CN102238680A

CN102238680A - Heterogeneous network switching control method, signal transmission method, equipment and communication system

Info

Publication number: CN102238680A
Application number: CN2010101758456A
Authority: CN
Inventors: 覃忠宾; 万蕾; 熊新; 马莎
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2010-05-07
Filing date: 2010-05-07
Publication date: 2011-11-09
Anticipated expiration: 2030-05-07
Also published as: CN102238680B

Abstract

The embodiment of the invention discloses a heterogeneous network switching control method, a signal transmission method, signal transmission equipment and a communication system. In the embodiment of the invention, adjacent/covered overlapped base stations all adopt the combination design of first-type and second-type carriers, and at least a pair of the first-type and second-type carriers of the adjacent/covered overlapped base stations are identical in frequency; and the adjacent/covered overlapped base stations transmit physical downlink control channel (PDCCH) signaling, physical control format indicator channel (PCFICH) signaling, physical hybrid automatic repeat request indicator channel (PHICH) signaling and cell-specific reference symbols (CRS) in physical control channels of the first-type carriers, and transmit the CRSs on the second-type carriers. Therefore, user equipment (UE) can be ensured to obtain accurate physical control channel mobility measurement results of cells of the adjacent/covered overlapped base stations and timely trigger measurement reporting in same-frequency measurement; moreover, the service continuity of a user can be relatively better ensured, and unnecessary uplink/downlink data channel interference between neighbor cells can be avoided.

Description

Heterogeneous network method for handover control and signaling method and equipment and communication system

Technical field

The present invention relates to communication technical field, be specifically related to heterogeneous network method for handover control and signaling method and equipment and communication system.

Background technology

Along with the continuous evolution of communication system, developed at present and some have occurred and be applicable to that different scenes have the sub-district/network communication node of different coverages.

With third generation collaborative project (3GPP, 3rd Generation Partnership Project) Long Term Evolution/enhancing Long Term Evolution (LTE/LTE-A, Long Term Evolution/LTE-Advanced) system is an example, Home eNodeB (HeNB, Home eNB), the slight evolution base station (pico eNB) that is applicable to the residential quarter coverage that to be fit to the home/office coverage, the relay station (Relay) that is applicable to expansion macrocell edge throughput and macro base station etc. have been developed.Wherein, the deployment of multiple node can form the heterogeneous network communication scenes shown in Fig. 1-a, at some edges that covers crossover regions centre or cover crossover region, the up-downgoing transmission of subscriber equipment (UE, User Equipment) all might be subjected to the strong interference of adjacent cell transmission.Therefore, the interference coordination of two adjacent/minizones that covering overlaps will help the spectrum efficiency of whole elevator system and the spectrum efficiency of edge customer.

The interference coordination of heterogeneous network comprises the interference coordination of physical control channel and interference coordination two parts of physical data channel, wherein, the interference coordination of physical data channel can solve by carrying out coordinated scheduling between the base station, and the correct demodulation of physical control channel is the prerequisite of the correct demodulation of physical data channel.

The deployment of heterogeneous network may make the center of macrocell produce strong co-channel interference, causes the macrocell central user to suffer higher physical channel demodulation error probability.Referring to Fig. 1-b, in the prior art, a big carrier wave in sub-district is split into two little carrier waves, and (f1 f2), staggers the physical control channel of the sub-district of two overlappings/adjacent on frequency; Or at two different carrier waves (f1, f2) control channel of going up the sub-district of two overlappings/adjacent staggers on frequency.For example, physical control channel carrying Physical Downlink Control Channel (PDCCH on the carrier wave f1 of big coverage cell, Physical Downlink Control Channel) signaling, Physical Control Format Indicator Channel (PCFICH:Physical Control Format Indicator Channel) signaling, physical mixed feedback retransmission indicating chanel (PHICH:Physical Hybrid ARQ Indicator Channel) signaling and frequency pilot sign (CRS, Cell-Specific Reference Symbol) etc., the last physical control channel transmitted power of the carrier wave f2 of coverage cell is zero and greatly; And the carrier wave f2 of little coverage cell goes up physical control channel carrying PDCCH signaling and CRS etc., and it is zero that the carrier wave f1 of little coverage cell goes up the physical control channel transmitted power, and then realizes the control channel of the sub-district of two overlappings/adjacent is staggered on frequency.

In research and practice process to prior art, the inventor finds, avoids the mechanism of co-channel interference in the existing heterogeneous network, may cause carrying out too much different-frequency measure as the UE of LTE Rel-8/9 version, thereby increase the power consumption of UE because of different-frequency measure; And, when the UE of Rel-8/9 version enters the sub-district of little coverage in the sub-district by large coverage, the signal strength signal intensity of its physical control channel on carrier wave f1 is better than physical data channel, and UE carries out on physical control channel is mobility measurements, and what carry out on data channel is the measurement of scheduling property.At this moment, because the orthogonality of two minizone physical control channels, UE is when entering the overlay area of neighbor cell, because of the cell-of-origin still has mobility measurements performance preferably, carry out the sub-district and switch thereby can't in time trigger to respond with on the mobility of UE, and then cause physical data channel stronger interference may occur.

Summary of the invention

The embodiment of the invention provides a kind of heterogeneous network method for handover control and signaling method and equipment and communication system, help reducing the power consumption of UE different-frequency measure, guarantee the accuracy of UE, and measure the promptness that reports triggering the physical control channel mobility measurements of neighbor cell.

For solving the problems of the technologies described above, the embodiment of the invention provides following technical scheme:

A kind of physical control channel signaling method comprises:

First base station sends physical downlink control channel PDCCH signaling, Physical Control Format Indicator Channel PCFICH signaling, physical mixed feedback retransmission indicating chanel PHICH signaling and frequency pilot sign CRS at the physical control channel of first kind carrier wave, at the physical control channel transmission CRS of the second class carrier wave;

Adjacent with first base station/as to cover second base station that overlaps to send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS, at the physical control channel transmission CRS of the second class carrier wave at the physical control channel of first kind carrier wave;

Wherein, in the first kind carrier wave of first base station in the second class carrier wave of at least one carrier wave and second base station at least one carrier wave each other with carrier wave frequently; And/or, the same each other carrier wave frequently of at least one carrier wave in the first kind carrier wave of at least one carrier wave and second base station in the second class carrier wave of first base station.

A kind of heterogeneous network method for handover control comprises:

First base station receives the measurement report of reported by user equipment UE, described measurement report carries UE to first base station and the common frequency measurement information that is adjacent/covers second base station that overlaps, wherein, the carrier wave on the measurement frequency of described common frequency measurement information correspondence is the first kind carrier wave of first base station and the second class carrier wave of second base station; Or the carrier wave on the measurement frequency of described common frequency measurement information correspondence is the second class carrier wave of first base station and the first kind carrier wave of second base station; Wherein, the physical control channel of described first kind carrier wave carrying PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; The physical control channel carrying CRS of the described second class carrier wave;

Carry out the alien frequencies switch decision according to described common frequency measurement information;

If the result of alien frequencies switch decision carries out the condition that alien frequencies switches for satisfying based on common frequency measurement, then send handoff request message to second base station, described handoff request message is carried common frequency measurement and is triggered the indication information that alien frequencies switches.

