Methods and Apparatuses for Measuring CSI

• US 20150358139A1
• Filed: 12/30/2013
• Published: 12/10/2015
• Est. Priority Date: 01/18/2013
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: HAO, Peng, LI, Weimin, LI, Yu Ngok, REN, Lu
• Granted Patent: US 9,979,526 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network

Abstract

Provided are methods and apparatuses for measuring CSI. The method comprises: a terminal device determining whether a subframe a channel state information interference measurement resource is located on is a downlink subframe; when the subframe where the channel state information interference measurement resource is located is a downlink subframe, the terminal device executing interference measurement by using the channel state information interference measurement resource. By means of the present disclosure, the technical problem is solved that it is difficult to effectively perform the CSI measurement caused when a base station flexibly adjust uplink-downlink configuration in a related technology, thereby achieving the technical effect of improving the data transmission performance of a system.

Claims

1. A method for measuring channel state information (CSI), comprising:

a terminal device determining whether a subframe where a channel state information interference measurement resource is located is a downlink subframe;

when the subframe where the channel state information interference measurement resource is located is a downlink subframe, the terminal device executing interference measurement by using the channel state information interference measurement resource.

2. The method according to claim 1, wherein the terminal device determines whether the subframe where the channel state information interference measurement resource is located is a downlink subframe through at least one of the following manners:

the terminal device determining whether the subframe where the channel state information interference measurement resource is located is the downlink subframe according to uplink-downlink configuration information received from a network side device;

the terminal device determining whether the subframe where the channel state information interference measurement resource is located is the downlink subframe according to downlink scheduling information which is received from the network side device and corresponding to the subframe where the channel state information interference measurement resource is located;

the terminal device determining whether the subframe where the channel state information interference measurement resource is located is the downlink subframe according to a downlink control channel on the subframe where the channel state information interference measurement resource received from the network side device is located; and

the terminal device determining whether the subframe where the channel state information interference measurement resource is located is the downlink subframe according to CSI measurement report trigger information which is received from the network side device and corresponding to the subframe where the channel state information interference measurement resource is located.

3. The method according to claim 1 or 2, wherein before the terminal device determines whether the subframe where the channel state information interference measurement resource is located is a downlink subframe, the method further comprises:

the terminal device receiving configuration information sent by a network side device, wherein the configuration information is used for indicating channel state information interference measurement resources configured for multiple subframe groups by the network side device, and each subframe group in the multiple subframe groups comprises one or more subframes.

4. The method according to claim 3, wherein the multiple subframe groups comprise:

a first subframe group and a second subframe group.

5. The method according to claim 4, wherein

the first subframe group comprises one or more downlink subframes of which a transmission direction is fixed to be downlink;

and the second subframe group comprises one or more subframes of which a transmission direction allows to be adjusted;

or,

the first subframe group comprises one or more subframes which are configured to be one or more downlink transmission subframes by a current network side device, wherein one or more subframes at a location corresponding to the one or more downlink transmission subframes are also configured to be one or more downlink transmission subframes by a network side device of which the distance between this network side device and the current network side device is less than a preset threshold value; and

the second subframe group comprises one or more subframes which are configured to be one or more downlink transmission subframes by a current network side device, wherein one or more subframes at a location corresponding to the one or more downlink transmission subframes are configured to be one or more uplink transmission subframes by a network side device of which the distance between this network side device and the current network side device is less than the preset threshold value;

or,

the first subframe group comprises one or more downlink subframes on which channel state information measured and reported by a terminal device is less than a preset threshold, and the second subframe group comprises one or more downlink subframes on which channel state information measured and reported by the terminal device is more than the preset threshold.

6. The method according to claim 3, wherein the channel state information interference measurement resources configured for the multiple subframe groups by the network side device comprise at least one of the following:

periodic channel state information interference measurement resources configured for different subframe groups in the multiple subframe groups by the network side device; and

aperiodically triggered channel state information interference measurement resources configured for different subframe groups in the multiple subframe groups by the network side device.

7. The method according to claim 6, wherein the aperiodically triggered channel state information interference measurement resources configured for different subframe groups in the multiple subframe groups are configured by the network side device according to CSI measurement report trigger information.

8. The method according to claim 7, wherein the CSI measurement report trigger information comprises:

a channel state information request (CSI request) in downlink control information (DCI).

9. The method according to claim 3, wherein the channel state information interference measurement resources configured for the multiple subframe groups by the network side device comprise:

the channel state information interference measurement resources configured for different subframe groups in the multiple subframe groups by the network side device are located in different subframes.

