency hard handover.
  • Another embodiment of the present invention provides a method for establishing a synchronization link.
  • the controller determines that the second UE simultaneously targets the target frequency. A plurality of new links are established, and the second UE does not report the cell synchronization information of the target cell, as shown in FIG. 2 .
  • the controller acquires a timing parameter of the first link to be established.
  • the controller selects one cell from the target cell as the first link of the second UE, and the cell is used as the first cell, and the network obtains the timing parameter of the first link according to the established principle of balanced interface load and air interface load.
  • the timing parameters include:
  • Frame offsetl (frame number offset 1), chip offsetl (frame header offset 1);
  • the RRC parameters include:
  • DPCH offset value default dedicated physical channel offset value
  • DPCH frame offset dedicated physical channel frame number offset
  • the controller acquires a timing parameter of the second link to be established and timing parameters of the remaining multiple links.
  • the second link is a synchronous link with the first link, and the other multiple links are synchronized with the first link.
  • the timing difference between the second cell to which the second link belongs and the first cell is read.
  • the calculating the timing difference includes:
  • the SFN-CFN observation time difference of the first cell includes a frame number offset (OFF1) and a first frame header offset (Tml)
  • the SFN-CFN observation time difference of the second cell includes a second frame number offset (OFF2) and a second frame header offset ( Tm2) two parts;
  • calculating timing parameters of the second link includes:
  • Temp (frame offsetl x38400+chip offset 1 ) -delt, where temp is a temporary parameter.
  • Frame offset2 temp/38400 , / indicates the division operation and the result of the result
  • Chip offset2 temp%38400 , % means the division operation and the result;
  • Frame offset2 Temp/38400, / indicates the division operation and the result of the result
  • Chip offset2 Temp%38400, where % means the division operation and the result is taken.
  • DPCH frame offset dedicated physical channel frame number offset
  • the timing parameters of the remaining multiple links are obtained by referring to the calculation method of the timing parameters of the second link.
  • the controller acquires a timing parameter of the first link to be established, and the controller acquires a timing parameter of the second link to be established and timings of the remaining multiple links. Parameters; establish a second link and the remaining links according to the timing parameters of the second link and the timing parameters of the remaining links.
  • the embodiment of the present invention enables the UE to obtain a macro diversity set and gain when the UE establishes a link for the first time at the target frequency point, thereby effectively reducing the dropped call rate of the user in the inter-frequency hard handover process.
  • Another embodiment of the present invention provides a method for establishing a synchronization link, where the controller determines that the second UE is hard-switched from the cell 11 to the cell 22, where the cell 11 and the cell 12 are the same-frequency cells and cells in the F1 frequency layer. 21 and cell 22 are co-frequency cells in the F2 frequency layer, and cell 11 and cell 21 are cells belonging to the same base station, as shown in FIG.
  • the controller acquires an SFN-CFN observation time difference of the cell 11 reported by the first UE.
  • the controller calculates a timing difference between the cell 11 and the cell 21.
  • the cell 11 and the cell 21 are cells belonging to the same base station, and the BFN (Node B Frame Number counter) is the same, and the Tcell (Timing offset of a cell) of the cell 11 is known.
  • the Tcell of cell 21 is Tcell2
  • the calculation method of the timing difference between the two cells is:
  • the controller calculates a timing difference between the cell 21 and the cell 22.
  • the calculating the timing difference between the cell 21 and the cell 22 includes:
  • the SFN-CFN observation time difference of the cell 21 includes the first frame number offset Shifting OFF1 and the first frame header offset Tml
  • the SFN-CFN observation time difference of the cell 22 includes a second frame number offset OFF2 and a second frame header offset Tm2;
  • Timing difference delt2 (OFF 1 38400+Tm 1 )-(OFF2 38400+Tm2).
  • the controller calculates a timing parameter frame number offset (frame offset2) and a frame offset (chip offset2) required for the second UE to establish a link with the cell 22.
  • the calculation methods of the frame offset2 and the chip offset2 include:
  • Temp (frame offsetl 38400+chip offsetl ) -delt2- ( Tcelll-Tcell2 ), where temp is a temporary parameter.
  • Frame offset2 temp/38400, / indicates the quotient of the division operation and the result
  • Chip offset2 temp%38400, % indicates the division operation and the result of the result;
  • Frame offset2 Temp/38400, / indicates the division operation and the result of the result
  • Chip offset2 Temp%38400, where % means the division operation and the result is taken.
  • the operation is a rounding operation
  • the DPCH frame offset is an integer multiple of 256.
  • the controller establishes a link between the second UE and the cell 22 according to the timing parameter.
  • the controller acquires an SFN-CFN observation time difference of the cell 11 reported by the first UE; the controller calculates a timing difference between the cell 11 and the cell 21; and the controller calculates the cell 21 and the cell 22
  • the timing difference between the controllers calculates a timing parameter frame number offset (frame offset2) and a frame header offset (chip offset2) required for the second UE to establish a link with the cell 22.
  • the controller establishes a second UE according to the timing parameter.
  • the embodiment of the present invention enables the UE to perform hard handover while maintaining its own CFN, and the data transmission is more stable during the handover process, and the call interruption is not easy to occur.
  • the present embodiment provides a controller. As shown in FIG. 4, the controller includes: a receiving unit 41, a timing difference calculating unit 42, a timing difference holding unit 43, and a timing parameter calculating unit 44.
