METHOD OF REPORTING LINK FAILURE

• US 20130223205A1
• Filed: 02/04/2013
• Published: 08/29/2013
• Est. Priority Date: 02/23/2012
• Status: Active Grant

• Current Assignee: Acer, Inc.
• Original Assignee: Acer, Inc.
• Inventors: Chuang, Ming-Dao
• Granted Patent: US 9,271,169 B2
• Time in Patent Office: Days
• US Class Current: 370/225
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 36/322 by location data
• CPC Class Codes: H04W 36/324 by mobility data, e.g. speed data
• CPC Class Codes: H04W 48/04 based on user or terminal location or mobility data, e.g. moving direction, speed
• CPC Class Codes: H04W 76/18 Management of setup rejection or failure

Abstract

If a new link is established between a user equipment and a serving base station after a previous link failure, the user equipment is configured to report information associated with the previous link failure, including UE mobility information during the previous link, information related to transmitting/receiving the RRC connection reconfiguration, or information related to radio link failure. The serving base station is configured to perform mobility optimization in the minimization of drive test accordingly for improving handover success rate and overall network efficiency.

Claims

1. A method of reporting link failure, comprising:

establishing a second link between a user equipment (UE) and a base station after a first link fails;

the user equipment reporting a mobility information of the user equipment during the first link to the base station; and

the base station performing a minimization of drive test (MDT) mobility optimization according to the mobility information.

2. The method of claim 1, wherein the mobility information includes a user equipment mobility state, a change in the user equipment mobility state, a user equipment mobility speed when the user equipment mobility state changes which are measured during the first link.

3. The method of claim 2, further comprising:

measuring a reference signal received power (RSRP) or a reference signal received quality (RSRQ) of a serving base station and a target base station during the first link; and

determining that the mobility information indicates a high-mobility state, a medium-mobility state or a low-mobility state according to how many times a cell re-selection occurs during a predetermined period.

4. The method of claim 2, further comprising:

providing the change in the user equipment mobility state by measuring a location change of the user equipment during the first link using a standalone global positioning system GPS, a standalone global navigation satellite system (GNSS), an assisted GPS, an assisted GNSS, a location services (LCS) orientation, or a secure user plane location (SUPL) orientation.

5. The method of claim 2, further comprising:

providing the change in the user equipment mobility state based on a timing change of the user equipment which is acquired by measuring transmission times of a single-frequency network (SFN) or an orthogonal frequency-division multiplexing (OFDM) during the first link.

6. The method of claim 2, further comprising:

acquiring the user equipment speed using a standalone GPS, a standalone GNSS, an assisted GPS, an assisted GNSS, an LCS orientation, or an SUPL orientation.

7. The method of claim 1, further comprising:

when determining that a radio resource control (RRC) connection reconfiguration is received during the first link, the user equipment reporting first information associated with transmitting or receiving the RRC connection reconfiguration during the first link, wherein the base station is configured to perform the MDT mobility optimization further according to the first information.

8. The method of claim 7, wherein the first information includes:

a start time of a timer T304 defined in a corresponding 3GPP (the 3rd Generation Partnership Project, 3GPP) specification;

an expire time of the timer T304;

a location or a speed of the user equipment when the timer T304 starts;

a location or a speed of the user equipment when the timer T304 expires;

or

a maximum random access channel (RACH) power used to transmit the RRC connection reconfiguration.

9. The method of claim 1, further comprising:

when determining that an RRC connection reconfiguration is not received during the first link, the user equipment reporting second information associated with a radio link failure (RLF) during the first link, wherein the base station is configured to perform the MDT mobility optimization further according to the second information.

10. The method of claim 9, wherein the first information includes a start time of a timer T310 defined in a corresponding 3GPP specification, an expire time of the timer T310, a media access control (MAC) problem, or a radio link control (RCL) problem.

11. The method of claim 1, further comprising:

when determining that a radio resource control (RRC) connection reconfiguration is received during the first link, the user equipment reporting first information associated with transmitting or receiving the RRC connection reconfiguration during the first link; and

when determining that the RRC connection reconfiguration is not received during the first link, the user equipment reporting second information associated with a radio link failure during the first link, wherein the base station is configured to perform the MDT mobility optimization further according to the first information and the second information.