WO2011103722A1 - 通信系统中跨小区切换的方法和装置 - Google Patents

通信系统中跨小区切换的方法和装置 Download PDF

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Publication number
WO2011103722A1
WO2011103722A1 PCT/CN2010/070779 CN2010070779W WO2011103722A1 WO 2011103722 A1 WO2011103722 A1 WO 2011103722A1 CN 2010070779 W CN2010070779 W CN 2010070779W WO 2011103722 A1 WO2011103722 A1 WO 2011103722A1
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Prior art keywords
serving cell
handover
cell
target
target serving
Prior art date
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PCT/CN2010/070779
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English (en)
French (fr)
Inventor
郭霁明
范明熙
Original Assignee
高通股份有限公司
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 高通股份有限公司 filed Critical 高通股份有限公司
Priority to PCT/CN2010/070779 priority Critical patent/WO2011103722A1/zh
Priority to CN201080002117.3A priority patent/CN102239726B/zh
Priority to PCT/CN2010/076376 priority patent/WO2011103745A1/en
Priority to US13/575,288 priority patent/US20130201959A1/en
Priority to TW100101143A priority patent/TW201146039A/zh
Publication of WO2011103722A1 publication Critical patent/WO2011103722A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/18Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/18Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H04W36/185Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection using make before break
    • 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 communications; and more particularly to a method and apparatus for handoff in a communication system. Background technique
  • TD-SCDMA is a 3G communication standard promulgated by 3GPP and has been deployed and deployed by China Mobile since 2009.
  • the TD-SCDMA system performs multi-user access on the communication frequency band based on time division and code division.
  • the uplink and downlink transmissions are based on different time slots (TSes) of the same frequency band, and 16 code channels can be configured to support each time slot.
  • TSes time slots
  • Figure 1 shows an example of a frame structure of a TD-SCDMA system.
  • a downlink (DL) time slot TS0, three uplink time slots TS 1 to TS3, and downlink time slots TS4 to TS6 are arranged.
  • the system is also configured with downlink pilot and uplink pilot time slots (DwPTS/UpPTS), and a guard interval is also configured.
  • DwPTS/UpPTS downlink pilot and uplink pilot time slots
  • a guard interval is also configured.
  • the terminal When the hard handover mechanism is used, the terminal (UE) will first disconnect the communication link with the original serving cell (Source Serving Cel l ) and then establish a communication link with the target serving cell (Target Serving Cel l ), only in the After the target serving cell establishes a reliable link, the reliable transmission of data/voice can be guaranteed.
  • the relay switching mechanism is an optimization of the hard handover mechanism. In this mechanism, the UE first performs SFN time difference measurement between the source and target serving cells, and performs pre-comparison with the target serving cell based on the measurement result. At the handover time point, the UE will first switch the uplink, so that the target serving cell performs signal monitoring, and then switches the downlink after a period of uplink handover.
  • the introduction of the relay switching mechanism is to overcome the problems of access channel load and service interruption in the hard handover mechanism, but the following limitations still exist:
  • Both the uplink and downlink are in open loop transmission mode during the handover phase. Open loop transmission brings problems such as uplink interference and packet loss due to changes in the wireless channel. • Due to the presence of the upstream associated signaling channel in HSPA transmission, the uplink and downlink must be switched at the same time, and the effective and reliable transmission of data cannot be guaranteed before the reliable link is established.
  • the basic process and service interruption time based on hard handover and relay handover are shown in Table 1 during voice and data transmission:
  • Table 1 Basic process and service interruption time of TDSCDMA system based on hard handover and relay handover
  • the present invention provides a method and apparatus for solving handover problems in current TD-SCDMA systems and the like, for reducing the time of open loop transmission and service interruption during handover.
  • a method for cross-cell handover in a communication system includes the steps of: determining other available dimension spaces for establishing a communication link with a target serving cell to be handed over; After the communication link with the cell to be switched is reliably established through the determined available other dimension space, the connection with the source serving cell is disconnected, and the target cell to be switched is switched.
  • the determining that other dimension spaces are available includes: receiving information and instructions of the specified other dimension space; wherein, if communication with the source serving cell reaches full load without vacant dimensional space, according to the The received information and instructions release part of the dimensional space into the other dimensional spaces available.
  • the method further includes: obtaining a list of available cells; monitoring and measuring cells in the list; reporting, according to the monitoring measurement, a list of alternate handover cells; receiving the selected target to be switched Information about the serving cell.
  • the dimension space includes at least one of the following dimension spaces or a combination thereof: a time domain dimension space, and a frequency domain dimension space.
