CN101052205A - User's terminal switch control method in mobile communication system - Google Patents
User's terminal switch control method in mobile communication system Download PDFInfo
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- CN101052205A CN101052205A CNA2006100670884A CN200610067088A CN101052205A CN 101052205 A CN101052205 A CN 101052205A CN A2006100670884 A CNA2006100670884 A CN A2006100670884A CN 200610067088 A CN200610067088 A CN 200610067088A CN 101052205 A CN101052205 A CN 101052205A
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Abstract
The invention is invention is used for solving the problem of occupying resources when a terminal is switch from a macro-cell to a micro-cell. The method comprises: dividing all micro cells belonging to one macro-cell into several logical cells; all micro cells on one logical cell have same frequency carrier and downlink scrambling code; when making a switch, the logical cells are used as the target cells to select a logical cell with best signal quality; selecting a micro-cell with best signal quality; using the selected micro-cell as the serving cell of the user's terminal.
Description
Technical field
The present invention relates to user's terminal switch control method in a kind of cell mobile communication systems, especially have user's terminal switch control method in the mobile communication system of macrocellular and micro-honeycomb structure.
Background technology
In the honeycomb mobile communcations system, because subscriber equipment (user terminal) is mobile, user terminal can move to the overlay area of another one cellular cell from the overlay area of a cellular cell.In order to guarantee the continuity of user terminal conversation, the wireless connections of user terminal and base station need be switched to new cellular cell from original cellular cell, the handoff procedure in the mobile communication system that Here it is.The general process that switches is as shown in Figure 1: network sends measurement control order to user terminal, the parameter of the Target cell that informing user terminal need be measured; User terminal is measured the wireless quality of a plurality of Target cells, and gives network with measurement report; Network based measurement result selects a top-quality sub-district as switching target small area from a plurality of Target cells, prepares Radio Resource for user terminal, sends switching command to user terminal then, the wireless parameter configuration of informing user terminal Target cell; After user terminal was received switching command, according to the parameter configuration foundation of Target cell and the wireless connections of Target cell, the success back sent handoff completion message to network, finishes handoff procedure, continues original conversation inside new sub-district.
At the networking initial stage of mobile communications network, because number of users is fewer, generally adopt the network configuration of macrocellular (Macro Cell) to cover, the covering radius of macro cells is generally at 1 kilometer to tens kilometers.Along with the increase of network user's number, the capacity of macrocellular can not satisfy traffic needs.In order to remedy the off-capacity of macrocellular, generally adopt microcellulor (Micro-Cell) or Pico cell (Pico-Cell) to cover at hot zones, this has just formed the network coverage structure of multilayer.In addition, in order to improve indoor covering quality, general indoor covering also adopts microcellulor or Pico cell to cover.The network configuration that multilayer covers as shown in Figure 2.In the area that has microcellulor to cover, user terminal inserts from microcellulor; In the area that does not have microcellulor to cover, user terminal inserts from macrocellular.User terminal can switch between microcellulor when mobile, also can switch between microcellulor and macrocellular.As shown in Figure 1, as broad as long at the switching between the microcellulor and microcellulor to switching between the macrocellular and general handoff procedure.But from the switching of macrocellular to microcellulor, need dispose a lot of adjacent areas for user terminal, in theory, all microcellulors under the macrocellular overlay area all are the adjacent areas of this macrocell, user terminal will be measured as the adjacent area all these microcellulors like this, reduce switching efficiency, improved power consumption; For fear of this problem, existing a lot of mobile communcations systems limit for the simultaneously-measured maximum adjacent area of user terminal number, with the WCDMA system is example, the adjacent area number that user terminal can be measured is 32 to the maximum, make that the switching from the macrocellular to the microcellulor is restricted in many covered structures, user terminal can occur and can't switch to the best microcellulor of signal.
Summary of the invention
At existing problem and shortage in the above-mentioned prior art, the objective of the invention is to propose in a kind of mobile communication system, can improve the handover success rate of system, and the switching efficiency height, save the user's terminal switch control method in the mobile communication system of user terminal power consumption.
The present invention proposes the user's terminal switch control method in a kind of mobile communication system to achieve these goals, may further comprise the steps:
(1) all the microcellulor microzonations under the same macrocellular covering is divided into two or more logic district, each microcellulor sub-district belongs to and only belongs to a logic district, and all interior microcellulor sub-districts of logic district have identical carrier frequency and pilot channel parameter, keep certain distance to satisfy anti-interference requirement between the microcellulor in the same logic district;
(2) when user terminal after macro cells makes a call, network side sends measurement control order to user terminal, all logic district under notice covers described macro cells are carried out handover measurement as the abutting subdistrict of user terminal, comprise the pilot channel parameter of each logic district in the described measurement control messages;
(3) user terminal is measured according to described pilot channel parameter, and measurement result is sent to network side;
(4) network side selects the best logic district of pilot frequency channel signal as switching target small area according to described measurement result, and all microcellulors send the identical Radio Link request message of setting up in this logic district;
(5) network side sends switching command to user terminal, and the order user terminal switches to described switching target small area, comprises the parameter of new Radio Link in the described switching command;
(6) user terminal is received switching command, according to the best microcellulor sub-district in the described switching command selection switching target small area, set up the up-link wireless link and carry out synchronously according to the parameter configuration of Radio Link and described best microcellulor sub-district, the success back sends handoff completion message to network side on new Radio Link;
(7) network side obtains the various configuration informations of actual switching target small area, with the Serving cell of described microcellulor sub-district as user terminal according to the base station physical address of the microcellulor sub-district that receives handoff completion message;
Wherein, described method also comprises:
(8) network side is ignored from the wireless link synchronization failed message of other base station and is notified other base stations to discharge the respective wireless link.
