WO2016015315A1 - 时频同步维持的方法、时频同步维持的系统和终端 - Google Patents

时频同步维持的方法、时频同步维持的系统和终端 Download PDF

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Publication number
WO2016015315A1
WO2016015315A1 PCT/CN2014/083488 CN2014083488W WO2016015315A1 WO 2016015315 A1 WO2016015315 A1 WO 2016015315A1 CN 2014083488 W CN2014083488 W CN 2014083488W WO 2016015315 A1 WO2016015315 A1 WO 2016015315A1
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WO
WIPO (PCT)
Prior art keywords
base station
cell base
micro
time
frequency synchronization
Prior art date
Application number
PCT/CN2014/083488
Other languages
English (en)
French (fr)
Inventor
朱亚军
张云飞
曹一卿
张晨璐
Original Assignee
宇龙计算机通信科技(深圳)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 宇龙计算机通信科技(深圳)有限公司 filed Critical 宇龙计算机通信科技(深圳)有限公司
Priority to CN201480080936.8A priority Critical patent/CN106576256B/zh
Priority to US15/328,391 priority patent/US10575266B2/en
Priority to PCT/CN2014/083488 priority patent/WO2016015315A1/zh
Priority to EP14898687.0A priority patent/EP3177058B1/en
Publication of WO2016015315A1 publication Critical patent/WO2016015315A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/001Synchronization between nodes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W40/00Communication routing or communication path finding
    • H04W40/005Routing actions in the presence of nodes in sleep or doze mode
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/323Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the physical layer [OSI layer 1]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24Cell structures
    • H04W16/32Hierarchical cell structures

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for maintaining time-frequency synchronization when a micro-cell base station is in a closed state, a system for maintaining a time-frequency synchronization when a micro-cell base station is in a closed state, and a terminal. Background technique
  • 3GPP has done a lot of standardization work.
  • an AB S (Almost Blank Subframe) method is introduced, and the interference source can configure the ABS subframe in some subframes.
  • the interfered node may schedule users whose interference is more severely served on the subframe in which the interference source configures the ABS.
  • a small cell a low-power wireless access node, which can be understood as a micro-cell base station
  • a small cell on/off method is introduced.
  • Some small cells can be turned on or off depending on changes in the business or changes in interference conditions. This can avoid interference between small cells and also has certain benefits for the energy saving of the base station.
  • the small cell In the case of introducing the on/off of the small cell, the small cell needs to transmit a DRS (Discovery Reference Signal) in the off state, so that the terminal can perform cell discovery and measurement related work.
  • DRS Discovery Reference Signal
  • the terminal needs to continuously perform synchronization maintenance on the time-frequency, which is implemented by the terminal based on the pilot transmitted by the base station.
  • the terminal may also need to perform CSI (Channel State Information) measurement when the small cell is in the off state. Feedback, so that the small cell can schedule the user's transmission as soon as it is converted to the on state. Therefore, how to enable the terminal to achieve synchronization on the time-frequency is a technical problem to be solved when the micro-cell base station is in the off state. Summary of the invention
  • the present invention is based on at least one of the above technical problems, and proposes a scheme for maintaining time-frequency synchronization when a micro-cell base station is in a closed state, so that when the micro-cell base station is in a closed state, the terminal can also implement the micro-cell base station. Synchronous maintenance.
  • the present invention provides a method for maintaining time-frequency synchronization when a micro-cell base station is in a closed state, including: detecting, when the micro-cell base station is in a closed state, detecting a macro-cell base station or the micro-cell base station in advance a signal transmitted at a defined subframe position; performing an operation of maintaining time-frequency synchronization with the micro-cell base station based on a signal transmitted at the predefined subframe position.
  • the terminal when the micro cell base station is in the off state, the terminal can detect the signal at the subframe position by detecting the signal sent by the micro cell base station or the macro cell base station at the predefined subframe position. To achieve synchronization maintenance with the micro cell base station.
  • the method before the step of detecting a signal sent by the macro cell base station or the micro cell base station in a predefined subframe position, the method further includes: receiving the micro cell base station or the macro The subframe position and the configuration information of the pilot signal that is sent by the cell base station for the time-frequency synchronization maintenance; the step of detecting the signal sent by the macro cell base station or the micro cell base station in the predefined subframe position is specifically: Detecting, according to the subframe position of the pilot signal used for time-frequency synchronization, the pilot signal for maintaining the time-frequency synchronization; performing the signal according to the signal transmitted at the predefined subframe position The step of performing the operation of maintaining the time-frequency synchronization by the micro-cell base station is specifically: performing the operation of maintaining the time-frequency synchronization according to the configuration information of the pilot signal.
  • the subframe position and configuration information of the pilot signal for time-frequency synchronization maintenance transmitted by the micro cell base station or the macro cell base station are received, so that the terminal can be configured according to the pilot signal used for time-frequency synchronization.
  • the configuration information includes: a type of the pilot signal, a time-frequency resource occupied by the pilot signal, and a quantity of the pilot signal.
  • the micro cell base station or the macro cell base station sends the guide for maintaining time-frequency synchronization through radio resource control signaling, media access control unit signaling, or physical layer signaling.
  • the subframe position of the frequency signal and the configuration information preferably, the frequency signal and the configuration information.
  • the step of detecting the signal sent by the micro cell base station at a predefined subframe position is specifically: detecting a discovery signal sent by the micro cell base station at a predefined subframe position.
  • the terminal performs an operation of performing time-frequency synchronization maintenance based on the discovery signal by detecting a discovery signal transmitted by the micro-cell base station at a predefined subframe position.
  • the micro cell base station or the macro cell base station sends a subframe for transmitting the discovery signal by using radio resource control signaling, media access control unit signaling, or physical layer signaling. Location and configuration information of the discovery signal.
  • the step of detecting a signal sent by the macro cell base station in a predefined subframe position is specifically: detecting a pilot signal sent by the macro cell base station.
  • time-frequency synchronization maintenance with the micro cell base station can also be achieved.
  • the method further includes: measuring channel state information of the micro cell base station; transmitting channel state information of the micro cell base station to the micro cell base station, where the micro cell base station is entering After the state is turned on, the resource scheduling operation is performed according to the channel state information.
  • the terminal when the micro cell base station is in the off state, the terminal measures the channel state information of the micro cell base station, and the cell scheduling operation is directly performed on the terminal when the micro cell base station enters the on state, thereby avoiding the micro cell.
  • the channel state test is performed to increase the time that the terminal waits for resource scheduling, which is beneficial to improving the efficiency of resource scheduling.
  • the step of measuring channel state information of the micro cell base station is specifically: when the micro cell base station sends a state transition instruction that is switched from the off state to the on state, The channel state information of the micro cell base station is measured at a subframe position where the state transition instruction is located.
  • the step of measuring the channel state information of the micro cell base station is specifically: the channel state measurement sent by the micro cell base station before the micro cell base station enters the open state
  • the predefined pilot information measures channel state information of the micro cell base station.
  • the micro cell base station or the macro cell base station sends and transmits the predefined pilot information by using radio resource control signaling, media access control unit signaling, or physical layer signaling.
  • Subframe location and configuration information of the predefined pilot information includes: a type of the pilot information, a time-frequency resource occupied by the pilot information, and a quantity of the pilot information.
  • the step of measuring the channel state information of the micro cell base station is specifically: measuring channel state information of the micro cell base station by using pilot information periodically sent by the micro cell base station.
  • the micro cell base station or the macro cell base station sends the configuration information and the information of the pilot information by using radio resource control signaling, media access control unit signaling, or physical layer signaling. And a transmission period of the pilot information, a subframe position for transmitting the pilot information, and an uploading manner of the channel state information.
