Optimized delay

• US 9,107,156 B2
• Filed: 12/15/2010
• Issued: 08/11/2015
• Est. Priority Date: 12/16/2009
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Folkstedt, Bjorn, Ankel, Par, Lindskog, Jan
• Primary Examiner(s): Masur, Paul H
• Assistant Examiner(s): JAHANGIR, KABIR U
• Application Number:
  US13/516,866
• Publication Number:
  US 20120275382A1
• Time in Patent Office: 1,700 Days
• Field of Search: 370/310.2, 370/328, 370/330, 370/331, 455/422.1, 455/424, 455/442
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks

Abstract

A method for adjusting a timing offset value (CO) for a receiver (Node-B) is provided, the receiver being adapted to controlling and receiving reverse radio Sink transmissions from a transmitter (UE) according to predetermined response time requirements. The method comprising the steps of—estimating (11) at least one time budget map (TBM—116, 116′) according to which the available processing time in the receiver is given as a function of the possible timing off-set value (CO); —determining (15) a given timing offset value (CO—106) for the radio fink (RL) of the transmitter in accordance with the estimated time budget map (TBM), such as to provide an optimized offset (CO) value for the base station; —assigning (17) the determined timing offset value (CO) to the radio link.

Claims

1. A method for adjusting a timing offset value for a base station, the base station being adapted for controlling and receiving uplink radio link transmissions from a plurality of user entities (UE) according to predetermined response time requirements,

the method comprising the steps of:

estimating at least one time budget map according to which the available processing time in the base station is given as a function of the possible timing offset value;

determining a given timing offset value for the uplink radio link of a user entity from the plurality of user entities in accordance with the estimated time budget map; and

assigning the determined timing offset value to the radio link,

wherein the assignment of the timing offset value is optimized such that a base station processing time is above a minimum supported base station processing time, and wherein the timing offset for each new user entity is further arranged such that a substantially even distribution over time is accomplished considering previously assigned user entities in a cell associated with the base station.

2. The method according to claim 1, wherein a number of recurrent peaks and their associated timing offset values are estimated in the time budget map.

3. The method according to claim 1, the optimizing the offset value includes comparing the time budget map with a minimum supported base station processing time for the base station.

4. The method according to claim 1, wherein the time budget map comprises a generalized map which pertains to a predetermined location, or a set of locations, in a cell associated with the base station.

5. The method according to claim 1, wherein a plurality of time budget maps are estimated and wherein each respective time budget map is established for timing conditions which apply for a given user entity or given set of user entities.

6. The method according to claim 1, wherein a radio network control node is interacting with the radio base station and wherein the timing offset value is controlled by the radio network control node.

7. The method according to claim 1, wherein the assignment of the timing offset value is performed such that base station processing time is not greater than a first pre-determined distance from an upper limit corresponding to the peaks of the time budget map of the radio link.

8. The method according to claim 1, wherein an initial timing offset allocation is chosen substantially centred between a position in the time budget map where a peak is found and a position where a minimum supported processing time is found.

9. The method according to claim 1, wherein the timing offsets of the radio links are skewed in time with different starting points in relation to one another.

10. The method according to claim 1, wherein a new offset value is reassigned after a delay adapting for a changed location of a user entity or for obtaining a different distribution of offsets.

11. The method according to claim 1, further comprising the step of:

determining a given offset value for the radio link of the user entity accordance with the estimated time budget map;

wherein the determining step is performed upon at least one of a user entity is seeking connection with a base station and by a reconfiguring action.

12. The method according to claim 1, wherein the timing offset is a chip offset.

13. The method according to claim 1, wherein the determining of a given timing offset value for the radio link of the user entity in accordance with the estimated time budget map is performed upon a user entity seeking connection with the base station.

14. The method according to claim 1, wherein communication between the base station and user entity is based on a common timing scheme between the base station and at least the user entity, the timing offset value defining in relation to a time reference when the user entity can transmit on the uplink radio link, the timing offset value being defined for each user entity from the plurality of user entities.

15. The method according to claim 1, wherein the timing offset provides a time reference when a user entity is permitted to transmit on an uplink radio link.

16. The method according to claim 1, wherein the assignment of the timing offset value is optimized such that a base station processing time is above a minimum supported base station processing time.

17. A radio network control apparatus being adapted for adjusting a timing offset value for a radio link of a base station, the base station being adapted to receive uplink transmissions from a plurality of user entities, on the radio link according to predetermined response time requirements, the radio network control apparatus comprising:

a memory;

a processor coupled to the memory; and

a transmit bit map unit implemented by the processor executing instructions stored in the memory to;

estimate at least one base station time budget map according to which the available processing time in the base station is given as a function of the possible timing offset value;

determine a given offset value for the uplink radio link of a user entity from a plurality of user entities in accordance with the estimated time budget map; and

assign the determined timing offset value to the radio link,

wherein the assignment of the timing offset value is optimized such that a base station processing time is above a minimum supported base station processing time, and wherein the timing offset for each new user entity is further arranged such that a substantially even distribution over time is accomplished considering previously assigned user entities in a cell associated with the base station.

18. The radio network apparatus according to claim 17, further comprising a radio bearer control unit adapted to perform Node B application protocol signalling with a Node B.

19. The radio network apparatus according to claim 17, the timing bit map unit further configured to:

upon the user entity seeking connection with the base station, initiate radio link set-up for the user entity;

assign the determined timing offset value to the radio link; and

complete radio link set-up for the user entity.

20. The radio network apparatus according to claim 17, wherein the base station corresponds to Node B and the uplink corresponds to an Enhanced Up Link, and wherein the timing offset value is a chip offset associated with timing requirements for the Enhanced Dedicated channel at Node B.

21. The radio network apparatus according to claim 17, wherein the determination of a given offset value for the radio link of the user entity in accordance with the estimated time budget map, is made

upon a user entity seeking connection with the base station.