CN112543461B

CN112543461B - Interface state maintenance method, device, equipment and computer readable storage medium

Info

Publication number: CN112543461B
Application number: CN201910892042.3A
Authority: CN
Inventors: 赵亚利; 王达
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2023-01-17
Anticipated expiration: 2039-09-20
Also published as: WO2021051886A1; CN112543461A

Abstract

The invention discloses a method, a device and equipment for maintaining interface state and a computer readable storage medium, which relate to the technical field of communication and are used for ensuring the QoS of direct communication interface service. The method comprises the following steps: and maintaining the RRC state of the terminal at the Uu interface according to the following information: and the data transmission state of the terminal at the Uu interface and the data transmission state of the terminal at the direct communication interface. The embodiment of the invention can prevent the terminal from entering the wireless resource control idle state at the Uu interface when the direct communication interface of the terminal has the service transmission requirement, thereby better ensuring the QoS requirement of the direct communication interface.

Description

Interface state maintenance method, device, equipment and computer readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a device, and a computer-readable storage medium for maintaining an interface state.

Background

For a 5G wireless communication system, a process of monitoring a data transmission state is introduced into a Uu interface at present, and according to a data monitoring situation, under a condition that the Uu interface has no data transmission for a long time, a UE (User Equipment) is allowed to be converted from an RRC (Radio Resource Control) connection state into an RRC idle state.

After introducing the direct communication, if the UE uses the resource allocation mode of the network scheduling or has a data transmission requirement on the direct communication interface, but the UE does not have a data transmission requirement on the Uu interface, according to the existing scheme, the UE is allowed to be converted from the RRC connected state to the RRC idle state, and the direct impact is that the direct communication interface cannot use the resource scheduled by the network any more, thereby affecting the QoS (Quality of Service) of the direct communication interface Service.

Disclosure of Invention

Embodiments of the present invention provide a method, an apparatus, a device, and a computer-readable storage medium for maintaining an interface state, which can prevent a terminal from entering a radio resource control idle state at a Uu interface when a service transmission requirement is met at a direct communication interface of the terminal, so as to better meet a QoS requirement of the direct communication interface.

In a first aspect, an embodiment of the present invention provides an interface state maintenance method, applied to a terminal, including:

and maintaining the RRC state of the terminal at the Uu interface according to the following information:

and the data transmission state of the terminal at the Uu interface and the data transmission state of the terminal at the direct communication interface.

Wherein, the data transmission state of the terminal at the direct communication interface includes any one of the following items:

the terminal transmits and/or receives data at the direct communication interface;

a resource allocation pattern of the direct communication interface;

wherein the data of the direct communication interface comprises user plane data and/or control plane data.

Wherein, when the data transmission state of the terminal on the direct communication interface includes the transmission and/or reception of data of the terminal on the direct communication interface, the maintaining of the radio resource control RRC state of the terminal on the Uu interface includes:

maintaining a first timer, and under the condition that the first timer is overtime, converting the RRC state of the terminal at the Uu interface from an RRC connected state to an RRC idle state or an RRC non-activated state;

wherein maintaining the first timer means starting or restarting the first timer when at least one of the following conditions is satisfied:

a Media Access Control (MAC) entity of the Uu interface receives a MAC SDU (Service Data Unit) from a target logical channel of the Uu interface;

the MAC entity of the Uu interface sends MAC SDU aiming at the target logical channel of the Uu interface;

the MAC entity of the direct communication interface receives MAC SDU from a target logical channel of the direct communication interface;

the MAC entity of the direct communication interface sends MAC SDU aiming at the target logical channel of the direct communication interface.

respectively maintaining a second timer and a third timer, and under the condition that the second timer and the third timer are overtime, converting the RRC state of the terminal at the Uu interface from an RRC connected state to an RRC idle state or an RRC non-activated state;

wherein maintaining the second timer means starting or restarting the second timer when at least one of the following conditions is satisfied:

the MAC entity of the Uu interface receives the MAC SDU from the target logic channel of the Uu interface;

wherein maintaining the third timer means starting or restarting the third timer when at least one of the following conditions is satisfied:

maintaining a second timer, and maintaining the RRC state of the terminal in the Uu interface in an RRC connected state when the second timer is overtime and the direct communication interface has a data transmission and/or reception requirement; under the condition that the second timer is overtime and the direct communication interface has no data transmission and/or reception requirements, the RRC state of the terminal on the Uu interface is converted into an RRC idle state or an RRC non-activated state from an RRC connected state;

wherein the maintaining the second timer means starting or restarting the second timer when at least one of the following conditions is satisfied:

and the MAC entity of the Uu interface sends the MAC SDU aiming at the target logical channel of the Uu interface.

Wherein, in a case that the data transmission state of the terminal on the direct communication interface includes transmission and/or reception of data of the terminal on the direct communication interface, the maintaining of the radio resource control RRC state of the terminal on the Uu interface includes:

maintaining a second timer, and restarting the second timer at a timeout time of the second timer or within a first time period before the second timer times out if the direct communication interface satisfies the following condition: the direct communication interface has data sending and/or receiving requirements;

under the condition that the second timer is overtime, the RRC state of the terminal at the Uu interface is converted into an RRC idle state or an RRC inactive state from an RRC connected state;

maintaining a second timer, and if target downlink data sent by network side equipment is received within a timeout time of the second timer or a first time period before the second timer is overtime, restarting the second timer;

the target downlink data is sent by the network side equipment under the condition that the Uu interface is determined to have no data sending and/or receiving requirements and the direct communication interface has data sending and/or receiving requirements.

maintaining a second timer, and sending target uplink data or target uplink control information to network side equipment at the timeout moment of the second timer or within a first time period before the second timer is overtime so as to restart the second timer;

the target uplink data or the target uplink control information is sent by the terminal under the condition that the Uu interface is determined to have no data sending and/or receiving requirements and the direct communication interface has data sending and/or receiving requirements.

Wherein, when the data transmission state of the terminal at the direct communication interface includes the resource allocation mode of the direct communication interface, the maintaining the radio resource control RRC state of the terminal at the Uu interface includes:

maintaining a second timer, and maintaining the RRC state of the terminal in the Uu interface in an RRC connected state if the second timer is expired and the direct communication interface uses a network scheduled resource allocation mode or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation mode;

under the condition that the second timer is overtime and the direct communication interface does not use the resource allocation mode scheduled by the network or any radio bearer on the direct communication interface does not use the resource allocation mode scheduled by the network, the RRC state of the terminal on the Uu interface is converted into an RRC idle state or an RRC non-activated state from an RRC connected state;