  • the receiving unit 41 is configured to receive an intra-frequency measurement report reported by one or more UEs, where the intra-frequency measurement report includes an SFN-CFN observation time difference.
  • the timing difference calculation unit 42 is configured to calculate a timing difference of one or more cell groups according to the SFN-CFN observation time difference.
  • the timing difference saving unit 43 is configured to save the timing difference.
  • the timing parameter calculation unit 44 is configured to: when the first UE performs an inter-frequency hard handover or an RRC connection establishment, and the first UE establishes multiple links on the target frequency point, searching for the first one from the saved records.
  • the timing parameters of multiple links to be established are calculated according to the method for calculating the second link timing parameter.
  • the controller further includes: a cell selection unit 45, configured to select one cell group from a cell candidate set, where the cell group is a combination of a plurality of candidate cells in a candidate set The first cell and the second cell are used to distinguish two cells in the already-combined cell group, where the candidate cell is a measurement target cell in the same frequency measurement report;
  • the receiving unit 41 is further configured to: determine, according to the intra-frequency measurement report reported by the UE, an SFN-CFN observation time difference of the first cell and an SFN-CFN observation time difference of the second cell, where the first cell
  • the SFN-CFN observation time difference includes OFF1 (first frame number offset) and Tml (first frame header offset)
  • the SFN-CFN observation time difference of the second cell includes OFF2 (second frame number offset) And Tm2 (second frame header offset) two parts;
  • the cell selection unit 45 is further configured to:
  • the cell that does not trigger the 1B/1F event is selected as the candidate cell from the same-frequency measurement report; or the cell that triggers the 1A/1D event is selected as the candidate cell in the same-frequency measurement report; or the measurement object reported by the same-frequency measurement report is reported.
  • the cells all serve as candidate cells in the candidate set.
  • the timing difference holding unit 43 is specifically configured to save the timing difference of each cell group as one record, where the record includes at least one of the following fields: a cell ID of the first cell and the second cell or a scrambling code number, a timing difference between the first cell and the second cell, and a validity field for indicating the timing difference record.
  • timing difference saving unit 43 includes:
  • the record generation time holding unit 431 is configured to save the record generation time stamp, or save the time length of the record distance invalid time point.
