WO2013013618A1 - 小区更换的方法和设备 - Google Patents

小区更换的方法和设备 Download PDF

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Publication number
WO2013013618A1
WO2013013618A1 PCT/CN2012/079145 CN2012079145W WO2013013618A1 WO 2013013618 A1 WO2013013618 A1 WO 2013013618A1 CN 2012079145 W CN2012079145 W CN 2012079145W WO 2013013618 A1 WO2013013618 A1 WO 2013013618A1
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WO
WIPO (PCT)
Prior art keywords
cell
user equipment
offset
state
target cell
Prior art date
Application number
PCT/CN2012/079145
Other languages
English (en)
French (fr)
Inventor
王淑坤
莱格•彼得
奥鲁佛松•亨里克
王学龙
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP12817906.6A priority Critical patent/EP2728937B1/en
Publication of WO2013013618A1 publication Critical patent/WO2013013618A1/zh
Priority to US14/164,902 priority patent/US20140141785A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • H04W36/32Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/324Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by mobility data, e.g. speed data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • H04W36/32Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/04Reselecting a cell layer in multi-layered cells

Definitions

  • Wireless communication systems can provide wireless services such as voice, data, and the like.
  • a typical wireless communication system is a multiple access wireless system, such as FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access), and CDMA (Code Division Multiple Access).
  • a base station transmits data and/or control information to a user equipment (UE, User Equipment) on the downlink, and receives data and/or control information transmitted by the UE on the uplink. Similarly, the UE transmits data and/or control information to the base station on the uplink and receives data and/or control information transmitted by the base station on the downlink.
  • UE User Equipment
  • the UE selects the cell with the best signal quality to reside and obtain the service of the network.
  • the serving cell is selected and replaced based on a comparison of the signal quality of the currently serving cell and the neighboring cell.
  • this cell change is called cell reselection.
  • this cell change is called cell handover (cel l handover ⁇ for high-speed mobile UEs, this cell replacement will be compared. Frequent.
  • An aspect of the present invention provides a method for cell replacement, including: determining that a target cell for cell replacement is a micro cell, cell replacement includes cell reselection or cell handover; determining a mobile device state or moving speed of the user equipment; The state or the moving speed, the cell replacement decision for the target cell is performed.
  • Another aspect of the present invention provides a cell replacement method, including: generating a cell list, where the cell list includes cell identifiers of one or more cells; and sending the cell list to the user equipment, so that the user equipment according to the cell list and The mobile state or the moving speed of the user equipment performs a cell replacement decision for the target cell, and the cell replacement includes cell reselection or cell handover.
  • a user equipment including: a first determining unit, configured to determine that a target cell for cell replacement is a micro cell, where cell replacement includes cell reselection or cell switching; and second determining unit, configured to determine a user a moving state or a moving speed of the device; and a determining unit, configured to perform a cell replacement decision for the target cell according to the moving state or the moving speed of the user equipment.
  • a base station including: a generating unit, configured to generate a cell list, where the cell list includes a cell identifier of one or more cells, and a sending unit, configured to send, to the user equipment, a cell generated by the generating unit a list, so that the user equipment performs a cell change decision for the target cell according to the cell list and the mobile state or the moving speed of the user equipment, where the cell replacement includes cell reselection or cell handover.
  • the embodiment of the present invention considers the mobile state or the moving speed of the user equipment in the process of performing the cell replacement decision for the micro cell, so as to reduce unnecessary cell replacement for the micro cell, thereby reducing the frequent cell replacement.
  • FIG. 1 is a flow chart of a cell replacement method according to an embodiment of the present invention.
  • FIG. 2 is a flow chart of a cell replacement method according to another embodiment of the present invention.
  • FIG. 3 is a schematic flow chart of a cell replacement process according to an embodiment of the present invention.
  • FIG. 4 is a block diagram of a user equipment in accordance with an embodiment of the present invention.
  • FIG. 5 is a block diagram of a base station in accordance with one embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.
  • the technical solution of the present invention can be applied to various communication systems, for example: Global mobile communication system (Global
  • GSM Global System of Mobi le communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE Long Term Evolution
  • UE User Equipment
  • Mobi le Terminal mobile terminal
  • a mobile user equipment etc.
  • a radio access network for example, RAN, Radio Access Network
  • core networks for example, RAN, Radio Access Network
  • the user equipment may be a mobile terminal, such as a mobile phone (or "cellular" phone) or a computer with a mobile terminal, for example, a mobile device that can be portable, pocket, handheld, computer built, or in-vehicle, Exchange language and/or data with the wireless access network.
  • the base station may be a base station (BTS, Base Transceiver Station) in a GSM or CDMA system, or may be a base station (NodeB) in a WCDMA system, or may be an evolved base station (eNB or e_NodeB, evolutional Node B) in the LTE system.
  • AP Access Point
  • the present invention is not limited.
  • Embodiments of the present invention will be described below by taking an LTE (Long Term Evolution) or LTE-A (LTE-Advanced, Advanced Long Term Evolution) wireless communication system as an example.
  • LTE-A Long Term Evolution-Advanced, Advanced Long Term Evolution
  • base stations such as low transmit power base stations or transmit/receive nodes
  • the network structure is called a heterogeneous network.
  • the above low transmission power base station or transmitting/receiving node such as Micro BS (micro base station), Pico BS (pico base station), Home BS (home base station), f emto BS (femto base station), Relay BS (relay base station), RRH (Remote Radio Head).
  • a large transmit power base station (such as a macro base station, a macro eNodeB, and a MeNB) deployed in a heterogeneous network is often a cell of an LPN (referred to as a "micro” compared to a low transmit power base station (referred to as a lower power node, LPN).
  • the coverage of the area " ) is relatively smaller than the coverage of the cell of the macro base station (which may be referred to as a "macro cell"). Due to the large number of microcells introduced, and the microcell radius is small, when the high speed UE passes through the microcell, it may just switch or reselect to the microcell and switch or reselect. For example, the dwell time in the microcell is less than 1 second. This switching is an unnecessary switch. For the UE in the connected state, the number of handovers in the added cell increases the signaling load on the network side and the throughput of the system. At the same time, the handover in this scenario increases the failure rate and dropped calls of the UE handover, which seriously affects. User's feelings.
  • FIG. 1 is a flow chart of a cell replacement method according to an embodiment of the present invention. The method of Figure 1 is performed by a user equipment.
  • the user equipment may receive a cell list sent by the base station, and determine, according to the cell list, whether the target cell of the cell replacement is a micro cell.
  • the cell list includes cell identities of one or more cells. For example, if the cells in the cell list are all micro cells, and the cell identity of the target cell is included in the cell list, it is determined that the target cell is a micro cell.
  • the embodiment of the present invention is not limited to identifying a micro cell by using a cell list sent by the base station, and the user equipment may also determine, according to other manners, whether the target cell is a micro cell. These modifications are all within the scope of embodiments of the invention.
  • 102. Determine a mobile state or a moving speed of the user equipment.
  • the embodiment of the present invention does not limit the order of execution of steps 101 and 102. 102 may be performed before or after 101, or may be performed concurrently with 101, all of which fall within the scope of embodiments of the present invention.
  • the mobile state of the UE may be determined according to the number of times the cell replacement occurs at a predetermined time.
  • the mobile state of the UE can be divided into three levels, a gpHigh-mobility state (high-speed mobile state), a medium-mobility state (medium mobility state), and a BNormal-mobility state (normal mobile state) in LTE, and specific reference can be made to 3GPP. TS36. Content of 304Va. 1. 0.
