Terminal apparatus, and communication method

• US 10,716,144 B2
• Filed: 02/28/2017
• Issued: 07/14/2020
• Est. Priority Date: 04/20/2016
• Status: Active Grant

• Current Assignee: FG Innovation Company Limited, Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Suzuki, Shoichi, Aiba, Tatsushi, Ohuchi, Wataru, Yoshimura, Tomoki, Liu, Liqing
• Primary Examiner(s): Crutchfield, Christopher M
• Application Number:
  US16/095,313
• Publication Number:
  US 20190141743A1
• Time in Patent Office: 1,232 Days
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• 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 72/0473 the resource being transmission power
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/53 based on regulatory allocation policies
• CPC Class Codes: H04W 74/02 Hybrid access
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 80/02 Data link layer protocols
• CPC Class Codes: H04W 80/08 Upper layer protocols network arrangements or communication protocols for networked applications H04L67/00

Abstract

A terminal apparatus capable of efficiently performing a random access procedure is a terminal apparatus that communicates with a base station apparatus by using multiple serving cells including a primary cell and one or multiple secondary cells, and includes a medium access control layer processing unit (15) for starting a random access procedure in any one of the multiple serving cells based on a PDCCH order, a transmitter (10) for transmitting a random access preamble in any one of the multiple serving cells, and a receiver (10) for receiving a random access response, in which the medium access control layer processing unit (15), in a case that reception of the random access response is considered not successful, determines whether to automatically resume transmission of the random access preamble or not, at least based on which of the primary cell and the secondary cell is used to transmit the random access preamble.

Claims

1. A terminal apparatus which communicates with a base station apparatus by using multiple serving cells including a primary cell and one or multiple secondary cells, comprising:

medium access control layer processing circuitry configured to initiate a random access procedure for a secondary cell based on a single reception of a Physical Downlink Control CHannel (PDCCH) order;

a transmitter configured to transmit a first random access preamble; and

a receiver configured to receive a random access response,

wherein

the transmitter is further configured to transmit a second random access preamble after the transmitter transmits the first random access preamble,

the medium access control layer processing circuitry, in a case that (a) reception of the random access response is considered not successful and (b) the first random access preamble was transmitted on the secondary cell, determines whether to transmit the second random access preamble based on the single reception of the PDCCH order, based on a configuration of a higher layer, and

the transmitter resumes, based on a second PDCCH order, random access preamble transmission to transmit the second random access preamble, in a case that the medium access control layer processing circuitry determines, based on the configuration, that the transmitter does not transmit the second random access preamble based on the single reception.

2. The terminal apparatus according to claim 1, wherein

in a case that (a) reception of the random access response is considered not successful and (b) the first random access preamble was transmitted on the primary cell, the medium access control layer processing circuitry determines that the transmitter transmits the second random access preamble based on the single reception of the PDCCH order.

3. The terminal apparatus according to claim 2, wherein the configuration of the higher layer is a higher layer configuration for the secondary cell which is one of respective higher layer configurations for the one or multiple secondary cells.

4. A communication method used for a terminal apparatus which communicates with a base station apparatus by using multiple serving cells including a primary cell and one or multiple secondary cells, comprising the steps of:

initiating a random access procedure for a secondary cell based on a single reception of a Physical Downlink Control CHannel (PDCCH) order;

transmitting a first random access preamble;

determining, based on a configuration of a higher layer, whether to transmit a second random access preamble based on the single reception of the PDCCH order, in a case that (a) reception of a random access response is considered not successful and (b) the first random access preamble was transmitted on the secondary cell; and

transmitting the second random access preamble after transmitting the first random access preamble, wherein

the second random access preamble is transmitted based on a second PDCCH order used to resume random access preamble transmission, in a case that the terminal apparatus determines, based on the configuration, that terminal apparatus does not transmit the second random access preamble based on the single reception.

5. The communication method according to claim 4, further comprising the step of:

determining that the terminal apparatus transmits the second random access preamble based on the single reception of the PDCCH order, in a case that (a) reception of the random access response is considered not successful and (b) the first random access preamble was transmitted on the primary cell.

6. The communication method according to claim 5, wherein the configuration of the higher layer is a higher layer configuration for the secondary cell which is one of respective higher layer configurations for the one or multiple secondary cells.

7. A base station apparatus which communicates with a terminal apparatus by using multiple serving cells including a primary cell and one or multiple secondary cells, comprising:

a transmitter configured to transmit, to the terminal apparatus, a Physical Downlink Control CHannel (PDCCH) order, wherein the PDCCH order causes the terminal apparatus to initiate a random access procedure for a secondary cell based on a single reception of the PDCCH order; and

a receiver configured to receive, from the terminal apparatus, a first random access preamble,

wherein the transmitter is further configured to transmit a random access response to the terminal apparatus,

the transmitter is further configured to transmit, to the terminal apparatus, a configuration of a higher layer, wherein the configuration causes the terminal apparatus to determine, based on the configuration, whether to transmit a second random access preamble based on the single reception of the PDCCH order in a case that (a) reception of the random access response is considered not successful and (b) the terminal apparatus has transmitted the first random access preamble on the secondary cell,

the transmitter is further configured to transmit a second PDCCH order to the terminal apparatus, wherein, in a case that the terminal apparatus determines, based on the configuration, that terminal apparatus does not transmit the second random access preamble based on the single reception, the second PDDCH order is used to cause the terminal apparatus to resume random access preamble transmission to transmit the second random access preamble, and

the receiver is further configured to receive the second random access preamble after receiving the first random access preamble.

8. A communication method used for a base station apparatus which communicates with a terminal apparatus by using multiple serving cells including a primary cell and one or multiple secondary cells, comprising the steps of:

transmitting, to the terminal apparatus, a Physical Downlink Control CHannel (PDCCH) order, wherein the PDCCH order causes the terminal apparatus to initiate a random access procedure for a secondary cell based on a single reception of the PDCCH order;

receiving, from the terminal apparatus, a first random access preamble;

transmitting a random access response to the terminal apparatus;

transmitting, to the terminal apparatus, a configuration of a higher layer, wherein the configuration causes the terminal apparatus to determine, based on the configuration, whether to transmit a second random access preamble based on the single reception of the PDCCH order in a case that (a) reception of the random access response is considered not successful and (b) the terminal apparatus has transmitted the first random access preamble on the secondary cell;

transmitting a second PDCCH order to the terminal apparatus, wherein, in a case that the terminal apparatus determines, based on the configuration, that terminal apparatus does not transmit the second random access preamble based on the single reception, the second PDDCH order is used to cause the terminal apparatus to resume random access preamble transmission to transmit the second random access preamble; and

receiving the second random access preamble after receiving the first random access preamble.