A kind of communication system comprises:

First base station, and second base station of/covering overlapping adjacent with first base station;

First base station is used for sending PDCCH signaling, PCFICH signaling, PHICH signaling and CRS at the physical control channel of first kind carrier wave, at the physical control channel transmission CRS of the second class carrier wave;

Second base station is used for sending PDCCH signaling, PCFICH signaling, PHICH signaling and CRS at the physical control channel of first kind carrier wave, at the physical control channel transmission CRS of the second class carrier wave;

A kind of base station comprises:

Receiver module, be used to receive the measurement report of reported by user equipment UE, described measurement report carries UE to described base station and the common frequency measurement information that is adjacent/covers second base station that overlaps, wherein, the carrier wave on the measurement frequency of described common frequency measurement information correspondence is the first kind carrier wave of described base station and the second class carrier wave of second base station; Or the carrier wave on the measurement frequency of described common frequency measurement information correspondence is the second class carrier wave of described base station and the first kind carrier wave of second base station; Wherein, the physical control channel of described first kind carrier wave carrying PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; The physical control channel carrying CRS of the described second class carrier wave;

Judging module is used for carrying out the alien frequencies switch decision according to described common frequency measurement information;

Sending module, when the result who is used for determining the alien frequencies switch decision in described judging module carries out the condition that alien frequencies switches for satisfying based on common frequency measurement, send handoff request message to second base station, described handoff request message is carried common frequency measurement and is triggered the indication information that alien frequencies switches.

A kind of communication system comprises:

The described base station of the foregoing description.

Therefore, the Combination Design of the first kind carrier wave and the second class carrier wave is all adopted in adjacent in the embodiment of the invention/base station that covering overlaps, and at least one pair of is with frequently in the first kind carrier wave of adjacent/covering overlapping base station and the second class carrier wave, adjacent/as to cover the base station that overlaps to send the PDCCH signaling at the physical control channel of first kind carrier wave, the PCFICH signaling, PHICH signaling and CRS, and at second class carrier wave transmission CRS, therefore can guarantee that UE is when common frequency measurement, to the sub-district physical control channel mobility measurements result's of adjacent/base station of cover overlapping accuracy, and measure the promptness that reports triggering; And can guarantee user's service continuity preferably, and avoid neighboring interval meaningless on/downstream data channel disturbs.

Description of drawings

In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1-a is a kind of heterogeneous network schematic diagram that prior art provides;

Fig. 1-b is a kind of neighbor cell carrier wave design diagram that prior art provides;

Fig. 2-a is that the embodiment of the invention provides a kind of physical control channel design diagram;

Fig. 2-b is the Resource Block carrying schematic diagram that the embodiment of the invention provides a kind of physical control channel;

Fig. 2-c is that the embodiment of the invention provides a kind of adjacent area physical control channel design diagram;

Fig. 2-d is that the embodiment of the invention provides another kind of adjacent area physical control channel design diagram

Fig. 2-e is the schematic diagram that the embodiment of the invention provides a kind of measurement event and alignment processing rule;

Fig. 3 is that the embodiment of the invention one provides a kind of control channel signals sending method schematic flow sheet

Fig. 4 is that the embodiment of the invention two provides a kind of heterogeneous network method for handover control schematic flow sheet;

Fig. 5 is that the embodiment of the invention three provides a kind of heterogeneous network method for handover control schematic flow sheet;

Fig. 6 is that the embodiment of the invention provides a kind of communication system schematic diagram;

Fig. 7 is that the embodiment of the invention provides a kind of base station schematic diagram;

Fig. 8 is that the embodiment of the invention provides another kind of communication system schematic diagram;

Fig. 9 is that the embodiment of the invention provides another kind of base station schematic diagram.

Embodiment

The embodiment of the invention provides a kind of heterogeneous network method for handover control and relevant device and communication system, help reducing the power consumption of UE different-frequency measure, guarantee the accuracy of UE, and measure the promptness that reports triggering the physical control channel mobility measurements of neighbor cell.

Below be elaborated respectively.

The embodiment of the invention at first provides a kind of scheme of new physics channel design, referring to Fig. 2-a, in the embodiment of the invention base station carrier design is divided into and can comprises: two classes such as the first kind carrier wave and the second class carrier wave

In actual applications, a base station (as base station A) can comprise a plurality of first kind carrier waves and a plurality of second class carrier wave, and a first kind carrier wave correspondence a sub-district.One or more first kind carrier waves of base station A can be adjacent with base station A/and one or more second class carrier waves of covering another base station (as base station B) that overlaps are each other with carrier wave frequently, and/or, one or more second class carrier waves of base station A can with one or more first kind carrier waves of base station B each other with carrier wave frequently.At least one pair of is with the frequency carrier wave in the first kind carrier wave of adjacent/covering overlapping base station and the second class carrier wave.Wherein, refer to the identical carrier wave of centre frequency with the frequency carrier wave.

First kind carrier wave can comprise all or part element of physical control channel, for example can comprise physical mixed feedback retransmission indicating chanel (PHICH, Physical hybrid-ARQ indicator channel), Physical Control Format Indicator Channel (PCFICH, Physical control format indicator channel), PDCCH and CRS etc., and, can be distributed in the whole physical control channel frequency range of first kind carrier wave as elements such as CRS and PDCCH, Resource Block (the RB of physical control channel on the first kind carrier wave, the putting position of CRS Resource Block) and PDCCH signaling can be shown in the PCC among Fig. 2-b, the base station had both sent CRS at the physical control channel of first kind carrier wave and had also sent the PDCCH signaling, also can send PHICH signaling and PCFICH signaling etc. at the physical control channel of first kind carrier wave.

The second class carrier wave can be designed to comprise physical control channel, physical control channel carrying CRS (for example can only carry CRS) on the second class carrier wave, but do not carry as the PDCCH signaling etc.In actual applications, the second class carrier wave can be designed to two types, a kind of is that physical control channel has only centre frequency 1.25MHz to go up by normal power transmission CRS on the second class carrier wave, other position does not launch CRS or the CRS transmitting power is 0, another kind of then be that the frequency range of whole physical control channel on the second class carrier wave all sends CRS by normal power, the CRS putting position on the second class carrier wave on the Resource Block of physical control channel can be shown in the SCC1/SCC2 among Fig. 2-b.The base station can send CRS by a physical control channel at the second class carrier wave.