  • the UE may obtain the moving speed by other means, for example, by using a GPS (Global Positioning System). 103. Perform a cell change decision for the target cell according to the mobile state or the moving speed of the user equipment. For example, the user equipment in the connected state performs a cell handover decision, and the user equipment in the idle state performs a cell reselection decision.
  • the moving state of the user equipment is a high-speed mobile state or the moving speed of the user equipment is greater than or equal to the speed threshold, determining that the target cell is in a prohibited state, or determining that the reporting of the A3 event is not triggered, or The target cell is placed in the cell reselection candidate list.
  • the mobile device is in a high-speed mobile state or the moving speed of the user equipment is greater than or equal to a speed threshold, when the user equipment is in the connected state, when the cell replacement decision is performed, it corresponds to The cell-specific offset of the target cell is set to be invalid or 0 dB.
  • the signal quality offset corresponding to the target cell is set to be invalid or 0 dB when performing the cell replacement decision.
  • the mobile state of the user equipment is a medium or normal mobile state or the moving speed of the user equipment is less than a speed threshold
  • the cell list may be ignored when performing the cell change determination, according to an existing manner. judgment.
  • a decision parameter based on a mobile state or a moving speed scaling is used when performing a cell change decision, and when determining that the target cell is a macro cell, performing cell replacement The decision parameters based on the motion state or the moving speed scaling are not used in the decision.
  • the embodiment of the present invention considers the mobile state or the moving speed of the user equipment in the process of performing the cell replacement decision for the micro cell, so as to reduce unnecessary cell replacement for the micro cell, thereby reducing the frequent cell replacement.
  • 2 is a flow chart of a cell replacement method according to another embodiment of the present invention. The method of Figure 2 is performed by a base station.
  • the cell list includes cell identifiers of one or more cells.
  • one or more cells in the cell list are all micro cells, or one or more cells in the cell list are macro cells.
  • the base station may send the cell list to the user equipment by using dedicated signaling or system broadcast.
  • the embodiment of the present invention considers the cell list sent by the base station and the mobile state of the user equipment in the process of performing the cell replacement decision, so as to reduce unnecessary cell replacement, thereby reducing the system burden caused by frequent cell replacement.
  • User equipment power consumption Embodiments of the present invention are described in more detail below with reference to specific examples. FIG.
  • FIG. 3 is a schematic flow chart of a cell replacement process according to an embodiment of the present invention.
  • the UE represents a user equipment
  • the eNodeB represents a base station of the current serving cell of the UE.
  • the invention is not limited to communication systems represented by these specific terms, and other forms of user equipment and base stations may similarly be employed in other types of communication systems. These variations are all within the scope of embodiments of the invention.
  • 301. receives a cell list sent by an eNodeB, where the cell list includes a cell identifier of one or more cells.
  • the cell identifier may be a physical ID of a cell, such as a PCI (Physical Cell Identity).
  • the embodiment of the present invention is not limited thereto, and other forms of cell identifiers, such as an Evolved Cell Global Identifier (ECGI), may be used.
  • the cell included in the cell list may be a micro cell within the coverage of the eNodeB, or may be a macro cell adjacent to the eNodeB.
  • the base station may implicitly or explicitly indicate to the UE whether the cell identifier included in the cell list is a micro cell or a macro cell.
  • the eNodeB may broadcast the cell list in a cell broadcast, or may send the cell list to the UE in the connected state by using dedicated signaling.
  • the UE determines its own mobile state or moving speed.
  • the execution order of 302 may be after 301, or may be performed before 301, or concurrently with 301, which is not limited by the present invention.
  • the UE performs a cell change decision for the target cell according to the mobile state or the moving speed determined in 302, and the cell list received in 301.
  • the UE may determine whether to use a mobile state or a moving speed scaling based decision parameter when performing a cell replacement decision according to whether the cell list includes a cell identifier of the target cell.
  • a decision parameter based on the mobile state or the moving speed scaling is used when performing the cell replacement decision.
  • the scaling of the decision parameters may be performed according to the method of scaling the decision parameters according to the speed in the prior art.
  • the decision parameter based on the mobile state or the moving speed scaling is not used when performing the cell replacement decision.
  • the scenario in which the current serving cell is the cell A and the target cell is the cell B If the cell in the cell list received by the UE is a micro cell, when the cell list includes the cell identity of the cell B, the target cell is tiny.
  • the UE performs the scaling of the decision parameters, and then according to the scaling process If the cell in the cell list received by the UE is a macro cell, if the cell list includes the cell identity of the cell B, indicating that the target cell is a macro cell, the UE does not execute the decision parameter.
  • the zoom It can be seen that, in the cell replacement decision, if the target cell is a micro cell, the scaling of the decision parameter is performed, and then the cell replacement decision is performed according to the decision parameter after the scaling process. In this way, unnecessary switching times can be reduced.
  • the cell identifier performs a cell replacement decision for the target cell. For example, when the cell list includes the cell identity of the target cell, determine that the target cell is in a Barred state, or determine not to trigger the reporting of the A3 event (for the UE in the connected state), or determine not to place the target cell in the cell reselection. In the candidate list (for UEs in idle state).
  • the UE may receive the speed threshold sent by the base station through dedicated signaling or system broadcast.
  • the speed threshold is notified to the UE in proprietary RRC signaling.
  • the speed threshold is notified to the UE in the system broadcast. In this way, when the UE speed is high, the cells in the cell list are not switched or reselected, and unnecessary replacement times can be reduced.
  • each micro cell covered by the macro cell is listed in the cell list, which can avoid switching or reselection of the high-speed UE between the macro cell and the micro cell, thereby reducing the system signaling burden.
  • the step of generating a cell list by the eNodeB may be further included before the 301, where the cell list generated by the eNodeB may include one or more corresponding to one or more cell identifiers. The offset of the cell-specific offset of the cell and/or the offset of the signal quality offset corresponding to one or more cells, respectively.
  • the offset of the cell-specific offset may be recorded as OcnOff set; for the UE in the idle state, the offset of the signal quality offset may be recorded as Q2offset.
  • OcnOff set when the mobile state of the UE is a high-speed mobile state or the moving speed of the UE is greater than or equal to the speed threshold, if the UE is in the connected state, the target corresponding to the target is used when performing the cell replacement decision.
  • the offset of the cell-specific offset of the cell, OcnOffset if the UE is in an idle state, uses an offset Q2offset corresponding to the signal quality offset of the target cell when performing the cell change decision.
  • the offset corresponding to the cell-specific offset of the target cell or the signal corresponding to the target cell is not used when performing the cell change decision.
  • the offset of the mass offset is as follows (refer to the content in 3GPP TS36.304Va.1.0 for details):
  • Mn is the measurement result of the neighboring cell (ie, the above target cell), and does not consider any offset
  • Ofn is the frequency specificity of the frequency of the target cell.
  • Offset Ocn is the cell-specific offset of the target cell
  • Hys is the hysteresis parameter of the event
  • Mp is the measurement result of the PCel l (ie, the current serving cell) of the primary cell, without considering any bias
  • Ofp The frequency-specific offset of the primary frequency
  • Ocp is the cell-specific offset of the primary cell
  • Off is the offset parameter of the event.