  • the determining other available dimensional spaces includes: determining a used carrier; determining a used time slot or a set of time slots to establish reliable downlink communication with the target serving cell in the used carrier and time slot.
  • Link Get information about the communication link.
  • the information about acquiring the communication link includes TA and P0
  • the method includes: after switching to the target serving cell, if a handover to a new carrier is required, the new carrier communication link is based on the acquiring The TA and P0 set up their TA and P0.
  • a time slot different from the source serving cell is used to establish with the target serving cell DCH channel.
  • the RNC When performing HSPA channel switching, the RNC will restrict the source serving cell from transmitting data to the UE without using the slot resources allocated for the target serving cell.
  • the used carrier includes the same carrier or a different carrier that communicates with the source serving cell; the used time slot includes the same time slot or a different time slot that communicates with the source serving cell, where The used carrier is different from at least one of the used slot/time slot sets.
  • the method includes the steps of: receiving a measurement type and a cell list to be performed, performing measurement according to the received information, and feeding back the result of the measurement;
  • a handover complete message is transmitted and the DL/UL data link is handed over to the target serving cell.
  • the using the SB includes: when HSPA transmission, if the accompanying DPCH is not configured, using a control channel such as SB (Special Burst) on the E-DCH and listening to the DL HS-SCCH/E-AGCH to perform time with the target handover cell Peer and power/rate control.
  • SB Specific Burst
  • An apparatus for cross-cell handover in a communication system of the present invention includes means for implementing the above method. These modules can be made up of various electronic devices such as FPGAs, DSPs, CPUs, logic arrays, and discrete components.
  • Figure 1 shows the TD-SCDMA frame structure.
  • Fig. 2 is a view showing the principle of a slot-level TDM switching-before-before-switching mode in the first embodiment of the present invention.
  • Figure 3 shows the slot level TDM mode of Embodiment 1 of the present invention.
  • Fig. 4 is a view showing the principle of the sub-frame time division multiplexing "Make-Before-Break" switching mode of Embodiment 2 of the present invention.
  • Figure 5 shows a sub-frame time division multiplexing mode HSDPA timel ine of Embodiment 2 of the present invention.
  • Figure 6. shows the frequency division multiplexing mode of Embodiment 3 of the present invention.
  • the UE maintains/establishes a service link with the source/target serving cell
  • the UE switches the uplink/downlink to the target serving cell and disconnects the uplink/downlink with the source serving cell.
  • voice and data including HSPA
  • the essential problem is to find other dimension space and target serving cell while maintaining data/voice communication with the source target serving cell. Establish a reliable downlink.
  • the present invention is described as establishing a concurrent connection with a plurality of serving cells during handover. Referring to Fig. 2, there is shown a schematic diagram of the principle of a slot-level TDM (Make-Before-Break) switching method according to Embodiment 1 of the present invention.
  • the network needs to allocate a different time slot resource to the source serving cell for the UE on the same physical frame, and the UE will establish a chain with the target serving cell in different time slots. The way while maintaining voice/data transmission with the source serving cell.
  • the UE data transmission cannot communicate with the source serving cell in all time slots in one subframe.
  • R5 (HSPA) UEs this requires a dedicated implementation by the base station scheduler. If the UE data transmission uses all time slots in one subframe, the base station scheduler needs to perform scheduling to release two time slots to implement an uplink and downlink communication link with the target serving cell.
  • Step 1 In the handover phase, the network instructs the UE to establish a reliable downlink with the target serving cell using the same carrier as the source cell;
  • Step 2 After the UE switches to the target serving cell, the target serving cell assigns the UE to other carriers. Since the UE can adopt / reference TA and P0 on the original carrier, and the same SFN/D0FF setting is used between different carriers of the same cell, there is no loss of voice data in the process of overdosing.
  • Figure 3 shows the slot level TDM mode of Embodiment 1 of the present invention.
  • Make-Bef ore-Break switch process The basic flow of implementing a "make-before-break" switch with the source/target service cell based on the TDM method is given.
  • the RNC will first establish carrier transmission resources with the target serving cell and guarantee:
  • the target serving cell DCH channel will adopt a different time slot than the source serving cell
  • the RNC will restrict the source serving cell from transmitting data to the UE without using the slot resource allocated for the target serving cell. After the RNC completes the resource configuration between the NodeBs, a handover request command is sent to the UE.
  • the UE will exchange SB with the target serving cell on the allocated pre-reverse link resources to establish transmission power and peer control; at the same time, maintain original voice/data transmission with the source serving cell; at TD HSPA
  • the target serving cell also sends an empty HS-SCCH (with zero payload) to the UE to request the UE to report the CQI information in a specific HS-SICH to establish rate control, and the UE will maintain data transmission with the source serving cell.
