CN101217792B - A measurement and control method in wireless cellular communication system - Google Patents

Abstract

The invention relates to a method of measurement and control in a wireless cellular communication system. In the process of measurement control and measurement report of adjacent cell which is initiated in a service cell, the service cell indicates whether a global cell ID corresponding to a bottom layer protocol ID used for identifying adjacent cell is a local uniqueness; after a terminal achieves the measurement of the adjacent cell, if the global cell ID corresponding to the bottom layer protocol ID of adjacent cells which are required to be reported is not the local uniqueness, and the adjacent cells are identified by the global cell ID in the measurement report. When a bottom layer protocol cell ID is corresponding to a plurality of global cell IDs, the invention ensures that the service cell can exactly identify corresponding adjacent cells in the measurement result of the terminal and ensures normal wireless resource management and operation.

Description

Measure the method for control in a kind of wireless cellular communication system

Technical field

The present invention relates to the radio honeycomb communication technical field, specifically, relate to the method for measuring control in the radio honeycomb communication system, this method can solve issuable adjacent cell ambiguity.

Background technology

In radio honeycomb communication system, all there is a unique global cell ID each sub-district, and terminal can be obtained this global cell ID by read system message.In addition, in measuring control messages and measurement report, often adopting the sub-district ID of the underlying protocol of adjacent cell to represent, in WCDMA (Wideband Code Division Multiple Access (WCDMA)) system, is that main scrambler by the sub-district adds frequency and represents; In LTE (the long-term technology evolution) system, be to distinguish by the physical district ID on the synchronizing channel of sub-district; GERAN (GSM-EDGE Radio Access Network, GSM-EDGE wireless access network) system adopts frequency to add BSIC (Base Station Identity Code, base station identity code) to represent.

With LTE is example, and it is such measuring control and measuring the process that reports: at first a neighbor cell list that allows measurement and switch can be set up in each sub-district, and Serving cell is known the PCI (physical district ID) and the GCI (global cell ID) of these adjacent cells.After terminal and Serving cell were set up wireless connections, Serving cell can send measured the control signaling, requires terminal to measure, and measured in the control signaling to comprise adjacent cell ID, adopted PCI to represent.Terminal begins to measure after receiving above-mentioned measurement control signaling, and the process of measurement comprises cell search process and actual measuring process at least.The main purpose of Cell searching is the down-going synchronous of knowing the PCI of adjacent cell and obtaining this sub-district, so that further measure.When terminal finish measured after, can be in measurement report adopt PCI represent certain adjacent cell, so that the measurement event of resulting measurement result or triggering and this adjacent cell are associated.Serving cell is mapped to a GCI according to PCI again when handling measurement report, just can do further processing at radio resource control layer, whether needs switching that is triggered to this adjacent cell or the like such as decision-making.Terminal can not read upper strata global cell ID (GCI) in the process of measuring, can introduce too much time delay because do like this, and in fact there is no need yet, because the Serving cell of initiating to measure has been set up one-to-one relationship between PCI and GCI.

But,,, may dispose a lot of adjacent cells under the macrocell such as the introducing of Home eNodeB along with the extensive use of small base station.Configuration adjacent cell relation between macrocell meeting that possible scene is a city square and the picocell near the office tower.Picocell quantity is so many, to such an extent as to the adjacent cell that is difficult to avoid having different global cell ID need be shared certain underlying protocol sub-district ID.This is because the quantity of the sub-district ID of underlying protocol is limited, and when the quantity of adjacent cell was abundant, the sub-district ID of unrenewable underlying protocol came unique differentiation adjacent cell.With the LTE system is example, and PCI is total to be no more than 510, when the quantity of adjacent cell exceeds this upper limit, the problems referred to above will take place.If operator has just distributed part PCI to use to Home eNodeB, this upper limit also can diminish so, and in other words, the problem of above-mentioned shared PCI can be more serious.

Also having a kind of reason that causes the problems referred to above is that the signaling capacity of expression adjacent cell is limited.Such as macrocell for a LTE, may can dispose the adjacent cell of 32 UTRAN (universal terrestrial access network) at most, these adjacent cells are represented in the mode of absolute frequency scrambled code.If actual adjacent cell more than 32, in the signaling that can be included in all adjacent cells the expression adjacent cell, the situation that an absolute frequency scrambled code corresponds to a plurality of adjacent cells will occur.

