Wireless telecommunications network, a user terminal therefor, a base station therefor, and a method of telecommunication

• US 20030043778A1
• Filed: 08/12/2002
• Published: 03/06/2003
• Est. Priority Date: 08/28/2001
• Status: Abandoned Application

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Samuel, Louis Gwyn, Luschi, Carlo
• Application Number:
  US10/216,951
• Publication Number:
  US 20030043778A1
• Time in Patent Office: Days
• US Class Current: 370/349
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/1657 Implicit acknowledgement of correct or incorrect reception, e.g. with a moving window
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04W 28/22 Negotiating communication rate

Abstract

A wireless telecommunications network comprises a first terminal (2) and a second terminal (UE), the second terminal including a receiving stage and a processor (10) operative to process signals received from the first terminal and to determine received signal quality. The second terminal also includes a transmitter (Tx) operative to send a feedback signal (QI, RAI) dependent upon the received signal quality to the first terminal provided the change in received signal quality is determined as being more than a predetermined amount.

Claims

1. A High Speed Downlink Packet Access (HSDPA) wireless telecommunications network comprising a first terminal, the first terminal communicating with a second terminal over a control channel, the first terminal including a receiving stage and a processor (10) operative to process signals received from the second terminal and to determine received signal quality, the first terminal also including a transmitter (Tx) operative to send a feedback signal (QI, RAI) dependent upon the received signal quality to the second terminal over the control channel provided the change in received signal quality is determined as being more than a predetermined amount, and the transmitter (Tx) being operative not to send the feedback signal if the change in received signal quality is determined as being not more than the predetermined amount, wherein said feedback signal is indicative of a data transmission rate and/or modulation and coding scheme to the second terminal.

2. A HSDPA wireless telecommunications network according to claim 1, in which the change in received signal quality is that between its latest determined value and the one before.

3. A HSDPA wireless telecommunications network according to claim 2, in which the feedback signal is in the form of a Quality Information QAI field or Rate and Antenna Information RAI field in a data packet on the control channel.

4. A HSDPA wireless telecommunications network according to claim 3, in which the feedback signal is indicative of the received signal quality (QI) and/or the supportable data rate (RAI) selected in consequence.

5. A HSDPA wireless telecommunications network according to claim 3, in which the control channel is a dedicated physical control channel DPCCH.

6. A HSDPA wireless telecommunications network according to claim 3, in which the first terminal is a base station (2) and the second terminal is a mobile user terminal (UE).

7. A HSDPA wireless telecommunications network according to claim 2, in which the feedback signal is indicative of the received signal quality (QI) and/or the supportable data rate (RAI) selected in consequence.

8. A HSDPA wireless telecommunications network according to claim 7, in which the control channel is a dedicated physical control channel DPCCH.

9. A HSDPA wireless telecommunications network according to claim 7, in which the first terminal is a base station (2) and the second terminal is a mobile user terminal (UE).

10. A HSDPA wireless telecommunications network according to claim 2, in which the control channel is a dedicated physical control channel DPCCH.

11. A HSDPA wireless telecommunications network according to claim 2, in which the first terminal is a base station (2) and the second terminal is a mobile user terminal (UE).

12. A HSDPA wireless telecommunications network according to claim 1, in which the feedback signal is in the form of a Quality Information QAI field or Rate and Antenna Information RAI field in a data packet on the control channel.

13. A HSDPA wireless telecommunications network according to claim 1, in which the feedback signal is indicative of the received signal quality (QI) and/or the supportable data rate (RAI) selected in consequence.

14. A HSDPA wireless telecommunications network according to claim 1, in which the control channel is a dedicated physical control channel DPCCH.

15. A HSDPA wireless telecommunications network according to claim 1, in which the first terminal is a base station (2) and the second terminal is a mobile user terminal (UE).

16. A HSDPA wireless telecommunications network according to claim 1 further comprising the second terminal.

17. A user terminal (UE) for HSDPA wireless communications comprising a receiving stage, a processor (10) operative to process signals received using a modulation and coding scheme and to determine received signal quality, and a transmitter (Tx) operative to send a feedback signal (QI, RAI) dependent upon received signal quality over a control channel provided the change in received signal quality is determined as being more than a predetermined amount so as to cause a change to a different modulation and coding scheme in consequence, the transmitter (Tx) being operative such that the feedback signal is not sent if the change in received signal quality is determined as being not more than the predetermined amount.

18. A base station for HSDPA wireless telecommunications comprising a transmitter (Tx) operative to transmit signals to user terminals, means to adjust transmission rate to a user terminal dependent upon a received feedback signal (QI, RAI) being sent over a control channel from a user terminal, the feedback signal being sent if the change in quality of signal received by the user terminal is determined as being more than a predetermined amount, the feedback signal not being sent if the change in received signal quality is determined as being not more than the predetermined amount, and the base station comprising means to maintain a transmission rate to a user terminal whilst the feedback signal is not received.

19. A method of HSDPA wireless telecommunication between a first terminal (2) and a second terminal (UE), the second terminal processing (10) signals received from the first terminal and transmitting a feedback signal dependent upon received signal quality (QI) over a control channel to the first terminal provided the change in received signal quality is determined as being more than a predetermined amount, the feedback signal not being sent if the change in received signal quality is determined as being not more than the predetermined amount, the first terminal changing to a different data transmission rate and/or modulation and coding scheme in consequence of receiving said feedback signal.