Method and system for performing relocation or anchoring in a wireless telecommunication network

• US 20050036462A1
• Filed: 07/29/2004
• Published: 02/17/2005
• Est. Priority Date: 02/08/2002
• Status: Abandoned Application

• Current Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Original Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Inventors: Wigard, Jeroen, Sillasto, Eero
• Application Number:
  US10/901,356
• Publication Number:
  US 20050036462A1
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04W 36/02 Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
• CPC Class Codes: H04W 36/38 by fixed network equipment

Abstract

The present invention concerns a method and system for avoiding unnecessary handovers, relocations and/or anchoring during packet calls in a wireless telecommunication system. Data to be sent to a mobile terminal is stored in a data buffer. The data is sent to the mobile terminal when the amount of data in the buffer exceeds a predetermined threshold value. When a relocation or anchoring request is received, relocation or anchoring is performed only if one or more conditions are fulfilled. The conditions are preferably timers or adaptive thresholds. In a preferred embodiment, anchoring is performed only if a first timer has expired and relocation is performed only if the first and the second timers have both expired. When a handover is done, it triggers either anchoring or relocation. Therefore, the present invention lowers the number of handovers needed, and thus the number of anchoring and relocation cases.

Claims

1. A method for avoiding unnecessary handovers, relocations and/or anchoring during packet calls in a wireless telecommunication system,

storing data to be sent to a mobile terminal in a data buffer;

characterised in that the method further comprises the steps of;

sending the data from the buffer to the mobile terminal when the amount of data in the buffer exceeds a predetermined threshold value;

receiving a relocation or anchoring request; and

performing relocation or anchoring only if one or more conditions are fulfilled.

2. The method according to claim 1, characterised in that when the predetermined threshold value is exceeded, and the data is sent to the mobile terminal, the method comprises the steps of:

starting a first timer for carrying out a relocation or an anchoring procedure; and

when relocation or anchoring is requested; and

performing relocation or anchoring only if the first timer has expired.

3. The method according to claim 1, characterised in that when the predetermined threshold value is exceeded, and the data is sent to the mobile terminal, the method comprises the steps of:

starting a first timer and a second timer for carrying out a relocation or an anchoring procedure; and

when relocation or anchoring is requested;

performing anchoring only if the first timer has expired;

or

performing relocation only if the first and the second timers have expired.

4. The method according to claim 2, characterised in that the method further comprises the step of:

if the first timer has not expired, denying a hard handover if the signal level is adequate, or if it is not a silent period.

5. The method according to claim 2, characterised in that the method further comprises the steps of:

storing the relocation or anchoring request on a memory; and

re-evaluating the request when the first and/or second timers have expired.

6. The method according to claim 2, characterised in that the method comprises the step of:

starting the first and/or the second timer again when relocation or anchoring is performed.

7. The method according to claim 1, characterised in that the method comprises the steps of:

setting a first adaptive threshold for carrying out a relocation or an anchoring procedure; and

when relocation or anchoring is requested; and

performing relocation or anchoring only if the first adaptive threshold is triggered.

8. The method according to claim 1, characterised in that the method comprises the steps of:

setting a first and a second adaptive threshold values for carrying out a relocation or an anchoring procedure; and

when relocation or anchoring is requested;

performing anchoring only if the first adaptive threshold is triggered;

or

performing relocation only if the first and the second adaptive thresholds are triggered.

9. The method according to claim 1, characterised in that allowing relocation or anchoring even if one or more conditions are not fulfilled if:

experiencing a rapid signal field strength drop;

or

a gap in the transmission occurs.

10. A system for avoiding unnecessary handovers, relocations and/or anchoring during packet calls in a wireless telecommunication system, the wireless telecommunication system comprising:

a mobile terminal (UE) to which packet calls are established;

a network node (RNC) containing a data buffer (BUF), the data buffer (BUF) comprising the data to be sent to the mobile terminal (UE) in one or more packet calls;

characterised in that the system further comprises;

one or more condition parameters (COND) for carrying out a relocation or an anchoring procedure; and

means (DM) for discarding the relocation or anchoring request if one or more conditions (COND) are not fulfilled.

11. The system according to claim 10, characterised in that the condition parameters comprise the first (T₁) and the second (T₂) timer.

12. The system according to claim 10, characterised in that the system comprises means (RM) for resetting the first (T₁) and the second timer (T₂).

13. The system according to claim 10, characterised in that the condition parameters comprise the first (H₁) and the second (H₂) adaptive threshold.

14. The system according to claim 13, characterised in that the first (H₁) and the second (H₂) adaptive thresholds refer to adaptive hysteresis.

15. The system according to claim 10, characterised in that the system further comprises a memory (MEM) for storing anchoring and/or relocation requests.