The RRM that this problem can lead to errors.With the LTE system is example, supposes to have set up one-to-one relationship in the neighbor cell list of Serving cell between PCI and GCI, such as between PCI_1 and the GCI_1 one-to-one relationship being arranged.But in the real network planning, because the shortage of PCI, the PCI of adjacent cell GCI_2 also is PCL_1.When the terminal actual measurement with when reporting PCI_1, Serving cell can have been thought terminal to report GCI_1, but in fact that this PCI_1 correspondence may be GCI_2.The Serving cell decision-making that will do to make mistake like this.Such as, if this measurement report has triggered switching, terminal should switch to GCI_2 so, but is required to switch to GCI_1 now, thereby causes handoff failure.

Under the situation of knowing the network planning in advance, if Serving cell is in neighbor cell list, between underlying protocol sub-district ID and global cell ID, set up the relation of one-to-many, generation also can lead to errors, because report in measurement report in the sub-district ID of underlying protocol when terminal, which adjacent cell what the base station also can't identification terminal reports actually is.

Summary of the invention

The technical problem to be solved in the present invention provides in a kind of wireless cellular communication system the method for measuring control, can avoid causing the RRM mistake when the corresponding a plurality of global cell ID of a underlying protocol sub-district ID.

In order to address the above problem, the invention provides the method for measuring control in a kind of wireless cellular communication system, may further comprise the steps:

The measurement control and the measurement of the adjacent cell of initiating at Serving cell report in the process, and whether the Serving cell indication is used to identify the pairing global cell ID of underlying protocol sub-district ID of adjacent cell local unique;

After terminal is finished measurement to adjacent cell, not local unique, then in the measurement report that reports, identify these adjacent cells with global cell ID as the pairing global cell ID of underlying protocol sub-district ID that has the adjacent cell that need report.

Further, the present invention also has following feature:

Before described Serving cell is initiated the measurement control of adjacent cell, neighbor cell list is set up in each sub-district, use same underlying protocol sub-district ID if any a plurality of adjacent cells, a plurality of global cell ID of the described underlying protocol of record sub-district ID correspondence in described neighbor cell list.

Further, this method specifically may further comprise the steps:

Described Serving cell sends to described terminal and measures the control signaling, and whether the global cell ID that comprises the underlying protocol sub-district ID correspondence that is used to identify adjacent cell in the adjacent cell information in the described measurement control signaling local unique sign;

After described terminal is received described measurement control signaling, finish measurement, if comprise adjacent cell in the adjacent cell of the measurement result correspondence of described measurement report with underlying protocol sub-district ID, then described terminal read the global cell ID of this adjacent cell in the past at reporting measurement reports, and then measurement result reported described Serving cell by measurement report, in the described measurement report with the described adjacent cell of global cell ID sign with underlying protocol sub-district ID.

Further, the present invention also has following feature:

Indicate the global cell ID of underlying protocol sub-district ID correspondence of measurand whether local unique with a sign in the measuring object information in the described measurement control signaling.

Further, the present invention also has following feature:

Described terminal in measuring process or finish measure the back reporting measurement reports before, read in the described measurement result system message with the adjacent cell of underlying protocol sub-district ID, obtain its global cell ID.

Further, this method specifically may further comprise the steps:

The Serving cell that connects with terminal sends measurement control signaling to described terminal;

Described terminal is received described measurement control signaling, finish measuring process and by measurement report to described Serving cell reporting measurement result, in this measurement report with underlying protocol sub-district ID sign adjacent cell;

Described Serving cell is received described measurement report, whether the global cell ID that judges the underlying protocol sub-district ID correspondence of the adjacent cell that comprises is local unique, if not, send the downlink signaling that requirement reports the global cell ID of described adjacent cell to described terminal;

Described terminal is received described downlink signaling, obtains the global cell ID of described adjacent cell, and identifies adjacent cell with global cell ID in measurement report.

Further, the present invention also has following feature:

Described terminal is obtained its global cell ID by reading in the described measurement result with the system message of the adjacent cell of underlying protocol sub-district ID.

Further, the present invention also has following feature:

When described adjacent cell was the LTE sub-district, the underlying protocol sub-district ID in described measurement control signaling and the described measurement report was the physical district ID of adjacent cell.

