OPTIMIZED DELAY

• US 20120275382A1
• Filed: 12/15/2010
• Published: 11/01/2012
• 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
• Granted Patent: US 9,107,156 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• 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 (CO) for a receiver (Node-B), the receiver being adapted to controlling and receiving reverse radio link 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 (IBM—

116, 116′

) according to which the available processing time in the receiver is given as a function of the possible timing offset value (CO);

determining (15) a given timing offset value (CO—

106) for the radio link (RL) of the transmitter in accordance with the estimated time budget map (IBM), 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.

2. A method according to claim 1, wherein the receiver is a base station, the tranmitter is a user entity and the reverse link is the up-link from the user entity (UE).

3. Method according to claim 2, wherein a number of recurrent peaks (125) and their associated timing offset values are estimated in the time budget map (IBM).

4. Method according to claim 2 or 3, moreover comprising the step of optimizing the offset value (CO) involves comparing the time budget map (IBM) with a minimum supported base station processing time (112) for the base station, and wherein

the assignment (15) of the timing offset value is optimized such that base station processing time is above the minimum supported base station processing time (112).

5. Method according to any of claims 2-4, wherein the time budget map (TBM) constitutes a generalized map which pertains to a predetermined location, or a set of locations, in a cell associated with the base station.

6. Method according to any of claims 2-4, wherein a plurality of time budget maps (116, 116′

) 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.

7. Method according to any of claims claims 2-6, wherein a radio network control node (RNC) is interacting with the radio base station and wherein the timing offset value is controlled by the radio network control node (RNC).

8. Method according to any of claims claims 2-7, wherein the assignment of the timing offset value is performed such that base station processing time is chosen such as to be arranged not further away that a first given distance (d) from a given upper limit (UL) corresponding to the peaks of the time budget map (TBM) of the radio link, so as to accommodate for a possible timing drift.

9. Method according to any of claims claims 1-8, wherein an initial timing offset allocation (123) is chosen substantially centred between a position in the time budget map where a peak (125) is found and a position where a minimum supported processing time (121) is found.

10. Method according to any of claims 1-9, wherein the timing offset for each new user entity is further arranged such that a substantially even distribution over time is accomplished having regard to previously assigned user entities in a cell associated with the base station.

11. Method according to claim 10, where timing offsets of the radio links are skewed in time with different starting points in relation to one another.

12. Method according to any of claim 2-11, wherein a new offset value may be reassigned (17)—

after a delay (21) adapting for a changed location of a user entity or for obtaining a different distribution of offsets.

13. Method according to any of claims 2-11 further comprising the step of

determining (15) a given offset value (CO—

106) for the radio link (RL) of the user entity in accordance with the estimated time budget map (TBM), such as to provide an optimized offset (CO) value for the base station;

is performed upon a user entity is seeking connection with a base station (13), alternatively by a reconfiguring action (13A).

14. Method according to any previous claim, wherein, the timing offset is a chip offset.

15. Method according to any previous claim, wherein wherein the—

determining (5) of a given timing offset value (CO—

106) for the radio link (RL) of the user entity in accordance with the estimated time budget map (TBM), is perfomed upon a user entity is seeking connection with the base station.

16. Radio network control apparatus being adapted for adjusting a timing offset value (CO) for a radio link of a base station (Node-B), the base station being adapted to receive uplink transmissions from a user entity (UE) on the radio link according to predetermined response time requirements,

the radio network control apparatus (RNC) comprising a transmit bit map unit (TBM_U) being adapted for

estimating (11) at least one base station time budget map (TBM—

116, 116′

) according to which the available processing time in the base station is given as a function of the possible timing offset value (CO);

determining (15) a given offset value (CO—

106) for the radio link (RL) of the user entity 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.

17. Radio network apparatus according to claim 16, moreover comprising a radio bearer control unit adapted to perform Node B application protocol signalling with a Node B.

18. Radio network apparatus according to claim 16-17, the timing bit map unit (TBM_U) moreover being adapted for

upon a user entity (UE) seeking connection with the base station, moreover initiating (13) radio link (RL) set-up for the user entity (UE);

subsequently to assigning (17) the determined timing offset value (CO) to the radio link,

completing (18) radio link set-up for the user entity (UE).

19. Radio network apparatus according to any of claims 16-18, wherein the base station corresponds to Node B and the uplink regards the 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.

20. Radio network apparatus according to any of claims 16-19, wherein the step of—

determining (15) a given offset value (CO—

106) for the radio link (RL) of the user entity in accordance with the estimated time budget map (TBM), is made—

upon a user entity (UE) seeking connection with the base station.