  • a system for maintaining time-frequency synchronization when a micro cell base station is in a closed state including: a detecting unit, configured to detect a macro cell base station when the micro cell base station is in a closed state Or a signal sent by the micro cell base station at a predefined subframe position; a processing unit, configured to perform time-frequency synchronization maintenance with the micro cell base station according to the signal sent at the predefined subframe position Operation.
  • the terminal when the micro cell base station is in the off state, the terminal can pass the signal by detecting the signal sent by the micro cell base station or the macro cell base station at the predefined subframe position.
  • the signal at the subframe position is measured to achieve synchronization maintenance with the microcell base station.
  • the method further includes: a receiving unit, configured to receive, by using the micro cell base station or the macro cell base station, a subframe position and configuration information of a pilot signal used for time-frequency synchronization maintenance;
  • the detecting unit is further configured to: detect the pilot signal used for time-frequency synchronization maintenance on a subframe position of the pilot signal used for time-frequency synchronization maintenance;
  • the processing unit is further configured to: according to the The configuration information of the pilot signal performs the operation of maintaining the time-frequency synchronization.
  • the subframe position and configuration information of the pilot signal for time-frequency synchronization maintenance transmitted by the micro cell base station or the macro cell base station are received, so that the terminal can be configured according to the pilot signal used for time-frequency synchronization.
  • the subframe position, the pilot signal used for time-frequency synchronization maintenance is measured at the subframe position, and the time-frequency synchronization maintenance with the micro-cell base station is implemented according to the configuration information of the pilot signal.
  • the configuration information includes: a type of the pilot signal, a time-frequency resource occupied by the pilot signal, and a quantity of the pilot signal.
  • the micro cell base station or the macro cell base station sends the guide for maintaining time-frequency synchronization through radio resource control signaling, media access control unit signaling, or physical layer signaling.
  • the subframe position of the frequency signal and the configuration information preferably, the frequency signal and the configuration information.
  • the detecting unit is specifically configured to: detect a discovery signal that is sent by the micro cell base station at a predefined subframe position.
  • the terminal performs an operation of performing time-frequency synchronization maintenance based on the discovery signal by detecting a discovery signal transmitted by the micro-cell base station at a predefined subframe position.
  • the micro cell base station or the macro cell base station sends a subframe for transmitting the discovery signal by using radio resource control signaling, media access control unit signaling, or physical layer signaling. Location and configuration information of the discovery signal.
  • the detecting unit is specifically configured to: detect a pilot signal sent by the macro cell base station.
  • time-frequency synchronization maintenance with the micro cell base station can also be achieved.
  • the method further includes: a measuring unit, configured to measure channel state information of the micro cell base station; and a sending unit, configured to: use a channel state information of the micro cell base station The information is sent to the micro cell base station, and the micro cell base station performs resource scheduling operation according to the channel state information after entering the open state.
  • the terminal when the micro cell base station is in the off state, the terminal measures the channel state information of the micro cell base station, and the cell scheduling operation is directly performed on the terminal when the micro cell base station enters the on state, thereby avoiding the micro cell.
  • the channel state test is performed to increase the time that the terminal waits for resource scheduling, which is beneficial to improving the efficiency of resource scheduling.
  • the measuring unit is specifically configured to: when the micro cell base station sends a state transition instruction that is switched from the off state to the on state, where the state transition instruction is located The channel state information of the micro cell base station is measured at a subframe position.
  • the measuring unit is specifically configured to: pre-defined pilot information used for channel state measurement sent by the micro cell base station before the micro cell base station enters the open state Measuring channel state information of the micro cell base station.
  • the micro cell base station or the macro cell base station sends and transmits the predefined pilot information by using radio resource control signaling, media access control unit signaling, or physical layer signaling.
  • Subframe location and configuration information of the predefined pilot information includes: a type of the pilot information, a time-frequency resource occupied by the pilot information, and a quantity of the pilot information.
  • the measuring unit is specifically configured to: measure channel state information of the micro cell base station by using pilot information periodically sent by the micro cell base station.
  • the micro cell base station or the macro cell base station sends the period and the transmission station of the pilot information by using radio resource control signaling, medium access control unit signaling, or physical layer signaling.
  • the subframe position of the pilot information and the manner of uploading the channel state information are used.
  • a terminal comprising: any one of the above technologies
  • the system in which the micro-cell base station described in the scheme is maintained in time-frequency synchronization when the base station is in the off state.
  • the terminal can also maintain synchronization with the micro cell base station when the micro cell base station is in the off state, and can measure the channel state of the micro cell base station when the micro cell base station is in the off state.
  • FIG. 1 is a schematic flow chart showing a time-frequency synchronization maintaining method when a micro cell base station is in an off state according to an embodiment of the present invention
  • FIG. 2 is a schematic block diagram of a time-frequency synchronization maintaining system when a micro cell base station is in an off state according to an embodiment of the present invention
  • FIG. 3 is a block diagram showing a structure of a time-frequency synchronization maintaining system when a micro cell base station is in an off state according to an embodiment of the present invention
  • FIG. 4 shows a schematic diagram of a subframe structure for transmitting pilot information for channel state measurement, in accordance with an embodiment of the present invention. detailed description
  • FIG. 1 is a flow chart showing a method of maintaining time-frequency synchronization when a micro cell base station is in an off state according to an embodiment of the present invention.
  • a method for maintaining a time-frequency synchronization when a micro-cell base station is in a closed state includes: Step 102: When a micro-cell base station is in a closed state, detecting a macro-cell base station or a And transmitting, by the micro cell base station, a signal that is sent by using the pre-defined subframe position. Step 104: Perform an operation of maintaining time-frequency synchronization with the micro cell base station according to the signal sent at the predefined subframe position.
  • the terminal can detect the signal at the subframe position by detecting the signal sent by the micro cell base station or the macro cell base station at the predefined subframe position. To achieve synchronization maintenance with the micro cell base station.
  • the method before the step of detecting a signal sent by the macro cell base station or the micro cell base station in a predefined subframe position, the method further includes: receiving the micro cell base station or the macro The subframe position and the configuration information of the pilot signal that is sent by the cell base station for the time-frequency synchronization maintenance; the step of detecting the signal sent by the macro cell base station or the micro cell base station in the predefined subframe position is specifically: Detecting, according to the subframe position of the pilot signal used for time-frequency synchronization, the pilot signal for maintaining the time-frequency synchronization; performing the signal according to the signal transmitted at the predefined subframe position The step of performing the operation of maintaining the time-frequency synchronization by the micro-cell base station is specifically: performing the operation of maintaining the time-frequency synchronization according to the configuration information of the pilot signal.
  • the subframe position and configuration information of the pilot signal for time-frequency synchronization maintenance transmitted by the micro cell base station or the macro cell base station are received, so that the terminal can be configured according to the pilot signal used for time-frequency synchronization.
  • the subframe position, the pilot signal used for time-frequency synchronization maintenance is measured at the subframe position, and the time-frequency synchronization maintenance with the micro-cell base station is implemented according to the configuration information of the pilot signal.
  • the configuration information includes: a type of the pilot signal, a time-frequency resource occupied by the pilot signal, and a quantity of the pilot signal.
  • the micro cell base station or the macro cell base station sends the guide for maintaining time-frequency synchronization through radio resource control signaling, media access control unit signaling, or physical layer signaling.
  • the subframe position of the frequency signal and the configuration information preferably, the frequency signal and the configuration information.