  • the above 0cp and Ocn are cell-level parameters, that is, each cell has its own parameters. In the embodiment of the present invention, when the UE is in a high-speed moving state or the moving speed is greater than a speed threshold,
  • Ocn can also be invalid or 0dB, ⁇ :
  • the offset OcnOffset regarded as the cell-specific offset of the target cell is invalid or 0 dB.
  • the above trigger condition may be used in conjunction with whether the target cell is included in the cell list. For example, when the UE is in the high-speed mobile state or the moving speed is greater than the speed threshold, if the target cell is included in the cell list, the decision may be made according to the above condition (2) or (3); if not included in the cell list
  • the target cell may perform the decision according to the above condition (3), or may perform the decision according to the above condition (1).
  • the UE sorts the candidate cells, for example, sorting the candidate cells according to the existing R criterion, and then selecting the best-sorted cell as the target cell for cell reselection.
  • the existing R criteria are as follows (refer to the contents of 3GPP TS36. 304Va.1.0 for details):
  • Rn Qmeas, n-Qoff set-Q2off set, (5)
  • the UE's mobile state is normal or medium moving speed, or when the UE's moving speed does not reach the speed threshold, it is regarded as the signal quality offset of the cell.
  • the shift Q20ffset is invalid or 0dB.
  • the cell replacement decision such as the A3 event trigger condition or the R criterion
  • the number of unnecessary cell replacements can be reduced.
  • the above embodiments may also be used in combination with each other.
  • the cell list does not include the offset of the signal quality offset
  • the cell-specific offset Ocn or signal corresponding to the target cell may be performed when performing the cell change determination.
  • the mass offset Qoffset is set to be invalid or 0dB.
  • the parameters in the conditions (1) - (5) may be scaled according to the moving speed of the UE when the decision is performed.
  • the first determining unit 41 determines that the target cell of the cell replacement is a micro cell, and the cell replacement includes cell reselection or cell handover.
  • the second determining unit 42 determines the moving state or moving speed of the user equipment.
  • the decision unit 43 performs a cell change decision for the target cell based on the mobile state or the moving speed of the user equipment determined by the second determining unit 42.
  • the embodiment of the present invention considers the mobile state or the moving speed of the user equipment in the process of performing the cell replacement decision for the micro cell, so as to reduce unnecessary cell replacement for the micro cell, thereby reducing the frequent cell replacement. System burden and user equipment power consumption.
  • the user equipment 40 may perform various operations related to the UE in the above method, and a detailed description is omitted as appropriate to avoid redundancy.
  • the user equipment 40 may further include a receiving unit 44, which receives a cell list sent by the base station, where the cell list includes cell identifiers of one or more cells.
  • the first determining unit 41 may determine that the target cell is a micro cell if the cells in the cell list are all micro cells, and the cell identity of the target cell is included in the cell list.
  • the determining unit 43 determines that the target cell is in a prohibited state, or determines that the A3 is not triggered, if the moving state of the user equipment is a high-speed mobile state or the moving speed of the user equipment is greater than or equal to a speed threshold. The event is reported, or the target cell is not placed in the cell reselection candidate list.
  • the determining unit 43 performs the cell when the user equipment is in the connected state. When the decision is changed, the cell-specific offset corresponding to the target cell is set to be invalid or 0 dB.
  • the signal quality offset corresponding to the target cell is set to be invalid or 0 dB when performing the cell replacement decision.
  • the determining unit 43 ignores the cell list when performing a cell change decision if the mobile device of the user equipment is in a medium or normal mobile state or the moving speed of the user equipment is less than a speed threshold.
  • the determining unit 43 may be in the case that one or more cells in the cell list are all micro cells, and when the cell list includes the cell identity of the target cell, if the user equipment is in the connected state, Then, when performing the cell replacement decision, the cell-specific offset (for example, Ocn) corresponding to the target cell is set to be invalid or OdB.
  • the signal quality corresponding to the target cell is performed when performing the cell replacement decision.
  • the offset (for example, Qoffset) is set to invalid or OdB.
  • the cell list received by the receiving unit 44 further includes an offset corresponding to a cell-specific offset of the one or more cells and/or an offset of the signal quality offset.
  • the determining unit 43 may use, when the mobile device of the user equipment is in the high-speed mobile state or the moving speed of the user equipment is greater than or equal to the speed threshold, if the user equipment is in the connected state, use the cell corresponding to the target cell when performing the cell replacement decision.
  • the offset of the cell-specific offset (eg, OcnOffset), if the user equipment is in an idle state, uses an offset (eg, Q2offset) corresponding to the signal quality offset of the target cell when performing the cell change decision.
  • an offset corresponding to the cell-specific offset of the target cell when performing the cell replacement decision.
  • an offset corresponding to the signal quality offset of the target cell for example, set to invalid or 0 dB.
  • the decision unit 43 can perform the cell change decision using the above formulas (1) to (5), and the detailed description will not be repeated in order to avoid redundancy.
  • the receiving unit 44 may receive, when the user equipment is in a connected state, a cell list that is sent by the base station through dedicated signaling or system broadcast, or when the user equipment is in an idle state, the receiving base station broadcasts through the system. List of cells sent.
  • the receiving unit 44 may also receive the speed threshold sent by the base station by using dedicated signaling or system broadcast.
  • Figure 5 is a block diagram of a base station in accordance with one embodiment of the present invention.
  • the base station 50 of FIG. 5 includes a generating unit 51 and a transmitting unit
  • the generating unit 51 generates a cell list including cell identifiers of one or more cells.
  • the sending unit 52 sends the cell list generated by the generating unit 51 to the user equipment, so that the user equipment performs a cell change decision for the target cell according to the cell list and the mobile state or the moving speed of the user equipment, where the cell replacement includes cell reselection or cell Switch.
  • the embodiment of the present invention considers the cell list sent by the base station and the mobile state of the user equipment in the process of performing the cell replacement decision, so as to reduce unnecessary cell replacement, thereby reducing the system burden caused by frequent cell replacement.
  • User equipment power consumption The various portions of the base station 50 may perform various operations related to the base station in the above method, and detailed descriptions are omitted as appropriate to avoid redundancy.
  • one or more cells in the cell list generated by the generating unit 51 are micro cells.
  • one or more cells in the cell list generated by the generating unit 51 are macro cells.
  • the cell list generated by the generating unit 51 further includes an offset corresponding to a cell-specific offset of one or more cells and/or a signal quality corresponding to one or more cells, respectively. The offset of the offset.
  • the sending unit 52 may send the cell list to the user equipment by using dedicated signaling or system broadcast.
  • the sending unit 52 may also broadcast the transmission threshold by dedicated signaling or system.
  • a communication system may include the above-described user equipment 40 or base station 50.
  • user equipment 40 or base station 50 Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.
  • 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 units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to 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 functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used 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 magnetic disk or an optical disk, and the like, which can store program codes. .
  • ROM read-only memory
  • RAM random access memory
  • magnetic disk or an optical disk and the like, which can store program codes.

