WO2015013888A1 - 切换方法和用户设备 - Google Patents

切换方法和用户设备 Download PDF

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Publication number
WO2015013888A1
WO2015013888A1 PCT/CN2013/080428 CN2013080428W WO2015013888A1 WO 2015013888 A1 WO2015013888 A1 WO 2015013888A1 CN 2013080428 W CN2013080428 W CN 2013080428W WO 2015013888 A1 WO2015013888 A1 WO 2015013888A1
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WO
WIPO (PCT)
Prior art keywords
power
increase value
uplink access
transmit power
message
Prior art date
Application number
PCT/CN2013/080428
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English (en)
French (fr)
Inventor
徐宏亮
朱伟
王燕
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 CN201380001790.9A priority Critical patent/CN103650589A/zh
Priority to PCT/CN2013/080428 priority patent/WO2015013888A1/zh
Publication of WO2015013888A1 publication Critical patent/WO2015013888A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/38TPC being performed in particular situations
    • H04W52/50TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/38TPC being performed in particular situations
    • H04W52/40TPC being performed in particular situations during macro-diversity or soft handoff

Definitions

  • the present invention relates to the field of communication technologies, and, more particularly, to a handover method and user equipment. Background technique
  • Mobility management is divided into idle state management and connection state management. An important operation in the connected state is to switch operations.
  • the basic goal of handover is to provide continuous, non-disruptive communication services within the system for mobile terminals.
  • the LTE (Long Term Evolution) system is used as an example.
  • the basic procedure of the handover is as follows:
  • the source cell eNB (Evolved Node B) determines whether the UE needs the UE according to the measurement report reported by the user equipment (UE).
  • Performing cell handover when the source cell eNB determines that the UE needs to perform cell handover, transmitting a handover request message to the target cell eNB; and when the target cell eNB agrees to the handover, transmitting a handover confirm message to the source cell eNB; After the acknowledgment message, the UE sends a handover command to the UE; the UE then initiates a random access procedure; after the UE successfully accesses the target eNB, it sends a handover success message to the target eNB; finally, the UE completes the MME (Mobility Management Entity, mobility management). After the entity) related transfer process, the source cell eNB releases the related resources of the UE, and the handover process ends.
  • MME Mobility Management Entity, mobility management
  • an embodiment of the present invention provides a handover method and a user equipment, which can improve handover performance.
  • a handover method where the method includes: determining a first transmit power of an uplink access message transmitted during a process of handover from a source cell to a target cell, where the first transmit power is higher than normal. a second transmit power of the corresponding uplink access message transmitted during random access; transmitting the uplink access message with the first transmit power.
  • determining a first transmit power of an uplink access message that is sent during a process of switching from a source cell to a target cell includes: determining an uplink connection The power increase value of the incoming message; determining the first transmit power of the uplink access message according to the power increase value.
  • determining, by the power increase value, the first transmit power of the uplink access message includes: determining, according to the following formula, the first transmit power,
  • P H0 Min ⁇ P CMAX , P RA +B ⁇ ,
  • ⁇ . For the first transmit power ⁇ . ⁇ is the maximum transmit power of the user equipment, and P SA is the second transmit power, which is the power increase value.
  • determining a power increase value of the uplink access message includes: acquiring a power increase value carried in a broadcast message of the target cell; or acquiring The power increase value carried in the handover command sent by the base station of the source cell; or, the pre-configured power increase value is obtained.
  • the uplink access message is a preamble message and/or a message three.
  • the embodiment of the present invention provides a user equipment, where the device includes: a determining unit, configured to determine a first transmit power of an uplink access message that is sent during a process of switching from a source cell to a target cell, where the first transmit The power is higher than the second transmit power of the corresponding uplink access message that is sent when the normal random access is performed; and the transmitting unit is configured to transmit the uplink access message by using the first transmit power.
  • the determining unit is further configured to determine a power increase value of the uplink access message, and determine a first transmit power of the uplink access message according to the power increase value.
  • the determining unit is specifically configured to determine the first transmit power according to the following formula
  • P H0 Min ⁇ P CMAX , P RA +B ⁇ ,
  • ⁇ ⁇ is the maximum transmit power of the user equipment
  • P SA is the second transmit power, which is the power increase value
  • the determining unit is specifically configured to: obtain a power increase value carried in a broadcast message of the target cell; or acquire a base station sent by the source cell The power increase value carried in the switch command; or, the pre-configured power increase value is obtained.
  • the uplink access message is a preamble message and/or a message three.
  • the uplink access message is transmitted at a higher transmit power than that used when the normal random access is performed, thereby improving the handover performance.
  • FIG. 1 is a schematic structural diagram of a handover method and a communication system applicable to a user equipment according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a handover method according to an embodiment of the present invention.
  • FIG. 3 is a schematic block diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 4 is a schematic block diagram of a user equipment according to another embodiment of the present invention. detailed description
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • General Packet Radio Service General Packet Radio Service
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • the user equipment User Equipment, the tube is called “UE" It can be called a terminal, a mobile station (Mobile Station, called “MS”), a mobile terminal (Mobile Terminal), etc., and the user equipment can pass through a radio access network (Radio Access Network, called “RAN”” ) communicating with one or more core networks
  • the user device may be a mobile phone (or “cellular” phone), a computer with a mobile terminal, etc., for example, the user device may also be portable, pocket, handheld Mobile computers built into the computer, or in-vehicle, that exchange voice and/or data with the wireless access network.