Wherein, described pilot channel parameter comprises carrier frequency parameter and descending scrambler configuration information.
Wherein, the middle switching command of described step (5) also comprises the carrier frequency and the descending scrambler configuration information of described switching target small area.
The present invention proposes the date storage method that a kind of multicenter voice is handled.User terminal is when macrocellular enters microcellulor in the prior art, and user terminal causes reducing switching efficiency, improves power consumption as the adjacent area measurement; Some system is in order to prevent the problems referred to above, and the maximum that defines user terminal is measured the adjacent cells number, causes occurring user terminal and can't switch to the best microcellulor of signal.The present invention adopts all microcellulors that same macrocellular is covered to divide several logic district into, all microcellulors of each logic district have identical carrier frequency and pilot channel parameter, user terminal is when macrocellular switches to microcellulor like this, only need to measure with each logic district, and from the best logic district of signal quality, select an optimum cellular sub-district as Serving cell, so promptly can not cause user terminal measurement efficient to reduce, waste user terminal power, simultaneously can from all cellular cells, select the optimum cellular sub-district again, improve efficient and the success rate for switching switched.
Description of drawings
Fig. 1 is the flow chart of user's switching cell in the existing cell mobile communication systems;
Fig. 2 is a multilayer covered structure schematic diagram;
Fig. 3 is the preferred embodiments of the present invention flow chart;
Fig. 4 is that logic district is divided schematic diagram in the WCDMA system multilayer sub-district;
Fig. 5 is applied in WCDMA system switching flow for the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 2, the multilayer covered structure is meant and includes a plurality of microcellulors in macrocellular.The present invention is directed to this structure and propose.Preferred embodiment of the present invention flow process comprises as shown in Figure 3:
(1) all the microcellulor microzonations under the same macrocellular covering is divided into two or more logic district, each microcellulor sub-district belongs to and only belongs to a logic district, and all interior microcellulor sub-districts of logic district have identical carrier frequency and pilot channel parameter, keep certain distance to satisfy interference requirement between the microcell base station in the same logic district;
(2) when user terminal after macro cells makes a call, network side sends measurement control order to user terminal, all logic district under notice covers described macro cells are carried out handover measurement as the abutting subdistrict of user terminal, comprise the carrier frequency parameter and the descending scrambler configuration information of each logic district in the described measurement control messages;
(3) user terminal is measured according to described carrier frequency parameter and descending scrambler configuration information, and measurement result is sent to network side;
(4) network side selects the best logic district of pilot frequency channel signal as switching target small area according to described measurement result, and all microcellulors send the identical Radio Link request message of setting up in this logic district;
(5) network side sends switching command to user terminal, and the order user terminal switches to described switching target small area, comprises parameter, carrier frequency parameter and the descending scrambler configuration information of new Radio Link in the described switching command;
(6) user terminal is received switching command, according to the best microcellulor sub-district in the selection of the parameter in the described switching command switching target small area, set up the up-link wireless link and carry out synchronously according to the parameter configuration of Radio Link and described best microcellulor sub-district, the success back sends handoff completion message to network side on new Radio Link;
(7) network side obtains the various configuration informations of actual switching target small area, with the Serving cell of described microcellulor sub-district as user terminal according to the base station physical address of the microcellulor sub-district that receives handoff completion message;
(8) network side is ignored from the wireless link synchronization failed message of other base station and is notified other base stations to discharge the respective wireless link.
Be example with the WCDMA system below, the present invention will be further described.
As shown in Figure 5, in the WCDMA system, flow process of the present invention is:
(A) in the area that needs microcellulor to cover, as shown in Figure 4, all microcellulor microzonations that belong to same carrier frequency under the macro cells covering are divided into several logic district, a logic district comprises a plurality of microcellulors sub-district, a microcellulor sub-district belongs to and only belongs to a logic district, macro cells and microcellulor sub-district are actual sub-districts, logic district is a kind of grouping to the microcellulor sub-district, and what represent among Fig. 4 is that the identical microcellulor microzonation of numbering is divided into one group as a logic district.Macro cells is used different carrier frequency with the microcellulor sub-district, all microcellulors in the same logic district use identical carrier frequency and descending scrambler, and guarantee that these microcellulor sub-districts with same carrier and descending scrambler spatially keep enough isolation distances so that the descending interference between these sub-districts can be ignored.All macro cells and microcellulor sub-district belong to same RNC administration, preserve mapping relations table between each microcellulor sub-district and the logic district under it at RNC.
