TWI493990B - Method of reporting link failure - Google Patents

Method of reporting link failure Download PDF

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Publication number
TWI493990B
TWI493990B TW101110545A TW101110545A TWI493990B TW I493990 B TWI493990 B TW I493990B TW 101110545 A TW101110545 A TW 101110545A TW 101110545 A TW101110545 A TW 101110545A TW I493990 B TWI493990 B TW I493990B
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TW
Taiwan
Prior art keywords
connection
user device
base station
information
during
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TW101110545A
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Chinese (zh)
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TW201336329A (en
Inventor
Ming Dao Chuang
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Acer Inc
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Publication date
Priority to US201261602087P priority Critical
Application filed by Acer Inc filed Critical Acer Inc
Priority claimed from US13/757,858 external-priority patent/US9271169B2/en
Publication of TW201336329A publication Critical patent/TW201336329A/en
Application granted granted Critical
Publication of TWI493990B publication Critical patent/TWI493990B/en

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/10Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/30Power-based selection of communication route or path

Description

Method of returning link failure

The present invention relates to a method of returning link failures, and more particularly to a method of rewarding link failures to optimize actions in minimizing drive tests.

The 3rd Generation Partnership Project (3GPP) has developed the Universal Mobile Telecommunications System (UMTS), which uses Wideband Code Division Multiple Access (WCDMA). The wireless access method is characterized by providing high spectrum utilization efficiency, high coverage, high quality and high rate of multimedia data transmission. The universal terrestrial radio access network (UTRAN) in the universal mobile telecommunications system can be regarded as a wireless access network, in which the network side includes a plurality of base stations (Node-B, NB), It communicates with a plurality of user equipments (User Equipments, UEs) at the user end. In addition, in order to improve the general mobile telecommunications system, 3GPP further develops a Long Term Evolution (LTE) system to meet the increasing demands of users. The Long Term Evolution (LTE) system is considered to provide a new wireless interface and wireless network architecture that provides high data transfer rates, low latency, packet optimization, and improved system capacity and coverage, including a number of evolved base stations (evolved Nodes). -E, LTE, Evolved Universal Terrestrial Radio Access Network (E-UTRAN), which is used to communicate with the UE on the one hand, and to handle non-processing on the other hand. The Core Network (CN) controlled by the Non-Access Stratum (NAS) communicates, and the core network includes a Serving Gateway and a Mobility Management Entity (MME). Device.

In order to enable the user to receive services without being affected by the disconnection or severe signal attenuation, the wireless communication system needs to properly deploy the base station to provide seamless coverage of the user terminal and good quality. Therefore, the operator of the wireless communication system must spend considerable manpower and material resources to perform the quality measurement of the base station's signal products. Before the base station is deployed, the measurement results can be optimized and planned. There are many ways to perform measurements, such as measuring the strength and/or quality of signals at different times and locations. A more economical approach is to perform measurements by the user in the wireless communication system and to return the measurement results to the base station to provide the measurement results required by the operator. In other words, when a large number of clients perform measurement and return measurement results to the base station, the operator can use these measurement results to optimize and plan the base station deployment, thereby reducing the measurement requirements. Human and material resources. Therefore, the minimization of drive test (MDT) is defined in the 3GPP specification, and its main purpose is to perform coverage optimization, mobility optimization, and capacity optimization (capacity). Optimization), and quality of service (QoS) verification. The complete communication specification requires many people to discuss, formulate and continually modify for a long time, and the existing 3GPP specifications have not yet involved the optimization of MDT actions for LTE systems.

The present invention provides a method for returning a connection failure, comprising: re-establishing a second connection between a user device and a base station after a first connection interruption; the user device reporting that the first connection period One of the user devices transmits action information to the base station; and the base station performs an action optimization in a minimized drive test based on the action information.

