Method for configuring the link maximum transmission unit (MTU) in a user equipment (UE)
In a System Architecture Evolution/Long Term Evolution (SAE/LTE) radio network, the network is set to configure the link MTU in the UE for each bearer where the network-configured link MTU can represent an MTU of a path for a SAE bearer service in complete or part of a particular SAE/LTE network.
1. A method comprising:
configuring a link maximum transmission unit (MTU) in a user equipment (UE) adapted to connect to an System Architecture Evolution / Long Term Evolution (SAE/LTE) radio network, wherein configuring the link MTU in the UE comprises:
signaling the MTU supported by the SAE/LTE network to the UE, wherein:
when a transport layer protocol of the link has a Maximum Segment Size (MSS), the signaling configures the UE to select a transmit and/or a receive MSS based on the MTU signaled to the UE; and
when the transport layer protocol of the link lacks signaling of receive MSS, the signaling configures the UE to allow fragmentation of a transmitted datagram at a source based on the MTU signaled to the UE.
2. The method according to claim 1 , wherein the transport layer protocol supports signaling of the receive MSS and selection of the transit MSS.
3. The method according to claim 1 , wherein the transport layer protocol is Transmission Control Protocol (TCP) or Stream Control Transmission Protocol (SCTP).
4. The method according to claim 1 , wherein the transport layer protocol is UDP.
5. The method according to claim 1 , wherein the link MTU is signaled in a Non Access Stratum (NAS) message from a Mobility Management Entity (MME).
6. The method according to claim 1 , wherein the link MTU is signaled in a Radio Resource Control (RRC) message from an evolved Node B (eNB).
7. The method according to claim 1 , wherein the signaled link MTU is set to a highest value supported by the SAE/LTE network.
8. A user equipment (UE) adapted to connect to a System Architecture Evolution / Long Term Evolution (SAE/LTE) radio network, the UE comprising:
a receiver configured to receive data comprising a link maximum transmission unit (MTU) supported by the SAE/LTE network; and
a processing circuit configured to:
apply the link MTU received by the receiver, wherein:
when a transport layer protocol of the link has a Maximum Segment Size (MSS), the processing circuit selects a transmit and/or a receive MSS based on the MTU signaled to the UE; and
when the transport layer protocol of the link lacks signaling of receive MSS, the processing circuit allows fragmentation of a transmitted datagram at a source based on the MTU signaled to the UE.
9. The User equipment (UE) according to claim 8 , wherein the receiver is further configured to receive the link MTU in a Non Access Stratum (NAS) message.
10. The user equipment (UE) according to claim 8 , wherein the receiver is further configured to receive the link MTU in a Radio Resource Control (RRC) message.
11. A node in a System Architecture Evolution / Long Term Evolution (SAE/LIE) radio network, the node comprising:
processing circuitry; and
a transmitter operatively coupled to the processing circuitry and configured to configure a link maximum transmission unit (MTU) in a user equipment (UE) connected to the SAE/LTE radio network by signaling a MTU supported by the SAE/LTE network to the UE, wherein:
when a transport layer protocol of the link has a Maximum Segment Size (MSS), the signaling configures the UE to select a transmit and/or a receive MSS based on the MTU signaled to the UE; and
when the transport layer protocol of the link lacks signaling of receive MSS, the signaling configures the UE to all fragmentation of a transmitted datagram at a source based on the MTU signaled to the UE.
12. The node according to claim 11 , wherein the transmitter is further configured to signal the link MTU in a Non Access Stratum (NAS) message, and wherein the node comprises a Mobility Management Entity (MME) node.
13. The node according to claim 11 , wherein the transmitter is further configured to signal the link MTU in a Radio Resource Control (RRC) message, and wherein the node comprises an evolved Node B (eNB).
14. The node according to claim 11 , wherein the processing circuitry is further configured to set the signaled link MTU to a highest value supported by the SAE/LTE network.