  • the base station may be a base station (Base Transceiver Station, called “BTS”) in GSM or CDMA, or may be a base station (NodeB, called “NB”) in WCDMA, or may be
  • BTS Base Transceiver Station
  • NodeB NodeB
  • NB base station
  • ENB or e-NodeB The evolved base station (Evolutional Node B, referred to as "ENB or e-NodeB" in LTE is not limited in the present invention.
  • ENB evolved Node B
  • FIG. 1 is a schematic structural diagram of a handover method and a communication system applicable to a user equipment according to an embodiment of the present invention.
  • the communication system of Fig. 1 includes a source base station 110a that controls the source cell 101a, a target base station 110b that controls the target cell 101b, and a UE 120.
  • the present invention does not limit the number of source base stations 110a, target base stations 110b, and UEs 120 in the communication system.
  • the source cell is the current serving cell of UE 120.
  • a communication link is established between the source base station 110a and the UE 120, and the communication link is being used for call and/or data transmission.
  • the source base station 110a sends a handover command to the UE 120 when it determines that the UE 120 needs to handover from the source cell to the target cell and the target base station 110b agrees to the UE 120 to perform handover according to the measurement report reported by the UE 120.
  • the UE 120 After receiving the handover command, the UE 120 starts a random access procedure, and prepares to switch from the source cell to the target cell, that is, prepares to send an uplink access message to the target base station 110b of the target cell.
  • the UE is located at the edge of two cells 101a and 101b. Although both cells 101a and 101b may cover UE 120, UE 120 is generally farther away from the base stations of the two cells. In particular, the distance of the UE 120 from the target base station 110b is relatively long, so the air interface performance between the UE 120 and the target base station 110b is relatively poor. If the specificity of the air interface performance requirement is not considered in the cell switching, the UE still accesses the target base station according to the normal random access mode, which may cause the access failure, which in turn affects the handover performance.
  • FIG. 2 is a schematic flowchart of a handover method according to an embodiment of the present invention.
  • the method of Figure 2 can be performed by a UE, such as UE 120 shown in Figure 1.
  • ordinary random access refers to a simple random access in a general sense, for example, UE, initial access in RRC_IDLE state, or reconnection after radio link failure or out of synchronization In, or random access that needs to be initiated for some special reason in the RRC_CONNECTED state, and so on.
  • the uplink access message is transmitted at a higher transmit power than that used when the normal random access is performed, thereby improving the switching performance.
  • the foregoing uplink access message is a preamble message (Preamble) and/or a message three (Msg3).
  • Preamble preamble
  • Msg3 message three
  • step 210 when determining a first transmit power of an uplink access message that is sent during a process of switching from a source cell to a target cell, determining a power increase value of the uplink access message, The first transmit power of the uplink access message is then determined based on the power increase value.
  • the power increase value may be a preset value.
  • the interference size and the switching success rate may be comprehensively considered, and the value set after the demand of the two may be balanced.
  • the power increase value ⁇ is determined, and the power increase value is added based on the existing transmit power (for example, the second transmit power of the corresponding uplink access signal transmitted when the normal random access is performed). ⁇ , which is taken as the first transmission power.
  • the first transmit power when the UE determines the first transmit power of the uplink access message according to the power increase value, the first transmit power may be determined according to the following formula:
  • P H For the first transmit power, / ⁇ is the maximum transmit power of the UE, and is the second transmit power, which is the power increase value.
  • the smaller of the UE's maximum transmit power ⁇ and the second transmit power P RA and the power increase value ⁇ is taken as the first transmit power. In this way, the handover performance is improved under the premise of ensuring that the UE can successfully transmit.
  • the second transmit power when the uplink access message is a Preamble, according to the protocol, the second transmit power:
  • PRA P 0 _PRE + ⁇ PREAMBLE + 1) ⁇ 2 )
  • P 0 — PRE is the initial transmit power of the Preamble
  • ⁇ TM £ ⁇ ⁇ £ is the offset based on the Preamble format
  • is the downlink path loss estimate
  • N ⁇ is the value of the Preamble transmission counter, which is the power boost factor.
  • the second transmit power is increased, and the obtained result is compared with the maximum transmit power P CMAX allowed by the UE, and the smaller one is used as the first transmit power of the Preamble when the handover is performed.
  • the value of one or more parameters in the above equation (2) may also be adjusted to achieve an increase in the transmit power of the preamble.
  • the second transmit power when the uplink access message is Msg3, according to the protocol, the second transmit power
  • P RA P 0_PRE + A PREAMBLE _M Sg 3 + ⁇ ⁇ Og w (M ( )) + PL + ⁇ / 5 3 )
  • P 0 — PRE is the initial transmit power of the Preamble
  • ⁇ ⁇ M 3 is the Msg3 relative to the Preamble
  • the power offset, M p (i) is the bandwidth occupied by the PUSCH (Physical Uplink Shared Channel) in the subframe i, which is the downlink path loss estimation
  • the AP pup is the power boost amount corresponding to the number of Preamble transmissions. 2 is the TPC (Transmission Power Control) command.
  • is added to the second transmission power / ⁇ , and the obtained result is compared with the maximum transmission power P allowed by the UE, and the smaller one is used as the first transmission power of the transmission Msg3 at the time of handover.
  • the value of one or more parameters in the above equation (3) may also be adjusted to achieve an increase in sg3 transmission power ⁇ .
