Reducing energy consumption in mobile telecommunications

• US 8,780,742 B2
• Filed: 11/10/2010
• Issued: 07/15/2014
• Est. Priority Date: 11/11/2009
• Status: Expired due to Fees

• Current Assignee: Vodafone Group PLC
• Original Assignee: Vodafone Group PLC
• Inventors: McWilliams, Brendan, Dominguez Romero, Francisco Javier, Le Pezennec, Yannick
• Primary Examiner(s): Javaid, Jamal
• Application Number:
  US12/943,257
• Publication Number:
  US 20110194429A1
• Time in Patent Office: 1,343 Days
• Field of Search: 370/252, 370/229, 370/311, 370/335, 370/389, 370/338, 370/336, 370/328, 455/574, 455/572, 455/561, 455/423, 455/334
• US Class Current: 370/252
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 52/0232 according to average transmission signal activity
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Method and network element for reducing energy consumption in WCDMA cells of a mobile network, the method comprising: monitoring traffic conveyed in the traffic channels of a cell; analyzing certain predetermined parameters in the monitored traffic; determining whether said predetermined parameters meet corresponding predetermined conditions; and when said predetermined conditions are met, switching off continuous transmission of common channels and facilitating the intermittent transmission of the common channels during one or more transmission events, thereby causing the cell to enter a cell standby mode.

Claims

1. A method for reducing energy consumption in Wideband Code Division Multiple Access (WCDMA) cells of a mobile network, the method including:

monitoring, using a Radio Network Controller (RNC), traffic conveyed in traffic channels of a WCDMA cell of the mobile network;

analyzing certain predetermined parameters in the monitored traffic;

determining whether said predetermined parameters meet corresponding predetermined conditions; and

when said predetermined conditions are met, switching off continuous transmission of common channel control signaling at a normal rate and causing the WCDMA cell to enter a cell standby mode comprising one or more intermittent transmission events during each of which intermittent transmission of the common channel control signaling is facilitated in which the common channel control signaling is transmitted at the normal rate in a first plurality of consecutive frames then not transmitted in a subsequent second plurality of consecutive frames,

whereby each of one or more mobile terminals in idle mode camped in the WCDMA cell and each of one or more mobile terminals in idle mode or connected mode in neighboring cells to the WCDMA cell is enabled to discover that the WCDMA cell has cell standby mode capabilities enabled or is in the cell standby mode.

2. The method according to claim 1, wherein the intermittent transmission is periodic having a characteristic period P_KA with a duration corresponding to a number of frames in the first and second pluralities of consecutive frames.

3. The method according to claim 1, wherein the one or more intermittent transmission events includes a plurality of transmission events, wherein each transmission event has a characteristic duration T_KA during which the common channel control signaling is transmitted at the normal rate, and wherein said characteristic duration of each transmission event is less than a duration of a characteristic period P_KA for the transmission events.

4. The method according to claim 1, wherein the predetermined conditions are met when no data is carried in the traffic channels of the WCDMA cell during a determined trigger time T_TR.

5. The method according to claim 1, wherein the predetermined conditions are analyzed by the RNC of a Node B in charge of the WCDMA cell, and wherein the predetermined parameters are parameters of traffic monitored in cells of that RNC.

6. The method according to claim 5, wherein the predetermined parameters include at least one of the following:

connection setup requests;

release requests; and

Uplink (UL) and Downlink (DL) data traffic volume.

7. The method according to claim 1, further comprising whenever a paging request is received by the WCDMA cell in the standby mode, resuming a normal mode of operation of said WCDMA cell.

8. The method according to claim 1, further comprising whenever a valid connection request is received by the WCDMA cell in the standby mode, resuming a normal mode of operation of said WCDMA cell.

9. The method according to claim 1, further comprising whenever a mobile terminal with a Cell Dedicated Channel (Cell_DCH) connection is performing a handover to a neighbouring target WCDMA cell in the standby mode, resuming a normal mode of operation of said target WCDMA cell.