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Abstract

本发明实施例提供一种小区更换的方法和设备。该方法,包括:确定小区更换的目标小区为微小区,小区更换包括小区重选或小区切换;确定用户设备的移动状态或移动速度;根据用户设备的移动状态或移动速度,执行针对目标小区的小区更换判决。本发明实施例在执行针对微小区的小区更换判决的过程中考虑用户设备的移动状态或移动速度,以减少不必要的针对微小区的小区更换,从而降低了由于频繁的小区更换而带来的系统负担和用户设备功耗。

Description

小区更换的方法和设备 本申请要求于 2011年 07月 25日提交中国专利局、 申请号为 201110208551. 3、 发明名 称为 "小区更换的方法和设备"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 本发明实施例涉及通信技术领域, 并且更具体地, 涉及小区更换的方法和设备。 背景技术 无线通信系统可以提供话音、 数据等无线业务。 通常的无线通信系统是多址接入的 无线系统, 如 FDMA (Frequency Division Multiple Access , 频分多址)、 TDMA ( Time Division Multiple Access , 时分多址)、 CDMA (Code Division Multiple Access , 码 分多址)、 0FDMA ( Orthogonal Frequency Division Multiple Access , 正交频分多址)、 SC-FDMA ( Signal Carrier-Frequency Division Multiple Access , 单载波频分多址)。 在无线通信系统中, 基站在下行链路上给用户设备 (UE, User Equipment ) 发射数据和 /或控制信息, 并在上行链路上接收 UE发送的数据和 /或控制信息。 类似地, UE在上行 链路上向基站传输数据和 /或控制信息, 并在下行链路上接收基站发射的数据和 /或控制 信息。
UE在无线网络中, 会选择信号质量最好的小区驻留并获得网络的服务。 在 UE移动 过程中, 根据当前服务的小区和邻区的信号质量的比较来选择并更换服务小区。 在 UE 空闲状态下, 这种小区更换叫做小区重选 (cel l reselection), 在 UE连接状态下, 这 种小区更换叫做小区切换(cel l handover^ 对于高速移动的 UE, 这种小区更换会比较 频繁。
这种频繁的小区更换, 不仅加重了系统的信令负担和吞吐量, 也会增加 UE的功耗 和更换失败率。 发明内容
本发明一方面提供了一种小区更换的方法, 包括: 确定小区更换的目标小区为微小 区, 小区更换包括小区重选或小区切换; 确定用户设备的移动状态或移动速度; 根据用 户设备的移动状态或移动速度, 执行针对目标小区的小区更换判决。 本发明另一方面提供了一种小区更换的方法, 包括: 生成小区列表, 小区列表包括 一个或多个小区的小区标识; 向用户设备发送所述小区列表, 以便用户设备根据所述小 区列表以及用户设备的移动状态或移动速度, 执行针对目标小区的小区更换判决, 小区 更换包括小区重选或小区切换。
本发明另一方面提供了一种用户设备, 包括: 第一确定单元, 用于确定小区更换的 目标小区为微小区, 小区更换包括小区重选或小区切换; 第二确定单元, 用于确定用户 设备的移动状态或移动速度; 和判决单元, 用于根据用户设备的移动状态或移动速度, 执行针对目标小区的小区更换判决。
本发明另一方面提供了一种基站, 包括: 生成单元, 用于生成小区列表, 上述小区 列表包括一个或多个小区的小区标识; 和发送单元, 用于向用户设备发送生成单元生成 的小区列表, 以便用户设备根据小区列表以及用户设备的移动状态或移动速度, 执行针 对目标小区的小区更换判决, 上述小区更换包括小区重选或小区切换。
本发明实施例在执行针对微小区的小区更换判决的过程中考虑用户设备的移动状 态或移动速度, 以减少不必要的针对微小区的小区更换, 从而降低了由于频繁的小区更 换而带来的系统负担和用户设备功耗。 附图说明 为了更清楚地说明本发明实施例的技术方案, 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 附图获得其他的附图。
图 1是本发明一个实施例的小区更换方法的流程图。
图 2是本发明另一实施例的小区更换方法的流程图。
图 3是本发明一个实施例的小区更换过程的示意流程图。
图 4是本发明一个实施例的用户设备的框图。
图 5是本发明一个实施例的基站的框图。 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作出创造性劳动前提下所获得的所有其他 实施例, 都属于本发明保护的范围。 本发明的技术方案, 可以应用于各种通信系统, 例如: 全球移动通讯系统 (Global
System of Mobi le communication, GSM),码分多址系统,宽带码分多址(WCDMA, Wideband Code Division Multiple Access Wireless ) 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) 系统等。 用户设备 (UE, User Equipment ) , 也可称之为移动终端 (Mobi le Terminal ) 、 移动用户设备等, 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, 用户设备可以是移动终端, 如移动电话 (或称为 "蜂窝" 电话) 或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。 基站, 可以是 GSM或 CDMA系统中的基站 (BTS, Base Transceiver Station) , 也可 以是 WCDMA系统中的基站 (NodeB) , 还可以是 LTE系统中的演进型基站 (eNB或 e_NodeB, evolutional Node B) , 或者是接入点 (AP, Access Point ) , 本发明并不限定。 以下将以 LTE ( Long Term Evolution, 长期演进) 或 LTE- A ( LTE-Advanced, 先进 的长期演进) 无线通信系统为例, 阐述本发明的实施例。 为了满足或提升 LTE-A的性能需求, 在同构网络 (homogeneous network)内部署不同 类型或不同制式的基站, 如低发射功率的基站或发射 /接收节点, 以增强网络的覆盖和 性能, 这样的网络结构被称之为异构网络(Heterogeneous network)。 上述低发射功率 的基站或发射 /接收节点例如 Micro BS (微基站) , Pico BS (微微基站) , Home BS (家 庭基站) , f emto BS (毫微微基站) , Relay BS (中继基站) , RRH ( Remote Radio Head, 射频拉远头) 等。 异构网络中部署的大发射功率基站(如宏基站, Macro eNodeB, MeNB) 和低发射功率基站(简称低功率基站, lower power node, LPN)相比, 往往 LPN的小区(可 称为 "微小区" ) 的覆盖相对小于宏基站的小区 (可称为 "宏小区" ) 的覆盖。 由于微小区的大量引入, 并且微小区半径很小, 所以当高速 UE穿过微小区时, 可能 刚刚切换或重选到微小区, 又切换或重选出去。 例如在微小区的驻留时间小于 1秒。 这 种切换是不必要的切换。 对于连接状态的 UE, 增加的小区中切换的次数, 会增加网路侧的信令负荷和系统的 吞吐量, 同时这种场景下的切换会增加 UE切换的失败率、掉话等,严重影响用户的感受。 对于空闲状态下的高速移动 UE, 重选到微小区的次数增加也会带来 UE功率消耗等问题。 本发明实施例在执行针对微小区的小区更换判决时, 考虑用户设备的速度, 以减少 不必要的小区更换。 图 1是本发明一个实施例的小区更换方法的流程图。 图 1的方法由用户设备执行。