Need to prove that the transverse axis among Fig. 2-b is represented the OFDM symbol, the longitudinal axis is represented carrier frequency/frequency.Wherein, the OFDM symbol of physical control channel can be 1-3, when the symbol of physical control channel during less than 3, then remove 1 row or 2 row of the rightmost OFDM symbol indication among Fig. 2-b after, obtain the Resource Block schematic diagram of corresponding PCC and SCC.

Embodiment of the invention heterogeneous network switch method is mainly realized based on the physical channel design scheme shown in Fig. 2-a.Covering overlapping/adjacent base station sends CRS and PDCCH signaling etc. according to the physical control channel shown in Fig. 2-a, send CRS etc. on the physical control channel of the second class carrier wave on the physical control channel of first kind carrier wave.For example referring to Fig. 2-c, Fig. 2-d, base station A and base station B are for covering overlapping/adjacent base station, and base station A comprises the first kind carrier wave a1 and the second class carrier wave a2, and base station B comprises the first kind carrier wave b1 and the second class carrier wave b2.

Wherein, the first kind carrier wave a1 and the second class carrier wave b2 are each other with the frequency carrier wave, and the second class carrier wave a2 and first kind carrier wave b1 are each other with the frequency carrier wave.Base station A sends PDCCH signaling and CRS etc. on the physical control channel of first kind carrier wave a1, can only send CRS on the physical control channel of the second class carrier wave a2; Base station B sends PDCCH signaling and CRS etc. on the physical control channel of first kind carrier wave b1 (the same frequency carrier wave of the second class carrier wave a2), can only send CRS on the physical control channel of the second class carrier wave b2 (the same frequency carrier wave of first kind carrier wave a1).

For example UE is current resides under the A of base station, if UE is by measuring the signal strength signal intensity that CRS measures the sub-district physical control channel, then can pass through the common frequency measurement mode, measure the signal strength signal intensity of the last physical control channel of the first kind carrier wave a1 and the second class carrier wave b2, or measure the signal strength signal intensity of the second class carrier wave a2 and the last physical control channel of first kind carrier wave b1.

Practice is found, because all mobility measurements all carry out at CRS, therefore the CRS that keeps the control domain (being physical control channel) of the second class carrier wave, can guarantee the accuracy that UE measures physical control channel, and can't cause serious disturbance to the transmission of the PDCCH signaling of adjacent area (with carrier wave frequently) etc., if the CRS that only keeps the middle 1.25MHz of the second class carrier wave can further reduce not influencing the accuracy of UE mobility measurements when adjacent area PDCCH disturbs to be used for the mobility measurements of UE.Position in CRS to Resource Block of base station scheduling can be by the Physical Cell Identifier (PCI of sub-district, Physical Cell Identity) determines (for example the CRS position of SCC1 and SCC2 is inequality among Fig. 2-b), and UE will be from the 0th, the synchronizing channel of 5 subframes reads PCI, although synchronizing channel is arranged in the fixed position of physical data channel, but, need avoid the interference between the synchronizing channel of sub-district because synchronizing channel also requires the whole network to cover.In the embodiment of the invention, the base station of neighbor cell can be realized (making that promptly the 0th, 5 subframe of neighbor cell is not overlapping) by the system's subframe numbers that diverges to neighbor cell, and avoids strongly disturbing generation by corresponding coordinated scheduling.

And for UE, the large scale that a plurality of carrier wave experienced decline in a frequency band (band) has very strong similitude, the large scale decline that can decline with the large scale of a carrier wave to a certain extent and assess another carrier wave, therefore, physical channel design scheme based on the embodiment of the invention, overlap in the covering shown in for example Fig. 2-c and Fig. 2-d/adjacent base station under, if the current base station A that resides in of UE, UE goes up the mobility measurements result of physical control channel to the second class carrier wave b2 of base station B, its mobility measurements result to the last physical control channel of first kind carrier wave b1 of base station B of the representative that can be similar to, this just provides the foundation for the alien frequencies based on common frequency measurement switches.

Facts have proved that a rational handover mechanism need be avoided following two kinds of situations usually:

(1) table tennis (Pingpong) effect (promptly between cell-of-origin and Target cell frequent switching back and forth);

(2) too high handover failure rate.

In the embodiment of the invention, reasonably handover trigger can be undertaken by avoiding following situation: handover trigger causes frequent Pingpong and Radio Link Failure (RLF, Radio Link Failure) too early; Cross late handover trigger and cause RLF; Unreasonable handover trigger causes frequent handover operation.

LTE Rel-8/9 towards the homogeneous network system in, mobility measurements reported event and the alignment processing rule of switching the RRM algorithm are shown in Fig. 2-e.Before A2 (the Serving cell quality is better than threshold value) reporting events triggers switching, the base station may receive A3 (the neighbor cell quality is better than Serving cell and surpasses threshold value) incident, A4 (the neighbor cell quality the is better than threshold value) incident from UE, the reporting events of the common frequency measurement of A5 (the Serving cell quality is worse than threshold value 1 and the neighbor cell quality is better than threshold value 2) incident etc.And under the homogeneous network scene, this means that UE need carry out with switching frequently.Yet, under the heterogeneous network scene, adopting as after the carrier wave physical control channel design in Fig. 1-b or the employing embodiment of the invention for guaranteeing the control channel frequency orthogonal, UE can not carry out between neighbor cell with switching frequently.Therefore, if the alien frequencies that can not carry out based on common frequency measurement switches (perhaps, statistics shows that the alien frequencies switching based on common frequency measurement can cause serious ping-pong or too high handover failure rate), to report and can trigger the base station equally be operation of UE configuration different-frequency measure and parameter to the common frequency measurement of A3/A4/A5 incident so, certainly, the parameter configuration of different-frequency measure need be finished with reference to the performance of handoffs of the corresponding alien-frequency district (carrier wave) in the heterogeneous network destination node.

Below by specific embodiment, to embodiment of the invention signalling case, and be elaborated based on the alien frequencies handover scheme of common frequency measurement, wherein, the first kind carrier wave and the second class carrier wave that cover overlapping/adjacent base station adopt for example scheme of physical channel design shown in Fig. 2-a.

Embodiment one

An embodiment of embodiment of the invention physical control channel signaling method, can comprise: first base station sends PDCCH signaling, PCFICH signaling, PHICH signaling and frequency pilot sign CRS at the physical control channel of first kind carrier wave, at the physical control channel transmission CRS of the second class carrier wave; Adjacent with first base station/as to cover second base station that overlaps to send PDCCH signaling, PCFICH signaling, PHICH signaling and CRS, at the physical control channel transmission CRS of the second class carrier wave at the physical control channel of first kind carrier wave; Wherein, in the first kind carrier wave of first base station in the second class carrier wave of at least one carrier wave and second base station at least one carrier wave each other with carrier wave frequently; And/or, the same each other carrier wave frequently of at least one carrier wave in the first kind carrier wave of at least one carrier wave and second base station in the second class carrier wave of first base station.