10. The method according to claim 1, further comprising whenever a mobile terminal with a Cell Dedicated Channel (Cell_DCH) connection signals a measurement report of the WCDMA cell in the standby mode, resuming a normal mode of operation of said WCDMA cell.

11. The method according to claim 1, wherein when transmitting the common channel control signaling during a transmission time T_KA, Common Pilot Channel (CPICH) and Synchronization Channel (SCH) transmissions are started before transmission of Broadcast Channel (BCH) data on Primary Common Control Physical Channel (P-CCPCH).

12. The method according to claim 1, further comprising informing each of the one or more mobile terminals in idle mode camped in the WCDMA cell and each of the one or more mobile terminals in idle or connected mode located in the neighboring cells to the WCDMA cell that the WCDMA cell has cell standby mode capabilities enabled.

16. The method of claim 2, wherein each P_KA comprises a transmission period and a non-transmission period.

17. The method of claim 16, wherein the standby mode has at least two P_KA periods.

18. The method of claim 1, wherein the intermittent transmission comprises a transmission period and a non-transmission period.

19. The method of claim 18, wherein the standby mode has at least two intermittent transmissions.

13. A network element for reducing energy consumption in Wideband Code Division Multiple Access (WCDMA) cells of a mobile network, the network element including:

a Radio Network Controller (RNC) configured for monitoring traffic conveyed in traffic channels of a WCDMA cell of the mobile network belonging to a Node B connected to the RNC, the RNC being operable to;

analyze certain predetermined parameters in the monitored traffic;

determine whether said predetermined parameters meet corresponding predetermined conditions;

when said predetermined conditions are met, directing the Node B to switch off continuous transmission of common channel control signaling at a normal rate and cause the WCDMA cell to enter a cell standby mode comprising intermittent transmission of the common channel control signaling by the Node B in which the common channel control signaling is transmitted at the normal rate in a first plurality of consecutive frames then not transmitted in a subsequent second plurality of consecutive frames that is facilitated during one or more transmission events,

wherein each of one or more mobile terminals in idle mode camped in the WCDMA cell and each of one or more mobile terminals in idle mode or connected mode in neighboring cells to the WCDMA cell is enabled to discover that the WCDMA cell has cell standby mode capabilities enabled or is in the cell standby mode.

14. The network element according to claim 13, wherein the predetermined conditions are met when no data is carried in the traffic channels of the WCDMA cell during a determined trigger time T_TR.

15. The network element according to claim 13, wherein the RNC is further configured to, whenever a paging request is received by the WCDMA cell in the standby mode, direct that a normal mode of operation of said WCDMA cell be resumed.

20. A system for reducing energy consumption in Wideband Code Division Multiple Access (WCDMA) cells of a mobile network, the system comprising:

a network element including a Radio Network Controller (RNC) configured to monitor traffic conveyed in traffic channels of a WCDMA cell of the mobile network belonging to a Node B connected to the RNC, the RNC being operable to;

analyze certain predetermined parameters in the monitored traffic,

determine whether said predetermined parameters meet corresponding predetermined conditions, and

when said predetermined conditions are met, directing the Node B to switch off continuous transmission of common channel control signaling at a normal rate and cause the WCDMA cell to enter a cell standby mode comprising intermittent transmission of the common channel control signaling by the Node B in which the common channel control signaling is transmitted at the normal rate in a first plurality of consecutive frames then not transmitted in a subsequent second plurality of consecutive frames that is facilitated during one or more transmission events; and

a plurality of mobile terminals including one or more mobile terminals in idle mode camped in the WCDMA cell and one or more mobile terminals in idle or connected mode located in neighboring cells to the WCDMA cell,

wherein each of the plurality of mobile terminals is configured to discover whether the WCDMA cell has cell standby mode capabilities enabled or is in the cell standby mode.