Apparatus and method supporting random access for massive connectivity
The present disclosure relates to 5G or pre-5G communication systems that support higher data rates after 4G communication systems such as the LTE system. In the future, high-mobility terminals and low-mobility terminals will coexist in the massive connectivity environment of a mobile communication system. In such an environment, there is proposed a method of performing random access in different ways depending on the type of a terminal. More specifically, a method for a terminal may include: determining the mobility type of the terminal; and transmitting one of random access packets of different classes to the base station according to the determined mobility type.
1. A method for a terminal performing random access in a wireless communication system, the method comprising:
identifying a mobility type of the terminal;
transmitting, to a base station, a first-class random access signal including information on the identified mobility type;
receiving, from the base station, a first random access response message, in case that the identified mobility type is a first-type; and
receiving, from the base station, a second random access response message including approval information permitting a transmission of a second-class random access signal, in case that the identified mobility type is a second-type.
2. The method of claim 1 , further comprising:
transmitting, in case that a mobility type of the terminal is the first-type not satisfying a predetermined condition, the first-class random access signal to the base station; and
transmitting, in case that the mobility type of the terminal is the second-type satisfying the predetermined condition, the second-class random access signal to the base station, based on the approval information being received.
3. The method of claim 1 , wherein, in case that the identified mobility type of the terminal is the second-type, the first-class random access signal is transmitted for performing an initial access procedure.
4. The method of claim 2 , wherein the predetermined condition is satisfied if a position of the terminal is fixed or is changed within a given range.
5. The method of claim 1 , further comprising:
receiving system information including (i) first configuration information for generating the first-class random access signal and (ii) second configuration information for generating the second-class random access signal from the base station.
6. The method of claim 5 , wherein:
the first configuration information includes a specific sequence and first shift information associated with the specific sequence to be used by the terminal of the first-type or the second-type,
the second configuration information includes the specific sequence and second shift information associated with the specific sequence to be used by the terminal of the second-type, and
a cyclic shift corresponding to the first shift information is greater than a cyclic shift corresponding to the second shift information.
7. A method for a base station performing random access in a wireless communication system, the method comprising:
receiving, from a terminal, a first-class random access signal including information on a mobility type of the terminal;
transmitting, to the terminal, a first random access response message, in case that the mobility type of the terminal is a first-type; and
transmitting, to the terminal, a second random access response message including approval information permitting a transmission of a second-class random access signal, in case that the mobility type of the terminal is a second-type.
8. The method of claim 7 , further comprising:
receiving, from the terminal, in case that the mobility type of the terminal is the first-type not satisfying a predetermined condition, the first-class random access signal; and
receiving, from the terminal, in case that the mobility type of the terminal is the second-type satisfying the predetermined condition the second-class random access signal, based on the approval information being received by the terminal,
wherein the predetermined condition is satisfied if a position of the terminal is fixed or is changed within a given range.
9. The method of claim 7 , further comprising:
transmitting system information including (i) first configuration information for generating the first-class random access signal and (ii) second configuration information for generating the second-class random access signal.
10. The method of claim 9 , wherein:
the first configuration information includes a specific sequence and first shift information associated with the specific sequence to be used by the terminal of the first-type or the second-type,
the second configuration information includes the specific sequence and second shift information associated with the specific sequence to be used by the terminal of the second-type, and
a cyclic shift corresponding to the first shift information is greater than a cyclic shift corresponding to the second shift information.
11. A terminal for performing random access in a wireless communication system, comprising:
a transceiver configured to transmit and receive a radio signal; and
a controller configured to:
identify a mobility type of the terminal;
control the transceiver to transmit, to a base station, a first-class random access signal including information on the identified mobility type;
control the transceiver to receive, from the base station, a first random access response message, in case that the identified mobility type is a first-type; and
control the transceiver to receive, from the base station, a second random access response message including approval information permitting a transmission of a second-class random access signal, in case that the identified mobility type is a second-type.
12. The terminal of claim 11 , wherein the controller is configured to:
control the transceiver to transmit, in case that a mobility type of the terminal is the first-type not satisfying a predetermined condition, the first-class random access signal to the base station; and
control, the transceiver to transmit, in case that the mobility type of the terminal is the second-type satisfying the predetermined condition, the second-class random access signal to the base station, based on the approval information being received.
13. The terminal of claim 11 , wherein the controller is configured to
control the transceiver to transmit, in case that the mobility type of the terminal is the second-type, the first-class random access signal to the base station for performing an initial access procedure.
14. The terminal of claim 12 , wherein the predetermined condition is satisfied if a position of the terminal is fixed or is changed within a given range.
15. The terminal of claim 11 , wherein the controller further configured to control the transceiver to receive system information including (i) first configuration information for generating the first-class random access signal and (ii) second configuration information for generating the second-class random access signal from the base station.
16. The terminal of claim 15 , wherein:
the first configuration information includes a specific sequence and first shift information associated with the specific sequence to be used by the terminal of the first-type or the second-type, the second configuration information includes the specific sequence and second shift information associated with the specific sequence to be used by the terminal of the second-type, and
a cyclic shift corresponding to the first shift information is greater than a cyclic shift corresponding to the second shift information.
17. A base station for performing random access in a wireless communication system, comprising:
a transceiver configured to receive a first-class random access signal from a terminal; and
a controller configured to:
control the transceiver to receive, from the terminal, a first-class random access signal including information on, a mobility type of the terminal;
control the transceiver to transmit, to the terminal, a first random access response message, in case that the mobility type of the terminal is a first-type; and
control the transceiver to transmit, to the terminal, a second random access response message including approval information permitting a transmission of a second-class random access signal, in case that the mobility type of the terminal is a second-type.
18. The base station of claim 17 , wherein the controller is further configured to:
control the transceiver to receive, from the terminal, in case that the mobility type of the terminal is the first-type not satisfying a predetermined condition, the first-class random access signal;_and
control the transceiver to receive, from the terminal, in case that the mobility type of the terminal is the second-type satisfying the predetermined condition the second-class random access signal, based on the approval information being received by the terminal,
wherein the predetermined condition is satisfied if a position of the terminal is fixed or is changed within a given range.
19. The base station of claim 17 , wherein the transceiver is configured to transmit system information including (i) first configuration information for generating the first-class random access signal and (ii) second configuration information for generating the second-class random access signal.
20. The base station of claim 19 , wherein:
the first configuration information includes a specific sequence and first shift information associated with the specific sequence to be used by the terminal of the first-type or the second-type,
the second configuration information includes the specific sequence and second shift information associated with the specific sequence to be used by the terminal of the second-type, and
a cyclic shift corresponding to the first shift information is greater than a cyclic shift corresponding to the second shift information.