JP2013102289A - Mobile communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a mobile station UE to perform cell reselection to change its serving cell from a cell covered by an FDD radio base station eNB to a cell covered by a TDD radio base station eNB that is located in the same location registration area as the FDD radio base station eNB, without the need of detach processing.SOLUTION: The mobile communication method includes: a step in which a mobile station UE transmits a "Service Request" to a mobile management node MME after performing cell reselection of a cell covered by a TDD radio base station eNB #2; a step in which the mobile management node MME transmits an "FDD unique part" and an "FGI bit common part" to the TDD radio base station eNB #2; and a step in which the TDD radio base station eNB #2 acquires a "TDD unique part" from the mobile station UE in response to a "UE Initial Context Setup Request".

Description

  The present invention relates to a mobile communication method.

  In LTE (Long Term Evolution), there are a lot of mandatory functions included in a release, so even a mobile station UE that supports a certain release It does not support essential functions.

  Therefore, in the LTE scheme, “FGI bit set (Feature Group Indicator, function group indication information)” indicating the essential functions supported by the mobile station UE in a certain release (for example, Release-8, Release-10, etc.) is defined. (See Non-Patent Document 1).

  Specifically, the FGI bit set is a set of FGI bits indicating whether or not the mobile station UE corresponds to each group of essential functions in a certain release.

  Further, the FIG bit set is configured to be notified from the mobile station UE to the radio access network by “UE Capability Information”.

  Currently, at the LTE specification development meeting, control is performed by common signaling (for example, RRC signaling) without distinguishing the FGI bit set in the FDD (Frequency Division Duplex) method and the FGI bit set in the TDD (Time Division Duplex) method. To be considered.

  Also, in the LTE specification development meeting, it is considered that the mobile station UE determines whether the radio access network to be connected is the FDD method or the TDD method, and changes the FIG bit set to be reported. .

3GPP TS36.331 Annex B.1 / C.1 3GPP TS 23.401

  However, in the present LTE specification, the mobile station UE needs to perform a detach process when changing the content of “UE Capability (including FGI bit set)”.

  Therefore, in a mobile communication system that supports both the FDD scheme and the TDD scheme, the mobile station UE can transmit the TDD scheme radio from a cell under the FDD scheme radio base station eNB even in the same location registration area. When performing a cell reselection process on a cell under the base station eNB, and when performing a cell reselection process from a cell under the TDD radio base station eNB to a cell under the FDD radio base station eNB, Since the content of “UE Capability” (that is, the content of the FGI bit set) is changed, there is a problem that it is necessary to perform a detach process each time.

  Therefore, the present invention has been made in view of the above-described problems, and the mobile station UE does not perform the detach process, and can perform the TDD scheme from the cell under the FDD radio base station eNB within the same location registration area. An object of the present invention is to provide a mobile communication method capable of performing cell reselection processing on cells under the radio base station eNB.

  Also, the present invention provides a cell reselection from a cell subordinate to a TDD radio base station eNB within the same location registration area to a cell subordinate to an FDD radio base station eNB without performing a detach process. It is an object of the present invention to provide a mobile communication method capable of performing processing.

  A first feature of the present invention is a mobile communication method, in which functional group instruction information indicating essential functions supported by a mobile station includes a common part common to the FDD scheme and the TDD scheme, and an FDD scheme and a TDD scheme. The mobile station that is in a standby state in a cell under the FDD radio base station performs cell reselection processing to a cell under the TDD radio base station. After that, a step of transmitting a service request signal to the mobility management node, and the mobility management node transmits a service request signal specific to the FDD scheme to the TDD radio base station according to the service request signal. Transmitting an initial context setting request signal including a unique part and the common part, and the TDD-type radio base station transmits the initial context Obtaining a unique part specific to the TDD scheme from the mobile station in response to a fixed request signal, and a radio base station of the TDD scheme to the mobile management node And a step of notifying the part.

  A second feature of the present invention is a mobile communication method, in which function group indication information indicating essential functions supported by a mobile station includes a common part common to the FDD method and the TDD method, and an FDD method and a TDD method. The mobile station that is in a standby state in a cell under the TDD radio base station performs cell reselection processing to a cell under the FDD radio base station. Then, a step of transmitting a service request signal to the mobility management node, and the mobility management node transmits a service request signal specific to the TDD scheme to the FDD scheme radio base station according to the service request signal. Transmitting an initial context setting request signal including a unique part and the common part, and the FDD radio base station transmits the initial context In response to a fixed request signal, a step specific to the FDD scheme specific to the FDD scheme is acquired from the mobile station, and the FDD scheme radio base station transmits a unique signature specific to the FDD scheme to the mobility management node. And a step of notifying the part.

