CN101142781A - Method and system for allocating time slots for a common control channel - Google Patents
Method and system for allocating time slots for a common control channel Download PDFInfo
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- CN101142781A CN101142781A CNA2005800084909A CN200580008490A CN101142781A CN 101142781 A CN101142781 A CN 101142781A CN A2005800084909 A CNA2005800084909 A CN A2005800084909A CN 200580008490 A CN200580008490 A CN 200580008490A CN 101142781 A CN101142781 A CN 101142781A
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Abstract
A method and system for allocating a time slot to each of the base stations for a communication channel to each of a plurality of base stations in a wireless communication system is disclosed. In a wireless communication system, a coverage area of the system is divided into a plurality of cells and each cell is served by a base station. The system receives a list of base stations which need to be configured along with a list of time slots available to transmit the communication channel. A time slot for the communication channel is allocated to each of the base stations in the list based on interference measured at each of the base stations in the list.
Description
Technical field
The present invention relates to a kind of wireless communication system.More particularly, the present invention relates to a kind of time slot method and system that is used in Common Control Channel that in wireless communication system, divide.
Background technology
Cellular system uses Common Control Channel that control information is sent to wireless transmitter/receiver unit (WTRU) in sub-district or cell set usually.In time division duplex (TDD) system, two kinds of Common Control Physical Channels (CCPCH) are arranged: the elementary Common Control Physical Channel (PCCPCH) of supporting broadcast channel (BCH); With the secondary Common Control Physical Channel (SCCPCH) of supporting forward access channel (FACH) and paging channel (PCH).PCCPCH is supported by different time slots usually with SCCPCH.The time slot that is used for the transmission of PCCPCH or SCCPCH can be similar and different between a sub-district and another sub-district.
When two sub-districts that belong to same subsystem use identical time slot to transmit CCPCH, the influence of the interference that the CCPCH that the WTRU reception of the CCPCH in sub-district can be subjected to transmitting another sub-district to a certain extent produces.Term " subsystem " be meant since relatively near and the TDD cell set that can interfere with each other.If this cochannel interference level is too high, then can produce serious mis-behave to the WTRU that this sub-district is served.For example, receive by bad PCCPCH that the influence that causes comprises delay to user's accesss of wireless access network (RAN), service holes and such as switching and the deterioration of the crucial radio resource management function that power is controlled.Similarly, when this SCCPCH was used to launch user data, the bad performance on the SCCPCH can cause unacceptable delay and throughput reduction in the call set-up time.
For fear of this deterioration, system operator can adopt identical time slot to avoid having abutting subdistrict by the CCPCH to them.If sub-district A and sub-district B are two abutting subdistricts, the time slot that is used for CCPCH so among the A of sub-district does not use at sub-district B usually, and perhaps, this time slot may be used to have the transmission of the dedicated channel (DCH) of certain limitation, for example limits the through-put power on this time slot.
In order to ensure having minimum interval between two sub-districts of CCPCH being adopted identical time slot, can use the fixing pattern (FRP) of using again.In FRP, time slot distributes according to the mode of rule based on base station location.Regular lattice is laid and propagation conditions is even relatively in the laying zone as long as the base station can be gone up according to how much, then can adopt the FRP technology relatively simply.Although be not to all scenario, this can be considered to be at the situation in certain traditional macrocellular laying.
Regrettably, there is the situation that much can not satisfy above-mentioned condition.For example, in macrocellular and indoor laying, the non-systematicness of certain geographical feature may produce the laying of carrying out the base station according to regular lattice together with station for acquiring (site acquisition) problem and hinder.In these identical environment, propagation conditions needn't be even.Under the situation in other macrocellular environment of street-level, the propagation conditions between two sub-districts on the propagation conditions between two sub-districts on the identical street and the orthogonal street is different fully.In addition, even station for acquiring problem and non-homogeneous propagation conditions occur, but because business is highly heterogeneous in these environment, so from capacity angle, perfect how much lattices of utilization lay macrocell and superminiature honeycomb (pico-cell) is undesirable.
In these cases, the FRP technology can not simply adopt, and operator must rely on repetition test (trial and error) to distribute suitable time slot for CCPCH.If such repetition test method was carried out before the commerce services operation, so this method will need detailed in-site measurement.Selectively, if such repetition test method go up to be carried out at activity network (live network), it may cause the low quality discovered by the user so, till finding suitable setting.
In another kind was selected, operator can use wireless frequency path loss forecasting tool before the repetition test method, but this also needs detailed in-site measurement and calibration.Thereby this method cost height, efficient are low.
Summary of the invention
The present invention discloses a kind of time slot method and system that is used for communication channel for each base station assigns.In wireless communication system, the overlay area of system is divided into a plurality of sub-districts, and each sub-district is served by the base station.This system is used for for example time slot of CCPCH of communication channel according to the interference of each base station measurement in tabulation for each base station assigns in this tabulation,
Description of drawings
Fig. 1 is according to wireless communication system of the present invention;
Fig. 2 is the flow chart according to the method for the automatic time-slot-cell allocation that is used for communication channel of the present invention.