(B) UE makes a call in macro cells, after call setup is finished, RNC sends measurement control order to UE and starts handover measurement, in the measurement control order, the target abutting subdistrict that configuration UE need be measured is measured the carrier frequency and the descending scrambler configuration information that comprise each logic district in the control messages for all logic district under this macro cells covering.
(C) after UE receives measurement control order, frequency and descending scrambler according to the logic district that disposes in the message carry out Cell searching and measurement, and measurement result sent RNC by measurement report message, comprise the measurement results such as signal strength signal intensity, signal interference ratio of the pilot channel of different microcellulors sub-district in the message with described carrier frequency and scrambler configuration.
(D) measurement result that reports according to UE of RNC, therefrom select a top-quality logic district, by finding step 2 described logic district and microcellulor cell relations mapping table, obtain all microcellulor sub-districts that this logic district comprises, send Radio Link to the Node B at all places, microcellulor sub-district that this logic district comprises then and set up order, require these Node B to set up Radio Link in above-mentioned microcellulor sub-district; The Radio Link that RNC sends to all Node B is set up message and is had identical content.After Node B under each microcellulor sub-district receives that Radio Link is set up message, set up Radio Link in each microcellulor sub-district, send Radio Link foundation to RNC after finishing and finish message according to the parameter of RNC configuration.
(E) RNC receive described finish message after, send the order of physical channel reprovision to UE, comprise the carrier frequency and the descending scrambler configuration information of selected logic district in the message.
(F) after UE receives the physical channel reallocation message, set up Radio Link according to the parameter configuration in the message in top-quality microcellulor sub-district, success back sends the physical channel reprovision to RNC and finishes message on the newly-built Radio Link of Target cell;
(G) after RNC received this message, which microcellulor sub-district what can obtain receiving this message according to the physical address of the Node B that receives this message was, and with the Serving cell of this microcellulor sub-district as UE.
(H) other Node B does not receive the upstream data of UE, and the wireless link synchronization failure sends the wireless link synchronization failed message to RNC.RNC these Node B that receive orders discharge corresponding Radio Link.
Technique scheme is that the handoff procedure with the WCDMA system is that example is described.But method for handover control of the present invention is not limited to the WCDMA system, but is applicable to the mobile cellular communication system that any employing macrocellular and microcellulor cover.For example for gsm system, in above-mentioned steps (A), be the identical carrier frequency of the broadcast channel assigned of each microcellulor sub-district, then such scheme is equally applicable to gsm system.
Claims (4)
1, the user's terminal switch control method in a kind of mobile communication system may further comprise the steps:
(1) all the microcellulor microzonations under the same macrocellular covering is divided into two or more logic district, each microcellulor sub-district belongs to and only belongs to a logic district, and all interior microcellulor sub-districts of logic district have identical carrier frequency and pilot channel parameter;
(2) when user terminal after macro cells makes a call, network side sends measurement control order to user terminal, all logic district under notice covers described macro cells are carried out handover measurement as the abutting subdistrict of user terminal, comprise the pilot channel parameter of each logic district in the described measurement control messages;
(3) user terminal is measured according to described pilot channel parameter, and measurement result is sent to network side;
(4) network side selects the best logic district of pilot frequency channel signal as switching target small area according to described measurement result, and all microcellulors send the identical Radio Link request message of setting up in this logic district;
(5) network side sends switching command to user terminal, and the order user terminal switches to described switching target small area, comprises the parameter of new Radio Link in the described switching command;
(6) user terminal is received switching command, according to the best microcellulor sub-district in the described switching command selection switching target small area, set up the up-link wireless link and carry out synchronously according to the parameter configuration of Radio Link and described best microcellulor sub-district, the success back sends handoff completion message to network side on new Radio Link;
(7) network side obtains the various configuration informations of actual switching target small area, with the Serving cell of described microcellulor sub-district as user terminal according to the base station physical address of the microcellulor sub-district that receives handoff completion message;
2, the user's terminal switch control method in the mobile communication system according to claim 1 is characterized in that, also comprises:
(8) network side is ignored from the wireless link synchronization failed message of other base station and is notified other base stations to discharge the respective wireless link.
According to the user's terminal switch control method in the mobile communication system of claim 1 or 2, it is characterized in that 3, described pilot channel parameter comprises carrier frequency parameter and descending scrambler configuration information.
4, the user's terminal switch control method in the mobile communication system according to claim 3 is characterized in that, switching command also comprises the carrier frequency and the descending scrambler configuration information of described switching target small area in the described step (5).
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