101, 确定小区更换的目标小区为微小区, 小区更换包括小区重选或小区切换。 例如, 对于处于连接状态的用户设备, 上述小区更换是指小区切换; 对于处于空闲 状态的用户设备, 上述小区更换是指小区重选。 可选地, 作为一个实施例, 用户设备可接收基站发送的小区列表, 并根据小区列表 确定小区更换的目标小区是否为微小区。 小区列表包括一个或多个小区的小区标识。 例 如,如果小区列表中的小区都是微小区,并且目标小区的小区标识包含在该小区列表中, 则确定目标小区是微小区。 本发明实施例不限于通过基站发送的小区列表来识别微小区,用户设备也可以根据 其他方式确定目标小区是否为微小区。 这些修改均落入本发明实施例的范围内。 102, 确定用户设备的移动状态或移动速度。 本发明实施例对步骤 101和 102的执行顺序不做限制。 102可以在 101之前或之后执 行, 也可以与 101同时执行, 这些变化均落入本发明实施例的范围内。 可选地, 作为一个实施例, 在 LTE中, 可按照规定时间发生小区更换的次数来判断 UE的移动状态。 例如可以在 LTE中将 UE的移动状态分为三个等级, gpHigh-mobility状态 (高速移动状态) , Medium- mobility状态 (中等移动状态) 禾 BNormal-mobility状态 (正常移动状态) , 具体可参考 3GPP TS36. 304Va. 1. 0中的内容。 可选地,作为另一实施例, UE可以通过其他方式得到移动速度,例如通过 GPS (Global Positioning System; 全球定位系统) 。 103, 根据用户设备的移动状态或移动速度, 执行针对目标小区的小区更换判决。 例如, 处于连接状态的用户设备执行小区切换判决, 处于空闲状态的用户设备执行 小区重选判决。 可选地, 作为一个实施例, 如果用户设备的移动状态为高速移动状态或者用户设备 的移动速度大于或等于速度阈值, 则确定目标小区为禁止状态, 或者确定不触发 A3事件 的上报, 或者不将目标小区放在小区重选候选列表中。 可选地, 作为另一实施例, 如果用户设备的移动状态为高速移动状态或者用户设备 的移动速度大于或等于速度阈值, 则当用户设备处于连接状态时, 在执行小区更换判决 时将对应于所述目标小区的小区特定偏量设为无效或 0dB, 当用户设备处于空闲状态时, 在执行小区更换判决时将对应于目标小区的信号质量偏量设为无效或 0dB。 可选地, 作为另一实施例, 如果用户设备的移动状态为中等或正常移动状态或者用 户设备的移动速度小于速度阈值, 则在执行小区更换判决时可忽略上述小区列表, 按照 现有方式进行判决。 可选地, 作为另一实施例, 当确定目标小区是微小区时, 在执行小区更换判决时使 用基于移动状态或移动速度縮放的判决参数, 当确定目标小区是宏小区时, 在执行小区 更换判决时不使用基于移动状态或移动速度縮放的判决参数。 本发明实施例在执行针对微小区的小区更换判决的过程中考虑用户设备的移动状 态或移动速度, 以减少不必要的针对微小区的小区更换, 从而降低了由于频繁的小区更 换而带来的系统负担和用户设备功耗。 图 2是本发明另一实施例的小区更换方法的流程图。 图 2的方法由基站执行。
201, 生成小区列表, 该小区列表包括一个或多个小区的小区标识。 可选地, 作为一个实施例, 小区列表中的一个或多个小区都为微小区, 或者小区列 表中的一个或多个小区都为宏小区。
202, 向用户设备发送小区列表, 以便用户设备根据小区列表以及用户设备的移动 状态或移动速度, 执行针对目标小区的小区更换判决, 其中上述小区更换包括小区重选 或小区切换。 可选地, 作为一个实施例, 基站可通过专用信令或系统广播向用户设备发送小区列 表。 本发明实施例在执行小区更换判决的过程中同时考虑基站下发的小区列表和用户 设备的移动状态, 以减少不必要的小区更换, 从而降低了由于频繁的小区更换而带来的 系统负担和用户设备功耗。 下面结合具体例子, 更加详细地描述本发明的实施例。 图 3是本发明一个实施例的 小区更换过程的示意流程图。 图 3中 UE表示用户设备, eNodeB表示 UE的当前服务小区的 基站。 但是本发明不限于这些具体术语所代表的通信系统, 在其他类型的通信系统中, 可类似地采用其他形式的用户设备和基站。 这些变化均落入本发明实施例的范围内。 301, UE接收 eNodeB发送的小区列表, 该小区列表包括一个或多个小区的小区标识。 可选地, 作为一个实施例, 上述小区标识可以是小区的物理 ID, 例如 PCI (Physical Cell Identity, 物理小区标识) 。 但本发明实施例不限于此, 也可以采用其他形式的 小区标识, 如 ECGI (Evolved Cell Global Identifier, 演进的小区全局标识) 。 可选地, 作为一个实施例, 小区列表中包括的小区可以是 eNodeB覆盖范围内的微小 区, 也可以是 eNodeB相邻的宏小区。 在此情况下, 基站可以隐式或显式地向 UE指示小区 列表中包括的是微小区还是宏小区的小区标识。 可选地, 作为另一实施例, eNodeB可以在小区广播中广播这个小区列表, 也可以通 过专用信令向连接状态的 UE发送该小区列表。
302, UE确定自己的移动状态或者移动速度。 302的执行顺序可以在 301之后, 也可 以在 301之前, 或者与 301同时执行, 本发明对此不作限制。
303, UE根据 302中确定的移动状态或移动速度, 以及 301中接收的小区列表, 进行 针对目标小区的小区更换判决。 可选地, 作为一个实施例, 在图 3的 303中, UE可根据小区列表是否包括目标小区的 小区标识,确定在执行小区更换判决时是否使用基于移动状态或移动速度縮放的判决参 数。 具体地, 在小区列表中的一个或多个小区都为微小区的情况下, 当小区列表包括目 标小区的小区标识时,在执行小区更换判决时使用基于移动状态或移动速度縮放的判决 参数。 可按照现有技术中根据速度对判决参数进行縮放方式, 进行判决参数的縮放, 具 体可参考 3GPP TS36. 304Va. 1. 0中的内容。 或者, 在小区列表中的一个或多个小区为宏 小区的情况下, 当小区列表包括目标小区的小区标识时, 在执行小区更换判决时不使用 基于移动状态或移动速度縮放的判决参数。 例如: 当前服务小区为小区 A, 目标小区为 小区 B的场景: 如果 UE收到的小区列表中的小区都为微小区, 当该小区列表中包含小区 B 的小区标识时, 说明目标小区为微小区, 则 UE执行判决参数的縮放, 然后按照縮放处理 后的判决参数进行小区更换判决; 如果 UE收到的小区列表中的小区都为宏小区, 当该小 区列表中包含小区 B的小区标识时, 说明目标小区为宏小区, 则 UE不执行判决参数的縮 放。 可见, 在小区更换判决时, 如果目标小区为微小区, 则执行判决参数的縮放, 然后 按照縮放处理后的判决参数进行小区更换判决。 这样, 能够减少不必要的切换次数。 