Method and device for configuring pilot in wireless communication system

• US 9,240,872 B2
• Filed: 03/22/2012
• Issued: 01/19/2016
• Est. Priority Date: 03/25/2011
• Status: Active Grant

• Current Assignee: Nufront Mobile Communications Technology Company Limited
• Original Assignee: Nufront Mobile Communications Technology Company Limited
• Inventors: Bao, Dongshan, Wang, Jing, Liu, Shenfa, Yan, Zhigang, Wang, Feifei
• Primary Examiner(s): Gidado, Rasheed
• Application Number:
  US14/007,576
• Publication Number:
  US 20140016622A1
• Time in Patent Office: 1,398 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0085 when channel conditions change

Abstract

Disclosed is a method for configuring a pilot frequency in a wireless communication system, comprising: on the basis of at least one item among a current wireless channel characteristic parameter, device capability information of a correspondent node, and system requirement information, configuring in real-time a pilot frequency for different transmissions during a transmission process; and transmitting the configuration result to the correspondent node. Also disclosed is a corresponding device for configuring the pilot frequency. The present invention allows for configuration in real-time of the pilot frequency. This facilitates improved transmission reliability and guaranteed communication quality, and reduces pilot frequency overhead, and at the same time, is applicable in additional number of channel environments and application scenarios.

Claims

1. A method of configuring a pilot in a wireless communication system, comprising:

configuring pilots in real time for different transmission in the transmission process, based on at least one of current wireless channel characteristic parameters, device capability information of a communication peer, and system requirement information; and

sending a configuration result to the communication peer;

wherein configuring pilots in real time comprises;

configuring a time domain pilot density to be within a preset time domain density range corresponding to at least one of the current wireless channel characteristic parameters, device capability information of a communication peer and system requirement information;

and/or configuring a frequency domain pilot density to be within a preset frequency domain density range corresponding to at least one of the current wireless channel characteristic parameters, device capability information of a communication peer and system requirement information;

wherein the wireless channel characteristic parameters comprise;

a wireless channel correlation bandwidth and wireless channel correlation time;

the wider the wireless channel correlation bandwidth is, the less the corresponding frequency domain density within the preset the frequency domain density range is; and

the longer the wireless channel correlation time is, the less the corresponding time domain density within the preset the time density range is.

2. The method of claim 1, wherein the device capability information of the communication peer comprises:

frequency synchronization accuracy and/or sampling phase synchronization accuracy;

the higher the frequency synchronization accuracy is, the less the corresponding time domain density within the preset time domain density range is, and the less the corresponding frequency domain density within preset frequency domain density range; and

the higher the sampling phase synchronization accuracy is, the less the corresponding time domain density within the preset time domain density range is, and the less the corresponding frequency domain density within the preset frequency domain density range is.

3. The method of claim 2, wherein configuring the time domain pilot density to be within the preset time domain density range corresponding to the device capability information of the communication peer comprises:

configuring the time domain pilot density to be within the preset time domain density range corresponding to at least one of the frequency synchronization accuracy and the sampling phase synchronization accuracy; and

configuring the frequency domain pilot density to be within the preset frequency domain density range corresponding to the device capability information of the communication peer comprises;

configuring the frequency domain pilot density to be within the preset frequency domain density range corresponding to at least one of the frequency synchronization accuracy and the sampling phase synchronization accuracy.

4. The method of claim 1, wherein the system requirement information comprises at least one of a modulation format, a coding scheme and a code rate;

the higher the modulation order is, the larger the corresponding time domain density within the preset time domain density range is, and the larger the corresponding frequency domain density within the preset frequency domain density range is;

the higher a code word error correction capability is, the less the corresponding time domain density within the preset time domain density range is, and the less the corresponding frequency domain density within the preset frequency domain density range is; and

the higher the code rate is, the larger the corresponding time domain density within the preset time domain density range is, and the larger the corresponding frequency domain density within the preset frequency domain density range is.

5. The method of claim 4, wherein the system requirement information further comprises a coding scheme and/or a code rate;

after being configured to be within the preset time domain density range corresponding to the system requirement information, the time domain pilot density is further finely adjusted according to a preset time domain adjustment value corresponding to the coding scheme and/or the code rate; and

after being configured to be within the preset frequency domain density range corresponding to the system requirement information, the frequency domain pilot density is further finely adjusted according to a preset frequency domain adjustment value corresponding to the coding scheme and/or the code rate.

6. The method of claim 4, wherein, configuring the time domain pilot density to be within the preset time domain density range corresponding to the system requirement information comprises:

configuring the time domain pilot density to be within the preset time domain density range corresponding to at least one of the modulation format, the code word error correction capability and the code rate; and

configuring the frequency domain pilot density to be within the preset frequency domain density range corresponding to the system requirement information comprises;

configuring the frequency domain pilot density to be within the preset frequency domain density range corresponding to at least one of the modulation format, the code word error correction capability and the code rate.

7. The method of claim 1, when configuring the time domain pilot density and the frequency domain pilot density, further comprising:

in a resource block, setting a preset OFDM symbol as a starting insertion location, determining OFDM symbols into which the pilots are to be inserted according to a result of configuring the time domain pilot density, then setting a preset subcarrier as the starting insertion location for each of the OFDM symbols into which the pilots are to be inserted, and inserting the pilots according to a result of configuring the frequency domain pilot density;

when configuring the time domain pilot density, further comprising;

in a resource block, setting a preset OFDM symbol as a starting insertion location, determining OFDM symbols into which the pilots are to be inserted according to a result of configuring the time domain pilot density, and then inserting the pilots in preset subcarriers for each of the OFDM symbols into which the pilots are to be inserted;

when configuring the frequency domain pilot density, further comprising;

in a resource block, setting a preset subcarrier as a starting insertion location, determining subcarriers into which the pilots are to be inserted according to a result of configuring the frequency domain pilot density, and inserting the pilots in the preset OFDM symbols for each of the subcarriers into which the pilots are to be inserted.