  As described above, according to the present invention, the mobile station UE can be controlled by a TDD radio base station eNB from a cell subordinate to an FDD radio base station eNB within the same location registration area without performing a detach process. It is possible to provide a mobile communication method capable of performing cell reselection on the other cell.

  Further, according to the present invention, the mobile station UE performs a cell transfer from a cell under the TDD radio base station eNB within the same location registration area to a cell under the FDD radio base station eNB without performing a detach process. A mobile communication method capable of performing reselection can be provided.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. It is a figure which shows an example of the FGI bit set used with the mobile communication system which concerns on the 1st Embodiment of this invention. 2 is a functional block diagram of a mobility management node according to the first embodiment of the present invention. FIG. FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. FIG. 3 is a sequence diagram illustrating an operation of the mobile communication system according to the first embodiment of the present invention. FIG. 3 is a sequence diagram illustrating an operation of the mobile communication system according to the first embodiment of the present invention.

(Mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 6, the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated. In the present embodiment, an LTE mobile communication system will be described as an example of the mobile communication system according to the present embodiment, but the present invention is also applicable to mobile communication systems other than the LTE system.

  As shown in FIG. 1, the mobile communication system according to the present embodiment includes a mobility management node MME (Mobility Management Entity), an FDD radio base station eNB # 1, and a TDD radio base station eNB # 2. It has.

  As shown in FIG. 2, in the mobile communication system according to the present embodiment, the FGI bit set is configured by “FGI bit common part” and “FDD unique part” or “TDD unique part”.

  Here, “FGI bit common part” is a common part common to the FDD method and the TDD method, “FDD unique part” is a unique part unique to the FDD method, and “TDD unique part” is the TDD method. It is a unique part unique to.

  That is, the FGI bit set for the FDD system is configured by “FGI bit common part” and “FDD unique part”, and the FGI bit set for the TDD system is “FGI bit common part” and “TDD unity part”. It is constituted by.

  In addition, since “FGI bit common part” is not set in consideration of all the capabilities of the mobile station UE, when only “FGI bit common part” is used, the capability of the mobile station UE is maximized. Unable to use communication.

  In addition, the FDD radio base station eNB # 1 (FDD network) and the TDD radio base station eNB # 2 (TDD network) are “FGI bit common part” and “FDD unique part / TDD unique part”. It is comprised so that it can distinguish.

  As illustrated in FIG. 3, the mobile station UE includes a management unit 11, a reception unit 12, and a transmission unit 13.

  The management unit 11 is configured to manage the FGI bit set of the mobile station UE. Specifically, the management unit 11 distinguishes and manages the “FGI bit common part”, “FGI bit common part”, and “TDD unique part” of the mobile station UE as the FGI bit set of the mobile station UE. It is configured.

  The receiving unit 12 is configured to receive various signals (for example, signals shown in FIGS. 5 and 6) from the radio base stations eNB # 1 / eNB # 2 and the mobility management node MME.

  The transmission unit 13 is configured to transmit various signals (for example, signals illustrated in FIGS. 5 and 6) to the radio base stations eNB # 1 / eNB # 2 and the mobility management node MME.

  As illustrated in FIG. 4, the radio base stations eNB # 1 / eNB # 2 include a reception unit 21, a determination unit 22, and a transmission unit 23.

  The receiving unit 21 is configured to receive various signals from the mobile station UE and the mobility management node MME.

  For example, the receiving unit 21 is configured to receive “UE Initial Context Setup Request” from the mobility management node MME.

  Further, the receiving unit 21 receives “UE Capability Information” for notifying “FDD UE Capability” or “TDD UE Capability” including “FDD unique part” or “TDD unique part” from the mobile station UE. It is configured.

  Based on the “FDD unique part” or “TDD unique part” included in the “UE Initial Context Setup Request” received by the receiving unit 21, the determining unit 22 determines that the mobile station UE is the radio base station eNB # 1 / eNB. It is determined whether or not cell reselection processing has been performed from a cell of a scheme different from # 2, that is, whether or not it is necessary to acquire “TDD unique part” or “FDD unique part” from the mobile station UE It is configured.

  The transmission unit 23 is configured to transmit various signals to the mobile station UE and the mobility management node MME.

  For example, when the determination unit 22 determines that the “TDD unique part” or “FDD unique part” needs to be acquired from the mobile station UE by the determination unit 22, the transmission unit 23 transmits “TDD unique” to the mobile station UE. “UE Capability Request (capability request signal of mobile station UE)” requesting “part” or “FDD unique part” is configured to be transmitted.

  Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIG. 5 and FIG.

  First, referring to FIG. 5, in the mobile communication system according to the present embodiment, a mobile station UE in an idle state in a cell under the FDD radio base station eNB # 1 is in a TDD scheme. An operation in a case where cell reselection processing to a cell under radio base station eNB # 2 is performed will be described.