10. The method according to claim 9, wherein the channel state information interference measurement resources configured for different subframe groups in the multiple subframe groups by the network side device are located in different subframes which are indicated by different subframe offsets.

11. The method according to claim 3, wherein

in a case where the multiple subframe groups are determined by the network side device in a semi-static manner, the multiple subframe groups are determined by the network side device in a period of multiple radio frames;

and

in a case where the multiple subframe groups are determined by the network side device in a dynamic manner, the multiple subframe groups are determined by the network side device in a period of one radio frame.

12. The method according to claim 11, wherein in the case where the multiple subframe groups are determined by the network side device in the semi-static manner, the multiple subframe groups configured by the network side device for each radio frame in the multiple radio frames are the same.

13. The method according to claim 3, wherein the configuration information is further used for indicating one or more subframes, which are configured with a channel state information interference measurement resource, in each subframe group of the multiple subframe groups, and/or indicating a subframe group to which each subframe configured with the channel state information interference measurement resource belongs.

14. The method according to claim 13, wherein the terminal device executing the interference measurement by using the channel state information interference measurement resource comprises:

the terminal device executing the interference measurement by using the channel state information interference measurement resource; and

the terminal device determining a subframe group to which a subframe where the channel state information interference measurement resource is located belongs according to the configuration information, and using the measurement result obtained by executing the interference measurement as a measurement result of the determined subframe group.

15. The method according to claim 14, wherein after the terminal device determines the subframe group to which the subframe where the channel state information interference measurement resource is located belongs according to the configuration information, and uses the measurement result obtained by executing the interference measurement as the measurement result of the determined subframe group, the method further comprises:

the terminal device determining CSI corresponding to the subframe group to which the subframe where the channel state information interference measurement resource is located belongs according to the measurement result; and

the terminal device sending the CSI to a network side device.

16. The method according to claim 15, wherein the terminal device sending the CSI to the network side device comprises:

the terminal device sending the CSI to the network side device through a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) on an uplink subframe providing ACK/NACK feedback for downlink transmission of a subframe where the channel state information interference measurement resource is located;

the terminal device sending the CSI to the network side device through a PUCCH or PUSCH on the first uplink subframe which locates after a subframe where the channel state information interference measurement resource is located and of which an interval between this uplink subframe and the subframe where the channel state information interference measurement resource is located is greater than or equal to n, where n is a natural number greater than or equal to 3; and

the terminal device assuming the subframe where the channel state information interference measurement resource is located as an uplink subframe, and the terminal device sending the CSI to the network side device through the PUCCH or PUSCH on an uplink retransmission subframe corresponding to this subframe.

17. The method according to any one of claims 1-16, wherein the channel state information interference measurement resource is a channel state information-interference measurement (CSI-IM) resource configured based on a zero-power channel state information reference signal.

18. A method for measuring channel state information (CSI), comprising:

a network side device configuring channel state information interference measurement resources for multiple subframe groups; and

the network side device sending configuration information to a terminal device, wherein the configuration information is used for instructing the terminal device to execute interference measurement when a subframe where a channel state information interference measurement resource is located is a downlink subframe.

19. The method according to claim 18, wherein the multiple subframe groups comprise:

a first subframe group and a second subframe group.

20. The method according to claim 19, wherein

the first subframe group comprises one or more downlink subframes of which a transmission direction is fixed to be downlink, and the second subframe group comprises one or more subframes of which a transmission direction allows to be adjusted;

or,

the first subframe group comprises one or more subframes which are configured to be one or more downlink transmission subframes by a current network side device, wherein one or more subframes at a location corresponding to the one or more downlink transmission subframes are also configured to be one or more downlink transmission subframes by a network side device of which the distance between this network side device and the current network side device is less than a preset threshold value; and

the second subframe group comprises one or more subframes which are configured to be one or more downlink transmission subframes by a current network side device, wherein one or more subframes at a location corresponding to the one or more downlink transmission subframes are configured to be one or more uplink transmission subframes by a network side device of which the distance between this network side device and the current network side device is less than the preset threshold value;

or,

the first subframe group comprises one or more downlink subframes on which channel state information measured and reported by a terminal device is more than a preset threshold, and the second subframe group comprises one or more downlink subframes on which channel state information measured and reported by the terminal device is less than the preset threshold.