Referring to Fig. 3, specifically can comprise:

310, first base station sends PDCCH signaling, PCFICH signaling, PHICH signaling and frequency pilot sign CRS at the physical control channel of first kind carrier wave, at the physical control channel transmission CRS of the second class carrier wave;

Under a kind of application scenarios, first base station can be at the physical control channel pilot symbol transmitted CRS of its one or more first kind carrier waves, and in PDCCH signaling, PCFICH signaling and the PHICH signaling one or more etc., can also send CRS (for example can only send CRS) at the physical control channel of its one or more second class carrier waves.

320, second base station of/covering overlapping adjacent with first base station sends PDCCH signaling, PCFICH signaling, PHICH signaling and CRS at the physical control channel of first kind carrier wave, at the physical control channel transmission CRS of the second class carrier wave.

Under a kind of application scenarios, second base station can be at the physical control channel pilot symbol transmitted CRS of its one or more first kind carrier waves, and in PDCCH signaling, PCFICH signaling and the PHICH signaling one or more etc., can also send CRS (for example can only send CRS) at the physical control channel of its one or more second class carrier waves.

In actual applications, first base station (or second base station) can send pilot tone CRS in the whole frequency of the physical control channel of the second class carrier wave; Or, send pilot tone CRS at the centre frequency 1.25MHz of the physical control channel of the second class carrier wave.

Further, this moment is if the serving BS of UE is first base station, UE carries out common frequency measurement on the first kind carrier wave of first base station, can obtain the signal strength signal intensity of the physical control channel of second base station on this frequency, and can be when satisfying reported event condition (for example A2/A3/A4/A5), to the first base station reporting measurement reports,, then can trigger based on common frequency measurement and carry out the flow process that alien frequencies switches if the carrier wave of second base station on this frequency is the second class carrier wave.

As seen from the above, the Combination Design of the first kind carrier wave and the second class carrier wave is all adopted in adjacent in the present embodiment/base station that covering overlaps, and at least one pair of is with frequently in the first kind carrier wave of adjacent/covering overlapping base station and the second class carrier wave, adjacent/as to cover the base station that overlaps to send the PDCCH signaling at the physical control channel of first kind carrier wave, the PCFICH signaling, PHICH signaling and CRS, and at second class carrier wave transmission CRS, therefore can guarantee that UE is when common frequency measurement, to the sub-district physical control channel mobility measurements result's of adjacent/base station of cover overlapping accuracy, and measure the promptness that reports triggering; And can guarantee user's service continuity preferably, and avoid neighboring interval meaningless on/downstream data channel disturbs.

Embodiment two

Based on the physical control channel signal transmitter system among the embodiment one, an embodiment of embodiment of the invention heterogeneous network method for handover control, can comprise: first base station receives the measurement report of reported by user equipment UE, this measurement report carries UE to first base station and the common frequency measurement information that is adjacent/covers second base station that overlaps, wherein, the carrier wave on the measurement frequency of this common frequency measurement information correspondence is the first kind carrier wave of first base station and the second class carrier wave of second base station; Or the carrier wave on the measurement frequency of this common frequency measurement information correspondence is the second class carrier wave of first base station and the first kind carrier wave of second base station; Wherein, the physical control channel of first kind carrier wave carrying PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; The physical control channel carrying CRS of the second class carrier wave; Carry out the alien frequencies switch decision according to above-mentioned common frequency measurement information; If the result of alien frequencies switch decision carries out the condition that alien frequencies switches for satisfying based on common frequency measurement, then send handoff request message to second base station, this handoff request message is carried common frequency measurement and is triggered the indication information that alien frequencies switches.

Referring to Fig. 4, specifically can comprise:

410, first base station receives the measurement report of reported by user equipment UE, and this measurement report carries UE to first base station and the common frequency measurement information that is adjacent/covers second base station that overlaps;

Wherein, the carrier wave on the measurement frequency of this common frequency measurement information correspondence is the first kind carrier wave of first base station and the second class carrier wave of second base station; Or the carrier wave on the measurement frequency of this common frequency measurement information correspondence is the second class carrier wave of first base station and the first kind carrier wave of second base station; Wherein, the physical control channel of first kind carrier wave carrying PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; The physical control channel carrying CRS of the second class carrier wave.

Under a kind of application scenarios, first base station and second base station can be at the physical control channel pilot symbol transmitted CRS of its one or more first kind carrier waves, and in PDCCH signaling, PCFICH signaling and the PHICH signaling one or more etc., can also send CRS at the physical control channel of its one or more second class carrier waves and (for example, can be only send CRS in the whole frequency of the physical control channel of the second class carrier wave; Or, send CRS at the centre frequency 1.25MHz of the physical control channel of the second class carrier wave.The UE that resides under first base station can adopt the common frequency measurement mode, measure in first base station and second base station with two carrier waves (certain second class carrier wave of certain first kind carrier wave of first base station and second base station frequently, perhaps, certain second class carrier wave of first base station and certain first kind carrier wave of second base station) on the signal strength signal intensity of physical control channel, and can be when satisfying reporting events condition (for example A2/A3/A4/A5 incident), to the first base station reporting measurement reports, trigger based on common frequency measurement and carry out the flow process that alien frequencies switches.

420, the alien frequencies switch decision is carried out according to above-mentioned common frequency measurement information in first base station;

Under a kind of application scenarios, first base station can estimate that with reference to common frequency measurement the error deviation value of alien frequencies channel conditions is carried out the alien frequencies switch decision according to the common frequency measurement information in the measurement report.Wherein, the decision rule of alien frequencies switching can pre-establish.

For instance, first base station can surpass setting threshold for the neighbor cell quality is better than Serving cell at the reported event of determining the UE common frequency measurement, and the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches; Otherwise, can adjudicate alien frequencies and switch the condition that does not satisfy based on the switching of common frequency measurement execution alien frequencies.

Or, first base station also can be worse than threshold value 1 for the Serving cell quality at the reported event of definite UE common frequency measurement and the neighbor cell quality is better than threshold value 2, and the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches; Otherwise can adjudicate alien frequencies and switch the condition that does not satisfy based on the switching of common frequency measurement execution alien frequencies.

Or first base station also can be better than setting threshold for the neighbor cell quality at the reported event of determining the UE common frequency measurement; And the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches; Otherwise can adjudicate alien frequencies and switch the condition that does not satisfy based on the switching of common frequency measurement execution alien frequencies.

430, if the alien frequencies handoff decision result of first base station is carried out the condition that alien frequencies switches for satisfying based on common frequency measurement, first base station sends handoff request message to second base station, and this handoff request message is carried common frequency measurement and triggered the indication information that alien frequencies switches.

Second base station can receive the handoff request that first base station sends, the indication information that triggers the alien frequencies switching according to common frequency measurement knows that this switching is based on the alien frequencies switching of common frequency measurement, the alien frequencies switching is carried out in second base station, for UE prepares switchable resource, UE and then can be linked into target BS realizes that carrying out alien frequencies based on common frequency measurement switches.