Wherein, when the data transmission state of the terminal on the direct communication interface includes the resource allocation mode of the direct communication interface, maintaining the radio resource control RRC state of the terminal on the Uu interface includes:

maintaining a second timer, and restarting the second timer at a timeout time of the second timer or within a first time period before the second timer times out if the direct communication interface satisfies the following condition: the direct communication interface uses a network scheduled resource allocation pattern or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation pattern;

under the condition that the second timer is overtime, the RRC state of the terminal at the Uu interface is converted into an RRC idle state or an RRC non-activated state from an RRC connected state;

maintaining a second timer, and restarting the second timer if target downlink data sent by network side equipment is received at the timeout moment of the second timer or within a first time period before the timeout of the second timer; wherein the target downlink data is transmitted by the network side device when it is determined that the Uu interface has no data transmission and/or reception requirements and the direct communication interface uses a network scheduled resource allocation mode or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation mode;

a Media Access Control (MAC) entity of the Uu interface receives MAC SDU from a Uu interface target logic channel;

sending target uplink data or target uplink control information to network side equipment at the timeout moment of the second timer or within a first time period before the second timer is overtime so as to restart the second timer; wherein the target uplink data or target uplink control information is transmitted by the terminal when it is determined that the Uu interface has no data transmission and/or reception requirements and the direct communication interface uses a network scheduled resource allocation mode or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation mode;

Wherein the Uu interface target logical channel comprises one or more of:

a Uu interface dedicated traffic channel; a Uu interface dedicated control channel; a Uu interface common control channel;

the direct communication interface target logical channel includes one or more of:

a direct communication interface traffic channel; a direct communication interface broadcasting a control channel; the direct communication interface controls a channel.

Wherein the target downlink data includes: an empty MAC SDU or an empty MAC PDU (Protocol Data Unit).

Wherein the target uplink data comprises: empty MAC SDUs or empty MAC PDUs; the target uplink Control information includes an empty BSR (Buffer Status Report) MAC CE (Control Element).

Wherein the method further comprises:

and when the direct communication interface has a requirement for data transmission and/or reception, sending indication information to the network side equipment.

In a second aspect, an embodiment of the present invention provides an interface state maintenance method, applied to a network side device, including:

receiving indication information of a terminal;

and determining whether the terminal has a requirement for data transmission and/or reception in a direct communication interface according to the indication information.

Wherein the method further comprises:

maintaining a second timer, sending target downlink data to the terminal at the timeout moment of the second timer or within a first time period before the second timer is overtime, and restarting the second timer;

the target downlink data is sent by the network side equipment under the condition that the Uu interface is determined to have no data sending and/or receiving requirement, but the terminal is determined to have the data sending and/or receiving requirement on the direct communication interface according to the indication information.

Wherein the target downlink data comprises: empty MAC SDUs or empty MAC PDUs.

In a third aspect, an embodiment of the present invention provides an interface state maintenance device, which is applied to a terminal, and includes:

the processing module is used for maintaining the Radio Resource Control (RRC) state of the terminal at the Uu interface according to the following information:

the terminal sends and/or receives data at the direct communication interface;

a resource allocation pattern of the direct communication interface;

In a fourth aspect, an embodiment of the present invention provides an interface state maintenance apparatus, which is applied to a network side device, and includes:

the receiving module is used for receiving the indication information of the terminal;

and the determining module is used for determining whether the terminal has the requirement of data transmission and/or reception in the direct communication interface according to the indication information.

Wherein the apparatus further comprises:

the processing module is used for maintaining a second timer, sending target downlink data to the terminal at the overtime moment of the second timer or within a first time period before the second timer is overtime, and restarting the second timer;

In a fifth aspect, an embodiment of the present invention provides an interface state maintenance device, which is applied to a terminal, and includes: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; the processor is used for reading the program in the memory and executing the following processes:

and maintaining the Radio Resource Control (RRC) state of the terminal on the Uu interface according to the following information:

a resource allocation pattern of the direct communication interface;

Wherein, in case that the data transmission state of the terminal at the direct communication interface includes the transmission and/or reception of data at the direct communication interface, the processor is further configured to read the program in the memory, and execute the following processes:

Wherein, in case that the data transmission state of the terminal at the direct communication interface includes the sending and/or receiving of data at the direct communication interface, the processor is further configured to read the program in the memory, and execute the following processes:

maintaining a second timer, and restarting the second timer if target downlink data sent by network side equipment is received at the timeout moment of the second timer or within a first time period before the timeout of the second timer;

the target uplink data or the target uplink control information is sent by the terminal under the condition that the Uu interface is determined to have no data sending and/or receiving requirement and the direct communication interface has the data sending and/or receiving requirement.

Wherein, in the case that the data transmission state of the terminal at the direct communication interface includes the resource allocation mode of the direct communication interface, the processor is further configured to read the program in the memory, and execute the following procedures:

maintaining a second timer, and restarting the second timer at a timeout time of the second timer or within a first time period before the second timer times out if the direct communication interface satisfies the following conditions: the direct communication interface uses a network scheduled resource allocation pattern or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation pattern;

sending target uplink data or target uplink control information to network side equipment at the timeout moment of the second timer or within a first time period before the second timer is overtime so as to restart the second timer; wherein the target uplink data or target uplink control information is transmitted by the terminal under the condition that the terminal determines that the Uu interface has no data transmission and/or reception requirement and the direct communication interface uses a resource allocation mode scheduled by a network or at least one radio bearer on the direct communication interface uses a resource allocation mode scheduled by the network;

In a sixth aspect, an embodiment of the present invention provides an interface state maintenance device, which is applied to a network side device, and includes: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; the processor is used for reading the program in the memory and executing the following processes:

receiving indication information of a terminal;

Wherein the processor is further configured to read the program in the memory and execute the following processes:

In a seventh aspect, an embodiment of the present invention provides a computer-readable storage medium for storing a program, where the program, when executed by a processor, implements the steps in the method according to the first aspect; alternatively, the program realizes the steps in the method according to the second aspect when executed by a processor.

In the embodiment of the invention, the data transmission state of the terminal at the direct communication interface is considered for the maintenance of the RRC state of the Uu interface, so that the scheme of the embodiment of the invention can prevent the terminal from entering the wireless resource control idle state at the Uu interface when the direct communication interface of the terminal has a service transmission requirement, thereby better ensuring the QoS requirement of the direct communication interface.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a flowchart of an interface state maintenance method according to an embodiment of the present invention;

FIGS. 2-11 are schematic diagrams of an embodiment of the present invention;

fig. 12 is a second flowchart of an interface status maintenance method according to an embodiment of the present invention;

fig. 13 is one of the structural diagrams of an interface state maintenance apparatus provided in the embodiment of the present invention;

fig. 14 is a second block diagram of an interface status maintenance apparatus according to an embodiment of the present invention;

fig. 15 is a diagram illustrating one of structures of an interface status maintenance device according to an embodiment of the present invention;

fig. 16 is a second structural diagram of an interface status maintenance device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

Referring to fig. 1, fig. 1 is a flowchart of an interface status maintenance method provided by an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:

step 101, maintaining the RRC state of the terminal at the Uu interface according to the following information:

Wherein, the data transmission state of the terminal at the direct communication interface includes any one of the following:

the terminal sends and/or receives data at the direct communication interface; a resource allocation pattern of the direct communication interface; wherein the data of the direct communication interface comprises user plane data and/or control plane data.

Hereinafter, a manner of maintaining the RRC state of the terminal on the Uu interface will be described in conjunction with the data transmission states of different terminals on the direct communication interface.

1. The data transmission state of the terminal at the direct communication interface comprises the sending and/or receiving of data of the terminal at the direct communication interface.