  • the UE will send a handover complete message to the RNC, switch the uplink and downlink to the target serving cell and release the transmission resource of the source serving cell.
  • the basic process description of the handover in Figure 3 is: 1) During the data/voice call process of the UE, the RNC configures the measurement type and cell list to be performed by the UE, and the UE performs measurement according to the network configuration and triggers a measurement report on the network based on the always or event.
  • the RNC decides to trigger the UE handover and communicate with the source/target serving cell to establish a transmission path and notify the source serving cell UE to establish a channel resource required for the physical link in the target serving cell.
  • the RNC sends a handover command to the UE to trigger handover of the UE to the target serving cell.
  • the UE uses the physical channel allocated by the RNC.
  • SB (Special Burst) communicates with the target handover cell for time synchronization and power control; in HSPA transmission, if the accompanying DPCH is not configured, the UE can use the SB (Special Burst) defined on the E-DCH and listen to the DL HS-SCCH
  • the control channel such as /E-AGCH performs time synchronization and power/rate control with the target handover cell. During the link setup process, the UE still exchanges data from the source service cell.
  • Fig. 4 is a view showing the principle of the sub-frame time division multiplexing "Make-Before-Break" switching mode of Embodiment 2 of the present invention.
  • the signaling procedure is substantially the same as that of Embodiment 1 of the present invention, except that the RNC needs to transmit resources in the subframe and the allocation source/target serving cell.
  • the transmission switching with the source/target serving cell at the subframe level brings the following restrictions: a) Since the voice frame transmission requires 4 subframes, it is not suitable for voice switching;
  • HSPA data transmission Sub-frame taking needs to follow the following transmission schedule, which will result in a decrease in data throughput during the handover phase.
  • Fig. 5 shows a subframe-level time division multiplexing scheme HSDPA t imel ine of Embodiment 2 of the present invention.
  • the channel with the "X" flag is the HSPA channel that cannot be used due to the physical link establishment of the target serving cell. If a 1/4 subframe is used to establish a link with the target serving cell, then 3/4 of the subframe will not be available for HS-DSCH channel transmission at the source serving cell.
  • FIG. 6 is a schematic diagram showing the principle of "Make-before-break" switching in the frequency division multiplexing mode of Embodiment 3 of the present invention.
  • the UE Since different frequencies are used for transmission from the source/target serving cell, the UE needs to have multi-carrier transmission capability. In addition, due to frequency division multiplexing, the UE can establish a link with the destination serving cell based on different frequencies while maintaining data transmission with the source serving cell.
  • the specific signaling procedure is basically the same as that of Figure 3 except that the RNC needs to allocate/coordinate the source/target serving cell transmission resources at the carrier level.
  • UE transmission power may be limited based on the transmission path loss between the source cell and the destination cell and the expected received signal power of the source/destination cell.
  • the network may allocate uplink transmissions of the UE to the source and destination cells to different time slots based on parameters such as path loss reported in the UE measurement, so as to reduce the probability of limited transmission power.
  • a module can include a processor, an electronic device, a hardware device, an electronic component, a logic circuit, a memory, etc., or any combination of the above.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the various exemplary logical blocks, modules, and circuits described in connection with the disclosure of the present application can be implemented or executed in discrete hardware components or any combination thereof.
  • the general purpose processor may be a microprocessor, or the processor may be any conventional processor, controller, microcontroller, or state machine.
  • the processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such structure.
  • the steps or algorithms in conjunction with the methods described in this disclosure may be embodied directly in hardware, in a software module executed by a processor, or in a combination of both.
  • the software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can be an integral part of the processor.
  • the processor and storage medium can be located in the AS IC.
  • the ASIC can be located at the user terminal. Of course, the processor and the storage medium can also be located in the user terminal as separate components.
  • the functions described herein can be implemented in hardware, software, firmware, or a combination thereof.
  • the functions may be stored in or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.
  • Such computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage device, or can be used for carrying or storing instructions, by way of example and not limitation.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, wireless, and microwave
  • coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the definition of the medium.
