Timing and cell specific system information handling for handover in evolved UTRA

Patent metadata

Field	Value
Publication number	US-9398511-B2
Application number	US-201414224016-A
Country	US
Kind code	B2
Filing date	Mar 24, 2014
Priority date	Mar 20, 2008
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

A method and apparatus for reducing handover time includes a wireless transmit receive unit receiving cell specific information in a downlink signal. The downlink signal is one of a set of signals included in a handover process.

First claim

What is claimed is:

1. A method of handover in a wireless transmit receive unit (WTRU), the method comprising:
receiving a handover signal from a second evolved Node B (eNB) associated with a source cell, the handover signal including a specific configuration of a first evolved Node B (eNB) associated with a target cell;
sending a random access preamble to the first eNB;
receiving a random access response from the first eNB;
implementing the configuration, at least in part, to the extent a system frame number (SFN) of the first eNB is not required, including deactivating semi-persistent scheduling (SPS);
receiving the SFN of the first eNB; and
further implementing the configuration utilizing the SFN of the first eNB, including activating SPS.

2. The method of claim 1 , wherein the configuration that is implemented to the extent the SFN of the first eNB is not required is, at least in part, a default configuration.

3. The method of claim 1 , wherein the SFN of the first eNB is received after a predetermined amount of time.

4. The method of claim 1 , wherein the SFN of the first eNB is received after a predetermined number of subframes.

5. The method of claim 4 , further comprising initiating reception and processing of a dedicated broadcast channel (D-BCH) of the first eNB after receiving the handover signal.

6. The method of claim 5 , wherein the predetermined number of subframes is a function of a number of a primary broadcast channel (P-BCH) transmission time intervals (TTIs) and a number of D-BCH periods.

7. A wireless transmit receive unit (WTRU), comprising:
a receiver configured to:
receive a handover signal from a second evolved Node B (eNB) associated with a source cell, the handover signal including a specific configuration of a first evolved Node B (eNB) associated with a target cell; and
receive a random access response from the first eNB; and

at least a processor configured to:
initiate sending a random access preamble to the first eNB;
implement the configuration, at least in part, to the extent a system frame number (SFN) of the first eNB is not required, including deactivating semi-persistent scheduling (SPS), the receiver being further configured to receive the SFN of the first eNB; and
further implement the configuration utilizing the SFN of the first eNB, including activating SPS.

8. The WTRU of claim 7 , wherein the configuration that is implemented to the extent the SFN of the first eNB is not required is, at least in part, a default configuration.

9. The WTRU of claim 7 , wherein the receiver is further configured such that the SFN of the first eNB is received after a predetermined amount of time.

10. The WTRU of claim 7 , wherein the receiver is further configured such that the SFN of the first eNB is received after a predetermined number of subframes.

11. The WTRU of claim 10 , wherein the processor is further configured to initiate reception and processing of a dedicated broadcast channel (D-BCH) of the first eNB after receiving the handover signal.

12. The WTRU of claim 11 , wherein the predetermined number of subframes is a function of a number of a primary broadcast channel (P-BCH) transmission time intervals (TTIs) and a number of D-BCH periods.

13. A method of handover in a wireless transmit receive unit (WTRU), the method comprising:
receiving a handover signal from a second evolved Node B (eNB) associated with a source cell, the handover signal including a specific configuration of a first evolved Node B (eNB) associated with a target cell;
sending a random access preamble to the first eNB;
receiving a random access response from the first eNB;
implementing the configuration, at least in part, to the extent a system frame number (SFN) of the first eNB is not required, including deactivating discontinuous reception (DRX);
receiving the SFN of the first eNB; and
further implementing the configuration utilizing the SFN of the first eNB, including activating DRX.

14. The method of claim 13 , wherein the configuration that is implemented to the extent the SFN of the first eNB is not required is, at least in part, a default configuration.

15. The method of claim 13 , wherein the SFN of the first eNB is received after a predetermined amount of time.

16. The method of claim 13 , wherein the SFN of the first eNB is received after a predetermined number of subframes.

17. The method of claim 16 , further comprising initiating reception and processing of a dedicated broadcast channel (D-BCH) of the first eNB after receiving the handover signal.

18. The method of claim 17 , wherein the predetermined number of subframes is a function of a number of a primary broadcast channel (P-BCH) transmission time intervals (TTIs) and a number of D-BCH periods.

19. A wireless transmit receive unit (WTRU), comprising:
a receiver configured to:
receive a handover signal from a second evolved Node B (eNB) associated with a source cell, the handover signal including a specific configuration of a first evolved Node B (eNB) associated with a target cell; and
receive a random access response from the first eNB; and

at least a processor configured to:
initiate sending a random access preamble to the first eNB;
implement the configuration, at least in part, to the extent a system frame number (SFN) of the first eNB is not required, including deactivating discontinuous reception (DRX), the receiver being further configured to receive the SFN of the first eNB; and
further implement the configuration utilizing the SFN of the first eNB, including activating DRX.

20. The WTRU of claim 19 , wherein the configuration that is implemented to the extent the SFN of the first eNB is not required is, at least in part, a default configuration.

21. The WTRU of claim 19 , wherein the receiver is further configured such that the SFN of the first eNB is received after a predetermined amount of time.

22. The WTRU of claim 19 , wherein the receiver is further configured such that the SFN of the first eNB is received after a predetermined number of subframes.

23. The WTRU of claim 22 , wherein the processor is further configured to initiate reception and processing of a dedicated broadcast channel (D-BCH) of the first eNB after receiving the handover signal.

24. The WTRU of claim 23 , wherein the predetermined number of subframes is a function of a number of a primary broadcast channel (P-BCH) transmission time intervals (TTIs) and a number of D-BCH periods.

25. A method of handover in a wireless transmit receive unit (WTRU), the method comprising:
receiving a handover signal from a second evolved Node B (eNB) associated with a source cell, the handover signal including a specific configuration of a first evolved Node B (eNB) associated with a target cell;
sending a random access preamble to the first eNB;
receiving a random access response from the first eNB;
implementing the configuration, at least in part, to the extent a system frame number (SFN) of the first eNB is not required, including deactivating layer 1 (L1) feedback;
receiving the SFN of the first eNB; and
further implementing the configuration utilizing the SFN of the first eNB, including activating L1 feedback.

26. The method of claim 25 , wherein the configuration that is implemented to the extent the SFN of the first eNB is not required is, at least in part, a default configuration.

27. The m

Assignees

• Interdigital Patent Holdings

Inventors

• Zhang Guodong
• Wang Jin
• Wang Peter S
• Terry Stephen E

Classifications

• H04W36/38

  by fixed network equipment · CPC title

• H04W76/28 Primary

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title

• H04W92/20

  between access points · CPC title

• H04W76/20

  Manipulation of established connections · CPC title

• H04W36/0072 Primary

  of resource information of target access point · CPC title