  • the step of detecting the signal sent by the micro cell base station at a predefined subframe position is specifically: detecting a discovery signal sent by the micro cell base station at a predefined subframe position.
  • the terminal performs an operation of performing time-frequency synchronization maintenance based on the discovery signal by detecting a discovery signal transmitted by the micro-cell base station at a predefined subframe position.
  • the micro cell base station or the macro cell base station is used for transmitting by using radio resource control signaling, media access control unit signaling, or physical layer signaling.
  • the subframe position of the discovery signal and the configuration information of the discovery signal is used for transmitting by using radio resource control signaling, media access control unit signaling, or physical layer signaling.
  • the step of detecting a signal sent by the macro cell base station in a predefined subframe position is specifically: detecting a pilot signal sent by the macro cell base station.
  • time-frequency synchronization maintenance with the micro cell base station can also be achieved.
  • the method further includes: measuring channel state information of the micro cell base station; transmitting channel state information of the micro cell base station to the micro cell base station, where the micro cell base station is entering After the state is turned on, the resource scheduling operation is performed according to the channel state information.
  • the terminal when the micro cell base station is in the off state, the terminal measures the channel state information of the micro cell base station, and the cell scheduling operation is directly performed on the terminal when the micro cell base station enters the on state, thereby avoiding the micro cell.
  • the channel state test is performed to increase the time that the terminal waits for resource scheduling, which is beneficial to improving the efficiency of resource scheduling.
  • the step of measuring channel state information of the micro cell base station is specifically: when the micro cell base station sends a state transition instruction that is switched from the off state to the on state, The channel state information of the micro cell base station is measured at a subframe position where the state transition instruction is located.
  • the step of measuring the channel state information of the micro cell base station is specifically: the channel state measurement sent by the micro cell base station before the micro cell base station enters the open state
  • the predefined pilot information measures channel state information of the micro cell base station.
  • the micro cell base station or the macro cell base station sends and transmits the predefined pilot information by using radio resource control signaling, media access control unit signaling, or physical layer signaling.
  • Subframe location and configuration information of the predefined pilot information includes: a type of the pilot information, and a time frequency occupied by the pilot information. Resource, the amount of the pilot information.
  • the step of measuring the channel state information of the micro cell base station is specifically: measuring channel state information of the micro cell base station by using pilot information periodically sent by the micro cell base station.
  • the micro cell base station or the macro cell base station sends the configuration information and the information of the pilot information by using radio resource control signaling, media access control unit signaling, or physical layer signaling. And a transmission period of the pilot information, a subframe position for transmitting the pilot information, and an uploading manner of the channel state information.
  • FIG. 2 is a schematic block diagram of a time-frequency synchronization maintaining system when a microcell base station is in an off state, in accordance with an embodiment of the present invention.
  • the time-frequency synchronization maintaining system 200 when the micro-cell base station is in the off state includes: 202: a detecting unit, configured to detect a macro cell when the micro-cell base station is in a closed state a signal sent by the base station or the micro cell base station at a predefined subframe position; 204 processing unit, configured to perform time frequency with the micro cell base station according to the signal sent at the predefined subframe position Synchronous maintenance operation.
  • the terminal when the micro cell base station is in the off state, the terminal can detect the signal at the subframe position by detecting the signal sent by the micro cell base station or the macro cell base station at the predefined subframe position. To achieve synchronization maintenance with the micro cell base station.
  • the method further includes: a receiving unit 206, configured to receive, by using the micro cell base station or the macro cell base station, a subframe position and configuration information of a pilot signal used for time-frequency synchronization maintenance;
  • the detecting unit 202 is further configured to: detect the pilot signal used for time-frequency synchronization maintenance on a subframe position of the pilot signal used for time-frequency synchronization maintenance; and
  • the processing unit 204 is further configured to: The operation of maintaining the time-frequency synchronization is performed according to the configuration information of the pilot signal.
  • the subframe position and configuration information of the pilot signal for time-frequency synchronization maintenance transmitted by the micro cell base station or the macro cell base station are received, so that the terminal can be configured according to the pilot signal used for time-frequency synchronization.
  • the configuration information includes: a type of the pilot signal, a time-frequency resource occupied by the pilot signal, and a quantity of the pilot signal.
  • the micro cell base station or the macro cell base station sends the guide for maintaining time-frequency synchronization through radio resource control signaling, media access control unit signaling, or physical layer signaling.
  • the subframe position of the frequency signal and the configuration information preferably, the frequency signal and the configuration information.
  • the detecting unit 202 is specifically configured to: detect a discovery signal that is sent by the micro cell base station at a predefined subframe position.
  • the terminal performs an operation of performing time-frequency synchronization maintenance based on the discovery signal by detecting a discovery signal transmitted by the micro-cell base station at a predefined subframe position.
  • the discovery signal transmitted by the micro cell base station at a predefined subframe position enables the terminal to perform synchronization maintenance based on the subframe position of the discovery signal transmission.
  • the micro cell base station or the macro cell base station sends a subframe for transmitting the discovery signal by using radio resource control signaling, media access control unit signaling, or physical layer signaling. Location and configuration information of the discovery signal.
  • the detecting unit 202 is specifically configured to: detect a pilot signal sent by the macro cell base station.
  • time-frequency synchronization maintenance with the micro cell base station can also be achieved.
  • the method further includes: a measuring unit 208, configured to measure channel state information of the micro cell base station; and a sending unit 210, configured to send channel state information of the micro cell base station to the micro
  • the area base station is configured to perform resource scheduling operations according to the channel state information after the micro cell base station enters an on state.
  • the terminal when the micro cell base station is in the off state, the terminal measures the channel state information of the micro cell base station, and the cell scheduling operation is directly performed on the terminal when the micro cell base station enters the on state, thereby avoiding the micro cell.
  • the channel state test is performed to increase the time that the terminal waits for resource scheduling, which is beneficial to improving the efficiency of resource scheduling.
  • the measuring unit 208 is specifically configured to: when the micro cell base station sends a state transition instruction that is switched from the off state to the on state, where the state transition instruction is located The channel state information of the micro cell base station is measured at the subframe position.
  • the measuring unit 208 is specifically configured to: pre-defined pilots for channel state measurement sent by the micro cell base station before the micro cell base station enters the open state The information measures channel state information of the micro cell base station.
  • the micro cell base station or the macro cell base station sends and transmits the predefined pilot information by using radio resource control signaling, media access control unit signaling, or physical layer signaling.
  • Subframe location and configuration information of the predefined pilot information includes: a type of the pilot information, a time-frequency resource occupied by the pilot information, and a quantity of the pilot information.
  • the measuring unit 208 is specifically configured to: measure channel state information of the micro cell base station by using pilot information periodically sent by the micro cell base station.
  • the micro cell base station or the macro cell base station sends the period and the transmission station of the pilot information by using radio resource control signaling, medium access control unit signaling, or physical layer signaling.
  • the subframe position of the pilot information and the manner of uploading the channel state information are used.
  • the terminal always has a cell connection to ensure mobility.
  • the terminal has the capability of CA (Carrier Aggregation) or DC (Dual Connectivity), and the small cell has been used as an Scell (ie, micro cell) or SCG (Secondary Cell Group) of the terminal.
  • CA Carrier Aggregation
  • DC Direct Connectivity
  • Scell ie, micro cell
  • SCG Secondary Cell Group
  • One of the Scells in the cell group is configured for the terminal.
  • Pcell is used to ensure the connection of the terminal during the move. Need It is illustrated that the Pcell in FIG. 3 is only an example of a macro cell. Based on the same method, the macro cell may also be a micro cell. The small cell acts as an Scell to provide an increase in the data rate for the terminal. This can be done through the Scell configuration in the CA or DC mechanism.
