Turbo HSDPA system

• US 20060187876A1
• Filed: 02/22/2006
• Published: 08/24/2006
• Est. Priority Date: 02/22/2005
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Onggosanusi, Eko N., Dabak, Anand G., Papasakellariou, Aris, Schmidl, Timothy M.
• Granted Patent: US 8,811,273 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 1/1615 Switching on; Switching off, e.g. remotely battery saving circuits associated with selective call operation H04W52/00; details of power consumption reduction in a PLL, H03L7/0802, H03L7/14, H03L2207/08, H03L2207/18; muting amplifiers by gain control see H03G3/34
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/2656 for structure of frame, burst
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of power saving for a wireless transceiver (FIGS. 1 and 2) is disclosed. The transceiver has an active power mode (504) and a reduced power mode (510). The transceiver is operated in the reduced power mode (510) and monitors transmissions from a remote wireless transmitter while in the reduced power mode. The transceiver identifies a transmission from the remote wireless transmitter by a transceiver identity included in the transmission (FIG. 6, UE identification). The transceiver transitions to the active power mode (512) in response to identifying the transmission.

Claims

1. A method of power saving in a transceiver during a time interval, the time interval having a plurality of signals, comprising the steps of:

receiving a first signal of the plurality of signals in an active power mode;

determining if there are other signals of the plurality of signals for the transceiver in response to the first signal;

operating the transceiver in the active power mode when there are other signals of the plurality of signals for the transceiver; and

operating the transceiver in a reduced power mode when there are no other signals of the plurality of signals for the transceiver.

2. A method as in claim 1, wherein the first signal is transmitted from a remote transmitter in a shared control channel.

3. A method as in claim 1, wherein the plurality of signals comprises at least three orthogonal frequency division multiplex (OFDM) symbols, and wherein the first signal is included in one of a first and second OFDM symbols in time.

4. A method as in claim 3, wherein the first signal comprises an identity of the transceiver.

5. A method of transmitting symbols, comprising the steps of:

forming a plurality of symbols in a packet;

forming pilot and control signals in a first symbol of the plurality of symbols;

excluding pilot signals from at least another symbol of the plurality of symbols; and

transmitting the packet.

6. A method as in claim 5, comprising the step of forming pilot and control signals in a second symbol of the plurality of symbols, wherein the second symbol is adjacent in time to the first symbol.

7. A method as in claim 5, wherein the step of transmitting comprises transmitting the packet during a transmit time interval (TTI).

8. A method as in claim 5, wherein each symbol of the plurality of symbols is an orthogonal frequency division multiplex (OFDM) symbol.

9. A method as in claim 5, wherein a transmit power for the pilot signals is greater than a transmit power for the control signals.

10. A method of transmitting an orthogonal frequency division multiplex (OFDM) signal, comprising the steps of:

transmitting on a plurality of control channels during a transmit time interval; and

transmitting a counter during the transmit time interval to indicate a number of the plurality of control channels in the transmit time interval.

11. A method as in claim 10, wherein each control channel corresponds to a respective user in a wireless cell.

12. A method as in claim 10, wherein the counter value specifies a number of the plurality of control channels with a specific coding and modulation scheme.

13. A method of transmitting an orthogonal frequency division multiplex (OFDM) signal during a transmit time interval (TTI), comprising the steps of:

transmitting a plurality of control channels during a transmit time interval, each control channel corresponding to a respective user; and

transmitting a counter associated with each respective control channel to indicate a size of said each respective control channel of the plurality of control channels.

14. A method as in claim 13, wherein the size of said each respective control channel is variable.

15. A method of transmitting a broadcast orthogonal frequency division multiplex (OFDM) signal, comprising the steps of:

determining a plurality of broadcast channels;

transmitting on a set of broadcast channels within the plurality of broadcast channels during a transmit time interval (TTI); and

transmitting a broadcast channel bitmap to indicate the set of broadcast channels are active during the transmit time interval.

16. A method as in claim 15, wherein a number of the set of broadcast channels is less than a number of the plurality of broadcast channels.

17. A method as in claim 15, wherein broadcast channels of the plurality of broadcast channels other than the set of broadcast channels are inactive during the transmit time interval.

18. A method for power saving during a communications session in which packet transmission is scheduled at predetermined time intervals, comprising the steps of:

operating a transceiver having an active power mode and a reduced power mode;

operating the transceiver in the active power mode at the predetermined time intervals of the communications session; and

operating the transceiver in the reduced power mode during remaining time intervals of the communications session.

19. A method as in claim 18, wherein the transceiver sends a remote wireless transmitter an acknowledge (ACK) signal from the active power mode.

20. A method as in claim 18, wherein the transceiver returns to the reduced power mode at a first time after receiving a most recent transmission from the remote wireless transmitter.

21. A method as in claim 20, wherein the transceiver has a second reduced power mode, comprising the step of operating in the second reduced power mode at an end of the communication session.

22. A method as in claim 18, wherein the transceiver determines the predetermined time intervals in response to information in a shared control channel.

23. A method as in claim 18, wherein the transceiver determines the predetermined time intervals in response to information in a common control channel.

24. A method of transmitting a control channel, comprising the steps of:

transmitting a first part of the control channel that is encoded; and

transmitting a second part of the control channel that is encoded differently than the first part.

25. A method as in claim 24, wherein the control channel is an orthogonal frequency division multiplex (OFDM) control channel.

26. A method as in claim 24, wherein the first part is a common part comprising user equipment (UE) identities, and wherein the second part is a UE dedicated part.