Method, system, and apparatus for determining uplink transmission power in time division duplex system

• US 8,526,338 B2
• Filed: 04/27/2009
• Issued: 09/03/2013
• Est. Priority Date: 04/25/2008
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: Pan, Xueming, Suo, Shiqiang, Xiao, Guojun, Ding, Yu
• Primary Examiner(s): Jiang, Charles C
• Application Number:
  US12/989,141
• Publication Number:
  US 20110267994A1
• Time in Patent Office: 1,590 Days
• Field of Search: 370310-350
• US Class Current: 370/280
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/248 where transmission power control commands are generated based on a path parameter
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure

Abstract

A method for determining uplink transmission power in time division duplex system is disclosed: a base station determines the current distribution manner of uplink and downlink sub-frames, acquires the frame correspondence information that corresponds to the distribution manner of said uplink and downlink sub-frames, selects, based on said frame correspondence information, downlink sub-frames to transmit to a terminal the power control (TPC) commands that correspond to the uplink sub-frames. Before using the uplink sub-frames to transmit data, the terminal determines the current distribution manner of uplink and downlink sub-frames, acquires the frame correspondence information that corresponds to the distribution manner of said uplink and downlink sub-frames, determines, based on the frame correspondence information, the downlink sub-frames that are used for transmitting the TPC commands; acquires the TPC commands received by the downlink sub-frames, and determines the data transmission power of the uplink sub-frames based on said TPC commands. The present invention also discloses a time division duplex data transmission system and an apparatus therefor. With the present invention, a time division duplex system can transmit and receive TPC commands based on the frame correspondence information, thereby enabling correct and effective uplink power control performance.

Claims

1. A method for determining uplink transmission power in a Time Division Duplex system, comprising:

determining, by a User Equipment, a current uplink and downlink sub-frame allocation mode before transmitting data using an uplink sub-frame, obtaining a sub-frame mapping corresponding to the uplink and downlink sub-frame allocation mode, determining a downlink sub-frame used by a base station for transmitting a Transmission Power Control, TPC, command corresponding to the uplink sub-frame according to the sub-frame mapping, obtaining the TPC command received through the determined downlink sub-frame, and determining power for data transmission via the uplink sub-frame according to the TPC command;

wherein, the TPC command corresponding to the uplink sub-frame is transmitted by the base station through the downlink sub-frame after the base station determines the current uplink and downlink sub-frame allocation mode, obtains the sub-frame mapping corresponding to the uplink and downlink sub-frame allocation mode, and determines the downlink sub-frame used for transmitting the TPC command corresponding to the uplink sub-frame according to the sub-frame mapping;

wherein the sub-frame mapping comprises a mapping relationship between an uplink sub-frame and a downlink sub-frame to be used for transmitting a TPC command corresponding to the uplink sub-frame; and

if the mapping relationship between an uplink sub-frame and a downlink sub-frame to be used for transmitting a TPC command corresponding to the uplink sub-frame is a mapping relationship between an identifier of the uplink sub-frame and an identifier of the downlink sub-frame, then determining the downlink sub-frame used for transmitting the TPC command corresponding to the uplink sub-frame according to the sub-frame mapping comprises;

obtaining an identifier of the uplink sub-frame, determining a downlink sub-frame identifier corresponding to the identifier of the uplink sub-frame according to the mapping relationship, and determining a downlink sub-frame corresponding to the downlink sub-frame identifier ahead of the uplink sub-frame as the downlink sub-frame used for transmitting the TPC command.

2. The method of claim 1, wherein,

if the mapping relationship between an uplink sub-frame and a downlink sub-frame to be used for transmitting a TPC command corresponding to the uplink sub-frame is a mapping relationship between an identifier of the uplink sub-frame and a value of a delay of TPC controlling the size of which is a time interval between the uplink sub-frame and the downlink sub-frame, then determining the downlink sub-frame used for transmitting the TPC command corresponding to the uplink sub-frame according to the sub-frame mapping comprises:

obtaining an identifier of the uplink sub-frame, determining a value of the delay of TPC controlling corresponding to the identifier of the uplink sub-frame according to the mapping relationship, and determining a downlink sub-frame ahead of the uplink sub-frame by a time interval of a size of the deteimined value of the delay of TPC controlling as the downlink sub-frame used for transmitting the TPC command.

3. The method of claim 2, wherein if a delay caused by the processing of the downlink control signaling by the User Equipment is 3 ms, the mapping relationship between the identifier of the uplink sub-frame and the value of the delay of TPC controlling lies in that:

if an uplink and downlink sub-frame allocation mode 0 is employed, the value of the delay of TPC controlling corresponding to an uplink sub-frame 2 is 6 or 7, the value of the delay of TPC controlling corresponding to an uplink sub-frame 3 is 7, the value of the delay of TPC controlling corresponding to an uplink sub-frame 4 is 4, the value of the delay of TPC controlling corresponding to an uplink sub-frame 7 is 6 or 7, the value of the delay of TPC controlling corresponding to an uplink sub-frame 8 is 7, and the value of the delay of TPC controlling corresponding to an uplink sub-frame 9 is 4;

if an uplink and downlink sub-frame allocation mode 1 is employed, the value of the delay of TPC controlling corresponding to the uplink sub-frame 2 is 6, the value of the delay of TPC controlling corresponding to the uplink sub-frame 3 is 4, the value of the delay of TPC controlling corresponding to the uplink sub-frame 7 is 6, and the value of the delay of TPC controlling corresponding to the uplink sub-frame 8 is 4;

if an uplink and downlink sub-frame allocation mode 2 is employed, the value of the delay of TPC controlling corresponding to the uplink sub-frame 2 is 4, and the value of the delay of TPC controlling corresponding to the uplink sub-frame 7 is 4;