  • the present invention proposes the following methods for how to implement channel measurement when the micro cell base station is in the off state:
  • Method 1 Scell schedules the terminal through a more conservative method.
  • the terminal can obtain CSI (Channel State Information) information through DRS (Discovery Reference signaling), but due to DRS The transmission period is relatively long.
  • CSI Channel State Information
  • DRS Discovery Reference signaling
  • DSI-based CSI measurement may not know the accurate CSI information. Therefore, Scell can only schedule terminals through a more conservative method. For example, Scell can only use single rank.
  • a lower MCS Multipoint Conferencing Server
  • Method 2 The Scell uses the most recent measured CSI information to serve the terminal.
  • Method 3 The terminal transmits and reports the CSI on the subframe of the DCI indicating that the terminal is about to enter the on state on the Scell.
  • the configuration information based on which pilot and pilot is measured needs to be notified to the terminal in advance.
  • pilot information for performing CSI measurement is transmitted on a subframe before the Scell enters the on-state subframe, and the pilot information may be CRS, CSI-S or other Pilot for CSI measurements.
  • the location of the pilot transmission is predefined, and the Pcell or Scell can pass RRC (Radio Resource Control) signaling, MAC (Medium Access Control) (Control Element) or It is the physical layer signaling to transmit the subframe information of the pilot and the configuration information of the pilot.
  • RRC Radio Resource Control
  • MAC Medium Access Control
  • the Scell can periodically transmit certain pilots for the terminal to perform CSI measurement.
  • the Pcell or Scell can notify the pilot transmission period, time and frequency, etc. through RRC signaling, MAC CE or physical layer signaling. .
  • the Pcell or Scell can configure the terminal to perform periodic CSI reporting.
  • Method 1 The terminal performs synchronization maintenance based on the subframe position of the DRS transmission.
  • Method 2 The Pcell or the Scell informs the terminal of the position of the pilot transmission maintained by the time-frequency synchronization through the RRC signaling, the MAC CE or the physical layer signaling, and the related configuration, and the pilot may be defined in the current protocol version. Pilot types such as PSS, SSS, CS, CSI-S or other types of pilots.
  • Method 3 In the case where the Pcell is present, the terminal can adjust the time-frequency synchronization error on the Scell by detecting the pilot transmission on the Pcell, thereby realizing the maintenance of the time-frequency synchronization.
  • the present invention provides a scheme for maintaining a time-frequency synchronization when a new micro-cell base station is in a closed state, so that the terminal can also be implemented when the micro-cell base station is in a closed state.
  • the synchronization with the micro cell base station maintains the indispensable function of the micro cell base station under the fast switching mechanism, and can measure the channel state of the micro cell base station when the micro cell base station is in the off state.

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

Abstract

本发明提供了一种微小区基站处于关闭状态时的时频同步维持的方法、一种微小区基站处于关闭状态时的时频同步维持的系统和一种终端,其中,微小区基站处于关闭状态时的时频同步维持的方法,包括:在所述微小区基站处于关闭状态时,检测宏小区基站或所述微小区基站在预定义的子帧位置上发送的信号;根据在所述预定义的子帧位置上发送的信号,执行与所述微小区基站进行时频同步维持的操作。本发明的技术方案使得终端在微小区基站处于关闭状态时,也能够实现与微小区基站的同步维持,构成了微小区基站在快速开关机制下必不可少的功能。

Description

说 明 书 时频同步维持的方法、 时频同步维持的系统和终端 技术领域
本发明涉及通信技术领域, 具体而言, 涉及一种微小区基站处于关闭 状态时的时频同步维持的方法、 一种微小区基站处于关闭状态时的时频同 步维持的系统和一种终端。 背景技术