  • the receiving unit 41 receives the same-frequency measurement report reported by one or more UEs, where the same-frequency measurement report includes an SFN-CFN observation time difference; the timing difference calculation unit 42 is configured according to the SFN-CFN. Observing the time difference to calculate the timing difference of one or more cell groups; the timing difference holding unit 43 saves the timing difference; when the first UE performs the inter-frequency hard handover or the RRC connection establishment, and the first UE is at the target frequency point When a plurality of links are established, the timing parameter calculation unit 44 searches the saved record for the first cell to which the first link established by the first UE belongs and the second cell to which the second link to be established belongs.
  • the timing difference of the cell group is calculated and the timing parameter of the second cell is calculated.
  • the timing parameters of the multiple links to be established are calculated according to the foregoing method.
  • the embodiment of the present invention enables the UE to obtain a macro diversity set and gain when the UE establishes a link for the first time at the target frequency, thereby effectively reducing the dropped call rate of the user during the inter-frequency hard handover.
  • the controller provided by the embodiment of the present invention may implement the foregoing method embodiments.
  • the method for establishing a synchronization link and the controller provided by the embodiment of the present invention may be applicable to a scenario in which inter-cell synchronization timing information needs to be acquired, such as a cell handover or an RRC connection setup, but is not limited thereto.
  • a person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a Read-Only Memory (ROM), a random access memory (RAM), A variety of media that can store program code, such as a disk or an optical disk.

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Abstract

本发明实施例公开了一种同步链路的建立方法及控制器,所述方法包括:接收用户终端(UE)上报的同频测量报告,所述同频测量报告中包括系统帧号-连接帧号(SFN-CFN)观察时间差(101);根据所述SFN-CFN观察时间差计算一个或多个小区组的定时差(102);将所述定时差进行保存(103);当第一UE进行异频硬切换或无线资源控制(RRC)连接建立、且所述第一UE在目标频点上建立多条链路时,从保存的记录中查找所述第一UE建立的第一条链路所属的第一小区与要建立的第二条链路所属的第二小区组的定时差并计算所述第二小区的定时参数,当需要建立的链路超过两条时,根据计算第二条链路定时参数的方法计算要建立的多条链路的定时参数(104)。本发明适用于小区切换、RRC连接建立等需要获取小区间同步定时信息的场景。

Description

同步链路的建立方法及控制器 本申请要求于 2011 年 11 月 08 日提交中国专利局、 申请号为 201110351831.X、发明名称为"同步链路的建立方法及控制器"的中国专利申 请的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域, 特别涉及一种同步链路的建立方法及控制 哭。
背景技术
无线通信为移动通信的实现提供了基础, 而无线网络的有效覆盖范围 决定了移动通信的服务区域。 由于发射无线信号的天线 (基站) 不可能无 限高, 发射功率也不可能无限大, 而手机的功率更加有限, 因此单独一个 天线(基站) 的服务范围 (小区)是非常有限的。 要实现全国的无线覆盖, 系统必定由许许多多的小区构成。