  • a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disc, and a Blu-ray disc, wherein the disc typically magnetically replicates data, and the disc The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

Description

通信系统中跨小区切换的方法和装置 发明领域
本发明涉及通信领域; 尤其涉及通信系统中越区切换的方法和装置。 背景技术
移动通信系统中跨小区区切换通常会影响用户体验和传输效率。 在
CDMA及 WCDMA系统中, 通常采用软切换技术。 在一些其它的系统中, 希望 平稳的切换。
TD-SCDMA 是由 3GPP 发布的 3G通信标准并已从 2009年开始由中国移 动部署商用。 TD-SCDMA系统基于时分和码分方式在通讯频段上进行多用户 接入, 其上行和下行传输基于相同频段的不同时隙 (TSes ) , 在每个时隙 上可以配置 16个码道来支持多用户并发通信。 图 1给出了 TD-SCDMA 系统 帧结构示例, 图中配置了一个下行(DL ) 时隙 TS0, 三个上行时隙 TS 1〜TS3 以及下行时隙 TS4〜TS6。 在 TS0和 TS 1之间, 系统还配置了下行导频和上 行导频时隙 (DwPTS/UpPTS), 其间还配置了保护间隔。 与其他采用软切换的商用 CDMA系统 (如 cdma2000/W-CDMA ) 相比, 在 TD-SCDMA系统中对语音和数据传输(包括 HSPA) 目前只支持硬切换和接力 切换机制。
当使用硬切换机制时, 终端 (UE) 将首先断掉与原服务小区 (Source Serving Cel l ) 的通讯链路后再建立与目标服务小区 (Target Serving Cel l ) 的通讯链路, 只有在与目标服务小区建立可靠链路后, 才能保证数 据 /语音的可靠传输。 接力切换机制是对硬切换机制的一种优化, 在该机制 中, UE首先进行源和目标服务小区之间的 SFN时间差测量, 基于测量结果 与目标服务小区进行预同歩。 在切换时间点, UE将先切换上行链路,以便 目标服务小区进行信号监测, 在上行切换一段时期以后再切换下行链路。 接力切换机制的引入是为了克服硬切换机制中的接入信道负载和服务中断 等问题, 但是仍存在以下局限性:
• 在切换阶段, 上行和下行链路均处在开环发送模式。 开环发送会带 来上行干扰和由于无线信道的变化而丢包等问题。 • 由于 HSPA 传输中上行伴随信令信道的存在,上下行链路必须同时进 行切换, 在建立可靠链路之前不能保证数据的有效可靠传输。 在语音和数据传输时, 基于硬切换和接力切换的基本流程和业务中断 时间如表 1所示:
表 1 TDSCDMA系统基于硬切换和接力切换的基本流程和业务中断时间
Figure imgf000004_0001
本发明提供了一种方法和装置, 用于解决当前 TD-SCDMA 系统及类似 系统中的切换问题, 用于减少切换过程中开环发送和业务中断的时间。
发明概述
根据本发明, 一种通信系统中跨小区切换的方法, 所述方法包括歩骤: 确定可用的与待切换的目标服务小区建立通信链路的其它维空间; 在与所述待切换的小区的通信链路通过所述确定的可用的其它维空间 可靠建立后, 断开与源服务小区的连接, 切换到所述待切换的目标服务小 区。
可选地, 所述确定可用的其它维空间包括: 接收指定的其它维空间的 信息和指令; 其中, 如果与所述源服务小区的通信达到满负荷而没有空余 的维空间时, 根据所述接收的信息和指令释放部分维空间, 成为所述可用 的其它维空间。
优选地, 该方法还包括歩骤: 获取可用小区的列表; 监控测量所述列 表中的小区; 根据所述监控测量, 报告可备用的切换小区列表; 接收被选 定的所述待切换的目标服务小区的信息。
其中所述维空间包括下列维空间的至少一个或其组合: 时域维空间, 频域维空间。
可选地, 所述确定可用的其它维空间包括: 确定所用的载波; 确定所 用的时隙或时隙集, 以在所述所用的载波和时隙与所述目标服务小区建立 可靠的下行通信链路; 获取通信链路的信息。
优选地, 所述获取通信链路的信息包括 TA和 P0 , 所述方法包括: 切换 到所述目标服务小区后, 如果需要切换到新的载波, 所述新的载波通信链 路基于所述获取的 TA和 P0设立其采用的 TA和 P0。
其中, 在进行 DCH 信道切换时, 采用与所述源服务小区不同的时隙与 所述目标服务小区 DCH 信道建立。
