Method and apparatus for controlling network access in a wireless communication system

Patent metadata

Field	Value
Publication number	US-9301324-B2
Application number	US-201214357757-A
Country	US
Kind code	B2
Filing date	Nov 13, 2012
Priority date	Nov 14, 2011
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

The present invention is directed to a method and an apparatus for use in a wireless communication system. Specifically, the present invention is directed to a method of performing random access procedure for network access and an apparatus therefore, in which the method comprises: receiving a first downlink signal including first information at time t 1 , the first information indicating a first time duration T 1 ; receiving a second downlink signal including second information at a time t 1 +b within T 1 , the second information indicating a second time duration T 2 ; and performing the random access procedure for network access, wherein if T 2 is larger than b, the random access procedure is allowed after T 2 −b has passed from t 1 +b, wherein if T 2 is equal to or less than b, the random access procedure is allowed after t 1 +b.

First claim

The invention claimed is:

1. A method of performing a random access procedure for network access at a User Equipment (UE) in a wireless communication system, the method comprising:
receiving a first downlink signal including first information at a time t 1 , the first information indicating a first time duration T 1 ;
receiving a second downlink signal including second information at a time t 1 +b within T 1 , the second information indicating a second time duration T 2 ; and
performing the random access procedure for network access,
wherein b is a time duration taken to receive the second downlink signal after t 1 ,
wherein if T 2 is larger than b, the random access procedure is allowed after T 2 −b has passed from t 1 +b,
wherein if T 2 is equal to or less than b, the random access procedure is allowed after t 1 +b.

2. The method of claim 1 , wherein the first downlink signal includes a message for rejecting a radio resource control (RRC) connection request or a message for releasing a RRC connection.

3. The method of claim 1 , wherein the first downlink signal includes a system information block, and the first information further indicates whether the random access process is allowed or barred during T 1 from t 1 .

4. The method of claim 1 , wherein the network access is for a machine type communication (MTC).

5. The method of claim 1 , wherein the UE is a delay-tolerant device.

6. A User Equipment (UE) configured to perform a random access procedure for network access in a wireless communication system, the UE comprising:
a radio frequency (RF) unit; and
a processor, wherein the processor is configured to:
receive a first downlink signal including first information at a time t 1 , the first information indicating a first time duration T 1 ,
receive a second downlink signal including second information at a time t 1 +b within T 1 , the second information indicating a second time duration T 2 , and
perform the random access procedure for network access,
wherein b is a time duration taken to receive the second downlink signal after t 1 ,
wherein if T 2 is larger than b, the random access procedure is allowed after T 2 −b has passed from t 1 +b,
wherein if T 2 is equal to or less than b, the random access procedure is allowed after t 1 +b.

7. The UE of claim 6 , wherein the first downlink signal includes a message for rejecting a radio resource control (RRC) connection request or a message for releasing a RRC connection.

8. The UE of claim 6 , wherein the first downlink signal includes a system information block, and the first information further indicates whether the random access process is allowed or barred during T 1 from t 1 .

9. The UE of claim 6 , wherein the network access is for a machine type communication (MTC).

10. The UE of claim 6 , wherein the UE is a delay-tolerant device.

11. A method of controlling a random access procedure for network access in a wireless communication system, the method comprising:
transmitting, by a Base Station (BS), a first signal to a User Equipment (UE) at a time t 1 , the first signal indicating a first time duration T 1 ;
transmitting, by the BS, a second signal to a Mobility Management Entity (MME), the second signal including identification information of the UE;
transmitting, by the BS, a third signal to the MME if the BS detects network access congestion relief, the third signal informing the network access congestion relief;
receiving, by the BS, a fourth signal from the MME, the fourth signal indicating a second time duration T 2 for the UE; and
transmitting, by the BS, a fifth signal to the UE at a time t 1 +b, the fifth signal indicating the second time duration T 2 ,
wherein b is a time duration taken to receive the second downlink signal after t 1 ,
wherein if T 2 is larger than b, the UE is allowed to perform the random access procedure after T 2 −b has passed from t 1 +b,
wherein if T 2 is equal to or less than b, the UE is allowed to perform the random access procedure after t 1 +b.

12. The method of claim 11 , wherein the first signal includes a message for rejecting a radio resource control (RRC) connection request or a message for releasing a RRC connection.

13. The method of claim 11 , wherein the first signal includes a system information block, and the first signal further indicates whether the random access process is allowed or barred during T 1 from t 1 .

14. The method of claim 11 , wherein the network access is for a machine type communication (MTC).

15. The method of claim 11 , wherein the UE is a delay-tolerant device.

16. A wireless communication system configured to control a random access procedure for network access, the wireless communication system comprising:
a User Equipment (UE);
a Base Station (BS); and
a Mobility Management Entity (MME),
wherein the BS is configured to:
transmit a first signal to a User Equipment (UE) at a time t 1 , the first signal indicating a first time duration T 1 ,
transmit a second signal to the MME, the second signal including identification information of the UE,
transmit a third signal to the MME if the BS detects network access congestion relief, the third signal informing the network access congestion relief,
receive a fourth signal from the MME, the fourth signal indicating a second time duration T 2 for the UE, and
transmit a fifth signal to the UE at a time t 1 +b, the fifth signal indicating the second time duration T 2 ,
wherein b is a time duration taken to receive the second downlink signal after t 1 ,
wherein if T 2 is larger than b, the UE is allowed to perform the random access procedure after T 2 −b has passed from t 1 +b,
wherein if T 2 is equal to or less than b, the UE is allowed to perform the random access procedure after t 1 +b.

17. The wireless communication system of claim 16 , wherein the first signal includes a message for rejecting a radio resource control (RRC) connection request or a message for releasing a RRC connection.

18. The wireless communication system of claim 16 , wherein the first signal includes a system information block, and the f first signal further indicates whether the random access process is allowed or barred during T 1 from t 1 .

19. The wireless communication system of claim 16 , wherein the network access is for a machine type communication (MTC).

20. The wireless communication system of claim 16 , wherein the UE is a delay-tolerant device.

Assignees

• Lg Electronics Inc

Inventors

• Lee Ki-Dong

Classifications

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W76/36

  for reassigning the resources associated with the released connections · CPC title

• H04W76/19

  Connection re-establishment · CPC title

• H04W76/34

  Selective release of ongoing connections · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title