UE ( User Equipment, 用户设备)通话时, 若从一个小区 (小区 A )移 动到另外一个小区 (小区 B ), 可能出现信号衰减、 频道干扰增加等情况, 这些都会影响用户的通话质量。 这时系统可以让 UE选择一个更好的信号, 如小区 B提供的信号。 那么无线信道提供者也要由小区 A改变为小区 B。 在 跨越小区边界时, UE与基站间的无线信道从当前基站(小区 A ) 变换到 UE 与另外一个基站(小区 B )的无线信道, 或者变换到同一基站的另外一个无 线信道, 这一过程称为切换。 宏分集是指给一个 UE同时建立两个或两个以 上的同频链路, 其中每个链路分属于不同的同频小区,这样能够得到宏分集 的合并增益, 提高用户通话质量。 UE在软切换状态时, 同时从多条链路接 收数据,得到宏分集的合并增益,可以减少衰落的影响并降低 UE发射功率。 在实现本发明的过程中, 发明人发现现有技术中至少存在如下问题: 当 UE进行异频硬切换或 RRC ( Radio Resource Control, 无线资源控制) 连接建立阶段时, 如果是第一次在目标频点上建立链路, 则只能建立一条 链路; 如果第一次想要同时建立两条链路, 由于没有定时测量参数, 网络 无法保证建立的两条链路的定时同步, 不能得到宏分集的合并增益。 发明内容
本发明的多个方面提供一种同步链路的建立方法及控制器, 能够使 UE 在目标频点上初次建立链路就得到宏分集合并增益, 有效降低用户在异频 硬切换过程中的掉话机率。
本发明的一方面, 提供一种同步链路的建立方法, 包括: 接收一个或 多个用户设备 UE上报的同频测量报告,所述同频测量报告中包括系统帧号- 连接帧号 SFN-CFN观察时间差; 根据所述 SFN-CFN观察时间差计算一个或 多个小区组的定时差; 将所述定时差进行保存; 当第一 UE进行异频硬切换 或 RRC连接建立、 且所述第一 UE在目标频点上建立多条链路时, 从保存的 记录中查找所述第一 UE建立的第一条链路所属的第一小区与要建立的第二 条链路所属的第二小区的小区组的定时差并计算所述第二小区的定时参 数, 当需要建立的链路超过两条时, 根据计算第二条链路定时参数的方法 计算要建立的多条链路的定时参数。
本发明的另一方面, 提供一种控制器, 包括: 接收单元, 用于接收一 个或多个 UE上报的同频测量报告, 所述同频测量报告中包括 SFN-CFN观察 时间差; 定时差计算单元, 用于根据所述 SFN-CFN观察时间差计算一个或 多个小区组的定时差; 定时差保存单元, 用于将所述定时差进行保存; 定 时参数计算单元, 用于当第一 UE进行异频硬切换或 RRC连接建立、 且所述 第一 UE在目标频点上建立多条链路时,从保存的记录中查找所述第一 UE建 立的第一条链路所属的第一小区与要建立的第二条链路所属的第二小区的 小区组的定时差并计算所述第二小区的定时参数, 当需要建立的链路超过 两条时, 根据计算第二条链路定时参数的方法计算要建立的其余链路的定 时参数。
网络与现有技术相比, 上述描述的同步链路的建立方法及控制器, 能 够使 UE在目标频点上初次建立链路就得到宏分集合并增益, 有效降低用户 在异频硬切换过程中的掉话机率。 附图说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例或现 有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面描述中 的附图仅仅是本发明的一些实施例, 对于本领域普通技术人员来讲, 在不 付出创造性劳动的前提下, 还可以根据这些附图获得其它的附图。
图 1为本发明一实施例的一种同步链路的建立方法的流程示意图; 图 2为本发明另一实施例的一种同步链路的建立方法的流程示意图; 图 3为本发明另一实施例的一种同步链路的建立方法的流程示意图; 图 4为本发明另一实施例的一种控制器的结构示意图;
图 5为本发明另一实施例的一种控制器的结构示意图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进 行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没 有做出创造性劳动前提下所获得的所有其它实施例, 都属于本发明保护的 范围。
为使本发明技术方案的优点更加清楚, 下面结合附图和实施例对本发 明作详细说明。 本文中描述的各种技术可用于各种无线通信系统, 例如当前 2G, 3G 通信系统和下一代通信系统,例如全球移动通信系统(GSM, Global System for Mobile communications ), 码分多址 ( CDMA, Code Division Multiple Access ) 系统, 时分多址(TDMA, Time Division Multiple Access ) 系统, 宽带码分多址 ( WCDMA , Wideband Code Division Multiple Access Wireless ), 频分多址 ( FDMA, Frequency Division Multiple Addressing ) 系 统,正交频分多址( OFDMA, Orthogonal Frequency-Division Multiple Access ) 系统,单载波 FDMA( SC-FDMA )系统,通用分组无线业务( GPRS, General Packet Radio Service ) 系统, 长期演进(LTE, Long Term Evolution ) 系统, 以及其他此类通信系统。
本文中结合用户设备和 /或基站和 /或基站控制器来描述各种方面。
用户设备, 可以是指向用户提供语音和 /或数据连通性的设备, 具有无 线连接功能的手持式设备、 或连接到无线调制解调器的其他处理设备。 无 线终端可以经无线接入网 (例如, RAN, Radio Access Network ) 与一个或 多个核心网进行通信, 无线终端可以是移动终端, 如移动电话(或称为"蜂 窝,,电话)和具有移动终端的计算机, 例如, 可以是便携式、 袖珍式、 手持 式、 计算机内置的或者车载的移动装置, 它们与无线接入网交换语言和 /或 数据。 例 口, 个人通信业务 ( PCS, Personal Communication Service ) 电话、 无绳电话、会话发起协议(SIP )话机、无线本地环路(WLL, Wireless Local Loop )站、 个人数字助理(PDA, Personal Digital Assistant )等设备。 无线 终端也可以称为系统、 订户单元 (Subscriber Unit )、 订户站 (Subscriber Station ),移动站( Mobile Station )、移动台( Mobile )、远程站( Remote Station )、 接入点 (Access Point ), 远程终端 (Remote Terminal ), 接入终端 (Access Terminal ), 用户终端 ( User Terminal )、 用户代理(User Agent )、 用户设备 ( User Device )、 或用户装备 ( User Equipment )。