可选地, 作为另一实施例, 在图 3的 303中, 当用户设备的移动状态为高速移动状态 或者用户设备的移动速度大于或等于速度阈值时,根据小区列表是否包括所述目标小区 的小区标识, 执行针对目标小区的小区更换判决。 例如, 在小区列表包括目标小区的小 区标识时, 确定目标小区为禁止 (Barred)状态, 或者确定不触发 A3事件的上报 (对于 连接状态的 UE),或者确定不将目标小区放在小区重选候选列表中(对于空闲状态的 UE)。 另一方面, 当用户设备的移动状态为中等或正常移动状态或者用户设备的移动速度 小于速度阈值时,在执行小区更换判决时忽略上述小区列表, 即,将小区列表视为无效。 对于上述速度阈值, UE可通过专用信令或系统广播, 接收基站发送的速度阈值。 例 如, 对于连接状态的 UE来说, 该速度阈值在专有的 RRC信令中通知给 UE。 对于空闲状态 的 UE来说, 该速度阈值在系统广播中通知给 UE。 这样, 当 UE速度较高时, 不会切换或重选到小区列表中的小区, 能够减少不必要的 更换次数。 特别是在异构网络下, 在小区列表中列出宏小区所覆盖的各个微小区, 能避 免高速 UE在宏小区和微小区之间的切换或重选, 减少了系统信令负担。 可选地, 作为另一实施例, 在 301前还可以包含 eNodeB生成小区列表的步骤, 该 eNodeB生成的小区列表除了包括一个或多个小区的小区标识,还可以包括分别对应于一 个或多个小区的小区特定偏量的偏移量和 /或分别对应于一个或多个小区的信号质量偏 量的偏移量。下文中,对于连接状态的 UE,上述小区特定偏量的偏移量可记为 OcnOff set ; 对于空闲状态的 UE, 该信号质量偏量的偏移量可记为 Q2offset。 在此情况下, 在图 3的 303中, 当 UE的移动状态为高速移动状态或者 UE的移动速度大 于或等于速度阈值时, 如果 UE处于连接状态, 则在执行小区更换判决时使用对应于目标 小区的小区特定偏量的偏移量 OcnOffset , 如果 UE处于空闲状态, 则在执行小区更换判 决时使用对应于目标小区的信号质量偏量的偏移量 Q2offset。当 UE的移动状态为中等或 正常移动状态或者用户设备的移动速度小于速度阈值时,在执行小区更换判决时不使用 对应于目标小区的小区特定偏量的偏移量或对应于目标小区的信号质量偏量的偏移量。 具体地, 对于连接状态的 UE, 目前规定的 A3事件的触发条件如下(具体可参考 3GPP TS36. 304Va. 1. 0中的内容) :
Mn+0fn+0cn-Hys>Mp+0fp+0cp+0ff, (1) 其中, Mn为邻区 (即上述目标小区) 的测量结果, 不考虑任何偏量; Ofn为目标小 区的频率的频率特定偏量; Ocn为所述目标小区的小区特定偏量; Hys为事件的滞后参数 (hysteresis parameter); Mp为主小区 PCel l (即, 当前服务小区) 的测量结果, 不考 虑任何偏量; Ofp为主频的频率特定偏量; Ocp为主小区的小区特定偏量; Off为事件的 偏置参数。 上述 0cp、 Ocn是小区级别的参数, 也就是每个小区都有自己的参数。 而在本发明实施例中, 当 UE处于高速移动状态时或者移动速度大于速度阈值时, 则
A3事件的触发条件中考虑 OcnOf f set。
Mn+0fn+0cn-Hys>Mp+0fp+0cp+0ff+0cn0ffset, (2) 另外, 可替换地, 本实施例也可以视 Ocn无效或者 0dB, 艮卩:
Mn+0fn-Hys〉Mp+0fp+0cp+0ff。 (3) 当 UE的移动状态为正常或者中等时, 或者 UE的移动速度没有达到速度阈值时, 视为 该目标小区的小区特定偏量的偏移量 OcnOffset为无效或者 0dB。 上述触发条件可结合小区列表中是否包括目标小区的情况进行使用。 例如, 在 UE处 于高速移动状态时或者移动速度大于速度阈值的情况下, 如果目标小区被包括在小区列 表中, 则可以按照上述条件 (2)或 (3)进行判决; 如果小区列表中没有包括目标小区, 则 可以按照上述条件 (3)进行判决, 也可以按照上述条件(1)进行判决。 对于空闲状态的 UE来说, UE对候选小区进行排序, 例如按照现有 R准则排序候选小 区,然后选择排序最好的小区为小区重选的目标小区。现有 R准则如下(具体可参考 3GPP TS36. 304Va. 1. 0中的内容) :
Rs=Qmeas, s+QHyst Rn=Qmeas, n-Qoffset , (4) 其中, Qmeas, s和 Qmeas,n为小区重选时使用的测量量, 如 RSRP (Reference Signal Receiving Power, 参考信号接收功率)测量量; QHyst为当前服务小区的信号滞后量, Qoffset为目标小区的信号质量偏量。 另外, 可替换地, UE处于高速移动状态时或者 UE速度大于速度阈值时, 本实施例也 可以视 Qoffset为无效或者 0dB。 而在本发明实施例中, 当 UE处于高速移动状态时或者 UE速度大于速度阈值时, R准 则定义为
Rs=Qmeas, s+QHyst
Rn=Qmeas, n-Qoff set-Q2off set , (5) 当 UE的移动状态为正常或者中等移动速度时, 或者 UE的移动速度没有达到速度阈值 时, 视为该小区的信号质量偏量的偏移量 Q20ffset为无效或者 0dB。 这样, 在 UE的速度较高时, 小区更换判决 (例如 A3事件触发条件或 R准则) 会更加 严格, 能够减少不必要的小区更换次数。 可选地, 上述实施例也可以相互组合使用。 例如, 如果小区列表中不包括上述信号 质量偏量的偏移量, 则在小区列表包括目标小区的小区标识时, 在执行小区更换判决时 可以将对应于目标小区的小区特定偏量 Ocn或信号质量偏量 Qoffset设为无效或 0dB。 或 者, 在另一实施例中, 在执行判决时, 可以按照 UE的移动速度对条件(1) - (5)中的参数 进行縮放。 这些变化均落入本发明实施例的范围内。 图 4是本发明一个实施例的用户设备的框图。 图 4的用户设备 40包括第一确定单元 41、 第二确定单元 42和判决单元 43。 第一确定单元 41确定小区更换的目标小区为微小区, 小区更换包括小区重选或小区 切换。 第二确定单元 42确定用户设备的移动状态或移动速度。 判决单元 43根据第二确定 单元 42确定的用户设备的移动状态或移动速度, 执行针对目标小区的小区更换判决。 本发明实施例在执行针对微小区的小区更换判决的过程中考虑用户设备的移动状 态或移动速度, 以减少不必要的针对微小区的小区更换, 从而降低了由于频繁的小区更 换而带来的系统负担和用户设备功耗。 用户设备 40的各个部分可执行上述方法中涉及 UE的各个操作, 为避免重复, 适当省 略详细的描述。 可选地, 作为一个实施例, 如图 4所示, 用户设备 40还可以包括接收单元 44, 接收 基站发送的小区列表, 小区列表包括一个或多个小区的小区标识。 第一确定单元 41可以 在小区列表中的小区都是微小区, 并且目标小区的小区标识包含在小区列表中的情况 下, 确定目标小区是微小区。 可选地, 在一个实施例中, 判决单元 43在用户设备的移动状态为高速移动状态或者 用户设备的移动速度大于或等于速度阈值的情况下, 确定目标小区为禁止状态, 或者确 定不触发 A3事件的上报, 或者不将目标小区放在小区重选候选列表中。 可选地, 作为另一实施例, 判决单元 43在用户设备的移动状态为高速移动状态或者 用户设备的移动速度大于或等于速度阈值的情况下, 则当用户设备处于连接状态时, 在 执行小区更换判决时将对应于目标小区的小区特定偏量设为无效或 0dB, 当用户设备处 于空闲状态时, 在执行小区更换判决时将对应于目标小区的信号质量偏量设为无效或 0dB。 