System and method for applying extended accessing barring in wireless communication system

• US 10,123,254 B2
• Filed: 09/21/2015
• Issued: 11/06/2018
• Est. Priority Date: 08/10/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jang, Jaehyuk, Kim, Soenghun
• Primary Examiner(s): Scheibel, Robert C.
• Application Number:
  US14/859,887
• Publication Number:
  US 20160014673A1
• Time in Patent Office: 1,142 Days
• Field of Search: None
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 48/02 Access restriction performed under specific conditions
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0875 with assigned priorities based access
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A system and a method that employs Extended Access Barring (EAB) when a Machine Type Communication (MTC) device performs an attempt to access an evolved Node B (eNB) in a wireless communication system are provided. When User Equipment (UE) supporting MTC, an MTC device, performs an attempt to access a network, the system and method determines whether it can access the network and performs the access procedure. The system and method can control the operations of UE that performs an attempt to access a network, thereby preventing excessive access.

Claims

1. A method by a base station in a wireless communication system, the method comprising:

transmitting configuration information corresponding to an extended access barring (EAB);

receiving a first random access preamble from a user equipment (UE), if the EAB is not applied to the UE;

transmitting a random access response including a first type backoff and a second type back off to the UE; and

receiving a second random access preamble from the UE.

2. The method of claim 1, wherein the UE:

checks if the EAB is applied to the request for the RRC connection, whether access to a cell is barred by the EAB; and

identifies, if the access to the cell is barred by the EAB, a failure of the RRC connection.

3. The method of claim 2, wherein an access to a cell is considered as barred, if the UE belongs to a category of UEs as indicated in an EAB Category contained in an EAB parameter and if an AC of the UE belongs to a range excluding the ACs 11 to 15.

4. The method of claim 1, further comprising:

transmitting a system information block to the UE; and

wherein an access barring check is performed by the UE, if an AC barring parameter of the ACB is included in the system information block.

5. The method of claim 4, wherein the UE:

considers, if the UE has one or more ACs with a value in a first range, which is valid for the UE, access to a cell as not barred;

generates, if the UE does not have the one or more ACs with the value in the first range, a random number uniformly distributed in the range of 0 to 1; and

considers, if the random number is lower than a value indicated by the AC barring parameter, access to the cell as not barred, and considers, if the random number is not lower than the value indicated by the AC barring parameter, access to the cell as barred.

6. A base station in a wireless communication system, the base station comprising:

a transceiver configured to transmit and receive signals; and

a processor configured to;

transmit configuration information corresponding to an extended access barring (EAB),

receive a random access preamble from a user equipment (UE), if the EAB is not applied to the UE,

transmit a random access response including a first type backoff and a second type back off to the UE, and

receive a second random access preamble from the UE.

7. The base station of claim 6, wherein the processor is further configured to:

check, if the EAB is applied to the request for the RRC connection, whether access to a cell is barred by the EAB; and

identify, if the access to a cell is barred by the EAB, a failure of the RRC connection.

8. The base station of claim 7, wherein an access to a cell is considered as barred, if the UE belongs to a category of UEs as indicated in an EAB Category contained in an EAB parameter and if an AC of the UE belongs to a range excluding the ACs 11 to 15.

9. The base station of claim 6,

wherein the processor is further configured to transmit a system information block to the UE;

and

wherein an access barring check is performed by the UE, if an AC barring parameter for the ACB is included in the system information block.

10. The base station of claim 9, wherein the UE:

considers, if the UE has one or more ACs with a value in a first range, which is valid for the UE, access to a cell as not barred; and

generates, if the UE does not have the one or more ACs with the value in the first range, a random number uniformly distributed in the range of 0 to 1; and

considers, if the random number is lower than a value indicated by the AC barring parameter, access to the cell as not barred, and considers, if the random number is not lower than the value indicated by the AC barring parameter, access to the cell as barred.