Further, the present invention also has following feature:

When described adjacent cell was the GERAN sub-district, the underlying protocol sub-district ID in the described measurement control signaling was the absolute frequency of adjacent cell; Underlying protocol sub-district ID in the described measurement report is the absolute frequency and the base station identity code of adjacent cell.

Further, the present invention also has following feature:

When described adjacent cell was the UTRAN sub-district, the underlying protocol sub-district ID in described measurement control signaling and the described measurement report was the absolute frequency and the scrambler of adjacent cell.

Measure the method for control in the wireless cellular communication system of the present invention, when the corresponding a plurality of global cell ID of underlying protocol sub-district ID, read the global cell ID of adjacent cell by terminal, come adjacent cell identified by this global cell ID and report Serving cell, thereby guarantee that Serving cell can accurately identify the adjacent cell of being correlated with in the measurement result of terminal, guarantees normally carrying out of RRM and operation.

Description of drawings

Fig. 1 is the embodiment that measures a kind of LTE adjacent cell of the method for controlling in the wireless cellular communication system of the present invention;

Fig. 2 is the embodiment that measures a kind of UTRAN adjacent cell of the method for controlling in the wireless cellular communication system of the present invention;

Fig. 3 is the embodiment that measures a kind of GERAN adjacent cell of the method for controlling in the wireless cellular communication system of the present invention.

Embodiment

From the angle of network, network at first needs to know in the planning of adjacent cell and exists a plurality of adjacent cells to share the situation of underlying protocol sub-district ID.For the level and smooth mobile management and the minimizing mistake that keep network, network can all enroll neighbor cell list to the adjacent cell of sharing underlying protocol sub-district ID.For fear of mistake or ambiguity occurring, just need be by the underlying protocol sub-district ID notice terminal of Serving cell with those corresponding a plurality of global cell ID, so that terminal further reads those global cell ID with the adjacent cell of underlying protocol sub-district ID and reports Serving cell, thereby guarantee that Serving cell makes correct processing.Adjacent cell with underlying protocol sub-district ID is meant that these adjacent cells have used same underlying protocol sub-district ID in certain sub-district.

Below in conjunction with accompanying drawing preferred embodiment of the present invention is described in more detail, but not as a limitation of the invention.

Supposing has a macrocell A in the LTE system, it has two adjacent cell B and C.The global cell ID (GCI) of these two adjacent cells is respectively " GCI_B " and " GCI_C "; The underlying protocol sub-district ID of adjacent cell B and C is " PCI ".The content of measuring the concrete ID in the control signaling depends on the type of adjacent cell.If adjacent cell B and C also are the LTE sub-districts, the underlying protocol sub-district ID that then measures in the control signaling is the physical district ID of adjacent cell; If adjacent cell B and C are the GERAN sub-districts, the ID that then measures in the control signaling is the absolute frequency of adjacent cell; If adjacent cell B and C are the UTRAN sub-districts, the ID that then measures in the control signaling is the absolute frequency and the scrambler of adjacent cell.

The content of concrete underlying protocol sub-district ID in measurement report also depends on the type of adjacent cell.If adjacent cell B and C also are the LTE sub-districts, then the ID in the measurement report is the physical district ID of adjacent cell; If adjacent cell B and C are the GERAN sub-districts, then the ID in the measurement report is the absolute frequency and the base station identity code (BSIC) of adjacent cell; If adjacent cell B and C are the UTRAN sub-districts, then the ID in the measurement report is the absolute frequency and the scrambler of adjacent cell.

Enumerating three embodiment below describes.