  • a new ⁇ vine ⁇ 3 + can be set instead of A ra£AMB £ M 3 in the above equation to obtain the first transmit power of the transmitted Msg3 at the time of switching. It should be understood that this adjustment also falls within the embodiment of the present invention. Within the scope of protection.
  • the UE when determining the power increase value of the uplink access message, may obtain a power increase value carried in the broadcast message of the target cell.
  • the UE when the UE prepares for handover, it receives a broadcast message sent by the target base station, and the broadcast message carries a power increase value. After receiving the broadcast message, the UE extracts a power increase value from the broadcast message.
  • the UE when determining the power increase value of the uplink access message, may obtain the power increase value carried in the handover command sent by the base station of the source cell.
  • the source base station After the target base station agrees to the handover, the source base station sends a handover command to the UE, and the power increase value may be carried in the handover command.
  • the target base station can be at the source base station
  • the transmitted handover acknowledgement message carries the power increase value, so that the source base station can carry the power increase value in the handover command.
  • the UE After receiving the handover command, the UE extracts a power increase value from the handover command.
  • the UE may obtain a pre-configured power increase value when determining a power increase value of the uplink access message.
  • the power increase value may be specified by a protocol, so that the UE does not need to interact with the network side to obtain a power increase value.
  • the source base station or the target base station may also notify the UE of the power increase value by other means, for example, the source base station may notify the power increase value through dedicated signaling.
  • the source base station may notify the power increase value through dedicated signaling.
  • the uplink access message is transmitted at a higher transmit power than that used when the normal random access is performed, thereby improving the switching performance.
  • FIG. 3 is a schematic block diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment 30 of FIG. 3 includes a determining unit 310 and a transmitting unit 320.
  • the determining unit 310 determines a first transmit power of the uplink access message transmitted during the process of switching from the source cell to the target cell, where the first transmit power is higher than the second transmit power of the corresponding uplink access message that is sent when the normal random access is performed. .
  • the normal random access refers to a simple random access in a general sense, for example, an initial random access initiated after the UE is powered on, or, for example, a random access initiated by the UE to restore the link after a link failure. Or, for example, the random access initiated by the UE when transitioning from the idle state to the connected state when there is uplink data to be transmitted, and so on.
  • Transmitting unit 320 transmits an uplink access message with a first transmit power.
  • the technical solution of the embodiment of the present invention can improve the handover performance when the UE is switched from the source cell to the target cell for random access, and the uplink access message is transmitted at a higher transmission power than that used when performing normal random access.
  • the foregoing uplink access message is a preamble message (Preamble) and/or a message three (Msg3).
  • Preamble preamble
  • Msg3 message three
  • the determining unit 310 may further determine a power increase value of the uplink access message, and determine a first transmit power of the uplink access message according to the power increase value.
  • the power increase value may be a preset value, for example, a value that can be set after comprehensively considering the interference size and the switching success rate. For example, when the UE is ready to perform cell handover, the power increase value is determined, and the power increase value ⁇ is added based on the existing transmit power (for example, the second transmit power of the corresponding uplink access signal transmitted when the normal random access is performed). , as the first transmit power.
  • the determining unit 310 may determine the first transmit power according to the following formula:
  • P H0 Min ⁇ P CMAX , P RA +B ⁇ ,
  • ⁇ ⁇ For the first transmit power, 4 is the maximum transmit power of the user equipment UE, which is the second transmit power, and ⁇ is the power increase value.
  • the smaller of the sum of the UE maximum transmit power and the second transmit power P RA and the power increase value is taken as the first transmit power P H . .
  • the handover performance is improved under the premise of ensuring that the UE can successfully transmit.
  • the determining unit 310 is specifically configured to acquire the power increase value carried in the broadcast message of the target cell.
  • the UE when the UE prepares for handover, it receives a broadcast message sent by the target base station, and the broadcast message carries a power increase value. After receiving the broadcast message, the UE extracts a power increase value from the broadcast message.
  • the determining unit 310 may obtain the power increase value carried in the handover command sent by the base station of the source cell.
  • the source base station After the target base station agrees to the handover, the source base station sends a handover command to the UE, and the power increase value may be carried in the handover command.
  • the target base station may carry the power increase value in the handover confirmation message sent to the source base station, so that the source base station can carry the power increase value in the handover command.
  • the UE After receiving the handover command, the UE extracts a power increase value from the handover command.
  • the determining unit 310 may obtain the pre-configured power increase value.
  • the power increase value may be specified by a protocol, so that the UE does not need to interact with the network side to obtain a power increase value.
  • FIG. 4 is a schematic block diagram of a user equipment according to another embodiment of the present invention.
  • User equipment of Figure 4 40 is a schematic block diagram of a user equipment according to another embodiment of the present invention.
  • the UE 40 can be applied to various communication systems.
  • the UE 40 includes a transmitting circuit 420, a receiving circuit 430, a processing unit 450, a memory 460, and an antenna 410.
  • Processing unit 450 controls the operation of UE 40 and is operable to process signals.
  • the processing unit 450 may also be referred to as a CPU (Central Processing Unit).
  • Memory 460 can include read only memory And random access memory, and provide instructions and data to processing unit 450.
  • a portion of the memory 460 may also include non-volatile line random access memory (NVRAM).
  • UE 40 may also include a carrier that houses transmit circuitry 420 and receive circuitry 430 to allow for data transmission and reception between device 40 and a remote location.
