System and Method for Signaling Configuration of Sounding Reference Signals

• US 20130028134A1
• Filed: 09/20/2010
• Published: 01/31/2013
• Est. Priority Date: 03/31/2010
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Wang, Yuxin, Dai, Bo, Hao, Peng, Liang, Chunli, Yu, Bin, Zhu, Peng, Yang, Weiwei
• Granted Patent: US 8,717,938 B2
• Time in Patent Office: Days
• US Class Current: 370/254
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention discloses a method for a signaling configuration of a sounding reference signal. The method includes: a base station notifying a user equipment to aperiodically send the sounding reference signal, and sending configuration information of aperiodically sending the sounding reference signal (SRS) down to the user equipment. The present invention also discloses a base station for a signaling configuration of a sounding reference signal and a user equipment for a signaling configuration of a sounding reference signal. The present invention can realize that the user equipment aperiodically sends the SRS, which improves the utilization ratio of SRS resources and increases the flexibility of resource scheduling.

Claims

1. A method for a signaling configuration of a sounding reference signal, comprising:

a base station notifying a user equipment to aperiodically send the sounding reference signal, and sending configuration information of aperiodically sending the sounding reference signal (SRS) down to the user equipment.

9. The method according to claim 1, wherein, the step of sending the configuration information of aperiodically sending the sounding reference signal down to the user equipment comprises:

the base station carrying an indication information of aperiodically sending the sounding reference signal of the user equipment through a downlink control information, and configuring N resources or ways used for aperiodically sending the sounding reference signal for the user equipment through a high layers signaling;

wherein, N is an integer from 1 to 20.

10. The method according to claim 9, wherein,

each resource or way in the N resources or ways comprises one or more of the following information:

a cyclic shift information, a frequency domain location, a UE specific bandwidth, a location of a frequency comb, an SRS bandwidth configuration information, an SRS sending subframe, a periodic configuration information and a mode indication of sending the sounding reference signal.

11. The method according to claim 9, wherein,

for each equipment, when the user equipment occupies one uplink component carrier, k-bit is used to represent the indication information of aperiodically sending the sounding reference signal in the downlink control information, wherein the indication information indicates whether the equipment needs to aperiodically send the sounding reference signal on the corresponding uplink component carrier and which one of the N resources and ways is used to perform the sending;

when the user equipment occupies more than one uplink component carrier, the indication information of aperiodically sending the sounding reference signal on each uplink component carrier is indicated according to any one of the following ways;

(a) k-bit is used to represent the indication information of aperiodically sending the sounding reference signal in the downlink control information, wherein the indication information indicates whether the equipment needs to aperiodically send the sounding reference signal and which one of the N resources or ways is used to perform the sending, and when aperiodically sending the sounding reference signal on each uplink component carrier, the aperiodically sending the sounding reference signal is performed according to the indication information of k-bit;

(b) for each uplink component carrier, different indication information is used to indicate respectively, and each indication information is represented by a k-bit signaling, wherein the k-bit signaling indicates whether the equipment needs to aperiodically send the sounding reference signal on the corresponding uplink component carrier and which one of the N resources or ways is used to perform the sending;

wherein, k is an integer from 1 to 6.

12. The method according to claim 11, wherein,

a relationship between k and N is:

k=ceil(log₂(N+1)), and the ceil represents rounded up.

13. The method according to claim 11, wherein,

the indication information of aperiodically sending the sounding reference signal is carried on the UE specific downlink control information format (DCI Format) domain, or carried on a DCI Format domain dedicated to carry aperiodic sounding reference signal information.

14. The method according to claim 13, further comprising:

when the indication information of aperiodically sending the sounding reference signal of a same user equipment is carried on the UE specific DCI Format and the DCI Format dedicated for carrying the aperiodic sounding reference signal information in one subframe, the user equipment interpreting the indication information of aperiodically sending the sounding reference signal carried on the UE specific DCI Format.