Embodiment 1:

Referring to Fig. 1, adopt the method for measuring the control signaling, be example with the LTE adjacent cell, the step of enforcement comprises:

Step 101: Serving cell A is after terminal is set up RRC (radio resource control) connection, send and measure the control signaling to terminal, measure the control signaling and measure type, trigger conditions, report the rule etc. except comprising, also whether the GCI of the underlying protocol sub-district ID correspondence of indication adjacent cell is local unique in measuring the measuring object part of control signaling, in the present embodiment, needing the indication physical district ID is not local unique for the GCI of the adjacent cell correspondence of " PCI ", as representing with a flag bit;

The GCI part of the underlying protocol sub-district ID correspondence of adjacent cell is unique, is meant in a certain sub-district, and the pairing global cell ID of underlying protocol sub-district ID under this sub-district is unique;

Step 103: trigger as measurement event, when perhaps terminal needed the periodicity reporting measurement reports, terminal found to comprise in the measurement report measurement result of adjacent cell B;

Step 104: because the GCI of the physical district ID correspondence of adjacent cell B is not local unique,, further obtain the GCI of adjacent cell B, be " GCI_B " so terminal reads the system message of adjacent cell B again;

In addition, terminal can just judge before measurement that also the GCI of the physical district ID correspondence of which adjacent cell is not local unique, directly reads the global cell ID of these adjacent cells in the measuring process;

Step 105: terminal identifies adjacent cell B with " GCI_B " to the Serving cell reporting measurement reports in the measurement report, and " GCI_B " and measurement event or measurement result are connected;

Step 106: Serving cell A receives after the above-mentioned measurement report, and measurement event or the measurement result of adjacent cell B in the measurement report are handled.

In the method for this embodiment, terminal does not need and network (Serving cell) is mutual once more, just can determine to report the global cell ID of adjacent cell, so it postpones weak point.

Embodiment 2:

Referring to Fig. 2, adopt the method for measuring the control signaling, be example with the UTRAN adjacent cell, the step of enforcement comprises:

Step 201: Serving cell A is after terminal is set up the RRC connection, send and measure the control signaling to terminal, measure the control signaling and measure type, trigger conditions except comprising, report the rule etc., also the absolute frequency of indication be that " F ", scrambler are not that the part is unique for the GCI of the adjacent cell correspondence of " PSC " in measuring object;

Step 202: terminal is received after the above-mentioned measurement control signaling, is started measuring process according to the indication of measuring the control signaling;

Step 203: trigger as measurement event, when perhaps terminal needed the periodicity reporting measurement reports, terminal found to comprise in the measurement report measurement result of adjacent cell B;

Step 204: because the absolute frequency of adjacent cell B is that " F ", scrambler are " PSC ", and absolute frequency is that " F ", scrambler are not local unique for the GCI of the adjacent cell correspondence of " PSC ", so terminal reads the system message of adjacent cell B again, further obtain the GCI of adjacent cell B, be " GCI_B ";

In addition, terminal can just judge before measurement that also the absolute frequency of which adjacent cell and the GCI of scrambler correspondence are not local unique, directly reads the global cell ID of these adjacent cells in the measuring process;

Step 205: terminal identifies adjacent cell B with " GCI_B " to the Serving cell reporting measurement reports in the measurement report, and " GCI_B " and measurement event or measurement result are connected;

Step 206: Serving cell A receives after the above-mentioned measurement report, and measurement event or the measurement result of adjacent cell B in the measurement report are handled.

Identical with embodiment 1, in the method for this embodiment, terminal does not need and network (Serving cell) is mutual once more, just can determine to report the global cell ID of adjacent cell, so it postpones weak point.

Embodiment 3:

Referring to Fig. 3, adopt the method that reports once more, be example with the GERAN adjacent cell, the step of enforcement comprises:

Step 301: Serving cell A is after terminal is set up the RRC connection, and transmission is measured the control signaling to terminal, measures to control to comprise measurement type, measurement target, trigger conditions in the signaling and report rule etc.;

Step 302: terminal is received after the above-mentioned measurement control signaling, is started measuring process according to the indication of measuring the control signaling;

Step 303: trigger as measurement event, when perhaps terminal needed the periodicity reporting measurement reports, terminal was to the Serving cell reporting measurement reports, and terminal finds to comprise in the measurement report measurement result of adjacent cell B; Absolute frequency " F " and base station identity code " BISC " with adjacent cell B in the measurement report identify adjacent cell;

Step 304: because absolute frequency and the base station identity code of adjacent cell B and C are identical, the base station of Serving cell is found and (F, BSIC) Dui Ying adjacent cell is not only one, so Serving cell A sends downlink signaling once more, requires the GCI of the corresponding adjacent cell of the absolute frequency of terminal to report and this;

Step 305: after terminal is received above-mentioned downlink signaling, read the system message of this adjacent cell B again, further obtain the GCI of adjacent cell B, be " GCI_B ";

Step 306: terminal is once more to the Serving cell reporting measurement reports, identifies this adjacent cell B with " GCI_B " that read in this measurement report, and " GCI_B " and measurement event or measurement result are connected;

Step 307: Serving cell A receives after the above-mentioned measurement report, and measurement event or the measurement result of adjacent cell B in the measurement report are handled.