  • Transmit circuit 420 and receive circuit 430 can be coupled to antenna 410.
  • the various components of UE 40 are coupled together by a bus system 470, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 470 in the figure.
  • each step of the above method may be completed by an integrated logic circuit of hardware in the processing unit 450 or an instruction in the form of software.
  • the processing unit 450 determines a first transmit power of the uplink access message that is sent during the process of switching from the source cell to the target cell, where the first transmit power is higher than the second transmit power of the corresponding uplink access message that is sent when the normal random access is performed. .
  • Transmit circuit 420 transmits an uplink access message with a first transmit power.
  • the technical solution of the embodiment of the present invention can improve the handover performance when the UE is switched from the source cell to the target cell for random access, and the uplink access message is transmitted at a higher transmission power than that used when performing normal random access.
  • the foregoing uplink access message is a preamble message (Preamble) and/or a message three (Msg3).
  • Preamble preamble
  • Msg3 message three
  • the processing unit 450 may determine a power increase value of the uplink access message when determining the first transmit power of the uplink access message that is sent during the process of switching from the source cell to the target cell, and then The power increase value determines a first transmit power of the uplink access message.
  • the processing unit 450 may determine the first transmit power according to the following formula:
  • P H0 Min ⁇ P CMAX , P RA + ⁇ ,
  • the dish is the maximum transmit power of the UE, / ⁇ is the second transmit power, and ⁇ is the power increase value.
  • the processing unit 450 may obtain the power increase value carried in the broadcast message of the target cell.
  • the processing unit 450 may obtain the power increase value carried in the handover command sent by the base station of the source cell.
  • the processing unit 450 may obtain the pre-configured power increase value.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • 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, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separate, 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 objectives of the embodiments of the present invention.
  • 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 is implemented in the form of a software functional unit and sold as a separate product When sold or used, it can be stored on a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or 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 removable 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. .

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Abstract

