Apparatus and method for random access channel transmission considering reverse channel status in wireless communication system

• US 9,380,543 B2
• Filed: 10/22/2010
• Issued: 06/28/2016
• Est. Priority Date: 10/22/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Moon, Hi-Chan
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): MUSA, ABDELNABI O
• Application Number:
  US12/925,520
• Publication Number:
  US 20110096686A1
• Time in Patent Office: 2,076 Days
• Field of Search: 370/335, 370/336, 370/337
• US Class Current: 1/1
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

An apparatus is capable of transmitting a signal through a Random Access Channel in a wireless communication system. The method of transmitting a signal through a random access channel includes estimating a reverse channel status using a signal received through a forward link, determining whether to transmit a signal through a random access channel in consideration of the reverse channel status, and transmitting a signal through the random access channel when it is determined to transmit a signal through the random access channel.

Claims

1. A method of transmitting a signal through a Random Access Channel by a remote node of a wireless communication system, the method comprising:

estimating a reverse channel status using a first signal received through a forward link;

identifying a reference value for determining to transmit a second signal through the random access channel based on the estimated reverse channel status;

determining whether to transmit the second signal through the random access channel by comparing the reverse channel status to the reference value;

transmitting the second signal through the random access channel if the reverse channel status is greater than the reference value; and

suspending transmission of the second signal through the random access channel if the reverse channel status is not greater than the reference value.

2. The method of claim 1, wherein estimating the reverse channel status comprises:

estimating the reverse channel status using at least one of a power level of a signal received through a forward link, a path attenuation of a signal received through a forward link, a Signal to Noise Ratio (SNR) of a reception signal through a forward link, and a forward channel gain.

3. The method of claim 1, wherein estimating the reverse channel status comprises:

calculating a fading value of a reverse channel using a power level of a signal received through a forward link.

4. The method of claim 1 further comprising:

receiving at least one reference value provided from a host node.

5. The method of claim 4 further comprising:

selecting one reference value by considering at least one of a service quality of service and statistic characteristics of a channel when at least two reference values are provided from the host node.

6. The method of claim 4 further comprising:

selecting one reference value by considering at least one of a delay time of the random access channel and statistic characteristics of a channel when at least two reference values are provided from the host node.

7. The method of claim 1 further comprising:

identifying the reference value using at least one of a service quality of service and statistic characteristics of a channel.

8. The method of claim 1 further comprising:

identifying the reference value using at least one of a delay time of the random access channel and statistic characteristics of a channel.

9. The method of claim 1, wherein transmitting the second signal through the random access channel comprises:

determining a transmission power based on a reverse channel gain in response to determining to transmit the second signal through the random access channel; and

transmitting the second signal through the random access channel using the determined transmission power.

10. The method of claim 9, wherein determining the transmission power comprises:

determining the transmission power based on propagation attenuation and an instantaneous reverse channel gain.

11. A remote node apparatus configured to transmit a signal through a Random Access Channel, the remote node apparatus comprising:

a reception device configured to receive a first signal;

a channel estimation unit configured to estimate a reverse channel status using the first signal received through a forward link at the reception device;

a control unit configured to identify a reference value for determining to transmit a second signal through the random access channel based on the estimated reverse channel status; and

determine whether to transmit the second signal through the random access channel by comparing the reverse channel status to the reference value; and

a transmission device configured to transmit the second signal through the random access channel if the reverse channel status is greater than the reference value; and

suspend transmission of the second signal through the random access channel if the reverse channel status is not greater than the reference value.

12. The remote node apparatus of claim 11, wherein the channel estimation unit is configured to estimate a reverse channel status using at least one of a power level of a signal received through a forward link, a path attenuation of a signal received through a forward link, a Signal to Noise Ratio (SNR) of a reception signal through a forward link, and a forward channel gain.

13. The remote node apparatus of claim 11, wherein the channel estimation unit is configured to calculate a fading value of a reverse channel using a power level of a signal received through a forward link.

14. The remote node apparatus of claim 11 further comprising:

a reception device configured to receive at least one reference value from a host node.

15. The remote node apparatus of claim 14, wherein the control unit is configured to select one reference value by considering at least one of a delay time of the random access channel and statistic characteristics of a channel when at least two reference values are provided from the host node.

16. The remote node apparatus of claim 14, wherein the control unit is configured to select one reference value by considering at least one of a delay time of the random access channel and statistic characteristics of a channel when at least two reference values are provided from the host node.

17. The remote node apparatus of claim 11, wherein the control unit is configured to identify the reference value using at least one of a service quality of service value and statistic characteristics of a channel.

18. The remote node apparatus of claim 11, wherein the control unit is configured to identify the reference value using at least one of a delay time of the random access channel and statistic characteristics of a channel.

19. The remote node apparatus of claim 11, further comprising:

a power control unit configured to determine transmission power based on a reverse channel gain in response to the determination to transmit the second signal through the random access channel,

wherein the transmission device is configured to transmit the second signal through the random access channel using transmission power determined at the power control unit.

20. The remote node apparatus of claim 19, wherein the power control unit is configured to determine the transmission power based on propagation attenuation and an instantaneous reverse channel gain.