KR20160123469A - Method and apparatus for controlling physical cell identifier - Google Patents

Method and apparatus for controlling physical cell identifier Download PDF

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Publication number
KR20160123469A
KR20160123469A KR1020150053403A KR20150053403A KR20160123469A KR 20160123469 A KR20160123469 A KR 20160123469A KR 1020150053403 A KR1020150053403 A KR 1020150053403A KR 20150053403 A KR20150053403 A KR 20150053403A KR 20160123469 A KR20160123469 A KR 20160123469A
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KR
South Korea
Prior art keywords
pci
new
information
mac
base station
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KR1020150053403A
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Korean (ko)
Inventor
신재승
박애순
윤미영
이경석
황현용
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한국전자통신연구원
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Priority to KR1020150053403A priority Critical patent/KR20160123469A/en
Publication of KR20160123469A publication Critical patent/KR20160123469A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures

Abstract

An apparatus for controlling a physical cell identifier (PCI) detects a collision of an assigned PCI, determines a change of the PCI to a new PCI, and transmits PCI information including the new PCI to a connected terminal. According to an embodiment of the present invention, the apparatus for controlling a PCI can quickly use the new PCI without additional overhead.

Description

Field of the Invention [0001] The present invention relates to a physical layer cell identifier control apparatus,

The present invention relates to an apparatus and method for controlling a physical layer cell identifier, and more particularly, to a physical layer cell identifier control apparatus and method for dynamically changing a physical layer cell identifier to resolve conflicts of the same physical layer cell identifiers assigned to at least two cells .

Recently, mobile base stations that are installed in buses, trains, subways, etc. to move with users and provide communication links with networks are increasing in interest. Also, standardization organizations such as 3GPP standardize related to mobile relays It is progressing.

The mobile station provides the same function as that of the macro base station. When the mobile station constructs a unique cell and performs an access procedure, the mobile station finally transmits a bearer capable of communicating with the network through the macro base station And provides a role of relaying data between the terminal and the macro base station.

The mobile base station receives configuration information such as a physical cell identifier (PCI) from an operation management and maintenance (OAM) server (or SON server) to operate in the base station mode.

The PCI is an identifier for a cell, and is composed of a cell group identifier for identifying a cell and a cell identifier for distinguishing a sector, and a total of 504 PCIs are available in the mobile communication network. In particular, since a mobile station can operate as one sector using an omnidirectional antenna instead of three sectors, when a macro is connected to a macro base station and PCI is allocated, the neighboring macro base stations and mobile stations It is possible to allocate a PCI that does not overlap with neighboring mobile base stations within a range other than the value assigned to the macro base stations.

However, even if a different PCI is allocated to the neighboring macro base station and neighboring mobile base stations at the beginning of the characteristic of the mobile base station, the PCI may be close to the same mobile base station during the movement.

For example, when the number of mobile base stations operating in one macro base station region is 504 or more, since the range of allocated PCI is 0 to 503, mobile base stations having the same PCI are present in the corresponding area, There may be a possibility of approaching distance. In addition, due to the characteristics of the mobile base station which is free to move, it is possible to move from one macro base station area to another surrounding macro base station area. Therefore, even if the PCIs of the mobile base stations existing in one macro base station region are adjusted so as not to overlap with each other, the possibility of being close to another mobile base station to which the same PCI is allocated by the corresponding base station . In this way, even if a mobile station is allocated a PCI that does not overlap with neighboring base stations through appropriate cell planning, there is a possibility that the mobile station can be close to a base station having the same PCI while moving.

When the mobile station detects a communication failure due to mutual interference or a possibility of a communication failure by using the same PCI as other neighboring mobile stations, a new PCI can be allocated by using the OAM and the SON function.

The PCI is used for scrambling and descrambling most signals, control information, and data transmitted and received on a physical channel for uplink and downlink communication with a terminal. If the procedure defined in the existing 3GPP is followed, the change of the PCI has the same effect as that of all the connected MSs connecting to the new cell, and procedures such as re-connection and bearer reset should be performed, ) State exists, there is a problem that the service is disconnected and the corresponding service must be restarted.