In this case, there are several processing methods as follows:

(1) And maintaining a first timer, and under the condition that the first timer is overtime, converting the RRC state of the terminal at the Uu interface from an RRC connected state to an RRC idle state or an RRC non-activated state. That is, in this manner, only one first timer needs to be maintained, and the maintenance of the first timer needs to consider the data receiving or transmitting conditions of the Uu interface and the direct communication interface at the same time.

Wherein the maintaining the first timer means starting or restarting the first timer when at least one of the following conditions is satisfied:

(2) And respectively maintaining a second timer and a third timer, and under the condition that the second timer and the third timer are overtime, converting the RRC state of the terminal in the Uu interface from an RRC connected state to an RRC idle state or an RRC non-activated state. That is, in this method, one timer is maintained for each of the direct communication interface and the Uu interface, and the maintenance of each timer is performed only in consideration of the data reception or transmission of the corresponding communication interface. For example, a second timer is maintained for the Uu interface and a third timer is maintained for the direct communication interface.

the MAC entity of the direct communication interface receives MAC SDU from a target logic channel of the direct communication interface;

(3) Maintaining a second timer, and maintaining the RRC state of the terminal in the Uu interface in an RRC connection state under the condition that the second timer is overtime and the direct communication interface has data transmission and/or reception requirements; and under the condition that the second timer is overtime and the direct communication interface has no data transmission and/or reception requirements, the RRC state of the terminal on the Uu interface is converted into an RRC idle state or an RRC non-activated state from an RRC connected state.

That is, in this manner, the second timer is maintained for the Uu interface data transfer state. In this case, if the second timer expires but the direct communication interface has a data transmission/reception requirement, the RRC state change is not allowed but maintained in the RRC connected state. The UE may transition from the RRC connected state to the RRC idle or RRC inactive state only if the timer expires and the direct communication interface has no data transmission/reception requirements.

(4) Maintaining a second timer, and restarting the second timer at a timeout time of the second timer or within a first time period before the second timer times out if the direct communication interface satisfies the following conditions: the direct communication interface has data transmission and/or reception requirements.

That is, in this manner, the second timer is maintained for the Uu interface data transfer state. If the second timer is expired but the direct communication interface has a data transmission/reception requirement, the UE restarts the second timer. Only if the timer expires, the UE will transition from the RRC connected state to the RRC idle or RRC inactive state.

(5) Maintaining a second timer, and if target downlink data sent by network side equipment is received within a first time period at the timeout moment of the second timer or before the second timer is overtime, restarting the second timer; and under the condition that the second timer is overtime, the RRC state of the terminal in the Uu interface is converted from an RRC connected state into an RRC idle state or an RRC non-activated state.

That is, in this manner, the second timer is maintained for the Uu interface data transfer state. If the network side device predicts that the Uu interface has no data receiving/transmitting requirement but the direct communication interface has the data receiving/transmitting requirement before the timeout moment or the timeout of the second timer, the network side device sends specific downlink data (such as empty MAC SDU) to the UE at the Uu interface, and prompts the UE to restart the second timer. The UE is allowed to change from the RRC connected state to the RRC idle state or the RRC inactive state only if the second timer times out.

the target downlink data is sent by the network side equipment under the condition that the Uu interface is determined to have no data sending and/or receiving requirement and the direct communication interface has the data sending and/or receiving requirement.

(6) Maintaining a second timer, and sending target uplink data or target uplink control information to network side equipment at the timeout moment of the second timer or within a first time period before the second timer is overtime so as to restart the second timer; and under the condition that the second timer is overtime, the RRC state of the terminal on the Uu interface is converted into an RRC idle state or an RRC inactive state from an RRC connected state.

That is, in this manner, the second timer is maintained for the Uu interface data transfer state. And at the timeout moment of the second timer or before the timeout, if the UE predicts that the Uu interface has no data receiving/transmitting requirement but the direct communication interface has the data receiving/transmitting requirement, the UE sends specific uplink data or control information to the network side equipment at the Uu interface, and prompts the UE to restart the second timer through uplink transmission. Changing from the RRC connected state to the RRC idle state or the RRC inactive state is allowed only when the second timer times out.

2. The data transmission state of the terminal at the direct communication interface comprises a resource allocation mode of the direct communication interface.

In this case, there are several processing methods as follows:

(1) Maintaining a second timer, and maintaining the RRC state of the terminal in the Uu interface in an RRC connected state when the second timer is overtime and the direct communication interface uses a network scheduled resource allocation mode or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation mode; and under the condition that the second timer is overtime and the direct communication interface does not use the resource allocation mode scheduled by the network or any radio bearer on the direct communication interface does not use the resource allocation mode scheduled by the network, the RRC state of the terminal on the Uu interface is converted into an RRC idle state or an RRC inactive state from an RRC connected state.

That is, in this manner, the second timer is maintained for the Uu interface data transfer state. If the second timer expires but the direct communication interface uses the network scheduled resource allocation pattern or at least one radio bearer on the direct communication interface uses the network scheduled resource allocation pattern, the RRC state change is not allowed to be made but maintained in the RRC connected state. The change from the RRC connected state to the RRC idle state or the RRC inactive state is allowed only if the second timer expires without the direct communication interface using the network scheduled resource allocation mode or without any bearer on the direct communication interface using the network scheduled resource allocation mode.

(2) Maintaining a second timer, and restarting the second timer at the timeout moment of the second timer or within a first time period before the second timer is timed out if the direct communication interface meets the following conditions: the direct communication interface uses a network scheduled resource allocation pattern or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation pattern; and under the condition that the second timer is overtime, the RRC state of the terminal in the Uu interface is converted from an RRC connected state into an RRC idle state or an RRC non-activated state.

That is, in this manner, the second timer is maintained for the Uu interface data transfer state. If the second timer expires but the direct communication interface uses the network scheduled resource allocation pattern or at least one radio bearer on the current direct communication interface of the UE uses the network scheduled resource allocation pattern, the UE restarts the second timer. Changing from the RRC connected state to the RRC idle state or the RRC inactive state is allowed only when the timer expires.

(4) Maintaining a second timer, and restarting the second timer if target downlink data sent by network side equipment is received at the timeout moment of the second timer or within a first time period before the timeout of the second timer; wherein the target downlink data is transmitted by the network side device when it is determined that the Uu interface has no data transmission and/or reception requirements and the direct communication interface uses a network scheduled resource allocation mode or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation mode; and under the condition that the second timer is overtime, the RRC state of the terminal on the Uu interface is converted into an RRC idle state or an RRC inactive state from an RRC connected state.

That is, in this manner, the second timer is maintained for the Uu interface data transfer state. If the network side device predicts that the Uu interface has no data receiving/transmitting requirement but the direct communication interface uses the resource allocation mode scheduled by the network or at least one radio bearer on the direct communication interface uses the resource allocation mode scheduled by the network before the timeout moment or timeout of the second timer, the network side device sends specific downlink data (such as empty MAC SDU) to the UE on the Uu interface, and prompts the UE to restart the second timer. Changing from the RRC connected state to the RRC idle state or the RRC inactive state is allowed only when the second timer times out.