在目前的无线通信系统中, 为了进一步的提高网络中的容量, 基站的 小型化和网络节点的密集化已经成为了必然的选择。 然而网络节点的密集 化必然会带来相互间的干扰的问题, 节点间的强干扰会极大地影响系统的 性能。
为了解决低功率节点之间的干扰问题, 3GPP 已经做了大量的标准化 工作。 在 R10/11 阶段针对宏基站和低功率基站同频工作的场景下, 引入 了 AB S ( Almost Blank Subframe, 近乎空白子帧) 的方法, 干扰源可以在 某些子帧上配置 ABS子帧, 被干扰节点可以在干扰源配置 ABS的子帧上 调度其服务的受干扰比较严重的用户。 在目前的 R12阶段, 考虑了更加密 集的 small cell (一种低功率的无线接入节点, 可以理解为微小区基站) 部 署的场景, 引入了 small cell 的 on/off 的方法。 可以根据业务的变化或是 干扰情况的变化去开启或是关闭某些 small cells。 这样可以避免 small cell 之间的干扰, 同时对于基站的节能也有一定的好处。
在引入 small cell的 on/off的情况下, small cell在 off的状态下需要发 送 DRS ( Discovery Reference signaling, 发现信号) , 以便于终端去做小 区发现及测量相关的工作。 然而在传统的机制下, 终端需要不断地去做时 频上的同步维持, 这是终端基于基站发送的导频来实现的。 另外为了节省 on/off 情况下小区状态的转换时延, 还可能需要终端在 small cell处于 off 状态下去进行 CSI ( Channel State Information, 信道状态检测) 的测量并 反馈, 以便 small cell在转化成 on的状态后可以尽快的调度用户的传输。 因此, 如何在微小区基站处于关闭状态时, 使终端实现时频上的同步 维持成为亟待解决的技术问题。 发明内容
本发明正是基于上述技术问题至少之一, 提出了一种微小区基站处于 关闭状态时的时频同步维持的方案, 使得终端在微小区基站处于关闭状态 时, 也能够实现与微小区基站的同步维持。
有鉴于此, 本发明提出了一种微小区基站处于关闭状态时的时频同步维 持的方法, 包括: 在所述微小区基站处于关闭状态时, 检测宏小区基站或 所述微小区基站在预定义的子帧位置上发送的信号; 根据在所述预定义的 子帧位置上发送的信号, 执行与所述微小区基站进行时频同步维持的操 作。
在该技术方案中, 在微小区基站处于关闭状态时, 通过检测微小区基 站或宏小区基站在预定义的子帧位置上发送的信号, 使得终端能够通过对 该子帧位置上的信号进行测量, 以实现与微小区基站之间的同步维持。
在上述技术方案中, 优选地, 在检测所述宏小区基站或所述微小区基 站在预定义的子帧位置上发送的信号的步骤之前, 还包括: 接收所述微小 区基站或所述宏小区基站发送的用于时频同步维持的导频信号的子帧位置 和配置信息; 检测所述宏小区基站或所述微小区基站在预定义的子帧位置 上发送的信号的步骤具体为: 在所述用于时频同步维持的导频信号的子帧 位置上检测所述用于时频同步维持的导频信号; 根据在所述预定义的子帧 位置上发送的信号, 执行与所述微小区基站进行时频同步维持的操作的步 骤具体为: 根据所述导频信号的配置信息, 执行所述时频同步维持的操 作。
在该技术方案中, 通过接收微小区基站或宏小区基站发送的用于时频 同步维持的导频信号的子帧位置和配置信息, 使得终端能够根据用于时频 同步维持的导频信号所在的子帧位置, 在该子帧位置上测量用于时频同步 维持的导频信号, 并根据该导频信号的配置信息实现与微小区基站的时频 同步维持。
在上述技术方案中, 优选地, 所述配置信息包括: 所述导频信号的类 型、 所述导频信号占用的时频资源、 所述导频信号的数量。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送所述用于时 频同步维持的导频信号的子帧位置以及所述配置信息。
在上述技术方案中, 优选地, 检测所述微小区基站在预定义的子帧位 置上发送的信号的步骤具体为: 检测所述微小区基站在预定义的子帧位置 上发送的发现信号。
在该技术方案中, 终端通过检测微小区基站在预定义的子帧位置上发 送的发现信号, 实现了基于发现信号执行时频同步维持的操作。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送用于传输所 述发现信号的子帧位置以及所述发现信号的配置信息。
在上述技术方案中, 优选地, 检测所述宏小区基站在预定义的子帧位 置上发送的信号的步骤具体为: 检测所述宏小区基站发送的导频信号。
在该技术方案中, 通过检测宏小区基站发送的导频信号, 也能够实现 与微小区基站之间的时频同步维持。
在上述技术方案中, 优选地, 还包括: 测量所述微小区基站的信道状 态信息; 将所述微小区基站的信道状态信息发送至所述微小区基站, 以供 所述微小区基站在进入开启状态后根据所述信道状态信息进行资源调度的 操作。
在该技术方案中, 通过在微小区基站处于关闭状态时, 由终端测量微 小区基站的信道状态信息, 可以在微小区基站在进入开启状态时直接对终 端进行资源调度的操作, 避免在微小区基站进入开启状态后, 再进行信道 状态测试而增加终端等待资源调度的时间, 有利于提高资源调度的效率。
其中, 终端测量信道状态信息有多种方法, 以下列举其中的几种优选 的测量方法:
方法一: 在上述技术方案中, 优选地, 测量所述微小区基站的信道状态信息的 步骤具体为: 在所述微小区基站发送从所述关闭状态切换至所述开启状态 的状态转换指令时, 在所述状态转换指令所处的子帧位置上测量所述微小 区基站的信道状态信息。
方法二:
在上述技术方案中, 优选地, 测量所述微小区基站的信道状态信息的 步骤具体为: 在所述微小区基站进入所述开启状态之前, 通过所述微小区 基站发送的用于信道状态测量的预定义的导频信息测量所述微小区基站的 信道状态信息。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送传输所述预 定义的导频信息的子帧位置以及所述预定义的导频信息的配置信息。 其 中, 所述配置信息包括: 所述导频信息的类型、 所述导频信息占用的时频 资源、 所述导频信息的数量。
方法三:
在上述技术方案中, 优选地, 测量所述微小区基站的信道状态信息的 步骤具体为: 通过所述微小区基站周期性发送的导频信息测量所述微小区 基站的信道状态信息。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送所述导频信 息的配置信息、 所述导频信息的发送周期、 传输所述导频信息的子帧位置 和所述信道状态信息的上传方式。
根据本发明的第二方面, 还提出了一种微小区基站处于关闭状态时的 时频同步维持的系统, 包括: 检测单元, 用于在所述微小区基站处于关闭 状态时, 检测宏小区基站或所述微小区基站在预定义的子帧位置上发送的 信号; 处理单元, 用于根据在所述预定义的子帧位置上发送的信号, 执行 与所述微小区基站进行时频同步维持的操作。
在该技术方案中, 在微小区基站处于关闭状态时, 通过检测微小区基 站或宏小区基站在预定义的子帧位置上发送的信号, 使得终端能够通过对 该子帧位置上的信号进行测量, 以实现与微小区基站之间的同步维持。 在上述技术方案中, 优选地, 还包括: 接收单元, 用于接收所述微小 区基站或所述宏小区基站发送的用于时频同步维持的导频信号的子帧位置 和配置信息; 所述检测单元还用于, 在所述用于时频同步维持的导频信号 的子帧位置上检测所述用于时频同步维持的导频信号; 所述处理单元还用 于, 根据所述导频信号的配置信息, 执行所述时频同步维持的操作。
在该技术方案中, 通过接收微小区基站或宏小区基站发送的用于时频 同步维持的导频信号的子帧位置和配置信息, 使得终端能够根据用于时频 同步维持的导频信号所在的子帧位置, 在该子帧位置上测量用于时频同步 维持的导频信号, 并根据该导频信号的配置信息实现与微小区基站的时频 同步维持。
在上述技术方案中, 优选地, 所述配置信息包括: 所述导频信号的类 型、 所述导频信号占用的时频资源、 所述导频信号的数量。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送所述用于时 频同步维持的导频信号的子帧位置以及所述配置信息。
在上述技术方案中, 优选地, 所述检测单元具体用于: 检测所述微小 区基站在预定义的子帧位置上发送的发现信号。