Therefore, there is a need for a method that can guarantee the service continuity while minimizing the influence of the PCI change to the connected terminals.

The object of the present invention is to provide a physical layer cell identifier control apparatus and method capable of ensuring service continuity while minimizing the influence of a PCI change to connected terminals.

According to an embodiment of the present invention, a method of controlling a Physical Cell Identifier (PCI) in a base station is provided. The method for controlling physical layer cell identifiers includes the steps of determining a change to an assigned PCI to a new PCI, informing the connected terminal of a change to the new PCI, and transmitting the signal to the connected terminal To the mobile station.

The notifying step may include signaling the change to the new PCI at the physical layer or the MAC layer.

The signaling may include generating downlink control information including the new PCI, and transmitting the downlink control information through a physical downlink control channel (PDCCH) of the physical layer.

Wherein the signaling step comprises setting the new PCI information in a MAC control element and generating a MAC message in which a Radio Network Temporary Identifier (RNTI) common to all terminals is set in a MAC header, To the mobile station.

The determining may include detecting the collision of the allocated PCI, requesting the allocation of the new PCI to the server, and receiving the new PCI from the server.

The change may include information of the new PCI and information of the set time.

The transmitting of the signal may comprise scrambling the signal to the new PCI after the set time.

According to another embodiment of the present invention, an apparatus for controlling an assigned Physical Cell Identifier (PCI) in a base station is provided. The physical layer cell identifier control apparatus includes a processor, and a transceiver. The processor detects the collision of the allocated PCI and determines the change to the new PCI. The transceiver transmits the PCI information including the new PCI to the connected terminal.

The processor generates downlink control information including the PCI information, and the transceiver can transmit a Physical Downlink Control Channel (PDCCH) including the downlink control information.

The processor sets the PCI information in the MAC control element, generates a MAC message in which a Radio Network Temporary Identifier (RNTI) common to all the terminals is set in the MAC header, and the transceiver can transmit the MAC message .

The processor determines the application time point of the new PCI, and the PCI information may further include the application time point.

According to an embodiment of the present invention, a base station transmits a new PCI to a terminal through signaling on a physical layer or a MAC layer while maintaining a connection state between a terminal and a base station, and all terminals use a new PCI at an appointed time . Accordingly, even if the PCI of the base station is changed, all connected terminals can quickly use the new PCI without any additional overhead such as cell reset, bearer reconnection, and service resumption.

1 is a diagram illustrating a mobile station according to an embodiment of the present invention.
2 is a diagram illustrating an operation of a mobile station according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating values of PCI according to an embodiment of the present invention.
4 is a diagram illustrating an example of a method of allocating a PCI of a mobile station according to an embodiment of the present invention.
5 is a diagram illustrating a method for changing a PCI of a mobile station according to an embodiment of the present invention.
6 is a diagram illustrating an example of a method of transmitting a cell reconfiguration indication message according to an embodiment of the present invention.
7 is a diagram illustrating another example of a method of transmitting a cell reconfiguration indication message according to an embodiment of the present invention.
8 is a block diagram of a physical layer cell identifier control apparatus according to an embodiment of the present invention.

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 and claims, when a section is referred to as "including " an element, it is understood that it does not exclude other elements, but may include other elements, unless specifically stated otherwise.

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

Hereinafter, an apparatus and method for controlling a physical layer cell identifier according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram illustrating a mobile station according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating an operation of a mobile station according to an embodiment of the present invention.

Referring to FIG. 1, a mobile station 100 is installed in a moving means such as a bus, a train, a subway, and the like to provide a communication connection between a mobile terminal and a network.

The mobile station 100 provides the same functions as the macro base stations 210 and 220. When the terminal 300 that has entered a cell area of the mobile station 100 by performing a connection procedure constitutes a unique cell, The terminal 300 establishes a bearer capable of communicating with the network through the connection with the macro base stations 210 and 220 and provides a role of relaying data between the terminal 300 and the macro base stations 210 and 220 .