可选地, 作为另一实施例, 判决单元 43在用户设备的移动状态为中等或正常移动状 态或者用户设备的移动速度小于速度阈值的情况下, 则在执行小区更换判决时忽略所述 小区列表。 可选地, 作为另一实施例, 判决单元 43可以在小区列表中的一个或多个小区都为微 小区的情况下, 在小区列表包括目标小区的小区标识时, 如果用户设备处于连接状态, 则在执行小区更换判决时将对应于目标小区的小区特定偏量 (例如, Ocn) 设为无效或 OdB, 如果用户设备处于空闲状态, 则在执行小区更换判决时将对应于目标小区的信号 质量偏量 (例如, Qoffset ) 设为无效或 OdB。 可选地, 作为另一实施例, 接收单元 44接收的小区列表还包括分别对应于一个或多 个小区的小区特定偏量的偏移量和 /或信号质量偏量的偏移量。 此时, 判决单元 43可以 在用户设备的移动状态为高速移动状态或者用户设备的移动速度大于或等于速度阈值 时, 如果用户设备处于连接状态, 则在执行小区更换判决时使用对应于目标小区的小区 特定偏量的偏移量 (例如 OcnOffset ) , 如果用户设备处于空闲状态, 则在执行小区更 换判决时使用对应于目标小区的信号质量偏量的偏移量(例如 Q2offset ) 。 或者, 当用 户设备的移动状态为中等或正常移动状态或者用户设备的移动速度小于速度阈值时,判 决单元 43可以在执行小区更换判决时不使用对应于目标小区的小区特定偏量的偏移量 或对应于目标小区的信号质量偏量的偏移量, 例如设为无效或 0dB。 例如, 判决单元 43 可以利用上述公式(1) _ (5)执行小区更换判决, 为避免重复, 不再详细描述。 可选地, 作为另一实施例, 接收单元 44可以在用户设备处于连接状态时, 接收基站 通过专用信令或系统广播发送的小区列表, 或者在用户设备处于空闲状态时, 接收基站 通过系统广播发送的小区列表。 可选地, 作为另一实施例, 在需要使用速度阈值时, 接收单元 44还可以通过专用信 令或系统广播接收基站下发的速度阈值。 图 5是本发明一个实施例的基站的框图。 图 5的基站 50包括生成单元 51和发送单元
52。 生成单元 51生成小区列表, 该小区列表包括一个或多个小区的小区标识。 发送单元 52向用户设备发送生成单元 51生成的小区列表, 以便用户设备根据小区列表以及用户设 备的移动状态或移动速度, 执行针对目标小区的小区更换判决, 其中上述小区更换包括 小区重选或小区切换。 本发明实施例在执行小区更换判决的过程中同时考虑基站下发的小区列表和用户 设备的移动状态, 以减少不必要的小区更换, 从而降低了由于频繁的小区更换而带来的 系统负担和用户设备功耗。 基站 50的各个部分可执行上述方法中涉及基站的各个操作, 为避免重复, 适当省略 详细的描述。 可选地, 在一个实施例中, 生成单元 51生成的小区列表中的一个或多个小 区为微小区。 或者, 生成单元 51生成的小区列表中的一个或多个小区为宏小区。 可选地, 作为另一实施例, 生成单元 51生成的小区列表还包括分别对应于一个或多 个小区的小区特定偏量的偏移量和 /或分别对应于一个或多个小区的信号质量偏量的偏 移量。 可选地, 作为另一实施例, 发送单元 52可以通过专用信令或系统广播向用户设备发 送小区列表。 可选地, 作为另一实施例, 在需要使用速度阈值时, 发送单元 52还可以通过专用信 令或系统广播发送速度阈值。 根据本发明实施例的通信系统可包括上述用户设备 40或基站 50。 本领域普通技术人员可以意识到, 结合本文中所公开的实施例描述的各示例的单元 及算法步骤, 能够以电子硬件、 或者计算机软件和电子硬件的结合来实现。 这些功能究 竟以硬件还是软件方式来执行, 取决于技术方案的特定应用和设计约束条件。 专业技术 人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认 为超出本发明的范围。 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。 所述作为分离部件说明的单元可以是或者也可以不是物理上分开的, 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。 所述功能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)、 随机存取存储器 (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, 仅为本发明的具体实施方式, 但本发明的保护范围并不局限于此, 任何 熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易想到变化或替换, 都应 涵盖在本发明的保护范围之内。 因此, 本发明的保护范围应所述以权利要求的保护范围 为准。

Claims

权利要求
1、 一种小区更换的方法, 其特征在于, 包括:
确定小区更换的目标小区为微小区, 所述小区更换包括小区重选或小区切换; 确定用户设备的移动状态或移动速度;
根据所述用户设备的移动状态或移动速度, 执行针对所述目标小区的小区更换判 决。
2、 如权利要求 1所述的方法, 其特征在于, 所述方法还包括:
接收基站发送的小区列表, 所述小区列表包括一个或多个小区的小区标识; 所述确定小区更换的目标小区为微小区, 包括:
如果所述小区列表中的小区都是微小区, 并且所述目标小区的小区标识包含在所述 小区列表中, 则确定所述目标小区是微小区。
3、 如权利要求 1或 2所述的方法, 其特征在于, 所述根据所述用户设备的移动状态 或移动速度, 执行针对目标小区的小区更换判决, 包括:
如果所述用户设备的移动状态为高速移动状态或者所述用户设备的移动速度大于 或等于速度阈值, 则确定所述目标小区为禁止状态, 或者确定不触发 A3事件的上报, 或 者不将所述目标小区放在小区重选候选列表中。
4、 如权利要求 1或 2所述的方法, 其特征在于, 所述根据所述用户设备的移动状态 或移动速度, 执行针对目标小区的小区更换判决, 包括:
如果所述用户设备的移动状态为高速移动状态或者所述用户设备的移动速度大于 或等于速度阈值, 则
当所述用户设备处于连接状态时,在执行所述小区更换判决时将对应于所述目标小 区的小区特定偏量设为无效或 0dB, 当所述用户设备处于空闲状态时, 在执行所述小区 更换判决时将对应于所述目标小区的信号质量偏量设为无效或 0dB。
5、 如权利要求 2所述的方法, 其特征在于, 所述根据所述用户设备的移动状态或移 动速度, 执行针对目标小区的小区更换判决, 包括:
如果所述用户设备的移动状态为中等或正常移动状态或者所述用户设备的移动速 度小于速度阈值, 则在执行小区更换判决时忽略所述小区列表。
6、 如权利要求 2所述的方法, 其特征在于, 所述小区列表还包括分别对应于所述一 个或多个小区的小区特定偏量的偏移量和 /或分别对应于所述一个或多个小区的信号质 量偏量的偏移量; 所述根据所述用户设备的移动状态或移动速度, 执行针对目标小区的小区更换判 决, 包括:
如果所述用户设备的移动状态为高速移动状态或者所述用户设备的移动速度大于 或等于速度阈值, 则
当所述用户设备处于连接状态时,在执行小区更换判决时使用对应于所述目标小区 的小区特定偏量的偏移量, 当所述用户设备处于空闲状态时, 在执行小区更换判决时使 用对应于所述目标小区的信号质量偏量的偏移量。