15. The method according to claim 14, wherein,

the UE specific DCI Format comprises the UE specific DCI Format used for uplink scheduling and the UE specific DCI Format used for downlink allocation;

when the indication information of aperiodically sending the sounding reference signal of a same user equipment is carried on the UE specific DCI Format used for uplink scheduling and the UE specific DCI Format used for downlink allocation in one subframe, the user equipment interprets the indication information of aperiodically sending the sounding reference signal of the user equipment carried by any one of the UE specific DCI Formats.

20. The method according to claim 11, wherein,

the uplink component carrier is determined by the public RNTI and the initial location, wherein, different uplink component carriers correspond to different public RNTIs or initial locations.

21. The method according to claim 11, wherein,

the uplink component carrier is an uplink component carrier corresponding to a downlink component carrier where the PDSCH scheduled by the DCI format carrying the indication information locates, or, an uplink component carrier where the PUSCH scheduled by the DCI format carrying the indication information locates, or, an uplink component carrier corresponding to a downlink component carrier carrying the indication information.

22. The method according to claim 1, wherein, the step of sending the configuration information of aperiodically sending the sounding reference signal down to the user equipment comprises:

the base station, when sending a downlink control information down, indicating the user equipment whether to perform aperiodically sending the sounding reference signal and a mode of aperiodically sending the sounding reference signal; and

configuring and sending down other parameters required by aperiodically sending the sounding reference signal through a high layers signaling.

25. The method according to claim 22, wherein,

the mode of aperiodically sending the sounding reference signal comprises one or more of the following items:

sending the aperiodic sounding reference signal in the last orthogonal frequency division multiplexing (OFDM) symbol of the uplink subframe;

sending the aperiodic sounding reference signal in the last but one OFDM symbol of the uplink subframe;

not precoding a demodulation reference signal (DMRS) of the first time slot of the uplink subframe and/or a DMRS of the second time slot of the uplink subframe;

sending the aperiodic sounding reference signal in the last one and/or the last but one OFDM symbol of the uplink subframe, and wherein, a sending bandwidth equals to a bandwidth occupied by a physical uplink shared channel (PUSCH) of the user equipment, and a frequency domain location of sending is the same as a frequency domain location of the PUSCH; and

sending the sounding reference signal in the DMRS of the first time slot of the uplink subframe and the DMRS of the second time slot of the uplink subframe at the same time, and performing a code division multiplexing to the sent sounding reference signal and an uplink demodulation reference signal by adopting an orthogonal cover code.

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27. A base station for a signaling configuration of a sounding reference signal, configured to:

notify a user equipment to send an aperiodic sounding reference signal, and send configuration information of sending the sounding reference signal down to the user equipment,

so as to make the user equipment send the aperiodic sounding reference signal on a corresponding uplink component carrier.

28. The base station according to claim 27, wherein,

the base station is configured to send the configuration information of sending the sounding reference signal down to the user equipment according to the following way:

the base station sending the configuration information of aperiodically sending the sounding reference signal down to one or more user equipment through a physical downlink shared channel (PDSCH);

or

the base station is configured to send the configuration information of sending the sounding reference signal down to the user equipment according to the following way;

the base station carrying an indication information of aperiodically sending the sounding reference signal of the user equipment through a downlink control information, and configuring N resources or ways used for aperiodically sending the sounding reference signal for the user equipment through a high layers signaling;

or

the base station is configured to send the configuration information of sending the sounding reference signal down to the user equipment according to the following way;

the base station, when sending a downlink control information, indicating the user equipment whether to perform aperiodically sending the sounding reference signal and a mode of aperiodically sending the sounding reference signal; and

configuring and sending other parameters required by aperiodically sending the sounding reference signal through a high layers signaling.

30. The base station according to claim 28, wherein,

each resource or way in the N resources or ways comprises one or more of the following information:

a cyclic shift information, a frequency domain location, a UE specific bandwidth, a location of a frequency comb, an SRS bandwidth configuration information, an SRS sending subframe, a periodic configuration information and a mode indication of sending the sounding reference signal.