Handover refers to a process of transferring the management rights of a user device from an existing source serving cell to a target cell, so that the mobile user device can maintain the ongoing data. Or a communication link. According to the 3GPP specifications, the handover procedure can be divided into four major steps:

(1) The user device transmits a measurement report, and the source base station determines whether to initiate the handover procedure of the user device.

(2) The user equipment receives the Radio Resource Control Connection Reconfiguration (RRC Connection Reconfiguration) that is returned by the target base station to prepare for the handover procedure.

(3) The user equipment performs a Random Access Channel (RACH) procedure to obtain uplink synchronization for the target base station.

(4) After the synchronization is completed, the user device transmits a message to complete the RRC connection reconfiguration.

For a user device and a base station in a wireless communication system, the present invention provides a method for returning a connection failure, which can be optimized in the MDT. In the present invention, the wireless communication system can be a general mobile telecommunication system or a long term evolution system, which is simply composed of a network end and a user end. In a general mobile telecommunications system, the network side can be a universal terrestrial global wireless access network, which can include a plurality of base stations. In a long term evolution system, the network may be an evolved universal terrestrial global radio access network, which may include a plurality of evolved base stations. The client can be one or more user devices such as a mobile phone, a notebook computer, a tablet computer, an e-book, and a portable computer system. However, the above is only an embodiment of the present invention and does not limit the scope of the present invention.

The flowchart of Fig. 1 illustrates a method for returning a link failure in the present invention, which comprises the following steps:

Step 110: After a first connection is interrupted, a second connection is re-established between a user device and a base station; and step 120 is performed.

Step 120: The user device reports the action information of the user device during the first connection, and step 130 is performed.

Step 130: Determine whether an RRC connection reconfiguration is received during the first connection: if yes, go to step 140; if no, go to step 150.

Step 140: The user device reports that one of the first information is reconfigured in relation to transmitting or receiving the RRC connection during the first connection: step 160 is performed.

Step 150: The user device reports a second information related to a Radio Link Failure (RLF) during the first connection: Step 160 is performed.

Step 160: The base station performs action optimization in the MDT according to the information reported by the user equipment.

In step 110, the first connection interruption may be due to handover failure or wireless connection failure. During the handover procedure, the base station will over-configure the RRC connection to the user device using over-the-air (OTA) technology. If the base station sends the RRC connection reconfiguration too late (for example, because the location or speed of the user device itself changes), the user device will not be able to complete the RACH procedure within the predetermined time to obtain the uplink synchronization. Will cause the delivery to fail. On the other hand, if the background environment changes and interferes with signal transmission, the user equipment may not be able to successfully receive the RRC connection reconfiguration sent by the base station, thereby causing the wireless connection to fail. Thus, after the first link is broken, the present invention re-establishes a second link between the user device and the base station.

In step 120, after the second connection is successfully established, the user device reports the action information of the user device during the first connection. In an embodiment of the present invention, the action information may measure one of the user device action states during the first connection period, a user device action state change, or one of the user device speeds when the user device action state changes. .

For the embodiment of the user device action state, the user equipment can measure the reference signal received power (RSRP) or the reference signal receiving quality of the source base station and the target base station during the first connection period (Reference Signal Received) Quality, RSRQ), and based on the number of cell re-selections within a predetermined time period, the action information is determined to be a high-mobility state, a medium-mobility state, or a low Low-mobility state.

In an embodiment of the change in the state of action of the user device, the user device may measure a change in position or a change in timing of the action state during the first connection. For example, through standalone Global System (GPS) / Global Navigation Satellite System (GNSS), assisted GPS (assisted GPS) / assisted global navigation satellite system (assisted GNSS), location services (Location Services, LCS) positioning, or Secure User Plane Location (SUPL) positioning, etc., to measure the change in position of the user device's action state during the first connection. Or measuring the number of Single-Frequency Network (SFN) transmissions or the number of orthogonal frequency-division multiplexing (OFDM) during the first connection to obtain the timing of the action state of the user equipment. Variety.

