Japan - Researchers Submit Patent Application, “Radio Communication System”, for Approval (USPTO 20190208495)

Daily Asia Business |

2019 JUL 18 (NewsRx) -- By a News Reporter-Staff News Editor at Daily Asia Business -- From Washington, D.C., NewsRx journalists report that a patent application by the inventors Takahashi, Hideaki (Tokyo, Japan); Uchino, Tooru (Tokyo, Japan); Hapsari, Wuri Andarmawanti (Tokyo, Japan); Umesh, Anil (Tokyo, Japan), filed on , was made available online on .

The patent’s assignee is NTT Docomo Inc. (Tokyo, Japan).

News editors obtained the following quote from the background information supplied by the inventors: “Currently, next generation standards (5G or a new radio access technology (NR)) of a long term evolution (LTE) system and an LTE-advanced system are under review in third generation partnership project (3GPP). As one of discussions in 3GPP, communication states of user equipments (UE) are under review. In the LTE system and the LTE-advanced system, it is specified that user equipments operate in two communication states, that is, a connected state by RRC_Connected and an idle state by RRC_Idle in radio resource control (RRC) that control radio networks.”

As a supplement to the background information on this patent application, NewsRx correspondents also obtained the inventors’ summary information for this patent application: “Problem to be Solved by the Invention

“On the other hand, in an NR system, the introduction of an intermediate transition between the RRC_Connected state and the RRC_Idle state is under review. In the intermediate transition, the connected state between a user equipment and a base station (an NR node) is suspended, and it is unable to perform the allocation of individual resources, whereas the connected state of the user equipment is retained between a core network and the base station. For this reason, the intermediate transition is hereinafter referred to as a ‘sustained state.’ In the sustained state, radio parameters (an access stratum (AS) context) set in the RRC_Connected state are stored in the user equipment and the base station, the core network can detect a position of the user equipment in an area, and the base station can transmit paging to the user equipment in the sustained state. Upon receiving the paging, the user equipment transitions from the sustained state to the connected state and receives downlink data.

“However, a specific process for state transition between the sustained state and the connected state or the idle state has not been discussed. Further, a situation in which the LTE system and the NR system coexist is anticipated, and there is a possibility that the user equipment transitions from the sustained state in the NR system to the LTE system through inter-RAT transition or transitions from the LTE system to the sustained state in the NR system. A specific process for transition to the sustained state or transition from the sustained state which is accompanied by the inter-RAT transition has neither been discussed.

“The present invention was made in light of the above problems, it is an object of the present invention to provide a radio communication system capable of implementing the state transition related to the intermediate transition between the connected state and the idle state.

“Means for Solving Problem

“In order to solve the above problem, an aspect of the present invention relates to a radio communication system, including: a first base station that conforms to a first radio access technology; a second base station that conforms to a second radio access technology; and a user equipment, wherein the user equipment includes a state management unit that manages a communication state of the user equipment, and a state transition unit that causes the communication state of the user equipment to transition, and when a sustenance message for causing the user equipment to transition from a connected state to a sustained state is received from the first base station, the state transition unit causes the user equipment to transition from the connected state to the sustained state, and the state management unit extracts a context identifier specifying radio parameter information for radio communication between the user equipment and the first base station and a base station-based location registration area configured with one or more cells including a cell of the first base station from the sustenance message and retains the radio parameter information, the context identifier, and the base station-based location registration area.

“Effect of the Invention

“According to the present invention, it is possible to implement the state transition related to the intermediate transition between the connected state and the idle state.”

The claims supplied by the inventors are:

“1. A radio communication system, comprising: a first base station that conforms to a first radio access technology; a second base station that conforms to a second radio access technology; and a user equipment, wherein the user equipment includes a state management unit that manages a communication state of the user equipment, and a state transition unit that causes the communication state of the user equipment to transition, and when a sustenance message for causing the user equipment to transition from a connected state to a sustained state is received from the first base station, the state transition unit causes the user equipment to transition from the connected state to the sustained state, and the state management unit extracts a context identifier specifying radio parameter information for radio communication between the user equipment and the first base station and a base station-based location registration area configured with one or more cells including a cell of the first base station from the sustenance message and retains the radio parameter information, the context identifier, and the base station-based location registration area.

“2. The radio communication system according to claim 1, wherein the sustenance message further includes timer information indicating a validity period of the radio parameter information and the base station-based location registration area.