(4) Sending target uplink data or target uplink control information to network side equipment at the timeout moment of the second timer or within a first time period before the second timer is overtime so as to restart the second timer; wherein the target uplink data or target uplink control information is transmitted by the terminal under the condition that the terminal determines that the Uu interface has no data transmission and/or reception requirement and the direct communication interface uses a resource allocation mode scheduled by a network or at least one radio bearer on the direct communication interface uses a resource allocation mode scheduled by the network; and under the condition that the second timer is overtime, the RRC state of the terminal in the Uu interface is converted from an RRC connected state into an RRC idle state or an RRC non-activated state.

That is, in this manner, the second timer is maintained for the Uu interface data transfer state. Before the second timer is overtime, if the UE predicts that the Uu interface has no data receiving/sending requirement but the direct communication interface uses the resource allocation mode scheduled by the network or at least one radio bearer on the direct communication interface uses the resource allocation mode scheduled by the network, the UE sends specific uplink data or control information to the network side equipment on the Uu interface and prompts the UE to restart the second timer through uplink transmission. Changing from the RRC connected state to the RRC idle state or the RRC inactive state is allowed only if the second timer times out.

In the above embodiment, the Uu interface target logical channel includes one or more of: a Uu interface dedicated traffic channel; a Uu interface dedicated control channel; a Uu interface common control channel; the direct communication interface target logical channel includes one or more of: a direct communication interface traffic channel; a direct communication interface broadcasting a control channel; the direct communication interface controls a channel.

In the above embodiment, the target downlink data includes: empty MAC SDUs or empty MAC PDUs. The target uplink data includes: empty MAC SDU or empty MAC PDU; the target uplink control information includes an empty BSR MAC CE.

In the above embodiments, the length of the first period of time may be arbitrarily set.

In the prior art, a data inactivity timer (datainactivity timer) is defined during the process of monitoring the Uu interface. When a MAC entity of a Uu interface of a UE receives a MAC SDU from a DTCH (Dedicated Traffic Channel) logical Channel and/or a DCCH (Dedicated Control Channel) logical Channel and/or a CCCH (Common Control Channel) logical Channel or transmits a MAC SDU for the DTCH logical Channel and/or the DCCH logical Channel, a datainactivetytimer is started/restarted. If the datainactivity timer times out, indication information is transmitted to a higher layer (RRC layer). And when the UE high layer (RRC layer) receives the indication information, the UE RRC connection is released, and the RRC idle state is entered.

According to the protocol convention at present, data monitoring of the Uu interface only monitors the data receiving/sending situation of the Uu interface, and the data receiving/sending situation of the direct communication interface is not considered at all, so the following situations may occur: the direct communication interface requires the UE to remain in the RRC connected state, but since the Uu interface has no data transmission requirement, the Uu interface automatically switches to the RRC idle state. This will therefore affect the QoS satisfaction of the direct communication interface traffic and thus directly the user experience of the direct communication traffic. In order to meet the QoS requirement of the direct communication service, the implementation of the invention provides a method for maintaining the interface state, namely, the terminal maintains the RRC state of the terminal on the Uu interface according to the data transmission state of the terminal on the direct communication interface.

The following describes the implementation of the embodiments of the present invention in detail with reference to different embodiments.

In one embodiment, the UE maintains only one timer, and the maintenance of the timer needs to consider the data transmission/reception conditions of the Uu interface and the direct communication interface at the same time. With reference to fig. 2, the specific timer maintenance method is as follows:

at time T1, the UE starts the timer when one or a combination of the following conditions are met:

(1) A MAC entity of a Uu interface of the UE receives a MAC SDU from a Uu interface specific logical Channel (including, but not limited to, a Uu interface Dedicated Traffic Channel (DTCH)/Uu interface Dedicated Control Channel (DCCH)/Uu interface Common Control Channel (CCCH));

(2) A MAC entity of the Uu interface of the UE transmits a MAC SDU for a Uu interface specific logical channel including, but not limited to, a Uu interface dedicated traffic channel/Uu interface Dedicated Control Channel (DCCH);

(3) A MAC entity of a direct communication interface of the UE receives a MAC SDU from a direct communication interface specific logical Channel (including, but not limited to, a direct communication interface Traffic Channel (STCH)/a direct communication interface Broadcast Control Channel (SBCCH)/a direct communication interface Control Channel (SCCH));

(4) The MAC entity of the direct communication interface of the UE transmits MAC SDUs for direct communication interface specific logical channels including, but not limited to, a direct communication interface traffic channel (STCH)/a direct communication interface broadcast control channel (SBCCH)/a direct communication interface control channel (SCCH).

At time T2, the UE restarts the timer when one or a combination of the following conditions is met:

(1) A MAC entity of a Uu interface of the UE receives MAC SDU from a specific logical channel of the Uu interface (including but not limited to a special traffic channel (DTCH) of the Uu interface/a special control channel (DCCH) of the Uu interface/a Common Control Channel (CCCH) of the Uu interface);

(2) The MAC entity of the Uu interface of the UE transmits MAC SDUs for Uu interface specific logical channels including, but not limited to, uu interface Dedicated Traffic Channel (DTCH)/Uu interface Dedicated Control Channel (DCCH);

(3) A MAC entity of a direct communication interface of the UE receives a MAC SDU from a direct communication interface specific logical channel including, but not limited to, a direct communication interface traffic channel (STCH)/a direct communication interface broadcast control channel (SBCCH)/a direct communication interface control channel (SCCH);

(4) The MAC entity of the direct communication interface of the UE transmits MAC SDUs for direct communication interface specific logical channels including, but not limited to, direct communication interface traffic channel (STCH)/direct communication interface broadcast control channel (SBCCH)/direct communication interface control channel (SCCH).

At time T3, the timer times out. Upon expiration of the timer, the UE transitions from the RRC connected state to the RRC idle or RRC inactive state in the RRC state of the Uu interface.

In one embodiment, the UE maintains one timer for each of the direct communication interface and the Uu interface, and the maintenance of each timer only considers the data transmission/reception situation of its corresponding communication interface. That is, the maintenance of the timer of the Uu interface needs to consider the data receiving/transmitting condition of the Uu interface. With reference to fig. 3, the specific timer maintenance method is as follows:

the timer maintenance procedure for the direct communication interface is as follows:

at time T1, the UE starts the timer of the direct communication interface when one or a combination of the following conditions are met:

(1) A MAC entity of a direct communication interface of the UE receives a MAC SDU from a direct communication interface specific logical channel including, but not limited to, a direct communication interface traffic channel (STCH)/a direct communication interface broadcast control channel (SBCCH)/a direct communication interface control channel (SCCH);

(2) The MAC entity of the direct communication interface of the UE transmits MAC SDUs for direct communication interface specific logical channels including, but not limited to, a direct communication interface traffic channel (STCH)/a direct communication interface broadcast control channel (SBCCH)/a direct communication interface control channel (SCCH).

At time T3, the UE restarts the timer of the direct communication interface when one or a combination of the following conditions is satisfied:

(2) The MAC entity of the direct communication interface of the UE transmits MAC SDUs for direct communication interface specific logical channels including, but not limited to, direct communication interface traffic channel (STCH)/direct communication interface broadcast control channel (SBCCH)/direct communication interface control channel (SCCH).

