Communication terminal, communication method, base station and communication system

1. A communication terminal, comprising:

a timing detection unit configured to detect arrival of timing in accordance with a configured cycle;

a condition determination unit configured to determine whether a condition shared with a base station is satisfied;

a receiving unit configured to receive shared condition information related to the shared condition; and

a communication controller configured to control reception of paging in an event the timing detection unit detects the arrival of timing and the condition determination unit determines that the shared condition is satisfied in an event that the shared condition information include flag information that indicates extension of a paging cycle,

wherein the configured cycle corresponds to a first discontinuous reception cycle assigned individually to the communication terminal or a second discontinuous reception cycle common in a cell, wherein both the first discontinuous reception cycle and the second discontinuous reception cycle are shorter than a cycle of system frame, wherein a first cycle of timing at which the timing detection unit detects the arrival of timing and the condition determination unit determines that the shared condition is satisfied is longer than the cycle of system frame, wherein the first cycle of timing is determined based on the first discontinuous reception cycle or the second discontinuous reception cycle, an extension parameter included in the shared condition information and a terminal ID, and

wherein the communication controller is further configured to control reception of paging in accordance with a second cycle of timing determined based on the first discontinuous reception cycle or the second discontinuous reception cycle in an event that the flag information is excluded from the shared condition information, wherein the second cycle of timing is shorter than the cycle of system frame.

2. The communication terminal according to claim 1 , further comprising a counter configured to count elapse of a period, wherein the condition determination unit determines that the shared condition is satisfied in an event a count value obtained by the counter is equal to a setting value shared with the base station.

3. The communication terminal according to claim 2 , wherein the elapsed period is the configured cycle.

4. The communication terminal according to claim 2 , wherein the counter is configured to initialize the count value in an event the count value reaches the setting value.

5. The communication terminal according to claim 2 , wherein the setting value is reported from an external server to the communication terminal via the base station.

6. The communication terminal according to claim 1 , wherein the configured cycle is assigned in common to communication terminals in a cell of the base station.

7. The communication terminal according to claim 1 , wherein a length of the system frame is 10 ms.

8. The communication terminal according to claim 1 , wherein the cycle of system frame is 1024 system frames.

9. The communication terminal according to claim 8 , wherein the extension parameter is configured to indicate the configured cycle, and the flag information is configured to indicate conduction of paging in accordance with the extension parameter.

10. A communication method, comprising:

detecting arrival of timing according to a configured cycle;

determining whether a condition shared with a base station is satisfied;

receiving a shared condition information related to the shared condition;

controlling reception of paging in an event the arrival of timing is detected and it is determined that the shared condition is satisfied in an event that the shared condition information include flag information indicating extension of a paging cycle,

wherein the configured cycle corresponds to a first discontinuous reception cycle assigned individually to the communication terminal or a second discontinuous reception cycle common in a cell, both the first discontinuous reception cycle and the second discontinuous reception cycle being shorter than a cycle of system frame,

wherein a first cycle of timing at which the timing detection unit detects the arrival of timing and the condition determination unit determines that the shared condition is satisfied is longer than the cycle of system frame, and

wherein the first cycle of timing is determined based on the first discontinuous reception cycle or the second discontinuous reception cycle, an extension parameter included in the shared condition information and a terminal ID; and

controlling reception of paging in accordance with a second cycle of timing determined based on the first discontinuous reception cycle or the second discontinuous reception cycle in an event that the flag information is excluded from the shared condition information, the second cycle of timing being shorter than the cycle of system frame.

11. A base station, comprising:

a timing detection unit configured to detect arrival of timing in accordance with a configured cycle;

a condition determination unit configured to determine whether a condition shared with a communication terminal is satisfied;

a receiving unit configured to receive shared condition information related to the shared condition; and

a communication controller configured to control transmission of paging to the communication terminal in an event the timing detection unit detects the arrival of timing and the condition determination unit determines that the shared condition is satisfied in an event that the shared condition information include flag information that indicates extension of a paging cycle,

wherein the configured cycle corresponds to a first discontinuous reception cycle assigned individually to the communication terminal or a second discontinuous reception cycle common in a cell, wherein both the first discontinuous reception cycle and the second discontinuous reception cycle are shorter than a cycle of system frame,

wherein a first cycle of timing at which the timing detection unit detects the arrival of timing and the condition determination unit determines that the shared condition is satisfied is longer than the cycle of system frame,

wherein the first cycle of timing is determined based on the first discontinuous reception cycle or the second discontinuous reception cycle, an extension parameter included in the shared condition information and a terminal ID, and

wherein the communication controller is further configured to control transmission of paging in accordance with a second cycle of timing determined based on the first discontinuous reception cycle or the second discontinuous reception cycle in an event that the flag information is excluded from in the shared condition information, wherein the second cycle of timing is shorter than the cycle of system frame.

12. A communication method, comprising:

detecting arrival of timing according to a configured cycle;

determining whether a condition shared with a communication terminal is satisfied;

receiving a shared condition information related to the shared condition;

controlling transmission of paging to the communication terminal in an event the arrival of timing is detected and it is determined that the shared condition is satisfied in an event that the shared condition information include flag information indicating extension of a paging cycle,

wherein the configured cycle corresponds to a first discontinuous reception cycle assigned individually to the communication terminal or a second discontinuous reception cycle common in a cell, both the first discontinuous reception cycle and the second discontinuous reception cycle being shorter than a cycle of system frame,

wherein a first cycle of timing at which the arrival of timing is detected and it is determined that the shared condition is satisfied is longer than the cycle of system frame, and

wherein the first cycle of timing is determined based on the first discontinuous reception cycle or the second discontinuous reception cycle, an extension parameter included in the shared condition information and a terminal ID; and

controlling transmission of paging in accordance with a second cycle of timing determined based on the first discontinuous reception cycle or the second discontinuous reception cycle in an event that the flag information is excluded from the shared condition information, the second cycle of timing being shorter than the cycle of system frame.