基站 (例如, 接入点)可以是指接入网中在空中接口上通过一个或多 个扇区与无线终端通信的设备。 基站可用于将收到的空中帧与 IP分组进行 相互转换, 作为无线终端与接入网的其余部分之间的路由器, 其中接入网 的其余部分可包括网际协议(IP )网络。基站还可协调对空中接口的属性管 理。 例如, 基站可以是 GSM或 CDMA中的基站 (BTS, Base Transceiver Station ), 也可以是 WCDMA中的基站 ( NodeB ), 还可以是 LTE中的演进 型基站( NodeB或 eNB或 e-NodeB, evolutional Node B ),本发明并不限定。
基站控制器,可以是 GSM或 CDMA中的基站控制器( BSC, base station controller ) ,也可以是 WCDMA中的无线网络控制器( RNC , Radio Network Controller ), 本发明并不限定。
另外, 本文中术语"系统,,和"网络"在本文中常被可互换使用。本文中术 语"和 /或,,, 仅仅是一种描述关联对象的关联关系, 表示可以存在三种关系, 例如, A和 /或 B, 可以表示: 单独存在 A, 同时存在 A和 B, 单独存在 B这三 种情况。 另外, 本文中字符" /", 一般表示前后关联对象是一种"或"的关系。 本发明的一个实施例提供一种同步链路的建立方法, 如图 1所示。
101、控制器接收一个或多个 UE上报的同频测量报告,所述同频测量报 告中包括 SFN ( System Frame Number-Connection , 系统帧号) -CFN ( Frame Number, 连接帧号)观察时间差。
102、控制器才艮据所述 SFN-CFN观察时间差计算一个或多个小区组的定 时差。
103、 控制器将所述定时差进行保存。
104、 当第一 UE进行异频硬切换或 RRC连接建立、 且所述第一 UE在目 标频点上建立多条链路时, 控制器从保存的记录中查找所述第一 UE建立的 第一条链路所属的第一小区与要建立的第二条链路所属的第二小区的小区 组的定时差并计算所述第二小区的定时参数, 当需要建立的链路超过两条 时, 根据计算第二条链路定时参数的方法计算要建立的多条链路的定时参 数。
其中, 所述硬切换是指 UE在不同频率的基站或覆盖小区之间的切换; 所述目标小区为第一 UE所要切换到的小区。
其中, 所述第一 UE可以是步骤 101中所述的 UE, 也可以是其他 UE。 其中, 在所述接收 UE上报的同频测量报告之后, 还包括如下内容。 从 小区候选集中选定一个小区组, 其中, 所述小区组为多个候选小区两两组 合而成, 在已经组合的小区组内用第一小区和第二小区区分两个小区, 其 中, 所述候选小区为同频测量 ^艮告中的测量对象小区。
控制器根据 UE上报的同频测量报告, 确定所述第一小区的 SFN-CFN观 察时间差和所述第二小区的 SFN-CFN观察时间差, 其中所述第一' 区的 SFN-CFN观察时间差包括第一帧号偏移 (OFF1 )和第一帧头偏移 ( Tml ) 两部分, 所述第二小区的 SFN-CFN观察时间差包括第二帧号偏移 (OFF2 ) 和第二帧头偏移 (Tm2 ) 两部分。
则控制器根据所述 SFN-CFN观察时间差计算一个或多个小区组的定时 差具体为:
所述定时差 =(OFF 1 38400+Tml )-(OFF2 38400+Tm2)。
进一步的, 所述控制器从保存的记录中查找所述第一 UE建立的第一条 链路所属的第一小区与要建立的第二条链路所属的第二小区的小区组的定 时差并计算所述第二小区的定时参数包括:
计算第二小区的定时参数帧号偏移 2 ( frame offset2 )和帧头偏移 2( chip offset2 ):
temp= ( frame offsetl ><38400+chip offsetl ) -delt,
其中, temp为临时参数, frame offsetl为第一小区的定时参数帧号偏移 1 , chip offsetl为第一小区的定时参数帧头偏移 1 , delt为第一小区与第二小区的 定时差。
当 temp≥0时, frame offset2=temp/38400, /表示除法操作并取结果的商, chip offset2=temp%38400, %表示除法操作并取结果的余;
当 temp < 0时, Temp=temp+38400x256,
frame offset2=Temp/38400 , /表示除法操作并取结果的商 ,
chip offset2=Temp%38400 , %表示除法操作并取结果的余。
该链路对应的无线资源控制 (RRC ) 参数, 专用物理信道帧号偏移 ( DPCH frame offset ) = ( chip offset2/256 ) χ256 ,该运算为圓整运算, DPCH frame offset是 256的整数倍。
其中, 所述候选集的 选规则包括但不限于: 根据预先设定的阔值在 同频测量报告上报的测量对象小区中挑选 UE接收信号质量优于所述阔值的 小区作为候选集中的候选小区; 从同频测量报告中筛选没有触发 1B/1F事件 的小区作为候选小区; 或, 同频测量报告中筛选触发了 1A/1D事件的小区作 为候选小区; 或, 将同频测量报告上报的测量对象小区全部作为候选集中 的候选小区。
其中, 针对某个同频测量报告, 对于同一个小区组, 只会产生一条定 时差记录, 并产生多个小区组的定时差记录;
针对某个小区组, 存在多条不同的同频测量报告, 根据每条同频测量 报告都会产生一条定时差记录, 其中, 所述同频测量报告由同一 UE或不同 的 UE依次上才艮。
其中, 所述将所述定时差进行保存具体为: 每个小区组根据同频测量 报告计算得到一个或多个定时差, 每个定时差都作为一条记录进行保存, 其中, 所述记录至少包括下面字段之一: 第一小区和第二小区的小区 ID或 扰码号、 第一小区和第二小区之间的定时差、 用于指示所述定时差记录的 有效性字段。
其中, 所述用于指示所述定时差记录的有效性字段与记录生成时间相 关连, 具体的, 保存所述记录生成时间可以包括: 保存记录生成时间戳、 或保存该记录距离无效时刻点的时间长度。
