Method and device for receiving a multimedia broadcast multicast service in a mobile communication system

• US 9,155,069 B2
• Filed: 04/01/2014
• Issued: 10/06/2015
• Est. Priority Date: 10/10/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Soeng-Hun, Jeong, Kyeong-In
• Primary Examiner(s): CHO, HONG SOL
• Application Number:
  US14/242,259
• Publication Number:
  US 20140211685A1
• Time in Patent Office: 553 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 12/1881 with schedule organisation, e.g. priority, sequence management
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04W 36/0007 for multicast or broadcast services, e.g. MBMS multicast or broadcast application services H04W4/06; resource management for broadcast services H04W72/30; connection management for selective distribution or broadcast H04W76/40
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• CPC Class Codes: H04W 4/023 using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

The present invention relates to a method and device for receiving a multimedia broadcast multicast service (MBMS) in a mobile communication system. The method for receiving the MBMS of a terminal in the mobile communication system according to an embodiment of the present invention is characterized in that it includes: determining whether service area ID (SAI) information on a serving cell is broadcast during the MBMS; receiving the SAI information on the serving cell when it is determined that the SAI information is broadcast; determining, by using the received SAI information of the serving cell, whether an SAI of the MBMS matches the SAI of the serving cell; and changing the cell reselection priority of the frequency of the serving cell to the highest priority if it is determined that the SAI of the MBMS matches the SAI of the serving cell. According to the present invention, it is possible to efficiently receive MBMS services by enabling a terminal to select a proper frequency or cell when an MBMS service of interest starts.

Claims

1. A method for a random access of a secondary cell in a mobile communication system using Carrier Aggregation (CA), the method comprising:

receiving, by a terminal, a Random Access Response (RAR) window size indicating duration of a random access response window for receiving a random access response on a primary cell via system information;

receiving, by the terminal, a maximum number of preamble transmission values for the random access of the secondary cell on a primary cell via dedicated control information;

transmitting, by the terminal, a random access preamble for the random access of the secondary cell; and

monitoring, by the terminal, a RAR based on the RAR window size.

2. The method of the claim 1, wherein the transmitting the random access preamble is based on the maximum number of preamble transmission values.

3. The method of the claim 1, wherein the transmitting the random access preamble further comprises:

increasing a preamble transmission counter by one.

4. The method of the claim 1, wherein the transmitting the random access preamble further comprises:

increasing a preamble transmission counter by one if the random access response is not received within the random access response window.

5. The method of claim 4, wherein the method further comprising:

stopping the random access of the secondary cell if the preamble transmission counter is greater than the maximum number of preamble transmission values.

6. A terminal for a random access of a secondary cell in a mobile communication system using Carrier Aggregation (CA), the terminal comprising:

a transceiver configured to transmit and receive a signal; and

a controller configured to receive a Random Access Response (RAR) window size indicating duration of a random access response window for receiving a random access response on a primary cell via system information, to receive a maximum number of preamble transmission values for the random access of the secondary cell on a primary cell via dedicated control information, to transmit a random access preamble for the random access of the secondary cell, and to monitor a RAR based on the RAR window size.

7. The terminal of the claim 6, wherein the controller is configured to transmit the random access preamble based on the maximum number of preamble transmission values.

8. The terminal of the claim 6, wherein the controller is configured to increase a preamble transmission counter by one.

9. The terminal of the claim 6, wherein the controller configured to increase a preamble transmission counter by one if the random access response is not received within the random access response window.

10. The terminal of claim 9, wherein the controller is configured to stop the random access of the secondary cell if the preamble transmission counter is greater than the maximum number of preamble transmission values.

11. A base station for a random access of a secondary cell in a mobile communication system using Carrier Aggregation (CA), the base station comprising:

a transceiver configured to transmit and receive a signal; and

a controller configured to transmit a Random Access Response (RAR) window size indicating duration of a random access response window for a terminal to receive a random access response on a primary cell via system information, to transmit a maximum number of preamble transmission values for the random access of the secondary cell on a primary cell via dedicated control information, and to receive a random access preamble for the random access of the secondary cell.

12. The base station of the claim 11, wherein the random access preamble is transmitted based on the maximum number of preamble transmission values, by the terminal.

13. The base station of the claim 11, wherein a preamble transmission counter is increased by one.

14. The base station of the claim 11, wherein a preamble transmission counter is increased by one if the random access response is not received within the random access response window by the terminal.

15. The base station of claim 14, wherein the random access of the secondary cell is stopped if the preamble transmission counter is greater than the maximum number of preamble transmission values.