在该技术方案中, 终端通过检测微小区基站在预定义的子帧位置上发 送的发现信号, 实现了基于发现信号执行时频同步维持的操作。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送用于传输所 述发现信号的子帧位置以及所述发现信号的配置信息。
在上述技术方案中, 优选地, 所述检测单元具体用于: 检测所述宏小 区基站发送的导频信号。
在该技术方案中, 通过检测宏小区基站发送的导频信号, 也能够实现 与微小区基站之间的时频同步维持。
在上述技术方案中, 优选地, 还包括: 测量单元, 用于测量所述微小 区基站的信道状态信息; 发送单元, 用于将所述微小区基站的信道状态信 息发送至所述微小区基站, 以供所述微小区基站在进入开启状态后根据所 述信道状态信息进行资源调度的操作。
在该技术方案中, 通过在微小区基站处于关闭状态时, 由终端测量微 小区基站的信道状态信息, 可以在微小区基站在进入开启状态时直接对终 端进行资源调度的操作, 避免在微小区基站进入开启状态后, 再进行信道 状态测试而增加终端等待资源调度的时间, 有利于提高资源调度的效率。
其中, 终端测量信道状态信息有多种方式, 以下列举其中的几种优选 的测量方式:
方式一:
在上述技术方案中, 优选地, 所述测量单元具体用于: 在所述微小区 基站发送从所述关闭状态切换至所述开启状态的状态转换指令时, 在所述 状态转换指令所处的子帧位置上测量所述微小区基站的信道状态信息。
方式二:
在上述技术方案中, 优选地, 所述测量单元具体用于: 在所述微小区 基站进入所述开启状态之前, 通过所述微小区基站发送的用于信道状态测 量的预定义的导频信息测量所述微小区基站的信道状态信息。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送传输所述预 定义的导频信息的子帧位置以及所述预定义的导频信息的配置信息。 其 中, 所述配置信息包括: 所述导频信息的类型、 所述导频信息占用的时频 资源、 所述导频信息的数量。
方式三:
在上述技术方案中, 优选地, 所述测量单元具体用于: 通过所述微小 区基站周期性发送的导频信息测量所述微小区基站的信道状态信息。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送所述导频信 息的周期、 传输所述导频信息的子帧位置和所述信道状态信息的上传方 式。
根据本发明的另一方面还提出了一种终端, 包括: 如上述任一项技术 方案中所述的微小区基站处于关闭状态时的时频同步维持的系统。
通过以上技术方案, 使得终端在微小区基站处于关闭状态时, 也能够 实现与微小区基站的同步维持, 并且能够实现在微小区基站处于关闭状态 时, 对微小区基站的信道状态进行测量。 附图说明
图 1 示出了根据本发明的实施例的微小区基站处于关闭状态时的时频 同步维持方法的示意流程图;
图 2示出了根据本发明的实施例的微小区基站处于关闭状态时的时频 同步维持系统的示意框图;
图 3示出了根据本发明的实施例的微小区基站处于关闭状态时的时频 同步维持系统的结构示意图;
图 4示出了根据本发明的实施例的用于传输信道状态测量的导频信息 的子帧结构示意图。 具体实施方式
为了能够更清楚地理解本发明的上述目的、 特征和优点, 下面结合附 图和具体实施方式对本发明进行进一步的详细描述。 需要说明的是, 在不 冲突的情况下, 本申请的实施例及实施例中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本发明, 但是, 本发明还可以釆用其他不同于在此描述的其他方式来实施, 因此, 本发明 的保护范围并不受下面公开的具体实施例的限制。
图 1 示出了根据本发明的实施例的微小区基站处于关闭状态时的时频 同步维持的方法的流程示意图。
如图 1 所示, 根据本发明的实施例的微小区基站处于关闭状态时的时 频同步维持的方法, 包括: 步骤 102, 在所述微小区基站处于关闭状态 时, 检测宏小区基站或所述微小区基站在预定义的子帧位置上发送的信 号; 步骤 104, 根据在所述预定义的子帧位置上发送的信号, 执行与所述 微小区基站进行时频同步维持的操作。 在该技术方案中, 在微小区基站处于关闭状态时, 通过检测微小区基 站或宏小区基站在预定义的子帧位置上发送的信号, 使得终端能够通过对 该子帧位置上的信号进行测量, 以实现与微小区基站之间的同步维持。
在上述技术方案中, 优选地, 在检测所述宏小区基站或所述微小区基 站在预定义的子帧位置上发送的信号的步骤之前, 还包括: 接收所述微小 区基站或所述宏小区基站发送的用于时频同步维持的导频信号的子帧位置 和配置信息; 检测所述宏小区基站或所述微小区基站在预定义的子帧位置 上发送的信号的步骤具体为: 在所述用于时频同步维持的导频信号的子帧 位置上检测所述用于时频同步维持的导频信号; 根据在所述预定义的子帧 位置上发送的信号, 执行与所述微小区基站进行时频同步维持的操作的步 骤具体为: 根据所述导频信号的配置信息, 执行所述时频同步维持的操 作。
在该技术方案中, 通过接收微小区基站或宏小区基站发送的用于时频 同步维持的导频信号的子帧位置和配置信息, 使得终端能够根据用于时频 同步维持的导频信号所在的子帧位置, 在该子帧位置上测量用于时频同步 维持的导频信号, 并根据该导频信号的配置信息实现与微小区基站的时频 同步维持。
在上述技术方案中, 优选地, 所述配置信息包括: 所述导频信号的类 型、 所述导频信号占用的时频资源、 所述导频信号的数量。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送所述用于时 频同步维持的导频信号的子帧位置以及所述配置信息。
在上述技术方案中, 优选地, 检测所述微小区基站在预定义的子帧位 置上发送的信号的步骤具体为: 检测所述微小区基站在预定义的子帧位置 上发送的发现信号。
在该技术方案中, 终端通过检测微小区基站在预定义的子帧位置上发 送的发现信号, 实现了基于发现信号执行时频同步维持的操作。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送用于传输所 述发现信号的子帧位置以及所述发现信号的配置信息。
在上述技术方案中, 优选地, 检测所述宏小区基站在预定义的子帧位 置上发送的信号的步骤具体为: 检测所述宏小区基站发送的导频信号。
在该技术方案中, 通过检测宏小区基站发送的导频信号, 也能够实现 与微小区基站之间的时频同步维持。
在上述技术方案中, 优选地, 还包括: 测量所述微小区基站的信道状 态信息; 将所述微小区基站的信道状态信息发送至所述微小区基站, 以供 所述微小区基站在进入开启状态后根据所述信道状态信息进行资源调度的 操作。
在该技术方案中, 通过在微小区基站处于关闭状态时, 由终端测量微 小区基站的信道状态信息, 可以在微小区基站在进入开启状态时直接对终 端进行资源调度的操作, 避免在微小区基站进入开启状态后, 再进行信道 状态测试而增加终端等待资源调度的时间, 有利于提高资源调度的效率。
其中, 终端测量信道状态信息有多种方法, 以下列举其中的几种优选 的测量方法:
方法一:
在上述技术方案中, 优选地, 测量所述微小区基站的信道状态信息的 步骤具体为: 在所述微小区基站发送从所述关闭状态切换至所述开启状态 的状态转换指令时, 在所述状态转换指令所处的子帧位置上测量所述微小 区基站的信道状态信息。
方法二:
在上述技术方案中, 优选地, 测量所述微小区基站的信道状态信息的 步骤具体为: 在所述微小区基站进入所述开启状态之前, 通过所述微小区 基站发送的用于信道状态测量的预定义的导频信息测量所述微小区基站的 信道状态信息。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送传输所述预 定义的导频信息的子帧位置以及所述预定义的导频信息的配置信息。 其 中, 所述配置信息包括: 所述导频信息的类型、 所述导频信息占用的时频 资源、 所述导频信息的数量。
方法三:
在上述技术方案中, 优选地, 测量所述微小区基站的信道状态信息的 步骤具体为: 通过所述微小区基站周期性发送的导频信息测量所述微小区 基站的信道状态信息。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送所述导频信 息的配置信息、 所述导频信息的发送周期、 传输所述导频信息的子帧位置 和所述信道状态信息的上传方式。
图 2示出了根据本发明的实施例的微小区基站处于关闭状态时的时频 同步维持系统的示意框图。
