Apparatus and method for ramdom access channel transmission in wireless communication system

• US 20110096686A1
• Filed: 10/22/2010
• Published: 04/28/2011
• 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
• Granted Patent: US 9,380,543 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• 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 in a remote node of a wireless communication system using a Time Division Duplex mode, the method comprising:

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.

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

estimating 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.

3. The method of claim 1, wherein the estimating of a 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, wherein the determining of whether to transmit a signal through a random access channel comprises:

determining a reference value provided from a host node for determining whether to transmit a signal through a random access channel; and

determining if a signal is to be transmitted through a random access channel by comparing the reverse channel status to the reference value.

5. The method of claim 4, wherein the determining of the reference value comprises:

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

6. The method of claim 4, wherein the determining of the reference value comprises:

selecting any one reference value by considering at least one of a delay time of a 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, wherein the determining of whether to transmit a signal through a random access channel comprises:

determining a reference value for the determination that a signal is to be transmitted through a random access channel; and

determining if a signal is to be transmitted through a random access channel by comparing the reverse channel status to the reference value.

8. The method of claim 7, wherein the determining of a reference value comprises:

determining the reference value using at least one of a service QoS and statistic characteristics of a channel.

9. The method of claim 7, wherein the determining of a reference value comprises:

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

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

determining transmission power considering a reverse channel gain, when it is determined to transmit a signal through a random access channel; and

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

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

determining a difference between a variable according to propagation attenuation and an instantaneous reverse channel gain as transmission power.

12. A remote node apparatus for transmitting a signal through a Random Access Channel in a remote node of a wireless communication system using a Time Division Duplex mode, the remote node apparatus comprising:

a reception device configured to receive a signal;

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

a control unit configured to determine whether to transmit a signal through a random access channel in consideration of the reverse channel status; and

a transmission device configured to transmit a signal through the random access channel when it is determined at the control part to transmit a signal through the random access channel.

13. The remote node apparatus of claim 12, wherein the channel estimation unit estimates 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.

14. The remote node apparatus of claim 12, wherein the channel estimation unit calculates a fading value of a reverse channel using a power level of a signal received through a forward link.

15. The remote node apparatus of claim 12, wherein the control unit determines a reference value provided from a host node for determining whether to transmit a signal through a random access channel, and determines if a signal is to be transmitted through a random access channel by comparing the reverse channel status to the reference value.

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

18. The remote node apparatus of claim 12, wherein the control unit determines a reference value for the determination that a signal is to be transmitted through a random access channel, and determines if a signal is to be transmitted through a random access channel by comparing the reverse channel status to the reference value.

19. The remote node apparatus of claim 18, wherein the control unit determines the reference value using at least one of a service QoS and statistic characteristics of a channel.

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

21. The remote node apparatus of claim 12, further comprising a power control unit configured to determine transmission power considering a reverse channel gain, when it is determined to transmit a signal through a random access channel,

wherein the transmission device transmits a signal through a random access channel using transmission power determined at the power control unit.

22. The remote node apparatus of claim 21, wherein the power control unit determines a difference between a variable according to propagation attenuation and an instantaneous reverse channel gain as transmission power.