本发明实施例提供的同步链路的建立方法, 控制器接收一个或多个 UE 上报的同频测量报告, 所述同频测量报告中包括 SFN-CFN观察时间差; 根 据所述 SFN-CFN观察时间差计算一个或多个小区组的定时差; 将所述定时 差进行保存, 当第一 UE进行异频硬切换或 RRC连接建立、 且所述第一 UE在 目标频点上建立多条链路时, 从保存的记录中查找所述第一 UE建立的第一 条链路所属的第一小区与要建立的第二条链路所属的第二小区的小区组的 定时差并计算所述第二小区的定时参数, 当需要建立的链路超过两条时, 根据上述方法计算要建立的多条链路的定时参数。 与现有技术相比, 本发 明实施例能够使 UE在目标频点上初次建立链路就得到宏分集合并增益, 有 效降低用户在异频硬切换过程中的掉话机率。 本发明的另一实施例提供一种同步链路的建立方法, 第二 UE在进行异 频硬切换立即宏分集或者 RRC阶段的立即宏分集时, 控制器决策第二 UE在 目标频点上同时建立多条新链路, 而此时第二 UE没有上报目标小区的小区 同步信息, 如图 2所示。
201、 控制器获取要建立的第一条链路的定时参数。
控制器从目标小区中选择一个小区作为第二 UE的第一条链路, 所述小 区作为第一小区, 网络根据既定的平衡接口负载及空口负载的原则获取第 一条链路的定时参数, 所述定时参数包括:
frame offsetl (帧号偏移 1 ), chip offsetl (帧头偏移 1 );
以及 RRC参数, 例如, 所述 RRC参数包括:
Default DPCH offset value (默认专用物理信道偏移值)和 DPCH frame offset (专用物理信道帧号偏移)。
202、 控制器获取要建立的第二条链路的定时参数以及其余多条链路的 定时参数。 其中, 所述第二条链路与第一条链路为同步链路, 其余多条链路均与 所述第一条链路为同步链路。
具体的, 在计算所述第二条链路的定时参数前先读取所述第二条链路 所属的第二小区与第一小区间的定时差。
其中, 计算所述定时差, 包括:
根据第一 UE上报的同频测量报告, 确定所述第一小区的 SFN-CFN观察 时间差和所述第二小区的 SFN-CFN观察时间差, 其中所述第一小区的 SFN-CFN观察时间差包括第一帧号偏移 (OFF1 )和第一帧头偏移 (Tml ) 两部分, 所述第二小区的 SFN-CFN观察时间差包括第二帧号偏移 (OFF2 ) 和第二帧头偏移 (Tm2 ) 两部分;
则定时差 (delt ) =(OFF 1 38400+Tm 1 )-(OFF2 38400+Tm2)„
进一步的, 计算所述第二条链路的定时参数包括:
计算第二小区与第一小区同步的定时参数帧号偏移 2 frame offset2和帧 头偏移 2 chip offset2。
具体的, 包括:
temp= ( frame offsetl x38400+chip offset 1 ) -delt, 其中, temp为临时参 数。
当 temp≥0时,
frame offset2=temp/38400 , /表示除法操作并取结果的商,
chip offset2=temp%38400 , %表示除法操作并取结果的余;
当 temp < 0时, Temp=temp+38400x256 ,
frame offset2=Temp/38400 , /表示除法操作并取结果的商 ,
chip offset2=Temp%38400 , %表示除法操作并取结果的余。
该链路对应的 RRC参数, 专用物理信道帧号偏移 ( DPCH frame offset )
= ( chip offset2/256 ) χ256 , 该运算为圓整运算, DPCH frame offset是 256的 整数倍。 进一步的, 其余多条链路的定时参数参照第二条链路的定时参数的计 算方法获得。
203、 根据第二条链路的定时参数以及其余链路的定时参数建立第二条 链路和其余链路。
本发明实施例提供的同步链路的建立方法, 控制器获取要建立的第一 条链路的定时参数; 控制器获取要建立的第二条链路的定时参数以及其余 多条链路的定时参数; 根据第二条链路的定时参数以及其余链路的定时参 数建立第二条链路和其余链路。 与现有技术相比, 本发明实施例能够使 UE 在目标频点上初次建立链路就得到宏分集合并增益, 有效降低用户在异频 硬切换过程中的掉话机率。 本发明的另一实施例提供一种同步链路的建立方法, 控制器决策第二 UE从小区 11硬切换到小区 22, 其中, 小区 11和小区 12为处于 F1频率层的同 频小区, 小区 21和小区 22为处于 F2频率层的同频小区, 小区 11和小区 21又 为属于同一基站的小区, 如图 3所示。
301、 控制器获取第一 UE上报的小区 11的 SFN-CFN观察时间差。
302、 控制器计算小区 11和小区 21的定时差。
具体的, 所述小区 11和小区 21为属于同一基站的小区,其 BFN ( Node B Frame Number counter , 帧号计数)相同, 已知小区 11的 Tcell ( Timing offset of a cell, 小区偏移时间) 为 Tcelll , 小区 21的 Tcell为 Tcell2, 两小区定时差 计算方法为:
deltl=SFNll-SFN21=Tcelll-Tcell2。
303、 控制器计算小区 21和小区 22之间的定时差。
具体的, 所述计算小区 21和小区 22之间的定时差包括:
接收第一 UE上报的小区 21的 SFN-CFN观察时间差和小区 22的 SFN-CFN观察时间差, 其中小区 21的 SFN-CFN观察时间差包括第一帧号偏 移 OFF1和第一帧头偏移 Tml两部分, 小区 22的 SFN-CFN观察时间差包括 第二帧号偏移 OFF2和第二帧头偏移 Tm2两部分;
定时差 delt2=(OFF 1 38400+Tm 1 )-(OFF2 38400+Tm2)。
304、 控制器计算第二 UE与小区 22建立链路所需的定时参数帧号偏移 ( frame offset2 )和帧头偏移 ( chip offset2 )。
具体的, 所述 frame offset2和 chip offset2的计算方法包括:
temp= ( frame offsetl 38400+chip offsetl ) -delt2- ( Tcelll-Tcell2 ), 其中, temp为临时参数。
当 temp≥0时,
frame offset2=temp/38400, /表示除法操作并取结果的商,
chip offset2=temp%38400, %表示除法操作并取结果的余;
当 temp < 0时, Temp=temp+38400x256,
frame offset2=Temp/38400 , /表示除法操作并取结果的商 ,
chip offset2=Temp%38400 , %表示除法操作并取结果的余。