如图 2所示, 根据本发明的实施例的微小区基站处于关闭状态时的时 频同步维持系统 200, 包括: 202 检测单元, 用于在所述微小区基站处于 关闭状态时, 检测宏小区基站或所述微小区基站在预定义的子帧位置上发 送的信号; 204 处理单元, 用于根据在所述预定义的子帧位置上发送的信 号, 执行与所述微小区基站进行时频同步维持的操作。
在该技术方案中, 在微小区基站处于关闭状态时, 通过检测微小区基 站或宏小区基站在预定义的子帧位置上发送的信号, 使得终端能够通过对 该子帧位置上的信号进行测量, 以实现与微小区基站之间的同步维持。
在上述技术方案中, 优选地, 还包括: 接收单元 206, 用于接收所述 微小区基站或所述宏小区基站发送的用于时频同步维持的导频信号的子帧 位置和配置信息; 所述检测单元 202还用于, 在所述用于时频同步维持的 导频信号的子帧位置上检测所述用于时频同步维持的导频信号; 所述处理 单元 204还用于, 根据所述导频信号的配置信息, 执行所述时频同步维持 的操作。
在该技术方案中, 通过接收微小区基站或宏小区基站发送的用于时频 同步维持的导频信号的子帧位置和配置信息, 使得终端能够根据用于时频 同步维持的导频信号所在的子帧位置, 在该子帧位置上测量用于时频同步 维持的导频信号, 并根据该导频信号的配置信息实现与微小区基站的时频 同步维持。
在上述技术方案中, 优选地, 所述配置信息包括: 所述导频信号的类 型、 所述导频信号占用的时频资源、 所述导频信号的数量。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送所述用于时 频同步维持的导频信号的子帧位置以及所述配置信息。
在上述技术方案中, 优选地, 所述检测单元 202具体用于: 检测所述 微小区基站在预定义的子帧位置上发送的发现信号。
在该技术方案中, 终端通过检测微小区基站在预定义的子帧位置上发 送的发现信号, 实现了基于发现信号执行时频同步维持的操作。
在该技术方案中, 通过微小区基站在预定义的子帧位置上发送的发现 信号, 使终端实现基于发现信号传输的子帧位置上去做同步的维持。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送用于传输所 述发现信号的子帧位置以及所述发现信号的配置信息。
在上述技术方案中, 优选地, 所述检测单元 202具体用于: 检测所述 宏小区基站发送的导频信号。
在该技术方案中, 通过检测宏小区基站发送的导频信号, 也能够实现 与微小区基站之间的时频同步维持。
在上述技术方案中, 优选地, 还包括: 测量单元 208, 用于测量所述 微小区基站的信道状态信息; 发送单元 210, 用于将所述微小区基站的信 道状态信息发送至所述微小区基站, 以供所述微小区基站在进入开启状态 后根据所述信道状态信息进行资源调度的操作。
在该技术方案中, 通过在微小区基站处于关闭状态时, 由终端测量微 小区基站的信道状态信息, 可以在微小区基站在进入开启状态时直接对终 端进行资源调度的操作, 避免在微小区基站进入开启状态后, 再进行信道 状态测试而增加终端等待资源调度的时间, 有利于提高资源调度的效率。
其中, 终端测量信道状态信息有多种方式, 以下列举其中的几种优选 的测量方式: 方式一:
在上述技术方案中, 优选地, 所述测量单元 208具体用于: 在所述微 小区基站发送从所述关闭状态切换至所述开启状态的状态转换指令时, 在 所述状态转换指令所处的子帧位置上测量所述微小区基站的信道状态信 息。
方式二:
在上述技术方案中, 优选地, 所述测量单元 208具体用于: 在所述微 小区基站进入所述开启状态之前, 通过所述微小区基站发送的用于信道状 态测量的预定义的导频信息测量所述微小区基站的信道状态信息。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送传输所述预 定义的导频信息的子帧位置以及所述预定义的导频信息的配置信息。 其 中, 所述配置信息包括: 所述导频信息的类型、 所述导频信息占用的时频 资源、 所述导频信息的数量。
方式三:
在上述技术方案中, 优选地, 所述测量单元 208具体用于: 通过所述 微小区基站周期性发送的导频信息测量所述微小区基站的信道状态信息。
在上述技术方案中, 优选地, 所述微小区基站或所述宏小区基站通过 无线资源控制信令、 媒体接入控制单元信令或物理层信令发送所述导频信 息的周期、 传输所述导频信息的子帧位置和所述信道状态信息的上传方 式。
下面结合图 3至图 4详细说明本发明的技术方案。
为了更好的说明本发明的技术方案, 首先给出的场景假设如下:
( 1 ) 终端始终具有一个小区连接用来保证移动性。
( 2 ) 终端是具有 CA ( Carrier Aggregation , 载波聚合) 或是 DC ( Dual Connectivity, 双连通) 的能力, 并且 small cell已经作为终端的一 个 Scell (即微小区) 或是 SCG ( Secondary Cell Group, 副小区组) 中的 某个 Scell配置给终端了。
如图 3 所示, Pcell用来保证终端在移动的过程中的连接情况。 需要 说明的是图 3 中的 Pcell作为宏小区只是一个示例, 基于相同的方法, 宏 小区也可以是一个微小区。 而 small cell作为 Scell为终端提供数据速率的 提升。 这可以通过 CA或是 DC机制中的 Scell配置来实现。
针对如何实现微小区基站处于关闭状态时的信道测量的问题, 本发明 提出了以下几种方法:
方法 1 : Scell通过较保守的方法调度终端, 在这种方法下, 虽然终端 可以通过 DRS ( Discovery Reference signaling , 发现信号) 来获得 CSI ( Channel State Information, 信道状态信息) 的信息, 但是由于 DRS的传 输的周期是比较长的, 在快速开关 small cell的场景下, 基于 DRS的 CSI 测量可能无法获知准确的 CSI信息, 因此 Scell只能通过较保守的方法调 度终端, 比如 Scell 可以只是用单 rank , 较低的 MCS ( Multipoint Conferencing Server, 多点通信服务) 来调度终端。
方法 2: Scell利用最近一次的测量上报的 CSI信息来服务终端。
方法 3 : 终端在 Scell上传输用于指示终端即将进入 on状态的 DCI的 子帧上进行 CSI的测量并上报。 测量基于何种导频以及导频的配置信息需 要提前通知给终端。
方法 4: 如图 4所示, 在 Scell进入到 on状态的子帧之前的某个子帧 上传输用于进行 CSI 测量的导频信息, 该导频信息可以是 CRS, CSI- S 或是其他可以用于 CSI 测量的导频。 该导频传输的位置是预先定义的, Pcell或是 Scell可以通过 RRC ( Radio Resource Control, 无线资源控制) 信令, MAC ( Medium Access Control , 媒体接入控制 ) CE ( Control Element , 控制单元) 或是物理层信令通知传输该导频的子帧信息以及导 频的配置信息。
方法 5: Scell 可以周期的发送某些导频的传输以便终端做 CSI 的测 量, Pcell或是 Scell可以通过 RRC信令, MAC CE或是物理层信令通知 导频的传输周期及时频位置等信息。 同时 Pcell或是 Scell可以配置终端进 行周期性的 CSI上报。
终端在微小区基站处于关闭状态时, 终端如何实现与微小区基站的时 频同步, 本发明提出了以下方法: 方法 1 : 终端基于 DRS传输的子帧位置上去做同步的维持。
方法 2: Pcell或是 Scell通过 RRC信令, MAC CE或是物理层信令通 知终端用作时频同步维持的导频传输的位置以及相关的配置, 该导频可以 是目前协议版本中已经定义的导频类型如 PSS, SSS, C S , CSI- S 或是 其他类型的导频。
方法 3: 在 Pcell存在的情况下, 终端可以通过检测 Pcell上的导频传 输来调整针对 Scell上的时频同步误差, 实现时频同步的维持。
以上结合附图详细说明了本发明的技术方案, 本发明提出了一种新的 微小区基站处于关闭状态时的时频同步维持的方案, 使得终端在微小区基 站处于关闭状态时, 也能够实现与微小区基站的同步维持, 构成了微小区 基站在快速开关机制下必不可少的功能, 并且能够实现在微小区基站处于 关闭状态时, 对微小区基站的信道状态进行测量。