“3. The radio communication system according to claim 1, wherein when the user equipment is communicating with the first base station in the sustained state, if a release message is received from the first base station through a common channel, the state transition unit determines whether or not the release message is destined for the user equipment on the basis of the retained context identifier, and causes the user equipment to transition from the sustained state to an idle state when the release message is determined to be destined for the user equipment.

“4. The radio communication system according to claim 1, wherein when the user equipment is communicating with the first base station in the sustained state, if cell reselection for the second base station is performed, the state transition unit causes the user equipment to transition from the sustained state to an idle state in the second base station, and the state management unit drops the radio parameter information, the context identifier, and the base station-based location registration area at a predetermined drop timing.

“5. The radio communication system according to claim 1, wherein the first base station includes a communication control unit that controls the radio communication with the user equipment, and the communication control unit broadcasts the base station-based location registration area together with a core network-based location registration area.

“6. The radio communication system according to claim 1, wherein the first base station further includes a user equipment management unit that manages the communication state of the user equipment, and when a context identifier for the user equipment in the sustained state is received from a third base station that conforms to the first radio access technology, the user equipment management unit provides the radio parameter information corresponding to the context identifier to the third base station.

“7. The radio communication system according to claim 2, wherein when the user equipment is communicating with the first base station in the sustained state, if a release message is received from the first base station through a common channel, the state transition unit determines whether or not the release message is destined for the user equipment on the basis of the retained context identifier, and causes the user equipment to transition from the sustained state to an idle state when the release message is determined to be destined for the user equipment.

“8. The radio communication system according to claim 2, wherein when the user equipment is communicating with the first base station in the sustained state, if cell reselection for the second base station is performed, the state transition unit causes the user equipment to transition from the sustained state to an idle state in the second base station, and the state management unit drops the radio parameter information, the context identifier, and the base station-based location registration area at a predetermined drop timing.

“9. The radio communication system according to claim 3, wherein when the user equipment is communicating with the first base station in the sustained state, if cell reselection for the second base station is performed, the state transition unit causes the user equipment to transition from the sustained state to an idle state in the second base station, and the state management unit drops the radio parameter information, the context identifier, and the base station-based location registration area at a predetermined drop timing.

“10. The radio communication system according to claim 2, wherein the first base station includes a communication control unit that controls the radio communication with the user equipment, and the communication control unit broadcasts the base station-based location registration area together with a core network-based location registration area.

“11. The radio communication system according to claim 3, wherein the first base station includes a communication control unit that controls the radio communication with the user equipment, and the communication control unit broadcasts the base station-based location registration area together with a core network-based location registration area.

“12. The radio communication system according to claim 4, wherein the first base station includes a communication control unit that controls the radio communication with the user equipment, and the communication control unit broadcasts the base station-based location registration area together with a core network-based location registration area.

“13. The radio communication system according to claim 2, wherein the first base station further includes a user equipment management unit that manages the communication state of the user equipment, and when a context identifier for the user equipment in the sustained state is received from a third base station that conforms to the first radio access technology, the user equipment management unit provides the radio parameter information corresponding to the context identifier to the third base station.

“14. The radio communication system according to claim 3, wherein the first base station further includes a user equipment management unit that manages the communication state of the user equipment, and when a context identifier for the user equipment in the sustained state is received from a third base station that conforms to the first radio access technology, the user equipment management unit provides the radio parameter information corresponding to the context identifier to the third base station.

“15. The radio communication system according to claim 4, wherein the first base station further includes a user equipment management unit that manages the communication state of the user equipment, and when a context identifier for the user equipment in the sustained state is received from a third base station that conforms to the first radio access technology, the user equipment management unit provides the radio parameter information corresponding to the context identifier to the third base station.

“16. The radio communication system according to claim 5, wherein the first base station further includes a user equipment management unit that manages the communication state of the user equipment, and when a context identifier for the user equipment in the sustained state is received from a third base station that conforms to the first radio access technology, the user equipment management unit provides the radio parameter information corresponding to the context identifier to the third base station.”

For additional information on this patent application, see: Takahashi, Hideaki; Uchino, Tooru; Hapsari, Wuri Andarmawanti; Umesh, Anil. Radio Communication System. Filed and posted . Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220190208495%22.PGNR.&OS=DN/20190208495&RS=DN/20190208495

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