Embodiment
Present invention is described below with reference to the accompanying drawings, the wherein identical identical element of label representative.
Hereinafter, term " WTRU " is including, but not limited to the device that can work in wireless environment of subscriber equipment, mobile radio station, fixing or moving user unit, beep-pager or any other type.
Hereinafter, the interface jockey of term " base station " in the wireless environment of Node B (Node-B), site controller, access point or any other type.Equally, term " CCPCH time slot " is used for any time slot that expression is used to transmit this CCPCH (PCCPCH or SCCPCH).
The present invention is automatically a kind of and adaptively each base station maps in the wireless communication system is arrived the system and method for suitable CCPCH time slot.Method of the present invention can realize in as the radio network controller (RNC) of the Premium Features of RRM (RRM) function, perhaps independently realize in software plan (software-planning) instrument.The present invention can realize to give PCCPCH or SCCPCH time slot with allocation of radio resources.For simplicity, the present invention is described main reference PCCPCH.Yet, it will be appreciated that the present invention can be used for for example self-configuring of SCCPCH time slot (self-configuration) of any other CCPCH time slot.The present invention also can be widely used in the other types time slot in the communication channel of any other type.
Fig. 1 has shown according to wireless communication system 100 of the present invention.This system 100 comprises a plurality of base station 104a-c and radio network controller (RNC) 106.The overlay area of system 100 is divided into a plurality of sub-district 108a-c, and each sub-district 108a-c is served by the base station 104a-c that separates respectively.Base station 104a-c is via PCCPCH emission system parameter, this system parameters for activate WTRU for example WTRU 102 to communicate with base station 104a-c be essential.The tabulation that allows to distribute to the time slot of CCPCH offers this RNC 106.
When CCPCH distributes time slot, RNC 106 has to the access of the tabulation of base station 104a-c.This RNC 106 is with the distribution of (time slot-to-cell) to the sub-district of the CPCCH time slot of carrying out each base station 104a-c in the base station 104a-c tabulation with iterative manner in turn.Described time slot to the distribution of sub-district is measured based on interference, thereby the interference level of perceiving at each base station 104a-c is minimized.
Fig. 2 is according to the flow chart that distributes time slot method 200 in the wireless communication system of the present invention.The example of Cai Yonging will be CCPCH hereinafter.Yet this only is not to be restriction for example.Those skilled in the art it will be appreciated that the channel of other types also can be realized the present invention.In initial condition, the base station in the subsystem is laid and prepared to be activated.The neither one cell allocation has the PCCPCH time slot.Under this state, all base stations in the subsystem are identified, and the station list that need be configured is provided (step 202) with can be used for launching the maximum iteration time of CCPCH and the execution of method 200 needs as input.
Under the situation that this system moves first, station list can comprise all sub-districts in this system.In other cases, station list can comprise the new base station that has been laid in the existing wireless network, and perhaps, this station list can comprise the subset of cells of system, and wherein the subset of cells for this system needs the optimization of CCPCH time slot to the distribution of sub-district.Under the preferable case, station list was provided as input to cell allocation at the triggering automatic time-slot by wireless system operator.
Then, method 200 is given each base station of tabulation according to the time slot allocation that the interference at each base station measurement will be used for CCPCH, and this will be described hereinafter.Preferred CCPCH time slot to the mapping of base station is: this mapping meets the lowest interference in the CCPCH time slot of perceiving each base station.
First base station selected (step 208) in the station list and this first base station are triggered to measure and to report the interference of perceiving on each the CCPCH time slot in being included in available CCPCH time slot tabulation of this first base station (step 210).It should be noted that the base station does not require in station list with any particular order ranking.Yet ranking can be carried out according to date or any other standard that lay geographical coordinate, base station in described base station.
First base station assigns has the interference of measurement to be minimum CPCCH time slot, and this base station begins the transmission (step 212) of this CCPCH on the time slot of this selection.Have at a plurality of CCPCH time slots under the situation of same disturbance measurement, first time slot in the CCPCH time slot tabulation that is allowed is selected.
Then, determine in this tabulation, whether to remain any other base station (step 214).If do not remain other base stations in this tabulation, then method 200 is returned step 204.If the residue base station is arranged, then method 200 is selected next base station (step 216) in these station lists, and proceeds to step 210.
By allowing wireless communication system that self-configuring is carried out in its PCCPCH time slot to the distribution of base station, from planning in advance and be to free the burden of PCCPCH distributing radio resource, this burden comprises when cloth if in-site measurement action widely and use complicated interference prediction instrument during capacity-enlarging system with operator in the present invention.