本发明公开了一种切换方法和用户设备。该方法包括:确定从源小区切换至目标小区的过程中发射的上行接入消息的第一发射功率,第一发射功率高于进行普通随机接入时发射的对应上行接入消息的第二发射功率;以第一发射功率发射上行接入消息。本发明实施例的技术方案可以在 UE从源小区切换至目标小区进行随机接入时,以高于进行普通随机接入时使用的发射功率发射上行接入消息,进而提升了切换性能。

Description

切换方法和用户设备 技术领域
本发明涉及通信技术领域, 并且更具体地, 涉及一种切换方法和用户设 备。 背景技术
移动性管理分为空闲态管理和连接态管理。连接态下的一种重要操作是 切换操作。切换的基本目标是为移动的终端在系统范围内提供连续的无中断 的通信服务。 以 LTE ( Long Term Evolution, 长期演进) 系统为例, 切换基 本流程如下: 源小区 eNB ( Evolutional Node B, 演进型基站 )根据 UE ( User Equipment,用户设备)上报的测量报告,决定该 UE是否需要进行小区切换; 当源小区 eNB确定 UE需要进行小区切换时, 向目标小区 eNB发送切换请 求消息; 当目标小区 eNB同意该次切换时, 向源小区 eNB发送切换确认消 息; 源小区 eNB收到切换确认消息后, 向 UE发送切换命令; UE随即启动 随机接入过程; UE成功接入目标小区 eNB后, 向目标小区 eNB发送切换成 功消息; 最后, 在 UE完成 MME ( Mobility Management Entity , 移动性管理 实体)相关转移过程后,源小区 eNB释放该 UE的相关资源,切换过程结束。 其他系统下的切换过程也是类似的。
在上述 UE随机接入至目标小区的过程中, 现有的技术方案没有考虑到 切换时空口性能的特殊性, 采用了与普通的随机接入方式相同的功率发送机 制, 从而导致切换性能出现瓶颈, 需要改进。 发明内容
本发明实施例提供了一种切换方法和用户设备, 能够提升切换性能。 第一方面, 本发明实施例提供了一种切换方法, 该方法包括: 确定从源 小区切换至目标小区的过程中发射的上行接入消息的第一发射功率, 第一发 射功率高于进行普通随机接入时发射的对应上行接入消息的第二发射功率; 以第一发射功率发射上行接入消息。
结合第一方面, 在第一方面的第一种实现方式中, 确定从源小区切换至 目标小区的过程中发射的上行接入消息的第一发射功率, 包括: 确定上行接 入消息的功率增加值; 根据功率增加值确定上行接入消息的第一发射功率。 结合第一方面及其上述实现方式, 在第一方面的第二种实现方式中, 根 据功率增加值确定上行接入消息的第一发射功率, 包括: 根据以下公式确定 第一发射功率,
PH0 = Min{PCMAX , PRA +B} ,
其中, ^。为第一发射功率, ^。^为用户设备的最大发射功率, PSA为第 二发射功率, 为功率增加值。
结合第一方面及其上述实现方式, 在第一方面的第三种实现方式中, 确 定上行接入消息的功率增加值, 包括: 获取目标小区的广播消息中携带的功 率增加值; 或者, 获取源小区的基站发送的切换命令中携带的功率增加值; 或者, 获取预配置的所述功率增加值。
结合第一方面及其上述实现方式, 在第一方面的第四种实现方式中, 上 行接入消息为前导消息和 /或消息三。
第二方面,本发明实施例提供了一种用户设备,该设备包括:确定单元, 用于确定从源小区切换至目标小区的过程中发射的上行接入消息的第一发 射功率, 第一发射功率高于进行普通随机接入时发射的对应上行接入消息的 第二发射功率; 发射单元, 用于以第一发射功率发射上行接入消息。
结合第二方面, 在第二方面的第一种实现方式中, 确定单元还用于, 确 定上行接入消息的功率增加值, 并根据功率增加值确定上行接入消息的第一 发射功率。
结合第二方面及其上述实现方式,在第二方面的第二种实现方式中确定 单元具体用于, 根据以下公式确定第一发射功率,
PH0 = Min{PCMAX , PRA +B} ,
其中, ΡΗ。为第一发射功率, /^^为用户设备的最大发射功率, PSA为第 二发射功率, 为功率增加值。
结合第二方面及其上述实现方式, 在第二方面的第三种实现方式中, 确 定单元具体用于, 获取目标小区的广播消息中携带的功率增加值; 或者, 获 取源小区的基站发送的切换命令中携带的功率增加值; 或者, 获取预配置的 功率增加值。
结合第二方面及其上述实现方式, 在第二方面的第四种实现方式中, 上 行接入消息为前导消息和 /或消息三。 基于上述技术方案, 本发明实施例可以在 UE从源小区切换至目标小区 进行随机接入时, 以高于进行普通随机接入时使用的发射功率发射上行接入 消息, 进而提升了切换性能。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对本发明实施例中 所需要使用的附图作筒单地介绍, 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是本发明实施例的切换方法和用户设备可应用的通信系统的示意性 结构图。
图 2是本发明一个实施例的切换方法的示意性流程图。
图 3是本发明一个实施例的用户设备的示意性框图。
图 4是本发明另一实施例的用户设备的示意性框图。 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的一部分实施例, 而不 是全部实施例。 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 造性劳动的前提下所获得的所有其他实施例, 都应属于本发明保护的范围。
应理解, 本发明实施例的技术方案可以应用于各种通信系统, 例如: 全 球移动通讯 ( Global System of Mobile communication, 筒称为 "GSM" )系统、 码分多址(Code Division Multiple Access, 筒称为 "CDMA" ) 系统、 宽带码 分多址( Wideband Code Division Multiple Access, 筒称为 "WCDMA" )系统、 通用分组无线业务(General Packet Radio Service, 筒称为 "GPRS" )、 长期 演进(Long Term Evolution, 筒称为 "LTE" )系统、 LTE频分双工( Frequency Division Duplex,筒称为 "FDD" )系统、 LTE 时分双工( Time Division Duplex, 筒称为 "TDD" )、 通用移动通信系统 ( Universal Mobile Telecommunication System,筒称为 "UMTS" ),全球互联微波接入( Worldwide Interoperability for Microwave Access , 筒称为 " WiMAX" )通信系统等。