As shown in FIG. 2, the mobile station 100 operates in the terminal mode when the initial power is turned on. That is, the mobile station 100 sets a terminal mode (S200), accesses the macro base station 210 through a random access procedure (S210), and communicates with the core network through the macro base station 200 (S220).

The mobile base station 100 supports a PCI for operating in the base station mode from the Operation Administration and Maintenance (OAM) server (or SON (Self-Organizing Network) server) 400 provided by the core network and the mobile base station 100 And base station setup information including base station information (S230).

Upon receiving the base station setup information, the mobile station 100 switches to the base station mode (S240) and reconnects to the macro base station 230 supporting the mobile station 100 based on the base station setup information to set up a backhaul bearer (S250, S260), and operates as a base station having a unique cell.

The mobile station 100 broadcasts a synchronization signal and system information to operate as a base station (S270).

A bearer capable of communicating with the terminal 300 is established in step S280 and the terminal 300 and the macro base station 230 are finally connected to the mobile station 100. [ And the like.

FIG. 3 is a diagram illustrating values of PCI according to an embodiment of the present invention.

Referring to FIG. 3, the PCI includes a cell group identifier (CGI) having a value ranging from 0 to 167 for identifying a cell and a cell identifier (Cell ID) having a value ranging from 0 to 2 , CI). Since three CIs such as 0, 1, and 2 can be mapped to one CGI, the number of assignable PCIs is 504, which is 0 to 503 in total.

4 is a diagram illustrating an example of a method of allocating a PCI of a mobile station according to an embodiment of the present invention.

Referring to FIG. 4, it is assumed that the mobile station 100 is connected to the macro base station 200a.

2) of the macro base station 200a connected to the OAM server (400 of FIG. 2) within a total of 504 assignable ranges and a partial area 4, 5 of the macro base stations 200b, 200c, 200d adjacent thereto , 6, and 7 to the mobile station 100 and allocates the base station configuration information including the allocated PCI to the mobile station 100 in a range not exceeding the PCI values allocated to the mobile stations 100, Lt; / RTI > At this time, some of the areas 4, 5, 6 and 7 of the adjacent macro base stations 200b, 200c and 200d are located in sectors of the macro base stations 200b, 200c and 200d adjacent to the sector area 1 in which the mobile station 100 is located. (4, 5, 6, 7).

As described above, the PCI allocated to the mobile station 100 can be used for scrambling signals, control information and data to be transmitted.

In the case of an LTE / LTE-A base station based on OFDMA, since the same frequency resources are used among cells, interference may occur due to collision of synchronization signals, control information and data transmitted from different base stations. Each base station scrambles and transmits signals, control information, and data transmitted to the physical channel using its own PCI. The terminal descrambles signals, control information, and data received from the base station using the PCI of the base station to which the terminal is connected. And scrambles and transmits uplink control information and data to be transmitted to the base station using the PCI of the base station to which the base station is connected.

Therefore, if the base station is allocated different PCIs from neighboring base stations from the OAM server 400, there is a problem in descrambling signals, control information and data to / from the desired base station even if the mobile station is located in an overlapped region of different base stations Does not occur.

However, in the case of the mobile station 100, even if a different PCI is allocated to neighboring macro base stations 200a, 200b, 200c, and 200d and surrounding mobile base stations, the PCI may be close to the same mobile base station .

The mobile station 100 requests a new PCI through the OAM server 400 and changes to a new PCI when a communication failure due to mutual interference occurs or a possibility of a communication failure is detected using the same PCI as other mobile base stations, Resolves a PCI collision problem.

5 is a diagram illustrating a method for changing a PCI of a mobile station according to an embodiment of the present invention.

Referring to FIG. 5, the mobile station 100 communicates with the connected terminals 310 and 320 using the initially assigned PCI (O_PCI) (S510 and S520).

When the mobile station 100 detects a collision with other mobile stations in the vicinity during the movement, the mobile station 100 performs a new cell identifier allocation procedure with the OAM server 400 through the OAM function (S530). Specifically, the mobile station 100 requests the OAM server 400 to allocate a new cell identifier, and receives a new cell identifier N_PCI allocated from the OAM server 400.

