Method and apparatus of configuring downlink timing and transmitting random access response in mobile communication system using carrier aggregation

• US 8,964,793 B2
• Filed: 04/05/2012
• Issued: 02/24/2015
• Est. Priority Date: 04/05/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Jang, Jaehyuk, Jeong, Kyeongin
• Primary Examiner(s): Zhou, Yong
• Application Number:
  US13/440,195
• Publication Number:
  US 20120257569A1
• Time in Patent Office: 1,055 Days
• US Class Current: 370/509
• 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

A method of configuring downlink timings and transmitting a random access response message is provided for a random access procedure in a Long Term Evolution (LTE) system supporting carrier aggregation. The method for adjusting timing of a terminal in a wireless communication system supporting carrier aggregation of at least one carrier includes transmitting a Random Access Preamble to a base station, and receiving a Random Access Response with a Timing Advance Command (TAC) for commanding uplink timing adjustment from the base station, wherein the Random Access Response comprises information indicating a Timing Advance Group (TAG) to which the TAC is applied.

Claims

1. A method for adjusting timing of a terminal in a wireless communication system supporting carrier aggregation of at least one carrier, the method comprising:

transmitting a Random Access Preamble corresponding to a random access preamble transmitted to a primary cell of a base station to a secondary cell of the base station;

receiving a Random Access Response with a Timing Advance Command (TAC) for commanding uplink timing adjustment from the base station, wherein the Random Access Response comprises information indicating a Timing Advance Group (TAG) to which the TAC is applied;

identifying the TAG for applying the TAC among TAG of the primary cell or TAG of the secondary cell based on the information; and

adjusting the uplink timing by applying the uplink TAC to at least one cell included in the identified TAG.

2. The method of claim 1, wherein the Random Access Response comprises the information on at least one TAG with the TAC per TAG.

3. The method of claim 1, further comprising:

identifying reference downlink for adjusting the uplink timing among downlink of the primary cell or downlink of the secondary cell based on the information,

wherein the uplink timing of the at least one cell is adjusted based on the identified reference downlink.

4. The method of claim 1, wherein the adjusting the uplink timing is performed when a Timing Advance Command Medium Access Control (MAC) Control Element (TAC MAC CE) is received, the TAC MAC CE includes information on a separate TAC and TAG to which the TAC is applied.

5. The method of claim 1, further comprising adjusting, before transmitting a Random Access Preamble, transmission timing of the Random Access Preamble based on a carrier on which the terminal has succeeded transmission of the Random Access Preamble or a carrier to which channel information for transmitting the Random Access Preamble is configured.

6. A method for adjusting timing of a base station in a wireless communication system supporting carrier aggregation of at least one carrier, the method comprising:

receiving a Random Access Preamble corresponding to a random access preamble received from a terminal via a primary cell of the base station from the terminal via a secondary cell of the base station; and

transmitting a Random Access Response with a Timing Advance Command (TAC) for commanding uplink timing adjustment to the terminal, wherein the Random Access Response comprises information indicating a Timing Advance Group (TAG) to which the TAC is applied,

wherein the information is used for identifying the TAG for applying the TAC among TAG of the primary cell or TAG of the secondary cell by the terminal.

7. The method of claim 6, wherein the Random Access Response comprises information on at least one TAG with the TAC per TAG.

8. The method of claim 7, further comprising transmitting, after transmitting a Random Access Response, a Timing Advance Command Medium Access Control (MAC) Control Element (TAC MAC CE) including information on a separate TAC and TAG to which the TAC is applied, when additional adjustment of the uplink timing is needed.

9. The method of claim 6, wherein the information is used for identifying reference downlink for adjusting the uplink timing among downlink of the primary cell or downlink of the secondary cell based on the information by the UE.

10. A terminal for adjusting transmission/reception timing of a signal in a wireless communication system supporting carrier aggregation of at least one carrier, the terminal comprising:

a transceiver for communicating signals with a base station; and

a controller for transmitting a Random Access Preamble corresponding to a random access preamble transmitted to a primary cell of the base station to a secondary cell of the base station, for receiving a Random Access Response with a Timing Advance Command (TAC) for commanding uplink timing adjustment from the base station, for identifying the TAG of the secondary cell based on information, and for adjusting the uplink timing by applying the uplink TAC to at least one cell included in the identified TAG,

wherein the Random Access Response comprises the information indicating a Timing Advance Group (TAG) to which the TAC is applied.

11. The terminal of claim 10, wherein the Random Access Response comprises the information on at least one TAG with the TAC per TAG.

12. The terminal of claim 11, wherein the controller identifies reference downlink for adjusting the uplink timing among downlink of the primary cell or downlink of the secondary cell based on the information,

wherein the uplink timing of the at least one cell is adjusted based on the identified reference downlink.

13. The terminal of claim 10, wherein the controller receives a Timing Advance Command Medium Access Control (MAC) Control Element (TAC MAC CE) including information on a separate TAC and TAG to which the TAC is applied and adjusts the uplink timing by applying the TAC to the at least one carrier belonging to the TAG.

14. The method of claim 10, wherein the controller adjusts transmission timing of the Random Access Preamble based on a carrier on which the terminal has succeeded transmission of the Random Access Preamble or a carrier to which channel information for transmitting the Random Access Preamble is configured.

15. A base station for adjusting transmission/reception timing of a signal in a wireless communication system supporting carrier aggregation of at least one carrier, the base station comprising:

a transceiver for communicating signals with a terminal; and

a controller for receiving a Random Access Preamble corresponding to a random access preamble received from a terminal via a primary cell of the base station from the terminal via a secondary cell of the base station, and for transmitting a Random Access Response with a Timing Advance Command (TAC) for commanding uplink timing adjustment to the terminal, wherein the Random Access Response comprises information indicating a Timing Advance Group (TAG) to which the TAC is applied,

wherein the information is used for identifying the TAG for applying the TAC among TAG of the primary cell or TAG of the secondary cell by the terminal.

16. The base station of claim 15, wherein the Random Access Response comprises information on at least one TAG with the TAC per TAG.

17. The base station of claim 16, wherein the controller transmits a Timing Advance Command Medium Access Control (MAC) Control Element (TAC MAC CE) including information on a separate TAC and TAG to which the TAC is applied when additional adjustment of the uplink timing is needed.

18. The base station of claim 15, wherein the information is used for identifying reference downlink for adjusting the uplink timing among downlink of the primary cell or downlink of the secondary cell based on the information by the UE.