Reverse link initial power setting using effective radiated power message to compute path loss

• US 9,661,583 B2
• Filed: 08/09/2013
• Issued: 05/23/2017
• Est. Priority Date: 02/23/2000
• Status: Expired due to Term

• Current Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Original Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Inventors: Hoffmann, John E., Rouphael, Antoine J., Nelson, Jr., George R., Proctor, Jr., James A.
• Primary Examiner(s): Park, Jung
• Application Number:
  US13/963,115
• Publication Number:
  US 20130322341A1
• Time in Patent Office: 1,383 Days
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 12/5602 Bandwidth control in ATM Networks, e.g. leaky bucket
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 47/26 using explicit feedback to the source, e.g. choke packets
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 74/0825 with collision detection
• CPC Class Codes: H04W 74/0858 collision detection
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]

Abstract

In an illustrative embodiment of the present invention, a reference signal including pilot information is transmitted from a base station to one or multiple field units over a pilot channel. A message is also sent to the field units over a paging channel to indicate an effective radiated power level at which the reference signal is transmitted on the pilot channel. Based on a received power level of the reference signal at a field unit and the effective radiated power level of the reference signal, a forward path loss is estimated at the field unit for the forward link between the base station and field unit. Assuming the path loss in the reverse link is approximately the same as the estimated forward link path loss, the field unit can transmit, a reply message in the reverse link so that the base station generally receives a message at-a desired power level.

Claims

1. A method for use in a subscriber unit for performing an access procedure, the method comprising:

transmitting a first signal to a base station wherein the first signal is associated with requesting access to a network associated with the base station;

monitoring, in response to transmission of the first signal, for a first message from the base station, wherein the first message includes timing and power adjustment information for transmitting an access request message to the base station over an uplink shared channel;

transmitting the access request message to the base station over the uplink shared channel in accordance with the timing and power adjustment information, wherein the access request message indicates a request to establish a communication connection and includes identification information associated with the subscriber unit; and

receiving a second message from the base station in response to the access request message, wherein the second message indicates the identification information associated with the subscriber unit to resolve a potential collision.

2. The method of claim 1, further comprising:

retransmitting the first signal on a condition that processing of the second message indicates the access request message was not correctly received by the base station.

3. The method of claim 1, wherein a communication connection is established on a condition that processing of the second message indicates the access request message was correctly received by the base station.

4. The method of claim 3, wherein the established communication connection is a bidirectional traffic communication link.

5. The method of claim 1, further comprising:

transmitting a second signal on the uplink shared channel, wherein a first part of the second signal has pilot symbols and a second part of the second signal has every other symbol a pilot symbol.

6. The method of claim 1, wherein the second message is an indication of non-collision of the access request message from the subscriber unit.

7. A subscriber unit for performing an access procedure comprising:

a transmitter configured to transmit a first signal to a base station wherein the first signal is associated with requesting access to a network associated with the base station;

a receiver configured, in response to transmission of the first signal, to monitor for a first message from the base station, wherein the first message includes timing and power adjustment information for transmitting an access request message to the base station over an uplink shared channel;

the transmitter further configured to transmit the access request message to the base station over the uplink shared channel in accordance with the timing and power adjustment information, wherein the access request message indicates a request to establish a communication connection and includes identification information associated with the subscriber unit; and

the receiver further configured to receive a second message from the base station in response to the access request message, wherein the second message indicates the identification information associated with the subscriber unit to resolve a potential collision.

8. The subscriber unit of claim 7, wherein the transmitter is further configured to retransmit the first signal on a condition that processing of the second message indicates the access request message was not correctly received by the base station.

9. The subscriber unit of claim 7, wherein a communication connection is established on a condition that processing of the second message indicates the access request message was correctly received by the base station.

10. The subscriber unit of claim 9, wherein the established communication connection is a bidirectional traffic communication link.

11. The subscriber unit of claim 7, further comprising:

the transmitter is further configured to transmit a second signal on the uplink shared channel, wherein a first part of the second signal has pilot symbols and a second part of the second signal has every other symbol a pilot symbol.

12. The subscriber unit of claim 7, wherein the second message is an indication of non-collision of the access request message from the subscriber unit.

13. A base station in a network comprising:

a receiver configured to receive a first signal from a subscriber unit wherein the first signal is associated with an access procedure;

a transmitter configured to transmit a first message to the subscriber unit in response to receiving the first signal from the subscriber unit, wherein the first message includes timing and power adjustment information for transmitting an access request message to the base station over an uplink shared channel;

the receiver further configured to receive the access request message from the subscriber unit over the uplink shared channel in accordance with the timing and power adjustment information, wherein the access request message indicates a request to establish a communication connection and includes identification information associated with the subscriber unit; and

the transmitter further configured to transmit a second message to the subscriber unit in response to the access request message, wherein the second message indicates the identification information associated with the subscriber unit to resolve a potential collision.

14. The base station of claim 13, wherein the receiver is further configured to decode the access request message, wherein the access request message includes encoded information.

15. The base station of claim 13, wherein the access procedure is a random access procedure.

16. The base station of claim 13, further comprising:

the receiver is further configured to receive a second signal on the uplink shared channel, wherein a first part of the second signal has pilot symbols and a second part of the second signal has every other symbol a pilot symbol.

17. The base station of claim 13, wherein the second message is an indication of non-collision of the access request message from the subscriber unit.