The mobile station 100 having allocated the new cell identifier N_PCI transmits a signaling signal informing the UEs 310 and 320 of the cell identifier change to the physical layer or the MAC layer Through the cell reconfiguration indication message (S540). The cell reconfiguration indication message may include a new cell identifier (N_PCI).

After transmitting the cell reconfiguration indication message, the mobile station 100 communicates with the connected terminals 310 and 320 using a new PCI (N_PCI) after the predetermined time (S550, S560). That is, the mobile station 100 scrambles and transmits a synchronization signal, control information, and data using a new PCI (N_PCI). At this time, the predetermined time can be determined considering at least the time required for demodulation and decoding of the reception signaling. For example, when a transmission time interval (TTI) is used as a minimum time unit for transmitting and transmitting data, the predetermined time can be set to a time corresponding to 4 TTIs.

Upon receiving the cell reconfiguration indication message from the mobile subscriber station 100, the UEs 310 and 320 receive a cell reconfiguration indication message and transmit a new PCI N_PCI) can be used.

Meanwhile, the mobile station 100 may determine a timing offset corresponding to the application time point of the new PCI (N_PCI), transmit the timing offset information along with the new cell identifier N_PCI through the cell reconfiguration indication message have.

The mobile station 100 and the terminals 310 and 320 may use a new cell identifier N_PCI after a predetermined time according to the timing offset.

6 is a diagram illustrating an example of a method of transmitting a cell reconfiguration indication message according to an embodiment of the present invention.

Referring to FIG. 6, a Physical Downlink Shared Channel (PDSCH) for transmitting data and a Physical Downlink Control Channel (PDCCH) for transmitting a control signal are included in a downlink physical layer signal transmitted from a base station to a mobile station.

The mobile station 100 may use the PDCCH to signal the new PCI (N_PCI).

The mobile station 100 may generate downlink control information (DCI) including a new PCI (N_PCI) and transmit the DCI through a physical downlink control channel (PDCCH) of the physical layer.

At this time, the DCI may further include timing offset information corresponding to the application time point of the new PCI (N_PCI).

In the current 3GPP standard, there is no format for informing a new PCI change. Therefore, a new DCI format (for example, format 5) is defined to inform a change of a new PCI (N_PCI) N_PCI) to be changed.

7 is a diagram illustrating another example of a method of transmitting a cell reconfiguration indication message according to an embodiment of the present invention.

Referring to FIG. 7, the mobile station 100 may transmit a cell reconfiguration indication message on the MAC layer. That is, the mobile station 100 can use the MAC message with the cell reconfiguration indication message.

The MAC message includes a MAC header and a MAC payload, and the MAC payload may include at least one MAC Control Element (CE) and at least one MAC SDU. The MAC message may optionally further include a padding bit.

The mobile station 100 sets up the new PCI information in one MAC CE, generates a MAC message in which an RNTI (Radio Network Temporary Identifier) set in common to all the terminals is set in the MAC header, and transmits the generated MAC message to the MAC Layer. ≪ / RTI > If necessary, timing offset information, which is the application time point of the new PCI, can be set in the MAC control element together with the new PCI (N_PCI).

Also, when a new RNTI (Radio Network Temporary Identifier) is defined as shown in Table 1 in accordance with the purpose of the PCI change and all the terminals of the mobile station 100 receive the new RNTI defined below, Can be used.

Value (hexa-decimal) RNTI 0000 N / A 0001-003C RNTI, a semi-persistent scheduling C-RNTI, a temporary C-RNTI, an eIMTA-RNTI, a TPC-PUCCH-RNTI and a TPC- 003D-FFF3 C-RNTI, Semi-Persistent Scheduling C-RNTI, eIMTA-RNTI, Temporary C-RNTI, TPC-PUCCH-RNTI and TPC- FFF4 Cell - Reconfig - RNTI FFF5-FFFC Reserved for future use FFFD M-RNTI FFFE P-RNTI FFFF SI-RNTI

8 is a block diagram of a physical layer cell identifier control apparatus according to an embodiment of the present invention.