In addition,, then can be UE and carry out the different-frequency measure configuration, and then can trigger and carry out traditional flow process of carrying out the alien frequencies switching based on different-frequency measure if the result of the alien frequencies switch decision of first base station does not satisfy based on common frequency measurement to carry out the condition that alien frequencies switches.

Further, the adjustment that the error deviation value of alien frequencies channel conditions suits can be estimated to common frequency measurement in first base station, so that its reasonably optimizing more.

Under a kind of application scenarios, the first base station may command UE carries out the measurement and the reporting measurement result of a plurality of frequencies; According to the measurement result that UE reports, determine or adjust the error deviation value of common frequency measurement estimation alien frequencies channel conditions.And/or behind the alien frequencies handoff failure based on common frequency measurement, the network side statistics is carried out the performance parameter of alien frequencies handoff failure based on common frequency measurement, and adjusts the error deviation value of common frequency measurement estimation alien frequencies channel conditions according to this performance parameter; Wherein, performance parameter can comprise: switch too early the Radio Link Failure that causes or ping-pong probability, cross probability of the probability that switches the Radio Link Failure that causes evening, frequent handover operation that unreasonable switching causes or the like.

As seen from the above, the Combination Design of the first kind carrier wave and the second class carrier wave is all adopted in adjacent in the present embodiment/base station that covering overlaps, and at least one pair of is with frequently in the first kind carrier wave of adjacent/covering overlapping base station and the second class carrier wave, adjacent/as to cover the base station that overlaps to send the PDCCH signaling at the physical control channel of first kind carrier wave, the PCFICH signaling, PHICH signaling and CRS, and at second class carrier wave transmission CRS, therefore can guarantee that UE is when common frequency measurement, to the sub-district physical control channel mobility measurements result's of adjacent/base station of cover overlapping accuracy, and measure the promptness that reports triggering; And can guarantee user's service continuity preferably, and avoid neighboring interval meaningless on/downstream data channel disturbs; Owing to introduce based on common frequency measurement and carry out the mechanism that alien frequencies switches, can avoid the consumption of meaningless different-frequency measure to UE power.

Embodiment three

For ease of better understanding, carrying out a kind of process that heterogeneous network switches with UE below is example, and the scheme of the embodiment of the invention is made a more detailed description.Referring to Fig. 5, another embodiment to embodiment of the invention heterogeneous network method for handover control can comprise:

501, eNB-A measures control to UE;

Wherein, eNB-A (source eNB) can indicate UE periodically or acyclic measurement adjacent/cover overlapping signal of base station intensity, the measurement neighboring area signal intensity that UE also can be initiatively.

Under a kind of application scenarios, eNB can add up based on common frequency measurement and carry out the correlated performance parameter that alien frequencies switches.But the eNB-A grid of reference is based on the statistical computation result of the performance parameter of the alien frequencies switching of common frequency measurement, for UE disposes the trigger parameter (comprise the relevant limit of configuration threshold value, trigger amount of hysteresis etc.) that rational measurement event reports.

In actual applications, during trigger parameter among the eNB allocating and measuring reported event A3/A4/A5, need trigger the measured deviation that alien frequencies switches with reference to the result of common frequency measurement.

502, UE wherein carries common frequency measurement information to the eNB-A reporting measurement reports;

In the present embodiment, the measurement report that UE reports carries UE to eNB-A and the common frequency measurement information that is adjacent/covers the eNB-B that overlaps, and comprises the signal strength information of mobility measurements etc.;

Wherein, the carrier wave on the measurement frequency of this common frequency measurement information correspondence is the first kind carrier wave of eNB-A and the second class carrier wave of eNB-B; Or the carrier wave on the measurement frequency of this common frequency measurement information correspondence is the second class carrier wave of eNB-A and the first kind carrier wave of eNB-B; Wherein, the physical control channel of first kind carrier wave carrying PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; The physical control channel carrying CRS of the second class carrier wave.

Under a kind of application scenarios, eNB-A and eNB-B can be at the physical control channel pilot symbol transmitted CRS of its one or more first kind carrier waves, and in PDCCH signaling, PCFICH signaling and the PHICH signaling one or more etc., can also on the physical control channel of its one or more second class carrier waves, send CRS (as can be only sending CRS in the whole frequency of the physical control channel of the second class carrier wave; Or, send CRS at the centre frequency 1.25MHz of the physical control channel of the second class carrier wave).The UE that resides under the eNB-A can adopt the common frequency measurement mode, measure the signal strength signal intensity of the physical control channel on same two carrier waves frequently among eNB-A and the eNB-B, and when satisfying reporting events condition (for example A2/A3/A4/A5 incident), to the eNB-A reporting measurement reports, carry out the flow process that alien frequencies switches to trigger based on common frequency measurement.

503, eNB-A receives the measurement report that UE reports, and carries out the alien frequencies switch decision according to the common frequency measurement information in this measurement report.

Under a kind of application scenarios, the common frequency measurement result that eNB-A can report according to the A3/A4/A5 Event triggered of UE common frequency measurement estimates that with reference to common frequency measurement the error deviation value etc. of alien frequencies channel conditions is carried out the alien frequencies switch decision.Wherein, common frequency measurement is estimated that the error deviation value of alien frequencies channel conditions can preset or by a plurality of different-frequency measure results that eNB-A reports according to UE, is determined or adjust the error deviation value of common frequency measurement estimation alien frequencies channel conditions; And/or, behind alien frequencies handoff failure, carry out the performance parameter of alien frequencies handoff failure by network statistics based on common frequency measurement, and can adjust the error deviation value that common frequency measurement is estimated the alien frequencies channel conditions according to this performance parameter based on common frequency measurement; Wherein, performance parameter can comprise: the switching of failure be from which cell-of-origin to which Target cell (available switching is identified), too early switch the Radio Link Failure that causes or ping-pong probability, cross probability of the probability that switches the Radio Link Failure that causes evening, frequent handover operation that unreasonable switching causes or the like.

Carry out the switching requirement that alien frequencies switches, execution in step 504 if satisfy common frequency measurement; If do not satisfy, then can be UE and distribute Measurement Gap, the different-frequency measure of operative norm triggers the flow process that alien frequencies switches, this moment the UE common frequency measurement the A3/A4/A5 reporting events, triggering source eNB is UE configuration different-frequency measure operation and parameter, certainly, the parameter configuration of different-frequency measure need be finished with reference to the performance of handoffs of the corresponding alien-frequency district in the heterogeneous network destination node, and the flow process that the different-frequency measure of standard triggering alien frequencies switches repeats no more herein.

504, eNB-A sends handoff request message to eNB-B;

In actual applications, eNB-A can carry common frequency measurement and trigger the indication information that alien frequencies switches in handoff request message, and this switches to the alien frequencies switching that common frequency measurement triggers notice eNB-B (target eNB).

