Method of operating searcher in a mobile communication system

• US 20030125060A1
• Filed: 12/30/2002
• Published: 07/03/2003
• Est. Priority Date: 12/29/2001
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jong Heon, Oh, In Jeong
• Granted Patent: US 7,072,677 B2
• Time in Patent Office: Days
• US Class Current: 455/509
• CPC Class Codes: H04B 1/70758 Multimode search, i.e. using multiple search strategies
• CPC Class Codes: H04B 1/7117 Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception

Abstract

Disclosed is a method of operating searchers, and setting a search information list and searching channels for the same. In a communication system, a method of searching channels, comprises the steps of generating a queue of priorities for each search mode, allocating to searchers search items having higher priorities based on the queue, and searching the search items by the allocated searchers.

Claims

1. A method of operating a searcher in a mobile communication system, comprising:

generating a queue of priorities for each search mode;

allocating to searchers searching items having higher priorities based on the queue; and

searching the searching items by the allocated searchers.

2. The method of claim 1, wherein the search mode is at least one of an access preamble search mode, a traffic preamble search mode, and a traffic multi-path search mode.

3. The method of claim 2, wherein the search modes have different priorities and search items of a queue of a search mode having a higher priority are first searched.

4. The method of claim 3, wherein a priority is greater in an order of the access preamble search mode, the traffic preamble search mode, and the traffic multi-path search mode.

5. The method of claim 3, wherein search information lists of the search modes commonly have a channel type, a search mode, a number of search sectors, a search sector list, a current search sector index, and a current search window.

6. The method of claim 3, wherein a search information list of the access preamble search mode further includes an access preamble size, an access slot size, an access frame index, and access search-done time.

7. The method of claim 5, wherein a search information list of the traffic preamble search mode further includes a frame offset, and information on a first power control group and a second power control group.

8. The method of claim 1, wherein the search mode is at least one of an enhanced access preamble search mode, a traffic preamble search mode, and a traffic multi-path search mode.

9. The method of claim 8, wherein the search modes have different priorities and search items of a queue of a search mode having a higher priority are first searched.

10. The method of claim 9, wherein a priority is greater in an order of the enhanced access preamble search mode, the traffic preamble search mode, and the traffic multi-path search mode.

11. The method of claim 8, wherein search information lists of the search modes commonly have a channel type, a search mode, a number of search sectors, a search sector list, a current search sector index, and a current search window.

12. The method of claim 11, wherein a search information list of the enhanced access preamble search mode further includes an on/off length of an enhanced access channel preamble, a number of repetition of the on/off, a slot size of the enhanced access channel, an offset of a slot boundary of the enhanced access channel within a slot duration, a slot offset number, and a time of a last completed search.

13. The method of claim 11, wherein a search information list of the traffic preamble search mode further includes a frame offset.

14. An apparatus of operating a searcher in a mobile communication system, comprising:

a first controller for generating a queue of priorities for each search mode and allocating to searchers search items having higher priorities based on the queue;

a timer for being aligned with a system reference time and generating a current time information;

a second controller for generating an interrupt to the first controller based on the time information and controlling the first controller such that the first controller may clear the generated interrupt; and

searchers for searching offsets of the allocated search items.

15. The apparatus of claim 14, wherein the second controller generates at least one of a time tick interrupt and an offset time tick interrupt.

16. The apparatus of claim 15, wherein the apparatus performs a routine of a search resource management based on the time tick interrupt.

17. The apparatus of claim 15, wherein the apparatus performs a search-done routine based on the offset tick interrupt.

18. The apparatus of claim 14, further comprising:

a first buffer for storing search parameters of the searchers; and

a second buffer for storing search results of the searchers.

19. A method of operating a searcher in a mobile communication system for generating a queue of priorities for each search mode and first allocating to searchers search items having higher priorities based on the queue, comprising:

(a) setting a type and a search mode according to established channel;

(b) setting a search sector index, an antenna, a search start offset, a search window size on a search sector list and increasing a number of sectors;

(c) registering at least one channel on the queue as the search items;

(d) removing search items of a released and/or search-done channel from search items of the queue; and

(e) flushing a search sector list of the released and/or search-done channel and setting the number of sector as ‘

0’

.

20. The method of claim 19, the (a) step further comprising:

(a1) further setting a frame offset in traffic channel search mode; and

(a2) further setting an access preamble size, an access slot size, and an access channel last search-done time as ‘

0’

.

21. A method of operating a searcher in a search mode change of a mobile communication system for generating a queue of priorities for each search mode and first allocating to searchers search items having higher priorities based on the queue, comprising:

(a) acquiring a preamble of a traffic channel; and

(b) changing a search mode of the search information list into a traffic multi-path search mode.

22. A method of operating a searcher in a handoff mode of a mobile communication system for generating a queue of priorities for each search mode and first allocating to searchers search items having higher priorities based on the queue, comprising:

(a) setting a search sector index, an antenna, a search start offset, a search window size on a search sector list of a sector added in the softer handoff mode and increasing a number of sectors; and

(b) setting a search sector index, an antenna, a search start offset, a search window size on a search sector list of a sector dropped in the softer handoff mode and decreasing a number of sectors;

23. A method of operating a searcher in a mobile communication system for generating a queue of priorities for each search mode and first allocating to searchers search items having higher priorities based on the queue, comprising:

(a) setting a number of channels of a first queue of a first search mode as a number of remaining channels;

(b) when a number of allocated searchers is less than that of all searchers, setting a first priority search item of the first queue as a current search item and checking whether the first priority search item is searched;

(c) when the first priority search item is searched, allocating a search to the first priority search item;

(d) searching the first priority search item until the first priority search item is nulled;

(e) repeating the (b), (c), and (d) steps until the number of allocated searchers is not less than that of all of the searchers; and

(f) when the number of remaining channels is equal to ‘

0’

, setting a second priority search item of a second queue as the current search item and searching the second priority search item.

24. The method of claim 23, further comprising the step of:

(g) when the search item of the second queue is nulled, setting a third priority search item of a third queue as the current search item and searching the third priority search item.

25. The method of claim 24, further comprising the step of:

searching the current search item set for turned-on search period where the third search mode supports a search-on/search-off for each search period.

26. The method of claim 23, wherein the first search mode is an access preamble search mode, the second search mode is traffic preamble search mode, and the third search mode is traffic multi-path search mode.

27. The method of claim 23, the (d) step further comprising the step of:

partial searching by search sector and/or search window of the search item.

28. The method of claim 27, further comprising the step of:

storing and updating the partial search result by search sector and/or by search window.

29. The method of claim 23, wherein the first search mode is an enhanced access preamble search mode, the second search mode is traffic preamble search mode, and the third search mode is traffic multi-path search mode.