RANDOM ACCESS METHOD AND APPARATUS OF UE IN MOBILE COMMUNICATION SYSTEM

• US 20120176967A1
• Filed: 01/11/2012
• Published: 07/12/2012
• Est. Priority Date: 01/11/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Soeng Hun, NG, Boon Loong, Van LIESHOUT, Gert-Jan, JEONG, Kyeong In, CHO, Joon Young
• Granted Patent: US 8,761,047 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0085 when channel conditions change
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/38 TPC being performed in particular situations
• CPC Class Codes: H04W 72/00 Local resource management
• 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 72/566 : of the information or information source or recipient
• CPC Class Codes: H04W 74/08 : Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0833 : Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/11 : Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/36 : for reassigning the resources associated with the released connections
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

A method and an apparatus for performing random access and uplink transmission of a User Equipment (UE) supporting Carrier Aggregation (CA) are provided. The method includes determining whether a Scheduling Request (SR) is pending, determining, when the SR is pending, whether an uplink transmission resource is available in a current Transmission Time Interval (TTI), determining, when the uplink transmission resource is not available, whether a Physical Uplink Control Channel (PUCCH) resource is configured for transmission of the SR, and initiating, when the PUCCH resource is not configured, a random access process in a primary cell. The random access method and apparatus of the present invention is advantageous to reduce the waste of transmission resources.

Claims

1. A random access method of a terminal, the method comprising:

determining whether a Scheduling Request (SR) is pending;

determining, when the SR is pending, whether an uplink transmission resource is available in a current Transmission Time Interval (TTI);

determining, when the uplink transmission resource is not available, whether a Physical Uplink Control Channel (PUCCH) resource is configured for transmission of the SR; and

initiating, when the PUCCH resource is not configured, a random access process in a primary cell.

2. The method of claim 1, further comprising:

determining, when the PUCCH resource is configured, whether the PUCCH resource is configured for transmitting the SR in the current TTI, whether the current TTI is not a part of a measurement gap and whether a timer is not running;

comparing, when the PUCCH resource is configured for transmitting of the SR in the current TTI and the current TTI is not a part of measurement gap and a timer is not running, an SR transmission times counter with a preset maximum SR transmission value; and

releasing, when the SR transmission times counter is equal to or greater than a preset maximum SR transmission value, the PUCCH and SRS transmission resources.

3. The method of claim 2, further comprising initiating, when the SR transmission times counter is equal to or greater than the maximum SR transmission value, the random access process in the primary cell.

6. The method of claim 1, wherein the determining of whether the SR is pending comprises determining the SR triggered but not cancelled is the SR pending.

7. The method of claim 6, further comprising:

triggering, when a Buffer Status Report (BSR) is triggered, the SR; and

canceling, when the BSR is included in a Media Access Control Packet Data Unit (MAC PDU), the SR.

4. The method of claim 4, further comprising signaling, when the SR transmission times counter is less than the maximum SR transmission value, the SR through the PUCCH.

5. The method of claim 4, further comprising:

incrementing, when the SR transmission times counter is less than the maximum SR transmission value, the SR transmission times counter by 1; and

starting, when the SR transmission times counter is less than the maximum SR transmission value, the timer.

8. A terminal for performing random access, the terminal comprising:

a controller for determining whether a Scheduling Request (SR) is pending, for determining, when the SR is pending, whether an uplink transmission resource is available in a current Transmission Time Interval (TTI), for determining, when the uplink transmission resource is not available, whether a Physical Uplink Control Channel (PUCCH) resource is configured for transmission of the SR, and for initiating, when the PUCCH resource is not configured, a random access process in a primary cell.

9. The terminal of claim 8, wherein the controller determines, when the PUCCH resource is configured, whether the PUCCH resource is configured for transmitting the SR in the current TTI and whether the current TTI is not a part of a measurement gap and whether a timer is not running, compares, when the PUCCH resource is configured for transmitting of the SR in the current TTI and the current TTI is not a part of the measurement gap and the timer is not running, an SR transmission times counter with a preset maximum SR transmission value, and releases, when the SR transmission times counter is equal to or greater than a preset maximum SR transmission value, the PUCCH and SRS transmission resources.

10. The terminal of claim 8, wherein the controller initiates, when the SR transmission times counter is equal to or greater than the maximum SR transmission value, the random access process in the primary cell.

11. The terminal of claim 10, further comprising a transceiver for signaling, when the SR transmission times counter is less than the maximum SR transmission value, the SR through the PUCCH.

12. The terminal of claim 11, wherein when the SR transmission times counter is less than the maximum SR transmission value, the controller increments the SR transmission times counter by 1 and starts the timer.

13. The terminal of claim 8, wherein the determining of whether the SR is pending comprises determining that the SR triggered but not cancelled is the SR pending.

14. The terminal of claim 13, wherein the controller triggers, when a Buffer Status Report (BSR) is triggered, the SR and cancels, when the BSR is included in a Media Access Control Packet Data Unit (MAC PDU), the SR.