  As shown in FIG. 5, in step S1001, the mobile station UE in a standby state in a cell (FDD network) under the FDD radio base station eNB # 1 moves to a TDD radio base station eNB # 2 in step S1002. A cell reselection process to a subordinate cell (TDD network) is performed.

  In this state, the mobility management node MME still holds “FDD UE Capability” (capability information of the mobile station UE for FDD scheme) as “UE Capability” of the mobile station UE.

  After that, when the mobile station UE needs to transition to the connected state (RRC Connected state) in the cell under the radio base station eNB # 2 of the TDD scheme, in step S1004, the mobile station UE “Service Request (service request signal)” is transmitted.

  In step S1005, the mobility management node MME transmits a “UE Initial Context Setup Request (initial context setting request signal)” including “Bearer Setup information (bearer setting information)” to the radio base station eNB # 2.

  Here, “UE Initial Context Setup Request” notifies “UE Radio Capability” of the mobile station UE.

  Note that the “UE Radio Capability” included in the “UE Initial Context Setup Request” is notified from the mobile station UE to the mobility management node MME in the previous Attach procedure, and “UE Capability” held in the mobility management node MME. Information (including FGI bit set). In the first Attach procedure, the mobility management node MME does not hold such “UE Radio Capability”.

  The “UE Initial Context Setup Request” notifies “FDD unique part” and “FGI bit common part”.

  In step S1006, the radio base station eNB # 2 determines that the notified “FDD unique part” is not a unique part specific to the TDD scheme supported by the radio base station eNB # 2, and in step S1007, Transmit “UE Capability Request” requesting “TDD UE Capability (capability information of mobile station UE for TDD scheme)” including “TDD unique part”.

  In step S1008, the mobile station UE transmits “UE Capability Information” for notifying “TDD UE Capability” including “TDD unique part” to the radio base station eNB # 2.

  Here, the “TDD UE Capability” may include “FGI bit common part”.

  In step S1009, the radio base station eNB # 2 holds “TDD unique part” received from the mobile station UE, and includes “TDD unique part” and “FGI bit common part” for the mobility management node MME. “UE Capability Info Indication” for notifying “TDD UE Capability” is transmitted.

  In Step S1010, the mobility management node MME updates “UE Capability” of the mobile station UE based on the notified “TDD UE Capability”.

  Second, referring to FIG. 6, in the mobile communication system according to the present embodiment, the mobile station UE in the idle state in the cell under the TDD radio base station eNB # 2 is in the FDD scheme. An operation when cell reselection processing is performed on a cell under radio base station eNB # 1 will be described.

  As shown in FIG. 6, in step S2001, the mobile station UE that is in a standby state in a cell (TDD network) under the TDD radio base station eNB # 2 moves to the FDD radio base station eNB # 1 in step S2002. A cell reselection process to a subordinate cell (FDD network) is performed.

  In this state, the mobility management node MME still holds “TDD UE Capability” as “UE Capability” of the mobile station UE.

  After that, when the mobile station UE needs to transition to the connected state (RRC Connected state) in the cell under the FDD radio base station eNB # 1, in step S2004, the mobile station UE notifies the mobility management node MME “ Send "Service Request".

  In step S2005, the mobility management node MME transmits “UE Initial Context Setup Request” including “Bearer Setup information” to the radio base station eNB # 1.

  Here, “UE Initial Context Setup Request” notifies “UE Radio Capability” of the mobile station UE.

  Also, the “UE Initial Context Setup Request” notifies “TDD unique part” and “FGI bit common part”.

  In step S2006, the radio base station eNB # 1 determines that the notified “TDD unique part” is not a unique part specific to the FDD scheme to which the radio base station eNB # 1 itself corresponds. In step S2007, the radio base station eNB # 1 “UE Capability Request” requesting “FDD UE Capability” including “FDD unique part” is transmitted.

  In step S2008, the mobile station UE transmits “UE Capability Information” for notifying “FDD UE Capability” including “FDD unique part” to the radio base station eNB # 1.

  Here, “FGI bit common part” may be included in “FDD UE Capability”.

  In step S2009, the radio base station eNB # 1 holds the “FDD unique part” received from the mobile station UE, and includes “FDD unique part” and “FGI bit common part” for the mobility management node MME. “UE Capability Info Indication” for notifying “FDD UE Capability” is transmitted.

  In step S2010, the mobility management node MME updates the “UE Capability” of the mobile station UE based on the notified “FDD UE Capability”.

  According to the mobile communication system according to the present embodiment, cell selection processing is performed from a cell under the radio base station eNB # 1 to a cell under the radio base station eNB # 2 in the same location registration area of the mobile station UE. In this case, since the radio base station eNB # 2 can acquire “TDD unique part” from the mobile station UE in the first “Service Request procedure” thereafter, the mobile station UE performs the detach process. Instead, it is possible to perform handover from a cell under the FDD radio base station eNB # 1 within the same location registration area to a cell under the TDD radio base station eNB # 2.