The timer maintenance procedure for the Uu interface is as follows:

at time T2, the UE starts the timer of the Uu interface when one or a combination of the following conditions are met:

(2) A MAC entity of the Uu interface of the UE transmits MAC SDUs for Uu interface specific logical channels including, but not limited to, uu interface Dedicated Traffic Channel (DTCH)/Uu interface Dedicated Control Channel (DCCH);

at time T4, the UE restarts the timer of the Uu interface when one or a combination of the following conditions is met:

time T5/T6: at the time of T5, the timer of the direct communication interface corresponding to the UE is overtime; and at the time of T6, the timer of the Uu interface corresponding to the UE is overtime.

The RRC state of the UE at the Uu interface is transitioned from the RRC connected state to the RRC idle or RRC inactive state only if both the direct communication interface timer and the Uu interface timer expire.

In an embodiment, for a Uu interface data transmission state maintenance timer (a specific maintenance mechanism is the same as a current Uu interface datainactivity timer maintenance mechanism), if the timer is overtime, but the UE has a data transmission/reception requirement at a current direct communication interface, the UE does not allow RRC state change and maintains the RRC connection state. With reference to fig. 4, the specific timer maintenance method is as follows:

(2) The MAC entity of the Uu interface of the UE transmits MAC SDUs for Uu interface specific logical channels including, but not limited to, uu interface Dedicated Traffic Channel (DTCH)/Uu interface Dedicated Control Channel (DCCH).

(1) A MAC entity of a Uu interface of the UE receives MAC SDU from a Uu interface specific logical channel (including but not limited to a Uu interface Dedicated Traffic Channel (DTCH)/Uu interface Dedicated Control Channel (DCCH)/Uu interface Common Control Channel (CCCH));

At time T3, the timer times out.

At time T4, although the timer is already expired at time T3, since the UE has a data transmission/reception requirement on the current direct communication interface, the UE does not allow the RRC state change, but maintains the RRC connected state. Until time T4, the direct communication interface has no data transmission/reception requirements, and the UE is not allowed to transition from the RRC connected state to the RRC idle or RRC inactive state.

In one embodiment, for a Uu interface data transmission state maintenance timer (a specific maintenance mechanism is the same as a current Uu interface datainactivity timer maintenance mechanism), if the timer is overtime, but the UE has a data transmission/reception requirement at a current direct communication interface, the UE does not allow RRC state change and maintains an RRC connected state. With reference to fig. 5, the specific timer maintenance method is as follows:

(2) The MAC entity of the Uu interface of the UE transmits MAC SDUs for Uu interface specific logical channels including, but not limited to, the Uu interface Dedicated Traffic Channel (DTCH)/Uu interface Dedicated Control Channel (DCCH).

At time T3, the timer times out. But the UE has data receiving/transmitting requirement on the direct communication interface, and the UE restarts the timer.

At the time of T4, the timer times out, and at this time, the UE has no data transmission/reception requirement on the direct communication interface, and the UE transitions from the RRC connected state to the RRC idle state or the RRC inactive state.

In one embodiment, a timer is maintained for a Uu interface data transmission state (a specific maintenance mechanism is the same as a current Uu interface datainactivity timer maintenance mechanism), before the timer expires, if the network device predicts that the UE Uu interface has no data receiving/transmitting requirement but the UE has a data receiving/transmitting requirement on a direct communication interface, the network device sends specific downlink data (such as an empty MAC SDU) to the UE on the Uu interface, and causes the UE to restart the timer. Changing from the RRC connected state to the RRC idle state or the RRC inactive state is allowed only when the timer expires. With reference to fig. 6, the specific timer maintenance method is as follows:

At time T3, before the timer expires, if the network device predicts that the UE Uu interface has no data transmission requirement but the UE has a data receiving/transmitting requirement at the direct communication interface, the network device sends specific downlink data (such as empty MAC SDU) to the UE at the Uu interface, and prompts the UE to restart the timer.

At time T4, the timer expires, and the UE transitions from the RRC connected state to the RRC idle or RRC inactive state.

In one embodiment, a timer is maintained for the data transmission state of the Uu interface (the specific maintenance mechanism is the same as the current Uu interface datainactivity timer maintenance mechanism). Before the timer expires, if the UE predicts that the UE Uu interface has no data receiving/transmitting requirement but the UE has data receiving/transmitting requirement on the direct communication interface, the UE sends specific uplink data to the network on the Uu interface (for example, an empty MAC SDU or empty BSR (Buffer Status Report) MAC CE (Channel Element, control unit, etc.) is generated), so as to prompt the UE to restart the timer. Changing from the RRC connected state to the RRC idle state or the RRC inactive state is allowed only when the timer expires. With reference to fig. 7, the specific timer maintenance method is as follows:

At the time of T3, before the timer expires, if the UE predicts that the UE Uu interface has no data transmission/reception requirement but the UE has a data transmission/reception requirement on the direct communication interface, the UE sends uplink data or control information to the network device. For example, if there is uplink resource, an empty MAC SDU or empty BSR MAC CE may be transmitted. If there is no uplink resource, an SR (Scheduling Request) may be sent, the network device allocates uplink resource to the terminal according to the SR, and transmits an empty MAC SDU or empty BSR MAC CE using the uplink resource, so that the timer may be restarted.

In one embodiment, for a Uu interface data transmission state maintenance timer (a specific maintenance mechanism is the same as a current Uu interface datainactivity timer maintenance mechanism), if the timer times out, but the current UE direct communication interface uses a network scheduled resource allocation mode or at least one radio bearer on the UE direct communication interface uses the network scheduled resource allocation mode, the UE does not allow the RRC state change and maintains the RRC connected state. And only when the timer is overtime, the UE direct communication interface does not use the resource allocation mode scheduled by the network or any bearer on the UE direct communication interface does not use the resource allocation mode scheduled by the network, the RRC connection state is allowed to be changed into the RRC idle state or the RRC non-activated state. With reference to fig. 8, the specific timer maintenance method is as follows:

At time T3, the timer times out.

At time T4, although the timer is already expired at time T3, since the UE currently uses the resource allocation mode scheduled by the network or at least one radio bearer on the UE direct communication interface uses the resource allocation mode scheduled by the network, the UE is not allowed to perform RRC state change and needs to be maintained in an RRC connected state. The UE is not allowed to transition from the RRC connected state to the RRC idle or RRC inactive state until time T4 when the UE direct communication interface does not use the network scheduled resource allocation mode or neither bearer on the UE direct communication interface uses the network scheduled resource allocation mode.

In one embodiment, a timer is maintained for the Uu interface data transmission state (the specific maintenance mechanism is the same as the current Uu interface dataInactivatyTimer maintenance mechanism). If the timer is overtime, but the current direct communication interface of the UE uses the resource allocation mode of network scheduling or at least one radio bearer on the current direct communication interface of the UE uses the resource allocation mode of network scheduling, the UE restarts the timer; changing from the RRC connected state to the RRC idle state or the RRC inactive state is allowed only when the timer expires. With reference to fig. 9, the specific timer maintenance method is as follows:

At time T3, the timer times out. If the timer is overtime but the UE currently uses the network scheduled resource allocation mode on the direct communication interface or at least one radio bearer on the UE currently uses the network scheduled resource allocation mode, the UE restarts the timer.