505, eNB-B receives the handoff request message that eNB-A sends, and UE is carried out access control;

Wherein, eNB-B can trigger the indication that alien frequencies switches according to the common frequency measurement in the handoff request message, know that this switching is based on the alien frequencies switching of common frequency measurement, according to the alien frequencies switch mode UE is carried out access control, if allow UE to insert, then for UE prepares corresponding switchable resource, execution in step 506, if do not allow UE to insert, but process ends then.

Further, network (eNB) can trigger on the basis of the performance statistics that switches with the alien frequencies of switching/different-frequency measure triggering frequently at common frequency measurement, increase common frequency measurement and trigger the performance statistics that alien frequencies switches, initiate after network reconnects whenever handoff failure occurring, network can be determined according to the information that UE reports:

(1) whether the failure of this time switching is the alien frequencies handoff failure that belongs to based on common frequency measurement;

(2) which Target cell the switching of this time failure is to from which cell-of-origin;

(3) failure of this time switching is to belong to too early handover trigger, and crossing late handover trigger still is the handoff failure that unreasonable handover trigger caused.

ENB can be according to the statistics of respective performances parameter, estimate that with the measurement event trigger parameter, the common frequency measurement that common frequency measurement are triggered under the alien frequencies handoff scenario alien frequencies switching control parameters such as error deviation value of alien frequencies channel conditions carry out the adjustment of suitability, replace different-frequency measure to trigger alien frequencies switching the error that is caused constantly to remedy common frequency measurement, avoid common frequency measurement to trigger alien frequencies as far as possible and switch the Pingpong effect that causes and too high handover failure rate.

For example, eNB adds up discovery before this, when common frequency measurement estimates that the error deviation value of alien frequencies channel conditions is set to S1, based on the alien frequencies success rate for switching of common frequency measurement less than 95%, estimate the error deviation value of alien frequencies channel conditions when common frequency measurement and be set to S2 (S2＜S1), greater than 98%, then eNB estimates that with common frequency measurement the error deviation value of alien frequencies channel conditions is adjusted into S2, by that analogy based on the alien frequencies handover success rate of common frequency measurement.

506, eNB-B sends switching request acknowledgement message to eNB-A, and wherein carrying eNB-B is that UE prepares switchable resource information.

507, eNB-A receives the switching request acknowledgement message that eNB-B sends, and knows that eNB-B allows UE to insert, and sends switching command to UE, and indication UE inserts eNB-B, and carrying eNB-B in the switching command is that UE prepares switchable resource information.

At this moment, eNB-A is if receive the downlink data of UE, and eNB-A can be to the downlink data of eNB-B forward pass UE.The downlink data of the UE that turns over before the eNB-B buffer memory eNB-A.

508, the UE uplink synchronous sends the request that inserts at random to Target cell to eNB-B, wherein carries leading Preamble.

509, eNB-B is that UE distributes ascending wireless resource, and to UE transmission accidental access response, wherein carrying eNB-B is the ascending wireless resource information (indication uplink time) of UE distribution and the Timing Advance information such as (TA, Time AdCanced) that UE sends upstream data.

510, UE sends switch acknowledgment message to eNB-B;

511, eNB-B is to MME transmit path conversion request, and request is changed the data transfer path of UE;

512, MME sends user's face update request to service webmaster (SGW, Servering Getway);

513, the transmission path of the downlink data of SGW conversion UE;

514, SGW sends user's face renewal response to MME;

515, MME is to eNB-B transmit path transition response, and eNB-B can know in view of the above that the transmission path of the downlink data of UE converts;

516, eNB-B indication eNB-A discharges respective resources.

ENB-A discharges the respective resources of UE, empties the downlink data buffer memory of corresponding UE, and continuation is become a full member before eNB-B at the UE downlink data of transmission.

Follow-up UE just can be directly by eNB-B and network interaction packet.

As can be seen, adjacent in the present embodiment/eNB (eNB-A and eNB-B) that covering overlaps all adopts the Combination Design of the first kind carrier wave and the second class carrier wave, and have at least a pair of in the first kind carrier wave of adjacent/covering overlapping eNB and the second class carrier wave with frequently, adjacent/as to cover the eNB that overlaps to send the PDCCH signaling at the physical control channel of first kind carrier wave, the PCFICH signaling, PHICH signaling and CRS, and at second class carrier wave transmission CRS, therefore can guarantee that UE is when common frequency measurement, to the sub-district physical control channel mobility measurements result's of adjacent/base station of cover overlapping accuracy, and measure the promptness that reports triggering; And can guarantee user's service continuity preferably, and avoid neighboring interval meaningless on/downstream data channel disturbs; Owing to introduce based on common frequency measurement and carry out the mechanism that alien frequencies switches, can avoid the consumption of meaningless different-frequency measure to UE power.

Further, above-mentioned handover scheme possesses good backwards compatibility, also can switch smoothly and work without any need for changing under the heterogeneous network scene as the UE of LTE Rel-8/Rel-9 version.

Further, for ease of the said method of the better implement embodiment of the invention, the embodiment of the invention also provides corresponding dress.

Also provide a kind of communication system referring to Fig. 6, the embodiment of the invention, comprising: first base station 610, and it is 610 adjacent/as to cover second base station 620 that overlaps with first base station.

Wherein, first base station 610 is used for sending PDCCH signaling, PCFICH signaling, PHICH signaling and CRS at the physical control channel of first kind carrier wave, at the physical control channel transmission CRS of the second class carrier wave;

Second base station 620 is used for sending PDCCH signaling, PCFICH signaling, PHICH signaling and CRS at the physical control channel of first kind carrier wave, at the physical control channel transmission CRS of the second class carrier wave;

Wherein, in the first kind carrier wave of first base station 610 in the second class carrier wave of at least one carrier wave and second base station 620 at least one carrier wave each other with carrier wave frequently; And/or, the same each other carrier wave frequently of at least one carrier wave in the first kind carrier wave of at least one carrier wave and second base station 620 in the second class carrier wave of first base station 610.

Under a kind of application scenarios, first base station 610 (or second base station 620) can send CRS in the whole frequency of the physical control channel of the second class carrier wave; Or, send CRS at the centre frequency 1.25MHz of the physical control channel of the second class carrier wave.

Further, this moment is if the serving BS of UE is first base station 610, UE carries out common frequency measurement on the first kind carrier wave of first base station 610, can obtain the signal strength signal intensity of second physical control channel of base station 620 on this frequency, and can be when satisfying reported event condition (for example A2/A3/A4/A5), to first base station, 610 reporting measurement reports,, then can trigger based on common frequency measurement and carry out the flow process that alien frequencies switches if second carrier wave of base station 620 on this frequency is the second class carrier wave.

Be appreciated that, present embodiment first base station 610 can be as the eNB-A among the above-mentioned method embodiment, and second base station 620 can be used for realizing its whole schemes as the eNB-B among the above-mentioned method embodiment, its specific implementation process repeats no more with reference to the associated description among the said method embodiment herein.

