# US 9,521,596 B2 · Mobile communication device for collecting system information and cell measurement using DRX gap and autonomous gap

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- Number: US 9,521,596 B2
- Document ID: US9521596B2
- Status: Granted
- Kind: B2
- Application number: 14/391,477
- Filed: 2013-05-17
- Published: 2015-04-30
- Granted: 2016-12-13
- Earliest claimed: 2012-05-17
- Assignees: Mediatek Inc.
- Applicants: MediaTek Inc.
- Inventors: Yi-Chun Wei; Yi-Yo Lin; Hung-Wei Shih
- Web page: https://patentgrep.com/patent/US9521596B2

## CPC

- H04W 36/0088: {Scheduling hand-off measurements}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 36/0072: {of resource information of target access point}
- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04W 36/249: {according to timing information}
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A mobile communication device and a method thereof are provided. The method, adopted by a mobile communication device connected to a serving cell, including: receiving a measurement request for a first target cell; in response to the measurement request, acquiring first timing information of first system information for a first target cell; scheduling an autonomous gap substantially corresponding to occurrence of the first system information according to the first timing information; and initiating the autonomous gap to receive the first system information from the first target cell.

## Claims

### Claim 1

A method adopted by a mobile communication device connected to a serving cell, comprising:
receiving a first measurement request for a first target cell;
receiving a second measurement request for a second target cell;
in response to the first measurement request, taking measurements for the first target cells in first frequencies;
in response to the second measurement request, taking measurements for the second target cells in second frequencies;
wherein the first and second frequencies are proportional to first and second numbers of frequencies adopted by the first and second target cells, respectively,
in response to the first measurement request, acquiring first timing information of first system information for the first target cell;
scheduling an autonomous gap corresponding to occurrence of the first system information according to the first timing information; and
initiating the autonomous gap to receive the first system information from the first target cell;
determining whether occurrence of the first system information coincides with a portion of a DRX gap; and
wherein when system information for the first and second target cells are absent from the portion of the DRX gap, taking measurements for the first and second target cells in a priority order;
when the occurrence of the first system information coincides with the portion of the DRX gap, receiving the first system information in the portion of the DRX gap.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
when the first system information for the first target cell is absent from the portion of the DRX gap, taking measurements for the first target cell in the portion of the DRX gap.

### Claim 3 (depends on 1)

The method of claim 1, wherein the system information includes Master Information Block (MIB) and System Information Block (SIB).

### Claim 4 (depends on 1)

The method of claim 1, wherein a length of the autonomous gap is less than 5 subframes.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
determining a channel condition of the established connection;
wherein the initiating step comprises initiating the autonomous gap based on the channel condition of the established connection.

### Claim 6 (depends on 5)

The method of claim 5, wherein the initiating step comprises determining whether the channel condition of the established connection is less than a predetermined channel condition.

### Claim 7

A mobile communication device, comprising:
a transceiver, configured to establish a connection to a serving cell, receive a measurement request for a first target cell, and receive a second measurement request for a second target cell, and wherein the transceiver is configured to take measurements for the first and second target cells in first and second frequencies, respectively; and wherein the first and second frequencies are proportional to first and second numbers of frequencies adopted by the first and second target cells, respectively; and
a controller, coupled to the transceiver, configured to in response to the measurement request, acquire first timing information of first system information for a first target cell, schedule an autonomous gap corresponding to occurrence of the first system information according to the first timing information, and initiate the autonomous gap to receive the first system information from the first target cell, and;
wherein when the first system information is absent from the portion of the DRX gap, the transceiver is configured to take measurements for the first and second target cells in a priority order;
wherein the controller is further configured to determine whether the occurrence of the first system information coincides with a portion of a DRX gap; and
when the occurrence of the first system information coincides with the portion of the DRX gap, the transceiver is configured to receive the first system information in the portion of the DRX gap.

### Claim 8 (depends on 7)

The mobile communication device of claim 7, wherein:
when the first system information is absent from the portion of the DRX gap, the transceiver is configured to take measurements for the first target cell in the portion of the DRX gap.

### Claim 9 (depends on 7)

The mobile communication device of claim 7, wherein the system information includes Master Information Block (MIB) and System Information Block (SIB).

### Claim 10 (depends on 7)

The mobile communication device of claim 7, wherein a length of the autonomous gap is less than 5 subframes.

### Claim 11 (depends on 7)

The mobile communication device of claim 7, wherein:
the controller is further configured to determine a channel condition of the established connection; and
the controller is configured to initiate the autonomous gap based on the channel condition of the established connection.

### Claim 12 (depends on 11)

The mobile communication device of claim 11, wherein the controller is configured to determine whether the channel condition of the established connection is less than a predetermined channel condition.

### Claim 13 (depends on 7)

The mobile communication device of claim 7, wherein the priority order is a round robin order.