还应理解,在本发明实施例中,用户设备( User Equipment,筒称为 "UE" ) 可称之为终端 (Terminal ), 移动台 (Mobile Station, 筒称为 "MS" )、 移动 终端 (Mobile Terminal )等, 该用户设备可以经无线接入网 (Radio Access Network, 筒称为 "RAN" )与一个或多个核心网进行通信, 例如, 用户设备 可以是移动电话(或称为 "蜂窝" 电话)、 具有移动终端的计算机等, 例如, 用户设备还可以是便携式、 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音和 /或数据。
在本发明实施例中, 基站可以是 GSM 或 CDMA 中的基站 (Base Transceiver Station, 筒称为 "BTS" ), 也可以是 WCDMA中的基站( NodeB, 筒称为 "NB" ), 还可以是 LTE中的演进型基站(Evolutional Node B, 筒称 为 "ENB或 e-NodeB" ), 本发明并不限定。 但为描述方便, 下述实施例将以 基站 ENB和用户设备 UE为例进行说明。
图 1是本发明实施例的切换方法和用户设备可应用的通信系统的示意性 结构图。 图 1的通信系统包括控制源小区 101a的源基站 110a, 控制目标小 区 101b的目标基站 110b和 UE 120, 但本发明对通信系统中源基站 110a、 目标基站 110b和 UE 120数量不作限定。
源小区是 UE 120的当前服务小区。在连接态下,源基站 110a和 UE 120 之间建立了通信链路, 并且正使用该通信链路进行通话和 /或数据传输。
源基站 110a在根据接收到 UE 120上报的测量报告确定 UE 120需要从 源小区切换至目标小区且目标基站 110b同意 UE 120进行切换时,向 UE 120 发送切换命令。 UE 120接收到该切换命令后启动随机接入过程, 准备从源 小区切换接入至目标小区, 即准备向目标小区的目标基站 110b发送上行接 入消息。
需要进行切换的场景, 一般是 UE位于两个小区 101a和 101b的边缘。 虽然两个小区 101a和 101b均可以覆盖到 UE 120, 但是 UE 120距离两个小 区的基站的距离一般较远。尤其是, UE 120距离目标基站 110b的距离较远, 因此 UE 120和目标基站 110b之间的空口性能相对较差。如果不考虑小区切 换时对空口性能要求的这种特殊性, UE仍然按照普通的随机接入方式来接 入至目标基站, 这样可能会导致本次接入失败, 进而影响了切换性能。
图 2是本发明一个实施例的切换方法的示意性流程图。 图 2的方法可以 由 UE执行, 例如, 图 1所示的 UE 120。
210, 确定从源小区切换至目标小区的过程中发射的上行接入消息的第 一发射功率, 第一发射功率高于进行普通随机接入时发射的对应上行接入消 息的第二发射功率。
应理解, 普通随机接入是指一般意义上的单纯的随机接入, 例如, UE, 在 RRC_IDLE (空闲)态下进行的初始接入, 或者在无线链路故障或失步后 进行的重新接入, 或者在 RRC_CONNECTED (连接) 态下因某些特殊原因 需要发起的随机接入, 等等。
220, 以第一发射功率发射上行接入消息。
本发明实施例可以在 UE从源小区切换至目标小区进行随机接入时, 以 高于进行普通随机接入时使用的发射功率发射上行接入消息, 进而提升了切 换性能。
可选地, 作为一个实施例, 上述上行接入消息为前导消息 (Preamble ) 和 /或消息三 (Msg3 )。
可选地, 作为一个实施例, 在步骤 210中, 在确定从源小区切换至目标 小区的过程中发射的上行接入消息的第一发射功率时, 可确定上行接入消息 的功率增加值, 然后根据功率增加值确定上行接入消息的第一发射功率。
功率增加值可以为预设值,例如,可以综合考虑干扰大小和切换成功率, 平衡这两者的需求之后设置的数值。
例如, 在 UE准备进行小区切换时, 确定功率增加值 β , 在现有的发射 功率(例如,进行普通随机接入时发射的对应上行接入信号的第二发射功率) 基础上增加功率增加值 β , 将其作为第一发射功率。
可选地, 作为另一实施例, 在 UE根据功率增加值确定上行接入消息的 第一发射功率时, 可以根据以下公式确定第一发射功率:
PH0 = Min{PCMAX , PRA + } ( 1 )
其中, PH。为第一发射功率, /^^为 UE的最大发射功率, 为第二发 射功率, 为功率增加值。
如上述公式所示,取 UE最大发射功率 ΜΑΧ和第二发射功率 PRA与功率增 加值 β之和中较小的作为第一发射功率。 这样, 在保证 UE能够成功发射的 前提下, 提升了切换性能。
举例来说, 当上行接入消息为 Preamble时, 根据协议规定, 第二发射功 率:
PRA = P0_PRE + ^PREAMBLE + 1) · 2 ) 其中, P0PRE为 Preamble初始发射功率, Δ™£ΑΛ^£为基于 Preamble格式 的偏移量, ^为下行路损估计, N ^为 Preamble传输计数器数值, 为功 率抬升因子。
此时, 在第二发射功率/^上增加 , 所得的结果与 UE允许的最大发射 功率 PCMAX进行比较, 取较小者作为切换时发射 Preamble的第一发射功率。
可替换地, 也可以调整上式(2 ) 中的一个或多个参数的取值, 以实现 前导消息发射功率增加 。 例如, 可设置新的 A AMB £ = APS£AAffl £ + JB取代上式 中的 ^得到切换时发射前导消息的第一发射功率。 应理解, 这种调整 方式也落入本发明实施例的保护范围内。
作为另一个例子, 当上行接入消息为 Msg3时, 根据协议规定, 第二发 射功率
PRA = P0_PRE + A PREAMBLE _MSg3 + ^ \Ogw (M ( )) + PL + Δ/5 3 ) 其中, P0PRE为 Preamble 初始发射功率, ΔΡ M 3为 Msg3 相对 Preamble的功率偏置, Mp (i)为在子帧 i中 PUSCH ( Physical Uplink Shared Channel, 物理上行共享信道) 所占的带宽, 为下行路损估计, AP pup为 Preamble 发送次数对应的功率抬升量, 2为 TPC ( Transmission Power Control, 发射功率控制)命令。
此时, 在第二发射功率/^上增加 β , 所得的结果与 UE允许的最大发射 功率 P 进行比较, 取较小者作为切换时发射 Msg3的第一发射功率。
可替换地, 也可以调整上式(3 ) 中的一个或多个参数的取值, 以实现 sg3 发射功率增加 β。 例如, 可设置新的 = Δ„ Μ 3 + 取代 上式中的 Ara£AMB £ M 3得到切换时发射 Msg3的第一发射功率。 应理解, 这种 调整方式也落入本发明实施例的保护范围内。