8, the physical layer cell identifier control apparatus 800 includes a processor 810, a transceiver 820, and a memory 830. The physical layer cell identifier control apparatus 800 may be a mobile base station 100 or a mobile base station 100 itself have. The physical layer cell identifier control apparatus 800 may be the macro base station 200 or a part thereof or the macro base station 200 itself.

Processor 810 detects the collision of the allocated PCI and determines the change to the new PCI. Processor 810 may perform a new PCI allocation procedure to change to a new PCI. When the processor 810 is allocated a new PCI, the processor 810 transmits the PCI change to the new PCI through the transceiver 820 to the connected terminals.

The processor 810 may generate signaling information on the physical layer or the MAC layer and transmit the signaling information through the transceiver 820 as described above. The signaling information in the physical layer may be the DCI information described in FIG. 6, and the signaling information in the MAC layer may be a MAC message.

The transceiver 820 transmits and receives signals, control information, and data to and from the connected terminal.

The memory 830 stores instructions for performing operations in the processor 810 or temporarily loads and stores instructions from a storage device (not shown), and the processor 810 is stored in the memory 830 Execute the loaded command.

The processor 810 and the memory 830 are connected to each other through a bus (not shown), and an input / output interface (not shown) may also be connected to the bus. At this time, a transceiver 820 is connected to the input / output interface, and peripheral devices such as an input device, a display, a speaker, and a storage device may be connected.

The above-described physical layer cell identifier control apparatus and method are described on the basis of the mobile station 100, but the same can be applied to the macro base station.

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded, Such an embodiment can be readily implemented by those skilled in the art from the description of the embodiments described above.

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 (11)

A method for controlling a Physical Cell Identifier (PCI) in a base station,
Determining to change the assigned PCI to a new PCI,
Informing the connected terminal of the change to the new PCI, and
Transmitting a signal to the connected terminal using the new PCI after a predetermined time
The physical layer cell identifier control method comprising: The method of claim 1,
Wherein the informing step comprises signaling a change to the new PCI at a physical layer or a MAC layer. 3. The method of claim 2,
The signaling step
Generating downlink control information including the new PCI, and
And transmitting the downlink control information through a physical downlink control channel (PDCCH) of the physical layer. 3. The method of claim 2,
The signaling step
Setting the new PCI information in the MAC control element and generating a MAC message in which a radio network temporary identifier (RNTI) common to all the terminals is set in the MAC header, and
And transmitting the MAC message. The method of claim 1,
The step of determining
Detecting a collision of the allocated PCI,
Requesting the server to allocate the new PCI, and
And receiving the new PCI from a server. The method of claim 1,
Wherein the change comprises information of the new PCI and information of the set time. The method of claim 1,
Wherein the transmitting comprises scrambling the signal to the new PCI after the set time. An apparatus for controlling an assigned Physical Cell Identifier (PCI) in a base station,
A processor for detecting a collision of the allocated PCI and determining a change to a new PCI, and
A transceiver for transmitting the PCI information including the new PCI to the connected terminal
And a physical layer cell identifier control unit. 9. The method of claim 8,
Wherein the processor generates downlink control information including the PCI information,
Wherein the transceiver transmits a physical downlink control channel (PDCCH) including the downlink control information. 9. The method of claim 8,
The processor sets the PCI information in the MAC control element, generates a MAC message in which a radio network temporary identifier (RNTI) common to all the terminals is set in the MAC header,
Wherein the transceiver transmits the MAC message. 9. The method of claim 8,
The processor determines the application time of the new PCI,
Wherein the PCI information further includes an application time point.
KR1020150053403A 2015-04-15 2015-04-15 Method and apparatus for controlling physical cell identifier KR20160123469A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023222302A1 (en) * 2022-05-19 2023-11-23 Sony Group Corporation Methods and infrastructure equipment to avoid physical cell identifier (pci) collisions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023222302A1 (en) * 2022-05-19 2023-11-23 Sony Group Corporation Methods and infrastructure equipment to avoid physical cell identifier (pci) collisions

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