Apparatus and method for transmission of sounding reference signal in uplink wireless communication systems with multiple antennas and sounding reference signal hopping

• US 9,722,681 B2
• Filed: 07/02/2015
• Issued: 08/01/2017
• Est. Priority Date: 06/20/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ro, Sang Min, Han, Jin Kyu, Cho, Joon Young, Lee, Ju Ho, Li, Yingyang
• Primary Examiner(s): Gidado, Rasheed
• Application Number:
  US14/790,353
• Publication Number:
  US 20150304006A1
• Time in Patent Office: 761 Days
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 2201/698 relating to Uplink
• CPC Class Codes: H04B 7/0608 Antenna selection according to transmission parameters
• CPC Class Codes: H04B 7/0684 using different training sequences per antenna
• CPC Class Codes: H04B 7/0897 using beamforming per multi-path, e.g. to cope with different directions of arrival [DOA] at different multi-paths
• CPC Class Codes: H04J 13/0074 Code shifting or hopping
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• 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: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

Disclosed is a sounding reference signal transmission method which is efficient in an uplink wireless telecommunications system using a multiple antenna technique and sounding reference signal hopping. A terminal is equipped with a plurality of antennas, and a base station receives the sounding reference signal transmitted from these antennas and estimates the uplink channel state of each antenna. The sounding reference signal performs frequency hopping so that the base station determines the channel condition for the entire bandwidth to which data is transmitted in the uplink system. In this environment, the sounding reference signal is transmitted through an antenna pattern through the entire data transmission bandwidth of the uplink system for each antenna of the terminal without additional overhead.

Claims

1. A method of sounding reference signal (SRS) transmission in a user equipment (UE) in a communications system supporting multiple antennas and SRS hopping, the method comprising:

identifying a transmission time of the SRS;

setting a transmission band for transmitting the SRS;

generating the SRS to be transmitted to a base station;

determining an antenna index for transmitting the SRS; and

transmitting the SRS to the base station according to the antenna index,

wherein the antenna index is determined by a function based on the transmission time, a UE-specific parameter for an SRS bandwidth and a frequency hopping parameter of the SRS.

2. The method of claim 1,

wherein the antenna index is generated by a following set of equations:

3. The method of claim 1,

wherein the antenna index is 0110, and

wherein 0 of the antenna index 0110 is an index of a first antenna and 1 of the antenna index 0110 is an index of a second antenna.

4. The method of claim 3, wherein the antenna index 0110 and an antenna index that is a complementary form of the antenna index 0110 are alternately repeated, when the number of transmission bands is a multiple of 4.

5. The method of claim 1,

wherein the antenna index is 01 when the number of transmission bands is an odd number, and

wherein 0 of the antenna index 01 is an index of a first antenna and 1 of the antenna index 10 is an index of a second antenna.

6. A method of sounding reference signal (SRS) reception in a base station in a communications system supporting multiple antennas and SRS hopping, the method comprising:

identifying an SRS reception time;

receiving the SRS through a predetermined transmission band at the SRS reception time; and

determining which antenna of a user equipment (UE) transmitted the SRS by supporting an antenna index,

wherein the antenna index is determined by a function based on a transmission time, a UE specific parameter for an SRS bandwidth and a frequency hopping parameter of the SRS.

7. The method of claim 6,

wherein the antenna index is generated by a following set of equations:

8. The method of claim 6,

wherein the antenna index is 0110, and

wherein 0 of the antenna index 0110 is an index of a first antenna and 1 of the antenna index 0110 is an index of a second antenna.

9. The method of claim 8, wherein an antenna index 0110 and an antenna index that is a complementary form of the antenna index 0110 are alternately repeated, when the number of transmission bands is a multiple of 4.

10. The method of claim 6,

wherein the antenna index is 01 when the number of transmission bands is an odd number, and

wherein 0 of the antenna index 01 is an index of a first antenna and 1 of the antenna index 01 is an index of a second antenna.

11. An apparatus for transmitting a sounding reference signal (SRS) in a mobile communications system supporting multiple antennas and SRS hopping, the apparatus comprising:

an SRS hopping generator for identifying a transmission time and setting a transmission band for transmitting the SRS;

an SRS sequence generator for generating an SRS to be transmitted to a base station;

an SRS transmit antenna index generator for determining an antenna index for transmitting the SRS; and

an SRS transmit antenna selector for transmitting the SRS to the base station according to the antenna index,

wherein the antenna index is determined by a function based on the transmission time, a UE specific parameter for an SRS bandwidth and a frequency hopping parameter of the SRS.

12. The apparatus of claim 11,

wherein the antenna index is generated by a following set of equations:

13. The apparatus of claim 11,

wherein the antenna index is 0110, and

wherein 0 of the antenna index 0110 is an index of a first antenna and 1 of the antenna index 0110 is an index of a second antenna.

14. The apparatus of claim 13, wherein the antenna index 0110 and an antenna index that is a complementary form of the antenna index 0110 are alternately repeated, when the number of transmission bands is a multiple of 4.

15. The apparatus of claim 11,

wherein the antenna index is 01 when the number of transmission band is an odd number, and

wherein 0 of the antenna index 01 is an index of a first antenna and 1 of the antenna index 01 is an index of a second antenna.

16. An apparatus for receiving a sounding reference signal (SRS) in a mobile communications system supporting multiple antennas and SRS hopping, the apparatus comprising:

a communication unit for receiving the SRS through a predetermined transmission band at an SRS reception time; and

an SRS transmit antenna decision unit for determining which antenna of a user equipment (UE) transmitted the SRS by supporting an antenna index,

wherein the antenna index is determined by a function based on a transmission time, a UE-specific parameter for an SRS bandwidth and a frequency hopping parameter of the SRS.

17. The apparatus of claim 16,

wherein the antenna index is generated by a following set of equations:

18. The apparatus of claim 16,

wherein the antenna index is 0110, and

wherein 0 of the antenna index 0110 is an index of a first antenna and 1 of the antenna index 0110 is an index of a second antenna.

19. The apparatus of claim 18, wherein the antenna index 0110 and an antenna index that is a complementary form of the antenna index 0110 are alternately repeated, when the number of transmission bands is a multiple of 4.

20. The apparatus of claim 16,

wherein the antenna index is 01 when the number of transmission bands is an odd number, and

wherein 0 of the antenna index 01 is an index of a first antenna and 1 of the antenna index 01 is an index of a second antenna.