For an embodiment of the user device speed when the user device changes in behavior, the user device can pass through an independent global positioning system/global navigation satellite system, an assisted global positioning system/assisted global navigation satellite system, a location service location, or a secure user plane. Techniques such as position location to measure user device speed during the first connection.

In step 130, the user device determines whether an RRC connection reconfiguration is received during the first connection. If the RRC connection is reconfigured, the first connection is interrupted because the handover failed, and the present invention proceeds to step 140; if the RRC connection is not received, the first connection is interrupted because the wireless connection fails. The invention then proceeds to step 150.

According to the 3GPP specifications, the RRC connection reconfigures the mobility control information (mobilityControlInfo) required for the handover procedure, such as the Cell Radio Network Temporary Identifier ( C-RNTI), and the security operation of the target base station. Parameters such as security algorithm identifier and system information block (SIB), RACH preamble. The base station will transmit the RRC link reconfiguration with a specific RACH power. After receiving the RRC connection reconfiguration, the user equipment starts a timer T304 and stops the timer T304 after synchronizing to the target base station through the RACH.

In step 140, the user device reports the first information associated with transmitting or receiving the RRC connection reconfiguration during the first connection. In an embodiment of the present invention, the user device may report the start/expiration timing of the counter T304 in step 140, the location or speed of the user device when the counter T304 starts/expires, or the network side transmits the RRC connection regroup. One of the maximum RACH powers. However, the above is only an embodiment of the present invention and does not limit the scope of the present invention.

According to the 3GPP specifications, a Wireless Transmit/Received Unit (WTRU) monitors the connection between the user equipment and the base station and performs a repair procedure when it is determined that the wireless connection fails. The wireless transceiver unit can monitor a specific transmission carrier and detect an in-sync indication and an out-of-sync indication. After receiving a predetermined number of signal out-of-synchronization indications, the counter T310 is activated. If a predetermined number of signal synchronization indications are not received before the timer T310 expires, it is determined that the wireless connection has failed. On the other hand, when the Media Access Control (MAC) informs that a random read problem occurs, or the Radio Link Control (RCL) informs that the number of retransmissions has reached the upper limit, the wireless connection is also determined at this time. failure.

In step 150, the user device will report the second information related to the failure of the wireless connection during the first connection. In an embodiment of the invention, the user device may report the start/expiration timing of the counter T310, the MAC issue, or the RLC issue. However, the above is only an embodiment of the present invention and does not limit the scope of the present invention.

In step 160, the base station may perform action optimization in the MDT according to the information reported by the user equipment, for example, adjusting network parameters for an area with insufficient coverage, or adjusting transmission for different action states of the user equipment. The time of the RRC link reconfiguration.

In the present invention, after the previous connection is interrupted, if a new connection can be re-established between the user device and the base station, the user device will report the information related to the failure of the previous connection to the base station, for example, the reward is in the previous time. Action information of the user device during the connection, information related to the transmission or reception of the RRC connection reconfiguration, or information related to the failure of the wireless connection. Therefore, the base station can provide action optimization for the MDT, thereby improving the handover success rate and the overall efficiency of the network.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

110~160. . . step

Figure 1 is a flow chart of a method for returning a link failure in the present invention.

110~160. . . step

Claims (10)