在进行 HSPA 信道切换时, RNC将限制所述源服务小区向 UE传输数据 时不采用为目标服务小区分配的时隙资源。
其中, 所述所用的载波包括与所述源服务小区通信的相同的载波或不 同的载波; 所述所用的时隙包括与所述源服务小区通信的相同的时隙或不 同的时隙, 其中, 所述所用的载波和所用的时隙 /时隙集中至少一个不同。
根据本发明的一种通信系统中跨小区切换的方法, 所述方法包括歩骤: 接收需进行的测量类型和小区列表,根据接收的信息, 进行测量, 反馈 所述测量的结果;
接收基于所述测量的结果触发的切换指令, 利用分配的物理信道建立 与源服务小区和目标服务小区通信; 在所述分配的物理信道使用 SB (Special Burst)与所述目标切换小区 通信以进行时间同歩和功率控制, 同时, 维持与所述源服务小区的数据交 换;
在与所述目标服务小区的建立的链路达到预定标准时, 发送切换完成 消息并将 DL/UL数据链路切换到所述目标服务小区。
其中所述使用 SB包括: 在 HSPA传输时, 如果没有配置伴随 DPCH, 使 用 E-DCH 上的 SB (Special Burst) 和监听 DL HS- SCCH/E- AGCH等控制信道 与所述目标切换小区进行时间同歩和功率 /速率控制。
本发明的一种通信系统中跨小区切换的装置, 包括用于实现上述方法 的模块。 这些模块可以是由各种电子器件如: FPGA,DSP, CPU, 逻辑整列及 分立元件构成的。 本发明的一种计算机可读存储媒介, 其上存储有上述方法。 本发明通过向目标服务小区切换上 /下行链路之前建立可靠的下行链 路的方式, 减少了切换过程中开环发送和业务中断的时间。 附图简述
通过下面结合附图阐述的详细说明, 本发明的特点、 目的和优点将变 得更清楚。
图 1示出 TD-SCDMA 帧结构。
图 2示出本发明的实施例 1的时隙级时分服用 (Slot-level TDM) 先 连后断 (Make-Before-Break) 切换方式的原理示意图。
图 3. 示出本发明的实施例 1的时隙级 TDM 方式下
Make-Before-Break切换流程。
图 4. 示出本发明的实施例 2的子帧级时分复用" Make-Before-Break" 切换方式的原理示意图。
图 5. 示出本发明的实施例 2的子帧级时分复用方式 HSDPA timel ine。 图 6. 示出本发明的实施例 3的频分复用方式下
"Make-bef ore-break" 切换的原理示意图 发明详述 通过下面的实施例的描绘, 本领域技术人员将会更好地理解本发明, 并根据这些实施例的精神实现本发明及本发明的等同方式。
在本发明中,为了减少切换过程中开环发送和业务中断的时间,并且在 向目标服务小区切换上 /下行链路之前建立可靠的下行链路,基于以下优化 方式实现 " make-bef ore-break " 类型的接力切换:
1) 在切换时, UE 维持 /建立与源 /目标服务小区的服务链路;
2) 在目标服务小区功控、 时间同歩以及传输速率控制完成之后, UE 向目标服务小区切换上 /下行链路并断开与源服务小区的上 /下行链路。 在具体描述中,通过描绘这些原则在 TD-SCDMA系统中语音和数据(包 括 HSPA ) 切换的具体实现, 使本领域技术人员理解并实施本发明。
为了在 TD-SCDMA系统及类似系统中达到 "make-before-break " 的切 换效果,本质性问题就是在与源目标服务小区保持数据 /语音通信的同时找 到其他维 (dimension ) 空间与目标服务小区建立可靠的下行链路。 通过描 绘三个实施例, 说明本发明的在切换过程中与多个服务小区建立并发的连 接。 参照图 2,示出本发明的实施例 1的时隙级时分服用(Slot-level TDM) 先连后断 (Make-Before-Break ) 切换方式的原理示意图。 当 UE 在时隙 级与目标服务小区建立链路时, 网络需要为 UE在相同的物理帧上分配与源 服务小区不同的时隙资源, UE 将在不同的时隙上与目标服务小区建立链路 同时保持与源服务小区的语音 /数据传输。
在源 /目标服务小区之间采用不同的时隙进行上下行传输对于传输资 源分配具有以下限制:
a) 在切换过程中, UE 数据传输在一个子帧内不能采用全部时隙与源 服务小区通信。对于 R5 (HSPA) UE来说, 这需要基站调度器进行专门实现。 如果 UE 数据传输在一个子帧内采用了全部时隙, 基站调度器需要进行调 度, 以释放 2个时隙实现与目标服务小区的上下行通信链路。