可选地, 作为另一实施例, UE在确定上行接入消息的功率增加值时, 可获取目标小区的广播消息中携带的功率增加值。
例如, 在 UE准备切换时, 接收目标基站发送的广播消息, 该广播消息 携带功率增加值。 UE接收到广播消息后, 从该广播消息中提取功率增加值。
可选地, 作为另一实施例, UE在确定上行接入消息的功率增加值时, 可获取源小区的基站发送的切换命令中携带的功率增加值。
源基站在目标基站同意切换之后, 会向 UE发送切换命令, 此时可在切 换命令中携带上述功率增加值。 另外, 在此之前, 目标基站可以在向源基站 发送的切换确认消息中携带该功率增加值, 以便源基站能够在切换命令中携 带功率增加值。 UE接收到切换命令后, 从该切换命令中提取功率增加值。
可选地, 作为另一实施例, UE在确定上行接入消息的功率增加值时, 可获取预配置的功率增加值。
例如, 可通过协议规定上述功率增加值, 这样无需 UE与网络侧进行交 互以获取功率增加值。
可替换地, 源基站或目标基站也可以通过其他方式向 UE通知功率增加 值, 例如源基站可通过专用信令来通知功率增加值。 这样的变化也落入本发 明实施例的范围内。
本发明实施例可以在 UE从源小区切换至目标小区进行随机接入时, 以 高于进行普通随机接入时使用的发射功率发射上行接入消息, 进而提升了切 换性能。
图 3是本发明一个实施例的用户设备的示意性框图。图 3的用户设备 30 包括确定单元 310和发射单元 320。
确定单元 310确定从源小区切换至目标小区的过程中发射的上行接入消 息的第一发射功率, 第一发射功率高于进行普通随机接入时发射的对应上行 接入消息的第二发射功率。
应理解, 普通随机接入是指一般意义上的单纯的随机接入, 例如, UE 开机后发起的初始随机接入, 或者例如, UE在链路故障之后为了恢复链路 而发起的随机接入, 或者例如, UE在有上行数据需要传输时从空闲态转至 连接态时发起的随机接入, 等等。
发射单元 320以第一发射功率发射上行接入消息。
本发明实施例的技术方案可以在 UE从源小区切换至目标小区进行随机 接入时, 以高于进行普通随机接入时使用的发射功率发射上行接入消息, 进 而提升了切换性能。
可选地, 作为一个实施例, 上述上行接入消息为前导消息 (Preamble ) 和 /或消息三 (Msg3 )。
可选地, 作为一个实施例, 确定单元 310还可以确定上行接入消息的功 率增加值, 并根据功率增加值确定上行接入消息的第一发射功率。
功率增加值可以为预设值, 例如, 可以在综合考虑了干扰大小和切换成 功率之后设置的数值。 例如, 在 UE准备进行小区切换时, 确定功率增加值 , 在现有的发射 功率(例如,进行普通随机接入时发射的对应上行接入信号的第二发射功率) 基础上增加功率增加值 β , 将其作为第一发射功率。
可选地, 作为另一实施例, 确定单元 310可根据以下公式确定第一发射 功率:
PH0 = Min{PCMAX , PRA +B} ,
其中, ΡΗ。为第一发射功率, 4皿为用户设备 UE的最大发射功率, 为 第二发射功率, ^为功率增加值。
如上述公式所示,取 UE最大发射功率 和第二发射功率 PRA与功率增 加值 之和中较小者作为第一发射功率 PH。。 这样, 在保证 UE能够成功发射 的前提下, 提升了切换性能。
可选地, 作为另一实施例, 确定单元 310具体用于, 获取所述目标小区 的广播消息中携带的所述功率增加值。
例如, 在 UE准备切换时, 接收目标基站发送的广播消息, 该广播消息 携带功率增加值。 UE接收到广播消息后, 从该广播消息中提取功率增加值。
可选地, 作为另一实施例, 确定单元 310可获取所述源小区的基站发送 的切换命令中携带的所述功率增加值。
源基站在目标基站同意切换之后, 会向 UE发送切换命令, 此时可在切 换命令中携带上述功率增加值。 另外, 在此之前, 目标基站可以在向源基站 发送的切换确认消息中携带该功率增加值, 以便源基站能够在切换命令中携 带功率增加值。 UE接收到切换命令后, 从该切换命令中提取功率增加值。
可选地, 作为另一实施例, 确定单元 310可获取预配置的所述功率增加 值。
例如, 可通过协议规定上述功率增加值, 这样无需 UE与网络侧进行交 互以获取功率增加值。
图 4是本发明另一实施例的用户设备的示意性框图。图 4的用户设备 40
UE 40可应用于各种通信系统中。 图 4的实施例中, UE 40包括发射电 路 420、接收电路 430、处理单元 450,存储器 460及天线 410。处理单元 450 控制 UE 40的操作, 并且可用于处理信号。 处理单元 450还可以称为 CPU ( Central Processing Unit, 中央处理单元)。 存储器 460可以包括只读存储器 和随机存取存储器, 并向处理单元 450提供指令和数据。 存储器 460的一部 分还可以包括非易失行随机存取存储器(NVRAM )。 具体的应用中, UE 40 还可以包括容纳发射电路 420和接收电路 430的载体, 以允许装置 40和远 程位置之间进行数据发射和接收。发射电路 420和接收电路 430可以耦合到 天线 410。 UE 40的各个组件通过总线系统 470耦合在一起, 其中总线系统 470除包括数据总线之外, 还包括电源总线、 控制总线和状态信号总线。 但 是为了清楚说明起见, 在图中将各种总线都标为总线系统 470。
上述本发明实施例揭示的方法可以应用于处理单元 450中,或者由处理 单元 450实现。 在实现过程中, 上述方法的各步骤可以通过处理单元 450中 的硬件的集成逻辑电路或者软件形式的指令完成。
处理单元 450确定从源小区切换至目标小区的过程中发射的上行接入消 息的第一发射功率, 第一发射功率高于进行普通随机接入时发射的对应上行 接入消息的第二发射功率。
发射电路 420以第一发射功率发射上行接入消息。
本发明实施例的技术方案可以在 UE从源小区切换至目标小区进行随机 接入时, 以高于进行普通随机接入时使用的发射功率发射上行接入消息, 进 而提升了切换性能。
可选地, 作为一个实施例, 上述上行接入消息为前导消息 (Preamble ) 和 /或消息三 (Msg3 )。
可选地, 作为一个实施例, 处理单元 450可以在确定从源小区切换至目 标小区的过程中发射的上行接入消息的第一发射功率时,确定上行接入消息 的功率增加值, 然后根据功率增加值确定上行接入消息的第一发射功率。
可选地, 作为另一实施例, 处理单元 450可以根据以下公式确定第一发 射功率:
PH0 = Min{PCMAX , PRA + } ,
其中, PH。为第一发射功率, 皿为 UE的最大发射功率, /^为第二发 射功率, β为功率增加值。
可选地, 作为另一实施例, 处理单元 450可以获取所述目标小区的广播 消息中携带的所述功率增加值。
