Method, network system and destination network for transmitting QoS during a handover process between systems

A destination network, comprising:

• a mobility management network element, adapted to acquire a first Quality of Service (QoS) of a User Equipment (UE) during a handover process of the UE from a first network to a second network, and transmit the first QoS to at least one of an access network and a user plane network element, wherein the first network is a 2G/3G system, the second network is a System Architecture Evolution (SAE) system, and the mobility management network element is adapted to use default QoS configured in the mobility management network element as the first QoS of the UE, wherein the mobility management network element is further adapted to acquire subscribed QoS of the UE from subscription database to compare the subscribed QoS of the UE with the first QoS;
• and if a comparison result indicates that the subscribed QoS of the UE and the first QoS are inconsistent, to transmitting the subscribed QoS of the UE to the at least one of the second network access network and the user plane network element;
• the access network and/or the user plane network element, adapted to receive the first QoS transmitted by the mobility management network element and to receive the subscribed QoS of the UE transmitted by the mobility management network element.

A method for transmitting Quality of Service (QoS) parameter during a handover process between systems, wherein during the handover process of a User Equipment (UE) from a first network to a second network, the method comprises:

• receiving, by a second network access network, a first QoS of the UE from a second network mobility management network element, wherein the first network is a 2G/3G system, the second network is a System Architecture Evolution (SAE) system, and the first QoS is default QoS configured in the second network mobility management network element˜
• receiving, by the second network access network a subscribed QoS of the UE from the second network mobility management network element, wherein the subscribed QoS of the UE is sent by the second network mobility management network element after the handover process, if the subscribed QoS of the UE and the first QoS are inconsistent.

A second network access network, comprising:

• during a handover process of a User Equipment (UE) from a first network to a second network,
• a receiver, adapted to receive a first Quality of Service (QoS) of a UE from a second network mobility management network element, wherein the first network is a 2G/3G system, the second network is a System Architecture Evolution (SAE) system, and the first QoS is default QoS configured in the second network mobility management network element, and further adapted to receive a subscribed QoS of the UE from the second network mobility management network element, wherein the subscribed QoS of the UE is sent by the second network mobility management network element after the handover process, if the subscribed QoS of the UE and the first QoS are inconsistent.