以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于 本领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精 神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明 的保护范围之内。

Claims

权 利 要 求 书
1. 一种微小区基站处于关闭状态时的时频同步维持的方法, 其特征 在于, 包括:
在所述微小区基站处于关闭状态时, 检测宏小区基站或所述微小区基 站在预定义的子帧位置上发送的信号;
根据在所述预定义的子帧位置上发送的信号, 执行与所述微小区基站 进行时频同步维持的操作。
2. 根据权利要求 1 所述的微小区基站处于关闭状态时的时频同步维 持的方法, 其特征在于, 在检测所述宏小区基站或所述微小区基站在预定 义的子帧位置上发送的信号的步骤之前, 还包括:
接收所述微小区基站或所述宏小区基站发送的用于时频同步维持的导 频信号的子帧位置和配置信息;
检测所述宏小区基站或所述微小区基站在预定义的子帧位置上发送的 信号的步骤具体为:
在所述用于时频同步维持的导频信号的子帧位置上检测所述用于时频 同步维持的导频信号;
根据在所述预定义的子帧位置上发送的信号, 执行与所述微小区基站 进行时频同步维持的操作的步骤具体为:
根据所述导频信号的配置信息, 执行所述时频同步维持的操作。
3. 根据权利要求 2 所述的微小区基站处于关闭状态时的时频同步维 持的方法, 其特征在于, 所述配置信息包括:
所述导频信号的类型、 所述导频信号占用的时频资源、 所述导频信号 的数量。
4. 根据权利要去 2 所述的微小区基站处于关闭状态时的时频同步维 持的方法, 其特征在于, 所述微小区基站或所述宏小区基站通过无线资源 控制信令、 媒体接入控制单元信令或物理层信令发送所述用于时频同步维 持的导频信号的子帧位置以及所述配置信息。
5. 根据权利要求 1 所述的微小区基站处于关闭状态时的时频同步维 持的方法, 其特征在于, 检测所述微小区基站在预定义的子帧位置上发送 的信号的步骤具体为: 检测所述微小区基站在预定义的子帧位置上发送的 发现信号。
6. 根据权利要求 5 所述的微小区基站处于关闭状态时的时频同步维 持的方法, 其特征在于, 所述微小区基站或所述宏小区基站通过无线资源 控制信令、 媒体接入控制单元信令或物理层信令发送用于传输所述发现信 号的子帧位置以及所述发现信号的配置信息。
7. 根据权利要求 1 所述的微小区基站处于关闭状态时的时频同步维 持的方法, 其特征在于, 检测所述宏小区基站在预定义的子帧位置上发送 的信号的步骤具体为: 检测所述宏小区基站发送的导频信号。
8. 根据权利要求 1 至 7 中任一项所述的微小区基站处于关闭状态时 的时频同步维持的方法, 其特征在于, 还包括:
测量所述微小区基站的信道状态信息;
将所述微小区基站的信道状态信息发送至所述微小区基站, 以供所述 微小区基站在进入开启状态后根据所述信道状态信息进行资源调度的操 作。
9. 根据权利要求 8 所述的微小区基站处于关闭状态时的时频同步维 持的方法, 其特征在于, 测量所述微小区基站的信道状态信息的步骤具体 为:
在所述微小区基站发送从所述关闭状态切换至所述开启状态的状态转 换指令时, 在所述状态转换指令所处的子帧位置上测量所述微小区基站的 信道状态信息。
10. 根据权利要求 8所述的微小区基站处于关闭状态时的时频同步维 持的方法, 其特征在于, 测量所述微小区基站的信道状态信息的步骤具体 为:
在所述微小区基站进入所述开启状态之前, 通过所述微小区基站发送 的用于信道状态测量的预定义的导频信息测量所述微小区基站的信道状态 信息。
11. 根据权利要求 10 所述的微小区基站处于关闭状态时的时频同步 维持的方法, 其特征在于, 所述微小区基站或所述宏小区基站通过无线资 源控制信令、 媒体接入控制单元信令或物理层信令发送传输所述预定义的 导频信息的子帧位置以及所述预定义的导频信息的配置信息。
12. 根据权利要求 8所述的微小区基站处于关闭状态时的时频同步维 持的方法, 其特征在于, 测量所述微小区基站的信道状态信息的步骤具体 为: 通过所述微小区基站周期性发送的导频信息测量所述微小区基站的信 道状态信息。
13. 根据权利要求 12 所述的微小区基站处于关闭状态时的时频同步 维持的方法, 其特征在于, 所述微小区基站或所述宏小区基站通过无线资 源控制信令、 媒体接入控制单元信令或物理层信令发送所述导频信息的配 置信息、 所述导频信息的发送周期、 传输所述导频信息的子帧位置和所述 信道状态信息的上传方式。
14. 一种微小区基站处于关闭状态时的时频同步维持的系统, 其特征 在于, 包括:
检测单元, 用于在所述微小区基站处于关闭状态时, 检测宏小区基站 或所述微小区基站在预定义的子帧位置上发送的信号;
处理单元, 用于根据在所述预定义的子帧位置上发送的信号, 执行与 所述微小区基站进行时频同步维持的操作。
15. 根据权利要求 14 所述的微小区基站处于关闭状态时的时频同步 维持的系统, 其特征在于, 还包括:
接收单元, 用于接收所述微小区基站或所述宏小区基站发送的用于时 频同步维持的导频信号的子帧位置和配置信息;
所述检测单元还用于, 在所述用于时频同步维持的导频信号的子帧位 置上检测所述用于时频同步维持的导频信号;
所述处理单元还用于, 根据所述导频信号的配置信息, 执行所述时频 同步维持的操作。
16. 根据权利要求 15 所述的微小区基站处于关闭状态时的时频同步 维持的方法, 其特征在于, 所述配置信息包括:
所述导频信号的类型、 所述导频信号占用的时频资源、 所述导频信号 的数量。
17. 根据权利要去 15 所述的微小区基站处于关闭状态时的时频同步 维持的系统, 其特征在于, 所述微小区基站或所述宏小区基站通过无线资 源控制信令、 媒体接入控制单元信令或物理层信令发送所述用于时频同步 维持的导频信号的子帧位置以及所述配置信息。
18. 根据权利要求 14 所述的微小区基站处于关闭状态时的时频同步 维持的系统, 其特征在于, 所述检测单元具体用于:
检测所述微小区基站在预定义的子帧位置上发送的发现信号。
19. 根据权利要求 18 所述的微小区基站处于关闭状态时的时频同步 维持的系统, 其特征在于, 所述微小区基站或所述宏小区基站通过无线资 源控制信令、 媒体接入控制单元信令或物理层信令发送用于传输所述发现 信号的子帧位置以及所述发现信号的配置信息。
20. 根据权利要求 14 所述的微小区基站处于关闭状态时的时频同步 维持的系统, 其特征在于, 所述检测单元具体用于:
检测所述宏小区基站发送的导频信号。
21. 根据权利要求 14至 20中任一项所述的微小区基站处于关闭状态 时的时频同步维持的系统, 其特征在于, 还包括:
测量单元, 用于测量所述微小区基站的信道状态信息;
发送单元, 用于将所述微小区基站的信道状态信息发送至所述微小区 基站, 以供所述微小区基站在进入开启状态后根据所述信道状态信息进行 资源调度的操作。
22. 根据权利要求 21 所述的微小区基站处于关闭状态时的时频同步 维持的系统, 其特征在于, 所述测量单元具体用于:
在所述微小区基站发送从所述关闭状态切换至所述开启状态的状态转 换指令时, 在所述状态转换指令所处的子帧位置上测量所述微小区基站的 信道状态信息。
23. 根据权利要求 21 所述的微小区基站处于关闭状态时的时频同步 维持的系统, 其特征在于, 所述测量单元具体用于:
在所述微小区基站进入所述开启状态之前, 通过所述微小区基站发送 的用于信道状态测量的预定义的导频信息测量所述微小区基站的信道状态 信息。
24. 根据权利要求 23 所述的微小区基站处于关闭状态时的时频同步 维持的系统, 其特征在于, 所述微小区基站或所述宏小区基站通过无线资 源控制信令、 媒体接入控制单元信令或物理层信令发送传输所述预定义的 导频信息的子帧位置以及所述预定义的导频信息的配置信息。
25. 根据权利要求 21 所述的微小区基站处于关闭状态时的时频同步 维持的系统, 其特征在于, 所述测量单元具体用于:
通过所述微小区基站周期性发送的导频信息测量所述微小区基站的信 道状态信息。
26. 根据权利要求 25 所述的微小区基站处于关闭状态时的时频同步 维持的系统, 其特征在于, 所述微小区基站或所述宏小区基站通过无线资 源控制信令、 媒体接入控制单元信令或物理层信令发送所述导频信息的配 置信息、 所述导频信息的发送周期、 传输所述导频信息的子帧位置和所述 信道状态信息的上传方式。
27. 一种终端, 其特征在于, 包括: 如权利要求 14至 26中任一项所 述的微小区基站处于关闭状态时的时频同步维持的系统。
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