Though feature of the present invention and element are described with specific combination in preferred embodiment, but each feature or element can be under the situation of other features that do not have described preferred implementation and element use separately, or with or with under the various situations that other features of the present invention and element combine do not use.
Claims (16)
1. time slot method that in wireless communication system, is used for dynamically being used for Common Control Physical Channel (CCPCH) to each base station assigns, the overlay area of described wireless communication system is divided into a plurality of sub-districts and each sub-district is served by the base station, and this method comprises:
(a) the time slot tabulation that receives the station list that is configured as the needs of importing and can be used for launching described CCPCH; With
(b) according to the interference of each base station measurement in tabulation, each base station assigns in this tabulation of trend is used for the time slot of CCPCH.
2. method according to claim 1 is characterized in that step (b) comprising:
(c) from described station list, select a base station;
(d) make selected base station measurement and report to the base station of this selection can with each time slot in the interference perceived;
(e) has the time slot of lowest interference to selected base station assigns; With
(f) to the residue base station repeating step (c)-(e) in the described station list.
3. method according to claim 1 is characterized in that described CCPCH is elementary CCPCH.
4. method according to claim 1 is characterized in that described CCPCH is secondary CCPCH.
5. method according to claim 1 is characterized in that ranking is carried out according to the geographical coordinate of described base station in the base station in the described station list.
6. method according to claim 1 is characterized in that ranking is carried out according to the date of base station laying in the base station in the described station list.
7. radio network controller (RNC) that is used for being used for to base station assigns the time slot of Common Control Physical Channel (CCPCH) at wireless communication system, the overlay area of described wireless communication system is divided into a plurality of sub-districts, each sub-district is served by the base station, and this RNC comprises:
Be used to receive the station list that is configured as the needs of importing and can be used for launching the device of the time slot tabulation of described CCPCH; With
Be used for according to the interference at each base station measurement of tabulation, each base station assigns in this tabulation of trend is used for the device of the time slot of CCPCH.
8. RNC according to claim 7 is characterized in that described distributor comprises:
Be used for selecting the device of a base station from described station list;
Be used to each base station in the time slot that allows, to select the device of a time slot;
Be used to ask base station measurement and be reported in the device of the interference that each time slot that each base station allows perceives; With
Be used for to have the device of the time slot allocation of lowest interference to each base station.
9. RNC according to claim 7 is characterized in that described CCPCH is elementary CCPCH.
10. RNC according to claim 7 is characterized in that described CCPCH is secondary CCPCH.
11. RNC according to claim 7 is characterized in that ranking is carried out according to the geographical coordinate of described base station in the base station in the described station list.
12. RNC according to claim 7 is characterized in that ranking is carried out according to the date of base station laying in the base station in the described station list.
13. a method that is used for the time slot dynamic assignment of communication channel is given each base station in having the wireless communication system of being served by the base station in a plurality of sub-districts and each sub-district, this method comprises:
(a) receive the station list that need be configured;
(b) receive the time slot tabulation that can be used for launching described communication channel; With
(c) according to the interference of each base station measurement in described tabulation, will be used for the time slot allocation of communication channel each base station automatically to this tabulation.
14. method according to claim 13 is characterized in that step (c) comprising:
(d) from station list, select a base station;
(e) make selected base station measurement and report to the base station of this selection can with each time slot in the interference perceived;
(f) has the time slot of lowest interference to selected base station assigns; With
(g) to the residue base station repeating step (c)-(e) in the described station list.
15. method according to claim 13 is characterized in that ranking is carried out according to the geographical coordinate of described base station in the base station in the described station list.
16. method according to claim 13 is characterized in that ranking is carried out according to the date of base station laying in the base station in the described station list.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US55352004P | 2004-03-16 | 2004-03-16 | |
| US60/553,520 | 2004-03-16 | ||
| US11/016,027 | 2004-12-17 |
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| CN101142781A true CN101142781A (en) | 2008-03-12 |
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| CNA2005800084909A Pending CN101142781A (en) | 2004-03-16 | 2005-03-03 | Method and system for allocating time slots for a common control channel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662775B (en) * | 2008-08-27 | 2013-08-28 | 上海华为技术有限公司 | Method, device and system for reducing base station interference |
| US9258799B2 (en) | 2010-11-26 | 2016-02-09 | Lg Electronics Inc. | Method for reporting channel information based on link adaptation in wireless local area network and the apparatus for the same |
-
2005
- 2005-03-03 CN CNA2005800084909A patent/CN101142781A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662775B (en) * | 2008-08-27 | 2013-08-28 | 上海华为技术有限公司 | Method, device and system for reducing base station interference |
| US9258799B2 (en) | 2010-11-26 | 2016-02-09 | Lg Electronics Inc. | Method for reporting channel information based on link adaptation in wireless local area network and the apparatus for the same |
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Open date: 20080312 |