Bearer management apparatus and method, and communication system

1. A bearer management apparatus configured in a user equipment (UE) configured with dual connectivity, comprising:

a receiver configured to receive an indication message, sent by a base station, for changing a bearer type of a bearer or releasing the bearer under dual connectivity; and

a processor circuit, configured to change the bearer type of the bearer or release the bearer according to the indication message, wherein the indication message comprises first configuration information configured or reconfigured by the base station for a logical channel identity corresponding to the bearer, the first configuration information contains a logicalChannelldentity in an information element DRB-ToAddMod, and a logical channel identity corresponding to the logicalChannelldentity is present when the bearer type changes for UE(s) configured with dual connectivity;

or the indication message comprises second configuration information configured or reconfigured by the base station for a radio bearer identity corresponding to the bearer, the second configuration information contains an eps-Bearldentity in the information element DRB-ToAddMod, and an EPS bearer identity corresponding to the eps-Bearldentity is present when the bearer type changes for UE(s) configured with dual connectivity;

or the indication message comprises third configuration information configured or reconfigured by the base station for a Packet Data Convergence Protocol (PDCP) entity corresponding to the bearer, the third configuration information includes a pdcp-Config in the information element DRB-ToAddMod, and PDCP information corresponding to the pdcp-Config is present when the bearer type changes for UE(s) configured with dual connectivity.

2. The bearer management apparatus according to claim 1 , further comprising:

a transmitter, configured to send a response message to the base station.

3. The bearer management apparatus according to claim 1 , wherein the processor circuit is further configured to configure or reconfigure the logical channel identity corresponding to the bearer according to the first configuration information, or configure or reconfigure the radio bearer identity corresponding to the bearer according to the second configuration information, or configure or reconfigure the PDCP entity corresponding to the bearer according to the third configuration information.

4. A bearer management apparatus configured in a user equipment (UE) configured with dual connectivity, comprising:

a receiver, configured to receive an indication message, sent by a base station, for changing a bearer type of a bearer or releasing the bearer under dual connectivity; and

a processor circuit configured to:

change the bearer type of the bearer or release the bearer according to the indication message, wherein the indication message comprises fourth configuration information for releasing the bearer under dual connectivity; and

release a Data Radio Bearer (DRB) corresponding to an Evolved Packet System (EPS) bearer identity according to the fourth configuration information, when the EPS bearer identity is not contained in an information element DRB-ToAddMod while belonging to the current configuration of the UE configured with dual connectivity, or release the DRB corresponding to the EPS bearer identity according to the fourth configuration information, when the EPS bearer identity is not contained in the information element DRB-ToAddMod while belonging to the current configuration of the UE, and the indication message including the fourth configuration information is a first Radio Resource Control (RRC) connection reconfiguration message after an RRC connection reestablishment, and the UE is configured with dual connectivity.

5. The bearer management apparatus according to claim 4 , further comprising a transmitter configured to send a response message to the base station.

6. A communication system, comprising:

a user equipment (UE) configured with dual connectivity, configured to receive an indication message, sent by a base station, for changing a bearer type of a bearer or releasing the bearer under dual connectivity; change the bearer type of the bearer or release the bearer according to the indication message; and send a response message to the base station, wherein the indication message comprises first configuration information configured or reconfigured by the base station for a logical channel identity corresponding to the bearer, the first configuration information contains a logicalChannelldentity in an information element DRB-ToAddMod, and a logical channel identity corresponding to the logicalChannelldentity is present when the bearer type changes for UE(s) configured with dual connectivity;

or the indication message comprises second configuration information configured or reconfigured by the base station for a radio bearer identity corresponding to the bearer, the second configuration information contains an eps-Bearldentity in the information element DRB-ToAddMod, and an EPS bearer identity corresponding to the eps-Bearldentity is present when the bearer type changes for UE(s) configured with dual connectivity;

or the indication message comprises third configuration information configured or reconfigured by the base station for a Packet Data Convergence Protocol (PDCP) entity corresponding to the bearer, the third configuration information includes a pdcp-Config in the information element DRB-ToAddMod, and PDCP information corresponding to the pdcp-Config is present when the bearer type changes for UE(s) configured with dual connectivity.

7. A communication system comprising:

a base station; and

a user equipment (UE) with dual connectivity configured to:

receive an indication message, sent by the base station, for changing a bearer type of a bearer or releasing the bearer under dual connectivity;

change the bearer type of the bearer or release the bearer according to the indication message;

send a response message to the base station, wherein the indication message comprises fourth configuration information for releasing the bearer under dual connectivity; and

release a Data Radio Bearer (DRB) corresponding to an Evolved Packet System (EPS) bearer identity according to the fourth configuration information, when the EPS bearer identity is not contained in an information element DRB-ToAddMod while belonging to the current configuration of the UE configured with dual connectivity;

or, release the DRB corresponding to the EPS bearer identity according to the fourth configuration information, when the EPS bearer identity is not contained in the information element DRB-ToAddMod while belonging to the current configuration of the UE, and the indication message including the fourth configuration information is a first Radio Resource Control (RRC) connection reconfiguration message after an RRC connection reestablishment, and the UE is configured with dual connectivity.