b) UE与源 /目标服务小区的连接必须采用相同的载波。 (不同载波之间 的 RF切换需要大约 300us , 这使在时隙级上在不同载波之间切换非常困 难)。 为了实现跨频率间的语音接力切换, 可以考虑引入以下扩展: 歩骤 1 : 在切换阶段, 网络指示 UE采用与源小区相同的载波与目标服 务小区建立可靠的下行链路;
歩骤 2 : 在 UE切换到目标服务小区之后, 目标服务小区将 UE 指配到 其他载波。 由于 UE可以采用 /参考原载波上的 TA和 P0, 而且相同小区不 同载波之间采用相同的 SFN/D0FF设置,在重支配过程中不会有语音数据的 丢失。 图 3. 示出本发明的实施例 1的时隙级 TDM 方式下
Make-Bef ore-Break切换流程。 给出了与源 /目标服务小区基于 TDM方式实 现 " make-before-break "切换的基本流程。 在初始切换阶段, RNC 将首先 与目标服务小区建立载波传输资源, 并保证:
1)如果 UE 进行 DCH 信道切换, 目标服务小区 DCH 信道将采用与源服 务小区不同的时隙;
2)如果 UE 同时进行 HSPA 信道切换, RNC将限制源服务小区向 UE传 输数据时不采用为目标服务小区分配的时隙资源。 在 RNC完成了 NodeB 之间的资源配置之后,将向 UE发送切换请求命令。 在切换激活时间点, UE将与目标服务小区在分配的前反向链路资源上交换 SB以建立发射功率和同歩控制; 同时与源服务小区保持原有的语音 /数据 传输;在 TD HSPA切换中,目标服务小区也同时向 UE发送空 HS-SCCH (with zero payload) 来请求 UE在特定的 HS-SICH 新到上报 CQI 信息来建立速 率控制, 同时, UE将与源服务小区保持数据传输来降低业务中断时间。 当 UE监测到与目标服务小区的链路可靠以后, UE将向 RNC 发送切换完成消 息, 将上下行链路切换到目标服务小区并释放源服务小区的传输资源。
图 3中切换的基本流程描述是: 1 ) 在 UE进行数据 /语音呼叫过程中, RNC配置 UE 需进行的测量类 型和小区列表, UE根据网络配置进行测量并基于始终或事件触发对网络的 测量报告。
2 ) 基于 UE的测量报告, RNC决定触发 UE切换并与源 /目标服务小区 通讯, 以建立传输路径并通知源服务小区 UE将在目标服务小区建立物理链 路所需信道资源。
3 ) RNC 向 UE发送切换命令触发 UE向目标服务小区的切换。
4) 在切换激活时间点, UE 使用 RNC 分配的物理信道使用
SB (Special Burst)与目标切换小区通信以进行时间同歩和功率控制; 在 HSPA传输时, 如果没有配置伴随 DPCH, UE 可以使用 E-DCH 上定义的 SB (Special Burst) 和监听 DL HS-SCCH/E-AGCH等控制信道与目标切换小 区进行时间同歩和功率 /速率控制。 在链路建立过程中, UE仍从源服务小 区进行数据交换。
5 ) 当与目标服务小区的链路建立完成 (达到可靠链路的标准) 后, UE向 RNC发送切换完成消息并将 DL/UL数据链路切换到目标服务小区。 图 4. 示出本发明的实施例 2的子帧级时分复用" Make-Before-Break" 切换方式的原理示意图。 当 UE 在子帧级与目标服务小区建立链路时, 网 络需要为 UE在相同 /不同的载波上分配与源服务小区不同的子帧, UE 将在 不同的子帧上与目标服务小区建立链路同时保持与源服务小区的语音 /数 据传输。
信令流程除了 RNC需要在子帧及分配源 /目标服务小区传输资源之 外, 与图 3示出本发明的实施例 1基本相同。 但是, 在子帧级进行与源 / 目标服务小区的传输切换会带来以下限制: a)由于语音帧传输需要 4个子帧, 不适用于语音切换;
b) HSPA数据传输: 子帧级服用需要遵循以下传输时间安排,会造成 在切换阶段数据吞吐量的下降。 图 5. 示出本发明的实施例 2的子帧级时分复用方式 HSDPA t imel ine。 给出了在源 /目标服务小区进行 HSPA数据传输和物理链路建立时的传输时 序关系图, 具体的, 具有 " X" 标记的信道是由于目标服务小区物理链路 建立而不能使用的 HSPA信道。 如果采用 1/4 的子帧与目标服务小区建立 链路, 那么 3/4的子帧将不能用于在源服务小区的 HS-DSCH信道传输。 即 使引入固定速率传输方式, HS-SCCH/ DSCH 的解码也需要两个连续的子帧, 这意味着只有 1/3的资源可以用来数据传输。 图 6. 示出本发明的实施例 3的频分复用方式下" Make-before-break" 切换的原理示意图。 当 UE 在频率级与目标服务小区建立链路时, 网络需 要为 UE与源服务小区不同的载波, UE 将在不同的载波上与目标服务小区 建立链路同时保持与源服务小区的语音 /数据传输。