该链路对应的 RRC参数, 专用物理信道帧号偏移 DPCH frame offset=
( chip offset2/256 ) χ256, 该运算为圓整运算, DPCH frame offset是 256的整 数倍。
305、 控制器根据定时参数建立第二 UE与小区 22的链路。
本发明实施例提供的同步链路的建立方法, 控制器获取第一 UE上报的 小区 11的 SFN-CFN观察时间差; 控制器计算小区 11和小区 21的定时差; 控 制器计算小区 21和小区 22之间的定时差; 控制器计算第二 UE与小区 22建立 链路所需的定时参数帧号偏移( frame offset2 )和帧头偏移 ( chip offset2 ); 控制器根据定时参数建立第二 UE与小区 22的链路。 与现有技术相比, 本发 明实施例能够使 UE在保持自身 CFN不变的情况下进行硬切换, 在此切换过 程中数据的传输更稳定, 不易发生通话中断。 本实施例提供一种控制器,如图 4所示, 所述控制器包括:接收单元 41 , 定时差计算单元 42, 定时差保存单元 43和定时参数计算单元 44。
接收单元 41 , 用于接收一个或多个 UE上报的同频测量报告, 所述同频 测量报告中包括 SFN-CFN观察时间差。
定时差计算单元 42, 用于根据所述 SFN-CFN观察时间差计算一个或多 个小区组的定时差。
定时差保存单元 43 , 用于将所述定时差进行保存。
定时参数计算单元 44,用于当第一 UE进行异频硬切换或 RRC连接建立、 且所述第一 UE在目标频点上建立多条链路时, 从保存的记录中查找所述第 一 UE建立的第一条链路所属的第一小区与要建立的第二条链路所属的第二 小区的小区组的定时差并计算所述第二小区的定时参数, 当需要建立的链 路链路超过两条时, 根据计算第二条链路定时参数的方法计算要建立的多 条链路的定时参数。
其中, 如图 5所示, 所述控制器还包括: 小区选择单元 45 , 用于从小区 候选集中选定一个小区组, 其中, 所述小区组为候选集中多个候选小区两 两组合而成, 在已经组合的小区组内用第一小区和第二小区区分两个小区, 其中, 所述候选小区为同频测量 ^艮告中的测量对象小区;
则所述接收单元 41还用于: 根据 UE上报的同频测量报告, 确定所述第 一小区的 SFN-CFN观察时间差和所述第二小区的 SFN-CFN观察时间差, 其 中所述第一小区的 SFN-CFN观察时间差包括 OFF1 (第一帧号偏移)和 Tml (第一帧头偏移) 两部分, 所述第二小区的 SFN-CFN观察时间差包括 OFF2 (第二帧号偏移)和 Tm2 (第二帧头偏移) 两部分;
则所述定时差计算单元 42, 具体用于: 计算一个或多个小区组的定时 差 , 所述定时差 =(OFF 1 38400+Tml )-(OFF2 38400+Tm2)。
具体的, 所述小区选择单元 45还用于:
根据预先设定的阔值在同频测量报告上报的测量对象小区中, 挑选 UE 接收信号质量优于所述阔值的小区作为候选集中的候选小区; 或
从同频测量报告中筛选没有触发 1B/1F事件的小区作为候选小区; 或 同频测量 ^艮告中筛选触发了 1A/1D事件的小区作为候选小区; 或 将同频测量报告上报的测量对象小区全部作为候选集中的候选小区。 其中, 所述定时差保存单元 43 , 具体用于将每个小区组的定时差作为 一条记录进行保存, 其中, 所述记录至少包含下面字段之一: 第一小区和 第二小区的小区 ID或扰码号、 第一小区和第二小区之间的定时差、 用于指 示所述定时差记录的有效性字段。
进一步的, 所述定时差保存单元 43包括:
记录生成时间保存单元 431 , 用于保存记录生成时间戳、 或保存该记录 距离无效时刻点的时间长度。
本发明实施例提供的控制器, 接收单元 41接收一个或多个 UE上报的同 频测量报告, 所述同频测量报告中包括 SFN-CFN观察时间差; 定时差计算 单元 42根据所述 SFN-CFN观察时间差计算一个或多个小区组的定时差; 定 时差保存单元 43将所述定时差进行保存; 当第一 UE进行异频硬切换或 RRC 连接建立、 且所述第一 UE在目标频点上建立多条链路时, 定时参数计算单 元 44从保存的记录中查找所述第一 UE建立的第一条链路所属的第一小区与 要建立的第二条链路所属的第二小区的小区组的定时差并计算所述第二小 区的定时参数, 当需要建立的链路超过两条时, 根据上述方法计算要建立 的多条链路的定时参数。 与现有技术相比, 本发明实施例能够使 UE在目标 频点上初次建立链路就得到宏分集合并增益, 有效降低用户在异频硬切换 过程中的掉话机率。
本发明实施例提供的控制器可以实现上述提供的方法实施例, 具体功 能实现请参见方法实施例中的说明, 在此不再赘述。 本发明实施例提供的 同步链路的建立方法及控制器可以适用于小区切换、 RRC连接建立等需要 获取小区间同步定时信息的场景, 但不仅限于此。 所属领域的技术人员可以清楚地了解到, 为描述的方便和简洁, 上述 描述的系统, 装置和单元的具体工作过程, 可以参考前述方法实施例中的 对应过程, 在此不再赘述。
在本申请所提供的几个实施例中, 应该理解到, 所揭露的系统, 装置 和方法, 可以通过其它的方式实现。 例如, 以上所描述的装置实施例仅仅 是示意性的, 例如, 所述单元的划分, 仅仅为一种逻辑功能划分, 实际实 现时可以有另外的划分方式, 例如多个单元或组件可以结合或者可以集成 到另一个系统, 或一些特征可以忽略, 或不执行。 另一点, 所显示或讨论 的相互之间的耦合或直接耦合或通信连接可以是通过一些接口, 装置或单 元的间接耦合或通信连接, 可以是电性, 机械或其它的形式。 作为单元显示的部件可以是或者也可以不是物理单元, 即可以位于一个地 方, 或者也可以分布到多个网络单元上。 可以根据实际的需要选择其中的 部分或者全部单元来实现本实施例方案的目的。
另外, 在本发明各个实施例中的各功能单元可以集成在一个处理单元 中, 也可以是各个单元单独物理存在, 也可以两个或两个以上单元集成在 一个单元中。 上述集成的单元既可以釆用硬件的形式实现, 也可以釆用软 件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销 售或使用时, 可以存储在一个计算机可读取存储介质中。 基于这样的理解, 本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方 案的全部或部分可以以软件产品的形式体现出来, 该计算机软件产品存储 在一个存储介质中, 包括若干指令用以使得一台计算机设备(可以是个人 计算机, 服务器, 或者网络设备等)执行本发明各个实施例所述方法的全 部或部分步骤。而前述的存储介质包括: U盘、移动硬盘、只读存储器( ROM, Read-Only Memory ). 随机存取存 4诸器 ( RAM, Random Access Memory )、 磁碟或者光盘等各种可以存储程序代码的介质。