if an uplink and downlink sub-frame allocation mode 3 is employed, the value of the delay of TPC controlling corresponding to the uplink sub-frame 2 is 4, the value of the delay of TPC controlling corresponding to the uplink sub-frame 3 is 4, and value of the delay of TPC controlling corresponding to the uplink sub-frame 4 is 4;

if an uplink and downlink sub-frame allocation mode 4 is employed, the value of the delay of TPC controlling corresponding to the uplink sub-frame 2 is 4, and the value of the delay of TPC controlling corresponding to the uplink sub-frame 3 is 4;

if an uplink and downlink sub-frame allocation mode 5 is employed, the value of the delay of TPC controlling corresponding to the uplink sub-frame 2 is 4; and

if an uplink and downlink sub-frame allocation mode 6 is employed, the value of the delay of TPC controlling corresponding to the uplink sub-frame 2 is 7, the value of the delay of TPC controlling corresponding to the uplink sub-frame 3 is 7, the value of the delay of TPC controlling corresponding to the uplink sub-frame 4 is 5, the value of the delay of TPC controlling corresponding to the uplink sub-frame 7 is 7, and the value of the delay of TPC controlling corresponding to the uplink sub-frame 8 is 7.

4. The method of claim 3, wherein when the uplink and downlink sub-frame allocation mode 0 is employed, if the uplink sub-frame 2 is a first one of two continuous uplink sub-frames subjected to multiple frame schedule, the value of the TPC downlink controlled delay parameter corresponding to the uplink sub-frame 2 is 6, otherwise, the value of the TPC downlink controlled delay parameter corresponding to the uplink sub-frame 2 is 7;

and if the uplink sub-frame 7 is a first one of two continuous uplink'"'"'sub-frames subjected to multiple frame schedule, the value of the TPC downlink controlled delay parameter corresponding to the uplink sub-frame 7 is 6, otherwise, the value of the TPC downlink controlled delay parameter corresponding to the uplink sub-frame 7 is 7.

5. The method of claim 2, wherein, the mapping relationship between the identifier of the uplink sub-frame and the value of the delay of TPC controlling is:

a one-to-one mapping relationship and/or a one-to-multiple mapping relationship.

6. The method of claim 1, wherein,

the mapping relationship between the identifier of the uplink sub-frame and the identifier of the downlink sub-frame is any one of:

a one-to-one mapping relationship, a one-to-multiple mapping relationship and a multiple-to-one mapping relationship.

7. The method of claim 1, wherein if a delay caused by the processing of the downlink control signaling by the User Equipment is 3 ms, the mapping relationship between the identifier of the uplink sub-frame and the identifier of the downlink sub-frame lies in that:

if an uplink and downlink sub-frame allocation mode 0 is employed, an uplink sub-frame 2 corresponds to a downlink sub-frame 5 or a special sub-frame 6, an uplink sub-frame 3 corresponds to a special sub-frame 6, an uplink sub-frame 4 corresponds to a downlink sub-frame 0, an uplink sub-frame 7 corresponds to the downlink sub-frame 0 or a special sub-frame 1, an uplink sub-frame 8 corresponds to the special sub-frame 1, and an uplink sub-frame 9 corresponds to the downlink sub-frame 5;

if an uplink and downlink sub-frame allocation mode 1 is employed, the uplink sub-frame 2 corresponds to the special sub-frame 6, the uplink sub-frame 3 corresponds to the downlink sub-frame 9, the uplink sub-frame 7 corresponds to the special sub-frame 1, and the uplink sub-frame 8 corresponds to the downlink sub-frame 4;

if an uplink and downlink sub-frame allocation mode 2 is employed, the uplink sub-frame 2 corresponds to the downlink sub-frame 8, and the uplink sub-frame 7 corresponds to the downlink sub-frame 3;

if an uplink and downlink sub-frame allocation mode 3 is employed, the uplink sub-frame 2 corresponds to the downlink sub-frame 8, the uplink sub-frame 3 corresponds to the downlink sub-frame 9, and the uplink sub-frame 4 corresponds to the downlink sub-frame 0;

if an uplink and downlink sub-frame allocation mode 4 is employed, the uplink sub-frame 2 corresponds to the downlink sub-frame 8, and the uplink sub-frame 3 corresponds to the downlink sub-frame 9;

if an uplink and downlink sub-frame allocation mode 5 is employed, the uplink sub-frame 2 corresponds to the downlink sub-frame 8; and

if an uplink and downlink sub-frame allocation mode 6 is employed, the uplink sub-frame 2 corresponds to the downlink sub-frame 5, the uplink sub-frame 3 corresponds to the special sub-frame 6, the uplink sub-frame 4 corresponds to the downlink sub-frame 9, the uplink sub-frame 7 corresponds to the downlink sub-frame 0, and the uplink sub-frame 8 corresponds to the special sub-frame 1.

8. The method of claim 7, wherein when the uplink and downlink sub-frame allocation mode 0 is employed, if the uplink sub-frame 2 is a second one of two continuous uplink sub-frames subjected to multiple frame schedule, the uplink sub-frame 2 corresponds to the downlink sub-frame 5, otherwise, the uplink sub-frame 2 corresponds to the special sub-frame 6;

and if the uplink sub-frame 7 is a second one of two continuous uplink sub-frames subjected to the multiple frame schedule, the uplink sub-frame 7 corresponds to the downlink sub-frame 0, otherwise, the uplink sub-frame 7 corresponds to the special sub-frame 1.

9. The method of claim 1, wherein, a time interval between the uplink sub-frame and the downlink sub-frame determined according to the sub-frame mapping is more than or equal to a delay caused by the processing of the downlink control signaling by the User Equipment.