In the method for this embodiment, need not to revise the content of measuring the control signaling, therefore do not need existing system is done bigger modification, versatility and favorable expandability realize simple.

Claims (10)

1. measure the method for controlling in a wireless cellular communication system, it is characterized in that, may further comprise the steps:

The measurement control and the measurement of the adjacent cell of initiating at Serving cell report in the process, and whether the Serving cell indication is used to identify the pairing global cell ID of underlying protocol sub-district ID of adjacent cell local unique;

After terminal is finished measurement to adjacent cell, not local unique, then in the measurement report that reports, identify these adjacent cells with global cell ID as the pairing global cell ID of underlying protocol sub-district ID that has the adjacent cell that need report.

2. the method for claim 1 is characterized in that,

Before described Serving cell is initiated the measurement control of adjacent cell, neighbor cell list is set up in each sub-district, use same underlying protocol sub-district ID if any a plurality of adjacent cells, a plurality of global cell ID of the described underlying protocol of record sub-district ID correspondence in described neighbor cell list.

3. the method for claim 1 is characterized in that, this method specifically may further comprise the steps:

Described Serving cell sends to described terminal and measures the control signaling, and whether the global cell ID that comprises the underlying protocol sub-district ID correspondence that is used to identify adjacent cell in the adjacent cell information in the described measurement control signaling local unique sign;

After described terminal is received described measurement control signaling, finish measurement, if comprise adjacent cell in the adjacent cell of the measurement result correspondence of described measurement report with underlying protocol sub-district ID, then described terminal read the global cell ID of this adjacent cell in the past at reporting measurement reports, and then measurement result reported described Serving cell by measurement report, in the described measurement report with the described adjacent cell of global cell ID sign with underlying protocol sub-district ID.

4. method as claimed in claim 3 is characterized in that,

Indicate the global cell ID of underlying protocol sub-district ID correspondence of measurand whether local unique with a sign in the measuring object information in the described measurement control signaling.

5. method as claimed in claim 3 is characterized in that,

Described terminal in measuring process or finish measure the back reporting measurement reports before, read in the described measurement result system message with the adjacent cell of underlying protocol sub-district ID, obtain its global cell ID.

6. the method for claim 1 is characterized in that, this method specifically may further comprise the steps:

The Serving cell that connects with terminal sends measurement control signaling to described terminal;

Described terminal is received described measurement control signaling, finish measuring process and by measurement report to described Serving cell reporting measurement result, in this measurement report with underlying protocol sub-district ID sign adjacent cell;

Described Serving cell is received described measurement report, whether the global cell ID that judges the underlying protocol sub-district ID correspondence of the adjacent cell that comprises is local unique, if not, send the downlink signaling that requirement reports the global cell ID of described adjacent cell to described terminal;

Described terminal is received described downlink signaling, obtains the global cell ID of described adjacent cell, and identifies adjacent cell with global cell ID in measurement report.

7. method as claimed in claim 6 is characterized in that,

Described terminal is obtained its global cell ID by reading in the described measurement result with the system message of the adjacent cell of underlying protocol sub-district ID.

8. as any described method in the claim 1～7, it is characterized in that,

When described adjacent cell was the LTE sub-district, the underlying protocol sub-district ID in described measurement control signaling and the described measurement report was the physical district ID of adjacent cell.

9. as any described method in the claim 1～7, it is characterized in that,

When described adjacent cell was the GERAN sub-district, the underlying protocol sub-district ID in the described measurement control signaling was the absolute frequency of adjacent cell; Underlying protocol sub-district ID in the described measurement report is the absolute frequency and the base station identity code of adjacent cell.

10. as any described method in the claim 1～7, it is characterized in that,

When described adjacent cell was the UTRAN sub-district, the underlying protocol sub-district ID in described measurement control signaling and the described measurement report was the absolute frequency and the scrambler of adjacent cell.

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