7、 如权利要求 6所述的方法, 其特征在于, 所述根据所述用户设备的移动状态或移 动速度, 执行针对目标小区的小区更换判决, 还包括:
如果所述用户设备的移动状态为中等或正常移动状态或者所述用户设备的移动速 度小于速度阈值, 则在执行小区更换判决时不使用对应于所述目标小区的小区特定偏量 的偏移量或对应于所述目标小区的信号质量偏量的偏移量。
8、 如权利要求 6所述的方法, 其特征在于, 所述在执行小区更换判决时使用对应于 所述目标小区的小区特定偏量的偏移量, 包括:
使用如下公式执行所述小区更换判决:
Mn+0fn+0cn-Hys>Mp+0fp+0cp+0ff+0cn0ffset ,
其中 Mn为所述目标小区的测量结果, Ofn为所述目标小区的频率特定偏量, Ocn为所 述目标小区的小区特定偏量, Hys为事件的信号滞后量, Mp为当前服务小区的测量结果, Ofp为当前服务小区的频率特定偏量, Ocp为当前服务小区的小区特定偏量, Off为事件 的偏置参数, OcnOffset为所述目标小区的小区特定偏量的偏移量。
9、 如权利要求 6所述的方法, 其特征在于, 所述在执行小区更换判决时使用对应于 所述目标小区的信号质量偏量的偏移量, 包括:
使用如下公式执行所述小区更换判决:
Rs=Qmeas, s+QHyst
Rn=Qmeas, n-Qoff set-Q2off set ,
其中 Qmeas, s和 Qmeas, n为小区重选时使用的测量量, QHyst为当前服务小区的信号 滞后量, Qoffset为目标小区的信号质量偏量, Q2offset为所述目标小区的信号质量偏 量的偏移量。
10、 如权利要求 1或 2所述的方法, 其特征在于, 所述方法还包括: 当确定所述目标小区是微小区时,在执行小区更换判决时使用基于所述移动状态或 移动速度縮放的判决参数,
当确定所述目标小区是宏小区时,在执行小区更换判决时不使用基于所述移动状态 或移动速度縮放的判决参数。
11、 如权利要求 2-10任一项所述的方法, 其特征在于, 所述接收基站发送的小区列 表, 包括:
在所述用户设备处于连接状态时,接收所述基站通过专用信令或系统广播发送的所 述小区列表; 或者,
在所述用户设备处于空闲状态时, 接收所述基站通过系统广播发送的所述小区列 表。
12、 如权利要求 2-9任一项所述的方法, 其特征在于, 还包括:
通过专用信令或系统广播, 接收基站发送的所述速度阈值。
13、 一种小区更换的方法, 其特征在于, 包括:
生成小区列表, 所述小区列表包括一个或多个小区的小区标识;
向用户设备发送所述小区列表, 以便所述用户设备根据所述小区列表以及所述用户 设备的移动状态或移动速度, 执行针对目标小区的小区更换判决, 所述小区更换包括小 区重选或小区切换。
14、 如权利要求 13所述的方法, 其特征在于, 所述小区列表中的所述一个或多个小 区都为微小区, 或者所述小区列表中的所述一个或多个小区都为宏小区。
15、 如权利要求 13所述的方法, 其特征在于, 所述小区列表还包括分别对应于所述 一个或多个小区的小区特定偏量的偏移量和 /或分别对应于所述一个或多个小区的信号 质量偏量的偏移量。
16、 如权利要求 13-15任一项所述的方法, 其特征在于, 所述向用户设备发送小区 列表包括: 通过专用信令或系统广播向所述用户设备发送所述小区列表。
17、 如权利要求 16所述的方法, 其特征在于, 通过专用信令或系统广播向所述用户 设备发送速度阈值。
18、 一种用户设备, 其特征在于, 包括:
第一确定单元, 用于确定小区更换的目标小区为微小区, 所述小区更换包括小区重 选或小区切换;
第二确定单元, 用于确定用户设备的移动状态或移动速度; 和 判决单元, 用于根据所述用户设备的移动状态或移动速度, 执行针对所述目标小区 的小区更换判决。
19、 如权利要求 18所述的用户设备, 其特征在于, 还包括:
接收单元, 用于接收基站发送的小区列表, 所述小区列表包括一个或多个小区的小 区标识;
所述第一确定单元进一步用于在所述小区列表中的小区都是微小区, 并且所述目标 小区的小区标识包含在所述小区列表中的情况下, 确定所述目标小区是微小区。
20、 如权利要求 18或 19所述的用户设备, 其特征在于, 所述判决单元进一步用于在 所述用户设备的移动状态为高速移动状态或者所述用户设备的移动速度大于或等于速 度阈值的情况下, 确定所述目标小区为禁止状态, 或者确定不触发 A3事件的上报, 或者 不将所述目标小区放在小区重选候选列表中。
21、 如权利要求 18或 19所述的用户设备, 其特征在于, 所述判决单元进一步用于在 所述用户设备的移动状态为高速移动状态或者所述用户设备的移动速度大于或等于速 度阈值的情况下, 则当所述用户设备处于连接状态时, 在执行所述小区更换判决时将对 应于所述目标小区的小区特定偏量设为无效或 0dB, 当所述用户设备处于空闲状态时, 在执行所述小区更换判决时将对应于所述目标小区的信号质量偏量设为无效或 0dB。
22、 如权利要求 19所述的用户设备, 其特征在于, 所述接收单元接收的小区列表还 包括分别对应于所述一个或多个小区的小区特定偏量的偏移量和 /或分别对应于所述一 个或多个小区的信号质量偏量的偏移量,
所述判决单元,进一步用于在所述用户设备的移动状态为高速移动状态或者所述用 户设备的移动速度大于或等于速度阈值的情况下, 当所述用户设备处于连接状态时, 在 执行小区更换判决时使用对应于所述目标小区的小区特定偏量的偏移量, 当所述用户设 备处于空闲状态时,在执行小区更换判决时使用对应于所述目标小区的信号质量偏量的 偏移量。
23、 如权利要求 22所述的用户设备, 其特征在于, 所述判决单元, 还用于在所述用 户设备的移动状态为中等或正常移动状态或者所述用户设备的移动速度小于速度阈值 的情况下,在执行小区更换判决时不使用对应于所述目标小区的小区特定偏量的偏移量 或对应于所述目标小区的信号质量偏量的偏移量。
24、 如权利要求 18或 19所述的用户设备, 其特征在于, 所述判决单元进一步用于当 确定所述目标小区是微小区时,在执行小区更换判决时使用基于所述移动状态或移动速 度縮放的判决参数, 当确定所述目标小区是宏小区时, 在执行小区更换判决时不使用基 于所述移动状态或移动速度縮放的判决参数。
25、 如权利要求 18-24任一项所述的用户设备, 其特征在于,
所述接收单元进一步用于在所述用户设备处于连接状态时,接收所述基站通过专用 信令或系统广播发送的所述小区列表; 或者, 在所述用户设备处于空闲状态时, 接收所 述基站通过系统广播发送的所述小区列表。
26、 一种基站, 其特征在于, 包括:
生成单元, 用于生成小区列表, 所述小区列表包括一个或多个小区的小区标识; 和 发送单元, 用于向用户设备发送所述生成单元生成的小区列表, 以便所述用户设备 根据所述小区列表以及所述用户设备的移动状态或移动速度,执行针对目标小区的小区 更换判决,
所述小区更换包括小区重选或小区切换。
27、 如权利要求 26所述的基站, 其特征在于, 所述生成单元生成的小区列表中的所 述一个或多个小区都为微小区, 或者所述生成单元生成的小区列表中的所述一个或多个 小区都为宏小区。
28、 如权利要求 26所述的基站, 其特征在于, 所述生成单元生成的小区列表还包括 分别对应于所述一个或多个小区的小区特定偏量的偏移量和 /或分别对应于所述一个或 多个小区的信号质量偏量的偏移量。
29、 如权利要求 26-28任一项所述的基站, 其特征在于,
所述发送单元,进一步用于通过专用信令或系统广播向所述用户设备发送所述小区 列表。
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