可选地, 作为另一实施例, 处理单元 450可以获取所述源小区的基站发 送的切换命令中携带的所述功率增加值。 可选地, 作为另一实施例, 处理单元 450可以获取预配置的所述功率增 加值。
应理解, 在本发明的各种实施例中, 上述各过程的序号的大小并不意味 着执行顺序的先后, 各过程的执行顺序应以其功能和内在逻辑确定, 而不应 对本发明实施例的实施过程构成任何限定。
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、 计算机软件或者二者的结合来实 现, 为了清楚地说明硬件和软件的可互换性, 在上述说明中已经按照功能一 般性地描述了各示例的组成及步骤。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, 为了描述的方便和筒洁, 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。 另外, 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, 也可以是电的, 机械的或其它的形式连接。
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发明实施例方案的目的。
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, 也可以是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采用硬件的形式实现, 也可以采用软件 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 想到各种等效的修改或替换, 这些修改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以权利要求的保护范围为准。

Claims

权利要求
1、 一种切换方法, 其特征在于, 包括:
确定从源小区切换至目标小区的过程中发射的上行接入消息的第一发 射功率,所述第一发射功率高于进行普通随机接入时发射的对应上行接入消 息的第二发射功率;
以所述第一发射功率发射所述上行接入消息。
2、 根据权利要求 1所述的方法, 其特征在于, 所述确定从源小区切换 至目标小区的过程中发射的上行接入消息的第一发射功率, 包括:
确定所述上行接入消息的功率增加值;
根据所述功率增加值确定所述上行接入消息的第一发射功率。
3、 根据权利要求 2所述的方法, 所述根据所述功率增加值确定所述上 行接入消息的第一发射功率, 包括:
根据以下公式确定所述第一发射功率,
PH0 = Min{PCMAX , PRA +B} ,
其中, PH。为所述第一发射功率, 皿为用户设备的最大发射功率, PRA 为所述第二发射功率, 为所述功率增加值。
4、 根据权利要求 2或 3所述的方法, 其特征在于, 所述确定所述上行 接入消息的功率增加值, 包括:
获取所述目标小区的广播消息中携带的所述功率增加值; 或者, 获取所述源小区的基站发送的切换命令中携带的所述功率增加值; 或 者,
获取预配置的所述功率增加值。
5、 根据权利要求 1至 4任一项所述的方法, 其特征在于, 所述上行接 入消息为前导消息和 /或消息三。
6、 一种用户设备, 其特征在于, 包括:
确定单元, 用于确定从源小区切换至目标小区的过程中发射的上行接入 消息的第一发射功率,所述第一发射功率高于进行普通随机接入时发射的对 应上行接入消息的第二发射功率;
发射单元, 用于以所述第一发射功率发射所述上行接入消息。
7、 根据权利要求 6所述的用户设备, 其特征在于,
所述确定单元还用于, 确定所述上行接入消息的功率增加值, 并根据所 述功率增加值确定所述上行接入消息的第一发射功率。
8、 根据权利要求 7所述的用户设备, 其特征在于, 所述确定单元具体 用于, 根据以下公式确定所述第一发射功率,
PH0 = Min{PCMAX , PRA +B} ,
其中, PH。为所述第一发射功率, 皿为用户设备的最大发射功率, PRA 为所述第二发射功率, β为所述功率增加值。
9、 根据权利要求 7或 8所述的用户设备, 其特征在于, 所述确定单元 具体用于,
获取所述目标小区的广播消息中携带的所述功率增加值; 或者, 获取所述源小区的基站发送的切换命令中携带的所述功率增加值; 或 者,
获取预配置的所述功率增加值。
10、 根据权利要求 6至 9任一项所述的用户设备, 其特征在于, 所述上 行接入消息为前导消息和 /或消息三。
PCT/CN2013/080428 2013-07-30 2013-07-30 切换方法和用户设备 WO2015013888A1 (zh)

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CN1731886A (zh) * 2004-08-05 2006-02-08 华为技术有限公司 一种确定移动台切换后初始接入功率的方法
WO2008143564A1 (en) * 2007-05-23 2008-11-27 Telefonaktiebolaget Lm Ericsson (Publ) A method and a network node for controlling output uplink and downlink power levels in a mobile communications system
CN102984793A (zh) * 2012-11-28 2013-03-20 大唐移动通信设备有限公司 前导期望接收功率配置方法、装置及基站

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Publication number Priority date Publication date Assignee Title
CN1731886A (zh) * 2004-08-05 2006-02-08 华为技术有限公司 一种确定移动台切换后初始接入功率的方法
WO2008143564A1 (en) * 2007-05-23 2008-11-27 Telefonaktiebolaget Lm Ericsson (Publ) A method and a network node for controlling output uplink and downlink power levels in a mobile communications system
CN102984793A (zh) * 2012-11-28 2013-03-20 大唐移动通信设备有限公司 前导期望接收功率配置方法、装置及基站

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