KR20180063864A - METHOD AND SYSTEM FOR NB-IoT MEASUREMENT GAP CONFIGURATION - Google Patents

Abstract

The present invention provides a method and system to allocate the measurement gap of a position reference signal of an IoT base station. The system includes: a terminal; and a service cell allocating gap offset information between a target cell and a service cell to the terminal and transmitting a control message including the gap offset information to the terminal. The control message includes information about whether the frequency of the target cell is the same as the frequency of the service cell or not, physical resource block index information of a position reference signal in the target cell, and bitmap allocation information of the target cell. As such, the present invention is capable of minimizing power consumption of the terminal, maximally maintaining synchronous tracking when measuring the position of the terminal, minimizing the loss of time for the synchronous tracking of a position reference signal, and minimizing the loss of time for tracking downward link timing.

Description

[0001] METHOD AND SYSTEM FOR NB-IOT MEASUREMENT GAP CONFIGURATION [0002]

The present invention relates to a measurement gap allocation method and system for a position reference signal of an IoT base station.

IoT base station (eNB-IoT) refers to a base station defined by the IoT standard distributed in Release-13 (release-13) in 3GPP.

In this regard, release-14 includes a content related to positioning as a technology for implementing a current IoT base station, and contents for reinforcing a multicast technique and a multi-physical resource block. In more detail, in Release-14, in order to efficiently use the IoT base station terminal, a positioning reference signal (PRS) is used to determine the location of the terminal and to perform various services based on the location of the terminal In particular, a method of assigning a measurement gap, an interface parameter to be applied when a measurement gap is allocated, and a state transition between a terminal and a base station are important issues of Release-14 Is emerging.

According to the definition defined in Release-14, a terminal must measure a position reference signal transmitted from at least three base stations in order to measure its position. The terminal continuously measures the position reference signal. At this time, in order to reduce the amount of power consumed by the UE in measuring the position reference signal, it is necessary to optimize the measurement period and perform carrier switching for measuring the position reference signal transmitted from neighbor base stations, The position reference signal must be measured only after switching or center frequency switching.

When the position reference signal is measured as described above, synchronization tracking between the terminal and the service cell may be interrupted during the measurement of the position reference signal. In addition, in the downlink physical channel of the IoT base station system, since resource allocation between the BS and the MS is performed through the physical resource block, time loss may occur for tracking synchronization by tracking the position reference signal, duplexing scheme allocates the same resource to the uplink, there is a problem that loss occurs in the downlink timing tracking time.

A problem to be solved by the present invention is to provide a method of efficiently allocating resources of a position reference signal when a tracking process for the synchronization time is stably secured and a base station and a terminal share physical resource block resources.

A system for allocating a measurement gap of a position reference signal of an IoT base station according to an embodiment of the present invention includes a terminal; And a service cell for allocating gap offset information between a service cell and a target cell to the terminal and transmitting a control message including the gap offset information to the terminal, And a location reference signal physical resource block index information in the target cell and bitmap allocation information of the target cell.

According to the embodiment of the present invention, it is possible to minimize the power consumption of the UE, maintain the maximum synchronization tracking when measuring the position of the UE, minimize the time loss for the synchronization tracking of the position reference signal, There is also an advantage in that the loss of tracking time to timing can also be minimized.

1 is a flowchart illustrating an operation of a service cell according to an embodiment of the present invention.
2 is a flowchart illustrating an operation of a service cell according to an embodiment of the present invention.
3 is a flowchart illustrating an operation of a service cell according to an embodiment of the present invention.
4 is a flowchart illustrating an operation of a service cell according to an embodiment of the present invention.
5 is a flowchart illustrating an operation of a service cell according to an embodiment of the present invention.
6 is a block diagram illustrating a wireless communication system according to another embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, a terminal is referred to as a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), a high reliability mobile station (HR- A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE) , HR-MS, SS, PSS, AT, UE, and the like.

Also, a base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, eNodeB), an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) BS, ABS, Node B, eNodeB, AP, RAS, BTS, MMR-BS, RS, and so on) , HR-RS, and the like.

1 is a flowchart illustrating an operation of a service cell according to an embodiment of the present invention.

As shown in Fig. 1, in step S101, the service cell receives gap offset information from other base stations.

In step S103, the service cell transmits gap offset information to the UEs. With reference to FIG. 2, step S103 will be described in detail.

In step S105, the serving cell transmits measurement gap information to the UEs.

2 is a flowchart illustrating an operation of a service cell according to an embodiment of the present invention.

As shown in Fig. 2, in step S201, the service cell receives gap offset information from other base stations.

