TIME SHIFTING OF CO-CHANNEL DATA TRANSMISSIONS TO REDUCE CO-CHANNEL INTERFERENCE

• US 20120113878A1
• Filed: 05/11/2010
• Published: 05/10/2012
• Est. Priority Date: 05/11/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Dhanda, Mungal Singh, Yu, Zhi-Zhong
• Granted Patent: US 9,504,046 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/03012 operating in the time domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A cellular communications system in which transmission of control signals for plural different remote stations is so displaced in time that the transmission of control signals for one remote station does not interfere with the transmission of control signals for another remote station, the displacement being sufficient to prevent contemporaneous reception of control signals by the remote station intended for the other remote station.

Claims

1. A transmitting apparatus comprising:

a source of first data;

a time reference;

a time offset allocator, coupled to the source of first data and to the time reference, for delaying the first data by a time offset relative to the time reference to produce first time-delayed data;

a transmitter, coupled to the time offset allocator, for modulating, amplifying and transmitting the first time-delayed data to produce first transmitted data;

a processor, coupled to the time reference, the time offset allocator and the transmitter, for controlling operation of the time offset allocator; and

a memory, coupled to the processor, for storing second data and instructions for the processor to use, the second data comprising data which represents a first delay value,

wherein the transmitting apparatus is configured to delay the first data by a first time delay depending on the time reference and the first delay value.

2. The transmitting apparatus of claim 1 wherein the first delay value corresponds to a whole number of data frames.

3. The transmitting apparatus of claim 1 further comprising a source of third data coupled to the time offset allocator, the second data further comprising data which represents a second delay value, the transmitting apparatus further configured to delay the third data by a second time delay depending on the time reference and the second delay value, to produce second time-delayed data, the transmitter further configured to modulate and transmit the second time-delayed data to produce second transmitted data.

4. The transmitting apparatus of claim 3 wherein the first and second time delays are different by an amount which is at least one frame.

5. The transmitting apparatus of claim 3 wherein the second time delay is equal to or greater than the duration of the first data.

6. The transmitting apparatus of either claim 1 wherein the transmitter is further configured to amplify a portion of the first data by an amount different to the remainder of the first data.

7. The transmitting apparatus of claim 6 wherein the portion of the first data comprises signalling data and the remainder comprises traffic data.

12. The transmitting apparatus of claim 7, wherein the portion of the first data comprising signalling data is delayed and at least part of another different portion of the first data comprising traffic data is not delayed.

13. The transmitting apparatus of claim 3, comprising means for transmitting the first time delayed data and the second time delayed data on the same frequency and in the same time division multiple access, TDMA, time slot.

14. The transmitting apparatus of claim 1, wherein:

a first portion of the first data comprises signalling data and a second portion of the first data, different than the first portion, comprises traffic data; and

the transmitting apparatus comprises means for transmitting the second portion of the first data using discontinuous transmission, DTX.

15. The transmitting apparatus of claim 14, further comprising:

means for transmitting the second portion of the first data at a data rate which is less than full rate.

8. A method of transmitting control data and information data to plural destinations, in which method the transmission of control data for different destinations is offset in time to avoid collision of the data at a single destination, and the power of the transmission of control data is adjusted commensurate with the distance to the intended destination for that control data.

9. The method as claimed in claim 8 wherein the control data for one destination is transmitted from one source and control data for another destination is transmitted from another different source.

10. The method as claimed in claim 8 wherein the control data is transmitted to the plural destinations from a single source.

11. The method as claimed in any one of claims 8, 9, or 10 wherein control data is permitted to be transmitted contemporaneously with information data.

16. A communication system comprising at least one base station and plural remote stations in which:

traffic data and signaling data for the remote stations are transmitted by the at least one base station in defined sequences of traffic frames and signaling frames;

at least two of the remote stations are configured to receive their respective traffic frames and signaling frames simultaneously and at the same frequency; and

the sequences of the at least two remote stations are so defined that the signaling frames for each of the two remote stations occupy different positions in the defined sequences.

17. The communication system of claim 16, wherein:

the traffic data is transmitted at a traffic power level and the signaling data is transmitted at a signaling power level; and

the signaling power level is controlled to be greater than the traffic power level when a signaling frame for one remote station and a traffic frame for another remote station occupy the same position.

18. A remote station for use in the communication system of claim 16, comprising:

first receiving means for receiving data intended for the remote station for use, together with data intended for another remote station on the same frequency and in the same time slot;

second receiving means for receiving signaling data intended for the remote station for use during a first time interval different than a second time interval allocated for receiving signaling data intended for the another remote station; and

means for transmitting an indication that the remote station comprises the second receiving means.

19. The remote station of claim 18, wherein the second receiving means is configured to receive the signaling data intended for the remote station for use during a time interval allocated for transmitting traffic data for the another remote station.

20. A transmitting apparatus for use in a base station of a communication system, the transmitting apparatus comprising:

means for transmitting traffic data and signaling data for at least two remote stations in defined sequences of traffic frames and signaling frames so that the sequences of the at least two remote stations are so defined that the signaling frames for each of the two remote stations occupy different positions in the defined sequences.

21. The transmitting apparatus of claim 20, comprising:

means for transmitting the traffic data at a traffic power level;

means for transmitting the signaling data at a signaling power level; and

means for controlling the signaling power level to be greater than the traffic power level when a signaling frame for one remote station and a traffic frame for another remote station occupy the same position.

22. The transmitting apparatus of claim 20, comprising:

means for receiving an indication that one remote station is capable of receiving signaling data transmitted during a first time interval different than a second time interval allocated for the transmission of signaling data intended for another different remote station; and

means for transmitting signaling data intended for the one remote station during the first time interval and transmitting signaling data intended for another different remote station during the second time interval.

23. The transmitting apparatus of any one of claim 20, further comprising means for transmitting the traffic data using discontinuous transmission, DTX.

24. A transmitting apparatus comprising:

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, the instructions being executable by the processor to;

transmit traffic data and signaling data for at least two remote stations in defined sequences of traffic frames and signaling frames so that the sequences of the at least two remote stations are so defined that the signaling frames for each of the two remote stations occupy different positions in the defined sequences.

25. A computer program product comprising:

computer-readable media comprising;

code for causing a computer to transmit data, comprising instructions to;

transmit traffic data and signaling data for at least two remote stations in defined sequences of traffic frames and signaling frames so that the sequences of the at least two remote stations are so defined that the signaling frames for each of the two remote stations occupy different positions in the defined sequences.