由于与源 /目标服务小区传输采用不同的频率, UE 需要具有多载波传 输能力。 此外,由于频分复用, UE可以基于不同的频率与目的服务小区建 立链路同时保持与源服务小区的数据传输。 具体信令流程除了 RNC需要在 载波级分配 /协调 源 /目标服务小区传输资源之外, 与图 3基本相同。 当 UE在多个载波上同时发射时, 基于在与源小区和目的小区的传输路 损 (Pathloss )和 源 /目的小区的期望接收信号功率, 可能会出现 UE传输 功率受限。 网络可以基于 UE测量中上报的路损等参数, 将 UE向源和目的 小区的上行传输分配在不同的时隙上, 以降低传输功率受限的概率。
结合实施例, 描述了本发明的实现方式, 虽然上述描绘主要基于流程 描绘, 本领域技术人员知道, 根据这些描绘, 可以利用不同的智能或非智 能模块或 CPU及 DSP实现本发明的装置, 这些模块可以包括处理器、 电子 设备、 硬件设备、 电子组件、 逻辑电路、 存储器等或者上述的任意组合。
本领域普通技术人员应当理解, 信息和信号可以使用任意多种不同的 技术和方法来表示。 例如, 在贯穿上面的描述中提及或教科书中提及的数 据、 指令、 命令、 信息、 信号、 比特、 符号和码片可以用电压、 电流、 电 磁波、 磁场或粒子、 光场或粒子或者其任意组合来表示。
本领域普通技术人员还应当明白, 结合本申请所公开内容描述的各种 示例性的逻辑框、 模块、 电路和算法歩骤均可以实现成电子硬件、 计算机 软件或二者的组合。 为了清楚地表示硬件和软件之间的可交换性, 上面对 各种示例性的组件、 框、 模块、 电路和歩骤均围绕其功能进行了总体描述。 至于这种功能是实现成硬件还是实现成软件, 取决于特定的应用和对整个 系统所施加的设计约束条件。 熟练的技术人员可以针对每个特定应用, 以 变通的方式实现所描述的功能, 但是, 这种实现决策不应解释为背离本发 明的保护范围。
用于执行本申请所述功能的通用处理器、 数字信号处理器 (DSP ) 、 专 用集成电路 (ASIC ) 、 现场可编程门阵列 (FPGA ) 或其它可编程逻辑器件、 分立门或者晶体管逻辑器件、 分立硬件组件或者其任意组合, 可以实现或 执行结合本申请所公开内容描述的各种示例性的逻辑框图、 模块和电路。 通用处理器可以是微处理器, 或者, 该处理器也可以是任何常规的处理器、 控制器、 微控制器或者状态机。 处理器还可以实现为计算设备的组合, 例 如, DSP 和微处理器的组合、 多个微处理器、 一个或多个微处理器与 DSP 内核的结合, 或者任何其它此种结构。
结合本申请所公开内容描述的方法的歩骤或者算法可直接体现为硬 件、 由处理器执行的软件模块或二者组合。 软件模块可以位于 RAM存储器、 闪存、 ROM存储器、 EPR0M存储器、 EEPR0M存储器、 寄存器、 硬盘、 移动 磁盘、 CD-ROM或者本领域已知的任何其它形式的存储介质。 一种示例存储 介质耦接至处理器, 从而使处理器能够从该存储介质读取信息, 且可向该 存储介质写入信息。 或者, 存储介质可以是处理器的组成部分。 处理器和 存储介质可以位于 AS IC中。 该 ASIC可以位于用户终端。 当然, 处理器和 存储介质也可以作为分离组件位于用户终端中。
在一个或多个示例性的设计方案中, 本申请所述功能可以用硬件、 软 件、 固件或它们组合的方式来实现。 当使用软件实现时, 可以将这些功能 存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或 代码进行传输。 计算机可读介质包括计算机存储介质和通信介质, 其中通 信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。 存 储介质可以是通用计算机或特殊用途计算机能够存取的任何可用介质。 通 过示例的方式而不是限制的方式,这种计算机可读介质可以包括 RAM、 ROM, EEPR0M、 CD-ROM或其它光盘存储、 磁盘存储介质或其它磁存储设备、 或者 能够用于携带或存储具有指令或数据结构形式的期望的程序代码模块并能 够由通用计算机或特殊用途计算机或通用处理器或特殊用途处理器存取的 任何其它介质。 此外, 任何连接可以适当地称为计算机可读介质。 例如, 如果软件是使用同轴电缆、 光纤电缆、 双绞线、 数字用户线路 (DSL) 或者 诸如红外线、 无线和微波之类的无线技术从网站、 服务器或其它远程源传 输的, 那么同轴电缆、 光纤电缆、 双绞线、 DSL 或者诸如红外线、 无线和 微波之类的无线技术包括在所述介质的定义中。 如本申请所使用的, 盘 ( disk) 和碟 (disc ) 包括压缩光碟 (CD) 、 激光影碟、 光碟、 数字通用 光碟 (DVD) 、 软盘和蓝光光碟, 其中盘通常磁性地复制数据, 而碟则用激 光来光学地复制数据。 上面的组合也应当包括在计算机可读介质的保护范 围之内。
