METHOD AND APPARATUS FOR PERFORMING RADIO ACCESS WITH DELAY IN A WIRELESS COMMUNICATION SYSTEM

• US 20120269122A1
• Filed: 04/20/2012
• Published: 10/25/2012
• Est. Priority Date: 04/21/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Ki Dong
• Granted Patent: US 8,811,244 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 48/14 using user query or user detection
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 76/18 Management of setup rejection or failure
• CPC Class Codes: H04W 76/36 for reassigning the resources associated with the released connections

Abstract

In one design, a method to change a network-assigning mechanism and to use a distributed UE-selecting mechanism with the minimum possible information transferred from the network to the UE is proposed. In particular, it provides mechanism to define a lower bound and an upper bound for the extended wait time. For instance, the method comprises transmitting a RRC connection request message to a network, wherein an establishment cause of the RRC connection request message is set to be delay tolerant or low priority; receiving information associated with a first wait time included in an RRC connection reject/release message from the network; and performing a radio access to the network with a delay which is determined based on a lower bound of the first wait time and a upper bound of the first wait time.

Claims

1. A method of performing a radio access procedure in a wireless communication system using a number of orthogonal frequency division multiple (OFDM) symbols, the method performed by a user equipment (UE) and comprising:

transmitting a radio resource control (RRC) connection request message to a network, wherein an establishment cause of the RRC connection request message is set to be delay tolerant or low priority;

receiving information associated with a first wait time included in an RRC connection reject message or an RRC connection release message from the network; and

performing a radio access to the network with a delay which is determined based on a lower bound of the first wait time and a upper bound of the first wait time,

wherein the lower bound of the first wait time and the upper bound of the first wait time are indicated by the information on the first wait time.

2. The method of claim 1, wherein the delay is determined to be an integer value drawn from a uniform distribution between the lower bound and the upper bound.

3. The method of claim 1, wherein the integer value is transmitted from an RRC of the UE to a non-access stratum (NAS) of the UE to determine a mobility management back-off timer value.

4. The method of claim 1, wherein the information associated with the first wait time includes a first data field and a second data field, wherein the upper bound is indicated by the first data field and the lower bound is determined using a multiplication between a first value indicated by the first data field and a second value indicated by the second data field.

5. The method of claim 1, wherein the information associated with the first wait time consists of most significant bits (MSBs) and least significant bits (LSBs), wherein the MSBs consist of consecutive bits representing the upper bound, and the LSBs consist of consecutive bits representing a fraction, wherein the fraction is used to determine the lower bound.

6. The method of claim 1, wherein the step of performing the radio access to the network includes performing an access class (AC) barring procedure to a base station.

7. The method of claim 6, wherein the AC barring procedure is performed after a timer is running, wherein a time value for the timer is a random number drawn from a uniform distribution between the upper bound and the lower bound.

8. The method of claim 1, wherein a second wait time is further included in the RRC connection reject message or the RRC connection release message.

9. The method of claim 8, wherein the first wait time is an extended wait time and the second wait time is a wait time.

10. A method of performing a radio access procedure in a wireless communication system using a number of orthogonal frequency division multiple (OFDM) symbols, the method performed by a user equipment (UE) and comprising:

transmitting a radio resource control (RRC) connection request message to a network, wherein an establishment cause of the RRC connection request message is set to be delay tolerant or low priority;

in response to the RRC connection request message, receiving an RRC connection reject message from the network including first information associated with an extended wait time, wherein the first information includes a first portion and a second portion;

determining a lower bound for the extended wait time and an upper bound for the extended wait time by using the first information associated with the extended wait time;

drawing a random number from a uniform distribution between the lower bound and the upper bound for the extended wait time;

starting an extended wait timer according to the drawn number; and

performing an access class (AC) barring procedure after the extended wait timer is expired.

11. The method of claim 10, wherein second information associated with a wait time is further included in the RRC connection reject message.

12. The method of claim 11, further comprising:

starting a wait timer according to the wait time before starting the extended wait timer.

13. The method of claim 10, wherein the random number is transmitted from an RRC of the UE to a non-access stratum (NAS) of the UE to determine a mobility management back-off timer value.

14. The method of claim 10, wherein the first information associated with the extended wait time consists of most significant bits (MSBs) and least significant bits (LSBs), wherein the MSBs consist of consecutive bits representing the upper bound, and the LSBs consist of consecutive bits representing a fraction, wherein the fraction is used to determine the lower bound.

15. A method of performing a radio access procedure in a wireless communication system using a number of orthogonal frequency division multiple (OFDM) symbols, the method performed by a user equipment (UE) and comprising:

establishing a radio resource control (RRC) connection to a network, wherein an establishment cause of the RRC connection is set to be delay tolerant or low priority;

receiving an RRC connection release message from the network including first information associated with an extended wait time, wherein the first information includes a first portion and a second portion;

determining a lower bound for the extended wait time and an upper bound for the extended wait time by using the first information associated with the extended wait time;

drawing a random number from a uniform distribution between the lower bound and the upper bound for the extended wait time;

starting an extended wait timer according to the drawn number; and

performing an access class (AC) barring procedure after the extended wait timer is expired.