以上所述, 以上实施例仅用以说明本发明的技术方案, 而非对其限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通技术人员 应当理解: 其依然可以对前述各实施例所记载的技术方案进行修改, 或者 对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权利要求
1、 一种同步链路的建立方法, 其特征在于, 包括:
接收一个或多个用户设备 ( UE )上报的同频测量报告, 所述同频测量 报告中包括系统帧号-连接帧号 (SFN-CFN )观察时间差;
根据所述 SFN-CFN观察时间差计算一个或多个小区组的定时差; 将所述定时差进行保存;
当第一 UE进行异频硬切换或无线资源控制 (RRC )连接建立、 且所述 第一 UE在目标频点上建立多条链路时,从保存的记录中查找所述第一 UE建 立的第一条链路所属的第一小区与要建立的第二条链路所属的第二小区的 小区组的定时差并计算所述第二小区的定时参数, 当需要建立的链路超过 两条时, 根据计算第二条链路定时参数的方法计算要建立的多条链路的定 时参数。
2、 根据权利要求 1所述的同步链路的建立方法, 其特征在于, 在所述 接收一个或多个 UE上报的同频测量报告之后, 还包括:
从小区候选集中选定一个小区组, 其中, 所述小区组为候选集中多个 候选小区两两组合而成, 在已经组合的小区组内用第一小区和第二小区区 分两个小区, 其中, 所述候选小区为同频测量报告中的测量对象小区; 根据 UE上报的同频测量报告, 确定所述第一小区的 SFN-CFN观察时间 差和所述第二小区的 SFN-CFN观察时间差, 其中所述第一小区的 SFN-CFN 观察时间差包括第一帧号偏移 (OFF1 )和第一帧头偏移 (Tml ) 两部分, 所述第二小区的 SFN-CFN观察时间差包括第二帧号偏移(OFF2 )和第二帧 头偏移 (Tm2 ) 两部分;
则根据所述 SFN-CFN观察时间差计算一个或多个小区组的定时差具体 为:
定时差 =(OFF 1 38400+Tml )-(OFF2 38400+Tm2)。
3、 根据权利要求 2所述的方法, 其特征在于, 所述候选集的筛选规则 包括:
根据预先设定的阔值在同频测量报告上报的测量对象小区中, 挑选 UE 接收信号质量优于所述阔值的小区作为候选集中的候选小区; 或
从同频测量报告中筛选没有触发 1B/1F事件的小区作为候选小区; 或 同频测量 ^艮告中筛选触发了 1A/1D事件的小区作为候选小区; 或 将同频测量报告上报的测量对象小区全部作为候选集中的候选小区。
4、 根据权利要求 1所述的同步链路的建立方法, 其特征在于, 针对某 个同频测量报告, 对于同一个小区组只会产生一条定时差记录, 并产生多 个小区组的定时差记录;
针对某个小区组, 存在多条不同的同频测量报告, 每条同频测量报告 都会产生一条定时差记录, 其中, 所述同频测量报告由相同的 UE或不同的 UE上报。
5、 根据权利要求 1所述的同步链路的建立方法, 其特征在于, 所述将 所述定时差进行保存具体为:
每个小区组根据同频测量报告计算得到一个或多个定时差, 每个定时 差都作为一条记录进行保存, 其中, 所述记录至少包括下面字段之一: 第 一小区和第二小区的小区 ID或扰码号、 第一小区和第二小区之间的定时差、 用于指示所述定时差记录的有效性字段。
6、 根据权利要求 5所述的同步链路的建立方法, 其特征在于, 所述用 于指示所述定时差记录的有效性字段与记录生成时间相关连,
则所述保存所述记录生成时间包括:
保存记录生成时间戳、 或保存该记录距离无效时刻点的时间长度。
7、 一种控制器, 其特征在于, 包括:
接收单元, 用于接收一个或多个 UE上报的同频测量报告, 所述同频测 量报告中包括 SFN-CFN观察时间差;
定时差计算单元, 用于根据所述 SFN-CFN观察时间差计算一个或多个 小区组的定时差;
定时差保存单元, 用于将所述定时差进行保存。
定时参数计算单元, 用于当第一 UE进行异频硬切换或 RRC连接建立、 且所述第一 UE在目标频点上建立多条链路时, 从保存的记录中查找所述第 一 UE建立的第一条链路所属的第一小区与要建立的第二条链路所属的第二 小区的小区组的定时差并计算所述第二小区的定时参数, 当需要建立的链 路超过两条时, 根据计算第二条链路定时参数的方法计算要建立的多条链 路的定时参数。
8、 根据权利要求 7所述的控制器, 其特征在于, 所述控制器还包括: 小区选择单元, 用于从小区候选集中选定一个小区组, 其中, 所述小 区组为候选集中多个候选小区两两组合而成, 在已经组合的小区组内用第 一小区和第二小区区分两个小区, 其中, 所述候选小区为同频测量报告中 的测量对象小区;
则所述接收单元还用于: 根据 UE上报的同频测量报告, 确定所述第一 小区的 SFN-CFN观察时间差和所述第二小区的 SFN-CFN观察时间差, 其中 所述第一小区的 SFN-CFN观察时间差包括第一帧号偏移(OFF1 )和第一帧 头偏移 (Tml ) 两部分, 所述第二小区的 SFN-CFN观察时间差包括第二帧 号偏移 (OFF2 )和第二帧头偏移 (Tm2 ) 两部分;
则所述定时差计算单元具体用于: 计算一个或多个小区组的定时差, 所述定时差 =(OFF 1 38400+Tml )-(OFF2 38400+Tm2)。
9、 根据权利要求 8所述的控制器, 其特征在于, 小区选择单元还用于: 根据预先设定的阔值在同频测量报告上报的测量对象小区中, 挑选 UE 接收信号质量优于所述阔值的小区作为候选集中的候选小区; 或
从同频测量报告中筛选没有触发 1B/1F事件的小区作为候选小区; 或 同频测量 ^艮告中筛选触发了 1A/1D事件的小区作为候选小区; 或 将同频测量报告上报的测量对象小区全部作为候选集中的候选小区。
10、根据权利要求 7所述的控制器,其特征在于, 所述定时差保存单元, 具体用于将每个小区组的定时差作为一条记录进行保存, 其中, 所述记录 至少包括下面字段之一: 第一小区和第二小区的小区 ID或扰码号、 第一小 区和第二小区之间的定时差、 用于指示所述定时差记录的有效性字段。
11、 根据权利要求 10所述的控制器, 其特征在于, 所述定时差保存单 元包括:
记录生成时间保存单元, 用于保存记录生成时间戳、 或保存该记录距 离无效时刻点的时间长度。
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