At the time T4, the timer times out, and at this time, the UE has no data transmission/reception requirement on the direct communication interface, and the UE transitions from the RRC connected state to the RRC idle state or the RRC inactive state.

In one embodiment, a timer is maintained for the Uu interface data transmission state (the specific maintenance mechanism is the same as the current Uu interface dataInactivatyTimer maintenance mechanism). Before the timer is overtime, if the network side equipment predicts that the Uu interface of the UE has no data receiving/sending requirement, but the current direct communication interface of the UE uses the resource allocation mode of network scheduling or at least one radio bearer on the current direct communication interface of the UE uses the resource allocation mode of network scheduling, the network side equipment sends specific downlink data (such as empty MAC SDU) to the UE on the Uu interface, and the UE is prompted to restart the timer. Changing from the RRC connected state to the RRC idle state or the RRC inactive state is allowed only when the timer expires. With reference to fig. 10, the specific timer maintenance method is as follows:

At time T3, the timer times out. If the network side equipment predicts that the Uu interface of the UE has no data receiving/sending requirement, but the current direct communication interface of the UE uses the resource allocation mode scheduled by the network or at least one radio bearer on the current direct communication interface of the UE uses the resource allocation mode scheduled by the network, the network side equipment sends specific downlink data (such as empty MAC SDU) to the UE on the Uu interface, and prompts the UE to restart the timer.

In one embodiment, a timer is maintained for the data transmission state of the Uu interface (the specific maintenance mechanism is the same as the current Uu interface datainactivity timer maintenance mechanism). Before the timer is overtime, if the UE predicts that the UE Uu interface has no data receiving/sending requirement but the UE uses a resource allocation mode scheduled by a network on a direct communication interface or at least one radio bearer uses the resource allocation mode scheduled by the network on the current direct communication interface of the UE, the UE sends specific uplink data or control information to the network on the Uu interface, and the UE is prompted to restart the timer through uplink transmission. Changing from the RRC connected state to the RRC idle state or the RRC inactive state is allowed only when the timer expires. With reference to fig. 11, the specific timer maintenance method is as follows:

At the time of T3, before the timer is overtime, if the UE predicts that the UE Uu interface has no data receiving/sending requirement but the UE uses the resource allocation mode of network scheduling on the direct communication interface or at least one radio bearer uses the resource allocation mode of network scheduling on the current direct communication interface of the UE, the UE sends specific uplink data or control information to the network on the Uu interface, and the UE is prompted to restart the timer through uplink transmission. For example, if there is uplink resource, an empty MAC SDU or empty BSR MAC CE may be transmitted. If there is no uplink resource, the SR may be sent, and the network device allocates the uplink resource to the terminal according to the SR, and transmits an empty MAC SDU or empty BSR MAC CE using the uplink resource, so that the timer may be restarted.

It can be seen from the above description that, by using the scheme of the embodiment of the present invention, when the direct communication interface of the terminal has a service transmission requirement, the terminal can be prevented from entering a radio resource control idle state at the Uu interface, so as to better ensure the QoS requirement of the direct communication interface.

Referring to fig. 12, fig. 12 is a flowchart of an interface status maintenance method according to an embodiment of the present invention. With reference to fig. 12, the interface state maintenance method according to the embodiment of the present invention is applied to a network device, and includes:

step 1201, receiving indication information of the terminal.

Step 1202, determining whether the terminal has a requirement for data transmission and/or reception in the direct communication interface according to the indication information.

On the basis of the above embodiment, the method further comprises:

Wherein the target downlink data comprises: empty MAC SDUs or empty MAC PDUs.

It can be seen from the above description that, by using the scheme of the embodiment of the present invention, when the terminal direct communication interface has a service transmission requirement, the terminal can be prevented from entering a radio resource control idle state at the Uu interface, thereby better ensuring the QoS requirement of the direct communication interface and improving the user experience of the direct communication interface service.

Fig. 13 is a schematic diagram of an interface state maintaining apparatus according to an embodiment of the present invention, which is applied to a terminal. The interface state maintaining apparatus may include: a processing module 1301, configured to maintain an RRC state of the terminal at the Uu interface according to the following information: and the data transmission state of the terminal at the Uu interface and the data transmission state of the terminal at the direct communication interface.

the terminal transmits and/or receives data at the direct communication interface; a resource allocation pattern of the direct communication interface; wherein the data of the direct communication interface comprises user plane data and/or control plane data.

Wherein, in a case that the data transmission state of the terminal at the direct communication interface includes transmission and/or reception of data of the terminal at the direct communication interface, the processing module is specifically configured to:

Wherein, in a case that the data transmission state of the terminal at the direct communication interface includes sending and/or receiving of data of the terminal at the direct communication interface, the processing module is specifically configured to:

maintaining a second timer, and maintaining the RRC state of the terminal in the Uu interface in an RRC connected state when the second timer is overtime and the direct communication interface has a data transmission and/or reception requirement; under the condition that the second timer is overtime and the direct communication interface has no data transmission and/or reception requirements, the RRC state of the terminal on the Uu interface is converted into an RRC idle state or an RRC inactive state from an RRC connected state;

maintaining a second timer, and restarting the second timer at a timeout time of the second timer or within a first time period before the second timer times out if the direct communication interface satisfies the following conditions: the direct communication interface has data transmission and/or reception requirements;

Wherein, when the data transmission state of the terminal at the direct communication interface includes the resource allocation mode of the direct communication interface, the processing module is specifically configured to:

maintaining a second timer, and maintaining the RRC state of the terminal in the Uu interface in an RRC connected state if the second timer is overtime and the direct communication interface uses a network scheduled resource allocation mode or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation mode;

under the condition that the second timer is overtime and the direct communication interface does not use the resource allocation mode scheduled by the network or any radio bearer on the direct communication interface does not use the resource allocation mode scheduled by the network, the RRC state of the terminal on the Uu interface is converted into an RRC idle state or an RRC inactive state from an RRC connected state;

maintaining a second timer, and if target downlink data sent by network side equipment is received within a timeout time of the second timer or a first time period before the second timer is overtime, restarting the second timer; wherein the target downlink data is transmitted by the network side device when it is determined that the Uu interface has no data transmission and/or reception requirement and the direct communication interface uses a network scheduled resource allocation mode or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation mode;

Wherein, when the data transmission state of the terminal at the direct communication interface includes a resource allocation mode of the direct communication interface, the processing module is specifically configured to:

Wherein the Uu interface target logical channel comprises one or more of: a Uu interface dedicated traffic channel; a Uu interface dedicated control channel; a Uu interface common control channel; the direct communication interface target logical channel comprises one or more of: a direct communication interface traffic channel; a direct communication interface broadcasting a control channel; the direct communication interface controls a channel.

Wherein the target downlink data includes: empty MAC SDUs or empty MAC PDUs.

Wherein the target uplink data comprises: empty MAC SDU or empty MAC PDU; the target uplink control information includes an empty BSR MAC CE.

The apparatus provided in the embodiment of the present invention may implement the method embodiments, and the implementation principle and technical effects are similar, which are not described herein again.