8. The method of claim 1, wherein, sending the configuration result to the communication peer comprises:

carrying information indicating the pilot configuration result in the signal sent to the communication peer;

or, sending signaling used to indicate the pilot configuration result to the communication peer via a control channel.

9. A device of configuring a pilot in a wireless communication system, comprising a processor and a storage device, wherein the storage device stores processor-executable programs, and the programs comprise:

a configuring unit, which is adapted to configure pilots in real time for different transmission in the transmission process based on at least one of current wireless channel characteristic parameters, device capability information of a communication peer, and system requirement information; and

a transmitting unit, which is adapted to send a configuration result from the configuration unit to the communication peer;

wherein, the configuring unit is adapted to configure a time domain pilot density to be within a preset time domain density range corresponding to at least one of the current wireless channel characteristic parameters, device capability information of the communication peer, and system requirement information; and

/or to configure a frequency domain pilot density to be within a preset frequency domain density range corresponding to at least one of the current wireless channel characteristic parameters, device capability information of the communication peer, and system requirement information;

wherein the wireless channel characteristic parameters comprise;

a wireless channel correlation bandwidth and wireless channel correlation time;

the wider the wireless channel correlation bandwidth is, the less the corresponding frequency domain density within the preset the frequency domain density range is; and

the longer the wireless channel correlation time is, the less the corresponding time domain density within the preset the time density range is.

10. The device of claim 9, wherein the device capability information of the communication peer comprises:

frequency synchronization accuracy and/or sampling phase synchronization accuracy;

the higher the frequency synchronization accuracy is, the less the corresponding time domain density within the preset time domain density range is, and the less the corresponding frequency domain density within preset frequency domain density range; and

the higher the sampling phase synchronization accuracy is, the less the corresponding time domain density within the preset time domain density range is, and the less the corresponding frequency domain density within the preset frequency domain density range is.

11. The device of claim 10, wherein the configuring unit configures the time domain pilot density to be within the preset time domain density range corresponding to the device capability information of the communication peer by configuring the time domain pilot density to be within the preset time domain density range corresponding to at least one of the frequency synchronization accuracy and the sampling phase synchronization accuracy;

and

the configuring unit configures the frequency domain pilot density to be within the preset frequency domain density range corresponding to the device capability information of the communication peer by configuring the frequency domain pilot density to be within the preset frequency domain density range corresponding to at least one of the frequency synchronization accuracy and the sampling phase synchronization accuracy.

12. The device of claim 9, wherein the system requirement information comprises at least one of a modulation format, a coding scheme and a code rate;

the higher the modulation order is, the larger the corresponding time domain density within preset time domain density range is, and the larger the corresponding frequency domain density within the preset frequency domain density range is;

the higher a code word error correction capability is, the less the corresponding time domain density within the preset time domain density range is, and the less the corresponding frequency domain density within the preset frequency domain density range is; and

the higher the code rate is, the larger the corresponding time domain density within the preset time domain density range is, and the larger the corresponding frequency domain density within the preset frequency domain density range is.

13. The device of claim 12, wherein the system requirement information further comprises a coding scheme and/or a code rate;

after configuring the time domain pilot density to be within the preset time domain density range corresponding to the system requirement information, the configuring unit further finely adjusts the time domain pilot density according to a preset time domain adjustment value corresponding to the coding scheme and/or the code rate; and

after configuring the frequency domain pilot density to be within the preset frequency domain density range corresponding to the system requirement information, the configuring unit further finely adjusts the frequency domain pilot density according to a preset frequency domain adjustment value corresponding to the coding scheme and/or a code rate.

14. The device of claim 12, wherein, the configuring unit configures the time domain pilot density to be within the preset time domain density range corresponding to the system requirement information by configuring the time domain pilot density to be within the preset time domain density range corresponding to at least one of the modulation format, the code word error correction capability and the code rate;

and

the configuring unit configures the frequency domain pilot density to be within the preset frequency domain density range corresponding to the system requirement information by configuring the frequency domain pilot density to be within the preset frequency domain density range corresponding to at least one of the modulation format, the code word error correction capability and the code rate.

15. The device of claim 9, wherein, the configuring unit comprises:

a setting module, which is adapted to, in a resource block, set a preset OFDM symbol as a starting insertion location, determine OFDM symbols into which the pilots are to be inserted according to a result of configuring the time domain pilot density, then set a preset subcarrier as the starting insertion location for each of the OFDM symbols into which the pilots are to be inserted, and insert the pilots according to a result of configuring the frequency domain pilot density;

or

the configuring unit comprises a setting module, which is adapted to, in a resource block, set a preset OFDM symbol as a starting insertion location, determine OFDM symbols into which the pilots are to be inserted according to a result of configuring the time domain pilot density, and then insert the pilots in preset subcarriers for each of the OFDM symbols into which the pilots are to be inserted;

or

the configuring unit comprises a setting module, which is adapted to, in a resource block, set a preset subcarrier as a starting insertion location, determine subcarriers into which the pilots are to be inserted according to a result of configuring the frequency domain pilot density, and insert the pilots in the preset OFDM symbols for each of the subcarriers into which the pilots are to be inserted.

16. The device of claim 9, wherein, the transmitting unit carries information indicating the pilot configuration result in the signal sent to the communication peer;

or, sends signaling used to indicate the pilot configuration result to the communication peer via a control channel.