21. The method according to claim 18, wherein the network side device configuring the channel state information interference measurement resources for the multiple subframe groups comprises at least one of the following:

the network side device configuring periodic channel state information interference measurement resources for different subframe groups in the multiple subframe groups; and

the network side device configuring aperiodically triggered channel state information interference measurement resources for different subframe groups in the multiple subframe groups.

22. The method according to claim 21, wherein the network side device configures the aperiodically triggered channel state information interference measurement resources for different subframe groups in the multiple subframe groups according to CSI measurement report trigger information.

23. The method according to claim 18, wherein the network side device configuring the channel state information interference measurement resources for the multiple subframe groups comprises:

the network side device configuring channel state information interference measurement resources located in different subframes for different subframe groups in the multiple subframe groups.

24. The method according to claim 23, wherein the network side device indicates that channel state information interference measurement resources corresponding to different subframe groups in the multiple subframe groups are located in different subframes by using different subframe offsets.

25. The method according to claim 18, wherein

in a case of determining the multiple subframe groups in a semi-static manner, the network side device determining the multiple subframe groups in a period of multiple radio frames;

and

in a case of determining the multiple subframe groups in a dynamic manner, the network side device determining the multiple subframe groups in a period of one radio frame.

26. The method according to claim 18, wherein the configuration information is further used for indicating one or more subframes, which are configured with a channel state information interference measurement resource, in each subframe group of the multiple subframe groups, and/or indicating a subframe group to which each subframe configured with the channel state information interference measurement resource belongs.

27. The method according to any one of claims 18-26, wherein the channel state information interference measurement resource is a channel state information-interference measurement (CSI-IM) resource configured based on a zero-power channel state information reference signal.

28. An apparatus for measuring channel state information (CSI), wherein the CSI measurement apparatus is located in a terminal device and comprises:

a determination element, configured to determine whether a subframe where a channel state information interference measurement resource is located is a downlink subframe; and

an execution element, configured to execute interference measurement by using the channel state information interference measurement resource when a determination result of the determination element is that the subframe where the channel state information interference measurement resource is located is a downlink subframe.

29. The apparatus according to claim 28, wherein the determination element is configured to determine whether the subframe where the channel state information interference measurement resource is located is a downlink subframe through at least one of the following manners:

determining whether the subframe where the channel state information interference measurement resource is located is the downlink subframe according to uplink-downlink configuration information received from a network side device;

determining whether the subframe where the channel state information interference measurement resource is located is the downlink subframe according to downlink scheduling information which is received from the network side device and corresponding to the subframe where the channel state information interference measurement resource is located;

determining whether the subframe where the channel state information interference measurement resource is located is the downlink subframe according to a downlink control channel on the subframe where the channel state information interference measurement resource received from the network side device is located; and

determining whether the subframe where the channel state information interference measurement resource is located is the downlink subframe according to CSI measurement report trigger information which is received from the network side device and corresponding to the subframe where the channel state information interference measurement resource is located.

30. The apparatus according to claim 28 or 29, further comprising:

a reception element, configured to receive configuration information sent by a network side device before determining whether the subframe where the channel state information interference measurement resource is located is a downlink subframe, wherein the configuration information is used for indicating channel state information interference measurement resources configured for multiple subframe groups by the network side device, and each subframe group in the multiple subframe groups comprises one or more subframes.

31. The apparatus according to any one of claims 28-30, wherein the channel state information interference measurement resource is a channel state information-interference measurement (CSI-IM) resource configured based on a zero-power channel state information reference signal.

32. An apparatus for measuring channel state information (CSI), wherein the CSI measurement apparatus is located in a network side device and comprises:

a configuration element, configured to configure channel state information interference measurement resources for multiple subframe groups; and

a sending element, configured to send configuration information to a terminal device, wherein the configuration information is used for instructing the terminal device to execute interference measurement when a subframe where a channel state information interference measurement resource is located is a downlink subframe.

33. The apparatus according to claim 32, further comprising:

a grouping element, wherein the grouping element comprises;

a first grouping component, configured to determine, in a case of determining the multiple subframe groups in a semi-static manner, the multiple subframe groups in a period of multiple radio frames; and

a second grouping component, configured to determine, in a case of determining the multiple subframe groups in a dynamic manner, the multiple subframe groups in a period of one radio frame.

34. The apparatus according to claim 32 or 33, wherein the channel state information interference measurement resource is a channel state information-interference measurement (CSI-IM) resource configured based on a zero-power channel state information reference signal.