In step S203, the service cell transmits gap offset information, bitmap allocation information of the target cell, physical resource block index information of the target cell, and physical resource frequency information of the target cell to the terminal. At this time, the terminal in the target cell can stop the tracking operation for the position reference signal in the valid subframe by bitmap allocation.

In step S205, the serving cell transmits the measurement gap information to the UEs. In this case, the measurement gap information may be allocated to consecutive M sub-frame lengths. Also, after changing the physical resource block index to the target cell, if the interval in which the position reference signal measurement is performed is an effective sub-frame, the UE performs position reference signal measurement during N measurement intervals. At this time, the UE measures N consecutive subframes of the same position as the location reference signal allocation resource of the target cell.

3 is a flowchart illustrating an operation of a service cell according to an embodiment of the present invention.

As shown in FIG. 3, in step S301, the service cell receives gap offset information from other base stations.

In step S303, the service cell transmits gap offset information, bitmap allocation information of the target cell, physical resource block index information of the target cell, physical resource frequency information of the target cell, and a measurement period for the target cell to the terminal. The target cell divides the Release-13 and Release-14 downlink resources on the time axis and allocates resources and delivers this information to the service cell.

In step S305, the serving cell transmits measurement gap information to the UEs. The service cell periodically transmits the measurement period information of the target cell to the UE in consideration of the measurement period of the service cell and another target cell.

4 is a flowchart illustrating an operation of a service cell according to an embodiment of the present invention.

As shown in FIG. 4, in step S401, when a mobile station is connected to the RRC, a service cell defines a DL effective subframe of Release-14 based on a position reference signal.

In step S403, the serving cell transmits information on the common search space of the Release-14 and the UE search space to the terminal in the target cell, transmits the NPDSCH to the terminal in the target cell, And transmits the position reference signal to the terminal in the target cell.

In step S405, the service cell applies the measurement results of all the position reference signals to the last part of the most recent NPDSCH. The last part of the most recent NPDSCH may contain 2 HARQ NPDSCHs.

5 is a flowchart illustrating an operation of a service cell according to an embodiment of the present invention.

As shown in FIG. 5, in step S501, the serving cell determines whether a physical channel other than the position reference signal is included in an effective subframe of a release-13 downlink, The step S507 is performed.

In step S503, the serving cell defines a downlink valid subframe of Release-14 based on the position reference signal.

In step S505, the service cell transmits information on the common search space of the Release-14 and the UE search space to the UE in the target cell, transmits the NPDSCH to the UE in the target cell, The position reference signal is transmitted to the terminal in the target cell, and step S507 is performed.

In step S507, the service cell performs measurement of the position reference signal using the valid subframe including the position reference signal within the M subframe intervals consecutively with the measurement period T for each UE by the scheduler.

6 is a block diagram illustrating a wireless communication system according to another embodiment.

Referring to FIG. 6, a wireless communication system according to an embodiment includes a base station 610 and a terminal 620.

The base station 610 includes a processor 611, a memory 612, and a radio frequency unit (RF unit) 613. The memory 612 may be coupled to the processor 611 to store various information for driving the processor 611 or at least one program to be executed by the processor 611. [ The wireless communication unit 613 is connected to the processor 611 to transmit and receive a wireless signal. The processor 611 may implement the functions, processes, or methods proposed in the embodiments of the present disclosure. At this time, in the wireless communication system according to the embodiment of the present invention, the wireless interface protocol layer can be implemented by the processor 611. The steps of the base station 610 according to one embodiment may be implemented by the processor 611. [

The terminal 620 includes a processor 621, a memory 622, and a wireless communication unit 623. The memory 622 may be coupled to the processor 621 to store various information for driving the processor 621 or at least one program executed by the processor 621. [ The wireless communication unit 623 is connected to the processor 621 to transmit and receive a wireless signal. The processor 621 may implement the functions, steps, or methods suggested in the embodiments of the present disclosure. At this time, in the wireless communication system according to the embodiment of the present invention, the wireless interface protocol layer can be implemented by the processor 621. [ The steps of terminal 620 according to one embodiment may be implemented by processor 621. [

In an embodiment of the present disclosure, the memory may be located inside or outside the processor, and the memory may be connected to the processor through various means already known. The memory may be any type of volatile or nonvolatile storage medium, e.g., the memory may include read-only memory (ROM) or random access memory (RAM).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (1)

Terminal; And
And a service cell for allocating gap offset information between the service cell and the target cell to the terminal and transmitting a control message including the gap offset information to the terminal,
Wherein the control message further comprises whether a frequency used by the target cell is equal to a frequency used by the service cell, a location reference signal physical resource block index information in the target cell, and bitmap allocation information of the target cell.
A system for assigning a measurement gap of a position reference signal of an IoT base station.

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