As seen from the above, the Combination Design of the first kind carrier wave and the second class carrier wave is all adopted in adjacent in the present embodiment/base station (first base station 610 and first base station 620) that covering overlaps, and at least one pair of is with frequently in the first kind carrier wave of adjacent/covering overlapping base station and the second class carrier wave, adjacent/as to cover the base station that overlaps to send the PDCCH signaling at the physical control channel of first kind carrier wave, the PCFICH signaling, PHICH signaling and CRS, and at second class carrier wave transmission CRS, therefore can guarantee that UE is when common frequency measurement, to the sub-district physical control channel mobility measurements result's of adjacent/base station of cover overlapping accuracy, and measure the promptness that reports triggering; And can guarantee user's service continuity preferably, and avoid neighboring interval meaningless on/downstream data channel disturbs.

Also provide a kind of base station 700 referring to Fig. 7, the embodiment of the invention, comprising: receiver module 710, judging module 720 and sending module 730.

Wherein, receiver module 710, be used to receive the measurement report that UE reports, this measurement report carries UE to described base station and the common frequency measurement information that is adjacent/covers second base station that overlaps, wherein, the carrier wave on the measurement frequency of this common frequency measurement information correspondence is the first kind carrier wave of base station 700 and the second class carrier wave of second base station; Or the carrier wave on the measurement frequency of this common frequency measurement information correspondence is the second class carrier wave of described base station 700 and the first kind carrier wave of second base station;

Wherein, the physical control channel of first kind carrier wave carrying PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; The physical control channel carrying CRS of the second class carrier wave;

Judging module 720 is used for carrying out the alien frequencies switch decision according to above-mentioned common frequency measurement information;

Sending module 730 is used for sending handoff request message to second base station when the condition of switching based on common frequency measurement execution alien frequencies is satisfied in judging module 720 judgement alien frequencies switchings, and this handoff request message is carried the indication information that common frequency measurement triggering alien frequencies switches.

Second base station can receive the handoff request that first base station sends, alien frequencies based on common frequency measurement when knowing that according to the indication information of common frequency measurement triggering alien frequencies switching this switches switches, the alien frequencies switching is carried out in second base station, for UE prepares switchable resource, UE and then can be linked into target BS realizes that carrying out alien frequencies based on common frequency measurement switches.

Under a kind of application scenarios, judging module 720 specifically is used for, and according to described common frequency measurement information, estimates that with reference to common frequency measurement the error deviation value of alien frequencies channel conditions is carried out the alien frequencies switch decision.

Wherein, judging module 720 can comprise:

The first judgement submodule, be used for surpassing setting threshold for the neighbor cell quality is better than Serving cell at the reported event of determining the UE common frequency measurement, and the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches; Or,

The second judgement submodule, be used for being worse than threshold value 1 for the Serving cell quality and the neighbor cell quality is better than threshold value 2 at the reported event of determining the UE common frequency measurement, and the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches; Or,

The 3rd judgement submodule, be used for being better than setting threshold for the neighbor cell quality at the reported event of determining the UE common frequency measurement, and the error that common frequency measurement is estimated the alien frequencies channel conditions is within the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches.

Under a kind of application scenarios, base station 700 can also comprise:

Trigger module is used for when the condition of switching based on common frequency measurement execution alien frequencies is not satisfied in judging module 720 judgement alien frequencies switchings, for this UE carries out the different-frequency measure configuration.And then can trigger to carry out and traditional carry out the flow process that alien frequencies switches based on different-frequency measure.

Under a kind of application scenarios, base station 700 also can comprise:

Control module is used to control UE and carries out a plurality of different-frequency measures and reporting measurement result;

First adjusting module is used for the measurement result that reports according to UE, determines or adjusts the error deviation value that common frequency measurement is estimated the alien frequencies channel conditions.

Under a kind of application scenarios, base station 700 also can comprise:

Second adjusting module is used for behind the alien frequencies handoff failure based on common frequency measurement, carries out the performance parameter of alien frequencies handoff failure by statistics based on common frequency measurement, and adjusts the error deviation value of common frequency measurement estimation alien frequencies channel conditions with reference to this performance parameter; Wherein, performance parameter can comprise: switch too early the Radio Link Failure that causes or ping-pong probability, cross the probability of the probability that switches the Radio Link Failure that causes evening, frequent handover operation that unreasonable switching causes.

Be appreciated that present embodiment base station 700 can be used for realizing its whole schemes as the eNB-A among the above-mentioned method embodiment, its specific implementation process repeats no more with reference to the associated description among the said method embodiment herein.

As can be seen, the Combination Design of the first kind carrier wave and the second class carrier wave is all adopted in adjacent in the present embodiment/base station (base station 700 and second base station) that covering overlaps, and have at least a pair of in the first kind carrier wave of adjacent/covering overlapping eNB and the second class carrier wave with frequently, adjacent/as to cover the base station that overlaps to send the PDCCH signaling at the physical control channel of first kind carrier wave, the PCFICH signaling, PHICH signaling and CRS, and at second class carrier wave transmission CRS, therefore can guarantee that UE is when common frequency measurement, to the sub-district physical control channel mobility measurements result's of adjacent/base station of cover overlapping accuracy, and measure the promptness that reports triggering; And can guarantee user's service continuity preferably, and avoid neighboring interval meaningless on/downstream data channel disturbs; Owing to introduce based on common frequency measurement and carry out the mechanism that alien frequencies switches, can avoid the consumption of meaningless different-frequency measure to UE power.

The embodiment of the invention also provides a kind of communication system, comprising: base station 810, and it is 810 adjacent/as to cover another base station 820 that overlaps with the base station.

Wherein, base station 810, be used to receive the measurement report that UE reports, this measurement report carries the common frequency measurement information of UE to base station 810 and another base station 820, wherein, the carrier wave on the measurement frequency of this common frequency measurement information correspondence is the first kind carrier wave of base station 810 and the second class carrier wave of another base station 820; Or the carrier wave on the measurement frequency of this common frequency measurement information correspondence is the second class carrier wave of base station 810 and the first kind carrier wave of another base station 820; Wherein, the physical control channel of first kind carrier wave carrying PDCCH signaling, PCFICH signaling, PHICH signaling and CRS; The physical control channel carrying CRS of the second class carrier wave; Carry out the alien frequencies switch decision according to above-mentioned common frequency measurement information; If the result of alien frequencies switch decision carries out the condition that alien frequencies switches for satisfying based on common frequency measurement, then send handoff request message to another base station 820, this handoff request message is carried common frequency measurement and is triggered the indication information that alien frequencies switches.

Another base station 820 receives the handoff request that base station 810 sends, and can carry out the access control of UE according to the alien frequencies switch mode.