31. The base station according to claim 28, wherein,

for each equipment, when the user equipment occupies one uplink component carrier, k-bit is used to represent the indication information of aperiodically sending the sounding reference signal in the downlink control information, wherein the indication information indicates whether the equipment needs to aperiodically send the sounding reference signal on the corresponding uplink component carrier and which one of the N resources and ways is used to perform the sending;

when the user equipment occupies more than one uplink component carrier, the indication information of aperiodically sending the sounding reference signal on each uplink component carrier is indicated according to any one of the following ways;

(a) k-bit is used to represent the indication information of aperiodically sending the sounding reference signal in the downlink control information, wherein the indication information indicates whether the equipment needs to aperiodically send the sounding reference signal and which one of the N resources or ways is used to perform the sending, and when aperiodically sending the sounding reference signal on each uplink component carrier, the aperiodically sending the sounding reference signal is performed according to the indication information of k-bit;

(b) for each uplink component carrier, different indication information is used to indicate respectively, and each indication information is represented by a k-bit signaling, wherein the k-bit signaling indicates whether the equipment needs to aperiodically send the sounding reference signal on the corresponding uplink component carrier and which one of the N resources or ways is used to perform the sending;

wherein, k is an integer from 1 to 6; and

a relationship between k and N is;

k=ceil(log₂(N+1)), and the ceil represents rounded up.

32. The base station according to claim 31, wherein,

the indication information of aperiodically sending the sounding reference signal is carried on the UE specific downlink control information format (DCI Format) domain, or carried on a DCI Format domain dedicated to carry aperiodic sounding reference signal information.

29. A user equipment for a signaling configuration of a sounding reference signal, configured to:

receive a notification of sending an aperiodic sounding reference signal sent by a base station,

receive configuration information of sending the aperiodic sounding reference signal down to the user equipment sent by the base station, and

send the aperiodic sounding reference signal on a corresponding uplink component carrier.

33. The user equipment according to claim 29, wherein,

the notification of sending an aperiodic sounding reference signal comprises k-bit for representing the indication information of aperiodically sending the sounding reference signal in the downlink control information;

the configuration information comprises N resources or ways used for aperiodically sending the sounding reference signal for the user equipment through a high layers signaling;

each resource or way in the N resources or ways comprises one or more of the following information;

a cyclic shift information, a frequency domain location, a UE specific bandwidth, a location of a frequency comb, an SRS bandwidth configuration information, an SRS sending subframe, a periodic configuration information and a mode indication of sending the sounding reference signal.

34. The user equipment according to claim 33, wherein,

for each equipment, when the user equipment occupies one uplink component carrier, k-bit is used to represent the indication information of aperiodically sending the sounding reference signal in the downlink control information, wherein the indication information indicates whether the equipment needs to aperiodically send the sounding reference signal on the corresponding uplink component carrier and which one of the N resources and ways is used to perform the sending;

when the user equipment occupies more than one uplink component carrier, the indication information of aperiodically sending the sounding reference signal on each uplink component carrier is indicated according to any one of the following ways;

(a) k-bit is used to represent the indication information of aperiodically sending the sounding reference signal in the downlink control information, wherein the indication information indicates whether the equipment needs to aperiodically send the sounding reference signal and which one of the N resources or ways is used to perform the sending, and when aperiodically sending the sounding reference signal on each uplink component carrier, the aperiodically sending the sounding reference signal is performed according to the indication information of k-bit;

(b) for each uplink component carrier, different indication information is used to indicate respectively, and each indication information is represented by a k-bit signaling, wherein the k-bit signaling indicates whether the equipment needs to aperiodically send the sounding reference signal on the corresponding uplink component carrier and which one of the N resources or ways is used to perform the sending;

wherein, k is an integer from 1 to 6.