  Similarly, according to the mobile communication system according to the present embodiment, cell selection processing from a cell under radio base station eNB # 2 to a cell under radio base station eNB # 1 within the same location registration area of the mobile station UE Is performed, since the radio base station eNB # 1 can acquire “FDD unique part” from the mobile station UE in the first “Service Request procedure” thereafter, the mobile station UE performs the detach process. Without performing the handover from the cell under the TDD radio base station eNB # 2 in the same location registration area to the cell under the FDD radio base station eNB # 1.

  The characteristics of the present embodiment described above may be expressed as follows.

  A first feature of the present embodiment is a mobile communication method, in which an FGI bit set (function group instruction information indicating essential functions supported by the mobile station UE) is “FGI bit common part (FDD method and TDD). Common part) ”and“ FDD unique part / TDD unique part (unique part specific to each of FDD and TDD methods) ”, which are subordinate to radio base station eNB # 1 of FDD system After the mobile station UE in a standby state in the cell performs the cell reselection process to the cell under the TDD radio base station eNB # 2, the mobile management node MME receives a “Service Request (service request signal)”. And the mobility management node MME sends “Serv” In response to “ce Request”, a “UE Initial Context Setup Request (Signal)” including “FDD unique part” and “FGI bit common part” is transmitted to the TDD radio base station eNB # 2. The process, the TDD radio base station eNB # 2 acquires “TDD unique part” from the mobile station UE in response to the “UE Initial Context Setup Request”, and the TDD radio base station eNB # 2 And a step of notifying the mobility management node MME of “TDD unique part”.

  The second feature of the present embodiment is a mobile communication method, in which the FGI bit set of the mobile station UE is composed of “FGI bit common part” and “FDD unique part / TDD unique part”, and TDD. After the mobile station UE in the standby state in the cell under the radio base station eNB # 2 of the scheme performs the cell reselection process to the cell under the radio base station eNB # 1 of the FDD scheme, the mobile station UE In response to the “Service Request”, the process of transmitting “Service Request” and the mobility management node MME performs “TDD unique part” and “FGI bit common part” to the FDD radio base station eNB # 1. Including "UE Initial Con a step of transmitting an “ext Setup Request”, a step of the FDD radio base station eNB # 1 acquiring an “FDD unique part” from the mobile station UE in response to the “UE Initial Context Setup Request”, and an FDD scheme The gist of the present invention is that the radio base station eNB # 1 includes a step of notifying the mobility management node MME of “FDD unique part”.

  Note that the operations of the mobility management node MME, the radio base stations eNB # 1 / eNB # 2, and the mobile station UE described above may be implemented by hardware or may be implemented by a software module executed by a processor. However, it may be implemented by a combination of both.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobility management node MME, the radio base station eNB # 1 / eNB # 2, or the mobile station UE. In addition, the storage medium and the processor may be provided as a discrete component in the mobility management node MME, the radio base station eNB # 1 / eNB # 2, or the mobile station UE.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

MME ... mobility management node UE ... mobile station eNB # 1, eNB # 2 ... radio base station 11 ... management unit 12, 21 ... reception unit 13, 23 ... transmission unit 22 ... determination unit

Claims (2)

A mobile communication method,
The functional group indication information indicating the essential functions supported by the mobile station is composed of a common part common to the FDD system and the TDD system, and a unique part unique to each of the FDD system and the TDD system,
After the mobile station in the standby state in the cell under the FDD radio base station performs cell reselection processing to the cell under the TDD radio base station, a service request signal is sent to the mobility management node. Sending, and
The mobility management node, in response to the service request signal, transmitting an initial context setting request signal including a unique part unique to the FDD system and the common part to the TDD wireless base station;
The radio base station of the TDD scheme acquires a unique part specific to the TDD scheme from the mobile station in response to the initial context setting request signal;
A mobile communication method comprising: a step in which the TDD radio base station notifies the mobility management node of a unique part specific to the TDD scheme. A mobile communication method,
The functional group indication information indicating the essential functions supported by the mobile station is composed of a common part common to the FDD system and the TDD system, and a unique part unique to each of the FDD system and the TDD system,
After the mobile station in the standby state in the cell under the TDD radio base station performs cell reselection processing to the cell under the FDD radio base station, a service request signal is sent to the mobility management node. Sending, and
The mobility management node, in response to the service request signal, transmitting an initial context setting request signal including an inherent part unique to the TDD system and the common part to the FDD wireless base station;
The FDD radio base station acquires a unique part specific to the FDD scheme from the mobile station in response to the initial context setting request signal;
A mobile communication method comprising: a step in which the FDD radio base station notifies the mobility management node of a unique part specific to the FDD scheme.

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