  1. A method for reporting a connection failure, comprising: re-establishing a second connection between a user device and a base station after a first connection is interrupted; the user device reporting the user during the first connection One of the device actions information to the base station; when it is determined that a RRC connection reconfiguration is not received during the first connection, the user device reports a failure in relation to a wireless link during the first connection ( Radio Link Failure (RLF), a second information; and the base station performs an action optimization in a minimization of drive test (MDT) based on the action information and the second information ).
  2. The method of claim 1, wherein the action information comprises measuring one of a user device action state, a user device action state change during the first link, or when the user device action state changes A user device speed.
  3. The method of claim 2, further comprising: measuring a reference signal receiving energy of a source base station and a target base station during the first connection period (Reference Signal Received Power, RSRP) or a Reference Signal Received Quality (RSRQ); and determining the action information to be a high action state based on the number of cell re-selections within a predetermined time period (high- Mobility state), a medium-mobility state or a low-mobility state.
  4. The method of claim 2, further comprising: through a standalone Global Positioning System (GPS), an independent Global Navigation Satellite System (GNSS), and an assisted global positioning system. (assisted GPS), an assisted global navigation satellite system (assisted GNSS), a location service (LCS) location, or a Secure User Plane Location (SUPL) location during the first link period A change in position of the mobile device is measured to provide a change in the operational state of the user device.
  5. The method of claim 2, further comprising: measuring a single-frequency network (SFN) transmission number or an orthogonal frequency-division multiplexing during the first connection period (orthogonal frequency-division multiplexing) , The OFDM is counted to obtain a timing change of the mobile device to provide a change in the operational state of the user device.
  6. The method of claim 2, further comprising: transmitting through an independent global positioning system, an independent global navigation satellite system, an auxiliary global positioning system, an auxiliary global navigation satellite system, a location service positioning, or a secure user plane Positioning to obtain the user device speed.
  7. The method of claim 1, further comprising: when determining that a Radio Resource Control Connection Reconfiguration (RRC Connection Reconfiguration) is received during the first connection, the user device returns The first link period reconfigures one of the first information related to transmitting or receiving the RRC control link, wherein the base station further performs the action optimization in the minimized drive test according to the first information.
  8. The method of claim 7, wherein the first information includes a start/expiration timing of a counter T304, a location or a speed of the user device when the counter T304 starts/expires, or transmits the RRC connection Reconfigure one of the largest random access channel (RACH) power.
  9. The method of claim 1, wherein the second information comprises a start/expire timing of a counter T310, a Media Access Control (MAC) problem, or a Radio Link Control (RLC) control. )problem.
  10. A method for reporting a connection failure, comprising: re-establishing a second connection between a user device and a base station after a first connection is interrupted; the user device reporting the user during the first connection Transmitting one of the devices to the base station; and when determining to receive a RRC reconfiguration during the first connection, the user device reports that the radio resource control is transmitted or received during the first connection The link reconfigures one of the first information; and the base station provides an action optimization in a minimized drive test based on the action information and the first information.
TW101110545A 2012-02-23 2012-03-27 Method of reporting link failure TWI493990B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US201261602087P true 2012-02-23 2012-02-23

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/757,858 US9271169B2 (en) 2012-02-23 2013-02-04 Method of reporting link failure
US14/869,978 US20160021696A1 (en) 2012-02-23 2015-09-29 Method of reporting link failure

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TWI493990B true TWI493990B (en) 2015-07-21

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110201279A1 (en) * 2010-02-12 2011-08-18 Takashi Suzuki Methods and apparatus to perform measurements
EP2360960A2 (en) * 2010-02-12 2011-08-24 Research In Motion Limited Methods and apparatus to perform measurements
WO2011138494A1 (en) * 2010-05-06 2011-11-10 Nokia Corporation Apparatus and method to control the collection of measurement data in a communication system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8391887B2 (en) * 2010-08-13 2013-03-05 Research In Motion Limited Methods and apparatus to activate location measurements

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110201279A1 (en) * 2010-02-12 2011-08-18 Takashi Suzuki Methods and apparatus to perform measurements
EP2360960A2 (en) * 2010-02-12 2011-08-24 Research In Motion Limited Methods and apparatus to perform measurements
WO2011138494A1 (en) * 2010-05-06 2011-11-10 Nokia Corporation Apparatus and method to control the collection of measurement data in a communication system

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TW201336329A (en) 2013-09-01
CN103298025B (en) 2016-05-25

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