为使本领域任何普通技术人员能够实现或者使用本发明, 上面围绕本 发明进行了描述。 对于本领域普通技术人员来说, 对本发明的各种修改是 显而易见的, 并且, 本申请定义的总体原理也可以在不脱离本发明的精神 或保护范围的基础上适用于其它变型。 因此, 本发明并不限于本申请所描 述的示例和设计方案, 而是与本申请公开的原理和新颖性特征的最广范围 相一致。

Claims

权 利 要 求 书
1 . 一种通信系统中跨小区切换的方法, 所述方法包括歩骤:
确定可用的与待切换的目标服务小区建立通信链路的其它维空间; 在与所述待切换的小区的通信链路通过所述确定的可用的其它维空间 可靠建立后, 断开与源服务小区的连接, 切换到所述待切换的目标服务小 区。
2 . 如权利要求 1所述的方法, 所述确定可用的其它维空间包括: 接收 指定的其它维空间的信息和指令; 其中, 如果与所述源服务小区的通信达 到满负荷而没有空余的维空间时, 根据所述接收的信息和指令释放部分维 空间, 成为所述可用的其它维空间。
3. 如权利要求 1所述的方法, 还包括歩骤: 获取可用小区的列表; 监 控测量所述列表中的小区; 根据所述监控测量, 报告可备用的切换小区列 表; 接收被选定的所述待切换的目标服务小区的信息。
4. 如权利要求 1或 2或 3所述的方法, 其中所述维空间包括下列维空 间的至少一个或其组合: 时域维空间, 频域维空间。
5 . 如权利要求 4所述的方法, 所述确定可用的其它维空间包括: 确定 所用的载波; 确定所用的时隙或时隙集, 以在所述所用的载波和时隙与所 述目标服务小区建立可靠的下行通信链路; 获取通信链路的信息。
6. 如权利要求 5所述的方法, 所述获取通信链路的信息包括 TA和 P0 , 所述方法包括: 切换到所述目标服务小区后, 如果需要切换到新的载波, 所述新的载波通信链路基于所述获取的 TA和 P0设立其采用的 TA和 P0。
7. 如权利要求 5所述的方法, 其中, 在进行 DCH 信道切换时, 采用与 所述源服务小区不同的时隙与所述目标服务小区 DCH 信道建立。
8. 如权利要求 5所述的方法, 在进行 HSPA 信道切换时, RNC将限制 所述源服务小区向 UE传输数据时不采用为目标服务小区分配的时隙资源。
9. 如权利要求 5所述的方法, 其中, 所述所用的载波包括与所述源服 务小区通信的相同的载波或不同的载波; 所述所用的时隙包括与所述源服 务小区通信的相同的时隙或不同的时隙, 其中, 所述所用的载波和所用的 时隙 /时隙集中至少一个不同。
10. 一种通信系统中跨小区切换的方法, 所述方法包括歩骤: 接收需进行的测量类型和小区列表,根据接收的信息, 进行测量, 反馈 所述测量的结果;
接收基于所述测量的结果触发的切换指令, 利用分配的物理信道建立 与源服务小区和目标服务小区通信;
在所述分配的物理信道使用 SB (Special Burst)与所述目标切换小区 通信以进行时间同歩和功率控制, 同时, 维持与所述源服务小区的数据交 换;
在与所述目标服务小区的建立的链路达到预定标准时, 发送切换完成 消息并将 DL/UL数据链路切换到所述目标服务小区。
11.如权利要求 10所述的方法, 其中所述使用 SB包括: 在 HSPA传输 时, 如果没有配置伴随 DPCH, 使用 E-DCH 上的 SB (Special Burst) 和监 听 DL HS-SCCH/E-AGCH等控制信道与所述目标切换小区进行时间同歩和功 率 /速率控制。
12. 一种通信系统中跨小区切换的装置, 包括用于实现权利要求 1-11 的方法的模块。
PCT/CN2010/070779 2010-02-26 2010-02-26 通信系统中跨小区切换的方法和装置 WO2011103722A1 (zh)

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