In addition, if the result of alien frequencies switch decision does not satisfy based on common frequency measurement to carry out the condition that alien frequencies switches, then carry out the different-frequency measure configuration for UE.And then can trigger to carry out and traditional carry out the flow process that alien frequencies switches based on different-frequency measure.

Be appreciated that, present embodiment base station 810 can be as the eNB-A among the above-mentioned method embodiment, and base station 820 can be used for realizing its whole schemes as the eNB-B among the above-mentioned method embodiment, its specific implementation process repeats no more with reference to the associated description among the said method embodiment herein.

The embodiment of the invention also provides a kind of communication system, can comprise: base station 700.

The embodiment of the invention also provides a kind of base station 900, comprising::

First sending module 910, the physical control channel that is used in the base station 900 first kind carrier wave sends PDCCH signaling, PCFICH signaling, PHICH signaling and CRS;

Second sending module 920, the physical control channel that is used in the base station 900 the second class carrier wave sends CRS.

Need to prove, for aforesaid each method embodiment, for simple description, so it all is expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not subjected to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the specification all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.

In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, do not have the part that describes in detail among certain embodiment, can be referring to the associated description of other embodiment.

To sum up, the Combination Design of the first kind carrier wave and the second class carrier wave is all adopted in adjacent in the embodiment of the invention/base station that covering overlaps, and have at least a pair of in the first kind carrier wave of adjacent/covering overlapping base station and the second class carrier wave with frequently, adjacent/as to cover the base station that overlaps to send the PDCCH signaling at the physical control channel of first kind carrier wave, the PCFICH signaling, PHICH signaling and CRS, and at second class carrier wave transmission CRS, therefore can guarantee that UE is when common frequency measurement, to the sub-district physical control channel mobility measurements result's of adjacent/base station of cover overlapping accuracy, and measure the promptness that reports; And can guarantee user's service continuity preferably, and avoid neighboring interval meaningless on/downstream data channel disturbs; Owing to introduce based on common frequency measurement and carry out the mechanism that alien frequencies switches, can avoid the consumption of meaningless different-frequency measure to UE power.

Further, above-mentioned alien frequencies handover scheme possesses good backwards compatibility, also can switch smoothly and work without any need for changing under the heterogeneous network scene as the UE of LTE Rel-8/Rel-9 version.

One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of the foregoing description is to instruct relevant hardware to finish by program, this program can be stored in the computer-readable recording medium, and storage medium can comprise: read-only memory, random asccess memory, disk or CD etc.

More than to heterogeneous network method for handover control and signaling method and equipment and communication system that the embodiment of the invention provided, be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, to sum up, this description should not be construed as limitation of the present invention.

Claims

1. a physical control channel signaling method is characterized in that, comprising:

2. method according to claim 1 is characterized in that,

Described physical control channel at the second class carrier wave sends CRS, comprising:

Whole frequency at the physical control channel of the second class carrier wave sends CRS; Or,

Centre frequency 1.25MHz at the physical control channel of the second class carrier wave sends CRS.

3. a heterogeneous network method for handover control is characterized in that, comprising:

4. method according to claim 3 is characterized in that,

Describedly carry out the alien frequencies switch decision, comprising according to described common frequency measurement information:

According to described common frequency measurement information, estimate that with reference to common frequency measurement the error deviation value of alien frequencies channel conditions is carried out the alien frequencies switch decision.

5. method according to claim 4 is characterized in that,

Carry out the alien frequencies switch decision according to described common frequency measurement information, comprising:

For being better than Serving cell, the neighbor cell quality surpasses setting threshold at the reported event of determining described UE common frequency measurement, and the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches; Or,

Be worse than threshold value 1 for the Serving cell quality and the neighbor cell quality is better than threshold value 2 at the reported event of determining described UE common frequency measurement, and the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches; Or,

Be better than setting threshold at the reported event of determining described UE common frequency measurement for the neighbor cell quality; And the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches.

6. according to each described method of claim 3 to 5, it is characterized in that,

If the result of alien frequencies switch decision does not satisfy based on common frequency measurement to carry out the condition that alien frequencies switches, then carry out the different-frequency measure configuration for described UE.

7. method according to claim 4 is characterized in that, described method also comprises:

Control UE carries out a plurality of different-frequency measures and reporting measurement result;

According to the measurement result that described UE reports, determine or adjust the error deviation value of common frequency measurement estimation alien frequencies channel conditions.

8. method according to claim 4 is characterized in that, described method also comprises:

Behind the alien frequencies handoff failure based on common frequency measurement, statistics is carried out the performance parameter of alien frequencies handoff failure based on common frequency measurement, and adjusts the error deviation value of common frequency measurement estimation alien frequencies channel conditions with reference to this performance parameter;

Wherein, described performance parameter comprises:

Switch too early the Radio Link Failure that causes or ping-pong probability, cross the probability of the probability that switches the Radio Link Failure that causes evening, frequent handover operation that unreasonable switching causes.

9. a communication system is characterized in that, comprising:

10. a base station is characterized in that, comprising:

11. base station according to claim 10 is characterized in that,

Described judging module specifically is used for, and according to described common frequency measurement information, estimates that with reference to common frequency measurement the error deviation value of alien frequencies channel conditions is carried out the alien frequencies switch decision.

12. base station according to claim 11 is characterized in that,

Described judging module comprises, comprising:

The first judgement submodule, be used for surpassing setting threshold for the neighbor cell quality is better than Serving cell at the reported event of determining described UE common frequency measurement, and the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches; Or,

The second judgement submodule, be used for being worse than threshold value 1 for the Serving cell quality and the neighbor cell quality is better than threshold value 2 at the reported event of determining described UE common frequency measurement, and the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches; Or,

The 3rd judgement submodule is used for being better than setting threshold at the reported event of determining described UE common frequency measurement for the neighbor cell quality; And the error that common frequency measurement is estimated the alien frequencies channel conditions is in the scope of error deviation value the time, and the judgement alien frequencies switches to satisfy based on common frequency measurement carries out the condition that alien frequencies switches.

13. according to each described base station of claim 10 to 12, it is characterized in that, also comprise:

Trigger module is used for when the condition of switching based on common frequency measurement execution alien frequencies is not satisfied in the switching of described judging module judgement alien frequencies, for described UE carries out the different-frequency measure configuration.

14. base station according to claim 11 is characterized in that, also comprises:

First adjusting module is used for the measurement result that reports according to described UE, determines or adjusts the error deviation value that common frequency measurement is estimated the alien frequencies channel conditions.

15. base station according to claim 11 is characterized in that, also comprises:

Second adjusting module is used for behind the alien frequencies handoff failure based on common frequency measurement, and statistics is carried out the performance parameter of alien frequencies handoff failure based on common frequency measurement, and adjusts the error deviation value of common frequency measurement estimation alien frequencies channel conditions with reference to described performance parameter;

Wherein, described performance parameter comprises:

16. a communication system is characterized in that, comprising:

Each described base station of claim 10 to 15.