Method for controlling transmission power of sounding reference signal in wireless communication system and apparatus for same

Patent metadata

Field	Value
Publication number	US-9872259-B2
Application number	US-201414442351-A
Country	US
Kind code	B2
Filing date	Jun 23, 2014
Priority date	Jun 24, 2013
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

Disclosed in the present application is a method for transmitting a sounding reference signal (SRS) from a terminal to a base station in a time division duplex (TDD) system. More specifically, the method comprises: a step of establishing a first subframe set and a second subframe set through an upper layer, and step of transmitting the sounding reference signal from a specific subframe to the base station, wherein the first subframe set and the second subframe set are configured by an uplink subframe and/or a special subframe, each of the first subframe and the second subframe is associated with a power control process for transmitting an uplink data channel, and wherein the transmission power of the sounding reference signal is determined on the basis of a specific power control process associated with a subframe set to which the specific subframe belongs, from among the first subframe set and the second subframe set.

First claim

The invention claimed is:

1. A method for transmitting, by a user equipment (UE), a sounding reference signal (SRS) to a base station in a time division duplex (TDD) communication system, the method comprising:
configuring a first subframe set and a second subframe set based on a RRC (Radio Resource Control) signaling;
determining a transmission power of the SRS based on at least P CMAX,c (i), P SRS-OFFSET,c (m), M SRS,c , and f c (i) for the first subframe set, and P CMAX,c (i), P SRS-OFFSET,c (m), M SRS,c , and f c (0) (i) for the second subframe set,
wherein P CMAX,c (i) is a configured UE transmit power in subframe ‘i’, P SRS-OFFSET,c (m) is a parameter configured for ‘m=0 or 1’, M SRS,c is a bandwidth of the SRS transmission, f c (i) is a current Physical Uplink Shared Channel (PUSCH) power control adjustment state for serving cell ‘c’ in subframe ‘i’ belonging to the first subframe set, and f c (0) (i) is a current PUSCH power control adjustment state for serving cell ‘c’ in subframe ‘i’ belonging to the second subframe set, and
wherein f c (i) is separately accumulated from a value of a previous subframe belonging to the first subframe set while f c (0) (i) is separately accumulated from a value of a previous subframe belonging to the second subframe set; and
transmitting the SRS using the determined transmission power of the SRS to the base station.

2. The method according to claim 1 ,
wherein each of the first subframe set and the second subframe set include at least one of an uplink subframe and a special subframe.

3. The method according to claim 1 , further comprising:
receiving configuration information about the first subframe set and the second subframe set from the base station.

4. A method for receiving, by a base station, a sounding reference signal (SRS) from a user equipment (UE) in a time division duplex (TDD) communication system, the method comprising:
configuring a first subframe set and a second subframe set through a higher layer; and
receiving the SRS from the UE on a specific subframe,
wherein a transmission power of the SRS is determined by the UE based on at least P CMAX,c (i), P SRS _ OFFSET,c (m), M SRS,c , and f c (i) for the first subframe set, and P CMAX,c (i), P SRS _ OFFSET,c (m), M SRS,c ,and f c (0) (i) for the second subframe set,
wherein P CMAX,c (i) is a configured UE transmit power in subframe ‘i’, P SRS _ OFFSET,c (m) is a parameter configured for ‘m=0 or 1’, M SRS,c is a bandwidth of the SRS transmission, f c (i) is a current Physical Uplink Shared Channel (PUSCH) power control adjustment state for serving cell ‘c’ in subframe ‘i’ belonging to the first subframe set, and f c (0) (i) is a current PUSCH power control adjustment state for serving cell ‘c’ in subframe ‘i’ belonging to the second subframe set, and
wherein f c (i) is separately accumulated from a value of a previous subframe belonging to the first subframe set while f c (0) (i) is separately accumulated from a value of a previous subframe belonging to the second subframe set.

5. The method according to claim 4 ,
wherein each of the first subframe set and the second subframe set include at least one of an uplink subframe and a special subframe.

6. The method according to claim 4 , further comprising:
transmitting configuration information about the first subframe set and the second subframe set to the UE.

Assignees

• Lg Electronics Inc

Inventors

• Park Jonghyun
• Seo Hanbyul
• Lee Seungmin

Classifications

• H04L5/1469

  using time-sharing · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04W52/146

  Uplink power control · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04B7/2656

  for structure of frame, burst · CPC title