Infrastructure equipment, mobile communications network and method for reducing overhead of signaling transmissions and processing

Patent metadata

Field	Value
Publication number	US-10383052-B2
Application number	US-201816145926-A
Country	US
Kind code	B2
Filing date	Sep 28, 2018
Priority date	Apr 22, 2013
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

A communications device establishes a communications context for communicating data packets using a packet communications bearer from the communications device via a mobile communications network. A controller of the communications device is configured to identify that the communications device can enter a stasis state because no data packets are available for transmission for a predetermined time via the packet communications bearer or there are no data packets to receive via the packet communications bearer, to transmit a stasis state message to the mobile communications network, and to store information relating to the communications context associated with the packet communications bearer in a data store. The stored information can be used by the controller to re-establish the packet communications bearer to transmit and/or receive data packets using the packet communications bearer, the communications device thereby entering the stasis state.

First claim

What is claimed is:

1. An infrastructure equipment for forming part of a mobile communications network, the infrastructure equipment comprising:
a transmitter configured to transmit data to communications devices via a wireless access interface;
a receiver configured to receive data transmitted from the communications devices via the wireless access interface; and
a controller configured to:
control the transmitter and the receiver to form the wireless access interface,
receive one or more signaling messages from a communications device and, in response, establish a communications context for communicating data packets via a packet communications bearer via the mobile communications network,
receive a stasis state message from the communications device for which the context has been established, the stasis state message indicating that the communications device wishes to enter a stasis state, wherein during the stasis state, information relating to the communications context associated with the packet communications bearer is stored and radio resources associated with the communications context are configured to be released,
transmit a stasis state confirm message to the communications device, and
store information relating to the communications context established for the communications devices and associated with the packet communications bearer in a data store, wherein the stored information is configured to be used by the controller to re-establish the same packet communications bearer to transmit data packets via the same packet communications bearer,

wherein, when the communications device is in the stasis state, the controller is further configured, in combination with the receiver, to:
transmit a connection re-establishment message to the communications device,
receive a connection re-establishment complete message from the communications device, and
re-establish the same packet communications bearer in the cell.

2. The infrastructure equipment of claim 1 , wherein the controller is configured in response to the stasis state message to:
store, with the information relating to the communications context, a network terminal identifier provided to the communications device for requesting communications resources when the communications context was established;
receive a request to re-connect message from the communications device, the request to re-connect message including the network terminal identifier;
recognise the network terminal identifier in response to receiving the request to re-connect message from the communications device;
retrieve the information relating to the communications context of the communications device from the data store;
re-establish the communications context of the communications device; and
communicate data packets received from the communications device via the wireless access interface and the mobile communications network via the packet communications bearer.

3. The infrastructure equipment of claim 1 , wherein the information relating to the communications context which is stored by the controller in the data store includes one or more sequence numbers associated with one or more protocols of a protocol stack which forms the packet communications bearer to the effect that, when the communications device moves from the stasis state to the connected state, the stored sequence numbers can be restored to the one or more protocols of the protocol stack to transmit or receive data packets via the wireless access interface and the packet communications bearer.

4. The infrastructure equipment of claim 3 , wherein the information relating to the context which is stored by the controller in the data store includes one or more of a sequence number associated with a radio link control protocol, a packet data communications protocol or a configuration of a medium access control layer.

5. The infrastructure equipment of claim 3 , wherein the information relating to the context which is stored by the controller in the data store includes a sequence number and a cyphering key associated with a sequence context.

6. The infrastructure equipment of claim 1 , wherein the infrastructure equipment is configured to operate in accordance with a 3GPP Long Term Evolution network, the terminal identification number of the communications device being a Cell-Radio Network Terminal Identifier, C-RNTI, and the packet communications bearer is an Enhanced Packet System communications bearer.

7. A mobile communications network including the infrastructure equipment of claim 1 .

8. A method of communicating data packets from an infrastructure equipment via a mobile communications network, the method comprising:
receiving one or more signaling messages from a communications device;
in response to the received signaling messages, establishing a communications context for communicating data packets using a packet communications bearer via the mobile communications network;
receiving a stasis state message from the communications device for which the context has been established, the stasis state message indicating that the communications device wishes to enter a stasis state, wherein during the stasis state, information relating to the communications context associated with the packet communications bearer is stored, and radio resources associated with the communications context are configured to be released;
transmitting a stasis state confirm message to the communications device; and
storing information relating to the communications context established for the communications devices and associated with the packet communications bearer in a data store, wherein the stored information is configured to be used by the controller to re-establish the packet communications bearer to transmit data packets using the packet communications bearer,
wherein, when the communications device is in the stasis state, the method further comprises:
transmitting a connection re-establishment message to the communications device,
receiving a connection re-establishment complete message from the communications device, and
re-establishing the same packet communications bearer in the cell.

9. The method of claim 8 , wherein storing information relating to the communications context established for the communications devices comprises:
in response to the stasis state message storing, with the information relating to the communications context, a network terminal identifier provided to the communications device for requesting communications resources when the communications context was established;
receiving a request to re-connect message from the communications device, the request to re-connect message including the network terminal identifier;
recognizing the network terminal identifier in response to receiving the request to re-connect message from the communications device;
retrieving the information relating to the communications context of the communications device from the data store; and
re-establishing the communications context of the communications device to communicate data packets received from the communications device via the wireless access interface and the mobile communications network via the packet communications bearer.

10. The method of claim 8 , wherein storing information relating to the communications context established for the communications devices and associated with the packet communications bearer in a data store comprises:
storing in the data store one or more sequence numbers associated with one or more protocols of a protocol stack which forms the packet communications bearer to the effect that, when the communications device moves from the stasis state to the connect

Assignees

• Sony Corp

Inventors

• Richards Derek John

Classifications

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title

• H04W52/0241 Primary

  where no transmission is received, e.g. out of range of the transmitter · CPC title

• H04W76/12

  Setup of transport tunnels · CPC title

• H04W76/19

  Connection re-establishment · CPC title

• H04W52/0251

  using monitoring of local events, e.g. events related to user activity · CPC title