Fig. 14 is a schematic diagram of an interface state maintenance apparatus according to an embodiment of the present invention, which is applied to a network device. The interface state maintaining apparatus may include: a receiving module 1401, configured to receive indication information of a terminal; a determining module 1402, configured to determine, according to the indication information, whether the terminal has a requirement for data transmission and/or reception in the direct communication interface.

Optionally, the apparatus further comprises:

the processing module is used for maintaining a second timer, sending target downlink data to the terminal at the timeout moment of the second timer or within a first time period before the second timer is overtime, and restarting the second timer;

Wherein the target downlink data comprises: empty MAC SDUs or empty MAC PDUs.

The apparatus provided in the embodiment of the present invention may implement the method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.

The embodiment of the invention also provides interface state maintenance equipment which is applied to the terminal. As shown in fig. 15, the interface state maintenance device according to the embodiment of the present invention includes: the processor 1500, which is used to read the program in the memory 1520, executes the following processes:

and maintaining the Radio Resource Control (RRC) state of the terminal at the Uu interface according to the following information:

A transceiver 1510 for receiving and transmitting data under the control of the processor 1500.

In fig. 15, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1500 and various circuits of memory represented by memory 1520 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1510 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 1530 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1500 is responsible for managing the bus architecture and general processing, and the memory 1520 may store data used by the processor 1500 in performing operations.

a resource allocation pattern of the direct communication interface;

The processor 1500 is further configured to read the program and execute the following steps:

maintaining a second timer, and restarting the second timer at a timeout time of the second timer or within a first time period before the second timer times out if the direct communication interface satisfies the following conditions: the direct communication interface has data sending and/or receiving requirements;

maintaining a second timer, and if target downlink data sent by network side equipment is received within a timeout time of the second timer or a first time period before the second timer is overtime, restarting the second timer; wherein the target downlink data is transmitted by the network side device when it is determined that the Uu interface has no data transmission and/or reception requirements and the direct communication interface uses a network scheduled resource allocation mode or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation mode;

Wherein the Uu interface target logical channel comprises one or more of:

Wherein the target downlink data includes: empty MAC SDUs or empty MAC PDUs.

The device provided by the embodiment of the present invention may implement the above method embodiment, and the implementation principle and technical effect are similar, which are not described herein again.

The embodiment of the invention also provides interface state maintenance equipment which is applied to network side equipment. As shown in fig. 16, the interface status maintenance device according to the embodiment of the present invention includes: the processor 1600, which is used to read the program in the memory 1620, executes the following processes:

receiving indication information of a terminal;

A transceiver 1610 for receiving and transmitting data under the control of the processor 1600.

In fig. 16, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by the processor 1600 and various circuits of the memory represented by the memory 1620 linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1610 can be a plurality of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 1600 is responsible for managing the bus architecture and general processing, and the memory 1620 may store data used by the processor 1600 in performing operations.

The processor 1600 is responsible for managing the bus architecture and general processing, and the memory 1620 may store data used by the processor 1600 in performing operations.

The processor 1600 is further configured to read the program and execute the following steps:

the target downlink data is sent by the network side equipment when the Uu interface is determined to have no data sending and/or receiving requirements but the terminal is determined to have the data sending and/or receiving requirements on the direct communication interface according to the indication information.

Wherein the target downlink data comprises: empty MAC SDUs or empty MAC PDUs.

The device provided in the embodiment of the present invention may implement the method embodiment, and the implementation principle and technical effect are similar, which are not described herein again.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the processes of the embodiment of the interface state maintenance method, and can achieve the same technical effects, and in order to avoid repetition, the computer program is not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit may be implemented in the form of hardware, or in the form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer-readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transceiving method according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the foregoing is directed to the preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the principles of the invention as set forth in the appended claims.

Claims

1. An interface state maintenance method is applied to a terminal, and is characterized by comprising the following steps:

the data transmission state of the terminal at the direct communication interface; or the data transmission state of the terminal at the Uu interface and the data transmission state of the terminal at the direct communication interface;

wherein the data of the direct communication interface comprises user plane data and/or control plane data;

in a case that the data transmission state of the terminal on the direct communication interface includes transmission and/or reception of data of the terminal on the direct communication interface, the maintaining of the radio resource control RRC state of the terminal on the Uu interface includes:

the maintaining of the first timer means that the first timer is started or restarted when the following conditions are met:

the MAC entity of the direct communication interface receives at least one item of MAC SDU from a target logical channel of the direct communication interface, and the MAC entity of the direct communication interface sends the MAC SDU aiming at the target logical channel of the direct communication interface; or the like, or a combination thereof,

a Media Access Control (MAC) entity of the Uu interface receives at least one item of MAC Service Data Unit (SDU) from a target logical channel of the Uu interface, and the MAC entity of the Uu interface sends the MAC SDU aiming at the target logical channel of the Uu interface; and the MAC entity of the direct communication interface receives the MAC SDU from the target logical channel of the direct communication interface, and the MAC entity of the direct communication interface sends at least one item of MAC SDU aiming at the target logical channel of the direct communication interface.

2. The method according to claim 1, wherein in the case that the data transmission state of the terminal on the direct communication interface includes transmission and/or reception of data by the terminal on the direct communication interface, maintaining the Radio Resource Control (RRC) state of the terminal on the Uu interface comprises:

respectively maintaining a second timer and a third timer, and under the condition that the second timer and the third timer are overtime, converting the RRC state of the terminal at the Uu interface from an RRC connected state to an RRC idle state or an RRC inactive state;

3. The method according to claim 1, wherein in the case that the data transmission state of the terminal on the direct communication interface includes transmission and/or reception of data by the terminal on the direct communication interface, maintaining the Radio Resource Control (RRC) state of the terminal on the Uu interface comprises:

4. The method according to claim 1, wherein in case that the data transmission state of the terminal on the direct communication interface comprises transmission and/or reception of data of the terminal on the direct communication interface, the maintaining of the radio resource control RRC state of the terminal on the Uu interface comprises:

5. The method according to claim 1, wherein in case that the data transmission state of the terminal on the direct communication interface comprises transmission and/or reception of data of the terminal on the direct communication interface, the maintaining of the radio resource control RRC state of the terminal on the Uu interface comprises:

6. The method according to claim 1, wherein in case that the data transmission state of the terminal on the direct communication interface comprises transmission and/or reception of data of the terminal on the direct communication interface, the maintaining of the radio resource control RRC state of the terminal on the Uu interface comprises:

7. The method according to claim 1, wherein in case that the data transmission state of the terminal on the direct communication interface comprises a resource allocation mode of the direct communication interface, the maintaining of the Radio Resource Control (RRC) state of the terminal on the Uu interface comprises:

8. The method according to claim 1, wherein in case that the data transmission state of the terminal on the direct communication interface includes a resource allocation mode of the direct communication interface, the maintaining of the Radio Resource Control (RRC) state of the terminal on the Uu interface comprises:

9. The method according to claim 1, wherein in case that the data transmission state of the terminal on the direct communication interface includes a resource allocation mode of the direct communication interface, the maintaining of the Radio Resource Control (RRC) state of the terminal on the Uu interface comprises:

10. The method according to claim 1, wherein in case that the data transmission state of the terminal on the direct communication interface includes a resource allocation mode of the direct communication interface, the maintaining of the Radio Resource Control (RRC) state of the terminal on the Uu interface comprises:

maintaining a second timer, and sending target uplink data or target uplink control information to network side equipment at the timeout moment of the second timer or within a first time period before the second timer is overtime so as to restart the second timer; wherein the target uplink data or target uplink control information is transmitted by the terminal when it is determined that the Uu interface has no data transmission and/or reception requirements and the direct communication interface uses a network scheduled resource allocation mode or at least one radio bearer on the direct communication interface uses a network scheduled resource allocation mode;

11. The method of claim 1,

the Uu interface target logical channel comprises one or more of:

a direct communication interface traffic channel; a direct communication interface broadcasts a control channel; the direct communication interface controls the channel.

