Method and device for transmitting random access and other uplink channels of other cell in mobile communication system carrier aggregation

• US 9,288,801 B2
• Filed: 04/05/2012
• Issued: 03/15/2016
• Est. Priority Date: 04/05/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jeong, Kyeong In, Van Lieshout, Gert Jan
• Primary Examiner(s): Marcelo, Melvin
• Assistant Examiner(s): Solinsky, Peter
• Application Number:
  US14/110,133
• Publication Number:
  US 20140023030A1
• Time in Patent Office: 1,440 Days
• Field of Search: 370/329
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 1/1851 using multiple timers
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 1/1883 using multiple timers
• CPC Class Codes: H04L 27/2662 Symbol synchronisation
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 56/005 : compensating for timing error by adjustment in the receiver
• CPC Class Codes: H04W 72/00 : Local resource management
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 : Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/21 : in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/006 : in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 : Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/085 : collision avoidance
• CPC Class Codes: H04W 74/0858 : collision detection
• CPC Class Codes: H04W 74/0891 : for synchronized access
• CPC Class Codes: H04W 76/19 : Connection re-establishment
• CPC Class Codes: H04W 76/38 : triggered by timers
• CPC Class Codes: H04W 84/042 : Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

The present invention relates to a transmission of a random access in a specific cell from a plurality of serving cells in a mobile communication system using a carrier aggregation technology, and a method for efficiently transmitting uplink channels other than the random access in another cell. In particular, the method for a terminal to transmit an uplink channel to a base station comprises the steps of: confirming whether an uplink channel for a second carrier having an uplink timing different from a first carrier is included in a subframe transmitting a Random Access Preamble for the first carrier; if included, confirming whether the sum of the electric power required for the transmission of the random access preamble and the electric power required for the transmission of the uplink channel exceeds the maximum transmission electric power of the terminal; and, if exceeding, transmitting the random access preamble preferentially before the uplink channel. In addition, the terminal for transmitting an uplink channel to a base station comprises: a transmitter/receiver for transmitting/receiving a signal to/from the base station; and a control unit for confirming whether the uplink channel for a second carrier having an uplink timing different from a first carrier is included in a subframe for transmitting a random access preamble for the first carrier, and if included, confirming whether the sum of the electric power required for transmitting the Random Access Preamble and the electric power required for transmitting the uplink channel exceeds the maximum transmission electric power of the terminal, and if exceeding, controlling the transmission so that the random access preamble is preferentially transmitted before the uplink channel.

Claims

1. A method for transmitting uplink information by a terminal in a wireless communication system, the method comprising:

configuring multiple timing advance groups (TAGs) for at least two serving cells;

determining whether a transmission of a random access preamble on a first serving cell belonging to a first TAG and a transmission of an uplink signal on a second serving cell belonging to a second TAG occur in a same symbol;

determining whether a total transmission power required for transmitting the random access preamble and the uplink signal exceeds a maximum terminal output power, if the transmission of the random access preamble and the transmission of the uplink signal occur in the same symbol; and

transmitting the random access preamble on the first serving cell, if the total transmission power exceeds the maximum terminal output power.

2. The method of claim 1, further comprising dropping the transmission of the uplink on the serving cell.

3. The method of claim 1, further comprising:

adjusting a transmission power of the uplink signal on the second serving cell; and

transmitting the uplink signal on the second serving cell with the adjusted transmission power.

4. The method of claim 3, wherein the transmission power of the uplink signal on the second serving cell is adjusted not to exceed the maximum terminal output power.

5. The method of claim 2, wherein the transmission of the uplink signal on the second serving cell is dropped, if the uplink signal on the second serving cell includes a sounding reference signal (SRS).

6. The method of claim 3, wherein the transmission power of the uplink signal on the second serving cell is adjusted, if the uplink signal on the second serving cell includes one of a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

7. A terminal for transmitting uplink information to a base station in a wireless communication system, the terminal comprising:

a transceiver configured to transmit and receive a signal; and

a control unit configured to;

configure multiple timing advance groups (TAGs) for at least two serving cells;

determine whether a transmission of a random access preamble on a first serving cell belonging to a first TAG and a transmission of an uplink signal on a second serving cell belonging to a second TAG occur in a same symbol;

determine whether a total transmission power required for transmitting the random access preamble and the uplink signal exceeds a maximum terminal output power, if the transmission of the random access preamble and the transmission of the uplink signal occur in the same symbol; and

control the transceiver to transmit the random access preamble on the first serving cell, if the total transmission power exceeds the maximum terminal output power.

8. The terminal of claim 7, wherein the control unit is configured to drop the transmission of the uplink signal on the second serving cell.

9. The terminal of claim 7, wherein the control unit is configured to control transmitting the uplink channel with priority as compared to the random access preamble.

10. The terminal of claim 9, wherein the control unit is configured to adjust a transmission power of the uplink signal on the second serving cell and to transmit the uplink signal on the second serving cell with the adjusted transmission power.

11. The terminal of claim 8, wherein the transmission of the uplink signal on the second serving cell is dropped, if the uplink signal on the different serving cell includes a sounding reference signal (SRS).

12. The terminal of claim 9, wherein the transmission power of the uplink signal on the second serving cell is adjusted, if the uplink signal on the second serving cell includes one of a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).