12. The method according to claim 5 or 9, wherein the target downlink data comprises: empty MAC SDUs or empty MAC protocol data units PDU.

13. The method according to claim 6 or 10, wherein the target uplink data comprises: empty MAC SDUs or empty MAC PDUs; the target uplink control information includes an empty buffer status report BSR MAC control element CE.

14. The method according to claim 5 or 9, characterized in that the method further comprises:

and when the direct communication interface has the requirement of data transmission and/or reception, sending indication information to the network side equipment.

15. An interface state maintenance method is applied to network side equipment, and is characterized by comprising the following steps:

receiving indication information of a terminal;

determining whether the terminal has a requirement for data transmission and/or reception at a direct communication interface according to the indication information;

maintaining a Radio Resource Control (RRC) state of the terminal at the Uu interface according to the data transmission state of the terminal at the Uu interface and the data transmission state of the terminal at the direct communication interface;

16. The method of claim 15, wherein the target downlink data comprises: empty MAC SDUs or empty MAC PDUs.

17. An interface state maintenance device applied to a terminal, comprising:

the data transmission state of the terminal at the direct communication interface, or the data transmission state of the terminal at the Uu interface and the data transmission state of the terminal at the direct communication interface;

maintaining a first timer, and under the condition that the first timer is overtime, converting the RRC state of the terminal at the Uu interface from an RRC connected state to an RRC idle state or an RRC inactive state;

wherein the maintaining the first timer means starting or restarting the first timer when the following conditions are satisfied:

the MAC entity of the direct communication interface receives at least one item of MAC SDU from a target logical channel of the direct communication interface, and the MAC entity of the direct communication interface sends the MAC SDU aiming at the target logical channel of the direct communication interface; or the like, or, alternatively,

a Media Access Control (MAC) entity of the Uu interface receives at least one item of MAC Service Data Unit (SDU) from a Uu interface target logical channel, and the MAC entity of the Uu interface sends the MAC SDU aiming at the Uu interface target logical channel; and the MAC entity of the direct communication interface receives the MAC SDU from the target logical channel of the direct communication interface, and the MAC entity of the direct communication interface sends at least one item of MAC SDU aiming at the target logical channel of the direct communication interface.

18. An interface state maintenance device applied to a network side device, comprising:

the determining module is used for determining whether the terminal has the requirement of data transmission and/or reception at the direct communication interface according to the indication information;

the method comprises the steps that the Radio Resource Control (RRC) state of a terminal at a Uu interface is maintained according to the data transmission state of the terminal at the Uu interface and the data transmission state of the terminal at a direct communication interface;

19. An interface state maintenance device applied to a terminal, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

the processor is used for reading the program in the memory and executing the following processes:

in a case where the data transmission state of the terminal at the direct communication interface includes transmission and/or reception of data at the direct communication interface by the terminal, the processor is further configured to read the program in the memory, and perform the following processes:

the MAC entity of the direct communication interface receives the MAC SDU from the target logical channel of the direct communication interface, and the MAC entity of the direct communication interface sends at least one item of MAC SDU aiming at the target logical channel of the direct communication interface; or the like, or, alternatively,

a Media Access Control (MAC) entity of the Uu interface receives at least one item of MAC Service Data Unit (SDU) from a target logical channel of the Uu interface, and the MAC entity of the Uu interface sends the MAC SDU aiming at the target logical channel of the Uu interface; and the MAC entity of the direct communication interface receives at least one item of the MAC SDU from the target logical channel of the direct communication interface, and the MAC entity of the direct communication interface sends the MAC SDU aiming at the target logical channel of the direct communication interface.

20. The apparatus according to claim 19, wherein in case that the data transmission state of the terminal in the direct communication interface comprises transmission and/or reception of data by the terminal in the direct communication interface, the processor is further configured to read the program in the memory, and execute the following procedure:

21. The apparatus according to claim 19, wherein in case that the data transmission state of the terminal in the direct communication interface comprises transmission and/or reception of data by the terminal in the direct communication interface, the processor is further configured to read the program in the memory, and execute the following procedure:

22. The apparatus according to claim 19, wherein in case that the data transmission state of the terminal in the direct communication interface comprises transmission and/or reception of data by the terminal in the direct communication interface, the processor is further configured to read the program in the memory, and execute the following procedure:

23. The apparatus according to claim 19, wherein in case that the data transmission state of the terminal in the direct communication interface comprises transmission and/or reception of data by the terminal in the direct communication interface, the processor is further configured to read the program in the memory, and perform the following procedure:

24. The apparatus according to claim 19, wherein in case that the data transmission state of the terminal in the direct communication interface comprises transmission and/or reception of data by the terminal in the direct communication interface, the processor is further configured to read the program in the memory, and perform the following procedure:

25. The apparatus according to claim 19, wherein in case that the data transmission state of the terminal in the direct communication interface comprises a resource allocation mode of the direct communication interface, the processor is further configured to read a program in the memory, and perform the following procedures:

26. The apparatus according to claim 19, wherein in case that the data transmission state of the terminal at the direct communication interface comprises a resource allocation mode of the direct communication interface, the processor is further configured to read a program in the memory, and perform the following procedure:

27. The apparatus according to claim 19, wherein in case that the data transmission state of the terminal at the direct communication interface comprises a resource allocation mode of the direct communication interface, the processor is further configured to read a program in the memory, and perform the following procedure:

maintaining a second timer, and sending target uplink data or target uplink control information to network side equipment at the timeout moment of the second timer or within a first time period before the second timer is overtime so as to restart the second timer; wherein the target uplink data or target uplink control information is transmitted by the terminal under the condition that the terminal determines that the Uu interface has no data transmission and/or reception requirement and the direct communication interface uses a resource allocation mode scheduled by a network or at least one radio bearer on the direct communication interface uses a resource allocation mode scheduled by the network;

28. An interface state maintenance device applied to a network side device comprises: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

receiving indication information of a terminal;

determining whether the terminal has a requirement for data transmission and/or reception in a direct communication interface according to the indication information;

the processor is also used for reading the program in the memory and executing the following processes:

29. A computer-readable storage medium storing a program, wherein the program when executed by a processor implements the steps in the method of any one of claims 1 to 14; alternatively, the program when executed by a processor implements the steps in the method of any one of claims 15 to 16.